ABB RELION REX640 Technical Manual page 1150

Protection and control

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Protection functions

Improper analog channel configuration causes a validation error if the analog

channels are not completely configured or they do not match with certain settings.

Check the contents of this chapter and also the preprocessing blocks in this

document. The configuration can be written to the protection relay once the

mismatch is corrected.

Operation principle

The function can be enabled and disabled with the

corresponding parameter values are "on" and "off".

The operation of CNUPTOV can be described with a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 642: Functional module diagram

Natural unbalance compensation

This module calculates the natural unbalance compensation. Calculation for

compensation is initiated through the command Record unbalance, available under

the menu path Control > CNUPTOV. The function equates the operating signal to

zero and calculates

For more information, see the

If the positive-sequence voltage is available at the time of memorizing the

value, the positive-sequence voltage is also memorized as

applies the revised compensation voltage to account for change in bus voltages

between the moment of memorizing the compensation voltage and the time of

applying it.

Figure 643: Equation

from the available known quantities.

. This memorized value is then used when calculating the operating quantity.

Operation setting. The

Chapter 4.12.5.6 Operating quantity

1MRS759142 F

is memorized as

section in this

. The function then

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