Generator injected type stator ground protection combination type analog experiment panel and test method

Abstract

A composite-type simulation test panel for injected stator grounding protection of power generator comprises an injected power supply output connected with the low-voltage side of a grounding transformer, a load resistor connected with the low-voltage side of the grounding transformer and a middle CT arranged on the low-voltage side of the grounding transformer, wherein a current detection point is provided at the secondary side of the CT; voltage detection points are provided on both terminals of the load resistor; and a grounding transition resistor and a capacitor to ground are connected with the high-voltage side of the grounding transformer in parallel. A static simulation test method using the above device comprises following steps: selecting proper devices and wiring according to the principle; simulating the field ground fault; and debugging the protection device and the injected power supply device of the device to be tested according to 'technical description'. The dynamic simulation test method comprises the following steps: respectively hanging three-phase capacitors on terminals of a power generator; connecting a simulated ground point on a main chassis with the ground of a stator iron of the power generator; connecting the extraction terminal on the high-voltage side of the grounding transformer with the neutral point of the power generator; and connecting a transition resistor for simulating grounding with a simulated fault position of the power generator through an air switch.

Description

technical field [0001] The invention relates to an external power supply mode (injection type for short) stator grounding protection in generator relay protection, and mainly relates to a test device and a test method for a simulation test of generator injection type stator grounding protection. Background technique [0002] The generator stator ground fault protection in the generator relay protection is a relay protection method. The relay protection device judges whether the stator ground fault occurs in the generator by detecting the relevant voltage, current and other electrical quantities. A single-phase ground fault will quickly send out an alarm or trip signal. For serious stator grounding faults, trip quickly to disconnect the connection between the generator and the power system, and quickly demagnetize, so that the stator grounding fault current can drop rapidly, so as to protect the stator core of the generator from being damaged as much as possible. Seriously i...

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Problems solved by technology

At present, for the injection type stator grounding protection of generators, there is a lack of simulation tests and train

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