CN107703797A - Oil stream flow velocity disturbance electric field simulator and its emulation mode inside a kind of main transformer - Google Patents
Oil stream flow velocity disturbance electric field simulator and its emulation mode inside a kind of main transformer Download PDFInfo
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- CN107703797A CN107703797A CN201710872860.8A CN201710872860A CN107703797A CN 107703797 A CN107703797 A CN 107703797A CN 201710872860 A CN201710872860 A CN 201710872860A CN 107703797 A CN107703797 A CN 107703797A
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- field intensity
- main transformer
- oil
- flow velocity
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The present invention relates to oil stream flow velocity disturbance electric field simulator inside a kind of main transformer and its emulation mode, simulator to include temperature sensor, field intensity probe, flow velocity test probe, AD signal adapters, control module, data memory module, frequency conversion oil circulating pump and pressure regulator；Temperature sensor, field intensity probe and flow velocity test probe transmit the data-signal of detection to AD signal adapters by fiber-optic signal line respectively, AD signal adapters, data memory module, frequency conversion oil circulating pump and pressure regulator are connected with the control module respectively, when the electric-field intensity of field intensity probe detection exceedes preset value, control module sends alarm signal and adjusts frequency conversion oil circulating pump rotating speed, and data memory module automatically saves the oil temperature, electric-field intensity, the flow velocity and flow of recycle oil of main transformer.The present invention makes main transformer all the time both can guarantee that safety, and the optimal circulating cooling mode that and can takes into account cooling effect is run, and main transformer safety, economical operation effect is greatly improved.
Description
Technical field
The present invention relates to oil stream flow velocity disturbance electric field simulator inside transformer technology field, more particularly to a kind of main transformer
And its emulation mode.
Background technology
In operation, its circulation of oil flow flow velocity and the bigger cooling effect of circular flow are better for main transformer, and it is to try hard to keep to cool down
Main transformer safe operation is demonstrate,proved, the Reliable guarantee of main transformer operation effect is improved, existing traditional main transformer circulation of oil flow cooling, is divided into natural epidemic disaster in booth
The strong oily circulating cooling of poor circulation of oil flow cooling and fixed flow rate flow runs both modes.
For the main transformer of natural temperature differential circulation of oil flow cooling, cooling effect is very poor, it is necessary to install radiating by excessive increase
Device quantity, increase area of dissipation, increase main transformer equipment volume, increase cooling oil amount require to meet to cool down, even if so, leaning on
Its cooling effect of the main transformer of natural temperature differential circulation of oil flow cooling also can not show a candle to the strong hydronic main transformer of oil.
Existing tradition is equipped with the main transformer of oil-immersed pump, is hydronic with the strong oil of fixed flow rate flow progress, although greatly carrying
High cooling efficiency, but be installed on the winding inside main transformer, iron core, high-voltage connection, pigtail splice etc. be powered run when can be at it
Around produce strong electromagnetic field, voltage class is higher, distance is closer to and metal material geometry is more sharp, its week
Enclose that electric field is stronger, the oil stream circulated can disturb the change of main transformer built-in field, and oil stream flow velocity is faster, oil stream water content
It is bigger, oil temperature is higher, or entrained air bubbles etc. in oil stream, bigger disturbing influence all can be more produced to main transformer internal electric field, works as master
When change internal electric field disturbance exceedes certain value, easily at the position that main transformer built-in electrical insulation is weak or metal material geometry is sharp
Electric discharge and superheating phenomenon are produced, so as to seriously jeopardize main transformer safe operation.Because winding, high-voltage connection, lead connect inside main transformer
First-class is all to have manufactured mounted, and therefore, normal operation main transformer its voltage, oil stream flow velocity and oil temperature under certain load are exactly
The principal element of electric field perturbations is impacted, current traditional main transformer can not disturb situation according to its internal electric field and carry out optimal follow
Ring cools down the control operation of oil stream flow velocity and flow, but carries out strong oily circulating cooling operation all the time with fixed flow rate flow,
And also jerk be present and suddenly open phenomenon, which greatly limits cooling effect, can not play the optimal of circulation oil stream cooling
Effect.
The content of the invention
In view of this, the present invention provides one kind can circulate oil stream flow velocity, flow and in the range of certain voltage according to cooling,
The device and method that disturbance main transformer internal electric field situation is tested, main transformer cooling circulation oil stream flow velocity is automatically controlled with optimal side
Formula is run, and both can guarantee that safety, and can takes into account cooling effect, and main transformer safety, economical operation effect is greatly improved.
To achieve the above object, the technical scheme is that：
Oil stream flow velocity disturbance electric field simulator inside a kind of main transformer, including the test of temperature sensor, field intensity probe, flow velocity are visited
Head, AD signal adapters, control module, data memory module, frequency conversion oil circulating pump and pressure regulator；The temperature sensor is used for
Detect the oil temperature of main transformer；The field intensity probe is used to detect main transformer internal electric intensity；The flow velocity test probe is installed on master
Become on the inwall near oil inlet, for detecting the flow velocity and flow of main transformer recycle oil；The frequency conversion oil circulating pump, for circulating
Oil stream inside main transformer；The output end of the pressure regulator is electrically connected with the input of main transformer low pressure winding, for adjusting main transformer height
Press the output voltage of winding；The temperature sensor, field intensity probe and flow velocity test probe lead to the data-signal of detection respectively
Fiber-optic signal line is crossed to transmit to the AD signal adapters, the AD signal adapters, data memory module, frequency conversion oil circulating pump
It is connected respectively with the control module with pressure regulator, when the electric-field intensity of field intensity probe detection exceedes preset value, control module
Send alarm signal and adjust frequency conversion oil circulating pump rotating speed, data memory module automatically saves the oil temperature of main transformer, electric-field intensity, followed
The flow velocity and flow of ring oil.
Further, the field intensity probe includes the first field intensity probe and the second field intensity probe, first field intensity probe
It is installed in the second field intensity probe on the inwall of main transformer housing, first field intensity probe is used to detect electric around main transformer winding
Field intensity, second field intensity probe are used to detect high-voltage connection surrounding electric field intensity.
Further, the field intensity probe is extension type.
Oil stream flow velocity disturbance electric field emulation mode inside a kind of main transformer based on said apparatus, comprises the following steps：
Step S1：Required according to l-G simulation test, adjust the length of the extension type field intensity probe inside main transformer；
Step S2：The frequency conversion oil circulating pump of main transformer is opened, circulation of oil flow cooling is carried out to main transformer；
Step S3：Slow stepping up from zero is carried out to main transformer by pressure regulator, until boosting to the voltage of simulation requirements；
Step S4：Frequency conversion oil circulating pump rotating speed is controlled, is continuously increased the flow velocity and flow of oil stream；
Step S5：When the electric-field intensity of field intensity probe detection exceedes preset value, control module sends alarm signal, data storage
Module automatically saves the oil temperature, electric-field intensity, the flow velocity and flow of recycle oil of current main transformer, while controls frequency conversion oil circulating pump to turn
Speed, reduce the flow velocity and flow of oil stream；
Step S6：When the electric-field intensity of field intensity probe detection is recovered to preset value, current frequency conversion oil circulating pump is kept to turn
Speed；
Step S7：Main transformer is slowly boosted by pressure regulator；
Step S8：When the electric-field intensity of field intensity probe detection exceedes preset value, control module sends alarm signal, data storage
Module automatically saves the oil temperature, electric-field intensity, the flow velocity and flow of recycle oil of current main transformer, stops boosting；
Step S9：Pressure regulator is slowly depressurized to zero, constantly reduces frequency conversion oil circulating pump rotating speed, until closing frequency conversion oil circulating pump；
Step S10：Test connection is removed, l-G simulation test terminates.
Further, the field intensity probe includes the first field intensity probe and the second field intensity probe, first field intensity probe
It is installed in the second field intensity probe on the inwall of main transformer housing, first field intensity probe is used to detect electric around main transformer winding
Field intensity, second field intensity probe are used to detect high-voltage connection surrounding electric field intensity.
Compared with prior art, the present invention has beneficial effect：Master can be automatically controlled according to the determination data of emulation mode
Become cooling recycle oil stream flow velocity to run in an optimal manner, when flow velocity up to may damage weakness insulation to disturbance electric field very much
When scope when, automatically controlling reduces frequency conversion oil circulating pump rotating speed, reduces flow velocity, when flow velocity be less than arranges value, automatic raising
Frequency conversion oil circulating pump rotating speed, increase cooling recycle oil flow rate, keeping main transformer, and can is taken into account cold all the time both can guarantee that safety
But the optimal circulating cooling mode of effect is run, and main transformer safety, economical operation effect is greatly improved.
