CN206974683U - A kind of oil-filled transformer oil temperature switch calibration equipment - Google Patents
A kind of oil-filled transformer oil temperature switch calibration equipment Download PDFInfo
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- CN206974683U CN206974683U CN201720966709.6U CN201720966709U CN206974683U CN 206974683 U CN206974683 U CN 206974683U CN 201720966709 U CN201720966709 U CN 201720966709U CN 206974683 U CN206974683 U CN 206974683U
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- temperature switch
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- 238000006243 chemical reaction Methods 0.000 claims description 10
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012795 verification Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
The utility model provides a kind of oil-filled transformer oil temperature switch calibration equipment, including microprocessor, temperature sensor input interface, electric bridge change-over circuit, voltage amplifier circuit, A/D change-over circuits, first switch amount input interface, second switch amount input interface, display unit and temperature sensor, oil-filled transformer oil temperature switch to be measured has the first oil temperature switch and the second oil temperature switch, the signal output part of temperature sensor passes through temperature sensor input interface, electric bridge change-over circuit, voltage amplifier circuit, A/D change-over circuits access the signal input part of microprocessor；First oil temperature switch and the second oil temperature switch access the interrupt interface of microprocessor by first switch amount input interface and second switch amount input interface respectively, and the signal output part of microprocessor is connected with display unit.The utility model can carry out field-checking to oil temperature switch, instead of being manually operated, greatly reduce time delay, improve accuracy.
Description
Technical field
T ＆ D Technology field is the utility model is related to, specifically a kind of oil-filled transformer oil temperature switch calibration equipment.
Background technology
In power transmission and transformation line, the conversion of different voltage class is realized by oil-filled transformer.Oil-filled transformer exists
In work, winding can be because cause oil-filled transformer cooling oil temperature to raise by high current to produce amount of heat, cooling
Oil needs fan to be cooled down, to ensure that transformer is working properly.And the effect of oil-filled transformer oil temperature switch is exactly in oil
When immersion transformer Cooling oil temperature exceedes setting value, send signal enabling fan and oil-filled transformer is cooled down.
It is consistent to determine whether and set that the working value of oil temperature switch needs periodic check.Each oil temperature gauge is equipped with two oil
Temperature switch, every transformer are furnished with several oil temperature gauges, and each transformer station is equipped with several oil-filled transformers again, therefore is becoming
In the power station interruption maintenance short time, it is impossible to numerous oil temperature switch is removed and is sent to laboratory verification, but existing
Field verification.Current field-checking mainly uses manual method：By the temperature-sensitive member of the oil temperature gauge where detected oil temperature switch
Part is put into normal temperature equipment, is slowly increased the temperature of normal temperature equipment, when universal meter amount to oil temperature switch closes, is looked into
The temperature of normal temperature equipment is seen, with the working value of this determination oil temperature switch.Obviously, it was observed that oil temperature switch closure goes to check again
Existence time postpones between the temperature of normal temperature equipment, therefore manual method has error.
The content of the invention
In order to solve the above problems, the utility model provides a kind of oil-filled transformer oil temperature switch calibration equipment, can
To carry out field-checking to oil temperature switch, instead of being manually operated, time delay is greatly reduced, improves accuracy.
A kind of oil-filled transformer oil temperature switch calibration equipment, including microprocessor, temperature sensor input interface, electric bridge
Change-over circuit, voltage amplifier circuit, A/D change-over circuits, first switch amount input interface, second switch amount input interface, display
Unit and temperature sensor, oil-filled transformer oil temperature switch to be measured have two oil temperature switches, are the first oil temperature switch respectively
With the second oil temperature switch, the temperature sensor is used for the Current Temperatures for detecting the first oil temperature switch and the second oil temperature switch, temperature
The signal output part for spending sensor is changed by temperature sensor input interface, electric bridge change-over circuit, voltage amplifier circuit, A/D
Circuit accesses the signal input part of microprocessor；First oil temperature switch and the second oil temperature switch are inputted by first switch amount respectively
The interrupt interface of interface and second switch amount input interface access microprocessor, the signal output part and display unit of microprocessor
Connection.
Further, the resistance signal of temperature sensor output passes through electric bridge conversion, the voltage amplification of electric bridge change-over circuit
After the voltage amplification of circuit and the A/D conversions of A/D change-over circuits, by microcomputer reads, as the first oil temperature switch and second
The Current Temperatures of oil temperature switch.Further,
Further, the temperature sensor is the Pt100 temperature sensors of three-wire system.
Further, the A/D change-over circuits use MAX187 chips.
Further, the microprocessor uses ATmega16 chips, has SPI interface and two-way interrupt interface all the way,
Wherein SPI interface is connected with the SPI interface of A/D change-over circuits, to access the temperature value of A/D change-over circuits conversion, two interruptions
Interface is connected with first switch amount input interface and second switch amount input interface respectively, and microprocessor is examined in a manner of " interruption "
Survey the state of oil temperature switch.
