CN111220288A - Intelligent temperature detection system of high-voltage switch cabinet - Google Patents
Intelligent temperature detection system of high-voltage switch cabinet Download PDFInfo
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- CN111220288A CN111220288A CN202010122891.3A CN202010122891A CN111220288A CN 111220288 A CN111220288 A CN 111220288A CN 202010122891 A CN202010122891 A CN 202010122891A CN 111220288 A CN111220288 A CN 111220288A
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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
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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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
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- 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
- G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
-
- 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
- G01K1/028—Means for indicating or recording specially adapted for thermometers arrangements for numerical indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
- G01K11/26—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies
- G01K11/265—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies using surface acoustic wave [SAW]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses an intelligent temperature detection system of a high-voltage switch cabinet, which comprises a temperature sensor, a data reader-writer and a system server, wherein the temperature sensor is used for detecting the temperature of a high-voltage switch cabinet; the temperature sensor is used for acquiring temperature data of the equipment; the data reader-writer is used for reading and processing sensor data; the system server is used for background analysis and monitoring of data. The system can improve the safety guarantee of the equipment, timely, continuously and accurately reflect the running state of the equipment, avoid the occurrence of safety accidents and reduce the accident rate of the equipment. The device is particularly suitable for closed equipment which cannot perform artificial infrared temperature measurement, such as a 10kV middle-mounted switch cabinet, a cable distribution box, a small-sized ring main unit and the like. The invention can reflect the running temperature of the equipment in real time, and can pre-warn the thermal defect of the equipment and pre-control the serious consequence of the equipment through background intelligent data analysis. The terminal data can also be transmitted to the power internet of things and implemented together with the distribution network automation project.
Description
Technical Field
The invention belongs to the technical field of high-voltage switch cabinet temperature detection, and particularly relates to an intelligent high-voltage switch cabinet temperature detection system based on a passive ultrahigh frequency RFID technology.
Background
The temperature measurement of a switch cabinet and a cable is a conventional project for power transformation operation and maintenance, but due to the closed structural design of the switch cabinet, the existing temperature measurement technology cannot completely meet the requirement of the internal temperature measurement of equipment. At present, the temperature rise state of the power equipment is mainly detected by mainstream technologies such as infrared temperature measurement and optical fiber temperature measurement. The infrared temperature measurement technology has weak infrared penetration capability, and has larger influence on radiance caused by environmental factors such as different materials, air temperature and the like, so that the temperature of closed environments such as the inside of high-voltage electrical equipment (such as the internal structure of a 10kV centrally installed switchgear) and the like cannot be accurately displayed in a thermal image form, and the infrared temperature measurement technology has larger limitation; the optical fiber temperature measurement system has the advantages of complex structure, higher technical requirement, more equipment connecting circuits, higher wiring difficulty in the cabinet and high cost. Meanwhile, the optical fiber is easy to break, is not high-temperature resistant, is easy to reduce the insulativity after accumulating dust, and is not easy to widely popularize and use in the voltage class of 110kV or below.
At present, because of the influence of meteorological high temperature and load climbing, a power cable and a heavy load switch cabinet in a substation work in severe environments such as high voltage, heavy current and the like for a long time, and the internal temperature is increased due to heat accumulation. Because the real-time monitoring of the temperature can not be realized, the equipment is likely to cause the insulation damage of the equipment after long-term 'faulty' operation, and can cause short-circuit tripping, fire and even large-area power failure in serious cases, thereby causing huge economic loss and social influence. Statistically, 40% of power cable and 70% of high voltage switchgear failures are caused by over-temperature of the equipment.
