The electrical contact performance of power fixtures shall comply with the regulations
The electrical contact performance of power fixtures shall comply with the following provisions.
a. The resistance between the two ends of a wire connection should not be greater than the resistance of a wire of the same length;
b. The temperature rise at the connecting point of the conductor shall not be greater than the temperature rise of the connecting conductor;
c. The carrying capacity of all the fittings that bear the electrical load shall not be less than the carrying capacity of the wires to be installed.
Tungsten is an irreplaceable basic material and strategic resource in our national economy and modern national defense. Tungsten carbide rotary file, with high hardness and excellent wear resistance, is used to manufacture a variety of cutting tools, tools, drilling tools and wear-resistant parts, widely used in military, aerospace, mechanical processing, metallurgy, oil drilling,
High voltage direct current (HVDC) technology, since its rise in the 1950s, has experienced more than 40 years of development, has become an increasingly mature technology. By 1995, 62 HVDC projects had been successfully put into operation in the world, and it is expected that about 20 more HVDC projects will be put into operation by 2002.
This paper introduces the development of 1 000 kV ultra high voltage transmission relay protection and monitoring technology in foreign countries, and puts forward some technical problems to be studied in this field. This paper presents a relay protection and monitoring system platform for substation based on IEC 61850 standard. This platform can adapt to the characteristics of UHV transmission and has strong real-time performance. It is an information platform that integrates relay protection, emergency control and system stability.
The tower and pole test station built by Electric Power Construction Research Institute in 2004 carried out the prototype strength test of UHV single loop 8×800 split conductor, 30 ° ~60 ° Angle tower and UHV transmission line anti-vibration design scheme.