CN114279493A - Local discharge and temperature and humidity acquisition device and monitoring system - Google Patents
Local discharge and temperature and humidity acquisition device and monitoring system Download PDFInfo
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- CN114279493A CN114279493A CN202111505959.7A CN202111505959A CN114279493A CN 114279493 A CN114279493 A CN 114279493A CN 202111505959 A CN202111505959 A CN 202111505959A CN 114279493 A CN114279493 A CN 114279493A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 36
- 238000010897 surface acoustic wave method Methods 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 230000005284 excitation Effects 0.000 claims abstract description 22
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 7
- 230000008054 signal transmission Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003090 exacerbative effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention relates to a partial discharge and temperature and humidity acquisition device and a monitoring system, which comprises a composite communication antenna, a radio frequency switch, an acoustic surface wave sensor excitation signal transmitting circuit, an acoustic surface wave sensor reflection signal receiving circuit, a partial discharge pulse signal receiving circuit, a control processor and a humidity sensor, wherein the input end of the control processor is respectively and electrically connected with the output end of the humidity sensor, the output end of the acoustic surface wave sensor reflection signal receiving circuit and the output end of the partial discharge pulse signal receiving circuit, the output end of the control processor is electrically connected with the input end of the acoustic surface wave sensor excitation signal transmitting circuit, the output end of the surface acoustic wave sensor excitation signal sending circuit, the input end of the surface acoustic wave sensor reflection signal receiving circuit and the input end of the partial discharge pulse signal receiving circuit are electrically connected with the composite communication antenna through the radio frequency switch respectively. The temperature and humidity monitoring system can be used for monitoring local discharge and temperature and humidity information.
Description
Technical Field
The invention relates to the technical field of internal monitoring of power equipment, in particular to a local discharge and temperature and humidity acquisition device, and a local discharge and temperature and humidity monitoring system.
Background
The temperature, the humidity and the partial discharge in the power equipment are strongly coupled. On the one hand, a continuous partial discharge on the insulation system of the electrical equipment causes a local temperature rise in the electrical components or in the joints of the equipment, while a continuous temperature rise also causes a deterioration of the insulation material, thus exacerbating the partial discharge inside the equipment. On the other hand, humidity in the power equipment is also an important factor affecting partial discharge. The insulation damp brought by the internal water vapor and condensation can cause the local breakdown of the insulation air gap. But the humidity cannot be reduced too low, otherwise the static electricity generated can also cause partial discharge accidents.
Patent document CN106643873A discloses a composite detection system of partial discharge and temperature, comprising: a temperature sensor for emitting a temperature signal indicative of a magnitude of a target temperature; a composite sensing antenna for receiving and transmitting signals; the reader is connected with the composite sensing antenna; wherein the reader is configured to: receiving a partial discharge signal generated by the target for a period of time; and transmitting an excitation signal through the composite sensing antenna in another time period to trigger the temperature sensor to transmit the temperature signal and receive the temperature signal. The technical scheme can only monitor the local discharge and the temperature information, but cannot be used for monitoring the local discharge and the temperature and humidity information.
Disclosure of Invention
The invention aims to provide a partial discharge and temperature and humidity acquisition device and a monitoring system, which are used for monitoring partial discharge and temperature and humidity information.
The technical scheme of the invention is as follows:
a local discharge and temperature and humidity acquisition device comprises a composite communication antenna, a radio frequency switch, a surface acoustic wave sensor excitation signal transmitting circuit, a surface acoustic wave sensor reflection signal receiving circuit, a local discharge pulse signal receiving circuit, a control processor and a humidity sensor, the input end of the control processor is respectively and electrically connected with the output end of the humidity sensor, the output end of the acoustic surface wave sensor reflection signal receiving circuit and the output end of the partial discharge pulse signal receiving circuit, the output end of the control processor is electrically connected with the input end of the surface acoustic wave sensor excitation signal sending circuit, the output end of the surface acoustic wave sensor excitation signal sending circuit, the input end of the surface acoustic wave sensor reflection signal receiving circuit and the input end of the partial discharge pulse signal receiving circuit are electrically connected with the composite communication antenna through the radio frequency switch respectively.
Preferably, the operating frequency band of the composite communication antenna is 300 MHz-3 GHz.
Preferably, the humidity sensor is a capacitive humidity sensor.
Preferably, the device also comprises a power supply module, wherein the power supply module is composed of a receiving end resonance coil, a rectifying circuit and a voltage stabilizing circuit, the receiving end resonance coil is electrically connected with the input end of the rectifying circuit, the output end of the rectifying circuit is electrically connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is electrically connected with the power supply end of the control processor, the power supply end of the humidity sensor and the power supply end of the surface acoustic wave sensor excitation signal sending circuit.
