Garnacho Fernando, Khamlichi Abderrahim, Rovira Jorge
Laboratorio Central Oficial de Electrotecnia (LCOE), Fundación para el Fomento de la Innovación Industrial (FFII), c/Eric Kandel, 1, 28906 Getafe, Madrid, Spain.
Sensors (Basel). 2017 Nov 17;17(11):2657. doi: 10.3390/s17112657.
The most important advantage of voltage dividers over traditional voltage transformers is that voltage dividers do not have an iron core with non-linear hysteresis characteristics. The voltage dividers have a linear behavior with respect to over-voltages and a flat frequency response larger frequency range. The weak point of a voltage divider is the influence of external high-voltage (HV) and earth parts in its vicinity. Electrical fields arising from high voltages in neighboring phases and from ground conductors and structures are one of their main sources for systematic measurement errors. This paper describes a shielding voltage divider for a 24 kV medium voltage network insulated in SF6 composed of two resistive-capacitive dividers, one integrated within the other, achieving a flat frequency response up to 10 kHz for ratio error and up to 5 kHz for phase displacement error. The metal shielding improves its immunity against electric and magnetic fields. The characterization performed on the built-in voltage sensor shows an accuracy class of 0.2 for a frequency range from 20 Hz to 5 kHz and a class of 0.5 for 1 Hz up to 20 Hz. A low temperature effect is also achieved for operation conditions of MV power grids.
分压器相对于传统电压互感器最重要的优势在于，分压器没有具有非线性磁滞特性的铁芯。分压器对于过电压具有线性特性，并且在较宽的频率范围内具有平坦的频率响应。分压器的弱点在于其附近外部高压（HV）和接地部件的影响。相邻相中的高电压以及接地导体和结构产生的电场是其产生系统测量误差的主要来源之一。本文描述了一种用于24 kV SF6绝缘中压网络的屏蔽分压器，它由两个电阻 - 电容分压器组成，一个嵌套在另一个内部，对于变比误差，在高达10 kHz的频率范围内实现平坦的频率响应，对于相移误差，在高达5 kHz的频率范围内实现平坦的频率响应。金属屏蔽提高了其对电场和磁场的抗扰度。对内置电压传感器进行的特性表征表明，在20 Hz至5 kHz的频率范围内精度等级为0.2，在1 Hz至20 Hz的频率范围内精度等级为0.5。对于中压电网的运行条件，还实现了低温效应。
