Direct current thawing apparatus with special rectiformer and protection method thereof
A rectifier transformer and DC ice-melting technology, which is applied to the installation of automatic disconnection emergency protection devices, circuit devices, cables, etc., can solve the problems of less time, complicated equipment and wiring, and an annual utilization rate of less than 5%. Achieve the effect of low cost, ingenious design and complete protection functions
Active Publication Date: 2012-09-26
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology
[0006] (2) The direct current ice melting device operates in the ice melting condition for very little time each year, and the annual utilization rate is less than 5%.
But so far, it has not been used to melt ice on actual lines
The AREVA company’s solution must be equipped with special sorting transformers, AC filters, smoothing reactors, DC filters and wave traps, and the equipment and wiring are complex; without this solution, the wiring is simple and has little impact on the harmonics of the system, so it does not need to be configured Advantages such as filter banks
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[0027] The present invention proposes the arrangement of measurement points of the DC deicing device with a special rectifier transformer as follows: figure 1 As shown, it includes AC side power supply circuit breaker QF, isolating knife switch K, rectifier transformer, valve side current transformers Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc, a 12-pulse converter, DC side voltage positive mutual inductance Udp, DC-side negative voltage transformer Udn, DC-side positive current transformer Idp, DC-side negative current transformer Idn, DC-side grounding current transformer Idgnd, DC-side knife switches S1, S2, S3 and S4, of which the valve side One end of the current transformers Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc is connected to the power supply through the isolation switch K and the AC side power supply circuit breaker QF, and the other end of the valve side current transformers Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc One end is connected to the twelve-pulse converter, one si...
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The invention relates to a direct current thawing apparatus with a special rectiformer and a protection method thereof. The direct current thawing apparatus with the special rectiformer comprises an alternating current side power supply circuit breaker QF, an isolating disconnect switch K, a rectiformer, valve side current transformers Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc, a 12-pulse converter, a DC-side positive voltage mutual inductor Udp, a DC-side negative voltage mutual inductor Udn, a DC-side anode current mutual inductor Idp, a DC-side cathode current mutual inductor Idn, a DC-side grounding current mutual inductor Idgnd, and direct current side knife switches S1, S2, S3 and S4. The direct current thawing apparatus has the advantages of reasonable design, low investment and low cost. The protection method ensures the direct current thawing apparatus to satisfy the demand of safe and quick thawing in all circuits, and lowers the investment into the direct current thawing apparatus. The invention has the advantages of ingenious design, favorable performance, low investment, complete protection functions, convenience and high practicality.
Description
technical field [0001] The invention relates to a DC deicing device with a special rectification transformer and a protection method thereof, and belongs to the innovative technology of the DC deicing device with a special rectification transformer and a protection method thereof. Background technique [0002] The power grid is an important infrastructure and public utility that is related to national energy security and the lifeline of the national economy. It undertakes the major responsibility of providing important energy security for economic and social development and the national economy and people's livelihood, and promoting sustainable economic and social development. With the continuous improvement of the level of modernization, the whole society relies more and more on electricity, and higher requirements are placed on the quality of electricity supply. [0003] The icing of transmission lines caused by low temperature, rain, snow and freezing weather is one of th...
Claims
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IPC IPC(8): H02G7/16H02H3/26H02H3/04
Inventor 傅闯黎小林饶宏许树楷赵杰李立浧吴怡敏
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD