JPS5958369A - Diagnostic device for insulation - Google Patents

Abstract

PURPOSE:To reduce the testing time and to improve the reliability of the titled device which evaluates the environmental durability of an insulator, by constituting the device of a vacuum deaerator, device for supplying immersion liquid, such as water, etc., device for measuring an electric characteristic, such as insulation resistance, etc., and others. CONSTITUTION:The titled device is constituted by combining a vacuum deaerator, device for supplying an immersion liquid, such as water, etc., and device for measuring an electric characteristic. In one execution example, for instance, the stator 1 of an induction motor having a rating of 3.300V and 1,800KW is put in a vacuum tank 2 and the degree of vacuum of the vacuum tank is maintained at 1mm.Hg. Then the water in a water tank 3 is introduced to the vacuum drying tank 2 through a valve 4 and the stator 1 is completely soaked in the water. Then air is supplied to the vacuum tank 2 and the tank is maintained at the atmospheric pressure and the insulation resistance of the stator 1 is measured with a megger. The result (b) can be obtained in a shorter time when compared with conventional method, in which the stator 1 is soaked in water under the atmospheric pressure, and the quality of a product can be judged in a short time.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present inventor--Insulation diagnostic device for evaluating the environmental resistance of insulators (
t.

[Technical background of U6 Ming and its problems] Insulators! [! Rotation Ii'+ that applies high and low voltages to i The insulation resistance value of rock-shaped mason rings and the like has a very large value in terms of quality control of the product. In particular, when used outdoors or in a dirty environment such as in the production of paper, the insulation resistance value is considered important. For this reason, it is safe to check the environmental resistance of the product by simulating these [historical conditions] during manufacturing, but conventionally, water immersion tests are conducted downstream of the atmosphere and insulation resistance values are measured. The method was common. In rare cases, there are methods of spraying water vapor or spraying a solution simulating a contaminated environment, but both methods have the major drawback of requiring long testing times.

Furthermore, the reliability of the test is not sufficient, especially in recent years as the environmental conditions for use have become stricter, so the conventional water immersion test of 15 times is not enough. It was much needed.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an insulation diagnosis device for evaluating environmental resistance, which can shorten test time and improve individual requirements.

[Summary of the invention]

In order to achieve the above purpose, this device is a combination of a vacuum deaeration device 6, a device for supplying an immersion liquid such as water, and a device for measuring electrical characteristics such as edge resistance. .

[Implementation 1 of "Emitting"] The present invention will be described in detail below with reference to the drawings. For example, the voltage is 3300V as shown in Figure 1.

A stator 1 of an induction motor rated at 1800 kW is installed directly in a vacuum deaerator, for example, in a vacuum drying tank 2.
', L,, after holding the vacuum knife at l mm Hg,
An example of a device that supplies immersion liquid such as water in advance is water storage tank 3.
Open the pulp 4 and add the water that has been heated to λ9 to the vacuum drying tank 2. Then, the stator 1 was completely immersed. After the vacuum was broken and the pressure returned to atmospheric pressure, the insulation resistance (not shown) was measured on the insulation resistance side (for example, insulating paper). Figure 2 shows the changes over time, along with the results obtained when the stator 1 of the same motor was exposed to water (1 yen) under conventional atmospheric pressure. These are the measurement results of insulation resistance, and the solid line indicates the test results using the device of the present invention. This is the measurement result of the insulation resistance of the air-water test.rl-'i R'
JC is the test result by the conventional method, and the same
The insulation resistance of the material was measured using atmospheric pressure water prior to 1rf of vacuum water.

Even in the 4th luck of the 2nd and 1st, it is clear that the actual selection (h (true water liquid) is the dashed line C (atmospheric pressure water liquid) V and the result is very intelligent, and the results are clear between the two ice cubes. Can judge whether it is good or bad.

Unfortunately, insulation resistance reduction due to minute voids, which cannot be evaluated using atmospheric pressure water, can be evaluated using A-air/water. The replacement is
The fact that the insulation resistance decreases with the use of fresh water means that the environmental resistance of the product can be guaranteed even under severe conditions.

It should be noted that A-nitro-f() can be set arbitrarily depending on the degree of reliability, but in order to shorten the time required for testing iJ-shi', it is preferable to use the high true complex form j21.j.

In the above embodiment, only the case of immersion in water was described, but it goes without saying that this method can also be applied to other m-liquids other than the water plate.

Well, when it comes to evaluating the environmental resistance of insulators, it's a waste of time.
It can also be applied to the tl' value of

In addition, the evaluation of resistance is generally based on insulation resistance, but tan δn [or capacitance -7□] 田'7? You can also use .

〔Effect of the invention〕

As described above, according to the present invention, conventional atmospheric pressure water ζL
It is possible to provide an insulation diagnostic device that can judge the quality of environmental resistance of green materials and dramatically improve its reliability.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing one embodiment of the 7-insulation diagnosis device i9= according to the present invention, and Fig. 2 is a diagram showing the insulation resistance measurement results of materials measured by the conventional method using the device of the present invention. J... Stator of induction motor, 2... Vacuum drying tank,
3... Water tank, 4... Water supply valve. Applicant's agent Patent attorney Takehiko Suzue IM

Claims (1)

[Scope of Claims] A vacuum deaerator in which insulating material for an environmental resistance test is placed and degassed in a vacuum state in advance, and this A-deaerator [materials in the space] An insulation diagnostic device af comprising a device 1, 1 for supplying an immersion liquid such as water to the vacuum degassing device, and a device for measuring insulation resistance and other characteristics of the material immersed in the immersion liquid in the vacuum degassing device. .