Multiband measurement digital linear alternating current transformer and measuring method thereof

Abstract

The invention relates to a multiband measurement digital linear alternating current transformer and a measuring method thereof. On the basis of an active digital current transformer, the high-frequency measurement function is enhanced by using the advanced controllable high speed signal acquisition processing and optical fiber conduction technology under the premise of ensuring power frequency current measurement, so that the alternating current transformer capable of multiband control measurement is realized. The alternating current transformer structurally comprises a digital linear alternating current sensor, wherein an output end of the digital linear alternating current sensor is connected with an input end of a high-pressure side high speed data acquisition module, and an output endof the high-pressure side high speed data acquisition module is connected with an input end of a high speed optical fiber insulated transmission module; and an output end of the high speed optical fiber insulated transmission module is connected with an input end of a power frequency output interface and an input end of a signal frequency dividing module respectively, and an output end of the signal frequency dividing module is connected with an input end of a harmonic output interface and an input end of a high frequency output interface respectively to output measurement values respectively.

Description

technical field [0001] The invention relates to a multi-band measuring digital linear AC current transformer with high-speed acquisition performance and its measurement method. Based on the active digital current transformer, it uses advanced controllable high-speed signal acquisition and processing and optical fiber transmission technology to achieve multi-band measurement. Background technique [0002] For decades, current transformers have mostly adopted electromagnetic structures. The purpose of system measurement is mainly for power metering and relay protection. Due to the characteristics of electromagnetic structures, it is impossible to measure high-frequency signals. With the development of the power grid, the measurement of current high-frequency signals is becoming increasingly important to grasp the operating status of the system and equipment, and to predict and analyze the abnormal occurrence and development trend in time. There is an urgent need for digital li...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the current problem of inconvenient measurement of multi-frequency band current in power grid operation, and to provide a high-speed acquisition performance suitable for various high-voltage levels, with high-frequency signal acquisition, high linearity, digital, and high precision. Multi-band measurement digital linear AC current transformer and its measurement method

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