JPH0155426B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulation testing device for electrical products such as 500KV class or 1000KV class reactors, electrical insulation leads, and the like.

For example, AC voltage tests, lightning impulse tests, and switching impulse tests are important test items for high-voltage reactor insulation tests. This is done using a circuit like the one shown below.

In the figure, reference numeral 1 denotes a reactor constituting the electrical product under test, which is composed of a coil 2, a line side bushing 3, a neutral point side bushing 4, and an insulating oil 5. 6 is a high frequency generator; 7 is a test transformer that boosts the voltage of the high frequency generator 6 to a predetermined test voltage value;
8 is an AC test voltage generator, and a high frequency generator 6
and a test transformer 7. 9 is a lightning impulse test voltage generator, and 10 is a switching impulse test voltage generator.

When performing an AC voltage test with the configuration shown in Figure 1a, an airborne corona is likely to occur from the tip of the line-side bushing 3, which makes it difficult to measure the partial discharge of the reactor 1 during the AC voltage test. In reality, as shown in Fig. 2, the line side bushing 3 is removed and the reactor 1 is connected to the line through an insulating medium 11 such as insulating oil, which has a higher dielectric strength than air, to prevent the high voltage part from being exposed to the air. The test is performed by connecting the AC test voltage generator 8.

In this way, no atmospheric corona is generated, so that it is possible to measure partial discharge with high accuracy in an AC voltage test. For the lightning impulse test and the switching impulse test, the reactor 1 and the lightning impulse test voltage generator 9 or the switching impulse test voltage generator 10 are connected through the air as shown in FIGS. 1b and 1c, respectively. Since there is no other way but to test with these configurations.

Therefore, each time a test item changes, time-consuming operations such as attaching and detaching the long trackside bushing 3, draining and injecting the insulating oil 5 are required, which is a serious problem in that it reduces the utilization rate of expensive test equipment. occurs.

This invention was made in order to solve the above-mentioned conventional problems, and its purpose is to provide an insulation testing device that can efficiently conduct insulation tests on test electrical products such as high-voltage reactors. That is.

Examples of the present invention will be described below. Figure 3 is a cross-sectional view showing the configuration of the insulation testing device, and Figures 4a, b, and c show the circuits when conducting each test using the insulation testing equipment shown in Figure 3. is AC voltage test, b is lightning impulse test,
c represents the circuit configuration of the opening/closing impulse test.

In each figure, 1, 2, 4 to 11 are the same as those in the conventional example, 21 is a tank, and 22a is a tank 21.
A first terminal 22b is connected to a lightning impulse test voltage generator 9 provided outside the tank or a switching impulse test voltage generator 10 via a bushing 23 provided on one side of the tank 21. A second terminal 22c is connected to the side of the tank 21 via a bushing 24 to which a live part of the AC test voltage generator 8 provided outside the tank is connected through an insulating medium 11 having a dielectric strength greater than that of air. A third terminal 26 is a connection switch housed in the tank 21, and is connected to the reactor 1 provided outside the tank via a bushing 25 provided in the center. 2 terminal 22b,
It is composed of a third terminal 22c and a movable terminal 22d. 27 is an operating shaft for operating the connection switch 26, and is driven from an operating box 28 provided outside the tank 21. 29 is tank 2
1 is an insulating medium such as SF ₆ gas or insulating oil.

In the device configured as described above, the connection switch 26 is operated by the operation box 28, and in the case of an AC voltage test, the second terminal 22b and the third terminal 22c are connected as shown in FIG. 4a. and the movable terminal 22d
In the case of a lightning impulse voltage test or a switching impulse voltage test, the first
The terminal 22a and the third terminal 22c are connected to the movable terminal 2.
2d to switch and connect respectively.

Therefore, the test preparation work that was performed every time the test items changed as in the conventional example above will be simplified, especially in development tests etc. where various test items must be changed frequently. The effect seems to be significant.

If necessary, if the terminal (first or second terminal) on the open side of the switching connector 26 is configured to be grounded, the work of grounding during testing becomes easier and more convenient.

Incidentally, in the above embodiment, the case where each of the first, second, and third terminals is one is explained, but it is also possible to provide a plurality of each of the terminals to increase the number of switchable and connectable circuits. Further, although the case where the electrical product under test is a reactor is shown, it can also be used for testing other electrical products, such as insulated leads.

As described above, according to the present invention, there is provided a tank filled with an insulating medium having a dielectric strength greater than that of air, an impulse test voltage generator provided outside the tank, and an impulse test voltage generator provided in the tank. A first terminal to be connected, a second terminal provided on the tank, and a live part provided outside the tank penetrating through the above or other insulating medium having a dielectric strength higher than that of air to connect the second terminal. an AC test voltage generator connected to the tank, a test electrical product provided in the tank to which the various test voltages are applied, a third terminal provided in the tank to which the test electrical product is connected, and the tank. By providing a connection switch which is provided inside the tank and switches the third terminal to either the first terminal or the second terminal by an operation from the outside of the tank, the test can be performed. This has the effect that it is possible to provide an insulation testing device that can significantly shorten the time required for preparation and improve the utilization rate of testing equipment.

[Brief explanation of drawings]

Fig. 1 a, b, c, Fig. 2 are various insulation test circuit diagrams of a reactor, Fig. 3 is a sectional view of an insulation test apparatus in an embodiment of the present invention, Fig. 4 a,
b and c show the cases in which each test is performed using the insulation testing device shown in Figure 3; a is an AC withstanding voltage test, b is a lightning impulse test, and c is a switching impulse test. It is a diagram showing a circuit. In the figure, 6...High frequency generator, 7... Test transformer,
9... Lightning impulse test voltage generator, 10... Opening/closing impulse test voltage generator, 21... Tank, 22
a, 22b, 22c...first, second, third terminals, 26...connection switch, 11, 29...insulating medium. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A tank filled with an insulating medium having a dielectric strength greater than that of air, an impulse test voltage generator provided outside the tank, and a voltage generator provided in the tank to which the impulse test voltage generator is connected. 1 terminal,
A second terminal provided in the tank, an AC test voltage generation in which a live part provided outside the tank penetrates the above or other insulating medium having a dielectric strength higher than that of air and is connected to the second terminal. a third terminal provided in the tank and to which the various test voltages are applied; a third terminal provided in the tank and to which the test electrical product is connected; The third
An insulation testing device comprising a connection switch that connects a terminal to either the first terminal or the second terminal. 2. The insulation testing device according to claim 1, comprising a plurality of third terminals. 3. The insulation testing device according to claim 1 or 2, wherein the insulating medium filled in the tank is SF ₆ gas.