Product Overview
Transformer bushings provide critical electrical insulation and mechanical support for live conductors passing through grounded steel enclosures. This line includes Resin-Impregnated Paper (RIP), Oil-Impregnated Paper (OIP), and solid porcelain units built for transmission networks and heavy industrial substations. Each assembly controls the high electrical stress gradient between the high-potential central conductor and the grounded mounting flange, preventing flashovers under continuous load and transient fault conditions.
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![LV Insulating Epoxy Bushing]()
LV Insulating Epoxy BushingApplication: Box-type distribution transformerview more
Original: Hebei, China
Certification: ISO9001 , ISO14001,etc.
Price: Negotiable
Material: Copper,Epoxy
Current: 630A~9800A -
![Bushing with Epoxy]()
Bushing with EpoxyRated voltage:2.5kVview more
Rated current:5200A
Power frequency withstandvoltage:12kV/1min
Lightning impulse:45kV
Cantilever tolerance:3150N
Creepage distance:≥61mm -
![ANSI Standard Bushing]()
ANSI Standard BushingMaterial: wet process porcelain insulatorview more
Glaze color: light gray
Rated voltage: 15-38KV
Rated current: 55A
Standard: ANSI -
![ANSI Standard Transformer Bushing]()
ANSI Standard Transformer BushingProduct Type: Transformer Bushingview more
Product Application: Distribution Transformer
Voltage Level: 1.2kV
Model: Customized according to requirements
Color: White
Quality: Premium Grade
Standard:... -
![Low-Voltage Aluminum Flange Porcelain Bushing]()
Low-Voltage Aluminum Flange Porcelain BushingProduct Type: Transformer Bushing Product Application: Distribution Transformer Voltage Rating: 1kV Model: Adapted to Customer Requirements Process: Aluminum Flange Installation Quality: Superior Grade Standard: Fully...view more -
![Low Voltage DIN Bushing]()
Low Voltage DIN BushingProducts Description Low Voltage DIN Bushing is a core insulating and conductive component specially developed and manufactured in full compliance with German DIN42530 industrial standards, which is widely recognized as the standard...view more -
![DIN 42532]()
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![ANSI Bushing]()
ANSI BushingANSI standard bushings are electrical insulating components manufactured in accordance with American National Standards Institute (ANSI) specifications, primarily used for lead insulation and conductive lead-out in oil-immersed...view more -
![Resin Insulated Bushing]()
Resin Insulated BushingResin Insulated Bushing represents the culmination of over four decades of evolution in high-voltage insulation technology, transitioning from oil-impregnated paper and porcelain structures to advanced solid epoxy systems that offer...view more -
![ANSI Transformer Bushing]()
ANSI Transformer BushingThe Evolution of Transformer Bushings Transformer bushings have been a critical component in power transmission since the dawn of the electrical age.Historically, bushings evolved from simple porcelain insulators to sophisticated...view more -
![Transformer Secondary Bushing]()
Transformer Secondary BushingTransformer secondary bushings are critical low-voltage interface components for distribution and power transformers. This page covers YF-SB series models, specifications, and selection guidance.view more -
![Plug in Epoxy Bushing]()
Plug in Epoxy BushingHebei Anmei Electrical Equipment Co., Ltd. specializes in plug-in epoxy bushings for GIS/AIS transitions, transformer direct plug connections, and SF₆ cable terminations. Using high-purity cycloaliphatic epoxy resin and vacuum casting,...view more
Product Types, Construction, & Working Principle
Resin-Impregnated Paper (RIP)
Wound with crepe paper and vacuum-impregnated with epoxy resin under thermal control. Features a dry, void-free condenser core with embedded capacitive grading foils for radial and axial electric field distribution.
Oil-Impregnated Paper (OIP)
Condenser core wound with kraft paper, dried under deep vacuum, and impregnated with degassed mineral oil inside a sealed porcelain or composite housing.
Working Principle
Condenser-graded bushings utilize coaxial conductive foil inserts within the insulation matrix to linearize capacitance and shape electric field lines, preventing localized high-stress concentrations at the mounting flange interface.
Capacitive test tap integrated into the mounting flange for routine measurement of capacitance (C1) and dielectric dissipation factor (tan delta).
Partial discharge inception levels operating below 5 pC at 1.5 * Um / sqrt(3) to minimize insulation aging.
Seismic-resistant porcelain or silicone composite outer housings engineered to withstand cantilever loads up to 5000 N.
Hermetically sealed construction preventing moisture ingress across operating temperatures from -50 degrees C to +50 degrees C.
Interchangeable lower terminal configurations (draw-lead or bottom-connected studs) matching existing transformer leads.
Technical Specifications
|
Parameter |
Standard Range |
Test Standard |
|
Rated Voltage (Um) |
24 kV - 550 kV |
IEC 60137 / IEEE Std 693 |
|
Rated Current (Ir) |
Up to 4000 A |
IEC 60137 |
|
Basic Insulation Level (BIL) |
Up to 1425 kV peak |
IEC 60060 / IEEE Std 4 |
|
Partial Discharge at 1.5 * Um / sqrt(3) |
< 5 pC (RIP/OIP) |
IEC 60137 |
|
Dissipation Factor (tan delta) |
< 0.003 (20 degrees C to 90 degrees C) |
IEC 60137 |
|
Creepage Distance |
Class III (25 mm/kV) to Class IV (31 mm/kV) |
IEC 60815 |
|
Housing Material |
C130 Electrical Porcelain / Silicone Composite (HTV) |
IEC 60672 / IEC 61462 |
Transmission Substations: Interfacing auto-transformers and step-up transformers (110 kV - 500 kV) in regional grid nodes.
Renewable Energy Integration: Connecting utility-scale solar and wind farm step-up transformers (35 kV - 220 kV) exposed to heavy coastal or desert pollution.
Industrial Manufacturing: Supplying high-current furnace transformers requiring robust thermal dissipation.
Hydro/Thermal Power Plants: Managing continuous load currents in generator step-up (GSU) transformer installations.
Manufacturing & Quality Control
Winding & Drying
Condenser cores are wound on automated CNC tension-controlled machines, followed by vacuum drying chambers operating below 0.1 mbar for 72 hours to maintain moisture content under 0.5 ppm.
Resin Processing
RIP cores are impregnated under controlled vacuum using formulated epoxy resin systems to eliminate internal micro-voids.
Testing Facilities
Production units undergo routine and type testing in an in-house high-voltage laboratory featuring:
800 kV shielded test hall for power-frequency withstand tests.
Partial discharge detection systems with a background noise floor < 1 pC.
Schering bridge instrumentation for precise tan delta and capacitance validation.
Compliance Standards
Manufactured under quality management systems meeting ISO 9001, ISO 14001, and ISO 45001 standards, with design type tests validated in accordance with international laboratory frameworks.
Customization
Dimensional Retrofitting
Flange bolt-circle diameters, PCD, and mounting hole layouts custom-matched to replace legacy bushings on installed transformers without tank modifications.
Creepage Optimization
Tailored porcelain shed profiles or extended silicone composite shed counts for high-pollution environments.
Current & Voltage Adaptation
Customized copper conductor cross-sections and test tap wiring to meet regional utility grid monitoring protocols.
Hebei Anmei Electrical Equipment Co., Ltd. is one of the most professional transformer bushing manufacturers and suppliers in China, specialized in providing high quality products and service. Please feel free to buy customized transformer bushing made in China here from our factory. Contact us for quotation.
transformer cable bushing
