JPH0152704B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that continuously monitors abnormalities in oil-filled electric power equipment such as transformers and reactors that use insulating oil, and in particular, the present invention relates to a device that continuously monitors abnormalities in oil-filled electric power equipment such as transformers and reactors that use insulating oil. The present invention relates to an abnormality monitoring device for oil-filled electrical equipment, which is characterized by being able to automatically perform extraction and gas analysis.

One example of a method for monitoring abnormalities in oil-filled electrical equipment, such as transformers, is to collect a sample of insulating oil from a transformer, take it to a laboratory or testing room, and extract the dissolved gas from this insulating oil to make glass. The gas is collected in a gas sample tube and analyzed by a gas analyzer to detect the type and amount of dissolved gas in the insulating oil. Based on the analysis results, it is possible to determine whether or not there is an abnormality in the oil-filled electrical equipment. Various methods are being used to determine this. However, this method has the disadvantage that there is a considerable time delay after the initial failure occurs until it is determined whether or not there is an abnormality in the oil-filled electrical equipment.

On the other hand, when discussing the case of extracting dissolved gas from insulating oil, gas extraction devices for dissolved gas in insulating oil generally include a gas extraction device using a Trithier vacuum, a gas extraction device using a combination of a mercury diffusion pump and a Teppler pump, and a vacuum pump. There are gas extraction devices that use moving valves, etc., but the gas extraction device using the Trithierly vacuum described above uses a glass leveling bottle containing mercury to create a so-called Trithierly vacuum, and the gas is submerged in insulating oil in a vacuumed glass container. This method uses mercury and a glass container, so there are drawbacks such as the risk of mercury vapor escaping and the glass container being damaged. In addition, a gas extraction device that uses a combination of a mercury diffusion pump and a Teppler pump uses an oil rotary pump, a mercury diffusion pump, and a Teppler pump to maintain a glass deaeration container in a vacuum state and inject insulating oil into the deaeration container. Although this is a method of releasing dissolved gas and accumulating it in a gas storage container, there is a risk of mercury vapor escaping and breakage of the glass container, similar to the aforementioned Trithierly vacuum. Furthermore, a gas extraction device using a vacuum pump and a moving valve uses a vacuum pump to keep the inside of the cylinder in a vacuum state, releases dissolved gas into the cylinder, and operates the moving valve when the degassing from the insulating oil is completed. This method involves charging the extracted dissolved gas into a gas sample tube, but since the dissolved gas extraction operation can only be performed once for the same sample, highly soluble dissolved gases cannot be extracted sufficiently. There are drawbacks such as difficulty in measuring the amount. In addition to these devices, there is also a gas extraction device that uses a carrier gas replacement method to extract the dissolved gas by replacing it with the dissolved gas in the insulating oil using a carrier gas, but in this case, it is difficult to measure when the concentration of dissolved gas is low. However, since the amount of insulating oil used as a sample is small, errors tend to occur in the measured values.

In view of these points, the present invention eliminates the need to use a glass device that is at risk of breakage, eliminates the risk of mercury vapor escaping, and efficiently uses highly soluble dissolved gas. The object of the present invention is to provide an abnormality monitoring device for oil-filled electrical equipment that can automatically analyze dissolved gas by extracting dissolved gas using a gas extraction device that can sufficiently deaerate the gas and transferring it to a gas analyzer. do.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of an abnormality monitoring device for oil-filled electrical equipment according to the present invention, and FIG. 2 is a circuit diagram of the abnormality monitoring device in the same embodiment.

In FIG. 1, reference numeral 1 denotes the main body of an oil-filled electrical device that houses the contents of the electrical device and insulating oil, and 2
3 is a cooling device connected to the main body 1, and 3 is an abnormality monitoring device provided in the middle of the oil guide pipe between the main body 1 and the cooling device 2. This abnormality monitoring device will be explained with reference to FIG.

In FIG. 2, reference numeral 4 is an oil storage tank, 5 is a degassing tank, 6 is a reciprocating piston device for extracting gas, and 21 is a gas analyzer.