The switch cabinet is widely used in distribution networks of all levels of power grid companies and is an important device in power grids. In the handcart type switch cabinet, the contact resistance of the moving contact and the static contact works in a long-term high-voltage and high-current environment, and the resistance is gradually increased due to aging and the like, so that the contact part is heated. In the long-term past, the heat generation further aggravates the aging of the moving contact and the static contact, so that a vicious circle is formed, and finally, power accidents such as switch burning, explosion and the like are caused. Therefore, monitoring and controlling the temperature of the switch cabinet becomes one of the subjects of safe operation in the power industry.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides an intelligent temperature detection system for a high-voltage switch cabinet, which monitors the temperature of electrical connection points such as bus bar lap joint points, circuit breaker contacts, cable joints and the like in the high-voltage switch cabinet and prevents hidden danger caused by overlarge contact resistance of the contact points due to factors such as oxidation, looseness, dust and the like in the operation process.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
an intelligent temperature detection system of a high-voltage switch cabinet comprises a temperature sensor, a data reader-writer and a system server; the temperature sensor is used for acquiring temperature data of the equipment; the data reader-writer is used for reading and processing sensor data; the system server is used for background analysis and monitoring of data.
In order to optimize the technical scheme, the specific measures adopted further comprise:
the temperature sensor is arranged on the cable to be measured.
The temperature sensor is a passive ultrahigh frequency RFID temperature sensing tag, and transmits acquired data to the data reader-writer through an RFID technology.
The temperature sensor is a tuning fork label and/or a snap-in label.
The data reader transmits data to the system server through the narrow-band Internet of things.
The data interface of the data reader-writer and the system server is RS232 or RS485, and the interface communication protocol is ModBus RTU.
The system server transmits the temperature of the equipment to the wireless terminal equipment in real time for operation and maintenance maintainers to check;
or through expert analysis software of the monitoring center, the abnormal condition of the equipment is judged, and early warning is carried out in advance when the equipment is abnormal.
An intelligent temperature detection method for a high-voltage switch cabinet is characterized by comprising the following steps:
(1) installing a temperature sensor;
(2) the temperature sensor collects the temperature of the equipment and transmits data to the data reader-writer through the RFID technology;
(3) the data reader-writer processes the sensor data and transmits the data to the system server through the narrow-band Internet of things;
(4) and the system server performs background analysis and monitoring on the data.
In the step (1), the method for installing the temperature sensor includes:
according to the installation environment of cables in the high-voltage switch cabinet, the temperature sensor is designed into a ferrule or patch mode;
the temperature sensor is installed on the surface of the metal to be measured in a contact mode and is fixed by using glue or screws; or the temperature sensor is arranged in a closed plastic space.
The invention has the following beneficial effects:
1. the system can improve the safety guarantee of the equipment, timely, continuously and accurately reflect the running state of the equipment, avoid the occurrence of safety accidents and reduce the accident rate of the equipment.
2. The invention is particularly suitable for closed equipment which can not carry out artificial infrared temperature measurement, such as a 10kV middle-mounted switch cabinet, a cable distribution box, a small-sized ring main unit and the like. The joint part of the equipment generates heat due to oxidation and installation process problems in the operation process, and equipment explosion is easily caused in the operation process. The invention can reflect the running temperature of the equipment in real time, and can pre-warn the thermal defect of the equipment and pre-control the serious consequence of the equipment through background intelligent data analysis. The terminal data can also be transmitted to the power internet of things and implemented together with the distribution network automation project.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of the installation of a temperature sensor;
FIG. 3 is a schematic diagram of data transmission;
fig. 4 is a monitoring center monitoring overview.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, an intelligent temperature detection system for a high-voltage switch cabinet comprises a temperature sensor, a data reader-writer and a system server; the temperature sensor is used for acquiring temperature data of the equipment; the data reader-writer is used for reading and processing sensor data; the system server is used for background analysis and monitoring of data.
Referring to fig. 2, in the embodiment, the temperature sensor is mounted on a cable to be measured.
Referring to fig. 3, in the embodiment, the temperature sensor is a passive ultrahigh frequency RFID temperature sensing tag (tuning fork tag and/or snap-in tag), the temperature sensor transmits acquired data to the data reader through an RFID technology (antenna), technical parameters of the antenna refer to table 1, and technical parameters of the passive ultrahigh frequency RFID temperature sensing tag refer to table 2.
