JPH048378Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Abstract This invention relates to a simple power tool testing machine used in workshops, etc., and its characteristics are that the insulation resistance value of the electrode cord is Equipped with an insulation test circuit that determines the quality of the insulation by comparing it with the reference value of 2, an earth cord test circuit that determines the continuity of the earth cord, and an electrode cord test circuit that determines the presence or absence of short circuits between the electrode cords. insulation test switch installed in the circuit of
By simply pressing the earth test switch and electrode cord test switch, you can test the insulation of the electrode cord of the connected device, the continuity of the earth cord, and the presence of short circuits in the electrode cord, making it compact and lightweight. It is convenient to carry, and
Unlike testers and meggers, it is easy to handle, so anyone can use it, and it can prevent electric shocks and leakage accidents caused by defective power tools.

(b) Background technology and purpose Conventionally, it is desirable to check all power tools used in workplaces for malfunctions before use, but large testers and meggers are inconvenient to carry and difficult to handle. Because checking is so troublesome, people often neglect to check it, which can lead to accidents.

In view of the above points, the purpose of this invention is to provide a simple power tool testing machine that is small and lightweight, can be easily carried, and is easy to handle.

(c) Embodiment An embodiment of this invention will be described with reference to the drawings.

A single-phase 100V tool outlet 2, a single-phase 200V tool outlet 3, and a three-phase outlet into which the power plugs of the equipment to be tested are inserted, respectively, are inserted into the case 1 of a simple power tool equipped with a handle 1a that serves as a support leg during use.
Terminals such as a 200V tool outlet 4, an external ground terminal 5 for connecting the ground wire of the power cord if the power plug does not have a ground terminal, and a test terminal 6 for connecting to the conductor part of the body of the equipment to be tested are provided. There is.

In addition, a push button type insulation test switch 7,
Earth test switch 8, electrode cord test switch 9, and confirmation LEDs 7a, 8a, and 9 that light up when each of these switches is turned on.
a. Three-phase polarity changeover switch 10 used when testing the electrode cord of three-phase equipment; a blue lamp 11 that lights up when the insulation test is good; the earth cord test and the electrode cord test are good. A blue lamp 12 that is turned on at certain times and a power switch 13 for a simple electric tool tester are provided.

A buzzer 14 is provided inside the case 1 to indicate that the insulation test, earth cord test, and electrode cord test are defective.
An insulation test circuit, an earth cord test circuit, and an electrode cord test circuit are provided as shown in FIG. 4, respectively.

(d) Insulation test circuit As shown in Figure 2, the insulation test circuit consists of single-phase 100V tool outlet 2, single-phase 200V tool outlet 3, and three-phase 200V tool outlet 4.
and the test terminal 6 via an insulation test switch 7, and comprises a reference voltage source, first and second reference value setting circuits, two comparison circuits, and the like.

When the insulation test switch 7 is turned on (an electromagnetic relay (not shown) operates), the hot line terminal of the single-phase 100V tool outlet 2, the hot line terminal of the single-phase 200V tool outlet 3, and the three-phase
All terminals of the 200V tool outlet 4 are connected to the insulation test circuit, and the resistance value between it and the test terminal 6 is
When the value is smaller than the first standard value (for example, 5MΩ), the buzzer 14 sounds and the second standard value (for example, 5MΩ) is sounded.
10MΩ), the blue lamp 11 is turned on.

When the resistance value is between the first standard value and the second standard value, neither the blue lamp 11 nor the buzzer 14 operates.

(e) Earth cord test circuit The earth cord test circuit consists of two single-phase 100V tool outlets and a single-phase 200V power outlet, as shown in Figure 3.
It is connected between the ground terminal of the tool outlet 3 and the three-phase 200V tool outlet 4, the external ground terminal 5, and the test terminal, and is operated by turning on the earth test switch 8 to perform a continuity test between them and check the continuity. If it is, the blue lamp 12 lights up, and if it is not conductive, the buzzer 14 sounds to indicate whether it is good or bad.

(f) Electrode cord test circuit As shown in Figure 4, the electrode cord test circuit consists of a single-phase 100V tool outlet 2 and a single-phase 100V tool outlet 2.
It is connected to the three-phase 200V tool outlet 4 between the poles of the 200V tool outlet 3 and through the three-phase polarity switch 10, and detects the presence or absence of a short circuit between the poles with the power switch of the equipment to be tested turned off. However, if there is no short circuit, the blue lamp 12 lights up, and if there is a short circuit, the buzzer 14 sounds to indicate the quality of each.

