CN106877502B - Microcomputer protection system for realizing temp. advance prediction and alarm and its control method - Google Patents
Microcomputer protection system for realizing temp. advance prediction and alarm and its control method Download PDFInfo
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- CN106877502B CN106877502B CN201710129997.4A CN201710129997A CN106877502B CN 106877502 B CN106877502 B CN 106877502B CN 201710129997 A CN201710129997 A CN 201710129997A CN 106877502 B CN106877502 B CN 106877502B
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- 230000003993 interaction Effects 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 6
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Classifications
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- H02J13/0075—
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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
- G01K1/02—Means for indicating or recording specially adapted for thermometers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The invention discloses a microcomputer protection system for realizing temperature early prediction and alarm and a control method thereof, wherein the microcomputer protection system comprises a microprocessor, a power supply processing module, an analog quantity acquisition module, a digital quantity input/output module, a man-machine interaction module, a communication interface module, a wireless signal receiving and transmitting module and a relay, wherein a temperature-current fitting curve is arranged in the microprocessor, the power supply processing module is electrically connected with the microprocessor, the relay is electrically connected with the digital quantity input/output module, and the wireless signal receiving and transmitting module is electrically connected with a plurality of wireless temperature sensors. The invention not only can realize the relay protection function, but also can replace a wireless temperature sensor receiving device, realize temperature up-sending and temperature abnormality alarming, and realize early warning of temperature abnormality.
Description
[ field of technology ]
The invention relates to a microcomputer protection device, in particular to a microcomputer protection system for realizing temperature early prediction and alarm and a control method thereof.
[ background Art ]
The microcomputer protection device mainly has the function of protecting the electric elements, and the wireless temperature receiving device and the temperature sensor mainly detect the heating condition of the electric elements and send the temperature information to the monitoring system. Meanwhile, the wireless temperature receiving device can also alarm temperature abnormality. As shown in fig. 1, most of the prior art electrical devices are configured with a wireless temperature sensor and a wireless temperature receiving device separately, and microcomputer protection is also a protection unit that must be configured. The microcomputer protection device and the wireless temperature receiving device operate independently, and the monitoring system and the microcomputer protection device perform data communication and simultaneously perform data communication with the wireless temperature receiving device.
In the prior art, the wireless temperature measurement receiving device and the microcomputer protection device are communicated with the monitoring system, so that the data communication pressure of the monitoring system is increased; the independent configuration of the wireless receiving device increases the cost of the user; the data transmission interval between the wireless receiving device and the wireless temperature sensor is longer, generally 2-10 minutes, and when the temperature is refreshed untimely, the alarm cannot be given out timely as the temperature of the equipment rises.
Therefore, it is necessary to provide a new microcomputer protection system for realizing temperature early prediction and alarm and a control method thereof to solve the above problems.
[ invention ]
One of the main purposes of the invention is to provide a microcomputer protection system for realizing temperature early prediction and alarm, which not only can realize relay protection function, but also can replace a wireless temperature sensor receiving device, realize temperature up-sending and temperature abnormality alarm, and realize early warning of temperature abnormality.
The invention realizes the aim through the following technical scheme: the microcomputer protection system comprises a microprocessor, a power supply processing module, an analog quantity acquisition module, a digital quantity input/output module, a man-machine interaction module, a communication interface module, a wireless signal receiving and transmitting module and a relay, wherein a temperature-current fitting curve is arranged in the microprocessor, the power supply processing module is electrically connected with the microprocessor, the relay is electrically connected with the digital quantity input/output module, and a plurality of wireless temperature sensors are connected to the wireless signal receiving and transmitting module through wireless signals.
Further, the analog quantity acquisition module comprises a current converter, a voltage converter and an analog-to-digital converter.
Furthermore, the analog quantity acquisition module mainly acquires three-phase current and three-phase voltage signals.
Further, the man-machine interaction module comprises a key input module and a liquid crystal display module.
Furthermore, the communication interface module is electrically connected with a monitoring system.
Another main object of the present invention is to provide a control method of a microcomputer protection system for implementing temperature early prediction and alarm, which includes the steps of,
step one: collecting external current and external voltage, and calculating the external current and the external voltage into calculated current and calculated voltage through calculation and conversion;
step two: reading a temperature signal of the wireless temperature sensor and a corresponding current and storing the temperature signal and the corresponding current in a corresponding buffer area;
step three: performing curve fitting control on the temperature-current to obtain a temperature-current fitting curve;
step four: the temperature alarm and the pre-alarm specifically comprise the following steps,
1) Reading a temperature alarm set value Thset and the temperature T transmitted by the wireless temperature sensor last time N Said temperature T N Corresponding current value I N ；
2) Judgment T N >Whether Thset is true;
3) If so, alarming the temperature abnormality; if not, reading the current I, and calculating the predicted temperature Tx according to the temperature current fitting curve N ；
4) Judging the predicted temperature T N >Whether Thset is true;
5) If so, alarming the temperature abnormality; if not, repeating the steps 1) to 5) to continue the temperature abnormality warning judgment.
Further, the specific step of obtaining the temperature-current fitting curve in the step three is that,
1) Reading the last two temperature values T in the buffer zone N 、T N-1 Corresponding current value I N 、I N-1 ；
2) Calculating the temperature change rate Δt=t N -T N-1 ；
3) Calculating the square change rate Δi=i of the current 2 N -I 2 N-1 ；
4) And calculating the ratio of the temperature change rate to the current square change rate to obtain a corresponding temperature/current change rate K= delta T/[ delta ] I.
Further, in the fourth step, the predicted temperature T is N ＝T N +K×(I 2 -I 2 N )。
Compared with the prior art, the microcomputer protection system for realizing temperature early prediction and alarm and the control method thereof have the beneficial effects that:
1) The microcomputer protection device is adopted to receive the wireless temperature sensor signals, a special wireless temperature sensor receiving device is omitted, the microcomputer protection can realize the relay protection function, the wireless temperature sensor receiving device can be replaced, and the temperature up-sending and temperature abnormality alarming can be realized; the microcomputer protection device sends the temperature information to the monitoring system through the communication network, so that the increase of cost caused by independently configuring the temperature receiving device is avoided, the data communication pressure on the monitoring system is reduced, and the working efficiency is improved;
2) By adopting the temperature-current fitting method, when the temperature information sent by the wireless temperature sensor cannot be obtained in the temperature transmission period interval, the temperature is predicted and alarmed in advance, the instantaneity and the sensitivity of temperature detection are improved, and the damage condition of temperature abnormality to equipment is reduced.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a modular control principle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a main program logic diagram according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a current-to-voltage conversion logic block diagram according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a wireless temperature sensor reading logic block diagram according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a temperature-current fitting logic diagram in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a temperature alarm and pre-alarm logic block diagram according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a prior art modular control principle.
[ detailed description ] of the invention
Examples:
referring to fig. 1, the microcomputer protection system for implementing temperature early prediction and alarm and a control method thereof according to the present embodiment include a microprocessor having a temperature-current fitting curve disposed therein, a power processing module electrically connected to the microprocessor, an analog acquisition module, a digital input/output module, a man-machine interaction module, a communication interface module, a wireless signal transceiver module, and a relay electrically connected to the digital input/output module, wherein the wireless signal transceiver module is connected to a plurality of wireless temperature sensors through wireless signals.
The power supply processing module is mainly responsible for supplying power to the protection device. The power supply processing module converts an external power supply, generally AC220V or DC220V, into a device VCC power supply through a switching power supply to provide electric energy for device operation.
The analog quantity acquisition module is mainly responsible for acquiring and transforming external current signals and voltage signals, and mainly comprises a current converter and a voltage converter, wherein the current converter and the voltage converter are used for converting the current signals and the voltage signals into weak current signals which can be received by the microprocessor and isolating strong electric signals. The analog quantity acquisition module also comprises an analog-to-digital converter ADC which converts the analog signals into digital signals and stores the digital signals into the microprocessor. The microprocessor calculates the analog quantity through a corresponding algorithm. The analog quantity acquisition module mainly acquires three-phase current and three-phase voltage signals.
The digital input/output module is mainly responsible for collecting switching value and controlling the output quantity of the relay. The switching value mainly collects a breaker position signal, a breaker trolley (or isolation knife) signal, a grounding switch signal and the like, and the output quantity of the relay is controlled to be mainly used for outputting digital values such as a breaker opening and closing signal, a protection action signal, a wireless temperature alarm signal and the like through the relay signal.
The man-machine interaction module mainly comprises a key input module and a liquid crystal display module, and a user can set parameters and inquire data through the key and the liquid crystal screen. The liquid crystal screen cyclically displays current, voltage, temperature information transmitted by the wireless sensor and the like.
The communication interface module is mainly responsible for carrying out data network communication with the monitoring system. The communication interface module is electrically connected with a monitoring system. The module performs data communication with the monitoring system through a physical link (such as an RS485 communication network, an Ethernet or other communication networks) and under a certain communication protocol (MODBUS or IEC103, IEC104 and the like).
The wireless signal receiving and transmitting module is mainly responsible for carrying out wireless data communication with the wireless temperature sensor, converts the received wireless signals transmitted by the wireless temperature sensor into data signals, and can also convert the data signals of the microprocessor into wireless signals to be transmitted to the wireless temperature sensor.
Referring to fig. 2, fig. 2 is a main program logic block diagram structure of the present embodiment, and the control method of the microcomputer protection system for implementing temperature early prediction and alarm in the present embodiment includes the following steps:
step one: the external currents IA, IB, IC and the external voltages UA, UB, UC are collected and calculated into the calculated currents IA, IB, IC and the calculated voltages UA, UB, UC through calculation and conversion.
Referring to fig. 3, a logic block diagram of current-voltage conversion in this embodiment is shown, and the current and voltage are collected by the analog quantity collection module through ADC conversion and then calculated by a corresponding algorithm.
Step two: reading the temperature signal TA of the wireless temperature sensor N 、TB N 、TC N Corresponding to the current intensity IA N 、IB N 、IC N And stored to the corresponding buffer ITA, ITB, ITC.
Referring to fig. 4, which is a block diagram illustrating a read logic of the wireless temperature sensor according to the present embodiment, a wireless signal of the wireless temperature sensor is obtained by the wireless signal transceiver module, and fig. 4 shows that the control logic reads the temperature signal of the wireless temperature sensor and simultaneously reads the corresponding current at the moment and stores the current in the corresponding buffer.
Step three: and performing curve fitting control on the temperature-current to obtain the temperature-current fitting curve, wherein the curve fitting method specifically comprises the following steps.
1) Reading the latest twice temperature value TA in the buffer zone ITA N 、TA N-1 The latest two temperature values TB in ITB N 、TB N-1 The last two temperature values TC in ITC N 、TC N-1 ；
2) Reading the last two temperature values TA N 、TA N-1 Corresponding current value IA N 、IA N-1 ，TB N 、TB N-1 Corresponding current value IB N 、IB N-1 ，TC N 、TC N-1 Corresponding current value IC N 、IC N-1 ；
3) Calculating the temperature change rate Δta=ta N -TA N-1 ，△TB＝TB N -TB N-1 ，△TC＝TC N -TC N-1 ；
4) Calculating the square change rate Δia=i of the current 2 A N -I 2 A N-1 ，△IB＝I 2 B N -I 2 B N-1 ，△IC＝I 2 C N -I 2 C N-1 ；
5) Calculating the ratio of the temperature change rate to the current square change rate to obtain corresponding temperature/current change rates KA= [ delta ] TA/[ delta ] IA, KB= [ delta ] TB/[ delta ] IB, KC= [ delta ] TC/[ delta ] IC.
Referring to fig. 5, which is a logic block diagram of temperature-current fitting in this embodiment, because the temperature information measured by the wireless temperature sensor has a great relationship with the magnitude of the current, the larger the current is, the more serious the heat is generated, so the higher the temperature sent by the wireless signal is, and the temperature T is related to the square of the current I. In this embodiment, the prediction is performed by piecewise fitting a straight line, and the change Δt=t of the last two-point temperature is calculated N -T N-1 (last temperature information T) N Last adjacent last temperature T N-1 ) Square change Δi=i from current value when temperature is recorded 2 N -I 2 N-1 The corresponding slope K= delta T/[ delta ] I is calculated, and the corresponding temperature/current change rate is respectively obtained for the three phases.
Step four: the temperature alarm and the pre-alarm specifically comprise the following steps,
1) Reading a temperature alarm set value Thset set by a man-machine and the A-phase temperature TA transmitted by the wireless temperature sensor last time N ；
2) Judgment of TA N >Whether Thset is true;
3) If so, alarming the A-phase temperature abnormality; if not, reading the current A-phase current IA, and calculating A-phase predicted temperature T.A according to the temperature-current fitting curve N ＝TA N +KA×(I 2 A-I 2 A N )；
4) Judging the predicted temperature T.times.A of the A phase N >Whether Thset is true;
5) If so, alarming the A-phase temperature abnormality; if not, judging whether the temperatures of the B phase and the C phase are abnormal according to the steps 1) to 5) respectively.
Fig. 6 is a logic block diagram of temperature alarm and pre-alarm in this embodiment, which illustrates how temperature alarm and pre-alarm are performed. First the temperature T of the corresponding phase read from the wireless temperature sensor N Comparing with the set temperature, if the set temperature is exceeded, giving a corresponding phase temperature alarm, if the set temperature is not exceeded, predicting temperature information which is not transmitted by the wireless temperature sensor at present (the transmission data interval of the wireless temperature sensor is generally 2-10 minutes) through the current I measured at this time, and predicting the temperature T N And if the temperature is greater than the temperature set value, carrying out corresponding phase temperature alarm.
The microcomputer protection system for realizing temperature early prediction and alarm and the control method thereof have the beneficial effects that:
1) The microcomputer protection device is adopted to receive the wireless temperature sensor signals, a special wireless temperature sensor receiving device is omitted, the microcomputer protection can realize the relay protection function, the wireless temperature sensor receiving device can be replaced, and the temperature up-sending and temperature abnormality alarming can be realized; the microcomputer protection device sends the temperature information to the monitoring system through the communication network, so that the increase of cost caused by independently configuring the temperature receiving device is avoided, the data communication pressure on the monitoring system is reduced, and the working efficiency is improved;
2) By adopting the temperature-current fitting method, when the temperature information sent by the wireless temperature sensor cannot be obtained in the temperature transmission period interval, the temperature is predicted and alarmed in advance, the instantaneity and the sensitivity of temperature detection are improved, and the damage condition of temperature abnormality to equipment is reduced.
What has been described above is merely some embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (6)
1. A control method of microcomputer protection system for realizing temperature early prediction and alarm is characterized in that: which comprises the steps of the following steps of,
step one: collecting external current and external voltage, and calculating the external current and the external voltage into calculated current and calculated voltage through calculation and conversion;
step two: reading a temperature signal of the wireless temperature sensor and a corresponding current and storing the temperature signal and the corresponding current in a corresponding buffer area;
step three: performing curve fitting control on the temperature-current to obtain a temperature-current fitting curve:
31 Reading the last two temperature values T in the buffer area N 、T N-1 Corresponding current value I N 、I N-1 ；
32 Calculating a temperature change rate Δt=t N -T N-1 ；
33 Calculating the square change rate Δi=i) 2 N -I 2 N-1 ；
34 Calculating the ratio of the temperature change rate to the current square change rate to obtain a corresponding temperature/current change rate K= delta T/[ delta ] I;
step four: the temperature alarm and the pre-alarm specifically comprise the following steps,
41 Reading the temperature alarm set value Thset and the temperature T transmitted by the wireless temperature sensor last time N Said temperature T N Corresponding current value I N ；
42 Judgment of T) N >Whether Thset is true;
43 If true, alarming the temperature abnormality; if not, reading the current I, and calculating the predicted temperature Tx according to the temperature current fitting curve N ＝T N +K×(I 2 -I 2 N )；
44 Judging the predicted temperature T N >Whether Thset is true;
45 If true, alarming the temperature abnormality; if not, repeating the steps 41) to 45) to continue the temperature abnormality warning judgment.
2. A microcomputer protection system for implementing the control method of claim 1, characterized by: the temperature-current fitting curve processing device comprises a microprocessor, a power supply processing module, an analog quantity acquisition module, a digital quantity input/output module, a man-machine interaction module, a communication interface module, a wireless signal receiving and transmitting module and a relay, wherein the microprocessor is internally provided with the temperature-current fitting curve, the power supply processing module is electrically connected with the microprocessor, the wireless signal receiving and transmitting module is electrically connected with the digital quantity input/output module, and the wireless signal receiving and transmitting module is electrically connected with a plurality of wireless temperature sensors.
3. A microcomputer protection system as defined in claim 2, wherein: the analog quantity acquisition module comprises a current converter, a voltage converter and an analog-to-digital converter.
4. A microcomputer protection system as defined in claim 2, wherein: the analog quantity acquisition module mainly acquires three-phase current and three-phase voltage signals.
5. A microcomputer protection system as defined in claim 2, wherein: the man-machine interaction module comprises a key input module and a liquid crystal display module.
6. A microcomputer protection system as defined in claim 2, wherein: the communication interface module is electrically connected with a monitoring system.
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| CN206698012U (en) * | 2017-03-07 | 2017-12-01 | 江苏国网自控科技股份有限公司 | It is a kind of to realize temperature look-ahead and the microcomputer protection system of alarm |
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Patent Citations (4)
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| CN1647361A (en) * | 2002-03-20 | 2005-07-27 | 丰田自动车株式会社 | Motor temperature estimator and motor controller |
| CN103292931A (en) * | 2013-05-31 | 2013-09-11 | 国家电网公司 | Benchmark data measuring device for power cable fiber temperature measurement |
| CN104075825A (en) * | 2014-06-30 | 2014-10-01 | 国家电网公司 | Power cable optical fiber temperature measurement benchmark data measuring method |
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