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Topic Title: calculation for number of insulators.
Topic Summary: Formula for calculation of no. of dics for high voltage line.
Created On: 09 June 2013 09:22 PM
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 09 June 2013 09:22 PM
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umair84

Posts: 6
Joined: 30 May 2013

Anyone help me in calculating no. of dics for high voltage line like 132KV, 220KV, 400KV, etc.
 10 June 2013 12:04 PM
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Zuiko

Posts: 521
Joined: 14 September 2010

I assume you mean number of sheds?

There are many factors to consider:
1) Nominal voltage
2) Material (glass, ceramic, poly etc.)
3) Environment (dry, wet, salty, acidic, polluted etc)
4) which influences the minimum allowable creep distance
5) Mechanical load


DNOs will have their own enginering procedure, it might be worth trying to track down the SAP/Engineer in charge of the overhead line unit from your local DNO depot and asking politely for a copy of their procedure?


British Standard BS EN 60305:1996 (ceramic and glass insulators)
IEC 815 1986 Insulators for use in polluted conditions
IEC 60383-1, Insulators for overhead lines with a nominal voltage above 1 000 V - Part 1: Ceramic or glass insulator units for a.c. systems - Definitions, test methods and acceptance criteria
IEC 60383-2, Insulators for overhead lines with a nominal voltage above 1 000 V - Part 2: Insulator strings and insulator sets for a.c. systems - Definitions, test methods and acceptance criteria.
IEC 61466-1, Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V - Part 1: Standard strength classes and end fittings
IEC 62217:2005, Polymeric insulators for indoor and outdoor use with a nominal voltage > 1 000 V - General definitions, test methods and acceptance criteria
ISO 3452 (all parts), Non-destructive testing - Penetrant testing

Edited: 10 June 2013 at 02:05 PM by Zuiko
 20 June 2013 04:24 PM
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Hafisoh

Posts: 3
Joined: 20 June 2013

Hi Zuiko san,

If I have considered some of the above factors, for instance :

a) applied voltage is 400kV - suspension insulator
b) material is silicone rubber with FRP core
c) SPS class is medium, assuming the basic USCD is 34.7
d) the load is 20 pounds
e) section length of insulator is 5250 mm

my questions are :

a) how can I measure the total of creepage distance
b) how to determine the minimum distance between sheds (will apply uniform sheds)
c) how to calculate the number of sheds that is required
d) is there any references for equations related to insulator design

thanks in advance
 22 June 2013 09:19 AM
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Hafisoh

Posts: 3
Joined: 20 June 2013



Hi Zuiko ,

I have post some questions for your attention and looking towards your reply. Your inputs are much appreciated.

Best regards
 23 June 2013 11:13 AM
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Hafisoh

Posts: 3
Joined: 20 June 2013

Hi Zuiko ,

Thanks a lot

Regards
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