Material Reconciliation for electrical estimation

http://constructionduniya.blogspot.com/2012/01/reconciliation.html?m=1

Introduction about Overhead line

System operation
Only  authorised and competent person shall make arrangements for swithes to be operated .
Notification of system operation
live conductors
Work near live conductors
work on HV conductors
RequIrements for isolation
Loking off
Tagging
Earthing
permission to  operate
Radio telephon Instructions

Responsibility of employees

Technical officer
Ensure that working condition are safe and to stop all work immediately any unsafe condition is notice.

And  plan the  work so  that it can be perform safely.

And make  shur that all nessery safty equipment is available.and  ensure that competent workers are present.and  have a skill  of take a immdiate steps  action.correct any  unsafe  action.

* Technical officer in charge of  linegang

in charge of Linegang  has a responsibility for following

Working condition is  very  safe
immdiate notice
Unsafe condition notice

Employees

Has a big responsibility to work with 
Safety to  himself
Safety to his workmates
safety to the public
Safety to equt and public & privet property.
this person must

Understand the safety rules and applythem  to his  work

Obtain a proper instructions

Any doubt ask  from the  TO
(No  introdption)
stop all  work  when  TO  notice a unsafe  condition notice

A Standard Method of Handsignals for lineman

Terms And Definitions

This  post  contain about (as a  example  Sri lankan  system)the  local  government and  privet sector position and  small  job  description.

And  this  must  give  you to small introduction  about who are the  authoritie person and  what they are duties.

And other thing is  some company  issue any  document considering about  safty  and terms and  condition.
If there is  an accident power break down.or any case. must be  followed  above  rules.there will be no .,.,(fill in the  blank)
1-Contractor

company who has been  awarded a contract by Main Company to carry out work of any type on any  part of  main company distribution system.

2-Employees
3-A technical officer
4-engineer

Technical terms

DCC

Distribution control center of  xcompany LV system and HV system.
And  controller  is  the  person  who is the authorised person  to control that things.

Live  or alive  mean
Energized or connected to  sourceof  electricity.

Isolated
De energised
Earthed
Kilovolt
Low voltage
High voltage
Extra high voltage
Gang

Safety Equipment for Work with Electricity

SAFETY

First we consider why we should design a safety manual befor design any electricity project.This electrical project could be a Mini Hydro power plant small transmission  line or any thing.
In this case authorized  person and unauthorized  person work with these things.if there is no limitation eny people can work what thay want, that is why we should publish a safety manual.
This manual should be a very simple.

Think .A company  doing a special duty.(Electrical supply and distribution work)

This  company must ensure

About theses facts.

1-The  safety of each employees

2-The safety of his workmates.

3-The safety of the public.

4-The safety of equipment and property.

 

Safety equipments

Safety belts

Employees must wear their safety belts at all time when up poles and structures and shall use their safety belts Continuesly except when changing position.

When employees sitting on the hydraulic platforms no need to ware safety belts.

And  before trusting his weight to the safety belt the employee shall make sure that the fastening s are properly engange and that he ia  secure in the  safety  belts

Insulation Gloves

It gives a primary protection when they are wore fro direct handling of live conductors on voltage up to 6kv.

When gloves are worn as secondary protection orto protect against voltage rises during faults.as for instance when operating Hv air brake swithes or isolators .o r  when  applyingor removing earth sticks gloves with 10000v test voltage are acceptable for all voltage.

Other Transmission Type

Information about my example.

What is This Transmission?

Electric power transmission is the bulk transfer of electrical energy, from generating power plants to electrical substations located near demand centers. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution.
 "power grid"  or "National Grid".

Transmission lines, when interconnected with each other, become transmission networks. The combined transmission and distribution network is known as the "power grid" in North America, or just "the grid". In the United Kingdom, the network is known as the "National Grid".

A wide area synchronous grid, also known as an "interconnection" in North America, directly connects a large number of generators delivering AC power with the same relative frequency, to a large number of consumers.

 "Utility frequency"

The same relative frequency, but almost never the same relative phase as ac power interchange is a function of the phase difference between any two nodes in the network, and zero degrees difference means no power is interchanged; any phase difference up to 90 degrees is stable by the "equal area criteria"; any phase difference above 90 degrees is absolutely unstable; the interchange partners are responsible for maintaining frequency as close to the utility frequency as is practical, and the phase differences between any two nodes significantly less than 90 degrees; should 90 degrees be exceeded, a system separation is executed, and remains separated until the trouble has been corrected.

Small History