October 15, 2026
Metal Oxide Surge Arrester: Types, Specs and Power System Applications
Table of Contents
1. Overview of Metal Oxide Surge Arrester
2. Common Metal Oxide Surge Arrester Types
3. Technical Parameter Performance Comparison
4. Core Working Principles and Features
5. Main Power System Applications
6. Frequently Asked Questions
1. Overview of Metal Oxide Surge Arrester
A metal oxide surge arrester is a key overvoltage protection device for power systems. It use zinc oxide metal oxide resistors as core functional components.
This device has no series internal gaps in most modern designs. It respond fast to transient voltage surges and lightning impulses.
Metal oxide surge arrester keep normal power line voltage stable. It divert surge current to ground and protect electrical equipment from breakdown damage.
It replace traditional gap-type surge arresters in most new power projects. It has better protection performance and longer service life.
2. Common Metal Oxide Surge Arrester Types
2.1 Gapless Metal Oxide Surge Arrester
Gapless metal oxide surge arrester is the mainstream model for modern power grids.
It has no internal discharge gaps. The response speed is much faster than gap-type products.
It work stably under long-term continuous operating voltage. No frequent aging or failure occurs.
2.2 Gapped Metal Oxide Surge Arrester
Gapped surge arrester equip series insulation gaps inside the structure.
It reduce long-term leakage current effectively. It suit harsh outdoor polluted environments.
This type often used for high-voltage transmission line protection projects.
2.3 Polymer Housed Surge Arrester
Polymer housed metal oxide surge arrester adopt silicone rubber outer shell.
It has strong anti-pollution and anti-aging ability. Light weight makes installation easier.
It widely applied in distribution network and outdoor substation facilities.
3. Technical Parameter Performance Comparison
Different voltage-level metal oxide surge arresters have obvious differences in operating parameters and protection capacity. The table below shows standard IEC 60099-4 verified technical data for mainstream models.
Arrester Model | Rated Voltage (kV) | Continuous Operating Voltage (kV) | Nominal Discharge Current (kA) | Lightning Impulse Residual Voltage (kV) | 2ms Square Wave Withstand (A) |
YH10W-18 | 18 | 15.3 | 10 | 54 | 250 |
YH10W-21 | 21 | 17.0 | 10 | 63 | 250 |
YH10W-24 | 24 | 19.5 | 10 | 72 | 250 |
HY1.5W-144 | 144 | 115.8 | 20 | 299 | 600 |
Low and medium voltage models fit 10kV to 35kV distribution networks. It cover most urban and rural power distribution scenarios.
High voltage arresters have higher residual voltage and current withstand capacity. It support stable operation of 220kV high-level transmission systems.
All qualified products control leakage current below 50μA under standard operating conditions. It ensure low power consumption and long-term stability.
4. Core Working Principles and Features
4.1 Nonlinear Voltage Resistance
Metal oxide resistor has strong nonlinear characteristics. It keep high resistance under normal system voltage.
Almost no current pass through the arrester in daily operation.
When surge overvoltage occurs, resistance drop sharply. It release surge current to ground quickly.
4.2 Fast Response Performance
Gapless design remove mechanical discharge delay. Response time less than 25 nanoseconds.
It can suppress steep front impulse voltage that traditional arresters cannot handle well.
4.3 Durable Anti-Aging Ability
Silicon rubber housing resist ultraviolet radiation and environmental corrosion.
Internal metal oxide chips have stable electrical performance. Service life can reach 20 years in standard working environments.
5. Main Power System Applications
5.1 Distribution Network Protection
Medium voltage metal oxide surge arrester protect distribution transformers and line equipment.
It reduce lightning strike damage and sudden overvoltage faults in urban power grids.
5.2 High Voltage Substation
High-capacity surge arresters install in 110kV and 220kV substations.
It protect transformers, switches and other core substation equipment.
5.3 Industrial Power System
Factory power rooms and industrial distribution stations use customized surge arresters.
It avoid equipment burnout caused by instantaneous voltage surges.
6. Frequently Asked Questions
Q1: What is the advantage of gapless metal oxide surge arrester?
A1: Gapless models have faster response speed, lower leakage current and more stable performance. It no need frequent maintenance, ideal for long-term grid operation.
Q2: What standard do modern surge arresters follow?
A2: Formal metal oxide surge arrester products comply with IEC 60099-4 international standards. All electrical parameters pass strict professional testing.
Q3: What is the main function of a polymer housed arrester?
A3: Polymer silicone rubber shell improve outdoor anti-pollution and anti-aging performance. It also reduce overall weight for easier field installation.
Q4: How to choose the right arrester model?
A4: Users select models based on system rated voltage, nominal discharge current and on-site environmental conditions. Matching continuous operating voltage is the most critical index.