CN106404190A - Novel line temperature transmission device - Google Patents
Novel line temperature transmission device Download PDFInfo
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- CN106404190A CN106404190A CN201610796113.6A CN201610796113A CN106404190A CN 106404190 A CN106404190 A CN 106404190A CN 201610796113 A CN201610796113 A CN 201610796113A CN 106404190 A CN106404190 A CN 106404190A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The present invention discloses a novel line temperature transmission device used for leading the current of the secondary winding of a CT (current transformer) to a heating resistor loop in line temperature measurement of the power transformer. The device includes a current acquisition module for acquiring the current of the secondary winding of the CT, a control circuit and an alternating-current constant current source circuit for leading output current to the heating resistor loop; the control circuit comprises a central processing unit and a liquid crystal display module; the alternating-current constant current source circuit is connected with the central processing unit through a serial communication circuit; the current acquisition module is connected with the central processing unit; and the liquid crystal display module is connected with the central processing unit. According to the novel line temperature transmission device of the invention, a current acquisition sensor is adopted to acquire the current of the secondary winding; the central processing unit processes acquired current data and communicates with the alternating-current constant current source circuit so as to control the magnitude of output current, so that the output current of the alternating-current constant current source circuit and acquired input current can be synchronous and consistent, and therefore, the risk of the open circuiting of the secondary winding of the CT can be lowered, and the stability of a transformer system can be improved.
Description
Technical field
The present invention relates to line temperature pick-up device and in particular to during a kind of power transformer line temperature measurement secondary winding electric current survey
The line temperature pick-up device of temperature.
Background technology
At present, the electric current of the mode of power transformer line temperature measurement predominantly CT Secondary Winding flows through adding thermal resistance to oil temperature
Compensate, after conversion, obtain the line temperature of transformator.Because this kind of metering system is connected access in the Secondary Winding loop of CT
Resistance, and the change of current become around environmental aspect more severe, there is the risk that resistance burns in longtime running, cause CT bis- times around
Group open circuit, threatens the safe operation of transformator.Temperature survey principle for winding all adopts oil temperature substantially both at home and abroad at present
Plus the Current calculation temperature superimposition of CT Secondary Winding calculates and obtains, schematic diagram such as Fig. 1, it is mainly on the basis of an oil temperature gauge
On, it is equipped with a current matching device and a heating.The sensor of thermometer --- thermometer bulb is inserted in transformer oil box top
Oilhole in, when transformer load is zero, the reading of winding temperature gage is the temperature of oil tank of transformer top layer pasta.Work as transformation
After load on device band, the electric current being directly proportional to load that taken out by transformer current transformer, after current matching device adjustment
Flow through the heating being inlaid in corrugated tube, heating produces heat, so that the gas in corrugated tube is expanded further, meter
The displacement of flexible member increases.Therefore, after load on transformer belt, the displacement of flexible member is by transformator top layer oil
Both load currents of gentle transformator are determined.CT is protected for the fusing preventing heating or current matching device resistance
Secondary circuit is not opened a way and be there is no correlational study at present.
Content of the invention
For the deficiencies in the prior art, the present invention provides a kind of Novel wire temperature pick-up device, as preventing CT Secondary Winding
The Optimized Measures of open circuit, reduce the risk of CT Secondary Winding open circuit simultaneously.
To achieve these goals, the present invention adopts the technical scheme that：
A kind of Novel wire temperature pick-up device, for drawing CT secondary winding electric current to heating during power transformer line temperature measurement
Resistance loop, described Novel wire temperature pick-up device includes：For gathering the current acquisition module of CT secondary winding electric current, controlling electricity
Road and so that output current to lead to the alternating-current constant-current source circuit in adding thermal resistance loop, control circuit includes central processing unit and liquid
Brilliant display module,
Wherein, alternating-current constant-current source circuit is connected by serial communication circuit with central processing unit, by central processing unit control
System adjusts the input current of alternating-current constant-current source circuit and the data of the output current of alternating-current constant-current source circuit is transferred to central authorities' process
Device；
Current acquisition module is connected with central processing unit, central processing unit is processed the electric current of current acquisition module collection
Data；
LCD MODULE is connected with central processing unit, shows the electric current of current acquisition module collection with LCD MODULE
The data of data and the output current exchanging permanent source circuit.
Described LCD MODULE is TFTLCD module.
Described current acquisition module includes current acquisition sensor, quantization modules circuit, wherein current acquisition sensor
Export after connecting quantization modules circuit after collection secondary winding electric current.
