What is the live line?
In trenchless construction, a live line is any underground utility pipe or cable that is actively in operation. The term can refer to energized electrical lines, water/wastewater pipes, oil and gas pipelines, etc.
What steps are followed during the maintenance of line?
Line patrolling, maintaining ground clearance, replacement of insulators, restringing of lines, replacement of burnt jumpers, replacement of damaged conductor, replacement of damaged pole, etc. are some of the cheeks performed during maintenance. Proper maintenance of line improves its life drastically.
What are the safety precautions that a person should take when carrying works that are in close proximity to high voltage?
There are some precautions which must be followed to avoid electrical hazards and risks:
- Towers carrying live conductors must not be climbed as it can cause electric shock if the tower is energized.
- Animals should never be tied to a transmission tower or pole as it can risk their life.
What is a barehand lineman?
Bare Hand Live-Line Work. Bare-hand, or potential working involves placing the worker in direct electrical contact with an energized overhead line. The worker might work alongside the lines, from a platform that is suspended from them, or may sit or stand directly on the line itself.
What is live voltage?
LIVE WIRE The live wire is connected directly to the generators of the electricity supply company.It carries current at high voltages (about 220−230V).
Do linemen work on live wires?
A lineman protected by insulating gloves, along with other insulating equipment, can work in direct contact with live lines.
How do you know if a power line is live?
You can’t tell by looking whether a line is “live” or “hot” or not. Even if a downed line isn’t actively sparking, always assume it is carrying electricity. Stay at least 30 feet away from any downed power line, and don’t go near the pole or anything touching the line. Call 911 immediately if a power line is down.
What are the dangers of the powerlines?
In conclusion, there are no known health risks that have been conclusively demonstrated to be caused by living near high-voltage power lines. But science is unable to prove a negative, including whether low-level EMFs are completely risk free.
What is cold line maintenance?
Preventive Maintenance Cold line Maintenance : Cold Line Maintenance Method is the method of maintenance in which supply is completely switched off (de energized the line during the maintenance work) on which maintenance has to carried out .
Why power lines are not insulated?
Overhead transmission lines are not insulated primarily due to three reasons: first and foremost is to reduce the weight of the lines, secondly to save cost and the last is they are at sufficient height to avoid direct contacts. Let us discuss each one of the reasons one by one elaborately.
What is maintenance procedure?
A standard maintenance procedure is a detailed list of steps that describes how to perform a maintenance task and is also a documented standard to which the job or task should be performed. …
What is live-line maintenance?
INTRODUCTION The term live-line maintenance includes maintenance activities using the hot stick or the bare hand technique. Fig 1.1:- Hotstick technique Fig 1.2 :- Barehand technique Live-line maintenance is a procedural activity and does not include such activities as switching, climbing inspection, conductor stringing.
What is live line working in Electrical Engineering?
In electrical engineering, live-line working, also known as hotline maintenance, is the maintenance of electrical equipment, often operating at high voltage, while the equipment is energised. Although this is more hazardous for personnel than working on electrical equipment with the power off,…
How do you define line maintenance?
The easiest one (although also the one with least common sense) is to define line maintenance as maintenance tasks limited by a certain interval (for instance all tasks with an interval of up to 500 flight hours, 500 flight cycles and 1 calendar year may be considered line maintenance).
How often should line maintenance be carried out?
A daily check is performed anywhere from every 24 to every 48 hours. A weekly check is performed every 7-8 days. Apart from that, there may be several OOP (out of phase) maintenance tasks which can be considered to be line maintenance and carried out by a line maintenance provider.