Integrated solution for partial discharge testing and withstand voltage testing implemented at Yifa Smart Factory, setting a new benchmark for high-voltage power testing of transformers and ring main units.
Release Date: July 17, 2026 Source: DEMIKS POWER Official News Center
I. Introduction
DEMIKS POWER (Shanghai DEMIKS Power Technology), a professional manufacturer of high-voltage testing instruments, and Jiangxi Yifa Electric Power Technology Co., Ltd. (stock code: 870154) , a national-level specialized and innovative “little giant” enterprise , officially reached a deep cooperation agreement. Yifa Electric Power has introduced a complete set of DEMIKS power frequency partial discharge-free partial discharge testing systems in batches , deploying them in the intelligent ring main unit digital workshop of its smart factory, which has been built with an investment of 300 million yuan. The systems comprehensively cover the factory partial discharge testing and withstand voltage testing of 220kV and below power transformers, environmentally friendly gas ring main units, prefabricated substations, and high-voltage switch-gear, constructing a full-process high-voltage power testing quality control system.
This powerful alliance between upstream and downstream companies, with high-precision partial discharge detection technology at its core, has streamlined the entire insulation quality control chain for new energy power transmission and distribution equipment, from R&D to production to delivery and type testing. It provides a replicable high-voltage power testing upgrade model for the transformer and complete switch-gear manufacturing industry.
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II. Strengths and Product Highlights of Both Partner Companies
(I) Jiangxi Yifa Power: A national-level specialized and innovative “little giant” enterprise, a benchmark for intelligent manufacturing across the entire power transmission and distribution industry chain.
Jiangxi Yifa Electric Power Technology Co., Ltd. is a core enterprise under Yifa Holding Group. It is a national high-tech enterprise and a Class A supplier of State Grid and China Southern Power Grid. It has been deeply involved in the field of power transmission and distribution equipment for more than ten years and has the capacity to produce 200,000 sets of intelligent power transmission and distribution equipment per year, with an annual output value of up to 1 billion yuan.
Our core product portfolio covers power transmission and distribution equipment across all voltage levels:
Transformer series (core business) : 220kV ultra-high voltage power transformers (maximum capacity 63000kVA), energy-saving on-load tap-changing transformers, amorphous alloy transformers, triangular three-dimensional wound core transformers, dry-type transformers, mining transformers. It is one of the manufacturers with the most complete range of transformer products in China.
Complete sets of switch–gear : environmentally friendly gas-insulated ring main units, intelligent high-voltage switch-gear, primary and secondary integrated ring main units, and prefabricated switch-gear;
New Energy Transformer Series : Photovoltaic substations, wind power substations, photovoltaic energy storage prefabricated modules, and photovoltaic grid-connected boxes, adapted to the construction needs of new energy power plants under the dual-carbon goals;
Power distribution supporting products : JP cabinets, low-voltage reactive power compensation devices, intelligent power metering boxes, high and low voltage components, etc.
Core Advantages: Yifa Power has invested 300 million yuan to build a smart factory and digital production line, increasing production capacity five fold and reducing product defect rate by 15%. It enjoys a high reputation in domestic and international markets for its 0.1 mm-level manufacturing precision. As a core supplier to the power grid, its transformers and ring main units must strictly meet national standards such as GB 1094 and GB 3906. Partial discharge testing and withstand voltage testing are mandatory core inspection items before leaving the factory. The existing testing system is insufficient to support the high-efficiency quality control requirements of intelligent mass production, necessitating the construction of a digital quality inspection laboratory using professional high-voltage power testing equipment.
(II) DEMIKS POWER: A leader in power frequency partial discharge detection technology
As a professional manufacturer of high-voltage testing instruments, DEMIKS POWER focuses on in-depth research and development of partial discharge detection and power frequency withstand voltage testing technologies. Its flagship product, the DJF series power frequency partial discharge-free detection system , is a core piece of equipment for detecting insulation defects in high-voltage equipment such as transformers, switch-gear, and GIS, with technical indicators reaching international advanced levels.
Core technological advantages of the power frequency partial discharge detection system:
Ultra-low background noise, industry-leading partial discharge test accuracy. Background partial discharge is ≤5pC under rated voltage, and as low as 0.5pC for high-end shielded models. The corona-free test transformer uses pure power frequency sine wave output with total harmonic distortion <1%, completely avoiding interference from the test power supply’s own discharge. It can accurately capture weak insulation defect signals at the pC level and fully complies with international and domestic standards IEC 60270, GB 7354, and GB 1094.3.
