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.
Second, 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 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
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