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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music
CONTENT SHEET
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.
CONTENT NO 1.0 2.0 2.1 2.2 3.0 4.0 5.0 6.0 6.1 6.2 7.0 7.1 7.2 8.0
15.
8.1
16. 17.
8.2 8.3
18.
8.4
Sr. No
DESCRIPTION
PURPOSE PRE-REQUISITES REQUIREMENT OF OTHER SYSTEM SYSTEM REQUIREMENTS MANPOWER REQUIREMENTS REQUIREMENTS OF INSTRUMENTS HAZARDS AND PRECAUTIONS GENERAL METHODS INSTALLATION CHECKS ON SWITCHYARD INSTALLATION CHECKS ON BUS DUCTS( If applicable ) CABLING AND CONNECTION CHECKS: HT CABLE : (IF APPLICABLE) CABLING CHECKS : FEEDER BREAKER CHECKS A. INTERNAL WIRING CHECKS i) TRIP – 1 CIRCUIT CHECKS ii) TRIP – 2 CIRCUIT CHECKS ( IF APPLICABLE) iii) ANNUNCIATOR CHECKS (IF APPLICABLE) iv) TESTING OF SCHEMES AND INTERLOCKS TESTING OF CIRCUIT BREAKER 1. PHYSICAL CHECKS 2. IR & HV CHECKS 3. CHECKS FOR HEALTHINESS OF VACUUM IN INTERRUPTER(IF APPLICABLE) 4. CONTACT RESISTANCE TEST 5. TESTS ON CB COILS 6. ANTI PUMPING, TRIP FREE FEATURE, OPERATION TIME, MINIMUM PICK UP VOLTAGE OF COILS & DUTY CYCLE TEST TESTING OF RELAYS CHECK ON CT PARAMETERS Sign up to vote on this title i) PRIMARY INJECTION CHECKS WITH BURDENS CONNECTED TO CT Useful Not useful TESTING OF POTENTIAL TRANSFORMERS i) PHYSICAL CHECKS ii) CHECKS ON PT PARAMETER
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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music
1.0
PURPOSE:
This procedure is prepared for carrying out the commissioning checks, energisation and energisation checks on 11KV, 33KV ,110KV , 220KV & 400KV Switchyard.
2.0 2.1
PRE-REQUISITES: REQUIREMENT OF OTHER SYSTEM:
1. The incoming supply to the Switchyard whether is Transmission Line is made through and sho made ready. 2. Auxiliary supply AC 230V & DC (220V/ 110V) power supply for protection & operation commissioned and is available. 2.2
SYSTEM REQUIREMENTS:
1. Erection of Switchyard is successfully completed. 2. Installation and wiring of Switchyard is completed as per approved drawings and clearance certifi obtained from elect (const). 3. Installation related checks are completed. 4. Power & control cabling up to Switchyard is completed. 5. Illumination is available on a permanent basis. 6. Equipments and structures are connected to earth 7. 3 phase 415 V power supply is available for testing You're Reading a Preview 8. Relevant drawings, documents, approved settings of relays are available. 9. Relay configuration should be made to the system Unlockaccording full access with a free trial. requirement. Relay setting calcu need to be done prior to commissioning and reference document needs to be referred. 10. Check whether SF 6 gas is filled for the Circuit Breaker
3.0
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MANPOWER REQUIREMENTS:
1. M/S VOLTECH : i. Senior Engineer - 1 ii. Junior Engineer – 1 2. From Customer : Sign up to vote on this title i. Workmen (electrician) – 1 (Tool kit with all necessary tools and torque wrench) ii. Workmen (Helper) – 1 Useful Not useful 3. Witness : i. Engineer – 1
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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music
All above testing instruments shall be checked for suitability with respect to calibration certificates an of last calibration.
5.0
HAZARDS AND PRECAUTIONS:
1. Unauthorized persons should not be allowed to enter Switchyard. 2. Ensure danger plates are provided at the Switchyard for the Bays which are energized and ribbon tag is made. 3. Ensure while testing or energisation that all required electrical clearances are as per specifications 4. Adequate illumination must be maintained in Switchyard. 5. Ensure that Switchyard is clean. 6. Ensure that no CT secondary is left open circuited during testing. 7. Ensure that no earthing or discharge rod is left connected and that they are cleared before charg 8. Confirm the relative polarities of line PT and bus PT.
6.0
GENERAL METHODS:
6.1
INSTALLATION CHECKS ON SWITCHYARD
1. Check the rating and diagram nameplate details are as per that on the drawing (________). 2. Check that the Switchyard is installed completely as per the GA drawing (__________). Note pending points relating to installation if any. You're Reading a Preview 3. All enclosures and metal parts are earthed after equipment installation 4. Check that control and power interfacing is completed Unlock fullcabling access with a free trial.as per design / drawing. 5. Ensure free access is available to all points of installed equipments and especially to points req frequent operations, maintenance and control. Download With Free Trial 6. No unwanted tools tackles, equipments are left nearby. 7.0
CABLING AND CONNECTION CHECKS:
7.2
CABLING CHECKS :
1. Check that external power and control cables are laid and terminated. Sign up toclamped vote on and this glanded. title 2. Check that the cables for Switchyard are well dressed, supported, 3. Check for continuity, correct ferruling, lugging, connection tightness, Notvalue usefulof all external Useful IR connected at and also that they are connected as per approved interconnection schedule. 4. Spare CT secondary terminals are to be shorted and earthed.
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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music
d. Check the tripping from all other protections / interlocks as per the circuit given in the s drawing. ii.
TRIP – 2 CIRCUIT CHECKS ( IF APPLICABLE)
a. b. c. d.
iii.
Check the operation of CB with DC supply connected to only trip coil 2. Check the tripping of CB from local and remote control switch. Check the tripping of CB by initiating protection relays. Check the tripping from all other protections / interlocks as per the circuit given in the s drawing.
ANNUNCIATOR CHECKS (IF APPLICABLE)
a. Check the operation of local annunciator by initiating alarm/trip relays manually. b. Annunciation shall be checked as per control schematic or annunciation provided room covering all annunciations. iv.
TESTING OF SCHEMES AND INTERLOCKS
a. All the electrical & mechanical safety interlocks of the Switchyard shall be checked as p approved scheme and Switchyard instruction manual for operation and maintenance. b. Check all the protection interlocks as per the specifications and schematic drawings.
8.1
TESTING OF CIRCUIT BREAKER
You're Reading a Preview
1.
PHYSICAL CHECKS
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a. Inspect the CB for any physical damage. b. Check for cleanliness of all the insulators with dry cloth. 2.
IR CHECKS
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a) Conduct IR test at 5 KV on CB in closed and open condition. 3.
CHECKS FOR HEALTHINESS OF SF6 GAS (IF APPLICABLE)
a) Check the pressure gauge and ensure SF6 gasSign is inupthe required safe to vote on this titlelevel (green m portion).
4.
CONTACT RESISTANCE TEST
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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music
close command is present. Now release the close PB and then again press it, the CB now. Hence it is checked that the anti- pumping feature is operating.
b) Check the trip free feature of the breaker. c) Using breaker timing test kit take time measurement test on the CB. Connect the leads o & B phase from the kit across the CB contacts. Close the CB and record the closing time & B phase. Similarly trip the CB and note down the opening times of CB for all phases.
8.2
TESTING OF RELAYS
a) Check the tightness of the wire connection for the rear side of the relay. b) Check that the relay has been configured has per system requirement if its numerical rela c) Check the relay by using relay test kit and check the tripping of breaker during seco injection of current.
8.3
CHECK ON CT PARAMETERS
a) Take the insulation resistance of the CT secondary windings with respect to earth and be windings using 500v or 1000v megger b) Using the multimeter in the ohmmeter mode measure the secondary winding resistance o c) Using a galvanometer, check that positive direction kick is induced between s1 to s2 te when a positive current pulse through battery is applied between P1(+VE) to P2 (-VE) d) Knee Point voltage test (for PS class only): Using a 1 phase variac connected to a st transformer(if required);You're apply increasing across the CT secondary winding. No Reading avoltages Preview voltage applied and the current flowing into the CT secondary at each step of increase voltage. Voltage increase may full be access in steps of a25v the output of step up transformer or Unlock with free at trial. . When an increase in the current by 50% is observed for an increase in the voltage by 50%, V knee is said to have been reached. With Free e) Using a primary injectionDownload test kit (secondaries of Trial the CT shorted at the TB), inject rated p currents into the P1 & P2 terminals. Measure these currents and those flowing out secondary terminals. Tabulate the readings. Calculate the ratio and compare wit nameplate ratio f) Spare secondary terminals of the CT shall be shorted across and earthed. ii) PRIMARY INJECTION CHECKS WITH BURDENS CONNECTED TO CT
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a) After ensuring that the CT secondaries are connected to burdens arrange usefulfor primary inj Useful Not The induced currents flowing from secondaries to burdens are noted for correctness scheme.
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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music
b) Conduct ratio test by applying with 1 phase 240v across the primary or 415v across p (RYB). Note voltage at secondary. Tabulate and compare the values with the nameplate valu
3.
VOLTAGE INJECTION CHECKS AT PT SECONDARY WITH BURDENS CONNECTED
a) Disconnect external wiring at PT secondary terminals. Ensure all PT secondary burde connected as per scheme b) Inject rated phase to earth voltage at the disconnected secondary wires using a variac, one at a time. Check the availability of voltage at burdens as per the scheme.
