Scheme Communication; Overview; Current Reversal And Weak-End Infeed Logic For Residual Overcurrent Protection Ecrwpsch; Scheme Communication Logic For Residual Overcurrent Protection Ecpsch - ABB RET670 Operator's Manual

Section 9
Read and change settings
9.3.8
9.3.8.1
9.3.8.2
9.3.8.3
9.3.9
9.3.9.1
9.3.9.2
66

Scheme communication

Overview

Under Scheme communication there are settings for Zone scheme communication,
Zone current reversal, Local acceleration logic, EF Scheme communication and EF
Current reversal weak end infeed. In each category the function can be switched
On or Off and time delays, ratings and parameters can be set.
Current reversal and weak-end infeed logic for residual overcurrent
protection ECRWPSCH
Main menu/Settings/Setting Group N/Scheme communication/
EFCurrentReversalWEI(PSCH,85)/ECRWPSCH:x
Displays available settable parameters including operation, rated values, time data
and other related settings.
Scheme communication logic for residual overcurrent protection
ECPSCH
Main menu/Settings/Setting Group N/Scheme communication/
EFSchemeCommunication(PSCH,85)/ECPSCH:x
Displays setting parameters for operation, scheme type and coordination time.

Secondary system supervision

Overview
Under Secondary circuit supervision there are settings for Current circuit
supervision and Fuse failure. There are five instances of Current circuit supervision
with parameters for minimum operation current, rated current and operation. There
are six instances of Fuse failure supervision parameters for setting rated current,
voltage, operation mode and several other parameters.

Current circuit supervision CCSRDIF

Main menu/Settings/Setting group N/Secondary system supervision/
CurrentCircuitSupervision(RDIF,87)/CCSRDIF:x
Displays available instances of CCSRDIF with some settings per instance. There
are settings for operation, base current setting, blocking of function, and minimum
threshold for current differential.
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Operator's manual