JPH0921831A - Hot line voltage measuring bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make measurement on the ground by using a long measuring bar possible since operation of measuring an electric wire voltage of an electric can line under the condition of a hot line is an operation on a ladder by a workman carrying an overhead line tester and is very dangerous. SOLUTION: A plurality of insulating pipes 1, 2, 3 with conductive connectors 1a, 1b of a male type at one end and a female type at the other end, which contain an electric wire E1 for interconnecting both of the connectors are prepared, and the male type and the female type connectors are connected one by one to each other to make a bar-like body, and a hook H is installed into an uppermost pipe 1 and a grounding wire L is installed into lowermost pipe 3. Large resistance R1 is put in the pipe 1 to lower 1500V to an extent of 1.5V and small resistance R2 is put in the pipe 3 to make it feasible to read an attached voltmeter M.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring rod capable of measuring the voltage of a high-altitude electric wire on the ground as a live wire.

[0002]

2. Description of the Related Art In a train line, it is necessary to measure the voltage of a 1500 V electric wire in a live state in order to know the voltage drop during train operation. In this case, the measurement operator puts a ladder on the structure near the measurement point and measures it using an overhead line tester. The overhead line tester is a 40 cm long insulating pipe with a hanger at the upper end and a grounding wire hanging at the lower end.
There is a megohm, and a voltmeter with a milliampere display is attached. If you hook the hook to a 1500V feeder,
A current of 1.5mA flows to indicate 1500V. Since it is a work on a ladder, there is a risk of falling or an electric shock from the operating grip in the event of an accident, and there has been a demand for a device that can be measured on the ground. Particular attention was paid to the work when it rained.

[0003]

[Means for Solving the Problem] In order for a ground worker to hook an electric wire at a high place, a rod having a length of about 6 m is required. This rod is made of an insulated pipe, and can be transported, for example, divided into three parts, which can be assembled into one on site. A hook is provided on the top pipe, a grounding wire is connected to the lower gripping pipe, and an electric wire is connectably arranged in each pipe to form a circuit leading from the hook to the grounding wire. The top pipe has 15 feeder wires.
High resistance (100M) that can reduce 00V to about 1.5V
Ω). Attach a voltmeter to the lower grip pipe,
If a small resistance (100KΩ) is inserted and the electric wire is 1500V, 0-1.5V is applied to the voltmeter accurately. With the above configuration, the pointer of the voltmeter can be deflected and the voltage of the electric wire can be known.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, this measuring rod is made by connecting three insulating pipes 1, 2 and 3. The upper and lower ends of each pipe are made of conductive male connectors 1a, 2a ... And female connector 1b. , 2
It is inserted and fixed in b ... (Fig. 2). The three pipes are assembled into one by screwing the protrusions and recesses together. The connector 1a at the upper end is provided with a hook H and can be locked to the feeder K. Further, the ground wire L is connected and hung down to the lowest end connector 3b.

As shown in FIG. 2, the electric wire E1 in the pipe 1 is pulled out from a hole formed in the side wall of the pipe 1 near the lower end, but a terminal 4 is provided at the outer end, and the connector 1b is provided by this terminal.
To be fixed. The outer circumference of this portion is covered with an insulating cover cylinder 5. The upper and lower ends of the pipes 2 and 3 have the same structure, and the electric wires E2 and E3 are fixed to the corresponding connectors, respectively, and are also covered with the cover tube 6. The pair of connectors do not hinder the conduction due to the contact surface and the threaded portion. The hook H is electrically connected to the ground line L.

As shown in FIG. 1, a large resistance R1 (100 MΩ) is inserted in the electric wire E1 in the pipe 1, and the voltage of the feeder K is 15
00V is stepped down to about 1.5V. A small resistance R2 (100 KΩ) is inserted into the pipe 3 held by the operator,
When the feeder is 1500V, the attached voltmeter M is 0-1.5V
Is adjusted to show. If the maximum measured value of the voltmeter M is set to 1.5 V or higher (for example, 2 V), the measured voltage of the feeder becomes 1500 V or higher (for example, 2000 V).

[0007]

When the large resistance R1 is 100 MΩ, for example,
Two 50 MΩ commercially available rod-shaped bodies having a diameter of 8 mm and a length of about 80 mm are connected in series to enable the above-mentioned pressure reduction. Therefore, the pipe used has an outer diameter of 2 from the operation grip to the tip.
It is about 8 to 34 mm, and the total weight is about 5 kg. It is easy for even one operator to lift the measuring rod upright.

[0008]

[Effect] Eliminates ladder work. Since the voltage to be measured is greatly reduced at the top due to the large resistance, even if there is an accident such as a crack or breakage in a part of the rod, there is no risk of the operator being damaged by the high voltage.

[Brief description of drawings]

FIG. 1 is a front view of a measuring rod in a use state.

FIG. 2 is a front view showing a connecting portion of two pipes.

[Explanation of symbols]

 1,2,3 Pipe 1b Female connector 2a Male connector 4 Terminal 5,6 Cover tube K Electric wire L Ground wire H Hook R1, R2 Resistance E1, E2, E3 Electric wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayoshi Kobayashi 6-5-19 Minami-Shinagawa, Shinagawa-ku, Tokyo Sanwa Techk Co., Ltd. (72) Minoru Koike 6-chome, Minami-Shinagawa, Shinagawa-ku, Tokyo No. 5-19 Sanwa Techk Co., Ltd.

Claims (2)

[Claims] 1. A plurality of insulative pipes, each of which has a male conductive connector on one end and a female conductive connector on the other end, which is fixed by covering the outer periphery with an insulating cover tube and has an electric wire connecting both connectors inside, In the rod-shaped body that is screwed to the next in the concave part of the connector and is connected to the upper connector and the hanger to the lower connector, a large resistance is applied to the electric wire in the uppermost pipe and to the electric wire in the lowermost pipe. A live-line voltage measuring rod characterized in that a small resistance is inserted in each and a voltmeter is provided in the lowermost pipe. 2. In a connecting portion between a connector and an insertion pipe, an end of an electric wire in the pipe is drawn out of the pipe through a side hole formed in the pipe, and a terminal at the end is fixed to an outer periphery of the connector,
2. This part is covered with an insulating cover cylinder.
Connection structure between the electric wire in the pipe and the connector.