Calculating Settings For Pole Discordance Protection Ccrpld (52Pd) - ABB Relion 650 Series Applications Manual

Section 3
REB650 setting examples
The fault
occurs
IEC05000479 V2 EN-US
Figure 7:
3.1.7 Calculating settings for pole discordance protection CCRPLD
(52PD)
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
The settings are made in primary values. The values of the base primary quantities are set in
Global base 1.
2. Set
3. Set
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
5. Set
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
The current detected shall be active if all phase currents are higher than the setting.
7. Set
Pole discrepancy is detected if the magnitude of the lowest phase current is lower than the
fraction
36
Protection
operate time
Normal t
cbopen
Retrip delay t1
Trip and Start
CCRBRF
Time sequences for breaker failure protection setting
GlobalBaseSel to 1
Operation to Enabled
tTrip to 3 s .
ContactSel to Enabled if the primary auxiliary contact circuits are connected.
CurrentSel to Continuous monitor .
CurrRelPU to 10 % of IBase .
CurrUnsymPU to 80% .
CurrUnsymPU (%) of the highest phase current.
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t after re-trip
cbopen
t
BFPreset
Minimum back-up trip delay t2
Critical fault clearance time for stability
1MRK 505 287-UUS B
Margin
Time
IEC05000479_2_en.vsd
GUID-B93BCB75-F3A0-4DF2-BD55-D10000B93D6C v2
Busbar protection REB650
Application manual