Download Negotiated Customer Connection Contract

Version 4
28.10.2011
Negotiated Customer
Connection Contract
(without construction, with
generator embedded within
customer network)
Energex Limited (Energex)
The University of Queensland (Customer)
WR5885208 – The University of Queensland
Gatton
Table of Contents7HFKQLFDO6FKHGXOHV2QO\
Schedule 4) - Connection Point
33 Schedule 5) - Operating Protocol
35 Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
Page i
Schedule 9 (a) – Technical Requirements for Inverter Connected Solar PV Generating System
59 Schedule 9 (b) – Technical Requirements for Standby Diesel Generator
74 Schedule 10) – Special Conditions
79 Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
Page ii
Schedule 4) - Connection Point
Part 1 - Connection Point
Refer to Attachments to this contract for Customer’s Single Line Schematic and Protection Diagrams and
other Technical Data
Part 2 - Network Elements
Connection Points:
Customer side terminals of 11kV metering units MU2 and MU3
Non-contributed Connection Assets:
(i.e. funded by Energex).
11kV network between:


connection point at MU2 to 11kV pole at switch X6000-B
connection point at MU3 to 11kV pole at switch X2412-D
Contributed Connection Assets:
(i.e. funded by Customer)

Microwave radio link between Energex substation SSGTN
and Customer substation SSUQG
Protection signalling scheme between SSGTN 11kV circuit
breaker CB1052 and SSUQG 11kV generating system circuit
breakers
Remote Control and Monitoring (SCADA) facilities at
SSUQG


Customer owned assets:

Concrete pole at SSUQG to mount radio telecommunication
facilities including antenna
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 33
Part 3 – N-1 Reliability Applies (refer clause 9.7(b))
No.
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 34
Schedule 5) - Operating Protocol
1.
2.
Energex and the Customer agree that the purpose of this Operating Protocol is to ensure:
(a)
compliance with all Laws;
(b)
the personal safety of the representatives of Energex and the Customer;
(c)
the personal safety of the general public; and
(d)
satisfactory operation of the Premises and the supply network.
Energex's contact for the day-to-day management of operational matters, including planned and
unplanned outages is:
Title:
Address:
Telephone:
Facsimile:
Email:
Alternate:
Title:
Address:
Telephone:
Facsimile:
Email:
3.
The Customer's contact for the day-to-day management of operational matters, including planned
and unplanned outages is:
Title:
Address:
Telephone:
Facsimile:
Email:
Alternate:
Title:
Address:
Telephone:
Facsimile:
Email:
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 35
4.
The parties agree that:
(a)
each year, they will determine a plan for outages/maintenance for the next 12 months;
(b)
minimum periods to notify of commencement of planned outages shall be two (2)
business days in advance;
(c)
each is obliged to notify the other of unplanned outages as soon as reasonably practicable;
(d)
the following shall be the order of priority for methods of providing notification:
(i)
Emergency:
Telephone or Mobile Telephone to 1st Contact Officer
Telephone or Mobile Telephone to Alternate Contact Officer
(ii)
Other:
Telephone or Mobile Telephone to 1st Contact Officer
Email to 1st Contact Officer
Write to 1st Contact Officer
Facsimile to 1st Contact Officer
(e)
In accordance with Technical Requirements (Schedule 9 of this contract) they will
establish and maintain operating limits for managing voltage on the high voltage network
and at the customer’s connection point. These limits may be reviewed periodically. Upon
commencement of this contract, the limits will be:
(i)
Energex will set the upstream 11kV step voltage regulator to maintain voltage at
connection point MU3 to 0.9875 ±0.0125 per unit.
(ii)
Steady state voltage at connection point MU3 does not exceed a maximum
allowable upper limit of 1.01 per unit
(f)
they will work together, and keep each other informed of their plans to rectify any
systemic problems which cause repeated momentary outages or voltage fluctuations.
(g)
The customer’s generating system shall only be permitted to operate in parallel with
Energex network when the Energex network is normal i.e. Customer supplied via
connection point MU3 (Lawes Siding) with switch open at connection point MU2.
(h)
In a network contingency event affecting the network supplying the customer, Energex
may request that the customer shut down the generating system or reduce output to ensure
that the network can continue to operate in a safe and reliable manner to meet Energex’s
regulatory obligations. Network contingency events include (but not limited to) outages or
faults on a section of 11kV feeder, failure of critical plant on the feeder such as a voltage
regulator, and re-configuration of the 11kV network to maintain supply to the network
while repairs are carried out.
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 36
Schedule 9 (a) – Technical Requirements for
Inverter Connected Solar PV Generating
System
The Technical Requirements are applicable to the Generating System and the Premises the subject of this
contract.
Technical Requirements have been developed for the safety of Energex's and the Customer’s operators
and assets under normal operating conditions or contingency events and to ensure operation of the
Generating System in parallel with Energex's Supply Network without interference to the continuity and
quality of supply to Energex's other customers.
The Customer must ensure that specifications of the Generating System are detailed in the Generating
System Specification Schedule attached to this contract.
