CN203690095U - Three-level low frequency drying power source - Google Patents
Three-level low frequency drying power source Download PDFInfo
- Publication number
- CN203690095U CN203690095U CN201420082614.4U CN201420082614U CN203690095U CN 203690095 U CN203690095 U CN 203690095U CN 201420082614 U CN201420082614 U CN 201420082614U CN 203690095 U CN203690095 U CN 203690095U
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- China
- Prior art keywords
- bridge rectifier
- transformer
- rectifier module
- module
- low frequency
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- 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.)
- Expired - Lifetime
Links
- 238000001035 drying Methods 0.000 title abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 239000010949 copper Substances 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 11
- 238000009413 insulation Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000007791 dehumidification Methods 0.000 description 4
- 239000002274 desiccant Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The utility model provides a three-level low frequency drying power source. The three-level low frequency drying power source comprises a three-level inverter module, the input end of the three-level inverter module is connected with the output end of a first bridge rectifier module, the input end of the three-level inverter module is further connected with the output end of a second bridge rectifier module, the first bridge rectifier module is connected with the second bridge rectifier module in series, the input end of the first bridge rectifier module is connected with the input end of a transformer, the input end of the second bridge rectifier module is connected with 380-volt voltage, and the output end of the three-level inverter module is connected with the input end of a primary winding of the work transformer. The three-level inverter module heats the work transformer and insulates and heats a transformer body into the assigned temperature from the interior, and the effect of drying the transformer is achieved. Meanwhile, full-capacity output can be obtained only by using the half capacity of the transformer at the input end, equipment weight and cost can be reduced, equipment can be conveyed conveniently, and copper and steel consumption is reduced.
Description
Technical field
The utility model relates to a kind of three level low frequency dry power supplies, for three level low frequency dry power supplies of large oil immersed transformer drying dehumidifying.
Background technology
Low frequency dry power supply is mainly used in large oil immersed transformer drying dehumidifying, the safe operation that requires of insulating and being dried for voltage levels and jumbo transformer can be met, and extend its useful life, the desiccant dehumidification technology of transformer is a critical problem as far as possible.Existing dehumanization method and problem thereof:
1, traditional vacuumize dehumidifying technology: this is the most original desiccant dehumidification technology, vacuum tank heater is around taking air as heat-carrying agent, under atmospheric pressure, by transformer body or winding progressively a heat to 105 DEG C of left and right, then by hot conduction, heat is passed to inside.Because high voltage large capcity transformer is owing to having thicker insulating barrier, cause drying time very long, and also not thoroughly dry, be difficult to meet the requirement of transformer to insulation, so substantially eliminated by other method at present.
2, oil drying dehumidifying technology: oil drying dehumidifying technology adopts deep fat to carry out heating transformer as heat medium, because oil has higher specific heat, and can be good at permeating in the space of transformer, so the effect on moisture extraction of this desiccant dehumidification method is better than traditional vacuumize except wet method.Because these heating means are in heating process, before not yet evaporating, the moisture in insulating material carries out, have influence on the evaporation of moisture, therefore, drying time is also quite long.It is thinner and have the transformer of oil duct, low-voltage-grade that the method is relatively applicable to insulation, and the transformer thicker to insulation, electric pressure is higher should not use.
3, inductive loop desiccant dehumidification technology: this method is first to wrap the insulation materials such as asbestos in the case surface of vacuum tank or fuel tank itself, then heat-insulation layer outside around on the wire of the number of turn necessarily, it is powered.When passing into after alternating current, due to electromagnetic induction effect, by the magnetic flux that can induce alternation on tank wall, this magnetic flux can produce a kind of eddy current energy, produces heating effect.This heat transfer mode efficiency is low, and device body temperature raises comparatively slow.
Summary of the invention
The purpose of this utility model is to overcome the deficiency that prior art exists, and a kind of three level low frequency dry power supplies are provided.
