Load rating of jumper nose
Connection metal structure, connection size, nominal damage load match, pay attention to the metal and insulator and wire grading. Take over the bridge lead, often use parallel channel clamp, T - clamp, but for the main current larger, it is advisable to use jumper nose.
When the carrying capacity of the wire is large, it is very sensitive to the contact resistance of the wire connector. The contact resistance causes the connector to heat up, lose electric energy and generate voltage drop. The shape of the aluminum jumper nose is similar to that of the aluminum terminal (aluminum nose). The jumper nose USES hydraulic pressure or clamp pressure to compress the wire, the joint is in close contact, the lap plate connected by bolt is wider and thicker, the contact resistance is small, which is good for heat dissipation and convenient for disassembly and assembly.
Type characteristics of single suspension insulator string assembly
An insulator string is a component consisting of two or more insulator elements combined to flexibly suspend a wire. Insulator strings are protective devices with fixed and operational requirements for hanging wires and insulating wires from towers and earth.
Suspension insulator string is suitable for single suspension insulator string in straight line tower (or jumper wire of tension-resistant tower). In normal operation, it can only bear the conductor and additional vertical load and wind load, and also bear the wire breaking tension of the conductor in case of an accident. So the dangling insulator string has to satisfy both of these conditions. Due to the different vertical loads, the pendant insulator strings in each phase may be assembled in different types of single string, double string or multiple strings.
Aerial bare wire lightning protection hardware (eliminate) lightning break more secure!
With the transformation of urban and rural power grid, the number of IOKV power transmission lines is increasing, and lightning break accidents occur frequently. When lightning strikes high voltage wire voltage flashover discharge, easy to make the wire burned. According to the lightning disconnection mechanism of IOKV overhead bare wire and the operation rule of power-frequency arc, the practice has proved that the disconnection of bare wire is due to the high lightning impulse voltage and current, and the breakdown of the porcelain insulator in the weak point of the line causes flashover discharge, burning the insulated straight bottle and wire at the same time.
How does a composite insulator ensure its creepage resistance?
Composite insulators are composed of mandrel, connecting fittings at both ends of mandrel, insulating sheath and umbrella skirt covered by mandrel. Emerging composite insulators are widely used in power systems due to their advantages of light weight, high strength, good electrical performance and easy maintenance. Existing composite insulators umbrella skirt type are belong to the upper and lower structure, existing umbrella skirt skirt body in line with a single straight segment, has certain thickness of the section of rotors, the top of the umbrella skirt body are connected to the sheath and extends outward with less than 30 degrees slope Angle, the insulation of the umbrella skirt body outer surface composed, on the surface and under surface fluctuation on the surface of the slope Angle is 18 degrees commonly or 10 degrees. This traditional umbrella skirt body, because the Angle of inclination is small, the rain will wet all umbrella skirt body, including the part below the umbrella skirt; In addition, dirt such as bird droppings will flow with rain to the various umbrella skirts on the insulation sheath; As a result, its overall anti-creepage performance is greatly reduced, which is easy to cause accidents.
