Online phase modulator of 0.4kV distribution network single-phase power supply load

Abstract

The invention provides an online phase modulator of 0.4kV distribution network single-phase power supply load. Due to the three-phase load imbalance, the phenomena that the line loss is high and the voltage is low are caused, and meanwhile, the phenomena that due to excess current, the aging of equipment is accelerated, and rusting and fire breakout at the position between the equipment and a wireare accelerated are caused, so that the power grid security is affected. Meanwhile, existing components for switching phase-to-phase voltage can generate large phase-to-phase current due to instantaneous phase switching, consequently, the components are prone to overburning, and the phenomena that electric equipment is damaged due to overvoltage can be even caused. The online phase modulator of the 0.4kV distribution network single-phase power supply load comprises a phase modulation selection controller, a switch controller, switching circuits, an auxiliary switch and a zero crossing detector. By means of the phase modulator, online phase modulation is achieved, the power supply phase sequence for the power supply load is down regulated under the condition that continuous electricity isensured, and phase switching is conducted through the two switching circuits. In the phase switching process, in order to avoid the influence of the phase-to-phase voltage and impulse current, a lightning-protection component is designed, the phase-to-phase voltage and the impulse current are directly grounded for release, and the potential equipment running danger is reduced.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to an online phase regulator for single-phase electric power supply load in a distribution network and an operation method thereof. Background technique [0002] The line loss index of 0.4kV distribution network is a key index affecting power grid marketing, and how to reduce line loss is the key to profitability. There are many reasons for high line loss, such as stealth leakage, equipment aging, inaccurate measurement, unbalanced low-voltage three-phase electrical load, etc. With the implementation of distribution network transformation and overhaul technical transformation projects over the years, the power grid has been greatly improved in terms of hardware equipment. However, the problem of unbalanced three-phase loads in the 0.4kV distribution network still commonly exists in the distribution transformer area, resulting in high line loss and "low voltage" phenomenon ...

AI Technical Summary

Problems solved by technology

However, the problem of unbalanced three-phase load in the 0.4kV distribution network still commonly exists in the distribution transformer area, resulting in high line loss, and the phenomenon of "low voltage" in severe cases

[0003] The unbalanced three-phase load will not only lead to high line loss and low voltage, but also cause accelerated aging of equipment due to overcurrent, accelerated rusting of equipment and wires, and fires, which will affect the safety of the power grid.

[0004] At the same time, the existing components that switch phase-to-phase voltage will generate a large phase-to-phase current due to instantaneous phase change, which is easy to burn components and even cause damage to electrical equipment due to excessive phase-to-phase voltage.

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