JPH0343696Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to an oil-filled electrical appliance equipped with a separately installed heat radiating device, and in particular an upper oil guide pipe that communicates the interior of a tank housing the electrical appliance with the interior of the separately installed heat radiating device. and a connecting pipe that communicates the inside of the conservator and the inside of the electric appliance via a Buchholz relay.

[Prior art and its problems]

FIG. 3 is a structural diagram of an oil-filled electrical appliance equipped with a conventional separately installed heat dissipation device 37, showing the inside of a tank 33 that houses an electrical appliance body 31 and filled with insulating oil 32, and a radiator that dissipates heat loss from the main body 31. 34 and this heat sink 34
The upper and lower common oil pipes 35 that support the oil pipes and communicate with each other, and the upper oil guide pipe 38 and the lower oil guide pipe 39 communicate with each other to form an oil circulation circuit. Common oil pipe 3
4 and 35 are supported by a support device 36.
A conservator 40 that compensates for volumetric changes due to temperature changes in the insulating oil 32 in the oil circulation circuit is disposed above the heat dissipation device 37, and its interior is connected to the tank 32 via a connecting pipe 42 equipped with a Butzholz relay 41.
It communicates within. The highest part of the tank 33 and the inside of the connecting pipe 42 are also communicated via the connecting pipe 42a, and the gas that is generated due to a minor failure of the electric appliance main body 31 and accumulated at the highest part moves to the Butzholz relay 41.
It is now being detected by

Generally, when a separately installed heat radiating device is used, the distance between the device and the tank becomes large, and the length of the connecting pipe 42 also becomes long. Further, the thickness of the connecting pipe 42 is determined by the size of the Butzholz relay 41, and for economic reasons, its types are limited to several types, with a maximum diameter of about 100 mm.
Therefore, in the above-mentioned conventional structure, when a serious failure occurs in the main body 31 and the oil is decomposed and the pressure inside the tank becomes high, the connecting pipe 42 is thin to prevent the rapid oil flow that occurs toward the conservator 40. As a result, the oil flow resistance is large and the Butzholz, which operates with a rapid oil flow, has the disadvantage of lowering its serious fault detection sensitivity. Furthermore, since the connecting pipe 42 is thin, its movement is slow in detecting the gas generated in the tank 33, resulting in a delay in detection.

[Purpose of invention]

The object of this invention is to overcome the above-mentioned conventional drawbacks and provide a structure for an oil-filled electrical appliance equipped with a separately installed heat dissipation device that improves the detection accuracy and speed of the Butzholz relay.

[Key points of the idea]

According to the configuration of this invention, the above object is achieved by arranging the upper oil guide pipe in an upward slope from the top of the tank toward the heat dissipation device, and connecting the connecting pipe to a convex part that protrudes upward near the highest part in the oil circulation circuit. Provided for. With this configuration, since the oil guide pipe is thick, a rapid oil flow due to the high pressure generated in the tank is generated toward the conservator, quickly reaches the Butzholz relay, and activates it. Furthermore, the gas in the tank travels through the oil guide pipe, which has an upward slope and a large diameter, and collects at an upwardly protruding convex portion where it is quickly detected. In particular, when insulating oil is fed by a pump, the gas moves more quickly and detection is faster than in the conventional case where gas moves naturally.

[Example of idea]

FIG. 1 is a structural diagram of an oil-filled electric appliance equipped with a separate heat radiating device according to an embodiment of the invention, and the same reference numerals indicate those that are the same as those described above or have the same functions. The highest part of the tank 33 that houses the electrical appliance body 31 and is filled with insulating oil 32 (in the figure, the top of the bushing pocket 33a) and the upper common oil pipe 35 of the separate heat radiating device 37 are located at an upward slope toward the oil pipe. They are connected by an oil guiding pipe 1 that is thick enough to pass through the amount of oil that carries the heat loss generated by the electrical appliance main body 31. In addition, the lower common oil pipe 35 of the separate heat dissipation device 37 and the lower part of the tank 33 are also connected by an oil guide pipe 39 similar to the oil guide pipe 1. Tank 33 → Oil guide pipe 1 →
Upper common oil pipe 35 → radiator 34 → lower common oil pipe →
The oil guide pipe 39 constitutes an oil circulation circuit from the tank. The convex portion 2 that protrudes inside the conservator 40 and above the upper common oil pipe 35 is the Buchholz relay 4.
1 is connected by a connecting pipe 3.

