最大电流保护在地下电网中的应用效率。

KALYNYCHENKO V.
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引用次数: 0

摘要

本文考虑在井下矿井电网中采用最大电流保护,使绝对值大于大功率电动机起动电流的短路电流失效。经确定,这些保护措施有若干缺点。本文揭示了具有电流-时间特性的保护比最大电流保护更完善,但在电弧短路的情况下,其绝对值可以小于启动值,保护启动时间明显超过允许值。采用电流和电压对称分量滤波器的保护降低了对连接负载的两相短路的灵敏度,在发生短路时,三次谐波水平的保护具有有限的作用范围,并且需要重复。研究表明,使用阀门转换器和晶闸管方案来控制地下网络中的提升装置和输送机的驱动,高次谐波电流的水平增加。国内外企业的工作实践证明,作为补偿无功功率而安装的电容器组具有过流和短路电流的保护作用,但在非正弦电压下,由于高次谐波过载,在许多情况下会迅速失效。文章指出,随着地下管网发动机功率的增大和气隙不对称的表现,所给出的高次谐波超过允许值。因此,本文提出了矿井配电网、地下电网和电力设施保护系统建设的发展方向
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Efficiency of application of maximum current protection in underground networks.
The article considers the use of maximum current protection in underground mine electrical networks, which disables short-circuit currents with an absolute value greater than the starting currents of powerful electric motors. It was determined that these protections have a number of disadvantages. The article reveals that the protection with the current-time characteristic is more perfect than the maximum current protection, but in the case of arcing short circuits, the values of which can be less than the starting ones in absolute value, the protection activation time significantly exceeds the permissible value. Protection with filters of symmetrical components of currents and voltages reduces the sensitivity to two-phase short circuits with a connected load, protection at the level of the third harmonic in the event of a short circuit has a limited range of action and requires duplication. It was investigated that with the use of valve converters and thyristor schemes for controlling the drives of lifting installations and conveyor transport in underground networks, the level of higher harmonic currents increased. In the practice of work of domestic and foreign enterprises, it has been proven that capacitor banks, which are installed to compensate for reactive power, have protection against overcurrents and shortcircuit currents, but with non-sinusoidal voltage, in a number of cases, they quickly fail because they are overloaded with higher harmonics. The article shows that with the increase in the power of the engines of the underground district networks and the manifestation of the asymmetry of the air gap, the higher harmonics given exceed the permissible values. Therefore, the article presents the most promising directions for the construction of systems for the protection of mine distribution underground networks and electrical installations
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