JPH0414804A - Breathing apparatus of diaphragm-system conservator - Google Patents

Abstract

PURPOSE:To eliminate a need for a humidity-absorbing breathing device and to reduce a maintenance operation by a method wherein a hermetically sealed variable volume expansion chamber in the inside of a housing case used also as a spouted-oil housing tank is connected to the upper-part space inside a tank of a diaphragm-system conservator and to a pressure discharge device and a purge valve which is opened at the same pressure as the operating pressure of the pressure discharge device is attached to the expansion chamber. CONSTITUTION:At a normal operation, a pressure discharge device 8 and a purge valve 14 are in a closed state and an expansion chamber A is connected to only a conservator 2 via a coupling tube 6. As an insulating oil is expanded and contracted, the volume at the upper-part space of a tank of the conservator 2 is increased and decreased. In accordance with this operation, a bag 12 of a breathing device 10 is expanded and contracted as shown by arrows (x), and the inner volume of the expansion chamber A is increased and decreased. As a result, a pressure change portion is absorbed, and an internal pressure is kept nearly at an atmospheric pressure. On the other hand, when the internal pressure of a tank of a transformer 1 is increased and the pressure discharge device 8 is operated at an accident, the pressure inside the expansion chamber A is increased suddenly ad the purge valve 14 is opened. As a result, the air inside the expansion chamber A is discharged and an insulating oil which has been spouted is housed quickly inside the expansion chamber A.

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention is directed to an oil-filled stationary machine 2! This invention relates to a breathing device for a diaphragm-type conservator that prevents deterioration of insulating oil (such as a transformer 1-shunt reactor).

B9 Summary of the Invention The present invention provides an oil-filled stationary equipment equipped with a diaphragm-type conservator, in which a storage case for a breathing apparatus can also be used as an oil injection storage tank (-1) and can also be used as a conservator by forming an expansion chamber with a variable volume inside. By connecting to a pressure relief device, pressure changes in the upper space of the conservator due to engraving and storage of insulating oil are absorbed by increasing and decreasing the volume of the expansion chamber, thereby eliminating the influence of moisture and reducing maintenance. It was designed to achieve this.

C1 Prior Art In recent years, diaphragm-type conservators have been widely used as conservators attached to oil-filled stationary electrical equipment, such as transformers.

A diaphragm type conservator has a structure in which insulating oil and air are separated by a diaphragm, and the expansion and contraction of the insulating oil due to temperature changes is dealt with by allowing air to enter and exit the space above the diaphragm.The insulating oil is not directly connected to the air. Since there is no contact, deterioration of the insulating oil hardly progresses, and maintenance such as replacing or regenerating the insulating oil is not required.

However, if air containing moisture enters the space above the diaphragm in the conservator, condensation will form inside the conservator tank and moisture will accumulate on the diaphragm, causing various problems (rusting, diaphragm deterioration, etc.).
occurs.

To prevent stiffness, a device called a hygroscopic respirator, which removes moisture from the air flowing into the conservator, is always attached to the air inlet/outlet.

Fig. 3 shows an installation example of a diaphragm type conservator attached to a hygroscopic respirator, and Fig. 4 shows the structure of the hygroscopic respirator.

In the figure, 1 is a transformer and 2 is a diaphragm type conservator. In this conservator 2, the inside of the tank is divided into upper and lower halves by a diaphragm 2A, and the lower space of the diaphragm 2A is communicated with the tank of the transformer 1 via a pipe 3, and is filled with insulating oil 4. A valve 5 is inserted into the pipe 3. In addition, a connecting pipe 6 is connected to the air inlet and outlet of the upper space of the conservator 2 at a distance ff12A.
A hygroscopic respirator 30 is connected via the hygroscopic respirator 30.

