ABB Relion 650 Series Technical Manual page 221

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1MRK 506 326-UUS B

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Figure 113: Pole discrepancy external detection logic

This binary signal is connected to a binary input of the IED. The appearance of this signal will start

a timer that will give a trip signal after the set time delay.

Pole discrepancy can also be detected by means of phase selective current measurement. The

sampled analog phase currents are pre-processed in a discrete Fourier filter (DFT) block. From the

fundamental frequency components of each phase current the RMS value of each phase current is

derived. The smallest and the largest phase current are derived. If the smallest phase current is

lower than the setting

is started. The

long. The current based pole discrepancy function can be set to be active either continuously or

only directly in connection to breaker open or close command.

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Figure 114: Simplified block diagram of pole discrepancy function - contact and current

The pole discordance protection is blocked if the input signal BLOCK is high.

Line distance protection REL650

Technical manual

CurrUnsymPU times the largest phase current the settable trip timer ( tTrip )

tTrip timer gives a trip signal after the set delay. The TRIP signal is a pulse 150 ms

tTrip+200 ms

Unsymmetrical

current detection

poleDiscrepancy Signal from C.B.

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Current protection