Measurement method and device for optical voltage transformer dynamic property research

Abstract

The invention discloses a test method and a device for optical voltage transformer dynamic property research. A board NI7813R which contains field programmable gate array (FPGA) is utilized to substitute the FPGA in the closed-loop detection circuit of the original optical voltage transformer, an isolation device is arranged between an analog-digital / digital-analog converter of the closed-loop detection circuit and the FPGA of the board NI7813R for connection and communication, and the FPGA of the board NI7813R is connected with a computer through a peripheral component interconnect (PCI) bus; the test device has the capabilities of high speed data acquiring, storing and processing, closed-loop state variables can be displayed and stored by the computer, so the working condition of a system closed loop is monitored in real time; no other external equipment is needed, sine excitation signals and step-input singles with tunable frequency are provided by a hardware of the measurement device, so the frequency characteristic and the closed-loop step response performance of an optical voltage mutual inductance system are tested; and the frequency characteristic of an internal function module in an optical voltage transformer can be tested, a high frequency dynamic model of the module is built, and a foundation is laid for the optical voltage transformer dynamic property research.

Description

technical field [0001] The invention relates to an optical voltage transformer, in particular to a testing method and device for researching the dynamic performance of an optical voltage transformer based on the Pockels effect. Background technique [0002] Dynamic performance research is an important part of optical voltage transformer research. The national standard IEC 60044-8 has made clear requirements for the dynamic performance of optical voltage transformers: in high voltage measurement, voltage transformers should have at least a frequency response of several KHz characteristics and a response time of a few milliseconds, for some applications such as traveling wave protection relays, measurement frequencies up to hundreds of kHz are required. According to the existing literature, the existing domestic and foreign optical voltage transformers based on the Pockels effect have a maximum bandwidth of 40kHz, and the existing domestic and foreign optical voltage transform...

AI Technical Summary

Problems solved by technology

In the prior art, the closed-loop control process of the optical voltage transformer system is carried out in the FPGA, and the closed-loop state variables change rapidly at the microsecond level, so it is difficult to monitor the closed-loop state of the system in real time

In the prior art, the model of the internal module of the optical voltage transformer system is often established through theoretical derivation, which is difficult to approach the dynamic model of the real signal detection unit, which is not conducive to the development of the research work on the dynamic performance of the optical voltage transformer

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