Download A30 or A130 This is Yellow Phase differential

Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
WORK INSTRUCTION PROCESS FOR
INSPECTION, TESTING &
COMMISSIONING OF ELECTRICAL
SWITCH BOARD & SWITCHYARD
VERSION NO.: 1
REVISION NO.: FIELD CHANGE
FIELD CODE:
DATE
PAGES: 1 OF 22
PREPARED BY
LEGALIZED BY
___________
PROJECT DIRECTOR
SIGNATURE:
___________
QMR
SIGNATURE:
DATE: 2 APRIL 1998
DATE
APPROVED BY:
________________
ELECTRICAL DIVISION MANAGER
SIGNATURE:
DATE:
Page
No.
Rev.
No.
N/A
N/A
N/A
N/A
Amendment record
Description of Amendment
First Issue of WI016, Ver. 1 & Rev. 0 for
PT _______
Page OF 22
Revision 1
Battery & Battery Charger Inspection Record
Incorporated
DISTRIBUTION TO:
1) ALL MANUAL HOLDER
Date of
issue
QMR
Legalized
Date
Electrical
Authorized
Date
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
WORK INSTRUCTION PROCESS FOR INSPECTION, TESTING & COMMISSIONING OF
ELECTRICAL SWITCH BOARD & SWITCH YARD
1.0
PURPOSE
2.0
SCOPE
3.0
RESPONSIBILITIES
4.0
DEFINITIONS
5.0
PROCEDURES
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
5.16
QUALITY RECORDS
6.0
GENERAL
POLARITY CHECKS
RATIO CHECKS
MAGNETIZATION CURVE
VOLTAGE TRANSFORMER TEST
RATIO CHECK
PHASING CHECK
SECONDARY INJECTION
HI-POT TESTING USING FERRANTI HI-POT SET
HI-POT TESTING USING BIDDLE HI-POT TEST SET
EARTH RESISTANCE TEST (ET5) TO AS3000
DUCTER TESTING (SWITCH GEAR)
BLOCK DIAGRAM OF COMMISSIONING HV SWITCH YARD
BLOCK DIAGRAM OF COMMISSIONING HV SWITCH BOARDS
MIDOS RELAY TYPES
COMMISSIONING CHECK LIST
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
1.0
PURPOSE
1.1
2.0
SCOPE
2.1
3.0
To ensure testing carried out in Switch Yards and Switch Boards is done so in a
planned acceptable manner.
This procedure applied to the testing of all switch gear undertaken by PT ______
Technical Services Division except if otherwise directed by the Client.
DEFINITIONS
The Client
4.0
Main Contractor
RESPONSIBILITIES
4.1
The Technical Services Supervisor is responsible for:
(a) Coordination of inspection activities
(b) Ensuring test reports are sent out to clients.
4.2
5.0
Technical Services Technicians are responsible for carrying out tests as directed in
accordance with these procedures, and recording the test or inspection results on
the correct form.
PROCEDURES
5.1
General
5.1.1 All results of equipment tested shall be recorded on the relevant test sheet,
refer Section 5.0, copies being in Procedures Manual PM2.
5.1.2 All equipment used for inspection and testing shall carry a current
calibration sticker is not affixed, contact the Technical Services Supervisor.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.1.3 If any equipment should fail inspection and/or testing, the client will be
notified at the time of testing or, if not available, at the earliest possible time.
5.1.4 A test report will be issued to the Client for all inspection and testing
undertaken if the specified in the contract or on request from the Client.
5.2
Polarity Checks
Each current transformer should be individually tested to verified that the primary
and secondary polarity markings are the same as drawings supplied by client.
