ABB RELION REX640 Technical Manual page 276

Protection and control

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Table of Contents

Basic functions

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

Table 260: Special conditions

U3P1/U3P2/U3P3/U3P4

connected to real measure-

URES1/URES2/URES3/URES4

Operation principle

The function can be enabled and disabled with the

corresponding parameter values are "on" and "off".

The switch logic depends on inputs SWITCH_TO2, SWITCH_TO3 and SWITCH_TO4.

Source 1 is selected as default and switching is done on increased priority.

Table 261: Switching operation

Control input signals

No difference

See the preprocessing function blocks in this document for the possible

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

For this function, the setting is hidden and fixed to "on".

GRPOFF signal must be connected to unused voltage inputs. GRPOFF

signal is available as output from the Protection function block.

Residual voltage (measured or calculated)

The function requires that at least one voltage channel is

connected. The function requires that all the U3Px that are

connected to real source must be capable of providing (at

least) the same data that the default source U3P1 is capable

of. E.g. if the source UTVTR conneted to U3P1 has two inputs

) connected then others need to also have at

least two inputs connected (e.g.

The function requires that all three voltage channels are con-

nected to calculate the residual voltage. Setting

tion must be "Wye" in that particular UTVTR.

1MRS759142 F

Operation setting. The

Technical Manual