EHV DC Transmission Line Long Rod Insulators Composite Polymer
Dimensions and Characteristics of 110kV (132kV) composite polymer insulator
|Figure. No||Model||Rated Voltage||Specified Mechanical Load||Coupling Size||Section Length||Minimum Creepage||Full-Wave Impulse Withstand Voltage (Peak)|
1 Min Wet Power Frequency Withstand Voltage
1, 110kV (132kV) composite polymer insulator are designed to suit
to 110kV (132kV) transmission line s and 110kV (132kV) substations
2, Dead end fittings are up to the requirements from the clients,
usually we use ball, socket, tongue, clevis for suspension
insulators with forged steel or cast steel . The dimensions and
coupling size can be exactly according to the specification
requirements from the utilities.
3, The silicon rubber color of the insulators are also up to the
requirements from the clients and all the silicon rubber materials
past 5000 hours aging test silicon content test and hydrophobicity
4, ECR core rods are used in all the insulators, so we can
guarantee a very good mechanical strength and anti-acid pollution
performance for the insulators.
5, All our insulators were type tested and design tested in
accordance with IEC61109, maximum RIV is 100µV when tested at 1MHz
and10% over nominal line ground voltage for indicated system
6, All the 110kV (132kV) composite high tension insulators are
designed with one corona ring.
1, 110kV (132kV) overhead transmission power lines.
2, 110kV (132kV) substations.
1, Very good anti-pollution performance, no need to wash the
insulators after the installation in lines.
2, Very convenient installation because of its light weight and one
whole piece compared with glass insulators and ceramic insulators.
3, Excellent hydrophobicity characteristics can help to void
flashover and guarantee the insulators with very good electric
Competitive Advantages compared with ceramic insulators :
|The advantages of polymer/composite insulators over
|Factor||Ceramic/porcelain insulators||Polymer/composite insulators|
Heavy weight- For example
400kV - about 140kgs
90% lighter than them but with same mechanical strength
400kV -- Around 15kgs
|Fragility||Highly fragility to shock and vibration||No fragility to shock and vibration|
|Packing and transportation||Risky and very costly||Easy and economical|
|Installation||Risky expensive and more labor required||Very easy and economical|
|Maintenance cost||Very expensive||Low|
|Vandalism||More susceptible||Highly resistant|
|Breakages and secondary damage||Highly fragile- 10-15% breakages are reported during transportation
storage and installation||Flexible and therefore highly resistant to breakages|
|Mechanical failure||Reduction in mechanical strength and separation during to pings
getting eroded||Just with single piece, so no such kind of problem|
|Resistance to flashover and punctures||Low||High|
|Anti tracking and erosion resistance||Very low- poor tracking resistance||Excellent tracking resistance avoids erosion or tracking of the
|Dielectric strength||Lower than polymer||Excellent insulation performance|
|Contamination and pollution||Highly effected||Not effected and has much longer life|
|Hydrophobicity||No hydrophobicity, ceramic surface forms water films on the surface
making easy path leading to more flashover||Very excellent hydrophobicity|
|Self cleaning quality||No, dirty sand salt snow etc are easily attracted||Yes, due to hydrophobicity recovery characteristics|
|Tension strength||Good||Better during crimping technology|
|Maintenance||Needs maintenance like cleaning washing and greasing||Not required at all|
|Safety||Are easy to explosion and breakages due to high fragile properties
and stone throwing or gun shooting||Provide very high level of safety superior flexibility and
strength. not easy to break due to stone throwing or gun shooting.|