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Tuesday, February 27, 2007

Underground cable in Laos



Conventional distribution line in Laos is overhead lines with medium voltage of 22 kilovolt. In the past there was 6.6 kV system, and in some area especially where the line connects to Vietnam grid, there is medium voltage with 33 kV.
Underground cables are used in the big cities like Vientiane capital and the world heritage city - Luangprabang (XLPE cables, PVC cables, electric wire and cables) .
There is also underwater cable across Mekong river to Thailand.

Monday, February 19, 2007

Watt-hour meters in Laos


Electricity is transmissted from dams to substations through 115 kilovolt lines. The highest hi-voltage transmission line in Laos is 500 kilovolt (under construction). In the subtations electricity is transformed to 22 kilovolt. The transformers in the streets lower the voltage to 400 volts, three phase four wire system and 230 volt 1 phase 2 wire system.
In every houses we still can see analogue watt-hour meters. Long time ago watt-hour meters were installed to the houses' walls behind the fences. Recently they were moved to the electric poles outside the fences in order to easy access for meter reading. Meter reading is performed manually by personnel from Electrical utility( EdL).
Recently the chinese company is trying to sell prepayment electronic watt-hour meters to EdL.


Monday, February 5, 2007

High above the ground



For the workers, who erect the steel towers and do stringing work, being above the ground is their work.
They work, eat and even sleep on the steel towers.
Some of them can walk on one single conductor so freely like walking on the ground.


Some towers are 1 hundred meters high but common height of steel towers is about 30 meters high.
You decide how much money do you require for this kind of job? You will have a safty belt and nylon rope