Aging problems of medium voltage insulation heat shrinkable
Medium voltage insulation heat shrinkable tubes are widely used in power supply systems and insulation protection of power busbars, cable joints and transformer terminal blocks of substations in mining, chemical, petrochemical and other industries. It has become the primary choice for comprehensive protection of power systems. However, any product has a shelf life, and there will be problems after the heat-shrinkable tube has passed a limited period. Today we will talk about the aging problems of medium voltage insulation heat shrinkable tube.
The aging problems of medium voltage insulation heat shrinkable tube mainly include the following:
1. After the heat shrinkable sleeve is produced, the stacking time is too long to be used, which exceeds the specified service life (normally, the heat-shrinkable tube has a service life of 20 years), and the heat-shrinkable tube that has reached the service life will be aging.
2. The problem of the product of the heat shrinkable sleeve itself, the ratio of the ageing agent in the raw materials is unreasonable. The company has a professional R & D test team can calculate the proportion of more accurate anti-aging agent through actual tests and tests. Manufacturers without R&D teams don't know the correct ratio. Some even don't put anti-aging agents or use inferior raw materials, which leads to the aging resistance of the products not meeting the requirements.
3. Construction method and working environment of heat shrinkable sleeve. Sometimes the professional skills of the construction workers are not in place. The firepower of the heating is not well mastered, causing the surface of the heat shrinkable sleeve to burn or excessively blacken, which reduces the performance of the product and accelerates the aging. The normal use temperature of the heat shrinkable sleeve should be between -55℃ and 125℃. Below or above this operating temperature will also aggravate the aging problems of medium voltage insulation heat shrinkable tube.
4. When the manufacturer uses the heat-shrinkable tube, only the copper row is covered, and the joint of the copper row is not treated. The temperature difference between the surface of the heat-shrinkable tube and the surface of the bare copper tube is generated, and the surface of the heat-shrinkable tube is prone to condensation or water vapor.