7SA511 Line Protection Relay

Chapter 7

Note: As a safety precaution, delete the assignment of FNo 880 to the output relay controlling the circuit breaker before returning the relay to service.

7.3.5 Automatic Reclose Test (4300) (Optional)

This test procedure utilizes the optional internal automatic reclose function. The relay can be ordered either with 3-pole auto-reclose (single- and multi-shot, model 7SA511*-**A5*- **B/F*) or for all modes of auto-reclose (single-pole, 3-pole, single- and 3-pole, single- and multi-shot, model 7SA511*-**A5*-**C/G*).

If the model contains only 3-pole auto-reclose, then only those test options are available which relate to the 3-pole auto-reclose program. Single-pole tests will only be carried out by the relay when single-pole auto-reclose is also permitted. Check the setting at address 3412 to determine which test options should be available when testing your relay:

Addr.

3412

LCD Text & Description

RAR PROG.—Indicates the auto-reclose program for the first reclose cycle (RAR)

Setting Options & Descriptions

THREE-POLE -- 3-pole auto-reclose occurs for each type of fault.

SINGLE-POLE—Single-pole auto-reclose occurs for single-

￿phase faults; auto-reclose is blocked for multi-phase faults. SINGLE/THREE-POL—Single-pole auto-reclose occurs for single-phase faults; 3-pole auto-reclose occurs for multi-phase faults.

As described in section 7.3.4 above, the programming of the CB auxiliary contact control at address 1113 must be correct before the relay will allow the test. Additional prerequisites to starting the internal automatic reclose test are:

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.

The auto-reclose function is not blocked (i.e., the circuit breaker is ready)

Prerequisite Settings:

Addr.

LCD Text

7810

INTERNAL AR

 

 

3401

AUTO-RECL.

 

FUNCTIONS

Description

Indicates whether or not the relay has the internal auto-reclose function

Turns the auto-reclose function on or off

Setting

EXIST

ON

July 27, 1995

7-15

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Image 169
Siemens 7SA511 Automatic Reclose Test 4300 Optional, LCD Text & Description, Setting Options & Descriptions, Auto-Recl