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首页> 外文会议>Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Proceedings >An evaluation of diagnostic techniques relevant to arcing fault current interrupters for direct current power systems in future aircraft
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An evaluation of diagnostic techniques relevant to arcing fault current interrupters for direct current power systems in future aircraft

机译：对未来飞机直流电源系统的电弧故障电流断续器相关诊断技术的评估

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Arc fault circuit interrupters (AFCI) are a relatively new development in the area of circuit protection. Typical circuit breakers are designed to detect an overload current in the protected circuit and trip open within a specified period of time. The AFCI is a device that detects and interrupts an arcing fault when it occurs. An arc fault is a dangerous situation with very high temperatures in the arc. These high temperatures are sufficient to ignite wire insulation and other combustibles in the vicinity of the arc. Standard circuit breakers and ground fault circuit breakers generally will not trip in the event of an arc fault since there is sufficiently high impedance in the circuit to limit current below the trip level of its characteristic curve. Numerous arc faults that have been observed on aging aircraft, due to failing insulation, have spurred an interest in AFCIs for both commercial and military aircraft. Such AFCIs assess the AC current waveform to distinguish that an arc is occurring in the circuit. When this occurs, the AFCI will open to mitigate damage to the wiring system. In the AC case, the opening device will generally take advantage of the natural current zero in the AC wave form to clear the circuit. Protective devices for DC systems cannot exploit this characteristic. In addition, the charge transport properties (conductivity) of the DC arc are affected by the gas density (i.e., altitude) surrounding the arc. This paper presents experimental results intended to help evaluate the potential applicability of the typical diagnostics used in AC AFCIs as a valid means of detecting a series DC arc. This is particularly relevant to future aircraft power systems employing 270 Volt DC distribution. Also, these DC arcs have been characterized at low atmospheric pressures to simulate high altitude operation.
机译：电弧故障电路断续器（AFCI）在电路保护领域是一个相对较新的发展。典型的断路器设计为检测受保护电路中的过载电流，并在指定的时间内跳闸断开。 AFCI是一种能够在发生电弧故障时检测并中断电弧故障的设备。电弧故障是非常危险的情况，电弧温度很高。这些高温足以点燃电弧附近的电线绝缘层和其他可燃物。在发生电弧故障时，标准断路器和接地故障断路器通常不会跳闸，因为电路中存在足够高的阻抗以将电流限制在其特性曲线的跳闸水平以下。由于绝缘故障，在老化的飞机上已观察到许多电弧故障，这引起了民用和军用飞机对AFCI的兴趣。这样的AFCI会评估AC电流波形以区分电路中是否发生了电弧。发生这种情况时，AFCI将打开以减轻对布线系统的损坏。在交流情况下，断开装置通常会利用交流波形中的零自然电流来清除电路。直流系统的保护设备无法利用此特性。另外，DC电弧的电荷传输性质（导电性）受到电弧周围的气体密度（即高度）的影响。本文提出的实验结果旨在帮助评估AC AFCI中使用的典型诊断程序作为检测串联直流电弧的有效手段的潜在适用性。这与采用270伏直流配电的未来飞机动力系统特别相关。同样，这些直流电弧的特征是在低气压下模拟高海拔运行。

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