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Help CenterPorcelain Insulator With Mill Test Report for 20 kV and 35 kV Applications
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As a professional manufacturer with over a decade of experience in electrical insulation solutions, Jinhua Dika Electrical Equipment Co., Ltd. is proud to present our premium Porcelain Insulators. Engineered for reliability in demanding 20 kV and 35 kV applications, our insulators are the cornerstone of safe and efficient power transmission and distribution networks worldwide. We combine rigorous ISO9001-certified manufacturing processes with high-grade materials to deliver products that consistently meet international standards. Every unit is backed by a comprehensive Mill Test Report, ensuring full traceability and quality assurance from raw material to finished product, giving our global partners in North America, Europe, Asia, and beyond the confidence they need.
Our porcelain insulators are designed to withstand harsh environmental conditions while providing exceptional electrical insulation. The core value lies in their proven durability, high mechanical strength, and stable dielectric performance over a long service life.
- Superior Material Integrity: Manufactured from high-alumina electrical porcelain, known for its excellent resistance to weathering, corrosion, and thermal shock. The material's low porosity prevents moisture absorption, a critical factor in maintaining insulation resistance.
- Rigorous Quality Control: Each production batch undergoes stringent testing, including dielectric strength tests, mechanical load tests, and temperature cycle tests. The provided Mill Test Report details chemical composition, physical properties, and test results, offering complete transparency.
- Optimized Design for Performance: The shed profile is carefully designed to maximize creepage distance, effectively preventing flashover in polluted or humid conditions. This design enhances safety and reduces maintenance needs for overhead lines and substation equipment.
- Robust Mechanical Construction: Built to handle significant mechanical loads from conductors and environmental forces like wind and ice. The secure metal fittings (galvanized iron or ductile iron) are cemented to the porcelain body with a high-strength compound, ensuring a reliable, permanent bond.
Below is a summary of key specifications for our standard range:
| Parameter | Typical Value for 20 kV | Typical Value for 35 kV |
| Rated Voltage (kV) | 20 | 35 |
| Power Frequency Dry Withstand Voltage (kV, min) | 65 | 95 |
| Power Frequency Wet Withstand Voltage (kV, min) | 45 | >50|
| Lightning Impulse Withstand Voltage (kV, min) | 125 | >170|
| Minimum Mechanical Failing Load (kN) | 70 - 120 (varies by type) | 100 - 160 (varies by type) |
| Standard Creepage Distance (mm) | 400 - 600 | 650 - 900 |
| Main Standards | IEC, ANSI, GB, or customer-specific standards | |
The benefits of choosing our insulators extend beyond the product itself. Clients gain a reliable partner committed to supporting the infrastructure of diverse markets, from the power grids of North America and Western Europe to developing networks in Southeast Asia and Africa. Our insulators contribute to reduced line losses, minimized unplanned outages, and lower total cost of ownership due to their longevity and minimal maintenance requirements.
With an annual export value reflecting our global reach and a dedicated team ensuring quality, Jinhua Dika has established itself as a trusted supplier in the electrical equipment sector. Our products ship from major ports like Shanghai and Ningbo, ensuring efficient logistics to your project site. We invite utility companies, engineering procurement contractors, and distributors to experience the difference that certified quality and documented reliability can make. Contact us today to discuss your 20 kV or 35 kV insulator requirements, request detailed specifications, or obtain a sample Mill Test Report to verify our commitment to excellence for yourself.
Frequently Asked Questions (FAQ)
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What is included in the Mill Test Report (MTR)?
The MTR is a certificate from the raw material manufacturer. For our insulators, it typically includes data on the porcelain body's chemical analysis (SiO2, Al2O3 content), physical properties (density, porosity), and results from factory tests like bending strength, confirming the material meets specified grades. -
Are these insulators suitable for coastal or highly polluted areas?
Yes. We can manufacture insulators with an extended creepage distance and specific shed designs (like anti-fog profiles) to increase performance in high pollution severity (PS) classes. Please specify your environmental conditions during inquiry. -
What types of hardware fittings are available?
Standard fittings include hot-dip galvanized cast iron or ductile iron for superior corrosion resistance. Ball and socket, clevis, or tongue configurations are available. Custom fittings can be discussed based on your assembly drawings. -
How do you ensure the cement bond between porcelain and metal?
We use a high-expansion cement under controlled conditions. After assembly, the unit undergoes a curing process. The bond strength is verified through routine mechanical load tests, ensuring it exceeds the rated mechanical failing load. -
Can you provide insulators according to specific international standards?
Absolutely. Our production is flexible and can comply with major standards such as IEC 60383, ANSI C29.2, or national standards like GB/T 1001.1. Please provide the standard number and relevant clauses with your inquiry. -
What is the typical lead time for an order?
For standard specifications, lead time is approximately 30-45 days after order confirmation. Larger or custom-designed batches may require additional time, which we will communicate upfront. -
Do you offer sample products for testing?
Yes, samples can be provided for evaluation and type testing. Contact our sales team to arrange sample availability, which may be subject to model and quantity. -
How are the insulators packaged for export?
They are securely packed in wooden crates or strong cartons with internal padding to prevent transit damage. Each crate is clearly marked with product details, quantity, and handling instructions.
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