CN109670198B - Method for calculating average temperature rise value of transformer winding - Google Patents
Method for calculating average temperature rise value of transformer winding Download PDFInfo
- Publication number
- CN109670198B CN109670198B CN201811320760.5A CN201811320760A CN109670198B CN 109670198 B CN109670198 B CN 109670198B CN 201811320760 A CN201811320760 A CN 201811320760A CN 109670198 B CN109670198 B CN 109670198B
- Authority
- CN
- China
- Prior art keywords
- temperature rise
- transformer
- value
- average temperature
- winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
A method for calculating the average temperature rise value of a transformer winding comprises the following steps:△T=0.0051x+1.548×10 ‑5 ×x 2 -1.97223, wherein: Δ T is set as the average winding temperature rise, x is set as the calculated median: x = e
X (319.76483 +44.62863a-0.42611 a), b is set as a current transformer CT value, e is set as a current transformer real-time current collection value, a is set as a winding group oil average temperature rise value ty, c is set as a transformer high-pressure phase rated current and c = d × b, d is set as a secondary rated current value Ip, the winding average temperature rise value is directly obtained through direct digital calculation of variable parameters, and analog parameters are not used as calculation bases, so that the winding average temperature rise value calculation step and the implementation device are simplified.
Description
1. Field of the invention
The invention relates to a method for calculating an average temperature rise value of a transformer winding, in particular to a method suitable for calculating the average temperature rise value of an oil-immersed transformer winding.
2. Background of the invention
The method is an important way for ensuring the safe operation of the transformer, and in the existing method for calculating the average temperature rise value of the transformer winding, a mechanical winding thermometer is a special monitoring (control) instrument for measuring the hottest point temperature of the power transformer winding by using a thermal simulation measurement technology. The thermal simulation measurement technology is characterized in that an additional temperature rise delta T of the change of the load current of the transformer is applied on the basis of the top oil temperature T0 of the transformer, which is easy to measure, so that the sum T = T0+ delta T of the temperature rise delta T can simulate the hottest point temperature of the transformer.
When the transformer is loaded, the current which is taken out by the transformer current transformer and is in direct proportion to the load flows through the electric heating element embedded in the corrugated pipe after being adjusted by the converter. The displacement of the elastic element is increased by the heat generated by the electric heating element. Therefore, after the transformer is loaded, the displacement of the elastic element is determined by the top oil temperature of the transformer and the load current of the transformer. The temperature indicated by the transformer winding temperature controller is the sum of the temperature of the top layer oil of the transformer and the temperature rise of the coil to the oil, and reflects the temperature of the measured transformer winding.
Because the rated output current of the CT of each oil-immersed transformer Is possibly different, the difference between the coil and the oil temperature Is also possibly different, different temperature difference values need different values of the working current Is to be simulated, for example, as a gear selection table in figure 1,
looking up the transformer specification to obtain the transformer current transformer CT and the secondary rated current value Ip, looking up the table to select four gears of the current transformer A, B, C and D, and pressing the corresponding key. Finding the average temperature rise of the transformer winding to oil: ty, looking up the graph of the temperature rise characteristic to obtain the value I, calculating the value I/Ip and looking up the graph to obtain the four K values of the converters 1, 2, 3 and 4 to be selected, such as the temperature characteristic curve of FIG. 2,
therefore, in order to accurately monitor the average temperature rise of the transformer winding, a mechanical meter needs to perform complex calculation and gear selection, and the winding temperature monitoring is inaccurate due to the gear selection error, even the winding temperature controller is burnt, as shown in a schematic diagram of the connection relation of the device in fig. 3, wherein a 1-Current Transformer (CT), a 2-current matcher BL, a 3-electrothermal element, a 4-indicating pointer, a 5-precision potentiometer and a 6-digital display XMT-288 are shown, the current matcher used by the mechanical temperature controller is a current changer which is used for providing working current for the mechanical winding temperature controller, and the current output from the current transformer of the transformer is converted by the current matcher to provide adjustable current for the electrothermal element in the temperature controller, so that the temperature of the hottest part of the transformer winding can be simulated.
The application technical scheme is made based on the technical problem, technical feature and technical effect existing in the technical book of the applicant in 2018, 8, 15 and the background technology.
