ABB RELION REX640 Technical Manual page 1128

Protection and control

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Table of Contents

Protection functions

Steps to measure natural unbalance current

CUBPTOC Input signals

Table 1068: CUBPTOC Input signals

CUBPTOC Output signals

Table 1069: CUBPTOC Output signals

CUBPTOC Settings

Table 1070: CUBPTOC Group settings (Basic)

Values (Range)

Table continues on the next page

Connect the phase current analog input I_A and unbalance current

I_UNB to the protection relay for the CUBPTOC function to start working.

Natural Comp Enable must be set to "TRUE".

The capacitor bank must be energized.

The capacitor bank compensated unbalance current I_COM_AMPL is observed

from Monitored data.

Record unbalance must be activated by selecting the

value "Record" which stores the unbalance reference for future unbalance

calculations.

The compensated unbalance current ( I_COM_AMPL) is re-checked to be

approximately zero.

The natural unbalance recording should be made only during the steady-

state condition and when all the capacitor bank elements are assumed to

be in service.

1MRS759142 F

Analog input

Three-phase currents

Block signal for acti-

vating the blocking

Mode of operation

for Alarm stage

Technical Manual