CN102288316B - Digital transformer winding temperature measuring device - Google Patents
Digital transformer winding temperature measuring device Download PDFInfo
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- CN102288316B CN102288316B CN201110251581.2A CN201110251581A CN102288316B CN 102288316 B CN102288316 B CN 102288316B CN 201110251581 A CN201110251581 A CN 201110251581A CN 102288316 B CN102288316 B CN 102288316B
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Abstract
The invention discloses a digital transformer winding temperature measuring device, comprising a current converter, a relation computation module, a thermal simulation computation module, a response time setting module and an addition computation module as well as an oil temperature sensor and a temperature display and control module. The current converter is connected with the relation computation module; the relation computation module is connected with a thermal simulation computation module; the thermal simulation computation module, the oil temperature sensor and the temperature display and control module are connected with the addition computation module, respectively; and the response time setting module is connected with the thermal simulation computation module. In the invention, the current converter and a circuit module are added, so that outputting of a current signal is realized, a microprocessor is used for calculating transformer winding temperature by means of mathematic modelling, and the effects of high accuracy, high automation and use convenience are achieved.
Description
Technical field
The present invention relates to a kind of temperature measuring equipment, particularly a kind of digital temperature measurement mechanism that is applicable to Transformer Winding.
Background technology
The thermal characteristics of Transformer Winding has determined load capacity and the insulation probable life thereof of power transformer, and this becomes Transformer Winding temperature affects the deciding factor of power transformer normal operation.Therefore grasp in time the winding temperature of transformer, significant to guaranteeing safety, the economical operation of transformer.Measuring transformer winding temperature is mainly to adopt mechanical type Transformer Winding temperature measuring equipment at present, by thermal simulation principle, measure approx Transformer Winding temperature, but be subject to the structural limitations of traditional mechanical pointer instrument, not only measuring accuracy is low for this mechanical type temperature measuring equipment, need often calibration, cannot accurately reflect winding temperature; And volume is bigger than normal, inconvenience is installed, automaticity is low, is not easy to operation, affects work efficiency.
Summary of the invention
The present invention mainly solves existing Transformer Winding temperature measuring equipment and is subject to structural limitations cannot accurately measure winding temperature, automaticity is low, be not easy to the technical matterss such as operation, the Transformer Winding that a kind of measuring accuracy is high, automaticity is high, easy to install temperature measuring equipment is provided.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals:
The present invention includes for the output current current transformer of measuring transformer indirectly; The average temperature rising reaching after thermal equilibrium for winding is related to computing module; For calculating the thermal simulation computing module of Current Temperatures side-play amount; For setting the response time setting module of thermal response time; For calculating the additional calculation module of winding temperature; The oil temperature sensor that is used for the top-oil temperature of measuring transformer; And show and control module for the temperature of exporting result of calculation and realizing relevant control;
It is characterized in that: current transformer is connected with being related to computing module, be related to that computing module is connected with thermal simulation computing module, thermal simulation computing module, oil temperature sensor and temperature show and are connected with additional calculation module respectively with control module; Response time setting module connects thermal simulation computing module.
Further, the computing formula that is related to computing module is: Δ T=a
0+ a
1* I
t+ a
2* I
t 2, wherein: a
0=-0.592166414611468,
a
1＝1.92532306426727E-03，
a
2＝1.72397453373464E-05。
Further, the difference equation of thermal simulation computing module is:
Y(n)＝aΔT(n)+(1-a)Y(n-1)
Wherein, Δ T (n) is the current corresponding stable state average temperature rising of transformer output current, and Y (n) is current temperature offset amount; Temperature offset amount when Y (n-1) is last sampling; A is the relevant parameter of response time of setting to response time setting module.
Further, additional calculation module is according to formula: T
r=T
0+ Y (n), calculates Transformer Winding temperature.
The invention has the beneficial effects as follows: by Transformer Winding Temperature Rise characteristic is carried out to mathematical modeling, the method of utilizing software to calculate reaches the object of thermal simulation, make full use of microprocessor technology, improve the problems such as large, the difficult operation of original method for measuring temperature of transformer winding error, reach that reliability is high, automaticity is high, operation and maintenance is convenient, the effect of long service life.
Accompanying drawing explanation
The principle of work block diagram that accompanying drawing 1 is digital transformer winding temperature measuring device;
Accompanying drawing 2 well heater typical temperature increase curves;
Accompanying drawing 3 thermal simulation characteristic-temperature rises and electric stream correspondence table;
The step response curve of accompanying drawing 4 first-order systems;
The software flow pattern of accompanying drawing 5 Transformer Winding temperature surveys, calculating.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is done more specifically bright.
As shown in Figure 1, digital transformer winding temperature measuring device is to utilize mathematical modeling to realize thermal simulation effect.Current transformer 1 is connected with transformer, for the output current of measuring transformer indirectly.Electric current to current transformer 1 output is measured, and obtains a watt current value being directly proportional to transformer load, and offers and be related to computing module 2.Be related to that computing module 2 is calculated and realized by microprocessor software, according to the electric current of current transformer 1 output and the corresponding relation of temperature rise, when calculating transformer is exported certain current value, winding reaches the average temperature rising after thermal equilibrium.Thermal simulation computing module 3 has been calculated by microprocessor software equally, and according to the temperature characteristic of transformer, the thermal response time constant according to being related to that the resulting current transformer average temperature rising of computing module 2 and user set, calculates current temperature offset amount.Oil temperature sensor 4 adopts thermistor, as the thermal resistance PT100 of armouring, for the top-oil temperature of measuring transformer.5 pairs of above-mentioned the data obtaineds of additional calculation module are integrated processing, calculate winding temperature.Response time setting module 6 is for setting thermal response time.Temperature shows to control module 7 for exporting result of calculation and realizing relevant control, as cooling, the control etc. of tripping.
Further, current transformer 1 is connected with being related to computing module 2, is related to that computing module 2 is connected with thermal simulation computing module 3, and thermal simulation computing module 3, oil temperature sensor 4 and temperature show and be connected with additional calculation module 5 respectively with control module 7; Response time setting module 6 connects thermal simulation computing module 3.
Referring to accompanying drawing 1, the principle of work of digital transformer winding temperature measuring device of the present invention is:
By measuring transformer reservoir temperature, the temperature offset amount relevant with transformer output current that superposes, as the average temperature value of Transformer Winding.Use thermal simulation principle, according to the regulation of IEC354 < < transformer load guide rule > >, oil-immersed power transformer winding temperature T
rcan be equivalent to:
T
r＝T
0+K
i?
ΔT
Be that hot spot temperature of winding is additional temperature rise
Δt and top-oil temperature T
0function.In formula
Δt is the additional temperature rise that thermal cycle simulation provides, K
ifor the focus coefficient relevant with transformer device structure.T in formula
0can use oil temperature sensor 4 to obtain, its principle is to utilize the variation of thermistor induction top-oil temperature, and this technology is very ripe, can realize with the thermal resistance PT100 of armouring.In other words, if record the additional temperature rise that thermal cycle simulation provides
Δt, also just can draw hot spot temperature of winding T
r.
On transformer belt, during load, because the output current of transformer is excessive, in actual applications, generally by current transformer, carry out the output current of indirect measuring transformer.On transformer belt, after load, the electric current being directly proportional to its load is through current transformer 1 conversion, to being related to that computing module 2 provides a current signal I
t.
The principle of work that is related to computing module 2 is: referring to accompanying drawing 3, and when stipulating the extra current of current transformer output 0.5A～5A in national sector standard JB/T8450-2005, the corresponding form of additional temperature rise that thermal cycle simulation produces.According to this temperature rise and electric stream correspondence table, can determine the average temperature rising Δ T that thermal cycle simulation produces.By least square method, can simulate additional temperature rise Δ T and output current of converter I
tmathematic(al) representation, be the operational formula that is related to computing module 2:
ΔT＝a
0+a
1×I
t+a
2×I
t 2
Wherein: a0=-0.592166414611468,
a1＝1.92532306426727E-03，
a2＝1.72397453373464E-05。
By response time setting module 6, set response time and the sampling period of thermal simulation, by thermal simulation computing module 3, calculate the temperature offset amount of thermal simulation system.
