Recently, Shanghai DEMIKS POWER’s complete set of independently developed high-voltage electrical testing equipment successfully completed on-site installation, system commissioning, and final project acceptance. It has officially entered the UHV comprehensive testing hall of a branch of the China Electric Power Research Institute, and is now fully engaged in cutting-edge scientific research and verification work on UHV transmission and transformation equipment. The delivered equipment matrix includes three core categories: a megavolt-level lightning impulse voltage generation system 은 large-capacity power frequency withstand voltage testing system, and a high-voltage testing system , establishing a one-stop integrated scientific research and testing platform for high-voltage insulation impulse withstand voltage testing. This in-depth cooperation signifies that DEMIKS’s domestically produced high-end power testing equipment has gained full recognition from the highest-level research institutions in the domestic power industry in terms of testing accuracy, continuous operation stability under extreme conditions, and customized adaptation capabilities for scientific research scenarios. Domestically developed high-end electrical testing equipment is now officially serving the nation’s cutting-edge technology research on UHV and new power systems.
I. Introduction to China Electric Power Research Institute — China’s leading testing base for ultra-high voltage equipment
The China Electric Power Research Institute (CEPRI) is a top-tier national-level comprehensive power research institution directly under the State Grid Corporation of China. It undertakes core national functions such as tackling key technologies for the national power grid, drafting industry standards, type approval of power equipment, and power grid safety assessment . The CEPRI branch supplied by DEMIKS POWER is its core and distinctive testing base, and also a benchmark R&D and verification platform in the fields of ultra-high voltage, high voltage switch-gear, GIS, large-capacity transformers, and SF₆ environmentally friendly electrical equipment in China.
The branch institute has multiple Class 10,000 clean-room ultra-high voltage professional testing halls, possessing full type testing qualifications for electrical equipment across all voltage levels (AC 1000kV and DC ±1100kV). It is the only official and authoritative verification platform for the State Grid and China Southern Power Grid’s new high-voltage transmission and transformation products to enter the grid. The vast majority of core power grid equipment nationwide, such as high-voltage disconnect switches, GIS switchgear, power transformers, and complete switch-gear, must undergo a full set of stringent performance certifications here before being put into the market or connected to the grid.
The branch’s core research directions cover cutting-edge topics such as insulation withstand performance of ultra-high voltage transmission and transformation equipment, thermal stability characteristics of high current carrying capacity, SF₆ gas circulation low-carbon and environmentally friendly technology, insulation withstand characteristics of lightning/operating impulses, and R&D and verification of SF₆-free environmentally friendly switchgear. It also leads the development and revision of national standards for the power industry and IEC international standards, serving as a core “benchmark laboratory” for technological innovation in domestic power transmission and distribution equipment. Due to its undertaking of national-level research tasks, the branch has set the highest industry entry standards for its testing equipment, including measurement accuracy, automation control level, over 72 hours of full-load extreme operation capability, and full-process traceability of test data. This bulk purchase of DEMIKS complete sets of equipment, after multiple rounds of technical bench-marking, extreme condition trial operation, and multi-dimensional test data comparison and review, represents an official and authoritative certification from a national-level research platform of the comprehensive technical strength of domestically produced power testing equipment.
II. The Value of the Delivered DEMIKS Core Equipment and its Scientific Applications
newly installed UHV test hall are precisely matched to the three sub-segments of scientific research and testing scenarios of the research institute, providing comprehensive support for the research and verification of new materials, new structures, and new processes for UHV equipment:
Comparative research and development tests of switch-gear.
( I ) Megavolt-level lightning impulse voltage generation system
The complete set of equipment consists of a vertical red impulse generator, spherical equalizing shielding electrodes, and a matching control and acquisition system. It can accurately output standard lightning impulse and operating impulse voltage wave-forms, which are used to assess the lightning insulation withstand capability of high-voltage core equipment such as GIS, bushings, current/voltage transformers, and power transformers. It realistically reproduces the extreme working conditions of lightning striking the power grid in nature, and provides core test data support for the optimization of ultra-high voltage insulation structure and the tackling of new insulation material performance. The waveform control accuracy and equalizing shielding structure performance of the equipment have reached the first-class high-end level in China.
( ii ) Large-capacity high-voltage power frequency withstand voltage test device
The complete set of equipment consists of a dry-type high-voltage 시험 변압기, an intelligent fully automatic control console, a high-voltage divider, and a filter compensation component. It can stably output a continuously adjustable large-capacity power frequency high-voltage test waveform, used to assess the power frequency AC insulation withstand performance of high-voltage switch-gear, GIS cavity, power bushings, transformer windings, and insulating auxiliary materials. It simulates the long-term power frequency energized operation over-voltage conditions of power equipment, providing standardized test conditions for insulation coordination design of ultra-high voltage equipment, aging characteristics research of solid insulation materials, and 부분 방전 synergistic withstand voltage test. The equipment’s output voltage stability, waveform distortion control, and load withstand performance reach the top domestic industry standards.
( III ) High-voltage power integrated detection system
The entire system consists of a multi-channel signal acquisition host, a multi-functional high-voltage sensing terminal, integrated data analysis software, and external expansion interface modules. It integrates multi-dimensional synchronous detection functions for loop resistance, DC resistance, dielectric loss parameters, insulation resistance, and high-voltage switch mechanical characteristics. It is used for closed-loop verification and performance benchmarking analysis of all electrical parameters of high-voltage switches, transformers, and GIS complete sets of equipment. It realizes data interconnection and interoperability of multiple types of test equipment and unified collection and traceability of test data across the entire domain. It provides integrated data support for various high-voltage electrical research projects of the research institute, national standard data calibration, and cross-verification of test results. The system’s compatibility and research-grade data accuracy are among the industry’s leading levels.
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III. Introduction to the Overall Strength of Shanghai DEMIKS POWER
Shanghai DEMIKS POWER has been deeply involved in the R&D, manufacturing, and customized solutions of high-voltage electrical testing equipment for more than ten years. It is one of the few domestic professional manufacturers that can independently develop and deliver a full range of electrical testing equipment, including temperature rise and current rise systems, SF₆ gas handling equipment, impulse withstand voltage testing devices, power frequency withstand voltage, and partial discharge detection equipment.
The company possesses proprietary intellectual property rights for high-power closed-loop constant current boosting algorithms, multi-channel precision temperature measurement technology, and core patents for precise control of high-voltage impulse waveforms. Its products cover the power testing needs of all voltage levels from 10kV to 1100kV. Its domestic customers include thousands of high-voltage complete set manufacturers, transformer manufacturers, and authoritative third-party testing institutes. It also has the capability to adapt to CE and IEC international standards, and its equipment is exported in batches to overseas power transmission and distribution manufacturing bases in Southeast Asia, the Middle East, and Latin America.
Unlike ordinary equipment manufacturers in the industry, DEMIKS can provide customized complete testing solutions for national-level scientific research platforms and large-scale ultra-high voltage test halls. These solutions fully meet the special needs of long-term continuous operation under extreme conditions, multi-device control, and long-term archiving and traceability of scientific research data. The entire software and hardware process is independently controllable, effectively breaking the industry’s long-standing reliance on imports for high-end power testing equipment. This in-depth equipment cooperation with the Wuhan Branch of the China Electric Power Research Institute marks a significant milestone in the company’s leapfrog development in domestic technology.
IV. Summary of Cooperation and Future Outlook
The successful delivery of this complete set of high-end testing equipment to the branch of the China Electric Power Research Institute is a testament to the high recognition of Shanghai DEMIKS’s product quality, continuous technological innovation capabilities, and customized service capabilities by a national-level authoritative scientific research platform. From the mass production and quality inspection lines of the listed electrical giant Changgao Group to the authoritative scientific research laboratories undertaking national ultra-high voltage technology research, DEMIKS’s complete sets of high-voltage testing equipment continue to earn the trust and endorsement of industry benchmark customers.
In the future, Shanghai Demiks Electric Power Technology company will continue to focus on the core track of ultra-high voltage and new environmentally friendly power equipment testing, increase investment in the research and development of underlying core technologies for testing equipment, and continue to provide more intelligent, efficient and stable domestic high-voltage electrical testing solutions for major domestic power research institutes and leading power transmission and distribution manufacturers. With independently controllable core testing equipment, it will safeguard the safe operation of the national power grid equipment and help my country’s new power system and ultra-high voltage power transmission and distribution industry achieve high-quality innovative development.
