ABB RELION REX640 Technical Manual page 1158

Protection and control

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Protection related 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.

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 INRPHAR can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 657: Functional module diagram

These modules calculate the ratio of the second harmonic (I_2H) and fundamental

frequency (I_1H) of the phase currents. The calculated value is compared to the set

Start value . If the calculated value exceeds the set Start value , the module output is

Level detector

The output of the phase-specific level detector is activated when the fundamental

frequency current I_1H exceeds the set

Once activated, Timer runs until the set

time characteristics is according to DT. When the operation timer has reached the

Operate delay time value, the Timer module output is activated. If the timer has

See the preprocessing function blocks in this document for the possible

signal sources.

Operation setting. The

Min operate current of the nominal current.

Operate delay time value is exceeded. The

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