The purpose of this utility model is achieved through the following technical solutions:
Three level low frequency dry power supplies, comprise three-level inverter module, the input of described three-level inverter module is connected with the output of the first bridge rectifier module, the input of described three-level inverter module is also connected with the output of the second bridge rectifier module, described the first bridge rectifier module and the second bridge rectifier module are in series, described first input of bridge rectifier module and the output of transformer are connected, the input of described the second bridge rectifier module is connected with 380V voltage, the output of described three-level inverter module is connected with the input of a winding of Working transformer.
Further, three above-mentioned level low frequency dry power supplies, described the first bridge rectifier module is made up of 6 diodes, and wherein diode is uncontrollable diode.
Further, three above-mentioned level low frequency dry power supplies, described the second bridge rectifier module is made up of 6 diodes, and wherein diode is uncontrollable diode.
Further, three above-mentioned level low frequency dry power supplies, the diode that the diode in described the first bridge rectifier module and the second bridge rectifier module is same model.
The substantive distinguishing features of technical solutions of the utility model and progressive being mainly reflected in:
The utility model is in the time of drying, by the secondary winding short circuit of Working transformer, a winding is applied to alternating voltage by heating power supply, make once, secondary winding current flowing, utilize the mode of winding and heating unshakable in one's determination to heat transformer, from inside, transformer body insulating is heated to the temperature of appointment, then through vacuumizing the moisture of taking away in the insulation of device body to reach the effect of dry transformer.Use the output voltage waveforms of three-level inverter module more stable, and can reduce harmonic content; Only adopt the capacity minimizing half of a transformer can obtain full capacity output, also can reduce weight and the cost of equipment, be convenient to equipment conveying, save the consumption of copper material and steel simultaneously.
Brief description of the drawings
Below in conjunction with accompanying drawing, technical solutions of the utility model are described further:
Fig. 1: circuit structure schematic diagram of the present utility model.
Embodiment
As shown in Figure 1, three level low frequency dry power supplies, comprise three-level inverter module 1, the input of three-level inverter module 1 is connected with the output of the first bridge rectifier module 2, the input of three-level inverter module 1 is also connected with the output of the second bridge rectifier module 3, the first bridge rectifier module 2 and the second bridge rectifier module 3 are in series, the input of the first bridge rectifier module 2 is connected with the output end of transformer 4, the input of the second bridge rectifier module 3 is connected with 380V voltage, the output of three-level inverter module 1 is connected with the input of a winding of Working transformer.
The first bridge rectifier module 2 is made up of 6 diodes, and wherein diode is uncontrollable diode; The second bridge rectifier module 3 is made up of 6 diodes, wherein diode is uncontrollable diode, and the diode that the diode in the first bridge rectifier module 2 and the second bridge rectifier module 3 is same model, ensures through the first bridge rectifier module 2, the voltage after the second bridge rectifier module 3 is identical.
Two uncontrollable the first bridge rectifier modules 2 and the second bridge rectifier module 3 are in series, be connected with the output of a transformer 4 at the input of the first bridge rectifier module 2 simultaneously, the input of transformer 4 is connected to 380V voltage, the power supply of the second bridge rectifier module 3 straight-through 380V is introduced directly among circuit, the capacity of the transformer in this device of use reduces half also can obtain full capacity output, and can reduce weight and the cost of equipment, be convenient to equipment conveying, save the consumption of copper material and steel.
When concrete application, after switching on by pressurization, input by the output of three-level inverter module 1 and a winding of Working transformer is connected, the output of the secondary winding of short circuit Working transformer simultaneously, make once, secondary winding current flowing, utilize the mode of winding and heating unshakable in one's determination to heat Working transformer, from inside, the insulation of Working transformer device body is heated to the temperature of appointment, then through vacuumizing the moisture of taking away in the insulation of device body to reach the effect of dry transformer.The method when heating heat is to produce from the inside of Working transformer insulation, therefore the efficiency of heating surface very high, consuming time short, effect on moisture extraction is remarkable.And when on-the-spot winding electrified heating, heating power can regulate with satisfied temperature needs by regulating primary side to add power supply voltage swing.
It is emphasized that: be only preferred embodiment of the present utility model above, not the utility model is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present utility model is done above embodiment, all still belong in the scope of technical solutions of the utility model.