TABLE 1
| Parameter(s) | Value of |
| Size of | 127*127*14mm |
| Temperature range | -40℃～75℃ |
| Center frequency point | 915MHz±3MHz |
| Standing wave ratio | <1.3:1 |
| Wide band | >20MHz |
| Interface impedance | 50 ohm |
| Typical gain | 5.3dBi |
| Direction of polarization | Right hand circular polarization |
| Protection class | IP55 |
| Fixing mode | Magnetic suction type |
TABLE 2
The passive ultrahigh frequency RFID temperature sensing tag is a high-precision temperature sensing tag. The tag is developed based on a passive ultrahigh frequency RFID technology, and has the characteristics of no battery, no need of high magnetic flux self-power taking and wireless temperature measurement. Meanwhile, the antenna can work well in most application scenes including metal surfaces based on special antenna design and base material composition, and has the temperature resistance characteristic of resisting the environment temperature of more than 250 ℃. On the premise of not influencing the insulativity and safety of the power equipment at all, the requirement of monitoring the real-time temperature of key nodes of the power equipment is met, and the measurement precision is +/-1 ℃.
In an embodiment, the data reader transmits data to a system server through a narrowband internet of things.
The data interface of the data reader-writer and the system server is RS232 or RS485, and the interface communication protocol is ModBus RTU.
The data reader adopts a high-performance and anti-interference overall design, and realizes temperature monitoring, data acquisition and forwarding of the temperature sensor. Data interfaces RS232 and RS485, the interface communication protocol is ModBus RTU, the number of the supported maximum temperature sensors is 96, and the technical parameters of the data reader-writer are shown in table 3.
TABLE 3
The system server transmits the equipment temperature to wireless terminal equipment (DTU) in real time for operation and maintenance maintainers to check;
or through expert analysis software of the monitoring center, the abnormal condition of the equipment is judged, and early warning is carried out in advance when the equipment is abnormal.
See fig. 4 for monitoring content of the monitoring center.
The existing several electric power temperature measurement schemes are compared as follows:
the principle of surface acoustic waves: after receiving an electromagnetic signal sent by a reader by an antenna, the sensor chip is converted into a mechanical wave (namely a surface acoustic wave) which propagates along the surface of the substrate by the interdigital transducer, and then the mechanical wave is converted into an electric signal again by the transducer and returns to the reader. The time delay or the resonant frequency of the return signal is affected by physical quantities such as temperature, and sensing is achieved.
CT type electricity-taking wireless temperature measurement principle: the electromagnetic energy of the power transmission line is converted into electric energy through electric field coupling to provide working energy for the sensor and the low-power-consumption wireless communication chip.
The invention discloses an intelligent temperature detection system of a high-voltage switch cabinet based on a passive ultrahigh frequency RFID technology, which comprises the following steps:
1) collecting the RF electromagnetic wave Energy of 840MHz-960MHz as a chip power supply by using an ultra-high frequency radio wave Energy collecting (Energy Harvesting) technology;
2) 512-bit erasable nonvolatile data storage units are arranged in the chip and used for storing data such as user information;
3) the radio frequency chip communication interface supports an EPC Global C1G2 v1.2 communication interface, and the communication mode is a full digital mode, and commands are interacted with ID and CRC;
4) a 12-digit digital-to-analog conversion circuit is arranged in the temperature control circuit, and the temperature control circuit is free from interference;
5) the core advantages are as follows:
■ the acoustic surface temperature measurement is analog quantity, the value is easy to be interfered by the environment, such as electromagnetic wave, mechanical vibration, and the physical parameter of the crystal shifts after the operation in a severe environment in a certain time field;
■ simple analog communication is adopted between the acoustic meter temperature sensor and the reader, the anti-interference performance is poor, the same frequency signal source, mechanical vibration and the like can generate interference, and the received error signal can not be distinguished;
■, the acoustic watch has the problems of lack of digital ID, regular maintenance, poor anti-interference performance, difficult installation and debugging and the like;
the ■ CT type electricity-getting temperature measurement product needs to be integrated by a plurality of chips and devices, and has an electricity-getting ring, thus having clumsy volume and poor reliability;
the ■ CT type electricity taking and temperature measuring is limited by the current of a primary line, cannot be started when the current is too small, and can be damaged by overload when the current is too large;
the ■ CT type electricity-taking temperature measurement installation and debugging has the contradiction that the power failure does not work and is difficult to debug, and the debugging is generally not allowed if the power is on, the RFID temperature measurement sensor and the installation part are equivalent electrical potential bodies, the power failure state is ensured to be installed and debugged, and the power on state is not changed.
