7SA511 Line Protection RelayAcceptance Tests

Prerequisite Settings:

 

 

Addr.

LCD Text

Description

Setting

7810

AUTO RECL.

Indicate whether or not the automatic

EXIST

 

 

reclose function exists

 

3401

AR FUNCT

Turn the auto-reclose function on or off

ON

The settings listed below are required to properly check control of the overreach zone

2101

PUTT MODE

Turn the permissive underreach transfer

OFF

 

 

trip mode on or off

 

2201

POTT MODE

Turn the permissive overreach transfer

OFF

 

 

trip mode on or off

 

7904

AR w/o TELE

Indicate whether or the auto-reclose function works with or without the pilot protection schemes (POTT and PUTT)

YES

The logical function >CB ready (FNo 074) must be assigned to a binary input with a simulated input signal applied at the appropriate time in the test cycle.

Depending on which AR program is selected at address 3412 (three-pole, single-pole, or single/three-pole), a single-phase and/or two-phase short circuit should be simulated once within zone Z1, and once beyond Z1 but within Z1B. In each case, both successful and unsuccessful AR cycles should be tested. Check the proper reaction of the relay according to the set AR program. For multi-shot AR, zone Z1L is decisive from the second shot (DAR) on.

Note that each new test can begin only after the reclaim time for the previous test has expired; otherwise an automatic reclose cannot result. LED 6 with AR not ready (FNo 806) assigned (a factory preset) must illuminate.

If the circuit breaker is not ready, a reclose attempt must not result; clearance of short circuits beyond Z1 is delayed by time element T2 or in a later element. However, a normal AR cycle must occur when the circuit-breaker-ready signal first disappears after the inception of the fault.

3.17 End of Acceptance Testing

Once these tests are completed and you are satisfied with the relay’s performance and the test results, check any settings that were changed for test purposes and return all settings to your settings. Refer to the various instructions in this chapter or to Chapter 5 for detailed information on relay presettings and programming procedures.

July 27, 1995

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Siemens 7SA511 manual Prerequisite Settings Addr LCD Text Description, End of Acceptance Testing