1. Definitions and Interpretation
(a)
In this Schedule:
(i)
words and expressions used in this Schedule which are defined in the National Electricity
Rules shall have the same meanings as are respectively assigned to them in the National
Electricity Rules;
(ii)
references to sections, Chapters and provisions are references to the respective sections,
Chapters and provisions of the National Electricity Rules, unless otherwise indicated.
2. Requirement to provide information
(a)
Before the Customer connects any new or additional equipment to the Energex network, the
Customer must submit the following information to Energex:
(i)
a single line diagram with the protection details including protection settings;
(ii)
metering system design details for any metering equipment being provided by the
Customer;
(iii)
a general arrangement locating all the equipment on the site;
(iv)
a general arrangement for each new or altered substation showing all exits and the
position of all electrical equipment;
(v)
earthing details;
(vi)
the proposed methods of earthing cables and other equipment to comply with the
regulations of Queensland;
(vii) plant and earth grid test certificates from approved test authorities;
(viii) a secondary injection and trip test certificate on all circuit breakers and their
associated protection devices;
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 59
3.
(ix)
certification that all new equipment has been inspected before being connected to
the supply; and
(x)
operational arrangements.
(xi)
number of, nameplate rating, rated voltage, type and operating regime for any
embedded generation that is intended to be synchronised and operate in parallel
with the Energex network.
Customer Performance Standards
3.1 Protection systems and settings
(a)
The Customer must ensure that all connections to the Energex network are protected by
protection devices which effectively and safely disconnect any faulty circuit or plant item
automatically within a time period specified by Energex in accordance with the relevant
performance standard outlined in clause 3.1(b).
(b)
The performance standard relevant to this clause 3.1 is the automatic access standard being the
following:
(i)
The fault clearance time of a primary protection system for a short circuit fault of
any fault type anywhere:
(A)
Within a substation
(B)
Within connected plant; or
(C)
On at least the half of a power line nearer to the protection system,
shall not exceed the relevant time in column 2 of Table 1 for the nominal voltage
that applies at the fault location.
(ii)
The fault clearance time of a primary protection system for a short circuit fault of
any fault type anywhere on the remote portion of a power line for which the near
portion is protected by a primary protection system under clause 3.1(b)(i) must not
exceed the relevant time in column 3 of Table 1.
(iii)
Backup protection systems must be provided to clear faults that are not cleared by
the circuit breakers controlled by the primary protection system, within the
applicable fault clearance time set out in column 4 of Table 1.
(iv)
Each primary protection system must have sufficient redundancy to ensure that a
faulted element within its protection zone is disconnected from the power system
within the applicable fault clearance time with any single protection element
(including any communications facility upon which that protection system
depends) out of service.
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 60
Table 1
Nominal Voltage at
Fault Location (kV)
Time (milliseconds)
Column 1
Column 2
Column 3
Column 4
More than 1kV but
1000
1000
2000
less than 30kV
3.2
Power factor requirements
(a)
If a Customer installs shunt capacitors to comply with power factor requirements it must
comply with Energex’s reasonable requirements to ensure that the design does not
severely attenuate audio frequency signals used for load control or operations, or
adversely impact on harmonic voltage levels at the connection point (eg use of detuning
reactors).
(b)
(i)
Pursuant to clause 36(2)(d ii) of the Electricity Regulation, Energex requires
the Customer to ensure that the power factors at the connection point for the
Inverter System (CB1152 off Customer Substation SSUQG) and the load
(complete with minor PV) are separately maintained to between at least 0.90
lagging to 0.90 leading for the Inverter System and 0.9 lagging to 0.9 leading for
the load at all times relevant to the connection points MU3 (normal supply) and
MU2 (back-up supply) excluding the conditions of 3.2(b)(ii).
(ii)
3.3
For load less than 30 percent of the maximum demand at the connection point,
Energex may accept a power factor outside the range stipulated above provided
the requirements of Clause 5.3.6 are met.
Balancing of load currents
3.3.1
Energex requires a connected Customer's load to be balanced across all phases in order to
maintain the negative sequence voltage at each connection point at less than or equal to
the limits of the system standards for the applicable nominal supply voltage level, being
as set out in the following table:
Nominal supply
voltage (kV)
Column 1
more than 10
but not more
than 100
Maximum negative sequence voltage (% of nominal voltage)
Column 2
Column 3
Column 4
Column 5
no contingency
event
credible
contingency
event
General
once per hour
30 minute
average
30 minute
average
10 minute
average
1 minute
average
1.3
1.3
2.0
2.5
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 61
3.3.2 The Customer must ensure that it meets the performance standard being the current in any
phase is not greater than 105 percent or less than 95 percent of the average of the currents
in the three phases;
3.3.3 The limit to load current unbalance is subject to verification of compliance by Energex.
3.4
Voltage fluctuations
The Customer must ensure that that the voltage fluctuations caused by variations in loading
level at the connection point, including those arising from energisation, de-energisation or
other operation of the plant must not exceed the automatic access standard being the
emission limits (as determined in accordance with S5.1.5(a) of the Rules) at the Customer’s
connection point as follows:
Short and long term flicker emission limits
Individual Short Term Emission
Limit
Individual Long Term Emission
Limit
EPsti
EPlti
0.35
0.25
Rapid Voltage Changes Emission Limits (Starting Condition) are given in the following
table:
The maximum voltage change ΔU/UN for normal operating conditions is expressed in
percent of the actual voltage in the table below. A Customer may cause voltage changes,
depending on the repetition frequency of these changes. Where ΔU is steady state
voltage Change and UN is Steady state voltage.