The hygroscopic respirator 30 has a structure in which a mounting flage 32 is attached to the upper end of a cylindrical transparent container 31, an oil cup 33 is attached to the lower end, and a hygroscopic agent (such as silica gel) 34 is stored in the container 31. The oil cup 33 has a hollow convex portion formed at the bottom of the bottomed cylinder body, and a partition 33A is inserted into the hollow convex portion from above.
The cup 33 contains oil 35, and air flows in and out as shown by the arrows.

D. Problems to be Solved by the Invention The diaphragm type conservator of the 30-year-old moisture absorbing respirator having the above structure has the following problems.

(1) Moisture in the atmosphere is adsorbed by the moisture absorbent 34 while passing through the gaps between the moisture absorbents 34, but there is a limit to the amount of moisture adsorption.
If the moisture absorbent 34 is not replaced or regenerated at regular intervals,
The air containing moisture directly flows into the funsaheta 2.

Therefore, maintenance will be performed quite frequently. In order to lengthen the maintenance interval, it is necessary to increase the number of times the moisture absorbent 34 is stored, and the moisture absorbent 34 is required to be stored during storage.

(2) When the expansion or contraction is small, the oil 3 in the cup 33
According to 5, the upper space of the conservator 2, the moisture absorbing respirator 3
The inside of the cup 33 and the outside atmosphere are shut off, preventing new moisture from entering, and the period until the moisture absorbent 34 is replaced and regenerated becomes longer. However, if the expansion and contraction are large, the oil 35 in the cup 33 will oscillate. As air flows in and out as shown by the arrows, it is necessary to prevent the air from scattering as it flows in and out, resulting in a lack of oil in the oil.Moreover, dust also enters the atmosphere. ll1
l(35 is dirty.

Therefore, maintenance such as cleaning the inside of the pump 33 and replenishing or replacing oil is required during periodic inspections and when replacing or regenerating the moisture absorbent.

By the way, oil-filled stationary equipment is usually equipped with a pressure relief device. For example, as shown in FIG. 5, one end of a pressure relief pipe 7 is connected to the tank of the transformer 1, and a pressure relief device 8 is inserted into the pressure relief pipe 7. The other end of the pressure relief pipe 7 is a fuel oil storage tank 9
is connected to. The oil spray storage tank 9 is installed in the form of an underground tank and stores the oil in the event of an accident.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a diaphragm conservator breathing apparatus that is subject to maintenance.

E1 Means for Solving Problems The present invention is an oil-filled stationary equipment equipped with a diaphragm type conservator and a pressure relief device, in which a sealed variable volume expansion chamber is formed inside a storage case that also serves as an oil injection storage tank. The expansion chamber is connected to the upper space inside the tank of the diaphragm conservator and the pressure relief device, and the expansion chamber is equipped with an air vent valve that opens at a pressure equivalent to the operating pressure of the pressure relief device. That is.

F Function Normally, the expansion chamber is in a sealed state, and as the volume of the upper space inside the conservator tank increases or decreases due to the expansion or contraction of the insulating oil, the volume of the expansion chamber increases or decreases in response. increases or decreases. As a result, the pressure change is absorbed and the internal pressure is maintained at approximately atmospheric pressure. This will occur without contact with the external atmosphere, eliminating the influence of moisture.

G Example Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention, where 1 is an oil-filled stationary device such as a transformer, 2 is a diaphragm type conservator, and 3 is a communication between the tank of the transformer 1 and the tank of the conservator 2. Piping, 4 is insulating oil filled in the tank of the transformer 1 and the space below the diaphragm 2A of the conservator tank;
5 is a valve inserted into the pipe 3; 6 is the conservator 2;
a connecting pipe with one end connected to the air inlet/outlet of the upper space of the tank, 7 a pressure relief pipe with one end connected to the tank of the transformer I;
8 is a pressure relief device inserted into this pressure relief pipe 7, and IO is a breathing device that also serves as a spray oil storage tank.

The above breathing apparatus 10 has the following structure.

