TE 1605341 VER02 1605340-05 control module

TE 1605341 VER02 1605340-05 control module

Technical data of product parameters

The stability limit of a turbo-alternator with or without step-up
transformer is illustrated in Fig. 4.17, at the upper left as a TE 1605341 VER02 1605340-05
function of the impedance measured at the generator terminals
and at the upper right as a power diagram. The operation of the
protection is set to the circle (lower left of Fig. 4.17) to avoid
tripping during a fault or power swings on the power system. The
setting range permits the protection chaacteristic to be adjusted
to the stability limit curve (see upper left of Fig. 4.17) which is
applicable whether the generator is connected to a step-up
transformer or directly to a busbar.This is a discriminative ground fault scheme for generators with TE 1605341 VER02 1605340-05 ungrounded star-points. It covers 80 % of the winding and operates on the basis of a directional zero-sequence component in the various generator feeders. Since the capacitive component
of a ground fault current does not usually provide a sufficiently
reliable criterion for determining the feeder concerned, the
ground fault current is artificially increased by adding a real
power component. The latter is generated by either three singlephase v.t’s or a three-phase v.t. In either case the secondaries
are connected as a broken delta across which a resistor (Re) is
briefly switched after a ground fault has been detected. The
grounding transformers or transformer are connected to the
busbars and are continuously under voltage. The number of
generator feeders can varyInitially a ground fault is detected non-discriminately due to the TE 1605341 VER02 1605340-05
occurrence of a neutral voltage measured by a sensitively set
voltage function. The grounding resistor Re is switched in circuit
after a short delay (t1 = 0.1 s) to prevent operation during power
system transients. Only then is the ground fault current large
enough to enable the power functions on the generators to
decide whether the ground fault is on their generator feeder or
not. The delay for the power function is set to isolate the fault
after 0.5 s. The grounding resistor Re is connected for 1.9 s. The

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