In the case of three-phase equipment, three-phase polarity switch 1
0 three times and turn on the electrode cord test switch 9 for each time.

(g) How to use When testing electric equipment such as power tools, insert the power plug 15 of the equipment into the corresponding outlet as shown in Figure 5, and if the power plug does not have a ground terminal, connect it to the ground terminal. The wire is connected to the external ground terminal 5, and the conductor portion of the body of the device and the test terminal 6 are connected using the attached lead wire 16.

If the plug does not meet the specifications, use the supplied power cord with an alligator clip on one end and a conforming plug on the other end.

Next, by pressing the insulation test switch 7, the earth test switch 8, and the electrode cord test switch 9 in sequence, the blue lamp 11 or 12 will light up if the judgment result is good, and the buzzer 14 will turn on if the judgment result is bad. beeped and displayed.

During the insulation test, if neither the blue lamp 11 nor the buzzer 14 operates, the judgment is "slightly good" and the device can be used for the time being.

When testing the electrode cord of a three-phase device, the three-phase polarity changeover switch 10 is switched three times and the electrode cord test switch 9 is pressed each time.

(H) Effects As explained above, the power tool simple tester of this invention includes an insulation test circuit that compares the insulation resistance value of the electrode cord with the first and second reference values to determine the quality of the insulation; Equipped with an earth cord test circuit that determines the continuity of the earth cord and an electrode cord test circuit that determines whether there is a short circuit between electrode cords, each circuit is equipped with an insulation test switch, an earth test switch, and an electrode cord. By simply pressing the test switch, it tests the insulation of the connected device's electrode cord, continuity of the ground cord, and short circuit of the electrode cord, making it small, lightweight, and convenient to carry.
In addition, unlike testers and meggers, it is easy to handle, so anyone can use it, eliminating the need for omissions in checking and preventing electric shocks and leakage accidents caused by defective power tools. By comparing the insulation resistance value with the first and second standard values to determine whether the insulation is good or bad, the value between the two standard values is "slightly good".
This has the unique effect of being able to determine whether the insulation of the electrode cord of the device is gradually deteriorating before it becomes defective and making it useful for maintenance.

[Brief explanation of the drawing]

Fig. 1...A perspective view of an embodiment of this invention, Fig. 2...A block diagram of its insulation test circuit, Fig. 3...
Block diagram of the earth cord test circuit, Figure 4...Block diagram of the electrode cord test circuit, Figure 5
Figure: A perspective view showing how it is used. 1...Case, 1a...Handle, 2...Single phase
100V tool outlet, 3...Single phase 200V tool outlet, 4...Three phase 200V tool outlet,
5...External ground terminal, 6...Test terminal, 7...
...Insulation test switch, 8...Earth test switch, 9...Electrode cord test switch, 7a,
8a, 9a... Confirmation LED, 10... Three-phase polarity switch, 11, 12... Blue lamp, 13...
...Power switch, 14...Buzzer, 15...Power plug, 16...Lead wire.

Claims (1)

[Scope of claim for utility model registration] (a) Single phase into which the power plug of the equipment to be tested is inserted
100V tool outlet, single-phase 200V tool outlet, and three-phase 200V tool outlet; (b) external ground terminal to which the ground wire of the power cord of the equipment to be tested is connected; (c) conductor of the body of the equipment to be tested. (d) single-phase test by turning on the test terminal that connects the
100V tool outlet hot line, single phase
The value of the insulation resistance of the electrode cord of the equipment to be tested, which is connected between the hot line of the 200V tool outlet and all terminals of the three-phase 200V tool outlet and the test terminal, is determined from the first reference value and the first reference value. compared with a larger second reference value,
If it is smaller than the first reference value, it is determined to be defective,
In addition, there is an insulation test circuit that determines it is good when the value is greater than the second reference value, and (e) By turning on the earth test switch, the power outlet for single-phase 100V tools, single-phase 200V tool outlet, and three-phase 200V tool outlet is installed. By installing an earth cord test circuit that is connected between the ground terminal of the outlet and the external earth terminal and the test terminal and determines the continuity of the earth cord of the equipment to be tested, and (f) an electrode cord test switch, Single phase 100V tool outlet and single phase
An electrode cord test circuit that is connected between the poles of the 200V tool outlet and between any two poles of the three-phase 200V tool outlet selected by the three-phase polarity switch to determine whether there is a short circuit in the electrode cord; ) A simple power tool testing machine comprising a display means connected to an insulation test circuit, an earth cord test circuit, and an electrode cord test circuit, and displaying judgment results of good and bad, respectively.