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提出了一种利用发光二极管(LED)电致发光(EL)效应的光电式电压传感器,其传感单元仅由一个电阻器和两个LED组成。被测交流电压施加于一个高阻值(例如100 MΩ)的电阻器,产生μA级的泄漏电流并驱动两个LED发光,用两根塑料光纤将此光强传输至光电探测器,则通过测量光强度即可获知被测电压。选用阻值约为100 MΩ的电阻器,在室温条件下实验测量了0.2~5.5kV的工频电压,传感器输出与被测电压有效值之间存在较好的线性关系,其非线性误差低于3.1%。同时,提出并实验验证了一种利用两路光传感信号实现电压传感器输出随温度漂移的补偿方法,在5.5kV的被测电压范围及-40~+60℃的温度范围内,补偿后传感器输出的温度漂移约为±2.1%。本文的光电式电压传感器不需要额外光源,并具有结构简单、成本低等优点。
A photoelectric voltage sensor using electroluminescence (EL) effect of light emitting diode (LED) is proposed, in which the sensing unit consists of only one resistor and two LEDs. The measured AC voltage is applied to a high resistance (eg 100 MΩ) resistor to create a μA leakage current and drives the two LEDs to emit light with two plastic optical fibers transmitting the light to the photodetector. By measuring Light intensity can be measured voltage. The resistor of about 100 MΩ is selected to measure the power frequency voltage of 0.2-5.5 kV at room temperature. The linear relationship between the output of the sensor and the measured RMS voltage is good. The nonlinear error is less than 3.1%. At the same time, a compensation method of voltage sensor output with temperature drift using two photo-sensing signals is proposed and experimentally verified. After the voltage of 5.5kV is measured and the temperature range of -40 ~ + 60 ℃, the compensated sensor The output temperature drift is about ± 2.1%. This photoelectric sensor does not require additional light source, and has the advantages of simple structure, low cost.