Electric equipment used for production of steel cord will produce a large quantity of harmonic current and thus, generate harmonic voltage via system impedance. This may make harmonics at PCC (point of common coupling) exceed the limit seriously and give rise to pollution of public network; moreover, it will cause three-phase imbalance of line, cable heating, speed up the insulation aging of line and even lead to fire disaster. In addition, copper & iron losses of the transformer will be increased, transformer will be overheated and its actual output will be decreased. Voltage behind capacitor of the compensation device will be increased and current passing through the capacitor will be bigger, so that the capacitor will have the power loss increased and appear abnormal heating. Under the effects of electric field and temperature, aging of insulating medium will be accelerated. Under serious harmonics, capacitor will suffer circumstances like bulging, breakdown or blasting and thus give rise to serious safety accident; moreover, additional loss of motor will be increased, efficiency will be decreased and even, motor overheating may appear. In particular, negative-sequence harmonic will produce negative-sequence rotating magnetic field in motor and generate torque in the opposite direction of motor rotation, with braking action, thus, motor output will be decreased and rotor overheating may appear. In addition, it may give rise to overheating of switches and even incorrect tripping; and it may also possibly lead to incorrect tripping of relay protection and produce a great number of inconveniences for stable operation of the production line. Harmonic current will give rise to certain voltage ripple on the busbar. The degradation of voltage quality would affect the power quality, and as a result, some measuring equipment would provide incorrect output or display, compromising safety and stability of equipment operation.

Background information

Jiangsu XXX Steel Cord Co., Ltd owns the largest production base of steel cord in China and has always engaged in resource-saving, low-carbon, environment-friendly and emission-reduction projects. Nowadays, the Company has more than 7,000 employees and its products include steel cord, bead wire, rubber tube wire and saw wire etc., with the market share of 27% in China and up to 18% in the world. By strictly following the principle of scientific development and highlighting technology, equipment and management innovation, the Company has, based on the national-recognized technology center, national-recognized laboratory, postdoctoral research center, Key Laboratory for Structural & Functional Metal Composites in Jiangsu Province and Technical Research Center for Special Alloy Works in Jiangsu Province, successfully developed more than 100 kinds of new-structure steel cord in four categories. Various performance indexes of our products rank first in the same industry. On the premise of keeping our domestic market advantages, the Company has also participated in international competition actively and implemented its brand strategy. The Company has established good cooperation with various world-famous tire corporations, applied for trademark registration in 74 countries or regions, and has supplied products and rendered technical service for over 200 customers from more than 30 countries and regions. At the end of 2017, the Company has been granted with 262 patents, including 52 patents for invention. National standard of steel cord has been established under the direction of the Company. Production Technology for High-Performance New-Structure Steel Cord Special for Radial Tires developed by the Company independently has won the National Prize for Progress in Science and Technology (Second Class). The Company has won numerous honorary titles including National Hi-Tech Enterprise, National Torch Plan Key Hi-Tech Enterprise, National Dominant Enterprise for Intellectual Property and International Famous Brand Supported and Developed in Jiangsu Province etc.

Solution

CEAYEA Electrical &Technology (Shanghai) Co., Ltd. has offered the integrated solution for harmonic control and reactive power compensation of plating line to Shandong Plant of Jiangsu XXX Steel Cord Co., Ltd.

Operation effect

Harmonic control and reactive power compensation device supplied by CEAYEA can help the user:

1. Solve the problem of power-factor-adjusted charges Avoid fines for power-factor-adjusted charges and lower down the cost of production electricity for the user.

2. Lower down line loss: Electric energy loss arising from long line, high harmonic and great reactive demand; save electricity.

3. Release capacity of main transformer: Lower down the capacity of main transformer occupied by reactive power; improve the power supply capacity of transformer and extend the service life of transformer.

4. Conquer the hazard of harmonics: Lower down the temperature rise of transformer, mitigate skin effects of equipment line, decrease failure rate of sensitive elements and make production and operation become more stable.

Summary

Series CY-DL harmonic control and reactive power compensation device supplied by CEAYEA can not only satisfy the requirements for reactive power compensation of power distribution system, but also filter 5th, 7th and 11th characteristic harmonics of plating line, with the absorption rate above 65%. Thus, it can increase the efficiency of power supply, improve power quality and assure the safe and stable operation of equipment.