CN104103409A - Converter transformer as well as site drying processing method and site drying processing equipment of converter transformer - Google Patents
Converter transformer as well as site drying processing method and site drying processing equipment of converter transformer Download PDFInfo
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- CN104103409A CN104103409A CN201410280951.9A CN201410280951A CN104103409A CN 104103409 A CN104103409 A CN 104103409A CN 201410280951 A CN201410280951 A CN 201410280951A CN 104103409 A CN104103409 A CN 104103409A
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Abstract
The invention discloses a converter transformer as well as a site drying processing method and site drying processing equipment of the converter transformer. The site drying processing method of the converter transformer comprises the steps of vacuumizing for 120 hours, injecting oil in vacuum for 24 hours, circulating hot oil for 24 hours, heating with large current while circulating hot oil for 24 hours, circulating hot oil for 36 hours after heating, standing for 120 hours and the like. Hot oil circulating processing for certain time and large current heating and hot oil circulating processing for certain time are performed after oil is injected into a converter transformer body; hot oil circulating for certain time is then performed, water content in transformer oil and an insulation assembly is drained timely, the water content in the oil accords with demands before the converter transformer is put into operation, the insulation resistance value meets the regulation demands, and the condition that the operation of the transformer is influenced due to precipitation of excessive water content while the converter transformer is operated is avoided.
Description
Technical field
The present invention relates to transformer technology field, particularly a kind of converter transformer and field drying processing method thereof and field drying treatment facility.
Background technology
At present, for the particularly installation of converter transformer of domestic high-power transformer, Oil feeding process and oil-filled after field drying process and all there is no a set of complete process.But converter transformer may be brought airborne moisture in sleeve pipe installation process, and after oil-filled, do not have reliable drying step to discharge by moisture in transformer oil and in insulation assembly.And important high-power transformer is installed the rear Circulation and Hot Oil Spray technological measure that only can carry out certain hour, and transformer does not take drying step just transformer to be put into operation after oil test is qualified, this cannot be avoided treating that operating transformer exists the risk of making moist, and then cause transformer to occur internal discharge in debugging or running, or even insulation breakdown.
The converter transformer that particularly large-sized DC power transmission engineering is used has the advantages that power is large, voltage is high, operating condition is complicated, and the moisture of transformer oil (being transformer insulation oil) and insulation assembly is had to very strict requirement.Therefore, study and be a set ofly necessary very much for the reliable and practical of converter transformer and the dry treatment process method that is easy to execute-in-place.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of converter transformer and field drying processing method thereof and field drying treatment facility, avoid causing insulation damages because making moist after converter transformer installation.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of converter transformer, it comprises converter transformer body, in described converter transformer body, be provided with net side winding and valve side winding, between converter transformer body and net side winding and valve side winding, be filled with transformer oil, on described converter transformer body, be provided with the conservator for extracting transformer oil out, described conservator is positioned at the top of converter transformer body.
In described converter transformer, on described converter transformer body, be provided with pouring orifice and oil-out, described pouring orifice and the oil-out diagonal position in converter transformer body, described pouring orifice is positioned at the bottom of converter transformer body, and oil-out is positioned at the top of mailbox.
In described converter transformer, on the lead-in wire of described net side winding, be provided with the first sleeve pipe, on the lead-in wire of described valve side winding, be provided with the second sleeve pipe.
A field drying processing method for above-mentioned converter transformer, it comprises:
A, converter transformer complete auxiliary install after, converter transformer body is vacuumized to 120 hours;
B, in converter transformer body, carry out vacuum oil 24 hours, make to be full of transformer oil in converter transformer body;
C, employing hot oil circulating device carry out Circulation and Hot Oil Spray processing at least 24 hours to described converter transformer body;
D, enter the large current flow heats device of ultralow frequency at net side winding side joint, and by valve side short circuit in winding, heat oil temperature by short-circuit method and make temperature of oil in transformer reach 60～70 DEG C to continue circulation 24 hours;
E, remove the large current flow heats device of described ultralow frequency, proceed Circulation and Hot Oil Spray and process 36 hours, make temperature of oil in transformer more than 50 DEG C;
F, remove hot oil circulating device, make that converter transformer body is quiet to be put 120 hours.
