On-load tap changer is an important part of transformer. It playing role in voltage regulation, and its safe stable operation affects the reliability power supply grid. The has to maintenance after a certain number operations. In process, there are problems such as long time consumption low efficiency. On this basis, paper proposes development on main transformer on-load hoisting equipment. bee...

Abstract A protocol conversion method of intelligent distribution equipment for a new power system is proposed to aim at the problems short data reading distance and high packet loss rate in current process equipment. The divided into two parts, uplink channel, downlink channel. multi-protocol designed. data-based scheme set up realize bidirectional protocol. original gateway replaced by CAN-PR...

The origins of karate and its evolution as a sport are described. Karate injuries tend to occur in three main areas: the head and neck, the viscera, and the limbs. Effective legislation controlling karate, which could help prevent injuries, is lacking at the moment and should be established. Recommendations for the prevention of injury include the introduction of weight classes, mandatory prov...

The use of high vacuum for the control of insects seems never to have been considered seriously by the commercial world. The recent development and exploitation by private interests of a vacuum chamber intended for the treatment of certain warehoused commodities as a part of the equipment of a modern storage warehouse has aroused much interest in business circles and has given the writers an op...

With the increased use of electric and electronic equipment in our offices, our daily exposure to electromagnetic fields has become increasingly complex due to the great variety of the frequency content of the fields. Today focus has shifted from monitors as the dominating sources of electromagnetic fields to other electronic equipment, cabling, nearby substations, power lines and stray current...

In high-speed wavelength-division-multiplexed synchronous optical network (SONET) ring networks, the terminal equipment costs associated with electronic multiplexing can be predominantly high. Placing a wavelength add–drop multiplexer (WADM) at each network node allows certain wavelengths to optically bypass the node without being electronically terminated. This approach can effectively reduce ...

(NIST) promotes the U.S. economy and public welfare by providing technical leadership for the nation's measurement and standards infrastructure. ITL develops tests, test methods, reference data, proof of concept implementations, and technical analysis to advance the development and productive use of information technology. ITL's responsibilities include the development of technical, physical, a...

An increasing problem of ageing cable insulation requires a development of certain methods for online conditioning and offline assessment. Thus, Partial Discharge (PD) monitoring is the most effective technique for assessment of insulation condition. PD monitoring and analysis has become imperative for utilities as well as for equipment manufacturers as it causes deterioration of insulation sys...