Emission Limits for voltage changes in function
of the number of changes per hour, r
∆Udyn / UN(%)
Repetition frequency
MV
r (hour-1)
(11/33kV)
r ≤1
4
1 < r ≤ 10
3
10 < r ≤ 100
2
100 < r ≤ 1000
1.25
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 62
3.5
Harmonics and voltage notching
3.5.1 The Customer must ensure that the harmonic voltage distortion caused by non-linearity,
commutation of power electronic equipment, harmonic resonance and other effects within
the plant, must not exceed the THDv limits set out in Table 3 (determined in accordance
with Rule S5.1.6(a)). Minor exceedances of individual harmonics will be accepted
provided the THDv limits are not exceeded.
Table 3 - Customer's Emission Limit
Harmonic order h
Voltage Level (All values in percent)
Customer’s Emission Limit
2
0.10
3
0.35
4
0.10
5
1.03
6
0.10
7
0.79
8
0.10
9
0.20
10
0.10
11
1.11
12
0.10
13
0.83
14
0.10
15
0.10
16
0.10
17
0.51
18
0.10
19
0.40
20
0.10
21
0.10
22
0.10
23
0.42
24
0.10
25
0.25
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 63
Harmonic order h
Voltage Level (All values in percent)
Customer’s Emission Limit
26
0.10
27
0.10
28
0.10
29
0.22
30
0.10
31
0.21
32
0.10
33
0.10
34
0.10
35
0.19
36
0.10
37
0.18
38
0.10
39
0.10
40
0.10
Total Harmonic
Distortion (THDv)
1.33
*Note: The THDv is determined as 130% of the 5th harmonic limit as per AS61000.3.6
Appendix D.
3.5.2 The harmonic voltage distortion emission limits are subject to verification of compliance
by Energex. The compliance assessment will take into account emission levels of THDv
and individual harmonic orders for verification.
4.
Customer Technical Conditions
4.1 Design Standards
The Customer must ensure that:
4.1.1 the electrical plant in its facility complies with the relevant Australian Standards as
applicable at the time of first installation of that electrical plant in the facility;
4.1.2 circuit breakers provided to isolate the Customer’s facilities from Energex’s facilities are
capable of breaking, without damage or restrike, fault currents nominated by Energex in
this Schedule; and
4.1.3 new equipment including circuit-breakers provided to isolate the Customer’s facilities from
Energex’s facilities is capable of withstanding, without damage, power frequency
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 64
voltages and impulse levels nominated by Energex to apply at the connection point in
accordance with the relevant provisions of the system standards and recorded in this
Schedule.
4.2 Settings of protection and control systems
4.2.1
The Customer must only apply settings to a control system or a protection system that are
necessary to comply with performance requirements of this Schedule if the settings have
been approved in writing by Energex. The Customer must not allow its plant to take
supply of electricity from the power system without such prior approval.
4.2.2
If the Customer seeks approval from Energex to apply or change a setting, approval must
not be withheld by Energex, unless that the changed setting would cause the plant to not
comply with the relevant performance standard (as outlined in clause 3.1(b) of this
Schedule).
4.2.3
Energex acknowledges that the Gatton site is a research facility aimed in part at
improving network performance and will inherently involve regular alteration of the
control system or portions thereof. Where a series of control system adjustments are
requested, Energex shall consider such requests as a single request.
4.2.4
If Energex reasonably determines that a setting of a control system or protection system
of the plant needs to change to comply with the relevant performance standard (as
outlined in clause 3.1(b) of this Schedule). Energex must consult with the Customer, and
Energex may request in writing that a setting be applied in accordance with the
determination. Energex may also request a test to verify the performance of the relevant
plant with the new setting.
4.2.5
The Customer who receives such a request must arrange for the notified setting to be
applied as requested and for a test to be conducted as requested. After the test, the
Customer must, on request, provide Energex with a report of a requested test, including
evidence of its success or failure. Such a report of a test is confidential information.
4.2.6
The Customer must not change a setting requested by Energex without its prior written
agreement. If Energex requires the Customer to change a setting within 18 months of a
previous request, Energex must pay the Customer its reasonable costs of changing the
setting and conducting the tests as requested.
4.3 Design requirements for Network Users' substations
The Customer must comply with the following requirements applicable to the design, station
layout and choice of equipment for a substation:
4.3.1
safety provisions must comply with requirements applicable to Queensland notified by
Energex;
4.3.2
appropriate interfaces and accommodation must be incorporated for telecommunication,
protection, control and remote monitoring facilities between Energex and the Generator.
