Equipment and method for searching ground fault point of generator stator winding bar

Abstract

The invention relates to equipment for searching a ground fault point of a generator stator winding bar. The equipment comprises a regulation circuit and a detector; the inside of the regulation circuit is connected with a current relay; and by the current relay, a current accessing the regulation circuit does not exceed 5A, so that reoccurrence of a short circuit burn of a generator stator iron core is effectively avoided. According to the method using the equipment, a voltage is applied to a fault phase of the generator stator winding bar, the current reaches the ground through the ground fault point of the stator winding bar and is returned to a ground terminal (i.e., a ground end applying the voltage) of the regulation circuit to form a loop, and no current flows between an end which is not applied with the voltage and the fault point. The detector measures the current of the ground fault phase (the winding bar) of a generator stator, and when a measured value of an ammeter of thedetector is suddenly changed and for example, the current is suddenly changed into 0 or nearly 0 from a high value, the ground fault point is positioned at a current sudden change position, so that the ground fault point of the generator stator winding bar can be accurately and rapidly found and the precondition is provided for accurately and rapidly processing such type of fault.

Description

technical field

[0001] The invention relates to the technical field of electrical fault detection, in particular to a device and a method for finding a ground fault point of a stator bar of a generator. Background technique

[0002] Large and medium-sized generators have large stators and complex wiring. It takes a lot of energy and time to accurately find the ground fault point of small particles. The traditional equipment for finding the grounding fault point of the stator bar of the generator does not control the connected current. By applying a grounding current greater than 5A to the equipment, smoke and arcs are generated to find the grounding point visually. The traditional generator stator grounding search method may burn the stator core, resulting in greater losses. Especially for large-scale generators, repairing the iron core requires a lot of financial resources, special materials, special tools, instruments, and corresponding professionals, and the loss of powe...

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