Siemens SIPROTEC 7SJ62 Manual page 349

Multi-functional protective relay with local control

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Table of Contents

2P-Procedure

Parameter 172 52 B.WEAR MONIT can be set to activate the 2P procedure. An operating cycles diagram (see

sample diagram in the functional description of the 2P procedure), provided by the manufacturer, shows the

relationship of make-break operations and tripping current. The two vertices of this characteristic in a double

logarithmic scale are decisive for the setting of addresses260 to 263:

Point P1 is determined by the number of permitted make-break operations (parameter 261 OP.CYCLES AT

Ir) for rated operational current Ir (parameter 260 Ir-52)

Point P2 is determined by the maximum number of make-break operations (parameter 263 OP.CYCLES Isc)

for rated fault tripping current Isc (parameter 262 Isc-52).

For the procedure to operate correctly, the time response of the circuit breaker must be specified in parameters

266T 52 BREAKTIME and 267T 52 OPENING.

t-procedure is activated via configuration parameter 172 52 B.WEAR MONIT. The square fault current

integrals are referred to the squared device nominal current. For purposes of determining the arc time, the

device must be informed of the CB tripping time T 52 BREAKTIME as well as the CB opening time T 52

OPENING of the circuit breaker. For recognition of the last zero crossing (arc deletion) of the currents after trip-

ping, the „Current-zero" Criterion is required.

SIPROTEC, 7SJ62/64, Manual

C53000-G1140-C207-2, Release date 01.2008

2.23 Auxiliary Functions