CN106771092B - A kind of method of transformer oil time constant under definite different loads coefficient - Google Patents
A kind of method of transformer oil time constant under definite different loads coefficient Download PDFInfo
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- CN106771092B CN106771092B CN201611199650.9A CN201611199650A CN106771092B CN 106771092 B CN106771092 B CN 106771092B CN 201611199650 A CN201611199650 A CN 201611199650A CN 106771092 B CN106771092 B CN 106771092B
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- 230000007613 environmental effect Effects 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 2
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- 238000004364 calculation method Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
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Abstract
The invention discloses a kind of method of transformer oil time constant under definite different loads coefficient, comprise the following steps：Obtain transformer correlation thermal parameter, obtain specified top layer oil timeconstantτ by being fitted top-oil temperature changeoil,R, finally by introducing opposite top layer oil timeconstantτoil,puSolve the top layer oil timeconstantτ under different loadsoil.This method compensate for the blank that top layer oil time constant under different loads solves, while solve that mode is easy, information needed has obtained, and can provide foundation for the dynamic change of top-oil temperature.
Description
Technical field
The present invention relates to a kind of computational methods, and in particular to transformer oil time constant under a kind of definite different loads coefficient
Method, the technology be used for calculating transformer oil time constant dynamic change.
Background technology
Oil-immersed transformer is the core equipment of electrical power trans mission/distribution system, its life-span management and optimization design have obtained extensive pass
Note, temperature rise of hot spot are that the principal element of restriction transformer station high-voltage side bus is also to assess the major parameter of transformer insulated life loss, because
This research hot-spot temperature of transformer is particularly significant.
In Practical Project, hot(test)-spot temperature calculates and generally uses two-part Temperature Rise Model, i.e.,：Top layer oil phase is for environment temperature
Liter, hot spot are relative to top-oil temperature liter；Wherein, transformer top layer oil time constant describes top layer oil phase for environment temperature rise change
Speed；GB/T 1094.7 based on IEC is in Appendix D (page 31) given the calculation formula of transformer oil time constant, text
Table 4 (page 16) is then given for the different types of cooling, the reference value of capacitance grade.However, in order to obtain rated transformer top
The oily time constant, IEC directive/guides, IEEE directive/guides etc. of layer gives the solution mode of rated value.In actual motion, transformer top layer
Oily time constant can be with load factor (load current), transformer top-oil temperature degree, transformer oil viscosity, transformer oil flow velocity
Change and change.IEC directive/guides, IEEE directive/guides and related scholar once have studied transformer top-oil temperature degree, transformer oil viscosity
Influence to transformer top layer oil time constant.However, load factor (load current), as maximum factor is influenced, it is to becoming
The quantitative description that depressor top layer oil time constant influences does not have research but.Therefore it is badly in need of studying under a kind of definite different loads coefficient
The method of transformer oil time constant, so as to quantify shadow of the load factor (load current) to transformer top layer oil time constant
Ring.
The content of the invention
In view of this, the object of the present invention is to provide a kind of side of transformer oil time constant under definite different loads coefficient
Method, quantifies variation relation of the transformer top layer oil time constant with load factor (load current).
Technical proposal that the invention solves the above-mentioned problems is：
The first step, obtains transformer relevant parameter, including transformer oil index x, nominal load loss Pload,R, zero load damage
Consume Pno-load, specified top layer oil versus environmental temperature rise Δ θoil,R；
Second step, applying nominal load to transformer makes its cold start-up, and records the top-oil temperature θ changed over timeoil,
Nominal load action time makes top-oil temperature θ when small no less than 12oilRise and tend towards stability, and be fitted specified using following formula
Transformer oil timeconstantτoil,R,
Δθoil=θoil-θamb (1)
In formula, Δ θoilIt is top layer oil versus environmental temperature rise, θambIt is environment temperature；
3rd step, transformer oil time constant under different loads is calculated to obtain using following formula：
τoil=τoil,R×τoil,pu (4)
In formula, τoilIt is the transformer oil time constant under required different loads coefficient, τoil,puIt is description arbitrary load
The opposite transformer oil time constant of transformer oil time constant and rated transformer oil time constant relation, K is load factor,
R is nominal load loss Pload,RWith no-load loss Pno-loadThe ratio between；Transformer oil index x should be selected according to different heat dissipation types
Different value is taken, ONAN/ONAF type transformers x takes 0.8, OF/OD type transformers x to take 1.
The computational methods of transformer oil time constant, have the following advantages under different loads coefficient of the present invention：
1) the transformer oil time constant under different loads coefficient can be obtained, compared to changeless rated transformer oil
Time constant, it preferably reflects the actual dynamic change of transformer oil time constant；
2) the transformer oil time constant under different loads coefficient calculates easy, and parameter is dispatched from the factory i.e. by conventional transformer
The oily time constant variation relation of institute's research transformer can be calculated；
3) compared to the recommendation and calculation formula of rated value, at rated loads in long-time Cold Start, note
It is very accurate to be fitted rated transformer oil time constant to record top-oil temperature.
Brief description of the drawings
Fig. 1 be transformer at rated loads cold start-up when top-oil temperature；
Fig. 2 is the ratio between transformer oil time constant and rated transformer oil time constant under different loads, that is, opposite change
Depressor oil timeconstantτoil,puRelatively；
Transformer oil time constant under Fig. 3 different loads.
Embodiment
The present invention is further described with specific implementation process below in conjunction with the accompanying drawings.It is emphasized that this place
The specific implementation case of description only to explain patent of the present invention, is not intended to limit the present invention inventional idea and its right will
The scope asked.
The first step, obtains transformer relevant parameter, including transformer oil index x, nominal load loss Pload,R, zero load damage
Consume Pno-load, specified top layer oil versus environmental temperature rise Δ θoil,R.Table 1 is the above parameter of certain transformer.
Table 1
Second step, applying nominal load to transformer makes its cold start-up, and records the top-oil temperature θ changed over timeoil,
Nominal load action time makes top-oil temperature θ when small no less than 12oilRise and tend towards stability, as shown in Figure 1.And utilize following formula
It is fitted to obtain rated transformer oil timeconstantτoil,R,
Δθoil=θoil-θamb (5)
In formula, Δ θoilIt is top layer oil versus environmental temperature rise, θambIt is environment temperature；Wherein, θambConstant is 20 DEG C.
By the fitting to Fig. 1 data, formula (6) can be specially：
So as to τoil,RIt is determined as 7617s.
3rd step, transformer oil time constant under different loads is calculated to obtain using following formula：
τoil=τoil,R×τoil,pu (9)
In formula, τoilIt is the transformer oil time constant under required different loads coefficient, τoil,puIt is description arbitrary load
The opposite transformer oil time constant of transformer oil time constant and rated transformer oil time constant relation, K is load factor,
R is nominal load loss Pload,RWith no-load loss Pno-loadThe ratio between.According to studied transformer data, it is known that x 0.8, R are about
Equal to 3.9.So as to which formula (3), formula (4) can be identified as under the particular transformer studied：
τoil,puAs shown in Fig. 2, required transformer oil timeconstantτoilIt is as shown in Figure 3 with the relation of load factor.
Claims (1)
1. a kind of method of transformer oil time constant under definite different loads coefficient, by the transformer oil time under nominal load
Constant expands to arbitrary load to adapt to the change of transformer oil time constant under different loads coefficient, it is characterised in that this method
Comprise the following steps：
The first step, obtains transformer relevant parameter, including transformer oil index x, nominal load loss Pload,R, no-load loss
Pno-load, specified top layer oil versus environmental temperature rise Δ θoil,R；
Second step, applying nominal load to transformer makes its cold start-up, and records the top-oil temperature θ changed over timeoil, it is specified
The load effect time makes top-oil temperature θ when small no less than 12oilRise and tend towards stability, and specified transformation is fitted to obtain using following formula
Device oil timeconstantτoil,R,
Δθoil=θoil-θamb
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In formula, Δ θoilIt is top layer oil versus environmental temperature rise, θambIt is environment temperature；
3rd step, transformer oil time constant under different loads is calculated to obtain using following formula：
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τoil=τoil,R×τoil,pu
In formula, τoilIt is the transformer oil time constant under required different loads coefficient, τoil,puIt is description arbitrary load transformation
The opposite transformer oil time constant of device oil time constant and rated transformer oil time constant relation, K is load factor, and R is
P is lost in nominal loadload,RWith no-load loss Pno-loadThe ratio between；Transformer oil index x should choose not according to different heat dissipation types
With value, ONAN/ONAF type transformers x takes 0.8, OF/OD type transformers x to take 1.
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Citations (5)
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| US4775245A (en) * | 1986-12-12 | 1988-10-04 | Qualitrol Corporation | Multi-phase electronic temperature controller |
| CN102427218A (en) * | 2011-10-28 | 2012-04-25 | 武汉供电公司变电检修中心 | Transformer short period overload capability assessment system based on artificial intelligence technology |
| CN105160202A (en) * | 2015-10-12 | 2015-12-16 | 国家电网公司 | Method for calculating winding hot-spot temperature and top oil temperature of oil-immersed transformer |
| CN105550472A (en) * | 2016-01-20 | 2016-05-04 | 国网上海市电力公司 | Prediction method of transformer winding hot-spot temperature based on neural network |
| CN105684109A (en) * | 2013-10-22 | 2016-06-15 | Abb技术有限公司 | A method to optimize operation of a transformer cooling system,the corresponding system and a method to determine the vfd capacity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10192677B2 (en) * | 2014-08-12 | 2019-01-29 | Abb Inc. | Method and apparatus for leakage monitoring for oil-immersed electrical transformers |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4775245A (en) * | 1986-12-12 | 1988-10-04 | Qualitrol Corporation | Multi-phase electronic temperature controller |
| CN102427218A (en) * | 2011-10-28 | 2012-04-25 | 武汉供电公司变电检修中心 | Transformer short period overload capability assessment system based on artificial intelligence technology |
| CN105684109A (en) * | 2013-10-22 | 2016-06-15 | Abb技术有限公司 | A method to optimize operation of a transformer cooling system,the corresponding system and a method to determine the vfd capacity |
| CN105160202A (en) * | 2015-10-12 | 2015-12-16 | 国家电网公司 | Method for calculating winding hot-spot temperature and top oil temperature of oil-immersed transformer |
| CN105550472A (en) * | 2016-01-20 | 2016-05-04 | 国网上海市电力公司 | Prediction method of transformer winding hot-spot temperature based on neural network |
Non-Patent Citations (3)
| Title |
|---|
| 变压器热点温度计算经典模型的对比分析及改进;黄晓峰 等;《现代电力》;20130430;第30卷(第2期);第69-73也 * |
| 变压器顶层油温预测热模型影响因素分析及其改进;陈伟根 等;《高压电技术》;20110630;第37卷(第6期);第1329-1335页 * |
| 基于顶层油温的变压器绕组热点温度计算改进模型;陈伟根 等;《重庆大学学报》;20120531;第35卷(第5期);第69-75页 * |
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