CN202648356U - Closed type circulating drying system for isolated phase enclosed bus - Google Patents
Closed type circulating drying system for isolated phase enclosed bus Download PDFInfo
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- CN202648356U CN202648356U CN 201220307163 CN201220307163U CN202648356U CN 202648356 U CN202648356 U CN 202648356U CN 201220307163 CN201220307163 CN 201220307163 CN 201220307163 U CN201220307163 U CN 201220307163U CN 202648356 U CN202648356 U CN 202648356U
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- phase
- drying device
- isolated
- enclosed busbar
- enclosed bus
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Abstract
The utility model discloses a closed type circulating drying system for an isolated phase enclosed bus. The enclosed bus comprises an A phase, a B phase and a C phase, wherein a drying device is communicated with the A phase, the B phase and the C phase, and an air circulating circuit is formed. Dry and hot wind is blown into the drying device through one or two phases of the enclosed bus and then enters the other two or one phase of the enclosed bus after passing the whole enclosed bus through a communicating pipe, and finally returns to the drying device along with moisture and dust. Moisture and dust in the wind is removed, and the wind is heated and then enters the next cycle. No drain hole is needed to be reserved on the enclosed bus, and good dehumidification effect can be achieved through the hot wind cycle of the drying device. The closed type circulating drying system for the isolated phase bus is low in maintenance cost and high in economical efficiency.
Description
Technical field
The utility model relates to power plant's wiring technique, refers in particular to a kind of closed circulating dry system of isolated-phase enclosed bus.
Background technology
In power plant electrical system; usually adopt enclosed busbar to be connected between station service transformer and the 6kV/10kV Medium Voltage Switchgear; enclosed busbar has the advantages such as safety, easy layout, easy care with respect to the open type bus; but when power plant meets when restarting after large light maintenance or fault cause that generator is long-time and shut down; reason owing to enclosed busbar sealing property and weather aspect; the enclosed busbar dielectric level problem on the low side that runs into when station service electrical system is recovered is to perplex for a long time each Coastal Thermal Power Plant, especially be located in the common difficulty of moist rainy foggy southern Coastal Thermal Power Plant.
Trace it to its cause; produce the problems referred to above and mainly be because; bus temperature is 75-83 ℃ when unit operation; skin temperature is 56-65 ℃; and during compressor emergency shutdown; bus and skin temperature fast-descending; maximum when the saturated water capacity of air is by normal operation between bus and the shell descends rapidly; cause having aqueous water to separate out between bus and shell; these separate out the insulation between water meeting heavy damage bus and the shell; when again starting shooting, over the ground flashover of enclosed busbar conductor occurs easily, easier generation during the strand weather of especially high salt fog high humility.
For solving the bus low problem of insulation of making moist, general way is that enclosed busbar inflation dehydrating unit is installed at present, and the dehumidification mode of three types is arranged usually:
1) in the female shell of envelope, leads to natural wind.The method that is characterized in is fairly simple, can comparatively fast solve the front lower problem of insulaion resistance of start.But the method can not solve the large problem of relative air humidity in the enclosed busbar shell, and when particularly surrounding enviroment humidity was very large, the relative humidity of natural air was also very large, needs logical very large air quantity could improve the enclosed busbar insulaion resistance.Passable as a kind of interim measure, but then advanced not enough as regular measure, long-term measurement is also uneconomical.
2) in the female shell of envelope, lead to hot blast.The method improves to some extent than logical natural wind, and the hot blast that passes into can be driven away a part of humid air, can also improve the saturated moisture content values of air, reduces relative humidity, makes the very fast raising of enclosed busbar dielectric level.But because bus and shell are aluminum, heat-transfer effect is good, and it is also fast to dispel the heat, so in case the situation of very fast temperature drop can appear in stopped heating or when far away apart from hot spot.Along with the reduction of temperature, airborne water vapour becomes aqueous water with regelation.
3) in the female shell of envelope, lead to the pressure-fired air.It is regularly to be filled with the dry air that filters in the enclosed busbar shell, and makes the female shell inner air pressure of envelope be slightly higher than external atmosphere pressure, and so extraneous humid air and dust just can not enter in the female shell of envelope, thereby guarantees the insulation of enclosed busbar.But this way is very high to the requirement of making and install, and must guarantee the air-tightness of the female shell of envelope, otherwise for keeping pressure, needs almost ceaselessly operation in 24 hours of air pump, not only takes electricity but also disturb others, and operating cost is very high, and moisture effect is also bad.
Although enclosed busbar adopts isolated-phase enclosed bus can solve to a certain extent the problem of protection against the tide, anti-condensation,, also the dewfall phenomenon can appear still.
Summary of the invention
The purpose of this utility model provides a kind of closed circulating dry system of isolated-phase enclosed bus, and it can overcome the defective of prior art, improves the phenomenon of the easy dewfall of enclosed busbar.
The purpose of this utility model is achieved in that
A kind of closed circulating dry system of isolated-phase enclosed bus, described enclosed busbar includes A phase, B phase, C phase three-phase, the closed circulating dry system of isolated-phase enclosed bus includes drying device, and described drying device reaches mutually C with A phase, B and is connected, and forms air circulation loop.
Described drying device is from wherein a phase or two-phase enclosed busbar are blown into dry hot blast, behind whole section enclosed busbar, by entering other two-phases or a phase enclosed busbar described communicating pipe, carry at last moisture, dust and return dehumidifying in the described drying device, heating, dedusting, enter again afterwards next circulation.
Among embodiment, the closed circulating dry system of isolated-phase enclosed bus also includes the PLC control device therein, and described PLC control device is connected with described drying device.
Control the operation of described drying device by the PLC control device, easy to operate, and reliable, after the successful installation, only need simple debugging (motor adjustment turn to etc.), just can put into operation.
Among embodiment, be provided with humidity sensing device in the shell of each mutually described enclosed busbar therein, described humidity sensing device is connected with described PLC control device.
By the humidity of air in the described humidity sensing device sensing enclosed busbar shell, to sense humidity wet during greater than the top limit of humidity that sets when it, and described PLC control device is just controlled described drying device operation; When it senses under the humidity that humidity drops to described setting in limited time, it is out of service that described PLC control device is controlled described drying device.
Among embodiment, an end of arbitrary phase enclosed busbar is communicated with the outlet of described drying device therein, and an end of two-phase enclosed busbar is communicated with the import of described drying device in addition, and the other end of three-phase enclosed busbar was communicated with by communicating pipe.
Among embodiment, appoint an end of two-phase enclosed busbar to be communicated with the outlet of described drying device therein, an end of an other phase enclosed busbar is communicated with the import of described drying device, and the other end of three-phase enclosed busbar was communicated with by communicating pipe.
Among embodiment, described drying device includes at least two absorbing cylinders therein.One of them absorbing cylinder plays suction-operated, and another absorbing cylinder then plays palingenesis, and absorption and the palingenesis of two absorbing cylinders changed (general conversion time is between 6-8 hour) mutually.
The utility model compared with prior art has following beneficial effect:
The closed circulating dry system of the utility model isolated-phase enclosed bus need not to reserve osculum again on enclosed busbar, replace traditional inflation dehydrating unit by drying device, play good effect on moisture extraction by hot air circulation, even has an effect of dedusting, maintenance cost is low, has higher economy.
By humidity sensing device is combined with the PLC control device, automatically control the start and stop of drying device, more can be when extreme climate or generating set be stopped transport for a long time the people not out of service for being set to, greatly reduce operating cost.
Description of drawings
Fig. 1 is the schematic diagram of the closed circulating dry system of the utility model isolated-phase enclosed bus;
Fig. 2 is the cutaway view of the closed circulating dry system of the utility model isolated-phase enclosed bus.
The specific embodiment
As shown in Figures 1 and 2, the closed circulating dry system of the utility model isolated-phase enclosed bus, it includes drying device 11, PLC control device 12, and described enclosed busbar includes A phase, B phase, C phase three-phase.Described drying device 11 is connected with described PLC control device 12, and described drying device reaches mutually C with A phase, B and is connected, and forms air circulation loop.
Wherein, a end that can preferred arbitrary phase enclosed busbar is communicated with the outlet of described drying device 11, and an end of two-phase enclosed busbar is communicated with the import of described drying device 11 in addition, and the other end of three-phase enclosed busbar was communicated with by communicating pipes 13.In the present embodiment, the outlet of preferred described drying device 11 is connected with the B of enclosed busbar, the import of described drying device 11 is connected with A phase, the C of described enclosed busbar, and the other end of the A phase of enclosed busbar, B phase, C phase then is communicated with by described communicating pipe 13.
Described drying device 11 is blown into dry hot blast mutually from B, through behind whole section the enclosed busbar, by drying device the air in the enclosed busbar is extracted out again, after the described drying device of process is removed moisture, return in the described enclosed busbar, thereby make the air in the enclosed busbar shell remain dry, reach good effect on moisture extraction, avoid the generation of dewfall phenomenon.After the closed circulating dry system operation of this isolated-phase enclosed bus, the dew point of the air in the enclosed busbar shell is remained on about-30 ℃.
