ABB REL650 Product Manual page 20

Line distance protection REL650 ANSI
Product version: 1.3
An alarm pickup gives early warning to allow operators to take
action well before the line is tripped.
Estimated time to trip before operation, and estimated time to
reclose after operation are presented.
Breaker failure protection CCRBRF, 3-phase activation and
output (50BF)
CCRBRF (50BF) can be current based, contact based, or an
adaptive combination of these two conditions.
Breaker failure protection (CCRBRF, 50BF) ensures fast back-up
tripping of surrounding breakers in case the protected breaker
fails to open. CCRBRF (50BF) can be current based, contact
based, or an adaptive combination of these two conditions.
Current check with extremely short reset time is used as check
criterion to achieve high security against inadvertent operation.
Contact check criteria can be used where the fault current
through the breaker is small.
Breaker failure protection, 3-phase activation and output
(CCRBRF, 50BF) current criteria can be fulfilled by one or two
phase currents the residual current, or one phase current plus
residual current. When those currents exceed the user defined
settings, the function is triggered. These conditions increase the
security of the back-up trip command.
CCRBRF (50BF) function can be programmed to give a three-
phase re-trip of the protected breaker to avoid inadvertent
tripping of surrounding breakers.
Breaker failure protection, phase segregated activation and
output (50BF)
Breaker failure protection for single pole tripping applications
CSPRBRF (50BF) ensures fast back-up tripping of surrounding
breakers in case the protected breaker fails to open. CSPRBRF
(50BF) can be current based, contact based, or adaptive
combination between these two principles.
A current check with extremely short reset time is used as a check
criterion to achieve a high security against inadvertent operation.
A contact check criteria can be used where the fault current
through the breaker is small.
CSPRBRF (50BF) function current criteria can be fulfilled by one
or two phase currents, or one phase current plus residual current.
When those currents exceed the user defined settings, the
function is activated. These conditions increase the security of the
back-up trip command.
CSPRBRF (50BF) can be programmed to give a single- or three-
phase re-trip of the protected breaker to avoid inadvertent
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tripping of surrounding breakers at an incorrect initiation due to
mistakes during testing.
Stub protection STBPTOC (50STB)
When a power line is taken out of service for maintenance and the
line disconnector is opened, line side voltage transformers will be
on the disconnected part of the line. The primary line distance
protection will thus not be able to operate and must be blocked.
The stub protection STBPTOC (50STB) covers the zone between
the current transformers and the open disconnector. The three-
phase instantaneous overcurrent function is released from a
normally open, 89b auxiliary contact on the line disconnector.
Pole discordance protection CCRPLD (52PD)
Circuit breakers and disconnectors can end up with their phases
in different positions (close-open), due to electrical or mechanical
failures. 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 affected breaker is tripped to correct such a
situation. If the situation warrants the surrounding breakers
should be tripped to clear the unsymmetrical load situation.
The pole discrepancy function operates based on information
from the circuit breaker logic with additional criteria from phase
selective current unsymmetry.
Broken conductor check BRCPTOC (46)
Conventional protection functions can not detect the broken
conductor condition. Broken conductor check BRCPTOC (46)
function, consisting of continuous phase selective current
unsymmetrical check on the line where the IED is connected will
give alarm or trip at detecting broken conductors.
Directional over/underpower protection GOPPDOP/GUPPDUP
(32/37)
The directional over-/under-power protection GOPPDOP (32)/
GUPPDUP (37) 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
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.
Negative sequence based overcurrent function DNSPTOC (46)
Negative sequence based overcurrent function DNSPTOC (46)
may be used in power line applications where the reverse zero
1MRK 506 337-BUS B
ABB