Automatic phase modulator for low-voltage three-phase load unbalance

Abstract

An automatic phase modulator for low-voltage three-phase load unbalance of the invention comprises a control circuit and a phase switching mechanism. The control circuit comprises a three-phase rectifier bridge composed of D1, D2 and D3, a voltage dividing circuit composed of R1, R2, R3, R4, R5 and R6, a voltage comparator composed of IC1, IC2 and IC3, a set comparison voltage circuit composed of D5 M2 and R8, and a delay trigger circuit composed of IC3, M1 and R8. A phase switcher K is responsible for the selection of three-phase voltage. The automatic phase modulator for low-voltage three-phase load unbalance of the invention has the beneficial effect that the automatic phase modulator is simple in structure, low in cost and reliable in performance, and can achieve the technical means of automatic three-phase voltage adjustment, improve the quality of power supply of low-voltage transmission lines and ensure normal electricity use of users.

Description

(1) Technical field [0001] The invention belongs to low-voltage transmission line power supply equipment of a power supply system, in particular to a low-voltage three-phase load unbalanced automatic phase adjuster. (2) Background technology [0002] The low-voltage power supply lines of my country's power supply system are all three-phase four-wire power supply methods, which are prone to unbalanced power supply loads and single-phase overweight, which reduces the quality of power supply. If the voltage of the overweight phase line is too low, it is easy to blow out, affecting normal use. At the same time, unnecessary power loss is increased, which affects the efficiency of the power supply system. In recent years, the State Grid has carried out technical transformation on some low-voltage power supply line networks to solve the problems of small wire diameter and small power distribution capacity. It is still common to manually adjust the three-phase load balance. Due to t...

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Problems solved by technology

[0002] The low-voltage power supply lines of my country's power supply system are all three-phase four-wire power supply methods, which are prone to unbalanced power supply loads and single-phase overweight, which reduces the quality of power supply. If the voltage of the overweight phase line is too low, it is easy to blow out, affecting normal use. At the same time, unnecessary power loss is increased, which affects the efficiency of the power supply system

In recent years, the State Grid has carried out technical transformation on some low-voltage power supply line networks to solve the problems of small wire diameter and small power distribution capacity. It is still common to manually adjust the three-phase load balance. Due to the unsustainable power consumption of household appliances and other factors, the effect is not ideal, and the highest efficiency of the transmission line cannot be achieved.

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