JPH06201749A - Defective insulation inspecting device for electric apparatus - Google Patents

Abstract

PURPOSE:To easily judge the quality of the insulation state of an electric apparatus in advance without requiring a professional electrician. CONSTITUTION:A defective insulation inspecting device is provided with an insulation resistance measuring instrument 14 measuring the insulation resistance of an electric apparatus 2, a line continuity tester 15 testing the presence of the open circuit of an earth line, the first lamp 6a lighted when the insulation resistance measured by the insulation resistance measuring instrument 14 is a prescribed value or above, the second lamp 6b lighted when the line continuity tester 15 detects that the earth line has no open circuit, and a seal issuing machine 10 issuing a prescribed clearance seal when the insulation resistance value is the prescribed value or above and the earth line has no open circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting insulation defects of electric appliances such as portable power tools used in factories, buildings and civil engineering works.

[0002]

2. Description of the Related Art In the past, electricians used an exclusive insulation resistance measuring instrument to measure the insulation resistance of electric appliances brought into a work place to inspect the quality of insulation of the electric appliances in advance. .

[0003]

However, the electrician who is the measurer is not always at the work place, and when the electric work is not at the work place, an electric appliance whose insulation state has not been tested is not available. It may be brought to the work place and used. As a result, if the waited electric appliance has poor insulation, there is a risk of interruption of temporary electric leakage, and there is a risk of electric shock due to electric shock by touching an electric appliance through which leakage current flows. In this way, in the past, specialized electricians were required to judge the quality of insulation of electric appliances, and when the electricians were not in the work area, an electric leakage accident occurred due to the use of the electric appliances brought in. I was afraid to do it.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to easily determine in advance whether or not the insulation state of an electric appliance is good without requiring specialized electric work. To be able to judge.

[0005]

In order to achieve the above object, in the insulation failure inspection apparatus of the present invention, a pedestal on which an electric appliance such as an electric tool is mounted, an outlet into which a plug of the electric appliance is inserted, and a receptacle. Connected to the base and the positive electrode of the outlet,
An insulation resistance measuring instrument that measures the insulation resistance of electrical appliances, and a line continuity tester that is connected to the ground electrode of an outlet via a push button and that tests the presence or absence of a break in the ground wire of the electrical appliance when the push button is pressed, A first lamp that lights up when the insulation resistance measured by the insulation resistance measuring device is a predetermined value or more; and a second lamp that lights up when the line continuity tester detects that the ground wire is not broken. And a seal issuing machine which issues a predetermined permission seal when the insulation resistance value is a predetermined value or more and the ground wire is not broken. Further, when the insulation resistance measured by the insulation resistance measuring device is less than a predetermined value, the third lamp that lights up in a color different from the first lamp and the line continuity tester cause a disconnection in the ground wire. The fourth lamp that lights up in a different color from the second lamp when it is detected that the insulation resistance is less than a predetermined value, or that the ground wire is broken. And a speaker that outputs an alarm sound.

[0006]

In the present invention, the electric instrument to be brought in is mounted on the cradle and the plug of the electric instrument is inserted into the outlet so that the insulation resistance measuring instrument measures the insulation resistance. The first lamp lights up. Therefore, the operator can know that the insulation state of the electric appliance is normal by turning on the first lamp. further,
When the push button is pressed, the line continuity tester tests whether or not the ground wire is broken, and when it detects that the ground wire is not broken, the second lamp is turned on. Therefore, the operator can know that the ground wire of the electric appliance is normal by turning on the second lamp. Then, when both the insulated state and the ground wire are normal, a seal is issued to permit the carry-in of electric appliances. In this way, the operator can easily judge whether the insulation status of the electric appliance is good or not and whether the ground wire is broken or not, and only when the insulation status and the ground wire are normal, allow the electric appliance to be brought in. By doing so, it becomes possible to prevent an electric leakage accident due to the use of an electric appliance with poor insulation. On the other hand, when the insulation resistance is less than the predetermined value, the third lamp lights up to notify the insulation failure. Further, when the line continuity tester detects that the ground wire is broken, the fourth lamp lights up to notify the ground wire of the breakage. Further, the speaker outputs an alarm sound when the insulation resistance is less than a predetermined value or when it is detected that the ground wire is broken. In this way, the worker is notified of the poor insulation or the disconnection of the ground wire by the lamp and the speaker, so that the worker can surely know that the electric appliance should not be brought into the work place.

