1、 Background introduction

　In recent years, with the continuous deepening of urban and rural distribution network transformation, the demand for electricity consumption has been increasing. The normal operation of various power equipment requires the power supply system to have good stability and efficient power supply capacity. However, in the power supply process of the power system, due to the fact that most of the electrical equipment belongs to inductive load devices, the overall power consumption of the power grid operation is reducedThis increases the reactive power of the current, causing a significant loss of electrical energy. At the same time, it also affects the normal operation of the equipment, accelerating its wear and tear. To reduce the negative impact of reactive power, using JP compensation cabinets for power compensation in the power grid is an effective solution. JP compensation cabinet is a common equipment for compensating power, and its core device is low-voltage capacitor. The application of JP compensation cabinet improves the overall operating efficiency of the power grid.

2、 There are problems

　　traditionalJP compensation cabinets mostly adopt the scheme of "miniature circuit breaker+capacitor switching switch+low-voltage capacitor". The capacitor branches are generally set to 1-6, and the branch switching is coordinated and controlled by an external compensation controller. In practical applications, traditional capacitor switching switches are prone to generating inrush currents during switching, which can have an impact on capacitors and the power grid, leading to a decrease in the lifespan of capacitors and easy damage. At the same time, due to the use of a large number of discrete components in the capacitor compensation part, the JP compensation cabinet has a large volume, complex wiring, and difficult debugging; Moreover, due to the special installation method and location, it is difficult to identify the cause of the malfunction and replace damaged components.

3、 Reactive power compensation design

Regarding the transformer capacity of a supporting residential area in Shandong Province, inThe design capacity configuration of JP compensation cabinet is as follows:

3.1 Product Introduction

The SFR-L series low-voltage power capacitor module is a new generation of reactive power compensation product designed for 0.4KV low-voltage distribution systems, achieving high efficiency, energy saving, reducing line loss, improving power factor and power quality. This series of products is mainly used in situations where harmonic pollution is not severe.

This product mainly consists of an intelligent measurement and control unit, a thyristor composite switch circuit, a high breaking capacity miniature circuit breaker, and twoThe △ type self-healing power capacitor or a Y-shaped self-healing power capacitor and communication module are integrated through reasonable structural design to replace the traditional reactive power compensation method of power capacitors.

Technical Specifications

3.2 Design Diagram

4、 Project Summary

　　The SFR-L series low-voltage intelligent capacitors have replaced the reactive power compensation devices originally composed of controllers, fuses, AC contactors, low-voltage capacitors, etc., changing the bulky and cumbersome structural mode of traditional reactive power compensation devices. As a result, the new generation of low-voltage intelligent reactive power compensation devices have better compensation effects, lower power consumption, smaller size, more cost savings, more flexible use, more convenient maintenance, longer service life, and higher reliability, adapting to the higher requirements of modern power grids for reactive power compensation.

This series of products has been used in multiple box type power distribution systems in Shandong Province, with reliable operation and good compensation effects, achieving the expected goals and improving the overall operational efficiency of the power grid, and receiving praise from users.