7/27/2019 Hot Line Maintenance in Transmission Section.pptx

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Presented by: H.L. Ruchira Gunawardana

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What is hot line maintenance? Work performed on transmission lines while they are

energized and in service.

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Why we perform hot line

maintenance?

It minimizes the power interruption duration

Improves the reliability of the system Need of redundancy is minimized

Financial benefit

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What we can do? Replace suspension insulators

Replace tension insulators

Insulator washing Hardware fixing

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Hot line maintenance methods

Bare hand method

Hot stick method

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Bare hand method Linesman at line potential using a conductive kit.

(uses the faraday cage concept)

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Bare hand method…. 

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Hot stick method Lines man stays in the ground potential.

Lines man Keeps specified distance from the line.

Carries out the work using an insulated stick. Required tools can be mounted at the end of the

sticks.

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Necessary clearances

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Hot line tools…. 

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Hot stick method ….… 

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Special features of hotline tools High dielectric strength

100kV/m insulation level

Moisture resistant Light weight

Mechanically strong

Orange colour

No changes on the rod due to sudden temperaturechanges

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Main requirements to do a hot line

maintenance Reliable toolkit

Good weather condition

Skilled labor Experienced supervisor (EE/ES)

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Safety precautions…  Frequent testing of tools

Cleaning the sticks using silicon cloth

Inspection of towers before carrying out themaintenance

Switch off the autoreclosure function of the circuitbreakers

Frequent training

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Thank You!