Digital ray imaging voltage sensor

Abstract

The invention relates to a digital ray imaging voltage sensor based on the principle and the ray imaging technique of the electric field force (voltage) upon the charged particles. A vacuum glass is arranged between voltage polar plates; an isotope ray source positioned in the vacuum glass emits an alpha or beta charged particles to bombard scintillation optical fibers to flash; the scintillation optical fibers are uniformly and horizontally arranged from up to down and from left to right, wherein the upper end of the scintillation optical fibers is fixedly provided with a reflecting film for reflecting photons; the lower end is connected with an image intensifier. The photons emitted by the scintillation optical fibers are transmitted to the image intensifier for amplifying through the same optical fiber, and then are subjected with signal processing photo through the image sensor. The voltage to be measured is connected with the voltage polar plate; and the driving force of the electric field force between the polar plates upon the charged particles can change the moving track of the particles. When bombarding the scintillation optical fibers at different positions, the corresponding lighting positions can be changed; the changing amount is in proportion to the amplitude of the electric field force (voltage); and the change of the lighting position is detected by adopting a digital image processing method to obtain the real time digital voltage signal. The measuring method of the invention is linear, high in level without power, so the method is suitable for the measurement of the alternating and direct current voltage of a power system.

Description

technical field [0001] The invention relates to a digital radiographic imaging voltage sensor, which is suitable for the measurement of AC and DC voltages of power systems based on the action principle of electric field force (voltage) on charged particles and radiographic imaging technology. Background technique [0002] At present, there are four types of voltage transformers or sensors that can be used for high voltage measurement: electromagnetic type, capacitive type, analog photoelectric type and active electronic type. [0003] The outstanding problems of electromagnetic voltage transformer in the application of ultra-high voltage and ultra-high voltage power system are its high electrical insulation cost and low reliability. Taking into account the requirements of safety, reliability, accuracy, cost performance, etc., electromagnetic voltage transformers are not suitable for high voltage levels. [0004] Capacitive voltage transformers are based on the principle of ...

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Problems solved by technology

Its advantage is to realize the optical isolation between high and low potentials, but the disadvantage is that the method of light intensity measurement is nonlinear, and is seriously affected by stress birefringence, the measurement range is small, and the reliability is poor

[0006] The active electronic type uses a capacitive voltage divider, a resistive voltage divider or an inductive voltage divider to obtain a small voltage signal. The disadvantage is that the electrical isolation between high and low potentials is not realized.

[0007] The common disadvantage of the above transformers is that only analog voltage signals can be obtained on the low-voltage side, and digital signals need to be obtained by means of analog-to-digital conversion circuits, which has become an obstacle to the full digitalization of substations.

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