Asynchronous motor local reactive power compensation
Xu Shuang
Ankerui Electric Co., Ltd., Shanghai Jiading 201801
I. Introduction
The electric motor is a large number of electrical equipment in factory enterprises, and it is also the main inductive electrical equipment in the low-voltage network. When the motor is working, the reactive power loss caused by the electromagnetic conversion accounts for more than 70% of the reactive power loss in the low voltage power supply. In order to reduce the reactive power loss and improve the power factor of the motor, the state has issued mandatory national standards for the economic operation of three-phase asynchronous motors. Enterprises should rationally configure reactive power compensation devices so that the power factor can reach more than 90%. Reasonable implementation of reactive power compensation device. The company can obtain obvious economic benefits.
Second, the effectiveness of reactive power compensation
1. Save energy and reduce electricity expenses. For example, a company uses a 315KVA distribution transformer. The integrated power factor of the enterprise is 0.8. The power rate adjustment tariff should be increased by 2.5%; if it is increased to more than 0.96, the electricity tariff should be reduced by 1.1%. Obviously, after the increase in power density, the electricity bill will be reduced by about 3.6%.
2. Improve the load capacity of the power supply equipment and save the power supply fee. Still taking the 315KVA transformer as an example, in the case of a power factor of 0.8, only 252 KW of active load can be taken. With the expansion of production planning. Transformer capacity is becoming less and less. If 40KW of new equipment is put into production, a 50KVA distribution transformer must be added, and its power supply up to 20,000 yuan, plus equipment purchase costs, installation fees, etc., and corporate investment will reach 40,000-50,000. yuan. If you can configure ARCORE's ARC power factor controller (with self-healing capacitor capacity of 20KVAR), the power factor can be increased to more than 0.92, the original transformer can have a work load of 290KW, basically to meet the needs of new equipment. The installation cost of reactive power compensation equipment is less than 10,000 yuan. Can save companies a lot of money.
3, reduce line pressure drop, improve power quality and extend the life of electrical appliances. With the ARC power factor controller, the motor power distribution line current can generally be reduced by 10-20%, and the voltage at the device terminal can be increased by about 5%, which has significant benefits for the improvement of the service life of the electrical appliances and the improvement of product quality.
Third, the choice of ARC power factor controller
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 specific motor compensation requirements and load characteristics. 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
Note: Impact Loads: Welders, Cranes, High Power Motors, Rolling Mills, etc.
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
√
Fourth, the results of practice
Practice has proved that the use of ARC power factor controller is not only a new energy-saving, high-efficiency and easy-to-implement technology, but also can increase the power factor of enterprises, reduce the reactive current of distribution lines, reduce losses, and improve the quality of power supply. Improve the efficiency of the motor and the output of the power supply equipment. It should be promoted and implemented as soon as possible in factory enterprises.
References: Ankerui Electric Co., Ltd. Product Selection Manual 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
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