Claims (4)
1. three level low frequency dry power supplies, it is characterized in that: comprise three-level inverter module, the input of described three-level inverter module is connected with the output of the first bridge rectifier module, the input of described three-level inverter module is also connected with the output of the second bridge rectifier module, described the first bridge rectifier module and the second bridge rectifier module are in series, described first input of bridge rectifier module and the output of transformer are connected, the input of described the second bridge rectifier module is connected with 380V voltage, the output of described three-level inverter module is connected with the input of a winding of Working transformer.
2. three level low frequency dry power supplies according to claim 1, is characterized in that: described the first bridge rectifier module is made up of 6 diodes, and wherein diode is uncontrollable diode.
3. three level low frequency dry power supplies according to claim 1, is characterized in that: described the second bridge rectifier module is made up of 6 diodes, and wherein diode is uncontrollable diode.
4. three level low frequency dry power supplies according to claim 1, is characterized in that: the diode that the diode in described the first bridge rectifier module and the second bridge rectifier module is same model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420082614.4U CN203690095U (en) | 2014-02-26 | 2014-02-26 | Three-level low frequency drying power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420082614.4U CN203690095U (en) | 2014-02-26 | 2014-02-26 | Three-level low frequency drying power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203690095U true CN203690095U (en) | 2014-07-02 |
Family
ID=51011969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420082614.4U Expired - Lifetime CN203690095U (en) | 2014-02-26 | 2014-02-26 | Three-level low frequency drying power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203690095U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841875A (en) * | 2017-03-01 | 2017-06-13 | 国家电网公司 | Three-Phase Distribution Transformers temperature rise test system and method based on alternating low frequency heating |
| CN108418440A (en) * | 2018-05-08 | 2018-08-17 | 国网电力科学研究院武汉南瑞有限责任公司 | The dual-purpose three level low frequency of list/three-phase dries power supply |
| CN109495989A (en) * | 2018-12-04 | 2019-03-19 | 国网辽宁省电力有限公司葫芦岛供电公司 | Transformer is from thermal drying device |
| CN109798737A (en) * | 2019-03-04 | 2019-05-24 | 广西电网有限责任公司南宁供电局 | A kind of transformer oil paper insulation dampness drying unit based on low-frequency current heating |
| WO2022267802A1 (en) * | 2021-06-24 | 2022-12-29 | 华能伊敏煤电有限责任公司 | Drying device and method for insulation damping treatment of large ampere-turns current transformer |
-
2014
- 2014-02-26 CN CN201420082614.4U patent/CN203690095U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841875A (en) * | 2017-03-01 | 2017-06-13 | 国家电网公司 | Three-Phase Distribution Transformers temperature rise test system and method based on alternating low frequency heating |
| CN106841875B (en) * | 2017-03-01 | 2024-05-03 | 国家电网公司 | Three-phase distribution transformer temperature rise test system and method based on alternating-current low-frequency heating |
| CN108418440A (en) * | 2018-05-08 | 2018-08-17 | 国网电力科学研究院武汉南瑞有限责任公司 | The dual-purpose three level low frequency of list/three-phase dries power supply |
| CN109495989A (en) * | 2018-12-04 | 2019-03-19 | 国网辽宁省电力有限公司葫芦岛供电公司 | Transformer is from thermal drying device |
| CN109495989B (en) * | 2018-12-04 | 2021-09-24 | 国网辽宁省电力有限公司葫芦岛供电公司 | Self-heating drying device for transformer |
| CN109798737A (en) * | 2019-03-04 | 2019-05-24 | 广西电网有限责任公司南宁供电局 | A kind of transformer oil paper insulation dampness drying unit based on low-frequency current heating |
| CN109798737B (en) * | 2019-03-04 | 2024-03-26 | 广西电网有限责任公司南宁供电局 | Transformer oil paper insulation drying device that wets based on low frequency current heating method |
| WO2022267802A1 (en) * | 2021-06-24 | 2022-12-29 | 华能伊敏煤电有限责任公司 | Drying device and method for insulation damping treatment of large ampere-turns current transformer |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |