Product Overview
JY HY5WZ-42/120 JY HY5WZ-51/134 Inner-cone plug-in surge arrester are separable metal oxide varistor (MOV) arresters designed specifically for 10kV/35kV medium- and high-voltage power distribution systems. Featuring an inner cone plug-in structure, they are used in conjunction with matching inner cone insulating receptacles of corresponding specifications, providing integrated overvoltage protection, lightning protection, and insulation isolation. No complex on-site installation procedures are required. Compatible with inner cone interfaces on distribution equipment, these arresters are key components for building lightning protection in high-voltage power distribution systems.
Product Features
Electrical and Protective Performance
High-performance zinc oxide varistor discs are employed, delivering excellent volt-ampere characteristics, low residual voltage, and high current discharge capacity, effectively limiting lightning overvoltages and switching overvoltages to protect distribution equipment from overvoltage damage.
The housing is integrally injection-molded from high-purity EPDM (ethylene propylene diene monomer) rubber, forming a seamless, void-free structure with outstanding insulation performance capable of withstanding the system rated voltage and short-duration overvoltages. Partial discharge level ≤10pC (at 1.5U₀).
An integrated electric field optimization structure uniformly distributes the electric field at the interface, effectively suppressing partial discharge. Long-term operation is free from electrical erosion and breakdown risk, ensuring stable and reliable insulation performance.
A built-in grounding connection structure provides reliable grounding, effectively dissipating lightning currents and overvoltage currents to enhance system safety.
Structural and Safety Features
The standardized inner cone plug-in interface design strictly complies with GB/T 12706 and IEC 60840 standards, enabling universal interchangeability with inner cone insulating receptacles of corresponding specifications. Strong compatibility allows adaptation to distribution equipment interfaces across different voltage levels.
The integrated structure features an inner cone interface at the front end and a grounding terminal at the rear end. Installation is accomplished by direct insertion into the mating receptacle without additional tools, enabling convenient on-site installation and significantly reducing construction time.
Mis-insertion and cross-connection prevention design ensures interface dimensions uniquely match only the corresponding receptacle specification, eliminating the risk of mixing accessories of different ratings. A built-in positioning and locking structure prevents loosening and disengagement after installation.
The fully insulated, touch-safe structure provides high outer insulation strength. The housing may be directly contacted during operation without risk of electric shock, ensuring the safety of operations and maintenance personnel.
Environmental and Weather Resistance
Excellent weatherability enables adaptation to a wide temperature range of -40°C to +90°C. Rubber elasticity, insulation performance, and zinc oxide varistor disc performance remain undiminished at extreme temperatures, with no risk of cracking or embrittlement, suitable for both outdoor and indoor applications.
Moisture-proof, waterproof, pollution-resistant, and salt-fog-resistant with IP67 ingress protection rating, enabling long-term stable operation in harsh environments including humidity, heavy dust, and salt fog, unaffected by rainwater or condensation.
Anti-aging, UV-resistant, and ozone-corrosion-resistant, with a service life exceeding 30 years. Maintenance-free operation reduces 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 during transportation, installation, and operation without risk of deformation or damage. Seismic resistance rating: Grade 8.
Two specifications are available — 42/120 and 51/134 — compatible with 10kV (Um=17.5kV) and 35kV (Um=40.5kV) systems respectively, offering broad applicability.
The modular design allows individual plug-in replacement without power outage, significantly improving operational and maintenance efficiency and reducing outage losses.
