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DC de-icing device without special rectifier transformer and protection method thereof

A rectifier transformer, DC ice melting technology, applied in the direction of automatic disconnection emergency protection device, circuit device, cable installation, etc., can solve the problems of less time, less than 5% annual utilization rate, complicated equipment and wiring, etc. Achieve the effect of low cost, ingenious design and complete protection functions

Active Publication Date: 2010-11-10
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 finishing transformers, AC filters, smoothing reactors and DC filters (wave traps), and the equipment and wiring are complicated; none of them have the advantages of simple wiring and little impact on the harmonics of the system. Advantages such as no need to configure filter banks

Method used

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  • DC de-icing device without special rectifier transformer and protection method thereof
  • DC de-icing device without special rectifier transformer and protection method thereof
  • DC de-icing device without special rectifier transformer and protection method thereof

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Embodiment

[0027] The power supply of the DC deicing device of the present invention can be directly taken from the generator (or generator car), but more is taken from the AC power grid, and the rated output voltage of the commonly used mobile generator car is 0.4kV, and what the AC power grid provides can be used as a direct current The ice melting power supply voltage mainly includes 35kV, 10kV, 6kV and 0.4kV. Table 1 shows the ice-melting lengths of various types of wires determined by the valve-side voltage of the converter, and Table 2 shows the ice-melting lengths of various types of wires determined by the capacity of the DC ice-melting device. It can be seen from Table 1 that when 35kV and 10kV are directly used as the valve side voltage, the effective ice-melting distance can meet the ice-melting requirements of various typical lines. From Table 2, the 35kV and 10kV side capacities of typical transformers can also meet the ice-melting requirements of various typical lines. need...

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Abstract

The invention relates to a DC de-icing device without a special rectifier transformer and a protection method thereof. The DC de-icing device without the special rectifier transformer comprises a AC-side power supply circuit breaker QF, an isolator K, valve-side current mutual inductors Iva, Ivb and Ivc, a current converter, DC-side voltage mutual inductors Udp and Udn, DC-side current mutual inductors Idp and Idn and DC-side disconnecting links S1, S2, S3 and S4. The DC de-icing device has reasonable design, less investment and low cost. The protection method of the DC de-icing device without the special rectifier transformer can ensure that the DC de-icing device satisfy the safe and rapid de-icing requirements of different roads and can reduce the investment of the DC de-icing device. The DC de-icing device has ingenuous design, excellent performance, low investment, complete protection functions, convenience and practicability.

Description

technical field [0001] The invention relates to a DC ice-melting device without a special rectifier transformer and a protection method thereof, belonging to an innovative technology for DC ice-melting application of transmission lines of a transmission network. 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 the serious threats f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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