The utility model embedded micro-processor uninterruptedly reads the current temperature of oil temperature switch, and the method for using " interruption " is fast
Speed detection oil temperature switch state, when detect oil temperature switch closure when, immediately by oil temperature switch it is current temperature locking and
Shown on display, because microprocessor work is in 8MHz, it is 0.125 microsecond that single instrction, which performs the time, and use " in
It is disconnected " method detection oil temperature switch state, time delay can be greatly reduced, improve the accuracy of detection.
Brief description of the drawings
Fig. 1 is the circuit module block diagram of the utility model oil-filled transformer oil temperature switch calibration equipment；
Fig. 2 is the electrical block diagram of the utility model immersion temperature of oil in transformer switch calibration equipment.
In figure：1-microprocessor, 2-temperature sensor input interface, 3-electric bridge change-over circuit, 4-voltage amplification electricity
Road, 5-A/D change-over circuits, 6-first switch amount input interface, 7-second switch amount input interface, 8-display unit, 9-
Temperature sensor, the 10-the first oil temperature switch, the 11-the second oil temperature switch.
Embodiment
Below in conjunction with the accompanying drawing in the utility model, the technical scheme in the utility model is carried out clearly and completely
Description.
Fig. 1 show the structural representation of the utility model oil-filled transformer oil temperature switch calibration equipment, the oil immersion
Formula temperature of oil in transformer switch calibration equipment includes microprocessor 1, temperature sensor input interface 2, electric bridge change-over circuit 3, voltage
Amplifying circuit 4, A/D change-over circuits 5, first switch amount input interface 6, second switch amount input interface 7, display unit 8 and temperature
Spend sensor 9.
Oil-filled transformer oil temperature switch to be measured has two oil temperature switches, is the first oil temperature switch 10 and the second oil respectively
Temperature switch 11, temperature sensor 9 are used for the Current Temperatures for detecting the first oil temperature switch 10 and the second oil temperature switch 11, TEMP
The signal output part of device 9 changes electricity by temperature sensor input interface 2, electric bridge change-over circuit 3, voltage amplifier circuit 4, A/D
The signal input part of microprocessor 1 is accessed on road 5；First oil temperature switch 10 and the second oil temperature switch 11 pass through first switch amount respectively
Input interface 6 and second switch amount input interface 7 access the interrupt interface of microprocessor 1, the signal output part of microprocessor 1 with
Display unit 8 connects.
As shown in Fig. 2 temperature sensor 9 is the Pt100 temperature sensors of three-wire system in the present embodiment, by verified oil
The temperature-sensing element of oil temperature gauge where immersion temperature of oil in transformer switch is put into experiment oil groove, slow heating experiment oil groove, experiment
The real-time criteria temperature of oil groove is obtained by being installed in the Pt100 temperature sensors inside experiment oil groove, and the sensor is by one three
Line cable connection is to the Pt100 three-wire systems input interface (i.e. temperature sensor input interface 2) of calibration equipment, Pt100 thermal resistances
Using three-wire system, three-wire system can eliminate the additional resistance that connecting cable is brought, and improve the accuracy of temperature detection.Pt100 temperature
The resistance signal for spending sensor turns by electric bridge conversion, the voltage amplification of voltage amplifier circuit 4 and the A/D of electric bridge change-over circuit 3
After changing the A/D conversions of circuit 5, read by microprocessor 1, as current oil sump temperature.Meanwhile the status signal of microprocessor 1
Microprocessor 1 is connected to by first switch amount input interface 6 and second switch amount input interface 7, uninterruptedly read by microprocessor 1
Take.When microprocessor 1 detects the closure signal of the first oil temperature switch 10, current temperature value is locked within 10 milliseconds of times
Determine and shown on display unit 8, the working value as the first oil temperature switch 10；When microprocessor 1 detects the second oil
During the closure signal of temperature switch 11, current temperature value is locked within 10 milliseconds of times and shown on display unit 8,
Working value as the second oil temperature switch 11.
A/D change-over circuits 5 can use MAX187 chips to realize in the present embodiment, and microprocessor 1 is realized using ATmega16,
Display unit 8 uses LCD1602, wherein MAX187 to have 12 precision, can differentiate 0.05 DEG C, while there is MAX187 SPI to connect
Mouthful, inversion temperature value can be transmitted to microprocessor 1 by SPI interface.Microprocessor ATmega16 has SPI interface, passes through
SPI interface reads MAX187 output temperature value.By setting ATmega16 register DDR_SPI, ATmega16 is arranged to
SPI main equipments, MAX187 are arranged to slave unit.It is high level by the way that MAX187 SHDN pins are drawn, MAX187 can be set
The comparison voltage changed using internal reference voltage as A/D.ATmega16 uninterruptedly reads MAX187 transformation result, as
The current temperature value of first oil temperature switch 10 and the second oil temperature switch 11；Meanwhile first oil temperature switch 10 and the second oil temperature switch
11 access the interrupt interface of microprocessor 1 by first switch amount input interface 6 and second switch amount input interface 7 respectively, with
Just the state of the quick detection oil temperature switch in a manner of " interruption " of microprocessor 1, microprocessor are with SPI interface all the way and two
The ATmega16 of road " interruption " interface, microprocessor are handled the temperature signal and switch state signal of input, obtain
After the working value of one oil temperature switch 10 and the second oil temperature switch 11, result is exported to display lcd 1602 and shown.
Because the first oil temperature switch 10 and the second oil temperature switch 11 are connected to ATmega16 " interruption " interface, microprocessor pair
The response highest priority of " interruption ".When the first oil temperature switch 10 closes, ATmega16 suspends other tasks, performs " interruption "
Service routine：Current temperature value is locked and shown on display lcd 1602, as the working value of oil temperature switch 1,
Lock flag is shown simultaneously, shows that the detection of the working value of the first oil temperature switch 10 is completed；When the second oil temperature switch 11 closes,
ATmega16 suspends other tasks, performs " interruption " service routine：By current temperature value locking and on display lcd 1602
Show, as the working value of the second oil temperature switch 11, while show lock flag, show that the working value of oil temperature switch 2 detects
Complete.The crystal oscillator frequency that ATmega16 is used is 8MHz, and the single instrction execution time is 0.125 microsecond.LCD1602 can show two
Row often 16 English of row, numeral or sign character, the first row show oil circuit breaker 1 working value and whether locking signal, the second row
Show oil circuit breaker 2 working value and whether locking signal.After the verification of two oil temperature switches is completed on an oil temperature gauge, press
Lower SR, microprocessor start to initialize, and internal register and the display content of display lcd 1602 are emptied, and are next
Wheel verification is ready.
It is described above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
It is any to belong to those skilled in the art in the technical scope that the utility model discloses in this, the change that can be readily occurred in
Change or replace, should all cover within the scope of protection of the utility model.
Claims (5)
- A kind of 1. oil-filled transformer oil temperature switch calibration equipment, it is characterised in that：Including microprocessor (1), temperature sensor Input interface (2), electric bridge change-over circuit (3), voltage amplifier circuit (4), A/D change-over circuits (5), first switch amount input interface (6), second switch amount input interface (7), display unit (8) and temperature sensor (9), oil-filled transformer oil temperature switch to be measured It is the first oil temperature switch (10) and the second oil temperature switch (11) respectively with two oil temperature switches, the temperature sensor (9) is used In the Current Temperatures for detecting the first oil temperature switch (10) and the second oil temperature switch (11), the signal output part of temperature sensor (9) Accessed by temperature sensor input interface (2), electric bridge change-over circuit (3), voltage amplifier circuit (4), A/D change-over circuits (5) The signal input part of microprocessor (1)；First oil temperature switch (10) and the second oil temperature switch (11) pass through first switch amount respectively The interrupt interface of input interface (6) and second switch amount input interface (7) access microprocessor (1), the signal of microprocessor (1) Output end is connected with display unit (8).
- 2. oil-filled transformer oil temperature switch calibration equipment as claimed in claim 1, it is characterised in that：Temperature sensor (9) The resistance signal of output turns by electric bridge conversion, the voltage amplification of voltage amplifier circuit (4) and the A/D of electric bridge change-over circuit (3) After changing the A/D conversions of circuit (5), read by microprocessor (1), as the first oil temperature switch (10) and the second oil temperature switch (11) Current Temperatures.
- 3. oil-filled transformer oil temperature switch calibration equipment as claimed in claim 1, it is characterised in that：The temperature sensor (9) it is the Pt100 temperature sensors of three-wire system.
- 4. oil-filled transformer oil temperature switch calibration equipment as claimed in claim 1, it is characterised in that：The A/D conversions electricity Road (5) uses MAX187 chips.
- 5. oil-filled transformer oil temperature switch calibration equipment as claimed in claim 1, it is characterised in that：The microprocessor (1) ATmega16 chips are used, there is SPI interface and two-way interrupt interface all the way, wherein SPI interface and A/D change-over circuits (5) SPI interface connection, to access the temperature value of A/D change-over circuits (5) conversion, two interrupt interfaces are defeated with first switch amount respectively Incoming interface (6) and second switch amount input interface (7) connection, microprocessor (1) detect oil temperature switch in a manner of " interruption " State.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720966709.6U CN206974683U (en) | 2017-08-04 | 2017-08-04 | A kind of oil-filled transformer oil temperature switch calibration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720966709.6U CN206974683U (en) | 2017-08-04 | 2017-08-04 | A kind of oil-filled transformer oil temperature switch calibration equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206974683U true CN206974683U (en) | 2018-02-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720966709.6U Active CN206974683U (en) | 2017-08-04 | 2017-08-04 | A kind of oil-filled transformer oil temperature switch calibration equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206974683U (en) |
-
2017
- 2017-08-04 CN CN201720966709.6U patent/CN206974683U/en active Active
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