9.9.3 Setting guidelines
The parameters for the Pole discordance protection CCPDSC (52PD) are set via the local
HMI or PCM600.
The following settings can be done for the pole discrepancy protection.
GlobalBaseSel: Selects the global base value group used by the function to define IBase,
VBase and SBase as applicable.
Operation: Disabled or Enabled
tTrip: Time delay of the operation.
ContactSel: Operation of the contact based pole discrepancy protection. Can be set:
Disabled/PD signal from CB. If PD signal from CB is chosen the logic to detect pole
discrepancy is made in the vicinity to the breaker auxiliary contacts and only one signal is
connected to the pole discrepancy function. If the Pole pos aux cont. alternative is chosen
each open close signal is connected to the IED and the logic to detect pole discrepancy is
realized within the function itself.
CurrentSel: Operation of the current based pole discrepancy protection. Can be set:
Disabled/CB oper monitor/Continuous monitor. In the alternative CB oper monitor the
function is activated only directly in connection to breaker open or close command
(during 200 ms). In the alternative Continuous monitor function is continuously activated.
CurrUnsymPU: Unsymmetrical magnitude of lowest phase current compared to the
highest, set in % of the highest phase current. Natural difference between phase currents in
breaker-and-a-half installations must be considered. For circuit breakers in breaker-and-
a-half configured switch yards there might be natural unbalance currents through the
breaker. This is due to the existence of low impedance current paths in the switch yard.
This phenomenon must be considered in the setting of the parameter.
CurrRelPU: Current magnitude for release of the function in % of IBase.
9.10 Directional underpower protection GUPPDUP (37)
1MRK 506 369-UUS - Section 9
Current protection
Line distance protection REL670 2.2 ANSI 547
Application manual
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