ABB Relion 650 Series Applications Manual page 98

Section 7
Current protection
It is therefore important to detect situations with pole discrepancy of circuit breakers. When this
is detected the breaker should be tripped directly.
Pole discordance protection CCRPLD (52PD) will detect situation with deviating positions of the
poles of the protected circuit breaker. The protection has two different options to make this
detection:
• By connecting the auxiliary contacts in the circuit breaker so that logic is created and a signal
can be sent to the pole discrepancy protection, indicating pole discrepancy.
• Each phase current through the circuit breaker is measured. If the difference between the
phase currents is larger than a
protection will operate.
7.5.3 Setting guidelines
The parameters for the Pole discordance protection CCRPLD (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 ).
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.
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.
CurrRelPU : Current magnitude for release of the function in % of IBase .
92
CurrUnsymPU this is an indication of pole discrepancy, and the
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1MRK 505 287-UUS B
M13274-3 v6
Busbar protection REB650
Application manual