CODE OF PRACTICE FOR MAINTENANCE OF OIL FILLED POWER TRANSFORMERS IPSS
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CODE OF PRACTICE FOR MAINTENANCE OF OIL FILLED POWER TRANSFORMERS IPSS

FOREWORD 01 10 SCOPE Central Power Research Instit ute and National Power Grid Corporation 11 Reference Sl No INDIAN STANDARD No TITLE 117 brPage 2br 217

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CODE OF PRACTICE FOR MAINTENANCE OF OIL FILLED POWER TRANSFORMERS IPSS




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Presentation on theme: "CODE OF PRACTICE FOR MAINTENANCE OF OIL FILLED POWER TRANSFORMERS IPSS"— Presentation transcript:


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CODE OF PRACTICE FOR MAINTENANCE OF OIL FILLED POWER TRANSFORMERS IPSS:1-04-047-08 0. FOREWORD 0.1 1.0 SCOPE Central Power Research Instit ute and National Power Grid Corporation, 1.1 Reference Sl No. INDIAN STANDARD No. TITLE _______________________________________________________________________ 1/17
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2/17 _______________________________________________________________________ 2.0 GENERAL 2.1 CORE 2.2 WINDINGS 2.3 COOLING
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3/17 _______________________________________________________________________ 2.4 TANK AND COVER 2.5 CONSERVATOR 2.6

PRESSURE RELIEF DEVICE 2.7 BUCHHOLZ RELAY 2.8 SILICA GEL BREATHER 2.9 TEMPERATURE INDICATORS
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4/17 _______________________________________________________________________ 2.10 BUSHINGS 2.11 TAP CHANGER 2.12 PROTECTIONS FOR TRANSFORMER 3 MAINTENANCE
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5/17 _______________________________________________________________________ 3.1 HOURLY 3.2 DAILY 3.3 QUARTERLY CHECKING/ REPLACEMENT 3.4 HALF YEARLY (i)
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6/17 _______________________________________________________________________ 3.5 ANNUALLY 3.6 ONCE IN FIVE YEARS 3.7 ONCE IN TEN YEARS 4.0

MAINTENANCE GUIDELINES 4.1 BDV OF TRANSFORMER OIL (As per IS 6792:1992)
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7/17 _______________________________________________________________________ 4.1.1 SPECIFICATION FOR UNINHIBITED MINERAL INSULATING OIL-NEW/ UNUSED BEFORE FILLING IN TRANSFORMER/ SWITCHGEAR
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8/17 _______________________________________________________________________ 4.1.2 RECOMMENDED LIMITS OF UN USED MINERAL OIL IN NEW POWER TRANSFORMERS AS PER IS 1866:2000 5.0 MEASUREMENT OF INSULATION RESISTANCE 5.1 RECOMMENDED VALUES 5.2 MEASUREMENT OF POLARISATION INDEX
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9/17

_______________________________________________________________________ Polarisation Index Insulation Co-ordination 6.0 DRYING OUT OF TRANSFORMER Hot Oil Spraying Flushing Method:
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10/17 _______________________________________________________________________ 7.0 BUCHHOLZ RELAY FUNCTIONAL TEST 7.1 BUCHHOLZ GAS ANALYSIS
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11/17 _______________________________________________________________________
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Tube 1 Tube 2 Buchholz Relay 12/17 _______________________________________________________________________
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13/17

_______________________________________________________________________ 8.0 TAN DELTA AND CAPACI TANCE MEASUREMENT OF TRANSFORMER BUSHING 8.1 Capacitance and Tan Delta Measu rement of Winding Insulation of Transformer
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14/17 _______________________________________________________________________ 2. 3. 4. 5. 6. 7. Testing Procedure 9.0 DISSOLVED GAS ANALYSIS
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15/17 _______________________________________________________________________ 9.1 PERMISSIBLE LIMITS OF DI SSOLVED GASES IN A HEALTHY TRANSFORMER Gas Less than 4 years in service 4-10 years in service More

than 10 years in service 9.2 GAS ANALYSIS AND CORRESPONDING FAULTS Gases Possible faults Findings
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16/17 _______________________________________________________________________ 9.3 DISSOLVED GAS ANALYSIS USING GAS RATIOS
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17/17 _______________________________________________________________________ 10.0 FURAN ANALYSIS Total Furan (ppb) Conditi on of the transformer 11.0 THERMO VISION SCANNING 12.0 AUXILIARY EQUIPMENT