CN106783039B - The structural optimization method of hybrid insulation systems oil-immersed transformer - Google Patents
The structural optimization method of hybrid insulation systems oil-immersed transformer Download PDFInfo
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- CN106783039B CN106783039B CN201611095456.6A CN201611095456A CN106783039B CN 106783039 B CN106783039 B CN 106783039B CN 201611095456 A CN201611095456 A CN 201611095456A CN 106783039 B CN106783039 B CN 106783039B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
Abstract
Hybrid insulation systems oil-immersed transformer, including oil-immersed transformer main body, wherein, the insulating oil in oil-immersed transformer main body uses mineral insulating oil, and the insulating paper in oil-immersed transformer main body uses DPE insulating papers.The invention also discloses the structural optimization method of above-mentioned hybrid insulation systems oil-immersed transformer.The present invention can lift oil-immersed transformer overload capacity in the case where only replacing solid insulating material, it can not only continue to continue to use the operation and maintenance for mineral insulating oil and fault detection criteria, the development cost for exceeding loading capability transformer can also be greatly lowered, reliability gets both with economy, easy to utilize.
Description
Technical field
The present invention relates to the knot of design of transformer and applied technical field, specifically hybrid insulation systems oil-immersed transformer
Structure optimization method.
Background technology
As national economy is fast-developing, network load grows continuously and fast, and power grid construction relatively lags behind, and causes electricity
Power transformer load rate remains high, or even long term overloading operation.Transformers for Rural Networks is special due to its local environment
Property, seasonal overload conditions are particularly acute.To solve overload problem, the development for exceeding loading capability transformer is extremely urgent.It is existing
High overload transformer is generally replaced the insulating materials of traditional transformer using new type high temperature liquid and solid insulating material,
It is costly, and the operation of traditional oil-immersed transformer, maintenance criterion can not be applied.How oil-immersed transformer liquid is being changed without
The development cost of transformer is reduced while body insulating materials, this becomes current people's question of common concern.However, do not have now
There is corresponding equipment, also have no relevant report.
The content of the invention
The mixed of transformer development cost can be reduced it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of
Close insulation system oil-immersed transformer.The invention also discloses the structure optimization side of above-mentioned hybrid insulation systems oil-immersed transformer
Method, it can carry out reasonably optimizing to transformer device structure in the case where insulating materials changes, can further reduce oil immersed type transformation
The manufacture cost of device so that oil-immersed transformer is more convenient for promoting and applying.
The present invention, which solves the above problems, to be achieved through the following technical solutions：Hybrid insulation systems oil-immersed transformer,
Including oil-immersed transformer main body, the insulating oil in the oil-immersed transformer main body uses mineral insulating oil, oil immersed type transformation
Insulating paper in device main body uses DPE insulating papers.Wherein, the insulating paper in oil-immersed transformer main body of the present invention is exhausted using DPE
Edge paper, it has wet-out rate is fast in mineral insulating oil, drying time is short, temperature resistant grade is high, good mechanical property, price are low etc.
Advantage.
Based on the structural optimization method of above-mentioned hybrid insulation systems oil-immersed transformer, comprise the following steps：
Step 1: calculating Conventional insulation system oil-immersed transformer under long-term emergent overload allows overload magnification and mixes
Insulation system oil-immersed transformer permission overload magnification is closed, and calculate hybrid insulation systems oil-immersed transformer to allow overload times
Number allows the ratio of overload magnification with Conventional insulation system oil-immersed transformer；
Step 2: the hybrid insulation systems oil-immersed transformer calculated is allowed into overload magnification and Conventional insulation system oil
Immersion transformer allows the ratio of overload magnification to be equivalent to winding resistance loss ratio in oil-immersed transformer main body, according to winding
Resistance loss radiometer calculates winding conducting wire reduced radius ratio, and by winding conducting wire radius in oil-immersed transformer main body based on
The winding conducting wire reduced radius ratio calculated is reduced；
Step 3: the box volume of oil-immersed transformer main body, core volume, insulating oil dosage and insulating paper dosage are pressed
The winding conducting wire reduced radius ratio calculated is reduced, by the winding copper material dosage of oil-immersed transformer main body by calculating
Winding conducting wire reduced radius ratio square reduced.
Further, the permission overload magnification of oil-immersed transformer is by overloading under long-term emergent overload in the step 1
When hot(test)-spot temperature limit value corresponding overload magnification determine, wherein, the calculation formula of hot(test)-spot temperature is during overload：
Wherein, θh(t) it is hot(test)-spot temperature, θaFor environment temperature, △ θoiFor original state top-oil temperature liter,For initial shape
State hot spot is poor to top-oil temperature degree, △ θorFor top-oil temperature liter under total losses,It is hot spot under rated current to top-oil temperature degree
Difference, R are load loss and no-load loss ratio, and K is load factor, and x is top layer oil index, and y is around class index, function f1(t)
The function of time of rising amount, f are gone up for reflection top-oil temperature2(t) function of time for reflection hot spot to the difference change of top-oil temperature degree.
The present invention is different from the solid insulating material that Conventional insulation system uses, but cools down medium and use mineral insulation
Oil, therefore under identical heat condition, the two Temperature Distribution is identical, and the hot(test)-spot temperature reached is also identical, therefore can use identical
Hot(test)-spot temperature calculation formula.
Further, the relation between winding resistance and the winding conducting wire radius is as follows：
Wherein, R' is winding resistance, and ρ is winding conductor resistivity of material, and l is winding conductor length, and S cuts for winding conductor
Area, r are winding conductor radius.Calculate that winding wire diameter reduces ratio based on the fever principle of equal effects during present invention application, ignore change
Influence of the depressor no-load loss for temperature rise, it is believed that load loss is to cause the elevated main cause of winding temperature, approximate by winding electricity
Resistance loss is considered as transformer heat source, is assessed, examined by the overload capacity of transformer of the present invention and Conventional insulation system transformer
Consider the relation between winding resistance and winding conducting wire radius, calculate the reduction ratio of winding wire diameter.
In conclusion the invention has the advantages that：(1) present invention is in the case where only replacing solid insulating material
Oil-immersed transformer overload capacity can be lifted, can not only continue to continue to use the operation and maintenance for mineral insulating oil and fault detect mark
It is accurate, moreover it is possible to the development cost for exceeding loading capability transformer to be greatly lowered, reliability gets both with economy.
(2) performance difference of the invention based on novel solid insulating materials and conventional solid insulating materials, compares this hair
The overload capacity of the bright transformer and traditional transformer, for transformer of the present invention propose reduce winding wire diameter,
Reduce core volume, reduce box volume, reduce the structure optimization suggestions such as insulating materials dosage, it is highly practical, it is mix insulation
The structure design of system transformer provides theoretical foundation, and reduces it and manufacture cost, has and utilizes hybrid insulation systems transformation
The popularization and use of device, have important theory value and realistic meaning.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment：
Hybrid insulation systems oil-immersed transformer, including oil-immersed transformer main body, wherein, in oil-immersed transformer main body
Insulating oil use mineral insulating oil, the insulating paper in oil-immersed transformer main body uses DPE insulating papers.
It is old to have carried out the heat of 2 years by a definite date for DPE insulating papers according to IEEE C57.100-2011 directive/guides for Wei De Mann
Change experiment, result of the test is as shown in table 1.From table 1：DPE insulating papers and the hybrid insulation systems that mineral insulating oil forms are resistance to
Hot grade is 130 DEG C, that is, using the hybrid insulation systems class of insulation of DPE insulating papers, transformer insulated spoilage does not surpass for B grades
Hot(test)-spot temperature limit value when crossing allowed band is 165 DEG C.
Since the flash-point of all kinds of mineral insulating oils is in 100 DEG C~170 DEG C sections, particular kind of mineral are selected
Insulating oil can meet that flash-point is higher than 165 DEG C of requirement, then the performance of mineral insulating oil will not become hybrid insulation systems transformer
The limiting factor of overload capacity.
1 DPE insulation system thermal aging tests result of table is summarized
Based on the structural optimization method of above-mentioned hybrid insulation systems oil-immersed transformer, comprise the following steps：Step 1: meter
Calculating Conventional insulation system oil-immersed transformer under long-term emergent overload allows overload magnification and hybrid insulation systems oil immersed type to become
Depressor allows overload magnification, and calculates hybrid insulation systems oil-immersed transformer permission overload magnification and Conventional insulation system oil
Immersion transformer allows the ratio of overload magnification；Step 2: the hybrid insulation systems oil-immersed transformer calculated was allowed
Carry multiple and Conventional insulation system oil-immersed transformer allow the ratio of overload magnification be equivalent in oil-immersed transformer main body around
Group resistance loss ratio, is lost ratio according to winding resistance and calculates winding conducting wire reduced radius ratio, and by oil immersed type transformation
Winding conducting wire radius is reduced in the winding conducting wire reduced radius ratio calculated in device main body；Step 3: oil immersed type is become
Box volume, core volume, insulating oil dosage and the insulating paper dosage of depressor main body are by the winding conducting wire reduced radius calculated
Ratio is reduced, by the winding copper material dosage of oil-immersed transformer main body in the winding conducting wire reduced radius ratio calculated
Square reduced.
