CN201608038U

CN201608038U - Compact oil-immersed type transformer

Info

Publication number: CN201608038U
Application number: CN200920269934XU
Authority: CN
Inventors: 潘有龙; 刘波; 郭庆
Original assignee: Tebian Electric Apparatus Stock Co Ltd
Current assignee: Tebian Electric Apparatus Stock Co Ltd
Priority date: 2009-11-04
Filing date: 2009-11-04
Publication date: 2010-10-13
Anticipated expiration: 2019-11-04

Abstract

The utility model relates to a compact oil-immersed type transformer which comprises a transformer oil tank (6) filled with transformer oil, a transformer body (5) and transformer accessories, wherein the transformer body (5) is placed in the transformer oil of the transformer oil tank (6) and comprises a high-voltage coil and a lower-voltage coil; and the transformer accessories include a high-voltage side casing and a lower-voltage side casing. The transformer further comprises a protective switch capable of enabling the self-protection function of the transformer, and the protective switch is connected between the high-voltage side casing and the lower-voltage side casing and adopts a load protective switch (1) of a magnetic retaining open breaker. The compact oil-immersed type transformer has the advantages of simple and compact structure, low manufacture cost and reliable operation.

Description

The compact oil-filled transformer

Technical field

The utility model belongs to technical field of transformer manufacturing, is specifically related to a kind of compact oil-filled transformer.

Background technology

At present, the domestic combined transformer that can protect equipment and transformer equipment to combine together the transformer high and low pressure that adopts mainly is a box-type substation, and mainly be divided into two kinds by structure: European case becomes and American case becomes.European case becomes to be made up of transformer room, low-pressure chamber, hyperbaric chamber, and wherein hyperbaric chamber and low-pressure chamber all dispose kinds of protect device and metering device, and these protections and the metering device that are disposed cost an arm and a leg, and volume is bigger; Two parts before and after the structure that American case becomes is divided into; the front be the high and low pressure operation room every; described operation room is every interior high-low pressure binding post, on-load switch, shunting switch, plug-in fuse, the oil level indicator etc. of including; the rear portion is oiling casing and fin, transformer body and high voltage load switch, protection with fuse all in the oiling casing.

Above-mentioned two kinds of box type transformers all exist volume big, complex structure, cost cost height, a lot of not acceptant problems of user.

The utility model content

The technical problems to be solved in the utility model is at above shortcomings in the prior art, and a kind of simple and compact for structure, compact oil-filled transformer that cost is low and reliable is provided.

Solving the problems of the technologies described above the technical scheme that is adopted is that this compact oil-filled transformer comprises oil tank of transformer, transformer body and the transformer accessory that is filled with transformer oil; described transformer body places the transformer oil of oil tank of transformer; include high-tension coil and low-voltage coil in the transformer body; described transformer accessory includes high-pressure side sleeve pipe and low-pressure side sleeve pipe; this transformer also includes the protection switch that makes transformer possess self-protection function, and described protection switch is connected between described high-pressure side sleeve pipe and the high-tension coil.

Described protection switch can comprise Switch main body and operating grip, and Switch main body is located in the oil tank of transformer, and operating grip is located at the outside of oil tank of transformer.

Wherein, described protection switch adopts magnetic to keep cut-off device load protection switch.

Certainly, above-mentioned protection switch also can adopt the protection switch of other versions that can realize said function to replace.

Preferably, between high-pressure side sleeve pipe and protection switch, also be connected with the reserve current limiting fuse.

Further preferably, at step down side 0 zero-sequence transformer that is used to monitor the transformer zero-sequence current is housed mutually.

Described high-pressure side sleeve pipe also can be substituted by high-pressure side cable connect-disconnect plug.

When above-mentioned magnetic kept cut-off device load protection switch to be installed in the transformer oil of oil tank of transformer, transformer possessed following defencive function:

1) open-phase protection: have single-phase detection, three functions that link can effectively be avoided the transformer phase-deficient operation.

2) overload protection: when transformer overload, magnetic keeps the action of cut-off device load protection switch, can automatic disconnection move, and avoids the transformer long-time running to be damaged.

3) low oil level protection: cross when low when oil level in the transformer, magnetic keeps the action of cut-off device load protection switch, and the automatic disconnection operation avoids the operation of transformer low oil level to cause damage.

4) high oil temperature protection: surpass a threshold value at temperature of oil in transformer, during as 145 ℃, magnetic keeps the action of cut-off device load protection switch, and the automatic disconnection operation avoids the operation of the high oil temperature of transformer to cause damage.

5) transformer internal short-circuit protection: when Short Circuit Fault on Secondary Transformer, magnetic keeps cut-off device protection switch and reserve current limiting fuse to be used, and the automatic and circuit disconnection of energy avoids transformer to be subjected to further destruction.

6) realize transformer the load branch, close, have the on-load switch handoff functionality, the power supply of manually switching and close a floodgate.

For above error protection, after above fault clearance, can reset by manually magnetic being kept cut-off device load protection switch to close a floodgate, transformer is come into operation again, and need not to change the accessory that magnetic keeps cut-off device load protection switch.

Existing power transformer product will be realized above-mentioned these functions, often will realize by the mode that a plurality of protective devices are installed, thereby makes that the structure of transformer is very complicated huge.And keep cut-off device load protection switch just can realize above-mentioned a plurality of self-protection function by employing magnetic in the utility model transformer, thus need not to be provided with in addition these protection annexes such as plug-in fuse, oil level indicator, so it is simple and compact for structure.In use, only need the high pressure inlet wire is connected with high-pressure side sleeve pipe or cable connect-disconnect plug terminal, low-voltage side outlet is connected with the low-tension bushing terminal, just can directly come into operation, so both reduced the cost input, shorten construction period, greatly improved the operating efficiency of power construction department again.

Description of drawings

Fig. 1 is the outline drawing of the utility model compact oil-filled transformer

Fig. 2 is the vertical view of Fig. 1

Among the figure: 1-magnetic keeps cut-off device load protection switch 2-high-pressure side cable connect-disconnect plug 3-low-pressure side sleeve pipe 4-zero-sequence transformer 5-transformer body 6-oil tank of transformer 7-guidance panel

Embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail.

Following examples are indefiniteness embodiment of the present utility model.

The transformer that adopts in the present embodiment is a voltage 10kV level, and capacity is the transformer of 630kVA.

As shown in Figure 1, the utility model compact oil-filled transformer comprises oil tank of transformer 6, transformer body 5 and the transformer accessory that is filled with transformer oil.Transformer body 5 places the transformer oil of oil tank of transformer 6, and oil tank of transformer 6 outer surfaces are provided with control panel 7.Transformer accessory comprises respectively from parts such as the high-pressure side cable connect-disconnect plug 2 (it is furnished with lightning arrester, also can directly adopt sleeve pipe to draw) that high-pressure side A, B, C draw mutually, low-pressure side sleeve pipes.

Also include the protection switch that is connected between high-pressure side cable connect-disconnect plug 2 and the high-tension coil in the utility model transformer; described protection switch comprises Switch main body and operating grip; Switch main body is located in the transformer oil of oil tank of transformer 6, and operating grip is located on the control panel 7 of oil tank of transformer outside.

The magnetic that described protection switch can adopt Shanghai Cusparia company to produce keeps cut-off device load protection switch 1.It is MX3AN1MDE50 that the magnetic of the transformer adopting in this example keeps the concrete model of cut-off device load protection switch 1.

Keep also being connected with reserve current limiting fuse (not shown) between the cut-off device load protection switch 1 at high-pressure side cable connect-disconnect plug 2 and magnetic; when Short Circuit Fault on Secondary Transformer; because of short circuit current very big; reserve current limiting fuse fuse failure; make the disconnection that connects between high-pressure side cable connect-disconnect plug 2 and the high-tension coil; thereby transformer circuit can be disconnected, avoid its damage.

In addition; can install zero-sequence transformer 4 mutually additional in low-pressure side 0 according to customer requirements; the effect of installing zero-sequence transformer in low-pressure side 0 mutually additional is a monitoring transformer zero-sequence current; when transformer threephase load imbalance and generation single-phase earthing; zero-sequence current is very big; at this moment the zero-sequence current that induces of zero-sequence transformer also can be very big, this signal can be sent to the protective device that the user provides for oneself, impels the protective device action.

Be understandable that above execution mode only is the illustrative embodiments that adopts for principle of the present utility model is described, yet the utility model is not limited thereto.For those skilled in the art, under the situation that does not break away from spirit of the present utility model and essence, can make various modification and improvement, these modification and improvement also are considered as protection range of the present utility model.

Claims

1. compact oil-filled transformer; comprise the oil tank of transformer (6), transformer body (5) and the transformer accessory that are filled with transformer oil; described transformer body (5) places the transformer oil of oil tank of transformer (6); transformer body includes high-tension coil and low-voltage coil in (5); described transformer accessory includes high-pressure side sleeve pipe and low-pressure side sleeve pipe; it is characterized in that this transformer also includes the protection switch that makes transformer possess self-protection function, described protection switch is connected between described high-pressure side sleeve pipe and the high-tension coil.

2. compact oil-filled transformer according to claim 1 is characterized in that described protection switch comprises Switch main body and operating grip, and Switch main body is located in the oil tank of transformer (6), and operating grip is located at the outside of oil tank of transformer (6).

3. compact oil-filled transformer according to claim 1 and 2 is characterized in that described protection switch adopts magnetic to keep cut-off device load protection switch (1).

4. compact oil-filled transformer according to claim 3 is characterized in that also being connected with the reserve current limiting fuse between high-pressure side sleeve pipe and protection switch.

5. compact oil-filled transformer according to claim 3 is characterized in that at step down side 0 zero-sequence transformer (4) that is used to monitor the transformer zero-sequence current being housed mutually.

6. compact oil-filled transformer according to claim 3 is characterized in that described high-pressure side sleeve pipe adopts high-pressure side cable connect-disconnect plug (2).