ABB Relion 670 Series Product Manual page 34

Bay control REC670
Version 2.2
1. By external start signals which is internally latched
2. Follow external start signal only
3. Follow external start signal and the selected
FunctionMode
CCRBRF can be single- or three- phase initiated to allow
its use with single phase tripping applications. For the
three-phase application of the CCRBRF the current
criteria can be set to operate only if
operates out of three phases and neutral" for example;
two phases or one phase plus the residual current start.
This gives a higher security to the backup trip command.
The CCRBRF function can be programmed to give a
single- or three- phase retrip to its own breaker to avoid
unnecessary tripping of surrounding breakers at an
incorrect initiation due to mistakes during testing.
Stub protection STBPTOC
When a power line is taken out of service for
maintenance and the line disconnector is opened in
multi-breaker arrangements the voltage transformers
will mostly be outside on the disconnected part. The
primary line distance protection will thus not be able to
operate and must be blocked.
The stub protection (STBPTOC) covers the zone between
the current transformers and the open disconnector.
The three-phase instantaneous overcurrent function is
released from a normally open, NO (b) auxiliary contact
on the line disconnector.
Pole discordance protection CCPDSC
An open phase can cause negative and zero sequence
currents which cause thermal stress on rotating
machines and can cause unwanted operation of zero
sequence or negative sequence current functions.
Normally the own breaker is tripped to correct such a
situation. If the situation persists the surrounding
breakers should be tripped to clear the unsymmetrical
load situation.
The Pole discordance protection function (CCPDSC)
operates based on information from auxiliary contacts
of the circuit breaker for the three phases with
additional criteria from unsymmetrical phase currents
when required.
Directional over/underpower protection GOPPDOP/
GUPPDUP
The directional over-/under-power protection
(GOPPDOP/GUPPDUP) can be used wherever a high/low
active, reactive or apparent power protection or
alarming is required. The functions can alternatively be
used to check the direction of active or reactive power
flow in the power system. There are a number of
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M12902-3 v10
M13269-3 v15
SEMOD175421-4 v7
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applications where such functionality is needed. Some
of them are:
• detection of reversed active power flow
• detection of high reactive power flow
Each function has two steps with definite time delay.
Broken conductor check BRCPTOC
The main purpose of the function Broken conductor
check (BRCPTOC) is the detection of broken conductors
on protected power lines and cables (series faults).
Detection can be used to give alarm only or trip the line
breaker.
Voltage-restrained time overcurrent protection
VRPVOC
Voltage-restrained time overcurrent protection
(VRPVOC) function can be used as generator backup
protection against short-circuits.
The overcurrent protection feature has a settable
current level that can be used either with definite time
or inverse time characteristic. Additionally, it can be
voltage controlled/restrained.
One undervoltage step with definite time characteristic
is also available within the function in order to provide
functionality for overcurrent protection with
undervoltage seal-in.
Capacitor bank protection CBPGAPC
Shunt Capacitor Banks (SCB) are used in a power system
to provide reactive power compensation and power
factor correction. They are as well used as integral parts
of Static Var Compensators (SVC) or Harmonic Filters
installations. Capacitor bank protection (CBPGAPC)
function is specially designed to provide protection and
supervision features for SCBs.
Average Power Transient Earth Fault Protection
APPTEF
The APPTEF (Average Power Transient Earth Fault
Protection) function is a transient measuring directional
earth-fault protection. Determination of the earth fault
direction is based on the short-term built-up transient
at the beginning of the earth fault. This transient is to a
large extent independent of the neutral point treatment.
This means that the function can be used without any
modification in all types of high-impedance grounded,
resonant grounded or isolated power systems.
For a resonant grounded system, the correct directional
measurement is ensured regardless of how many
Petersen coils are used throughout the interconnected
power network. The function is not sensitive to the
actual compensation degree of the coils. It will operate
equally well in an under- or over-compensated system.
Parallel neutral resistor to the Petersen coil are not
1MRK 511 404-BEN N
SEMOD171446-5 v2
GUID-935E1CE8-601F-40E2-8D22-2FF68420FADF v6
GUID-D55CEBF7-9377-4E36-BD8B-533609048A1E v3
GUID-A16ED4BC-855F-4561-8512-B4F30775784F v1
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