JPS5822141Y2 - Surge absorber inspection equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an inspection device for inspecting the presence or absence of a failure in a surge absorber in which a capacitor and a resistor are connected in series.

Fig. 1 is an explanatory diagram showing the conventional method of testing the surge absorber for failure. 1 is a function selection switch, 4 is a meter pointer built into the tester 2, 5 is an output terminal of the tester 2, and 6 is an inspection rod connected to the output terminal 5.

That is, as shown in the figure, after selecting an appropriate resistance range for the knob 3 of the tester 2, the test rod 6 is brought into contact with both ends of the surge absorber 1.

If there is no failure in the surge absorber 1, the charging current of the surge absorber 1 causes the pointer 4 to swing from an infinite resistance value to an intermediate resistance value, and then return to an infinite resistance value.

However, if surge absorber 1 is malfunctioning, pointer 4
However, in the conventional method, if the surge absorber 1 is connected in parallel to a coil such as a relay, a closed circuit is established through this coil. Since the surge absorber 1 is formed and current continues to flow, it is difficult to determine whether the surge absorber 1 is malfunctioning or not, and there is a drawback that the malfunction cannot be inspected unless the surge absorber 1 is disconnected from the coil.

This invention aims to improve the above-mentioned drawbacks.

In order to achieve this purpose, this invention has the following structure.

In other words, in a device for inspecting a surge absorber in which coils are connected in parallel, a critical voltage detection device is equipped with a series circuit of a DC power source and a switching element, and a voltage detection element that is connected in parallel with the series circuit and operates at a predetermined voltage or higher. It includes a circuit and a test rod connected to the terminal of the voltage detection element.

An embodiment of this invention will be described below with reference to FIG.

In the figure, 1 is a surge absorber formed by connecting a resistor 1a and a capacitor 1b in series;
8 is a critical voltage detection circuit, 9 to 12 are parts constituting the critical voltage detection circuit 8, 9 is a battery, 10 is a switch, and 11 operates at a predetermined voltage or higher. A rising voltage detection element such as a neon tube, 12 a terminal,
13 is a test rod connected to the terminal 12.

After the switch 10 configured as described above is closed, the switch 10 is opened with the test rod 13 in contact with the terminals 1c and 1d of the surge absorber 1.

At this time, a high voltage is generated between terminals 7a and 7b of the coil 7 due to a back electromotive force.

When the surge absorber 1 is normal, this high voltage is absorbed by the surge absorber 1 and the neon tube 11 does not light up.

Furthermore, if the surge absorber 1 is out of order, a high voltage is applied between the terminals 12 of the neon tube 11, so the neon tube 11 lights up.

In this way, it is possible to test whether or not the surge absorber 1 is out of order.

FIG. 3 shows an application example of this invention, in which the surge absorber 1 is separated from a circuit such as a relay, so that it can be inspected for failure even when it is alone.

In the figure, the same reference numerals as in FIG. 2 indicate the same casing or corresponding parts, 11 to 15 are parts constituting the critical voltage detection circuit 8, 14 is an inductance element such as a coil, and 15 is a switch.

By closing the switch 15, a circuit equivalent to that shown in FIG. 2 is formed, so by closing and opening the switch 10, the same operation as that shown in FIG. 2 is performed, and the surge is suppressed. The presence or absence of a failure in the absorber 1 can be inspected.

Furthermore, if a coil I such as a relay is connected in parallel to the surge absorber 1, the circuit becomes exactly the same as the circuit shown in FIG. 2 by opening the switch 19. The presence or absence of a failure in the surge absorber 1 can be inspected by opening the circuit.

In the above embodiment, a neon tube is used as the critical voltage detecting element 11, but the present invention is not limited to this, and for example, a light emitting diode may be used.

As mentioned above, when using this invention, even when a coil such as a relay is connected to the surge absorber in parallel,
It is possible to easily inspect the surge absorber for failure.

Furthermore, when a surge absorber is used alone, the same inspection can be performed by simply adding an inductor element to the circuit.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the state of inspection using a conventional device;
FIG. 2 is a circuit diagram of an embodiment of this invention, and FIG. 3 is a circuit diagram of an applied example. In the figures, the same reference numerals indicate the same or corresponding parts, 8
is a critical voltage detection circuit, 8 is a DC power supply, 10 is a switch, 1
1 is a voltage detection element, 12 is a terminal, 13 is a test rod, and 14 is an inductance element.

Claims (1)

[Claim for Utility Model Registration] A device for inspecting a surge absorber in which coils are connected in parallel, comprising a series circuit of a DC power source and a switching element, a voltage detection element connected in parallel with the series circuit and operating at a predetermined voltage or higher. A surge absorber testing device comprising: a critical voltage detection circuit equipped with a critical voltage detection circuit; and a test rod connected to a terminal of the voltage detection element.