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China Surge Arrester Y5(10)W-9J Factory Suppliers | 9kV, 5kA/10kA Gapless Protection for Overhead Transformers
Product Overview
The Y5(10)W-9J is a 9kV gapless metal-oxide surge arrester purpose-built for distribution transformer protection on overhead lines. Its ZnO varistor core instantly diverts overvoltage energy to ground, limiting lightning residual voltage to 27kV and switching residual to 23.8kV. With a maximum continuous operating voltage of 7.65kV and high current withstand of 65kA/100kA, it handles moderate to severe lightning duty. The polymer housing provides excellent hydrophobicity and pollution resistance, while varistor diameter options (35mm to 42mm) allow energy rating customization. Class 1/Class 2, Design B per IEC 60099-4.
Product Features
- Gapless ZnO varistor design for instantaneous surge response
- Low residual voltages: 27kV lightning, 23.8kV switching
- High current impulse withstand: 65kA / 100kA
- Long duration impulse withstand: 150A / 250A
- Varistor diameters: 35mm, 38mm, 40mm, 42mm
- Optional: bracket, disconnector, earth lead, bird guard, line clamp
Product Advantages
Rapid Overvoltage Clamping
Gapless ZnO design ensures immediate protection against lightning and switching surges.
Strong Pollution Resistance
Polymer housing resists contaminants and moisture, ideal for heavy pollution areas.
Customizable Energy
Multiple varistor sizes and dual discharge ratings adapt to varying lightning exposure levels.
Durable Connections
Stainless steel 304 terminals prevent corrosion and maintain low contact resistance over time.
Enhanced Safety Options
Disconnector isolates failed units; bird guard cap prevents animal-related flashovers.
Applications
9kV overhead distribution transformer protection
Pole-mounted transformer surge protection in medium-voltage networks
Distribution feeder and tap line lightning protection
Switchgear and recloser overvoltage protection
Rural electrification networks in lightning-prone regions
Technical Parameters
| Electrical Characteristics | |||
|---|---|---|---|
| Parameter | Specification | Unit | |
| Rated voltage of Surge arrester | 9 | kV | |
| Nominal discharge current | 5 | 10 | kA |
| Rated frequency | 50 | Hz | |
| Maximum continuous operating voltage (MCOV) | 7.65 | kV | |
| Steep current impulse residual voltage | 33.7 | kV (Crest) | |
| Lightning Impulse residual voltage | 27 | kV (Crest) | |
| Switching Impulse residual voltage | 23.8 | kV (Crest) | |
| Long duration current impulse withstand voltage | 150 | 250 | A |
| High current impulses | 65 | 100 | kA (Crest) |
| Rated Short-circuit current | 20 / 12 / 6 / 0.6 ± 0.2 | kA | |
| Class of Surge arrester | Class 1 or Class 2 | ||
| Application | Distribution type | ||
| With or without gap | Gapless | ||
| Designation of arrester | Design B | ||
| Spare Parts & Accessories | |
|---|---|
| NEMA A or B mounting bracket | with / without |
| Disconnector | with / without |
| Earth lead | with / without |
| Bird guard cap | with / without |
| Line clamp | with / without |
| Upper terminal (incoming line) bolt size | M12 |
| Lower terminal (outgoing line) bolt size | M10 |
| Material Specifications | |
|---|---|
| Upper terminal | Stainless steel 304 |
| Housing | Polymer type |
| Color of housing | Dark grey / light grey |
| Varistor | High quality zinc oxide varistor |
| Size of Varistor | 35mm / 38mm / 40mm / 42mm |
| Service Conditions | ||
|---|---|---|
| Environment maximum temperature | 40 | ℃ |
| Pollution level | Heavy | |
| Altitude | 1000 | Meter |
Frequently Asked Questions (FAQ)
QWhat is the rated voltage and MCOV of the Y5(10)W-9J surge arrester?
The Y5(10)W-9J has a rated voltage of 9kV and a Maximum Continuous Operating Voltage (MCOV) of 7.65kV, making it optimized for overhead distribution transformer networks.
QWhat are the residual voltage levels for lightning and switching impulses?
The unit provides a lightning impulse residual voltage of 27kV (Crest), a switching impulse residual voltage of 23.8kV (Crest), and a steep current impulse residual voltage of 33.7kV (Crest).
QWhat zinc oxide (ZnO) varistor diameters are available?
The varistor core can be configured in 35mm, 38mm, 40mm, or 42mm diameters, providing flexible energy handling capabilities to meet specific lightning duty requirements.
QWhat housing material and terminal hardware are used?
The surge arrester features a high-grade polymer housing (available in dark grey or light grey) suitable for heavy pollution environments, combined with corrosion-resistant Stainless Steel 304 upper terminals (M12 incoming) and M10 lower terminals.
QWhat optional accessories can be ordered with the arrester?
Optional accessories include NEMA Type A or B mounting brackets, a disconnector to isolate failed units, an earth lead, a bird guard cap to prevent animal-related flashovers, and line clamps.
QWhat standard service conditions does this arrester support?
It is designed to operate under standard environmental conditions with an ambient temperature up to 40°C, altitudes up to 1000 meters, and in heavy pollution classifications.
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