ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 5
PLANT AREA: HT BREAKER
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________
NO.
ACTIVITY
REMARKS
GENERAL INSPECTION AND CHECKS
1.
Check that the poles are securely maunted/assembled
2.
HV Connections made properly.
3.
Control cables laid up and connected as per scheme.
4.
Breaker body and structure properly earthed.
5.
Check that panel is clean and dry.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 5
PLANT AREA: HT BREAKER
TAG NO.
UNIT
NO.
6.
ACTIVITY
REMARKS
Check that all the devices fitted in the breakers are a. b. c. d.
as specified in the schedule complete and undamaged Securely mounted Free from packing materials applied during transit.
7.
Chec Check k that that all all equi equipm pmen ents ts and and part parts s of the the pane panell are are effectively grounded.
8.
Check that all the power & control cables are properly dressed and supported.
9.
Check Check that that incomi incoming ng power power cable cable phase phase marki markings ngs and busbar busbar phase marki marking ngs s are in agreem agreement ent for both both the incoming supplies.
10.
Check the tightness of all the electrical connections.
11
Check the protection relay connections as per drawing. Also, no relay is found physically damaged and no relay cove coverr is foun found, d, brok broken en.. Rela Relay y roto rotorr lock lock is give given n for for transport transportation ation is released released in case of electrom electromecha echanica nicall relays.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 5
PLANT AREA: HT BREAKER
TAG NO.
UNIT
NO.
6.
ACTIVITY
REMARKS
Check that all the devices fitted in the breakers are a. b. c. d.
as specified in the schedule complete and undamaged Securely mounted Free from packing materials applied during transit.
7.
Chec Check k that that all all equi equipm pmen ents ts and and part parts s of the the pane panell are are effectively grounded.
8.
Check that all the power & control cables are properly dressed and supported.
9.
Check Check that that incomi incoming ng power power cable cable phase phase marki markings ngs and busbar busbar phase marki marking ngs s are in agreem agreement ent for both both the incoming supplies.
10.
Check the tightness of all the electrical connections.
11
Check the protection relay connections as per drawing. Also, no relay is found physically damaged and no relay cove coverr is foun found, d, brok broken en.. Rela Relay y roto rotorr lock lock is give given n for for transport transportation ation is released released in case of electrom electromecha echanica nicall relays.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 3 OF 5
PLANT AREA: HT BREAKER
TAG NO.
UNIT
NO.
ACTIVITY
REMARKS
12
Check the Breaker mechanism as per manufactures instruction.
13
Check the operation of reset levers in case of manual reset relays is found OK.
14
Check that the spring charging circuit, closing & tripping circuit are wired as per wiring diagram
15
Check that the illumination & space heater circuit are OK.
16
Check that clearance between HT Panel & wall as per IS specification.
17
Check that the door is properly closed before testing.
18
Check the breaker auxiliary contacts are OK by manual operations.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 4 OF 5
PLANT AREA: HT BREAKER
TAG NO.
UNIT
ACTIVITY
1
TEST PROCEDURE
Check the Insulation Resistance of poles use megger 2500v for 3.3 KV & above rating or as specified by manufaciner. Measured between
IR
Temp
R -- E Y -- E B -- E R -- Y Y -- B B -- R R–R Y -- Y B -- B
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
Remarks
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 5 OF 5
PLANT AREA: HT BREAKER
TAG NO.
UNIT
ACTIVITY
2
Contact Resistance Measurement using Micro-ohm meter in Breaker closed condition. R–R Y–Y B-B
3
Breaker closing and opening time During Closing
Time
R Y B During Opening R Y B 4
Breaker closing & Tripping operation from local, Remote & Protection. Defective & Omission Continuation Overleaf
REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 2
PLANT AREA : NEUTRAL GROUNDING TRANSFORMER
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________ ACTIVITY GENERAL INSPECTION AND CHECKS,
1
Check that the cubicle is properly installed on foundation.
