针对煤矿瓦斯抽放监控系统中瓦斯管道设备及其相关联的电源和通信接口必须满足“ia”安全防爆等级要求,在现有“ib”防爆等级的煤矿瓦斯抽放监控系统基础上,通过增加一种安全等级转换接口对瓦斯管道设备进行了升级改造.详细介绍了具有梯形输出特性的阻性限流的电源转换原理和具有线性输出特性的阻性限流的信号转换原理,并对关键元件的相关参数进行了分析及计算.测试结果表明,该转换接口具有转换效率较高、频率失真小等特点,输出特性满足“ia”安全防爆等级要求.%According to requirements that gas pipeline equipments and its associated power supply and communication interface must satisfy the "ia" safety explosion-proof grade in mine gas drainage monitoring system,the gas pipeline equipments can be upgraded by increasing an explosion-proof grade conversion interface based on current mine gas drainage monitoring system with the "ib" explosion-proof grade.Power conversion principle with resistive current limiting and trapezoidal output characteristics,and signal conversion principle with resistive current limiting and linear output characteristics were introduced in detail.Related parameters of key components were analyzed and calculated.The test results show that the conversion interface has the characteristics of high conversion efficiency and low frequency distortion,and its output characteristics meet the "ia" safety level requirements.
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