Testing and Calibration of Circuit Breakers, Power Transformers, Protection Relays, Measuring Instruments, Earth Pits, Transformer Oils etc. installed in Gidi C Colliery under Argada Area.

Testing of 3 MVA, 11KV/3.3KV main power transformer- i) Insulation Resistance Test-HT to LT, HT to Earth & LT to Earth. ii)Vector Group Test iii)Polarity Test. iv)Magnetic Balance Test. v)Turn Ratio Test vi)Magnetizing Current Measurement and vii)Winding Resistance Measurement.

Testing of Neutral Grounding Resistance - i) Insulation Resistance Value and ii) Neutral Resistance Value

Testing of Circuit breaker which includes IR values ( open and closed conditions), Contact resistance incl. dynamic contact resistance measurement, CB timing test, Coil resistance test and Hi-Pot test.

Testing & calibration of following Protection relays by secondary injection method installed in 11KV/3.3KV VCBs: 3O/C+1E/F Relay, Earth leakage relay with CBCT.

Testing of HT DOL Starter i) Insulation Resistance Values Open condition and closed Condition, and ii) Contact resistance incl. Dynamic Contact Resistance Measurement

Testing of Overhead lines and DP Structure which includes Size of poles of DP Structure, Clearance between phase to phase and phase to earth, Ground clearance of the conductors, check of electrical clearance along the route of overhead line, Check of Ground clearance, check the footings of the poles, Earthing arrangements.

Testing of earth resistance of Earth pits by 3 electrode ( Fall of potential) Method.

Testing of Transformer oil properties as per IS 1866: i) Dielectric Strength (Break down Voltage) ii)Moisture (water content) iii)Dielectric Dissipation Factor (Tan delta) @ 90deg celcius. iv)Sediment & sludge content v)Dissolved Gas analysis

Calibration of Insulation Tester 5KV.

Calibration of Clamp meter.