Described alternating-current constant-current source circuit, including DC power supply module, sine wave module, waveform filtration module, perseverance
Stream tracker, power amplifier, current sampling circuit and microcontroller, wherein DC power supply module is sequentially connected sine wave
Export after module, waveform filtration module, constant current tracker, power amplifier and current sampling circuit, described current sampling is electric
The outfan on road is simultaneously connected with described constant current tracker and microcontroller, and described microcontroller connects sine wave module and perseverance
Stream tracker, central processing unit is connected with microcontroller by serial communication circuit.
Described central processing unit is STM32 chip, inexpensive, and powerful, it is easy to extension, can carry for whole system
, so that circuit is simply it is easy to integrated, maintenance cost is low for high stability.
Described serial communication circuit is RS-232 serial communication circuit.
Described DC power supply module is the Switching Power Supply of multiple-channel output, and the Switching Power Supply of finished product has plurality of voltages
Output, the efficiency of design is high, good stability, carries overvoltage, overcurrent protection, Switching Power Supply band protection shell uses
More safely it is easy to install application to save the development time, save development cost, electric using simply can greatly simplify hardware
The design complexities on road.
Compared with prior art, the beneficial effects of the present invention is：
1. the present invention solves power system CT Secondary Winding open circuit well, threatens the asking of safe operation of transformator
Topic.It is not result in harm when CT secondary circuit open circuit occurs, transformator continues to run with, only need to individually keep in repair Novel wire of the present invention
The loop of warm pick-up device just can return to normal operating condition.The failure effect that single element fault causes greatly reduces,
Ensure that the stability of system operation.When single element fault moment is changed to this element rapidly, when reducing upkeep operation
Between, improve service work efficiency；Because circuit transformer line temperature measurement most of in electrical network takes CT secondary winding electric current stream
Cross adding thermal resistance oil temperature is compensated, obtain the line temperature thermometric pattern of transformator after conversion, therefore, extensively can enter in electrical network
Row is promoted it is ensured that the stability of system operation.
2. the present invention adopts the size of current of contactless current acquisition sensor acquisition CT Secondary Winding, using central authorities
The current data that processor process collects, then communicated with alternating-current constant-current source circuit by serial communication circuit, exchange is permanent
Current source circuit passes through microprocessor controls output current size, thus reaching the output current of alternating-current constant-current source circuit and collecting
The synchronously consistent effect of input current, and show the defeated of the input current collecting and alternating-current constant-current source circuit on a display screen
Go out size of current, be subsequently used for extraction CT secondary winding electric current and carry out thermometric to adding thermal resistance loop, thus reducing CT bis-
The risk of secondary winding open circuit, improves the stability of voltage transformer system.The system makes the accident of whole voltage transformer system greatly contract
Little, mitigate the burden of maintenance crew.
Brief description
Fig. 1 is the thermometric schematic diagram of prior art transformer secondary winding；
Fig. 2 is the principle schematic of the present invention；
Fig. 3 is the principle schematic of alternating-current constant-current source circuit of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
As Fig. 2, a kind of Novel wire temperature pick-up device, for drawing CT secondary winding electric current during power transformer line temperature measurement
To adding thermal resistance loop, described Novel wire temperature pick-up device includes the current acquisition of the current data for gathering CT Secondary Winding
Module 1, control circuit and alternating-current constant-current source circuit 3, wherein control circuit include the electric current for exporting current acquisition module 1
The central processing unit 2 of the input current of alternating-current constant-current source circuit is controlled to adjust after data is processed and by serial communication circuit
With LCD MODULE 4, central processing unit 2 is connected with LCD MODULE 4, and current acquisition module 1 is gathered by central processing unit 2
Current data be transferred to LCD MODULE 4 with the output current exchanging permanent source circuit 3, LCD MODULE 4 shows electric current
The current data of acquisition module 1 collection and the output current exchanging permanent source circuit 3.
Described LCD MODULE 4 is TFTLCD module, and TFTLCD module is brightness, contrast, stereovision be strong, color
The aspect performance such as bright-coloured is good, has faster speed, be advantageously implemented more preferable display effect when transmission big data.
TFTLCD module shows with the output current exchanging permanent source circuit 3 to the secondary winding electric current collecting, and monitoring at any time is originally
The ruuning situation of system, can find fault as early as possible, allow accident to reduce and occur, and the generation putting forth effort on reduction electric power system fault is general
Rate.
