Trailer mounted insulators washing systems are used primarily in electrical substations where it can be towed from one location to another for washing substation equipment. In many cases it is advantageous to use a trailer mount system because it has a lower profile and can be moved into better positions for washing than a chassis mount system. Trailers can have one or two axles depending of the load of water to be carried.
How to Prevent a Flashover when using an insulator washer truck live line
In order to prevent a flashover from occurring during insulator washing, the following points must be taken into consideration:
- Insulator washing should start on the lowest phase conductor.
- Always undertake the washing so that the spray does not fall on dirty insulators, as this may cause a flashover.
- Washing should always start at the bottom of the insulator, finishing at the top of the string.
- Always wash then flush the string.
- It is extremely important to consider the direction of the wind.
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Aerial Platform specs for Hot Line insulator washer
In general an insulator washer platform needs to be able to reach a height of the highest cross arm less about six meters. For example: if an insulator cross arm is at a height of thirty meters (30m) then the platform must be able to reach a height of 30 – 6 = 24 meters.
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The Effectiveness of Washing Systems
In the current market, there are some very simple and economical products, however these do not provide the required degree of effectiveness. This inadequacy stems from their limitation in the reach of their water stream and impact pressure on the contaminated insulators. Often these “economical” washers tend to not have safety devices incorporated in them. This is a problem because running out of water will damage the water pump. Effective washer systems have safety interlocks to prevent this from happening.
In order to wash at transmission voltages, the water must have a minimum resistivity value of 1000 ohms per inch, or 2540 ohms per centimeter or 400 micro mho/cm maximum conductivity. A washing system that meets this standard can effectively and safely wash all of the transmission voltages used today.