Preferably, the receiving end resonance coil is a planar spiral coil made of a hollow conducting wire.
Preferably, the working frequency band of the receiving end resonance coil is 10 MHz-100 MHz.
A partial discharge and temperature and humidity monitoring system comprises an acoustic surface wave sensor, a partial discharge and temperature and humidity acquisition device and a wireless charger; the local discharge and temperature and humidity acquisition device further comprises a power supply module, wherein the power supply module is composed of a receiving end resonance coil, a rectifying circuit and a voltage stabilizing circuit, the receiving end resonance coil is electrically connected with the input end of the rectifying circuit, the output end of the rectifying circuit is electrically connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is electrically connected with the power supply end of the control processor, the power supply end of the humidity sensor and the power supply end of the surface acoustic wave sensor excitation signal sending circuit; the wireless charger comprises an oscillating circuit, a driving circuit and a transmitting end resonance coil, and the transmitting end resonance coil and the receiving end resonance coil can generate electromagnetic coupling resonance.
The transmitting end resonance coil and the receiving end resonance coil can generate electromagnetic coupling resonance requirements: the frequency of the wireless charger is consistent with or close to that of the receiving end resonance coil. The resonant frequency of the receiving end resonant coil is kept within 10 MHz-100 MHz.
Preferably, the temperature and humidity acquisition device further comprises an LORA communication device, the LORA communication device is provided with an RS485 communication interface, the temperature and humidity acquisition device comprises an RS485 level circuit, the control processor is electrically connected with the RS485 level circuit, and the RS485 level circuit is connected with the RS485 communication interface through an RS485 bus.
The invention has the beneficial effects that:
1. the local discharge and temperature and humidity acquisition device is matched with the surface acoustic wave sensor, so that the local discharge and temperature and humidity acquisition operation can be realized. The surface acoustic wave sensor is used for detecting temperature, has the characteristics of being passive and wireless, and can overcome the difficulties of complex internal structure and more temperature change points of power equipment. If a common active temperature sensor is used, a battery needs to be configured, and the battery needs to be replaced by power failure at irregular intervals, and the risk of battery explosion exists. The ultrahigh frequency pulse signal can be radiated in the partial discharge process, the composite communication antenna is used for receiving the partial discharge pulse signal to detect partial discharge, the device can be installed under the condition that the running state of the device is not changed, the device condition is monitored on line in real time, and the device has high sensitivity and extremely strong anti-interference capability.
2. The ambient radio waves are generally less than 300MHz, and the operating frequency band of the composite communication antenna is 300 MHz-3 GHz, which can be distinguished from the ambient radio waves.
3. The capacitance type humidity sensor has the advantages of good linearity, good repeatability, small lag, fast response and small size.
4. The local discharge and temperature and humidity acquisition device adopts a wireless power supply mode, and can adopt a magnetic coupling resonant mode wireless charging mode to supply power for the acquisition device, so that a battery is not required to be arranged at the acquisition device, and the maintenance cost is low. The magnetic coupling resonant wireless charging has higher energy transmission efficiency, can realize medium-distance efficient electric energy transmission, and can ensure higher transmission efficiency. In addition, the magnetic coupling resonant wireless charging takes a magnetic field as a transmission medium, so that the magnetic coupling resonant wireless charging does not harm human bodies.
5. The planar spiral coil has a small structure and occupies a small space, so that the partial discharge and temperature and humidity acquisition device is small in size.
6. The working frequency band of the resonance coil at the receiving end is 10 MHz-100 MHz, so that the wireless charging energy consumption loss is less, and the energy transfer effect is good.
The LORA wireless communication technology has the advantages of low power consumption, long communication distance and large coverage area.
Detailed Description
The following examples are presented to illustrate the present invention and to assist those skilled in the art in understanding and practicing the present invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.
A partial discharge and temperature and humidity monitoring system comprises an acoustic surface wave sensor, a partial discharge and temperature and humidity acquisition device, a wireless charger and an LORA communication device.