At current transformer terminals in Protection/Metering Panel. The
Protection/Metering Terminal identification is as follows:
C10
C30
C50
C70
This is Red Phase over-current or earth fault protection
This is Yellow Phase over-current or earth fault protection
This is Black Phase over-current or earth fault protection
This is Neutral over-current or earth fault protection
A10 or A110
A30 or A130
A50 or A150
A70 or A170
D10
D30
D50
D70
This is Red Phase differential protection
This is Yellow Phase differential protection
This is Black Phase differential protection
This is Neutral differential protection
This is Red Phase metering
This is Yellow Phase metering
This is Black Phase metering
This is Neutral Metering return
NOTE:
The above identifications always starts with A, C or D but the numbers
may be slightly different. The numbers always use 10, 30 and 50 but
maybe the number is C110. This is done when there are several
protection schemes on the same feeder.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
Method
Connect polarity test set as per drawing, Fig. 1, by pushing test button down, a
positive flick on the meter should occur. If this does not occur follow check chart
below.
FIGURE 1 POLARITY
CHECK
P2
P1
S2
S1
Button
Push
-
+
FIGURE 1 POLARITY CHECK
Check list Meter Polarity Incorrect
1. Check drawing for correct P1-P2 directions
2. Check connection on polarity test set
NO FLICK ON METER
1. Open lines on C T Terminals
2. Check you have to correct numbers (ie C10 and C11)
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.3
Ratio Checks
This check is usually carried out to verify the ratio of the CT to the drawings.
Current is passed through the primary conductors and measured by means of the
test set ammeter or CT used in conjunction with the test set A1. The secondary
current is measured on the ammeter A2 in Figure 2 and A2 + A3 in Figure 3.
FIGURE 2 CURRENT TRANSFORMER CHECKS
(SINGLE PHASE)
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
P2
P1
S2
S1
A2
51
A1
250V AC supply
FIGURE 2 CURRENT TRANSFORMER CHECKS (SINGLE PHASE)
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
FIGURE 3 CURRENT TRANSFORMER
CHECKS
(TWO PHASES)
A1
A
B
C
A2
Links open, ammeter
in series
51
51
64
primary injection set
FIGURE 3 CURRENT TRANSFORMER CHECKS (TWO PHASES)
IMPORTANT:
When injection of current is taking place make sure, if there is more than 1 CT
in that Phase that the CT’s not in test are shorted out and not open circuit.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.4
Magnetization Curve
This test is carried out when commissioning to,
1. verify the CT is manufactures specs,
2. check that when the equipment has been assembled they have been wired
correctly, ie over-current and differential are correctly wired.
When checking aboard with metering, over-current and differential the knee point
curve should be very low with saturation flux as low as 20-30V were as the overcurrent voltage will be around 120V to 180V. Differential CT’s have a knee point
around 500V upwards.
FIGURE 4 KNEE POINT OF
CT
Knee Point of C.T. 50%
increase in current to 10%
increase in voltage
V
I
FIGURE 4 KNEE POINT OF CT
Types of CT’s used,
Class 1
IOP50
005P2O
= Metering CT’s
= Over-current type CT’s
= Differential type CT’s
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
FIGURE 5 TESTING CURRENT TX MAGNETIZING CURVE
C10
CII
Y
A
Step up transformer
250V 1000V if required
Variable
Transformer
250V supply
FIGURE 5 TESTING CURRENT TX MAGNETISING CURVE
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
METHOD
Several points must be checked on each CT. This is done through a variable
transformer while the primary CT circuit remains open. See Figure 5. The
magnetizing current is measured on the ammeter A and the secondary voltage
using a voltmater. The applied voltage would be slowly raised until the
magnetizing current is seen to rise rapidly (50% increase in current to 10%
increase in voltage), for a small increase in voltage.
This indicates the
approximate knee point of the CT. The magnetizing current should be recorded
using Technical Service sheets.
It is often found that the current transformer with a secondary rating of 1 ampere or
less have a knee point voltage higher than the legal main supply. In this case a
step up transformer may be required to obtain the necessary voltage to check the
curve.
5.5
Voltage Transformer Tests
The voltage transformer polarity can be checked with the test described for the
main current transformers, care must be taken to connect the battery supply to the
primary winding, with the polarity ammeter connected to the secondary winding if
the voltage transformer is of the capacitor type, then the polarity of the transformer
at the bottom of the capacitor stack should be checked.