[0007]

Embodiments of the present invention will be described with reference to the drawings. The overall configuration of the insulation failure inspection device of the present invention will be described with reference to FIG.
A pedestal 3 (for example, an iron plate) on which an electric appliance 2 to be tested is mounted is provided on an outer box 1 of the insulation failure inspection device. As the electric appliance 2 to be tested, there are portable electric tools (electric drills, blowers, etc.) used in factories, buildings and civil engineering works. A power plug 4 is attached to the electric appliance 2.

On the front of the outer box 1, a waterproof outlet 5
(With 2P, E), waterproof green lamps 6a, 6b, waterproof red lamps 7a, 7b, waterproof push button 8 for ground wire disconnection test, hole 9 for audio output of built-in speaker, electric appliance 2 A sticker issuing machine 10 for issuing a sticker for permission to bring in each is provided. Also, outer box 1
A power plug 11 and a ground wire 12 (or ground rod) of the device are provided on the side surface of the device. Wheels 13 for movement are attached to the bottom surface of the outer case 1.

Next, a schematic circuit diagram of the insulation failure inspection apparatus of the present invention will be described with reference to FIG. On the pedestal 3, the electric device 2 which is the device under test is mounted. The pedestal 3 includes an insulation resistance measuring device 14 (Megger) and a line continuity testing device 15 (tester).
Is connected to the ground wire 12.
A power plug 4 is connected to the electric appliance 2.
Furthermore, an outlet 5 into which the plug 4 of the electric appliance 2 is inserted is provided. The insulation resistance measuring device 14 for measuring the insulation resistance of the electric device 2 is connected to the pedestal 3 and the positive electrode 51 of the outlet 5. Then, the power switch of the insulation resistance measuring instrument 14 is mechanically pushed in by the negative electrode 53 of the plug 4 of the electric device 2 inserted.

The line continuity tester 15 for testing whether or not the ground wire is disconnected is connected to the ground electrode 52 of the pedestal 3 and the outlet 5. A push button 8 is provided between the ground electrode 52 of the outlet 5 and the line continuity tester 15. When the push button 8 is pressed, the line continuity tester 15 tests whether or not the ground wire of the electric device 2 is broken.

The insulation resistance measuring device 14 is connected to the speaker 16 via the red lamp 7a, and further the green lamp 6 is connected.
connected to a. When the insulation resistance measured by the insulation resistance measuring device 14 is less than a predetermined value (for example, less than 1 MΩ), the red lamp 7a is turned on to notify the insulation failure of the electric appliance 2. At the same time, an alarm sound (buzzer) is generated by the speaker 16. On the other hand, when the insulation resistance measured by the insulation resistance measuring device 14 is equal to or higher than a predetermined value (1 MΩ or higher), the green lamp 6a is turned on to notify that the electric appliance 2 is in a normal insulation state.

The line continuity tester 15 is connected to the speaker 16 through the red lamp 7b, and further the green lamp 6b.
connected to b. The line continuity tester 15 is an electric device 2
When it is detected that the earth wire is broken, the red lamp 7b is turned on to notify the earth wire of abnormality. At the same time, an alarm sound is generated by the speaker 16. On the other hand, when the line continuity tester 15 detects that the ground wire is not broken, the green lamp 6b is turned on to inform that the ground wire of the electric appliance 2 is normal.

Further, the insulation resistance measuring device 14 and the line continuity testing device 15 are also connected to the seal issuing machine 10,
The insulation resistance measured by the insulation resistance measuring device 14 is a predetermined value or more (1 MΩ or more), and the line continuity tester 15
Detects that the ground wire is not broken,
A sticker for permission to bring in the electric appliance 2 is issued. At this time, the speaker may generate a predetermined electronic sound (for example, a chime such as "piphon").

Finally, the operation of the insulation failure inspection apparatus of the present invention will be described. First, the electric appliance 2 to be brought to the work place is placed on the pedestal 3. Next, the plug 4 of the electric appliance 2 is inserted into the outlet 5 of the device. As a result, the insulation resistance measuring device 14 is turned on and the insulation resistance of the electric appliance 2 is measured. When the insulation resistance measured by the insulation resistance measuring device 14 is less than a predetermined value (less than 1 MΩ), the red lamp 7a is turned on and the speaker 16 produces an alarm sound.
Thereby, the worker can know the insulation failure of the electric device 2. On the other hand, when the insulation resistance measured by the insulation resistance measuring device 14 is a predetermined value or more (1 MΩ or more), the green lamp 6a is turned on. As a result, the worker can
It can be known that the insulation state of is normal.

Further, when the operator presses the push button 8 to cause the line continuity tester 15 to test whether or not the ground line is disconnected, and when the line continuity tester 15 detects that the ground line is disconnected, The red lamp 7b is turned on and the speaker 16 emits an alarm sound. This allows
The operator can know the disconnection of the ground wire of the electric device 2. On the other hand, when the line continuity tester 15 detects that the ground wire is not broken, the green lamp 6b is turned on. Thereby, the operator can know that the ground wire of the electric appliance 2 is normal.

Then, when the insulation resistance measured by the insulation resistance measuring device 14 is a predetermined value or more (1 MΩ or more) and the line continuity testing device 15 detects that the ground wire is not broken, the seal is applied. The issuing machine 10 is an electric device 2
We will issue a seal of permission to bring in. As a result, the worker is permitted to bring the electric appliance 2 only when the insulated state of the electric appliance 2 and the ground wire are normal, so that it is possible to prevent a leakage accident due to the use of the poorly insulated electric appliance 2. . As described above, according to the present embodiment, even an amateur can easily operate the device, so that the work of the electrician is not bothered. Furthermore, the construction stoppage due to the interruption of the temporary electric leakage can be minimized, and the electric shock accident due to the electric leakage tool can be prevented.

[0017]

According to the present invention, before the electric appliance is brought into the work place, it is possible to easily judge the quality of the insulation state without requiring a specialized electrician. Then, by permitting the carry-in of the electric appliance only when both the insulated state and the ground wire are normal, it is possible to prevent a leakage accident due to the use of the electric appliance. Further, since the worker is notified of the insulation failure or the abnormality of the ground wire by the lamp and the speaker, the worker can surely know that the electric appliance should not be brought into the work place.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit conceptual diagram of an insulation failure inspection apparatus of the present invention.

FIG. 2 is a diagram showing an overall configuration of an insulation failure inspection device of the present invention.

[Explanation of symbols]

 2 Electric appliances 3 Cradle 5 Outlet 6 Green lamp 7 Red lamp 8 Push button 10 Seal issuing machine 14 Insulation resistance measuring instrument 15 Line continuity tester 16 Speaker

Claims (2)

[Claims] 1. A pedestal on which an electric appliance such as an electric tool is mounted, an outlet into which a plug of the electric appliance is inserted, and an insulation resistance measuring device which is connected to a positive electrode of the cradle and the outlet and measures an insulation resistance of the electric appliance. And a line continuity tester that is connected to the grounding electrode of the outlet via the push button, and tests whether the ground wire of the electrical appliance is disconnected when the push button is pressed, and the insulation resistance measured by the insulation resistance measuring device is specified. A first lamp that lights when the value is equal to or higher than the value, a second lamp that lights when the line continuity tester detects that the ground wire is not broken, and an insulation resistance value is equal to or higher than a predetermined value and the ground wire An insulation failure inspection device for an electric appliance, comprising: a seal issuing machine that issues a predetermined permission seal when no wire breakage occurs. 2. A third lamp that lights up in a color different from that of the first lamp when the insulation resistance measured by the insulation resistance measuring device is less than a predetermined value, and the line continuity tester is connected to the ground wire. A fourth lamp that lights up in a color different from that of the second lamp when a disconnection is detected, and that the insulation resistance is less than a predetermined value, or that the ground wire is disconnected. 2. An insulation failure inspection device for an electric appliance according to claim 1, further comprising a speaker that outputs an alarm sound when the electric field is detected.