CN103928225A - Method for transforming 220 kV non-excitation voltage regulating transformer body into on-load voltage regulating transformer body - Google Patents

Abstract

The invention relates to a method for transforming a 220 kV non-excitation voltage regulating transformer body into an on-load voltage regulating transformer body. The method comprises the following steps that (1) the distances between a left iron core side yoke, a right iron core side yoke, an A phase iron core column, a B phase iron core column and a C phase iron core column are enlarged; (2) low-voltage windings are wound on the A phase iron core column, the B phase iron core column and the C phase iron core column again, high-voltage windings are wound outside the low-voltage windings, and voltage regulating windings are wound outside the high-voltage windings; (3) an upper iron yoke which is matched with the A phase iron core column, the B phase iron core column and the C phase iron core column is replaced; (4) taps are made on the voltage regulating windings, and through an on-load voltage regulating tapping switch, the taps with different directions and different numbers of turns are connected with the high-voltage windings in series. According to the method, improvement is conducted based on an existing transformer body, and replacing and purchasing of a new transformer are of no need. The no-load voltage ratio can be regulated anytime and anywhere, power outage is of no need, manpower and material resources are saved, and electricity selling benefits are increased.

Description

A kind of method that 220kV off circuit tap changing transfor mer device body is transform as to on-load tap-changing transformer device body

Technical field

The present invention relates to a kind of transformer body remodeling method, especially relate to a kind of method that 220kV off circuit tap changing transfor mer device body is transform as to on-load tap-changing transformer device body.

Background technology

Because power consumer is more and more higher to the requirement of the quality of power supply, cause the equipment that Utilities Electric Co. transmits electric power also to rise year by year, to guarantee providing electric power energy safe, energy-conservation, high-quality as user.Wherein, quality of voltage is exactly the important symbol of high-quality electric energy.The quality of voltage that circuit is carried be mainly to be determined by the voltage of substation bus bar, and the voltage of bus is to be determined by the no-load voltage ratio of main transformer of transformer substation.Can not charged adjustment no-load voltage ratio due to off circuit tap changing transfor mer, once therefore transformer is charged, the height of busbar voltage just can not be adjusted.If busbar voltage exceeds acceptability limit, need transformer to have a power failure and adjust no-load voltage ratio, then after the tests such as D.C. resistance, can again put into operation.Visible, off circuit tap changing transfor mer is only applicable to duty ratio compared with stability region.If load round the clock, seasonal variety is larger, off circuit tap changing transfor mer cannot meet the demand of frequent adjustment no-load voltage ratio so, on-load tap-changing transformer highlights special advantage, and it can carry out the adjustment of no-load voltage ratio whenever and wherever possible, has met the requirement of load side busbar voltage quality.At present, known 220kV off circuit tap changing transfor mer device body structure is to be made up of three-phase and five-pole iron core, low pressure winding, high pressure winding.Three-phase low-voltage winding is wrapped in respectively on three stems of three-phase and five-pole iron core, three-phase high-voltage winding is wrapped in respectively to low pressure winding skin, non-excitation pressure adjustment switch leads is connected with three-phase high voltage coil respectively.But once this kind of transformer puts into operation, tap just can not be adjusted, no-load voltage ratio is fixing, and output voltage stabilization is adjusted as needed, and must have a power failure and carry out.Due to electrical network, user is on the increase, and load prediction difficulty is large, cannot predict in advance the stable case of transformer output voltage, and therefore transformer need to carry out the adjustment of no-load voltage ratio whenever and wherever possible, to adapt to the requirement of load side quality of voltage.

Summary of the invention

Can not carry out the deficiency of no-load voltage ratio adjustment whenever and wherever possible in order to overcome existing 220kV off circuit tap changing transfor mer, the invention provides a kind of method that 220kV off circuit tap changing transfor mer device body is transform as to on-load tap-changing transformer device body, the method does not change transformer profile, can carry out the adjustment of no-load voltage ratio whenever and wherever possible.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of method that 220kV off circuit tap changing transfor mer device body is transform as to on-load tap-changing transformer device body, described 220kV off circuit tap changing transfor mer device body has three-phase and five-pole iron core, described three-phase and five-pole iron core is made up of two of left and right return yoke unshakable in one's determination, upper yoke, A phase iron core column, B phase iron core column and C phase iron core column, and the method comprises the following steps:

1. the spacing between two of left and right return yoke unshakable in one's determination, A phase iron core column, B phase iron core column and C phase iron core column is strengthened;

2. on A phase iron core column, B phase iron core column, C phase iron core column, be again wound around low pressure winding 5, be wrapped with high pressure winding in low pressure winding outside, high pressure winding outside is wound around pressure regulation winding;

3. change the upper yoke matching with A phase iron core column, B phase iron core column and C phase iron core column;

4. pressure regulation winding is made to tap, by on-load tap changer, by the pressure regulation tapping of different directions, the different numbers of turn and high pressure windings in series.

