Fuse Failure Supervision Fufspvc; Identification; Application - Hitachi Relion 670 Series Applications Manual

Section 13
Secondary system supervision
13.2

Fuse failure supervision FUFSPVC

13.2.1

Identification

Function description
Fuse failure supervision
13.2.2

Application

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 protection and monitoring devices are another possibilities.
These solutions are combined to get the best possible effect in the fuse failure supervision function
(FUFSPVC).
FUFSPVC function built into the IED products can operate on the basis of external binary signals from
the miniature circuit breaker or from the line disconnector. The first case influences the operation of all
voltage-dependent functions while the second one does not affect the impedance measuring functions.
The negative sequence detection algorithm, based on the negative-sequence measuring quantities is
recommended for use in isolated or high-impedance grounded networks: a high value of voltage 3V
without the presence of the negative-sequence current 3I
event.
The zero sequence detection algorithm, based on the zero sequence measuring quantities is
recommended for use in directly or low impedance grounded networks: a high value of voltage 3V
without the presence of the residual current 3I
cases where the line can have a weak-infeed of zero sequence current this function shall be avoided.
A criterion based on delta current and delta voltage measurements can be added to the fuse failure
supervision function in order to detect a three phase fuse failure. This is beneficial for example during
three phase transformer switching.
188
IEC 61850
identification
FUFSPVC
is a condition that is related to a fuse failure event. In
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IEC 60617 ANSI/IEEE C37.2
identification device number
- -
is a condition that is related to a fuse failure
2
Phasor measurement unit RES670
1MRK511407-UUS Rev. N
IP14556-1 v3
M14869-1 v4
SEMOD113803-4 v10
2
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Application manual