JPH066489Y2 - Dryer for oil-filled electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for oil-filled electrical equipment such as transformers, for example, and is a drying apparatus for oil-filled electrical equipment that removes water from the insulating paper of the equipment body. It is about.

[Prior Art] FIG. 2 is a configuration diagram showing a drying device used for a transformer as an example of a conventional drying device for oil-filled electrical equipment. In the drawing, (1) is an outer box of the transformer, and (2) Is the transformer body placed inside the outer box (1) as the device body, and (3) is the outer box (1)
Insulating oil, for example, which is filled to a depth of about 50 cm,
(4) is a heating pipe whose both ends are connected to the lower part and the ceiling part of the outer box (1), (5) is a circulation pump provided in the middle of the heating pipe (4), and (6) is A heater provided in the middle of the heating pipe (4), and a spray nozzle (7) attached to one end of the heating pipe (4).

The outer box (1) is connected to the outer box (1) via a pipe.
An exhaust device for reducing the pressure inside.

In the conventional drying device configured as described above, first, the circulation pump (5) is driven to circulate the insulating oil (3) between the inside of the outer box (1) and the heater (6). Then, the insulating oil (3) is heated by the heater (6) and then atomized by the spray nozzle (7) to contact the transformer body (2) and heat the transformer body (2). In this way, when the transformer body (2) is heated, the moisture contained in, for example, insulating paper in the transformer body (2) becomes vapor. In this state, when the exhaust device (8) is driven to depressurize the inside of the outer box (1), the water content of the transformer body (2) changes to
It is removed as steam to the outside of the outer box (1), and the transformer body (2)
Is dried.

In addition, after the transformer body (2) has been dried, when a person enters the outer box (1) to perform work, for example, for measurement and inspection, the outer box (1) is in a heated state. 1) It is necessary to cool the inside. Such cooling in the outer box (1)
A method of turning off the heater (6) and waiting for natural cooling of the transformer main body (2), and as shown in FIG. 3, the transformer main body (2) is once immersed in the insulating oil (3) to be cooled, and then the insulating oil (3) is cooled. It is carried out by either method of pulling out (3) and allowing a person to enter.

[Problems to be Solved by the Invention] In the transformer using the drying device configured as described above, the cooling in the outer box (1) after drying is performed by a method of waiting for natural cooling and an insulating oil (3). ), The transformer main body (2) is dipped in either method.

The present invention has been made to solve the above problems, and an object thereof is to obtain a drying device for an oil-filled electrical device in which cooling in the outer box after drying the device body can be performed easily in a short time. .

[Means for Solving the Problems] A drying device for an oil-filled electrical device according to the present invention includes a cooler connected to an outer box.

[Operation] In this invention, the inside of the outer box is cooled by the insulating oil circulating between the cooler and the inside of the outer box.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a dryer for a transformer showing an embodiment of the present invention. The same or corresponding parts as in FIG. 2 are designated by the same reference numerals, and the description thereof is omitted.

In the figure, (9) is a cooling pipe whose both ends are connected before and after the heater (6) of the heating pipe (4), respectively.
0) is a cooler connected in the middle of the cooling pipe (9).

In the drying device configured as described above, when heating and drying the transformer body (2) first, the heating pipe (4) is used.
A switching valve (not shown) at the branch point between the cooling pipe (9) and the cooling pipe (9) is adjusted to circulate the insulating oil (3) in the outer box (1) and the heater (6) as in the conventional example. At the same time, the exhaust device (8) may be driven.

Next, when cooling the inside of the outer box (1) after drying the transformer body (2), after stopping the heater (6) and the exhaust device (8), the switching valve is adjusted and the insulating oil (3) ), The insulating oil (3) is circulated in the outer box (1) and the cooler (10). Then, the cooler (10) cools the insulating oil (3), and the inside of the outer box (1) is also cooled through the insulating oil (3).

Further, in this embodiment, the cooler (10) is connected to the heating pipe (4).
Since it is branched and connected, the heating and cooling of the insulating oil (3) can be switched only by adjusting the switching valve at the branch point, and the operation is simple.

Although the cooling pipe (9) provided with the cooler (10) is connected to the heating pipe (4) in the above embodiment, the cooling circulation path having the cooler (10) is It may be provided separately from the circulation path of the heater (6) in the outer box.

Further, in the above-mentioned embodiment, the dryer for the transformer is shown as the dryer for the oil-filled electrical equipment, but it may be a dryer for other oil-filled electrical equipment such as a reactor.

[Effects of the Invention] As described above, in the drying apparatus for an oil-filled electric device of the present invention, the cooler is connected to the outer box, and the insulating oil is circulated between the cooler and the outer box. Since the inside of the outer box is cooled, there is an effect that the inside of the outer box can be easily cooled in a short time after the device body is dried.

[Brief description of drawings]

FIG. 1 is a block diagram of a dryer for a transformer showing an embodiment of the present invention, FIG. 2 is a block diagram of a transformer for a dryer showing an example of a conventional dryer for oil-filled electrical equipment, and FIG. FIG. 3 is a configuration diagram showing a state where the device body of FIG. 2 is immersed in insulating oil. In the figure, (1) is the outer box, (2) is the transformer body,
(3) insulating oil, (6) heater, (8) exhaust device,
(10) is a cooler. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A heater connected to an outer box of an oil-filled electric device to heat a device body through insulating oil, and an exhaust gas connected to the outer box to remove water in the device body as steam to the outside of the outer box. And a cooler for cooling the insulating oil, which is connected to the outer box and circulates the insulating oil between the cooler and the outer box. A device for drying oil-filled electrical equipment that cools the inside of the box.