CN201812647U - Dry type grounding transformer - Google Patents
Dry type grounding transformer Download PDFInfo
- Publication number
- CN201812647U CN201812647U CN2010202931787U CN201020293178U CN201812647U CN 201812647 U CN201812647 U CN 201812647U CN 2010202931787 U CN2010202931787 U CN 2010202931787U CN 201020293178 U CN201020293178 U CN 201020293178U CN 201812647 U CN201812647 U CN 201812647U
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- iron core
- transformer
- dry
- secondary winding
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Abstract
The utility model discloses a dry type grounding transformer. The dry type grounding transformer comprises an iron core and a primary winding which compose a magnetic circuit; a neutral point for grounding is arranged on the primary side of the primary winding; the dry type grounding transformer further comprises a secondary winding; the primary winding and the secondary winding are concentrically sleeved on the iron core; and the primary winding is insulated from the secondary winding. On one hand, the secondary winding can be taken as the auxiliary power source of a transformer substation due to the continuous nominal capacity. On the other hand, the neutral point is arranged on the primary side by human and is used for compensating the current of a grounding capacitor and eliminating electric arcs produced at the grounding point when the primary side is grounded, so that the damage to the circuit and the equipment is effectively avoided, and fault current information is provided for an automatic protection device for isolating a faulty component in time.
Description
Technical field
The utility model relates to a kind of dry-type transformer, relates in particular to a kind of resin-cast thin insulating dry-type earth transformer.
Background technology
In the three-phase electrical power system of neutral point insulation, because isolated neutral, circuit and equipment are easy to because charge inducing suffers damage; And when single phase ground fault takes place, can produce indirect arc in this system,, then can cause the strong vibration of electromagnetic energy if there is not suitable device that this electric arc is extinguished rapidly, non-fault mutually and fault produce serious temporary overvoltage on mutually.
The utility model content
Technical problem to be solved in the utility model provides a kind of effectively protection circuit and equipment, and the dry-type earth transformer of the electric arc of can nipping in the bud.
For solving the problems of the technologies described above, the technical solution of the utility model is: dry-type earth transformer, comprise iron core and a winding that magnetic circuit is provided, the primary side of a described winding is provided with earthy neutral point, described dry-type earth transformer also comprises with a described winding and is enclosed within secondary winding on the iron core, a described winding and described secondary winding mutually insulated with one heart.
As a kind of optimized technical scheme, described neutral-point solid ground.
As a kind of optimized technical scheme, described neutral point is electrically connected arc suppression coil, described grounding through arc.
As a kind of optimized technical scheme, described neutral point is electrically connected resistor, described resistance-grounded system.
As a kind of optimized technical scheme, described iron core adopts the three-phase three-column heart type structure.
Owing to adopted technique scheme, dry-type earth transformer, comprise iron core and a winding that magnetic circuit is provided, the primary side of a described winding is provided with earthy neutral point, described dry-type earth transformer also comprises with a described winding and is enclosed within secondary winding on the iron core, a described winding and described secondary winding mutually insulated with one heart; On the one hand, because secondary winding has continuous rated capacity, can be used as the accessory power supply of transformer station; On the other hand, form artificial neutral point, when being used for primary side generation ground connection at primary side; the compensation of ground capacitance current is eliminated earth point electric arc, can effectively avoid the damage of circuit and equipment etc.; can also provide fault current information to automatic safety device, so that faulty component is in time isolated.
Description of drawings
Fig. 1 is the schematic diagram of the utility model embodiment iron core;
Fig. 2 is that the utility model embodiment iron core is along A-A direction view;
Fig. 3 is the coil sketch of the utility model embodiment first side winding;
Fig. 4 is the ZN winding diagram of the utility model embodiment first side winding;
Fig. 5 is the coiling outline drawing of the utility model embodiment secondary side winding;
Fig. 6 is the YN winding diagram of the utility model embodiment secondary side winding.
Embodiment
Below in conjunction with drawings and Examples, further set forth the utility model.Should be understood that these embodiment only to be used to the utility model is described and be not used in the restriction scope of the present utility model.Should be understood that in addition those skilled in the art can make various changes or modifications the utility model after the content of having read the utility model instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
A kind of dry-type earth transformer, comprise iron core and a winding that magnetic circuit is provided, described iron core adopts the three-phase three-column heart type structure, the primary side of a described winding is provided with earthy neutral point, neutral point can pass through several different methods ground connection, comprise direct ground connection, by grounding through arc with by resistance-grounded system, be that example describes with neutral point by grounding through arc in the present embodiment; Described dry-type earth transformer also comprises with a described winding and is enclosed within secondary winding on the iron core, a described winding and described secondary winding mutually insulated with one heart.
The transformer body is divided into iron core member, a winding (also claiming high-tension coil) and secondary winding (also claiming low-voltage coil) three big parts again by structure.Wherein iron core member comprises zero member such as iron core, folder, base and annex, and iron core constitutes the required magnetic circuit of electromagnetic induction, and folder bears gravity when iron core is clamped and hangs, and base bears whole gravity fixedlys connected with ground simultaneously; Winding and secondary winding are circuit parts of the present utility model, carry out voltage transformation, energy delivery according to the law of electromagnetic induction, and because the Z-shaped wiring of a winding can provide the artificial ground point when primary side ground connection.
Fig. 1 and Fig. 2 are the plane graph and the stack schematic diagrames of iron core of the present utility model, and what iron core adopted is the three-phase three-column heart type structure, easily manufactured with the solenoid coil of this structure matching, good stability during short circuit; 45 ° of full bias seams of stack process using, stem alternately overlaps ground with the part of iron yoke, and seam is alternately hidden, and is unique form of modern stack iron core, so joint form of the present utility model has improved the electromagnetic performance of iron core from magnetic structure; Core material is selected low-loss, high magnetic conduction for use, the cold-reduced silicon sheet of orientation is arranged, and purpose also is for the electromagnetic performance that improves iron core, reduces magnetic hysteresis and eddy current loss, thereby reaches energy-saving and cost-reducing and the final purpose of the stability of enhancing product performance.The clamping of iron core has multiple mode, and the stem clamping is taked not have the latitude adhesive tape with half-dried glass earlier and carried out several layers of colligation at a certain distance, and hot setting tightens up adhesive tape again, uses wooden fagging wedging iron core in addition between low-voltage coil and stem again; The clamping of iron yoke be use earlier, upper and lower iron yoke that lower clamping piece will be separately clamps at two ends, and then with upper clamping piece and lower clamping piece with drawing screw rod to strain.Whole iron core is equipped with trundle by base support on the base, can move around and 180 ° in rotation, greatly facilitate on-the-spot the installation.
Fig. 3 and Fig. 4 are the coil sketch of a winding of the present utility model and the winding diagram of first side winding.Winding and secondary winding are enclosed within on the iron core column with one heart, and keep enough insulation distances with secondary winding.Winding construction adopts the segmentation continous way in the cake formula, and the coil sketch shows a kind of typical coil number of turn and arranges that each coil has two sections, interior and the outer layering placement of air flue of air flue, skin has the tap section, is used to carry out the voltage adjustment, according to amount of capacity 3 taps or 5 taps can be set; For the number of turn of reinforced insulation end post cake is generally all lacked than the number of turn at middle part; Whole winding is symmetrical as far as possible in the axial direction, and magnetic field is evenly distributed vertically, can effectively reduce supplementary load loss like this, also can avoid axial electric power, noise and impedance to become big.The material selection dual-fiberglass wrapped flat copper wire of coil is no matter because copper all accounts for clear superiority than aluminium at aspects such as conductivity, mechanical strength, chemical characteristic and performance of technical process.The high pressure winding in coiling in external insulation and discontented circle line segment all use the filling of glass fiber strap, under vacuum state, use the poured with epoxy resin of import around intact back, solidify the back and form firm integral body, the mechanical strength height, partial discharge quantity is little, reliability is high, thin, the perfect heat-dissipating of interior outside resin insulating barrier, and winding is nonhygroscopic, even intermittent operation also need not go tide to handle.Three coils are formed three-phase, and every coil has two sections, only does the station when totally six sections coils can be realized normally moving by the wiring of ZN shape and uses with transformer; System provides artificial neutral point to link to each other with arc suppression coil during single-phase earthing, is grounded protection and fault current information is provided.