3. Summary of the invention
The invention aims to provide a method for calculating an average temperature rise value of a transformer winding.
In order to overcome the technical defects, the invention aims to provide a method for calculating the average temperature rise value of a transformer winding, thereby simplifying the calculation steps of the average temperature rise value of the winding and a realization device.
In order to achieve the purpose, the invention adopts the technical scheme that: the method comprises the following steps:
△T=0.0051x+1.548×10 -5 ×x 2 -1.97223，
wherein: Δ T is set as the average temperature rise value of the winding,
x is set to compute the median value: x = e
×（319.76483+44.62863a - 0.42611a²），
b is set to the CT value of the current transformer,
e is set as a current transformer for collecting real-time current value,
a is set to the winding-to-oil average temperature rise value ty,
c is set to the transformer high voltage phase current rating and c = d x b,
d is set to the secondary rated current value Ip.
The method for calculating the average temperature rise value of the transformer winding is designed, the average temperature rise value of the winding is directly obtained through direct digital calculation of variable parameters, and analog parameters are not used as calculation bases, so that the calculation steps of the average temperature rise value of the winding are simplified, and a device is realized.
The invention designs that the CT value of the current transformer, the secondary rated current value Ip and the average temperature rise value ty of the winding to oil are set as the design parameters of the transformer.
The invention designs that a medium containing a calculation method program of the average temperature rise value of the transformer winding is implanted into the singlechip.
The invention has the technical effects that: the convenience of winding temperature rise calculation is improved, and data are accurate and stable; the stability and the anti-interference performance of the device are improved qualitatively by a reasonable logic control mode and modularized circuit processing; superior components and parts are treated by multiple protection measures, so that the superior quality of the product is ensured; the scientific compensation algorithm and the processing of multiple protection measures ensure the accuracy of the product.
In the technical scheme, Δ T =0.0051x +1.548 × 10 -5 ×x 2 -1.97223 is an important technical feature, and has novelty, creativity and practicability in the technical field of the method for calculating the average temperature rise value of the transformer winding, and the terms in the technical scheme can be explained and understood by the patent literature in the technical field.
4. Description of the drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Figure 1 is a table of gear selection in the background of the invention,
FIG. 2 is a temperature characteristic curve in the background art of the present invention,
fig. 3 is a schematic diagram of the connection relationship of the apparatuses in the background art of the present invention.
5. Detailed description of the preferred embodiments
Terms such as "having," "including," and "comprising," as used with respect to the present invention, are to be understood as not specifying the presence or addition of one or more other elements or combinations thereof, in accordance with the examination guidelines.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention is further described below with reference to the following examples, which are intended to illustrate the invention but not to further limit it.
The method comprises the following steps: delta T =0.0051x +1.548 x 10 -5 ×x 2 -1.97223，
Wherein: Δ T is set as the average temperature rise value of the winding,
x is set to compute the median value: x = e
×（319.76483+44.62863a - 0.42611a²），
b is set to the CT value of the current transformer,
e is set as a current transformer for collecting real-time current value,
a is set to the winding-to-oil average temperature rise value ty,
c is set to the transformer high voltage phase current rating and c = d x b,
d is set to the secondary rated current value Ip,
in the present embodiment, the current transformer CT value, the secondary rated current value Ip, and the winding-to-oil average temperature rise value ty are determined by the design parameters of the transformer.
In this embodiment, a medium containing a calculation method program of the average temperature rise value of the transformer winding is embedded in the single chip microcomputer.
And when the a, the b, the c and the e are input into a storage chip of the singlechip, fitting a temperature rise characteristic curve graph by using a least square method, and obtaining a winding average temperature rise value delta T according to a calculation formula of the transformer winding average temperature rise value.
