Synchronism Check, Energizing Check, And Synchronizing Sesrsyn (25) - ABB REC670 Applications Manual

Relion 670 series, bay control

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1MRK 511 401-UUS A

Bay control REC670 2.2 ANSI

Application manual

Synchronism check, energizing check, and

synchronizing SESRSYN (25)

Identification

Function description

Synchrocheck, energizing check, and

synchronizing

Synchronizing

To allow closing of breakers between asynchronous networks, a synchronizing feature

is provided. The breaker close command is issued at the optimum time when

conditions across the breaker are satisfied in order to avoid stress on the network and

its components.

The systems are defined as asynchronous when the frequency difference between bus

and line is larger than an adjustable parameter. If the frequency difference is less than

this threshold value the system is defined to have a parallel circuit and the synchronism

check function is used.

The synchronizing function measures the difference between the V-Line and the V-

Bus. It operates and enables a closing command to the circuit breaker when the

calculated closing angle is equal to the measured phase angle and the following

conditions are simultaneously fulfilled:

identification

SYMBOL-M V1 EN-US

IP14558-1 v4

ANSI/IEEE C37.2

device number

IP15111-1 v1

SEMOD171992-5 v9

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