10kv Intelligent Energy Balance Distribution Transformer

Abstract

A 10kv intelligent energy balance distribution transformer comprises a casing, a three-limb core and a three-phase winding, wherein the three-phase winding is divided into a primary winding and a secondary winding, three input ends of the primary winding are respectively connected with an A-phase, a B-phase and a C-phase on the high-voltage side, four output ends of the secondary winding are respectively an a phase, a b phase, a c phase and an o line, and an on-load tap changing switch is installed on the casing. The primary winding comprises multiple sub-windings which are respectively wound on different core limbs, each sub-winding is provided with a plurality of taps, and the taps of the sub-windings are connected through the on-load tap changing switch. The secondary winding also comprises a plurality of sub-windings which are also respectively wound on the different core limbs, the number of turns of the primary winding is changed through a tap changing switch K, and the effect of balancing three-phase electric energy is achieved through electromagnetic interactions and phase reversal superposition of the windings. The 10kv intelligent energy balance distribution transformer can dynamically adjust the three-phase electric energy and reduce null line current.

Description

technical field [0001] The invention relates to a transformer, in particular to a 10kv intelligent energy balance power distribution transformer. Background technique [0002] As we all know, under normal symmetrical operation conditions, the three-phase voltage and three-phase current maintain a symmetrical state. However, the load of the three-phase system users is often asymmetrical, and unbalanced operation is a common operating state. For example, electric locomotives in electrified railways and power frequency electric furnaces in metallurgical industries are typical single-phase loads, and their currents can reach hundreds of amps or even thousands of amps. The impact of negative sequence current and zero sequence current is quite serious. The non-simultaneity of single-phase load input in residential quarters, large office buildings, and shopping malls, as well as the lack of construction, renovation and operation and maintenance of low-voltage distribution networks...

AI Technical Summary

Problems solved by technology

The non-simultaneity of single-phase load input in residential quarters, large office buildings, and shopping malls, and the lack of construction, renovation and operation and maintenance of low-voltage distribution networks have led to unbalanced distribution of three-phase loads in low-voltage distribution networks.

The existence of negative sequence current has a series of adverse effects on transmission lines and electrical equipment, including the transformer itself, such as reducing the utilization rate of power equipment, causing additional heat and vibration of the generator rotor, and endangering electrical equipment, especially induction motors. The safe operation of the system reduces the power factor, increases line loss and voltage drop, interferes with and affects the correct action of relay protection and automatic devices, etc.

The existence of zero-sequence current causes zero-sequence main magnetic flux to be generated in the transformer core, and then zero-sequence potential is generated, which causes the center point of the potential triangle to move, resulting in voltage imbalance

Cause neutral line overload, resulting in loss of neutral line heat and then a fire

However, there is currently no transformer that can solve the above technical problems; therefore, designing a 10kv intelligent energy balance distribution transformer that can dynamically adjust the three-phase power and reduce the neutral current is a technical problem that needs to be solved at present

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