JPS6145787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormality detection device for electrical equipment, which detects, for example, abnormal discharge occurring in SF ₆ gas equipment.

Below, we will explain an example of use in a GIS (SF ₆ gas insulated substation) where there are many SF ₆ gas classifications.

By storing a detection substance that changes color upon contact with SF ₆ decomposition gas in a mechacructor, it is possible to measure many gas categories in a short period of time.

Conventional detection devices can be roughly divided into two methods: a method in which the detection section is placed inside the device (a closed container), and a method in which the detection section is placed outside.

Methods for arranging the detection part inside include a chemical method that uses a see-through window to detect the color change of a detection substance that reacts with the SF ₆ decomposition gas generated by partial discharge;
There are mechanical methods that detect vibrations and accelerations associated with partial discharges, and methods that detect light associated with partial discharges.

All of these methods are capable of highly sensitive detection, but because the detection section is located inside the device, the device must be stopped when replacing the sensing element.

The method of locating the detection section externally allows it to be replaced whenever necessary, regardless of the operation of the device. This method includes a chemical method in which a detection substance that changes color when reacting with SF ₆ decomposed gas is placed in a transparent tube, and the sample SF ₆ gas is passed through contact with the detection substance, and a stethoscope is applied to the outside of the sealed container. There are methods of detecting the presence of internally generated sounds.

The former, which is a chemical method, requires a dedicated outlet for taking out the sample SF ₆ gas, while the latter requires a person to measure while moving, so each measurement takes time, so a large number of gas categories can be tested. There was a problem with (measuring).

This invention was made in view of the above points, and aims to provide a device that can easily detect internal abnormalities in a short time in, for example, a GIS (gas insulated substation) that uses many SF ₆ gas classifications. The purpose is

The present invention will be described above based on the drawings.

FIG. 1 is a schematic configuration diagram of a detection device when applied to a gas-insulated substation. In the figure, 1 is a disconnector 2 is a disconnector, 3 is a grounding device, 4 is a bushing, and 5 is a
It is a PD (instrument transformer), and all of these parts are filled with SF ₆ gas, which is an insulating fluid. 6 is a high voltage conductor (bus bar), 7 is an SF ₆ gas lead-out and introduction pipe 8 is an insulating spacer, and 9 is an airtight container.

FIG. 2 shows details of the gas piping, which is normally housed within the housing. 90 is an on-off valve for the disconnector section piping, 91 is an on-off valve for the chopper and disconnector section piping, 92 is an on-off valve for the bushing side isolator section piping,
93 is the on-off valve for the PD section piping, 94 is the on-off valve for the bushing section piping, 95 is the overall on-off valve 10 is 90~
Gas piping from 94 to 95, 11 is pressure gauge 12
is a detection device. Note that the on-off valves 90 to 95 are normally closed.

Figure 3 shows the details of the detection device.
1 is the main body of the detection device, 122 is the detection substance, for example,
For molten alumina 60mesh 100g, add promocresol purple solution (bromocresol purple 1
(g was dissolved in 95% ethyl alcohol to make 100 ml), and then 5 ml of 0.01N NaOH solution was added to uniformly color the solution, and then dried under reduced pressure. 123 is a see-through window, 124 is a seal ring, 125 is a screw-in see-through window support, and 126 is a detection substance support member. The on-off valve 95 and the detection device main body 121 are connected by a bolt (not shown; the bolt hole (not shown) is perpendicular to the flow direction of the detection device gas) or the like. Reference numeral 127 denotes a light shielding plate, which is attached to the main body 121 so as to be removable only during inspection.

With this configuration, if abnormal discharge occurs in the SF ₆ gas equipment, SF ₄ (sulfur tetrafluoride), SOF ₂ (thionyl fluoride), SO ₂ (sulfur dioxide gas), HF (hydrogen fluoride) ) and other _SF6 gas decomposition products. Although these gases are removed by a part of the adsorbent disposed inside, a constant equilibrium concentration is maintained when a steady abnormal discharge occurs.

Now, if an abnormal discharge is occurring in the PD5 part, a certain concentration of SF ₄ , SOF ₂ ,
SF ₆ gas containing SO ₂ and HF is present. To inspect the PD section, open the on-off valve 93 and then
Open 5. The SF ₆ gas in the PD section flows into the detection device, comes into contact with the detection substance, and then flows out into the atmosphere through the support material 126. At this time, the detection substance 122
is an acidic gas. It reacts with SF ₄ , SOF ₂ , SO ₂ , HF, etc. and changes from blue-purple to yellow. Therefore,
Since the PD part does not generate discharge when it is normal, it can be determined that the PD part is abnormal. If there is no abnormality in the PD section, the bushing section can be inspected by closing the on-off valve 93 and then opening the on-off valve 94. If discoloration is observed, the detection device main body 121
Convert.

Since discharge does not occur in the bushings and PD sections under normal conditions, it can be determined that there is an abnormality if a change in color is observed. However, since there is an opening/closing operation in the disconnector and disconnector sections, decomposition gas can be observed even under normal conditions. It's also possible. Therefore, when testing using this detection device, the frequency of replacement will decrease if the testing is performed sequentially starting from the lowest amount of decomposed gas produced. For example, it is recommended to inspect in the order of PD → bushing → disconnector → disconnector.

The presence or absence of an abnormality in the disconnector or the disconnector does not completely match the occurrence of discoloration, but it can be easily determined by checking the operating status and re-examining it after a period of time.

As described above, according to the present invention, the following effects can be obtained.

(1) Multiple gas categories can be inspected just by operating the valves.

(2) If the detection object changes color, simply replace the detection part.

In the above embodiment, an on-off valve is provided upstream of the detection device, but for example, the downstream side of the SF ₆ gas flow within the detection device may be closed, and the detection device may be used as a stop valve.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a detection device which is an embodiment of the present invention, FIG. 2 is a configuration diagram of the vicinity of the detection section,
FIG. 3 is a sectional view of the detailed configuration of the detection section. In addition,
The same reference numerals in the figures indicate the same or corresponding parts. In the figure, 1 is a disconnector, 2 is a disconnector, 3 is a grounding device, 6 is a bus bar, 7 is a pipe, 9 is an airtight container, 90-
95 is an on-off valve, and 12 is a detection device.

Claims (1)

[Scope of Claims] 1. In an electrical device in which a conductor is housed in a plurality of sealed containers filled with an insulating fluid, divided into predetermined units and connected, the insulating fluid drawn out from each of the sealed containers An abnormality detection device for electrical equipment, characterized in that a detection body that reacts with decomposed products of the insulating fluid is connected through a valve that selectively opens and closes a flow path of the insulating fluid. 2. An abnormality detection device for electrical equipment according to claim 1, characterized in that a detection substance in which bromocresol purple is supported on molten alumina grains is used as a detection substance.