Method and device for simulating dynamic turn-to-turn short circuit of excitation winding

Abstract

The invention discloses a method and device for simulating a dynamic inter-turn short circuit of an excitation winding. The device comprises: a short-circuit tap connected to the excitation winding of a generator; a slip ring is installed on the rotating shaft of the generator; The slot is connected to the slip ring; the slip ring electrically connects the short-circuit tap to the short-circuit board through the brush; the brush is connected to the terminal on the short-circuit board through the wire, so that the corresponding terminals on the terminal board can achieve different short-circuit degrees The periodic short circuit mechanism can realize the periodic opening and closing of the circuit, thereby simulating the periodic breakdown of the excitation winding between turns, that is, simulating the dynamic inter-turn short circuit of the excitation winding. Through the device for simulating the dynamic turn-to-turn short circuit of the excitation winding provided by the invention, the fault characteristics of the fault can be discovered and studied through the method of experimental research, and a diagnosis basis can be provided for timely troubleshooting of the fault.

Description

technical field [0001] The invention relates to the technical field of generators, and more specifically relates to a method and device for simulating a dynamic inter-turn short circuit of an excitation winding. Background technique [0002] The insulation capacity of the rotor winding decreases due to insulation aging, damage, etc. After that, due to unit vibration and other reasons, the weak point of the inter-turn insulation of the winding may periodically reach the breakdown condition. After the rotor winding is broken down, it will cause a short circuit between the turns of the rotor winding. [0003] see Figure 1a , Figure 1a is the axial cross-sectional view of uniform winding of the rotor winding. When the winding of the rotor winding is uneven, there is a certain distance h between the winding turns, such as Figure 1b . When there are weak points in the winding insulation layer due to aging, wear and other reasons, because there is still a certain distance h be...

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Problems solved by technology

[0004] According to field observation experience, there is indeed a dynamic turn-to-turn short-circuit fault in the excitation winding when the generator is running, but the research on its fault characteristics is very limited, so it is impossible to achieve real-time online monitoring of the fault, which eventually leads to the inability to eliminate the fault in time And lead to serious consequences, causing a lot of economic losses, endangering the safety of staff

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