This includes facilities for a protection signalling scheme between Energex network and
the generating system, remote monitoring of the status of the customer’s main incomer
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 65
and generator circuit breakers, Voltage, Real and Reactive power magnitudes and
directions at the connection point.
4.3.3
a substation must be capable of continuous uninterrupted operation with the levels of
voltage, harmonics, unbalance and voltage fluctuation specified in the system standards
as modified in accordance with the relevant provisions of this Schedule.
4.3.4
earthing of primary plant in the substation must be in accordance with the Electricity
Supply Association of Australia Safe Earthing Guide and must reduce step and touch
potentials to safe levels;
4.3.5
synchronisation facilities or reclose blocking must be provided if a generating unit is
connected through the substation;
5.
4.3.6
secure electricity supplies of adequate capacity must be provided for plant performing
communication, monitoring, control and protection functions;
4.3.7
plant must be tested to ensure that the substation complies with the approved design and
specifications as included in this contract;
4.3.8
the protection equipment required would normally include protection schemes for
individual items of plant, back-up arrangements, auxiliary DC supplies and
instrumentation transformers; and
4.3.9
insulation levels of plant in the substation must co-ordinate with the insulation levels of
the Energex network to which the substation is connected as nominated in the
connection agreement.
Conditions for Connection of Generating System
5.1 Requirement to provide information
a) The Generator must provide to Energex the following information about the control
systems of the generating system:
(A)
a set of functional block diagrams, including all functions between
feedback and generating system output;
(B)
parameters of each functional block, including all settings and limits.
b) The Generator must provide the system information:
(i) within 3 months after commissioning tests or other tests undertaken are
completed;
(ii) when the Generator becomes aware that the information is incomplete,
inaccurate or out of date; or
(iii) on request by Energex, where Energex considers that the information in
incomplete, inaccurate or out of date.
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 66
5.2 Technical matters to be coordinated
a) The Generator and Energex must use all reasonable endeavours to agree upon
relevant technical matters in respect of each new or altered connection of the
generating system to the Energex network including:
(i)
design at the connection point;
(ii)
physical layout adjacent to the connection point;
(iii)
primary protection and backup protection;
(iv)
control characteristics;
(v)
communications facilities;
(vi)
lightning protection;
(vii)
fault levels and fault clearance;
(viii)
switching and isolation facilities;
(ix)
interlocking and synchronising arrangements; and
b) The Generator must ensure that in designing the generating system’s electrical plant,
including any substation for the connection of the generating system to the Energex
network, to operate at the same nominal voltage as at the connection point:
(i)
the plant complies with the relevant Australian Standards unless a
provision of the Electricity Regulation requires otherwise;
(ii)
the earthing of the plant complies with the ENA EG1-2006:
Substation Earthing Guide to reduce step and touch potentials to
safe levels;
(iii)
DC functional earthing of the plant complies with the Part 11 of
Electricity Safety Regulation.
c) If no relevant Australian Standard exists for the purposes of sub-paragraph (i), the
Generator must agree with Energex for the Generator to comply with another
relevant standard.
5.3 Technical requirements
5.3.1
Quality of electricity generated
a) For the purposes of this clause, if the Generator's generating system is an
asynchronous generating unit (Inverter System), the Inverter units shall provide
passive and active anti-islanding protection in accordance with Australian or
international standards. The Generating system shall be installed in accordance
with acceptable Australian or international standards and good engineering
practices.
b) When generating and when not generating, the Generator's generating system
must not produce at any of its connection points for generation:
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 67
(i)
voltage fluctuation greater than the limits allocated by Energex
under clause 3.4 ;
(ii)
harmonic voltage distortion greater than the emission limits
specified or allocated by Energex under clause 3.5; and
(iii)
5.3.2
voltage unbalance greater than the limits allocated by Energex in
accordance with clause 3.3
Operating frequency range of Generating unit
a) For the purposes of this clause, the generating system and each of its
generating units must be capable of continuous uninterrupted operation for
the frequency band specified below:
Band
Normal
operating
frequency
Operational
frequency
tolerance
Condition
Table 2: Frequency band
Containment
Period
No contingency event
or load event
49.5 to 50.5 Hz
Continuous operation for an
indefinite period
Generation event, load
event or network event
48 to 52 Hz
Outside the limits Disconnection time 2 secs
Within the limits Reconnection time 60-90 secs
5.3.3
Operating voltage range of Generating system
a) The Generator's generating system and each of its generating units must be
capable of continuous uninterrupted operation where a power system
disturbance causes the voltage at the connection point to vary within the
range of 90% to 100% of normal voltage continuously.
5.3.4
Protection of generating systems from distribution network disturbances
a) Generator's generating system or any of its generating units is required by
the Generator or Energex to be automatically disconnected from the
distribution network in response to abnormal conditions(e.g. fault conditions)
arising from the network;
b) Energex require the generating system to be automatically disconnected by a
local or remote control scheme whenever the part of the network to which it
is connected has been disconnected from the national grid, forming an
island that supplies a Customer.
c) The Generator's generating system may be automatically disconnected from
the distribution network under any of the following conditions:
(i)
in accordance with an ancillary services agreement between the
Generator and Energex (e.g. loss of communication and loss of
supply to communication equipment);
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 68
(ii)
where the load and the generating system has the same
connection point forming an island;
(iii)
where the generating system is automatically disconnected under
paragraph a);
(iv)
where the Generator's generating system is automatically
disconnected under clause (a) due to a failure of the generating
plant.
