CN105071260A - Insulating property processing method for nuclear power station main transformer after overdue of onsite warehousing - Google Patents
Insulating property processing method for nuclear power station main transformer after overdue of onsite warehousing Download PDFInfo
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- CN105071260A CN105071260A CN201510497389.XA CN201510497389A CN105071260A CN 105071260 A CN105071260 A CN 105071260A CN 201510497389 A CN201510497389 A CN 201510497389A CN 105071260 A CN105071260 A CN 105071260A
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Abstract
The invention provides an insulating property processing method for a nuclear power station main transformer after overdue of onsite warehousing. The method comprises the steps that 1) the low-voltage winding of the main transformer is short-circuit by utilizing a short-circuit device, and low voltage is applied to the high-voltage winding of the main transformer via a test device so that low-frequency induction current is generated in the high-voltage winding and the low-voltage winding to heat transformer oil; 2) when temperature of transformer oil reaches the preset temperature, an oil filtering machine is started to perform external circulation on transformer oil so that moisture is taken out of the transformer body; and 3) after end of drying, residual magnetism of the main transformer is eliminated by adopting a demagnetization device. A mode of combination of heating of the windings of the main transformer and external circulation of transformer oil is adopted, and moisture in insulating material is enabled to be effectively precipitated out to transformer oil and then taken out of the external part of the transformer to be separated via external circulation of transformer oil so that insulating property of the nuclear power station main transformer is effectively improved and a major quality problem caused by the risk of insulating property of the main transformer is reduced.
Description
Technical field
The invention belongs to construction of nuclear power station field, more particularly, the present invention relates to a kind of nuclear power station main transformer field warehouse exceed the time limit after insulation property processing method.
Background technology
For nuclear power station main transformer, the quality of insulating material is very important, and moisture is the most important factor affecting its insulating material performance.
Because of construction of nuclear power station cycle characteristics, 3 months time limits that the storage cycle that main transformer arrives at scene specifies often beyond installation procedure, and need again between equipment installation period to continue interior inspection, inner installation etc. to main transformer, the device body long period can be caused to expose in atmosphere.As everyone knows, nuclear power projects is generally in coastal area, and ambient humidity is often greater than 85%, main transformer inner insulation material either way may be caused to make moist, thus cause its insulation property to be a greater impact therefore.
Carry out needing a large amount of expenses and time into stove drying process owing to main transformer entirety to be returned factory, therefore for the problem of making moist of nuclear power station main transformer inner insulation material, current published processing method carries out Circulation and Hot Oil Spray process to transformer, in particular cases improves insulation property by extending to vacuumize with the Circulation and Hot Oil Spray time.Refer to Fig. 1, Circulation and Hot Oil Spray process utilizes the transformer oil of oil filter 10 pairs of main transformer 20 inside to carry out heat cycles, thus take the moisture in main transformer 20 to transformer outside by transformer oil.But, at least there is following defect and deficiency in Circulation and Hot Oil Spray method, cause it not high to the improvement reliability of main transformer 20 insulation property: 1) during Circulation and Hot Oil Spray, for avoiding oil decomposition cracking, require that oil temperature is at 60-70 DEG C, oil filter heating oil temperature is no more than 75 DEG C, and outlet temperature is not less than 50 DEG C; This situation will cause the temperature of main transformer insulating material lower, even may lower than temperature of oil in transformer, and the moisture therefore in insulating material cannot effectively be separated out; 2) Circulation and Hot Oil Spray is by transformer oil heat-insulating material, according to the Moisture Transfer Rule in transformer oil-insulating material, often causes the moisture in transformer oil to enter in insulating material; That is, although by the result that transformer oil is chemically examined, scene judges that main transformer 20 is dry qualified, there is larger hidden danger because moisture in insulating material increases in the insulation property of main transformer 20.Visible, because measuring means and the principle that dewaters exist limiting, Circulation and Hot Oil Spray method can not make the insulation property of main transformer 20 effectively be improved.
