文献翻译
A New Design of Mine Selective Leakage Protector Based on Advanced RISC Machine Cortex-M3
Abstract:
Traditional leakage protection schemes are difficult to detect and isolate the leakage fault accurately. A reliable and flexible solution for leakage fault protection with selective has being looked for. According to the shortages of protection systems used in ungrounded low-voltage distribution networks currently, a new design of selective leakage protection is put forward. The action criteria of the design which are based on additional DC power supply and direction of zero-sequence power are proven to be very effective to leakage fault, both theoretically and practically. The selective leakage protection which should have no time difference and more accurate action for underground low-voltage distribution networks can be realized. In this paper, we use STM32F103R8 processor of ARM CortexM3 family as the core control chip and micro;C/OS - II embedded operating system. This paper focuses on the hardware and software design.
copy; 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011] Open access under CC BY-NC-ND license.
1. Introduction
Leakage fault will cause a lot of accidents, such as electric shock, gas and coal dust explosion and electrical fire, is a major fault of mine which takes about 70% of all mine electrical faults. Leakage protection is a very important. So leakage protector must be installed in the underground low-voltage networks [1]. In the 21st century, with the increasing power of underground mining equipment and the increasing level of integrated mechanization, supply voltage of mine has stepped up from 380V to 3300V. Recently large-capacity substation equipment of 630KVA, 1000KVA and 2500KVA has been put into use.The risk of electric shock and explosion and electrical fire increases greatly. Therefore, a good selective protection scheme is required.
The existing selective leakage protection principles are mostly based on the direction of zero-sequence power principle [2], [3], [4], it solves the shortcomings existed in the protections which are based on zerosequence voltage principle, zero-sequence current principle and zero-sequence current direction principle [5], [6], such as instability of resistance measurements, no response etc. Many of the protectors are based on the outdated MCU like 80C51 [2]. The sampling is slow and inaccurate, reaction is insensitive. There are also some protectors based on ARM7 and DSP [4], the effect is good, but one shortage is the cost. So we choose Cortex-M3 to achieve a good effect and reduce costs as much as possible.
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