TSXPBY100 warehouse stock PLC DCS module

TSXPBY100 warehouse stock PLC DCS module

Technical data of product parameters

For a ground fault at the generator terminals, a real power current of 20 A results in a voltage of approximately 80 V, respectively 100 V at the input of the RE. 216. The lower of the two TSXPBY100
voltages takes the voltage drops of three single-phase v.t’s into
account. A current of 4 A and a voltage of 16 V are produced by
a ground fault at 20 % of the winding from the start-point. The
current at the input of the RE. 216 in the case of a core-balance
c.t. with a ratio of 100/1 A is 0.04 A, which corresponds to a
power of 0.64 W at 16 V. This is detected by the power functioThe ground fault protection of the entire stator winding comprises a 95 % scheme and a 100 % scheme (see Fig. 4.23). The
zones of the two schemes overlap in the stator windings. Ground
faults in the region of the generator terminals are detected
primarily by the 95 % stator ground fault scheme. Ground faults
near the star-point, on the other hand, can only be detected by
the 100 % stator ground fault scheme.The 100 % star-point scheme injects a voltage to permanently TSXPBY100
displace the star-point voltage. The injection voltage has an impulse waveform with an amplitude of about 100 V and a frequency of 12.5 or 15 Hz. It is provided by an injection unit Type
REX 010 and an injection transformer block REX 011. The
scheme measures the ground fault leakage resistance.The zone of the 100 % scheme depends on the maximum zerosequence current at fundamental frequency flowing at the starpoint. This occurs for a fault at the generator terminals. The lowfrequency injection voltage is switched off when the zerosequence current component at power system frequency exceeds 5 A. For a current of IE max = 20 A, the pick-up current of TSXPBY100
5 A is reached for a ground fault at 25 % of the winding from the
star-point. It is of advantage to limit the ground fault current to
IE max  5 A so that the zone of the 100 % scheme extends to the
whole stator winding.The rotor ground fault protection injects a voltage with an amplitude of 50 V and a frequency of 12.5 or 15 Hz to permanently
off-set the potential of the rotor circuit in relation to ground. The
scheme signals a ground fault when the leakage resistance of
the rotor circuit falls below the value set on the protection.
The injection voltage of 50 V is supplied by the same injection
unit Type REX 010 and injection transformer block Type REX 011
as are used for the stator ground fault scheme.

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

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