2
Check that the cubicle is earthed at two places.
3
Check that the connection from N.G.Transformer to Gen.Tr. neutral is complete.
4
Connection to earth from N.G. Tr. Is complete.
5
All control cables laid, & terminated as per scheme.
6
Check that the CT / PT ratio & polarity and verify with scheme.
7
Check that all the connections are tight.
8
Check the auxiliary contacts from NGT to control room & control & protection panels are OK.
9
Check that the 100% earthfault protection is connected across the secondary of NGT. Defective & Omission Continuation Overleaf
REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 2
PLANT AREA : NEUTRAL GROUNDING TRANSFORMER
TAG NO.
UNIT
ACTIVITY TEST PROCEDURE
1
IR value of N.G. Transformer Temp. Py – E Sy – E Py – Sy Measured with ----------------------------- megger.
2
Winding Resistance Temp. Py
:
Sy
:
Measured with Micro-ohm meter.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 3
PLANT AREA : PT CARRIAGE & CUBICLE
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________
ACTIVITY GENERAL INSPECTION AND CHECKS,
1
Check that the PT securely bolted to structure
2 3
Check that the PT body & structure earthed at two places
4
Check that the LT cables kid, terminated as per scheme.
5
Check that the Bushings cleaned and, on visual inspection, no defect detected.
6
Check that view glasses are not broken & clean to see PT connection from outside.
Check that the HT leads connected properly
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 3
PLANT AREA : PT CARRIAGE & CUBICLE
TAG NO.
UNIT
ACTIVITY
7
8
Check that the carriage & cibicle is clean & dry.
Check that the carriage is moving freely without any obstructions and in position it is making proper contact with HT Bus. Check that all MCBs provided in the circuit are OK.
9
Check that the HT fuse is seated properly and making proper contact.
10
Check for proper operation of limit switches to give output while PTs are in service.
11
Check illumination circuit as per the schematic diagram given.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 3 OF 3
PLANT AREA : PT CARRIAGE & CUBICLE
TAG NO.
UNIT
ACTIVITY TEST PROCEDURE
1.0
The IR value of PT measurement ust & 2500v megger for HT side & 500v megger for sec. Side. Phase ‘R’
Phase ‘Y’
Phase ‘B’
Py – E Sec – E Py – Sec
2.0
IR value of Control Cable
3.0
Secondary Winding Ressistance Phase
Resistance
Temperature
Remarks
R Y B
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL
DATE
SIGNATURE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 5
PLANT AREA : BUS DUCT
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________
ACTIVITY GENERAL INSPECTION AND CHECKS
1
2
Check that the Bus duct erected properly with supporting structure and Insulator.
Check that the Busduct aligned properly.
3
Check that the Seal off bushings are fixed properly and both end connections are complete.
4
Check that the fiexible connectors are as per specification and fixed properly.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 5
PLANT AREA : BUS DUCT
TAG NO.
UNIT
ACTIVITY
5
Check that the Bus enclosures properly earthed as per drawing
6
Check that the CT’s PT’s are mounted properly, and Insulators securely bolted to mounting channels. No crack can be viewed in insulators at CTs & PTs
7
Check that the secondary connections of PT’s / CT’s are complete as per drawing
8
Check that the Bus duct is clean and dry.
9
All joints are checked for tightness as per recommendations.
10
Check that the insulators are cleaned.
11
Check that the clearance between Bus duct & busbaland casing are within the available limit.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 3 OF 5
PLANT AREA : BUS DUCT
TAG NO.
UNIT
ACTIVITY
TEST PROCEDURE
1
Disconnect both end connections and measure insulation resistance. (Use megger as per manufacturer’s recommendation) IR measured between
Value
Temp.
Remarks
R –E Y-E B-E R-Y Y-B B-R
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 4 OF 5
PLANT AREA : BUS DUCT
TAG NO.
UNIT
ACTIVITY
2
Measurement contact resistance of 10% of joints Joint No.
3
Value
Remarks
Loop Resistance Short two phases of one end and measure resistance of the loop with low resistance measuring bridge. Short the third phase with any other phase and measure the resistance similarly. Evalvate Resistance per ph. Loop between
Loop Resistance
Resistance/ phase
Remarks
R–Y Y–B B -- R
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 5 OF 5
PLANT AREA : BUS DUCT
TAG NO.
UNIT
ACTIVITY
4
High Voltage Test This test is to be carried out after completion of all other commng. Checks so that the Busbar is not distorbed further. Fquipments connected to the Busbers are to removed and during test all other phases are to be shorted & earthed. Test Voltage is as recommended by Manufacturers. Phase under Test
Test Voltage
Leakage Current
Test Duration
Remarks
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 3
PLANT AREA : GENERATOR CIRCUIT BREAKER
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : ________________________________________ NO.
ACTIVITY
REMARKS
1.0
ENERGISING OF AUXILIARY CIRCUITS
1.1
Before the auxiliary circuits are energised, make sure that the external connections comply with the wiring diagram and that the supply voltages are actually those required by the characteristics of the relays and electrovalves referred to on the nameplate of the breaker.
2.0
FILLING WITH COMPRESSED AIR
2.1
Very first, that there are no substantial leaks by pressurising the breaker to a reduced pressure of 8 to 10 bars (110 to 150 psig).
2.2
Proceed to filling, respecting the following instructions.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 3
PLANT AREA : GENERATOR CIRCUIT BREAKER
TAG NO.
UNIT
ACTIVITY
2.2
Proceed to refilling, respecting the following instructions.
2.3
Isolate the H.P. receiver from the compressors, and energize the reducing electrovalve: Pressure stabilizes at intermediate pressure.
2.4
Isolate the C.B. from H.P. receiver, then return to nominal pressure in H.P.receiver by starting compressors.
2.5
Proceed as in 2.2.2, until nominal pressure is reached in the C.B.
3.0
INSPECTION OF PRESSURE SWITCHES, REDUCERS AND SAFETY VALVES
3.1
Refer to the operating pressure levels on the relevant pneumatic diagram. Adjust the pressure through the main valves of the installation and make certain, by reading the pressure gauges, that the operating pressure of each pneumatic component is correct. The pressure switches must be checked on lowering pressure as well as on rising pressure.
3.2
Check the logic sequence of the operating pressure level.
3.3
Check the proper operation of each motorcirculator as well as the condition of the motor supply wires. Defective & Omission Continuation Overleaf
REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 3 OF 3
PLANT AREA : GENERATOR CIRCUIT BREAKER
TAG NO.
UNIT
NO.
ACTIVITY
REMARKS
3.4
Check the rotation direction of the motors: an arrow painted on the case provides the relevant indication. Proceed as follows for this checking:
3.4a
Check the rotation direction through the hole left free. Checking is not easily carried out at full speed, it is recommended to proceed with this operation at low speed when the motor is no longer supplied and runs idle.
3.5
Check that resistance across each pole with breaker is closed.
3.6
CHECKING OF OPENING AND CLOSING TIMES
3.6a
Operating times can be checked more summarily before commissioning: only abnormal conditions resulting from assembling or transport need be detected.
3.6b
An oscillograph or graph recorder may be used. When these measurements are taken, the instant the electrovalve coils are energised must appear on a separate “track” as well as the time basis.
3.6c
Check the operating times, disconnect the ground connection (connection from main chamber to auxilliary chamber) (see Section entitled “Chamber”).
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 4
PLANT AREA: ESP AUX. CONTROL PANEL
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________
NO.
ACTIVITY
REMARKS
1.
Ensure that all breakers, PTs, modules installed in position and Bom as per drgs.
2.
Check that panel earthing connection as per standard.
3.
Ensure minimum clearance of live parts to earthed body as per standard.
4.
