JPH023144B2 - - Google Patents

Description

[Detailed description of the invention] In the insulation test of electrical equipment, such as high-voltage transformers, induction tests, switching impulse tests, and lightning impulse tests are important items, but these tests are generally performed in the first stage. This is done using circuits such as those shown in Figures a, b, and c.

In the figure, 1 is a transformer, with a high voltage coil 2, a low voltage coil 3, a high voltage bushing 4, and a high voltage neutral bushing 5.
and a low pressure bushing 6.
7 is a high frequency generator.

However, especially in high-voltage transformers, if the induction test is performed using the circuit shown in Figure 1 a, airborne corona is likely to occur from the tip of the high-voltage bushing 4, which makes it difficult to measure partial discharge during the induction test. In practice, as shown in FIG. 2a, the high-voltage bushing 4 is removed and the test is conducted on a circuit in which the high-voltage part is not exposed to the atmosphere.
In this way, airborne corona will not occur, so
Highly accurate partial discharge testing becomes possible. Furthermore, in the opening/closing impulse test, if the test is performed using the circuit shown in Figure 1b, a large insulation distance is required from the tip of the high-voltage bushing 4 to the walls and ceiling of the test room, and a huge laboratory is required. So, the second
A circuit as shown in Figure b is used. In the figure, 8 is an impulse voltage generator, 9 is a bushing in oil for high-voltage lead termination, and 10 is a high-voltage lead termination box, and the other parts are the same as those in FIG. 1a. Furthermore, since there is no other way to conduct the impulse test other than by testing with the circuit shown in FIG. 1c, this circuit is used. In this case, each time the test items change, time-consuming operations such as attaching and detaching the long high-pressure bushing 4 and draining and injecting insulating oil are required, which poses a serious problem of reducing the utilization rate of expensive test equipment.

This invention was made to solve the problems of the conventional ones as described above, and includes a bushing, a tank connected to the bushing, a disconnector built in the tank and operable from outside the tank. Provided is an insulation testing device that is equipped with a fluid insulating material filled in the tank described above, and can significantly shorten the time required for test preparation and testing, thereby improving the utilization rate of test equipment. The purpose is to

Hereinafter, the configuration of an insulation testing apparatus according to an embodiment of the present invention will be explained with reference to FIG.

In the figure, 11 is a main body tank, 12 is a bushing provided on one side of this main body tank 11, and 1
Reference numeral 3 denotes a disconnector housed within the main body tank 11, which is composed of fixed contacts 13a, 13c and a movable contact 13b for opening and closing both. 14 is a lead for electrically connecting this disconnector 13 and the bushing 12; 15 is an operating shaft for operating the disconnector 13; and an operation box 16 provided outside the main tank 11.
Driven by. 17 is a temporary lid that seals the other side of the main tank 11; 18 is a fluid insulator such as insulating oil or SF ₆ insulating gas that is filled in the main tank 11; and 19 is a lead drawn out from the fixed contact. , during testing, is connected to the device under test via bushings.

Figures 4a, b, and c show the circuits used to perform each test using the insulation test equipment in Figure 3, where a is the induction test, b is the switching impulse test, and c
represent lightning impulse tests, respectively. As described above, by using the device of the present invention, the test circuit can be switched only by operating the disconnector 13 (of course, changing the test device is necessary), so the test time is shortened and expensive test equipment can be changed. It has the effect of improving utilization rate. This effect is particularly noticeable in development tests, etc., where various test items must be changed frequently. If necessary, if the disconnector is provided with a function to ground the lower fixed contact in the open state,
The work of grounding during testing becomes easier and more convenient. Although the above embodiments have been described using a transformer as an example, it goes without saying that the present invention can also be applied to other electrical equipment such as a reactor.

As described above, according to the present invention, there is provided a bushing, a tank connected to the bushing, a disconnector built in the tank and operable from outside the tank, and a fluid insulator filled in the tank. By including this, it is possible to provide an insulation testing device that can significantly shorten the time required for test preparation and testing and improve the utilization rate of test equipment.

[Brief explanation of drawings]

Figures 1a, b, and c are circuit diagrams showing various insulation testing methods for transformers; Figures 2a and b are circuit diagrams showing induction testing and switching impulse testing methods for high-voltage transformers;
FIG. 3 is a diagram showing a schematic configuration of an insulation testing device in an embodiment of the present invention, and FIG.
It shows the case where each test is performed using the insulation testing apparatus shown in the figure, in which a is a circuit diagram for conducting an induction test, b is a circuit diagram for conducting an opening/closing impulse test, and c is a circuit diagram for conducting a lightning impulse test, respectively. In the figure, 11 is the main tank, 12 is the bushing,
13 is a disconnector, and 18 is a fluid insulator. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] 1 A tank filled with a fluid insulator and connected to the electrical equipment under test, a first bushing connected to this tank, a tank built in the tank that connects the first bushing and the high-voltage coil of the electrical equipment under test. A disconnector that electrically connects or disconnects the circuit, an operation box that allows the disconnector to be operated from outside the tank, an impact voltage generator that generates an impact voltage, a high-frequency power source that generates a high-frequency voltage, and the electrical equipment under test. A second bushing connected to a low-voltage coil is provided, and during an induction test and a switching impulse test, when the disconnector is opened by the operation box, the high-frequency power source or shock voltage is generated through the second bushing. A test voltage is generated from the device to the low-voltage coil of the electrical equipment under test, and during a lightning impulse test, the shock voltage generator is connected to the electrical device through the first bushing with the disconnector closed by the operation box. An insulation testing device characterized by generating a test voltage to a high-voltage coil of a test electrical device.