In addition, be communicated with the outlet of described drying device after can also selecting to appoint an end of two-phase enclosed busbar to be communicated with, an end of an other phase enclosed busbar is communicated with the import of described drying device again, and the other end of three-phase enclosed busbar was communicated with by communicating pipe.Its operation principle is identical with above-mentioned connected mode, can reach goal of the invention of the present utility model equally.
The described drying device 11 of present embodiment is air drying equipment, and it includes two absorbing cylinders.One of them absorbing cylinder plays suction-operated, and another absorbing cylinder then plays palingenesis, and absorption and the palingenesis of two absorbing cylinders changed (general conversion time is between 6-8 hour) mutually.
The method of operation of the closed circulating dry system of this isolated-phase enclosed bus has two kinds, and a kind of is the automatic method of operation, is specially:
Be provided with humidity sensing device in the bus shell of enclosed busbar A phase, B phase, C phase, described humidity sensing device is connected with described PLC control device.In the present embodiment, described humidity sensing device is humidity sensor.
By the humidity of air in the described humidity sensing device sensing enclosed busbar shell, to sense humidity wet during greater than the top limit of humidity that sets when described humidity sensing device, and described PLC control device 12 is just controlled described drying device 11 operations; When described humidity sensing device senses under the humidity that humidity drops to described setting in limited time, the described drying device of described PLC control device 12 controls is out of service.
Another kind is the manual method of operation, and namely drying device can continuous operation, artificial switching, and when being applicable to unit starting, debugging and abnormal running, equipment will move continuously, and the air humidity in the bus shell can maintain very low state.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (6)
1. the closed circulating dry system of an isolated-phase enclosed bus, described enclosed busbar includes A phase, B phase, C phase three-phase, it is characterized in that it includes drying device, and described drying device reaches mutually C with A phase, B and is connected, and forms air circulation loop.
2. the closed circulating dry system of isolated-phase enclosed bus according to claim 1 is characterized in that, it also includes the PLC control device, and described PLC control device is connected with described drying device.
3. the closed circulating dry system of isolated-phase enclosed bus according to claim 2 is characterized in that, is provided with humidity sensing device in the shell of each mutually described enclosed busbar, and described humidity sensing device is connected with described PLC control device.
4. the closed circulating dry system of isolated-phase enclosed bus according to claim 1, it is characterized in that, one end of arbitrary phase enclosed busbar is communicated with the outlet of described drying device, an end of two-phase enclosed busbar is communicated with the import of described drying device in addition, and the other end of three-phase enclosed busbar was communicated with by communicating pipe.
5. the closed circulating dry system of isolated-phase enclosed bus according to claim 1, it is characterized in that, appoint an end of two-phase enclosed busbar to be communicated with the outlet of described drying device, one end of an other phase enclosed busbar is communicated with the import of described drying device, and the other end of three-phase enclosed busbar was communicated with by communicating pipe.
6. the closed circulating dry system of isolated-phase enclosed bus according to claim 1 is characterized in that, described drying device includes at least two absorbing cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220307163 CN202648356U (en) | 2012-06-28 | 2012-06-28 | Closed type circulating drying system for isolated phase enclosed bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220307163 CN202648356U (en) | 2012-06-28 | 2012-06-28 | Closed type circulating drying system for isolated phase enclosed bus |
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| Publication Number | Publication Date |
|---|---|
| CN202648356U true CN202648356U (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220307163 Expired - Fee Related CN202648356U (en) | 2012-06-28 | 2012-06-28 | Closed type circulating drying system for isolated phase enclosed bus |
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| CN (1) | CN202648356U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882837A (en) * | 2015-05-25 | 2015-09-02 | 镇江市高等专科学校 | Enclosed busbar micro-positive-pressure hot air maintenance apparatus |
-
2012
- 2012-06-28 CN CN 201220307163 patent/CN202648356U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882837A (en) * | 2015-05-25 | 2015-09-02 | 镇江市高等专科学校 | Enclosed busbar micro-positive-pressure hot air maintenance apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC Free format text: FORMER NAME: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Patentee after: Company limited of China Energy Engineering Group Guangdong Electric Power Design Institute Address before: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Patentee before: Guangdong Electric Power Design Institute of CEEC |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130102 Termination date: 20190628 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |