ABB RELION REX640 Technical Manual page 585

Protection and control

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1MRS759142 F

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

mismatch is corrected.

Operation principle

the function is enabled and respectively "off" means function is disabled.

The operation of

described by using a module diagram (see figure below). All the modules in the

diagram are explained in the next sections.

Figure 335: Functional module diagram

General fault criterion

The General fault criterion (GFC) module monitors the presence of earth fault in the

network. It is based on the value of the fundamental frequency residual voltage

Technical Manual

Operation setting is used to enable or disable the function. When selected "on"

Touch voltage-based earth-fault current protection IFPTOC can be

Protection functions

Intermittent