In described field drying processing method, described steps A also comprises: vacuumizing before timing, carry out leak rate test, guarantee that vacuum degree is in 100Pa, leak rate is in 30Pa.
In described field drying processing method, in step B, the oil injecting speed of vacuum oil is 4t/h-6t/h.
In described field drying processing method, described step C specifically comprises:
C1, employing hot oil circulating device carry out Circulation and Hot Oil Spray processing to described converter transformer body;
C2, in the time that reaching 50 DEG C, temperature of oil in transformer starts timing, and lasting Circulation and Hot Oil Spray 24 hours.
In described field drying processing method, the electric current of the large current flow heats device output of described ultralow frequency is 700-800A, and power frequency is 0.08-0.1Hz.
In described field drying processing method, in step C or D or E, reach after 50 DEG C in oil temperature, carried out megger test and the puncture voltage test of converter transformer body every 12 hours, and get transformer oil sample testing moisture content.
For a field drying treatment facility for the converter transformer to above-mentioned, it is characterized in that, comprising:
Vacuum extractor, for converter transformer body is vacuumized to processing, described vacuum extractor connects the conservator of converter transformer;
Hot oil circulating device, for in the time that vacuum extractor vacuumizes, flow into transformer oil to converter transformer body, and described converter transformer body is carried out to Circulation and Hot Oil Spray heat treated, one oil pipe line of described hot oil circulating device connects described pouring orifice, and another oil pipe line connects described oil-out;
The large current flow heats device of ultralow frequency, for exporting transformer oil described in the large current flow heats of ultralow frequency, the lead-in wire of the large current flow heats device of described ultralow frequency connection network side winding, and when the large current flow heats device work of ultralow frequency, adopt shorting stub by valve side winding short circuit;
Timer, for the operating time timing to the large current flow heats device of vacuum extractor, hot oil circulating device and ultralow frequency.
Compared to prior art, converter transformer provided by the invention and field drying processing method thereof and field drying treatment facility, in converter transformer body, after oiling, carry out the processing of certain hour Circulation and Hot Oil Spray, large current flow heats Circulation and Hot Oil Spray processing, then carry out again the Circulation and Hot Oil Spray of a period of time, can ensure that the moisture in transformer oil and insulating part assembly discharges in time, before guaranteeing that converter transformer puts into operation, Water in oil amount meets the requirements, insulating resistance value meets code requirement, ensure to there will not be excessive the separating out of moisture in the time that converter transformer moves and affect the situation of transformer operation.And the control of oil temperature has avoided transformer oil rotten, transformer oil and then still can use, because treatment measures are only carried out after fixing link, do not affect the installment work of converter transformer, in the control of cost and time, there is very large advantage, and do not introduce other any risk that affects change of current change operation.
Brief description of the drawings
Fig. 1 is the structured flowchart of converter transformer of the present invention.
Fig. 2 is the flow chart of the field drying processing method of converter transformer of the present invention.
Fig. 3 is the schematic diagram while carrying out vacuum oil in the field drying processing method of converter transformer of the present invention.
Fig. 4 carries out the schematic diagram of Circulation and Hot Oil Spray while processing in the field drying processing method of converter transformer of the present invention.
Fig. 5 carries out the schematic diagram of the large current flow heats of ultralow frequency while processing in the field drying processing method of converter transformer of the present invention.
Embodiment
The invention provides a kind of converter transformer and field drying processing method thereof and field drying treatment facility, relate to insulating oil in converter transformer Oil feeding process and after oil-filled and the dry treatment process of intraware, this technique can be discharged the moisture that converter transformer is invaded in installation process, ensure in Oil feeding process outside moisture not to be brought in insulating oil, and there is water content in the insulating oil of reduction, separate out the function of moisture in insulating part.
For making object of the present invention, technical scheme and effect clearer, clear and definite, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, its structured flowchart that is converter transformer of the present invention.As shown in Figure 1, converter transformer of the present invention comprises converter transformer body 10, in described converter transformer body 10, be provided with net side winding (visual angle of Fig. 1 is not shown) and valve side winding (visual angle of Fig. 1 is not shown), between converter transformer body 10 and net side winding and valve side winding, be filled with transformer oil (visual angle of Fig. 1 is not shown), on described converter transformer body 10, be provided with the conservator 20 for extracting transformer oil out, described conservator 20 is positioned at the top of converter transformer body 10.
Wherein, on described converter transformer body 10, be provided with pouring orifice 101 and oil-out 102, described pouring orifice 101 and the diagonal position of oil-out 102 in converter transformer body 10, described pouring orifice 101 is positioned at the bottom of converter transformer body 10, and oil-out 102 is positioned at the top of mailbox.Front taking converter transformer body 10 is rectangular as example, described pouring orifice 101 can be positioned at the position, the lower right corner (or lower left corner) of converter transformer body 10, described oil-out 102 can be positioned at the position, the lower left corner (or lower right corner) of converter transformer body 10, distribute taking diagonal as line of symmetry, make following carry out Circulation and Hot Oil Spray process time, transformer oil flows into from the bottom of converter transformer body 10, extract out and carry out heating hot oil circulating device from top, make transformer oil homogeneous heating.
Please again consult Fig. 1, on the lead-in wire of described net side winding, be provided with the first sleeve pipe 103, on the lead-in wire of described valve side winding, be provided with the second sleeve pipe 104, for the protection of the lead-in wire of net side winding and valve side winding.
The present invention is also corresponding to be provided a kind of and refers to Fig. 2 for above-mentioned converter transformer being carried out to the field drying processing method of field drying, and it comprises the following steps:
S100, converter transformer complete auxiliary install after, converter transformer body is vacuumized to 120 hours;
S200, in converter transformer body, carry out vacuum oil 24 hours, make to be full of transformer oil in converter transformer body;
S300, employing hot oil circulating device carry out Circulation and Hot Oil Spray processing at least 24 hours to described converter transformer body;
S400, enter the large current flow heats device of ultralow frequency at net side winding side joint, and by valve side short circuit in winding, heat oil temperature by short-circuit method and make temperature of oil in transformer reach 60～70 DEG C to continue circulation 24 hours;
S500, remove the large current flow heats device of described ultralow frequency, proceed Circulation and Hot Oil Spray and process 36 hours, make temperature of oil in transformer more than 50 DEG C;
S600, remove hot oil circulating device, make that converter transformer body is quiet to be put 120 hours.
The field drying processing method of converter transformer provided by the invention, can ensure that in oiling whole process not having moisture enters into transformer inside, guarantees that the converter transformer Water in oil amount before that puts into operation meets the requirements, and insulating resistance value meets code requirement.And the present invention avoided the rotten of insulating oil (being transformer oil) to the control of oil temperature, insulating oil and then still can use.In addition, field drying processing method of the present invention is only carried out after fixing link, do not affect the installment work of converter transformer, in the control of cost and time, there is very large advantage, and do not introduce other any risk that affects change of current change operation, ensured the safe and stable operation of converter transformer.
Wherein, in step S100, vacuumizing before timing, carry out leak rate test, guarantee that vacuum degree is in 100Pa, leak rate is in 30Pa.As shown in Figure 3, the pipeline of vacuum extractor is connected to conservator top, complete transformer install after continue to vacuumize until oiling finishes.In the process vacuumizing, carry out the test of leak rate, first converter transformer is evacuated to 100Pa left and right, then stop vacuumizing, after 1h is little, read MaLeod gauge value P1, excessively after 30min, read MaLeod gauge value P2, as residual voltage increment P2-P1≤30Pa, think that leak rate is qualified.Start afterwards timing, and maintain and vacuumize 120 hours.
