ABB RELION REX640 Technical Manual page 1142

Protection and control

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Table of Contents

Protection functions

Characteristic

Operate time accuracy in definite

Operate time accuracy in IDMT

Suppression of harmonics

Shunt capacitor bank switching resonance protection,

current based, SRCPTOC (ANSI 55ITHD)

Identification

Function description

Shunt capacitor bank switching res-

onance protection, current based

Function block

Figure 638: Function block symbol

Functionality

The shunt capacitor bank switching resonance protection, current based, function

SRCPTOC is used for detecting three-phase resonance caused by capacitor

switching or topology changes in the network. The operating characteristic is a

definite time (DT).

SRCPTOC contains a blocking functionality. It is possible to block function outputs,

timers or the function itself.

Analog input configuration

SRCPTOC has one analog group input which must be properly configured.

Table 1087: Analog inputs

See the preprocessing function blocks in this document for the possible

signal sources.

1 % of the theoretical value or ±20 ms

5 % of the theoretical value or ±20 ms

DFT: -50 dB at f = n × f

, where n = 2,3,4,5,..

identification

Three-phase currents

1MRS759142 F

ANSI/IEEE C37.2

device number

Technical Manual