JPS647334Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a current detector that detects the line current flowing in a high-voltage distribution line without cutting the wire, and its object is to provide a magnetic core mounting structure that is simple in structure, inexpensive, detachable, easy to work with, and highly reliable in installation.

Normally, when measuring the current flowing through a wire, a part of the wire is cut, an ammeter is connected, and the current is read. It is common to use current transformers to measure current, especially in the case of high voltages. However, cutting a portion of the wire requires a power outage, and the work is inefficient and dangerous, especially at high voltages.

Therefore, various current detectors have been proposed that measure current without cutting the electric wire. One example is shown in Fig. 1. As shown in Fig. 1, a porcelain bushing 1 is made of an insulating material such as porcelain, with one end closed and the other end open, and has a cylindrical space inside. A horseshoe-shaped magnetic core 2 is attached to the outer surface of the head of the porcelain bushing 1.
The device is made up of a printed circuit board 4 incorporating a Hall element 3 mounted inside the porcelain tube 1 and a circuit for amplifying the output of the Hall element 3, a bottom cover 5 for maintaining airtightness, and terminals 6 for connecting a power source and an output signal to the circuit including the Hall element 3 inside. The magnetic field generated by the current flowing through the electric wire 7 is detected by the magnetic core 2 and guided to the Hall element 3 on the printed circuit board 4, where it is converted and amplified into a voltage signal and taken out as an output.

When such a current detector is mounted on a pole, for example, on a distribution line, as shown in FIG. The gap between the electric wires 7 is adjusted and fixed, and then the magnetic core 2 is inserted from above so as to hold the electric wires 7. However, in this case, there is a risk that the magnetic core 2 may fall off due to shaking of the power distribution line or vibration or impact during work, and the magnetic core 2 may be installed separately from the current detector 8 on a high pole.
There were problems such as poor workability, such as having to carry around the machine.

The present invention has been devised in view of the above-mentioned drawbacks of the conventional art, and one embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Note that components that are the same as those in the conventional configuration described above are designated by the same numbers, and their explanations will be omitted.
As shown in FIG. 3, a U-shaped arm fitting 11 is attached to one side of the magnetic core 2, and a core retaining groove 12 is attached to the other side corresponding to this. A core fixing elastic body 13 made of a wound non-magnetic extensible ring-shaped stainless steel coil spring passes through the arm fitting 11 and fits into the groove 12. In such a configuration, when a pole is installed on a power distribution line, the magnetic core 2 is first attached to the core fixing elastic body 13 wrapped around the neck of the insulator tube 1.
is held at the neck of the head of the insulator tube 1 in a state as shown in FIG. 2 is inserted from above so as to hold the electric wire 7, and further inserted and fixed until the core fixing elastic body 13 fits into the core fixing groove 12 of the magnetic core 2.

As is clear from the above configuration, according to the present invention, the magnetic core is always attached to the head of the current detector, there is no need to carry it separately, and after the electric wire is attached,
Just by stretching the elastic body for core fixing, inserting the magnetic core, and then inserting it again, it will fit and be fixed in the magnetic core fixing groove, making it easy to work, and also prevents the magnetic core from being damaged by vibrations or shocks caused by shaking of the wire or during work. There is no need to worry about it falling off, and installation reliability is improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional current detector, Fig. 2 is an explanatory diagram when the same current detector is installed on a distribution line, and Fig. 3 is a sectional view of a current detector according to an embodiment of the present invention. , FIG. 4 is an explanatory diagram when installing the same current detector on a power distribution line. DESCRIPTION OF SYMBOLS 1... Insulator tube, 2... Magnetic core, 3... Hall element, 7... Electric wire, 11... Arm fitting, 12... Core fixing groove, 13... Elastic body for core fixing.

Claims (1)

[Scope of utility model registration request] A hall element is provided near the inner ceiling of the head of the insulating tube, and the electric wire is wrapped around the outer surface of the head of the insulator, and the resulting horse-shoe-shaped magnetic field is guided to the hall element inside the insulator tube. In a current detector comprising a magnetic core, a part of one side of the magnetic core is attached to a non-magnetic core-fixing elastic body wrapped around the neck of the insulator tube head, and a part of the other side is attached to the elastic body. A current detector characterized by having a groove portion into which the body fits.