CN111141411A - Temperature monitoring device for contact of blade type fuse - Google Patents
Temperature monitoring device for contact of blade type fuse Download PDFInfo
- Publication number
- CN111141411A CN111141411A CN202010073722.5A CN202010073722A CN111141411A CN 111141411 A CN111141411 A CN 111141411A CN 202010073722 A CN202010073722 A CN 202010073722A CN 111141411 A CN111141411 A CN 111141411A
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- fuse
- outer cover
- pcb
- temperature
- ceramic outer
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- 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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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a device for monitoring the temperature of a contact of a blade type fuse, which comprises a fuse ceramic outer cover, blade type contacts arranged at two ends of the fuse ceramic outer cover and a wireless passive temperature sensor, wherein the blade type contacts are arranged on the fuse ceramic outer cover; the wireless passive temperature sensor is arranged in the fuse ceramic outer cover, is connected below the top surface through high-temperature glue, is fixed on the part of the knife-shaped contact extending into the fuse ceramic outer cover, and is adhered on the inner side wall of the fuse ceramic outer cover through the high-temperature glue; the wireless passive temperature sensor is provided with a PCB (printed circuit board), an acoustic surface wave element and a radio frequency seat, wherein the acoustic surface wave element is arranged on the PCB, and a radio frequency wire is connected to the PCB through the radio frequency seat and is connected with an external reader after being connected out of a fuse ceramic outer cover; the surface acoustic wave element is internally provided with a piezoelectric substrate on which an interdigital transducer and a reflecting grating are printed. The invention can realize reliable temperature measurement in the whole life cycle of the fuse.
Description
Technical Field
The invention relates to a blade type fuse contact temperature monitoring device used in the field of fuse temperature monitoring.
Background
The blade type fuse is commonly used in a 400V low-voltage power distribution system and has the functions of an isolating switch and a fuse. The two ends of the knife-type fuse are provided with knife-type contacts which are contacted with contact blades on the fuse holder, and the contact blades provide pressing force to clamp the contacts through a spring mechanism.
During operation, the melt itself and the contact resistance of the contact generate heat to raise the temperature of the contact part, so that the contact plate is oxidized and the spring force is weakened. This vicious cycle will reduce the fuse operating current and burn out the fuse holder, reducing the reliability of the power supply. The operation and inspection department usually adopts the maintenance strategy of after maintenance to the fuse, and for the fuse of important load, important position with the infrared point temperature appearance regularly temperature measurement, contact temperature on-line monitoring system has not widely used yet. Under the intelligent trend of distribution networks, a monitoring means is urgently needed to monitor the temperature rise of a contact.
Because the fuse contacts are at much higher voltages than the electronic system, the conventional temperature sensing scheme using thermocouples/thermal resistors is no longer applicable. The Sian electronic technology university adopts a plurality of infrared probes to monitor the temperature of the contact on line. The scheme has higher cost and difficult field installation and debugging, and the temperature error also reaches +/-3 ℃ even in a laboratory environment. The japanese electrical industry research center monitors the contact condition by measuring the change in the magnetic field around the contact with a magneto-optical sensor. This monitoring scheme requires a sufficiently large current at the contacts that monitoring cannot be achieved when the load drops to a threshold value. In addition, a plurality of mechanisms adopt an active wireless method to realize contact temperature measurement, the sensor adopts an active temperature measurement element, the active temperature measurement element is bound on the copper bar in a watchband form, power is supplied to the temperature measurement circuit through battery power supply or induction power from primary current, and data is transmitted back in a wireless mode. Because the contact is smaller and various barriers such as arc extinguishing shields exist on the periphery of the contact, the temperature measuring element is difficult to bind at nearby positions and only can be bound on nearby copper bars, and the measured temperature is difficult to reflect the real temperature of the contact. And the low voltage bus is closer to the alternate distance, installs temperature measuring device additional and can further shorten primary circuit insulation distance, brings extra risk. The traditional surface acoustic wave temperature sensor needs to be matched with a special antenna to work, and is not suitable for occasions with limited space.
