Three-phase phase sequence indicator and system

Abstract

The invention discloses a three-phase phase sequence indicator and system; the indicator comprises a controller, a GPS module, a phase sequence indication lamp, a current sampling circuit, a wirelesscommunication module, and a current sensor which is connected with the current sampling circuit, wherein the GPS module, the phase sequence indication lamp, the current sampling circuit and the wireless communication module are connected with the controller. The GPS module acquires satellite time and synchronizes the satellite time to the controller clock; the current sampling circuit collects current through the current sensor and uploads the current to the server through the wireless communication module regularly. The controller records a current zero-crossing moment when external interruption is caused by current zero-crossing, and obtains a clock reference source current zero-crossing moment and a power grid period from the server through the wireless communication module; the controller calculates the phase angle difference of the current according to the current zero-crossing moment, the clock reference source current zero-crossing moment and the power grid period, and identifies the phase sequence of the current at the moment according to the relation among the phase angle difference, the current direction and the phase sequence; and the phase sequence indicating lamp identifies the phase sequence of the current through different colors.

Description

technical field [0001] The invention relates to the field of electric power system auxiliary equipment, in particular to a three-phase phase sequence indicator and a system. Background technique [0002] With the development of cities, urban facilities are becoming more and more perfect, and the power cable power supply network is increasing day by day. The phase sequence identification of urban distribution network cables and the measurement of electrical quantities during operation are very important links in daily operation and maintenance. During cable installation or equipment acceptance, due to the complex power supply network and many line branches of the power distribution system, if the phase sequence before and after construction or emergency repair is inconsistent, it will cause phase-to-phase short circuit during ring closure, and direct power supply to users may cause reverse damage to three-phase equipment. Cause damage to electrical equipment, and in severe c...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a three-phase phase sequence that automatically detects the phase sequence of a three-phase transmission line and effectively displays it in view of the defects in the prior art that the phase sequence identification of the power grid is not uniform, incorrect, or the identification is faded and cannot be identified Indicators and Systems

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