Wherein, the local discharge and temperature and humidity acquisition device comprises a composite communication antenna, a radio frequency switch, an acoustic surface wave sensor excitation signal transmitting circuit, an acoustic surface wave sensor reflection signal receiving circuit, a local discharge pulse signal receiving circuit, a control processor, a humidity sensor and a power supply module, the input end of the control processor is respectively and electrically connected with the output end of the humidity sensor, the output end of the acoustic surface wave sensor reflection signal receiving circuit and the output end of the local discharge pulse signal receiving circuit, the output end of the control processor is electrically connected with the input end of the acoustic surface wave sensor excitation signal transmitting circuit, the output end of the surface acoustic wave sensor excitation signal sending circuit, the input end of the surface acoustic wave sensor reflection signal receiving circuit and the input end of the partial discharge pulse signal receiving circuit are electrically connected with the composite communication antenna through the radio frequency switch respectively. The power supply module is composed of a receiving end resonance coil, a rectification circuit and a voltage stabilizing circuit, wherein the receiving end resonance coil is electrically connected with the input end of the rectification circuit, the output end of the rectification circuit is electrically connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is electrically connected with the power end of the control processor, the power end of the humidity sensor and the power end of the surface acoustic wave sensor excitation signal sending circuit.
In this embodiment, the temperature and humidity acquisition device comprises an RS485 level circuit, the control processor is electrically connected with the RS485 level circuit,
in this embodiment, the operating frequency band of the composite communication antenna is 300MHz to 3 GHz.
In this embodiment, the humidity sensor is a capacitive humidity sensor.
In this embodiment, the receiving-end resonance coil is a planar spiral coil made of a hollow conductive wire.
In this embodiment, the working frequency band of the resonant coil at the receiving end is 10MHz to 100 MHz.
The wireless charger comprises an oscillating circuit, a driving circuit and a transmitting end resonance coil, and the transmitting end resonance coil and a receiving end resonance coil can generate electromagnetic coupling resonance. The transmitting end resonance coil and the receiving end resonance coil can generate electromagnetic coupling resonance requirements: the frequency of the wireless charger is consistent with or close to that of the receiving end resonance coil. The resonant frequency of the receiving end resonant coil is kept within 10 MHz-100 MHz.
Wherein, LORA communication device has RS485 communication interface, and RS485 level circuit passes through RS485 bus connection with RS485 communication interface.
During the use, the surface acoustic wave sensor can set up a plurality ofly, sets up the position that needs the detection at power equipment respectively. The composite communication antenna is provided inside the power equipment and at a position where the composite communication antenna can receive the partial discharge pulse signal. The sensitive element of the humidity sensor is arranged inside the power equipment.
And respectively acquiring temperature and partial discharge information by using a time-sharing multiplexing strategy.
When collecting temperature information, the control treater control radio frequency switch communicates surface acoustic wave sensor excitation signal transmitting circuit and composite communication antenna, and the control treater drives and transports surface acoustic wave sensor excitation signal transmitting circuit and sends surface acoustic wave sensor excitation signal to through the corresponding electromagnetic wave of composite communication antenna output, control treater control radio frequency switch intercommunication surface acoustic wave sensor reflection signal receiving circuit and composite communication antenna, surface acoustic wave sensor response surface acoustic wave sensor excitation signal, output surface acoustic wave sensor reflection signal, composite communication antenna receives surface acoustic wave sensor reflection signal to after surface acoustic wave sensor reflection signal receiving circuit handles, input control treater.
When the partial discharge information is collected, the control processor controls the radio frequency switch to be communicated with the partial discharge pulse signal receiving circuit and the composite communication antenna, if the partial discharge phenomenon exists, the partial discharge phenomenon excites the partial discharge pulse signal, and the composite communication antenna receives the partial discharge pulse signal, inputs the partial discharge pulse signal into the control processor after being processed by the partial discharge pulse signal receiving circuit. If the partial discharge phenomenon does not exist, the composite communication antenna cannot receive the partial discharge pulse signal.
When the humidity information is collected, the digital signal output by the humidity sensor is directly input into the control processor.
The present invention is described in detail with reference to the examples. It should be understood that in practice the description of all possible embodiments is not exhaustive and that the inventive concepts are described herein as far as possible by way of illustration. Without departing from the inventive concept of the present invention and without any creative work, a person skilled in the art should, in all of the embodiments, make optional combinations of technical features and experimental changes of specific parameters, or make a routine replacement of the disclosed technical means by using the prior art in the technical field to form specific embodiments, which belong to the content implicitly disclosed by the present invention.
Claims (8)
1. A local discharge and temperature and humidity acquisition device is characterized by comprising a composite communication antenna, a radio frequency switch, an acoustic surface wave sensor excitation signal transmitting circuit, an acoustic surface wave sensor reflection signal receiving circuit, a local discharge pulse signal receiving circuit, a control processor and a humidity sensor, the input end of the control processor is respectively and electrically connected with the output end of the humidity sensor, the output end of the acoustic surface wave sensor reflection signal receiving circuit and the output end of the partial discharge pulse signal receiving circuit, the output end of the control processor is electrically connected with the input end of the surface acoustic wave sensor excitation signal sending circuit, the output end of the surface acoustic wave sensor excitation signal sending circuit, the input end of the surface acoustic wave sensor reflection signal receiving circuit and the input end of the partial discharge pulse signal receiving circuit are electrically connected with the composite communication antenna through the radio frequency switch respectively.
