Xu Shuang Ankerui Electric Co., Ltd., Shanghai Jiading 201801 I. Introduction The power supply system of a metallurgical workshop in Jiangyin is 10kV, one of which is a 10/0.4kV transformer with a capacity of 800kV•A. The load rate of the transformer is about 65%. The main load is the AC motor (inductive load). The power factor is around 0.5. In order to increase the power factor and reduce unnecessary electricity expenses, Ankerui's low-voltage reactive power compensator was selected. Through the use of the low-voltage reactive power compensator, the energy-saving effect is very good and the electricity expenses are reduced. Ancorui's ARC power factor controller strictly complies with the requirements specified in professional standards such as DL/T597 "Low-Voltage Reactive Power Compensation Controller Ordering Specifications" and JB/T9663 "Low-Voltage Reactive Power Automatic Compensation Controller" and other professional standards. According to the demand and load characteristics of the low voltage distribution network. In general, the controller can be selected from the following aspects: Table 1 Product Application model Load requirements Compensation method Switch Capacitor Compensation plan ARC-6/J ARC-8/J ARC-10/J ARC-12/J Three-phase balanced load; and the reactive power is relatively stable, and users who do not need frequent switching of capacitance compensation are required. Single-load (high-power motor) on-site compensation and low-voltage switchgear centralized compensation Contactor Self-healing power capacitor Three-phase total compensation ARC-6/R ARC-8/R ARC-10/R ARC-12/R Three-phase balanced load, or variable load, impact load. Single-load (high-power motor) on-site compensation and low-voltage switchgear centralized compensation Capacitive non-contact switching switch Self-healing power capacitor Three-phase total compensation ARC-12F-J ARC-16F-J Three-phase balanced load; and the reactive power is relatively stable, and users who do not need frequent switching of capacitance compensation are required. Single-load (high-power motor) on-site compensation and low-voltage switchgear centralized compensation Contactor Self-healing capacitor Three-phase total compensation, sub-supplement ARC-12F-R ARC-16F-R Three-phase balanced load, or three-phase unbalanced load, variable load, impact load. Single-load (high-power motor) on-site compensation and low-voltage switchgear centralized compensation Capacitive non-contact switching switch Self-healing power capacitor Three-phase total compensation, sub-supplement Table 2 Product Selection Product number Function selection table Static output Dynamic output Overvoltage Undervoltage Overcurrent Under current Temperature protection Phase protection Harmonic protection communication Encoding ARC-6/J √ √ √ √ √ √ ARC-6/R √ ARC-8/J √ √ √ √ √ √ ARC-8/R √ ARC-10/J √ √ √ √ √ √ ARC-10R √ ARC-12/J √ √ √ √ √ √ ARC-12/R √ ARC-12F-J √ √ √ √ √ can selected √ √ Optional √ ARC-12F-R √ ARC-16F-J √ √ √ √ √ can selected √ √ Optional √ ARC-16F-R √ Third, the choice of reactive power compensation capacity When the reactive power compensation capacity is mainly for the purpose of increasing the power factor, the choice of compensation capacity is divided into two major categories, namely, the selection of single-load local compensation capacity (mainly motor) and the selection of multi-load compensation capacity (referring to centralized and local grouping). make up) . 3.1 Selection of Local Load Compensation Capacity for Single Load (1) US data recommendation: Q c = ( 1/3) P e (1/3 of rated capacity) (2) Empirical coefficient method: Since the number of motor poles is different, the capacitor with a capacity closer to the actual need is determined by determining the empirical coefficient of the number of poles. When this method is generally used at 70% load, the post-compensation power factor may be 0.95 to 0.97. between. Table 3 Empirical coefficient method 3.2 Selection of Multiple Load Compensation Capacity The selection of multi-load compensation capacity is determined based on the power factor before and after compensation. Reactive power compensation capacity Qc is as follows: Fourth, the effectiveness of reactive power compensation Ankerui's controllers installed reactive power compensation devices on the side of the low-voltage line distribution cabinet of Jiangyin Metallurgical Co., Ltd. From the results of post-installation tests, the average current is reduced by 40 (A). The motor power factor is from The increase of 0.5 to 0.95 has reduced the consumption of the company's internal low-voltage power grid. The monthly electricity bill has been reduced from 12,000 yuan/month to 8,000 yuan/month, achieving the purpose of saving electricity. Due to the reduced input of reactive power in the grid, the metallurgical company benefits. references: [1] Ankerui Electric Co., Ltd. Product Selection Guide 2013.1. About the Author: Xu Shuang, female, undergraduate, Ankerui Electric Co., Ltd., the main research direction is reactive power compensation and active filter device design; Email: Mobile QQ PVC Self-Repair High Speed Zipper Door
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Second, the choice of ARC power factor controller 
