CN102483985A

CN102483985A - Electric transformer

Info

Publication number: CN102483985A
Application number: CN2010800380886A
Authority: CN
Inventors: 佐佐木英
Original assignee: HOKUSHIBA ELECTRIC CO Ltd
Current assignee: HOKUSHIBA ELECTRIC CO Ltd; Kitashiba Electric Co Ltd
Priority date: 2009-08-27
Filing date: 2010-07-12
Publication date: 2012-05-30
Anticipated expiration: 2030-07-12
Also published as: CN102483985B; JP5209581B2; HK1171284A1; JP2011049358A; WO2011024570A1

Abstract

Provided is an electric transformer wherein if a vegetable oil is used for a tap switching device, the variation of the property of the vegetable oil can be suppressed, and the performance of the tap switching device can be maintained. An electric transformer (1) is comprised of a switching device tank (5a) which contains a tap switching device (5), a rapeseed oil (5c) charged into the tank (5a), an oil expansion chamber (10) which stores the rapeseed oil (5c) supplied from the tank (5a), and a rubber bag (12) which is provided so as to fill the space in the oil expansion chamber (10) not filled with the rapeseed oil (5c), and the inside of the rubber bag (12) communicates with the outside of the oil expansion chamber (10).

Description

Transformer

Technical field

The present invention relates to possess the transformer of changer.

Background technology

In recent years, consider that motion has injects a kind of transformer of vegetable oil as iknsulating liquid from the viewpoint that improves the electric equipment environmental performance.For example, in the transformer shown in the following patent documentation 1 (Japan special table 2000-502493 communique), the vegetable oil that has added oxidation inhibitor is injected into transformer body inside.

In this transformer, absorbed by vegetable oil even dissolve in the moisture that has airborne oxygen to divide, because the effect of oxidation inhibitor has suppressed the oxidation of vegetable oil, thereby suppressed to cause the deterioration of vegetable oil, and can prolong the exchange life-span of vegetable oil because of oxidation.

The prior art document

Patent documentation

Patent documentation 1: Japan special table 2000-502493 communique

Summary of the invention

Invent problem to be solved

Yet, when carrying out repeatedly injecting vegetable oil in the changer that mechanicalness slides, because of the sediment that moisture generated (sediment) that vegetable oil absorbed can jog attached to the electrode of changer inside and slide mechanism on.Therefore, opposing increases because the sediment that adheres to for example can cause sliding and the friction powder increases, thereby the performance that changer self possibly take place is followed the variation of vegetable oil self condition and impaired.

On the other hand, from improving the viewpoint of transformer environment performance, hope not only to be directed against transformer itself, and also can use vegetable oil to come substitute mineral oil for changer.

In view of the foregoing, a kind ofly used under the plant oil condition, can realize that also the condition that suppresses vegetable oil changes, keeps the transformer of the performance of changer at changer even the object of the present invention is to provide.

Be used to solve the technical scheme of problem

The transformer of first invention has changer, and this transformer is characterised in that to possess: container, be equipped with said changer in it; Vegetable oil, it is injected in the said container as iknsulating liquid; And baffle, it covers on the surface of this vegetable oil, to cut off the contact between said vegetable oil and the air.

According to the transformer of first invention and since in the vegetable oil that injects in the container of changer is housed the surface body that is masked cover, suppressed to generate the phenomenon of sediment owing to airborne moisture.Therefore, not having the moisture that absorbs because of vegetable oil generates sediment, is that so-called vegetable oil self condition changes and follows this variation to cause the impaired problem of function of changer self.

Like this, according to the transformer of first invention, even on changer, use vegetable oil, the condition that also can suppress vegetable oil changes, and keeps the performance of changer.

The second invention transformer is characterised in that; In the transformer of first invention, possesses oily expanding chamber; It is connected with said container, stores the said vegetable oil that flows into from this container, and said baffle is set; So that the space segment beyond the said vegetable oil that stores in the oily expanding chamber is stated in this baffle filling residence, this baffle is the bag of the outdoor connection of inside and this oil expanding chamber.

