Alignment detection method and alignment instrument

Abstract

The invention aims to provide an alignment detection method and an alignment instrument. The alignment detection method comprises the following steps: S1, taking phase voltages of an A phase, a B phase and a C phase at two ends of a to-be-detected cable; S2, providing a time reference t by using a time pulse, and recording the moment when the voltage of each phase passes through two adjacent zeropoints under the same time reference t; S3, calculating the number of pulses generated by time-base pulses when the voltage of each phase is between two adjacent zero points; S4, calculating a difference value, wherein the obtained minimum difference value is a threshold value; and S5, if the difference value is smaller than the threshold value, determining that the phases are the same, otherwise,allowing the measuring line of the receiving end to be measured to need to be reversed until the difference value is measured to be smaller than the threshold value. According to the invention, eachphase is distinguished based on different potentials and different voltage zero-crossing point time positions, and whether the voltage is the same line is judged by measuring the number of time-base pulses of the voltage between adjacent zero points under the same time reference. The alignment method is accurate in measurement and high in alignment efficiency.

Description

technical field [0001] The invention belongs to the technical field of electric power detection and equipment, and in particular relates to a line alignment detection method and a line alignment instrument for identifying the three-phase electric phase sequence of a low-voltage power grid user side and a transformer side. Background technique [0002] Due to the chaotic and complicated wiring of the low-voltage power grid, it is difficult to correspond one-to-one with the three-phase power at the user end and the three-phase power at the transformer end. The three-phase unbalance causes energy waste, which will seriously affect the service life of the load, and there is also a hidden danger of endangering the power grid, which affects safe production. If the phase sequence of the electrical equipment is wrong, the three-phase motor that originally needs to rotate in the forward direction will work in the reverse direction. Therefore, for safe production, it is necessary to ...

AI Technical Summary

Problems solved by technology

[0002] Due to the chaotic and complicated wiring of the low-voltage power grid, it is difficult to correspond one-to-one between the three-phase power at the user end and the three-phase power at the transformer end. Three-phase imbalance causes energy waste, which will seriously affect the service life of the load, and there are hidden dangers of endangering the power grid, affecting safe production

If the phase sequence of the electrical equipment is wrong, the three-phase motor that originally needs to rotate in the forward direction will work in the reverse direction.

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