Control - Hitachi Relion 670 Series Product Manual

Phasor measurement unit RES670
Version 2.2
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.
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.
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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
nd
features of 2 harmonic blocking and 3
nd
level adaption. The 2 harmonic blocking 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. QCBAY also
provides blocking functions that can be distributed to
different apparatuses within the bay.
Local remote LOCREM/Local remote control
LOCREMCTRL
The signals from the local HMI or from an external local/
remote switch are connected via the function blocks local
remote (LOCREM) and local remote control
(LOCREMCTRL) to the Bay control (QCBAY) function block.
The parameter ControlMode in function block LOCREM is
set to choose if the switch signals are coming from the local
HMI or from an external hardware switch connected via
binary inputs.
Logic rotating switch for function selection and LHMI
presentation SLGAPC
The logic rotating switch for function selection and LHMI
presentation (SLGAPC) (or the selector switch function
block) is used to get an enhanced selector switch
functionality compared to the one provided by a hardware
selector switch. Hardware selector switches are used
extensively by utilities, in order to have different functions
operating on pre-set values. Hardware switches are
1MRK 511 410-BEN P
rd
harmonic start
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M13447-3 v8
M17086-3 v11
SEMOD114908-4 v11
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