Conduits 9 and 10 are disposed in the middle of the oil guide pipe 8 between the main body 1 and the cooling device 2, and valves 11 and 1 are provided, respectively.
It is communicated with the oil storage tank 4 via 2. This oil storage tank 4
is communicated with the degassing tank 5 via the valve 13 and further connected to the valve 1.
4 to the cylinder chamber 6a of the reciprocating piston device 6. A vacuum pump 16 is connected to the cylinder chamber 6a via a valve 7 and a three-way valve 15.
is connected. On the other hand, the three-way valve 15 includes a pressure sensor 23, valves 28a and 28b, and conduits 17a and 17.
b and one or more (two in the figure) sample tubes 19a,
19b is connected. This switching valve 18a, 1
When the switching valve 8b is rotated by a predetermined angle, the switching valve 18a,
The dissolved gas in the gas sample tubes 19a, 19b is supplied to the gas analyzer 21 via the switching valves 18a, 18b and further via the conduits 20a, 20b by the carrier gas from the supply tube 22 connected to the gas sample tube 18b. It's becoming like that. Note that the pressure sensor 23 is connected to the gas sample tube 1 through the conduits 7a and 17b.
It has a function of measuring the amount of dissolved gas supplied to 9a and 19b.

On the other hand, the reciprocating piston device 6 is driven by a differential piston device 24. That is,
A large diameter piston 26 of a differential piston device 24 is connected to the piston 6b of the reciprocating piston device 6 via a piston rod 25. A vacuum pump 16 is connected to the cylinder chamber 24a on the piston 6b side of the large diameter piston 26 via a switching valve 27.
Also, the cylinder chamber 26 on the other side of the large diameter piston 26
b is also connected to the vacuum pump 16 via the switching valve 28. Therefore, by switching the switching valve 28 to connect the cylinder chamber 26b to the vacuum pump 16, and opening the other cylinder chamber 24a to the atmosphere using the switching valve 27, the large diameter piston 26 is moved by the differential pressure on both sides thereof. The piston 6b then moves to the right in the figure, and the piston 6b retreats accordingly. On the other hand, the cylinder chamber 24a is connected to the vacuum pump 1 via the switching valve 27.
6 and open the cylinder chamber 26b to the atmosphere via the switching valve 28, the large diameter piston 26
At the same time, the piston 6b moves to the left, making it possible to transfer and charge the above-mentioned dissolved gas to the gas sample tubes 19a and 19b.

However, in order to extract the dissolved gas in the insulating oil using the above device, the piston 6b of the reciprocating piston device 6 is moved to the right in the figure by the differential pressure piston device 24, and the volume of the cylinder chamber 6a is reduced. Make it wider. Therefore, by opening the valves 7 and 14 and operating the three-way switching valve 15 to connect the cylinder chamber 6a and the gas sample tubes 19a and 19b to the vacuum pump 16, and operating the vacuum pump 16,
Cylinder chamber 6a, degassing tank 5, and gas sample tube 1
The interiors of 9a, 19b, etc. are brought into a predetermined vacuum state.
When the inside of the cylinder chamber 6a etc. reaches a predetermined vacuum state in this way, the three-way switching valve 15 is switched to cut off the communication between the cylinder chamber 6a, gas sample tubes 19a, 19b, etc. and the vacuum pump 16, and the switching valve 13 is opened to separate and release the dissolved gas from the insulating oil in the oil storage tank 4, allowing it to flow into the cylinder chamber 6a maintained in a vacuum state, and the gas sample tubes 19a, 1
Accumulate in 9b. Therefore, while closing the valve 13 and maintaining the three-way switching valve 15 in a state where the cylinder chamber 6a and the gas sample tubes 19a, 19b communicate with each other, the differential pressure piston device 24 is operated to remove the piston 6b of the reciprocating piston device 6. move it to the left. Therefore, by the movement of the piston 6b, the dissolved gas in the cylinder chamber 6a is forcibly transferred and charged into the gas sample tubes 19a and 19b.

When the transfer and charging into the gas sample tubes 19a and 19b is completed as described above, at that point the valve 7 is closed and the piston 6b of the reciprocating piston device 6 is moved to the right again. As the inside of the cylinder chamber 6a is again brought to a high degree of vacuum, the dissolved gas in the insulating oil in the deaeration tank 5 is released from the insulating oil and accumulated in the cylinder chamber 6a by opening the valve 14. be done.
The accumulated dissolved gas is sequentially transferred and charged into the gas sample tubes 19a and 19b by repeating the above-described operation. In this way, by repeatedly performing the degassing and extraction operation for dissolved gases on the same sample of insulating oil, dissolved gases that have high solubility and are difficult to degas can also be efficiently extracted.

