Shandong Qixing High Voltage Electric Co., Ltd., a leading manufacturer of dry-type RIP (Resin Impregnated Paper) and RIS (Resin Impregnated Synthetic) bushings, leverages its 550kV extra-high voltage (EHV) testing laboratory to continuously advance dry-type bushing technology for global power transmission, substation, and railway electrification projects.

The 550kV laboratory features a fully shielded hexahedral design that ensures a partial discharge (PD) background level below 3pC, meeting the most stringent international testing standards. This ultra-low PD environment enables highly accurate insulation performance measurements – critical for validating the long-term reliability of dry-type bushings under extreme electrical stress.

 Related: [RIP Transformer Bushings – Technical Overview] → /products/rip-bushing

Advanced Testing Capabilities for 10kV to 550kV Bushings

The laboratory is equipped with a comprehensive suite of high-voltage testing systems:

1,000kV power frequency withstand voltage test system – for AC dielectric strength verification.

2,400kV lightning impulse withstand voltage test system – simulating realworld lightning strike conditions.

600kV zero partial discharge, zeroloss high-voltage standard capacitor – enabling precise capacitance and dielectric loss (tan δ) measurements.

These systems allow the company to conduct full-scale type tests on bushings ranging from 10kV to 550kV and current ratings from 5A to 40,000A, covering all major product categories including oil  air, oil-SF, oil-oil, high current, GIS, and wall bushings. All testing procedures strictly follow IEC 60137-2017 and GB/T 41092022 standards.

Reference: IEC 60137 2017 – "Insulated bushings for alternating voltages above 1,000 V" → https://webstore.iec.ch/publication/

Shorter Product Validation Cycles, Faster Customer Response

Before the laboratory became operational, certain high voltage tests for 550kV class bushings had to be outsourced to external facilities, which often involved scheduling delays and extended lead times of several months. With in house testing capabilities, the company has reduced product validation cycles from months to weeks, enabling faster response to customer requirements for custom designed bushings.

Learn more: [Custom Bushing Design Services] → /custom-design

This accelerated validation timeline is particularly valuable for urgent infrastructure projects, such as highspeed railway electrification and substation upgrades, where component delivery schedules directly impact overall project completion. The company has already delivered over 4,900 bushings to railway projects, capturing 75% of China's highspeed rail bushing market.

Supporting the Global Energy Transition with Dry type Bushing Technology

As the global power transformer market faces structural supply constraints – with lead times for large power transformers extending up to five years in some regions – reliable, high-quality component suppliers play an increasingly critical role in keeping projects on schedule. Shandong Qixing’s in-house laboratory capabilities position the company to meet rising global demand for maintenance-free, explosion-proof, oil-free dry-type bushings, which are increasingly preferred for renewable energy step-up transformers, GIS substations, and rail infrastructure.

The company currently exports to more than 60 countries, with over 50,000 bushing units successfully installed worldwide. With ISO 9001, ISO 14001, ISO 45001, and CE certifications, Shandong Qixing continues to expand its international footprint while maintaining strict quality standards.

About Shandong Qixing High Voltage Electric Co., Ltd.

Founded in 2013, Shandong Qixing High Voltage Electric Co., Ltd. is a national high-tech enterprise specializing in the design, manufacturing, and testing of high-voltage bushings from 10kV to 550kV. The company's product portfolio includes RIP (Resin Impregnated Paper) and RIS (Resin Impregnated Synthetic) dry-type condenser bushings for transformers, GIS, and wall applications. With over 50,000 units delivered to 60+ countries, Qixing is a trusted supplier to leading transformer manufacturers including ABB, Siemens, TBEA, and the State Grid Corporation of China.