JPH0687448B2 - Abnormality diagnosis device for oil-filled electrical equipment - Google Patents

Description

The present invention relates to an abnormality diagnosis device for oil-filled electrical equipment.

[Conventional technology]

Conventionally, an abnormality diagnosis device for oil-filled electrical equipment detects the concentration of each gas component in oil or the amount of increase in each gas, and detects the oil-filled transformer, oil-filled reactor, and other oil-filled electrical equipment such as oil-filled electrical equipment. The presence or absence of abnormalities was judged and the type of abnormality was judged from the ratio of individual gas components. Electric Cooperative Research Vol. 36, No. 1
As shown in Fig. 5 in JP, partial discharge, arcing the value of _{C 2 H 2 / C 2 H} 4, a determination is overheated, C ₂ H ₄ / C
_Although a method of determining the superheat temperature category (high temperature, medium temperature, low temperature) by ₂ H ₆ and a method of using a gas pattern (not shown) have been proposed, the location of the superheated portion and the estimation of the superheated area are considered. Not not.

In Japanese Patent Laid-Open No. 57-1203, as shown in FIG. 6, classification of abnormalities (overheat including insulation, overheat of oil only, discharge) is performed according to the value of CH ₄ / H ₂ , and As shown in Fig. 7, the superheat temperature when only oil was overheated due to the component ratio of various gases, and as shown in Fig. 8 and Fig. 9, respectively, CO / CH ₄ The value of CO ₂ / CO ₂ is used to determine the overheating temperature when the insulator is overheated in oil. In this case, the superheat temperature can be estimated by the component display device and the computer processing device, but there are three types of superheat temperatures, and it is difficult to select which one is correct. He didn't care.

In JP-A-58-18909, the presence or absence of an abnormality is determined by the amount of each gas component, and the type (pattern) of the abnormality is determined by the amount of CO, CH ₄ / C ₂ H ₂ value and CH ₄ / H ₂ value. However, when it is determined that the temperature is overheating, the overheating temperature is calculated from the CO / CH ₄ value or the C ₂ H ₄ / C ₂ H ₆ value. However, no consideration was given to the location of the overheated part and the estimation of the overheated area.

[Problems to be solved by the invention]

The above-mentioned conventional technique estimates the presence / absence of abnormality, the type (pattern) of abnormality, and the overheating temperature, and cannot accurately diagnose the abnormality, which is insufficient as the abnormality diagnosis of the oil-filled electrical equipment.

The present invention has been made in view of the above points, and an object of the present invention is to provide an abnormality diagnosis device for an oil-filled electrical device that enables accurate abnormality diagnosis.

[Means for solving problems]

The purpose of the above is to install the device on the side wall of the tank and to extract the gas in the oil from the insulating oil, the gas detector connected to this gas extractor to detect each gas component, and the high voltage winding. Connected to the high-voltage lead of the unit and connected to the current detection sensor that detects the load current, the gas detector and the current detection sensor, and the abnormal pattern determination unit that determines the abnormal pattern, and locates the overheat position when the abnormal pattern is overheated. And an abnormality diagnosis section having an overheat area estimating means for estimating the overheat area.

[Action]

The abnormality diagnosing device includes a gas extractor, a gas detector, a current detection sensor, an abnormality pattern determining means, an overheat position locating means,
Since it is formed by the abnormality diagnosing unit having the overheat area estimating means, the abnormality pattern and the overheat position can be determined and located, and the overheat area can be estimated, so that the abnormality can be diagnosed more accurately than before.

