HY2.5WD Low Voltage Station Type Zinc Oxide Arrester Composite Housing Technology

Product Overview

HY2.5WD low voltage station type zinc oxide arrester is currently the best type of overvoltage protection device with excellent performance, widely used in power generation, transmission, transformation and distribution systems to protect the insulation of electrical equipment from overvoltage damage. Its core components adopt zinc oxide resistor discs with excellent nonlinear volt-ampere characteristics, greatly improving overvoltage current carrying capacity. Under normal operating voltage, the current through the arrester is only microampere level. When subjected to overvoltage, due to the nonlinearity of zinc oxide resistance, the current through the arrester instantly reaches thousands of amperes, and the arrester is in a conducting state releasing overvoltage energy, thereby effectively limiting overvoltage damage to transmission and transformation equipment.

Organic housing metal oxide arresters are a scientific research achievement combining organic insulation materials with traditional porcelain housing metal oxide arrester technology advantages. The HY2.5WD series not only has the advantages of porcelain housing metal oxide arresters, but also has good electrical insulation performance, high dielectric strength, anti-tracking, anti-corrosion, heat resistance, cold resistance, aging resistance, explosion-proof, hydrophobicity, and reliable sealing performance.

HY2.5WD low voltage arrester is suitable for AC 220kV and below power generation, transmission, transformation and distribution systems, used to limit the amplitude of lightning and system internal operating overvoltages to specified levels. It is the basic equipment for system insulation coordination and an ideal lightning protection component for integrated, modular medium and high voltage transmission and transformation complete equipment. Common models include HY2.5WD-1.3/3.6 and HY2.5WD-0.26/7.2.

Main Technical Parameters

Technical Features

• Excellent nonlinear volt-ampere characteristics

  HY2.5WD low voltage station type zinc oxide arrester uses high-purity zinc oxide resistor discs with extremely low nonlinear coefficient. Under normal conditions, leakage current is less than 50μA. During overvoltage, it quickly conducts to release energy with nanosecond response time, effectively protecting equipment insulation.

• Composite housing sealed explosion-proof

  Adopts silicone rubber composite housing integrated injection molding process, with excellent overall sealing performance and no internal moisture risk. The composite housing has excellent hydrophobicity and aging resistance, maintaining high insulation strength in polluted and humid environments, with explosion-proof structure design for safe and reliable operation.

• Large current carrying capacity and low residual voltage

  The HY2.5WD-0.26/7.2 model has residual voltage of only 2.6kV under lightning impulse current, square wave current capacity up to 75A, high current impulse withstand 25kA, capable of withstanding multiple lightning strikes and switching overvoltage impacts, suitable for station scenarios with frequent transient overvoltages.

• Maintenance-free design and long service life

  The product adopts fully sealed maintenance-free structure, requiring no regular inspection of internal gas or component replacement. The composite housing is UV-resistant and ozone-resistant, with outdoor service life up to 20 years or more, significantly reducing full lifecycle operation and maintenance costs.

Application Scenarios

HY2.5WD low voltage station type zinc oxide arresters are widely used for overvoltage protection of electrical equipment in power plants, substations, distribution lines and industrial enterprises with AC 220kV and below voltage grades. Specific scenarios include:

• Low voltage auxiliary power systems in power plants: Protecting generators, exciters, station transformers and other equipment from lightning intrusion waves and switching overvoltage damage.

• Substation distribution devices: Installed near busbars, circuit breakers, disconnecting switches and other equipment to limit overvoltage amplitude and ensure insulation coordination.

• Urban distribution networks: Used in compact substations, ring main units, cable branch boxes and other distribution equipment to improve power supply reliability.

• Industrial and mining enterprise electrical systems: Protecting motors, frequency converters, soft starters and other sensitive loads, reducing unplanned shutdowns.

Applicable Standards

This product model is compiled according to JB/T8459-1996 "Arrester Product Model Designation Method". Gapless products comply with GB11032-2000 "AC Gapless Metal Oxide Arresters" standard; gapped products comply with JB/T9672-2005 "Metal Oxide Arresters with Series Gaps" standard. Important parameters and configuration methods not clearly defined in the above standards shall be modified and implemented according to DL/T620-1997 "Overvoltage Protection and Insulation Coordination of AC Electrical Installations".

Selection Guide

When selecting HY2.5WD low voltage station type zinc oxide arresters, determine based on system rated voltage, continuous operating voltage, lightning impulse residual voltage and installation environment. For system rated voltage 0.66kV, HY2.5WD-1.3/3.6 is recommended; for system rated voltage 1.14kV, HY2.5WD-0.26/7.2 is recommended. Installation can be base fixed or suspended type, with lead wire cross-section meeting short-circuit capacity requirements. If used in plateau, high altitude or heavy pollution areas, please consult the manufacturer for customized solutions.

Summary

HY2.5WD low voltage station type zinc oxide arrester, with composite housing technology, excellent nonlinear volt-ampere characteristics and maintenance-free design, has become a reliable choice for overvoltage protection in power generation, transmission, transformation and distribution systems. The product strictly complies with GB11032-2000 and DL/T620-1997 standards, offering HY2.5WD-1.3/3.6 and HY2.5WD-0.26/7.2 two common specifications, meeting the insulation coordination requirements of station type equipment at different voltage levels.

Outline Dimensions