ABB Relion REC670, Applications Manual

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13.1.3 Setting guidelines
M12397-17 v8
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.
13.2 Fuse failure supervision FUFSPVC
IP14556-1 v3
13.2.1 Identification
M14869-1 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fuse failure supervision FUFSPVC - -
13.2.2 Application
SEMOD113803-4 v10
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
Section 13
1MRK 511 401-UUS A
Secondary system supervision
294 Bay control REC670 2.2 ANSI
Application manual