1. Benchmark Customer: China Energy Zhejiang Thermal Power

China Energy Zhejiang Thermal Power is a backbone enterprise in China’s energy construction sector, having undertaken numerous large-scale thermal power, nuclear power, power transmission & transformation, and new energy projects both domestically and internationally, known for its “standardized management and excellent quality”. The Indonesia PT.PTLG Power Station, invested by Indonesia’s SSP Group and EPC-contracted by China Energy Zhejiang Thermal Power, is located in South Sumatra Province. The project includes two 150MW circulating fluidized bed coal-fired power units, with a total construction period of 32 months. The project is of great significance for solving local coal transportation difficulties and improving power supply, and it is also one of China Energy Zhejiang Thermal Power’s key projects in the Southeast Asian market.

Due to Indonesia’s tropical rainforest climate, high humidity and large temperature differences pose severe challenges to the insulation performance of electrical equipment. The project department of China Energy Zhejiang Thermal Power implemented high-standard selection for all incoming test equipment and ultimately decided to choose Wuhan Kedi Zhongwei’s 800kVA/400kV VF series resonant withstand voltage test device.

2. Core Equipment: Wuhan Kedi Zhongwei 800kVA/400kV VF Series Resonant

This device is specially designed for high-voltage testing in large power plants. Its main technical parameters are as follows:

The device consists of four parts: a variable frequency power supply control box, an excitation transformer, high-voltage reactors, and a capacitive voltage divider. The reactors adopt multiple independent units that can be flexibly combined in series and parallel to meet the AC withstand voltage test requirements of different equipment such as main transformers, GIS, high-voltage cables, generators, busbars, and switchgear, significantly reducing the procurement and transport costs of multiple devices for overseas projects.

3. Technical Advantages: Why Was It Selected by China Energy Zhejiang Thermal Power?

1. Resonant voltage boosting – low power supply requirements on site
The required power supply capacity is only 1/Q of a conventional test transformer (Q ≥ 30). An ordinary three-phase 380V site power supply can drive an 800kVA level test, making it highly suitable for scenarios with limited power supply conditions on Indonesian construction sites.

2. Pure waveform – no damage to test object insulation
The resonant filtering effect makes the output voltage close to a standard sine wave, avoiding potential harmonic damage to expensive equipment such as main transformers and GIS.

3. Millisecond-level protection – safe and reliable testing
When flashover or breakdown occurs on the test object, the resonance condition is instantly destroyed, the voltage collapses, and the arc energy is extremely small. At the same time, the DSP digital circuit cuts off the output within milliseconds, ensuring the safety of equipment and personnel.

4. Field Application Results

During the commissioning phase of the Indonesia PT.PTLG Power Plant, Wuhan Kedi Zhongwei’s 800kVA/400kV VF series resonant successfully completed the following key tests:

• Main transformer AC withstand voltage test: 200kV test voltage applied to the 220kV main transformer for 60 minutes, with stable waveform and qualified data.

• 220kV GIS AC withstand voltage test: Completed full-enclosed GIS test at 395kV test voltage; the device protection was sensitive with no abnormal discharge.

• High-voltage power cable AC withstand voltage test: Using the resonant method, completed tests on multiple long-distance cables with a small power supply capacity, greatly improving on-site efficiency.

As of February 2025, all units of the PT.PTLG Power Plant successfully passed the 168-hour full-load test and NDC (Net Dependable Capacity) test, officially entering commercial operation. Wuhan Kedi Zhongwei’s series resonant device operated with “zero failure and zero misoperation” during the equipment handover test phase, earning high praise from the project department of China Energy Zhejiang Thermal Power.

5. Customer Testimonial

“Wuhan Kedi Zhongwei’s 800kVA/400kV VF series resonant device is easy to operate, with seamless switching between automatic and manual modes. The data storage function facilitates test report management. Under Indonesia’s high-temperature and high-humidity environment, the device performed stably with reliable protection. The lightweight single-unit design is very suitable for our overseas multi-island transportation and on-site handling. Overall, this is a set of high-voltage test equipment that gives the project department peace of mind and confidence.”

— Electrical Test Leader, PT.PTLG Project Department, China Energy Zhejiang Thermal Power

6. About Wuhan Kedi Zhongwei Electric Co., Ltd.

Wuhan Kedi Zhongwei Electric Co., Ltd. is a high-tech enterprise specializing in R&D, production, sales, and technical services of power preventive test equipment, high-voltage test instruments, and power automation systems. The company’s core product – the VF series resonant series – covers 50kVA～1080kVA with a maximum voltage level of 800kV. It also offers a full range of products including DC high voltage generators, loop resistance testers, relay protection testers, dielectric loss testers, and more. The products are widely used in power grids, power generation, railways, petrochemicals, metallurgy, new energy, and other fields, and are exported to Southeast Asia, the Middle East, Africa, South America, and other overseas markets.

The company adheres to the philosophy of “technology leadership, service first”, providing customers with full-cycle services from selection consulting and on-site training to after-sales maintenance. The successful cooperation with leading construction enterprises such as China Energy Zhejiang Thermal Power is the best proof of the company’s product quality.

Related Products Recommended:

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• Automatic Anti-Interference Dielectric Loss Tester

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Tags: #WuhanKediZhongwei #ChinaEnergyZhejiangThermalPower #VFSERIESRESONANT #800kVA400kV #IndonesiaPT.PTLG #HVWithstandTest #SeriesResonantManufacturer