That is, the opening of the bag 12 made of a flexible diaphragm material (for example, woven fabric coated with synthetic rubber) is attached to the upper edge of the storage case 11, and the inside of the bag I2 inside the case 1.1 is inflated. Let's call it room A. The upper surface of this expansion chamber A is covered with a lid 13, and the other end of the connecting pipe 6 is connected to the conservator connecting part provided on the lid 13, and the other end of the pressure relief pipe 7 is connected to the pressure relief device connecting part. It's connected. Also, at M+3, an air vent valve 1 is opened at a pressure equivalent to the operating pressure of the pressure relief device 8.
4 are installed.

Next, the operation will be described. Under normal conditions, the pressure relief device 8 and the air vent valve 14 are in a closed state, and the expansion chamber A is connected to the connecting pipe 6.
It communicates only with conservator 2 via. In other words,
The air in the conservator 2 and the expansion chamber A is isolated from the outside atmosphere5. In this state, when the volume of the upper space of the tank of the conservator 2 increases or decreases due to the expansion and contraction of the insulating oil, the pressure in the upper space changes. do. In response to the kneading, the bag 12 of the breathing apparatus 1° expands and contracts in the direction of arrow X, and the internal volume of the expansion chamber A increases and decreases. As a result, the pressure change is absorbed and the internal pressure is maintained at approximately atmospheric pressure.

In this case, the maximum value of the internal volume of the expansion chamber A is set according to the larger of (response amount of insulating oil) x (atmospheric expansion volume due to temperature rise) and the amount of insulating oil spouted out in the event of an accident.

On the other hand, when the pressure inside the tank of the transformer 1 rises in the event of an accident and the pressure relief device 8 is activated, the pressure inside the expansion chamber A rapidly rises and the air vent valve 14 is opened. Therefore, the air in the expansion chamber A is discharged, and the insulating oil that has spouted out is quickly stored in the expansion chamber A.

Figures 2 (a) and (Cb) show modified examples of the breathing apparatus,
Fig. 2(a) shows an expansion chamber A formed using a bellows-type tank 15, and Fig. 2(b) shows that the storage case 11A, IIB, which is divided into two vertically, can be slid vertically and airtightly. This is a case in which the lower case IIB is slid to increase or decrease the volume of the internal expansion chamber A, and the chair operates in the same manner as in the previous embodiment.

Effect of H0 invention The following effects can be obtained with the above configuration.

(1) Moisture-absorbing breathing equipment is no longer required, reducing maintenance costs.

Securing the location and area is easy.

(3) Even with existing transformers, it is best to remove the moisture absorption breathing device of the conservator, remove the oil injection storage tank, install the breathing device, and connect the conservator to the pressure relief pipe.
Can be easily and inexpensively modified.

(4) The structure is medium-line, easy to maintain and monitor, and improves operational reliability.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the breathing apparatus for a diaphragm conservator according to the present invention, FIGS. 2(a) and 2(b) are block diagrams showing a modification of the breathing apparatus for a diaphragm conservator, 3 and 5 are configuration diagrams showing the conventional example, and FIG. 4 is a sectional view showing the structure of the conventional moisture absorbing respirator. l...Transformer, 2...Diaphragm type conservator, 2A・
Diaphragm, 6. Connecting pipe, 7. Pressure relief pipe, 8. Pressure relief device, 10. Breathing device, 11.11A and IIB. Storage case, 12. Bag, 13. Lid. 14... Air vent valve, 15... Bellows type tank, A... Expansion chamber. , see 1 sushi

Claims (1)

[Claims] (1) In oil-filled stationary equipment equipped with a diaphragm-type conservator and a pressure relief device, a sealed variable-volume expansion chamber is formed inside a storage case that also serves as an oil injection storage tank, and this expansion chamber is replaced by a diaphragm-type conservator. A breathing device for a diaphragm-type conservator, characterized in that the upper space inside a Beta tank communicates with a pressure relief device, and an air vent valve that opens at a pressure equivalent to the operating pressure of the pressure relief device is installed in the expansion chamber. .