JPH01227620A - Diagnosing method for transforming equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improving the accuracy of a method for diagnosing power substation equipment.

[Conventional technology]

Figure 4 relates to the conventional method for determining temperature dependence data (transformer oil level). The vertical axis shows the oil level height, and the horizontal axis shows temperature. ) is indicated by a frame. (2) is a value corresponding to temperature plotted from temperature and oil level.

In order to monitor oil leaks from transformers during patrol inspections at substations, patrol equipment reads and records the values of the oil level gauges and oil temperature needles attached to the transformers and takes them back, as shown in Figure 3. Indicated temperature -
Plot on the oil level characteristics to determine normality and abnormality.

For example, the temperature corresponding value (2) from the actual measurement value is 40°C.
The figure shows a case where the oil level height is 6 (read value of the indicator), and it can be seen that it is within the normal range (1).

[Problem to be solved by the invention]

Conventional diagnosis of substation equipment was configured as described above, so the data (oil level) had to be corrected on the graph by one temperature each time, and near the limits of the normal range, measurement errors and Judgment accuracy is reduced due to plotting errors, and when the temperature changes suddenly, it takes time for the oil temperature to become uniform, resulting in incorrect judgments because the oil level does not follow the change. There was an issue.

This invention was made to solve the above-mentioned problems, and improves the accuracy of judgment when it is at the limit of the normal range.
The object of the present invention is to obtain a method for diagnosing substation equipment that can prevent erroneous judgments even when the temperature suddenly changes.

[Failure to solve the problem]

The method for diagnosing substation equipment according to the present invention inputs data requiring temperature correction into a computer every time, so that the measured data corresponding to temperature can be viewed continuously over time, and at the same time, the normal range of temperature corresponding I made it possible to compare and display.

Furthermore, a sudden change in temperature is determined based on a preset level and displayed on a CRT or printer, and in the event of a sudden change, the determination is temporarily stopped and the determination is made after the temperature has stabilized. .

The method for diagnosing substation equipment in this invention continuously displays the measurement data that is input each time in response to temperature, and also displays the normal range in response to temperature at the same time. You can judge whether it is normal or not based on the relationship.

Also, if the oil temperature does not change (as a result of a sudden change in the load on the transformer, the winding temperature rises and the oil temperature suddenly rises), the oil temperature changes. Calculate the rate of change and determine in the calculator that it exceeds a preset value, display that fact, or pause the determination, and then if the rate of change becomes smaller, it will be displayed as normal or normal. Abnormalities are determined in a computer and displayed on a CRT or printer.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings. In Figure 1, (3) is a calculator, (4) is an input device, and C
5) is a CRT, (6) is a printer, and (7) is a connecting cable, which constitutes a diagnostic device (8) for substation equipment. Second
The figure is a display example of 0RT (5) or printer (6), in which (9) is the upper limit of the normal range, αd is the lower limit of the normal range, and 0]) is the actual measurement result. The mouth also indicates that the temperature has changed beyond a predetermined level. FIGS. 3(a) to 3(0) show flowcharts of the present invention.

Next, the effect will be explained. In Figures 1 to 3,
During a patrol inspection of a substation, for items that require temperature correction,
For example, in the case of a transformer, the oil temperature and oil level height are read with respective indicators and each time inputted into the calculator (3) through the input device (4) of the diagnostic device (8) (step S1). ) ・In the computer (3), according to the preset program, 0RT (5) or printer (6)
Σ, which displays the oil level height (2) in response to time as shown in Figure 2. At the same time, the normal range of oil level height shown in FIG.
2), normal range (between upper limit (9) and lower limit aG in Figure 2)
is displayed (step S3). By displaying it in this way, it is possible to determine whether the actual measurement data is normal or abnormal by making it □ that t-.

Next, the oil temperature display will explain an example where the load on the transformer suddenly increases and the winding temperature rises, causing the oil temperature to rise rapidly but not uniformly. It no longer represents the oil temperature. For example, if the measurement point is close to the winding, the temperature will be displayed as high, so if you read the normal range at this temperature, it will be high, but since the actual oil level is low, there will be a difference in temperature. falls below the lower limit of the normal range, but if the temperature change (time characteristic) exceeds a certain value (the oil temperature does not follow the temperature change), let the computer decide,
To that effect, the sudden change region (2) can be displayed as shown in FIG. 2 to draw attention when making a judgment.

The processing flow within the computer in this case is shown in FIG. 3('b). Unlike (,), the temperature change* is calculated within the computer (S3)
It is determined whether the temperature change rate is within a certain level (S4), and graph display processing is performed accordingly (5s-1, 85-2).

In the above example, when the temperature changes rapidly, it is compared to a preset value and displayed if it exceeds it, but the computer determines when the temperature has stabilized, and after the temperature has stabilized,
It is also possible to automatically determine whether it is normal or abnormal, and the difference in computer processing from the previous example is shown in FIG. 3 (0). After determining whether the temperature change rate is within a certain value (S4), if the change rate is within a certain value, it is possible to determine whether it is normal or abnormal. After determining whether it is normal or abnormal (SS), the judgment result and data are displayed in a graph. (S6-1). If the temperature change rate is not within a certain value, the data is displayed in a graph (36-2).

〔Effect of the invention〕

As described above, this invention applies a computer to the diagnosis of substation equipment and shows the normal range in response to temperature by comparing it with measured data, so it is possible to improve the accuracy of judgment, and If the data does not follow the temperature, a preset value can be displayed to remind you to make a judgment, and it can also automatically determine whether the data is normal or abnormal by automatically determining that the temperature has stabilized. can be done automatically0

[Brief explanation of the drawing]

FIG. 1 is a simplified diagram showing a diagnosis device for substation equipment according to an embodiment of the present invention, and FIG.
FIG. 3 is an explanatory diagram showing a display example of an RT or printer, FIG. 3 is a flowchart showing processing of measurement data, and FIG. 4 is an explanatory diagram of a conventional one. Note that the same reference numerals in the figures indicate the same or equivalent parts. To Kari h Deaf children 9ya 2 7□

Claims (1)

[Claims] (1) In order to exclude the influence of temperature changes when determining temperature-dependent characteristics among the characteristics of substation equipment, the temperature at the time of determination is The normal range for the data was determined, and the normal range and the size of the data were plotted on the vertical axis on the output paper of the CRT or printer, and the measurement date (hour) was plotted on the horizontal axis to show the respective changes over time. A method for diagnosing substation equipment characterized by the following.