DEVICE FOR PROTECTION OF SYNCHRONOUS GENERATOR, WHICH HAS FREQUENCY THYRISTOR-CONTROLLED START, FROM SHORT CIRCUIT TO GROUND OF STATOR WINDING

摘要

Using; device is intended for relaying synchronous generators as well as motors and compensators, thyristor starting device having the earth fault in the frequency of the thyristor start mode and when operating in the network. Summary of the invention: to provide 100% protection of the circuit in the generator stator winding ground is achieved in that the protection device to the output of the adder zero sequence voltages at the terminals and connected to the generator neutral filters of the third harmonic of the mains frequency (150 Hz) frequency and subharmonic , the outputs of which are respectively connected to first and second reactive bodies, output of the first reactant through the body member not connected to the first input of the aND gate, to the second input of which is connected an output of AND-NO element, whose first input is connected to the output of the second reactant body. In the event of a ground fault anywhere in the stator winding in the above modes superposed voltage disappears and the main role is played by natural harmonic EMF zero-sequence generator. The first reactant in the authority returns the null state, the output on the NOT element - a logic one level that block. incoming signal from the output of offline, the device is triggered. When zero perevodetiristornogo device in inverter mode power guiding body returns to its original state (zero), the switch is switched, and the generator is provided a second protection device channel. With the closure of the stator winding in the neutral zone invertorkom operation body operates the minimum voltage, which responds to decrease the voltage at the generator neutral and the generator is disconnected. 7 yl. 00 minutes w w h N3