CN203323901U - Matcher of winding thermometer - Google Patents
Matcher of winding thermometer Download PDFInfo
- Publication number
- CN203323901U CN203323901U CN2013202621093U CN201320262109U CN203323901U CN 203323901 U CN203323901 U CN 203323901U CN 2013202621093 U CN2013202621093 U CN 2013202621093U CN 201320262109 U CN201320262109 U CN 201320262109U CN 203323901 U CN203323901 U CN 203323901U
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- winding temperature
- isolator
- winding
- chip microcomputer
- matcher
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Abstract
A matcher of a winding thermometer comprises a single-chip microprocessor, a secondary current input terminal, an input isolator, a pulse signal generator, an output isolator, an output control module, and a heating current output terminal. The matcher also comprises an oil surface temperature signal terminal, a winding temperature signal terminal, and a signal isolator. The matcher adopts the single-chip microprocessor to replace a matching resistor of a traditional winding thermometer and performs closed-loop control of a traditional thermal-simulation indirect temperature measurement. The matcher acquires the thermal-simulation winding temperature in real time and compares the thermal-simulation winding temperature with a winding temperature calculation value, and then the matcher automatically adjusts heating current and corrects an indication value of the winding thermometer in real time. Therefore, with the adoption of the matcher, the winding temperature measurement is guaranteed to be free of influence of environment temperature and matching resistor deterioration, and operation personnel and monitoring personnel can obtain an accurate winding temperature value.
Description
Technical field
The utility model belongs to the power system measuring technical field, specifically a kind of adaptation of oil-immersed power transformer winding temperature gage.
Background technology
At present, domestic and international most transformer station all adopts the method for winding temperature gage thermal simulation experiment indirectly to measure the winding temperature of oil-filled transformer.As shown in Figure 1, thermal simulation experiment be by the secondary current Ip of current transformer 1 output after adaptation 2 is adjusted, the heating current Is that output is directly proportional to load, the flow through heating element 3 of setting-in in winding temperature gage, the heat produced makes temperature sensing medium after-expansion occur, thereby make flexible member produce additional displacement, drive pointer and rotate to indicate winding temperature.
Yet find in actual use, winding temperature gage based on the indirect thermometric of thermal simulation experiment, the incorrect problem of measurement that existence causes because of variation of ambient temperature, its reason is that the heating process of heater element is to tap into row at the winding temperature gage internal direct, exist and outside process of carrying out heat interchange, when environment temperature is low, heating effect does not reach setting valve, and when environment temperature is higher, heating effect is again far beyond setting valve; The more important thing is, the adaptation of winding temperature gage, in the thermometric process, causes resistance value to raise because long-term continuous firing self-heating causes the adjusting contact oxidation, and shunting action reduces, and heating current further departs from normal value, thereby causes measuring incorrect.Therefore, the indicated value of winding temperature gage usually can't correctly reflect the running temperature of Transformer Winding, and winding temperature is to enter in real time supervisory system, dispatcher and operations staff monitor winding temperature by supervisory system, if the winding temperature indication is incorrect, may make the dispatcher make false judgment, affect the safe and stable operation of electrical network.
The utility model content
The purpose of this utility model is to provide a kind of adaptation of winding temperature gage, cause and regulate contact oxidation and cause resistance value to raise and winding temperature gage heating element and outside process of carrying out heat interchange to solve long-term continuous firing self-heating that adaptation of the prior art exists, make to measure incorrect problem.
Realize that the technical solution of the utility model is as follows: a kind of adaptation of winding temperature gage, comprise single-chip microcomputer, secondary current input terminal and input isolator, the secondary current input terminal is connected to single-chip microcomputer by input isolator; Also comprise pulse signal generator, output isolator, output control module and heating current lead-out terminal; The heating current lead-out terminal is connected to single-chip microcomputer by output control module, output isolator and pulse signal generator successively; Also comprise communication module, communication module is connected to single-chip microcomputer; Also comprise power module, power module is single-chip microcomputer, input isolator, pulse signal generator, output isolator, output control module and communication module power supply.
