CN103954379A - Fault positioning device of transformer temperature measuring system - Google Patents
Fault positioning device of transformer temperature measuring system Download PDFInfo
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- CN103954379A CN103954379A CN201410145415.8A CN201410145415A CN103954379A CN 103954379 A CN103954379 A CN 103954379A CN 201410145415 A CN201410145415 A CN 201410145415A CN 103954379 A CN103954379 A CN 103954379A
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Abstract
The invention discloses a fault positioning device of a transformer temperature measuring system. The fault positioning device comprises a single-chip microcomputer, an analog/digital converting module, a temperature transmitter, a signal switching module, a resistor signal interface, a current signal interface, a voltage signal interface, sampling resistors, a thermal resistor, a key module, a display module, a power module and the like, wherein the thermal resistor is connected with the temperature transmitter through the signal switching module; after being connected with one sampling resistor in parallel, the output end of the temperature transmitter is connected with the input end of the analog/digital converting module; the resistor signal interface is connected with the signal switching module; after being connected with the other sampling resistor in parallel, the current signal interface is connected with the input end of the analog/digital converting module; the voltage signal interface is directly connected with the input end of the analog/digital converting module; the input end of the single-chip microcomputer is respectively connected with the output end of the analog/digital converting module and the key module, and the output end of the single-chip microcomputer is respectively connected with the signal switching module and the display module.
Description
Technical field
The present invention relates to a kind of Temperature Measurement System for Transformer fault locator, belong to technical field of power systems.
Background technology
Main transformer oil temperature and winding temperature are one of key parameters ensureing its stable operation, can realize the Real-Time Monitoring of these two temperature by temp measuring system, reach the object of monitoring main transformer running status with this.Temp measuring system is mainly made up of temperature sensor 1-1, oil surface temperature display 1-2, transmitter 1-3, cable, backstage converter 1-5 and the machine 1-4 of Surveillance center etc., as shown in Figure 1.Also there are some previous transformer stations,, by transmitter, directly sensor signal are not connected to measure and control device conversion, then are sent to backstage.Thermal resistance is the most frequently used temperature sensor, and its principle is that resistance value varies with temperature and changes, and common are Pt100, Cu100, Cu50 etc.The effect of transmitter is pressure, the resistance signal sensor output, converts voltage/current signals to, and common signal has two kinds of the voltage signal of 0 ~ 5 V and 4 ~ 20 mA current signals.Electric signal transmission, after measure and control device, through the converter in device, converts Temperature numerical to for protection and measurement and control electric signal, and on deliver to background monitoring, realize temperature monitoring.
Because temp measuring system exists multiple links, if any link breaks down, can cause backstage displays temperature to occur deviation.Even if the error of links is all within allowed band, in worst situation, all error Downward additions, also may cause result to occur relatively large deviation.The method of malfunction elimination is to measure the electric signal of each link with multimeter at present, records and be converted into temperature value.The system of a normal operation, the temperature value of each link conversion gained should be consistent, by searching temperature value sudden change link, just can locate fault.But because the temperature transmitter model that each substation uses is inconsistent, thereby conversion relation is also not quite similar; Now in temperature detecting resistance taking Pt100 as main flow, but other temperature-measurement materials also have utilization, the corresponding temperature/resistance characteristic of different materials is not identical yet, this has further increased difficulty to investigation of fault.According to statistics, data reduction and data consultation occupy more than 60% time in malfunction elimination process, become the main restricting factor of quick and precisely locating fault.
In view of this, the inventor studies this, develops specially a kind of Temperature Measurement System for Transformer fault locator, and this case produces thus.
Summary of the invention
The object of this invention is to provide a kind of Temperature Measurement System for Transformer fault locator, improve temp measuring system malfunction elimination efficiency and accuracy.
