High-pressure phase sequence phasemeter and detection method thereof

Abstract

The invention relates to a high-pressure phase sequence phasemeter comprising two transmitters and a receiver which is wirelessly connected with the transmitters. Each transmitter comprises an A/D sampling circuit, a coding circuit and a wireless transmitting module; the receiver comprises two wireless receiving modules, decoding circuits, a signal processing module and a display circuit, wherein the signal processing module is electrically connected with the input ends of two decoding circuits; the display circuit is connected with the output end of the signal processing module; in a state that a power system normally runs, the transmitters are connected with any one phase cable of a single power line, thereby coupling capacitors are generated between each of the transmitters and the cable; by acquiring the voltage of the coupling capacitors and processing voltage signals, the phase sequence judgment on the single power line can be carried out; the two transmitters are the same phase cable of single power lines at two sides are connected, thereby the phase sequence judgment on dual power lines can be realized to determine whether power supplies at two sides share the same phase or not; and the invention is suitable for being used at the 10-110kV high-voltage grade.

Description

technical field [0001] The invention relates to a high-voltage phase sequence meter for checking the phase sequence of three-phase power supply under the high voltage level of 10-110kV in a power system and a detection method thereof. Background technique [0002] With the improvement of industrial and living standards, the load of electricity is increasing day by day. In order to ensure the reliable supply of daily electricity, many adjacent power supply systems are now combined to ensure that one of the power supply systems (such as substations) appears In the event of a failure, another power supply system can continue to supply voltage to it. Specifically, the three-phase power line of one substation is connected with the three-phase power line of the corresponding phase of another substation. However, before the connection, it is necessary to check the phases of the corresponding phases of the three-phase power lines on both sides, that is, one Side A corresponds to ph...

AI Technical Summary

Problems solved by technology

Due to the difference comparison, the phase difference angle cannot be determined for the phases of the corresponding phases of the two lines, so the measurement results cannot be completely guaranteed to be in the same phase

Moreover, in the early stage of the above-mentioned measurement, it is necessary to judge the phase sequence of the single-side power supply circuit first, which in turn requires the use of another set of independent functional instruments.

Therefore, it is extremely inconvenient to operate in a complex on-site environment

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