Energex is not liable for any loss or damage incurred by the Generator or any other
person as a consequence of a fault on either the distribution network, or within the
Generator’s facility.
5.3.5
Protection Systems that impact on distribution network
a)
For the purpose this clauses, primary protection systems must be provided to
disconnect from the power system any faulted element in a generating
system and in protection zones that include the connection point within the
applicable fault clearance time determined under Clause 3.1 of this
Schedule;
b)
Each primary protection system must have sufficient redundancy to ensure
that a faulted element within its protection zone is disconnected from the
power system within the applicable fault clearance time with any single
protection element (including any communications facility upon which that
protection system depends) out of service; and
c)
Backup protection systems must be provided to clear faults that are not
cleared by the circuit breakers controlled by the primary protection system
within the applicable fault clearance time determined under clause 3.1 of
this Schedule.
d)
Energex and the Generator must cooperate in the design and implementation
of protection systems to comply with this clause , including cooperation on:
(i) the use of current transformer and voltage transformer secondary
circuits (or equivalent) of one party by the protection system of the other;
(ii) tripping of one party's circuit breakers by a protection system of the other
party; and
(iii) co-ordination of protection system settings to ensure inter-operation.
e)
The protection system design must:
(i)
include primary and back-up anti-islanding protection systems at
the connection point incorporating functions as necessary to
isolate the Generating System from the Supply Network in the
event of a Supply Network fault or failure. Protection schemes
shall include the following:
Negotiated Customer Connection Contract (without Construction; with generator embedded within customer network)
The technical requirements and other conditions described in this document while typical cannot be applied as a standard arrangement.
Connection applications will be individually assessed by Energex and actual requirements, terms and conditions determined accordingly.
Page 69
(A)
An inter-trip protection scheme;
(B)
Neutral Voltage Displacement;
(C)
Overcurrent and earth fault protection;
(D)
Under/over Voltage protection;
(E)
Under/over Frequency protection;
(ii)
be coordinated with other protection systems;
(iii)
avoid consequential disconnection of other Network Users’
facilities; and
(iv)
f)
take into account existing obligations of Energex under connection
agreements with other Network Users.
The Generator must ensure that equipment constituting its protection system
relating to the Connection Point is subjected to comprehensive periodic
testing within the following intervals:
(i) systems containing only protection relays or modules or protection
functionality, which are supervised, must be tested at intervals not
exceeding 48 months.
(ii) systems containing any protection relays or modules or protection
functionality, which are NOT supervised, must be tested at intervals not
exceeding 36 months.
g)
The Generator must ensure that all of its protection settings are coordinated
with Energex's protection systems and must submit a copy of a single line
diagram and information on proposed protection systems at the connection
point to Energex. Energex must review and approve these proposals prior
to installation.
5.3.6 Voltage management and reactive power support
a)
For the purpose of this clause, Energex may require that the design and
operation of the control systems of a generating unit or generating system
be coordinated with the existing voltage control systems of Energex and
of other Network Users, in order to avoid or manage interactions that would
adversely impact on Energex and other Network Users. Any such
requirements imposed by Energex must be recorded in the Schedule.
b)
Asynchronous generating units (Inverter units) must be capable of
supplying and absorbing continuously at its connection point an amount of
reactive power of at least the amount equal to the product of the active
power of the asynchronous generating unit and approximately 0.395 for
active power levels above 30% of its rating.
c)
The Generator's generating system must have plant capabilities and
control systems sufficient to ensure that operation of the generating
system does not cause instability (including hunting of tap-changing
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Page 70
transformer control systems) that would adversely impact other Network
Users;
d)
a control system must have for the purpose of disturbance monitoring and
testing, permanently installed and operational, monitoring and recording
facilities for key variables including each input and output.
e)
A Generator's generating system comprised of asynchronous generating
units (Inverter units), must have a control system that:
(i)
regulates voltage, power factor, active power or reactive power at
the connection point MU3 dynamically in a manner that maintains
the steady state voltage below a maximum upper limit that is
coordinated with Energex with the intent of:
a. ensuring that Energex meets its regulatory obligations to
maintain supply to other customers within allowable limits for
voltage and other regulatory obligations pertaining to safety and
reliability of the network; and
b. allowing the customer to maximise power export to the grid from
the generating system
(ii)
f)
has a settling time less than 7.5 seconds for a 5% voltage
disturbance with the generating unit electrically connected to the
distribution network from an operating point where such a voltage
disturbance would not cause any limiting device to operate.
The operating limits at the connection point MU3 will be documented in the
Operating Protocol (refer Schedule 5 of this contract) and may be periodically
reviewed.
5.3.7 Monitoring and control requirements
5.3.7.1 Remote Monitoring
The Generator's must have remote monitoring equipment to transmit to Energex's
control centre in real time the quantities that Energex reasonably requires. The
quantities shall include voltage, current, power factor, Main CB status, Alarms at
the connection point, MW, MVar, Generator CB status at the generator’s
connection point.
5.3.7.2 Communications equipment
The Generator must:
(i)
provide and maintain a telephone facility for the purposes of
operational communications between the Generator's responsible
operator notified to Energex’s control centre; and
(ii)
provide electricity supplies for remote monitoring equipment and
remote communication equipment installed in relation to its
generating system capable of keeping such equipment available for
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Page 71
at least 1 hour following total loss of supply at the connection
point for the relevant generating unit.
5.3.8 Fault current
(a)
The contribution of the Generator's generating system to the fault current on the
connecting network through its connection point must not exceed the
contribution level that will ensure that the total fault current can be safely
interrupted by the circuit breakers of the connecting network and safely carried
by the connecting network for the duration of the applicable backup protection
system fault clearance times, as specified for the relevant connection point by
Energex;
(b)
A generating system’s connected plant must be capable of withstanding fault
current through the connection point up to the higher of:
(i) [1.3kA]; and
(ii) the highest level of current at the connection point that can be safely
interrupted by the circuit breakers of the connecting network and safely
carried by the connecting network for the duration of the applicable
breaker fail protection system fault clearance times, as specified by
Energex (Energex to complete); and
(c)
a circuit breaker provided to isolate a generating unit or generating system from
the network must be capable of breaking, without damage or restrike, the
maximum fault currents that could reasonably be expected to flow through the
circuit breaker for any fault in the network or in the generating unit or
generating system, as specified in the connection agreement.
5.3.9 Application of Settings - Protection and Control Systems
a) The Generator must only apply settings to a control system or a protection
system that are necessary to comply with performance requirements of this
Schedule if the settings have been approved in writing by Energex. The
Generator must not allow its generating unit to connect to the distribution
network without such prior approval.
b) If the Generator seeks approval from Energex to apply or change a setting,
approval must not be withheld unless Energex reasonably determines that
the changed setting would cause the generating unit to not comply with
the relevant performance standard.
c) Energex acknowledges that the Gatton site is a research facility aimed in
part at improving network performance and will inherently involve regular
alteration of the control system or portions thereof. Where a series of
control system adjustments are requested, Energex shall consider such
requests as a single request.
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Page 72
d) Energex must consult with the Generator and may request in writing that a
setting be applied in accordance with a determination made in
circumstances where Energex reasonably determines that a setting of a
control system or protection system of the generating unit needs to change
to comply with the relevant performance standard. Energex may also
request a test to verify the performance of the relevant plant with the new
setting.
e) If Energex issues a request contemplated by paragraph d) to the Generator,
the Generator must arrange for the notified setting to be applied as
requested and for a test to be conducted as requested. After the test, the
Generator must, on request, provide Energex with a report of a requested
test, including evidence of its success or failure. Such a report is
confidential information.
f) The Generator must not change a setting requested by Energex without its
prior written agreement. If Energex requires the Generator to change a
setting within 18 months of a previous request, Energex must pay the
Generator its reasonable costs of changing the setting and conducting the
tests as requested.
5.3.10 Inspection, Testing and Commissioning of Generating System
The Customer must ensure that the Generating System and any subsequent
significant modification to the Generating System is inspected and tested to
demonstrate compliance with this contract.
Energex will witness such inspections, tests and commissioning of generating
system.
The Customer must ensure that commissioning is conducted under the supervision
of a registered professional engineer under the Professional Engineers Act 2002
(Qld) who is registered in the area of electrical engineering, and that the engineer
provides to Energex, as soon as practicable after commissioning, a certification that
the Generating System complies with the technical requirements set out in this
contract.
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Page 73
Schedule 9 (b) – Technical Requirements for
Standby Diesel Generator
1
2
3
Scope
(a)
These Technical Requirements are applicable to the diesel Generating System and the
Premises the subject of this contract.
(b)
The Technical Requirements have been developed for the safety of Energex's and the
Customer’s operators and assets under normal operating conditions and to ensure
operation of the Generating System in parallel with Energex's Supply Network without
interference to the continuity and quality of supply to Energex's other customers.
Connection
(a)
These Technical Requirements provide for the connection of the Customer’s Premises
(including the Generating System) to the Supply Network at the Connection Point.
Unless otherwise agreed between the parties, the Connection Point is the only point at
which the Premises may be connected to the Supply Network.
(b)
The Customer must not add generating units, or make modifications, to the Generating
System which impact on the Supply Network or the ability to perform obligations under
this contract, without prior written agreement from Energex.
Supply Network Environment
The Customer must ensure that the Generating System and other systems and facilities at the
Premises operate satisfactorily:
4
(a)
for the full range of variation of system parameters and characteristics; and
(b)
within the distortions and disturbances specified in this Schedule.
Generating System Design and Construction
The Customer must ensure that:
(a)
The specifications of the Generating System are detailed in the Generating System
Specification Schedule attached to this contract.
