JPH02703Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a withstand voltage testing device for various transformers used in audio equipment and video equipment.

Conventional configuration and its problems In the conventional test device, as shown in FIG. 1, a pair of contacts 6 such as test rods or jigs are led out from the test device main body 5 via lead wires. When performing a withstand voltage test between, for example, the primary coil 2 and the secondary coil 3 of the transformer under test 1, the contactor 6 is brought into contact with the primary coil 2 and the secondary coil 3,
A predetermined voltage was applied from the test device main body 5 to the contact 6. However, when the contactor 6 is not in contact, there is a problem in that even if the product is defective, it is determined to be a good product.

Purpose of the invention In view of the above-mentioned problems, the present invention aims to provide a withstand voltage testing device that can detect whether or not the contacts are in contact.

Structure of the invention In order to achieve this objective, the invention provides a first contact for applying a test voltage and a second contact different from the first contact, and a gap between these two contactors. Provided is a withstand voltage testing device for a transformer, which is provided with a continuity detection circuit, and is capable of confirming the contact state of the first contact with the continuity detection circuit, and determining whether or not a test voltage is applied.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 2 to 4. Components that are substantially the same as those described in FIG. 1 are designated by the same reference numerals and their description will be omitted. FIG. 2 shows a state where the withstand voltage between the primary coil 2 and the secondary coil 3 is being tested in the same way as FIG. 1. 7 is a pair of first contacts that apply a predetermined voltage for testing similar to the contact 6 in FIG. 1; 8 is a pair of first contacts provided separately from this first contact 7; There are two contacts, each of which is brought into contact with the primary coil 2 and secondary coil 3 at a distance from each other. 9 is a continuity detector that detects the continuity state between these first and second contacts 7 and 8; the first and second contacts 7 and 8 and continuity detector 9 detect the object to be detected. A continuity detection circuit 10 is configured that is closed by contact with the primary coil 2 or the secondary coil 3. Incidentally, as the continuity detector 9, one having a configuration as shown in FIG. 4 can be adopted. That is, in FIG. 4, 11 is an AC power supply, 12 is a power supply transformer for continuity testing, 13 is a continuity current detection transformer, 1
4 is a conduction current detection transistor, 15 is a DC power supply, and 16 is a conduction signal load. When a continuity test voltage is applied between the first and second contacts 7 and 8 by the power transformer 12, it is confirmed that there is continuity. When the continuity detection circuit 10 is closed, current flows, which turns on the detection transistor 14 via the detection transformer 13 and operates the continuity signal load 16. If there is no continuity, the continuity detection circuit 10 does not close. Do not work. This continuity detection circuit 9 can be incorporated into the test device main body 5. 4 is the iron core of the transformer 1.

In the above configuration, the first contactor 7 and the second
The contactor 8 is brought into contact with each of the primary coil 2 and the secondary coil 3 to be subjected to a withstand voltage test,
A predetermined voltage is applied between the first contacts 7 and 7 by the test device main body 5, and the primary coil 2 and the secondary coil 3 are
Perform a pressure test between At that time, the first contact 7
If the second contact 8 is in contact, the continuity detector 9 operates as described above to confirm the contact state,
It is confirmed that the pressure test was carried out normally.
Further, when the test voltage from the test device main body 5 is not applied due to poor contact, this can be determined because the continuity detector 9 does not operate.

FIG. 3 shows a state in which a voltage resistance test is being performed between the primary coil 2 and the iron core 4, and the operation is the same as the explanation in FIG. 2.

Effects of the Invention According to the withstand voltage testing device of the present invention, as is clear from the above description, the first contact to which the test voltage is applied and the second contact different from the first contact Since a continuity detection circuit is provided between the two contactors, it is possible to detect a contact failure between the contactors, and it is no longer possible to judge a defective product as a non-defective product due to a contact failure.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of a conventional example, Figures 2 and 3
The figure shows one embodiment of the present invention, Figure 2 is a schematic configuration diagram of a state in which a withstand voltage test is being performed between the primary coil and secondary coil, and Figure 3 is a withstand voltage test between the coil and the iron core. FIG. 4 is a circuit diagram of an example of a continuity detector. 1 is a transformer, 2 is a primary coil, 3 is a secondary coil, 4 is an iron core, 5 is a test device main body, 7 is a first contact, 8 is a second contact, 9 is a continuity detector, 10
is a continuity detection circuit.

Claims (1)

[Scope of utility model registration request] a first contact for applying a test voltage;
1. A withstand voltage testing device for a transformer, characterized in that a second contact separate from the second contact is provided, and a continuity detection circuit between the two contacts is provided.