ABB RELION REX640 Technical Manual page 1593

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1MRS759142 C

Technical Manual

functionality is enabled (Resistor control = "Automatic") and the EARTH_FAULT

output is active. The resistor control sequence after the earth-fault indication depends

on the resistor connection status during the healthy state. The healthy-state status is

selected with the Resistor healthy St setting. The available options are "On" and

"Off". The settings affecting the control sequence are explained in

Resistor healthy St

GUID-6A1A08CF-4455-4887-AF04-ACD27FDFD2B0 V1 EN

Resistor control sequence

When the earth-fault indication becomes inactive, both the single sequence and the

repeat sequences are finished and the resistor is switched back to its initial state.

The resistor control sequence contains a repeat part which can be repeated after the

whole sequence is executed once. The number of repetitions can be selected with

Resistor repeats setting. Additionally, the pause between the consecutive repeats can

be selected with Resistor pause setting. After the sequences are completed, the initial

resistor healthy state is restored within 1 s if the Resistor healthy St = "On". If the

healthy state is "Off", the resistor is already in its healthy-state position after the

sequence is completed.

It is also possible to manually trigger the resistor control sequence with

ST_RESIS_SEQ binary input.

The BLK_AUTO input blocks the automatic operation of the function. PASANCR's

automatic operation is blocked internally if the ASC is disconnected at the substation,

that is, COIL_STS signal is low. The BLK_MANUAL input blocks the manual control

of the coil. The BLK_RESISTOR input disconnects the parallel resistor and blocks its

switching on, for example, due to resistor overheating.

Resistor control sequence during

Control functions

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