hot line maintenance in transmission section.pptx

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 1/15

Presented by: H.L. Ruchira Gunawardana

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 2/15

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

energized and in service.

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 3/15

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

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 4/15

What we can do? Replace suspension insulators

Replace tension insulators

Insulator washing Hardware fixing

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 5/15

Hot line maintenance methods

Bare hand method

Hot stick method

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 6/15

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

(uses the faraday cage concept)

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 7/15

Bare hand method…. 

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 8/15

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.

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 9/15

Necessary clearances

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 10/15

Hot line tools…. 

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 11/15

Hot stick method ….… 

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 12/15

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

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 13/15

Main requirements to do a hot line

maintenance Reliable toolkit

Good weather condition

Skilled labor Experienced supervisor (EE/ES)

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 14/15

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

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

http://slidepdf.com/reader/full/hot-line-maintenance-in-transmission-sectionpptx 15/15

Thank You!