Setting Guidelines - ABB RELION 670 SERIES Applications Manual

Line distance protection

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Secondary system supervision

Setting guidelines

GlobalBaseSel: Selects the global base value group used by the function to define IBase,

VBase and SBase as applicable.

Current circuit supervision CCSSPVC (87) compares the residual current from a three-

phase set of current transformer cores with the neutral point current on a separate input

taken from another set of cores on the same current transformer.

IMinOp: It must be set as a minimum to twice the residual current in the supervised CT

circuits under normal service conditions and rated primary current.

Pickup_Block: It is normally set at 150% to block the function during transient conditions.

The FAIL output is connected to the blocking input of the protection function to be

blocked at faulty CT secondary circuits.

Fuse failure supervision FUFSPVC

Identification

Function description

Fuse failure supervision

Different protection functions within the protection IED, operates on the basis of the

measured voltage in the relay point. Examples are:

impedance protection functions

undervoltage function

energizing check function and voltage check for the weak infeed logic

These functions can operate unintentionally if a fault occurs in the secondary circuits

between the voltage instrument transformers and the IED.

It is possible to use different measures to prevent such unwanted operations. Miniature

circuit breakers in the voltage measuring circuits should be located as close as possible to

the voltage instrument transformers, and shall be equipped with auxiliary contacts that are

wired to the IEDs. Separate fuse-failure monitoring IEDs or elements within the

identification

Line distance protection REL670 2.2 ANSI

1MRK 506 369-UUS -

ANSI/IEEE C37.2

device number

Application manual