ABB RELION REX640 Technical Manual page 944

Protection and control

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Protection functions

There are a few special conditions which must be noted with the configuration.

Table 905: Special conditions

U3P connected to real measurements

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 function consists of sub-functions which are described in the next sections.

Can be connected to GRPOFF if

voltage Meas is set to "Ph-to-ph without Uo"

See the preprocessing function blocks in this document for the possible

signal sources. The GRPOFF signal is available in the function block called

EF detection Mod GFC is set to "Io" or "Io AND IoRef" or Phase

EF detection Mod GFC is set

Necessary when

to "Io AND IoRef"

Three-phase voltages

Residual voltage (measured)

Necessary when

EF detection Mod GFC is set

to "Io OR Uo" or "Io AND Uo". Necessary also

if only main voltages are available but

voltage Meas is set to "Accurate".

The function can work with any two phase

voltage channels connected but it is recom-

mended to connect all three voltage chan-

Operation setting. The

1MRS759142 F

Technical Manual