To achieve these goals, solution of the present invention is:
A kind of Temperature Measurement System for Transformer fault locator, comprises single-chip microcomputer, analog-to-digital converting module, temperature transmitter, signal handover module, resistance signal interface, current signal interface, voltage signal interface, sampling resistor, thermal resistance, key-press module, display module and power module etc.; Wherein, described thermal resistance is connected with temperature transmitter by signal handover module, after an output terminal sampling resistor in parallel of temperature transmitter, is connected with the input end of analog-to-digital converting module; Resistance signal interface is connected with signal handover module, after current signal interface another sampling resistor in parallel, is connected with the input end of analog-to-digital converting module; Voltage signal interface is directly connected with the input end of analog-to-digital converting module; Single-chip microcomputer input end is connected with analog-to-digital converting module output terminal, key-press module respectively, single-chip microcomputer output terminal is connected with display module with signal handover module respectively, and power module is respectively analog-to-digital converting module, temperature transmitter and display module power supply.
As preferably, above-mentioned single-chip microcomputer adopts 51 series monolithics, and specifically can adopt model is the single-chip microcomputer of STC90C51.
As preferably, above-mentioned power module comprises 12V rechargeable battery, and be connected in parallel on 5V power supply chip, the 24V power supply chip of rechargeable battery output terminal, the output terminal of 5V power supply chip is connected with analog-to-digital converting module, and the output terminal of 24V power supply chip is connected with temperature transmitter, display module.
As preferably, above-mentioned analog-to-digital converting module adopts the A/D conversion chip that model is PCF8591.
As preferably, above-mentioned signal handover module adopts relay switch.
As preferably, above-mentioned sampling resistor adopts the precision resister of 250 ohm.
As preferably, said temperature converter adopts the temperature converter that model is SBWZ.
When above-mentioned Temperature Measurement System for Transformer fault locator work, first carry out channel selecting by key-press module:
In the time selecting resistance via, first carry out " self-inspection ", single-chip microcomputer receives after self-test signal, and control signal handover module is switched to thermal resistance, after " self-inspection " is qualified, enter " measurement " pattern, relay switch is to resistance signal interface, and resistance signal, by interface and relay, is input to temperature transmitter, resistance signal is converted to current signal by temperature transmitter, current signal, through high precision first sampling resistor of 250 ohm, is converted to voltage signal, is input to analog-to-digital converting module; In the time selecting current channel, current signal is inputted by current signal interface, then, by high precision second sampling resistor of 250 ohm, is converted to voltage signal, is input to analog-to-digital converting module; In the time selecting voltage channel, voltage signal is directly input to analog-to-digital converting module by voltage signal interface; Voltage signal after above-mentioned conversion converts digital signal to through analog-to-digital converting module and reads for single-chip microcomputer, and single-chip microcomputer, after data processing, shows by display unit the signals such as each resistance value by information.
Temperature Measurement System for Transformer fault locator of the present invention, by the temperature value of each link electric signal representative that converts, contrasts failure system and modular system by link, can find fast abort situation, improves the accuracy of malfunction elimination; And adopt single-chip microcomputer can complete temperature value conversion moment, significantly improve the efficiency of malfunction elimination.
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Brief description of the drawings
Fig. 1 is Temperature Measurement System for Transformer structural representation of the prior art;
Fig. 2 is the Temperature Measurement System for Transformer fault locator structural representation of the present embodiment;
Fig. 3 is the Temperature Measurement System for Transformer fault locator workflow diagram of the present embodiment.
Embodiment
As shown in Figure 2, a kind of Temperature Measurement System for Transformer fault locator, comprises single-chip microcomputer 1, analog-to-digital converting module 2, temperature transmitter 3, signal handover module 4, resistance signal interface 5, current signal interface 6, voltage signal interface 7, the first sampling resistor 8, the second sampling resistor 9, thermal resistance 10, key-press module 11, display module 12 and power module 13 etc.Wherein, described thermal resistance 10 is connected with temperature transmitter 3 by signal handover module 4 respectively with resistance signal interface 5, after output terminal first sampling resistor 8 in parallel of temperature transmitter 3, is connected with the input end of analog-to-digital converting module 2; After current signal interface 6 the second sampling resistor 9 in parallel, be connected with the input end of analog-to-digital converting module 2; Voltage signal interface 7 is directly connected with the input end of analog-to-digital converting module 2; Single-chip microcomputer 1 input end is connected with analog-to-digital converting module 2 output terminals, key-press module 11 respectively, and single-chip microcomputer 1 output terminal is connected with display module 12 with signal handover module 4 respectively.Above-mentioned Temperature Measurement System for Transformer fault locator, by the temperature value of each link electric signal representative that converts, contrasts failure system and modular system by link, can find fast abort situation, improves the accuracy of malfunction elimination; And adopt single-chip microcomputer can complete temperature value conversion moment, significantly improve the efficiency of malfunction elimination.
