A detection method for preventing misoperation of transmission lines

Abstract

The invention discloses a detection method for misoperation prevention of a power transmission line. The method comprises the steps of sleeving an induction coil in equipment on an earthing knife-switch, sleeving two coils containing iron cores on the knife-switch, one coil as a source coil and with alternating current and the other coil as a measuring coil for measuring the magnitude of induced current in a down conductor loop, analyzing and calculating source coil voltage and current measured by the measuring coil, obtaining loop impedance of the whole line, informing a transformer substation at the opposite end of turning on an earthing knife-switch at the opposite end, allowing the equipment to detect the earthing condition and the interphase short circuit condition of the line phase by phase, informing a dispatching department of powering on if a detection result shows no interphase short circuit or earthing other than the earthing of the local earthing knife-switch, and informing the earthing knife-switch at the opposite end to switch on and debug if the line status is abnormal. The method has the advantages that the earthing condition of the line after overhaul and before switching-on can be detected, and the line can be directly judged whether an earthing point exists according to the detection result.

Description

technical field [0001] The invention belongs to a method for preventing misoperation of power transmission and distribution lines, and is applicable to the technical field of methods for preventing misoperation of switching on under short-circuit conditions after maintenance of power transmission and distribution lines. Background technique [0002] When the power transmission and distribution lines are powered off for maintenance, in order to ensure the safety of people and equipment, the lines will be grounded. After the maintenance is completed, the grounding needs to be released before closing. However, due to various reasons, it may happen that the switch is closed without releasing the grounding, which will inevitably fail to close the switch, and at the slightest, it will cause a longer power failure time, and at the worst, it will threaten the safety of equipment and even personal safety. Some places now use certain communication methods, such as power carrier commun...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of time-consuming, labor-intensive and poor operability of the above-mentioned existing methods, the present invention provides a new method for detecting whether the grounding wire is disconnected after the circuit maintenance. This method can effectively and conveniently judge whether the grounding wire of the line is Disconnect, save a lot of manpower and material resources, improve the safe operation level of the power system

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