Siemens 7SA511 manual Testing the Automatic Reclose AR Function Optional, Inverse Time

7SA511 Line Protection Relay Acceptance Tests

Note: The current and voltage applied in the same phase must be in phase opposition so that the relay trips in the “forwards” direction (function E/F T-> expir, FNo 772).

6.If directional comparison is turned on, the transmission circuit can be checked. Verify that the function E/F Send (FNo 791) message appears in the target log.

7.To check the receiver circuit, a single-phase fault in the forwards direction is simulated, simultaneously when the external input of binary input signal >E/F Recept (FNo 090) is applied. When directional comparison is active, the relay will not trip if the comparison signal is not received.

3.15.2 Testing the Nondirectional Inverse Time Ground Fault Protection

For nondirectional ground fault protection, one working point on the inverse time characteristic (see Figure D-1 in “Specifications”) is checked, normally at 2 times the set pickup value I E> (address 3303).

Prerequisite Settings:

Addr.	LCD Text
7808	EARTH FAULT
3301	E/F I.T.

Description

Type of high-resistance ground fault detection

Turn the nondirectional, inverse time ground fault protection on or off

Setting

INVERSE TIME

ON

To perform this test, you will also need to configure, E/F Fault I>> (FNo 762), to a signal relay or LED. This function indicates that the ground fault protection element has picked up.

Test Procedure

1.Slowly increase the ground current. Pickup indication E/F Fault I>> (FNo 762) should occur at approximately 1.1 times the pickup value set at address 3303.

2.When the trip delay determined by the setting at address 3304 has expired, the message E/F Trip <->(FNo 782) should appear in the target log. This function is factory also preassigned to Trip Relays 3, 4, and 5.

3.16 Testing the Automatic Reclose (AR) Function (Optional)

This test checks the internal auto-reclose function for relay models 7SA511*-**A5*-**B/C/F/G. Depending on the relay configuration, the internal auto-reclose function can be single-pole, three- pole, or single/three-pole (address 3412).

3-32 July 27, 1995