The principle of work of thermal simulation computing module 3 is: by mathematical modeling mode, according to first-order system principle, by the electric current I of transformer
h, the parameter such as average temperature rising Δ T and the relation of time carry out mathematical modeling, by microprocessor, calculates current winding additional temp side-play amount.Referring to accompanying drawing 2, are typical well heater temperature rise curves while adding the electric current of fixed size.Analyze this curve, can find that itself and first-order system have approximate characteristic.In the present invention, adopt first-order lag responding system to describe the mathematics model of heater of analogue transformer heating in winding.The transport function in first-order system S territory is:
If n is systematic sampling time number variable, the difference equation of thermal simulation computing module 3 is:
Y(n)＝a?X(n)+(1-a)Y(n-1)
Wherein, X (n) is the current corresponding stable state average temperature rising of transformer output current, i.e. Δ T value during the n time sampling, and Y (n) is current temperature offset amount; Temperature offset amount when Y (n-1) is last sampling.
In above-mentioned formula, a is the relevant parameter of response time of setting to response time setting module 6, and the time constant of establishing first-order system is τ, and the sampling period is Ts, according to first-order system function, has:
Step response curve referring to accompanying drawing 4 first-order systems is known, and when time t is 4 τ, output valve is steady-state value 98.2%, can be similar to as steady-state response value; If the temperature rise response time of first-order system is Γ, there is Γ=4 τ; Owing to requiring thermal simulation time constant to be not more than 9min in national sector standard JB/T 8450-2005, i.e. 540s, therefore have Γ≤540s, τ≤135s.
Further, establishing sampling rate is Fs, and the closed-loop bandwidth of single order responding system is F
bW, according to the practical experience of technology and cost, in actual applications, the closed-loop bandwidth F that selects sampling rate to be greater than 20 times
bWcomparatively reasonable, i.e. Fs > 20F
bW; Because Ts=1/Fs, so have:
System for a rise time is Γ, can obtain closed-loop bandwidth F
bWfor
?
the reasonable value scope that therefore can obtain sampling period Ts is Ts < 0.4 τ, i.e. Ts < 54s; Consider the display refresh rates of measurement result and control the factors such as reaction velocity of exporting, generally Ts being decided to be to 1s.
By response time control module 6, determine after response time τ and sampling period Ts, can calculate the concrete numerical value of parameter a.
Because oil-immersed power transformer winding average temperature value is: transformer oil reservoir temperature, a temperature offset amount relevant with transformer output current superposes.Utilize additional calculation module, calculating transformer winding average temperature value, this computing formula is: T
r=T
0+ Y (n).The numerical value that calculates gained is shown and control module 7 outputs by temperature, and is regulated and controled.
Thermal simulation system in the present invention adopts microprocessor to realize.Be related to computing module 2 and thermal simulation computing module 3 as shown in Figure 1 adopt microprocessor technology, and related data is carried out to analyzing and processing.The software flow of winding temperature measurement, calculating section as shown in Figure 5.Utilize the present invention can reach adjusting, easy to use, precision is high, does not need frequent calibration, and automaticity is high, and the response time is adjustable, the little effect of drifting about.
Claims (4)
1. a digital transformer winding temperature measuring device, is characterized in that, comprising:
Be related to computing module, for calculating winding, reach the average temperature rising after thermal equilibrium, be describedly related to that computing module connects the current transformer for indirect measuring transformer output current;
Response time setting module, for setting thermal response time;
Temperature shows and control module, for exporting result of calculation and realizing relevant control;
Thermal simulation computing module, for the side-play amount of calculating transformer Current Temperatures, described thermal simulation computing module annexation computing module and response time setting module;
Additional calculation module, for calculating the winding temperature of current transformer, described additional calculation module connects thermal simulation computing module, the oil temperature sensor for measuring transformer top-oil temperature, temperature demonstration and control module.
