Metal-Oxide Surge Arrester
1. Series 1---Polymer housed Metal-Oxide Surge Arrester
2. Series 2-- Polymer housed Metal-Oxide Surge Arrester
3. Series 3---Porcelain Housed Metal- Oxide Surge Arrester
4. Series 4—Station Class Surge Arresters
Operating Principle
The metal oxide arrester provides the most advanced protection against over-voltage in the world, since MOA's resistors are made up of Zinc Oxide films. MOA has good voltage-ampere characteristics as compared with silicon carbide arrester, it is Volt-Ampere characteristics is much superior and results in much better performance.
A micro ampere level current flows while MOA is operating under normal voltage, but the amount of the current will be thousands amperes when MOA is subjected to over-voltage, because of MOA has a good non-linear characteristics. Hence MOA provide excellent prection for the HV equipment, especially the transformers, cables and switchgear.
Application
The metal oxide arrester which applies to protect the power equipment like transformers against system overvoltages and lightning surges.
Service Conditions
Ambient Conditions: -40°C to 40°C
Height about sea level: ≤1000m
Power supply frequency: 48-62HZ
Earthquake intensity: Not exceed Richter 7.0 grade
Maximum wind velocity: ≤35m/s
The long-term power running voltage should not over the continuous operating voltage.
The altiplano or contaminated area should be indicated.
Series 1 Polymer Housed Metal-oxide Surge Arresters(KEMA)
Main Technical Data
| Model (10KA) | Rated Voltage(kV) | MCOV (kV) | Max. Residual Voltage(kV) | 2000 us Rectangular Current Withstand(A) | 4/10 us High Current Impulse | Domension (mm) | No. of Sheds | Creepage distance (mm) | |||
| Steep Current Impulse 1/10us | Lightning Impulse 8/20us | Switching Current Impulse 30/60us | A | B | |||||||
| HDA1-10/6 | 6 | 4.8 | 20.7 | 18 | 15.3 | 250 | 100 | 250 | 125 | 3 | 210 |
| HDA1-10/9 | 9 | 7.2 | 31 | 27 | 23 | 250 | 100 | 280 | 155 | 4 | 280 |
| HDA1-10/11 | 11 | 8.8 | 37.9 | 33 | 28.1 | 250 | 100 | 310 | 185 | 5 | 350 |
| HDA1-10/12 | 12 | 9.6 | 41.5 | 36 | 30.6 | 250 | 100 | 310 | 185 | 5 | 351 |
| HDA1-10/15 | 15 | 12 | 52 | 45 | 38.3 | 250 | 100 | 340 | 215 | 6 | 419 |
| HDA1-10/18 | 18 | 14.4 | 62 | 54 | 46 | 250 | 100 | 370 | 245 | 7 | 487 |
| HDA1-10/21 | 21 | 16.8 | 72.5 | 63 | 53.5 | 250 | 100 | 400 | 275 | 8 | 555 |
| HDA1-10/24 | 24 | 19.2 | 82.5 | 72 | 61.2 | 250 | 100 | 430 | 305 | 9 | 622 |
| HDA1-10/27 | 27 | 21.6 | 93.2 | 81 | 69 | 250 | 100 | 460 | 335 | 10 | 690 |
| HDA1-10/30 | 30 | 24 | 103.5 | 90 | 76.5 | 250 | 100 | 520 | 395 | 12 | 760 |
| HDA1-10/33 | 33 | 26.4 | 113.8 | 99 | 84.2 | 250 | 100 | 550 | 425 | 13 | 894 |
| HDA1-10/36 | 36 | 28.85 | 124.2 | 108 | 91.8 | 250 | 100 | ||||
