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Line distance protection

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1MRK 506 369-UUS -

Line distance protection REL670 2.2 ANSI

Application manual

BLOCK: The input will block the operation of the Overexcitation protection OEXPVPH

(24), for example, the block input can be used to block the operation for a limited time

during special service conditions.

RESET: OEXPVPH (24) has a thermal memory, which can take a long time to reset.

Activation of the RESET input will reset the function instantaneously.

Recommendations for Output signals

Please see the default factory configuration for examples of configuration.

ERROR: The output indicates a measuring error. The reason, for example, can be

configuration problems where analogue signals are missing.

BFI: The BFI output indicates that the level Pickup1> has been reached. It can be used to

initiate time measurement.

TRIP: The TRIP output is activated after the operate time for the V/f level has expired.

TRIP signal is used to trip the circuit breaker(s).

ALARM: The output is activated when the alarm level has been reached and the alarm

timer has elapsed. When the system voltage is high this output sends an alarm to the

Settings

GlobalBaseSel: Selects the global base value group used by the function to define IBase,

VBase and SBase as applicable.

Operation: The operation of the Overexcitation protection OEXPVPH (24) can be set to

Enabled/Disabled.

MeasuredV: The phases involved in the measurement are set here. Normally the three

phase measurement measuring the positive sequence voltage should be used but when

only individual VT's are used a single phase-to-phase can be used.

MeasuredI: The phases involved in the measurement are set here. MeasuredI: must be in

accordance with MeasuredV.

Pickup1: Operating level for the inverse characteristic, IEEE or tailor made. The operation

is based on the relation between rated voltage and rated frequency and set as a percentage

factor. Normal setting is around 108-110% depending of the capability curve for the

transformer/generator.

Pickup2: Operating level for the t_MinTripDelay definite time delay used at high

overvoltages. The operation is based on the relation between rated voltage and rated

frequency and set as a percentage factor. Normal setting is around 110-180% depending

Voltage protection