Download 3. Basic requirements for the Digital Protective Relay

Specification for Tender
840992135
General Specification for Digital
Protective Relay of MV Switchgear
This specification defines:
Requirements for the Manufacturer
Basic requirements for the Digital Protective Relay
Digital Protective Relay functional description
Tender documents
Testing, commissioning, maintenance requirements
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Specification for Tender
840992135
Table of contents:
1. General ………………………………………………………………………………….........
p. 3
2. Requirements for the manufacturer ………………………………………………………..
p. 3
2.1 Certifications……………………………………………………………………………........
p. 3
2.2 Experience………………………………………………………………………….…….......
p. 3
2.3 Local support…………………………………………………………………........................
p. 3
3. Basic requirements for the Digital Protective Relay……………………….........................
p. 4
3.1 General requirements …………………………………………………………………..........
p. 4 - 5
3.2 General Digital Protective Relay design requirements ……………………….......................
p. 5 - 6
3.3 Digital Protective Relay general and practical operating requirements…………..... ……….
p. 7
3.4 Digital Protective Relay installation rules and requirements ………………..........................
p. 7 - 8
4. Digital Protective Relay description ………………………………......................................
p. 8
4.1 Protection…………………………………………………….................................................
p. 8 - 9
4.2 Control and Monitoring…………………………………………………………...................
p. 9
4.3 Metering…………………………………………………………...........................................
p. 10
4.4 Network, Machine and Switch gear diagnosis……………………………………………....
p. 10 - 11
4.5 Relay diagnosis ………………………………………………...............................................
p. 12
4.6 Programming and configuration software …………………………………………...............
p. 12
4.7 User Machine Interface………………………………….......................................................
p. 13
4.8 Communication …………………………………………………………………...................
p. 13 - 14
4.9 Digital Protective Relay hardware architecture platform……………………………….......
p. 14
5. Tender documents ……………………………………………………………………...........
p. 14
6. Protection relay testing , commissioning and maintenance …………………………........
p. 14
6.1 Testing …………………………………………………………………………………….....
p. 14
6.2 Commissioning tests ………………………………………………….....................……......
p. 14 - 15
6.3 Maintenance…………………………………………………………....................................
p. 15
7. Annexes …………………………………………………………………………………….....
p. 16
7.1 Annex A1……………………………………………………………………………….….....
p. 16
7.2 Annex A2……………………………………………………….............................................
p. 17
7.3 Annex A3…………………………………………………………………..............................
p. 18
7.4 Annex A4………………………………………………………………….............................
p. 19
7.5 Annex A5…………………………………………………………………..............................
p. 20
7.6 Annex A6…………………………………………………………………..............................
p. 21
7.7 Annnex A7…………………………………………………………………............................
p. 22
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Specification for Tender
840992135
1. General
This part of the specification describes the general requirements for a Digital Protective Relay, to comply
with National, IEC, EN, CSA and NEMA standards and for use in the low voltage compartment of a
Medium Voltage switch gear cubicle or a in separate control panel.
It also defines Low, Mid and High-end solutions to protect the following Medium Voltage Low, Mid, High
power applications:
1.1 Substation (feeder or incomer type)
1.2 Transformer
1.3 Motor
1.4 Generator
1.5 Busbar
1.6 Capacitor bank
2. Requirements for the manufacturer
2.1 Certifications
The Digital Relay manufacturer shall have a valid ISO 9001 (2000 version) certification and an applicable
Quality Assurance and Quality Control system.
The Digital Relay manufacturer shall have the Environment Certification ISO 14001 and shall be able to
supply the Product Environmental Profile (P.E.P) on the engineer’s request.
2.2 Experience
The Digital relay manufacturer shall have a long term experience in designing and manufacturing Digital
Protective Relays and have relevant business volume and references in order to provide credibility in his
commitments and a long term support capability.
2.3 Local support
The manufacturer/supplier shall have a permanent representative office with a trained and skilled support
staff, in the country or in the region where the Digital Relays are delivered, in order to prove his
commitment for local or regional support and to provide a channel for communication.
The local or regional support team shall be easily reached and shall be able to arrive on site whenever
accessible within (x x) hour’s notice.
The engineers employed by the supplier’s local or regional office shall be certified by the manufacturer and
provide start-up service including physical inspection of the Digital Relay, connected wiring and final
adjustment, to ensure that the Digital Relay meets the required performance.
The manufacturer shall be able to offer commissioning of the Digital relay to be carried out by the local or
regional office.
The most common spare parts shall be available within (x x) Hours/days from the notification through the
local or regional service centre of the supplier.
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Specification for Tender
840992135
3. Basic requirements for the Digital Protective Relay
3.1 General requirements
The Digital Protective Relay shall comply with the most relevant national, international standards and
recommendations for industrial electrical distribution (IEC, EN, UL, CSA) as per table (1)
Digital Protective Relay Standards - Table 1 Requirements
Protection relays
Electro Magnetic
Emission tests
Compatibility (EMC)
Disturbing field emission
Conducted field emission
Immunity tests
Radiated disturbances
– radiated fields
– electrostatic discharge
– to power magnetic fields at
network frequency
Conducted disturbances
– RF disturbances
– fast transient bursts
– damped oscillating waves
– surges
– voltage interruptions
Standards
IEC 60255
IEC 60255-25
EN 55022
IEC 60255-25/EN 55022
IEC 60255-22-3
IEC 61000-4-3
ANSI C37.90.2
IEC 60255-22-2, ANSI C37.90.3
IEC 61000-4-8
Level
A
III
4
IEC 60255-22-6
IEC 60255-22-4
IEC 61000-4-4
ANSI C37.90.1
IEC 60255-22-1, ANSI C37.90.1
IEC 61000-4-5
IEC 60255-11
III
A and
B
IV
III
Environmental
Mechanical constraints
Safety
Climatic conditions
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In operation
– vibrations
– shocks
– earthquakes
De-energised
– vibrations
– shocks
– jolts
Enclosure tests
– Mechanical protection degree
– Fire withstand
Electrical tests
– earth continuity
– 1.2/50µs impulse wave
– dielectric at network frequency
In operation
– to cold
IEC 60255-21-1
IEC 61000-2-6
IEC 60255-21-2
IEC 60255-21-3
2
Fc
2
2
IEC 60255-21-2
IEC 60255-21-2
IEC 60255-21-2
2
2
2
IEC 60529
NEMA
IEC 60695-2-11
IP52
Type
12
IEC 61131-2
IEC 60255-5
IEC60255-5, ANSI C37.90
IEC 61068-2-1
Ad
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Specification for Tender
840992135
– to dry heat
– to damp heat
– salt mist
– corrosion influence/Gas test
In storage
– temperature variation
– to cold
– to dry heat
– to damp heat
Certification (*)
CE
UL
CSA
GOST
Low Voltage electrical
installations
Functional Safety of
electronic safety related
systems
Communication
IEC 61068-2-2
IEC 61068-2-78
IEC 61068-2-52
IEC 61068-2-60
Bd
Cab
Kb/2
IEC 61068-2-14
IEC 61068-2-1
IEC 61068-2-2
IEC 61068-2-78
IEC 61068-2-30
EN 50263 harmonised standard
European directive
UL508
CSA C22.2
Nb
Ab
Bb
Cab
Db
IEC 60364
IEC61508
Data transmission industrial
protocol: Modbus RTU
Between protective relay and
control system inside a power
station
For power substation automation
inside the substation
IEC 61158 Field Bus foundation
EC 870-5 series and
IEC 870-5-103 – DNP3
IEC 61850
(*) The Digital Protective Relay shall be CE marked, conforming to European Low Voltage (73/23 EEC and
93/68 EEC) and EMC (89/336/EEC) Directives, UL/CSA marked according to UL 508C and shall have
GOST marking for Russia and Eastern Europe.
3.2 General Digital Protective Relay design requirements
3.2.1 Technology and Functionality:
The Digital Protective Relay design shall be based on a microprocessor technology and shall accommodate a
hardware and software architecture consisting of a multifunction protection and control platform with
logic/analogue inputs and outputs, including Protections, Metering, Control and Monitoring, User Machine
Interface with alphanumeric display, Communication Interface, Network, Machine, Switch gear and relay
diagnosis functionalities.
3.2.2 Safety and Dependability (Functional Safety)
The Digital Protective Relay design shall be part of a safety and dependability design process of the
manufacturer, associating the four R.A.M.S parameters:
3.2.2.1 Reliability:
To define a predictive calculated and field measured MTTF, determine a  Failure Rate and a useful life
time of the digital relay.
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3.2.2.2 Availability:
To prevent any nuisance or unwanted tripping by selecting the adequate settings and improve the continuity
of service.
3.2.2.3 Maintainability:
To define the Time to repair and spare part requirements in the maintenance process.
3.2.2.4 Safety:
To increase the level of protection safety without lowering the process availability according to IEC 61508
requirements and determine a S.I.L (Safety Integrity Level) capability, a P.F.D ( Probability of Failure on
Demand) and a S.F.F (Safe Failure Fraction) measuring the percentage of failures seen by the Watchdog
leading to a safe position.
The Digital Protective Relay shall therefore be fitted with an internal self-test monitoring system
(“Watchdog”) testing the relay power supply, the acquisition of current and voltages signals, the processing
unit (memories, processor(s)), software/hardware watchdog, logic inputs/outputs.
In case of an internal failure making the relay inoperant, the relay shall be set in fail-safe position leading to
a fall-back position and shall not trip the circuit breaker equipped with shunt trip coil (e.g: loss of internal or
external power supply). All the relays outputs and logic inputs shall be locked in deactivated position.
The watchdog function shall be able to activate a vertical back-up protection architecture based on an
upstream protective relay rescuing a downstream defective relay.
Any minor safe internal failure shall enable the relay to normally perform its protection functions in a
downgrading mode.
3.2.3 Programming and Configuration
The Digital Protective Relay shall be programmable and configurable with an appropriate user-friendly
setting software using a MS Windows program running on a standard PC. The programming and
configuration shall be carried out locally (front access) through a RS 232 port or remotely through a
communication network, mainly an Engineering LAN (E-LAN) with adequate passwords to prevent any
unwanted intrusion.
Programming and configuration shall also be able to be prepared on a PC file directly (unconnected mode)
and down-loaded locally or remotely into the relay.
3.2.4 Hardware and Software architecture
The hardware and software architecture shall be modular and disconnectable to adapt the protection and
control unit to the required level of complexity of the MV applications.
The architecture shall allow future extensions by simple and easy hardware and firmware upgrading of the
protection and control unit and shall be designed to enable upward compatibility between Digital Protective
Relay of different generations of the manufacturer.
The architecture shall provide easy cost efficient maintenance operations when changing modules.
The Protective Digital relay shall accommodate digital and isolated inputs/outputs. The inputs shall be used
to monitor the status of the complete MV panel as well as receive external signal (e.g: Buchholz, inter-trip,
etc,) while the outputs shall be used for circuit breaker or contactor control, inter-tripping between panels
and remote alarms.
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Specification for Tender
840992135
3.3 Digital Protective Relay general and practical operating requirements
The Protective Digital Relay shall operate according to the following conditions:
Temperature:
External auxiliary power supply:
- For Low and Mid-end solutions/ applications
- For High-end solutions/applications:
Current sensors:
Voltage sensors:
- 25°C to +70°C
From AC/AC UPS system or dual battery charger
24V-250V DC and 110V-240V AC (50Hz/60Hz)
24V-250V DC
In/1A or In/5A current transformers, LPCT( Low Power
Current Transformer) , Core Balance CT’s or interposing
ring CT
100V, 110V, 100V/ 3, 110V/3 and voltages as per IEC
60 255-6
3.3.1 The circuit breaker control output relay contact shall be capable of withstanding a 30A DC current for
0.2seconds and 2000 operating cycles according to ANSI C37.90-clause 6.7.
3.3.2 Other logic output relay contacts shall be capable of withstanding a 8A DC/AC steady state current
3.3.3 Logic input pilot voltage shall be rated as per the auxiliary power supply of external driven digital
signals from the control system (RTU or PLC) and shall comply with IEC 60011-32.
3.3.4 Current carrying terminal from current sensors shall be automatically short circuited when withdrawing
current sensor modules.
3.3.5 Provisions shall be made in the switch gear cubicle for testing and calibrating the relay by current
injection using an external source, without disconnecting the permanent wiring.
3.3.6 CT/VT and Trip coil supervision facilities shall be provided to check the wiring circuit continuity with
relevant alarms and messages.
3.3.7 The Digital Protective Relay shall be continuously rated and shall maintain the setting accuracy
without setting drift over time and full range of auxiliary voltage variations as per the requisition.
3.3.8 The Digital Protective Relay shall be capable of withstanding the output current of the associated
current transformers corresponding to a primary current equal to the specified short circuit withstand current
and time of the assembly ( 4 In permanent, 100 In 1 second).
3.3.9 The Digital Protective Relay shall have a constant 150 year minimum design MTTF during its useful
life time which shall not be less than 15 years in proper temperature and environmental operating conditions.
3.3.10 Any component substitution because of component obsolescence shall not affect the upward
compatibility between relays on duty
3.4 Digital Protective Relay installation rules and requirements
The Digital Protective Relay shall be able to be flush mounted or mounted inside the Low Voltage
compartment and shall have an IP52 mechanical protection degree according to IEC 60529.
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Specification for Tender
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To operate properly and to achieve satisfactory operating quality, the Digital Protective Relay shall be
installed so that it shall be protected against EMC, and the following points shall be required:
3.4.1 A single equipotential earth system used as the site potential reference
3.4.2 A power distribution with TN-S earthing system
3.4.3 Separation of different kinds of cables (power, power supply, auxiliary, data, measures)
3.4.4 Use of equipotential metallic structure for cable trays
3.4.5 Use of screened cables for data and measure
3.4.6 A power supply protection (filtering, over voltage protection)
3.4.7 Equipment and installation protection against the indirect effects of lightning
4. Digital Protective Relay description
4.1 Protection
The Digital Protective Relay shall integrate all the necessary ANSI code protections according to the
different levels of applications (as per the protection selection guide in Annex A1, A2, A3, A4, A5, A6) and
shall provide wide setting ranges mainly for current protections and a large choice of tripping curves through
two setting groups (normal/back-up mode network) operated by logic input:
4.1.1 Definite Time (DT) curve
4.1.2 IDMT curves set by T time delay or TMS factor, including:
- IEC curves (SIT, VIT/LTI, EIT)
- IEEE curves (MI, VI, EI)
- Usual curves (UIT, RI, IAC)
4.1.3 Customised tripping curve possibilities shall be available for specific Phase, Earth fault over current
and directional Phase, Earth fault applications or revamping
ANSI code
50/51(High-end
solutions/applications)
Tripping
curve
DT
IDMT
Threshold
Tripping time delay
Is set point
0,05 to 24 In
0,05 to 2,4In
Inst: 0,05 sec to 300 sec
0,1 sec to 12,5 sec at 10
Is
Inst: 0,05 sec to 300sec
0,1sec to 10 Is0
50N/51N (High-end
solutions/applications)
DT
IDMT
Is0 set point
0,01 to 15 In0 (min
0,1A)
0,1 to 1 In0 (min 0,1A)
50/51(Low, Mid-end
solutions/applications)
DT
IDMT
Is set point
0,1 to 24 In
0,1 to 2,4In
50N/51N(Low, Midend solutions
/applications)
DT
IDMT
Is0 set point
0,1 to 15 In0
0,1 to 1 In0
Inst: 0,05 sec to 300 sec
0,1 sec to 12,5 sec at 10
Is
Inst: 0,05 sec to 300sec
0,1sec to 10 Is0
4.1.4 Overload protection shall be based on RMS current value (Minimum 13th Harmonic) and shall take the
ambient temperature into account.
4.1.5 Phase over current and earth fault protection shall have an adjustable timer hold to allow re-striking
fault detection
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Specification for Tender
840992135
4.1.6 Earth fault protection shall integrate a H2 Harmonic restraint for transformer start-up inrush current to
be activated or inhibited
4.1.7 Differential protection shall integrate H2 and H5 Harmonic restraint to prevent a transformer nuisance
tripping during the energising period
4.1.8 Alternative over current setting groups shall be selectable by logical conditions through logic inputs, to
adapt a fast protection plan change as well as setting facilities for thresholds and time delay adjustment.
4.1.9 The Digital and protective Relay shall allow the use of upstream and logic discrimination in a
cascading scheme or closed loop applications.
4.2 Control and Monitoring
The Digital Protective Relay shall basically carry out all the ANSI code Control and Monitoring functions
necessary to control the Circuit Breaker or Contactor for electrical operations.
These operations shall be performed from pre-defined functions using logic inputs/outputs and shall be
processed from internal and external data for:
4.2.1 Circuit breaker/Contactor control - ANSI 94/69
4.2.1.1 On/Off control whatever the type of tripping coil (shunt trip or under voltage release)
4.2.1.2 Inhibit tripping
4.2.1.3 Remote control
4.2.2 Latching /acknowledgement - ANSI 86
4.2.2.1 Latch individually all the tripping outputs and logic inputs
4.2.2.2 Used as “Lock-out relay”
4.2.3 Local annunciation - ANSI 30
4.2.3.1 LED indication (relay status)
4.2.3.2 Local annunciation on the relay display (events, alarms, messages)
4.2.3.3 Alarm processing
4.2.4 Logic discrimination - ANSI 68
4.2.4.1 Provide full tripping discrimination and faster tripping of circuit breakers close to the source in a
cascading scheme
4.2.4.2 Send and receive blocking orders between Protective Digital Relays of the cascading scheme
4.2.5 Setting groups Switching (normal to back-up mode network) with logic input
4.2.6 Output relay testing
Each output relay shall be activated for 5 seconds to check output connections and connected switch gear
operation
4.2.7 Automation functions
Mid and High-end Digital Protective Relay shall be able to provide specific control and monitoring functions
carried out with Logic Equations and/or Ladder Logic
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Specification for Tender
840992135
4.3 Metering
The Digital Protective Relay shall include accurate measurement processing functions and shall display the
metering data on the User Machine Interface to operate the different applications and carry out
commissioning and maintenance as per the following table (2):
Metering functions - Table 2Designation
Phase current I1, I2, I3 RMS
Calculated residual current I0Σ
Demand current I1, I2, I3
Peak demand current IM1, IM2, IM3
Measured residual current I0, I’0
Voltage U21, U32, U13, V1, V2, V3
Residual voltage V0
Positive sequence voltage Vd/rotation
direction
Negative sequence voltage Vi
Frequency
Active power P, P1, P2, P3
Reactive power Q, Q1, Q2, Q3
Apparent power S, S1, S2, S3
Peak demand power PM, QM
Power factor
Calculated active and reactive
energy(±Wh,±VAR)
Active and reactive energy by pulse counting
(±Wh,±VAR)
Phase current I’1, I’2, I’3 RMS
Calculated I’0 Σ
Voltage U’21, U’32, U’13, V’1, V’2, V’3,
V’d, V’i and frequency
Residual voltage V’0
Temperature
Rotation speed
Neutral point voltage Vnt
Phasor diagram
Low-end solutions /
Applications
Current or Voltage
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solutions/
Applications
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solutions/
Applications
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 (S) 
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4.4 Network, Machine and Switch gear diagnosis
The Digital Protective Relay shall provide diagnosis facilities for process management and maintenance
purpose as per table (3)
4.4.1Network diagnosis
The Digital Protective Relay shall provide network power quality metering functions and all data on detected
network disturbances to record, for analysis purpose.
4.4.2 Machine diagnosis
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For maintenance purpose the Digital Protective Relay shall provide data on the operation of the machines ,
predicted data to optimise process management, useful data to facilitate protection functions and
implementation
4.4.3 Switch gear diagnosis
The Digital Protective Relay shall provide information on switch gear mechanical status for preventive and
curative maintenance
Network, Machine, Switch gear diagnosis - Table 3 Designation
Low-end
Mid-end
High-end
solutions /
solutions/
solutions/
Applications
Applications
Applications
Switch gear diagnosis
CT/VT supervision – ANSI 60/60FL


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Trip circuit supervision – ANSI 74

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Auxiliary power supply monitoring

Cumulative breaking current



Number of operations, operating time,



charging time, number of racking out
operations
Network and Machine diagnosis
Tripping context
Tripping current Trip I1, I2, I3, I0
Phase fault and earth fault trip counters
Unbalance ratio / negative sequence current Ii
Harmonic distortion (THD), current and
voltage
Ithd, Uthd
Phase displacement φ0, φ’0, φ0 Σ
Phase displacement φ1, φ2, φ3
Disturbance recording
Thermal capacity used
Remaining operating time before overload
tripping
Waiting time after overload tripping
Running hours counter / operating time
Starting current and time
Start inhibit time
Number of starts before inhibition
Unbalance ratio / negative sequence I’i
Differential current I diff1, I diff2, Idiff3
Through current It1, It2, It3
Current displacement θ
Apparent positive sequence impedance Zd
Apparent phase-to-phase impedances Z21,
Z32, Z13
Third harmonic voltage, neutral point or
residual
Difference in amplitude, frequency and phase
of voltages compared to for synchro-check
Capacitor unbalance current and capacitance
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4.5 Relay diagnosis
The Digital Protective Relay shall contain self-test diagnosis facilities to:
4.5.1 Detect internal relay failures that may cause nuisance tripping or failed fault tripping
4.5.2 Set the relay in fail-safe position leading to a fall-back position to avoid any unwanted tripping if a
major internal failure is detected . A Watchdog relay with change over contact ( NO+NC) shall provide an
alarm or information to activate a back-up protection.
Any minor failure shall not interrupt the protection function operations and the relay shall operate in
downgraded mode
4.5.3 Inform for maintenance operation
4.5.4 Detect unplugged connectors resulting in a major internal failure
4.5.5 Check the hardware configuration
The absence or failure of a remote module shall be considered as a minor failure
The absence or failure of a Logic input/output module shall be considered as a major failure
4.6 Programming and configuration software
The Digital Protection Relay shall use a user-friendly setting and operating multi-lingual software in
Windows environment with menus and icons for fast direct access to the data required, guided navigation to
go through all the data on the same function together in the same screen and with a file management:
4.6.1 Prior to commissioning and without connection to the relay (unconnected mode), to prepare the relay
protection and parameter settings:
– configure the relay and extension modules and entry of general settings
– enable/disable functions and entry of general settings
– adapt pre-defined control and monitoring functions
– create specific mimic diagrams for local display
4.6.2 During commissioning , on a PC connected point-to-point to the front panel
– access to all functions available in unconnected mode, after entering the protection settings or parameter
setting password
– transfer of the relay parameters and protection setting file, prepared in unconnected mode, protected by te
parameter setting password
– display of all the measurements and useful information during commissioning
– display of logic inputs, logic outputs and LED status
– test of logic inputs
– display of automation variables
– modification of passwords
4.6.3 During operation, on a PC connected to a set of relays via an E-LAN multi-point communication
network
– read relay protection and parameter settings, modifications following entry of protection setting or
parameter password
– display the relay measurement data
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– display the time-stamped alarm messages
– display the relay, switch gear and network diagnosis data
– retrieve disturbance recording data
4.7 User Machine Interface
4.7.1 The Digital Protective Relay shall incorporate a User Machine Interface (or UMI) with an
alphanumeric graphical LCD and back-light display screen indicating:
- Measurement values
- Operating messages in major international languages (English native and local language) or shall accept
translation possibilities if not available in the basic relay
- System maintenance messages
4.7.2 The UMI shall display a clear information of alarm conditions.
Signalling LED shall be available for alarms and status, including: Circuit Breaker position (open/closed),
relay self test, phase fault and earth fault alarms. The UMI shall accept specific LED assignments
4.7.3 The UMI shall enable to:
- Display metering and operating data, alarms and messages
- Clear alarms and resetting
- Access to protection and parameter settings
4.7.4 Access to setting mode shall be protected by two dedicated passwords of at least four digits: the first
password shall protect access to protection settings, the second one shall protect to parameter settings
4.7.5 The User Machine Interface shall be available as:
- Basic UMI including signalling and operating status LED
- Advanced integrated or remote UMI monitoring measurement data and messages for local equipment
operation
- Mimic-based UMI ( High-end application) with selection of control mode (remote, local, test), animated
mimic diagram
4.8 Communication
4.8.1 The Digital Protective Relay shall be communicating through one or two communication ports and
integratable in a communication architecture with information remote access.
It shall be able to be interfaced to two types of communication networks providing access to data on each
communication port, via:
- A multi-protocol based Supervisory Local Area Network (S-LAN) to supervise functions regarding the
installation and the electrical network from a supervision system (SCADA or RTU).
- Modbus based Engineering Local Area Network (E-LAN) to configure, set up the relay, collect operating
and diagnosis information, monitor the status of the electrical network and run diagnostics on electrical
network incidents from the programming and configuration software.
4.8.2 The Digital Protective Relay shall use appropriate communication protocols depending on whether the
relay interfaces an industrial process electrical network or a power substation of electrical distribution.
- Modbus RTU, Field bus and Industry data transmission protocol, IEC 61158 foundation compliant,
through Twister-Pair cable RS 485 (2-wire or 4-wire) or Fibre Optic link.
- Modbus RTU through Twisted Pair cable RS 485 (2-wire or 4-wire), over Ethernet TCP/IP 10/100 Mbits
Base Tx or Base Fx, through a multiple entry gateway (average 10 relays per gateway).
- IEC 870-5-103, a companion standard of IEC 870-5 series to communicate between the Digital Protective
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Specification for Tender
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Relay and the control system (Supervisor or RTU) inside a Utility power substation, through Twisted Pair
cable RS 485 (2-wire) or Fibre Optic link.
- DNP3, a data transmission protocol for remote control and monitoring of Utility power substations, IEC
870-5 series compliant, through Twisted Pair cable RS 485 (2-wire) or Fibre Optic link.
- IEC 61850 for Utility HV/MV Power Station Automation inside the substation through Ethernet 10//100
Mbits Base Tx or Base Fx , and Fibre Optic link, embedded in the relays or through a multiple entry
gateway.
4.8.3 The Digital Protective Relay and the Supervisor shall transmit operating data protected by password:
- Relay to Supervisor: metering and diagnosis information.
- Supervisor to Relay: remote-control orders.
4.8.4 The Digital Protective Relay shall provide:
- time-stamped events facilities regarding the status changes of all logic inputs and all remote indications to
time-stamp event within one millisecond.
- time-setting and synchronisation facilities to ensure a long term stability or to co-ordinate a number of
relays to be synchronised by an external pulse to a dedicated logic input or via the communication link.
4.8.5 The Digital Protective Relay shall have remote setting possibilities to select protection-setting groups,
read general parameters, read protection settings remotely, write protection settings remotely to be inhibited
by parameter setting if needed.
4.8.6 The digital Protective Relay shall have network diagnostic information available, recorded in files, to
transmit over the communication link:
- disturbance-recording records in COMTRADE format according to IEC 60255-23.
- tripping contexts.
- out-of-synchronisation context.
4.9 Digital Protective Relay hardware architecture platform
As per Annexes 7
5. Tender documents
To support its technical offer description, the bidder shall submit the following documents relative to the
Digital Protective Relay:
5.1 Relay architecture single line diagrams
5.2 Technical data sheets
5.3 Catalogues
5.4 User manuals and installation guide
5.5 Test and conformity certificates
5.6 Reference lists for similar application
6. Protection relay testing , commissioning and maintenance
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Specification for Tender
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6.1 Testing:
Digital protective relays shall be tested prior to commissioning in order to maximise availability and
minimising the risk of malfunctioning of the assembly being commissioned.
Because of the use of digital technology the relay shall guarantee the reproducibility of announced
performances over time and shall have undergone full factory qualification.
So the Protective Digital Relay shall therefore be ready to operate without requiring any additional
qualification testing that concerns it directly
6.2 Commissioning tests:
The preliminary relay commissioning tests shall be limited to a commissioning check:
6.2.1 Checking of compliance with bill of materials and hardware installation diagrams and rules during a
preliminary general check
6.2.2 Checking of the compliance of the general settings and protection settings entered with the setting
sheets
6.2.3 Checking of current or voltage input connections by secondary injection tests
6.2.4 Checking of logic input and output connections by simulation of input data and forcing output status
All the tests shall be carried out with the MV cubicle completely isolated and the MV circuit breaker racked
out (disconnected and open)
All the test shall be performed in the operating situation with the parameter setting and operating software or
without software for relay with advanced UMI: no wiring or setting changes, even temporary changes to
facilitate testing shall be allowed.
6.3 Maintenance
The Digital Protective Relay shall not need any internal and specific maintenance over time, mainly for
parameter settings and after commissioning.
Nevertheless connections to the relay shall be checked preventively as well as the quality of output relay
contacts to ensure that tripping and closing coils are properly energised and all control logic orders are
properly transmitted .
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Specification for Tender
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7. Annexes
7.1 Annex A1
Protection selection guide for Substation applications
ANSI
Codes
Designation
50/51
50N/51N
50G/51G
50BF
46
49RMS
67
67N/67NC
32P
37P
27D
27R
27
59
59N
47
81H
81L
81R
79
25
Phase over current
Earth fault/Sensitive Earth fault
Breaker Failure
Negative sequence / unbalance
Thermal overload for cables
Directional Phase over current
Directional Earth Fault
Directional active overpower
Directional active under power
Positive sequence under current
Remanent over voltage
Under voltage (L-L or L-N)
Over voltage (L-L or L-N)
Neutral voltage displacement
Negative sequence over voltage
Over frequency
Under frequency
Rate of change of frequency
Recloser (4cycles)
Synchro-check
Last update : 2017-05-08
Low-end solutions/
Applications
Current Voltage
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Applications
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High-end
solutions/
Applications
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Specification for Tender
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7.2 Annex A2
Protection selection guide for Busbar applications
ANSI
Codes
Designation
50/51
50N/51N
50G/51G
50BF
46
27D
27R
27
59
59N
47
81H
81L
81R
25
Phase over current
Earth fault/Sensitive Earth fault
Breaker Failure
Negative sequence / unbalance
Positive sequence under current
Remanent over voltage
Under voltage (L-L or L-N)
Over voltage (L-L or L-N)
Neutral voltage displacement
Negative sequence over voltage
Over frequency
Under frequency
Rate of change of frequency
Synchro-check
Last update : 2017-05-08
Low-end solutions/
Applications
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Applications
solutions/
Applications
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Specification for Tender
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7.3 Annex A3
Protection selection guide for Transformer applications
ANSI
Codes
Designation
50/51
50N/51N
50G/51G
50BF
46
49RMS
64REF
87T
Phase over current
Earth fault/Sensitive Earth fault
Breaker Failure
Negative sequence / unbalance
Thermal overload for machines
Restricted Earth Fault
Two-winding transformer
Differential
67
Directional Phase over current
67N/67NC Directional Earth Fault
32P
Directional active overpower
24
Over fluxing (V/ Hz)
27D
Positive sequence under current
27R
Remanent over voltage
27
Under voltage (L-L or L-N)
59
Over voltage (L-L or L-N)
59N
Neutral voltage displacement
47
Negative sequence over voltage
81H
Over frequency
81L
Under frequency
26/63
Thermostat/Buchholz
38/49T
Temperature monitoring
25
Synchro-check
Last update : 2017-05-08
Low-end solutions
/ Applications
Current Voltage
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Mid-end solutions/ High-end
Applications
solutions/
Applications
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Specification for Tender
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7.4 Annex A4
Protection selection guide for Motor applications
ANSI
Codes
Designation
Low-end solutions/
Applications
50/51
50N/51N
50G/51G
50BF
46
49RMS
87T
Phase over current
Earth fault/Sensitive Earth fault
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Mid-end solutions/ High-end
Applications
solutions/
Applications
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Breaker Failure
Negative sequence / unbalance
Thermal overload for machines
Two-winding transformer
Differential
87M
Machine differential
67N/67NC Directional Earth Fault
32P
Directional active overpower
32Q/40
Directional reactive overpower
40
Field loss (under impedance)
37
Phase undercurrent
48/51LR/1 Excessive starting time, locked
4
rotor
66
Starts per hour
78PS
Pole slip
12
Over speed (2 set points)
14
Under speed (2 set points)
27D
Positive sequence under current
27R
Remanent over voltage
27
Under voltage (L-L or L-N)
59
Over volatage (L-L or L-N)
59N
Neutral voltage displacement
47
Negative sequence over voltage
81H
Over frequency
81L
Under frequency
26/63
Thermostat/Buchholz
38/49T
Temperature monitoring
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Specification for Tender
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7.5 Annex A5
Protection selection guide for Generator applications
ANSI
Codes
Designation
50/51
50N/51N
50G/51G
50BF
46
49RMS
64REF
87T
Phase over current
Earth fault/Sensitive Earth fault
Breaker Failure
Negative sequence / unbalance
Thermal overload for machines
Restricted Earth Fault
Two-winding transformer
Differential
87M
Machine differential
67
Directional Phase over current
67N/67NC Directional Earth Fault
32P
Directional active overpower
32Q40
Directional reactive overpower
37P
Directional active under power
40
Field loss (under impedance)
78PS
Pole slip
12
Over speed (2 set points)
14
Under speed (2 set points)
50V/51V Voltage-restrained over current
21B
Under impedance
50/27
Inadvertent energization
27TN/64G Third H3 Harmonic under
2
voltage/100%stator Earth Fault
64G
24
Over fluxing (V/ Hz)
27D
Positive sequence under current
27R
Remanent over voltage
27
Under voltage (L-L or L-N)
59
Over voltage ( L-L or L-N)
59N
Neutral voltage displacement
47
Negative sequence over voltage
81H
Over frequency
81L
Under frequency
26/63
Thermostat/Buchholz
38/49T
Temperature monitoring
25
Synchro-check
Last update : 2017-05-08
Low-end solution Mid-end
/ Application
solution/
Application
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Applications
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Specification for Tender
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7.6 Annex A6
Protection selection guide for Capacitor applications
ANSI
Codes
Designation
Low-end solutions/
Applications
50/51
50N/51N
50G/51G
50BF
46
49 RMS
51C
24
27D
27R
27
59
59N
47
81H
81L
38/49T
Phase over current
Earth fault/Sensitive Earth fault
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Mid-end solutions/ High-end
Application
solutions/
Applications
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Breaker Failure
Negative sequence / unbalance
Thermal overload for capacitors
Capacitor bank unbalance
Over fluxing (V/ Hz)
Positive sequence under current
Remanent over voltage
Under voltage (L-L or L-N)
Over voltage ( L-L or L-N)
Neutral voltage displacement
Negative sequence over voltage
Over frequency
Under frequency
Temperature monitoring
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Last update : 2017-05-08
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Specification for Tender
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7.7 Annnex A7
Digital Protective Relay hardware architecture platform
Designation
Low-end solutions Mid-end
/ Applications
solutions/
Current or Voltage Applications
High-end
solutions/
Applications
Main analogue inputs:
– Phase current: I1, I2, I3
– Residual current: Io
– Phase voltage: V1, V2, V3
– Residual Voltage: Vo
 (3)
 (1)
–
–
–
–
 (3)
 (1)
 (3)
 (1)
 (3)
 (1)
 (3)
 (1)
 (3)
 (1)
Additional analogue inputs ( differential protection)
– Phase current: I’1, I’2, I’3
– Residual current: I’o
– Phase voltage: V’1, V’2, V’3
– Residual Voltage: V’o
–
–
–
–
–
–
–
–
–
–
–
–
 (3)
 (1)
 (3)
 (1)
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–
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Removable memory cartridge
–
–
–
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Back-up battery
–
–
–
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Communication ports
 (1)
 (1)
 (1)
 (2)
Logic relay outputs
 (4)
 (4)
 (4)
 (5)
Additional Logic inputs/outputs
– Outputs
– Inputs
 ( 4)
 (10)
 ( 4)
 (10)
 ( 4)
 (10)
 (18)
 (42)
Temperature data inputs
 ( 8)
 ( 8)
 (16)
 (16)
Analogue Output
 ( 1)
 ( 1)
 ( 1)
 (1)
Synchro-check (Load sharing)
–
–
–
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Multi-protocol Communication
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Programming and configuration local /remote
software

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User Machine Interface (UMI)
– Basic UMI
– Advanced UMI
 integrated
 remote
– Mimic-based UMI
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