All-optical overvoltage monitoring device for electric power system
A technology for power systems and monitoring devices, applied in the field of all-optical overvoltage monitoring devices for power systems, can solve problems such as insufficient measurement accuracy and difficulty in accurately measuring overvoltage signals, and achieve high measurement reliability, convenient installation and maintenance, and insulation problems small effect
Inactive Publication Date: 2015-07-22
TSINGHUA UNIV +1
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However, this scheme is affected by factors such as stray capacitance and inductance, resulting in insufficient measurement accuracy
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[0025] A power system all-optical overvoltage monitoring device proposed by the present invention has a structure such as figure 1 As shown, the overvoltage monitoring device includes:
[0026] The laser source 1 is used to send out laser signals. In one embodiment of the present invention, the model of the laser source used is the C-band gain-flattened ASE light source of Junfeng Company.
[0027] The polarizer 2 is used to receive the laser signal output by the light source through the optical fiber 3, and convert the laser signal into linearly polarized light;
[0028] The optical electric field sensor 4 is used to receive linearly polarized light through the optical fiber 3, decompose the linearly polarized light into two polarized light signals propagating on the fast axis and slow axis of the sensor crystal, and is used to sense the electric field generated by the voltage in the power system , based on the Pockels effect, the electric field induced by the sensor changes...
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The invention relates to an all-optical overvoltage monitoring device for an electric power system and belongs to the technical field of voltage measuring. The all-optical overvoltage monitoring device comprises a laser source for transmitting laser signals, a polarizer, an optical electric field sensor, a polarization beam splitter, an optical receiver, an analog-to-digital converter, a cache, a processor and industrial personal computer. The all-optical overvoltage monitoring device has the advantages that the integrated optical electric field sensor is used, influence of the optical electric field sensor on an original electric field is small due to the fact that the optical electric field sensor contains no metal, and high measuring reliability is achieved; the device is large in frequency range and consistent in frequency response under power frequency and overvoltage frequency, so that the device can measure power frequency voltage, inner overvoltage and outer overvoltage; the device is applicable overvoltage online monitoring in the electric power system and voltage measuring during tests and debugging, and analytical data is provided to possible equipment faults.
Description
technical field [0001] The invention relates to an all-optical overvoltage monitoring device for a power system, which belongs to the technical field of voltage measurement. Background technique [0002] Overvoltage is one of the main causes of power grid accidents, and it is also a decisive factor in selecting the insulation strength of electrical equipment. Although the duration of overvoltage is short, it will pose a serious threat to electrical insulation due to its high peak value, steep waveform, and large energy. In power system, the measurement and analysis of overvoltage is of great significance. By analyzing the occurrence and development process of overvoltage, reliable data can be provided for dealing with accidents, and important references can be provided for proposing improvement measures. At the same time, it can also provide practical and effective information for electrical manufacturing. [0003] For example, for substations, for systems of 220kV and be...
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Inventor 曾嵘庄池杰谢施君汪海李建明张榆陈少卿余占清
Owner TSINGHUA UNIV