Spool Insulators
A porcelain spool insulator to ANSI 53-2 with a cylindrical body and metal cap, used in overhead transmission and distribution lines and in substation equipment. The insulator provides electrical isolation between conductors and grounded structures. It is designed for use in moderate voltage applications where mechanical strength and electrical performance are required in a compact form. The body is glazed porcelain with a metal cap cemented at the top. It is built to ANSI standard dimensions and electrical ratings.
Products in This Family
Problems This Family Solves
- Existing insulators in the field have insufficient transverse strength for high wind or ice loading conditions
- Wet flashover performance is inadequate in coastal or high humidity environments
- Mechanical failure occurs when the insulator is subjected to lateral forces from conductor swing
- Lack of standard spool insulators with consistent electrical ratings for replacement in older substations
- Difficulty finding a compact insulator that meets ANSI 53-2 dimensions and electrical values for retrofitting
Who Specifies These
- Utility procurement engineers specifying insulators for substation busbar or switchgear applications
- EPC contractors installing overhead lines with ANSI 53-2 compliant hardware
- Transmission and distribution line contractors replacing insulators in existing structures
- Substation builders requiring compact, standardized insulators for indoor or outdoor switchgear
- Electrical wholesalers supplying ANSI 53-2 spool insulators to regional markets
Where They Are Used
- Substation busbar insulation where compact, high-strength insulators are needed
- Overhead line applications with moderate voltage and high mechanical load from conductor swing
- Retrofitting older substations with ANSI 53-2 compliant spool insulators
- Switchgear installations requiring a standardized insulator with known electrical and mechanical ratings
- Replacement of damaged or degraded insulators in existing structures where ANSI 53-2 dimensions are required
What You Get With Huahao
- Transverse strength of 3,000 pounds (13.6kN) supports lateral loads from wind and ice
- Low frequency dry flashover voltage of 25kV provides reliable insulation under dry conditions
- Wet flashover voltage of 15kV in horizontal orientation supports performance in wet environments
- ANSI 53-2 dimensions ensure compatibility with existing tower and switchgear hardware
- Glazed porcelain body resists tracking and erosion from corona and UV exposure
- Cemented metal cap provides a secure mechanical and electrical connection
Industries Using This Family
Spool Insulators FAQ
What is the transverse strength of the ANSI 53-2 spool insulator
The transverse strength is 3,000 pounds (13.6kN), which is the maximum lateral load the insulator can withstand without mechanical failure.
What is the wet flashover voltage in horizontal orientation
The low frequency wet flashover voltage in horizontal orientation is 15kV, which is the minimum voltage at which flashover occurs under wet conditions.
Can you supply spool insulators with a different glaze colour
Yes. Glaze colour can be customized to suit the utility specification. Contact us with your preferred colour and quantity.
Do you offer non-standard designs for special applications
Yes. We design insulators for specific non-standard applications. Our engineers are available to assist in developing an insulator for your particular requirement.
What standards does this insulator follow
The insulator is designed to ANSI 53-2 dimensions and electrical values. We also support GB, BS, DIN, AS, and IEC standard designs.
What certification do you hold
Our manufacturing facilities are certified to ISO 9001:2008. We do not claim any other certification on this page.
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 Spool 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.