The present embodiment in the specific implementation, in step 1 under long-term emergent overload oil-immersed transformer permission overload magnification
The corresponding overload magnification of hot(test)-spot temperature limit value determines during by overloading, wherein, the calculation formula of hot(test)-spot temperature is during overload：
Wherein, θh(t) it is hot(test)-spot temperature, θaFor environment temperature, △ θoiFor original state top-oil temperature liter,For initial shape
State hot spot is poor to top-oil temperature degree, △ θorFor top-oil temperature liter under total losses,It is hot spot under rated current to top-oil temperature degree
Difference, R are load loss and no-load loss ratio, and K is load factor, and x is top layer oil index, and y is around class index, function f1(t)
The function of time of rising amount, f are gone up for reflection top-oil temperature2(t) function of time for reflection hot spot to the difference change of top-oil temperature degree.
In the specific implementation, the relation between winding resistance and winding conducting wire radius is as follows for the present embodiment：
Wherein, R' is winding resistance, and ρ is winding conductor resistivity of material, and l is winding conductor length, and S cuts for winding conductor
Area, r are winding conductor radius.
The liquid insulating material of Conventional insulation system generally uses mineral insulating oil, and fixed insulating materials generally uses fiber
Plain insulating paper, liquid insulating material of the invention use mineral insulating oil, and fixed insulating materials uses DPE insulating papers.
The present embodiment calculates hot(test)-spot temperature using formula (1), wherein, the parameter value in formula (1) uses recommendation more.Table
2 show oil-immersed transformer thermal characteristic parameter recommendation when cooling medium uses mineral insulating oil in insulation system.
2 oil-immersed transformer thermal characteristic parameter recommendation of table
| Thermal characteristic parameter | Recommendation |
| Oily index x | 0.8 |
| Around class index y | 1.6 |
| Oily timeconstantτo | 180 |
| Winding timeconstantτw | 4 |
| Constant k11 | 1.0 |
| Constant k21 | 1.0 |
| Constant k22 | 2.0 |
| Loss ratio R | 5 |
| Hot spot coefficient H | 1.1 |
| Top-oil temperature rises Δ θ under total lossesor | 55 |
| Hot spot is to top-oil temperature degree gradient Hg under rated currentr | 23 |
It can be calculated：Permission overload magnification under the long-term emergent overload of Conventional insulation system oil immersion-type distribution transformer is
1.34 times, the permission overload magnification under the long-term emergent overload of transformer described in the present embodiment is 1.53 times, i.e., using heat safe
General fibre element paper replaces DPE insulating papers, the overload capacity of oil immersion-type distribution transformer can be promoted to 1.53 times by 1.34 times,
It is sufficient for rural power grids overload demand.
In oil immersion-type distribution transformer operation, ignore influence of the no-load loss for temperature rise, it is believed that load loss is to make
Into the elevated main cause of winding temperature.And winding resistance loss in load loss proportion more than 95%, then can approximation will be around
Group resistance loss is considered as the heat source of oil-immersed transformer fever.
Under identical overload magnification, the heat source size that transformer described in the present embodiment can be born can reach Conventional insulation system
1.14 times of transformer.When transformer institute bringing onto load is constant, winding resistance loss is directly proportional to winding resistance, can using formula (4)
, when winding conducting wire reduced radius is original 0.94 times, ignore winding wire diameter reduce caused by winding copper wire total length and case
The reduction of body horizontal direction size, core volume can be reduced into original 0.94 times, and transformer-cabinet volume can be reduced into originally
0.94 times, insulating oil dosage can be reduced into original 0.94 times, and insulating paper dosage can be reduced into original 0.94 times, winding copper
Timber-used amount can be reduced to original 0.88 times.In this way, transformer manufacturing cost can be reduced to a certain extent by reducing winding wire diameter,
And the hybrid insulation systems transformer overload ability after line footpath adjustment is suitable with Conventional insulation system transformer, therefore the knot
Structure Adjusted Option is only applicable to overload lighter area, can reduce hybrid insulation systems oil-immersed transformer material cost.
Using the hybrid insulation systems oil-immersed transformer temperature capacity of DPE insulating papers and mineral insulating oil relatively using common
The Conventional insulation system oil-immersed transformer of cellulose paper and mineral insulating oil is higher by about 15%, then compares Conventional insulation system oil
Immersion transformer, heat radiation oil duct, import and export oil footpath between hybrid insulation systems oil-immersed transformer winding can reduce about 10%,
Corrugation radiator is such as used, then the ripple wing number of corrugation radiator also can be reduced accordingly.The structural adjustment scheme can be overloaded in lifting
Hybrid insulation systems oil-immersed transformer material cost is reduced while ability, there is wittrgreat utility.
