Novel portable flexible fiber current measuring analyzer

Abstract

The invention provides a novel portable flexible fiber current measuring analyzer. The analyzer comprises a flexible sensing head and a cabinet, the flexible sensing head comprises first and second sensing fibers, the first sensing fiber is arranged in the inner side of the second sensing fiber, and the first and second sensing fibers are wound into a ring synchronously and coupled and connected by a 1 / 2 lambda waveplate, and a current bus is arranged in the center of the ring; one end of the first sending fiber and one end of the second sensing fiber are provided with 1 / 4 lambda waveplates respectively, and the 1 / 2 and 1 / 4 lambda waveplates are aligned and fixedly mounted via a fixing device; and a main controller, a master time controller, a comparison circuit and an A / D conversion module are arranged in the cabinet, and a control display panel is arranged on the cabinet. The measuring cabinet mainly use a Faraday magneto-optic effect, deflection caused by influence of the magnetic field during transmission of light in the fibers is converted into the magnitude of the current, and measurement and analysis are realized.

Description

technical field [0001] The invention relates to the field of devices for measuring current or voltage, and in particular to a portable flexible optical fiber current measuring box applied to power grid substations, thermal power plants, hydropower stations, nuclear power plants, solar photovoltaic power stations and large-scale non-ferrous metal smelting and electrolysis plants. Background technique [0002] The main principle of the fiber optic current sensor is to use Faraday's magneto-optical effect. When the conductor flows through the current, a certain size of magnetic field will be generated around the conductor, and the light wave will undergo a phase change in the propagation of light under the action of the magnetic field of the current-carrying conductor, and the light intensity will be detected. The degree of phase change can measure the magnitude of the corresponding magnetic field, and the magnitude of the current can be obtained through conversion. The fiber o...

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Problems solved by technology

[0005] 1. The 1 / 4λ wave plate and the 1 / 2λ wave plate cannot be aligned accurately every time, and the alignment process takes a lot of time;

[0006] 2. The Sagnac phase error caused by vibration or rotation, the phase error caused by the residual linear birefringence in the optical fiber when the temperature changes, etc., in order to eliminate or reduce the phase error of the existing optical fiber current sensor, it can also meet the needs of users in the equipment. The bus is installed without power off, its structure is very complicated, the structure is not standardized, it cannot be used universally, and it is inconvenient for industrial production

[0007] 3. The test method based on the existing optical fiber current sensor is not simple enough and the degree of automation is low

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