Telescopic type clamp-on ammeter for overhead line measurement

Abstract

The invention provides a telescopic type clamp-on ammeter for overhead line measurement. A plurality of image pick-up pinholes are formed at an iron core clamp head; collected optical signals are guided to an image pick-up component through an optical fiber so as to form a positioning screen; the positioning screen can be adopted as references for the operation of engineering staff; a three-dimensional guide map indicating the space position relationship of the clamp head and a conductor can be simulated in real time according to the positioning screen; and the relative position change of the clamp head and the conductor can be reflected in the three-dimensional guide map, so as to serve as an indication for the engineering staff. According to the telescopic type clamp-on ammeter for the overhead line measurement of the invention, the iron core clamp head and the facing direction of the jaw of the clamp head can be adjusted sufficiently and freely, so that clamping operation in all directions can be facilitated; and the clamp head can be easily locked after the direction of the clamp head is adjusted, so that a single conductor can be separated from a plurality of bunched conductors so as to be clamped.

Description

technical field [0001] The invention relates to the technical field of power measurement, in particular to a telescopic clamp ammeter used for overhead line measurement. Background technique [0002] The clamp ammeter is a tool that uses mutual inductance to detect live current on the line. A clamp ammeter consists of two parts, a current transformer and an ammeter. Among them, the current transformer has a clamp-shaped iron core, which can be opened and closed. When the iron core is opened, the measured wire can enter the iron core through the opened opening. When the iron core is closed, the wire is captured by the iron core nested within. At this time, if figure 1 As shown, the wire 1001 is used as the primary coil of the current transformer, and the current passing through the wire will generate an induced current in the secondary coil 1003 partially wound on the iron core 1002 . The ammeter 1004 connected to the secondary coil 1003 actually measures the induced curr...

AI Technical Summary

Problems solved by technology

[0006] However, practice has shown that the whole process of moving and adjusting the position of the telescopic rod to make the measured wire enter the opened clamp head is still very inconvenient, time-consuming and labor-intensive.

The reasons are as follows: First, in order to ensure the effect of mutual inductance, the volume of the pliers head-shaped iron core itself should not be too large, so the opening of the pliers head is naturally smaller, and the engineering personnel operate indirectly through the telescopic rod at a farther position Clamp head, making it difficult for overhead conductors to enter this smaller opening

Second, due to the influence of the long distance, small opening and other parts at the end of the telescopic rod that block the pliers, engineers cannot accurately visually observe the relative position between the pliers opening and the wire during operation, and often rely on experience to feel. Blind operation, the success rate has a great relationship with the proficiency of engineers

The third is that the flexibility of the clamp head itself is not high. Most of the existing structures set the opening on the top of the clamp head. Enter the opening of the pliers head, but if the wire extends in other directions or is bent and coiled, the pliers head needs to clamp the wire in other directions, which will bring a lot of inconvenience to the operation, so it is hoped that the orientation of the pliers head and its opening can be adjusted

Fourth, it is impossible to deal with the situation where the measured wires are gathered into clusters. In order to measure the current value, the clamp head can only clamp a single wire. If more than two wires are clamped, the measurement will fail; and in practical applications, overhead lines often In the case where multiple wires are gathered in clusters and the distance between them is very small, it is difficult for the existing pliers to separate a single wire from it for clamping

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