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Pre-Commissioning Tests for AC Side of Solar Power Plant

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The document is a checklist to commission various AC Side equipment - Transformers (Power, Auxillary & Inverter) , HT Panels, Relays, Circuit Breakers, LA, CT, PT, C&R Panel.

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Pre-Commissioning Tests for AC Side of Solar Power Plant

  1. 1. S.NO. EQUIPMENT DETAILS TEST DETAILS INSULATION RESISTANCE TEST PI TEST VOLTAGE RATIO & TAP CONTINUITY TEST MAGNETIC BALANCE TEST VECTOR GROUP TEST WINDING RESISTANCE (HV SIDE) AT ALL TAPS WINDING RESISTANCE (LV SIDE) AT ALL TAPS MAGNETIZATION CURRENT TEST BDV OF TRANSFORMER OIL (And Oil Filterization) TAN ᵹ & CAPACITANCE CHECKS OLTC operational test Checking of: 1)Valves position (on / off), 2)Gasket joints to avoid oil leakage, 3)Earthing CONFIRMITY TEST (1) Visual external damage to any part of the transformer (2) Buchholz alaram + trip contacts (3) WTI & OTI alaram + trip contacts (4) MOG contacts (5) Phase Sequence Check (6) colour of silica gel/Oil level/leakage, if any (7) Abnormality, if any. INSULATION RESISTANCE TEST PI TEST VOLTAGE RATIO & TAP CONTINUITY TEST MAGNETIC BALANCE TEST VECTOR GROUP TEST WINDING RESISTANCE (HV SIDE) AT ALL TAPS WINDING RESISTANCE (LV SIDE) AT ALL TAPS MAGNETIZATION CURRENT TEST BDV TEST OF TRANSFORMER OIL (And Oil Filerataion) Checking of: 1)Valves position (on / off), 2)Gasket joints to avoid oil leakage, 3)Earthing CONFIRMITY TEST (1) Visual external damage to any part of the transformer (2) Bucholz alaram + trip contacts (3) WTI & OTI alaram + trip contacts (4) MOG contacts (5) Phase Sequence Check (6) colour of silica gel/Oil level/leakage, if any (7) Abnormality, if any. INSULATION RESISTANCE TEST PI TEST VOLTAGE RATIO & TAP CONTINUITY TEST MAGNETIC BALANCE TEST VECTOR GROUP TEST WINDING RESISTANCE (HV SIDE) AT ALL TAPS WINDING RESISTANCE (LV SIDE) AT ALL TAPS MAGNETIZATION CURRENT TEST BDV TEST OF TRANSFORMER OIL LIST OF PRE-COMMISSIONING TESTS OF AC EQUIPMENTS POWER TRANSFORMER1 INVERTER TRANSFORMER2 3 Auxiliary transformer
  2. 2. CONFIRMITY TEST (1) Visual external damage to any part of the transformer (2) Phase Sequence Check (3) colour of silica gel/Oil level/leakage, if any (4) Abnormality, if any. PHYSICAL CHECKING OF VARIOUS ELECTRICAL & MECHANICAL PARTS CONTINUITY & CONTROL CIRCUIT CHECK 11kV VCB IR Test (1) Close Condition (RY, YB,BR, RE, YE, BE) (2) Open Condition (RR', YY', BB') Contact Resistance Test Timing Test (1) Open time (2) Close time Coil resistance test (1) Closing coil (2) Tripping coil-1 (3) Tripping coil-2 (4) Motor winding Control Circuit & Operational checks (1) Manual charging of spring (2) Mechanical closing & tripping (3) Charging of spring through motor (4) Tripping through relays/releases (5) Breaker close command blocking when relay / releases is in operated condition (6) Abnormality, if any Maintenance & general check-ups (1) Inspection for physical damage (2) cleaning & tightness of breaker bolts (3) Alignment of breaker (4) Earthing connection (5) Gas pressure low operation (6) Abnormality, if any CT IR TEST (P - E, S- E, P - S, S -S) Winding Resistance Test Magnetization characteristic check Ratio, Polarity & Circuit check General checks 1) Inspection for physical damage 2) Continuity check for ammeter and/or relay circuits PT IR TEST (P - E, S- E, P - S, S -S) Winding Resistance Test Ratio, Polarity & Circuit check General checks 1) Inspection for physical damage 2) Continuity check for Voltmeter and/or relay circuits LBS IR TEST on each pole Measurement of contact resistance for all three phases Manual checking of operation (close or open) by Handle Checking of Interlocks (mechanical and electrical) HVDC Test Bus Bars:- 1) IR TEST 2) Contact Resistance Test CHECK UP OF ALL ALARAMS AND ANNUNCIATION SPACE HEATER OPERATION CHECK INTERFACE CHECK BETWEEN PANELS TESTS OF PROTECTIVE RELAYS ON SETTINGS CONFIGURED 11 KV HT PANELS, RMU PANELS, C&R PANEL, RTCC PANEL 4
