27.5kV Railway Porcelain Gapless Surge Arrester
Product introduction:
Normally there are 2 kinds of DC SA for railway system:
1/ 750V, Ur=1.0kV, 8/20μs residual voltage at 20kA: 2.4kV;
2/ 1500V, Ur=2.0kV, 8/20μs residual voltage at 20kA: 4.8kV.
A porcelain surge arrester is a type of surge arrester that features a housing made of porcelain, a ceramic material. This type of surge arrester is also known as a ceramic surge arrester.
Porcelain surge arresters are designed to protect electrical equipment and systems from voltage surges or transients caused by lightning strikes, switching operations, or other transient events. The porcelain housing provides mechanical support and insulation to the internal components of the surge arrester.
Porcelain surge arrester is of high mechanical strength, longer creepage distance, excellent electrical insulation performance, strong dielectric strength, tracking resistance, high- and low-temperature resistance and sandstorm resistance. The multi-sealing structure of the housing provides high sealing performance and long service life.
Porcelain surge arresters have been widely used in power distribution systems, substations, and other high-voltage applications. They are known for their mechanical strength, excellent electrical insulation properties, and resistance to environmental factors such as moisture, UV radiation, and pollution. Porcelain housing provides robust and durable protection for the internal surge suppression elements.
Shendian takes lead of SA in China, its product is widely used in State Grid Corporation of China (SGCC) and China Southern Power Grid (CSG), among them including many extraordinary projects: (1) 1,000kV UHV Southeast Shanxi Substation of 1,000kV Southeast Shanxi - Nanyang - Jingmen UHVAC Pilot Demonstration Project, (2) Extension Works of 1,000kV Nanyang Switching Station of 1,000kV Southeast Shanxi - Nanyang - Jingmen UHV AC Pilot Demonstration Project, (3) South Hami Converter Station of ±800kV Hami- Zhengzhou UHVDC Electricity Transmission Project, (4) 750kV Qinghai Qaidam Substation and 500kV Baoji - Deyang DC Electricity Transmission Project, as well as (5) DC Project of 500kV Hechi Substation of CSG, (6) DC Project of 500kV Anshun Substation of Guizhou Power Grid Company and 330kV Sanxing Substation in Xi'an High-tech Zone.
Advantage:
1/ High mechanical strength;
2/ Longer creepage distance;
3/ High dielectric insulation level;
4/ Tolerance to high/low temperature;
5/ Anti-corrosion and anti-aging;
Standard Technical Data:
Below info. only for your reference, all data shall be specified and determined by technical specification and customer demand.
A: Nominal system voltage ≤55kV
| Item | Description | | Offered | Offered | Offered |
| 1 | Manufacture/ Country of Origin | | Xi'an Shendian/ China |
| 2 | Model | | Y5WT-42/105 | Y5WT-42/110 | Y5WT-42/120 |
| 3 | Applicable standard | | IEC 60099-4 | IEC 60099-4 | IEC 60099-4 |
| 4 | Type | | Outdoor, ZnO, gapless |
| 5 | Norminal voltage of system | kV | 27.5 | 27.5 | 27.5 |
| 6 | Earthing system | | Effectively earthed |
| 7 | Rated frequency | Hz | 50/60 | 50/60 | 50/60 |
| 8 | Rated voltage of SA | kV | 42 | 42 | 42 |
| 9 | Maximum continuous operating voltage | kV | 31.5 | 31.5 | 34 |
| 10 | Power frequency reference voltage | kV | 58 | 60 | 65 |
| 11 | - at reference current of
Note: State peak value or rms. | mA (D.C) | 1 | 1 | 1 |
| 12 | Nominal discharge current | kA | 5 | 5 | 5 |
| 13 | (a) Lightning impulse | kV | ≤105 | ≤110 | ≤120 |
| (b) Steeping impulse | kV | ≤118 | ≤127 | ≤138 |
| (c) Switching impulse | kV | ≤89 | ≤94 | ≤98 |
| 14 | Material employed in series non-linear resistor | | ZnO etc. | ZnO etc. | ZnO etc. |
| 15 | - Material | | Brown Porcelain | Brown Porcelain | Brown Porcelain |
| - Minimum creepage distance | mm/kV | 25/31 | 25/31 | 25/31 |
| 16 | - HV terminal | | hot zip screw | hot zip screw | hot zip screw |
| - earth terminal | | hot zip screw | hot zip screw | hot zip screw |
| 17 | Diameter of bushing sheds | mm | 232 | 232 | 232 |
| 18 | Height | mm | 995 | 995 | 995 |
Schematic diagram:
Reference:
1/ Shendian MOA is widely used in China EHV (Extra hight voltage) projects of State Grid, Southern Power Grid.
2/ Supplied MOA to ABB/Siemens/Schneider more than 20 years, as well as other capacitor/switchgear manufacturers.
3/ Shendian MOA has been exported to more than 30 counties all over the world.