Then, in vacuumizing, adopt hot oil circulating device (as vacuum oil-filter) in converter transformer body, to inject qualified transformer oil with the speed of 4-6t per hour, and continue 24 hours, fill the time and be as the criterion with actual.
Filling after oil, adopting hot oil circulating device to carry out Circulation and Hot Oil Spray processing to described converter transformer body, and starting timing in the time that upper strata oil temperature reaches 50 DEG C, and lasting Circulation and Hot Oil Spray 24 hours.Refer to Fig. 4, when hot oil circulating device carries out Circulation and Hot Oil Spray processing to converter transformer body, two pipelines of hot oil circulating device are connected to pouring orifice and oil-out, the mode (flow direction of oil is as shown in the arrow in Fig. 4) that the oily flow path direction that ensures converter transformer body is bottom in and top out, makes the oily homogeneous heating of converter transformer body.
In the present embodiment, because pouring orifice and oil-out position are symmetric along the diagonal of converter transformer body, therefore in circulating-heating processing procedure, also can open oil filter degassing tank and carry out degassed processing.When Circulation and Hot Oil Spray, in the time that the oil temperature of described oil-out is progressively warming up to 50 DEG C, start timing heating 24 hours.
Afterwards, adopt the large current flow heats device of ultralow frequency Access Network side winding side, and by valve side short circuit in winding, as shown in Figure 5, the large current flow heats device of described ultralow frequency output current frequency is that the electric current that 0.08-0.1Hz, size of current are 700-800A carries out large current flow heats, make oil temperature reach 60～70 DEG C, and continue circulation 24 hours.In this enforcement, the size of the large current flow heats device of ultralow frequency output current specifically should be depending on the oil temperature efficiency of heating surface, and object is that oil temperature is climbed between 60 DEG C～70 DEG C, but should not exceed 70 DEG C.The present invention adopts the large electric current of ultralow frequency to heat, and can reduce the induction reactance of converter transformer, thereby reduces hot oil circulating device output voltage and power loss.
After large current flow heats, remove the large current flow heats device of ultralow frequency and proceed Circulation and Hot Oil Spray processing 36 hours, ensure that the intrinsic oil temperature of converter transformer is more than 50 DEG C, this step claims again strengthening process, confirms that the moisture in transformer oil meets the demands.
Further, in the time carrying out Circulation and Hot Oil Spray processing, the large current flow heats processing of ultralow frequency and Circulation and Hot Oil Spray is processed again, reach after 50 DEG C in oil temperature, need carry out every 12 hours megger test and the puncture voltage test of converter transformer body main insulation, and get transformer oil sample testing moisture content, ensure that insulating resistance value meets the demands, water content continues to reduce and keep stable; Complete afterwards Circulation and Hot Oil Spray treatment process, enter quiet putting the stage, the commissioning test work of can being correlated with after the quiet 120h of putting.
The present invention adopts Circulation and Hot Oil Spray processing, the large current flow heats processing of ultralow frequency and the mode of Circulation and Hot Oil Spray processing again; because having the effect of condensed moisture, hot oil circulating device can guarantee that the moisture that converter transformer is invaded in installation process is discharged; Circulation and Hot Oil Spray under long-time high temperature can be by the water analysis of converter transformer built-in electrical insulation part out, ensures to there will not be excessive the separating out of moisture at converter transformer during in operation and the situation that affects transformer operation.
Converter transformer based on above-mentioned and its field drying processing method, the present invention also provides a kind of field drying treatment facility, and it comprises: vacuum extractor, hot oil circulating device, the large current flow heats device of ultralow frequency and timer.
Described vacuum extractor connects the conservator of converter transformer, for converter transformer body is vacuumized to processing.
One oil pipe line of described hot oil circulating device connects described pouring orifice, another oil pipe line connects described oil-out, for in the time that vacuum extractor vacuumizes, flow into transformer oil to converter transformer body, and described converter transformer body is carried out to Circulation and Hot Oil Spray heat treated.
The lead-in wire of the large current flow heats device of described ultralow frequency connection network side winding, the and when work of the large current flow heats device of ultralow frequency, adopt shorting stub by valve side winding short circuit, for exporting transformer oil described in the large current flow heats of ultralow frequency.
Described timer, for the operating time timing to the large current flow heats device of vacuum extractor, hot oil circulating device and ultralow frequency.
Further, described field drying treatment facility also comprises oil filter degassing tank, for carrying out degassed processing in Circulation and Hot Oil Spray processing.
In sum; the present invention carries out the processing of certain hour Circulation and Hot Oil Spray, large current flow heats Circulation and Hot Oil Spray processing in converter transformer body after oiling; then carry out again the Circulation and Hot Oil Spray of a period of time; can ensure that the moisture in transformer oil and insulating part assembly discharges in time; before guaranteeing that converter transformer puts into operation; Water in oil amount meets the requirements, and insulating resistance value meets code requirement, ensures to there will not be excessive the separating out of moisture in the time that converter transformer moves and affects the situation of transformer operation.And the control of oil temperature has avoided transformer oil rotten, transformer oil and then still can use, because treatment measures are only carried out after fixing link, do not affect the installment work of converter transformer, in the control of cost and time, there is very large advantage, and do not introduce other any risk that affects change of current change operation.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a converter transformer, it is characterized in that, comprise converter transformer body, in described converter transformer body, be provided with net side winding and valve side winding, between converter transformer body and net side winding and valve side winding, be filled with transformer oil, on described converter transformer body, be provided with the conservator for extracting transformer oil out, described conservator is positioned at the top of converter transformer body.
2. converter transformer according to claim 1, it is characterized in that, on described converter transformer body, be provided with pouring orifice and oil-out, described pouring orifice and the oil-out diagonal position in converter transformer body, described pouring orifice is positioned at the bottom of converter transformer body, and oil-out is positioned at the top of mailbox.
3. converter transformer according to claim 1, is characterized in that, on the lead-in wire of described net side winding, is provided with the first sleeve pipe, on the lead-in wire of described valve side winding, is provided with the second sleeve pipe.
4. a field drying processing method for the converter transformer as described in claims 1 to 3 any one, is characterized in that, comprising:
A, converter transformer complete auxiliary install after, converter transformer body is vacuumized to 120 hours;
B, in converter transformer body, carry out vacuum oil 24 hours, make to be full of transformer oil in converter transformer body;
C, employing hot oil circulating device carry out Circulation and Hot Oil Spray processing at least 24 hours to described converter transformer body;
D, enter the large current flow heats device of ultralow frequency at net side winding side joint, and by valve side short circuit in winding, heat oil temperature by short-circuit method and make temperature of oil in transformer reach 60～70 DEG C to continue circulation 24 hours;
E, remove the large current flow heats device of described ultralow frequency, proceed Circulation and Hot Oil Spray and process 36 hours, make temperature of oil in transformer more than 50 DEG C;
F, remove hot oil circulating device, make that converter transformer body is quiet to be put 120 hours.
5. field drying processing method according to claim 4, is characterized in that, described steps A also comprises: vacuumizing before timing, carry out leak rate test, guarantee that vacuum degree is in 100Pa, leak rate is in 30Pa.
6. field drying processing method according to claim 4, is characterized in that, in step B, the oil injecting speed of vacuum oil is 4t/h-6t/h.
7. field drying processing method according to claim 4, is characterized in that, described step C specifically comprises:
C1, employing hot oil circulating device carry out Circulation and Hot Oil Spray processing to described converter transformer body;
C2, in the time that reaching 50 DEG C, temperature of oil in transformer starts timing, and lasting Circulation and Hot Oil Spray 24 hours.
8. field drying processing method according to claim 4, is characterized in that, the electric current of the large current flow heats device output of described ultralow frequency is 700-800A, and power frequency is 0.08-0.1Hz.
9. field drying processing method according to claim 4, it is characterized in that, in step C or D or E, reach after 50 DEG C in oil temperature, carry out megger test and the puncture voltage test of converter transformer body every 12 hours, and get transformer oil sample testing moisture content.
10. for a field drying treatment facility for the converter transformer to described in claims 1 to 3 any one, it is characterized in that, comprising:
Vacuum extractor, for converter transformer body is vacuumized to processing, described vacuum extractor connects the conservator of converter transformer;
Hot oil circulating device, for in the time that vacuum extractor vacuumizes, flow into transformer oil to converter transformer body, and described converter transformer body is carried out to Circulation and Hot Oil Spray heat treated, one oil pipe line of described hot oil circulating device connects described pouring orifice, and another oil pipe line connects described oil-out;
The large current flow heats device of ultralow frequency, for exporting transformer oil described in the large current flow heats of ultralow frequency, the lead-in wire of the large current flow heats device of described ultralow frequency connection network side winding, and when the large current flow heats device work of ultralow frequency, adopt shorting stub by valve side winding short circuit;
Timer, for the operating time timing to the large current flow heats device of vacuum extractor, hot oil circulating device and ultralow frequency.
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| CN201410280951.9A CN104103409B (en) | 2014-06-20 | 2014-06-20 | The field drying processing method of converter power transformer |
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| CN201410280951.9A CN104103409B (en) | 2014-06-20 | 2014-06-20 | The field drying processing method of converter power transformer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106841952A (en) * | 2017-03-24 | 2017-06-13 | 山东电力设备有限公司 | A kind of devices and methods therefor for solving the problems, such as transformer partial discharge |
| CN108321712A (en) * | 2018-04-20 | 2018-07-24 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of transportable transformer device body drying device |
| CN109524198A (en) * | 2018-12-18 | 2019-03-26 | 中国能源建设集团安徽电力建设第二工程有限公司 | A kind of transformer installation method |
| CN109539751A (en) * | 2018-12-26 | 2019-03-29 | 江苏宏宝电力有限公司 | A kind of bushing shell for transformer dehumidification device and application method |
| CN113340073A (en) * | 2021-06-15 | 2021-09-03 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | On-site drying method and drying system for epoxy impregnated paper transformer |
| WO2023151273A1 (en) * | 2022-02-14 | 2023-08-17 | 青海送变电工程有限公司 | Heat preservation method and system for converter transformer |
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| CN204029564U (en) * | 2014-06-20 | 2014-12-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Converter transformer and field drying treatment facility |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841952A (en) * | 2017-03-24 | 2017-06-13 | 山东电力设备有限公司 | A kind of devices and methods therefor for solving the problems, such as transformer partial discharge |
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| CN108321712A (en) * | 2018-04-20 | 2018-07-24 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of transportable transformer device body drying device |
| CN109524198A (en) * | 2018-12-18 | 2019-03-26 | 中国能源建设集团安徽电力建设第二工程有限公司 | A kind of transformer installation method |
| CN109539751A (en) * | 2018-12-26 | 2019-03-29 | 江苏宏宝电力有限公司 | A kind of bushing shell for transformer dehumidification device and application method |
| CN109539751B (en) * | 2018-12-26 | 2023-05-30 | 江苏宏宝电力有限公司 | Transformer bushing dehumidification device and use method |
| CN113340073A (en) * | 2021-06-15 | 2021-09-03 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | On-site drying method and drying system for epoxy impregnated paper transformer |
| WO2023151273A1 (en) * | 2022-02-14 | 2023-08-17 | 青海送变电工程有限公司 | Heat preservation method and system for converter transformer |
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