Product Overview
The ZJ-10Q series post insulators are epoxy resin cast-type insulating supports designed specifically for 10 kV and below medium-voltage power distribution systems. Manufactured through integral molding with high-quality epoxy resin, these insulators provide excellent electrical insulation performance, mechanical strength, and weather resistance. They are widely used in high-voltage switchgear cabinets, ring main units, pad-mounted substations, and other power equipment to provide electrical isolation and mechanical support between live components and grounded components.
Model Designation
Product Features
Superior Electrical Performance
Integrally cast using high-purity epoxy resin, free of voids and cracks, with high dielectric strength capable of withstanding the rated voltage of 10 kV systems on a long-term basis, and strong resistance to lightning impulse and switching overvoltages.
Large surface creepage distance with a well-designed shed profile effectively enhances anti-pollution flashover performance, meeting insulation requirements under complex operating conditions.
Low dielectric loss, stable permittivity, and no partial discharge risk, ensuring safe operation of the power system.
High Mechanical Strength
Integrally formed monolithic structure provides excellent resistance to bending, compression, and torsion, capable of withstanding the mechanical loads imposed by busbars and contacts within switchgear, with no deformation or fracture during long-term operation.
Flat mounting surfaces at both ends, with pre-embedded metal inserts (copper) firmly bonded to the epoxy resin, ensuring reliable connections with vibration and shock resistance that meets the operational requirements of power equipment.
Strong Environmental Adaptability
Epoxy resin material offers excellent resistance to aging, ozone, and chemical corrosion, enabling stable long-term operation in indoor humid and dusty environments.
Outstanding flame retardancy compliant with GB/T 20622 and other national standards — non-ignitable and non-combustible upon contact with open flame, enhancing fire safety of the equipment.
Standard epoxy resin red finish with a uniform smooth surface free of burrs and defects, combining aesthetic appeal with practicality.
Convenient Installation
Standardized dimensional design with pre-drilled mounting holes at both ends, compatible with universal 10 kV switchgear mounting standards, enabling direct replacement of traditional porcelain insulators of the same specification.
Multiple height options available to meet design requirements for different cabinet types and electrical clearances, offering strong adaptability.
Technical Parameters
Core Electrical Parameters
| Parameter | Specification |
|---|---|
| Rated Voltage (Un) | 10 kV |
| Maximum Operating Voltage (Um) | 12 kV |
| Rated Lightning Impulse Withstand Voltage (Peak) | 75 kV |
| Rated Power Frequency Withstand Voltage (r.m.s., 1 min) | 42 kV |
| Partial Discharge Level | ≤5 pC (at 1.1Um/√3) |
| Creepage Distance | ≥230 mm (meeting anti-pollution flashover requirements for 10 kV systems) |
| Dielectric Strength | ≥20 kV/mm |
| Dielectric Dissipation Factor (tan δ) | ≤0.005 (power frequency, 20°C) |
Mechanical Parameters
| Parameter | Specification |
|---|---|
| Rated Cantilever Failing Load | ≥8 kN |
| Rated Tensile Failing Load | ≥10 kN |
| Rated Compressive Failing Load | ≥20 kN |
| Body Diameter | 85 mm |
| Available Total Height Options | 140 mm, 145 mm, 150 mm, 160 mm, 170 mm |
| Top and Bottom Mounting Face Diameter | 85 mm (same as body diameter) |
| Pre-embedded Insert Specification | Standard M8/M10 copper inserts (customizable) |
| Number of Mounting Holes | 3 (evenly distributed, customizable) |
Material and Environmental Parameters
| Parameter | Specification |
|---|---|
| Body Material | Epoxy resin (EP) with inorganic filler |
| Insert Material | Brass (tin-plated/nickel-plated, corrosion-resistant) |
| Operating Temperature Range | -40°C ~ +70°C |
| Relative Humidity | ≤95% (at 25°C) |
| Altitude | ≤1000 m (high-altitude versions available on request) |
| Flame Retardancy Rating | V-0 (per UL 94) |
| Applicable Standards | GB/T 20622-2006 Insulators — Epoxy Resin Cast Insulating Posts; DL/T 593-2016 Common Technical Requirements for Standards of High-Voltage Switchgear and Controlgear |
Scope of Application
Applicable voltage class: Indoor medium-voltage power distribution systems at 10 kV (12 kV) and below.
