7EN02-0423-00

Example: injection exclusion with two incoming feeders

You can use injection exclusion to monitor two incoming feeders.

Use of circuit breakers with normally open (NO) auxiliary contacts:

Use of circuit breakers with normally closed (NC) auxiliary contacts:

If Then

  • D1 is closed and

  • D2 is open

Both devices are active:

  • Device No. 1 monitors the insulation of the system,

  • Device No. 2 only monitors the insulation of transformer 2 connection as far as D2.

  • D1 is open and

  • D2 is closed

Both devices are active:

  • Device No. 1 monitors the insulation of the transformer 1 connection as far as D1.

  • Device No. 2 monitors the insulation of the system.

  • D1 is closed and

  • D2 is closed

  • Device No. 1 monitors the insulation of the system.

  • Device No. 2 must be inhibited.

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