HY(YH)5WS-10kV Station-Type Surge Arrester
Product Overview
The HY(YH)5WS series surge arresters (models HY(YH)5WS-12.7/50 and HY(YH)5WS-17/50) are gapless metal oxide surge arresters specifically designed for 10kV power stations and distribution systems. Encapsulated in a silicone rubber composite housing, these arresters provide excellent lightning protection and overvoltage suppression performance. They effectively limit lightning overvoltages and switching overvoltages to protect station equipment, distribution lines, transformers, switchgear, and other apparatus from damage. They are widely applied in 10kV power stations and distribution systems.
Product Features
Electrical and Protective Performance
Utilizing high-performance zinc oxide varistors with superior volt-ampere characteristics, the arresters exhibit low residual voltage and high current-handling capacity, effectively limiting lightning overvoltages and switching overvoltages in 10kV systems to protect station equipment insulation from damage.
Fast response speed enables instantaneous operation upon overvoltage occurrence, promptly discharging lightning current to prevent overvoltage from penetrating equipment, with stable and reliable protection performance.
Excellent nonlinear volt-ampere characteristics result in extremely low leakage current and minimal power dissipation under normal operating voltage. Under overvoltage conditions, the arrester conducts rapidly and automatically restores to an insulating state after discharging current, requiring no maintenance.
Structural and Safety Features
The seamless, void-free integral silicone rubber composite housing provides superior sealing performance, effectively preventing moisture and contaminants from penetrating the interior and protecting the varistor elements from moisture-induced damage.
The integrated modular structure design offers high mechanical strength with resistance to impact and vibration, capable of withstanding mechanical stresses during transportation, installation, and operation without risk of deformation or damage.
Factory-installed upper and lower M10 threaded terminal connectors enable convenient installation by direct series connection between distribution lines and ground, requiring no additional auxiliary equipment and accommodating a variety of installation configurations.
The gapless design eliminates follow current during operation, removing the risk of explosion or fire caused by power-frequency follow current, ensuring a high level of operational safety.
Environmental and Weather Resistance
Excellent weatherability allows adaptation to a wide temperature range of -40°C to +90°C. The silicone rubber housing maintains its elasticity and insulating properties at both high and low temperatures without risk of cracking or embrittlement, making it suitable for outdoor and indoor station applications.
Resistance to moisture, water, contamination, and salt spray enables long-term stable operation in harsh environments including humid, dusty, and salt-laden atmospheres without susceptibility to rain or condensation. The high hydrophobicity of the silicone rubber surface effectively prevents surface flashover.
Anti-aging, UV-resistant, and ozone-resistant properties support a service life exceeding 20 years with maintenance-free operation, reducing long-term operational and maintenance costs.
Mechanical and Compatibility Features
High mechanical strength with impact and vibration resistance enables the arrester to withstand mechanical stresses generated by lightning current impulses without risk of deformation or damage. Seismic resistance rating reaches Grade 8.
Compatible with 10kV power stations and distribution systems, the arrester can be installed on station equipment, distribution transformers, switchgear, cable terminations, and various other apparatus, offering strong universality.
Compact size and light weight facilitate convenient installation, allowing direct mounting on equipment enclosures or support structures without complex installation procedures.
Technical Parameters
| Parameter Category | Item | HY(YH)5WS-12.7/50 | HY(YH)5WS-17/50 |
|---|---|---|---|
| Rated Electrical Parameters | System Voltage (Un) | 10kV | 10kV |
| | Arrester Rated Voltage (Ur, r.m.s.) | 12.7kV | 17kV | |
| | Continuous Operating Voltage (Uc, r.m.s.) | 6.6kV | 13.6kV | |
| | DC 1mA Reference Voltage (minimum) | 25kV | 25kV | |
| | Maximum Residual Voltage under Steep Current Impulse (peak) | 57.5kV | 57.5kV | |
| | Maximum Residual Voltage under Lightning Impulse Current (peak) | 50kV | 50kV | |
| | Maximum Residual Voltage under Switching Impulse Current (peak) | 42.5kV | 42.5kV | |
| | 2000μs Square Wave Current Withstand Capacity | 75A | 75A | |
| | 4/10μs High Current Withstand Capability | 65kA | 65kA | |
| | Maximum Leakage Current at 0.75× DC Reference Voltage | 50μA | 50μA | |
| | Creepage Distance | 645mm | 645mm | |
| Structural and Material Parameters | Primary Materials | Zinc oxide varistor elements (core), silicone rubber (housing), tin-plated copper (terminals) | Zinc oxide varistor elements (core), silicone rubber (housing), tin-plated copper (terminals) |
| | Ingress Protection Rating | IP65 | IP65 | |
| | Construction Type | Gapless metal oxide surge arrester | Gapless metal oxide surge arrester | |
| | Terminal Connector Specification | M10 threaded | M10 threaded | |
| | Overall Dimensions | Φ85mm × 255mm (total height) | Φ85mm × 255mm (total height) | |
| Environmental Parameters | Applicable Altitude | ≤2000m (high-altitude versions available on request) | ≤2000m (high-altitude versions available on request) |
| | Ambient Temperature | -40°C to +90°C (operating), -40°C to +70°C (storage) | -40°C to +90°C (operating), -40°C to +70°C (storage) | |
| | Relative Humidity | ≤100% (non-condensing) | ≤100% (non-condensing) | |
| | Seismic Resistance Rating | Grade 8 | Grade 8 | |
| Applicable Standards | | GB 11032 Metal Oxide Surge Arresters Without Gaps for A.C. Systems; DL/T 804 Application Guide for Metal Oxide Surge Arresters in A.C. Power Systems | GB 11032 Metal Oxide Surge Arresters Without Gaps for A.C. Systems; DL/T 804 Application Guide for Metal Oxide Surge Arresters in A.C. Power Systems |
Application Scope
Applicable voltage level: 10kV AC power stations and distribution systems.
