Acquiring and amplifying device of passive AC micro-current

Abstract

An acquiring and amplifying device of a passive AC micro-current comprises a multi-winding insulating coil, coil taps of N times of number of turns are extracted from the coil to be connected with device leading-out terminals respectively, and the device leading-out terminals comprise a common terminal 0, 1N-6N times of terminals. A discharge display lamp and a discharge tube are connected parallelly between every two of the common terminal 0 and the 1N-6N leading-out terminals, a wiring plug is connected with the device leading-out terminals via an experimental line, and the whole amplifying device is placed in an insulating plastic device shell with a box cover. The acquiring and amplifying device of the passive AC micro-current of the present invention enables the work efficiency to be improved substantially, is low in device manufacture cost, and possesses certain application and popularization values.

Description

technical field [0001] The invention relates to the field of an electrical parameter tester for electrical equipment, in particular to a passive AC micro-current acquisition and amplification device. Background technique [0002] With the continuous increase of social electricity consumption, large, medium and small substations have been built and put into power transmission. According to the electric power regulations, the electrical parameters of the equipment after power transmission should be tested with load, commonly known as "phasor analysis". Through phasor analysis, it can be judged whether the wiring polarity, group, transformation ratio, and direction of the electrical equipment are correct, so as to ensure the safe and reliable operation of the electrical equipment after power transmission. [0003] At present, the phasor analysis products of various manufacturers are only suitable for secondary currents above 0.15-0.2A. For currents below 0.15A, the measurement...

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Problems solved by technology

[0003] At present, the phasor analysis products of various manufacturers are only suitable for secondary currents above 0.15-0.2A. For currents below 0.15A, the measurement results are unstable, there is a large digital drift phenomenon, and the transformation ratio and direction cannot be accurately judged. For the correctness of the parameters, it is necessary to wait for the line to carry a certain load before performing phasor analysis, and sometimes it takes a long time to wait for the user to carry the load

In order to ensure the safe operation of the equipment after power transmission, some useless loads are even adopted to obtain the load current, which will lead to the risk of load reverse operation, long waiting time, and waste of electric energy

Furthermore, as the loop current increases, the open circuit voltage rises accordingly, once the work is wrong, it will easily endanger the safety of people and equipment.

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