General Calculation; Secondary System Supervision; Control - ABB Relion 670 Series Product Manual

Phasor measurement unit RES670
Version 2.2
of the earth fault from the directional earth fault
protection function.

10. General calculation

Multipurpose filter SMAIHPAC
The multi-purpose filter function block (SMAIHPAC) is
arranged as a three-phase filter. It has very much the
same user interface (e.g. inputs and outputs) as the
standard pre-processing function block SMAI. However
the main difference is that it can be used to extract any
frequency component from the input signal. Thus it can,
for example, be used to build sub-synchronous
resonance protection for synchronous generator.

11. Secondary system supervision

Current circuit supervision CCSSPVC
Open or short circuited current transformer cores can
cause unwanted operation of many protection functions
such as differential, earth-fault current and negative-
sequence current functions.
Current circuit supervision (CCSSPVC) 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
current transformer.
A detection of a difference indicates a fault in the circuit
and is used as alarm or to block protection functions
expected to give inadvertent tripping.
Fuse failure supervision FUFSPVC
The aim of the fuse failure supervision function
(FUFSPVC) is to block voltage measuring functions at
failures in the secondary circuits between the voltage
transformer and the IED in order to avoid inadvertent
operations that otherwise might occur.
The fuse failure supervision function basically has three
different detection methods, negative sequence and
zero sequence based detection and an additional delta
voltage and delta current detection.
The negative sequence detection algorithm is
recommended for IEDs used in isolated or high-
impedance earthed networks. It is based on the
negative-sequence quantities.
The zero sequence detection is recommended for IEDs
used in directly or low impedance earthed networks. It is
based on the zero sequence measuring quantities.
The selection of different operation modes is possible
by a setting parameter in order to take into account the
particular earthing of the network.
Hitachi Power Grids
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© Copyright 2017 Hitachi Power Grids. All rights reserved
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, which in practice is more associated with
voltage transformer switching during station
operations.
Voltage based delta supervision DELVSPVC
Delta supervision function is used to quickly detect
(sudden) changes in the network. This can, for example,
be used to detect faults in the power system networks
and islanding in grid networks. Voltage based delta
supervision (DELVSPVC) is needed at the grid
interconnection point.
Current based delta supervision DELISPVC
Delta supervision function is used to quickly detect
(sudden) changes in the network. This can, for example,
be used to detect disturbances in the power system
network. Current based delta supervision (DELISPVC)
provides selectivity between load change and the fault.
Present power system has many power electronic
devices or FACTS devices, which injects a large number
of harmonics into the system. The function has
additional features of 2
harmonic start level adaption. The 2
secures the operation during the transformer charging,
when high inrush currents are supplied into the system.
Delta supervision of real input DELSPVC
Delta supervision functions are used to quickly detect
(sudden) changes in the power system. Real input delta
supervision (DELSPVC) function is a general delta
function. It is used to detect the change measured
qualities over a settable time period, such as:
• Power
• Reactive power
• Temperature
• Frequency
• Power factor

12. Control

Circuit breaker SXCBR
The purpose of Circuit breaker (SXCBR) is to provide the
actual status of positions and to perform the control
operations, that is, pass all the commands to primary
apparatuses in the form of circuit breakers via binary
output boards and to supervise the switching operation
and position.
Bay control QCBAY
The Bay control (QCBAY) function is used together with
Local remote and local remote control functions to
handle the selection of the operator place per bay.
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nd
harmonic blocking and 3
nd
harmonic blocking
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M13489-3 v6
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