JPS6023484B2 - Abnormality monitoring device for oil-filled electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormality monitoring device for oil-filled electrical equipment such as transformers and reactors. Detect and
The present invention relates to a device that automatically monitors abnormalities.

Conventional abnormality monitoring devices of this type detect the concentration of each gas component in oil or the amount of increase thereof to estimate the presence or absence of an internal abnormality in a transformer or the like.

In other words, a gas-in-oil extractor that applies a Torricelli vacuum to a transformer, a gas-in-oil extractor that uses a Teppler pump, a gas-in-oil extractor that uses reciprocating movement of a piston, or a gas-in-oil extractor that uses inorganic or organic materials. Attach a separation membrane, etc., and measure the gas collected using gas chromatography or a combustible gas sensor, and calculate the total amount or ratio, CO
, C2day4, C2day6, C3day6, C3day8, etc. The presence or absence of an internal abnormality in a transformer or the like is determined from the absolute amount of each gas component or the extent of its increase. However, with such conventional devices, it is difficult to automatically and easily know the type of abnormality and its heating temperature. The purpose of the present invention is not only to determine the presence or absence of an abnormality, but also to determine the type of abnormality when it is determined that there is an abnormality, that is, the occurrence of electrical discharge, heating of only insulating oil, or solid insulating material such as insulating paper or press board. To provide an abnormality monitoring device for oil-filled electrical equipment that can automatically and easily determine whether heating is occurring in insulating oil.

In order to achieve this objective, the present invention measures the amount of at least the C component and the C2 component separately in the separated gas, calculates the ratio of the amount of each of these components, and determines that there is an abnormality. In this case, the type of abnormality is determined based on this ratio. Hereinafter, the present invention will be explained in detail with reference to the drawings.

The present inventors have discovered the following from a series of experimental results when oil or an insulator in oil is exposed to electric discharge and heated. {1} The type of abnormality, i.e., electric discharge, heating of only oil, and heating of insulators in oil, and the ratio of the amount of C ratio component and two components in gas in oil, C ratio/
The relationship between day 2 and day 2 is shown in FIG.

■ When only oil is heated, the heating temperature and the ratio of various gas components in the gas in the oil C2 day/C2 day6, C3 is /C
Between 3HB and C2 day 4/C3 day 8, each characteristic line in Figure 2 × (C2 ratio/C2 day 6), Y (C3 ratio/C3 &)
, Z (C2 ratio no C3 day 6).

When glue and insulators are heated together in oil, the heating temperature and the various gas component ratios of the gases in the oil CO/C ratio and CO
2/CO have the relationships shown in FIGS. 3 and 4, respectively.

From the relationships shown in Figures 1 to 4 above, if it is possible to automatically determine the various gas component ratios shown in the figures, it is possible to determine whether the abnormality inside the transformer is due to heating or discharge. It will be very easy to know the difference between the two, and if it is heated, whether it is only oil or whether an insulating material is also included, and even the heating temperature.

Next, an embodiment in which the present invention is applied to a transformer will be described with reference to the schematic configuration diagram shown in FIG. In FIG. 5, 1 is a gas-in-oil extractor that utilizes the aforementioned Torricelli vacuum, a Teppler pump, a piston, a separation membrane, etc.

2 is a gas detector, and gas chromatography or various gas sensors can be used for this gas detector 2.

3 is a calculator that performs calculations based on data measured by the gas detector 2.

This calculator 3 is preset so that calculations can be made as necessary, for example, the amounts of the various gas components mentioned above, or the various gas component ratios shown in FIGS. 1 to 4. 4 is a numerical display device for the results calculated by the calculator 3;

Here, each type of gas component or gas component ratio can be displayed as required. 5 is a device that displays abnormal forms based on the results calculated by the computer 3.

