Simple optical transformer system for intense electric field and voltage sensing

Abstract

This paper presents a quite simple and efficient optical transformer system for high-voltage measurements. Compact and concise electrooptic sensors measure intense electric fields emitted from 50 kV of a spherical surface. We present two distinct types of optical sensors, one suitable for contacting and the other suitable for non-contacting sensing geometry. The properties of each sensor, including the design, operation principle, linearity and sensitivity, for intense electrical signals are discussed. The voltage sensing capability of the proposed optical transformer, from the measured electric fields, was evaluated and calibrated in a field simulation based on a finite element method and by a commercial potential transformer.

Simulation and Test of a Contactless Voltage Measurement Method for Overhead Lines Based on Reconstruction of Integral Node Parameters

“…As for the three-phase overhead line experiment platform adopted in the experiment, the reconstruction factor k equals to 0.875 through the aforementioned calculating method. The weights and node position of interval L1 and L2 after the node reconstruction through the Formulas (4)- (10) are shown as Table 2. It can be seen that the E-field information is concentrated in a small area under the wire.…”

“…J. Firth et al [9] developed a new optical liquid crystal E-field sensor, which can improve the measurement accuracy to 1% even though the strong E-field reaches 380 kV/m. Optical crystal sensors are used in a variety of materials and structures, and have good output response characteristics [10][11][12][13]. However, due to the high precision of the terminal, some performance characteristics are susceptible to the complex application scenarios.…”

A Highly Sensitive and Miniature Optical Fiber Sensor for Electromagnetic Pulse Fields

“…Another method is called electro-optic modulation, which includes active electro-optic modulation and passive electro-optic modulation. This method adopts optical fibers for transmitting optical signals converted by the electro-optic modulation circuit, which eliminates the influence of a coaxial cable [3][4][5][6][7][8][9][10]. For active electro-optic modulation, i.e., the method adopted by this article, the electrically smaller antenna was utilized to induce external EMP; generally, an electric field test uses an electric dipole antenna, and the magnetic field test uses a magnetic small ring antenna.…”