Brief description of the drawings
Fig. 1 is oil stream flow velocity disturbance electric field simulator fundamental diagram inside main transformer of the present invention；
Fig. 2 is oil stream flow velocity disturbance electric field simulator control section block diagram inside main transformer of the present invention.
In figure：1st, main transformer body；2nd, iron core；3rd, low pressure winding；4th, high pressure winding；5th, high-voltage terminal；6th, low pressure inlet wire；7、
Low-voltage ground outlet；8th, temperature sensor；9th, the first field intensity probe；10th, the second field intensity probe；11st, flow velocity test probe；12、
Main transformer oil-out；13rd, circulation of oil flow pipe；14th, frequency conversion oil circulating pump import；15th, frequency conversion oil circulating pump；16th, main transformer oil inlet；
17th, fiber-optic signal line；18th, high-voltage earthing outlet；19th, transformer oil；20th, pressure regulator.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
As shown in figure 1, main transformer includes main transformer body 1, main transformer inside cored 2, low pressure winding 3, high pressure winding 4, low pressure
Inlet wire 6 and low-voltage ground outlet 7 are connected with low pressure winding 3, and high-voltage terminal 5 and high-voltage earthing outlet are led to from high pressure winding 4
18, there is transformer oil 19 inside main transformer.
Oil stream flow velocity disturbance electric field simulator inside a kind of main transformer, including temperature sensor 8, the first field intensity probe 9, the
Two field intensity probes 10, flow velocity test probe 11 and control section；Temperature sensor 8 is used for the oil temperature for detecting main transformer, installed in master
Become top；First field intensity probe 9 and the second field intensity probe 10 are installed on the inwall of main transformer housing；First field intensity probe 9 is used
In detection main transformer winding surrounding electric field intensity, near main transformer high pressure winding 4, the second field intensity probe 10 is used to detect high pressure
Lead surrounding electric field intensity, near main transformer winding high voltage outlet 5, the first field intensity probe 9 and the second field intensity probe 10 are
Extension type；Field intensity probe can also be transferred the files according to main transformer structure, the method for operation installed in diverse location, such as loaded switch
Near pigtail splice etc..
In the present embodiment, flow velocity test probe 11 is installed on the inwall near main transformer oil inlet 16, is become for detecting
The flow velocity and flow of depressor oil 19；Temperature sensor 8, the first field intensity probe 9, the second field intensity probe 10 and flow velocity test probe 11
The data-signal of detection is transmitted to control section by fiber-optic signal line 17 respectively；
Control section is as shown in Fig. 2 including alarm, AD signal adapters, control module, data memory module, AD signals turn
Parallel operation is connected with control module, when main transformer builtin voltage higher grade, oil stream flow velocity is bigger, distance it is nearer, to main transformer inside electricity
The influence of disturbance is bigger, as oil stream flow velocity constantly increases, is detected when the first field intensity probe 9 or the second field intensity probe 10
When electric-field intensity exceedes preset value, control module control alarm sends alarm signal and the data by being connected with control module are deposited
Storage module automatically saves the oil temperature, electric-field intensity, the flow velocity and flow of transformer oil 19 of current main transformer, and control module can be
PLC, or other suitable microcomputer chips, control section may be mounted in control room.
The device also includes frequency conversion oil circulating pump 15, and main transformer internal transformer oil 19 is circulated using circulation of oil flow pipe 13, cold
But master iron core 2, low pressure winding 3, high pressure winding 4, the purpose of main transformer safe operation is ensured, frequency conversion oil circulating pump 15 can be according to examination
Test requirement regulation flow velocity and flow.
The device also includes pressure regulator 20, and the output end of pressure regulator 20 is electrically connected with the input of main transformer low pressure winding 3,
For adjusting the output voltage of main transformer high pressure winding 4, under necessarily circulation oil stream flow velocity, the voltage of high pressure winding 4 is higher, and field strength is just
Bigger, electric field perturbations degree is also stronger.
Simulating experimental using above-mentioned simulator comprises the following steps：
Step S1：Required according to l-G simulation test, adjust the length of the first field intensity probe 9 and the second field intensity probe 10 inside main transformer
Degree；
Step S2：The frequency conversion oil circulating pump 15 of main transformer is opened, circulation of oil flow cooling is carried out to main transformer；
Step S3：Slow stepping up from zero is carried out to main transformer by pressure regulator 20, until boosting to the voltage of simulation requirements；
Step S4：The rotating speed of frequency conversion oil circulating pump 15 is controlled, is continuously increased the flow velocity and flow of transformer oil 19；
Step S5：When the electric-field intensity that the first field intensity probe 9 or the second field intensity probe 10 detect exceedes preset value, control module
Alarm signal is sent, data memory module automatically saves the oil temperature, electric-field intensity, the flow velocity and stream of transformer oil 19 of current main transformer
Amount, while the rotating speed of frequency conversion oil circulating pump 15 is controlled, reduce the flow velocity and flow of transformer oil 19；
Step S6：When the electric-field intensity that the first field intensity probe 9 or the second field intensity probe 10 detect is recovered to preset value, protect
Hold the current rotating speed of frequency conversion oil circulating pump 15；
Step S7：Main transformer is slowly boosted by pressure regulator 20；
Step S8：When the electric-field intensity that the first field intensity probe 9 or the second field intensity probe 10 detect exceedes preset value, control module
Alarm signal is sent, data memory module automatically saves the oil temperature, electric-field intensity, the flow velocity and stream of transformer oil 19 of current main transformer
Amount, stop boosting；
Step S9：Pressure regulator 20 is slowly depressurized to zero, constantly reduces the rotating speed of frequency conversion oil circulating pump 15, until closing frequency conversion recycle oil
Pump 15；
Step S10：Test connection is removed, l-G simulation test terminates.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, it should all belong to the covering scope of the present invention.
Claims (5)
1. oil stream flow velocity disturbance electric field simulator inside a kind of main transformer, it is characterised in that visited including temperature sensor, field strength
Head, flow velocity test probe, AD signal adapters, control module, data memory module, frequency conversion oil circulating pump and pressure regulator；It is described
Temperature sensor is used for the oil temperature for detecting main transformer；The field intensity probe is used to detect main transformer internal electric intensity；The flow velocity is surveyed
Probe header is installed on the inwall near main transformer oil inlet, for detecting the flow velocity and flow of main transformer recycle oil；The frequency conversion follows
Ring oil pump, for circulating oil stream inside main transformer；The output end of the pressure regulator is electrically connected with the input of main transformer low pressure winding,
For adjusting the output voltage of main transformer high pressure winding；The temperature sensor, field intensity probe and flow velocity test probe are by detection
Data-signal is transmitted to the AD signal adapters, the AD signal adapters, data storage mould by fiber-optic signal line respectively
Block, frequency conversion oil circulating pump and pressure regulator are connected with the control module respectively, when the electric-field intensity of field intensity probe detection exceedes in advance
If during value, control module sends alarm signal and adjusts frequency conversion oil circulating pump rotating speed, and data memory module automatically saves main transformer
Oil temperature, electric-field intensity, the flow velocity and flow of recycle oil.
2. oil stream flow velocity disturbance electric field simulator inside a kind of main transformer according to claim 1, it is characterised in that described
Field intensity probe includes the first field intensity probe and the second field intensity probe, and first field intensity probe and the second field intensity probe are installed in
On the inwall of main transformer housing, first field intensity probe is used to detect main transformer winding surrounding electric field intensity, and second field strength is visited
Head is used to detect high-voltage connection surrounding electric field intensity.
3. oil stream flow velocity disturbance electric field simulator inside a kind of main transformer according to claim 1, it is characterised in that described
Field intensity probe is extension type.
