The induction withstand voltage test for transformers and current transformers is an important test to verify whether the product meets national standards. The longitudinal insulation induction test of the inter-layer, inter-turn, segment, and phase insulation of the winding is an important item to assess whether the winding meets the requirements. To increase the test voltage of the winding while preventing the transformer or current transformer core from becoming overly saturated, which would lead to excessive excitation current, the test frequency needs to be increased, generally ranging from 100Hz to 400Hz.

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- Commodity name: ZSBP-10kVA400V three-phase frequency induction withstand voltage test device
The induction withstand voltage test for transformers and current transformers is an important test to verify whether the product meets national standards. The longitudinal insulation induction test of the inter-layer, inter-turn, segment, and phase insulation of the winding is an important item to assess whether the winding meets the requirements. To increase the test voltage of the winding while preventing the transformer or current transformer core from becoming overly saturated, which would lead to excessive excitation current, the test frequency needs to be increased, generally ranging from 100Hz to 400Hz.

Product Overview

This product is designed to meet the requirements of <<GB1094.3—85>>, <<GB1207>>, and the <<Electrical Equipment Preventive Testing Regulations>> - 1995 for threefold frequency induction withstand voltage tests and partial discharge tests.

Induction withstand voltage tests for transformers and current transformers are an important test to verify whether the product meets national standards. The longitudinal insulation induction test of the winding's inter-layer, inter-turn, segment, and phase insulation is a crucial item to assess whether the winding meets the requirements. To increase the test voltage of the winding and prevent the transformer or current transformer core from becoming overly saturated, leading to excessive excitation current, the test frequency needs to be increased, generally to 100Hz - 400Hz.

There are various methods to obtain a 100Hz - 400Hz power supply, among which the more applicable ones are: ① a combination of three variable frequency generators (100Hz - 400Hz); ② a combination of three single-phase transformers (150Hz), with the second method being the most convenient.

The combination of three single-phase transformers: the primary side is connected in a star configuration, and the secondary side is connected in an open delta. When the core is not saturated, the main magnetic flux it generates must be a flat-top wave. Since the flat-top wave of the main magnetic flux contains a significant component of third harmonic magnetic energy Φ3, the frequency of the third harmonic magnetic flux f₃=3f₁, thus the main magnetic flux induces a third harmonic phase voltage.

Due to the primary side being connected in a star configuration and the secondary side in an open delta configuration, the core operates in a saturated state, and the no-load current I presents a peaked wave, which, in addition to the fundamental wave, also contains higher-order harmonics. The amplitude of the higher-order harmonics I is relatively large, and due to the open delta on the secondary side, the three-phase fundamental wave components cancel each other out, leaving only the third harmonic output.

The overall voltage output is achieved by tuning the 150Hz power supply to produce resonance. When the voltage increases, a certain screeching sound during resonance is a normal phenomenon.

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Wuhan Zhongke Xinyi Electric Power Technology Co., Ltd.

Brand: ZECERS/Zhongke Xinyi

Wuhan Zhongke Xinyi Electric Power Technology Co., Ltd. (brand: ZECERS/Zhongke Xinyi) is a high-tech enterprise focusing on the design, development, manufacturing and technical services of high-voltage test equipment and secondary test equipment for power systems.

The company is located in the Optics Valley New District of the High-tech Development Zone, with 5600 square meters of modern standard production plants and perfect manufacturing, processing and testing equipment. The company has a strong research and development, solid technology, excellent quality team, and Wuhan universities have close ties and technical cooperation, laying a solid foundation for technological innovation. The company has successively obtained ISO9001:2015 international quality management system certification and high-tech enterprise certification. Based on domestic power system testing, the company explores high-tech cutting-edge information technology, and is committed to the research of various new power technologies and the formulation and promotion of relevant standardization.

The company adheres to the business philosophy of "quality-oriented, pioneering and innovative, honest and pragmatic, and win-win cooperation", regards product quality and independent innovation as the core competitiveness of the enterprise, and continuously strives for the standardization, humanization, intelligence, refinement and diversification of products. The products cover all aspects of power testing, and widely serve the State Grid, South Grid, Inner Mongolia Power Grid and other power systems, major power generation groups, photovoltaic wind power new energy enterprises, railway petrochemical enterprises, metallurgical industrial and mining enterprises, electrical complete sets of enterprises, transmission, transformation and distribution engineering construction units, scientific research institutions, third-party testing institutions and other enterprises and institutions. The power testing equipment produced by the company provides a reliable data basis for the safe operation of the power system. The company's products have covered all provinces and cities in the country, and have been exported to Laos, Myanmar, Cambodia, Vietnam, Pakistan, East Africa, Russia, Malaysia, Brazil, Europe and other countries, and have been widely recognized.

"Technology to create the future, innovation to change the present", would like our professional to provide you with satisfactory products and services and create more value.

2014 Year

Company establishment

3060 Wan yuan

Registered capital

5600 ㎡

Production plant

8372 +

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