Hebei Anmei Electrical Equipment Co., Ltd. is one of the most reliable manufacturers and suppliers of medium voltage bushings in China, also supports customized service. If you're going to buy high quality medium voltage bushings made in China, welcome to get quotation from our factory.
Medium voltage bushings are critical insulating components in power systems rated from 1kV to 35kV (with international standards extending this range to 52kV in some specifications). These essential devices are widely used in transformers, switchgear, and cable terminations to provide electrical insulation between conductors and grounded components while ensuring mechanical stability and system reliability.
As the global electrical bushing market continues to grow-projected to reach approximately USD 4.88 billion by 2034-understanding the technical characteristics, types, and selection criteria of medium voltage bushings becomes increasingly important for industry professionals worldwide.
Functions and Applications
2.Key Applications：
- Transformers – Connecting transformer windings to external lines
- Switchgear – Isolating compartments and connecting breakers and disconnectors
- Cable Terminations – Ensuring insulation and sealing at cable connection points
3. Structure and Composition
A typical medium voltage bushing consists of the following key components:
| Component | Description |
|---|---|
| Center Conductor | Copper or aluminum rod/cable for current transmission |
| Capacitive Core (Main Insulation) | Multi-layer concentric capacitor structure of insulating paper and aluminum foil for uniform electric field distribution |
| External Insulation | Porcelain or silicon rubber composite housing with sheds to increase creepage distance |
| Oil Conservator/Expander | Compensates for oil volume changes due to temperature variation |
| Flange and Seals | Ensures mounting stability and sealing integrity |
| Grading Ring/Shield |
Improves end-field distribution and reduces partial discharge risk |
4. Industry Standards and Market Trends
International Standards
The recently published IEC TS 63493-1:2025 provides dimensional standardization for medium voltage transformer bushings with Um from 12 kV to 52 kV and Ir from 630 A to 3,150 A. This technical specification facilitates interchangeability between products from different manufacturers and establishes uniform framework conditions for:
Porcelain and polymeric external insulation solutions
Non-capacitance graded bushings for power transformers
Liquid-to-air bushing types (excluding liquid-to-liquid, air-to-air, and air-cushion types)
5. Maintenance and Best Practices
-
Check for cracks, chips, discharge marks on the outer surface
Verify oil level is within normal range
Ensure ground terminal (tap) grounding is intact
-
Electrical Testing
Insulation resistance measurement
Dielectric loss factor (tan δ) testing
Capacitance measurement
-
Anti-Pollution Flashover Measures
Regular cleaning of bushing surfaces in contaminated environments
Application of anti-pollution flashover coatings
Use of silicon rubber sheds for enhanced performance
-
Mechanical Protection
Avoid impact and extrusion during installation and maintenance
Ensure seal integrity to prevent moisture ingress
The company exports to dozens of countries across Asia, the Middle East, South America, and Europe, partnering with renowned domestic enterprises including Shandong Taikai Transformer, Beijing Kerui, Hefei ABB, and others.
With the business philosophy of "quality first, reputation first, service first," Hebei Anmei is committed to creating first-class products, brands, and services, contributing to the global power industry.
Summary
Medium voltage bushings are indispensable components in modern power systems, playing a vital role in electrical insulation, current conduction, mechanical support, and sealing. With the continued expansion of power infrastructure, smart grid deployment, and renewable energy integration, the demand for reliable, high-performance medium voltage bushings continues to grow globally.
When selecting medium voltage bushings, factors such as voltage rating, current capacity, environmental conditions, and applicable standards must be carefully considered. Regular maintenance and testing are essential to ensure long-term reliability and operational safety.
For more information about medium voltage bushing solutions, please contact Hebei Anmei Electrical Equipment Co., Ltd.
https://www.anmeibushing.com/transformer-bushing/epoxy-bushing/
Hot Tags: medium voltage bushings, China medium voltage bushings manufacturers, suppliers, factory, transformer cable bushing