4. oil stream flow velocity disturbance electric field emulation mode inside a kind of main transformer based on claim 1, it is characterised in that including following
Step：
Step S1：Required according to l-G simulation test, adjust the length of the extension type field intensity probe inside main transformer；
Step S2：The frequency conversion oil circulating pump of main transformer is opened, circulation of oil flow cooling is carried out to main transformer；
Step S3：Slow stepping up from zero is carried out to main transformer by pressure regulator, until boosting to the voltage of simulation requirements；
Step S4：Frequency conversion oil circulating pump rotating speed is controlled, is continuously increased the flow velocity and flow of oil stream；
Step S5：When the electric-field intensity of field intensity probe detection exceedes preset value, control module sends alarm signal, data storage
Module automatically saves the oil temperature, electric-field intensity, the flow velocity and flow of recycle oil of current main transformer, while controls frequency conversion oil circulating pump to turn
Speed, reduce the flow velocity and flow of oil stream；
Step S6：When the electric-field intensity of field intensity probe detection is recovered to preset value, current frequency conversion oil circulating pump is kept to turn
Speed；
Step S7：Main transformer is slowly boosted by pressure regulator；
Step S8：When the electric-field intensity of field intensity probe detection exceedes preset value, control module sends alarm signal, data storage
Module automatically saves the oil temperature, electric-field intensity, the flow velocity and flow of recycle oil of current main transformer, stops boosting；
Step S9：Pressure regulator is slowly depressurized to zero, constantly reduces frequency conversion oil circulating pump rotating speed, until closing frequency conversion oil circulating pump；
Step S10：Test connection is removed, l-G simulation test terminates.
5. oil stream flow velocity disturbance electric field emulation mode inside a kind of main transformer according to claim 4, it is characterised in that described
Field intensity probe includes the first field intensity probe and the second field intensity probe, and first field intensity probe and the second field intensity probe are installed in
On the inwall of main transformer housing, first field intensity probe is used to detect main transformer winding surrounding electric field intensity, and second field strength is visited
Head is used to detect high-voltage connection surrounding electric field intensity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710872860.8A CN107703797B (en) | 2017-09-25 | 2017-09-25 | Oil stream flow velocity disturbance electric field simulator and its emulation mode inside a kind of main transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710872860.8A CN107703797B (en) | 2017-09-25 | 2017-09-25 | Oil stream flow velocity disturbance electric field simulator and its emulation mode inside a kind of main transformer |
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| Publication Number | Publication Date |
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| CN107703797A true CN107703797A (en) | 2018-02-16 |
| CN107703797B CN107703797B (en) | 2019-06-07 |
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| CN201710872860.8A Active CN107703797B (en) | 2017-09-25 | 2017-09-25 | Oil stream flow velocity disturbance electric field simulator and its emulation mode inside a kind of main transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749766A (en) * | 2005-10-28 | 2006-03-22 | 中国舰船研究设计中心 | Detector of Radar peak value field strength |
| CN106200545A (en) * | 2016-08-31 | 2016-12-07 | 中国长江电力股份有限公司 | Large-scale main transformer forced oil circulation water cooler water-flow signal, the processing method of oil stream signal |
| CN206223739U (en) * | 2016-09-18 | 2017-06-06 | 国网福建省电力有限公司 | Acid number intelligence rapid determination device in a kind of main change insulated paper |
| CN107144757A (en) * | 2017-07-01 | 2017-09-08 | 广东电网有限责任公司惠州供电局 | A kind of Buchholz relay oil stream flow velocity on-Line Monitor Device and method |
| CN207067271U (en) * | 2017-07-01 | 2018-03-02 | 广东电网有限责任公司惠州供电局 | A kind of Buchholz relay oil stream flow velocity on-Line Monitor Device |
-
2017
- 2017-09-25 CN CN201710872860.8A patent/CN107703797B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749766A (en) * | 2005-10-28 | 2006-03-22 | 中国舰船研究设计中心 | Detector of Radar peak value field strength |
| CN100412553C (en) * | 2005-10-28 | 2008-08-20 | 中国舰船研究设计中心 | Detector of Radar peak value field strength |
| CN106200545A (en) * | 2016-08-31 | 2016-12-07 | 中国长江电力股份有限公司 | Large-scale main transformer forced oil circulation water cooler water-flow signal, the processing method of oil stream signal |
| CN206223739U (en) * | 2016-09-18 | 2017-06-06 | 国网福建省电力有限公司 | Acid number intelligence rapid determination device in a kind of main change insulated paper |
| CN107144757A (en) * | 2017-07-01 | 2017-09-08 | 广东电网有限责任公司惠州供电局 | A kind of Buchholz relay oil stream flow velocity on-Line Monitor Device and method |
| CN207067271U (en) * | 2017-07-01 | 2018-03-02 | 广东电网有限责任公司惠州供电局 | A kind of Buchholz relay oil stream flow velocity on-Line Monitor Device |
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| CN107703797B (en) | 2019-06-07 |
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