Operation Principle - ABB RELION REX640 Technical Manual

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Protection functions

Analog signals

See the preprocessing function blocks in this document for the

possible signal sources.

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 Operation setting. The

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

The operation of JAMPTOC can be described with a module diagram. All the modules

in the diagram are explained in the next sections.

GUID-D3FC1D45-197B-4002-8FFB-C9F0194AEC8F V1 EN

Functional module diagram

Level detector

The measured phase currents are compared to the set Start value. The TRMS values

of the phase currents are considered for the level detection. The timer module is

enabled if at least two of the measured phase currents exceed the set Start value.

Once activated, the internal START signal is activated. The value is available only

through the Monitored data view. The time characteristic is according to DT. When

the operation timer has reached the Operate delay time value, the OPERATE output is

When the timer has elapsed but the motor stall condition still exists, the OPERATE

output remains active until the phase currents values drop below the Start value, that

is, until the stall condition persists. If the drop-off situation occurs while the operating

Three-phase currents

1MRS759142 C

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