Abstract
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.
Highlights
The characterization performed on the built-in voltage sensor shows an accuracy class of 0.2 for a frequency range from
High-voltage (HV) dividers are a good alternative to traditional voltage transformers for power frequency measurements on medium- and high-voltage power lines [1,2]
The international standards [4,5] evolved in recent years require measurements in frequency ranges up to 5 kHz
Summary
High-voltage (HV) dividers are a good alternative to traditional voltage transformers for power frequency measurements on medium- and high-voltage power lines [1,2]. ToTo date, high voltage resistive dividers have not not beenbeen usedused in electrical networks as voltage voltage transfer devices. At first, this was due to the power supply requirements of voltmeters, transfer devices. 50 kV for coordination power frequency voltage) lightning impulses and 50performances kV for power(afrequency maintaining its technical performances maintaining its technical class of 0.2voltage) from 20 Hz up to 5 kHz) This prototype opens a practical industrial approach to the practical industrial approach to the on-line monitoring of power quality and to knowledge of grid on-line monitoring of power quality and to knowledge of grid overvoltages (temporary, switching, overvoltages (temporary, switching, and lightning) to be supported by the grid components (powerand lightning) to besurge supported by the gridetc.).
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