Control - ABB Relion 670 Series Product Manual

Busbar protection REB670
Version 2.2
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.
Fuse failure supervision VDSPVC
Different protection functions within the protection IED
operates on the basis of measured voltage at the relay
point. Some example of protection functions are:
• Distance protection function.
• Undervoltage function.
• Energisation function and voltage check for the weak
infeed logic.
These functions can operate unintentionally, if a fault occurs
in the secondary circuits between voltage instrument
transformers and the IED. These unintentional operations
can be prevented by fuse failure supervision (VDSPVC).
VDSPVC is designed to detect fuse failures or faults in
voltage measurement circuit, based on phase wise
comparison of voltages of main and pilot fused circuits.
VDSPVC blocking output can be configured to block
functions that need to be blocked in case of faults in the
voltage circuit.
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
nd
features of 2 harmonic blocking and 3
nd
level adaption. The 2
operation during the transformer charging, when high inrush
currents are supplied into the system.
Hitachi Power Grids
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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

11. Control

Synchrocheck, energizing check, and synchronizing
SESRSYN
The Synchronizing function allows closing of asynchronous
networks at the correct moment including the breaker
closing time, which improves the network stability.
Synchrocheck, energizing check, and synchronizing
(SESRSYN) function checks that the voltages on both sides
of the circuit breaker are in synchronism, or with at least
one side dead to ensure that closing can be done safely.
SESRSYN function includes a built-in voltage selection
scheme for double bus and 1½ breaker or ring busbar
arrangements.
Manual closing as well as automatic reclosing can be
checked by the function and can have different settings.
For systems, which can run asynchronously, a
synchronizing feature is also provided. The main purpose of
the synchronizing feature is to provide controlled closing of
circuit breakers when two asynchronous systems are in
phase and can be connected. The synchronizing feature
evaluates voltage difference, phase angle difference, slip
frequency and frequency rate of change before issuing a
controlled closing of the circuit breaker. Breaker closing
time is a setting.
Autorecloser SMBRREC
The auto recloser (SMBRREC) function provides:
• high-speed and/or delayed auto reclosing
• single and/or three phase auto reclosing
• support for single or multi-breaker applications.
The auto recloser can be used for delayed busbar
restoration.
Up to five reclosing shots can be performed. The first shot
can be single-, two-, and /or three-phase depending on the
type of the fault and the selected auto reclosing mode.
Several auto reclosing functions can be provided for multi-
breaker arrangements. A priority circuit allows one circuit
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