Testing instrument transformerIs a relatively important electrical equipment. For transformers, their use is inseparable from the environment. The use of the environment will affect the use of the transformer. The transformer needs a suitable environment and can only be operated during operation. Get good results and performance quickly. What is the impact of the transformer environment on the transformer?
In general, the external environment required for a transformer has the following requirements:
Altitude: at altitude1000MTransformers used in areas below and below do not take into account the effects of altitude. At an altitude of more1000MThe area of the use of the transformer, must consider the high altitude area of the thin air. The heat dissipation of the transformer and the dielectric stability of the external insulation are affected.
Therefore, for those at altitude> 1000mFor transformers used in high altitude areas, the actual height of the product operating position must be specified in the contract so that the manufacturer can consider the temperature rise limit of the transformer and the minimum air gap external insulation. Generally, the external insulation of the housing is strengthened, the leakage distance along the surface and the distance to the ground are increased, and the size of the air gap between the housing and the grounded portion of the housing is increased. If the manufacturer is located in the normal altitude area, the temperature rise limit of the transformer in the high altitude area can be controlled according to the reduced temperature rise limit.
In terms of the average temperature rise limit of the winding, the altitude is greater1000M, oil-immersed natural cooling per400MDecrease1K, oil-immersed air cooling per250MDecrease1K, dry natural cooling per500MDecrease2.5%, dry air cooling reduced5％。
If the ambient temperature of the high altitude operation area provided by the user department is lower than the normal specified ambient temperature, and1000MDecrease5or more requirements, it is considered that the transformer in high altitude areas, the heat dissipation conditions are reduced. The effect of the temperature increase has been compensated by a decrease in the ambient temperature. The temperature rise limit of the transformer used in the high altitude area test of the manufacturer at normal altitude may not be corrected and can be specified in the contract. In this way, the device transformer can be more economical and cheaper.
The maximum wind speed at a certain distance from the ground in a period of time is usually specified. The wind speed will affect the casing and the auxiliary equipment installed on the transformer tank. For the above ground10MThe wind speed is10minutes35M / S, For the casing, oil conservator, radiator or cooler and other accessories installed on each transformer, the influence of wind speed should be considered in the mechanical device.
Relative humidity is expressed as a percentage value at a particular temperature.
When the relative humidity is high at high temperature, the mold is easy to multiply, and these molds will affect the paint on the surface of the fuel tank. In addition, when the temperature changes, such as the temperature drops and the relative humidity increases, the high relative humidity at high temperature will easily condense into water, thereby reducing the surface resistance of the housing. High humidity also affects the corrosion of metals.
General products should be in25The relative humidity is90% of cases considered. If there are special requirements, can be indicated in the contract.