2. The partial discharge and temperature and humidity acquisition device according to claim 1, wherein the operating frequency band of the composite communication antenna is 300MHz to 3 GHz.
3. The partial discharge and temperature and humidity acquisition device according to claim 1, wherein the humidity sensor is a capacitive humidity sensor.
4. The partial discharge and temperature and humidity acquisition device according to claim 1, further comprising a power supply module, wherein the power supply module is composed of a receiving end resonance coil, a rectification circuit and a voltage stabilizing circuit, the receiving end resonance coil is electrically connected with an input end of the rectification circuit, an output end of the rectification circuit is electrically connected with an input end of the voltage stabilizing circuit, and an output end of the voltage stabilizing circuit is electrically connected with a power supply end of the control processor, a power supply end of the humidity sensor and a power supply end of the surface acoustic wave sensor excitation signal transmission circuit.
5. The partial discharge and temperature and humidity acquisition device according to claim 4, wherein the receiving end resonance coil is a planar spiral coil made of hollow conducting wires.
6. The partial discharge and temperature and humidity acquisition device according to claim 4, wherein the operating frequency band of the receiving end resonance coil is 10 MHz-100 MHz.
7. A partial discharge and temperature and humidity monitoring system comprises a surface acoustic wave sensor and a wireless charger, and is characterized by further comprising a partial discharge and temperature and humidity acquisition device according to any one of claims 1-3; the local discharge and temperature and humidity acquisition device further comprises a power supply module, wherein the power supply module is composed of a receiving end resonance coil, a rectifying circuit and a voltage stabilizing circuit, the receiving end resonance coil is electrically connected with the input end of the rectifying circuit, the output end of the rectifying circuit is electrically connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is electrically connected with the power supply end of the control processor, the power supply end of the humidity sensor and the power supply end of the surface acoustic wave sensor excitation signal sending circuit; the wireless charger comprises an oscillating circuit, a driving circuit and a transmitting end resonance coil, and the transmitting end resonance coil and the receiving end resonance coil can generate electromagnetic coupling resonance.
8. The partial discharge and temperature and humidity monitoring system according to claim 7, further comprising a LORA communication device, wherein the LORA communication device has an RS485 communication interface, the temperature and humidity acquisition device includes an RS485 level circuit, the control processor is electrically connected to the RS485 level circuit, and the RS485 level circuit is connected to the RS485 communication interface through an RS485 bus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111505959.7A CN114279493A (en) | 2021-12-10 | 2021-12-10 | Local discharge and temperature and humidity acquisition device and monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111505959.7A CN114279493A (en) | 2021-12-10 | 2021-12-10 | Local discharge and temperature and humidity acquisition device and monitoring system |
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| CN114279493A true CN114279493A (en) | 2022-04-05 |
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| CN103227514A (en) * | 2013-03-20 | 2013-07-31 | 杭州休普电子技术有限公司 | Electromagnetic resonance wireless sensor |
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| CN204479206U (en) * | 2015-04-08 | 2015-07-15 | 国家电网公司 | A kind of wireless and passive temperature measuring equipment based on surface acoustic wave and system |
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| CN110850247A (en) * | 2019-11-26 | 2020-02-28 | 国网辽宁省电力有限公司朝阳供电公司 | Partial discharge monitoring system |
| CN112924821A (en) * | 2021-01-25 | 2021-06-08 | 广东电网有限责任公司广州供电局 | Composite detection system and method for electric power equipment discharge and heating defect detection |
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2021
- 2021-12-10 CN CN202111505959.7A patent/CN114279493A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227514A (en) * | 2013-03-20 | 2013-07-31 | 杭州休普电子技术有限公司 | Electromagnetic resonance wireless sensor |
| CN204202623U (en) * | 2014-10-08 | 2015-03-11 | 南京航空航天大学 | A kind of system strengthening surface acoustic wave transducing signal intensity |
| CN204479206U (en) * | 2015-04-08 | 2015-07-15 | 国家电网公司 | A kind of wireless and passive temperature measuring equipment based on surface acoustic wave and system |
| CN106643873A (en) * | 2016-11-08 | 2017-05-10 | 国网辽宁省电力有限公司电力科学研究院 | Partial discharge and temperature composite detection system and method |
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