In view of this, necessaryly a kind of nuclear power station main transformer field warehouse that can effectively improve is provided to exceed the time limit the processing method of insulation property.
Summary of the invention
The object of the invention is to: the insulation property processing method after providing a kind of nuclear power station main transformer field warehouse to exceed the time limit, effectively to improve the insulation property of nuclear power station main transformer.
To achieve these goals, the invention provides a kind of nuclear power station main transformer field warehouse exceed the time limit after insulation property processing method, it comprises the following steps:
1) utilize short-circuiting means by the low pressure short circuit in winding of main transformer, and apply low-voltage by experimental rig at the high pressure winding of main transformer, thus produce low frequency induction electric current to heat transformer oil at high-low pressure winding;
2) when the temperature of transformer oil reaches predetermined temperature, start oil filter and outer circulation is carried out to transformer oil, utilize transformer oil to be taken out of by moisture and be separated to transformer outside;
3), after drying terminates, degaussing gear is adopted to eliminate the remanent magnetism of main transformer.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, described step 1) when transformer oil is heated, also to start the Inner eycle that main transformer oil pump carries out transformer oil, to ensure transformer oil homogeneous heating.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, described step 2) in the predetermined temperature of transformer oil between 70 ~ 75 DEG C.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, described step 2) in the temperature of transformer oil refer to main transformer top layer oil surface temperature.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, described step 2) middle oil filter duration of work, the transformer oil of section to main transformer medium position samples with the water content in Transformer Oil Analysis at regular intervals, and read the water rate data of oil filter, as judging the whether dry qualified parameter of main transformer.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, the dry qualified criterion of described main transformer is, the running time of oil filter has reached minimum drying time, and the water rate difference of the water content of main transformer medium position transformer oil and last twice of oil filter has reached pre-provisioning request all.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, the minimum drying time that described oil filter runs is 12 hours, the pre-provisioning request of water content of main transformer medium position oil is for being less than 10mg/L, and the pre-provisioning request of water rate difference that oil filter is last twice is for being not more than 0.5mg/L.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, and described experimental rig comprises switch cubicle, phase shifting transformer, variable frequency power supply and control device; Switch cubicle is powered by outside three phase mains, phase shifting transformer is connected between switch cubicle and variable frequency power supply, variable frequency power supply is provided with the output for outside out-put supply, control device is connected with switch cubicle and is powered by switch cubicle, and control device is connected with variable frequency power supply and regulates the out-put supply of variable frequency power supply.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, during described experimental rig work, the three phase mains inputted by outside is distributed by switch cubicle: three phase mains is sent to phase shifting transformer boosting in a road, then through low-frequency sinusoidal AC power supply that variable frequency power supply output voltage frequency is adjustable; Single phase poaer supply is sent to control device in another road, realizes the power supply of control device.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, described control device is also provided with an oil temperature input, oil temperature input is connected with the oil temperature output of nuclear power station main transformer, the temperature of control device to transformer oil is monitored, and regulates according to the out-put supply of variations in temperature to variable frequency power supply of transformer oil.
The one of the insulation property processing method after exceeding the time limit as nuclear power station main transformer field warehouse of the present invention is improved, described control device is also provided with an oil filter control end, oil filter control end is connected with oil filter, and control device can be controlled the operation of oil filter.
Known by describing above, present invention employs main transformer winding and heat the mode combined with transformer oil outer circulation, water effective in insulating material is separated out in transformer oil, by the outer circulation of transformer oil moisture taken out of again and be separated to transformer outside, thus effectively improve the insulation property of nuclear power station main transformer, reduce the great quality problems that main transformer insulation property risk is brought.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the insulation property processing method after exceeding the time limit to nuclear power station main transformer field warehouse of the present invention and Advantageous Effects thereof are described in detail, wherein:
Fig. 1 is the syndeton schematic diagram of published Circulation and Hot Oil Spray processing method;
Fig. 2 is the syndeton schematic diagram of the insulation property processing method after nuclear power station main transformer field warehouse of the present invention exceeds the time limit;
Fig. 3 is the structural representation of experimental rig in Fig. 2.
