Measuring method, measuring device and measuring system for potential of long straight wire

Abstract

The invention discloses a measuring method for potential of a long straight wire. Only three one-dimensional electric field sensors need to be arranged along a straight line, so that sensitive directions of various electric fields are ensured to be collinear with the straight line, and the straight line is not parallel to a long straight wire to be tested; the electric field intensity generated bythe long straight wire to be tested in the electric field sensitive directions of the three one-dimensional electric field sensors and the relative distance between the three one-dimensional electricfield sensors are obtained respectively, then a potential value of the long straight wire to be tested can be calculated; compared with the prior art, the one-dimensional electric field sensors do not need a heavy iron core or a magnetic core, do not need to be connected to the long straight wire to be tested, and a plurality of one-dimensional electric field sensors are adopted; and the positionbetween the one-dimensional electric field sensors and the long straight wire to be tested is not needed to be fixed, so that the requirement for the testing position is greatly reduced, the measuring difficulty is not only reduced, but also the measuring accuracy is improved. The invention further provides a measuring device and a measuring system for the potential of the long straight wire, which also have the above beneficial effect.

Description

technical field [0001] The invention relates to the technical field of electric power detection, in particular to a measurement method, a measurement device and a measurement system for the potential of a long straight wire. Background technique [0002] Potential, also known as electric potential. As an essential input variable for the power system to achieve optimal operation, control, protection and other functions, the line potential is one of the common items that require large-scale testing. Much research has been done on the problem of measuring line potentials. [0003] The traditional line potential measurement method is to use a voltage transformer to connect to the line for measurement. The primary winding of the voltage transformer is connected in parallel with the line under test, and the secondary winding is connected to the voltage coil of the voltmeter or wattmeter. The voltage transformer used in this measurement method not only has the disadvantages of la...

AI Technical Summary

Problems solved by technology

The voltage transformer used in this measurement method not only has the disadvantages of large size, heavy weight, and inconvenient testing, but also the voltage transformer based on the principle of mutual inductance cannot accurately measure the DC voltage component, and it needs to be connected to the line under test, which requires high installation requirements. High insulation requirements lead to inaccurate measurement of line potential

Similarly, a voltage sensor using the Hall effect principle or an optical fiber voltage sensor can measure DC voltage, but it is also necessary to connect the voltage sensor to the line under test, and the insulation problem still needs to be considered

[0004] With the development of Micro-Electro-Mechanical System (MEMS, Micro-Electro-Mechanical System) technology, the electric field sensor based on MEMS technology can be used to measure the electric field generated by the power line in space, and the voltage sensor based on a single MEMS electric field sensing chip is not It needs to be in direct contact with the tested line, and does not need the iron core or magnetic core carried by the voltage sensor. However, the relative position of the electric field sensor and the tested wire must be fixed during measurement, which requires extremely high installation requirements and is not practical.

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