Ensure tightness of cable connection, main bus bar joints and auxiliary circuit bus bars.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 4
PLANT AREA: ESP AUX. CONTROL PANEL
NO.
ACTIVITY
REMARKS
5.
Check that internal panel wiring as per drawing check that the continuity of main bus bars & Aux bus bar.
6.
Check that IR Valve of power circuit with help of 1000V megger. The value should be above 2 Mr Phase to phase ……………….. Mr Phase to earth ………………. Mr
7.
Ensure that healthiness of Indication and Alarm as per drawings / schemes.
8.
Check the Healthiness of space heater.
9.
Carryout Primary injection test on Incomming CT and Randam test on Thermal over load relay of feeders.
10.
Measure IR Valve of incoming cable to panel and connect Properly to the incoming terminal.
11.
Check the incoming cable up to panel Terminal Block and measure the voltage.
12.
For conducting functional test of the panel out going terminal shall be disconnected and remove the power fuse and temporally short the themostot and Local PB.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 3 OF 4
PLANT AREA: ESP AUX. CONTROL PANEL
NO.
ACTIVITY
REMARKS
13.
Charge the panel and check the module function indication status and protection circuits as per logic envisaged in the system.
14.
Measure the control voltage all the modulus incoming and out going.
15.
Finally connect all out going cable, fix the power fuse and open the thermostat terminal & Local PB terminals.
16.
Set the sequential progremmer for the following way make a service of collecting rapping one at a time.
17.
Collecting and emitting rapping of same field do not come in operation at the same time.
18.
1 Minate set for operating a rapping motor – (both collating & emitting rapping system) make a complete chart of rapping sequence operation and affixed in the panel for reference.
19.
Measure the resistance of group of heater across all three phases and should be equal.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 4 OF 4
PLANT AREA: ESP AUX. CONTROL PANEL
NO.
ACTIVITY
REMARKS
20.
Check change over of contacts and resetting and finally set the thermostat to operate at 120 0C and reset at 105 0C.
21.
Check the module healthiness for Heater CKT in the panel and CT to ammeter connation and finally shorting on TB for CT terminal should be removed.
22.
Measure the current in all three phases by Tonque tester and compared with panel mounted ammeter read any.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 6
PLANT AREA: ELECTRIC CONTROLLER PANEL IN ESP
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________
NO.
ACTIVITY
REMARKS
1.
Ensure that the shield / screen of shield control cable and earth wire should be earthed at one point of cubicle.
2.
Disconnect the connector of Integrated controller shortwires.
3.
Group A. Short pay and Sec. Of aux. Transformer T1, T2 & T3. Earthing of one end of winding of above Transformer to be removed.
4.
Group B. 103,104 and line contact of “52” contactor.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 6
PLANT AREA: ELECTRIC CONTROLLER PANEL IN ESP
NO.
5.
ACTIVITY
REMARKS
Measure the insulation resistance with 500 Volt megger between group A & Earth E, B & E and between A & B it should be as follow A to E > 2 Mr A to B > 30 Mr B to E > 30 Mr
6.
Remove the shorting after insulation check and connect controller.
7.
Connect a load resistor of approximately 4A, 2000W, 500V at Terminal C & D of the panel.
8.
Connect supply 415 VAC across the Terminal A & B and close the isolator and check indication for mains on, display and flickering of processor health indication LED of controller.
9.
Check 24V AC at terminal 1 & 5 of TB2 wrt ground Check 18 VAC at across pin 1 & 2 of firing circuit.
10.
Check interlock key is in classed position
11.
Check voltage at various test point of the cards. (Disconncet the transformer from panel end switch on power supply) Defective & Omission Continuation Overleaf
REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 3 OF 6
PLANT AREA: ELECTRIC CONTROLLER PANEL IN ESP
NO.
ACTIVITY
REMARKS
12.
Check all the connections in the interfacing board with BAPCON Cable.
13.
Ensure that the power input to BAPCON and panel are in the same phase angle.
14.
Check all the auxiliary relays provided in the interfacting board are properly fixed.
15.
Check the thyrister Gate & Cathode lugs are properly inserter. i. Gate & Cathode signals should not be interchanged. II. Thyrister phase angle sequence should be maintained.
16.
Ensure all safety measures and preparations applicable to the ESP are performed.
17.
Remove the output cables leading to T/R set from the control panel.
18.
PUT the REMOTEL/LOCAL Switch in LOCAL mode.
19.
Switch ‘ON’ the main SFU.
20.
Check the whether following display appears momentarily.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 4 OF 6
PLANT AREA: ELECTRIC CONTROLLER PANEL IN ESP
NO.
ACTIVITY
REMARKS
21.
This display denotes the program version no. and revision no. of the BAPCON.
22.
Check whether the Alive LED flickers at contstant interval.
23.
Check whether all the control parameters are matching with defaultvalues, using the display select switches.
24.
Simulate T/R alarms and ALI alarm by momentarily by shorting the respective terminals in the control panel. Check whether the respective LEDs are glowing. Check whether the LED’s are extinguished by pressing RESET switch.
25.
Switch OFF the main SFU of the control panel.
26.
Connect two series connected 500W incandescent lamps across the output terminals of the panel.
27.
Connect a voltmeter (Range:0-500V AC) across the output terminals the panel.
28.
Turn the 1s Limit Pot meter to fully counter clockwise position.
29.
Switch on the main SFU of the control panel.
30.
Select the UV Limit Display and adjust the value to 104% using the Pot No.5.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 5 OF 6
PLANT AREA: ELECTRIC CONTROLLER PANEL IN ESP
NO.
ACTIVITY
REMARKS
31.
Push the H.T. ON/OFF switch to make the main contactor ‘ON’.
32.
Check whether T/O switch LED glows for some time.
33.
Slowly turn the CURRENT LIMIT Pot meter towards clockwise direction.
34.
Check the voltmeter whether it indicates full voltage as that of input voltage and is varying as per the current limit setting. If the bulbs are not becoming ON, switch OFF the panel, interchange the AC power supply lines to the BAPCON. If the bulbs are flickering* and the output voltage is low, switch OFF the panel and check for the loose connections. After correcting the problem, repeat the procedure.
35.
Turn the Is LIMIT Pot. Meter fully towards counter clockwise direction.
36.
Push the HT ON/OFF switch to the make the main contactor off & check the LED inset extinguishes.
37.
Resume the value of the UV limit to 10%
38.
Switch OFF the main SFU of the control panel.
39.
Remove the incandescent lamps & volt meter.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 6 OF 6
PLANT AREA: ELECTRIC CONTROLLER PANEL IN ESP
NO.
40.
ACTIVITY
REMARKS
Re-connect the output cables heading to T/R set. * This problem happens because of the single thyristor firing, which may destroy the TR set during operation because of core saturation. Care should be taken by checking the proper functioning of thyristory during precommissioning.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 3
PLANT AREA: ESP – H.V. TRANSFORMER RECTIFIES
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________
NO.
ACTIVITY
REMARKS
1.
Check Transformer rollers are arrested from movement.
2.
Check any damage / oil leaks in bushing of Transformer and insulation.
3.
Ensure the Break down value of oil used in transformed shall comply with standard and free with moisture.
4.
Check that pressure reliet diagram infact. Check that functioning of mercury switches of Buchholz relay for Alarm & Trip by injection air through test pet-cock, when full of oil.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 3
PLANT AREA: ESP – H.V. TRANSFORMER RECTIFIES
NO.
ACTIVITY
REMARKS
5.
Ensure that HVR oil is at correct level in the conservator (up to 50% level **)
6.
Check that the silicagel should be blue in colour.
7.
Ensure that earthing of tank and HV positive terminal is completed.
8.
Check that wiring of various alarm & Trip contacts.
9.
