PROJECT CASE
Guangda Electric Is A Professional Organization Dedicated To Solving Power Quality Problems Of Users
How to solve the heating issue of the mall's neutral line and transformer?
Time：
2019-09-05
In the small commodity market at the south gate of Zhuzhou City, two transformers are experiencing abnormal neutral line currents, leading to overheating of the neutral line cables and transformers, resulting in blackening or tripping phenomena, which pose a safety hazard for electricity usage. To address this issue, a set of low-voltage neutral line current absorbers (ZSFGD) is designed for the transformers and electrical locations on each floor, to filter out zero-sequence harmonics, absorb the current on the neutral line, improve power quality, and ensure electrical safety.
Customer Name: Hunan Zhuzhou Xingtong Industrial Co., Ltd.
Neutral line current absorberProject Background
Hunan Zhuzhou Xingtong Industrial Co., Ltd. is engaged in the sale, rental, and after-sales service of shops in the shoe city. The Zhuzhou South Gate Small Commodity Market has a total of 8 floors, each with various shops, mainly using electricity for lighting and air conditioning.
Electricity Overview (Shopping Mall Electricity)
The Zhuzhou South Gate Small Commodity Market currently has 2 transformers with a rated capacity of 2000kVA. The two transformers operate in parallel, mainly supplying electricity to the shops on 8 floors, with electrical equipment including air conditioning, lighting, elevators, etc. Under the current load, the transformer neutral line current is 900A, and the neutral line current of a single transformer is about 400A.Abnormal Neutral Line CurrentCausing the neutral line cable to heat up, transformers to overheat, resulting in blackening or tripping phenomena, posing electrical safety hazards.
Neutral Line Current Absorber Design Plan
A set of low-voltage neutral line current absorber ZSFGD is designed for the transformers of the Zhuzhou South Gate Small Commodity Market and the electrical positions on each floor, to filter out zero-sequence harmonics, absorb current on the neutral line, improve power quality, and ensure electrical safety.
Neutral line current absorberEffect Analysis
After the operation of the low-voltage neutral line current absorber ZSFGD, the neutral line current of a single transformer decreased from 399A to 86A, and the absolute value of the third harmonic current distortion decreased from 154A to 40A, solving the user's power quality issues.
Neutral line current absorberOperating Data
Before installation, the neutral line current of a single transformer is about 399A.
After installation, the neutral line current of a single transformer is about 85A.
Before installation, the third harmonic current distortion value is about 154A.
After installation, the third harmonic current distortion value is about 39A.
Improving energy efficiency and enhancing power quality is what Guangda has always been committed to providing as an optimization solution for power systems. We have a professional team that can provide customized solutions based on the specific needs of customers, bringing more stable and high-quality power support to customers' production and operations. If you have related issues, please feel free to contact us.
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