  3. 3. NUMERICAL Relay 1) Seconday Injection Test (according to service setting of relay) a) Time Current characteristics tests for O/C unit b) Instantaneous O/C unit protection c) Time Current characteristics tests for E/F unit d) Instantaneous E/F unit protection 2) General Checks:- Inspection for physical damage, wiring check, Resetting of LEDs with cover TRIPPING Relay (86, Numerical Relay) 1) Insulation resistance test (between all terminals and body, between various ciruits) 2) Coil Resistance Test 3) Coil Pick up & drop off test 4) General Check:- Inspection for physical damage, wiring check of relay, cleaning & pressure of relay contacts, Flag operation and resetting of flags with cover DIFFERENTIAL (Numerical) Relay (87 T) 1) Differential Pick-up check 2) Stability Check 3) Secondary Injection Test a) Time Current characteristics tests for O/C unit b) Instantaneous O/C unit protection c) Time Current characteristics tests for E/F unit d) Instantaneous E/F unit protection 4) Over Fluxing 5) Under Voltage unit test 6) Over Voltage unit test 7) Restricted E/F Protection (HT Side) 8) Restricted E/F Protection (LV Side) 9) General Check up:- Inspection for physical damage, wiring check of relay, LED indication & Push button operation, Service setting re-stored Auxiliary Relay (Electromechanical Relay) 1) Insulation resistance test (between all terminals and body, between various ciruits) 2) Coil Resistance Test 3) Coil Pick up & drop off test 4) General Check:- Inspection for physical damage, wiring check of relay, cleaning & pressure of relay contacts, Flag operation and resetting of flags with cover MULTIFUNCTION RELAYS 4
  4. 4. IR Test (1) Close Condition (RY, YB,BR, RE, YE, BE) (2) Open Condition (RR', YY'. BB') Contact Resistance Test Timing Test (1) Open time (2) Close time Coil resistance test (1) Closing coil (2) Tripping coil-1 (3) Tripping coil-2 (4) Motor winding Control Circuit & Operational checks (1) Manual charging of spring (2) Mechanical closing & tripping (3) Charging of spring through motor (4) Tripping through relays/releases (5) Breaker close command blocking when relay / releases is in operated condition (6) Abnormality, if any Maintenance & general check-ups (1) Inspection for physical damage (2) cleaning & tightness of breaker bolts (3) Alignment of breaker (4) Earthing connection (5) Gas pressure low operation (6) Abnormality, if any 7) test for leakage of air / gas Insulation Resistance (R-E, Y-E, B-E) Contact Resistance Test Checking of mechanical interlok between Isolator & Earth switch (if the model is Isolator with Earth switch) Opretional Checks (1) Mechanical Check (2) Electrical Check (the operating mechanism of the 3 poles shall be well synchronized) Insulation Resistance (P-E) Counter Test Maintenance & General check-ups (1) Inspection for physical damage (2) Cleaning & tightness of bolts (3) Earthing connection (4) Abnormality, if any IR TEST (P - E, S- E, P - S, S -S) Winding Resistance Test Magnetization characteristic check Ratio, Polarity & Circuit check General checks 1) Inspection for physical damage 2) Continuity check for ammeter and/or relay circuits IR TEST (P - E, S- E, P - S, S -S) Winding Resistance Test Ratio, Polarity & Circuit check General checks 1) Inspection for physical damage 2) Continuity check for Voltmeter and/or relay circuits IR TEST (P - E, S- E, P - S, S -S) Winding Resistance Test Ratio, Polarity & Circuit check 7 LA Horizontal Mounted Double Break Isolator & Earth switch 6 CT8 PT9 5 SF6 CIRCUIT BREAKER CVT10
  5. 5. Capacitance measure of capacitor section General checks 1) Inspection for physical damage 2) Continuity check for Voltmeter and/or relay 11 INSULATORS HIGH VOLTAGE TEST PHYSICAL CHECKING OF LAYING & TERMINATION CONTINUITY TEST INSULATION RESISTANCE TEST PI VALUE HIGH VOLTAGE TEST (DC/AC) PHYSICAL CHECKING OF LAYING & TERMINATION CONTINUITY TEST INSULATION RESISTANCE TEST EARTH RESISTANCE TEST PHYSICAL CHECKING OF CONNECTIONS CONTINUITY OF GROUNDING CONNECTIONS & JOINTS CHECKING OF COMPLETE EARTHING NETWORK Checking of interpanel wiring, protection relays, terminal block contacts, earthing Ensuring the interlock between Isolators & SF6 circuit breaker IR test between Control, CT, PT circuits & earth 16 Battery, Battery charger & DCDB Checking of connections, physical damage, voltage at output terminals 17 UPS & Battery Checking of connections, physical damage, voltage at output terminals 18 PLCC,Wavetrap Checking of connections, earthing C&R Panel15 14 EARTHING LT CABLES13 12 HT CABLES CVT10

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