What are the Common Physical Indicators of Insulating Rods?
The common insulating rods of electricians are classified into inorganic insulating rods, organic chemical insulating rods and mixed insulating rods according to their different physical properties. The mixed insulating rod is a variety of extruded insulating rods which are produced by processing the left and right kinds of raw materials, and are used as bases and shells of household appliances. Common inorganic insulating rods are: biotite, asbestos, natural marble, porcelain, safety glass, sulfur, etc., the key is the winding insulation resistance of electric motors, household appliances, the bottom plate of the power switch and insulators. Organic chemical insulation rods include: shellac, epoxy resin, vulcanized rubber, pure cotton yarn, paper, hemp, polyester, etc. Most of them are used to manufacture insulating varnishes, coated insulation wires for winding transmission lines, etc.
The function of the insulating rod is to protect the charged parts with different potential differences in electrical equipment. In addition, it is required to maintain good heat transfer, water and lightning resistance, high mechanical strength and convenient processing and processing. According to this regulation, the performance indexes of common insulating rods include insulation resistance strength, tensile strength, ratio, and thermal expansion coefficient. Therefore, the insulating rod should first have a high insulation resistance and pressure and compressive strength, which can prevent safety accidents such as power generation and breakdown. The second temperature resistance performance is better to prevent embrittlement and deterioration due to long-term overheating.
Insulation resistance breakdown voltage Compressive strength: The higher the current voltage applied to both sides of the insulator, the greater the electric field force that the charge in the raw material is subjected to, and the more prone to ionization impact, resulting in breakdown of the insulator. The lowest standard current voltage that causes the insulator to breakdown is referred to as the breakdown voltage of this insulator. The voltage applied during application should not exceed its rated voltage to prevent a safety accident. When a 1 mm thick insulating rod is broken down, the voltage that must be added is called the insulation withstand strength of the insulating rod, which is called the dielectric strength. Because the insulating rods have the necessary insulation strength, a variety of electrical equipment, a variety of safety equipment (electrician pliers, electroscope, insulating gloves, insulation rods, etc.), all kinds of electrical materials, manufacturers have certain tolerances The voltage used is called the rated voltage.
Tensile strength: The tensile strength of the insulating rod unit wire cross-sectional area, for example, the safety glass can bear a tensile force of 1400 Newtons per square centimeter of wire cross-sectional area.