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§4 本安电气设备设计基础一、正确选用参考曲线本质安全电路的电气参数选择应在国家标准(GB3836.4—83)规定的本质安全允许值以下,并保证电路在正常接通或断开以及在事故状态(如短路、接地等)时所产生的电火花或高温,都不会点燃可燃性混合物。从实质性来讲,本质安全电路就是对电路的能量加以限制,最简单、最有效的方法就是根据GB3836.4—83中所提供的<附录A 最小点燃电流、电压曲线>图1～图3、图5～图7,来对本质安全电路从整体上进行设计计算。在实际电路中,由于电压有波动;电阻值有正、负偏差;电阻为有感或无感等诸种原因,因此理想的设计计算与样机的实际电路参数还存在一些差异,这样最终设计方案合格与否,一定要采用符合IEC一79—3火花试验装置来进行试验,并以国家指定的检
§ 4 intrinsically safe electrical equipment design basis First, the correct choice of reference curve The intrinsically safe circuit of the electrical parameters should be selected in the national standard (GB3836.4-83) the provisions of the intrinsically safe allowable value below and ensure that the circuit is connected or disconnected in the normal As well as electrical sparks or high temperatures generated during an accident (such as short circuiting, grounding, etc.), do not ignite the flammable mixture. In essence, the intrinsically safe circuit is to limit the energy of the circuit, the simplest and most effective way is based on the GB3836.4-83 provided Figure 1 ~ Figure 3 , Figure 5 ~ Figure 7, to the intrinsically safe circuit from the overall design and calculation. In the actual circuit, the ideal design calculation and the actual circuit parameters of the prototype there are some differences, so the final design of the program because of voltage fluctuations; positive and negative resistance values; resistance is felt or no sense of other reasons Qualified or not, we must use in line with IEC a 79-3 spark test device for testing and national inspection