Principle of work of the present utility model is: at first by communication module input initialization parameter, arrive single-chip microcomputer, comprise the poor △ T of the copper oil temperature of transformer to be measured under rated load, the rated capacity S of transformer to be measured, rated voltage U, the rated transformation ratio N of Current Transmit and corresponding model thereof, and the poor curve of copper oil temperature of winding temperature gage, calculate rated secondary current
According to the poor △ T of the copper oil temperature under rated load, find specified heating current I in the poor curve of copper oil temperature
sCalculate afterwards rated secondary current value I
pWith specified heating current value I
sRatio m, m=I
p/ I
s.Due to transformer, under actual load, the secondary current of Current Transmit output also equals m with the ratio of heating current, so under actual load, the secondary current I of the secondary current input terminal real-time sampling Current Transmit by adaptation
p' to single-chip microcomputer, calculate heating current I
s', I
s'=I
p'/m.The pulse signal generator of adaptation and output control module output heating current I
s' to the heating current lead-out terminal; Heater element in winding temperature gage is connected to the heating current lead-out terminal, heating current I
s' the heater element of flowing through generation heat, after-expansion occurs after temperature sensing medium is heated, thereby make flexible member produce additional displacement, drive pointer and rotate to indicate winding temperature.
In order to make measurement result more accurate, the utility model has also increased the parts of heating current feedback regulation and function.Specific as follows: as in technique scheme, to increase oil surface temperature signal terminal, winding temperature signal terminal and two signal isolators; The oil surface temperature signal terminal is connected to single-chip microcomputer by a signal isolator, and the winding temperature signal terminal is connected to single-chip microcomputer by another signal isolator, and carrys out the temperature of measuring transformer winding according to following flow process:
Step 1: input rated capacity S, the rated voltage U summation current transformer rated transformation ratio N of transformer to be measured, calculate the rated secondary current I under transformer rated load to be measured
p,
Step 2: input the poor △ T of the copper oil temperature of transformer to be measured under rated load, the poor curve of copper oil temperature of inquiry winding temperature gage, draw specified heating current I
s
Step 3: calculate rated secondary current I
pWith specified heating current I
sRatio m, m=I
p/ I
s
Step 4: measure the actual secondary current I inputted on the secondary current input terminal
p';
Step 5: calculate heating current I
s', I
s'=I
p'/m;
Step 6: the poor curve of copper oil temperature according to heating current Is' inquiry winding temperature gage draws the poor △ T' of desirable copper oil temperature;
Step 7: by the oil surface temperature signal terminal, gather oil surface temperature T
Oil
Step 8: calculate the desirable winding temperature T of transformer to be measured
Around, T
Around=T
Oil+ △ T';
Step 9: to heating current lead-out terminal output heating current I
s';
Step 10: by the winding temperature signal terminal, gather actual winding temperature T
Around';
Step 11: actual winding temperature T
Around' and desirable winding temperature T
Around, work as T
Around'<T
AroundThe time, increase heating current I
s'; Work as T
Around' T
AroundThe time, reduce heating current I
s';
Step 12: repeat above-mentioned steps nine to step 11, until T
Around'=T
Around.
Technique effect of the present utility model is to adopt single-chip microcomputer to replace the build-out resistor of traditional winding temperature gage, and the indirect thermometric of traditional thermal simulation has been done to closed-loop control.The winding temperature of adaptation Real-time Collection thermal simulation, compare with winding temperature calculating value, automatically adjusts heating current, revises in real time the indicated value of winding temperature gage.After winding temperature gage adopts adaptation of the present utility model, winding temperature is measured and is not subject to environment temperature and the rotten impact of build-out resistor, and operations staff and monitor staff can obtain winding temperature value accurately.The utility model is applied in production reality, can guarantee to enter the correctness of the winding temperature of supervisory system, truly reflects the working condition of transformer, allows dispatcher and operations staff make accurate judgment, significant to power network safety operation.
The accompanying drawing explanation
Fig. 1 is winding temperature gage thermal simulation experiment thermometric schematic diagram in prior art.
Fig. 2 is the system construction drawing of adaptation.
Fig. 3 is the poor curve synoptic diagram of copper oil temperature of winding temperature gage.
Fig. 4 is the circuit theory diagrams of adaptation.