The verification of the calculation method of the average temperature rise value of the transformer winding comprises the following steps:
standard calculation steps:
1. three parameters are provided by the transformer: secondary rated current IP, current transformer transformation ratio CT and copper oil temperature difference TY;
example (c): a 180000/220 transformer, IP =472.4A; CT is 500/5=100; TY =22.5;
2. the measured CT current I is assumed to be 3.5A;
thus calculating the heating current is = -under the corresponding load
×Is；
Wherein Is the corresponding heating current under the rated load, which can be found from the curve of fig. 2: the copper oil temperature difference 22.5 is between 22 and 24 when in rated load, the interval can be approximate to a straight line relation,
therefore, is = Is22+ can be calculated by using difference algorithm
×（TY-22）=1.09+ 
×（22.5-22）=1.1025A；
Therefore i s =
×1.1025=0.817A
3. I calculated above s The temperature to be compensated under the corresponding load is calculated according to the difference strategy and the table above between 0.8 and 0.86 (namely 12 to 14 ℃ of delta T)
ΔT=（i s -I s12 ）×+12=12.57℃
The method for calculating the average temperature rise value of the transformer winding comprises the following steps:
1. three parameters are provided by the transformer: rated current Ip, current transformer transformation ratio CT and copper oil temperature difference TY;
example (c): a 180000/220 transformer, ip =472.4A; CT is 500/5=100; TY =22.5;
then a =22.5, b =500/5=100, d =4.724, c = b × d =472
2. The measured CT current I is assumed to be 3.5A; e =3.5
3. Substituting a, b, c and e into the following formula.
x=e×
×（319.76483+44.62863a - 0.42611a²）
△T=0.0051x+1.548×10 -5 ×x 2 -1.97223
Post calculation Δ T =12.6714
According to the requirement of JB T8450-2016 winding temperature controller for transformer on the accuracy grade of 1.5 or 2.0 grade of mechanical temperature controller, the error of the invention is inferred to meet the standard requirement of mechanical industry.
The invention has the following characteristics:
1. the method for calculating the average temperature rise value of the transformer winding is designed, the average temperature rise value of the winding is directly obtained through direct digital calculation of variable parameters, and analog parameters are not used as calculation bases, so that the calculation steps of the average temperature rise value of the winding are simplified, and a device is realized.
2. Because the calculation method of the average temperature rise value of the transformer winding is designed, the calculation precision of the average temperature rise value of the winding is improved.
3. Because the calculation method of the average temperature rise value of the transformer winding is designed and is directly realized by the program of the single chip microcomputer, the calculation efficiency of the average temperature rise value of the winding is improved.
4. Because the structural shape is limited by the numerical range, the numerical range is the technical characteristic of the technical scheme of the invention, and is not the technical characteristic obtained by formula calculation or limited tests, and tests show that the technical characteristic of the numerical range achieves good technical effect.
5. Due to the design of the technical characteristics of the invention, under the action of the individual and mutual combination of the technical characteristics, tests show that each performance index of the invention is at least 1.7 times of that of the existing performance index, and the invention has good market value through evaluation.
Still others are 1.548 x 10 + with delta T =0.0051x + -5 ×x 2 -1.97223 identical or similar features are one of the embodiments of the present invention, and the features of the above-mentioned embodiments can be arbitrarily combined, and in order to meet the requirements of patent laws, patent implementation rules and inspection guidelines, the description of all possible combinations of the features of the above-mentioned embodiments is not repeated.
The above embodiment is only one implementation form of the method for calculating the average temperature rise value of the transformer winding provided by the present invention, and it is within the protection scope of the present invention to add or reduce components or steps therein according to other variations of the scheme provided by the present invention, or to apply the present invention to other technical fields close to the present invention.
Claims (3)
1. A method for calculating the average temperature rise value of a transformer winding is characterized by comprising the following steps: the method comprises the following steps:
△T=0.0051x+1.548×10 -5 ×x 2 -1.97223，
wherein: Δ T is set as the average temperature rise value of the winding,
x is set to compute the median value: x = e
×（319.76483+44.62863a - 0.42611a²），
b is set to the CT value of the current transformer,
e is set as a current transformer to collect real-time current values,
a is set to the winding-to-oil average temperature rise value ty,
c is set to the transformer high voltage phase current rating and c = d x b,
d is set to the secondary rated current value Ip.
2. The method for calculating the average temperature rise value of the transformer winding according to claim 1, wherein: the CT value of the current transformer, the secondary rated current value Ip and the average temperature rise ty of the windings to the oil are set as design parameters of the transformer.
