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Reduction in Downtime via Interlocking

Reduction in Downtime via Interlocking. Date: 3 rd March 2012 . A tripping occurred since the Areva panels had a tripping command system if the DC supply failed. This was removed by removing that function from the panel and a alarm using a contractor with a reset operation was made

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Reduction in Downtime via Interlocking

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  1. Reduction in Downtime via Interlocking Date: 3rd March 2012 • A tripping occurred since the Areva panels had a tripping command system if the DC supply failed. • This was removed by removing that function from the panel and a alarm using a contractor with a reset operation was made • For future purposes a downtime of 60 minutes was avoided.

  2. How did the failure happen?

  3. SLD of the Hooter Circuit K1 MCB Output K1 (N.C.) K2 (N.C.) e f e1 f1 Fed by UPS Power Hooter K2 (N.O.) K1 (N.C.) a1 b1 g h Push Button (N.O) Fed by UPS Power K2

  4. Savings Calculations • Now if the DC fails the Hooter will show the fault. • There is also a ‘Reset Button’ to accept the fault and bring it back to normal condition. • This is not a one time saving it is applicable for the future also. • Now Downtime of Unit 1, 2, 5 and Gyaanpeeth from DC failure can be avoided. • Hooter would run and action can be taken in time. *This is not a one time saving. For future there will be no downtime due to this reason.

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