Zigzag connection load balance transformer

Abstract

The invention discloses a zigzag connection load balance transformer which comprises an iron core, a primary side winding and a secondary side winding. The primary side winding comprises three-phase windings AN, BN and CN, star connection is adopted, a neutral point N of the primary side winding is allowed to be grounded. In the secondary side winding, a phase A winding is composed of ao, fo and be, a phase B winding is composed of bo, do and cf, and a phase C winding is composed of co, eo and ad. The secondary side winding forms a triangular winding. When ao with the same winding direction as the primary side winding is a main winding, ad and do which are in zigzag antiphase connection are additional windings; when bo is a main winding, ad and eb are additional windings; and when co is a main winding, of and fc are additional windings. The zigzag connection load balance transformer has special load current transfer characteristics, current distribution of the primary side can be improved under the conditions that a secondary side loads of a power distribution network are asymmetric, a three-phase current tends to be balanced, transformer and electric transmission line loss is reduced, the capacity utilization rate of the transformer is improved, and the electric energy loss of a line is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a meander connection load balancing transformer. Background technique [0002] Non-linear and asymmetrical loads such as rectifier equipment, electric arc furnaces and electrified railways in the industrial distribution network lead to heating and vibration of the motors and transformers in the system, causing relay protection malfunctions, and also greatly increasing line losses, seriously exceeding the power supply System line loss assessment index, resulting in a huge waste of electric energy. [0003] At present, problems such as reactive power, three-phase unbalance, and negative sequence are mainly treated by means of load planning and balanced compensation devices. In response to these problems, existing grid reconfiguration and reactive power optimization technologies are used to achieve three-phase balance and reduce line loss. In recent years, compens...

AI Technical Summary

Problems solved by technology

[0005] Based on the advantages of the crankshaft connection transformer, the crankshaft connection transformer in the existing technology does not have special load current transfer characteristics, and cannot improve the current distribution on the primary side under the condition of asymmetric load on the secondary side of the distribution network, and cannot make the three-phase The current tends to be balanced, so the loss of transformers and transmission lines cannot be reduced, and the capacity utilization of transformers cannot be improved

However, the transformer wiring is complex and the impedance relationship is not easy to realize. It cannot be applied to large-scale industrial distribution networks with more asymmetric loads, and cannot effectively reduce line power loss. Therefore, it is necessary to improve it.

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