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 shows an embodiment of the present invention. As shown in the figure, the contents of a transformer in which a high voltage winding 2 and a low voltage winding 3 are wound around an iron core 1 are stored in a transformer tank 5 together with insulating oil 4. The terminal of the high-voltage winding 2 is drawn out of the transformer tank 5 via the high-voltage lead 6 and the high-voltage bushing 7. Similarly, the terminal of the low-voltage winding 3 is also pulled out via the low-voltage lead 8 and the low-voltage bushing 9. Have been pulled out. Of the gas in the oil extracted from the insulating oil 4 of the oil-filled transformer thus configured, H ₂ , CH ₄ , C ₂ H ₂ , C ₂ H ₄ , C ₂ H
An abnormality diagnosis device for diagnosing abnormality of the oil-filled transformer based on the amount of each gas component of ₆ , CO ₂ and CO is provided on the side wall of the transformer tank 5 to extract gas in oil from the insulating oil 4. Bowl 10
A gas detector 11 connected to the gas extractor 10 for detecting each gas component, and a current detection sensor 12 connected to the high voltage lead 6 of the high voltage winding 2 for detecting a load current (load amount).
Connected to the gas detector 11 and the current detection sensor 12,
The abnormality diagnosing unit 13 has an abnormal pattern determination means for determining an abnormal pattern, an overheat position locating means for locating an overheat position when the abnormal pattern is overheat, and an overheat area estimating means for estimating an overheat area. By doing this, it becomes possible to accurately diagnose the oil-filled transformer.
It is possible to obtain an abnormality diagnosis device for oil-filled electrical equipment that enables accurate abnormality diagnosis.

That is, although the gas extractor 10 is provided, for example, a gas separator composed of a gas separation membrane and a gas reservoir is used. Further, the gas detector 11 is provided, which uses a gas chromatograph or various gas sensors. The current detection sensor 12 attached to the high-voltage bushing 7 was connected to the detection box 14 provided on the side wall of the transformer tank 5, and was then connected to the abnormality diagnosis unit 13. By doing so, the abnormality of the oil-filled transformer can be accurately diagnosed, which will be described with reference to the flow chart of FIG.

The total amount combustible gas (TCG) is calculated by the _{TCG = H 2 + CO + CH} 4 + C 2 H 4 + C 2 H 6 + C 2 H 2 by each gas component amount detected by the gas detector,
Further, the TCG increase amount is calculated at regular intervals, and the presence or absence of abnormality is determined by comparison with the reference value. In other words, when the value is below the standard value (eg 700ppm), it is displayed as normal, and when it is above the standard value, the type of abnormality (pattern) depends on the values of C ₂ H ₄ / C ₂ H ₆ and C ₂ H ₂ / C ₂ H _4. That is, it is determined to be partial discharge, arc discharge, or overheat (abnormal pattern determination means of the abnormality diagnosis unit). If the abnormal pattern determination means determines that the overheat is detected, the position of the overheated portion (overheat position determination means) is performed.

First, when the CO amount is equal to or higher than the reference value (for example, 300 ppm), the coil (high / low voltage winding) or the lead (high / low voltage lead) is heated to the reference value or less, and the iron core is overheated and positioned.
If the amount of C ₂ H ₂ exceeds the standard value (eg 50ppm), the coil or lead is overheated. If the amount is less than the standard value, the bare metal in the transformer tank is overheated and the position is localized.

Further, if the load amount taken in from the current detection sensor is a reference value (for example, a load factor of 70%) or more, the coil or lead is overheated, and if it is less than the reference value, the iron core is overheated and the position is localized.

The overheated area of the iron core or the bare metal is subjected to the overheated area estimation (overheated area estimation means).

The CO ₂ / CH ₄ gas was detected to calculate, CO ₂ from the value on the vertical axis
The production ratio of / CH ₄ is taken, and the abscissa shows the superheat temperature to produce CO ₂ / CH ₄
The superheat temperature is obtained from FIG. 3, which shows the relationship between the generation ratio of the superheater and the superheat temperature. Next, the increase amount of gas in oil is calculated, the superheated area is taken as a parameter with the superheat temperature as a parameter, and the increase amount of gas in oil is taken as a horizontal axis to show the relationship between the increased amount of gas in oil and the overheated area. Calculate the overheated area from the figure.

In this way, the presence / absence of abnormality, the type of abnormality, the location of the overheated portion, and the estimation of the overheated area can be performed. As described above, according to the present embodiment, it is possible to locate the overheated portion and estimate the overheated area for the presence or absence of abnormality by the conventional gas pattern or the component ratio, the determination of the type of abnormality and the diagnosis by the estimation of the overheat temperature. The diagnostic accuracy of oil-filled electrical equipment can be improved. Therefore, it is possible to save labor and unmanned maintenance and management by automatic abnormality diagnosis.

The reference value of the gas component in oil used for the abnormality determination is not absolute and can be set arbitrarily.

Further, the abnormality processing device having an arithmetic processing unit such as a microcomputer and an abnormality display device may be an online constant monitoring device, or may be a portable type.

