2026 Top 8 CT Tester Suppliers in China

2026-07-23

Introduction to CT Tester

CT testers are crucial professional instruments in the electrical power industry, dedicated to detecting and verifying the performance of current transformers in power systems. They support core test items including ratio testing, polarity testing, excitation curve testing, winding resistance testing and insulation resistance testing. By calibrating the accuracy and stability of CT equipment, these testers effectively avoid power measurement deviations and relay protection faults, ensuring the safe, stable and efficient operation of power transmission and distribution networks. With the rapid development of China’s smart grid and global power engineering construction, high-precision, intelligent and cost-effective CT testers from Chinese manufacturers have gained increasing global popularity. This article brings the top 8 reliable CT tester suppliers in China for your reference.

Top 8 CT Tester Suppliers in China

1. Kvtester Electronics Technology Co., Ltd.

Founded in 2008, Kvtester Electronics Technology Co., Ltd. is a professional national high-tech enterprise focusing on the R&D, production and global sales of power testing equipment. With independent brand intellectual property rights, the company has served more than 40 countries and regions worldwide, delivering over 30,000 sets of testing equipment, and enjoys a high reputation in the global CT tester manufacturing field.

Features in CT Tester

The core model CTA-1000D CT tester of Kvtester achieves the same high measurement accuracy level as OMICRON CT analyzers, supporting ultra-precision ratio and phase error detection. It integrates multi-functional testing modules covering CT ratio, polarity, excitation characteristic and secondary resistance testing, realizes one-click automatic testing to reduce manual errors. Equipped with a portable lightweight body and complete data transmission interfaces, it adapts to various on-site and laboratory testing scenarios, and supports customized functional development according to customer demands.

Advantages of the Company

The company has passed ISO9001, ISO14000 and ISO45001 triple system certification, with standardized production and strict quality control. It has a professional R&D team with long-term industry experience, capable of rapid product iteration and market demand response. It provides 7*24-hour remote technical support, global after-sales service and on-site technical guidance, with stable delivery capacity and excellent cost performance, becoming the preferred supplier for medium and small power enterprises and global engineering projects.

2. Hioki E.E. Corporation (China Branch)

Hioki E.E. Corporation is an international enterprise specializing in the research and production of electrical measurement and testing instruments. Its China branch undertakes the localized sales and technical service of the brand’s testing equipment, covering CT tester products for power generation, power transmission and power distribution scenarios.

Features in CT Tester

Hioki’s CT testers adopt high-speed measurement technology to complete full-parameter detection of current transformers and shorten on-site testing cycles. The products are equipped with matched data analysis software to support data sorting, result analysis and test report output. Most models adopt integrated portable structure and built-in power supply, which is adaptable to field operation environments without fixed power sources.

Advantages of the Company

The company maintains long-term technical iteration and product upgrading in the field of electrical testing. It has a complete CT tester product matrix to meet the testing demands of different voltage levels and application scenarios. Relying on global unified production standards and service systems, it provides standardized equipment and technical services for the Chinese market.

3. Megger Group Limited (China Office)

Megger Group Limited is an enterprise focusing on the manufacturing of electrical testing and measuring equipment. Its China office is responsible for the market promotion, equipment supply and after-sales service of the brand’s CT testing instruments in China’s power industry.

Features in CT Tester

Megger’s CT testers adopt industrial-grade structural design and wear-resistant materials, which can adapt to complex environmental conditions such as high temperature, humidity and dust. The equipment features stable measurement performance and can maintain consistent test data under fluctuating electrical environments. Partial products are equipped with remote control functions to support remote testing operation.

Advantages of the Company

The enterprise has accumulated rich technical experience in the field of electrical testing equipment. Its products comply with mainstream international industry standards and specifications. It relies on a global service network to provide technical support, equipment maintenance and after-sales response for Chinese regional users.

4. Wuhan Huatian Electric Automation Co., Ltd.

Wuhan Huatian Electric Automation Co., Ltd. is a domestic high-tech enterprise engaged in the research and development, production and sales of electrical testing and monitoring equipment, with a complete product system for power detection instruments.