With the continuous improvement of the technological level, the application of the surface acoustic wave temperature sensor is gradually popularized. Such temperature sensors generally measure temperature using the principle of detecting a resonance frequency. However, the piezoelectric substrate is used as a core element in the surface acoustic wave sensor, and the surface wave velocity of the piezoelectric substrate is coupled by multiple factors such as temperature, ambient humidity, gas and the like, so that the resonance frequency and the temperature are not in one-to-one correspondence, and when the external package of the sensor is damaged, the temperature measurement precision is influenced to a certain extent. In a long-term temperature measurement occasion, the packaging process, the welding process, the operating environment and the artificial touch of the sensor can damage the packaging and influence the reliability of the temperature measurement result.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device for monitoring the temperature of a contact of a blade type fuse, which can realize reliable temperature measurement in the whole life cycle of the fuse.
One technical scheme for achieving the above purpose is as follows: a temperature monitoring device for a blade type fuse contact comprises a fuse ceramic outer cover, blade type contacts arranged at two ends of the fuse ceramic outer cover and a wireless passive temperature sensor;
the wireless passive temperature sensor is arranged in the fuse ceramic outer cover, is connected below the top surface through high-temperature glue, is fixed on the part of the knife-shaped contact extending into the fuse ceramic outer cover, and is adhered on the inner side wall of the fuse ceramic outer cover through the high-temperature glue;
the wireless passive temperature sensor is provided with a PCB (printed circuit board), an acoustic surface wave element and a radio frequency seat, wherein the acoustic surface wave element is arranged on the PCB, and a radio frequency wire is connected to the PCB through the radio frequency seat and is connected with an external reader after being connected out of a fuse ceramic outer cover;
the surface acoustic wave element is internally provided with a piezoelectric substrate on which an interdigital transducer and a reflecting grating are printed.
Furthermore, insulating filler is filled in the ceramic outer cover of the fuse.
Further, the PCB board adopts heat conduction ceramic or FR4 material.
Further, when the PCB is made of FR4 material, the side surfaces of the PCB and the contact bonding surface are coated with copper, and the PCB area at the bottom of the surface acoustic wave element is also coated with copper.
And further, coating heat-conducting silicone grease on the connecting surface of the surface acoustic wave element and the PCB.
Furthermore, the wireless passive temperature sensors are respectively arranged on the top surface and the bottom surface in the ceramic outer cover, and the wireless passive temperature sensors are respectively fixed on the parts, extending into the ceramic outer cover, of the fuse, of the knife-type contacts on the two sides.
According to the contact temperature monitoring device of the blade type fuse, the wireless passive temperature sensor and the antenna thereof are respectively attached to the inner part of the fuse, and an external reader is used for transmitting an excitation signal and acquiring an echo signal representing temperature information. After installing wireless passive temperature sensor, the fuse overall dimension is unchangeable, need not to change each device position in the switch board, and old distribution device that also can directly pack into of this fuse is used for intelligent transformation. Because the wireless passive temperature sensor is attached to a component which is connected with the contact of the fuse into a whole, and a series of measures for reducing the thermal resistance are adopted, the system can monitor the temperature change condition of the contact in time. The wireless passive temperature sensor is arranged in the fuse, so that the hidden trouble that the switch is damaged by electric arc during operation is avoided. The surface acoustic wave element generally has the problem of multi-parameter coupling, the temperature sensor is sealed in the fuse and surrounded by the filler, so that the temperature sensor can be free from the influence of factors such as environmental humidity, gas, human factors and the like, and the temperature can be reliably measured in the whole life cycle of the fuse after factory calibration.
Drawings
FIG. 1 is a schematic structural diagram of a device for monitoring the temperature of a blade fuse contact according to the present invention;
FIG. 2 is a partial schematic view of a wireless passive temperature sensor of a blade fuse contact temperature monitoring device in accordance with the present invention;
FIG. 3 is a schematic diagram of a Surface Acoustic Wave (SAW) element of a blade fuse contact temperature monitoring device in accordance with the present invention;
fig. 4 is a schematic view illustrating an installation of the device for monitoring the temperature of the blade type fuse contact in the power transformation cabinet.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:
referring to fig. 1 and 2, the blade type fuse with a built-in contact temperature sensor according to the present invention includes a fuse ceramic housing 3 and blade type contacts 1 disposed at two ends of the fuse ceramic housing 3, and the internal space of the fuse ceramic housing 3 is filled with filler for isolating influences of environmental temperature, humidity, gas, human factors, and the like. The upper and lower blade contacts 1 are connected by a melt, which is not shown in the figure for the sake of clarity.
