CN1302493C

CN1302493C - Method of lowering impact induction potential of large volume autotransformer

Info

Publication number: CN1302493C
Application number: CNB200410050672XA
Authority: CN
Inventors: 高兴耀; 钟俊涛; 孙勇
Original assignee: TBEA Shenyang Transformer Group Co Ltd
Current assignee: TBEA Shenyang Transformer Group Co Ltd
Priority date: 2004-10-26
Filing date: 2004-10-26
Publication date: 2007-02-28
Anticipated expiration: 2024-10-26
Also published as: CN1601667A

Abstract

The present invention relates to a method of lowering impact induction potential of a large capacity autotransformer. The present invention provides a lightning preventing and impact potential preventing method suitable for a super-large capacity loading voltage regulation autotransformer in view of defects existing in a defence method for the breakdown harm, the short circuit harm, the firing harm, etc. created on electric products by lightning impulse waves. The method installs a capacitor for absorbing impulse wave potential on an excitation II winding controlling the change of magnetic flux, and the capacitor is connected with the winding in parallel. The capacitance of the capacitor is from 9000 to 12000PF, and the impulse withstand voltage value is from 475KV to 525KV. The method has high capability for absorbing the impulse wave potential, high safety and reliability and is favorable to improving the production quality and reducing the cost.

Description

A kind of method that reduces big capacity autotransformer impact induced potential

Technical field

The present invention relates to a kind of method that big capacity autotransformer impacts induced potential that reduces, especially about reducing the method that the vast capacity autotransformer impacts induced potential.

Background technology

Present commercially available autotransformer, in order to reduce or weaken the destruction of lightning surge to autotransformer, in transformer, adopt shielding actuating coil method usually, improve dielectric strength or the lightning arrester method is set in transformer, first kind of way can make volume of transformer increase, second kind of way can make cost increase, and the third way does not allow to use sometimes.

Summary of the invention

In order to overcome the existing in prior technology weak point, the invention provides a kind of vast capacity self-coupling on-load voltage-regulating transformer that is used for and reduce the also appearance method of impacting induced potential, this method is simple in structure, reliable, reaction speed is fast, it is strong to absorb the shock wave ability, and the duty volume is little, and cost is low.

The technical solution adopted for the present invention to solve the technical problems is: it comprises the common winding that persevering magnetic flux device is provided with on one's body, excitatory I winding, pressure regulation winding; Become series connection winding, excitatory II winding that the magnetic flux device is provided with on one's body; The wherein common winding and the windings in series of connecting; Excitatory I winding, excitatory II winding and pressure regulation windings in series; Excitatory II winding is provided with the electric capacity that is used to absorb the shock wave current potential, and in parallel with it, and its capacitance is 9000～12000PF, and the impulse withstand voltage value is 475KV～525KV.

The invention has the beneficial effects as follows: it is strong to absorb the shock wave ability, and anti-thunder and lightning is effective, safe and reliable, and the duty volume is little, and cost is low, is particularly suitable for using on the vast capacity autotransformer.

Description of drawings

Figure is a circuit structure principle schematic of the present invention;

Among the figure: 1 permanent magnetic flux device body, 2 becomes magnetic flux device body, MV _1-3Common winding, GV _1-3Excitatory I winding, TV _1-3Pressure regulation winding, HV _1-3Series connection winding, JV _1-3Excitatory II winding, C _1-3Electric capacity, K on load tap changer.

Embodiment

The present invention as shown in the figure, it includes by permanent magnetic flux device body 1 and becomes the magnetic circuit part that magnetic flux device body 2 is formed; By common winding MV _1-3, excitatory I winding GV _1-3, pressure regulation winding TV _1-3, series connection winding HV _1-3, excitatory II winding JV _1-3The circuit part of forming; Wherein be located at the common winding MV on the permanent magnetic flux device body 1 _1-3Be located at the winding HV that connects that becomes on the magnetic flux device body 2 _1-3Series connection respectively after the grouping; Be located at the excitatory I winding GV on the permanent magnetic flux device body 1 _1-3With the excitatory II winding JV that is located on the change magnetic flux device body 2 _1-3Series connection respectively after the grouping; Excitatory I winding GV _1-3One end links to each other with on load tap changer K, pressure regulation winding TV _1-3The head and the tail two ends respectively with+,-terminal links to each other its pressure regulation winding TV _1-3Tapping point and excitatory II winding JV _1-3End divide into groups to link to each other pressure regulation winding TV respectively _1-3Set a plurality of tapping points are used for pressure regulation to be selected, and for reducing or reduce or cutting down the destruction of lightning impulse vibration potential to excitatory I winding, excitatory II winding, pressure regulation winding, in parallel being provided with absorbs the capacitor C that shock wave is used on excitatory II winding _1-3, its capacitance is 9000～12000PF, and the impulse withstand voltage value is 475KV～525KV, and the work coupling selects for use capacitance as showing:

Autotransformer capacity (MVA)	Excitatory II winding (number of turn)	Capacitance (PF)	Impulse withstand voltage value (KV)
Autotransformer capacity (MVA)	Excitatory II winding (number of turn)	Capacitance (PF)	Impulse withstand voltage value (KV)	300	120	9000±10％	500±5％
500	150	10000±10％	500±5％	300	120	9000±10％	500±5％
500	150	10000±10％	500±5％	900	200	12000±10％	500±5％

Claims

1. A method for reducing the impact induced potential of a large-capacity autotransformer, which includes a magnetic circuit part composed of a constant flux body and a variable flux body; it consists of a common winding MV _1-3 , an excitation I winding GV _{1 -3} . The circuit part composed of voltage regulating winding TV _1-3 , series winding HV _1-3 , and excitation II winding JV _1-3 ; among them, the common winding MV _1-3 set on the constant flux device and the magnetic field changer The series windings HV _1-3 on the fluxer are grouped and connected in series respectively; the excitation I windings GV _1-3 on the constant fluxer and the excitation II windings JV _1-3 on the flux changer are grouped and connected in series ;One end of the excitation I winding GV _1-3 is connected to the on-load tap changer K, and the first and last ends of the voltage regulating winding TV _1-3 are respectively connected to the + and - terminals, and the tap point of the voltage regulating winding TV _1-3 is connected to the excitation II The ends of the windings JV _1-3 are connected in groups. The characteristic is that the excitation II winding is equipped with a capacitor for absorbing the shock wave potential and connected in parallel with it. The capacitance is 9000-12000PF, and the shock withstand voltage is 475KV-525KV.