Embodiment
As Fig. 4, a kind of adaptation of winding temperature gage, comprise STC12C5A60S2 single-chip microcomputer, Switching Power Supply, also includes input and output terminal, RS232 programming and debugging interface and output control module; The STC12C5A60S2 single-chip microcomputer is connected with oil surface temperature signal input terminal, winding temperature signal input terminal and CT secondary current input terminal respectively by pin ADC0, ADC1, ADC2, by pin T0, with lead-out terminal, is connected; RS232 programming and debugging interface are used the SP232EEN chip, its RXD is connected with RXD with the TXD of single-chip microcomputer respectively with the TXD port, can receive the initialization informations such as the poor curve of copper oil temperature, specified temperature rise, rated capacity, rated voltage and CT rated transformation ratio, the user can utilize programming software to be programmed and accuracy correction to adaptation by this interface simultaneously.
Input terminal, lead-out terminal have all adopted quarantine measures, the CT secondary current adopts mutual inductor to be isolated, oil surface temperature marking current and winding temperature marking current are used the T1100 chip to be isolated, output pulse signal is isolated by pulse transformer, thereby has guaranteed the security of adaptation in the industry spot application.By convert to+5V of LT1777IS Switching Power Supply voltage for chips such as single-chip microcomputer, RS232, by convert to+2.5V of AD780 voltage stabilizing chip general+5V for digital-to-analog conversion in mutual inductor and monolithic Bigpian.Output control module consists of an alternating-current chopper circuit, single-chip microcomputer is by a pulse signal that dutycycle is adjustable of T0 port controlling pulse signal generator output, isolation through pulse transformer, then control conducting and the shut-in time of MOSFET pipe, thereby control the electric current that the equivalent current adjustment of flowing through shunt resistance R17 is flow through heating element.
Claims (5)
1. the adaptation of a winding temperature gage, is characterized in that, comprises single-chip microcomputer, secondary current input terminal and input isolator, and the secondary current input terminal is connected to single-chip microcomputer by input isolator; Also comprise pulse signal generator, output isolator, output control module and heating current lead-out terminal; The heating current lead-out terminal is connected to single-chip microcomputer by output control module, output isolator and pulse signal generator successively; Also comprise communication module, communication module is connected to single-chip microcomputer; Also comprise power module, power module is single-chip microcomputer, input isolator, pulse signal generator, output isolator, output control module and communication module power supply.
2. the adaptation of winding temperature gage as claimed in claim 1, is characterized in that, also comprises oil surface temperature signal terminal, winding temperature signal terminal and two signal isolators; The oil surface temperature signal terminal is connected to single-chip microcomputer by a signal isolator, and the winding temperature signal terminal is connected to single-chip microcomputer by another signal isolator.
3. the adaptation of winding temperature gage as claimed in claim 1, is characterized in that, described input isolator consists of mutual inductor, and described output isolator consists of pulse transformer, and described output control module consists of alternating-current chopper circuit.
4. the adaptation of winding temperature gage as claimed in claim 2, is characterized in that, the model of described signal isolator is T1100.
5. as the adaptation of described any one winding temperature gage of claim 1 to 4, it is characterized in that, the model of described single-chip microcomputer is STC12C5A60S2, and described communication module adopts the chip that model is SP232EEN, and described power module adopts the chip that model is LT1777IS and AD780.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202621093U CN203323901U (en) | 2013-05-14 | 2013-05-14 | Matcher of winding thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202621093U CN203323901U (en) | 2013-05-14 | 2013-05-14 | Matcher of winding thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203323901U true CN203323901U (en) | 2013-12-04 |
Family
ID=49663241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202621093U Expired - Lifetime CN203323901U (en) | 2013-05-14 | 2013-05-14 | Matcher of winding thermometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203323901U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292920A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Matcher for winding thermometer |
| CN104848955A (en) * | 2014-02-18 | 2015-08-19 | 珠海格力电器股份有限公司 | Winding temperature test system and method |
-
2013
- 2013-05-14 CN CN2013202621093U patent/CN203323901U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292920A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Matcher for winding thermometer |
| CN103292920B (en) * | 2013-05-14 | 2017-02-08 | 国家电网公司 | Matcher for winding thermometer |
| CN104848955A (en) * | 2014-02-18 | 2015-08-19 | 珠海格力电器股份有限公司 | Winding temperature test system and method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |