Strain Insulators
A porcelain strain insulator to ANSI 54-3 with a threaded coupling, used in tension strings on overhead transmission and distribution lines. The insulator is designed for mechanical load transfer and electrical isolation in line termination, anchor, and angle tower applications. It is built to ANSI and IEC standard dimensions and electrical ratings.
Products in This Family
Problems This Family Solves
- Tension strings require a mechanical strength that exceeds the maximum working load to prevent failure under ice and wind loading
- Existing strain insulators with mismatched coupling threads cannot be used in rebuild or replacement projects
- Low wet flashover voltage in polluted environments increases the risk of flashover during rain or fog
- Polymer strain insulators degrade under UV exposure and cannot be visually inspected for internal damage
- Standard insulators do not support non-standard mechanical or electrical requirements in unique line configurations
Who Specifies These
- Utility procurement engineers specifying strain insulators for new transmission line builds
- EPC contractors sourcing strain hardware for anchor and termination towers
- Transmission line contractors installing tension strings at line ends or direction changes
- Substation builders requiring strain insulators for busbar or equipment termination
- Electrical wholesalers supplying strain insulators to regional line contractors
Where They Are Used
- Tension strings at line termination towers on overhead distribution lines
- Anchor towers where the line changes direction and requires high mechanical strength
- Rebuild projects where existing threaded hardware must be matched exactly
- Distribution feeders in moderate pollution zones where extended leakage distance is needed
- Substation busbar terminations requiring strain insulators with high tensile strength
What You Get With Huahao
- Threaded coupling ensures secure mechanical connection without loose parts or additional fasteners
- Tensile strength of 20,000 pounds (91kN) provides a 2:1 safety margin over the maximum working load
- 57mm leakage distance per unit supports string design for moderate pollution levels
- Low frequency wet flashover voltage of 18kV ensures reliable performance in damp conditions
- Available for non-standard designs with engineering support to match unique application requirements
Industries Using This Family
Strain Insulators FAQ
What is the tensile strength of the ANSI 54-3 strain insulator
The tensile strength is 20,000 pounds (91kN). This provides a 2:1 safety margin over the maximum working load.
Can you supply a non-standard strain insulator for my project
Yes. We design insulators for specific non-standard applications and our engineers are available to assist you in developing an insulator for your particular application.
What is the wet flashover voltage rating
The low frequency wet flashover voltage is 18kV. This rating applies under standard test conditions and supports performance in damp environments.
What coupling type is used on the insulator
The insulator uses a threaded coupling. Confirm the thread specification in your project drawings before ordering.
What standards does this insulator follow
The insulator is designed to ANSI 54-3 and other international standards including GB, BS, DIN, AS, and IEC. We build to standard dimensions and electrical ratings.
Do you perform proof testing on every unit
Every unit is manufactured under an ISO 9001:2008 certified quality system. Proof testing is not specified in the product facts.
What is the minimum order quantity
MOQ depends on the ANSI class and glaze colour. Email us with the class and quantity you need and we will confirm.
Get Figures for Strain Insulators
Every class in this family is published with its full mechanical and electrical values. Tell us the class and quantity and we will quote against them.