According to the transformer of second invention since in the vegetable oil that injects in the container of changer is housed is full of this internal tank and flow in the oily expanding chamber, so, do not have the surface that contacts with air at this internal tank.And the bag that the surface of vegetable oil receives to be set up with the form of clogging the space segment beyond the vegetable oil in the oily expanding chamber covers.Expansion and the contraction of vegetable oil are followed owing to be communicated with expanding chamber outward in the inside of bag, and the variation in the corresponding said space of bag and shrink and expands can continue the oily surface of cover plant thus.Therefore, absorbed by vegetable oil,, also can suppress the variation of the condition of vegetable oil, keep the performance of changer even in changer, use vegetable oil owing to suppressed airborne moisture.

Description of drawings.

Fig. 1 is the whole pie graph that constitutes of indication transformer.

Fig. 2 is the pie graph that the oily expanding chamber of expression constitutes.

Embodiment

The transformer 1 of this execution mode is described with reference to Fig. 1.

As among Fig. 1 transformer 1 being carried out in its fuel tank 2 transformer body 3 being housed model utility representes, transformer 1 inner inject and dipping rapeseed oil 4 as iknsulating liquid, transformer 1 forms the structure that is sealed with this state.Thereby coiling once constitutes transformer body 3 with secondary coil 3b on 3a unshakable in one's determination.And transformer 1 possesses by the interior changer 5 that is contained in the fuel tank 2, and changer 5 is connected with secondary coil 3b respectively with once.

In among the switching device shifter fuel tank 5a (being equivalent to container of the present invention) of changer 5 switching device shifter main body 5b is housed.Switching device shifter main body 5b possesses tap selector and the change over switch of selecting any tap, and this change over switch cuts off load current when load, thereby to adjacent tap energising.In switching device shifter fuel tank 5a, inject rapeseed oil 5c, this rapeseed oil 5c rapeseed oil 4 interior with being injected into fuel tank 2 is identical, and switching device shifter main body 5b is in the state that is immersed among the rapeseed oil 5c.

Switching device shifter fuel tank 5a is inserted in the fuel tank 2 via peristome 2b under the state that has held switching device shifter main body 5b.Wherein, said peristome 2b is arranged on the upper isolation wall 2a of leakproof fuel cell 2 upsides.Top at switching device shifter fuel tank 5a is provided with driving mechanism 6b, and this driving mechanism 6b links with the driving shaft of the motor 6a that is used to drive change over switch.On the basis of the rotational delay that makes motor 6a through driving mechanism 6b, change over switch produces and slides, and contact (electrode) switches.In addition, in this execution mode, it is stained that the electric arc in order to prevent to switch because of contact causes producing charcoal, adopted the vacuum valve that makes contact portions become vacuum state.

Then, with reference to Fig. 2 explanation and the inner oily expanding chamber 10 that is connected of switching device shifter fuel tank 5a.

Oil expanding chamber 10 possesses: communicating pipe 11, it is communicated with switching device shifter fuel tank 5a and oily expanding chamber 10; Rubber bag 12 (being equivalent to bag) as baffle of the present invention, it is arranged in the oily expanding chamber 10; Tube connector 13, the internal communication of itself and rubber bag 12; Air-breather 14, it is arranged on the end of tube connector 13; And oil level indicator 15, it measures the oil mass of the rapeseed oil 5c in the oily expanding chamber 10.

Communicating pipe 11 is the pipelines that are used between switching device shifter fuel tank 5a and oily expanding chamber 10, making rapeseed oil 5c to flow back and forth.When injecting oil, the rapeseed oil that is filled in ormal weight among the rapeseed oil 5c in the switching device shifter fuel tank 5a flow in the oily expanding chamber 10 via this communicating pipe 11.On the other hand, when usually transformer 1 being used, the volume of rapeseed oil 5c follows the temperature of transformer 1 and changer 5 to rise and change, and therefore rapeseed oil 5c flows between switching device shifter fuel tank 5a and oily expanding chamber 10 back and forth.

10 one-tenth cylindric frameworks of oil expanding chamber, the bottom was connected with communicating pipe 11, and top is connected with tube connector 13.

And, at the upside of oily expanding chamber 10, the rubber bag 12 that is connected with tube connector 13 is set, so that the space segment beyond the rapeseed oil 5c in the oily expanding chamber 10 is lived in these rubber bag 12 fillings.Because atmospheric pressure is born via tube connector 13 and air-breather 14 in rubber bag 12 inside, so rubber bag 12 shrinks or expands according to its internal pressure with from the pressure differential between the external pressure of rapeseed oil 5c.

