Siemens SIPROTEC 7SJ62 Manual page 318

Multi-functional protective relay with local control

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2.19 Synchronization Function

Synchronous Conditions

With parameter 6x40 SYNC PERMIS. it can be specified whether on undershooting of the threshold F

SYNCHRON (see below) only the synchronism conditions or settings are checked (YES) or whether the entire

area together with the asynchronism conditions is to be also considered (NO).

Address 6x41F SYNCHRON is an automatic threshold between synchronous and asynchronous switching. If

the frequency difference is below the specified threshold, the power systems are considered to be synchronous

and the conditions for synchronous switching apply. If it is above the threshold, the switching is asynchronous

with consideration of the time left until the voltages are in phase.

Address 6x42dV SYNC V2>V1 and 6x43dV SYNC V2<V1 can be used to set the permissible voltage differ-

ences asymmetrically.

Parameters 6x44 dα SYNC α2> α1 and 6x45 dα SYNC α2< α1 confine the operating range for synchronous

switching. These two parameters allow an asymmetrical switching range to be configured (see Figure 2-124).

Moreover, the release time delay T SYNC-DELAY (address 6x46) can be set during which all synchronous con-

ditions must at least be fulfilled for the closing command to be generated after expiration of this time.

Figure 2-124

Switching under synchronous system conditions

SIPROTEC, 7SJ62/64, Manual

C53000-G1140-C207-2, Release date 01.2008