ABB RELION REX640 Technical Manual page 1224

Protection and control

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Table of Contents

Protection related functions

Table 1166: Special conditions

U3P connected to real meas-

Improper analog channel configuration causes a validation error if the analog

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

For troubleshooting, 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 CVPSOF can be described by using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 697: Functional module diagram

This module is used for detecting a possible fault immediately after circuit breaker

closing. The use of external protection function, typically the start signal from a

The function can work with any two phase voltage channels

connected but it is recommended to connect all three volt-

age channels.

1MRS759142 F

Operation setting. The

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