Technical Parameters
| Parameter Category | Item | JY HY5WZ-42/120 | JY HY5WZ-51/134 |
|---|---|---|---|
| Rated Electrical Parameters | System Voltage (Un) | 10kV | 35kV |
| | Rated Voltage (Ue) | 42kV | 51kV | |
| | Maximum Operating Voltage (Um) | 17.5kV | 40.5kV | |
| | Rated Frequency (fn) | 50Hz/60Hz | 50Hz/60Hz | |
| | Power Frequency Withstand Voltage | 42kV/5min (dry test) | 95kV/5min (dry test) | |
| | Lightning Impulse Withstand Voltage | 95kV (peak) | 200kV (peak) | |
| | Partial Discharge Level | ≤10pC (at 1.5U₀) | ≤10pC (at 1.5U₀) | |
| | Nominal Discharge Current | 5kA | 5kA | |
| | Residual Voltage (at nominal discharge current) | ≤120kV | ≤134kV | |
| | Continuous Operating Voltage | 17.5kV | 40.5kV | |
| Structural and Material Parameters | Main Material | EPDM rubber (insulating housing), zinc oxide varistor discs (nonlinear elements), tin-plated copper (conductive/grounding inserts) | Same as left |
| | Ingress Protection Rating | IP67 | IP67 | |
| | Interface Standard | Inner cone interface, compliant with GB/T 12706 and IEC 60840 | Same as left | |
| | Mating Receptacle | Inner cone insulating receptacle of corresponding specification | Inner cone insulating receptacle of corresponding specification | |
| Environmental Parameters | Operating Altitude | ≤2000m (high-altitude customization available) | ≤2000m (high-altitude customization available) |
| | Ambient Temperature | -40°C to +90°C (operating), -40°C to +70°C (storage) | Same as left | |
| | Relative Humidity | ≤100% (non-condensing) | ≤100% (non-condensing) | |
| | Seismic Resistance Rating | Grade 8 | Grade 8 | |
| Applicable Standards | GB 11032, GB/T 12706, IEC 60840, GB/T 11022 | Same as left |
Application Scope
Applicable voltage levels: JY HY5WZ-42/120 is compatible with 10kV AC distribution systems (maximum operating voltage 17.5kV); JY HY5WZ-51/134 is compatible with 35kV AC distribution systems (maximum operating voltage 40.5kV).
Applicable equipment and scenarios:
Inner cone insulating receptacle interfaces on 10kV/35kV switchgear, ring main units, compact substations, and other distribution equipment, serving as lightning overvoltage and switching overvoltage protection devices;
Lightning protection for urban distribution cable networks, industrial and mining enterprise distribution systems, and distribution equipment interfaces at renewable energy (photovoltaic/wind power) step-up substations;
Overvoltage protection for distribution equipment in indoor/outdoor distribution rooms, underground utility tunnels, cable tunnels, and other multi-scenario applications.
Functional purpose: To limit lightning overvoltages and switching overvoltages in distribution systems, protecting transformers, cables, switchgear, and other equipment from overvoltage damage, while simultaneously providing insulation isolation and safe grounding — delivering a reliable lightning protection solution for medium- and high-voltage power distribution systems.
Operating Conditions
Normal Operating Conditions
Altitude: ≤2000m
Ambient temperature: -40°C to +90°C; equipment operating temperature complies with relevant standards
Relative humidity: ≤100% (non-condensing)
Environmental conditions: free from corrosive gases, flammable or explosive media, and severe vibration or shock
Installation method: direct insertion into the mating inner cone insulating receptacle; horizontal or vertical mounting is permissible; installation space must accommodate plug-in/pull-out operations; grounding terminal must be reliably earthed.
Special Operating Conditions (customization required)
Altitude exceeding 2000m
Ambient temperature outside the -40°C to +90°C range
Severely contaminated, salt-fog, or chemically corrosive environments
High-vibration or high-impact duty
Non-standard inner cone interface dimensions
Applications requiring special current discharge capacity or residual voltage ratings
Installation and Maintenance
Installation Requirements
Before installation, inspect the product appearance for cracks, damage, and voids; verify that the insulation surface is undamaged. Confirm that the zinc oxide varistor discs are intact and that grounding inserts are free from corrosion and deformation.
Clean the inner wall of the mating inner cone insulating receptacle and the arrester interface surface, removing grease, dust, and foreign matter. Ensure the interface is dry and clean.
