Abstract
The stability of the optical electric field sensor (OEFS) in actual operation is affected by environmental factors such as temperature and SF6 (sulfur hexafluoride). To analyze the operational environment parameters affecting the optical properties of crystals, a thermodynamic model of the OEFS in which the optical properties of the crystal are changed by the first-order effects and the second-order effects was established. The intensity parameters such as electric, stress and temperature fields were introduced. The theoretical analysis results show that under temperature, stress and electric field conditions, the optical properties of the sensing crystals are no longer changed only by the electro-optic effect, but also by the temperature and the stress fields. Further synthesis suggests the expected optical property changes under the effect of the environment fields. OEFS tests show that the accuracy of OEFS is dependent on temperature with a ratio error of −0.8%~1.5% in the temperature range from −25 °C to +40 °C.
Highlights
In any further study of the stability of Passive electronic voltage transformers (PEVTs), the sensor must be seen as a system that can respond in many ways to a series of environmental fields
optical electric field sensor (OEFS) based on bismuth germinate (BGO) crystals are a common research subject [12,13], and their basic principle of operations is known as the linear electro-optic effect
The nature of OEFS is that an external electric field changes their optical properties
Summary
Passive electronic voltage transformers (PEVTs) based on the principle of the electro-optic effect have bright prospects in high voltage grade applications because of a series of advantages they display such as their wide measuring range, good frequency characteristics, a simple insulation structure and higher safety [1,2,3]. At present PEVTs can’t be widely applied in power systems, mainly because the long term running stability of the optical electric field sensor (OEFS) cannot meet the power grid requirements. There have been many studies aimed at improving the stability of OEFS, such as employing software compensation or using a double optical path structure to improve the temperature performance of OEFS [4,5,6,7,8,9]. In the 1990s, Lee improved the temperature stability of OEFS from ±7.0% to ±0.75% within −2 °C~65 °C with dual light path compensation [10]. In actual operation the electro-optic sensing crystal of the OEFS interacts with the electric field to be tested, and with the temperature field and stress field. The electric, temperature and stress fields can change the optical properties of electro-optic crystals. In any further study of the stability of PEVT, the sensor must be seen as a system that can respond in many ways to a series of environmental fields
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