Embodiment
In order to make, object of the present invention, technical scheme and Advantageous Effects are more clear to be understood, below in conjunction with the drawings and specific embodiments, is further elaborated to the present invention.Should be understood that, the embodiment described in this specification is only used to explain the present invention, is not to limit the present invention.
Refer to Fig. 2 and Fig. 3, the present invention adopts experimental rig 50, and cooperation oil filter 60, short-circuiting means 30 carry out drying to the insulating material of nuclear power station main transformer 40 together.
Experimental rig 50 comprises switch cubicle 52, phase shifting transformer 54, variable frequency power supply 56, control device 58 and relevant various connecting lines.Switch cubicle 52 is powered by outside three phase mains; Phase shifting transformer 54 is connected between switch cubicle 52 and variable frequency power supply 56; Variable frequency power supply 56 is provided with the output 560 for outside out-put supply.Control device 58 is connected with switch cubicle 52 and is powered by switch cubicle 52.Control device 58 is connected with variable frequency power supply 56 and regulates (about frequency range 0.1Hz) to its out-put supply, is also provided with an oil temperature input 580 and an oil filter control end 582.
When experimental rig 50 works, the three phase mains inputted by outside is distributed by switch cubicle 52: a road is sent three phase mains and boosted to phase shifting transformer 54, then through low-frequency sinusoidal AC power supply that variable frequency power supply 56 output voltage frequency is adjustable; Single phase poaer supply is sent to control device 58 in another road, realizes the power supply of control device 58.
Insulation property processing method after nuclear power station main transformer field warehouse of the present invention exceeds the time limit comprises the following steps:
1) preparation: utilize short-circuiting means 30 by low pressure winding 42 short circuit of main transformer 40; Be connected with high pressure winding 44 by the output 560 of experimental rig 50, oil temperature input 580 is connected with the oil temperature output of main transformer 40, and oil filter control end 582 is connected with oil filter 60;
2) heating is started: the switch opening the switch cubicle 52 of experimental rig 50, variable frequency power supply 56 pairs of high pressure windings 44 are made to apply low-voltage, thus in high-low pressure winding 44,42, produce low frequency induction electric current and the transformer oil in main transformer 40 is heated, simultaneously, the oil pump manually booting main transformer 40 carries out the Inner eycle of transformer oil, ensures homogeneous heating; In heating process, control device 58 pairs of main transformer 40 top layer oil surface temperatures are monitored, and regulate according to the out-put supply of variations in temperature to variable frequency power supply 56 of transformer oil;
3) drying is continued: when main transformer top layer oil surface temperature reaches predetermined temperature, control device 58 starts the outer circulation that oil filter 60 starts transformer oil, utilizes transformer oil to be taken out of by moisture and is separated to transformer outside; In this process, the out-put supply of control device 58 pairs of variable frequency power supplys 56 regulates, and makes the temperature of nuclear power station main transformer 40 top layer pasta maintain predetermined temperature; Described predetermined temperature is 70 ~ 75 DEG C, is preferably 70 DEG C; At oil filter 60 duration of work, sampling every 3 hours transformer oil to transformer medium position, with the water content in Transformer Oil Analysis, and reading the water rate data of oil filter, as judging the whether dry qualified parameter of main transformer;
4) dry end: reached minimum drying time (being generally 12 hours) when the running time of oil filter 60, and the water content of the main transformer medium position transformer oil recorded is less than 10mg/L, when simultaneously the oil filter 60 water rate difference of last twice is not more than 0.5mg/L (being preferably not more than 0.3mg/L), namely it is dry qualified to be judged as, stops the work of oil filter 60;
5) demagnetization: after drying terminates, remove short-circuiting means 30, high pressure winding 44 two ends of main transformer 40 are connected and is switched to degaussing gear (because degaussing gear is the off-the-shelf on market, no longer its mechanism and usage are described in detail herein) on, start degaussing gear and automatically carry out demagnetization, at the end of demagnetization, degaussing gear is by automatically out of service and show demagnetization and terminate; The remanent magnetism adopting degaussing gear to eliminate main transformer 40 is the quality risk caused to reduce remanent magnetism.