The performance indexes of the three temperature measurement schemes are compared and shown in the table 4.
TABLE 4
An intelligent temperature detection method for a high-voltage switch cabinet comprises the following steps:
(1) installing a temperature sensor;
the method for installing the temperature sensor comprises the following steps: according to the cable installation environment in the high-voltage switch cabinet, the customized temperature sensor can be designed into a ferrule, a patch and the like. The temperature sensor is installed on the surface of the metal to be measured in a contact mode and can be fixed by glue, screws and the like, and the temperature sensor can also be installed in a closed plastic space.
(2) The temperature sensor collects the temperature of the equipment and transmits data to the data reader-writer through the RFID technology;
(3) the data reader-writer processes the sensor data and transmits the data to the system server through the narrow-band Internet of things;
(4) and the system server performs background analysis and monitoring on the data.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (9)
1. An intelligent temperature detection system of a high-voltage switch cabinet is characterized by comprising a temperature sensor, a data reader-writer and a system server; the temperature sensor is used for acquiring temperature data of the equipment; the data reader-writer is used for reading and processing sensor data; the system server is used for background analysis and monitoring of data.
2. The intelligent temperature detection system for the high-voltage switch cabinet as claimed in claim 1, wherein the temperature sensor is mounted on a cable to be detected.
3. The intelligent temperature detection system for the high-voltage switch cabinet as claimed in claim 1, wherein the temperature sensor is a passive ultrahigh frequency RFID temperature sensing tag, and the temperature sensor transmits the collected data to the data reader/writer through an RFID technology.
4. The intelligent temperature detection system for the high-voltage switch cabinet according to claim 1, wherein the temperature sensor is a tuning fork tag and/or a snap-in tag.
5. The intelligent temperature detection system for the high-voltage switch cabinet according to claim 1, wherein the data reader transmits data to a system server through a narrowband internet of things.
6. The intelligent temperature detection system for the high-voltage switch cabinet as claimed in claim 1, wherein the data interface for the communication between the data reader and the system server is RS232 or RS485, and the interface communication protocol is ModBus RTU.
7. The intelligent temperature detection system for the high-voltage switch cabinet according to claim 1, wherein the system server transmits the temperature of the equipment to the wireless terminal equipment in real time for the operation and maintenance staff to check;
or through expert analysis software of the monitoring center, the abnormal condition of the equipment is judged, and early warning is carried out in advance when the equipment is abnormal.
8. An intelligent temperature detection method for a high-voltage switch cabinet is characterized by comprising the following steps:
(1) installing a temperature sensor;
(2) the temperature sensor collects the temperature of the equipment and transmits data to the data reader-writer through the RFID technology;
(3) the data reader-writer processes the sensor data and transmits the data to the system server through the narrow-band Internet of things;
(4) and the system server performs background analysis and monitoring on the data.
9. The intelligent temperature detection system for the high-voltage switch cabinet according to claim 8, wherein the method for installing the temperature sensor in the step (1) comprises the following steps:
according to the installation environment of cables in the high-voltage switch cabinet, the temperature sensor is designed into a ferrule or patch mode;
the temperature sensor is installed on the surface of the metal to be measured in a contact mode and is fixed by using glue or screws; or the temperature sensor is arranged in a closed plastic space.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010122891.3A CN111220288A (en) | 2020-02-27 | 2020-02-27 | Intelligent temperature detection system of high-voltage switch cabinet |
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| CN202010122891.3A CN111220288A (en) | 2020-02-27 | 2020-02-27 | Intelligent temperature detection system of high-voltage switch cabinet |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268625A (en) * | 2020-10-16 | 2021-01-26 | 沈阳英特电气科技有限公司 | Switch cabinet temperature rise fault monitoring system |
| CN113297865A (en) * | 2021-05-21 | 2021-08-24 | 贵州电网有限责任公司 | Switch cabinet data management method and system based on RFID temperature tag |
| CN113758609A (en) * | 2020-09-17 | 2021-12-07 | 珠海黑石电气自动化科技有限公司 | Efficient switch cabinet temperature measurement system and implementation method thereof |
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