The wireless passive temperature sensor 2 is fixed on the part of the knife-shaped contact 1 extending into the fuse ceramic outer cover 3 in a high-temperature heat-conducting glue bonding mode, and the wireless passive temperature sensor 2 receives radio frequency energy of an external reader through a radio frequency line 8 and an antenna 4 and receives and transmits signals. For simplicity of illustration, fig. 1 shows only the wireless passive temperature sensor 2 and its antenna connected to the upper blade contact 1, and actually, the wireless passive temperature sensor 2 and its antenna connected to the lower blade contact 1 are also provided. The antenna 4 is adhered to the inner wall of the fuse ceramic outer cover 3 by high-temperature glue, and the polarization direction of the antenna is opposite to a receiving and transmitting antenna of an external reader. The antenna 4 in this embodiment adopts a serpentine trace, and various antenna structures can be adopted in practical design.
The wireless passive temperature sensor 2 is made by adopting a surface acoustic wave technology, and comprises a PCB 6, a Surface Acoustic Wave (SAW) element 5 and a radio frequency seat 7. The PCB 6 can be made of heat-conducting ceramic or FR4 material, if FR4 material is adopted, copper is coated on the bonding side of the PCB and the contact in a large area, copper is also coated on the PCB area at the bottom of the Surface Acoustic Wave (SAW) element 5, the two copper-coated surfaces are connected through a plurality of metallized holes, and heat-conducting silicone grease is coated on the end surfaces of the Surface Acoustic Wave (SAW) element 5 and the PCB. The above measures are all to reduce the temperature difference between the Surface Acoustic Wave (SAW) element 5 and the hot spot of the blade-type contact 1, so as to measure the accurate contact point temperature.
Referring to fig. 3, a Surface Acoustic Wave (SAW) element 5 has a piezoelectric substrate 11 encapsulated therein, on which an interdigital transducer 9 and a reflection grating 10 are printed. A radio frequency excitation signal sent by an external reader is captured by the interdigital transducer 9, generates surface acoustic waves in the piezoelectric substrate 11, is enhanced by the reflection grating 10, returns to the interdigital transducer 9, and is converted into a radio frequency echo signal through inverse piezoelectric effect to be sent back. The wave speed of the surface acoustic wave is related to the temperature of the piezoelectric substrate 11, the wave speed determines the resonant frequency of the piezoelectric substrate 11, an external reader emits a series of radio frequency signals with different frequencies, and the resonant frequency is detected through amplitude mutation of echo signals, so that the current sensor temperature is obtained. When a plurality of sensors exist, the sensors can be distinguished by changing the center frequency, adjusting the spacing of the reflecting grids, realizing coding by the width and the like.
Referring to fig. 4, the blade fuses 14 designed according to the present invention are grouped into the blade switch 13 and placed in the distribution cabinet 12 together with the external reader 15. The antenna of the blade fuse 14 and the radio frequency receiving and transmitting antenna of the external reader 15 have the same polarization direction, so that the wireless channel has higher signal-to-noise ratio. The temperature data is uploaded after being summarized by the external reader 15. The remote device evaluates the health condition of the fuse contact by comparing the actual current with the temperature rise data of the contact, and sends out an alarm signal when the temperature rise is abnormal.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. A knife-type fuse contact temperature monitoring device comprises a fuse ceramic outer cover and knife-type contacts arranged at two ends of the fuse ceramic outer cover, and is characterized by further comprising a wireless passive temperature sensor;
the wireless passive temperature sensor is arranged in the fuse ceramic outer cover, is adhered to the lower part of the top surface through high-temperature heat-conducting glue, is fixed on the part of the knife-shaped contact extending into the fuse ceramic outer cover, and is adhered to the inner side wall of the fuse ceramic outer cover through the high-temperature glue;
the wireless passive temperature sensor is provided with a PCB (printed circuit board), an acoustic surface wave element and a radio frequency seat, wherein the acoustic surface wave element is arranged on the PCB, and a radio frequency wire is connected to the PCB through the radio frequency seat and is connected with an external reader after being connected out of a fuse ceramic outer cover;
the surface acoustic wave element is internally provided with a piezoelectric substrate on which an interdigital transducer and a reflecting grating are printed.
