CN204479197U - A kind of acquisition system of electric equipment temperature rise test data - Google Patents
A kind of acquisition system of electric equipment temperature rise test data Download PDFInfo
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- CN204479197U CN204479197U CN201520109216.1U CN201520109216U CN204479197U CN 204479197 U CN204479197 U CN 204479197U CN 201520109216 U CN201520109216 U CN 201520109216U CN 204479197 U CN204479197 U CN 204479197U
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Abstract
The utility model discloses a kind of acquisition system of electric equipment temperature rise test data, comprise power module, temperature sensor, data acquisition A/D conversion processing module, communication module and PC; Power module is connected with data acquisition A/D conversion processing module, communication module respectively, temperature sensor is connected with data acquisition A/D conversion processing module input end, data acquisition A/D conversion processing module output terminal is connected with communication module, and communication module output terminal is connected with PC by data line.Temperature sensor is thermopair, use thermopair sampling can accurate acquisition data, sampled value is sent to PC after being changed by A/D, by PC record and management each test figure, only by the temperature measurement value gathered in 1-2 thermal time constant time, just can according to the mathematical model of set up electric equipment current-carrying heating and accuracy requirement, calculating obtains temperature accurately and rises to stable temperature prediction value, save experimentation cost, have good using value.
Description
Technical field
The utility model belongs to electrical equipment, relates to the detection system of electrical equipment, is specifically related to a kind of acquisition system of electric equipment temperature rise test data.
Background technology
The temperature rise test of electric equipment is the pilot project that product approval must be carried out.In research and development of products, particularly for complicated and big current electric equipment, for obtaining the heating and radiator structure optimized, often to carry out a large amount of research temperature rise tests to different designs scheme, comparing.At present, temperature rise test harvester many employings single-chip microcomputer is the system of core, main output unit is a mini-printer, can only export by random printing, the overall process of temperature rise variation tendency can not be recorded, effectively can not manage the historical data of each test, for comprehensive analysis, particularly can not carry out forecast analysis, test period must reach 5 ~ 6 thermal time constant above times and just can record stable temperature rise, and process of the test is lost time and the energy.
Utility model content
In order to solve the problems referred to above that prior art exists, the utility model provides a kind of acquisition system of electric equipment temperature rise test data.
The technical scheme that the utility model adopts is: a kind of acquisition system of electric equipment temperature rise test data, comprises power module, temperature sensor, data acquisition A/D conversion processing module, communication module and PC; Power module is connected by wire with data acquisition A/D conversion processing module, communication module respectively, the output terminal of temperature sensor is directly connected with the input end of data acquisition A/D conversion processing module, the output terminal of data acquisition A/D conversion processing module is connected with the input end of communication module by wire, and the output terminal of communication module is connected with PC by data line.
Described temperature sensor is T-shaped thermopair.
Described data acquisition A/D conversion processing module adopts unit and connects expanded type.
The communications protocol of described communication module is input end RS485, output terminal RS232.
The beneficial effects of the utility model are: the utility model is used for collection and the analysis of electric equipment temperature rise data, thermopair is used to sample as temperature sensor, sampled value is communicatively sent to PC after becoming digital signal by A/D conversion, can accurate acquisition data, by PC record and management each test figure, and the analysis tool that PC provides, in test only by the temperature measurement value in 1 ~ 2 the thermal time constant time of collection, just can set up the computation model of electric equipment current-carrying heating and meet the mathematical model of accuracy requirement, temperature rise situation of change according to tested beginning a period of time record carrys out predict device temperature variation to stable temperature rise value, obtain the stable temperature rise predicted value meeting accuracy requirement, save experimentation cost, there are good using value and economic implications.
Accompanying drawing explanation
Fig. 1. be structural representation of the present utility model.
Embodiment
As shown in Figure 1, a kind of acquisition system of electric equipment temperature rise test data, comprises power module, temperature sensor, data acquisition A/D conversion processing module, communication module and PC; Power module is powered to data acquisition A/D conversion processing module and communication module, the output terminal of described temperature sensor is connected by wire with data acquisition A/D conversion processing module input end, the output terminal of data acquisition A/D conversion processing module is connected with the input end of communication module by wire, and the output terminal of communication module is connected with PC by data line; The communications protocol of described communication module is input end RS485, output terminal RS232.Described temperature sensor is T-shaped thermopair.Described data acquisition A/D conversion processing module adopts unit and connects expanded type, can meet multi-route measuring temperature requirement.
The preferred T-shaped thermopair of the utility model temperature sensor, T-shaped thermocouple probes material is copper (C
u)--copper nickel (C
u45N
i55), during temperature 100 degree, voltage difference is 4.277 millivolts, and measuring range I level is-40 ~ 350 degree, and III level is-200 ~ 40 degree, has the linearity good, and thermopower is comparatively large, and sensitivity is higher, and stability and homogeneity better, can be applied in 300 degree with lower area.During use, T-shaped thermopair contacts with measured point, two kinds of electrode materials of thermopair can produce corresponding potential difference (PD) at different temperatures, T-shaped thermopair contacts with measured point and produces corresponding potential difference (PD), T-shaped thermocouple temperature measurement exports millivolt step voltage amount to data acquisition A/D conversion processing module and does A/D conversion, data acquisition A/D conversion processing module is that 8 tunnels form a unit, and communication module can be accessed by multiple unit, data acquisition A/D conversion processing module is converted to digital signal the simulating signal collected, temperature value is scaled for T-shaped thermopair output voltage and vs. temperature according to what set in advance, pass again and export communication module to toward communication port, communications protocol is RS-232, RS-232 is transferred to RS-485 by isolated form communication conversion module, signal transfers to PC by communication module and carries out analyzing and processing, according to the temperature rise value recorded in 1-2 thermal time constant of electric equipment current-carrying heating process, set up electric equipment current-carrying heating mathematical model, accounting temperature rises to stable temperature prediction value, PC background system records image data and manages, data record and system of checking with KingView software for platform is developed.This system includes main interface, inventory interface, function interface three parts, real time data and process of the test temperature rise curve can be checked, check historical data and process of the test temperature rise curve, multiple spot test of many times data are compared, generates test report by the form of fixation, and be EXCEL formatted file the overall process temperature rise statistical conversion of any one measuring point or multi-measuring point.
In temperature rise test process, carry out the forecast analysis of stable temperature rise value, be based on electrical equipment under constant current-carrying and fixing radiating condition, its temperature ramp de has index curve feature to set up forecast model, and its principle is:
According to energy balance relations, for the heating of electrical equipment test product, there is following relation:
（1）
-current loop exists
the loss heat produced in time;
-conductor exists
heat required for heating up in time;
-conductor exists
the heat in surrounding medium is passed in time;
Above formula is variable to be changed to:
(2)
-heat flux, considers by constant.In fact temperature rise test is the thermal effect applying steady current, so heat flux is constant;
the thermal capacity of-conductor;
the temperature rise of-conductor.
（3）
initial temperature during the firm current-carrying of-equipment;
the temperature of-t.
Arrangement formula (2):
（4）
Solve:
（5）
Get
,
-stable state temperature rise [K];
-thermal time constant [s].
After substitution formula (5):
（6）
Formula (6) for the change curve of test product conductor measuring point temperature rise, this function be by stable state temperature rise
with conductor thermal time constant
determine.Be converted to temperature changing process, be then:
（7）
Wherein
for initial temperature, can be obtained by actual measurement.
for stable state temperature rise,
for conductor thermal time constant.
In test, can obtain a series of (t,
), for reducing global error, improve precision of prediction, prediction algorithm is not treated that initial temperature of record during initial loading current as initial characteristic values, in formula (7)
,
,
three eigenwerts all go to solve as unknown quantity.
Prediction and calculation process is, in test assesses thermal time constant at any time, and to determine to test the time that should at least carry out, ordinary test will carry out the time of 1.5 times of thermal time constants more than.The time interval of system log data is 0.5 second, altogether records the data volume of about 1.5 ~ 2 time constant time spans, and system adopts least square method and general Global Algorithm, carries out non-linear regression and curve, obtains the parameters such as expection stable temperature rise.This arithmetic accuracy reaches: mean square deviation (RMSE): 0.0997, residual sum of squares (RSS) (SSE): 0.3582 related coefficient (R): 0.9994.
Claims (4)
1. an acquisition system for electric equipment temperature rise test data, is characterized in that: comprise power module, temperature sensor, data acquisition A/D conversion processing module, communication module and PC; Power module is connected by wire with data acquisition A/D conversion processing module, communication module respectively, the output terminal of temperature sensor is directly connected with the input end of data acquisition A/D conversion processing module, the output terminal of data acquisition A/D conversion processing module is connected with the input end of communication module by wire, and the output terminal of communication module is connected with PC by data line.
2. the acquisition system of a kind of electric equipment temperature rise test data as claimed in claim 1, is characterized in that: described temperature sensor is T-shaped thermopair.
3. the acquisition system of a kind of electric equipment temperature rise test data as claimed in claim 1 or 2, is characterized in that: described data acquisition A/D conversion processing module adopts unit and connects expanded type.
4. the acquisition system of a kind of electric equipment temperature rise test data as claimed in claim 1 or 2, is characterized in that: the communications protocol of described communication module is input end RS485, output terminal RS232.
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| CN201520109216.1U CN204479197U (en) | 2015-02-15 | 2015-02-15 | A kind of acquisition system of electric equipment temperature rise test data |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093021A (en) * | 2015-08-11 | 2015-11-25 | 南方电网科学研究院有限责任公司 | Temperature rise test method for bridge arm reactor of modular multi-level current converter |
| CN107884088A (en) * | 2017-12-14 | 2018-04-06 | 株洲联诚集团控股股份有限公司 | A kind of warm-air drier Temperature Collection testing equipment based on PLC |
| CN107884614A (en) * | 2017-11-29 | 2018-04-06 | 曲阜师范大学 | A kind of current sensing means and electric current detecting method based on temperature detection |
| CN108267230A (en) * | 2018-01-30 | 2018-07-10 | 深圳市华检检测技术有限公司 | Temperature rises recorder and temperature rises acquisition method |
| CN113866536A (en) * | 2021-09-07 | 2021-12-31 | 深圳Tcl数字技术有限公司 | Temperature rise detection method and device and temperature rise detection system |
-
2015
- 2015-02-15 CN CN201520109216.1U patent/CN204479197U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093021A (en) * | 2015-08-11 | 2015-11-25 | 南方电网科学研究院有限责任公司 | Temperature rise test method for bridge arm reactor of modular multi-level current converter |
| CN105093021B (en) * | 2015-08-11 | 2018-06-19 | 南方电网科学研究院有限责任公司 | The temperature-raising experimental method of modularization multi-level converter bridge arm reactor |
| CN107884614A (en) * | 2017-11-29 | 2018-04-06 | 曲阜师范大学 | A kind of current sensing means and electric current detecting method based on temperature detection |
| CN107884088A (en) * | 2017-12-14 | 2018-04-06 | 株洲联诚集团控股股份有限公司 | A kind of warm-air drier Temperature Collection testing equipment based on PLC |
| CN108267230A (en) * | 2018-01-30 | 2018-07-10 | 深圳市华检检测技术有限公司 | Temperature rises recorder and temperature rises acquisition method |
| CN113866536A (en) * | 2021-09-07 | 2021-12-31 | 深圳Tcl数字技术有限公司 | Temperature rise detection method and device and temperature rise detection system |
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Granted publication date: 20150715 Termination date: 20160215 |
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