Known by describing above, present invention employs main transformer 40 winding and heat the mode combined with transformer oil outer circulation, water effective in insulating material is separated out in transformer oil, by the outer circulation of transformer oil moisture taken out of again and be separated to transformer outside, thus effectively improve the insulation property of nuclear power station main transformer 40, reduce the great quality problems that main transformer 40 insulation property risk is brought.
Compared with prior art, nuclear power station main transformer field warehouse of the present invention exceed the time limit after insulation property processing method at least have the following advantages:
1) utilize winding mode of heating, make heat be delivered to insulating material by high-low pressure winding 44,42, then be delivered to transformer oil and it be heated to suitable temperature; Because this process can ensure the temperature of temperature higher than transformer oil of insulating material, the moisture in insulating material is therefore made to move in transformer oil and effectively separate out;
2) controlled the compounding practice of oil filter 60 by methods such as the water rate mensuration of the moisture determination in each stage transformer oil, oil filter 60, effectively the moisture in transformer oil is discharged main transformer 40 body;
3) combination demagnetization process after process, effectively improves winding and heats the remanent magnetism risk brought.
According to above-mentioned principle, the present invention can also carry out suitable change and amendment to above-mentioned execution mode.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (11)
1. nuclear power station main transformer field warehouse exceed the time limit after an insulation property processing method, it is characterized in that, comprise the following steps:
1) utilize short-circuiting means by the low pressure short circuit in winding of main transformer, and apply low-voltage by experimental rig at the high pressure winding of main transformer, thus produce low frequency induction electric current to heat transformer oil at high-low pressure winding;
2) when the temperature of transformer oil reaches predetermined temperature, start oil filter and outer circulation is carried out to transformer oil, utilize transformer oil to be taken out of by moisture and be separated to transformer outside;
3), after drying terminates, degaussing gear is adopted to eliminate the remanent magnetism of main transformer.
2. nuclear power station main transformer field warehouse according to claim 1 exceed the time limit after insulation property processing method, it is characterized in that: described step 1) when transformer oil is heated, also to start the Inner eycle that main transformer oil pump carries out transformer oil, to ensure transformer oil homogeneous heating.
3. nuclear power station main transformer field warehouse according to claim 1 exceed the time limit after insulation property processing method, it is characterized in that: described step 2) in the predetermined temperature of transformer oil between 70 ~ 75 DEG C.
4. nuclear power station main transformer field warehouse according to claim 1 exceed the time limit after insulation property processing method, it is characterized in that: described step 2) in the temperature of transformer oil refer to main transformer top layer oil surface temperature.
5. nuclear power station main transformer field warehouse according to claim 1 exceed the time limit after insulation property processing method, it is characterized in that: described step 2) middle oil filter duration of work, the transformer oil of section to main transformer medium position samples with the water content in Transformer Oil Analysis at regular intervals, and read the water rate data of oil filter, as judging the whether dry qualified parameter of main transformer.
6. nuclear power station main transformer field warehouse according to claim 5 exceed the time limit after insulation property processing method, it is characterized in that: the dry qualified criterion of described main transformer is, the running time of oil filter has reached minimum drying time, and the water rate difference of the water content of main transformer medium position transformer oil and last twice of oil filter has reached pre-provisioning request all.
7. nuclear power station main transformer field warehouse according to claim 6 exceed the time limit after insulation property processing method, it is characterized in that: the minimum drying time that described oil filter runs is 12 hours, the pre-provisioning request of water content of main transformer medium position oil is for being less than 10mg/L, and the pre-provisioning request of water rate difference that oil filter is last twice is for being not more than 0.5mg/L.