2. The device of claim 1, wherein the ceramic housing of the fuse is filled with a filler.
3. The blade fuse contact temperature monitoring device of claim 1, wherein the PCB board is made of thermally conductive ceramic or FR4 material.
4. The device for monitoring the temperature of the blade fuse contact according to claim 3, wherein when the PCB is made of FR4 material, the side surfaces of the PCB and the contact bonding surface are coated with copper, and the PCB area at the bottom of the SAW element is also coated with copper.
5. The device as claimed in claim 4, wherein the surface acoustic wave element is coated with a thermally conductive silicone grease on the surface of the PCB.
6. A blade fuse contact temperature monitoring device according to any one of claims 1 to 5, wherein the wireless passive temperature sensors are provided on the top and bottom surfaces of the ceramic housing, respectively, and are fixed to the portions of the blade contacts on both sides that extend into the ceramic housing of the fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010073722.5A CN111141411A (en) | 2020-01-22 | 2020-01-22 | Temperature monitoring device for contact of blade type fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010073722.5A CN111141411A (en) | 2020-01-22 | 2020-01-22 | Temperature monitoring device for contact of blade type fuse |
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| Publication Number | Publication Date |
|---|---|
| CN111141411A true CN111141411A (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010073722.5A Pending CN111141411A (en) | 2020-01-22 | 2020-01-22 | Temperature monitoring device for contact of blade type fuse |
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| CN (1) | CN111141411A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202903366U (en) * | 2012-12-03 | 2013-04-24 | 德清县供电局 | Passive wireless temperature sensor used for high-voltage environment |
| CN204165670U (en) * | 2014-11-20 | 2015-02-18 | 国家电网公司 | A kind of SAW Temperature Sensors for outdoor high voltage environment |
| CN205748708U (en) * | 2016-06-01 | 2016-11-30 | 苏文电能科技有限公司 | A kind of SAW temperature sensor of replaceable antenna |
| KR20170053163A (en) * | 2017-04-28 | 2017-05-15 | 주식회사 에이엠티솔루션 | Real time Passive temperature method using surface acoustic wave temperature sensor |
| CN107941368A (en) * | 2017-10-10 | 2018-04-20 | 国网浙江省电力公司湖州供电公司 | A kind of electrical equipment detection device based on surface acoustic wave |
| CN207689036U (en) * | 2017-10-10 | 2018-08-03 | 国网浙江省电力公司湖州供电公司 | A kind of temperature-detecting device of the outdoor electrical equipment based on surface acoustic wave |
| CN108519165A (en) * | 2018-05-30 | 2018-09-11 | 广东电网有限责任公司 | A kind of cable bulkhead temperature transducer of calibration-free |
-
2020
- 2020-01-22 CN CN202010073722.5A patent/CN111141411A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202903366U (en) * | 2012-12-03 | 2013-04-24 | 德清县供电局 | Passive wireless temperature sensor used for high-voltage environment |
| CN204165670U (en) * | 2014-11-20 | 2015-02-18 | 国家电网公司 | A kind of SAW Temperature Sensors for outdoor high voltage environment |
| CN205748708U (en) * | 2016-06-01 | 2016-11-30 | 苏文电能科技有限公司 | A kind of SAW temperature sensor of replaceable antenna |
| KR20170053163A (en) * | 2017-04-28 | 2017-05-15 | 주식회사 에이엠티솔루션 | Real time Passive temperature method using surface acoustic wave temperature sensor |
| CN107941368A (en) * | 2017-10-10 | 2018-04-20 | 国网浙江省电力公司湖州供电公司 | A kind of electrical equipment detection device based on surface acoustic wave |
| CN207689036U (en) * | 2017-10-10 | 2018-08-03 | 国网浙江省电力公司湖州供电公司 | A kind of temperature-detecting device of the outdoor electrical equipment based on surface acoustic wave |
| CN108519165A (en) * | 2018-05-30 | 2018-09-11 | 广东电网有限责任公司 | A kind of cable bulkhead temperature transducer of calibration-free |
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Application publication date: 20200512 |