JPS5858802B2 - Continuous monitoring device for dissolved gas in oil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous monitoring device for gas dissolved in oil for continuously monitoring gas generated due to internal abnormal phenomena in oil-immersed transformers and detecting internal abnormal phenomena at an early stage. be.

Conventionally, in transformers that have a space above the oil level inside the transformer, such as nitrogen-filled transformers and open type transformers, the space above the oil level has been A combustible gas detector is used to intermittently measure combustible gas.

However, some of the recent transformers do not have a space above the oil surface inside the transformer, such as those equipped with a diaphragm type conservator, and the above-mentioned device cannot be applied to such transformers.

Furthermore, even if the transformer has a space above the oil level, it is difficult to continuously feed the gas in the space to the measuring device, so gas must be fed to the measuring device intermittently. do not have.

This invention was made in view of the above points, and is a system that continuously detects gas dissolved in oil regardless of the oil deterioration prevention method of transformers such as nitrogen-filled transformers and diaphragm transformers. The purpose of the present invention is to provide a device that continuously monitors abnormalities inside a transformer.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a continuous monitoring device according to the present invention, in which a transformer main body 2 consisting of windings, iron cores, etc. is installed in a transformer tank 1. The above transformer tank 1
A conservator 3 for preventing oil deterioration is provided on the upper surface of the transformer tank 1, and a radiator 4 for oil cooling is provided on the side of the transformer tank 1, communicating the upper and lower parts of the tank.

Reference numeral 5 denotes an insulating oil circulation passage provided in the side wall of the transformer tank 1 so as to communicate between the upper and lower parts thereof, and a sealed gas detection chamber 6 is inserted approximately in the middle of this insulating oil circulation passage 5. An oil feed pump 7 is provided at the outlet of the gas detection chamber 6 that communicates with the lower side of the transformer tank 1, and the oil level in the gas detection chamber 6 is raised by the operation of the oil feed pump 7 to feed oil to the lower side of the tank. A gas space 8 is created.

Further, an oil level detector 9 for detecting the oil level in the gas detection chamber 6 is provided on the outer surface of the gas detection chamber 6, and a gas detector 10 is further installed in the gas detection chamber 6. The gas sensor 11 is hermetically inserted into the gas space 8 of the gas detection chamber 6.

Therefore, if the oil feed pump 7 is driven to circulate the insulating oil 12 in the transformer tank 1 through the insulating oil circulation passage 6 and the gas detection chamber 6, the oil level in the gas detection chamber 6 will drop and the gas space 8 will be lowered. At the same time, the oil level is detected by the oil level detector 9, and the outflow amount of the oil feed pump 7 is controlled so that the oil level in the gas detection chamber 6 remains constant. .

That is, by adjusting the outflow amount of the oil feed pump 7, the oil level in the gas detection chamber can be kept constant.

By continuing this operation, the dissolved gas in the oil is released into the gas space 8, and the concentration of the dissolved gas in the oil and the gas space 8 are increased.
The gas concentration within reaches equilibrium.

The gas in the gas space 8 thus obtained is continuously detected by the gas detector 10.

FIG. 2 shows another embodiment of the present invention for creating a gas space 8 in the gas detection chamber 6, in which a button is pressed on a monitoring device configured in the same manner as in FIG. A throttle valve 13 is provided at the oil inlet of the gas detection chamber 6, which communicates with the oil level detector 9. If the oil level in the gas detection chamber 6 is maintained at a constant level by detecting the oil level in the gas detection chamber 6 and adjusting the discharge flow rate of the oil feed pump 1 on the outlet side, it is the same as the embodiment shown in Fig. 1 above. Can continuously detect dissolved gases in oil.

In addition, in FIG. 3, another oil feed pump 14 is provided at the oil inlet of the gas detection chamber 6 that communicates with the upper part of the transformer tank 1, and the discharge flow rate of this oil feed pump 14 and the outlet side oil feed pump 7 is adjusted. This shows still another embodiment of the present invention in which the oil level in the gas detection chamber 6 is kept constant to create a gas space 8, and dissolved gas in the oil is released into the gas space 8. It is something.

FIG. 4 shows still another embodiment of the present invention, in which an oil feed pump 7 is provided on the bottom outlet side of a gas detection chamber 6 that communicates with the lower part of the transformer tank 1 via a passage 5. The gas space 8 of the gas detection chamber 6 is connected to the upper part of the transformer tank 1 via an insulating oil circulation passage 5, and a nozzle 15 protruding into the gas space 8 is provided at the inlet of this connection.
is driven with the discharge flow rate adjusted so that the oil level in the gas detection chamber 6 is constant, thereby creating a gas space 8. At the same time, oil is ejected from the nozzle 15 to remove dissolved gas in the oil. It is released into the gas space 8 and allows continuous detection of the dissolved gas.

Since this embodiment uses a nozzle 15 to eject oil into the gas detection chamber 6, the concentration of dissolved gas in the oil and the gas concentration between the gas spaces 8 are as shown in FIGS. 1 to 3 above. Equilibrium is reached in a shorter time than in the embodiment, and changes in the concentration of dissolved gas in oil can be detected in a shorter time, thus making it possible to detect abnormalities inside the transformer more quickly.

As described above, according to the device of the present invention, an insulating oil passage is provided outside the transformer tank to forcefully circulate the oil, and the insulating oil is placed on the oil surface in the gas detection chamber provided in the oil passage. Create a gas space by adjusting the flow rate9. Since the gas dissolved in the oil is allowed to accumulate in this gas space, it is possible to continuously detect the dissolved gas in the oil, and
Changes in the concentration of gas dissolved in oil can be continuously and reliably monitored for all types of transformers, and there is an effect that abnormal phenomena inside the transformer can be detected at an early stage.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the device of this invention, FIGS. 2 and 3 are sectional views of essential parts showing other embodiments of the device of this invention, and FIG. 4 is a sectional view of still another embodiment of the device of this invention. It is a sectional view showing an example. 1...Transformer tank, 2...Transformer body, 5...Insulating oil circulation passage, 6...Gas detection chamber, 7...・・Oil pump, 8・・・・・・
Gas space, 1o... curved gas detector, 12... insulating oil, 13... throttle valve, 14... curved oil feed pump, 5... nozzle.

Claims (1)

[Scope of Claims] 1. An insulating oil circulation passage whose both ends communicate with the tank of the oil-immersed transformer and which is provided outside the bracket tank and through which the insulating oil in the tank always flows, and an insulating oil circulation passage provided in the middle of this circulation passage. a gas detection chamber, a means for adjusting the amount of insulating oil flowing through the circulation passage to create a constant gas space above the oil level in the gas detection chamber, and a gas sensor for detecting gas concentration in the gas space. A continuous monitoring device for gas dissolved in oil, characterized in that it is equipped with a gas detector in which a gas detector is airtightly inserted. 2. Gas dissolved in oil according to claim 1, wherein the means for creating a gas space comprises a throttle provided at the inlet of the gas detection chamber and an oil pump provided at the outlet. Continuous monitoring device. 3. The continuous monitoring device for gas dissolved in oil as set forth in claim 1, wherein the means for creating the gas space comprises an oil feed pump provided at the inlet and outlet of the gas detection chamber, respectively. 4. Claims characterized in that the means for creating the gas space comprises an oil pump provided at the outlet of the gas detection chamber, and a nozzle provided at the inlet for spouting insulating oil into the gas detection chamber. 2. The continuous monitoring device for dissolved gas in oil according to item 1.