English
Insulators under fire, what are we talking about?
- A line directly in the fire is considered as lost
- A line near the heat of a fire can be saved
- What is the condition of insulators on a line nearby a fire?
Reliability of insulators during or after a fire is a key consideration for T&D line design or refurbishment.
One must evaluate the risk of a line drop in the proximity of a fire as well as the possibility for a catastrophic failure afterwards resulting from a degraded insulator.
Our study on a comparison of insulators electromechanical strength after heat exposures shows
For porcelain and composite insulators
During an extreme heat exposure, there will be no mechanical separation below rating for porcelain insulators but punctures induced by crack developing internally. The weakening resulting from heat exposure can become a threat for the future of the line.
For polymer insulators, during an extreme heat exposure, there will be:
- Decrease of polymer insulators’ mechanical strength without any recovery after the cooling
- Moreover, the decrease of strength occurs quickly after the beginning of heat exposure
Even if the line does not drop immediately, the mechanical strength reduction of polymer insulators has compromised the integrity of the line with a potential hazard for the future.
Toughened glass insulators do not lose their performance after a fire
- Toughening glass -> no crack propagation or puncture even during or after heat exposure
- Easy visual inspection after the fire
- Mechanically safe at high temperatures and even with a damaged shell
In comparison
As a result, with toughened glass insulators
- No risk of line drop under extreme heat
- No risk of line drop after fire is over
- No risk of accelerated ageing as a result of heat stress
Need more info? Don’t hesitate to contact us for a specific webinar presentation.
The information collected through this form are processed by SEDIVER, a simplified joint stock company, registered with the Nanterre Trade and Company register under number 542035761 and whose headquarter is located 7/9 allée de l’Arche 92400 Courbevoie for the purpose of allowing the download of our whitepaper documents and to send you information about our group’s companies and products. The legal basis for these processing activities is our legitimate interest to know who access and download our resources and to send them direct communication.
Fields marked with an asterisk (*) are required information. Should you fail to give this required information, you will not be able to download our whitepaper documents.
You have a right of access, rectification, erasure and limitation with regard to the processing of your personal data as well as the right to define guidelines regarding what happens to your data after your death and the right of portability of your personal data, to the extent applicable under local legislation. You also have a right to object to the receipt of marketing communication by ticking the dedicated box of this form, and at any time by clicking on the unsubscribe link placed in all our marketing communications.
To find out more about how we process your personal data and to exercise your rights, please refer to the SEVES group EU privacy policy and the SEDIVER privacy policy.
For more information, please consult our Privacy Policy.