Injection type rotor grounding protection secondary circuit disconnection determination device and method, and injection type rotor grounding protection secondary circuit disconnection protection method
A rotor grounding and secondary circuit technology, applied in emergency protection circuit devices, instruments, electrical components, etc., can solve the problems of disconnection without considering the circuit damage, the refusal of the rotor grounding protection of the protection device, etc., to prevent the refusal of the rotor grounding protection. moving effect
Active Publication Date: 2019-12-03
NR ELECTRIC CO LTD +1
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Problems solved by technology
[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a secondary circuit breakage judging device, judgment method and protection method of the injected rotor grounding protection, and solve the problem that the injection rotor grounding protection does not consider circuit damage in the prior art. Possibility of disconnecting wires, resulting in the technical problem that the protection device may refuse to operate the rotor grounding protection
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[0023] Aiming at the situation that the rotor grounding protection refuses to operate due to the disconnection fault of the rotor secondary circuit, the invention provides an injection type rotor grounding protection secondary circuit disconnection judging device, judging method and protection method. The principle is as follows: theoretical analysis shows that the injection At the moment when the square wave power supply voltage is switched, the level change will cause the generator rotor winding to charge and discharge the ground capacitance, and then generate a charging and discharging transient current on the sampling resistor. When a high-power resistance of a certain injection circuit is disconnected, the equivalent capacitance in the circuit decreases, and the corresponding transient current of the sampling resistor charging and discharging will also decrease. Through simulation analysis, it is found that the transient state of the two cases at the instant of 20ms delay i...
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The invention discloses an injection type rotor grounding protection secondary circuit disconnection determination device and method, and an injection type rotor grounding protection secondary circuitdisconnection protection method. The device comprises a sampling resistor voltage acquisition module, a transient current calculation module, a loop disconnection current threshold calculation moduleand a disconnection discrimination module, which are used for respectively measuring sampling resistor voltages under two working conditions that an injection type rotor grounding loop is normal andone injection loop high-power resistor is disconnected, and calculating the transient currents of the sampling resistor under the two working conditions; a loop disconnection current threshold is determined according to the transient currents of the sampling resistor under the two working conditions; and when the real-time transient current of the sampling resistor is smaller than the loop disconnection current threshold, it is determined that the injection type rotor grounding protection secondary loop is disconnected. The protection device acts after short time delay and outputs an alarm. According to the invention, the injection type rotor secondary circuit disconnection fault can be identified, a user is reminded of maintenance, and rotor grounding protection refusal caused by the rotor secondary circuit disconnection fault is avoided.
Description
technical field [0001] The invention belongs to the technical field of electric power system relay protection, and relates to an injection type rotor grounding protection secondary circuit disconnection judging device, judging method and protection method. Background technique [0002] Rotor ground faults are common in generator faults, so the reliability of rotor ground fault protection becomes very important. Injection-type rotor ground protection is one of the most widely used rotor ground protection methods in the field. A high-power resistor is connected in series in the secondary circuit of the injection-type rotor ground protection. Due to the high excitation voltage and large harmonic content of the rotor circuit, long-term After operation, the secondary circuit of the rotor may be damaged and disconnected, especially the damage of high-power resistors is more common. If the generator rotor has a ground fault after the secondary circuit is disconnected, the ground r...
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IPC IPC(8): H02H7/08G08B21/18
CPCG08B21/185H02H7/08
Inventor 钟守平王光陈俊张琦雪陈佳胜郭自刚
Owner NR ELECTRIC CO LTD