Features in CT Tester

Huatian’s CT testers support automated testing workflows, which can automatically complete data acquisition, parameter analysis and curve generation to reduce manual operation intervention. The equipment supports docking with other electrical testing devices to form a combined testing system. Some models are provided with real-time parameter monitoring functions to track the operating status of CT equipment.

Advantages of the Company

The company focuses on the technical research and product optimization of power testing equipment, and has a rich product line to support multi-scenario testing requirements of power enterprises. It provides standardized equipment and matching technical services, and has stable market application cases in China’s domestic power industry.

5. Shanghai Sefram Electric Co., Ltd.

Shanghai Sefram Electric Co., Ltd. is a professional manufacturer of electrical testing instruments, mainly developing and producing high-performance testing equipment suitable for smart power system scenarios.

Features in CT Tester

Sefram’s CT testers are applicable to the testing of conventional and multi-tap special CT equipment, with stable measurement accuracy. The products are equipped with Ethernet, USB and other communication interfaces to realize data transmission and remote equipment control. The integrated design integrates multiple testing functions to simplify on-site instrument configuration.

Advantages of the Company

The company has independent technical research and development capabilities for testing equipment, and implements standardized production and quality inspection processes. It has practical experience in equipment application in power engineering scenarios, and can provide targeted testing solutions according to user demands.

6. Beijing Huadian Kexin Electric Co., Ltd.

Beijing Huadian Kexin Electric Co., Ltd. is a domestic enterprise focusing on the R&D and production of high-voltage electrical testing equipment, with a professional technical team and nationwide sales and service layout.

Features in CT Tester

The company’s CT testers adopt high-precision testing chips to meet the calibration requirements of high-precision metering and protective CTs. The built-in intelligent control module can automatically match testing ranges and analyze test data. The equipment is equipped with multiple safety protection mechanisms to reduce operational risks during testing.

Advantages of the Company

The enterprise has sustained R&D investment in high-voltage testing equipment, and can develop targeted products for high-voltage power system scenarios. Relying on a nationwide sales network, it realizes regional product supply and distribution, and provides daily technical support and fault handling services for users.

7. Xi’an XD High Voltage Apparatus Research Institute Co., Ltd.

Xi’an XD High Voltage Apparatus Research Institute Co., Ltd. is a professional research and production institution in the field of high-voltage electrical equipment, focusing on the technical research and equipment development of high-voltage power testing.

Features in CT Tester

The CT testers developed by the institute are oriented to high-voltage and ultra-high voltage power system scenarios, supporting performance testing of EHV and UHV CT equipment. The products are based on professional high-voltage testing technology, with accurate and standardized test data, meeting the type test specifications of professional power inspection institutions.

Advantages of the Company

The institute relies on professional high-voltage electrical research achievements to carry out product development, with prominent technical characteristics in the high-voltage testing field. It has industry research and application influence, and carries out long-term industry cooperation and technical research and development iteration.

8. Nanjing Guodian NARI Technology Co., Ltd.

Nanjing Guodian NARI Technology Co., Ltd. is a technological enterprise focusing on power system automation and electrical testing technology, engaged in the R&D and manufacturing of intelligent power testing equipment.

Features in CT Tester

NARI’s CT testers support data interconnection with power system automation platforms to realize real-time data sharing. The equipment is equipped with big data analysis functions, which can sort out and analyze historical test data. It supports remote equipment monitoring and fault diagnosis to realize remote unattended testing.

Advantages of the Company

The company has long-term technical accumulation in smart grid construction and power system operation, and its products are in line with domestic power industry technical standards. It has large-scale production capacity to meet centralized batch supply demands, and its products are widely applied in domestic power plants, new energy stations and urban power distribution networks.

Conclusion

The suppliers listed in this article cover international brands and domestic manufacturing enterprises in China’s CT tester industry, with different technical characteristics and market positioning. International brands such as Hioki and Megger have accumulated mature testing technology and global market application experience. Domestic manufacturers including Kvtester have formed differentiated competitiveness in testing accuracy, customized service and cost control.

Driven by the upgrading of smart grid construction and the development of global power engineering, the market demand for high-precision and intelligent CT testing equipment continues to rise. Major suppliers continue to carry out technical research and product optimization to adapt to the updated testing standards of the power industry. Purchasers can select suitable CT tester suppliers in China according to actual testing scenarios, accuracy requirements and budget conditions.