CN2266223Y

CN2266223Y - Capacitance self-excitation medium frequency generator set

Info

Publication number: CN2266223Y
Application number: CN 96226069
Authority: CN
Inventors: 倪鉴清
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-04-29
Filing date: 1996-04-29
Publication date: 1997-10-29
Anticipated expiration: 2006-04-29

Abstract

The utility model relates to a generator set which is used for testing pressure resistance of a voltage mutual inductor or a power transformer in an induction mode. The generator set is formed by a reformed hexapolar capacitance self-excited generator or a reformed octapolar capacitance self-excited generator is driven by a trip-hase bipolar squirrel cage induction motor. The output end of the reformed hexapolar capacitance self-excited generator or the reformed octapolar capacitance self-excited generator is connected with a capacitor. Besides, a stator winding of the reformed hexapolar capacitance self-excited generator or the reformed octapolar capacitance self-excited generator and a cross section of a wire are redesigned. The utility model has the advantages of condensive load adaptability, good output waveform, simple structure, small size, light weight, simple operation and easy maintenance.

Description

Electric capacity auto-excitation type intermediate frequency generator group

The utility model is a kind of testing generator group that voltage transformer or power transformer are carried out induced over voltage withstand test.Say it is the electric capacity auto-excitation type frequency multiplication induced over voltage withstand test machine that is developed into the principle of electric capacity self-excitation electricity according to induction motor definitely.

The device that is widely used for now power transformer and voltage transformer are carried out induced over voltage withstand test both at home and abroad has two kinds: 1, a kind of frequency tripling generator of forming by three single-phase transformers, the volume of each element of this device is less, weight is lighter, be easy to carry, therefore in electric power system, adopt it to come voltage transformer is carried out induced over voltage withstand test, but because this device comes out according to the magnetic saturation principle design, output waveform is bad, can only single-phasely export, again can only output frequency 150HZ, and be subjected to influence that input voltage changes very greatly, therefore, do not adopted by transformer factory and instrument transformer manufactory.2, to be that wire wound asynchronous motor is counter drag and the synchronous generator unit another kind; These two kinds of devices can single-phasely be exported, and can export by three-phase again, and output waveform is better, and the synchronous generator unit can be designed different frequencies according to different instructions for uses, but since the volume of these two kinds of devices more greatly, heavier, be not easy to carry, so do not adopted by electric power system.

The purpose of this utility model is according to the shortcoming that exists in the problems referred to above, for the user provides a kind of new-type electric capacity auto-excitation type intermediate frequency generator group.

The utility model drives an improved sextupole by three-phase the two poles of the earth squirrel-cage induction motor or ends of the earth electric capacity self excited generator is formed; The excitation mode of generator is to insert suitable electric capacity at the stator winding leading-out terminal, renovation technique scheme to six grades or ends of the earth electric capacity auto-excitation type motor is: 1) to the transformation of stator: the number of turn of stator winding and wire glass: if output frequency is 150HZ, then every line of rabbet joint number is original (31-33) %, and conductor cross-section is original three times; If output frequency is 200HZ, then every line of rabbet joint number is original (23-25) %, and conductor cross-section is original four times; 2) to the transformation of rotor: cancellation fan and fan base, will be to large-size machine at two ends fan base place installing gimbal; 3) gap between rotor and the stator core is than original gap big (10-60) %.

After the utility model is realized, can be used for being with the capacitive load test, and can not produce resonance, compared with the prior art this device more also has following advantage: 1) good output waveform, 2) simple in structure firm, 3) volume is little, in light weight, 4) operation, operation, safeguard all simple.

Below in conjunction with accompanying drawing the utility model is further specified:

Fig. 1 is a perspective view of the present utility model;

Fig. 2 is a generator profile in the utility model;

Fig. 3 is the utility model circuit theory winding diagram;

Among the figure: 1-two utmost point squirrel cage induction motors, 2-is to wheel, 3-electric capacity auto-excitation type intermediate frequency generator, 4-axle, 5-stator line chart, 6-stator core, 7-cast-aluminum rotor, 8-air gap, 9-bearing, 10-shell.

Two utmost point squirrel cage induction motors should select: voltage 6KV, power 440KW, rotating speed 2960r/min; Generator: three-phase sextupole, squirrel cage induction motor, cast-aluminum rotor, voltage 6KV, power 310KW, electric current 37A, rotating speed 1000r/min, 1.3mm is elected in the stator rotor gap as, stator winding was that 6 tunnel series connection change two-way three tunnel parallel connections of connecting into originally, cancellation fan and fan base, and this place's axle needs finish turning; At fan base place installing gimbal, the heating interference fit is fixed on the fan base place, and is fastened on the support with 4 * M12, and two ends are all supported with 324 ball bearings; The finish turning rotor makes between rotor and stator air gap by 1.3mm transformation 2.2mm, magnetizing capacitance 10KV, 7.5uF.After above-mentioned transformation, these two squirrel cage induction motors are used just becomes an electric capacity auto-excitation type intermediate frequency generator group to taking turns direct connection.The output frequency of unit is 150HZ, and output voltage is 7KV, and output current is 142A, and output capacity is 1000KVA.

Claims

1. electric capacity auto-excitation type intermediate frequency generator group, form by improved sextupole of three-phase the two poles of the earth squirrel-cage induction motor drive or ends of the earth electric capacity self excited generator, it is characterized in that: the excitation mode of generator is at the leading-out terminal of stator winding and connects an electric capacity that sextupole or ends of the earth electric capacity self excited generator are by being connected with three-phase the two poles of the earth squirrel-cage induction motor to wheel.

2. a kind of electric capacity auto-excitation type intermediate frequency generator group as claimed in claim 1, it is characterized in that: the renovation technique scheme of sextupole or ends of the earth electric capacity auto-excitation type motor is: 1) to the transformation of stator: with the number of turn and the wire glass transformation of stator winding, if output frequency is 150HZ, then every line of rabbet joint number is original (31-33) %, conductor cross-section is original 3 times, if output frequency is 200HZ, then every line of rabbet joint number is original (23-25) %, and conductor cross-section is original 4 times; 2) to the transformation of rotor: cancellation fan and fan base, will be to large-size machine at two ends fan base place installing gimbal; 3) gap between rotor and the stator core is than original gap big (10-60) %.