Voltage Protection - ABB Relion 670 Series Product Manual

Busbar protection REB670
Version 2.2
temperatures are reached. If the temperature continues to
increase to the trip value, the protection initiates a trip of the
protected transformer.
The estimated time to trip before operation is presented.
Breaker failure protection CCRBRF
Breaker failure protection (CCRBRF) ensures a fast backup
tripping of the surrounding breakers in case the own
breaker fails to open. CCRBRF measurement criterion can
be current based, CB position based or an adaptive
combination of these two conditions.
A current based check with extremely short reset time is
used as check criterion to achieve high security against
inadvertent operation.
CB position check criteria can be used where the fault
current through the breaker is small.
CCRBRF provides three different options to select how t1
and t2 timers are run:
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 "2 elements 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.
Breaker failure protection, single phase CCSRBRF
Breaker failure protection, single phase version (CCSRBRF)
ensures a fast backup tripping of the surrounding breakers
in case the own breaker fails to open. CCSRBRF
measurement criterion can be current based, CB position
based or an adaptive combination of these two conditions.
A current based check with extremely short reset time is
used as check criterion to achieve high security against
inadvertent operation.
CB position check criteria can be used where the fault
current through the breaker is small.
The CCSRBRF provides three different options to select
how t1 and t2 timers are run:
1. By external start signal which is internally latched
2. Follow the external start signal only
3. Follow external start signal and selected FunctionMode
Hitachi Power Grids
The CCSRBRF function can be programmed to give a retrip
to its own breaker to avoid unnecessary tripping of
surrounding breakers at an incorrect initiation due to
mistakes during testing.
Directional over/underpower protection GOPPDOP/
GUPPDUP
M11550-6 v19
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 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.
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.

7. Voltage protection

Two-step undervoltage protection UV2PTUV
Undervoltages can occur in the power system during faults
or abnormal conditions. The two-step undervoltage
protection function (UV2PTUV) can be used to open circuit
breakers to prepare for system restoration at power outages
or as a long-time delayed back-up to the primary protection.
UV2PTUV has two voltage steps, each with inverse or
definite time delay.
SEMOD127870-4 v7
It has a high reset ratio to allow settings close to the system
service voltage.
Two step overvoltage protection OV2PTOV
Overvoltages may occur in the power system during
abnormal conditions such as sudden power loss, tap
changer regulating failures, and open line ends on long
lines.
Two step overvoltage protection (OV2PTOV) function can
be used to detect open line ends, normally then combined
with a directional reactive over-power function to supervise
the system voltage. When triggered, the function will cause
an alarm, switch in reactors, or switch out capacitor banks.
OV2PTOV has two voltage steps, each of them with inverse
or definite time delayed.
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