现行《安全火花型防爆电气设备制造检验暂行规定》(简称《暂行规定》)中规定,电路在正常状态下安全系数为2,在故障状态下安全系数为1.5。安全系数是检验一种电路系统是否是安全火花电路的重要尺度。通常由增加被试电路的电流或电压来提供安全系数是较为合适的。但是绝大多数电路系统采用这样的办法是困难的。例如:稳压电源、恒压变压器以及有调谐电路的高频电路等等。特别 The current “Provisional Regulations on the Inspection of Manufacturing Safety Spark-proof Electrical Equipment” (“Provisional Regulations”) provides that the safety factor of the circuit under normal conditions is 2 and the safety factor under conditions of fault is 1.5. Safety factor is to test whether a circuit system is an important measure of safety spark circuit. It is usually appropriate to provide a safety factor by increasing the current or voltage of the circuit under test. However, the vast majority of circuit systems using this approach is difficult. For example: power supply, constant voltage transformers and tuned circuit of high-frequency circuits and so on. especially