In the present embodiment, described power module 13 is input as 12V rechargeable battery, is output as 5V and 24V.Realize the conversion of 12V to 5V by LM2576 chip, for analog-to-digital converting module 2 is powered; Realize the conversion of 12V to 24V by MC34063 chip, for temperature transmitter 3 and display module 13 are powered.Standard thermal resistance 10 adopts Pt100, and its resistance in the time of 0 DEG C is 100 ohm, and in the time of 100 DEG C, its resistance is about 138.5 ohm.Resistance signal interface 5, current signal interface 6, voltage signal interface 7 adopt connector to draw interface.Signal handover module 4 utilizes relay to realize, and controls by single-chip microcomputer 1.In the time of " self-inspection " pattern of selection, be switched to standard thermal resistance 10; In the time of " measurement " pattern of selection, be switched to resistance signal interface 5.Temperature transmitter adopts SBWZ model, and corresponding temperature-measurement material is Pt100, and range is 0 ~ 150 DEG C, is output as 4 ~ 20mA DC current signal.It is 0 ~ 5V that analog/digital module 2 requires the voltage signal value being converted, analog/digital chip selection PCF8591 in analog/digital module 2, integrated, an independent power supply of monolithic, low-power consumption, 8 cmos data acquisition devices, PCF8591 has 4 analog inputs, 1 simulation output and 1 serial i 2C bus interface, and transformation result is with I
2c bus form is transferred to single-chip microcomputer.The first sampling resistor 8 and the second sampling resistor 9 all adopt 250 Ω precision resisters.
51 series monolithics that single-chip microcomputer 1 of the present invention can be selected, it is the single-chip microcomputer of STC90C51 that the present embodiment is specifically selected model, compared with traditional 8051 single-chip microcomputers, has larger storage space.
Key-press module 11 adopts common keyswitch, comprises 6 buttons, is specially:
Enter: selected parameter is confirmed, and carried out corresponding function;
Cancel: retain initial parameter, and turn back to an interface;
↑ ↓: change location variable numerical value, cursor movement respective value;
+/-: according to cursor position reading numerical values, and increase and decrease.
It is the LCDs of LCD12864 that display module 12 adopts model, and the display space of 4 row, every row 16 characters is provided.
When above-mentioned Temperature Measurement System for Transformer fault locator work, the module 11 that pushes button " Enter " key, carries out channel selecting:
In the time selecting resistance via, first carry out " self-inspection ", single-chip microcomputer 1 is received after self-test signal, control signal handover module 4 is switched to thermal resistance 10, after " self-inspection " is qualified, enter " measurement " pattern, relay switch 4 is to resistance signal interface 5, resistance signal is by interface 5 and relay, be input to temperature transmitter 3, resistance signal is converted to current signal by temperature transmitter, current signal, through high precision first sampling resistor 8 of 250 ohm, is converted to voltage signal, is input to analog-to-digital converting module 2;
In the time selecting current channel, current signal is inputted by current signal interface 6, then, by high precision second sampling resistor 9 of 250 ohm, is converted to voltage signal, is input to analog-to-digital converting module 2;
In the time selecting voltage channel, voltage signal is directly input to analog-to-digital converting module 2 by voltage signal interface 7;
Voltage signal after above-mentioned conversion converts digital signal to through analog-to-digital converting module 2 and reads for single-chip microcomputer 1, and single-chip microcomputer, after data processing, shows by display unit the signals such as each resistance value by information.
Above-described embodiment and graphic and non-limiting product form of the present invention and style, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not departing from patent category of the present invention.
Claims (8)
1. a Temperature Measurement System for Transformer fault locator, is characterized in that: comprise single-chip microcomputer, analog-to-digital converting module, temperature transmitter, signal handover module, resistance signal interface, current signal interface, voltage signal interface, sampling resistor, thermal resistance, key-press module, display module and power module; Wherein, described thermal resistance is connected with temperature transmitter by signal handover module, after an output terminal sampling resistor in parallel of temperature transmitter, is connected with the input end of analog-to-digital converting module; Resistance signal interface is connected with signal handover module, after current signal interface another sampling resistor in parallel, is connected with the input end of analog-to-digital converting module; Voltage signal interface is directly connected with the input end of analog-to-digital converting module; Single-chip microcomputer input end is connected with analog-to-digital converting module output terminal, key-press module respectively, single-chip microcomputer output terminal is connected with display module with signal handover module respectively, and power module is respectively analog-to-digital converting module, temperature transmitter and display module power supply.
2. a kind of Temperature Measurement System for Transformer fault locator as claimed in claim 1, is characterized in that: described single-chip microcomputer adopts 51 series monolithics.
3. a kind of Temperature Measurement System for Transformer fault locator as claimed in claim 2, is characterized in that: described single-chip microcomputer adopts the single-chip microcomputer that model is STC90C51.
4. a kind of Temperature Measurement System for Transformer fault locator as claimed in claim 1, it is characterized in that: described power module comprises 12V rechargeable battery, and be connected in parallel on 5V power supply chip, the 24V power supply chip of rechargeable battery output terminal, the output terminal of 5V power supply chip is connected with analog-to-digital converting module, and 24V power supply chip is connected with temperature transmitter, display module.
5. a kind of Temperature Measurement System for Transformer fault locator as claimed in claim 1, is characterized in that: described analog-to-digital converting module adopts the A/D conversion chip that model is PCF8591.
6. a kind of Temperature Measurement System for Transformer fault locator as claimed in claim 1, is characterized in that: described signal handover module adopts relay switch.
7. a kind of Temperature Measurement System for Transformer fault locator as claimed in claim 1, is characterized in that: described sampling resistor adopts the precision resister of 250 ohm.
8. a kind of Temperature Measurement System for Transformer fault locator as claimed in claim 1, is characterized in that: described temperature converter adopts the temperature converter that model is SBWZ.
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| CN201410145415.8A CN103954379A (en) | 2014-04-11 | 2014-04-11 | Fault positioning device of transformer temperature measuring system |
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| CN201410145415.8A CN103954379A (en) | 2014-04-11 | 2014-04-11 | Fault positioning device of transformer temperature measuring system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478350A (en) * | 2017-07-31 | 2017-12-15 | 中车南京浦镇车辆有限公司 | A kind of Rolling Stock Bearing temperature checking method and digital-to-analog integrated form temperature sensor |
| CN109506797A (en) * | 2018-12-28 | 2019-03-22 | 国家电网有限公司 | A kind of transforming plant main transformer oil temperature integrated testing device |
| CN109974897A (en) * | 2019-04-02 | 2019-07-05 | 上海外高桥造船有限公司 | A kind of PT100 temperature alarming tester |
| CN113514168A (en) * | 2021-04-22 | 2021-10-19 | 昆明北方红外技术股份有限公司 | Multi-channel temperature sensor testing device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478350A (en) * | 2017-07-31 | 2017-12-15 | 中车南京浦镇车辆有限公司 | A kind of Rolling Stock Bearing temperature checking method and digital-to-analog integrated form temperature sensor |
| CN109506797A (en) * | 2018-12-28 | 2019-03-22 | 国家电网有限公司 | A kind of transforming plant main transformer oil temperature integrated testing device |
| CN109974897A (en) * | 2019-04-02 | 2019-07-05 | 上海外高桥造船有限公司 | A kind of PT100 temperature alarming tester |
| CN113514168A (en) * | 2021-04-22 | 2021-10-19 | 昆明北方红外技术股份有限公司 | Multi-channel temperature sensor testing device |
| CN113514168B (en) * | 2021-04-22 | 2023-04-14 | 昆明北方红外技术股份有限公司 | Multi-channel temperature sensor testing device |
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