Advantage and beneficial effect that the present invention has are: transformer body of the present invention is to improve on the basis of existing transformer body, and the rear rated voltage ratio of improvement becomes 230 ± 8 × 1.25%/69 from 220 ± 2 × 2.5%/66 and adapted to the requirement that system voltage changes. the new transformer of having avoided purchasing on a barter basis.Can carry out the adjustment of no-load voltage ratio whenever and wherever possible, no longer need to have a power failure, use manpower and material resources sparingly, increase selling benefit, improve power supply reliability, there is good economic benefit.

Brief description of the drawings

Fig. 1 is 220kV off circuit tap changing transfor mer machine body structure schematic diagram;

Fig. 2 is the on-load tap-changing transformer machine body structure schematic diagram that utilizes this method transformation.

1. three-phase and five-pole iron cores in figure, 2. return yoke unshakable in one's determination, 3. upper yoke, 4. high pressure winding, 5. low pressure winding, 6.A phase iron core column, 7. B phase iron core column, 8. C phase iron core column, 9. window unshakable in one's determination, 10. pressure regulation winding.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described:

As shown in Figure 1,220kV off circuit tap changing transfor mer machine body structure is as follows: have the three-phase and five-pole iron core 1 being made up of two of left and right return yoke 2 unshakable in one's determination, upper yoke 3, A phase iron core column 6, B phase iron core column 7 and C phase iron core column 8, between two of left and right return yoke 2 unshakable in one's determination, upper yoke 3, A phase iron core column 6, B phase iron core column 7, C phase iron core column 8, form four windows 9 unshakable in one's determination, low pressure winding 5 is wrapped in respectively on A phase iron core column 6, B phase iron core column 7, C phase iron core column 8, and low pressure winding 5 is wrapped in the skin of high pressure winding 4.

A kind of method that transform 220kV off circuit tap changing transfor mer device body as on-load tap-changing transformer device body of the present invention comprises the following steps:

1. two of the left and right of three-phase and five-pole iron core return yoke 2 unshakable in one's determination, A phase iron core column 6, B phase iron core column 7 and C phase iron core column 8 are respectively reamed to a part, cut to remaining part can meet A phase iron core column 6, B phase iron core column 7 and C phase iron core column 8 in high-tension coil outer felt around pressure regulation winding, the spacing of left and right between two return yokes 2 unshakable in one's determination, A phase iron core column 6, B phase iron core column 7 and C phase iron core columns 8 strengthened.

2. on A phase iron core column 6, B phase iron core column 7, C phase iron core column 8, be again wound around low pressure winding 5, be wrapped with high pressure winding 4 in low pressure winding outside, be wound around pressure regulation winding 10 in high pressure winding outside.

3. change the upper yoke matching with A phase iron core column 6, B phase iron core column 7 and C phase iron core column 8.

4. pressure regulation winding 10 is made to tap, umber of turn difference between different taps, pass through on-load tap changer, pressure regulation winding 10 taps of different directions, the different numbers of turn are connected with high pressure winding 4, can realize the adjustment of transformer voltage ratio, meet the requirement that transformer output voltage is adjusted whenever and wherever possible.

As shown in Figure 2, improved on-load tap-changing transformer machine body structure is as follows: two of left and right return yoke 2 unshakable in one's determination, upper yoke 3, A phase iron core column 6, B phase iron core column 7, C phase iron core column 8 has formed three-phase and five-pole iron core 1 jointly, two return yokes 2 unshakable in one's determination in left and right, upper yoke 3, A phase iron core column 6, B phase iron core column 7, between C phase iron core column 8, form four windows 9 unshakable in one's determination, low pressure winding 5 is wrapped in respectively A phase iron core column 6, B phase iron core column 7, on C phase iron core column 8, high pressure winding 4 is wrapped in the outside of low pressure winding 5, pressure regulation winding 10 is wrapped in high pressure winding 4 outsides, on iron core column, form from inside to outside the distribution of low pressure winding 5-high pressure winding 4-pressure regulation winding 10.

Claims (1)

1. one kind transform 220kV off circuit tap changing transfor mer device body as the method for on-load tap-changing transformer device body, described 220kV off circuit tap changing transfor mer device body has three-phase and five-pole iron core, described three-phase and five-pole iron core is made up of two of left and right return yoke unshakable in one's determination, upper yoke, A phase iron core column, B phase iron core column and C phase iron core column, it is characterized in that the method comprises the following steps:

1. the spacing between two of left and right return yoke unshakable in one's determination, A phase iron core column, B phase iron core column and C phase iron core column is strengthened;

2. on A phase iron core column, B phase iron core column, C phase iron core column, be again wound around low pressure winding 5, be wrapped with high pressure winding in low pressure winding outside, high pressure winding outside is wound around pressure regulation winding;

3. change the upper yoke matching with A phase iron core column, B phase iron core column and C phase iron core column;

4. pressure regulation winding is made to tap, by on-load tap changer, by the pressure regulation tapping of different directions, the different numbers of turn and high pressure windings in series.