This integrated withstand voltage and partial discharge test system is compatible with a wide range of product testing systems. It combines power frequency withstand voltage testing and partial discharge detection, completing withstand voltage assessment and partial discharge measurement simultaneously with a single pressurization, covering the high-voltage power testing needs of all Yifa Power products.
- Transformers : Partial discharge testing of oil-immersed power transformers, dry-type transformers, and amorphous alloy transformers, detecting winding insulation, inter-turn defects, and bushing discharge;
- Complete switch–gear : withstand voltage testing and partial discharge testing of environmentally friendly gas ring main units, high-voltage switch-gear, and gas-filled switch-gear; checking for metal particles in gas chambers, air gaps in insulators, and burr discharge on busbars.
- Transformer type : Joint partial discharge test of the overall insulation system of photovoltaic transformer substations and wind power transformer substations;
- Components : Incoming material sampling inspection of core components such as current transformers, surge arresters, and bushings.
With its intelligent integrated design, it is suitable for batch quality inspection in digital factories. Equipped with a digital partial discharge acquisition host and touch operation terminal, it supports automatic voltage boost, real-time pulse spectrum display, automatic discharge quantity determination, and one-click generation of standardized test reports. It has built-in multiple safety interlocks for over-voltage, breakdown, and short circuit, which are suitable for the continuous batch testing needs of Yifa’s smart factory production line, greatly improving the efficiency of outgoing inspection.
We provide full-cycle technical services to support power grid bidding and type testing. The equipment comes with complete calibration certificates and test report templates in both Chinese and English, which can be directly used for the qualification review of State Grid and China Southern Power Grid bids, as well as for data verification by third-party type testing institutions, reducing external inspection costs and certification cycles for enterprises.
III. Core Contents of this Strategic Cooperation
1. Joint construction of a high-voltage power testing laboratory for smart factories
DEMIKS’s complete power frequency partial discharge detection system has been installed in Yifa Power’s intelligent ring main unit digital workshop, establishing an independent shielded high-voltage test chamber to achieve 100% factory partial discharge testing and withstand voltage testing of all transformers and ring main unit products , replacing the traditional single-point withstand voltage mode and building a complete insulation quality control system.
2. Establishment of a comprehensive partial discharge testing quality control system
The two parties jointly planned three high-voltage power testing checkpoints:
- Incoming material inspection : Conduct random inspections of partial discharge on core insulating components such as purchased instrument transformers, bushings, and circuit breakers upon arrival at the factory to control the overall discharge level of the machine from the source;
- Process inspection : Intermediate partial discharge tests are carried out in the middle section of the ring main unit assembly and after the transformer body is dried to identify assembly defects in advance and reduce rework of finished products;
- Final inspection before leaving the factory : The finished product undergoes power frequency withstand voltage testing and partial discharge testing simultaneously, and a complete test report is issued to ensure that the insulation performance of each piece of equipment leaving the factory is superior to the national standards.
3. Joint Technology R&D for New Energy Products
For special new energy products such as photovoltaic energy storage transformer substations and wind power transformer substations, the two parties share partial discharge test data. DEMIKS provides customized high-voltage power testing solutions, while Yifa Power optimizes the product insulation structure based on high-precision partial discharge data, jointly creating low partial discharge and high reliability new energy power distribution equipment.
4. Standardized testing system and talent training
The DEMIKS technical team provides Yifa Power with a full range of operational training, annual calibration and technical support, assists in establishing standardized partial discharge test operation manuals, cultivates a professional high-voltage power testing talent team, and supports the company in continuously expanding into high-end markets at home and abroad.
IV. Partial Discharge Detection System Empowers Yifa Electric’s Core Competitive Advantages
(i) Product quality has improved dramatically, widening the gap with the industry.
Its transformer partial discharge performance comprehensively superior to national standards, relying on the DEMIKS high-precision partial discharge testing system, Yifa Power’s transformers can stably control the partial discharge within 50% of the standard limit at the factory. It features “low partial discharge, long life, and low loss” as its main selling points, giving it a significant quality advantage in power grid centralized procurement and new energy projects.
Strengthening the core competitiveness of environmental protection ring main units: Gas-insulated ring main units are extremely sensitive to partial discharge, which is a key evaluation indicator in power grid primary and secondary integration bidding. Proprietary partial discharge detection capabilities can accurately control metal particles inside the gas chamber and discharge defects in the gas gap of insulating components, solving the industry pain point of insulation stability in environmental gas equipment and increasing the product’s market share in the high-end market.
(ii) Bonus points for core qualifications in power grid bidding
In the centralized procurement bidding process of State Grid and China Southern Power Grid, the ability to conduct partial discharge testing and withstand voltage testing, as well as a complete high-voltage testing laboratory, are core scoring items for quality control capabilities. As a Class A supplier, Yifa Power’s technical score significantly improved after equipping itself with DEMIKS professional high-voltage power testing equipment, enabling it to undertake higher voltage levels and larger-scale power grid centralized procurement projects.
(III) Intelligent manufacturing reduces costs and increases efficiency, and digital workshops are upgraded again.
The withstand voltage test and partial discharge test are completed in one step, reducing the testing time of a single product by 40%, which is suitable for the high-volume production line cycle of smart factories.
By intercepting insulation defects in advance, the rework rate of finished products is reduced by 30%, thus reducing the waste of raw materials and labor.
We can independently complete routine type testing projects, saving hundreds of thousands of yuan in third-party testing fees each year and shortening the new product launch cycle.
(iv) Enhanced ability to expand export markets
When exporting products to overseas markets such as Southeast Asia, the Middle East, and Africa, we can provide original partial discharge test data reports that comply with IEC standards, quickly pass the audits of overseas owners’ factories, break through international trade technical barriers, and help Yifa Power’s globalization layout.
V. Industry Implications: High-voltage power testing is an essential step in the intelligent upgrading of power transmission and distribution manufacturing.
This strategic cooperation between DEMIKS POWER and Jiangxi Yifa Power has established a mature model for upstream and downstream collaborative development, combining a ” high-voltage testing instrument manufacturer” with a “leading manufacturer of intelligent power transmission and distribution equipment ,” providing three important lessons for the power equipment industry:
Partial discharge testing is a watershed moment for the quality of high-end transformers and complete sets of equipment. With the upgrading of power grid equipment and the rapid development of new energy, withstand voltage testing alone can no longer meet the requirements of the high-end market. The independent equipment of power frequency partial discharge testing system is the core symbol of manufacturing enterprises moving from “mass manufacturing” to “quality intelligent manufacturing”.
High-voltage power testing is embedded into the entire production process before delivery, systematically reducing quality risks. Partial discharge testing is extended from single-point testing at the factory to the entire process of incoming materials, in-process, and finished products. This can control the insulation defect rate at the source, reduce after-sales failure rate and operation and maintenance costs, and is the only way for power transmission and distribution companies to achieve high-quality development.
Upstream and downstream technology collaboration enables deep integration between manufacturers of testing equipment for new power system construction and power transmission and distribution manufacturing enterprises. They jointly develop testing solutions for emerging scenarios such as new energy and ultra-high voltage, jointly promote the improvement of industry technical standards, and help build a safe and reliable new power system.
VI. Excerpts of viewpoints from both sides
The production manager of Jiangxi Yifa Power stated: “The insulation reliability of transformers and ring main units is the lifeline of our products, and partial discharge testing is the most crucial indicator for measuring insulation quality. After introducing the DEMIKS POWER power frequency partial discharge detection system, our high-voltage power testing capabilities have jumped to the forefront of the industry. Not only are our product partial discharge indicators consistently better than national standards, but it also supports the construction of a digital quality inspection system for our smart factory. In the future, we will continue to deepen our cooperation with DEMIKS POWER to jointly create higher-quality power transmission and distribution equipment.”
The Marketing Director of DEMIKS POWER stated: “Yifa Power is a benchmark enterprise for intelligent manufacturing upgrades in the power transmission and distribution industry. This collaboration represents a significant application of DEMIKS’ partial discharge testing technology in the transformer and ring main unit manufacturing field. We will continue to deepen our expertise in high-voltage power testing technology, providing more power transmission and distribution manufacturers with professional and reliable integrated solutions for partial discharge testing and withstand voltage testing, thus contributing to the quality upgrade of China’s power equipment.”
VII. HV Hi-pot Testing Company Recommendation
For more information on power frequency partial discharge detection system parameters, transformer partial discharge test solutions, ring main unit withstand voltage test configurations, and high-voltage power testing laboratory setup cases, please visit the DEMIKS POWER official website: https://demikspower.com to obtain complete technical data and industry application solutions for the DJF series partial discharge detectors.
