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Schedule Shutdown’s

Schedule Shutdown’s . MS1, MS2, MS3, NS0, NS1, NS2, MS4. Typical Problems Found: Bad HV Switch Operators Bad Heaters Some HV Cable Corona Bad 500 Amp Molded Case Breaker Rusted Out Cubical 480 Volt Main Breakers Failing to reclose – trip rod device hangs up.

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Schedule Shutdown’s

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  1. Schedule Shutdown’s MS1, MS2, MS3, NS0, NS1, NS2, MS4

  2. Typical Problems Found: • Bad HV Switch Operators • Bad Heaters • Some HV Cable Corona • Bad 500 Amp Molded Case Breaker • Rusted Out Cubical • 480 Volt Main Breakers Failing to reclose – trip rod device hangs up

  3. At Y-ML5, termination mismatch – shield is above the stress cone of the back cable – corona found. Corrective – re-tape and increase spacing between cables

  4. At Y-ML6, Y-ML5, and Y-ML10 – rusted interiors on the side that is next to the roadway

  5. At Y-ML6, Y-ML5, and Y-ML10 – Some of the correctives used on the rusted Interiors.

  6. Typical Allis-Chalmers 1500KVA Substation Low Voltage 480 Volt Section High Voltage Section

  7. On Y-ML10, Bad High Voltage Switch Operator (Was replaces with operator from NS4 NL6A )

  8. Stock Photo of HV switch operator

  9. On Y-ML10, “A” Phase fiberglass operator broke after several switch operation during the replacement of the failed high voltage switch operator. Failure point

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