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Heat Block
GW5 isolating switch heating defect analysis and its countermeasures-GW5, isolation switch - Electri
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Abstract: This article series is now used GW5 Isolating switch Heat defects were analyzed, and described the countermeasures to eliminate overheating defect. In the meantime, we need constantly improve the management, to formulate strict rules and regulations, to prevent isolation switch fever caused by the occurrence of power outages.
GW5 series isolation switch is outdoor rated frequency 50HZ High Voltage Apparatus Equipment for High pressure Line in a voltage change under no load connected, as well as by maintenance of high voltage bus, circuit breakers, etc. Electric Equipment and high voltage electric lines for electrical isolation purposes; also be used for division and a small capacitive current or inductor current. GW5 series isolation switch has a simple structure, reliable performance, size range, installation flexibility and wide scope of application, versatility, and easy maintenance during operation, power system has been widely used in the network has very important position. However, experience over the years many advantages GW5 series isolation switch, but also to realize the heating electrical circuit problems seriously affect the safety and stability of power system economic operation, must pay great attention.
1, the early diagnosis of thermal defects
Fully understand and master isolation switch actual site of thermal defects, the severity of the various parts of fever, the development trend of thermal defects and other factors is very important. Can be learned through the survey, GW5 thermal defects isolating switch contacts in contacts, wiring Block, and other parts of the left contact. The overheating is not significant in the early defects, but the heavy load at high temperature under harsh conditions will quickly develop into endanger the safe operation of critical network defects. Therefore, a good early diagnosis is especially important. Operating personnel can be rainy and snowy weather and morning visits to observe the conductive parts of the rain, snow, frost, etc. early diagnosis, but also the color of paint can change color or to use test the temperature wax test, the most reliable method is infrared thermometer device with a quantitative test.
Traditional defect detection method of heat-switch connector: The frost-day observation joints, temperature paste wax, paint color, these three methods has its own limitations, in fact, a large part of equipment heat detection is also limited to the naked eye. Infrared detection by measuring the surface temperature of electrical equipment, using non-contact method to measure the equipment condition, effectively controlling the heat-switch defects in development. Therefore been widely welcomed by operating personnel.
Thus, the application of infrared temperature measurement, can be found from a fever early in advance of the heat-switch defects, which can monitor and control the development of defects.
Based on past experience found that some parts of fever is indeed caused by its own defects, and some parts of the adjacent parts of overheating is caused by heat conduction. Block wiring connections within the software such as overheating can be made by heat conduction and convection heating Block wiring, if not to a comparative analysis of the temperature of the two, we can not accurately determine the exact location of fever. This phenomenon often occurs in about contacts, etc., so the use of infrared temperature measurement point Wenyi, the instrument function should be set in "real time temperature" position and align the measured slow-moving objects, find the highest temperature point , and then analyze and compare the diagnosis, to find out the real position of fever. To make early diagnosis of thermal defects, in addition to the direct use of Judgement. Infrared temperature data should also be a comparative analysis of different parts of the same equipment, different phases between the different devices on the same site, between the same phase, the same parts in different time to be a comparative analysis between the data and then use " Charged Device Technology Infrared Diagnosis Guide "recommended method to judge the relative temperature difference types of thermal defects in the accurate characterization and classification.
2, overheating causes of defects
Running the actual show that the switch has a diversion most part exposed to the air by wind and rain, easy to aging, corrosion and heat defects, such as conductive fault zone, showing Knife exist at both ends of a hat office hot Knife touch refers to the aging of deformation caused by blade spring fever, Knife in the joints due to rust or crimp connectors do not actually result in fever, etc..
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A scientist adds 1200 calories of heat to a 200-g block of ice at 0 degrees Celsius. What amount of ice melts?
A scientist adds 1200 calories of heat to a 200-g block of ice at 0 degrees Celsius. What amount of ice melts?
Could you give me the formula and work it out? Because right now I'm clueless
And it's the ice that's at 0 degrees not the 1200 calories
Latent heat of melting ice at NTP is 80 cal /g.
Hence 1200/80=15 g ....[ANS.]
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