GE IS200TTURH1CFD IS230TNTRHIC turbine terminal board

GE IS200TTURH1CFD IS230TNTRHIC turbine terminal board

Technical data of product parameters

rors should the power system IS200TTURH1CFD IS230TNTRHIC frequency deviate from the
rated frequency fN and during transients. To prevent false
tripping during extreme variations of frequency, either the
pick-up setting can be increased or the balanced voltage
function can be blocked by a frequency function.

Differing primary rated voltages of the v.t’s can be compensated by appropriately setting the reference values of the
corresponding A/D channels. The adjusted reference values
then apply for all the protection functions connected to the
same channels.The protection monitors the voltages of the two v.t’s 1 and 2:
In the event of a fault (in this example an open-circuit lead in the
circuit of v.t. 1), the protection function detects an IS200TTURH1CFD IS230TNTRHICunbalance and
after the set delay time generates the tripping signals ‘Trip’ and
‘Trip-LinThe underimpedance function serves as back-up protection for
phase faults on the generator/transformer unit. It is faster and
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 transformer.The setting of the underimpedance function is determined by the IS200TTURH1CFD IS230TNTRHIC
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
the impedance setting between faults in the generator/transformer unit zone and faults on the other side of the HV
circuit-breaker. The impedance is thus set to 70 % of the transformer impedance, which at least includes the transformer
winding on the generator side in the zone of protection.
The setting of the underimpedance function is referred to rated
voltage and current.

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