〔The invention's effect〕

As described above, according to the present invention, an accurate abnormality diagnosis can be performed, and an abnormality diagnosis device for an oil-filled electrical device that enables accurate abnormality diagnosis can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the overall configuration of an embodiment of an abnormality diagnosing device for oil-filled electrical equipment of the present invention, FIG. 2 is a flow chart of the abnormality diagnosing device of FIG. 1, and FIG. Example CO
FIG. 5 is a characteristic diagram showing the relationship between ₂ / CH ₄ and the superheat temperature, and FIG. 4 is a characteristic diagram showing the relationship between the amount of increase in gas in oil and the superheated area with the superheat temperature of one embodiment as a parameter. An abnormality diagnosis diagram of a conventional abnormality diagnosis apparatus for oil-filled electrical equipment, FIG. 6 is a determination chart of the same type of conventional abnormality, and FIGS. 7 to 9 are also conventional conventional gas component ratios and superheat temperatures. It is a characteristic view which shows a relationship. 1 ... Iron core, 2 ... High voltage winding, 3 ... Low voltage winding, 4 ... Insulating oil,
5 ... Transformer tank, 6 ... High voltage lead, 8 ... Low voltage lead,
10 ... Gas extractor, 11 ... Gas detector, 12 ... Current detection sensor, 13 ... Abnormality diagnosis section.

Claims (5)

[Claims] 1. A gas in oil extracted from the insulating oil of an oil-filled electrical device in which high and low voltage windings and an iron core are housed together with insulating oil in a transformer tank, H ₂ , CH ₄ , C ₂ H ₂ , C. in the abnormality diagnosis device for an oil-filled electrical apparatus for diagnosing an abnormality of the oil-filled electrical apparatus based on _{2 H 4, C 2 H 6} , CO 2, gaseous components of CO, and the device is provided on a side wall of said tank A gas extractor for extracting gas in oil from the insulating oil, a gas detector connected to the gas extractor for detecting the gas component, and a high voltage lead of the high voltage winding, and a load current A current detection sensor for detecting, and an abnormal pattern determination means connected to the gas detector and the current detection sensor to determine an abnormal pattern,
An abnormality diagnosing device for an oil-filled electric machine, which is formed by an abnormality diagnosing section having an overheat position locating means for locating an overheat position when the abnormality pattern is overheat and an overheat area estimating means for estimating an overheat area. . 2. The gas H ₂ , CH ₄ , C ₂ H ₂ , C ₂ H ₄ , C ₂ H ₆ , CO ₂ , CO detected by the gas detector by the abnormal pattern judging means.
Is calculated and the amount of increase of the total amount at regular intervals is calculated. If the total amount is less than or equal to the reference value, it is normal, and if the total amount is greater than or equal to the reference value, C ₂ H ₄ / C ₂ H ₆ , C ₂ H Claim 2 Claims for calculating ₂ / C ₂ H ₄ and determining abnormal patterns of partial discharge, arc discharge and overheating from the calculated values.
Abnormality diagnosis device for oil-filled electrical equipment according to the item. 3. The overheat position locating means compares the CO amount and C ₂ H ₂ amount of the detected gas with a reference value thereof, and when the amount is less than the reference value, the overheat position is set in the iron core or the transformer tank. 2. The method according to claim 1, wherein the location of the bare metal is determined, and when the temperature is higher than a reference value, the overheated position is determined to be the high and low voltage windings or the high and low voltage windings. Abnormality diagnosis device for oil-filled electrical equipment. 4. The overheat position locating means compares the load current detected by the current detection sensor with a reference value thereof, and when the load current is below the reference value, the overheat position is set to the iron core, and when it is above the reference value, the overheat position is set. Said high, low voltage winding or high, low voltage winding height,
The abnormality diagnosis apparatus for an oil-filled electrical device according to claim 1, which is designed to be a low voltage lead. 5. The superheat area estimation means calculates CO ₂ / CH ₄ of the detected gas when the superheat position is located at the iron core and the bare metal, and the superheat temperature is calculated from this calculated value. However, the abnormality of the oil-filled electrical device according to claim 1 or 3 or 4, wherein the overheated area is estimated from the calculated overheat temperature and the increased amount of gas in oil. Diagnostic device.