JPH0673338B2 - Conservator oil level detector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conservator used in an oil-filled electric device, and more particularly to a device for detecting an oil level in the conservator.

[0002]

2. Description of the Related Art An oil tank contains electrical equipment such as a transformer or a reactor and insulating oil, and an expansion / contraction bladder is provided in a case communicating with the oil tank. In a conservator that escapes a change in the volume of insulating oil due to a change by breathing through the expansion and contraction sac, the inside of the expansion and contraction sac becomes atmospheric pressure and the bottom of the expansion and contraction sac becomes the oil surface.

In the above conservator, it is necessary to confirm the position of the oil level for maintenance, and the following oil level detection device has been conventionally known.

In the first example, a viewing window is provided on the side wall of the case, and in the second example, a vinyl oil column 22 is detachably attached to the case 1 of the conservator 3 via a valve 21 as shown in FIG. In the third example, as shown in FIG. 5, the float 23 is brought into contact with the bottom of the expansion / contraction bladder 2 in the case 1 and is interlocked with the dial type oil level detection device 25 via the rotating arm 24. It was made.

[0005]

Originally, since the case of the conservator is formed of a metal plate such as an iron plate, external rays are blocked and the insulating oil is colored. For this reason, it is difficult to visually recognize the bottom of the expansion and contraction sac in the above-described first conventional example.

In the second conventional example, the oil column cannot be always attached due to space constraints and the like.
It is necessary to move and install the oil column from another place.

Further, the third conventional example has a problem that the cost is high and the device often fails.

[0008]

SUMMARY OF THE INVENTION The present invention solves all of the above inconveniences, that is, one end of a line gauge in a conservator in which an expansion and contraction bladder is housed in a case and the expansion and contraction bladder communicates with the outside air. Is connected to the bottom of the expansion and contraction sac, and the other end of the line gauge is led out of the case.

[0009]

1 and 2 show a first embodiment of the present invention, and FIG. 3 shows a second embodiment. In the drawings, reference numeral 9 is an oil-filled electric device (eg, transformer or Reactor) and insulating oil 10 are contained in the oil tank 9. The case 1 of the conservator 3 is connected to the oil tank 9, and the oil tank 9 and the case 1 are connected through the through holes 11 formed in the upper plate of the oil tank 9. The inside is communicated, and the insulating oil 10 is also stored in the case 1.

A rubber expansion / contraction bladder 2 is housed in the case 1 and attached via a breathing mouthpiece 12 so that the expansion / contraction bladder 2 communicates with the outside air and is fixed to the bottom of the expansion / contraction bladder 2 by a line attachment. One end of the line gauge 4 such as a flexible string or wire is connected to the seat 13, and the other end of the line gauge 4 is led out of the case 1.

In the first embodiment shown in FIGS. 1 and 2, one end of a breathing pipe 5 communicating with the expansion and contraction bladder 2 is attached to the case 1, and the other end of the breathing pipe 5 is provided with a hygroscopic respirator 14. Is in communication with the outside air. The breathing pipe 5 itself having the hygroscopic respirator 14 is attached to most of conventional general conservators. Then, a box mounting seat 15 is connected in the middle of the breathing pipe 5, and the line storage box 6 is detachably mounted to the box mounting seat 15 by tightening screws 16.

The line gauge 4 whose one end is connected to the line mounting seat 13 has the expansion and contraction sac 2, the breathing mouthpiece 12, and the breathing pipe 5.
Inside, inside the box mounting seat 15, the other end is accommodated in the line storage box 6 with a margin, and the other end is attached to the line storage box 6.

Reference numeral h shown in FIG. 2 has the same dimension as the oil level change range H of FIG. 1, and the line gauge 4 portion of this range h is colored differently from the ground color of the line gauge 4 (for example, black).
Then, the line gauge 4 part of this range h is
Color-based markers (for example, blue, white, yellow, green, red, etc.) are displayed at% intervals. By the way, the color-coded indicator indicates that one end of the line gauge 4 is at the highest position in the case 1, that is, the oil amount is almost 1
At the time of 00%, the line gauge 4 located on the outward surface 17 of the box mounting seat 15 is colored blue (100%), and then the oil amount in the case 1 (75%, 50%, 25
%, Almost 0%), white, yellow, green, and red are applied to the portion located on the outward surface 17, and the outward surface 1
Reference numeral 7 is a reference surface for reading the oil surface.

Next, the operation and use of the first embodiment will be described. The line gauge 4 is pulled out or relaxed according to the expansion and contraction of the expansion and contraction bladder 2. At the time of inspection, the screw 16 is loosened to remove the line storage box 6, and the line gauge 4 is pulled and tensioned. At this time, if the blue portion of the line gauge 4 is located on the outward surface 17 as shown in FIG.
It can be seen that the oil amount inside is almost 100%, that is, the oil level is at the highest level, and if the yellow portion is located on the outward surface 17, the oil amount is 50%.

In the second embodiment of FIG. 3, pulleys 18 and 19 and a transparent tube 20 are attached to the case 1, and a scale 8 for reading the moving position of the line gauge 4 is displayed on the transparent tube 20. There is. The line gauge 4 whose one end is connected to the line mounting seat 13 is inserted into the transparent cylinder 20 via the pulleys 18 and 19 outside the case 1 and is connected to the other end of the line gauge 4 with the weight 7 for line tension. Have been drooped by. It should be noted that the weight 7 is of a weight sufficient to strain the line gauge 4, and should not be so heavy as to pull up the bottom of the expansion / contraction bladder 2. The entire length of the scale 8 is the same as the oil surface change range H of the case 1,
It goes without saying that the unit of oil amount of 0% to 100% is displayed from the top to the bottom.

Therefore, the weight 7 is moved up and down by the expansion and contraction of the expansion and contraction bag 2, and the measurer can detect the oil level in the case 1 by reading the scale 8 at the position of the weight 7.

[0017]

According to the first aspect of the present invention, the oil level in the case can be reliably detected by the moving position of the line gauge led out of the case, and a simple means causes a failure. It can be manufactured inexpensively.

According to the second aspect of the invention, in addition to the above effects, there is no space problem because the line gauge is passed through the breathing pipe which is an accessory of a general conservator. It is effective for a limited installation space.

According to the invention of claim 3, in addition to the effect of claim 1, it is possible to constantly monitor without any special work.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram at the time of detection in the above.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional example.

FIG. 5 is an explanatory diagram of another conventional example.

[Explanation of symbols]

 1 Case 2 Expansion and contraction sac 3 Conservator 4 Line gauge 5 Breathing pipe 6 Line storage box 7 Weight 8 Scale

Claims (3)

[Claims] 1. In a conservator in which an expansion and contraction sac is housed in a case and the expansion and contraction sac communicates with the outside air, one end of a line gauge is connected to the bottom of the expansion and contraction sac and the other end of the line gauge is connected. An oil level detection device for a conservator, which is led out of the case. 2. An expansion and contraction bladder is communicated with the outside air through a breathing pipe attached to a case, a line storage box is detachably attached to a middle of the breathing pipe, and a line gauge is passed through the breathing pipe and the line is connected. The oil level detection device for a conservator according to claim 1, wherein the other end of the gauge is housed in the line storage box. 3. The oil of the conservator according to claim 1, wherein a weight for line tension is attached to the other end of the line gauge, the other end is suspended, and a scale for reading the moving position of the line gauge is provided outside the case. Face detection device.