Simple Disconnector Switch (DS) Testing for Switchyard Equipment
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The commissioning test report summarizes testing of a disconnector and earth switch at a substation for a customer. It lists the contractor and customer witnesses who were present for the testing. Measurement results are provided for resistance and insulation resistance tests between phases and of open contacts using a 5kV insulation tester. Operation checks showed the disconnector's electrical and manual operations and the earth switch 1's electrical and manual operations were okay, while earth switch 2 tests were not applicable.
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CIRCUIT BREAKER USED IN THERMAL POWER PLANTS
Circuit breakers are devices capable of making and breaking electric circuits under normal and abnormal conditions such as short circuits. They interrupt the arc produced during contact separation using a suitable medium and arc extinction techniques.
Circuit breakers can be classified by several characteristics including whether they are indoor or outdoor, fixed or drawout, the arc quenching medium used, the operating mechanism, voltage level, and configuration. Common arc quenching media include air, oil, sulfur hexafluoride, and vacuum. Circuit breakers are also rated based on their breaking capacity, making capacity, and other timing parameters.
Vacuum circuit breakers use vacuum interrupters which provide benefits like being compact, pollution-free, and having
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- 1. Tested by (Contractor): Tests witnessed by (Customer): Name: Name: Name: Name: Signature: Date Signature: Date Signature: Date Signature: Date Page 1of 1 Commissioning Test Report of Disconnector and Earth Switch Customer: PGCB Contract: Siemens Ltd. Substation: Type: Bay No. Serial No.: Rated voltage: 132 kV Rated current: A Rated control voltage: 415 3Ph V (AC) Motor current A (AC) Tests R - Phase Y-Phase B-Phase Remarks Resistance & Insulation Resistance Contact Resistance for main pole Ω Ω Ω @ Current 100A Insulation Resistance between Phases MΩ MΩ MΩ 5kV insulation tester Insulation resistance of Open contact MΩ MΩ MΩ 5kV insulation tester Operation Check Disconnector Electrical Operation OK OK OK Disconnector Manual Operation OK OK OK Earth Switch 1 Electrical Operation Earth Switch 1 Manual Operation Earth Switch 2 Electrical Operation Not Applicable Earth Switch 2 Manual Operation Not Applicable Remarks: