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Help CenterSuspension Porcelain Insulator for 10kv Transmission Line, Anti-pollution and Anti-flashover Ceramic Insulator
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In the operation of power transmission and distribution lines, insulator flashover accidents caused by polluted environments have long been a core pain point for operations and maintenance personnel. Pollutants such as industrial dust, salt spray, rain fog, and bird droppings adhere to the surface of insulators. In humid weather, conductive channels form on the surface of the porcelain, significantly increasing leakage current, which then leads to partial arcs that develop into flashovers, resulting in line trips and power supply interruptions. Especially in 10kV distribution networks, where insulators are numerous and the operating environment is complex, ordinary insulators have insufficient creepage distance, unreasonable shed shapes, and limited anti-pollution flashover capability. Frequent power outages for maintenance not only increase maintenance costs but also reduce customer satisfaction with power supply. To fundamentally solve this problem, Hejian Haokang Electric Co., Ltd., based on actual line operating conditions, has developed and produced the suspension porcelain insulator for 10kV anti-pollution and anti-flashover ceramic insulators. This product fully leverages the excellent insulation performance, high-temperature resistance, and anti-aging characteristics of ceramic materials, with targeted optimizations in structural design and surface treatment, dedicated to providing highly reliable insulation solutions for the power grid. As a company long focused on insulator manufacturing, Hejian Haokang Electric Co., Ltd. has accumulated rich experience in electrical porcelain production. Its product line covers suspension, pin, post, bushing and other types, and it can provide customized services according to customer needs, with a strict quality control system ensuring the consistency of every batch of products.
This product adopts a typical suspension insulator structure, mainly consisting of three parts: porcelain, steel cap, and steel foot. The porcelain is made of high-purity alumina clay, feldspar, quartz and other inorganic non-metallic raw materials, processed through dozens of procedures including batching, ball milling, sieving, pugging, forming, drying, glazing, and high-temperature firing. In 10kV lines, suspension insulators are typically used in string form, with individual porcelain insulators connected to adjacent elements through ball-socket coupling mechanisms, forming insulator strings that provide electrical insulation and mechanical fixing of conductors to towers. Its working mechanism can be summarized as: the porcelain provides a high-resistance insulation path to prevent leakage current from passing through; the shed structure increases the surface creepage distance and reduces the electric field strength per unit length; the smooth glazed surface reduces pollutant residue, and combined with the anti-pollution shed design, causes water droplets to form isolated droplets on the surface rather than a continuous water film, thereby significantly increasing the flashover voltage. Compared with ordinary insulators, this anti-pollution and anti-flashover product focuses on optimizing the spacing and shape of the sheds, adding an edge drip-edge design for better rain washing effect, while increasing the creepage distance to effectively suppress surface discharge under polluted and humid conditions.
The main features of the product include:
- Superior anti-pollution flashover performance: through increased creepage distance and special shed structure, it effectively improves the pollution withstand voltage level and is suitable for use in Class II and below polluted areas.
- Reliable mechanical strength: the steel cap and steel foot are made of high-quality carbon steel with hot-dip galvanizing treatment, providing strong corrosion resistance and mechanical load-bearing capacity.
- Good weather resistance: the porcelain is fired at high temperature, with a dense structure that is not easily aged, and can operate stably for a long time within the temperature range of -40℃ to +100℃.
The following table shows the main technical specifications of this product (typical values):
| Parameter Item | Typical Parameter |
| Product Type | Anti-pollution Suspension Porcelain Insulator |
| System Rated Voltage | 10kV |
| Structural Height | 146mm |
| Creepage Distance | ≥400mm |
| Electromechanical Breaking Load | 70kN |
| Connection Type | Ball-and-Socket Type |
| Shed Configuration | Anti-pollution Alternating Large and Small Sheds |
| Material | High-Alumina Ceramic |
In terms of anti-pollution flashover performance, the product extends the creepage distance to over 400mm, significantly lengthening the leakage path on the insulator surface and greatly reducing the leakage current under the same pollution level. The anti-pollution shed structure adopts alternating large and small sheds, which interrupts the formation of continuous water films and enhances self-cleaning capability. The alumina ceramic matrix has high resistivity and low dielectric loss, maintaining stable insulation characteristics even in high-temperature and high-humidity environments. In addition, the porcelain surface features a bright glaze fired at high temperature. The glaze layer is dense and smooth, not prone to dust adhesion, and can be effectively cleansed of contamination by rainwater washing, thereby reducing the frequency of manual cleaning and lowering line operation and maintenance costs. In terms of manufacturing process, Hejian Haokang Electric Co., Ltd. strictly controls the firing temperature and holding time to ensure the porcelain is fully vitrified with no internal pores, guaranteeing both mechanical strength and electrical performance. Before leaving the factory, the products undergo multiple inspections including appearance inspection, dimensional checks, power-frequency withstand voltage tests, and mechanical load tests, ensuring that all indicators meet relevant industry standards. For special positions on 10kV lines such as tension towers and angle towers, it is recommended to use dual strings or parallel connection to improve reliability. For specific installation schemes, please consult the technical personnel of Hejian Haokang Electric Co., Ltd.
To ensure product applicability, the company can supply suspension insulators with different mechanical strength levels and creepage distances according to actual line requirements, such as 40kN, 70kN and other specifications. Based on the pollution area distribution map, altitude and environmental conditions provided by customers, suitable combinations of insulator units can also be recommended. Hejian Haokang Electric Co., Ltd. is located in the North China electric porcelain industrial belt, with a mature supply chain and production lines, capable of fast delivery and large-batch supply. The company also supplies glass insulators, composite insulators, pin insulators, post insulators and many other products, providing one-stop supporting services for power systems. We understand the importance of transmission line safety, so we always adhere to the principle of quality first and implement strict traceability management from raw material incoming to finished product outgoing. Customers at home and abroad are welcome to visit our factory for on-site inspection, and we will provide professional product selection suggestions and supporting solutions according to your specific working conditions. If you need detailed product information or samples, please feel free to contact our sales team, and we will reply as soon as possible.
The principle is mainly to increase the creepage distance on the insulator surface, making the leakage current path longer and making it difficult to form a continuous conductive film under polluted and humid conditions. Meanwhile, the anti-pollution shed structure can break up the water film and enhance self-cleaning. Combined with the smooth glaze surface, it reduces pollutant adhesion, thereby increasing flashover voltage and reducing pollution flashover trips.
10kV lines belong to the medium-voltage distribution network. Generally, the number of suspension insulator discs in a string is related to the line voltage level, tower type and pollution class. In Class 0 or Class I pollution areas, usually 1 to 2 discs are used; in higher pollution areas or in tension strings, the number may need to be increased. The specific number should be calculated and determined by the design institute based on the insulator creepage distance and the pollution area class.
The product uses high-strength porcelain components, hot-dip galvanized steel caps and steel pins, assembled with cement adhesive. After curing, it has stable mechanical strength. Before leaving the factory, sampling tests for electromechanical failing load are carried out according to standards to ensure that the product can withstand mechanical loads such as tension, icing and wind load during line operation.
The product is of anti-pollution design and is suitable for medium pollution areas such as general industrial areas and coastal salt spray areas. Users can select products with appropriate creepage distance according to the local pollution area distribution map. For heavy pollution or special pollution environments, it is recommended to adopt comprehensive solutions such as increasing the number of insulator discs or using composite insulators.
Ceramic insulators have dense materials, good aging resistance, and their mechanical strength declines slowly after long-term operation. They also have excellent resistance to tracking. Their price is relatively stable and they are suitable for clean areas. Glass insulators, on the other hand, have the advantage of easy detection of zero-value self-explosion. The two types have their own applicable ranges; users can choose according to their operating habits.
During transportation, handle with care, avoid chipping porcelain parts and bending steel feet. During installation, use special lifting tools and do not throw directly. The retaining spring pin should be installed properly to ensure reliable connection between the socket and the ball head. Climbing on porcelain surfaces or applying extra external force is strictly prohibited to prevent mechanical damage.
Our company can customize suspension insulators with different creepage distances, mechanical strengths, and connection types according to the drawings or technical parameters provided by customers. We also support production according to special shed shapes and color requirements. It is recommended that customers communicate with our technical department before starting the project so that the design plan can be evaluated and optimized.
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