5.6
Ratio Check
This check is carried out on HV voltage transformers to verify the ratio is correct.
Method
As in Figure 6 22kV side of transformer is energized using 415V. Readings should
be taken on LV side phase to phase to neutral. Taking the ratio into consideration
the voltage on the secondary of a 22000V/110V transformer should be phase
2.08V and phase to neutral 1.20V.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
FIGURE 6 VOLTAGE RATIO TEST
Ratio 200:1
110V
FIGURE 6 VOLTAGE RATIO TEST
5.7
Phasing Check
The secondary connections for a three phase voltage transformer or a bank of
three single voltage transformers must be carefully checked for phasing. With the
main circuit alive, the secondary voltages between the phases and neutral must be
measured for correct magnitudes. The phase rotation should then be checked with
a phase rotation meter connected across the three phases, as shown in Figure 7.
Provided an existing proven VT is available on the same primary system and that
the secondary earthing is employed, all that is now necessary to prove correct
phasing is a voltage check between, both “A” phase secondary outputs, there
should be normally little or no voltage if the phasing is correct. B&C phase should
be checked also, this proves the system by means of secondary phasing checks.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
FIGURE 7 TRANSFORMER PHASING
CHECK
Meter check R T or Voltage = OV
V
LV Winding
HV Winding
FIGURE 7 TRANSFORMER PHASING CHECK
5.8
Secondary Injection
These test are generally described in the manufactures service manual for relays,
but brief details are given below for the main types of protection relays.
Equipment
It is common practice to provide test blocks or test sockets in the relay circuits so
that connections can readily be made to test without disturbing wiring. A later
development was the test plug which can be used to plug into draw-out relay case
or into test block nominated near to a non draw-out relay case.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
When used with a draw-ou relay the multiple figures of the test plug are inserted
between the contract stripes of the case and the draw-out chassis are normally
spinning together to make firm contact.
Since the top and bottom contact or each test plug finger is separated by an
insulation strip to relay circuits can be completely isolated from the switchgear wire
when the test plug is inserted, ie is most important to remember, that the correct
transformer shorting switches, will not be shorted links are fitted across all live side
CT terminals of the test plugs before it is inserted. When the test plus is inserted
in position all the test circuitry can now be connected to the isolated ‘Relay Side’
test plug terminals.
Withdrawing the test plug immediately restores the connections to the main current
transformers and voltage transformers removed is the test connections and also
the short circuits which had been applied to the main CT secondary circuits.
A recent development has been the testing facilities provided for the modular type
case. The heavy current connectors at the extreme right hand side of the case are
normally connecting the main A.C. and D.C. incoming supplies to the relay and
hold open short circuiting switches provided in the case to prevent CT secondary
circuits from being open circuited.
When these connections are removed, the relay is isolated and the main current
transformer incoming connections are automatically short circuited.
A test plug may then be inserted so that secondary injection test can take place.
As previously described for the draw-out case, care must be taken then inserting
plug as the CT terminals are open circuited. As previously described CT terminals
must have shorting links in before plug is inserted. The relay is now isolated for
testing in the case of an MCGG63 (over-current and earth fault relay) terminals 13
and 14 must be linked, 15 and 16 must be linked this give the relay its supply.
Care must be taken to make sure 13 is positive and 14 is negative at relay
terminals.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.9
Hi-Pot Testing using Ferranti Hi-Pot Test Set
Cable testing as per AS 1026 & AS 1429
5.9.1 Insulation Test (Before)
For a XLPE cable, which is individually screened each core should be
tested between screen and core. Results should be in the high Meg-ohms.
Each test should be for 1 minute.
For cables which are not individually screened, each core should be tested
to earth with the other cores at earth potential. Results should be in high
Meg-ohms. Each test, should be 1 minute.
The above test should be carried out using test report number-------.
5.9.2 HV Test
(a) Core to Screen Test
For core to screen test, connect HV probe into negative output of test
set. Connect HV prove to core under test, and earth to screen of cable.
Turn on key switch, then HV switch. HV light should be on. With
voltage control knob wound back fully anticlockwise, a micro switch
should be heard operating. Slowly wind knob clockwise, observe
voltage increase and milliamp meter. Once required voltage has been
reached, time test for period specified. Discharge cores after each test,
using discharge stick.
(b) Core to Core Test
For core to core testing, connect HV probes into negative and positive
outputs of test set. Connect earth of test set to earth on cable. Connect
probes to cores under test, making sure spare core is connected to
positive output of test set. Turn on key switch, then HV switch, HV light
should be on.
With voltage control know wound back fully
anticlockwise, a micro switch should be heard operating. Slowly wind
know clockwise, observing voltage increase and milli-amp meter. Once
required voltage has been reached, time test for period specified.
Discharge cores after each test, using discharge stick.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.9.3 Insulation Test (After)
For a XLPE cable, which is individually screened, each core should be
tested between screen and core. Results should be in the high Meg-ohms.
Each test should be for 1 minute.
For cables which are not individually screened, each core should be tested
to earth with the other cores at earth potential. Results should be in the
high Meg-ohms. These test should be for 1 minute.
5.9.4 Cable Test Voltage after Insulation
Voltage
Designation kV
Belted Cables
Between
Conductors kV
0.6/1
1.9/3.3
3.8/6.6
6.35/11
3.5
10
20
34
Between any
Conductor &
Shealth kV
3.5
7.0
15.0
25
Single Cores &
Screened Cables
Between any
Conductor &
Sheath kV
3.5
7.0
15.0
25.0
NOTE: 1) Testing time of each core should be 15 minutes per core
2) For each repeat Hi-Pot Test, carried out on the same cable, reduce
voltage by 20%.
3) AS 1026 impregnated paper insulated cables
4) AS 1429 Polymeric Insulated cables up to 19/33kV (XLPE)
5.9.5 Safety Warnings
(a) Make sure, cable clearances are followed, Eg: Core to core clearance,
and core to earth are far enough apart to stop flash over during HV
Tests.
(b) Place danger sings at both ends of cable, warning Personnel of High
Voltage testing.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
(c) Place barriers around both ends of cable preventing Personnel from
entering test area.
(d) If cables is in a situation where Personnel could come in contact with it,
or if it would be safer to have someone at the open end, do so.
(e) Take time in carrying out test, as High Voltage test sets have the
potential to KILL.
(f) Always discharge cables after each test.
5.10
Hi-Pot Testing using Biddle Hi-Pot Test Set
Cable testing as per AS 1026 & AS 1429
5.10.1 Insulation test of cable (Before)
For a XLPE cable which is individually screened, each core should be
tested between screen and core. Results should be in the high Meg-ohms.
Each test should be for 1 minute.
For cables which are not individually screened, each core should be tested
to earth with the other cores at earth potential. Results should be the high
Meg-ohms. Each test should be for 1 minute. The above test should be
carried out using test report number -------.
5.10.2 HV Test
(a) XLPE Individually Screened Cables
Connect HV probe to cable. With foot switch in position and depressed,
set dial to zero, this allows HV to be energized. Turn dial clockwise,
observing kV and mili-amp meters, until required voltage is reached.
Carry out test to all three cores individually. After each test discharge
cores using discharge stick.
(b) Unbelted Cables
Connect HV probe to core. Short other cores to earth. With foot switch
in position and depressed, set dial to zero, this allows HV to be
energized. Turn dial clockwise observing kV and milli-amps meters,
until required voltage is reached. Carry out test to all three cores
individually. After each test discharge cores using discharge stick.
NOTE: FOLLOW WARNING GIVEN ON TESTING
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.10.3 Insulation Test of Cables (After)
For a XLPE cable which is individually screened each core should be tested
between screen and core. Results should be in the high Meg-ohms. This
test should be for 1 minute.
For cables which are not individually screened each core should be tested
to earth with the other cores at earth potential. Result should be in the high
Meg-ohms. This test should be for 1 minute.
5.10.4 Cable Test Voltage after Installation
Voltage
Designation kV
Belted Cables
Between
Conductors kV
0.6/1
1.9/3.3
3.8/6.6
6.35/11
11/11
12.7/22
19/33
Note:
3.5
10
20
34
34
-
Between any
Conductor &
Shealth kV
3.5
7.0
15.0
25
34.0
50.0
75.0
Single Cores &
Screened Cables
Between any
Conductor &
Sheath kV
3.5
7.0
15.0
25.0
34.0
50.0
75.0
1. Testing time of each core should be 15 minutes per core.
2. For each repeat Hi-Pot test carried out on the same cable reduce
voltage 20%.
3. AS 1026 impregnated paper insulated cables.
4. AS 1429 Polymeric insulated cables up to 19.33 kV (XLPE)
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.10.5 Safety Warnings
(a) Make sure cable clearance are followed. Eg: Core to core clearances,
and core to earth are far enough apart to stop flash over during HV
tests.
(b) Place Danger signs at both ends of cable warning Personal of High
Voltage testing.
(c) Place barriers around both ends of cable, preventing Personal form
entering test area.
(d) If cable is in a situation were Personnel could come in contract with it,
or if it would be safer to have someone at the open end, do so. Take
your time in carrying out test as High Voltage test sets have the
potential to KILL.
5.11
Earth Resistance Test (ET5) To AS3000
5.11.1 Normal Method of Test
Join terminal C1 an dP1 together connecting a lead to the electrode under
test. The length of this lead should be kept to a minimum, as this will affect
the electrode. P2 lead can be connected to electrode which should be
between 15 and 25m from test point. C2 lead can be connected to an
electrode 15 to 25 meters away form P2. This must be kept in a line so P2
can pick up the volt drop between electrode under test (C1) and C2.
5.11.2 Fall of Potential Method
Join terminals C1 and P1 together connecting a lead to the electrode under
test. The length of this lead should be kept to a minimum, as this will affect
the electrode resistance. Lead resistance can be deducted by running two
leads for P1 and C1 to the electrode. P2 connection to spike should be 25m
away from electrode under test. C2 should then be placed 25m from P2 in
a straight line. After a test has been carried out at this point P2 should be
moved about 3m either side of centre. If the first resistance is the same as
the first reading, or close to it. The mean value is used as the earth
resistance. If the readings are completely difference then the test using the
62 feet and 100 feet should apply.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.11.3 The 62% Rule for Single Earth Systems
It is normal, to carry out the measurement of electrode resistance by full of
potential method! The 62% Rule involves positioning of potential spikes P
and C at intervals of 62 feet and 100 feet. Connecting cables to earth tester
to complete the current and voltage under test. To obtain a true reading,
the current spike must be correctly placed in line with electrode under test.
Since both electrode under test and C2 must be sufficiently apart to stop
resistance are of both spikes overlapping.
Graphically it can be demonstrated that:
The true resistance of the electrode to be tested is equal to the measured
resistance when the potential electrode is at a distance from the electrode.
This should be equal to 62% of the distance from the earth electrode to the
current electrode C2.
NOTE: This rule can only apply when all electrodes are in line and the earth
is a single electrode, pipe or plate.
5.11.4 Test Procedure
(a) Check battery condition before leaving workshop.
(b) Connect instrument for test required as explained on previous pages.
(c) Set range switch to X1 and resistor dial to 010 (eg 10 ohms).
(d) Press the test button and watch galvanometer movement.
(e) If the deflection is (+) increase resistor dial to provide more resistance
until pointer comes back to the center. Increase range switch if needed,
(eg X10).
(f) If the deflection is (-) decrease resistor dial to reduce resistance, until
pointer comes back to the center. Reduce range switch if required, (eg
X0-01).
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
(g) Resistance measured is reading on dials x range factor.
NOTE: Australian Standards required as follows:
(a) earthing HV and LV AS3000
Section 8.12
(b) Lighting protection systems AS1768
Section 3.11
5.11.5 Safety Precautions
All personnel involved in testing, should be warned of the voltage that can
be generated by earth tester.
The maximum voltage can be up to 200 bolts AC.
5.12
Ducter Testing (Switch Gear)
5.12.1 Connect load to Ducter test set, BLACK on the outer side and RED on the
inner. Select scale required, either micro-ohms or milli-ohms. Place probe
on busbar under test keeping the ‘P’ on probe on the inside while testing.
Wait until the reading settles then record on ____ test sheet.
5.12.2 Where applicable, results recorded should be checked against
manufacturers specification (if available). All phases should be within 30-40
micro-ohms. Some judgment by the testing technician may be required
under circumstances. Eg. Busbar, lengths are different Switch gear. This
may alter results over three phases up to 30%.
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.13
BLOCK DIAGRAM OF COMMISSIONING HV SWITCH YARD
Polarity
Test to
CT's
Ratio
Test to
CT's
Magnetisation
Curves to
CT's
Polarity
Test to
VT
Set
Protection
Scheme
Secondary Injection
Ducter Test
to
Connections
Ducter Test
to C.B.
to Protection
Relays
Ratio
Test to
VT
(Bus Bars)
Tester
Injections
Volts/Amps
5.14
Function
Test to
Circuit Breakers
Energise
Switch yard
if required
Phase
Rotation
BLOCK DIAGRAM OF COMMISSIONING HV SWITCH BOARDS
Polarity
Test to
CT's
Ratio
Test to
CT's
Magnetisation
Curves to
CT's
Polarity
Test to
VT
Ratio
Test to
VT
Secondary
Injection to
Protection
Scheme
Ducter Test
to Switchboard
Connections
Ducter Test
to Circuit
Breakers
Meter
Injection
Volts/Amps
Insulation
Megger Test
to VT's
Function
Test to
Circuit
Breakers
Hi-Pot
Switchboard
Hi-Pot
Circuit
Breakers
Energise
Switchboards
Phase
Rotation
if required
Set
Protection
Scheme
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
5.15
MIDOS Relay Types
MAVS
MBCH
MBC1
MBC2
MCAG
MCAG
MCAG
MCGG
MCHD
MCHG
MCHN
MCND
MCRI
MCSU
MCTD
MCTH
MCT1
MGT1
MFAC
MFVU21
MHO1204
MRSUO1
MRTP
MSTZ02
MSTZ03
MSTZ81
MVAA
MVAJ
MVAW
MVAX
MVGC
MVTC
MVTD
MVTP
MVTRO1
MVTR51
MVTR52
MVTT14
Check synchronising relay
Biases differential protection
Translay ‘S’ differential feeder protection
Low impedance over-current relays
11, 12 instantaneous over-current relays
14 high stability circulating current delay
19, 39 instantaneous over-current and earth fault relay
Over-current relays for phase and earth faults
Thermal replica relay
Motor protection relay
Motor protection relay
Negative sequence over-current relay
Instantaneous over-current relay
Sensitive earth fault relay
Silicon rectifier and filter protection relay
Transformer current inrush detector
Local breaker back-up relay
Single pole directional relay
High impedance differential relay
Digital definite time frequency relay
High speed pilot wire protection
Rotor earth fault protection relay
Supervision for AC pilot circuits
Power supply unit (DC/AC converter)
Power supply unit
Power supply unit (current operated)
Tripping and auxiliary relays
Tripping and control relays
Interposing relay
Trip circuit supervision relay
Static voltage regulating control relay
Inspection alarm and maintenance lockout relay
Inverse time delayed voltage relay
Bus bar supervision relay
Auto re-close relay
Multi shot auto re-close relay
Multi shot auto re-close relay
15 digital time delay relays
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
MVTU
MVTW
MVUA
MWTU01
MYTU
MZTU
5.16
Define time delay voltage relays
Destablising/inter-tripping relays
Time delayed auxiliary and tripping relays
Reverse power relay
Field failure relay
Under impedance relay
COMMISSIONING CHECK LIST
SWITCHBOARD HV/MV :
LOCATION:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
YES
NO
YES
NO
Polarity test to current transformers
Ratio test to current transformers
Magnetisation curves to current transformers
Polarity test to voltage transformers
Ratio test to voltage transformers
Set all protection relays
Secondary injection of all protection relays
Ducter test all connections (bus bar joints, etc)
Ducter test all circuit breakers with breakers closed
Secondary injection to prove metering
High Pot Switchboard
High Pot Circuit breakers
Energise Switchboard
Phase Rotation if required
SWITCH YARD HV :
LOCATION:
1.