Described current acquisition module 1 includes current acquisition sensor, quantization modules circuit, wherein current acquisition sensor
Output after quantization modules circuit, current acquisition sensor and traditional collection current data side is connected after collection secondary winding electric current
Formula is different, using contactless current acquisition sensor acquisition, does not affect work for the circuit needing measurement, have electrically every
From effect, do not directly contact high pressure have the characteristics that high accuracy safety.Current acquisition sensor acquisition is to the number of electric current
According to, become 0-5V voltage through quantization modules circuit conversion, quantization modules circuit has very high degree of accuracy and response speed, and
Stability very well, can be calibrated by micro potentiometer by existing temperature drift.As embodiment, quantization modules circuit can
Using SX-AC-A series, this series is the accurate quantization modules of alternating current, has 4 kinds of ranges available, respectively 5A, 10A,
20A, 50A, in the present invention, alternating current precision quantization modules can be selected for the SX-AC-A05 module that model range is 5A.
As Fig. 3, described alternating-current constant-current source circuit 3, including DC power supply module, sine wave module 6, waveform filtering
Module 7, constant current tracker 8, power amplifier 9, current sampling circuit 10 and microcontroller 11, wherein DC power supply module
It is sequentially connected defeated after sine wave module 6, waveform filtration module 7, constant current tracker 8, power amplifier 9 and current sampling circuit 10
Go out, described current sampling circuit 10 is acquired to output current, the outfan of current sampling circuit 10 is simultaneously connected with described
Constant current tracker 8 and microcontroller 11, the output current data negative feedback that current sampling circuit 10 collects to constant current follow the tracks of
Device 8, to reach the purpose of constant output current.Central processing unit 2 is connected with microcontroller 11 by serial communication circuit, micro-control
Device 11 processed passes through sine wave module 6 and constant current tracker 8 controls output current size, thus it is defeated to reach alternating-current constant-current source circuit 3
The effect that to go out electric current synchronously consistent with the secondary winding electric current collecting, reduces the risk of CT Secondary Winding open circuit simultaneously.
Described DC power supply module is the Switching Power Supply 5 of multiple-channel output, and the Switching Power Supply 5 of finished product has Multi-path electricity
Pressure output, the efficiency of design is high, good stability, carries overvoltage, overcurrent protection, Switching Power Supply 5 band protection shell
Save the development time using more safety it is easy to install application, save development cost, hard using simply can greatly simplify
The design complexities of part circuit.
As an embodiment, Switching Power Supply 5 is the DC voltage that a constant pressure source exports 14v, by sine wave module 6
Produce concussion and be transformed into standard sine wave, because produced sine wave can be mingled with harmonic wave, so mould will be filtered through waveform
Useless waveform is removed by block 7, is left the waveform of required frequency and amplitude, then is amplified by 9 signals of power amplifier, energy
Output is enough allowed to have load capacity.Current sampling circuit 10 gathers the size of output current, and passes to constant current tracker 8, root
According to the principle automatically controlling, real-time adjustment is carried out to output current, to reach the effect of constant output current.
Described central processing unit is STM32 chip, inexpensive, and powerful, it is easy to extension, can carry for whole system
, so that circuit is simply it is easy to integrated, maintenance cost is low for high stability.
Described serial communication circuit is RS-232 serial communication circuit, and the communication requirement of the present invention is full duplex transmission,
Less, rate request is not also high, and the distance between two modules are also close for data volume, using RS-232 serial communication circuit, accords with
Close the requirement of the present invention, and later extension can be facilitated.
Current acquisition sensor carries out accurate acquisition data to secondary winding electric current, and STM32 chip is to the data collecting
Communicate with the microcontroller 11 in alternating-current constant-current source circuit 3, by microcontroller after being processed and by serial communication circuit
The output current size of 11 regulation alternating-current constant-current source circuits 3, using the output current of alternating-current constant-current source circuit 3 as power transformer
CT secondary winding electric current thermometric draw, even if also unaffected when secondary circuit is opened a way.
The accuracy of checking system result can be gone by the following method, prepare an AC electric appliance that can finely tune such as
Loop to be tested is first connected circuit tester and gear is reached measurement electric current gear, by alternating-current constant-current source circuit 3 by big bulb
Outfan be connected to circuit tester, and get to measurement voltage gear, after everything in readiness be energized, observe two circuit testers number
Value, judges whether to meet required precision, adjusts the output size of test loop again, then observes the reading of two circuit testers again
Whether number meets the requirements, if precision does not reach expected effect, adjusts the resistance quantifying resistance, precision is adjusted to
Design requirement.Measuring accuracy synopsis after the completion of debugging such as table 1.
Table 1：Measuring accuracy synopsis
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment simultaneously is not used to limit this
Bright the scope of the claims, all equivalence enforcements done without departing from the present invention or change, are intended to be limited solely by the scope of the claims of this case.
Claims (7)
1. a kind of Novel wire temperature pick-up device, for drawing CT secondary winding electric current to heating electricity during power transformer line temperature measurement
Resistance loop is it is characterised in that described Novel wire temperature pick-up device includes：For gathering the current acquisition mould of CT secondary winding electric current
Block (1), control circuit and output current to be led to the alternating-current constant-current source circuit (3) in adding thermal resistance loop, control circuit bag
Include central processing unit (2) and LCD MODULE (4), wherein：
Alternating-current constant-current source circuit (3) is connected by serial communication circuit with central processing unit (2), and central processing unit (2) is controlled
During the data of the output current of the input current of system regulation alternating-current constant-current source circuit (3) and alternating-current constant-current source circuit (3) is transferred to
Central processor (2)；
Current acquisition module (1) is connected with central processing unit (2), processes current acquisition module (1) collection by central processing unit (2)
Current data；
LCD MODULE (4) is connected with central processing unit (2), is adopted with LCD MODULE (4) display current acquisition module (1)
Collection current data and exchange perseverance source circuit (3) output current data.
2. a kind of Novel wire temperature pick-up device according to claim 1 is it is characterised in that described LCD MODULE
(4) it is TFTLCD module.
3. a kind of Novel wire temperature pick-up device according to claim 1 is it is characterised in that described current acquisition module
(1) current acquisition sensor, quantization modules circuit, wherein connection amount after current acquisition sensor acquisition secondary winding electric current are included
Export after changing modular circuit.
4. a kind of Novel wire temperature pick-up device according to claim 1 is it is characterised in that described alternating-current constant-current source circuit
(3), including DC power supply module, sine wave module (6), waveform filtration module (7), constant current tracker (8), power amplification
Device (9), current sampling circuit (10) and microcontroller (11), wherein DC power supply module is sequentially connected sine wave module
(6), output current to after waveform filtration module (7), constant current tracker (8), power amplifier (9) and current sampling circuit (10)
Adding thermal resistance loop, the outfan of described current sampling circuit (10) connects described constant current tracker (8) and microcontroller
(11), described microcontroller (11) connects sine wave module (6) and constant current tracker (8), and central processing unit (2) passes through serial ports
Telecommunication circuit is connected with microcontroller (11).
5. a kind of Novel wire temperature pick-up device according to claim 1 is it is characterised in that described central processing unit is
STM32 chip.
6. a kind of Novel wire temperature pick-up device according to claim 1 is it is characterised in that described serial communication circuit is
RS-232 serial communication circuit.
7. a kind of Novel wire temperature pick-up device according to claim 4 is it is characterised in that described DC power supply mould
Block is the Switching Power Supply (5) of multiple-channel output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610796113.6A CN106404190B (en) | 2016-08-31 | 2016-08-31 | Novel line temperature transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610796113.6A CN106404190B (en) | 2016-08-31 | 2016-08-31 | Novel line temperature transmitting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106404190A true CN106404190A (en) | 2017-02-15 |
| CN106404190B CN106404190B (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610796113.6A Active CN106404190B (en) | 2016-08-31 | 2016-08-31 | Novel line temperature transmitting device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417184Y (en) * | 2009-04-23 | 2010-03-03 | 广东美的电器股份有限公司 | two-wire temperature transmitter |
| CN104568195A (en) * | 2014-12-31 | 2015-04-29 | 上海自动化仪表股份有限公司 | Functional safety temperature transmitter |
| CN204575211U (en) * | 2015-03-09 | 2015-08-19 | 尹孝贵 | A kind of temperature transmitter |
| CN205426376U (en) * | 2015-12-17 | 2016-08-03 | 中国地质大学（武汉） | Long -range wireless programme -controlled intelligent temperature transmitter |
| CN206177466U (en) * | 2016-08-31 | 2017-05-17 | 中国南方电网有限责任公司超高压输电公司广州局 | Novel line temperature becomes to be sent device |
-
2016
- 2016-08-31 CN CN201610796113.6A patent/CN106404190B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417184Y (en) * | 2009-04-23 | 2010-03-03 | 广东美的电器股份有限公司 | two-wire temperature transmitter |
| CN104568195A (en) * | 2014-12-31 | 2015-04-29 | 上海自动化仪表股份有限公司 | Functional safety temperature transmitter |
| CN204575211U (en) * | 2015-03-09 | 2015-08-19 | 尹孝贵 | A kind of temperature transmitter |
| CN205426376U (en) * | 2015-12-17 | 2016-08-03 | 中国地质大学（武汉） | Long -range wireless programme -controlled intelligent temperature transmitter |
| CN206177466U (en) * | 2016-08-31 | 2017-05-17 | 中国南方电网有限责任公司超高压输电公司广州局 | Novel line temperature becomes to be sent device |
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| Publication number | Publication date |
|---|---|
| CN106404190B (en) | 2019-12-20 |
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