Relay protection and high-voltage test site

Project positioning: Build a leading integrated platform for relay protection testing and high-voltage testing in China, meet the full life cycle testing needs of 500kV and above ultra-high voltage equipment, and support the reliability verification of new power system equipment.

Core technical solutions

1. Relay protection test system

• Fully digital simulation test platform:

• Based on RTDS (real-time digital simulation system), an AC/DC hybrid power grid model is built to simulate complex fault scenarios (such as high-resistance grounding and subsynchronous oscillation).

• Supports compatibility testing of protection devices from multiple manufacturers (NARI, Sifang, ABB), with an action time error of ≤0.5ms.

• Intelligent closed-loop test:

• Integrated AI algorithm automatically generates test cases, covering protection logic, fixed value verification and fault recording analysis, and improves test efficiency by 50%.

2.  Construction of high-voltage test station

• UHV test capability:

• 1100kV power frequency withstand voltage test system: output capacity 5000kVA, partial discharge ≤5pC (background noise control ≤2pC).

• ±800kV DC withstand voltage and partial discharge test device, suitable for converter transformers, DC wall bushings and other equipment.

• Environmental simulation test:

• High altitude test chamber: simulates an extreme environment of 5,500 meters above sea level and a temperature of -40℃~+50℃ to verify the insulation performance of the equipment.

• Salt spray corrosion test system: evaluates the corrosion resistance level of GIS equipment shell in coastal areas (in accordance with IEC 60068-2-52 standard).

3. Digital management platform

• Test data center:

• Integrate LIMS (Laboratory Information Management System) to achieve automatic generation of test reports and equipment health status rating (A/B/C/D four categories).

• Remote collaboration system:

• Supports video review by equipment manufacturers and power grid companies, live broadcast of the entire test process and data sharing.

Project implementation highlights

1. Localization breakthrough:

• High-voltage test equipment (impulse voltage generator, voltage divider) has achieved 100% domestic production to replace imports, reducing costs by 40%.

• Independently develop relay protection test software to break the technology monopoly of foreign manufacturers.

2. Green test technology:

• A 1.2MW photovoltaic + energy storage system is installed on the roof of the test station to meet 30% of the electricity demand in the station and reduce CO₂ emissions by 800 tons per year.

• SF6 gas recovery and purification device (recovery rate ≥ 99.9%), to eliminate greenhouse gas emissions during the test process.

3. Extreme conditions verification capability:

• Successfully completed the 5500m altitude simulation test of the world's first ±800kV flexible DC converter valve, providing data support for the Qinghai-Tibet Plateau project.

• The local discharge positioning accuracy of GIS equipment is ≤0.5 meters, and the false alarm rate is<1 time/1,000 times.

Project Results and Customer Value

• 1. Industry Certification:

• Obtained laboratory certification from CNAS (China National Accreditation Service for Conformity Assessment), and the test reports are globally recognized.

• Became the "UHV Equipment Grid Access Detection Designated Platform" of the National Energy Administration.

• 2. Economic benefits:

• The annual testing capacity covers 200 sets of UHV equipment, shortening the equipment commissioning cycle by 30%, and saving customers more than 200 million yuan in operation and maintenance costs.

• 3. Social benefits:

• Promote the export of domestic UHV equipment to Southeast Asia and South American markets, and the international acceptance rate of test reports exceeds 90%.