In this way, since the tank 33 and the vicinity of the Buchholz relay 41 are connected by a thick oil guide pipe, the high pressure and gas generated in the tank 33 quickly reach the Buchholz relay 41 and operate it.

Figure 2 is another embodiment of this invention, and the difference from Figure 1 is the upper oil guide pipe 1 near the highest part of the oil circulation circuit.
A convex portion 21 protruding upward is provided to facilitate gas accumulation, and a connecting pipe 2 from here to the conservator 40 is provided.
The reason is that 2 was established. This is conservator 40
It is suitable when the upper common oil pipe 35 is close to the upper common oil pipe 35 and piping of the connecting pipe is difficult.

[Effect of idea]

As is clear from the above explanation, in an oil-filled electrical appliance equipped with a separate heat radiator, by arranging the upper oil pipe in an upward slope from the top of the tank toward the heat radiator, the gas generated in the tank can be gathers at the top and moves rapidly along the uphill slope. Then, by providing a connecting pipe that communicates the inside of the conservator with the inside of the oil circulation circuit at the highest part of the oil circulation circuit or a convex part protruding upward in the vicinity thereof, gas collects in the convex part and the Buchholz tube provided in the connecting pipe is provided. A relay can quickly detect the occurrence of gas. In particular, when the oil circulation circuit is of the oil feeding type, the gas is transported by oil flow rather than by natural movement as in the past, so it can be detected even faster. Furthermore, if a major failure occurs in the tank and the oil decomposes and the pressure inside the tank increases, a rapid oil flow will occur toward the conservator, but in this case, the oil flow will flow through the large-diameter oil guide pipe. Since the oil reaches the Buchholz relay, the oil flow resistance is not as large as in the past, so the accuracy and speed of the Buchholz relay, which operates based on the oil flow speed, are improved.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of an oil-filled electrical appliance equipped with a separately installed heat dissipation device according to an embodiment of this invention, Fig. 2 is a conceptual diagram of an oil-filled electrical appliance of another embodiment of this invention, and Fig. 3 is a conceptual diagram of a conventional separately installed electrical appliance. FIG. 2 is a conceptual diagram of an oil-filled electrical appliance equipped with a heat dissipation device. 1, 39... Oil guiding pipe, 2, 22... Convex portion, 3,
21... Connecting pipe, 31... Electric appliance body, 32... Insulating oil, 33... Tank, 37... Heat dissipation device, 40
...Conservator, 41...Butzuchholz relay.

Claims (1)

[Scope of utility model registration request] A main body of the electric appliance, a tank containing the main body and filled with insulating oil, a heat radiating device that is placed separately from the tank and dissipating the heat loss of the main body, and an upper and a lower part of the inside of the heat radiating device and the inside of the tank, respectively. an oil guide pipe that communicates with each other to form an oil circulation circuit; a conservator that compensates for volumetric changes in the amount of oil in the oil circulation circuit and is provided above the heat dissipation device; In one equipped with a communication pipe that communicates with the inside of the circuit via a Butzholz relay,
Another feature of the present invention is that the upper oil guide pipe is arranged on an upward slope from the top of the tank toward the heat radiating device, and the connecting pipe is provided in a convex part that projects upward near the highest part in the oil circulation circuit. Oil-filled electrical equipment equipped with a stationary heat dissipation device.