Apply a uniform coat of approved silicone grease lubricant to the outer surface of the arrester interface to prevent damage to the insulation layer during installation.
Slowly push the arrester fully into the mating receptacle until completely seated, engage the positioning and anti-withdrawal locking device, and verify that no looseness or tilt is present after installation. Securely connect the grounding terminal to the earthing grid; grounding resistance ≤4Ω.
Upon completion of installation, perform insulation resistance testing and power frequency withstand voltage testing; the unit may be commissioned only upon passing these tests.
Maintenance Requirements
Periodically inspect the arrester for cracks, discharge marks, and surface contamination; verify that the connection to the receptacle is secure and that the grounding terminal connection is free from corrosion.
Periodically test insulation resistance and leakage current to ensure performance meets requirements and to identify potential faults in a timely manner.
Clean the arrester surface to remove accumulated dust and contamination, keeping the insulation surface dry and clean, and preventing degradation from grease or chemical substances.
If abnormalities such as cracks, physical damage, discharge, or excessive leakage current are observed, immediately take the unit out of service and replace it. Operation with known defects is strictly prohibited.
Plug-in and pull-out operations must be performed using approved insulating operating tools. Manual contact with energized interfaces is strictly prohibited. All operations must strictly comply with applicable distribution safety regulations.
Precautions
Installation, commissioning, and maintenance must be performed by qualified electrical personnel holding the appropriate credentials for medium- and high-voltage distribution work. Operation by unqualified personnel is strictly prohibited.
The product must be used with inner cone insulating receptacles of the corresponding specification. Cross-matching receptacles of different voltage levels or specifications is strictly prohibited, as this will cause insulation failure and safety hazards.
The arrester must not be disassembled or modified without authorization, as this will void the warranty and safety assurance. Forced installation or removal using non-approved tools is strictly prohibited.
Damage to the insulation surface during installation is strictly prohibited. Silicone grease lubricant must be applied uniformly to avoid impairing insulation performance and sealing effectiveness. The grounding terminal must be reliably earthed; failure to do so will render overvoltage protection non-functional.
During storage, the product must be kept in a dry, ventilated, cool environment, away from direct sunlight, high temperatures, humidity, and crushing forces. Contact with sharp objects that may damage the insulation layer is strictly prohibited.
When performing live-line plug-in/pull-out operations, all applicable distribution safety regulations must be strictly observed and appropriate safety measures must be in place. Unauthorized operations are strictly prohibited.
Model Designation
| Model Identifier | Meaning |
|---|---|
| JY | Product series code |
| HY5WZ | Zinc oxide arrester series code: HY denotes composite housing; 5 denotes 5kA nominal discharge current; W denotes gapless; Z denotes station-class type |
| 42/120 | 42kV = arrester rated voltage; 120kV = residual voltage at nominal discharge current; compatible with 10kV systems |
| 51/134 | 51kV = arrester rated voltage; 134kV = residual voltage at nominal discharge current; compatible with 35kV systems |
| Inner cone plug lightning arrester | Zinc oxide arrester with inner cone plug-in interface, directly insertable into the mating inner cone receptacle for overvoltage protection |
Applicable Standards and Certifications
International standards: IEC 60099-4 Surge Arresters — Part 4: Metal-oxide surge arresters without gaps for a.c. systems; IEC 60840 Power cables with extruded insulation and their accessories for rated voltages above 30kV (Um=36kV) up to 150kV (Um=170kV) — Test methods and requirements
National standards: GB 11032 Metal-oxide surge arresters without gaps for a.c. systems; GB/T 12706 Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um=1.2kV) to 35kV (Um=40.5kV); GB/T 11022 Common specifications for high-voltage switchgear and controlgear standards
The product has passed type testing by the National High-Voltage Apparatus Quality Supervision and Inspection Center and complies with national electrical safety standards.
After-Sales Service
Product warranty period: 18 months from the date of manufacture, or 12 months from the date of commissioning, whichever occurs first.
