PLC system CB6687-2L industrial automation control module DCS

PLC system CB6687-2L industrial automation control module DCS

Technical data of product parameters

The balanced CB6687-2L voltage function is intended mainly for preventing
incorrect voltage measurement by other devices.It compares the voltages (amplitudes) of two generally identical
voltage sources connected to the same busbar phase by phase.The function picks up when the difference between voltages of
the same phase exceeds a set pick-up value (V-Unbalance).
A tripping signal is emitted for the source with the lower voltage
(Trip-Line1 or Trip-Line2) and a general tripping signal (Trip)generated after a set time delay (Delay) and providing the
tripping condition remains fulfilled throughout the delay time.These signals are available for blocking protection and instrumentation connected to the faulty source and thus prevent false CB6687-2Ltripping or measurements.The tripping signals are maintained for the setting of the reset
time (t-Reset) after the tripping condition is no longer fulfilled.
The function is thus suitable for detecting v.t. circuit faults (fuse
failure) and faults on the protection and metering circuits connected to them.The underimpedance function serves as back-up protection forphase faults on the generator/transformer unit. It is faster and CB6687-2L
more sensitive than the overcurrent protection. Its disadvantage
is that the zone of protection is shorter than the differential protection, which serves as the main protection.
The underimpedance scheme is connected to the c.t’s at the
generator star-point and to the v.t’s at the generator terminals.
The underimpedance operating characteristic is a circle in the
R/X plane, whereby the origin represents the location of the v.t’s.
The zone of protection covers the generator windings the cables
and the step-up transformerThe setting of the underimpedance function is determined by the
short-circuit reactance of the step-up transformer. Otherwise, the
distance between the step-up transformer and the HV circuitbreaker is mostly too short to be able to discriminate reliably with CB6687-2the impedance setting between faults in the generator/transformer unit zone and faults on the other side of the HVcircuit-breaker. The impedance is thus set to 70 % of the transformer impedance, which at least includes the transformerwinding on the generator side in the zone of protection.

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This article from the temporal Ming sheng automation equipment co., LTD.,

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