2. digital transformer winding temperature measuring device as claimed in claim 1, is characterized in that: the computing formula that is related to computing module is: Δ T=a
0+ a
1* I
t+ a
2* I
t 2,
Wherein: the additional average temperature rising that Δ T provides for current transformer analogue transformer output current, I
tfor output current of converter;
a
0=-0.592166414611468，
a
1=1.92532306426727E-03，
a
2=1.72397453373464E-05。
3. digital transformer winding temperature measuring device as claimed in claim 2, is characterized in that: the difference equation of thermal simulation computing module is:
Y(n)=aΔT(n)+(1-a)Y(n-1)
Wherein, the additional average temperature rising that Δ T (n) provides for current current transformer analogue transformer output current, Y (n) is current temperature offset amount; Temperature offset amount when Y (n-1) is last sampling; A is the relevant parameter of response time of setting to response time setting module.
4. digital transformer winding temperature measuring device as claimed in claim 3, is characterized in that: additional calculation module is according to formula: T
r=T
0+ Y (n), calculates Transformer Winding temperature;
Wherein, T
rfor Transformer Winding temperature, T
0for top-oil temperature, Y (n) is current temperature offset amount.
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|---|---|---|---|
| CN201110251581.2A CN102288316B (en) | 2011-08-29 | 2011-08-29 | Digital transformer winding temperature measuring device |
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|---|---|---|---|
| CN201110251581.2A CN102288316B (en) | 2011-08-29 | 2011-08-29 | Digital transformer winding temperature measuring device |
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| CN102288316A CN102288316A (en) | 2011-12-21 |
| CN102288316B true CN102288316B (en) | 2014-02-12 |
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| CN102890518B (en) * | 2012-07-04 | 2015-07-22 | 航天科工惯性技术有限公司 | Method and system for analyzing accelerometer temperature control system |
| CN103961066B (en) * | 2013-01-24 | 2015-12-23 | 重庆融海超声医学工程研究中心有限公司 | A kind of temp measuring method and temperature measuring equipment |
| CN103175632B (en) * | 2013-03-05 | 2015-09-09 | 福州大学 | Electrical equipment real-time temperature calculation method and protective device |
| CN104316207B (en) * | 2014-10-31 | 2017-02-15 | 国家电网公司 | Winding temperature real-time monitoring device and method used in transformer temperature rise test |
| CN104330693B (en) * | 2014-11-24 | 2018-07-03 | 华北电力大学（保定） | The temperature and method for detecting position of hot spot in a kind of dry-type transformer winding |
| CN104914310B (en) * | 2015-03-10 | 2018-04-24 | 国网四川省电力公司电力科学研究院 | The temperature resistance curve of distribution transformer winding obtains device and method |
| CN113035561B (en) * | 2020-12-07 | 2022-11-22 | 广西电网有限责任公司电力科学研究院 | Oil pressure measurement-based transformer winding oil flow balance design method |
| CN114964548A (en) * | 2022-03-21 | 2022-08-30 | 南京智鹤电子科技有限公司 | Transformer oil temperature monitoring method |
| CN115756026A (en) * | 2022-11-30 | 2023-03-07 | 广西电网有限责任公司电力科学研究院 | System and method for controlling temperature of transformer winding |
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| CN2569119Y (en) * | 2002-09-18 | 2003-08-27 | 新疆特变电工股份有限公司 | On-line monitor for hot-spot temp of transformer winding |
| JP4341232B2 (en) * | 2002-11-15 | 2009-10-07 | ダイキン工業株式会社 | Temperature increase control method and apparatus for autonomous inverter-driven hydraulic unit |
| US7318004B2 (en) * | 2005-04-01 | 2008-01-08 | Cardinal Health 303, Inc. | Temperature prediction system and method |
| US7556423B2 (en) * | 2007-01-08 | 2009-07-07 | Microchip Technology Incorporated | Temperature sensor bow compensation |
| CN101162172A (en) * | 2007-11-16 | 2008-04-16 | 王世有 | Transformer winding temperature gage |
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Denomination of invention: Digital transformer winding temperature measuring device Effective date of registration: 20181128 Granted publication date: 20140212 Pledgee: Hangzhou United Rural Commercial Bank, Limited by Share Ltd branch of science and technology Pledgor: Hangzhou Honcen Technology Co., Ltd. Registration number: 2018330000417 |