During thunderstorms, lightning-induced surges and switching overvoltages can easily penetrate equipment such as box-type substations and ring main units, damaging insulation and causing power outages—resulting in economic losses for industrial parks, new energy projects, and mining operations. As a core protective component, the surge arrester clamps overvoltages and dissipates surge energy, thereby safeguarding power distribution equipment.

Anhui Jinli Electric specializes in lightning and overvoltage protection, focusing on the R&D and manufacturing of lightning arresters and surge protective devices. Its product portfolio includes station-class, distribution-class, and line-class lightning arresters compatible with various types of switchgear assemblies; these products are widely used in urban distribution networks, photovoltaic and wind power systems, the chemical industry, and rail transit projects

Key Points for Surge Arrester Selection

Many engineers tend to confuse the nominal discharge current (In)—which is a parameter used for testing and verification—with the maximum lightning current withstand capability. The key to selection lies in ensuring proper insulation coordination between the surge arrester and the equipment:

1. Rated voltage (Ur) and continuous operating voltage (Uc): Selected based on system voltage and grounding method; for 10 kV non-effectively grounded systems, Ur = 17 kV and Uc = 13.6 kV are commonly used, while special operating conditions require on-site calculation.

2. Surge current capacity: 5 kA (8/20 μs) is the standard choice, while 10 kA is selected for critical circuits in areas with high lightning activity; increased surge current margins are required for new energy systems and overhead incoming lines.

3. Residual voltage: Insulation coordination factor ≥ 1.2–1.4; the lower the residual voltage, the higher the protection margin.

4. Creepage distance: In heavy pollution, coastal salt spray, and chemical environments, choose composite jacket arresters with increased creepage distance.

5. Qualification Standards: Compliant with GB 11032 (equivalent to IEC 60099-4); complete type test reports provided; meets requirements for tender acceptance.

Core Advantages

Composite rubber jacket; resistant to dirt and condensation; suitable for various harsh field environments.

High-performance valve discs, nanosecond-level response, low residual voltage, and effective suppression of various types of overvoltage.

Supports various mounting configurations—including suspended and cabinet-integrated options—and is compatible with complete equipment sets.

All qualification documentation is complete and meets the requirements for project bidding and acceptance.

Intelligent Online Monitoring

The aging and moisture ingress of traditional surge arresters cannot be detected by the naked eye, posing safety risks. Jinli Intelligent Monitoring Terminal:

· Real-time monitoring of leakage current, recording of lightning strike event data, and identification of equipment aging.

· LoRa wireless technology eliminates the need for cabling, facilitating the retrofitting of box-type substations and ring main units.

· Platform data analysis, automatic anomaly alerts, remaining useful life assessment, and implementation of condition-based maintenance.

From urban substations and industrial park distribution rooms to mountainous photovoltaic arrays, Gobi wind farms, and explosion-proof chemical plants, Jinli surge arresters are frequently paired with SPDs (Surge Protective Devices) to establish a tiered lightning protection system. This creates a comprehensive protection chain extending from cable entry points to secondary control systems, delivering an integrated "component-monitoring-platform" protection solution.

One-Stop Technical Services

Beyond hardware supply, Jinli Electric offers lightning protection system design, parameter verification, technical support for bidding, and on-site briefings to resolve complex project challenges regarding lightning protection.

While lightning strikes are unpredictable, protection measures can be implemented proactively. Anhui Jinli Electric safeguards medium- and low-voltage power distribution and ensures a stable power supply through reliable products and professional services.