What is ZnO Gapless Surge Arrester and Why Do We Use Them?

Overview

Gapless Metal Oxide Surge Arrester which uses zinc oxide semiconductor as a resistor material, such type of arrester is known as a metal oxide surge arrester or ZnO Diverter. This arrester provides protection against all types of AC and DC over voltages. It is mainly used for overvoltage protection at all voltage levels in a power system.

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Advantages

1. It eliminates the risk of spark over and also the risk of shock to the system when the gaps break down.

2. It eliminates the need for a voltage grading system.

3. At the normal operating condition, the leakage current in the ZnO is very low as compared to other diverters.

4. There is no power following the current in ZnO diverter.

5. It has a high energy absorbing capability.

6. ZnO diverters possess high stability during and after prolonged discharge.

7. In ZnO diverter, it is possible to control the dynamic overvoltage in addition to switching surges. This results in economic insulation coordination.

Working Condition

1. Ambient air temperature: -40℃~+40℃.

2. Altitude：<=m.

3. Frequency: 48Hz~62Hz.

4. Power frequency voltage applied between terminals of surge arrester must not exceed continuous operating voltage of surge arrerter.

5. Earthquake intensity is less than 8 degrees.

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6. Max. Wind speed is 35m/s.

Technical Data

1. 5kA Metal oxide Polymer Housing (Gapless) type Surge Arrester for A.C System

Model Rated Voltage (kV) Continuous operating Voltage (kV) Lightening impulse residual voltage under nominal discharge current(≤KV) Creepage distance (mm) 2ms square wave impulse
current withstands (A) 4/10 μs high current
impulse
Withstands (KA) YH-5W-6 6 5.1 18 320 150 65 YH-5W-9 9 7.65 27 430 YH-5W-12 12 10.2 36 430 YH-5W-15 15 12.75 45 530 YH-5W-18 18 15.3 54 530 YH-5W-21 21 16.8 63 640 YH-5W-24 24 19.2 72 640 YH-5W-27 27 21.6 81 740 YH-5W-30 30 24 90 890 YH-5W-33 33 26.4 99 890 YH-5W-36 36 28.8 108

2. 10kA Metal oxide Polymer Housing (Gapless) type Surge Arrester for A.C System

Model Rated Voltage (kV) Continuous operating Voltage (kV) Lightening impulse residual voltage under nominal discharge current(≤KV) Line discharge
class Creepage distance (mm) 2ms square wave impulse
current withstands (A) 4/10 μs high current
impulse
Withstands (KA) YH-10W-6 6 5.1 18 1 320 250 100 YH-10W-9 9 7.65 27 430 YH-10W-12 12 10.2 36 430 YH-10W-15 15 12.75 45 530 YH-10W-18 18 15.3 54 530 YH-10W-21 21 16.8 63 640 YH-10W-24 24 19.2 72 740 YH-10W-27 27 21.6 81 740 YH-10W-30 30 24 90 890 YH-10W-33 33 26.4 99 890 YH-10W-36 36 28.8 108 YH-10W-42 42 33.6 126 2 400 YH-10W-48 48 39 139 YH-10W-54 54 42 160 YH-10W-60 60 48 178 YH-10W-66 66 52.8 196 YH-10W-72 72 57 214 YH-10W-84 84 67.2 244 YH-10W-90 90 72.5 249 YH-10W-96 96 75 265 3 800 YH-10W-108 108 84 281 YH-10W-120 120 96 300 YH-10W-150 150 120 416 YH-10W-200 200 156 520

3. 20kA Metal oxide Polymer Housing (Gapless) type Surge Arrester for A.C System

Model Rated Voltage (kV) Continuous operating Voltage (kV) Lightening impulse residual voltage under nominal discharge current(≤KV) Line discharge
class Creepage distance (mm) 2ms square wave impulse
current withstands (A) 4/10 μs high current
impulse
Withstands (KA) YH-20W-108 108 84 281 3 800 100 YH-20W-120 120 96 300 YH-20W-150 150 120 416 YH-20W-200 200 156 520

4. 5kA Metal Oxide Porcelain Housing (Gapless) type Surge Arrester for A.C. System

Model Rated Voltage (kV) Continuous operating Voltage (kV) Lightening impulse residual voltage under nominal discharge current(≤KV) Creepage distance (mm) 2ms square wave impulse
current withstands (A) 4/10 μs high current
impulse
Withstands (KA) Y5W-6 6 5.1 18 320 150 65 YH-5W-9 9 7.65 27 430 Y5W-12 12 10.2 36 430 Y5W-15 15 12.75 45 530 Y5W-18 18 15.3 54 530 Y5W-21 21 16.8 63 640 Y5W-24 24 19.2 72 640 Y5W-27 27 21.6 81 740 Y5W-30 30 24 90 890 Y5W-33 33 26.4 99 890 Y5W-36 36 28.8 108

5. 10kA Metal Oxide Porcelain Housing (Gapless) type Surge Arrester for A.C. System

Model Rated Voltage (kV) Continuous operating Voltage (kV) Lightening impulse residual voltage under nominal discharge current(≤KV) Line discharge
class Creepage distance (mm) 2ms square wave impulse
current withstands (A) 4/10 μs high current
impulse
Withstands (KA) Y10W-6 6 5.1 18 1 280 250 100 Y10W-9 9 7.65 27 320 Y10W-12 12 10.2 36 320 Y10W-15 15 12.75 45 450 Y10W-18 18 15.3 54 450 Y10W-21 21 16.8 63 450 Y10W-24 24 19.2 72 510 Y10W-27 27 21.6 81 510 Y10W-30 30 24 90 890 Y10W-33 33 26.4 99 890 Y10W-36 36 28.8 108 890 Y10W-42 42 33.6 126 2 400 Y10W-48 48 39 139 Y10W-54 54 42 160 Y10W-60 60 48 178 Y10W-66 66 52.8 196 Y10W-72 72 57 214 Y10W-84 84 67.2 244 Y10W-90 90 72.5 249 Y10W-96 96 75 265 3 800 Y10W-108 108 84 281 Y10W-120 120 96 300 Y10W-150 150 120 416 Y10W-200 200 156 520

6. 20kA Metal Oxide Porcelain Housing (Gapless) type Surge Arrester for A.C. System

Model Rated Voltage (kV) Continuous operating Voltage (kV) Lightening impulse residual voltage under nominal discharge current(≤KV) Line discharge
class Creepage distance (mm) 2ms square wave impulse
current withstands (A) 4/10 μs high current
impulse
Withstands (KA) Y20W-108 108 84 281 3 800 100 Y20W-120 120 96 300 Y20W-150 150 120 416 Y20W-200 200 156 520 Y20W-444 444 324 4

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