STUB

1MRK 580 022-BEN

Stub protection

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Issued: January 2001

Status: NewData subject to change without notice

Features • Phase segregated current measurement • Activation from line disconnector position

Application The stub protection operates for faults in the parts of 1 1/2 and ring bus station configura-tions, which cannot be protected by the dis-tance protection function if the line isolators

are opened. The use of the function can be extended to various other purposes, when a three phase overcurrent protection can oper-ate only under special external conditions.

Design The function operates as a three phase instan-taneous overcurrent protection. The function is released when the line disconnector is open; a normally closed auxiliary contact of

the line disconnector has to be connected to the STUB-RELEASE functional input by configuration.

The operating level of the overcurrent protec-tion is settable over a wide range.

Function block

Input and output signals

Table 1: Input signals for the STUB (STUB-) function block

Table 2: Output signals for the STUB (STUB-) function block

Technical data Table 3: STUB - Stub protection

xx00000199.vsd

STUB-STUB

BLOCKRELEASE

TRIP

Signal Description

BLOCK Block of stub protection

RELEASE Release of stub protection

Signal Description

TRIP Trip by stub protection

Function Setting range Accuracy

Operate current I> (20-300) % of Ir +/- 2.5 % of Ir at I ≤Ir +/- 2.5 % of I at I > Ir

Stub protection STUB1MRK 580 022-BEN

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ManufacturerABB Automation Products AB

Substation Automation Division

SE-721 59 Västerås

Sweden

Tel: +46 (0) 21 34 20 00

Fax: +46 (0) 21 14 69 18