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CN202433445U 电网系统低压直流电源对地电容在线测量仪 失效 - 权利终止 转让

电网系统低压直流电源对地电容在线测量仪
摘要：
电网系统低压直流电源对地电容在线测量仪，属于电工学领域，用于在线测量电网系统低压电源正负极对地的电容Cx，运算放大器N3接成差分放大器，集成电压比较器电路N4和N5接成窗口电压比较器电路，集成电路N6接成双稳态电路，集成电路N7接成晶体振荡电路，测量时，把P1和P3点分别接到待测低压电源的正负极，P2点接电网地线，按动按钮开关K1，则Cx可由下式给出：Cx(μF)＝0.35Δt21/lg(U1/U2)，其中U1、U2分别是电位器Rp2、Rp3中间抽头对仪器地线的电压，Δt21＝0.1x计数器JSQ的读数，Cx的单位是微法。
摘要（英）：

The utility model relates to an online measuring instrument for ground capacitance of a low voltage direct current power supply of a grid system, belonging to the field of electrotechnics. The measuring instrument is used to measure the ground capacitance Cx of positive and negative poles of the low voltage direct current power supply of the grid system online. An operational amplifier N3 is connected with a differential amplifier, integrated voltage comparator circuits N4 and N5 are connected with a window voltage comparator circuit, an integrated circuit N6 is connected with a bistable circuit, and an integrated circuit N7 is connected with a crystal oscillating circuit. During measurement, points P1 and P3 are respectively connected to the positive and negative poles of the low voltage power supply to be tested, point P2 is connected with a ground wire of the grid system, and a button switch K1 is pressed, so that Cx can be given by the following formula: Cx(muF)=0.35deltat21/1g(U1/U2), wherein U1 and U2 are respectively the voltages of potentiometers Rp2 and Rp3 center taps to the ground wire of the instrument, deltat21 is equal to 0.1 multiplied by a numerical reading of a counter JSQ and unit of Cx is microfarad.

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