CN201066624Y - Self-excitation magnetic transformer - Google Patents

Abstract

The utility model relates to a self-excitation type transformer which is characterized in that at the secondary side of the transformer, the neutral point of a capacitor is connected with the neutral point of the transformer by switching a protection circuit breaker into a three-phase capacitor. The wire connection method of the three-phase capacitor adopts triangle connection method or star connection method. The utility model can make the transformer keep in an economic operation state when the transformer has no load, can improve the utilization rate of electric installation and can effectively reduce the loss of electrical energy.

Description

The self-excitation magnetic type transformer

Technical field

The utility model has related to a kind of transformer, has particularly related to a kind of self-excitation magnetic type transformer.

Background technology

Power factor is the characteristic quantity of part throttle characteristics of reflection electric power system, and its magnitude relationship is to the electrical characteristics of using of the power supplying efficiency of electric power system and power consumption equipment.Power factor is little to show that then reactive power is big, and reactive power can cause voltage fluctuation greatly in electric power system, and causes power loss increase in the power transmission line.The electric power factor of power transformer itself when transformer underloading or zero load, is in the non-economy running status generally less than 0.2 because of power rate is not up to standard.Simultaneously, electricity consumption department needs to pay the corresponding power rate electricity charge to power supply department.So improving power factor has great economic benefit.At present, the main method of improving the power factor of electricity consumption then has: the power factor and the user that improve power consumption equipment are provided with reactive power source, with flowing of reactive power in the change electric power system, thereby improve the voltage levvl of electric power system, reduce via net loss and the dynamic property of improving electric power system, but these methods all are to add circuit arrangement outside transformer, thereby have brought some troubles for the layout of electric power system.

Summary of the invention

The utility model has overcome deficiency of the prior art, and a kind of simple in structure, power back-off outstanding effect self-excitation magnetic type transformer is provided.

In order to address the above problem, the utility model by the following technical solutions:

A kind of self-excitation magnetic type transformer is characterized in that, at the secondary side of transformer, inserts three-phase capacitor by protective circuit breaker, and the neutral point of capacitor is connected with the neutral point of transformer.

The mode of connection of three-phase capacitor adopts triangle to connect or Y-connection.

The beneficial effects of the utility model are: the secondary side at transformer inserts three-phase capacitor, makes transformer itself have the power back-off function, has simplified the electric power system configuration.Adopt the utility model, make transformer when zero load, keep the economical operation state, improved the utilance of electric equipment, effectively reduced the loss of electric energy.

Description of drawings

Fig. 1 is the utility model electric capacity star-connected circuit figure

Fig. 2 is the utility model electric capacity delta-connected circuit figure

Among the figure: QF protective circuit breaker C capacitor

Embodiment

Embodiment one

A kind of self-excitation magnetic type transformer at the secondary side of transformer, inserts three-phase capacitor by protective circuit breaker, and capacitor is inserted Circuit Fault on Secondary Transformer by the Y-connection mode, and the neutral point of capacitor is connected with the neutral point of transformer.

The self-excitation principle:

When the secondary coil side is connected with load, induce the voltage powering load in the secondary coil, charge to capacitor simultaneously.

When secondary coil is unloaded, when being the no-load transformer operation, can regard the transformer belt capacitive load as, then secondary coil lateral capacitance current feedback is to transformer one lateral coil, 180 ° of the phasic differences mutually of its phase place and primary winding side exciting current, size be near exciting current, then approaches zero by the transformer magnetizing current after capacitor feedback electric current and the stack of former exciting current, be equivalent to transformer and no longer need power system excitation, be self-excitation.

Embodiment two

A kind of self-excitation magnetic type transformer at the secondary side of transformer, inserts three-phase capacitor by protective circuit breaker, capacitor is pressed the triangle connected mode insert Circuit Fault on Secondary Transformer, and the neutral point of capacitor is connected with the neutral point of transformer.

Its self-excitation principle and embodiment are together.

Claims (2)

1. a self-excitation magnetic type transformer is characterized in that, at the secondary side of transformer, inserts three-phase capacitor by protective circuit breaker, and the neutral point of capacitor is connected with the neutral point of transformer.

2. self-excitation magnetic type transformer according to claim 1 is characterized in that, the mode of connection of three-phase capacitor adopts triangle to connect or Y-connection.

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