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在《内燃机车》1979年第4期的“电感性电器的感应电势及对电子装置的影响”一文中,曾简单地介绍过用MY31型压敏电阻(浪涌吸收器)抑制线路中瞬间过电压的方法,也曾提到,关于使用寿命问题,还有待于做长期考验。几年来,装在东方红型内燃机车上的压敏电阻,对抑制瞬间过电压取得了较好的效果。但是,也发生了一些问题。主要表现为寿命较短,在环境温度较高的非洲和昆明地区,更加突出。根据几年来的运用情况,有必要对压敏电阻的使用再做以下几点补充说明。1.压敏电阻标称电压值(V_(1mA)值)的选取关于压敏电阻标称电压值(V_(1mA)值)的选取问题,在前面提到的文章中介绍的方法是:“标称电压值的90%还要高于电源电压的上限值”。当时根据这个方法,我们选用了标称电压为140伏的压敏电阻,用在电源电压为直流
In “Diesel Locomotive” No. 4 of 1979 “inductive electrical potential and the impact of electronic devices,” a article, has briefly introduced the use of MY31-type varistor (surge absorber) to suppress the line transient The voltage method, it was also mentioned, has to be done in the long term to test the useful life. Over the past few years, mounted on the East Red diesel locomotive varistor, inhibit the transient over-voltage achieved good results. However, some problems have also occurred. Mainly for the short life expectancy, in the higher ambient temperature in Africa and Kunming, more prominent. According to the use of the past few years, it is necessary to use the varistor do the following additional instructions. 1. Selection of Varistor Nominal Voltage (V_ (1mA)) Regarding the selection of varistor nominal voltage (V_ (1mA)), the method described in the article mentioned above is “ 90% of the nominal voltage value is higher than the upper limit of the power supply voltage ”. At that time according to this method, we use a nominal voltage of 140 volts varistor, used in the power supply voltage for the direct current