Conduct drying out tests and check that a) b)
Oil samples characters from tank is comply with standard. IR valve of Transformer winding Typical valve (meg. Ohm) is H.E.=200 mr. L-E = 200 mr
H-L= 200 mr
10.
Check that continuity of Transformer winding
11.
Check that alarm & Trip contact of temperature indicator switch function.
12.
Check that wiring from various accessories to thermometer box in the HV transformer rectified.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 3 OF 3
PLANT AREA: ESP – H.V. TRANSFORMER RECTIFIES
NO.
ACTIVITY
are
REMARKS
13.
Check that all oil valves closed/opened as regd.
in
correct
position
14.
Check that thermometer & Thermometer pocket provided on the tank.
15.
Check that transformer negative Busting is earthed. Measure voltage drop across AS1 – AS2 at rated current.
16.
Measure Voltage drop across AS-2 AR (U KVDC)
17.
Remove external As2 cartn connection prior IO IR measurements.
18.
Set the alarm & Trip Switches of temperature indicates as per respective manual.
19.
Check the termination of power cable & control cable from E.C. to Transformer
20.
Measure the IR valve for the power cable & control cable from EC to transformer.
21.
Check that all feed back signal cable (Screened) termination and continuity.
22.
Check that sector switch (SC/occ mode & local & remote) function in the EC panel.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 1
PLANT AREA: ESP DISCONNECTING SWITEHES
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________ NO.
ACTIVITY
REMARKS
1.
Ensure that insulators are healthy, clean and rigid.
2.
Ensure that HV bus terminals and earth connections inside are tight.
3.
Ensure that operation of moving blade with HV and earth contacts is smooth and proper
4.
Ensure that Copper cable between moving arm insulator head is properly connected. Each disconnecting switch is provided with a danger plate and two external earth connections to earth mat.
5.
Ensure that door are closed tightly
6.
Ensure that interlocks provided at doors and handles are working properly.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 1 OF 2
PLANT AREA: INSULATOR HOUSING
UNIT NO. ______________________________ PANEL. NO. __________________ BOARD TITLE _________________________ CIRCUIT TITLE __________________ MODULE TYPE ______________________ SERIAL NO. ______________________ MANUFACTURER ______________________ SUPPLIER ______________________ CONTRACTOR / MANUFACTURER _______________________________________ TYPE __________________________________ RATING _____________________ CONTROL CIRCUIT VOLTAGE : _________________________________________
NO.
ACTIVITY
REMARKS
1.
Ensure that insulators are clean, healthy and rigid.
2.
Ensure that copper tubes are straight and not loose.
3.
Ensure that heating elements are properly fixed.
4.
Ensure that earthing is proper.
5.
Ensure that screw legs and nuts for placement of alignment jigs are welded.
6.
Ensure that doors are closed tightly.
7.
Ensure that interlocks are working properly.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
ELECTRICAL STATION
STANDARD CHECK LIST
SHEET 2 OF 2
PLANT AREA: INSULATOR HOUSING
NO.
ACTIVITY
REMARKS
8.
Ensure that each insulator housing is provided with a danger plate and two external earth connection to earth grid.
9.
Ensure that flanged joints are provided with gaskets and earthing cables.
10.
Ensure that copper tubes are straight and tightly connected. HEATINGELEMENTS
1.
Ensure that IR value is above 2 M Ohm
2.
Ensure that continuity is ascertained.
3.
Ensure that cables are terminated properly with crimped lugs and glands and terminal box cover is water tight.
4.
Ensure that cable armour and earth points are connected to the earth. THERMO STATS
1.
Ensure that cables are terminated properly.
2.
Ensure that cover is water tight
3.
Ensure Recommended setting for thermostat is 120 0C and 1400C for hopper and support insulator heaters respectively.
4.
Ensure that contact continuity is verified.
Defective & Omission Continuation Overleaf REMARKS N.T.P.C. SIGNATURE
BHEL SIGNATURE
DATE
