Power fittings are devices used to connect and combine, so power installation companies will use fittings. According to the definition of GB/T5075-2001 National Standard "Terms of Electricity Fittings": Electricity fittings are metal accessories that connect and combine various devices in the power system to transmit mechanical loads, electrical loads, and some protection.
Power fittings are metal parts used to connect power transmission line towers, wires, lightning protection wires and insulators, or to protect wires, lightning protection wires, insulators, etc.
Basic requirements: Power fittings are generally made of cast steel and malleable cast iron. It is required that the circuit fittings should have sufficient mechanical strength, and the part of the fittings connecting the conductors should have good electrical properties. During the manufacturing process of the circuit fittings, there should be no burrs, flashes, trachoma bubbles, cracks and deformation, the surface should be smooth and the galvanized layer should be uniform. The matching fittings should be of suitable specifications, no missing parts, and no corrosion. The screw and nut should be well matched. The contact surface of the clamp hull pressure plate and the wire should be smooth, and the manufacturing quality and size should comply with national standards and specifications.
The connection of power cable conductors is an important part of the production and installation of various types of cable heads. It is very important for the long-term safe operation of the line.
The power cable conductor connection methods include crimping method and welding method. The requirement of the conductor connection is that the temperature rise does not exceed the temperature rise of the cable conductor when transmitting current, and it can withstand the allowable tension of the cable conductor.
The crimping method is a method of using appropriate mechanical pressure to obtain an electrically conductive contact interface between conductors or between conductors and power connection fittings. According to whether the conductor is detachable after connection, it can be divided into clamping (detachable) connection and compression (non-detachable or dead connection) connection.
