A stay insulator, also called a stay type insulator or egg insulator, is a low voltage insulator that fastens and counterweights dead-end poles by connecting with stay wires or guy grips. Its primary function is to prevent accidental electric conduction on stay wires, particularly when wires break or poles fall. Installed in the middle of stay wires, the insulator ensures the lower conductor portion remains voltage-free during pole failure, mitigating electrical hazards and enhancing system safety.
Stay insulators are manufactured from glazed porcelain produced through wet processes, complying with standards such as British Standard (BS) 137. Porcelain provides high mechanical strength to handle conductor weight and tension, high dielectric strength to withstand voltage stress, and non-porous characteristics that resist moisture absorption. The material also resists temperature fluctuations, chemical exposure, and Ultraviolet (UV) radiation, ensuring consistent performance without degradation.
Technical specifications include voltage ratings of 11kV and 33kV, tensile strength values from 44kN to 222kN, creepage distances from 41mm to 95mm, dry flashover voltages up to 40kV, and wet flashover voltages around 22kV for standard 11kV units. Operational temperature ranges span -50°C to +100°C, with capability to function in high humidity or wet conditions without flashover issues.
Stay Insulator Manufacturer – Premium Porcelain Insulating Solutions
With an objective to meet ever-evolving demands of customers, RaxPower is engaged in manufacturing and supplying a wide range of Stay Insulator to our prestigious clients. Our Stay Insulators are high-performance insulating components made from premium wet process porcelain, which is selected for its excellent physical and chemical properties. This choice ensures high electrical insulation resistance, superior mechanical strength to withstand heavy loads, and durability in harsh environmental conditions. The porcelain material is non-porous, allowing it to shed water and resist dirt accumulation, which prevents electrical leakage and ensures long-term reliability in diverse climates from -50°C to +100°C. Designed with optimized profiles and solid cores, these insulators provide uniform stress distribution and are suitable for use in distribution and transmission lines where high mechanical and electrical stresses are present.
As a leading manufacturer of power line insulators based in Hebei Province, China, RaxPower has 21 years of experience in the industry. We offer comprehensive support on design, fabrication, evaluation, and installation, ensuring that each Stay Insulator meets the highest industry standards.
Our manufacturing processes include advanced techniques, and all products undergo rigorous testing, such as load tests and flashover tests, to verify performance and safety. With a team of over 170 employees, including professional technicians and engineers, and state-of-the-art facilities covering 17,000 square meters of production workshops, we are committed to delivering top-notch products at competitive prices.
Our strict quality control measures, including raw material selection and multi-stage testing with 100% review before packing, guarantee that every insulator is reliable and cost-effective for your specific needs, available in various voltage ratings from 400V to 33kV.
Contact us today to learn more about our products and how we can meet your specific insulator needs.
| Model | Voltage (kV) | Creepage Distance (mm) | Tensile Strength (kN) | Dry Flashover Voltage (kV) | Wet Flashover Voltage (kV) | Material | Standards |
|---|---|---|---|---|---|---|---|
| ANSI 54-1 | 1.1 | 41 | 44 | 25 | 12 | Porcelain | BS137 |
| ANSI 54-2 | 1.1 | 47 | 53 | 30 | 15 | Porcelain | BS137 |
| ASI11 | 11 | 57 | 88 | 27 | 13 | Porcelain | BS137 |
| Standard 11kV | 11 | 80 | 90 | 40 | 22 | Porcelain | BS137 |
| ANSI 54-3 | 11 | 57 | 89 | 35 | 18 | Porcelain | BS137 |
| ANSI 54-4 | 15 | 76 | 89 | 40 | 23 | Porcelain | BS137 |
| ASI33 | 33 | 95 | 110 | 45 | 20 | Porcelain | BS137 |
| ANSI GY-3 | 20 | 118 | 222 | 50 | 35 | Porcelain | BS137 |
Frequently Asked Questions (FAQS)
What is a stay insulator and how does it work?
A stay insulator is a low voltage insulator designed to fasten and counterweight dead-end poles by connecting with stay wire or guy grip. Also called a stay type or egg insulator, it has two holes through which guy grips pass in opposite directions, wrapping the stay wire to create a secure connection. It prevents electric conduction on the stay wire by accident, and in the event of pole or tower collapse, ensures wires remain fully insulated, preventing voltage from reaching the ground.
What are the key advantages of using stay insulators?
Stay insulators offer safety by preventing accidental electric conduction, stability by securing dead-end poles, versatility for different voltage networks, durability with glazed porcelain construction, flexible connection with two holes, and customization options. RaxPower stay insulators are free from defects, have smooth surfaces, and are made with non-porous properties for long-term performance.
What materials and standards are used in manufacturing?
Stay insulators are made from glazed porcelain according to BS137 standards. Porcelain is chosen for its physical and mechanical strength, high insulation resistance, high dielectric strength, non-porous nature, resistance to temperature changes, and non-reactivity to chemicals. Our products are also designed to meet international requirements including IEC and ANSI, with properties like tensile strength, creepage distance, and flashover voltages verified through testing.
What voltage ratings are available?
Stay insulators are available for various voltage levels, including 11kV and 33kV. RaxPower offers stay insulators for 11kV overhead line networks, with normal system voltage of 11kV and system highest voltage of 12.5kV, providing reliable insulation and mechanical support for medium and low voltage applications.
How are stay insulators installed?
Stay insulators are typically installed in the middle of stay wires by threading the stay wire through one hole and exiting through the other, with guy grips providing a secure connection. Connection methods can vary by market, and RaxPower can design custom insulator fittings based on customer designs and drawings for flexible installation.
What quality control and customization options are available?
Our stay insulators are made from high-quality porcelain that is thoroughly vitrified and non-porous, free from defects and blemishes. They are inspected by our QC team to ensure durability and resistance to harsh environmental conditions. We can design insulator fittings based on your designs and drawings to meet specific project requirements, ensuring perfect integration with your application specifications.
How do you handle large volume orders and what affects pricing?
We have adequate resources and production capacity to supply large orders efficiently, with streamlined processes enabling consistent supply and timely delivery. Our manufacturing facilities and warehousing support bulk orders for large-scale projects without compromising quality or schedule. Pricing depends on factors such as physical, mechanical, and electrical properties, and voltage rating. Contact RaxPower directly for a quote based on your specific requirements.
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