ABB RELION REX640 Technical Manual page 1399

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1MRS759142 C

Technical Manual

is activated as an indication of a failed closing attempt. The closing pulse is not

delivered if the closing conditions become valid after Maximum Syn time has elapsed.

The closing pulse is delivered only once for each activated external command signal,

and a new closing-command sequence cannot be started until the external command

signal is reset and reactivated. The SYNC_INPRO output is active when the closing-

command sequence is in progress and it is reset when the CL_COMMAND input is reset

or Maximum Syn time has elapsed.

SECRSYN can be set to the bypass mode by setting the parameters Synchrocheck

mode and Live dead mode to "Off" or alternatively by activating the BYPASS input.

In the bypass mode, the closing conditions are always considered to be fulfilled by

SECRSYN. Otherwise, the operation is similar to the normal mode.

Voltage angle difference adjustment

In application where the power transformer is located between the voltage

measurement and the vector group connection gives phase difference to the voltages

between the high- and low-voltage sides, the angle adjustment can be used to meet

synchronism.

GUID-9595B1ED-F40B-441F-98E2-4B6129DF4FED V1 EN

Angle difference when power transformer is in sychrocheck zone

Control functions

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