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Balancing transformer based on reverse-A wiring and power supply method thereof

A technology for balancing transformers and power supply methods, applied in transformers, fixed transformers, transformers/inductor coils/windings/connections, etc., can solve the problems of increasing negative sequence current and asymmetry of the power grid, and achieve the effect of saving step-down transformers

Pending Publication Date: 2019-02-15
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also single-phase or three-phase transformers used to reduce 27.5kV to 10.5kV or 0.4kV three-phase voltage, but it is asymmetrical operation, which increases the negative sequence current of the grid

Method used

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  • Balancing transformer based on reverse-A wiring and power supply method thereof
  • Balancing transformer based on reverse-A wiring and power supply method thereof
  • Balancing transformer based on reverse-A wiring and power supply method thereof

Examples

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Effect test

Embodiment 1

[0058] Embodiment 1: as Figure 1~4 A new inverted A type three-phase to two-phase and three-phase to three-phase balance transformer. Including iron core, primary side winding and secondary side winding, the iron core is three-phase column type or three-phase shell type;

[0059] The primary side winding is composed of three-phase windings AN, BN, CN, and adopts star connection;

[0060] In the secondary side winding, phase A is composed of winding dc, the midpoint is e, and phase B is composed of winding fd and db. Phase C consists of windings ac and cf.

[0061] The windings dc, cf and fd form a closed triangle, forming the path of the third harmonic current;

[0062] The primary side A, B and C form a three-phase system, and the neutral point N is allowed to be grounded;

[0063] Secondary sides a, e and e, b constitute a two-phase system, and point e is the common point of the two-phase system. At the same time, d, c, f constitute a three-phase system, which can prov...

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PUM

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Abstract

The invention discloses a balancing transformer based on reverse-A wiring and a power supply method thereof. The balancing transformer comprises an iron core, a primary-side winding and a secondary-side winding; the primary-side winding is composed of three-phase windings AN, BN and CN, and adopts star-shape wiring, and N is a neutral point; a three-phase system is formed by a primary-side A, a primary-side B and a primary-side C; in the secondary-side winding, an A phase is a winding dc, the midpoint of the A phase is e, and a B phase is composed of a winding fd and a winding db; a C phase iscomposed of a winding ac and a winding cf; a closed triangle is formed by the winding dc, the winding cf and the winding fd, and an access of third harmonic current is formed; a two-phase system is formed by secondary sides a and e and secondary sides e and b, and the e point is a common point of the two-phase system; meanwhile, a three-phase system is formed by d, c and f, a three-phase supply can be provided externally, and the two-phase system and the three-phase system can simultaneously or separated supply power externally. The balancing transformer based on reverse-A wiring is compact in structure and flexible in using, and unbalance of power supplying can be effectively avoided.

Description

technical field [0001] The invention belongs to the field of power transformers, and relates to a balance transformer based on an inverted-A connection and a power supply method thereof. Background technique [0002] The traditional transmission and distribution system is a three-phase system. However, many users need two-phase or single-phase power supply, which will inevitably cause asymmetric operation of the three-phase system, resulting in large negative sequence current and zero sequence current components. Decrease the quality of power grid power supply and affect the normal power supply of other users. In electrified railway traction network, two-phase power supply is used, and its asymmetrical operation is particularly serious. For 110KV and above three-phase power grids, the high-voltage side of the transformer generally adopts the neutral point grounding operation mode to reduce the voltage insulation level of the transformer. This requires that the neutral poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F30/12H01F27/28H02J3/26
CPCH02J3/26H01F27/28H01F30/12Y02E40/50
Inventor 许志伟许智萌谢卫才刘志华彭晓
Owner HUNAN INSTITUTE OF ENGINEERING
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