Operation Principle - ABB RELION REX640 Technical Manual

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1MRS759142 C

Technical Manual

Operation principle

The function can be enabled and disabled with the Operation setting. The

corresponding parameter values are "On" and "Off".

The operation of HAEFPTOC can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

GUID-792AC03A-0E40-4406-B217-99AE844B0340 V1 EN

Functional module diagram

Harmonics calculation

This module feeds the measured residual current to the high-pass filter, where the

frequency range is limited to start from two times the fundamental frequency of the

network (for example, in a 50 Hz network the cutoff frequency is 100 Hz), that is,

summing the harmonic components of the network from the second harmonic. The

output of the filter, later referred to as the harmonics current, is fed to the Level

detector and Current comparison modules.

The harmonics current I_HARM_RES is available in the monitored data view. The

value is also sent over horizontal communication to the other protection relays on the

parallel feeders configured in the protection scheme.

Protection functions

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