composite pin insulator

Our pin type composite insulator, also known as composite pin insulator series covering 10kV, 24kV, 33kV, 36kV and 52kV grades, adopts high-strength fiberglass rod and weather-resistant silicone housing for various overhead distribution and transmission power projects.

composite pin insulator

Advantages of Composite Pin Insulators

  • Vertical pin mounting structure, directly fixed on cross arms for overhead distribution lines
  • Integrated top wire slot to clamp power wires without extra fixing parts
  • Compact short rod design, fits narrow urban and factory power corridor spaces
  • Small overall size, suitable for low & medium high voltage distribution network scenes
  • Built-in threaded steel foot base for fast field installation
  • Balanced creepage distance specially optimized for overhead pin-type layout
  • Light single-piece unit, no splicing assembly needed on site
  • Targeted design for distribution lines, unlike long rod composite insulators for transmission towers
  • Small occupied space, ideal for dense urban power grid layout
  • Lower single-unit cost compared with long rod composite insulators

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FAQ
Common questions & answers about composite pin insulator

Special insulating parts for high-voltage overhead distribution lines. Made of FRP core rod, silicone rubber sheath and metal fittings. They have high strength and strong insulation, and run stably in tough environments.

Light weight for easy installation, strong mechanical strength, water-repellent anti-pollution ability and long anti-aging life. Their total maintenance costs are far lower than ceramic insulators.

Temperature from -40℃ to +40℃; altitude within 1000 meters; frequency ≤100Hz; load below rated bending value.

The outer silicone rubber sheath blocks UV rays, rain, salt fog and dust, and keeps stable insulation for years.

Composite materials fight aging well. They run stably for a long time under standard conditions, much longer than traditional ceramic insulators.

Contact Form Demo

Preface

Pin insulators hold overhead power lines. They support wires and block electric leakage. Three main materials make them: ceramic, glass and composite. Composite pin insulators have the best overall performance, so high-voltage lines pick them first. This text mainly talks about composite pin insulators and compares them with old ceramic or glass pin insulators.

1. Basic Concept: Introduction to Pin Insulators

Workers install pin insulators on overhead wires. They hold wires and separate wires from metal poles and frames. They stop electric leakage to the ground and avoid safety accidents. They look like tubes. One end has a flange to fix frames, and the other clamps power wires. Old pin insulators use ceramic or glass. They stand wind, ice and UV rays well.

A full set includes an insulating body, metal steel foot base, wire slot sheds, metal fittings, fixing cement and metal caps. Users can also add equalizing voltage rings.

All Types of Pin Insulators

  1. Standard ceramic / glass pin insulators: Fit low-voltage regular power lines.
  2. Guy strain insulators: Insulate and bear weight for pole stay wires.
  3. Solid ceramic pin insulators: Traditional main products for medium voltage.
  4. Composite pin insulators (focus of this article): Made of fiberglass epoxy, fit coastal and heavily polluted areas.
  5. Multi-section spliced insulators: Easy to take apart and assemble, for low voltage.
  6. Long rod insulators: For high voltage, with longer creepage distance.

Difference Between Pin Insulators and Insulator Steel Feet

  • Pin insulator: Complete insulating unit (insulator body + metal steel foot)
  • Insulator steel foot: Single metal part, only fixes insulators mechanically

Pros and Cons of Traditional Ceramic / Glass Pin Insulators

Advantages

Stable insulation, durable raw materials, easy installation, full sizes, cost-effective.

Disadvantages

Only work for medium and low voltage; dirt and moisture cause leakage current; weak mechanical strength, easy to break; need frequent maintenance at high altitudes or polluted sites; high long-term total costs.

2. Key Section: Full Introduction to Composite Pin Insulators

2.1 Product Definition

Composite pin insulators are key insulating parts for high-voltage overhead power lines. They have three core parts: FRP core rod, silicone rubber sheath and metal end fittings. They beat old ceramic and glass pin insulators in all performance areas.

2.2 Structure and Core Features

  1. High-strength FRP core rod: Offers strong bending resistance and basic insulation.
  2. Outer silicone rubber sheath: Resists UV rays and aging. It repels water and dirt for coastal, dusty and salt fog areas.
  3. Two-end metal fittings
    • Threaded steel foot at the bottom: Locks firmly on cross arms.
    • Wire groove on the top: Clamps power wires tightly for stable connection.

2.3 Working Environment Limits

  • Temperature: -40℃ ~ +40℃
  • Standard altitude: ≤1000m; custom versions for places above 1000m
  • AC frequency: ≤100Hz
  • Mechanical load: Never exceed the rated bending load of the product

2.4 Main Technical Parameters

Product Model
Rated Voltage (kV)
Rated Mechanical Bending Load (KN)
Structure Height (mm)
Insulating Distance (mm)
Min Creepage Distance (mm)
Lightning Impulse Withstand Voltage (peak, kV)
Power Frequency Withstand Voltage (virtual value, kV)
FPQ-10/4T20
10
4
215
125
280
75
FPQ-24/6
24
6
305
255
715
150
75
FPQ-36/8
36
8
440
320
1000
185
95
FPQ-52/12
52
12
480
415
1255
220
110
Note: P.F. = Power Frequency
Note: We customize products to match customers’ voltage, load and altitude needs.

2.5 Four Core Advantages of Composite Pin Insulators

  1. Light and compact, cut construction costs

    They weigh much less than ceramic insulators of the same voltage grade. Transport, carry and install them fast. They save labor and logistics costs.

  2. Excellent mechanical and electrical performance

    The core rod resists bending well. It bears long-term line tension and vibration. It rarely breaks or causes power cuts, so users replace it less often.

  3. Water-repellent and anti-pollution, lower maintenance work

    Silicone rubber naturally repels water. It stops continuous conductive water films and leakage current. Dust and salt fog do not stick easily. Coastal and chemical polluted areas need little cleaning.

  4. Long anti-aging service life

    They resist UV rays and tracking. Their insulation never drops in long wet or sunny conditions, cutting full-life costs.

2.6 Application Scenarios

Made for high-voltage overhead power systems, widely used in:
Application Scene
Specific Usage & Features
High-voltage overhead distribution lines
Support and insulate overhead power wires, stabilize daily power transmission for medium and high-voltage overhead lines.
Urban power distribution networks
Adapt to narrow urban power corridors. The compact pin-type structure saves space for dense urban grid layout.
Factory & industrial power lines
Resist industrial dust and chemical pollution. Ensure safe and stable power supply for factory production lines.
Substation inlet & outlet lines
Serve as fixed insulation supports for substation overhead wiring, prevent electric leakage of power inlet and outlet ends.
Coastal area power grids
Fight salt fog and humid weather. Avoid insulation failure caused by coastal high-salinity environments.
High-altitude power distribution projects
Customizable structure adapts high-altitude low-pressure environments, keep stable insulation performance.
Rural overhead power renovation
Easy to install and maintain. Perfect for rural grid upgrading and daily power guarantee.
Mild polluted area power lines
Self-cleaning and anti-fouling surface reduces manual cleaning work for outdoor overhead lines.

3. Core Comparison: Ceramic Insulators vs Composite Pin Insulators

  1. Material: Solid ceramic for ceramic insulators; FRP core rod + silicone rubber sheath for composite types
  2. Weight: Heavy ceramic; light composite, easier construction
  3. Anti-pollution & water repellent: Ceramic collects dirt and leaks electricity when wet; composite repels water, salt fog and dust
  4. Suitable environments: Ceramic only fits clean inland medium-low voltage sites; composite works for high voltage, coasts, heavy pollution and strong UV areas
  5. Maintenance: Ceramic needs regular cleaning; composite requires almost no maintenance
  6. Mechanical safety: Ceramic cracks easily; composite has good toughness and resists hits

4. Supporting Service Materials

  1. Packaging: Standard export packages
  2. Document download: L&R insulator product catalog
  3. Service channels: Online technical consultation, product demo videos

Summary

Composite pin insulators outperform old ceramic and glass pin insulators in weight, strength, anti-pollution and anti-aging performance. They fit high-voltage, coastal and heavily polluted power lines, cut construction and maintenance costs, and we offer custom designs and full technical support for all power projects.

High Quality

Stable performance, durable structure, ensuring safe operation for power transmission and distribution.

Fast Delivery

Timely dispatch to meet your urgent orders and project schedules efficiently and professionally at any time

Best Warranty

Best Warranty: Reliable after-sales support for long-term product stability and customer satisfaction.