(b)
All Generating System and associated equipment, including earth grid and earthing
connections, is designed and constructed to conform to the requirements of this contract,
all relevant Laws, AS/NZS3000, and Australian, International or British Standards
relevant to the installed equipment and Good Electricity Industry Practice.
(c)
(d)
Each generating unit must be capable of safe and satisfactory operation in parallel with
the Supply Network and be capable of effective and swift disconnection from the Supply
Network upon the occurrence of:
(i)
a generating unit fault; or
(ii)
supply network fault.
Synchronous generators must be fitted with either automatic or operator-controlled
equipment which ensures that frequencies, voltage, phase angle and phase sequences are
identical to the Supply Network parameters before connection is made between Energex's
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Page 74
Supply Network and the Generating System. To ensure control over real and reactive
power contribution to the Supply Network, adequate control must be provided over both
the governor (regulating frequency and input motive power to the rotor) and the
excitation system (controlling output voltage level).
5
Generating System Operations
5.1
General Standard
The Customer must ensure that the Generating System is maintained and operated in accordance
with Good Electricity Industry Practice and relevant Laws, in consideration of the Generating
System supplier's recommendations and in accordance with the operational limits imposed by
Energex in this Schedule.
5.2
Operating Procedures
(a)
5.3
6
Comply with the Operating Procedures detailed in the attached Operating Procedures
Schedule.
(b)
If operation of the Generating System would materially impact on the Energex Supply
Network, taking into account Good Electricity Industry Practice, then the parties must
develop further Operating Procedures. In the event that the parties do not agree, then the
Operating Procedures will be those reasonably determined by Energex.
( c)
The onus of ensuring that these Operating Procedures are adhered to and the training of
staff rests with the Customer. Any change to the operating procedures in the Operating
Procedures Schedule attached to this contract must be agreed to by both parties and
documented.
Operation During and Following Supply Network Outages
(a)
An island external to the Customer’s Connection Point supplied from the Customer must
not be created during any outage on the Supply Network.
(b)
For the situation where the Generating System has disconnected from the connection
point and shut down and the supply from the network is or becomes available at the
connection point then the procedure for Generating System reconnection will be as
follows. The Customer must wait for a sufficient period (five minutes) following
restoration of supply following a Supply Network outage before attempting to synchronise
with and re-connect to the Supply Network. An automatic interlock must be provided to
ensure this delay occurs.
(c)
For the situation where the Generating System has disconnected from the connection
point and is operating with load as an island contained within the Premises, and the
supply from the network is or becomes available at the connection point, then the
procedure for Generating System reconnection will be as follows. The Customer must
wait for a sufficient period (five minutes) following restoration of supply following a
Supply Network outage before attempting to synchronise with and re-connect to the
Supply Network. An automatic interlock must be provided to ensure this delay occurs.
Protection of the Generating System
The Customer must implement measures to safeguard against potential damage to the Generating
System and associated equipment or operational difficulties due to Supply Network-related
events, which include, but are not limited to, the following:
(a)
transient voltage sags during Supply Network faults;
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Page 75
7
(b)
transient voltage sags during Supply Network faults followed by fault isolation and then
successful unsynchronised auto re-closing onto the generator;
(c )
Supply Network instability and loss of synchronism;
(d)
interruption of the supply from Energex including auto-reclose and auto-changeover – the
Customer should check with Energex for auto-reclose and auto-changeover settings for
the particular location as these are subject to change. At the Premises, the present settings
for auto-reclose are one reclose attempt at 20 seconds);
(e)
high or low frequency;
(f)
high or low voltage;
(g)
load reduction (instantaneous loss of complete load) due to operation of Supply Network
switches;
(h)
lightning and switching surges;
(i)
step change in voltage due to upstream switching; and
(j)
phase unbalance or single phasing due to loss of one supply phase.
Interruption and withstand capacity
(a)
(b)
8
The Customer must ensure that the Customer’s switchgear has the appropriate minimum
short time interrupting and withstand capabilities for the combined fault current from
Energex's Supply Network and the Customer’s Generating System; and
Generating units connected to the Supply Network may not raise fault levels beyond the
capacity of Energex's interruption devices as documented in the Network Characteristics
attached to this contract. The Customer will be required to pay upon demand any costs
incurred by Energex with respect to fault level control measures attributable to
connection of the Generating System.
Earth grid
The Customer must establish an earth grid for the Premises and provide satisfactory earthing
independent of Energex's Supply Network in accordance with regulatory requirements.
9
Disturbance issues
9.1
General
(a)
The distortion, fluctuation and unbalance limits specified in clause 12.2 below are
specified for Supply Network intact operating conditions and must be assessed at the
Connection Point. The Customer should refer to the standards as follows:
(i)
AS/NZS 61000.3.6:2001 “Electromagnetic compatibility (EMC) – Assessment of
emission limits for distorting loads in MV and HV power systems (IEC 61000-36:1996, MOD)”.