Applicable equipment types:
Armored withdrawable AC metal-enclosed switchgear (KYN28, KYN61, etc.);
Ring main units, pad-mounted substations (box-type substations), and gas-insulated switchgear;
High-voltage distribution cabinets, busbar bridges, disconnecting switches, earthing switches, and other power equipment.
Applicable installations: Indoor substations, distribution rooms, industrial and mining enterprise distribution facilities, and renewable energy power station (photovoltaic, wind power) distribution systems.
Operating Conditions
Normal Operating Conditions
Ambient temperature: -40°C ~ +70°C, with a daily average temperature not exceeding +35°C.
Altitude: Not exceeding 1000 m.
Ambient humidity: Relative humidity not exceeding 95% (at 25°C), non-condensing.
Installation site: Indoor, free of severe vibration and shock, heavy pollution, corrosive gases, and flammable or explosive substances.
Installation orientation: Vertical mounting (allowable deviation ≤5°).
Special Operating Conditions (Customization Required)
Altitude exceeding 1000 m: Altitude correction required per GB/T 11022; high-altitude special-purpose version to be ordered.
Ambient temperature outside the range of -40°C ~ +70°C.
Severely polluted environments (e.g., coastal or chemical industrial areas): Anti-pollution type with extended creepage distance required.
High vibration and high shock conditions: Heavy-duty reinforced structural version required.
Installation and Maintenance
Installation Requirements
Before installation, inspect the product for cracks, damage, voids, and deformation, and verify that inserts are secure.
Following switchgear design drawings, use appropriately sized bolts (M8/M10) to mount the insulator vertically at the designated location; bolt torque shall conform to design requirements (recommended: 8–12 N·m).
Avoid striking or impacting the insulator during installation to prevent damage to the sheds or body.
Ensure reliable electrical connections at both ends of the insulator with adequate contact and no loose connections.
Maintenance Requirements
Routine inspection: Check the insulator surface for dust accumulation, moisture, discharge marks, cracks, and damage.
Cleaning: Wipe surface contamination with a dry soft cloth; the use of organic solvents or corrosive cleaning agents is strictly prohibited.
Periodic testing: Conduct insulation resistance and power frequency withstand voltage measurements in conjunction with switchgear preventive testing to verify performance compliance.
Replacement: If cracks, damage, or discharge/arcing defects are identified, the insulator shall be replaced immediately after de-energization.
Selection Guide
| Model | Total Height (mm) | Recommended Application |
|---|---|---|
| ZJ-10Q φ85×140 | 140 | Compact switchgear with smaller busbar spacing |
| ZJ-10Q φ85×145 | 145 | Standard general-purpose 10 kV armored switchgear |
| ZJ-10Q φ85×150 | 150 | Standard switchgear, general applications |
| ZJ-10Q φ85×160 | 160 | High-current cabinet types with heavier busbar loads |
| ZJ-10Q φ85×170 | 170 | High-altitude or polluted environments requiring increased electrical clearance |
Packaging, Transportation, and Storage
Packaging: Products are individually packaged in carton boxes with foam cushioning to prevent collision damage during transit.
Transportation: Protect from rain, direct sunlight, and severe vibration during transport; throwing and stacking under heavy loads is strictly prohibited.
Storage: Store in dry, well-ventilated indoor facilities free of corrosive gases, away from ignition and heat sources; stacking height shall not exceed 1.5 m to prevent long-term deformation under load.
Quality Assurance
This product is manufactured strictly in accordance with national and industry standards. Each unit undergoes comprehensive electrical and mechanical performance testing prior to shipment, and product quality conforms to GB/T 20622-2006 and other applicable standards. A quality warranty period of 18 months from the date of shipment is provided. Under normal operating conditions, any product quality defects will be remedied by free repair or replacement.
Precautions
This product is designed for indoor use only; direct use in outdoor exposed environments is strictly prohibited.
Operation beyond rated voltage or mechanical load limits is strictly prohibited.
All installation and maintenance work must be carried out in a de-energized state in compliance with electrical safety work regulations.
Customization services are available for special model or specification requirements.
Appendix: Product Outline Diagram
| Model Designation | Description |
|---|---|
| ZJ | Post insulator (epoxy resin cast type) |
| 10 | Rated voltage class: 10 kV |
| Q | Fully insulated, indoor type |
| φ85 | Insulator body diameter: 85 mm |
| ×140/145/150/160/170 | Available total height options (unit: mm) |
Product Images
Order information
Before ordering, confirm model, rated voltage, rated current, installation dimensions, interface type, accessory requirements, and the required quantity according to the project drawings and source specification.