ABB RELION REX640 Technical Manual page 516

Protection and control

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Protection functions

50/60 Hz input source and injects a 100 V AC voltage via its coupling capacitors to

the rotor circuit towards earth.

MREFPTOC consists of independent alarm and operating stages. The operating

time characteristic is according to definite time (DT) for both stages.

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

outputs, timers or the function itself.

Analog channel configuration

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

Table 575: Analog signals

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 MREFPTOC can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 297: Functional module diagram

See the preprocessing function blocks in this document for the possible

signal sources.

Residual current (measured or calculated)

Operation setting. The

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