Transmission lines with higher system-voltage carry greater power flow. They serve the role of trunk feeder in the delivery of power. Instability in EHV and UHV line operation may cause great negative impact on the entire power system.
Thus, insulators for EHV and UHV transmission lines require not only endurance against higher electrical and mechanical stress but must also ensure uniformly high quality to maintain the reliability of system operation.
NGK insulators have been the choice for the majority of the world's EHV and UHV transmission projects because of quality and performance. Successful long-term service experience in higher system voltage illustrate the reliability and quality of NGK suspension insulators.
| 1,000 kV | Kashiwazaki - Kariwa - Higashi Yamanashi, Japan |
|---|---|
| 1,000 kV | Minami Iwaki - Nishi Gunma, Japan |
| 800 kV | Anpara - Unanao, India |
| 800 kV | Kishenpur - Moga, India |
| 800 kV | Guri - Sur - Arenosa, Venezuela |
| 765 kV | Amos - North Protrvilk, U.S.A. |
| 735 kV | Levis - Des Cantos, Canada |
Experience is one of the most important considerations in choosing insulators for High Voltage Direct Current power transmission, because special design and materials are necessary to solve such problems as DC contamination, ion migration and thermal runaway, issues unique to HVDC transmission.
NGK has been providing customers with solutions for HVDC insulators, knowledge gained from extensive field experience as well as research and development at our High Voltage Lab.
Over the past 20 years, NGK group has supplied more than 70% of the suspension insulators required for the world's HVDC projects.
| ±500 kV | Gezhouba - Shanghai, China / 1000km |
|---|---|
| ±500 kV | Toamsemqiap - Guanzhou, China / 900km |
| ±500 kV | Toamsemqiap - Guanzhou, China / 900km |
| ±500 kV | Chandrapur - Padghe, India / 740km |
| ±500 kV | Anan - Kihoku, Japan / 170km |
| ±450 kV | James Bay, Canada / 1100km |
| ±>350 kV | Leyte - Luzon, Philippines / 460km |
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