Here, above oily expanding chamber 10, be provided with not shown vent valve, when oil injects, drive valve through vent valve, the rapeseed oil 5c that flow in the oily expanding chamber 10 from switching device shifter fuel tank 5a is full of the whole spaces beyond the rubber bag 12 in the oily expanding chamber 10.So, the vent valve rapeseed oil 5c that just spues soon.In this state, through closing vent valve, the rapeseed oil 5c in the oily expanding chamber 10 is maintained at a kind of do not have surface portion and air state of contact.

Air-breather 14 is devices of atmosphere dehumidifying usefulness, and its inside is incorporated with drier (silica gel).Do not have illustrated oil tank (oil pot) etc. in the setting of the bottom of air-breather 14, be exposed under the atmosphere always to prevent drier.

Oil level indicator 15 utilizes arm 15b to measure the angle variation of the height change of rapeseed oil 5c in the oily expanding chamber 10 as arm 15b.Be provided with the 15a of contact portion that contacts with the bottom of rubber bag 12 at the tip place of arm 15b.

According to the transformer that possesses above formation 1; In a single day rapeseed oil 5c in the switching device shifter fuel tank 5a shrinks; Atmosphere is inhaled into and forms dry air in the air-breather 14, and this dry air is introduced in the rubber bag 12 via tube connector 13, and therefore rubber bag produces and expand.On the other hand, in a single day the rapeseed oil 5c in the switching device shifter fuel tank 5a expands, and the dry air in the rubber bag 12 is vented to air-breather 14 via tube connector 13, and is discharged in the atmosphere.

Like this, in the expansion and contraction of said rapeseed oil 5c,, can suppress airborne moisture and absorbed by vegetable oil because the rapeseed oil 5c in the oily expanding chamber 10 can not touch atmosphere etc.And because the air in the rubber bag 12 also is the dry air through air-breather 14, the moisture that can suppress equally in the atmosphere is absorbed by rapeseed oil 5c via rubber bag 12.Therefore, it is impaired that the condition of rapeseed oil 5c self can not change and then cause the function of changer 5 self because the moisture that absorbs among the rapeseed oil 5c becomes sediment.

Through this form, according to the transformer 1 of this execution mode, even in changer 5, use rapeseed oil 5c as vegetable oil, the condition that also can suppress rapeseed oil 5c changes, and keeps the performance of changer 5.

In addition, in this execution mode, the vegetable oil of rapeseed oil as iknsulating liquid is illustrated, but not only for therewith.For example, can also adopt soybean oil, sunflower oil, cottonseed oil, olive oil, safflower oil, Jojoba Oil, Leix gram lazyness to rein in seed oil (Lesquerella oil) and Bei Luoniya oil (beronia oil) etc.

In addition, in this execution mode, the formation that oily expanding chamber 10 is possessed as the rubber bag 12 of baffle is illustrated, but is not limited in this.All can be used as baffle so long as cover the lip-deep object of rapeseed oil 5c that is infused in the switching device shifter fuel tank 5a.For example, oily expanding chamber 10 is not set, but the whole air bag in the surface that covers the rapeseed oil 5c in the switching device shifter fuel tank 5a etc. is set.

Symbol description

1: transformer; 2: fuel tank; 3: transformer body; 4,5c: rapeseed oil (vegetable oil); 5: changer; 5a: switching device shifter fuel tank (container); 5b: switching device shifter main body; 10: oily expanding chamber; 12: rubber bag (bag, baffle); 14: air-breather.

Claims

1. transformer, it has changer, and said transformer is characterised in that to possess: container, be equipped with said changer in it; Vegetable oil, it is injected in the said container as iknsulating liquid; And baffle, it covers on the surface of said vegetable oil, to cut off the contact between said vegetable oil and the air.

2. transformer according to claim 1; It is characterized in that possessing oily expanding chamber; This oil expanding chamber is connected with said container, stores the said vegetable oil that flows into from this container, and said baffle is set; So that the space segment beyond the said vegetable oil that stores in the oily expanding chamber is stated in this baffle filling residence, this baffle is the outdoor bag that is communicated with inner and this oil expanding chamber.