Free repair or replacement for product quality issues occurring within the warranty period.
Technical support, installation guidance, and customization services (special specifications, special operating condition adaptation) are provided.
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 definitive reference.
Appendix: Product Outline Drawing
Product Information
General
Key source specifications include Rated Voltage (Ue): 42kV; Power-Frequency Withstand Voltage: 42kV/5min(Dry Test); Lightning Impulse Withstand Voltage: 95kV(Peak); Partial Discharge: ≤10pC(1.5U0at).
Features
Ethylene propylene diene monomer (EPDM) rubber insulation is employed to form a fully insulated, weather-resistant cable accessory structure.
A fully insulated and sealed design is identified for safer operation in medium-voltage distribution equipment.
Loadbreak and energized plug-in/pull-out capability are listed where the matched product specification supports switching operation.
Partial-discharge performance is included in the source specification to support long-term insulation reliability.
Waterproof and dust-resistant protection is specified for harsh indoor or outdoor cable-system environments.
Gapless metal-oxide arrester construction is specified for overvoltage protection in distribution systems.
Application
This 42kV surge arrester is intended for overvoltage protection of cables, transformers, switchgear, substations, and medium-voltage distribution equipment.
Product Images
Technical Parameters
| Parameter Category | Item | JY HY5WZ-42/120 | JY HY5WZ-51/134 |
|---|---|---|---|
| Rated Electrical Parameters | Applicable System Voltage (Un) | 10kV | 35kV |
| Rated Voltage (Ue) | 42kV | 51kV | |
| Maximum Operating Voltage (Um) | 17.5kV | 40.5kV | |
| Rated Frequency (fn) | 50Hz/60Hz | 50Hz/60Hz | |
| Power-Frequency Withstand Voltage | 42kV/5min(Dry Test) | 95kV/5min(Dry Test) | |
| Lightning Impulse Withstand Voltage | 95kV(Peak) | 200kV(Peak) | |
| Partial Discharge | ≤10pC(1.5U0at) | ≤10pC(1.5U0at) | |
| Nominal Discharge Current | 5kA | 5kA | |
| Residual Voltage(NominalDischargeCurrentat) | ≤120kV | ≤134kV | |
| Continuous Operating Voltage | 17.5kV | 40.5kV | |
| Structural and Material Parameters | Main Material | EPDM EPDM Rubber(InsulationHousing) / Zinc Oxide Resistor Disc( ) / Tin-Plated Copper( / Grounding | Same as left |
| Protection Degree | IP67 | IP67 | |
| Interface Standard | GB/T 12706 / IEC 60840 Standard | Same as left | |
| Source specification | Insulation | Insulation | |
| Environmental Parameters | Applicable Altitude | ≤2000m(High-Altitude Version Customizable) | ≤2000m(High-Altitude Version Customizable) |
| Ambient Temperature | -40°C to +90°C(Operating Temperature), -40°C to +70°C(Storage Temperature) | Same as left | |
| Relative Humidity | ≤100%(Non-Condensing) | ≤100%(Non-Condensing) | |
| Seismic Grade | 8 Class | 8 Class | |
| Applicable Standard | GB 11032 / GB/T 12706 / IEC 60840 / GB/T 11022 | Same as left |
Model Code Description
| Model Code | Meaning |
|---|---|
| JY | Product Series Code |
| HY5WZ | Surge Arrester , HY Composite Housing, 5 NominalDischargeCurrent 5kA, W Gapless, Z Station-Type |
| 42/120 | 42kV Surge ArresterRatedVoltage, 120kV NominalDischargeCurrentat Residual Voltage, 10kV System |
| 51/134 | 51kV Surge ArresterRatedVoltage, 134kV NominalDischargeCurrentat Residual Voltage, 35kV System |
| Inner cone plug lightning arrester | Surge Arrester, Installation, providing VoltageProtection |
Order information
Before ordering, confirm interface standard, protection degree, and the required quantity according to the project drawings and source specification.