| 电气火灾探测器信号输出方式 |
| 添加时间：2018/7/11 14:32:50 浏览次数： |
| 电气火灾探测器信号输出方式 Signal output mode of electric fire detector 外置式剩余电流互感器的信号输出方式有两种：“直接输出方式”和“变换输出方式”。 There are two ways to output the external residual current transformer: "direct output mode" and "transform output mode". 直接输出方式与C.T一样，在无源状态下工作，输出是50Hz的工频信号。为获得较高的输出电平，互感器二次线圈匝数很多，因而输出阻抗较高，传输过程易受干扰。除非采用性能良好的屏蔽手段，否则在配电室内强而复杂的电磁环境里，超过5米的传输距离将可能使信号受到严重干扰，以至不能反映真实的剩余电流。 Like the C.T, the direct output mode works in passive state, and the output is the 50Hz power frequency signal. In order to get higher output level, the number of turns of the two coils of the transformer is large, so the output impedance is high, and the transmission process is easily disturbed. Unless a good shielding method is used, in a strong and complex electromagnetic environment of the distribution room, the transmission distance of over 5 meters may cause the signal to be seriously disturbed, so that the real residual current can not be reflected. 变换输出方式一般是有源的（由探测器提供电源），输出是直流信号或载波信号。互感器内部含有线性变换电路（或变换元件，如霍尔传感器等）和放大、校正、调零电路，可以做到较高的输出电平和较低的输出阻抗。变换输出方式的性价比高，在配电室内用一般的导线传输距离可达50米，信号畸变小于1%。 The transform output mode is generally active (supplied by the detector), and the output is DC or carrier signal. The transformer contains linear transform circuits (or transform elements, such as Holzer sensors, etc.) and amplifying, correcting and zeroing circuits, which can achieve higher output level and lower output impedance. The conversion output mode has high cost performance, and the transmission distance can reach 50 meters in the distribution room, and the signal distortion is less than 1%. |
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