ABB RELION REX640 Technical Manual page 327

Protection and control

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Table of Contents

1MRS759142 F

The function contains a blocking functionality. It is possible to block function

outputs, timers or the function itself.

Analog input configuration

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

Table 362: Analog inputs

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 PHxPTOC can be described by using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 198: Functional module diagram

Level detector

The measured phase currents are compared phasewise to the set

measured value exceeds the set

of the value to the phase selection logic. If the ENA_MULT input is active, the

value setting is multiplied by the Start value Mult setting.

Technical Manual

See the preprocessing function blocks in this document for the possible

signal sources.

The protection relay does not accept the

setting if the product of these settings exceeds the

Three-phase currents

Start value , the level detector reports the exceeding

Protection functions

Operation setting. The

Start value . If the

Start value or Start value Mult

Start value setting