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Help CenterOutdoor Porcelain Post Insulator, 110kv, Anti-pollution, for Power Station, High Mechanical Strength, Customizable Flange.
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Industry Pain Points and Solutions
In outdoor substations and transmission lines, post insulators are exposed to harsh environments such as rain, snow, salt spray, and industrial dust for long periods. Accumulated contamination can easily cause flashover accidents, seriously threatening grid safety. Meanwhile, operating impacts from equipment such as circuit breakers and disconnectors, as well as external forces such as wind loads and earthquakes, require insulators to have sufficient mechanical strength to avoid fracture failure. Traditional insulators often fail to balance anti-contamination performance and mechanical load-bearing capacity due to inadequate material formulations or structural design. To address the above pain points, Hejian Haokang Electric Co., Ltd., with years of deep involvement in the insulator field, has launched this outdoor post insulator, porcelain, 110kV, anti-contamination, for power station use, high mechanical strength, customizable flange product, relying on mature high-alumina electrical porcelain formulas and advanced molding processes. Through optimizing the particle size distribution of the clay body and adopting isostatic pressing technology, the porcelain body is densified, significantly improving pollution flashover resistance. Meanwhile, the ratio of shed profile to body diameter is increased, enabling the mechanical failing load to consistently reach above 4kN. The company implements full-process quality control from raw material inspection to finished product testing, ensuring that every insulator meets the GB/T 8287 standard and providing reliable support for the safe operation of power stations.
Working Mechanism and Core Technical Features
This insulator serves as the external insulation and mechanical support component of electrical equipment in power stations. Its working principle is that the excellent insulating performance of the porcelain body itself can withstand the rated voltage of the 110kV system and various overvoltages; the shed structure effectively extends the creepage distance and enhances pollution withstand capability; the metal fittings are firmly bonded to the porcelain body with cement grout, uniformly transmitting mechanical loads to the flange base. The specific features are as follows:
- High anti-contamination design: A structure with alternating large and small sheds is adopted, providing a specific creepage distance of no less than 25mm/kV (Class III anti-pollution), strong self-cleaning performance, and reduced manual cleaning frequency.
- Superior mechanical performance: The porcelain body has a bending failing load of ≥4kN and a tensile failing load of ≥60kN, enabling it to withstand circuit breaker switching impacts and conductor tension.
- Customizable flange: The flange is made of hot-dip galvanized cast iron or ductile cast iron. The mounting hole spacing, hole diameter, and flange thickness can be customized according to user requirements, and the flange is compatible with standards such as EN, DIN, and GB.
- High-reliability assembly: Early-strength cement grout is used. After 48 hours of constant-temperature curing, the fittings are not prone to loosening; the interface is coated with a moisture-proof sealant to retard aging.
- Excellent weather resistanceThe porcelain body is finished with a high-gloss brown or gray glaze, resistant to UV rays and sudden temperature changes (-40℃～+50℃), with a service life of over 20 years.
| Item | Technical Parameter |
| Rated Voltage (kV) | 110 |
| Maximum Operating Voltage (kV) | 126 |
| Creepage Distance (mm) | ≥3150 |
| Bending Failure Load (kN) | ≥4.0 |
| Torsional Failure Load (kN·m) | ≥2.0 |
| Lightning Impulse Withstand Voltage (kV) | 480 |
| Power Frequency Wet Withstand Voltage (kV) | 265 |
| Flange Mounting Hole Spacing (mm) | Customizable (commonly 250/300) |
Trust Endorsement and Consultation Suggestions
Since its establishment, Hejian Haokang Electric Co., Ltd. has provided various types of insulator products to hundreds of substations at home and abroad, with cumulative shipments exceeding 500,000 units. This 110kV porcelain post insulator has passed all type tests at third-party testing institutions, including thermo-mechanical tests, porosity tests, bending failure tests, etc. We insist on using only high-quality kaolin, feldspar, alumina and other raw materials to ensure a dense, pore-free porcelain body from the source; we retain test samples from each batch and issue certificates of conformity. If you need:
• Insulator selection for new construction or renovation of substations/switching stations;
• Optimized solutions for specific pollution levels (such as Class III, Class IV);
• Non-standard customization of flange dimensions and metal fitting materials;
please contact our technical sales engineers directly. We will provide you with free professional support such as creepage distance calculation, mechanical load verification, and installation suggestions to ensure worry-free operation of your substation.
FAQ Frequently Asked Questions
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Q: How does your company's product ensure anti-pollution flashover capability at 110kV?
A: The product is designed to meet Class III anti-pollution requirements, with a creepage distance ratio of not less than 25mm/kV and an actual creepage distance of ≥3150mm. It also adopts a large-and-small shed structure to reduce contamination bridging and is verified by flashover tests. Users can select the corresponding shed profile according to the site pollution level, and we can provide selection suggestions for the creepage ratio. -
Q: Does the mechanical strength of 4kN meet actual working conditions?
A: The 4kN bending load is the minimum value required by the standard; the actual failure value of the product is usually 10% to 20% higher. For conventional circuit breakers, disconnectors, and conductor tension, this strength is fully sufficient. If higher loads are required (e.g., heavy icing areas), we can customize a 6kN bending specification, which needs to be communicated in advance. -
Q: What does flange customization specifically include?
A: The flange material (hot-dip galvanized cast iron/stainless steel), number of mounting holes (4/6/8 holes), hole diameter, hole spacing, and flange thickness can be customized. Please provide the mounting plate drawing or detailed dimensions, and we can provide a free drawing for confirmation. -
Q: What advantages do porcelain insulators have over composite insulators?
A: Porcelain insulators offer unparalleled aging resistance, UV resistance, and arc resistance, with long-term stable mechanical strength, and their surface glaze is not prone to contamination accumulation. Although composite insulators are lighter, they carry risks of core rod brittle fracture and interface breakdown; porcelain insulators are more reliable in substation applications. -
Q: What are the service life and maintenance requirements of the product?
A: The design service life is not less than 20 years under normal environments (without severe corrosion). It is recommended to perform visual inspection and insulation resistance testing every 3 to 5 years. If glaze damage or metal fitting corrosion is found, timely replacement or repair should be carried out. Hejian Haokang Electric Co., Ltd. provides the instruction manual and on-site inspection guidance. -
Q: What are the delivery time and packaging method?
A: Conventional specifications are stocked; shipment can be made in 15-20 days after ordering (quantity ≤100 pieces). Wooden cases or steel frames are used for packaging, with each insulator individually isolated and lined with cushioning material to ensure safe transportation. Customized flange products have a delivery time of about 25-30 days. -
Q: Are relevant type test reports available?
A: We can provide a complete type test report issued by a CNAS-accredited laboratory, covering bending, tensile, thermal-mechanical, porosity, lightning impulse, and power-frequency withstand voltage tests, with authentic and verifiable data.
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