Non-gapped line arresters (NGLA) provide overvoltage protection for overhead transmission lines by eliminating spark gaps and connecting directly to the line. These surge protection devices safeguard against lightning strikes and switching impulses, enhancing power grid security and line availability through continuous operation.
The arresters feature a silicone housing with internal metal-oxide varistors (MOV) as active elements. Under normal system voltages, the MOVs act as insulators; during overvoltage events, they become conductive and limit surge voltages to levels below the insulator withstand voltage. This material composition ensures durability and consistent performance across various climatic conditions and installation scenarios.
Key benefits include high energy absorption capacity with discharge capabilities of 3.6 coulombs and thermal energy absorption measured in kilojoules per kilovolt. An integrated automatic disconnector galvanically isolates the arrester during thermal overload or fault conditions, allowing continued line operation until replacement. This design reduces outages and lowers life cycle costs while supporting system voltages up to 800 kV.
Applications encompass transmission lines with poor grounding resistance, high lightning activity regions, and lines requiring enhanced availability. Mounting flexibility allows attachment directly to insulators or tower structures using standard tools. Compliance with IEC 60099-4 ensures the arresters meet international performance and safety criteria, with optional wireless monitoring systems available for tracking leakage currents and surge events.
Non-Gapped Line Arrester Manufacturer
RaxPower, established in 2003 and based in Hebei Province, China, is a leading manufacturer of pole line hardware with over 21 years of expertise in R&D, production, and global supply. Our extensive facilities include 17,000 square meters of production workshops and 5,000 square meters of warehouses, supported by a skilled team of over 170 employees, including 30 professional technicians and 10 engineers.
We specialize in advanced manufacturing processes such as hot forging, which delivers superior strength and precise sizing for critical components like the Non-Gapped Line Arrester. Rigorous quality control is integral to our operations, from raw material selection to multi-stage testing, ensuring every product meets high standards.
Automation and semi-automatic molds enhance production efficiency and consistency, while our hot-dip galvanizing technology adheres to ISO 1461, providing smooth, durable coatings. Load and gauge tests, compliant with IEC 120, verify performance and reliability.
Guided by our philosophy that “quality is life, reputation is base,” RaxPower guarantees that each Non-Gapped Line Arrester offers exceptional durability and safety, making us a dependable partner for power infrastructure projects worldwide.
| Technical Parameter | Unit | Value for Size 1 | Value for Size 2 |
|---|---|---|---|
| Highest System Voltage (Us) | kV | 170 | 800 |
| Rated Voltage (Ur) | kV | 144 | 360 |
| Nominal Discharge Current (In) at 8/20 µs | kA | 10 | 20 |
| Thermal Energy Absorption Capability | kJ per kV of Ur | 4.5 | 9.2 |
| Line Discharge Class | – | 2 | 4 |
| Charge Transfer (Qrs) | C | 3.6 | 3.6 |
| High Current Withstand Strength (4/10 µs) | kA | 100 | 100 |
| Low Current Withstand Strength (2 ms) | A | 500 | 1500 |
| Short Circuit / Pressure Relief Capability (0.2s) | kA | 40 | 63 |
| Mechanical Strength (Specific short-term load) | Nm | 1200 | 4000 |
Frequently Asked Questions (FAQS)
What is a non-gapped line arrester and how does it work?
RaxPower's non-gapped line arresters use metal oxide varistors (MOVs) that function as insulators under normal voltage conditions. During overvoltages, the MOVs become conductive, diverting surge currents to ground and limiting voltages below the insulator withstand voltage. They offer high mounting flexibility, allowing installation directly on insulators or towers depending on the design and line arrangement.
What protection and benefits do non-gapped line arresters provide?
RaxPower's non-gapped line arresters protect against overvoltages from lightning strikes and switching impulse currents. Benefits include superior protection through high energy absorption capacity, an automatic disconnector for fault isolation, and compliance with IEC 60099-4 standards, ensuring reliable surge protection for power lines up to 800 kV.
Where should non-gapped line arresters be installed?
RaxPower recommends installing non-gapped line arresters at strategic locations along the transmission line, particularly in areas with poor grounding resistances, high lightning activity, or where line availability needs improvement, based on engineering simulations.
How is safety ensured in case of arrester failure?
An integrated disconnector automatically isolates RaxPower's non-gapped line arrester from the line voltage in the event of a fault or thermal overload, allowing continued operation of the overhead line until replacement can be scheduled.
Can RaxPower provide customized solutions and technical analysis?
Yes, RaxPower offers customizable mechanical and electrical designs to meet unique project requirements. We provide software-based line simulation analysis to determine optimal arrester placement, considering factors like tower configuration, lightning activity, and insulation levels. Optional advanced monitoring systems allow for real-time condition assessment, supporting proactive maintenance and grid stability.
How do RaxPower's arresters reduce lifecycle costs?
RaxPower's arresters minimize lifecycle costs through high energy efficiency, reduced maintenance needs, and long service life. By preventing outages and equipment damage, they reduce operational disruptions and repair expenses. Durable materials, compliance with standards, competitive pricing, and bulk order options provide additional savings for utilities and project developers focused on long-term value.
What manufacturing and delivery capabilities support large-scale projects?
With over 21 years of experience and a 17,000-square-meter production facility, RaxPower utilizes automated processes and strict quality control for efficient, high-volume manufacturing. Robust installation hardware and standardized tools enable quick deployment, minimizing outage times. Optimized logistics ensure on-time delivery, making us a reliable partner for EPC contractors and major infrastructure projects requiring bulk supply.
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