High pressure series connection valve typed multiple physical quantity measuring system for experiment

Abstract

The invention provides a high pressure series connection valve typed multiple physical quantity measuring system for an experiment. The measuring system comprises a measuring unit, a data collection front end, a photoelectric measuring device, an oscilloscope and a computer, wherein the measuring unit, the data collection front end and a photoelectric measuring system are connected in sequence; the photoelectric measuring system are in communication with the oscilloscope and the computer. The high pressure series connection valve typed multiple physical quantity measuring system for the experiment has the advantages of achieving real time monitoring of the high pressure multiple physical quantity measuring system, being high in precision, being high in reliability, being stable in performance and being good in anti-interference capability.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a multi-physical quantity measuring system for type testing of high-voltage series valves. Background technique [0002] With the gradual promotion of the application of power electronics technology in power systems, high-pressure valves based on power electronics series voltage equalization technology have become the core components of various high-power power electronics devices. Such as SVC, TCSC, HVDC, etc. The type test is an important test method related to improving the design and manufacturing level of various high-pressure series valves and improving their reliability. [0003] The multi-physical quantity measurement system is an important means for measuring and monitoring multi-physical quantities such as voltage, current and temperature at different measuring points of the test valve in the high-pressure series valve test device. At present, the mul...

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Problems solved by technology

However, the test valve works under the joint full working condition of alternately generating high voltage and high current, which is at high potential and the electromagnetic environment is harsh. Therefore, it is difficult to meet the requirements by using traditional measurement methods.

Compared with the traditional measurement method, the main technical difficulties are as follows: 1) The electromagnetic environment of the valve body is relatively harsh. On the one hand, the large current and high field strength in the test will cause greater electromagnetic interference to the measurement system. On the other hand, The fast switching process of power electronic devices will also generate a large amount of strong electromagnetic interference, so the anti-interference design problem and measurement accuracy problem of the measurement system must be solved; The problem of independent power supply of the measurement point; 3) The problem of communication isolation between the measurement system and the ground potential equipment must be solved

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