Fig. 5 and Fig. 6 are the coiling outline drawing of secondary winding of the present utility model and the winding diagram of secondary side winding.Secondary winding is enclosed within on the iron core column, keeps enough insulation distances with iron core; Winding construction adopts the drum type brake in the laminar, and the coiling outline drawing shows a kind of typical cylindrical layer winding structure, in the same side outlet, generally arranges two-layerly, and inside and outside layer and layer insulation all use DMD paper to twine, and use the epoxy resin end-blocking again around the curing of intact back.Because a Capacity Ratio secondary capacity is big, so the effective depth of secondary winding is littler than the height of a winding, has also utilized this imbalance just, ground connection change can carry out the impedance adjustment.The copper conductor sectional area of secondary winding is chosen according to the secondary capacity, because secondary winding has only normal operating condition, single phase ground fault takes place to its not influence.To form three-phase transformer equally and also need three secondary coils, because mostly secondary voltage is 400V, so connect the general YN of the employing mode of connection.Low-voltage lead will be drawn to overlap with user's copper bar by copper bar in addition.
In a word, the dry-type earth transformer of band secondary winding described in the utility model promptly can be as the station transformer; Can provide an artificial neutral point for isolated neutral system again; Have also simultaneously that loss is low, power savings good, economical operation, can be non-maintaining etc. advantage, its technical performance and operational reliability are all considerably beyond traditional grounding transformer.
The utility model is not limited to above-mentioned instantiation; every those skilled in the art are without performing creative labour; technical scheme from the foregoing description direct derivation goes out all will fall in the protection range of the present utility model, as remove trundle, change temperature controller etc.
Claims (5)
1. dry-type earth transformer, comprise iron core and a winding that magnetic circuit is provided, it is characterized in that: the primary side of a described winding is provided with earthy neutral point, described dry-type earth transformer also comprises with a described winding and is enclosed within secondary winding on the iron core, a described winding and described secondary winding mutually insulated with one heart.
2. dry-type earth transformer as claimed in claim 1 is characterized in that: described neutral-point solid ground.
3. dry-type earth transformer as claimed in claim 1 is characterized in that: described neutral point is electrically connected arc suppression coil, described grounding through arc.
4. dry-type earth transformer as claimed in claim 1 is characterized in that: described neutral point is electrically connected resistor, described resistance-grounded system.
5. as the described dry-type earth transformer of the arbitrary claim of claim 1 to 4, it is characterized in that: described iron core adopts the three-phase three-column heart type structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202931787U CN201812647U (en) | 2010-08-12 | 2010-08-12 | Dry type grounding transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202931787U CN201812647U (en) | 2010-08-12 | 2010-08-12 | Dry type grounding transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201812647U true CN201812647U (en) | 2011-04-27 |
Family
ID=43895586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202931787U Expired - Lifetime CN201812647U (en) | 2010-08-12 | 2010-08-12 | Dry type grounding transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201812647U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551776A (en) * | 2016-01-27 | 2016-05-04 | 丹东欣泰电气股份有限公司 | Novel resin cast dry-type grounding transformer |
| CN106877306A (en) * | 2017-03-08 | 2017-06-20 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Arc suppression coil of power distribution network distributed compensation device integrated with distribution transformer |
| CN107507698A (en) * | 2017-08-30 | 2017-12-22 | 杭州钱江电气集团股份有限公司 | A kind of transformer for suppressing function with D.C. magnetic biasing |
-
2010
- 2010-08-12 CN CN2010202931787U patent/CN201812647U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551776A (en) * | 2016-01-27 | 2016-05-04 | 丹东欣泰电气股份有限公司 | Novel resin cast dry-type grounding transformer |
| CN106877306A (en) * | 2017-03-08 | 2017-06-20 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Arc suppression coil of power distribution network distributed compensation device integrated with distribution transformer |
| CN106877306B (en) * | 2017-03-08 | 2020-05-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Distribution network arc suppression coil and distribution transformer integrated distributed compensation device |
| CN107507698A (en) * | 2017-08-30 | 2017-12-22 | 杭州钱江电气集团股份有限公司 | A kind of transformer for suppressing function with D.C. magnetic biasing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110427 |
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| CX01 | Expiry of patent term |