The amount of dissolved gas extracted is measured by a pressure sensor 23 that has been calibrated in advance. On the other hand, the dissolved gas transferred to the gas sample tubes 19a, 19b is transferred to the gas sample tubes 19a, 19b by switching the switching valves 18a, 18b and supplying the carrier gas from the carrier gas supply tube 22 to the gas sample tubes 19a, 19b.
8a, 18b and conduits 20a, 20b to a gas analyzer 21, where hydrogen or combustible gas in the dissolved gas is analyzed. Therefore, by monitoring this analysis result, it is possible to continuously monitor abnormalities in oil-filled electrical equipment.

In addition, as shown in FIG. 3, the gas analyzer 21
If the alarm display device 29 is installed in the gas analyzer 21, the alarm display device 29 will immediately issue an alarm when hydrogen or combustible gas in the dissolved gas sent to and analyzed by the gas analyzer 21 exceeds a specified concentration. can be displayed.

Since the present invention is configured as described above, dissolved gas can be repeatedly extracted from insulating oil by reciprocating the piston of the reciprocating piston device. Further, even dissolved gases with high solubility can be sufficiently extracted, and the entire apparatus is extremely small and lightweight. On the other hand, since mercury is not used to extract dissolved gas, there is no risk of mercury vapor escaping. Furthermore, since the piston of the reciprocating piston device is caused to reciprocate by the pressure difference between the vacuum and atmospheric pressure, it is necessary to provide a mechanical drive device or a special pressurizing device to drive the reciprocating piston device. Without,
It has the advantage that the vacuum pump used to create a vacuum inside the degassing container can also be used as its driving source, and the gas generated in the insulating oil is continuously separated and extracted, so abnormalities can be quickly detected. It is possible to understand and monitor the situation.

Furthermore, the solenoid valve type, the opening/closing operation of the solenoid valve, and the operation of the vacuum pump can be automatically controlled at the timing and order of operation by a combination of relays and timers, so the equipment maintenance manager can simply issue a command to start operation. It is possible to provide an abnormality monitoring device for oil-filled electrical equipment that can automatically perform everything from gas extraction to analysis on the spot and can quickly and reliably monitor equipment for abnormalities.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the abnormality monitoring device for oil-filled electrical equipment of the present invention, FIG. 2 is a circuit diagram showing details of the abnormality monitoring device in the embodiment of FIG. 1, and FIG. FIG. 3 is a circuit diagram showing another embodiment of the invention. 1... Electric equipment body, 2... Cooling device, 3... Abnormality monitoring device, 4... Oil storage tank, 5... Deaeration tank, 6... Reciprocating piston device, 16... Vacuum pump, 18... Switching valve, 19... Gas sample Pipe, 21... Gas analyzer, 2
3...Pressure sensor, 24...Differential piston device, 29
...Alarm display device.

Claims (1)

[Scope of Claims] 1. A device for monitoring abnormalities in oil-filled electrical equipment, which includes an oil tank connected to the main body of the electrical equipment that stores the contents of the electrical equipment and insulating oil, and an insulating oil tank that stores the contents of the electrical equipment and insulating oil. A degassing tank for degassing dissolved gas from oil, a reciprocating piston device for extracting dissolved gas from the degassing tank and transferring the dissolved gas to a gas sample tube, and a combination of vacuum and atmospheric pressure. A differential pressure piston device that reciprocates based on differential pressure and drives the reciprocating piston device, and a gas pipe connected to the degassing tank, the cylinder chamber of the reciprocating piston device, and the gas sample tube via a switching valve. An oil container characterized by comprising a vacuum pump that brings the degassing tank and cylinder chamber to a predetermined vacuum state before the start of the extraction operation, and a gas analyzer that analyzes the dissolved gas transferred and charged into the gas sample tube. Abnormality monitoring device for electrical equipment. 2. A device that monitors abnormalities in oil-filled electrical equipment includes an oil tank connected to the main body of the electrical equipment that stores the contents of the electrical equipment and insulating oil, and removes dissolved gas from the insulating oil accumulated in this oil tank. A degassing tank for removing gas, a reciprocating piston device that extracts dissolved gas from the degassing tank and transfers the dissolved gas to a gas sample tube, and a vacuum pump to generate a differential pressure between the vacuum and atmospheric pressure. Therefore, the differential pressure piston device that reciprocates and drives the reciprocating piston device is connected to the degassing tank, the cylinder chamber of the reciprocating piston device, and the gas sample tube via a switching valve, and the gas extraction operation is started. A vacuum pump that brings the degassing tank and cylinder chamber to a predetermined vacuum state, a gas analyzer that analyzes the dissolved gas transferred into the gas sample tube, and an alarm display based on the command from the gas analyzer. 1. An abnormality monitoring device for oil-filled electrical equipment, characterized in that it comprises an alarm display device that can perform