CN2545683Y - Three-phase transformer - Google Patents
Three-phase transformer Download PDFInfo
- Publication number
- CN2545683Y CN2545683Y CN 02223911 CN02223911U CN2545683Y CN 2545683 Y CN2545683 Y CN 2545683Y CN 02223911 CN02223911 CN 02223911 CN 02223911 U CN02223911 U CN 02223911U CN 2545683 Y CN2545683 Y CN 2545683Y
- Authority
- CN
- China
- Prior art keywords
- iron core
- residual voltage
- control circuit
- main control
- secondary winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a three-phase transformer, comprising an iron core, a primary winding coiled around the iron core and three secondary windings. Three terminals of the primary winding are respectively connected with a low tension gird network and the A, B and C fire wire of a main control circuit. The utility model is characterized in that the utility model is also provided with a set of residual voltage pass filter coil, which is an assistant secondary winding that are connected with each other in series. The iron core is a pentastyle iron core. The assistant secondary windings are divided into two parts and coiled around two side column iron cores. The fourth terminal of the primary winding is connected with the low tension grid and the N wire of the main control circuit. When a phase failure fault happens to the grid network and the main control circuit, the two terminals of a residual voltage pass filter has residual voltage. An additional control proactive device for the residual voltage can cut off main switch supply power to prevent the equipments from burning off. Meanwhile, a maintainer can quickly and correctly remedy faults and the power can come back.
Description
Technical field
The utility model relate to three-phase transformer in the three-phase and four-line electric power system of a kind of 0.38KV of being applicable to (miniature, make the unit control transformer and use, down with).
Background technology
The three-phase transformer of prior art, comprise one three post unshakable in one's determination and a main winding (elementary winding) and three secondary winding on the three post iron cores, the mode of connection is that three terminals of elementary winding connect with electrical network (low pressure, down together) and three live wires of A, B, C of main control circuit respectively.When the electrical network and the main control circuit generation phase failure, all loads promptly move under phase failure state, and the phenomenon that burns out equipment happens occasionally; Simultaneously, the maintainer also can't recognize it is the fault of electrical network and main control circuit (master switch, together following) once, can not search the accident source fast pointedly and restore electricity, both cause unnecessary human and material resources, the loss of financial resources, and caused very big inconvenience for again production and life.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of three-phase transformer, when the electrical network and the main control circuit generation phase failure, it can cut off the power supply of electrical network and main control circuit immediately, to avoid burning out equipment, simultaneously, the maintainer also can fix a breakdown and restore electricity rapidly and accurately.
Technical solution of the present utility model is to increase by a cover residual voltage pass filter coil on the basis of existing three-phase transformer; The described five post iron cores that adopt unshakable in one's determination; Described elementary winding has also increased terminals that connect electrical network and total control circuit N (center) line.
Described residual voltage pass filter coil can be two auxiliary secondary winding of series connection mutually, and described auxiliary secondary winding can be divided into two sections on two side column iron cores.
After adopting above structure, the utility model three-phase transformer is owing to select for use five posts unshakable in one's determination and increase residual voltage pass filter power supply and skilful use low voltage electric network center (N) line, when the electrical network and the main control circuit phase failure (or disconnecting a bit), and residual voltage pass filter exit a
1And x
1Just there is certain voltage (as 220 volts) to produce, by being connected the control protective device (as trip gear) on electrical network and the main control circuit, just can cut off the power supply of electrical network and main control circuit immediately automatically, to avoid burning out equipment; Simultaneously, the maintainer also can head direct for electrical network and main control circuit, fix a breakdown rapidly and accurately and restore electricity, thereby avoided the loss of human and material resources, financial resources, for produce, life provides convenience.This three-phase transformer is simple in structure, and installation, maintenance is convenient.
Description of drawings
Fig. 1 is this three-phase transformer structural representation.
Fig. 2 is this three-phase transformer wiring schematic diagram.
Fig. 3 is the schematic diagram of auxiliary secondary winding on the side column iron core of this three-phase transformer.
Fig. 4 is the schematic diagram of auxiliary secondary winding on three main cores of this three-phase transformer.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As shown in Figure 1, this three-phase transformer comprises three closed post main cores 1, skeleton 2 and from inside to outside the elementary winding 3 outside main core 1, insulating barrier 4, level winding 5, insulating barrier 6, two level windings 7, insulating barrier 8, three secondary winding 9, external insulation layer 10 and cushion blocks 12, clamp a part 13, clamping screw 14, pad 15, spring shim 16, locking nut 17, a part 18, lock-screw 19, terminal block 20 and binding post 21, above these and all belong to prior art, so do not describe in detail.
This three-phase phase convertor is on the basis of above existing three-phase transformer, and unshakable in one's determination 1 adopts five closed post iron cores, promptly increases by two side column iron cores 1 on former three posts 1 both sides unshakable in one's determination.Also increased by cover residual voltage pass filter coil 11, i.e. two auxiliary secondary winding 11 of connecting mutually.Described auxiliary secondary winding 11 is divided into two sections on two side column iron cores 1.
As Fig. 2, shown in Figure 3, four terminals of the elementary winding of this three-phase transformer connect respectively on A, B, C live wire and N (zero) line of low voltage electric network and main control circuit (master switch) and (connect group: Y
o/ Y
o, Y, Y, Y,
); First, second and third secondary winding leading-out terminal connects signal, metering, control protection even load, i.e. a, b, c, N respectively
1Connect signal load, a ', b ', c ' connections metering load, (a ", b ", c ") connect control protection load, assist its leading-out terminal a after two windings in series of secondary winding for a , b c
1, x
1But external load (as connecing trip gear).
On the iron core 1 of closure, lay the auxiliary secondary winding 11 of laying mutual serial connection on 3,5,7,9, two side column iron cores 1 of primary and secondary winding on three main cores 1.As alternating voltage U
1Be added to elementary winding, alternating current I
1Flow into this winding and just produce the excitation effect, in iron core 1, produce alternating flux.This alternating flux is not only passed elementary winding 3, also passes secondary winding 5,7,9 simultaneously, and it causes induced electromotive force respectively in primary and secondary winding.If the load of secondary winding and external circuit is connected, just alternating current I is arranged
2Flow out, load terminal voltage is U
2, export electric energy in this way.Transformer is when normal operation, because the three-phase voltage in the electrical network is symmetrical, and the mutual balance of magnetic flux in 3 main cores 1, its vector sum is zero, so at residual voltage pass filter exit a
1And x
1The voltage of two-end-point is zero.When electrical network and main circuit generation open phase fault, produce the zero sequence magnetic flux on two side columns 1, form flux path through side column 1, and in auxiliary secondary winding 11, induce electromotive force, the size of the induced potential in each auxiliary secondary winding 11 is half of three times of residual voltages, i.e. 1.5U
0So the induced potential sum in two auxiliary secondary winding 11 is 3U
0, at the two-end-point a of residual voltage pass filter
1And x
1Residual voltage (220 volts) appears.
Referring to Fig. 4, described auxiliary secondary winding 11 also can be respectively on three main cores 1, and three auxiliary secondary winding 11 are connected in series mutually.But preferably on two side column iron cores 1.
Claims (2)
1, a kind of three-phase transformer, comprise iron core (1) and an elementary winding (3) and three secondary winding (5,7,9) on the iron core, three terminals of elementary winding connect A, B, the C live wire of electrical network and main control circuit respectively, it is characterized in that: it also comprises a cover residual voltage pass filter coil (11); Described iron core (1) is five post iron cores; The 4th terminals of elementary winding (3) connect the N line of electrical network and total control circuit.
2, three-phase transformer according to claim 1 is characterized in that: described residual voltage pass filter coil (11) is two auxiliary secondary winding of series connection mutually, and described auxiliary secondary winding is divided into two sections on two side column iron cores (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02223911 CN2545683Y (en) | 2002-04-20 | 2002-04-20 | Three-phase transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02223911 CN2545683Y (en) | 2002-04-20 | 2002-04-20 | Three-phase transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2545683Y true CN2545683Y (en) | 2003-04-16 |
Family
ID=33701474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02223911 Expired - Fee Related CN2545683Y (en) | 2002-04-20 | 2002-04-20 | Three-phase transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2545683Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360720A (en) * | 2011-06-01 | 2012-02-22 | 北京旺兴达电气设备有限公司 | Magnetic zero sequence filter |
-
2002
- 2002-04-20 CN CN 02223911 patent/CN2545683Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360720A (en) * | 2011-06-01 | 2012-02-22 | 北京旺兴达电气设备有限公司 | Magnetic zero sequence filter |
| CN102360720B (en) * | 2011-06-01 | 2013-10-16 | 北京旺兴达电气设备有限公司 | Magnetic zero sequence filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |