PROJECT CASE
Guangda Electric Is A Professional Organization Dedicated To Solving Power Quality Problems Of Users
Case Study on the Renovation of Old Compensation Cabinets
Time：
2020-11-19
(Before Renovation) The current situation on site has 2 transformers with a rated capacity of 2500kVA, voltage levels of 10kV/0.4kV, and 2 reactive power compensation cabinets. The capacitors are severely leaking oil, and the switching devices frequently burn out. When the current reaches 2800A, the busbar vibrates abnormally. Based on on-site test data, it is determined that the harmonics exceed the standard, leading to failures in the original compensation cabinet. Solution (After Renovation) Based on engineering experience, the original compensation cabinet will be upgraded by replacing the pure capacitive reactive power compensation devices with intelligent filtering compensation modules and active filtering modules from Guida Electric. The provided TSVGGD device addresses the new power quality issues.
On-site Situation
There are currently 2 transformers with a rated capacity of 2500kVA, voltage levels of 10kV/0.4kV, including 2 reactive power compensation cabinets. The capacitors are severely leaking oil, the switching devices frequently burn out, and when the current reaches 2800A, the busbar vibrates abnormally. Based on on-site test data, it is determined that the harmonics exceed the standard, leading to failures in the original compensation cabinet.
Solution
Based on engineering experience, the original compensation cabinet was upgraded, replacing the pure capacitive reactive power compensation devices with intelligent filtering compensation modules and active filtering modules from Guangda Electric. The provided TSVGGD device is a new type of power electronic device that addresses power quality issues. This device includes an active power filter (APF) and intelligent filtering compensation modules, which use intelligent algorithms for control, providing comprehensive compensation capabilities for reactive power, three-phase load imbalance, and harmonics, demonstrating superior performance in compensating reactive power, three-phase imbalance, and harmonics.
Main Features of Intelligent Filtering Compensation Module
The module integrates a knife melting switch, thyristor, capacitor, reactor, and monitoring protection system into one product.
It uses a contactless zero-crossing trigger to control the circuit with thyristors, reducing inrush current when switching capacitor banks.
It employs a 7% series reactor to suppress inrush current and prevent harmonic resonance events.
The capacitors are rated at 480V, increasing their terminal voltage for stable and reliable operation.
Each module has independent protection measures: fan cooling, capacitor temperature, reactor temperature, thyristor temperature, overcurrent, overvoltage, and phase loss protection functions.
Each module has independent display and remote real-time monitoring data: capacitor temperature, reactor temperature, thyristor temperature, three-phase current values, and abnormal fault information.
Each module uses a metal shell with explosion-proof functionality.
Operating Effect
Power factor is 0.93 (before activation)
Power factor is 0.99 (after activation)
Harmonic voltage distortion rate is 7.8% (before activation)
Harmonic voltage distortion rate is 3.7% (after activation)
Effect Description
Voltage data: The total harmonic distortion rate of voltage decreased from 7.8% to 3.7% after the device was put into operation.
Power data: The displacement power factor increased from 0.93 to 0.99 after the device was put into operation.
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Guangdong Guangda Electric Co. Ltd.
Tel：18028173868
E-mail：gdgddq@126.com
Web：www.gd96.com
Add ：Building 3, No. 613, Xingtan Shuixiang Avenue, Gaozan Village, Xingtan Town, Shunde District, Foshan City, Guangdong Province