9.0
ENERGISATION PROCEDURE
1. Ensure that all the protection scheme and relays are checked and their setting is done as pe coordination and setting chart. 2. Keep all the out going CBs of Switchyards in racked out condition. 3. Reset all the relays and note the position of flag in dication of relays is as per scheme. 4. Check that the incoming voltage and frequency is OK. 5. Close the incomer CB of the Switchyard. 6. The Switchyard bus is energized. Check the voltage of the bus for each phase by operating se switch. Check for any abnormality or noise in the Switchyard.
10.0
A
WORK PLANS
You're Reading a Preview
A Unlock full access with a free trial. CHECK THE STATUS OF OTHER SYSTEMS LIKE CHECK FOR COMPLETENESS AND CORRECTNES TRANSMISSION LINE, AND CONTROL AC/ DC OF POWER CIRCUIT OF THE SWITCHYARD Download With Free Trial WITH RESPECT TO APPROVED DRAWING AND PHASE SEQUENCE. CHECK & CONFIRM FOR THE AVAILABILITY OF MANPOWER
IDENTIFY THE HAZARDS AND TAKE NECESSARY PRECAUTIONS , ARRANGE FOR DANGER PLATES IF REQUIRED
CHECK THE WORKING OF AC AUXILIARY CIRCUIT INCLUDING SPACE HEATERS, CUBICLE ILLUMINATION & SOCKET OUTLET
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CHECK THAT SWITCHYARD EARTHIN G IS CONTINUOUS AND IS CONNECTED TO STATION
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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music CHECK THAT COMPONENTS MOUNTED ON SWITCHYARD ARE AS PER APPROVED BILL OF MATERIAL & FEEDER NAME PLATE & RATINGS
PERFORM ELECTRICAL TESTING OF METERS
B A
B
CHECK THE WORKING OF SPACE HEATERS OF BUS DUCTS
CHECK THE INTERNAL WIRING OF THE SWITCHYARD
PERFORM LOGIC AND FUNCTIONAL TESTING OF THE SWITCHYARD SCHEMES AND PROTECTION INTERLOCKS
You're Reading a Preview
PERFORM ELECTRICAL & MECHANICAL CHECKS ON CIRCUIT BREAKER AS LISTED IN Unlock full access with a free trial. PROCEDURE
Download With Free Trial TAKE NECESSARY PRECAUTIONS AND PERFORM HV & IR TESTING OF SWITCHYARD AND BUS DUCTS INTERLOCKS
SET ALL THE RELAYS AS PER RELAY SETTING SHEET
CHECK THAT ALL CT SECONDARIES ARE
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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music ENERGISE THE SWITCHYARD AS PER APPROVED PROCEDURE
11.0 Sl no
FINAL CHECK LIST Description of final check
Status
1
Status of other systems are checked
2
All test reports are checked and verified
3
Hazards and precautions are adhered to.
4
No CT secondary is left open circuited
5
Relative polarity of line and bus PTs are checked and are found correct
6
Check that any erection or testing related deficiency is attended or if not critical, it is noted. Check that all contact resistance of bus bar joints in the Switchyard and bus duct are measured and are found acceptable Check that earthing of Switchyard and bus duct are completed as per You're Reading a Preview earthing drawing and it is connected to station earth grid Check that HV and IR tests on the bus bar of Switchyard and bus duct full access with a free trial. are conducted and the resultsUnlock are acceptable. Check that clearance between phases and between phase to earth of the bus bars in Switchyard and bus duct isWith checked. Download Free Trial Ensure that no tool or tackle is left behind inside the bus duct, this is to be ensured each time any inspection cover is opened and closed back
7 8 9 10 11
12 13 14 15
Ensure test on CB trip, close & spring charge motor coils is performed and the results are acceptable CB trip and close timings in the specified control voltage range are checked and are found acceptable Sign up to vote on this title CB is correctly interlocked from other systems for its closing/opening Useful Not useful
Other equipments/systems are correctly interlocked from CB for their closing/opening
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VOLTECH ENGINEERS PVT. LTD
COMMISSIONING OF SWITCHYARD Procedure No: VE / MAS /
Sheet Music
21
Ensure that testing of all DC auxiliary relays are completed and results are acceptable
Sl. no
Description of final check
Status
22
Ensure that testing of all tripping relays are completed and results are acceptable
23
Ensure that testing of all meters are completed and results are acceptable
24
Ensure that testing of all meters are completed and results are acceptable
25
Ensure that scheme checks are completed as per scheme
26
Ensure that all interlocks are checked as per scheme for incomers
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