Technical GuideSeries 01 · OIP & RIP Bushings
OIP or RIP Transformer Bushing: What Should Buyers Check?
Compare oil and dry-core construction, mounting, maintenance and model-specific IEC 60137 test evidence before choosing a transformer bushing.
RPC52kV ～ 800kV
Review model drawings and test evidence
RIP Bushing Cores
RIP Bushing Core
Key functional capacitive grading core determining dielectric performance and long-term reliability of 52kV-800kV RIP bushings
Rated Voltage52kV ～ 800kV
Rated CurrentCustom / 630A ～ 5000A
Insulation TypeResin-Impregnated Paper (RIP) / Capacitive Graded
Catalog standardIEC 60137 / IEEE C57.19.01 / GB/T 4109
PD requirementConfirm by model
Test evidenceRequest with RFQ
Buyer requirement checklist
Define the core as an engineered subcomponent with its own interface and acceptance plan.
- Core envelope, conductor and terminal interface drawing
- Voltage/current and condenser grading requirements
- Impregnation, insulation and thermal requirements
- Core-level tests and complete-bushing integration plan
IEC 60137 covers complete AC bushings, not standalone RIP cores; agree core acceptance tests separately.
Product Technical Overview
The RIP Bushing Core is the key functional component of a Resin-Impregnated Paper (RIP) bushing, forming the core insulation structure that determines its dielectric performance and long-term operational reliability.
Manufacturing a high-performance RIP bushing core requires precise engineering design and strict process control throughout the production process. The design of the insulating paper layers and capacitive grading structure must be carefully controlled to achieve the required electric field distribution. Meanwhile, the resin impregnation and curing processes demand consistent material quality, precise process parameters, and effective control of potential defects to ensure uniform insulation performance and structural integrity.
Due to the complexity of its design and manufacturing process, the RIP bushing core is much more than a simple insulation component. It is a critical element that directly influences the electrical performance, reliability, and service life of the complete bushing.
Key Features:
• Core insulation component of RIP bushings
• Precision-engineered capacitive grading structure for electric field control
• Carefully controlled paper winding and layer arrangement
• Specialized resin impregnation and curing processes
• High manufacturing precision and stringent process control
• Designed to support reliable dielectric performance and long-term service life
// CUSTOM SOURCING & ENGINEERING SPECInquire Now
For RIP condenser cores, share dimensional drawings, capacitance requirements and electric-field constraints. Confirm design responsibility, manufacturing site and test scope with the quoted supplier.
Compatible Substation Apparatus
High-voltage transformer RIP bushings (oil-to-air, oil-to-oil, oil-to-SF6)High-voltage wall and through-wall condenser bushingsConverter transformer valve-side and DC RIP condenser bushingsGas-insulated switchgear (GIS) bushing internal coresOther high-voltage condenser bushings using RIP insulation technology, subject to design requirements
RIP Bushing Core (RPC) Technical Specifications Table
Showing 10 of 10 models
Catalog values are representative. Confirm the selected model, drawings and test evidence during inquiry.IEC 60137 covers complete AC bushings, not standalone RIP cores; agree core acceptance tests separately.
| Parameter | Specification |
|---|---|
| Rated Voltage Class | 52kV ～ 800kV (52, 72.5, 126, 145, 252, 363, 550, 800 kV) |
| Rated Current | 630 A ～ 5,000 A (Draw-lead or direct solid rod type) |
| Insulation Technology | Resin-Impregnated Paper (RIP) Capacitive Condenser Core |
| Partial Discharge (PD) | ≤ 2 pC at 1.05 Um / √3 (Far superior to IEC 60137 limit) |
| Dielectric Dissipation Factor | tanδ ≤ 0.0035 (0.35%) at ambient temperature |
| Glass Transition Temp | Tg ≥ 120 °C (High-Tg modified anhydride epoxy matrix) |
| Lightning Impulse Withstand (BIL) | Up to 2100 kV (depending on bushing rated voltage class) |
| Switching Impulse Withstand (SIL) | Up to 1600 kV (for 550kV & 800kV classes) |
| Thermal Insulation Class | Class E (120 °C) / Class B (130 °C) |
| Standard Compliance | IEC 60137, IEEE C57.19.01, GB/T 4109, DL/T 417 |
Custom Engineering & Flange Dimensions Note:
Dimensions, interfaces and replacement compatibility require approved drawings and technical review.
RIP Bushing Core Core Engineering Advantages
Precision-engineered capacitive grading structure with micron-level foil alignment for uniform electric field distribution.
Precision-engineered capacitive grading structure with micron-level foil alignment for uniform electric field distribution.
Specialized high-vacuum resin impregnation and automated step-curing preventing micro-voids and partial discharge.
Specialized high-vacuum resin impregnation and automated step-curing preventing micro-voids and partial discharge.
High-Tg modified epoxy resin matrix offering superior thermal endurance and mechanical integrity under cantilever stresses.
High-Tg modified epoxy resin matrix offering superior thermal endurance and mechanical integrity under cantilever stresses.
Dry-type solid insulation with no insulating oil or SF6 gas, avoiding oil-leakage and gas-related hazards in the insulation.
Dry-type solid insulation with no insulating oil or SF6 gas, avoiding oil-leakage and gas-related hazards in the insulation.
Broad voltage coverage from 52kV to 800kV, tailored to specific customer flange, conductor, and insulator dimensions.
Broad voltage coverage from 52kV to 800kV, tailored to specific customer flange, conductor, and insulator dimensions.
Agree routine partial-discharge and dielectric-loss tests for the quoted complete bushing and core scope.
Agree routine partial-discharge and dielectric-loss tests for the quoted complete bushing and core scope.
Compatible Substation Apparatus
High-voltage transformer RIP bushings (oil-to-air, oil-to-oil, oil-to-SF6)High-voltage wall and through-wall condenser bushingsConverter transformer valve-side and DC RIP condenser bushingsGas-insulated switchgear (GIS) bushing internal coresOther high-voltage condenser bushings using RIP insulation technology, subject to design requirements
RIP Bushing Core Materials & Manufacturing Process
Pure High-Density Crepe / Kraft Paper
Special electrical-grade high-purity crepe insulating paper with low ash content and high dielectric breakdown strength.
High-Tg Modified Epoxy Resin System
Low-viscosity, high-purity epoxy anhydride casting resin system with high glass transition temperature (Tg ≥ 120°C).
Precision Capacitive Aluminum Foil Screens
Smooth-edged conductive aluminum capacitor foil for electric field grading, processed without burrs to prevent field concentration.
Center Conductor / Mandrel Interface
Compatible with solid copper rods, hollow tubes, or draw-lead conductors with anti-loosening and mechanical lock design.
Engineering Inquiry Draft
Request Quotation for RIP Bushing Core
Enter your requirements and send them to our sales desk. If online sending is unavailable, you get an email draft instead.
RIP Bushing Core: FAQ
- What voltage and current range does the RIP Bushing Core cover?
- Catalogue voltage range: 52kV ～ 800kV; current range: Custom / 630A ～ 5000A. Confirm the rating of the specific model and drawing.
- What insulation or construction is used?
- Resin-Impregnated Paper (RIP) / Capacitive Graded.
- Which standards are referenced?
- Catalogue standard reference: IEC 60137 / IEEE C57.19.01 / GB/T 4109. Request type-test evidence for the specific model.
- Which applications is it used in?
- Power Transformers & Shunt Reactors.
Applications
ENGINEERING WHITEPAPERS & IEC GUIDES
View All 10 WhitepapersRelated Technical Selection & Standard Guides
Material ScienceSeries 06 · RIP Bushing Cores
RIP Condenser Cores: Design Inputs and Acceptance Checks
Review field grading, dimensions, impregnation, curing and model-specific dielectric tests when sourcing RIP condenser cores.
COMPLEMENTARY SERIES
View All 7 Series