Here, the presence or absence of an abnormality, and if there is an abnormality, the type of abnormality,
For example, it displays whether it is heating or discharging. In addition, if the abnormality is heating, it is possible to display whether it is caused only by the oil, or whether insulators are being heated together with the oil, and the temperature at which they are heated. Each of the above parts 1 to 5 is a series of automated parts, which determines whether or not there is an abnormality in the transformer 6, and if there is an abnormality, the type of abnormality and the abnormality are determined using the characteristics shown in Figures 1 to 4. In the case of heating, it is now possible to measure and display temperatures up to that temperature without anyone being present. Next, a specific example of gas detection for a transformer will be explained.

In FIG. 5, 1 used a gas-in-oil extractor applying Torricelli vacuum, and 2 used gas chromatography.

3 is a calculator that calculates based on the data detected by gas chromatography 2, and calculates the amount of each component of combustible gas and CH
4/ratio, C2 ratio/C2 day 6, C02/CO values can be calculated *.

As mentioned above, numerals 4 and 6 are a display device for the amount of each component of the combustible gas and the gas component ratio, and an abnormal state display device, respectively.

If the total amount of combustible gas is 150 or more, there is an abnormality, and if the CH4/ratio is <0.1, there is a discharge, 0.1mi CH4/
If the abnormality is heating of oil only, if C day/day 2 > 1, it will be displayed on the abnormal form display device 5 as heating of insulating material, and if the abnormality is heating of oil only, C2 day 4/C2 day 6 In the case of heating an insulator, the temperature is displayed as a value of C02/CO. [Specific Examples 1 to 4] Table 1 shows various gas components detected by gas chromatography 2.
In the case of the values shown in , the combustible gas amount and gas component ratio displayed on the component display device 4 are calculated by the calculator 3,
It will look like Table 2.

As a result, the abnormality mode display device 5 shows that there is an abnormality in the specific example 1, only the oil is heated to about 460 qo, there is an abnormality in the specific example 2, the insulator is heated to about 300 qo, and there is an abnormality in the specific example 3. In example 4, "No abnormality" is displayed. Table 1 Unit: PPm Table 2 In the above embodiment, a Torricelli vacuum is applied to the extractor, and gas chromatography is used for gas detection, so the apparatus is complicated and expensive.

Therefore, the following device may be used as a simple and inexpensive device. That is, an example will be described in which a gas component is extracted from oil using a polymer membrane in a gas-in-oil extractor.

In this case, the amount of gas that can be extracted from oil with a polymer membrane is generally the largest in 2 days, followed by C0, C ratio, etc. Therefore, an embodiment will be described below in which the abnormality of the transformer is monitored by detecting these gases that have a relatively large amount of permeation. Since the main components of the gas passing through the polymer membrane are Q, C○, and CH4, the gas sensor 7, the CO gas sensor 8, and the C ratio gas sensor 9 can be used for gas detection, respectively. As shown in FIG. 6, these sensors 7 to 9 are connected to a gas reservoir chamber in which gas that has passed through the polymer membrane 1 from an adapter 12 provided to the transformer 6 via a flange valve 11 is stored. 1
0' is attached. Further, as shown in FIG. 7, the gas reservoir chamber 10 may be provided in the transformer 6 via the polymer membrane 1 for each of the various gas components C0 and CH4. In the calculator 3, the values of day2, C ratio/day2, and CO/C are automatically calculated based on the inputs sent from the gas sensors 7-9. As a result, the values of day 2, C ratio/Q, and CO/CH4 are displayed on the component display device 4. Here, the presence or absence of an abnormality is determined based on the daily amount, and the type of abnormality C is determined based on the /day2 amount. Furthermore, the temperature when the insulator is heated is determined by the value of the CO/C ratio. Although these set values can take arbitrary values, in this example, a daily amount of 400 legs or more is considered abnormal.

The value of CH4/day2 is CM/day2<0.1 according to Figure 1.
When , it is determined that there is a discharge, when 0.1SCH/ratio≦1, it is determined that only the oil is heated, and when the C ratio/day2>1, it is determined that the insulator is heated. [
Specific Examples 5 to 8] When the gas detected by the gas detector 2 has the values shown in Table 3, the CH4/day2 and CO/C ratio displayed by the component display device 4 are as shown in Table 4.

As a result, in the abnormal form display device 5, specific example 5 is abnormal, only oil is heated, specific example 6 is abnormal, and insulator is 50%
000 is displayed as heating, specific example 7 has an abnormality, discharge, and specific example 8 shows no abnormality. Table 3 Unit ÷ pm Table 4 As explained above, according to the present invention, the amounts of at least the CH4 component and the Q component in the gas separated from the insulating oil are measured separately, and the ratio of the amount of each of these components is calculated. The type of abnormality is determined based on this ratio, so when it is determined that there is an abnormality, it is automatically determined whether the abnormality is electric discharge, heating only in oil, or heating in oil containing solid insulators. can be determined quickly and easily.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the relationship between the type of abnormality and C day/day 2,
Figure 2 is a characteristic diagram showing the relationship between heating temperature and various gas component ratios when only oil is heated, and Figures 3 and 4 are heating temperatures and various gas component ratios when an insulator is heated in oil. Characteristic diagrams showing the relationship between component ratios, and FIGS. 5 to 7 are schematic configuration diagrams of abnormality monitoring apparatuses according to embodiments of the present invention. 1... Gas in oil extractor, 2... Gas detector, 3...
・Calculator, 4...Component display device, 5...Abnormal form display device, 6...Transformer. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A system comprising: means for separating gas in insulating oil in oil-filled electrical equipment; and means for detecting various components of the separated gas; For monitoring abnormalities in incoming electrical equipment, means for separately measuring the amount of at least CH_4 component and H_2 component in the separated gas, and means for determining the ratio of the amount of CH_4 component and the amount of H_2 component. If this ratio is less than or equal to the first predetermined value, electric discharge will occur; if it exceeds the first predetermined value and is less than or equal to the second predetermined value, heating of only the insulating oil will occur; An abnormality monitoring device for oil-filled electrical equipment, characterized in that when a predetermined value is exceeded, it is determined that heating has occurred in insulating oil containing a solid insulator. 2. In claim 1, the solid insulator is provided with means for measuring the amount of CO component in the separated gas and means for determining the ratio between the amount of CO component and the amount of the CH_4 component. If it is determined that heating has occurred in the insulating oil containing
An abnormality monitoring device for oil-filled electrical equipment, characterized in that the heating temperature is determined based on this ratio. 3. Claim 1 provides means for separately measuring the amount of CO_2 component and CO component in the separated gas, and means for determining the ratio of the amount of CO_2 component and the amount of CO component. An abnormality monitoring device for oil-filled electrical equipment, characterized in that when it is determined that heating has occurred in insulating oil containing a solid insulator, the heating temperature is determined from this ratio. 4 In claim 1, means for separately measuring the amount of C_2H_4 component and C_2H_6 component in the separated gas, and means for measuring the amount of C_2H_4 component and C_2H_4 component,
_2H_6 component quantity ratio determining means; and when it is determined that heating occurs only in the insulating oil, the heating temperature is determined from this ratio. 5 In claim 1, means for separately measuring the amount of C_3H_6 component and C_3H_8 component in the separated gas, and means for measuring the amount of C_3H_6 component and C_3H_6 component,
_3H_8 An abnormality monitoring device for oil-filled electrical equipment, characterized in that the abnormality monitoring device is provided with means for determining the ratio of the amounts of the 8 components, and when it is determined that only the insulating oil has been heated, the heating temperature is determined from this ratio. 6 In claim 1, means for separately measuring the amount of C_2H_4 component and C_3H_8 component in the separated gas, and means for measuring the amount of C_2H_4 component and C_2H_4 component,
_3H_8 An abnormality monitoring device for oil-filled electrical equipment, characterized in that the abnormality monitoring device is provided with means for determining the ratio of the amounts of the 8 components, and when it is determined that only the insulating oil has been heated, the heating temperature is determined from this ratio. 7. The oil-immersed electrical appliance according to claim 1, characterized in that it is provided with means for displaying the determination results of the occurrence of electrical discharge, the occurrence of heating only in the insulating oil, and the occurrence of heating in the insulating oil containing a solid insulator. Equipment abnormality monitoring device.