High and low voltage integrated phase-sequence phase meter and detection method thereof

Abstract

The invention relates to a high and low voltage integrated phase-sequence phase meter which comprises two emitters and a receiver wirelessly connected with the emitters, wherein each emitter comprises an A / D (analog / digital) sampling circuit, a coding circuit and a wireless emitting module; and the receiver comprises two wireless receiving modules, decoding circuits, a signal processing module electrically connected with output ends of the two decoding circuits, and a display circuit connected with the output end of the signal processing module. A resistance direct voltage dividing principle is adopted for measuring a nuclear phase under low voltage, and a sampling inducing principle is adopted for measuring the nuclear phase under high voltage. By converting the measurement according to high and low voltage conditions, the invention enables one device not only can realize phase sequence judgment of a single-supply circuit and phase judgment of a double-supply circuit in a low-voltage active circuit , but also can achieve the phase sequence judgment of the single-supply circuit and the phase judgment of the double-supply circuit in a high-voltage active circuit, and avoids the defects brought by the measurement by using more devices at a complex construction site, thereby having larger market application value.

Description

technical field [0001] The invention relates to a high-voltage and low-voltage comprehensive phase-sequence instrument for checking the phase sequence of a three-phase power supply 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 phase ...

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

Images