JPH0584870U - Telescopic clamp type ammeter - Google Patents

Abstract

(57) [Summary] [Purpose] When measuring current in high places and out of reach, it is dangerous to use a clamp-type ammeter with a stepladder or ladder. C
The extended clamp type ammeter with the cord for connecting the CT core and the main circuit connected to the string for moving the lever to open and close the T is exposed and attached to the operating rod is inconvenient to carry and the operation is troublesome. , These improvements had been a challenge. [Structure] When the guide plate is attached to the opening / closing part of the CT core storage case and the guide plate is pressed against the electric current measurement target wire,
The CT core storage case opens to guide the electric wire into the clamp CT, and the expansion pipes with successively smaller diameters are accommodated in the grasping pipes so that they can be drawn out. The telescopic clamp type ammeter is characterized in that it is connected to the main circuit and stretches when the telescopic pipe is stretched, and is retracted without being entangled when the telescopic pipe is stored in the grasping pipe.

Description

[Detailed description of the device]

[0001]

[Industrial field]

 The present invention relates to a telescopic clamp type ammeter for the purpose of measuring current in high places and out of reach.

[0002]

[Prior Art]

 Conventionally, when measuring current in high places, a normal clamp type ammeter is used by using a stepladder, ladder, or a cord for moving the clamp CT opening / closing lever is connected to the clamp CT and the main circuit. An extended clamp type ammeter was used, which was exposed to the transmission cord and attached to the operating rod. When measuring currents that are out of reach, a normal clamp-type ammeter is forcibly clamped to the target wire, or the extension clamp-type ammeter described above is used.

[0003]

[Problems to be solved by the device]

 When measuring current in high places and out of reach at electric power companies, electric safety associations, factories, construction sites, etc., a normal clamp-type ammeter must use a stepladder or ladder. It is dangerous, and the cord for moving the lever to open and close the clamp CT and the cord for connecting the CT core and the main circuit are exposed and the extended type clamp ammeter attached to the operating rod makes it easy to carry. Because of the inconvenience and troublesome operation, these improvements have been a problem.

In order to solve the above problems, according to the present invention, a guide plate is attached to a CT core storage case, and when the CT core storage case is pressed against an electric wire for current measurement, the CT core storage case opens to clamp the electric wire CT. When guided inward and pulling the CT core storage case, the CT core storage case opens and the electric wire is discharged to the outside, eliminating the need for a stepladder or ladder. In addition, the expansion pipes that are successively formed with smaller diameters are housed in the grasping pipes so that they can be drawn out, and the curl-shaped cords inserted through these pipes connect the CT core and the main circuit to extend the expansion pipes when they are extended. When the retractable pipe is stored in the gripping pipe, it is retracted and stored without being entangled so that the transmission cord is not exposed to the outside. Furthermore, the phenomenon of the entanglement of the electric cord was solved by adjusting the inner diameter of the pipe and the outer diameter of the curled cord.

[0005]

【Example】

 Examples will be described with reference to the drawings. Reference numeral 1 is a guide plate made of synthetic resin or the like in the shape of a butterfly wing, and 2 is a split CT core storage case made of synthetic resin. The guide plate 1 is for opening and closing the CT core storage case 2. It is attached to the part. Then, when the guide plate 1 is pressed against the electric current measurement target wire, the CT core storage case 2 is opened by the guide plate 1, the electric wire is guided into the clamp CT and closed, and the CT core storage case 2 is pulled. The CT core storage case 2 is opened by the guide plate 1, and the electric wire is discharged from the clamp CT to the outside and closed. The CT core 12 is stored in the CT core storage case 2. The CT core 12 performs current conversion. Reference numeral 3 is an insulating grasping pipe molded of glass fiber or the like. Inside, there are several expandable pipes 8 and 9 which are formed in the order of smaller diameters. The CT core storage case 2 is attached to a telescoping pipe with the smallest diameter. Reference numeral 4 denotes a main body case fixed to the grasping pipe 3, and an accommodating portion 11 is provided inside the main body case 4 for accommodating a main body circuit and a battery, and a data hold switch 5 and an ON / OF switch 6 are provided outside. The current display unit 7 is provided, the measured value is displayed on the current display unit 7, and the measured value can be held.

The CT core 12 and the main body circuit are connected by a curled cord 10 inserted through each pipe. The curled cord 10 transfers the electric current converted by the CT core 12 to the main body circuit and at the same time expands and contracts the pipe. It is configured such that when 8 and 9 and the like are extended to several sections as needed, they are extended, and when the telescopic pipes 8 and 9 and the like are stored in the grasping pipe 3, they are retracted and stored. Furthermore, the phenomenon of the entangled cord was solved by adjusting the inner diameter of the pipe and the outer diameter of the curled cord.

[0007]

[Effect of the device]

 According to the present invention, when the guide plate 1 is attached to the opening / closing part of the CT core storage case 2 as described above and the guide plate 1 is pressed against the electric current measurement target wire, the CT core storage case 2 opens and the electric wire is set in the clamp CT. In addition, when the CT core storage case 2 is pulled, the CT core storage case 2 opens and the electric wire is discharged to the outside. The expansion pipes 8 and 9 that are successively formed with smaller diameters can be drawn out to the grasping pipe 3. The CT core 12 is connected to the main body circuit with the curl-shaped cord 10 inserted in these pipes, and when the telescopic pipes 8 and 9 are stretched, they stretch and grasp the telescopic pipes 8 and 9 etc. Since it is configured to be contracted and stored without being entangled when it is stored in the pipe 3, it is possible to freely transfer the current conversion value by the clamp CT to the main circuit, and in the past, it was possible to use it in high places and hands. When measuring the current in the place where it does not work, the usual clamp type ammeter must use a stepladder and a ladder, which may cause a fall accident or electric shock. Also, move the lever to open / close the clamp CT. The extended clamp-type ammeter, which exposes the cord to connect the cord, the CT core and the main circuit, and attaches it to the operating rod, was inconvenient to carry and troublesome to operate, but this problem was solved by the present invention. We were able to.

[Brief description of drawings]

FIG. 1 is a front view of the present invention in a contracted state.

FIG. 2 is a front view of the present invention in an extended state.

[Explanation of symbols]

1 Guide plate 2 CT core storage case 3 Grasping pipe 4 Body case 5 Data hold switch 6 ON / OF
Switch 7 Current value display 8, 9 Telescopic pipe 10 Curled cord 11 Main circuit / battery compartment 12 CT core

Claims (2)

[Scope of utility model registration request] 1. When the guide plate 1 is attached to the opening / closing part of the CT core storage case 2 and the guide plate 1 is pressed against the electric wire of the current measurement target, the CT core storage case 2 is opened to guide the electric wire into the clamp CT, Further, when the CT core storage case 2 is pulled, the CT core storage case 2 is opened and the electric wire is discharged to the outside. 2. The grasping pipe 3 accommodates telescopic pipes 8 and 9 each having a smaller diameter one by one so as to be drawn out, and the curl cord 10 inserted through these pipes connects the CT core 12 and the main circuit. When the telescopic pipes 8 and 9 are stretched, the telescopic pipes 8 and 9 are stretched, and when the telescopic pipes 8 and 9 are stored in the grasping pipe 3, the telescopic pipes 8 and 9 are contracted and stored without being entangled, and the electric power is transmitted and received. Clamp type ammeter.