8 questions about insulated gloves
Insulating gloves are commonly used safety tools and important insulation protection equipment in electric power operation maintenance and inspection test, with the development of electric power industry and promotion of live working technology, more stringent requirements are imposed on the safety performance of insulating gloves.
1. the difference between insulated gloves and ordinary protective gloves
The insulating gloves are different from ordinary gloves. Insulating gloves are made of insulating rubber material in the structural, the insulating layer forms a sealed insulating system to protect hands. While ordinary gloves are not used insulating materials, the insulation performance is very low and easy to leakage. Insulating gloves must be tested for electrical performance in factory, and can be shipped only passed the standard, while ordinary gloves do not need that.
2, why insulated gloves should be worn in a dry state?
Wearing insulated gloves in a dry state is a essential that user must pay attention to, because volume resistance and surface resistance of insulator are greatly reduced if insulating gloves contain a certain amount of moisture. Water is a conductor, the insulation properties of insulator are greatly reduced or even destroyed due to the presence of water. In addition, there are many impurities in the water, chemical changes occur to form electrical conductors in some specific cases, such as heat, light and electricity, which will deteriorate insulation performance. Therefore, keeping insulating gloves dry can greatly improve their safety performance.
3. What is the most important indicator for determining the performance of insulated gloves?
The purpose of wearing insulated gloves is to prevent electric shock damage, which is mainly caused by the current flow. Therefore, the protective performance of insulated gloves mainly depends on the leakage current passing under a certain voltage. It is safe if the leakage current within safe current value range., otherwise it is not safe. If a certain voltage is applied, it will not break through the human body, the large leakage current will hurt body.
4. Why should we conduct preventive tests on insulated gloves?
Preventive testing is a strict regulation of power industry for ensuring personal safety. Insulating gloves are valid for a long period. Within long time, it is necessary for users to conduct preventive tests due to their aging and change of storage conditions before use, so that make sure safety. Insulating gloves that exceed shelf life must be tested before, it can be used only after passing the test.
5. What is difference between insulated gloves for live working and rubber high & low voltage insulated gloves?
Insulated gloves for live working allow live working in different types of voltages. High & low voltage insulated gloves are auxiliary safety devices that are not allowed to be live work. Users can carry out routine test and inspection according to different models when purchase insulated gloves for live working. Insulation glove is checked if the leakage current is less than 16 mA (410 mm in length).
6, why some insulating gloves are found cracks in the test?
Insulating gloves for live working are subjected to high-pressure test, because the height of injection water is not standard or the glove cuffs are not soaked, the arc is generated between two stages under high pressure, discharge in the air, cause the sound and air ionization. When the concentration of ozone increases, it causes great oxidative damage to the rubber, cause rubber crack and damage. The high-pressure test is a damage test for rubber. Therefore, it is stipulated that preventive tests should be carried out during use to ensure the safety of users.