Siemens 7SA511 manual Circuit Breaker Trip Test, CB Auxiliary Contact Control

7SA511 Line Protection Relay Chapter 7

the echo delay time of the relay at the opposite line end (0.2 seconds as delivered, see address 3211).

c)Open the circuit breaker. Repeat these tests for the other line end.

3.Turn the distance protection function on at address 1201 (DIST.PROT. ON).

7.3.4 Circuit Breaker Trip Test (4400)

A test to verify the operation of the circuit breaker tripping function and the operation of the circuit breaker is available through the operator panel at address 4400. The relay must be in programming mode to run this test. Prerequisites to starting the test are described below.

No protection function is picked up. The circuit breaker is closed.

CB Test Trip (FNo 880), is assigned to the output relay that trips the circuit breaker under test.

To trip the circuit breaker single-pole with an external single-pole auto-reclose relay,

￿the logical function >1pole Trip (FNo 066) must be assigned to a binary input. To trip all three poles of the circuit breaker, the logical function >1pole only (FNo 067) must not be activated by an external signal.

In the 7SA511 relay, confirmation of a closed circuit breaker is always required from the operator panel. It will also be required from a binary input if CB AUX.CNT at address 1113 is set to

CONNECTED.

CB Auxiliary Contact Control

When address 1113 is set to CONNECTED, one of the binary inputs must be assigned logical function >CB Aux Cont (FNo 012). When the request for the trip test is made, the relay will not proceed with the test unless the binary input that has been assigned FNo 012 indicates that the CB is closed regardless of any confirmation to this effect from the operator panel. The relay will accept the operator panel confirmation and allow the test if address 1113 is set to NOT CONNECTED or the binary input verifies that the CB is closed.

Test Procedure

Note: Press the key at any time to abort a test procedure.

1. Place the relayLIVETRIP440in0CBTESTprogramming mode by entering the password, then access address 4404.

July 27, 1995 7-13