Applicable scenarios:
Lightning protection for 10kV power station distribution lines and cable circuits;
Lightning protection for station equipment including distribution transformers, switchgear, and cable terminations;
Lightning protection for outdoor/indoor power stations, pad-mounted substations, and renewable energy (photovoltaic/wind power) step-up substations;
Lightning protection for industrial and mining enterprise distribution systems and urban distribution network systems.
Functional purpose: To limit lightning overvoltages and switching overvoltages, discharge lightning current to ground, protect the insulation of power station equipment and distribution lines and apparatus from damage, prevent equipment breakdown and burnout failures caused by overvoltages, and ensure the safe and stable operation of 10kV power stations and distribution systems.
Operating Conditions
Normal Operating Conditions
Altitude: ≤2000m;
Ambient temperature: -40°C to +90°C; equipment operating temperature complies with applicable standards;
Relative humidity: ≤100% (non-condensing);
Environmental conditions: free from corrosive gases, flammable or explosive media, and severe vibration or impact;
Installation method: fixed installation via upper and lower terminal connectors; upper terminal connected to distribution line/equipment, lower terminal reliably earthed; installation space must satisfy insulation clearance requirements.
Special Operating Conditions (Customization Required)
Altitude exceeding 2000m;
Ambient temperature outside the range of -40°C to +90°C;
Severe contamination, salt spray, or chemical corrosion environments;
High vibration or high impact operating conditions;
Non-standard voltage levels or special current-handling capacity requirements.
Installation and Maintenance
Installation Requirements
Before installation, inspect the product appearance to verify that the silicone rubber housing is free from cracks, damage, and voids, and that the terminal connectors are intact, free from corrosion and deformation.
Clean the terminal connector surfaces to remove grease, dust, and foreign matter, ensuring terminals are dry and clean. Check the earth resistance of the grounding device to confirm it meets requirements (≤10Ω for 10kV systems).
Connect the upper terminal of the arrester to the distribution line/equipment and reliably earth the lower terminal. Tighten the terminal connectors to the specified torque. Upon completion of installation, verify that the arrester is mounted vertically, without looseness or inclination.
After installation, perform an insulation resistance test and confirm satisfactory results before energizing.
Maintenance Requirements
Periodically inspect the product appearance to verify that the silicone rubber housing is free from cracks, damage, discharge traces, and contamination accumulation, that terminal connections are secure without looseness, and that the earth connection is reliable and free from corrosion.
Periodically test insulation resistance and leakage current to confirm performance meets requirements and to identify latent faults in a timely manner.
Clean the product surface to remove accumulated dust and contamination, keeping the silicone rubber surface dry and clean, and preventing deterioration from grease and chemical substances.
If the product exhibits abnormalities such as cracks, damage, discharging, or insulation resistance exceeding specified limits, immediately take it out of service and replace it. Operation of a defective unit is strictly prohibited.
Precautions
The product must be installed, commissioned, and maintained by qualified electrical personnel with medium-voltage distribution system work certification. Operation by non-qualified personnel is strictly prohibited.
The product must be used with distribution equipment of the corresponding voltage level. Mismatching with equipment of a different voltage level is strictly prohibited, as it will result in protection failure and safety incidents.
The product must not be disassembled or modified without authorization, as doing so will void the warranty and safety assurance. Use of non-specialized tools to forcibly install or remove terminal connectors is strictly prohibited.
During installation, damage to the silicone rubber housing is strictly prohibited. Terminal connectors must be tightened to the specified torque to prevent poor contact leading to overheating and discharging.
During storage, the product must be kept in a dry, ventilated, and cool environment, away from direct sunlight, high temperatures, moisture, and compression. Contact with sharp objects that could damage the silicone rubber housing is strictly prohibited.
During operation, periodically check the earth resistance of the grounding device to ensure reliable earthing and to prevent protection failure resulting from inadequate grounding.
Model Designation
| Model Identifier | Meaning |
|---|---|
| HY(YH) | Series designation for composite-housed metal oxide surge arresters |
| 5 | Nominal discharge current class (5kA) |
| W | Gapless construction designation |
| S | Station-type designation |
| 10kV | Applicable system voltage level, 10kV power station and distribution system |
| 12.7/50, 17/50 | Arrester rated voltage / lightning impulse residual voltage (peak value) |
Applicable Standards and Certifications
International standard: IEC 60099-4, Metal Oxide Surge Arresters Without Gaps for A.C. Systems;
National standards: GB 11032, Metal Oxide Surge Arresters Without Gaps for A.C. Systems; DL/T 804, Application Guide for Metal Oxide Surge Arresters in A.C. Power Systems;
The product has passed type testing by the National High-Voltage Electrical Equipment Quality Supervision and Inspection Center and complies with national electrical power industry standards.
After-Sales Service
Product warranty period: 18 months from the date of ex-factory shipment, or 12 months from the date of commissioning, whichever comes first;
During the warranty period, products with quality defects will be repaired or replaced free of charge;
Technical support, installation guidance, and customization services are available (special specifications and special operating condition adaptations).
Document Notes
The technical parameters in this manual are based on standard operating conditions. Special operating conditions require customization based on actual requirements. The product technical agreement and type test report shall prevail as the final reference.
Appendix: Product Dimensional Diagram