Hydraulic turbogenerator short circuit drying process

A hydro-generator and generator technology, applied in the manufacture of motor generators, electrical components, electromechanical devices, etc., can solve the problems of hydro-generator windings damp, easily damaged insulating layer, long maintenance time, etc., and achieve loss of electrical energy. Small, low cost, reasonable structure design effect

Inactive Publication Date: 2009-10-07
HANGZHOU FUCHUNJIANG HYDROELECTRIC EQUIP
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the windings of hydro-generators are damp, and because it is not easy to fold and transport, the traditional drying method takes a long time to dry and maintain, the cost is high, and the insulation layer is easy to be damaged, and to provide a simple operation, safe and reliable In the drying process, the power loss is small, the drying efficiency is high, and the current can be adjusted in a large range, which can meet the drying requirements of various generator windings of small and medium-sized hydropower stations. Short-circuit drying method for hydro-generators

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Embodiment Construction

[0014] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0015] This embodiment takes the double-winding excitation wiring method as an example to illustrate. The double-winding includes reactance shunt and third harmonic excitation. Since the primary and secondary windings are equivalent to the primary and secondary coils of the transformer, after the main winding is short-circuited, the secondary winding cannot There is voltage again, but its rectification part can still be used, but the voltage of the power grid can be used as the excitation power supply after the step-down and current limiting. We use high-power heating wires to reduce voltage and limit current, and use the number of heating wires connected in parallel to adjust the excitation in stages. According to Ohm's law, the more heating wires connected in parallel, the smaller the impedance, the g...

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Abstract

The invention relates to a generator servicing technology field, especially a hydraulic turbogenerator short circuit drying process. The invention is characterized in that the three phase of electricity generator is short-circuited artificially, droved to by hydroturbine, and generates greater current sufficient to make electricity generator windings exothermic by forming loop with short circuit point through the lower chi-potential of stator winding with small quantity of adjustable exciter current, and dries itself with the heat of windings. The invention has the advantage of simple operation, small attrition of electric energy during the drying procedure, high efficiency, great adjustable extent of electrical current, and can conform to the drying request of all kinds of electricity generator windings in middle and small hydraulic power plant.

Description

technical field [0001] The invention relates to the technical field of generator maintenance, in particular to a short-circuit drying method for a hydraulic generator. Background technique [0002] The hydropower station near the reservoir and the river is relatively humid, which will make the stator winding and rotor winding of the generator damp, and the insulation will be damaged, resulting in a short circuit and current leakage. As a result, the unit cannot operate normally, and it also poses a certain threat to the safety of workers threat. Therefore, it is necessary to dry the generator windings. [0003] Generally, the drying treatment methods for motor windings include eddy current drying method, circulating hot air drying method, and microwave drying method. For example, the application number is ZL200710185378, a microwave drying machine and drying method. The materials are microwave-heated to make them lose moisture. This method is not suitable for drying the wi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K15/12
Inventor 吴玉泉
Owner HANGZHOU FUCHUNJIANG HYDROELECTRIC EQUIP
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