2.
3.
4.
5.
6.
7.
8.
Polarity test to CT’s
Ratio test to CT’s
Magnetisation curves to current transformers
Polarity test to voltage transformers
Ratio test to voltage transformers
Set protection scheme (relay settings)
Secondary injection of protection relays
Ducter test to bus bars and connections
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
YES
9.
10.
11.
12.
6.0
NO
Ducter test to bus bars and connections
Secondary injection to prove metering
Function test to circuit breaker
Energise switch yard and carry out phase rotation
QUALITY RECORDS
DOCUMENT SITE AMENDMENT
Form
Description of Quality Record
Filing
Location System
Archives
Retention
Responsible
Person
no
Oil Dielectric Strength Test Record
QC/DC
no
Cable Tray Inspection Check List
QC/DC
no
Cable Pulling Inspection Check List
QC/DC
no
QC/DC
no
Megger Readings (Power, Control
Wire & Cable)
Megger Readings (Elect. Equipment
Incl. Motors)
Insulating Resistance Test Records
(Rotation)
Ground well Resistance Readings
no
Megger Reading (Transformer)
QC/DC
no
Switchgear Inspection Record
QC/DC
no
380V Switch Board Inspection
Record
Motor Control Center Inspection
Record
Liquid Filled TR. Inspection Check
List
Pre-Commissioning
of
Power
Transformer
Neutral
Grounding
Resistor
Inspection Record
Battery & Battery Charger & UPS
Inspection Record
Replacement of Field Control
Station Test Record
Internal Lighting Check Sheet
QC/DC
no
no
no
no
no
no
no
no
no
QC/DC
QC/DC
QC/DC
QC/DC
QC/DC
QC/DC
QC/DC
QC/DC
QC/DC
QC/DC
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
DOCUMENT SITE AMENDMENT
Form
no
Description of Quality Record
Filing
Location System
Archives
Retention
Responsible
Person
QC/DC
no
Underground Conduit Inspection
Check List
Above Ground Conduit Inspection
Check List
Overall Completion of Earthing Grid
no
Earthing Riser Layout
QC/DC
no
Earthing Wire Layout
QC/DC
no
Cadweld Connection of Earth Grid
Wire
QC/DC
no
QC/DC
QC/DC
Work Instruction Process for Inspection, Testing & Commissioning
of Electrical Switch Board & Switch Yard
HIGH VOLTAGE CABLE TESTING
Contract Title
Cable No.
Project No.
From
Location
To
Drum No.
Test
Connection
Voltage Rating
Drum Test Insulation
Test Volts
kV
Post Laying Insulation
Reading
MW
Test Volts
kV
Reading
MW
R-YBE
Y-RBE
B-RYE
E-RYB
Tested By
Tested By
Date
Date
Certified By
Accepted By
Certified By
Accepted By
Dielectric Test (After termination kit fitted)
Test
Connection
INSULATION
Test Volts
Reading
kV
M
Applied
Pressure
kV
Time
Seconds
Leakage
Current m
Amps
INSULATION
Test Volts
Reading
kV
M
R-YBE
Y-RBE
B-RYE
E-RYB
Cable Continuity Checked
YES/NO
Cable Polarity Checked
YES/NO
Connection Polarity Checked and Correct
YES/NO
Connection Bolts Torque Checked
YES/NO
(Delete whichever is not applicable)
REMARKS
R = Red, Y = Yellow, B = Black
TESTED BY
DATE
CERTIFIED BY
ACCEPTED BY
_________________
Client