8. nuclear power station main transformer field warehouse according to any one of claim 1 to 7 exceed the time limit after insulation property processing method, it is characterized in that: described experimental rig comprises switch cubicle, phase shifting transformer, variable frequency power supply and control device; Switch cubicle is powered by outside three phase mains, phase shifting transformer is connected between switch cubicle and variable frequency power supply, variable frequency power supply is provided with the output for outside out-put supply, control device is connected with switch cubicle and is powered by switch cubicle, and control device is connected with variable frequency power supply and regulates the out-put supply of variable frequency power supply.
9. nuclear power station main transformer field warehouse according to claim 8 exceed the time limit after insulation property processing method, it is characterized in that: during described experimental rig work, the three phase mains inputted by outside is distributed by switch cubicle: three phase mains is sent to phase shifting transformer boosting in a road, then through low-frequency sinusoidal AC power supply that variable frequency power supply output voltage frequency is adjustable; Single phase poaer supply is sent to control device in another road, realizes the power supply of control device.
10. nuclear power station main transformer field warehouse according to claim 8 exceed the time limit after insulation property processing method, it is characterized in that: described control device is also provided with an oil temperature input, oil temperature input is connected with the oil temperature output of nuclear power station main transformer, the temperature of control device to transformer oil is monitored, and regulates according to the out-put supply of variations in temperature to variable frequency power supply of transformer oil.
Insulation property processing method after 11. nuclear power station main transformer field warehouse according to claim 9 exceed the time limit, it is characterized in that: described control device is also provided with an oil filter control end, oil filter control end is connected with oil filter, and control device can be controlled the operation of oil filter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705573A (en) * | 2016-12-01 | 2017-05-24 | 山东电力设备有限公司 | Device for on-site treatment of transformer body affected with damp |
| CN109061402A (en) * | 2018-04-17 | 2018-12-21 | 国网浙江省电力有限公司电力科学研究院 | Transformer oil paper insulation performance based on FDS on-line testing charges restoration methods |
| CN112986730A (en) * | 2021-02-08 | 2021-06-18 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | Distribution transformer handover test movable detection device suitable for extremely cold environment |
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| SU671664A1 (en) * | 1977-01-14 | 1980-08-15 | Предприятие П/Я М-5111 | Tethod of diying silid insulation of electric machines and apparatus |
| CN103680912A (en) * | 2013-12-24 | 2014-03-26 | 天威保变（秦皇岛）变压器有限公司 | Post processing technology of transformer products |
| CN203747660U (en) * | 2014-03-19 | 2014-07-30 | 国家电网公司 | Sinusoidal wave modulation-based large-scale power transformer low-frequency heating device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU671664A1 (en) * | 1977-01-14 | 1980-08-15 | Предприятие П/Я М-5111 | Tethod of diying silid insulation of electric machines and apparatus |
| CN103680912A (en) * | 2013-12-24 | 2014-03-26 | 天威保变（秦皇岛）变压器有限公司 | Post processing technology of transformer products |
| CN203747660U (en) * | 2014-03-19 | 2014-07-30 | 国家电网公司 | Sinusoidal wave modulation-based large-scale power transformer low-frequency heating device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705573A (en) * | 2016-12-01 | 2017-05-24 | 山东电力设备有限公司 | Device for on-site treatment of transformer body affected with damp |
| CN109061402A (en) * | 2018-04-17 | 2018-12-21 | 国网浙江省电力有限公司电力科学研究院 | Transformer oil paper insulation performance based on FDS on-line testing charges restoration methods |
| CN109061402B (en) * | 2018-04-17 | 2020-12-18 | 国网浙江省电力有限公司电力科学研究院 | Electrified recovery method for insulation performance of transformer oiled paper based on FDS online test |
| CN112986730A (en) * | 2021-02-08 | 2021-06-18 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | Distribution transformer handover test movable detection device suitable for extremely cold environment |
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Application publication date: 20151118 |