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Time
The fault
occurs
Protection
operate time
Trip and Start
CCRBRF
Normal t
cbopen
Margin
Retrip delay t1
t
cbopen
after re-trip
t
BFPreset
Minimum back-up trip delay t2
Critical fault clearance time for stability
IEC05000479_2_en.vsd
IEC05000479 V2 EN-US
Figure 7:
Time sequences for breaker failure protection setting
3.1.7
Calculating settings for pole discordance protection CCRPLD
(52PD)
GUID-B93BCB75-F3A0-4DF2-BD55-D10000B93D6C v2
Pole discordance protection (CCRPLD ,52PD) detects situations where the bus coupler breaker has
different switching states in the phases (one open and two closed or two open and one closed).
Pole discrepancy can be detected either from auxiliary breaker contact status or by current
measurement.
1.
Set
GlobalBaseSel to 1
The settings are made in primary values. The values of the base primary quantities are set in
Global base 1.
2.
Set
Operation to Enabled
3.
Set
tTrip to 3 s.
When asymmetry is detected, a trip signal is activated. The delay must be so long that
asymmetrical faults will not cause an unwanted trip.
4.
Set
ContactSel to Enabled if the primary auxiliary contact circuits are connected.
5.
Set
CurrentSel to Continuous monitor.
The detection by means of current measurement can be constantly activated (Continuous
monitor) or activated in connection of breaker actions only (CB oper monitor).
6.
Set
CurrRelPU to 10 % of IBase .
The current detected shall be active if all phase currents are higher than the setting.
7.
Set
CurrUnsymPU to 80%.
Pole discrepancy is detected if the magnitude of the lowest phase current is lower than the
fraction
CurrUnsymPU(%) of the highest phase current.
Section 3
1MRK 505 287-UUS B
REB650 setting examples
36
Busbar protection REB650
Application manual
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