JPH0134100Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire temperature measuring device that measures the temperature of a wire in an energized state.

Conventional technology involves (1) attaching an FM live-wire thermometer to the wire in advance, receiving radio waves from the thermometer, and measuring the temperature based on changes in frequency; or (2) using a live-wire tool to measure the temperature. A metal fitting is attached to an electric wire, and the value of a display meter attached to the metal fitting is read through a telescope, or radio waves from a temperature sensor are received by a receiver and displayed on a display meter. However, the wire temperature drops due to the heat capacity of the metal fittings of the measuring device that come into contact with the wire, making it impossible to measure the wire temperature accurately.
There are problems in that the measuring device becomes large-scale and the measuring work becomes complicated.

An object of the present invention is to provide a simple and simple wire temperature measuring device that can accurately measure the temperature of a wire in an energized state.

In order to achieve this purpose, the wire temperature measuring device of the present invention uses a hook that is hooked on the wire, a heat insulating layer provided on the inner surface of the hook, a temperature sensor provided protruding from the heat insulating layer, and a temperature sensor that is connected to the hook and the universal joint. It is equipped with a signal line that leads the output of the connected insulating rod and temperature sensor to below the joint.

Embodiments of the present invention will be described with reference to the drawings. The hook 1 is formed of a metal band made of aluminum or the like in an inverted J shape, and functions as a hook that can be hooked onto an electric wire at its upper end. The lower end of the hook 1 is connected to the upper end of an insulating rod 3 via a universal joint 2.
The universal joint 2 includes an intermediate metal fitting 6 having a tongue-like part that is hinged to the lower end of the hook 1 via a pin 4 and a fork-like part provided below the tongue-like part, and a pin attached to the fork-like part of the intermediate metal fitting 6. It consists of a lower metal fitting 7 having a tongue-shaped portion hingedly connected through a tongue portion 5 and a sleeve portion provided below the tongue portion into which the end portion of the insulating rod 3 is inserted and compressed and fixed. The axes of the pins 4 and 5 of the joint 2 are oriented perpendicularly to each other, and the pin 4 penetrates and connects the lower end of the hook 1 and the upper end of the intermediate fitting 6, and the pin 5 connects the lower end of the intermediate fitting 6. The lower end and the upper end of the lower metal fitting 7 fixed to the upper end of the insulating rod 3 are connected to each other by passing through the lower end. The joint 2 allows the hook 1 to pivot about the axis of the pins 4, 5 relative to the insulating rod 3. The heat insulating layer 8 is made of Teflon resin, is attached to the inner surface of the hook portion of the hook 1 with screws 9 and 10, and comes into contact with the outer peripheral surface of the electric wire. Temperature sensor 1
1 has a heat receiving part made of, for example, a thermistor and slightly protruding from the heat insulating layer 7, and is fixed to the hook 1. When the hook portion of the hook 1 is hooked onto an electric wire, the temperature sensor 10 contacts the top of the cross section of the electric wire and changes its resistance in relation to the wire temperature. The box 12 is fixed to the lower side of the hook 1 and houses a power source, a constant voltage device, and an electro-optical converter therein. The constant voltage device and the temperature sensor 11 are connected to each other via a lead wire 18 that is inserted into a groove of the hook 1 and extends, and the current flowing through the lead wire 18 changes as the resistance of the temperature sensor 11 changes. . The current associated with the resistance change of temperature sensor 11 is converted into an optical signal by an electro-optical converter in box 12 and transmitted via optical fiber 19 to indicator 20 at the bottom of insulating rod 3. The upper end of the optical fiber 13 is a photo connector 21
The photo connector 21 can be removed from the box 12 when transporting the measuring device. Note that the temperature sensor 11 is not limited to a thermistor, and other sensors such as a thermocouple can be used.

The measurer holds the lower end of the insulating rod 3 with his/her hand, and
Hook the hook part of hook 1 onto the electric wire. Hook 1
When hooking the wire to the wire, the hook 1 can be swung around the axes of the pins 4 and 5 relative to the insulating rod 3 by the action of the joint 2, making the hooking work more efficient in various locations. This can be done easily and the hook 1 can be reliably hooked onto the electric wire. The wire does not come into direct contact with hook 1,
Since the heat insulating layer 8 is interposed between the wire and the hook 1, the wire temperature is prevented from decreasing due to the heat capacity of the hook 1, and the wire temperature can be detected accurately. Since the wire temperature is displayed on the display meter 20 in the hand of the measurer, reading the measured value becomes very easy. Furthermore, since most of the measurement signals are transmitted by optical signals in the optical fiber 19, the influence of noise can be suppressed. In addition, only the insulating rod 3 and the optical fiber 19 are present in the vicinity of the measuring person, and since they are completely insulated from the electric wires, the measuring work can be made extremely safe.

As described above, according to the present invention, as a result of hooking the hook to the electric wire through the heat insulating layer, a drop in the temperature of the electric wire due to the heat capacity of the hook is avoided, and a vertical two-way
Since the hook can be swung relative to the insulating rod in the direction,
The hook can be reliably hooked onto the wire, and the wire temperature can be accurately measured. In addition, since the output of the temperature sensor is transmitted to the measuring person's hand via a signal line, the measuring device is extremely simple and
Measurement work becomes extremely efficient.

[Brief explanation of the drawing]

The drawing is a block diagram of an embodiment of the present invention. 1...Hook, 2...Joint, 3...Insulating rod, 8
... Insulating layer, 11 ... Temperature sensor, 18 ... Lead wire, 19 ... Optical fiber.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A hook hooked onto an electric wire, a heat insulating layer provided on the inner surface of this hook, a temperature sensor provided protruding from this heat insulating layer, an insulating rod connected to the hook via a universal joint, and a temperature sensor An electric wire temperature measuring device characterized in that it is equipped with a signal line that guides the output from below the joint. 2. Utility model registration claim 1, characterized in that the signal line has a conducting wire portion connected to a temperature sensor and an optical fiber portion connected to the output side of this conducting wire portion wire temperature measuring device. 3. The wire temperature measuring device according to claim 2, wherein the heat insulating layer is made of Teflon resin.