(ii)
AS/NZS 61000.3.7:2001 “Electromagnetic compatibility (EMC) – Limits –
Assessment of emission limits for fluctuating loads in MV and HV power
systems (IEC 61000-3-7:1996, MOD)”.
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Page 76
Energex has adopted “planning levels” for its Supply Network as provided for in the
Australian Standard HB 264-2003 “Power Quality – Recommendations for the
application of AS/NZS 61000.3.7 and AS/NZS 61000.3.7.
9.2
(b)
Energex may undertake, or may reasonably require, a program of tests be performed at
the Customer’s cost, subject to paragraph (d) below, to ensure compliance with these
disturbance limits.
(c)
If such tests determine that the limits specified in this clause are exceeded and the noncompliance is due to the Generating System, then the Customer must take remedial
action at its own expense to reduce any disturbance caused by the Generating System to
less than the levels specified in this clause.
(d)
If the tests demonstrate compliance, or that the non-compliance is not caused by the
operation of the Generating System, then Energex must reimburse the Customer for the
reasonable expenses incurred by the Customer as a direct result of conducting the tests.
Limits
(a)
Voltage Fluctuations
Refer 3.4 of the Schedule 9a.
(b)
Unbalance
Refer 3.3 of the Schedule 9a.
(c)
Harmonics
Refer 3.5 of this Schedule 9a.
10
Protection for diesel generator
(a)
The Customer shall install anti-islanding protection systems incorporating functions as
necessary to isolate the Generating System from the Supply Network in the event of a
Supply Network fault or failure. The following protection schemes are suitable to
include:
(i)
Rate of Change of Frequency (ROCOF) protection;
(ii)
Negative sequence voltage or current;
(iii)
Overcurrent and earth fault protection;
(iv)
Under/Over Voltage protection;
(v)
Under/Over Frequency protection;
(b)
The Customer must be responsible for the design, installation, testing, operation and
maintenance of the Generating System protection and control systems.
(c)
The Customer must ensure that its Generating System protection systems are installed
and commissioned and maintained and tested in accordance with this Schedule and Good
Electricity Industry Practice.
(d)
The Customer must ensure that the Generating System protection systems will provide
complete automatic separation from the Supply Network, or shutdown, in the event of
any irregularity or failure on any phase of the supply, or for a fault on the Customer’s
plant or its associated circuits.
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Page 77
(e)
Failure of the Generating System to disconnect from the Supply Network upon loss of
synchronism or in the event of any irregularity or failure on any phase of the supply or
for a fault on the customer’s plant or its associated circuits will be deemed to be
unreasonable interference and a breach of the requirements of this Schedule.
(f)
No alterations to the protection and control equipment which impact on Energex's Supply
Network are to be performed without the written consent of Energex, which must not be
unreasonably withheld. If any changes other than relay settings are approved to be made,
then the whole of the affected scheme must be tested to demonstrate compliance with this
Schedule.
(g)
The Customer must ensure that all of its protection settings are coordinated with
Energex's protection systems.
(h)
The Customer must submit a copy of a single line diagram and information on proposed
protection systems at each site to Energex. Energex must review and approve these
proposals prior to installation.
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Page 78
Schedule 10) – Special Conditions
SC 1
Process if Generating System negatively impacts the supply network
SC1.1 Acknowledgement
The parties acknowledge that Energex’s agreement to provide connection services to the Customer
for the Generating System is reliant upon representations and information provided by the
Customer about the Generating System’s likely impact on other customers of the supply network.
SC1.2 Negative impact on another Customer’s Connection Point
(a) If Energex:
(i)
(ii)
receives a report from another customer; or
otherwise becomes aware of a situation;
where Energex, acting reasonably, believes that the operation of the generating system at the
Customer’s premises has caused, or is causing, voltage, voltage fluctuations, load balance or
harmonic emissions to exceed limits that Energex is obliged by law to maintain at another
customer’s connection point, then Energex will in consultation with the customer
investigate the exceedance and complete a report to determine the cause of the exceedance
and potential solutions to resolve this issue.
(b) If Energex’s investigation referred to in (a) determines that the Customer’s Generating
System is causing or significantly contributing to voltage, voltage fluctuations, load balance
or harmonic emissions to exceed limits that Energex is obliged by law to maintain at another
customer’s connection point then:
(i)
(ii)
(iii)
Energex will provide the Customer with a copy of the report created during its
investigation;
Energex will notify the Customer of Energex’s solution to alter the operation of the
Generating System to remedy the situation. Energex’s solution must be reasonable;
and
the Customer will implement Energex’s solution as set out at (ii) as soon as
practicable, but no later than 28 days after notification.
If Energex’s solution does not solve the power quality issues then the parties will repeat the
process in paragraph (b) until the power quality issues at the other customer’s Connection
Points are resolved.
(c) Once the Customer has implemented the solution suggested by Energex in paragraph (b),
Energex agrees to work with the Customer on alternative solutions suggested by the
Customer to alter the operation of the Generating System to ensure that it does not have a
negative impact on the power quality of other customers in the surrounding area.
SC1.3 Costs
Each party will bear its own costs in relation to the preparation of the report under SC1.2(a).
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Page 79