Above-described embodiment, has carried out the purpose of the present invention, technical solution and beneficial effect further
Describe in detail, it should be understood that the foregoing is merely the embodiment of the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done, should all include
Within protection scope of the present invention.
Claims (3)
1. the structural optimization method of hybrid insulation systems oil-immersed transformer, hybrid insulation systems oil-immersed transformer, including oil
Immersion transformer body, the insulating oil in the oil-immersed transformer main body use mineral insulating oil, oil-immersed transformer main body
Interior insulating paper uses DPE insulating papers, it is characterised in that the described method comprises the following steps：
Allow overload magnification and mixing exhausted Step 1: calculating Conventional insulation system oil-immersed transformer under long-term emergent overload
Edge system oil-immersed transformer allow overload magnification, and calculate hybrid insulation systems oil-immersed transformer allow overload magnification with
Conventional insulation system oil-immersed transformer allows the ratio of overload magnification；
Step 2: the hybrid insulation systems oil-immersed transformer calculated is allowed into overload magnification and Conventional insulation system oil immersed type
Transformer allows the ratio of overload magnification to be equivalent to winding resistance loss ratio in oil-immersed transformer main body, according to winding resistance
Loss ratio calculates winding conducting wire reduced radius ratio, and by winding conducting wire radius in oil-immersed transformer main body by calculating
Winding conducting wire reduced radius ratio reduced；
Step 3: by the box volume of oil-immersed transformer main body, core volume, insulating oil dosage and insulating paper dosage by calculating
The winding conducting wire reduced radius ratio gone out is reduced, by the winding copper material dosage of oil-immersed transformer main body by calculate around
Scaled down square of wire radius of group is reduced.
2. the structural optimization method of hybrid insulation systems oil-immersed transformer according to claim 1, it is characterised in that institute
Hot(test)-spot temperature limit value corresponds to when the permission overload magnification for stating oil-immersed transformer under long-term emergent overload in step 1 is by overloading
Overload magnification determine, wherein, the calculation formula of hot(test)-spot temperature is during overload：
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Wherein, θh(t) it is hot(test)-spot temperature, θaFor environment temperature, △ θoiFor original state top-oil temperature liter, HgiFor original state heat
Point, △ θ poor to top-oil temperature degreeorFor top-oil temperature liter, H under total lossesgr, the R poor to top-oil temperature degree for hot spot under rated current
For load loss and no-load loss ratio, K is load factor, and x is top layer oil index, and y is around class index, function f1(t) it is anti-
Reflect the function of time that top-oil temperature goes up rising amount, f2(t) function of time for reflection hot spot to the difference change of top-oil temperature degree, k11、
k21、k22For constant；τoFor oily time constant, τwFor winding time constant.
3. the structural optimization method of hybrid insulation systems oil-immersed transformer according to claim 1 or 2, its feature exist
In the relation between winding resistance and the winding conducting wire radius is as follows：
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| CN104134519A (en) * | 2014-07-15 | 2014-11-05 | 国家电网公司 | Environmentally friendly oil-immersed distribution transformer based on high ignition point vegetable oil |
| CN104593054A (en) * | 2015-01-30 | 2015-05-06 | 西安热工研究院有限公司 | Method for improving interfacial tension of mineral insulating oil |
| CN106096256A (en) * | 2016-06-07 | 2016-11-09 | 四川大学 | Oil-filled transformer solids mixing insulation system division temperature and the computational methods of allocation ratio |
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2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745820A (en) * | 2014-01-22 | 2014-04-23 | 云南电力试验研究院（集团）有限公司电力研究院 | Manufacturing method of antiaging hybrid insulating oil transformer |
| CN103884818A (en) * | 2014-03-31 | 2014-06-25 | 苏州热工研究院有限公司 | Method for measuring activation energy of transformer insulating paper and method for predicting service life of transformer insulating paper |
| CN104134519A (en) * | 2014-07-15 | 2014-11-05 | 国家电网公司 | Environmentally friendly oil-immersed distribution transformer based on high ignition point vegetable oil |
| CN104593054A (en) * | 2015-01-30 | 2015-05-06 | 西安热工研究院有限公司 | Method for improving interfacial tension of mineral insulating oil |
| CN106096256A (en) * | 2016-06-07 | 2016-11-09 | 四川大学 | Oil-filled transformer solids mixing insulation system division temperature and the computational methods of allocation ratio |
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