ABB REC670 Product Manual page 8

Bay control REC670
Pre-configured
Product version: 1.1
CCRBRF can be single- or three-phase
initiated to allow use with single phase
tripping applications. For the three-phase
version of CCRBRF the current criteria can be
set to operate only if two out of four for
example, two phases or one phase plus the
residual current start. This gives a higher
security to the back-up trip command.
CCRBRF function can be programmed to give
a single- or three-phase re-trip of the own
breaker to avoid unnecessary tripping of
surrounding breakers at an incorrect
initiation due to mistakes during testing.
Pole discordance protection CCRPLD
Single pole operated circuit breakers can due
to electrical or mechanical failures end up
with the different poles in different positions
(close-open). This can cause negative and
zero sequence currents which gives 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 breaker should be
tripped to clear the unsymmetrical load
situation.
The Polediscordance protection function
CCRPLD operates based on information from
auxiliary contacts of the circuit breaker for
the three phases with additional criteria from
unsymmetrical phase current 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 number of applications where such
functionality is needed. Some of them are:
• detection of reversed active power flow
• detection of high reactive power flow
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1MRK 511 192-BEN B
Each function has two steps with definite
time delay. Reset times for every step can be
set as well.
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 protection
Two step undervoltage protection
UV2PTUV
Undervoltages can occur in the power system
during faults or abnormal conditions. Two
step undervoltage protection (UV2PTUV)
function can be used to open circuit breakers
to prepare for system restoration at power
outages or as long-time delayed back-up to
primary protection.
UV2PTUV has two voltage steps, each with
inverse or definite time delay.
Two step overvoltage protection OV2PTOV
Overvoltages may occur in the power system
during abnormal conditions, such as, sudden
power loss, tap changer regulating failures,
open line ends on long lines.
Two step overvoltage protection OV2PTOV
can be used as open line end detector,
normally then combined with directional
reactive over-power function or as system
voltage supervision, normally then giving
alarm only or switching in reactors or switch
out capacitor banks to control the voltage.
OV2PTOV has two voltage steps, each of
them with inverse or definite time delayed.
OV2PTOV has an extremely high reset ratio
to allow setting close to system service voltage.
Two step residual overvoltage protection
ROV2PTOV
Residual voltages may occur in the power
system during earth faults.
Issued: June 2010
ABB