1. Heavy Industry
Project Overview
Kaiphosphorus Fertilizer is one of the first batch of pilot enterprises for circular economy in China, and the factory has basically achieved automated production. It is a typical enterprise that implements modern technology production and processing.
The factory has invested a large amount of frequency converters and air compressor equipment. During the operation of the frequency converters, a large number of harmonics are generated, which can cause equipment heating, increased mechanical vibration noise, sudden shutdown of the frequency converter, resonance, and other problems.
This renovation has carried out harmonic control on six transformers in the old fluorine salt distribution room, sulfuric acid A distribution room, sulfuric acid B distribution room, and 240000 ton distribution room.

Picture of Kaiping Fertilizer Factory
The old fluorine salt distribution room adopts wall mounted active filtering modules, the sulfuric acid B distribution room adopts a full cabinet supply plan, and the other distribution rooms use drawer type filtering modules.
2 harmonic control scheme
Selection of sampling points and governance points
Sampling point: Active filtering requires collecting the current of all loads, and cannot collect the current of this cabinet or compensation cabinet.
Governance point: The governance point of active filtering should be placed after the compensation cabinet and before the load cabinet.

System diagram of on-site governance plan
This renovation project provides open sampling current transformers for on-site construction convenience. In addition, the current transformer cannot be opened, and our company has provided dedicated current terminals and terminal blocks for the renovated distribution room to facilitate later maintenance.
3 Project Progress
Governance effectiveness and user feedback
After the on-site renovation was completed, our company used a Fuluke power quality analyzer for analysis and comparison before and after the renovation. After the renovation, the voltage and current harmonic distortion rates in the on-site distribution room met the requirements of national standards.

Data Sheet of Electric Energy Quality after Transformation
During the epidemic, engineers were quarantined and controlled on site for a week. They overcame the inconvenience of food and transportation, actively communicated with customers, and ultimately fulfilled their mission to complete this renovation project.
This renovation has addressed odd harmonics on site, helped customers improve the overall power quality of the factory, and solved problems such as capacitor failures and equipment heating caused by harmonics. Instant service and a spirit of fearlessness have also won unanimous praise from customers.
Ultimate service, infinite progress.