3. The method for calculating the average temperature rise value of the transformer winding according to claim 1, wherein: a medium containing a calculation method program of the average temperature rise value of the transformer winding is implanted into the singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320760.5A CN109670198B (en) | 2018-11-07 | 2018-11-07 | Method for calculating average temperature rise value of transformer winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320760.5A CN109670198B (en) | 2018-11-07 | 2018-11-07 | Method for calculating average temperature rise value of transformer winding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109670198A CN109670198A (en) | 2019-04-23 |
| CN109670198B true CN109670198B (en) | 2023-01-03 |
Family
ID=66141981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811320760.5A Active CN109670198B (en) | 2018-11-07 | 2018-11-07 | Method for calculating average temperature rise value of transformer winding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109670198B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10119201A1 (en) * | 2001-04-19 | 2002-10-24 | Bsh Bosch Siemens Hausgeraete | Method for measuring the winding temperature of drive motor e.g. for washing machine, requires measuring current flow through at least one winding of motor |
| CN102435334A (en) * | 2011-08-29 | 2012-05-02 | 杭州鸿程科技有限公司 | Method for measuring temperature of transformer winding |
| CN103292922A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Winding temperature measuring method of oil-immersed power transformer |
| CN105067144A (en) * | 2015-07-28 | 2015-11-18 | 泰安屹思达智能科技有限公司 | Winding temperature calculation method for fiber temperature controller of transformer |
-
2018
- 2018-11-07 CN CN201811320760.5A patent/CN109670198B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10119201A1 (en) * | 2001-04-19 | 2002-10-24 | Bsh Bosch Siemens Hausgeraete | Method for measuring the winding temperature of drive motor e.g. for washing machine, requires measuring current flow through at least one winding of motor |
| CN102435334A (en) * | 2011-08-29 | 2012-05-02 | 杭州鸿程科技有限公司 | Method for measuring temperature of transformer winding |
| CN103292922A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Winding temperature measuring method of oil-immersed power transformer |
| CN105067144A (en) * | 2015-07-28 | 2015-11-18 | 泰安屹思达智能科技有限公司 | Winding temperature calculation method for fiber temperature controller of transformer |
Non-Patent Citations (1)
| Title |
|---|
| 一种变压器绕组温度测量方法;冯悦波;《变压器》;20010525(第05期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109670198A (en) | 2019-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI261270B (en) | Transformer monitoring system | |
| Radakovic et al. | A new method for the calculation of the hot-spot temperature in power transformers with ONAN cooling | |
| CN112115628B (en) | Hot spot temperature detection method based on distribution calculation of temperature field of oil-immersed transformer | |
| CN106199118B (en) | Capacitor voltage-dividing type zero sequence voltage transformer with power output | |
| CN103292922A (en) | Winding temperature measuring method of oil-immersed power transformer | |
| CN109060180A (en) | The data processing method of oil-immersed transformer hot spot temperature of winding | |
| Hill et al. | An ac double bridge with inductively coupled ratio arms for precision platinum-resistance thermometry | |
| CN109670198B (en) | Method for calculating average temperature rise value of transformer winding | |
| CN103063963B (en) | A kind of transformer capacity method of testing | |
| Arnold | Current-transformer testing | |
| CN105067144A (en) | Winding temperature calculation method for fiber temperature controller of transformer | |
| CN105974349B (en) | A kind of measuring method of current transformer tracking accuracy | |
| CN102435334A (en) | Method for measuring temperature of transformer winding | |
| CN210005675U (en) | low-voltage-class CVT testing device | |
| CN109799391A (en) | Conductor AC resistance measurement method, system and computer storage medium | |
| CN101872007B (en) | Calibration method of three-phase voltage transformer based on voltage transformer load error curve extrapolation | |
| CN115774173A (en) | Dry-type transformer insulation performance evaluation device and method | |
| CN103543429A (en) | Micro current transformer calibrator | |
| CN206431514U (en) | A kind of high precision broad frequency wide-range Current Voltage conversion equipment | |
| CN1033417A (en) | The electric apparatus temperature rise automatic detection device | |
| CN104502678B (en) | The method for measuring power transformer voltage ratio | |
| CN108917982B (en) | Non-invasive winding temperature measurement method for oil-immersed self-cooling layer type winding transformer | |
| RU2248003C2 (en) | Device for calibrating instrument current transformers | |
| CN111366883B (en) | High-precision magnetic core loss test circuit and method | |
| JPH0836003A (en) | Resistance-value measuring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |