CN111721434B - Distribution bus connector heating sensor - Google Patents
Distribution bus connector heating sensor Download PDFInfo
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- CN111721434B CN111721434B CN202010621061.5A CN202010621061A CN111721434B CN 111721434 B CN111721434 B CN 111721434B CN 202010621061 A CN202010621061 A CN 202010621061A CN 111721434 B CN111721434 B CN 111721434B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/02—Measuring temperature based on the expansion or contraction of a material the material being a liquid
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Abstract
本发明提供一种配电母线接头发热传感器，包括壳体、面板、酒精柱、刻度、环形玻管、环形透镜、线路板一、线路板二、套筒、连杆、屏蔽盒、定片支架、动片支架、定片组、动片组、绝缘托、伸缩盒、背光片、罩一、环罩二、聚热盒、受热片、框形支架、感应线圈、撑脚、软管、LED、整流电路、滤波电路、稳压电路、条码存储器、条码调制电路、蓄电池、可变电容、电感和晶体管，壳体、隔板、屏蔽盒、框形支架、盒一、盒二、环罩一、环罩二和撑脚构成支架机构，环形玻管、酒精柱、环形透镜、背光片和刻度构成读数机构，受热片、伸缩盒、连杆、定片组和动片组构成传感机构，本传感器可减轻工作人员的劳动强度、通过载波传输进行远程检测。
The invention provides a heat distribution bus joint heating sensor, which comprises a shell, a panel, an alcohol column, a scale, an annular glass tube, an annular lens, a circuit board, a second circuit board, a sleeve, a connecting rod, a shielding box, and a stator bracket , moving film bracket, fixed film group, moving film group, insulating bracket, telescopic box, backlight film, cover one, ring cover two, heat collecting box, heating plate, frame bracket, induction coil, support foot, hose, LED , rectifier circuit, filter circuit, voltage stabilizer circuit, barcode memory, barcode modulation circuit, battery, variable capacitor, inductor and transistor, shell, partition, shielding box, frame bracket, box one, box two, ring cover one , the second ring cover and the supporting feet constitute the bracket mechanism, the annular glass tube, the alcohol column, the annular lens, the backlight film and the scale constitute the reading mechanism, and the heating plate, the telescopic box, the connecting rod, the fixed plate group and the moving plate group constitute the sensing mechanism. The sensor can reduce the labor intensity of the staff and carry out remote detection through carrier transmission.
Description
Technical Field
The invention relates to a temperature sensor for detecting a power distribution bus, in particular to a heating sensor for a joint of a power distribution bus, and belongs to the technical field of power monitoring.
Background
The distribution bus is a basic component of a power transformer, a distribution room or a distribution room, for a small distribution room, the supply current is small, the heating condition of a low-voltage distribution bus joint does not need to be monitored, but for industrial and mining enterprises with large motors or industrial electric furnaces, such as mining mines, gravel yards, steel mills, steel works, brick and tile plants, harbors and the like, the energy consumption is high, the working current of dynamic electricity is large, the current intensity of secondary low-voltage distribution buses of the power transformer is often over 100 amperes for some electrical appliances working under the voltage of 380 volts of alternating current, and the current intensity of some electrical appliances can reach hundreds of amperes Scorching or smoking; and secondly, regular itinerant detection is carried out through the handheld infrared thermometer, the former has the defects that the visual precision is very low, the specific temperature of the joint cannot be known, and the latter has the defects that the labor intensity is high, and workers need to frequently walk back and forth in a power distribution room.
Disclosure of Invention
The invention aims to provide a sensor which has relatively high measurement precision, can reduce the labor intensity of workers and can remotely monitor the heating of a power distribution bus joint.
The technical problem to be solved by the invention is realized by the following technical scheme: the sensor comprises a shell 1, a panel 2, an alcohol column 3, scales 4, an annular glass tube 5, an annular lens 6, a first circuit board 7, a first box 8, balls 9, a sleeve 10, a partition plate 12, a connecting rod 13, a shielding box 14, a stator support 15, a stator set 16, a rotor set 17, a rotor support 18, an insulating support 19, a second box 21, a second circuit board 22, a telescopic box 24, a backlight sheet 25, a second ring cover 27, a contact 28, a heat gathering box 29, a heated sheet 30, a frame-shaped support 34, a liquid outlet 35, an induction coil 36, a first ring cover 37, a supporting foot 39, a hose 40, an LED41, a groove 42, a rectifying circuit 43, a filter circuit 44, a voltage stabilizing circuit 45, a bar code memory 46, a bar code modulation circuit 47, a storage battery 49, a variable capacitor C, an inductor L and a transistor T.
The shell 1, the partition plate 12, the shielding box 14, the frame-shaped support 34, the first box 8, the second box 21, the first ring cover 37, the second ring cover 27 and the supporting foot 39 form a support mechanism, the annular glass tube 5, the alcohol column 3, the annular lens 6, the backlight sheet 25 and the scale 4 form a reading mechanism, and the heated sheet 30, the telescopic box 24, the connecting rod 13, the fixed sheet group 16 and the movable sheet group 17 form a sensing mechanism.
A horn-shaped heat gathering box 29 is arranged in the center of the bottom of the shell 1, the opening of the heat gathering box 29 is downward, a corrugated telescopic box 24 is arranged above the heat gathering box 29, a plurality of heat receiving sheets 30 are arranged at the bottom of the telescopic box 24, black titanium film layers which can easily absorb heat are plated on the inner wall of the heat gathering box 29, the bottom of the telescopic box 24 and the surfaces of the heat receiving sheets 30, a liquid outlet 35 is arranged on one side of the bottom of the telescopic box 24, an annular lens 6 is arranged on the panel 2, the cross section of the annular lens 6 is in a horizontal mushroom shape, the head of a mushroom is in a semi-elliptical shape, the mushroom rod is embedded in a corresponding slot on the panel 2, an annular groove 42 is arranged in the mushroom rod of the annular lens 6, an annular glass tube 5 is embedded in the groove 42, one end of the annular glass tube 5 is sealed and is in vacuum, the other end of the annular glass tube 5 is provided with an opening and is connected with the liquid outlet 35 through a hose 40, the telescopic box 24 is filled with red alcohol, and a small amount of alcohol overflows into the annular glass tube 5 to form an arc-shaped alcohol column 3, the panel 2 is provided with a plurality of convex strip-shaped scales 4 outside the excircle of the annular lens 6, the convex strip-shaped scales are embedded in corresponding grooves on the panel 2, the back of the panel 2 is provided with an annular backlight piece 25 at the corresponding position of the scales 4, and the top of the backlight piece 25 is provided with an LED41 which can lighten the scales 4.
An inductance three-point type oscillating circuit is arranged on the second circuit board 22, the oscillating circuit, the decoupling circuit and the C4 form a first carrier circuit, a carrier signal is loaded to the contact 28, namely the second bus section 26, through the C4, a second carrier circuit is formed by the bar code memory 46, the bar code modulation circuit 47, the capacitor C6 and the resistor R6, bar code information in the bar code memory 46 represents the geographic position and the voltage phase of the bus joint, the information of the bar code memory 46 is read and modulated by the bar code modulation circuit 47, and the formed carrier signal is loaded to the contact 28, namely the second bus section 26, through the capacitor C6 and the resistor R6.
When a large current exists in the bus, the contact resistance of the bus joint generates temperature at the gasket 33, the screw 31 and the nut 32, the temperature reaches the bottom of the telescopic box 24 according to the hot air rising principle on one hand, and is transmitted to the bottom of the telescopic box 24 according to the heat radiation principle on the other hand, under the action of the heated sheet 30 and the black coating, the telescopic box 24 is effectively heated, the telescopic box 24 and alcohol thereof are heated and expanded, the distance between the top and the bottom of the telescopic box 24 is increased, the top of the telescopic box 24 is transmitted through the connecting rod 13, the insulating support 19 and the moving sheet support 18, the moving sheet group 17 moves upwards, the capacitance of the variable capacitor C is increased, the oscillation frequency of the oscillation circuit is reduced, the frequency of a carrier signal loaded on the bus by the carrier circuit is lower, meanwhile, the heating expansion of the telescopic box 24 and the alcohol thereof increases the alcohol overflowing into the annular glass tube 5, the, the temperature indication value on the scale 4 rises.
If the contact resistance of the bus joint is small, or the current intensity in the bus is reduced, the temperature of the bus joint is reduced, the telescopic box 24 and the alcohol thereof release heat and shrink, the distance between the top and the bottom of the telescopic box 24 is reduced, the top of the telescopic box 24 is transmitted through the connecting rod 13, the insulating support 19 and the moving plate support 18, the moving plate group 17 moves downwards, the capacitance of the variable capacitor C is reduced, the oscillation frequency of the oscillation circuit is increased, the carrier signal frequency loaded on the bus by the carrier circuit is higher, meanwhile, the alcohol overflowing into the annular glass tube 5 is less due to the shrinkage of the telescopic box 24 and the alcohol thereof, the arc length of the alcohol column 3 is reduced, and the temperature indicated value on the scale 4 is reduced.
The signal frequency of the first carrier circuit on the bus is in inverse proportion to the temperature of a bus joint, the higher the temperature of the bus joint is, the lower the signal frequency is, the lower the temperature of the bus joint is, the higher the signal frequency is, the carrier signal generated on the bus by the first carrier circuit is a frequency modulation signal, the carried temperature information is an analog signal, the frequency of the carrier signal is continuously changed, the carrier signal generated on the bus by the second carrier circuit is also a frequency modulation signal, the carried bar code information is a digital signal and consists of 0 and 1, the frequency of the carrier signal is in step change, the lower carrier frequency represents 0, the higher carrier frequency represents 1, the buses at different positions use different carrier frequency differences, the buses at different positions and different phases use different bar codes, and the first carrier circuit and the second carrier circuit use different carrier frequency bands.
The carrier receiving device matched with the sensor finishes the tasks of receiving, processing and displaying sensing signals, the carrier receiving device at least comprises a double-path frequency selection circuit 51, a double-path high-frequency amplification circuit 52, a double-path frequency discrimination circuit 53, a power supply circuit 54, a low-frequency amplification circuit 55, a communication circuit 56, a computer 57 and a display 58, the double-path frequency selection circuit 51 is used for separating signals of a carrier circuit I and a carrier circuit II, the double-path frequency discrimination circuit 53 respectively detects temperature information and bar code information on the carrier signals, the temperature information is sent to an acquisition card in the computer 57 through the low-frequency amplification circuit 55 and converted into digital signals by the acquisition card, the bar code information is sent to a USB port of the computer 57 through the communication circuit 56, under the support of relevant software, the computer 57 analyzes and processes the converted temperature information and the communicated bar code information, and finally displays the result on the display 58.
Due to the adoption of the technical scheme, the invention has the advantages and positive effects that: the measurement accuracy of the distribution bus joint heating sensor is relatively high, the labor intensity of workers can be reduced, the heating condition of the distribution bus joint can be remotely monitored, and the distribution bus joint heating sensor can be used for internal distribution rooms of enterprises with high energy consumption, such as mining mines, gravel yards, steel mills, steel plants, brick plants, harbor wharfs and the like.
Drawings
The invention is further illustrated with reference to the following figures and examples, the invention having the following 6 figures:
figure 1 is a front view of the present sensor,
figure 2 is a front cross-sectional view of the present sensor,
figure 3 is a right side view of the present sensor,
figure 4 is a block diagram of the components of the first circuit board,
figure 5 is a circuit schematic diagram of a second circuit board,
fig. 6 is a block diagram of a carrier receiving apparatus.
The numbers indicated in the figures represent the following, respectively:
1. the LED lamp comprises a shell, a panel, a 3 alcohol column, a 4 scale, a 5 annular glass tube, a 6 annular lens, a 7 circuit board I, a 8 box I, a 9 ball, a 10 sleeve, a 11 side pin, a 12 baffle, a 13 connecting rod, a 14 shielding box, a 15 stator plate bracket, a 16 stator plate group, a 17 movable plate group, a 18 movable plate bracket, a 19 insulating bracket, a 20 rivet, a 21 box II, a 22 circuit board II, a 23 carrier output end, a 24 telescopic box, a 25 backlight, a 26 bus section II, a 27 ring cover II, a 28 contact, a 29 heat collecting box, a 30 heated plate, a 31 screw, a 32 nut, a 33 gasket, a 34 frame bracket, a 35, a 36 induction coil, a 37 bus cover I, a 38 bus section I, a 39 support pin, a 40 hose, a 41 LED, a 42 groove, a 43 rectifier circuit, a 44 filter circuit, 45. the system comprises a voltage stabilizing circuit, 46 a bar code memory, 47 a bar code modulation circuit, 48 a modulation output end, 49 a storage battery, 50 a power line, 51 a double-channel frequency selection circuit, 52 a double-channel high-frequency amplification circuit, 53 a double-channel frequency discrimination circuit, 54 a power circuit, 55 a low-frequency amplification circuit, 56 a communication circuit, 57 a computer, 58 a display, C, a variable capacitor, C1, a capacitor, C2., C3., C4, C5., C6., C7., R1, resistor, R2, resistor, R3, resistor, R4, R5., R6., L, inductor, T, transistor and Vcc.
Detailed Description
1. The sensor comprises a shell 1, a panel 2, an alcohol column 3, scales 4, an annular glass tube 5, an annular lens 6, a first circuit board 7, a first box 8, balls 9, a sleeve 10, a partition plate 12, a connecting rod 13, a shielding box 14, a stator support 15, a stator set 16, a rotor set 17, a rotor support 18, an insulating support 19, a second box 21, a second circuit board 22, a telescopic box 24, a backlight sheet 25, a second ring cover 27, a contact 28, a heat gathering box 29, a heated sheet 30, a frame-shaped support 34, a liquid outlet 35, an induction coil 36, a first ring cover 37, a supporting foot 39, a hose 40, an LED41, a groove 42, a rectifying circuit 43, a filter circuit 44, a voltage stabilizing circuit 45, a bar code memory 46, a bar code modulation circuit 47, a storage battery 49, a variable capacitor C, an inductor L and a transistor T.
2. According to fig. 1 to 3, the housing 1, the partition plate 12, the shielding box 14, the frame-shaped support 34, the first box 8, the second box 21, the first ring cover 37, the second ring cover 27 and the support 39 form a support mechanism, the annular glass tube 5, the alcohol column 3, the annular lens 6, the backlight 25 and the scale 4 form a reading mechanism, and the heated plate 30, the telescopic box 24, the connecting rod 13, the fixed plate group 16 and the movable plate group 17 form a sensing mechanism.
3. The central portion of the bottom of the shell 1 is provided with a horn-shaped heat collecting box 29 with a downward opening, a corrugated telescopic box 24 is arranged above the heat collecting box 29, the bottom of the telescopic box 24 is provided with a plurality of heat receiving sheets 30, the inner wall of the heat collecting box 29, the bottom of the telescopic box 24 and the surfaces of the heat receiving sheets 30 are all plated with black titanium film layers which can easily absorb heat, the thickness of the plating layers is 0.15-0.22 mm, and one side of the bottom of the telescopic box 24 is provided with a liquid outlet 35.
4. The panel 2 is provided with an annular lens 6, the annular lens 6 is made of organic glass, the cross section of the annular lens 6 is in a horizontal mushroom shape, the mushroom head is in a semi-ellipse shape, the mushroom stem is embedded in a corresponding groove on the panel 2, an annular groove 42 is arranged in the mushroom stem of the annular lens 6, an annular glass tube 5 is embedded in the groove 42, one end of the annular glass tube 5 is sealed and vacuum in the tube, the other end of the annular glass tube 5 is provided with an opening and is connected with a liquid outlet 35 through a hose 40, a telescopic box 24 is filled with red alcohol, a small amount of alcohol overflows into the annular glass tube 5 to form an arc alcohol column 3, the annular lens 6 plays an amplifying role, so that an observer can clearly see the length of the alcohol column 3 at a far position, a plurality of raised line-shaped scales 4 are arranged on the panel 2 and outside the excircle of the annular lens 6, the raised line-shaped scales are embedded in the corresponding groove on the panel 2, the back of the panel 2 is provided with an annular backlight 25 corresponding to the scale 4, the top of the backlight 25 is provided with an LED41 to make the scale 4 shine, and the annular shape is not a complete ring but a notched annular shape.
5. The waist in the body 1 is equipped with the horizontal baffle 12, the baffle 12 is set up as the edge leg 11 and connected with body 1 inner wall on both sides, the baffle 12 center has bush 10, the bush 10 inner wall has three ball cave and every ball cave embeds has the ball 9 that can rotate, three ball 9 is arranged into the shape on the top view, namely three ball 9 is arranged according to 120 degrees angle in the bush 10, namely the upper side of the baffle 12 is equipped with the shielding box 14 above the bush 10, the bottom of the shielding box 14 is set up as the hem and is connected with baffle 12 through the rivet 20, the shielding box 14 inner top is equipped with the stator support 15, the stator support 15 fixes the top of the stator set 16, the telescopic box 24 upper and in the bush 10 are equipped with the connecting rod 13 that can move up and down, the bottom of the connecting rod 13 is connected with the top of the telescopic box 24, the connecting rod 13 upper and in the shielding box 14 are equipped with the rotor support 18, the rotor support 18 bottom is connected with, the moving plate bracket 18 fixes the bottom of the moving plate group 17, the moving plate group 17 inserts each plate into the gap of each plate of the stator plate group 16 in a staggered way, and the moving plate group 17 and the stator plate group 16 form a variable capacitor C.
6. According to fig. 2 to 5, a first box 8 and a second box 21 are respectively arranged below the partition plate 12 and on two sides of the telescopic box 24, a first circuit board 7 is arranged in the first box 8, a rectifying circuit 43, a filter circuit 44, a voltage stabilizing circuit 45, a bar code memory 46, a bar code modulation circuit 47 and a storage battery 49 are arranged on the first circuit board 7, a second circuit board 22 is arranged in the second box 21, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, an inductor L and a transistor T are arranged on the second circuit board 22, the moving plate group 17 is connected with one end of the inductor L through a moving plate bracket 18 and a shielding wire, the fixed plate group 16 is connected with the other end of the inductor L through a fixed plate bracket 15, a shielding box 14, a rivet 20 and a conducting wire, the variable capacitor C, the capacitor C2, the capacitor C3, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the capacitor R3, the other end of the capacitor L is connected with the other end of the inductor L, The inductor L and the transistor T form an inductor three-point type oscillating circuit, a feedback signal is injected into an emitter of the transistor T through a capacitor C3 and a resistor R4, a decoupling circuit is formed by a capacitor C1, a resistor R5 and a capacitor C5, the decoupling circuit, the oscillating circuit and the C4 form a first carrier circuit, and the carrier signal is loaded to a contact 28, namely a second bus section 26 through C4.
7. The bar code memory 46, the bar code modulation circuit 47, the capacitor C6 and the resistor R6 form a second carrier circuit, bar code information in the bar code memory 46 represents the geographic position and the voltage phase of the bus connector, the information of the bar code memory 46 is read out and modulated by the bar code modulation circuit 47, and the formed carrier signal is loaded to the contact 28, namely the second bus section 26, through the capacitor C6 and the resistor R6; a frame-shaped support 34 is arranged below the shell 1, the frame-shaped support 34 is rectangular in plan view, the bottom of the shell 1 is connected with the frame-shaped support 34, a first ring cover 37 and a second ring cover 27 are respectively arranged below two sides of the frame-shaped support 34, an induction coil 36 with a silicon steel sheet core is arranged in the first ring cover 37, two ends of the induction coil 36 are connected with an alternating current input end of the rectifying circuit 43 through conducting wires, the first ring cover 37 and the induction coil 36 are sleeved outside the first bus section 38, the connecting point 28 is a round head screw fixed on the second bus section 26, and the second ring cover 27 is sleeved outside the connecting point 28 and the second bus section 26.
8. The first bus section 38 and the second bus section 26 are buses, the first bus section 38 and the second bus section 26 are connected through a gasket 33, a screw 31 and a nut 32 to form a bus joint, when a large current exists in the buses, the contact resistance of the bus joint generates temperature at the gasket 33, the screw 31 and the nut 32, the temperature reaches the bottom of the telescopic box 24 according to the hot air rising principle on one hand, and is transmitted to the bottom of the telescopic box 24 according to the heat radiation principle on the other hand, under the action of a heated sheet 30 and a black coating, the telescopic box 24 is effectively heated, the telescopic box 24 and alcohol thereof are heated to expand, the distance between the top and the bottom of the telescopic box 24 is increased, the top of the telescopic box 24 is transmitted through the connecting rod 13, the insulating support 19 and the movable sheet support 18, the movable sheet set 17 moves upwards, the capacitance of the variable capacitor C is increased, and the oscillation frequency of the oscillation circuit is increasedf 0≈1/[2πLC1/2]The oscillation frequency of the oscillation circuit is reduced, the frequency of a carrier signal loaded on a bus by the carrier circuit is lower, and meanwhile, the alcohol overflowing into the annular glass tube 5 is increased due to the expansion of the telescopic box 24 and the alcohol, the arc length of the alcohol column 3 is increased, and the temperature indicated value on the scale 4 is increased.
9. If the contact resistance of the bus joint is small, or the current intensity in the bus is reduced, the temperature of the bus joint is reduced, the telescopic box 24 and the alcohol thereof release heat and shrink, the distance between the top and the bottom of the telescopic box 24 is reduced, the top of the telescopic box 24 is transmitted through the connecting rod 13, the insulating support 19 and the moving plate support 18, the moving plate group 17 moves downwards, the capacitance of the variable capacitor C is reduced, the oscillation frequency of the oscillation circuit is increased, the carrier signal frequency loaded on the bus by the carrier circuit is higher, meanwhile, the alcohol overflowing into the annular glass tube 5 is less due to the shrinkage of the telescopic box 24 and the alcohol thereof, the arc length of the alcohol column 3 is reduced, and the temperature indicated value on the scale 4 is reduced.
10. The signal frequency of the first carrier circuit on the bus is in inverse proportion to the temperature of a bus joint, the higher the temperature of the bus joint is, the lower the signal frequency is, the lower the temperature of the bus joint is, the higher the signal frequency is, the carrier signal generated on the bus by the first carrier circuit is a frequency modulation signal, the carried temperature information is an analog signal, the frequency of the carrier signal is continuously changed, in order to reduce environmental interference, the carrier signal generated on the bus by the second carrier circuit is also a frequency modulation signal, the carried bar code information is a digital signal and consists of 0 and 1, the frequency of the carrier signal is in step change, the lower carrier frequency represents 0, the higher carrier frequency represents 1, the buses at different positions use different carrier frequency differences, the buses at different positions and different phases use different bar codes, and the first carrier circuit and the second carrier circuit use different carrier frequency bands, the carrier frequency difference is a small fraction of the carrier frequency band.
11. According to fig. 6, the sensor needs to be additionally provided with a carrier receiving device to complete the receiving, processing and displaying tasks of the sensing signal, the carrier receiving device at least comprises a two-way frequency selecting circuit 51, a two-way high-frequency amplifying circuit 52, a two-way frequency discrimination circuit 53, a power supply circuit 54, a low-frequency amplifying circuit 55, a communication circuit 56, a computer 57 and a display 58, the two-way frequency selecting circuit 51 is used for separating the signals of the first carrier circuit and the second carrier circuit, the two-way frequency discrimination circuit 53 respectively detects the temperature information and the bar code information on the carrier signals, the temperature information is sent to an acquisition card in the computer 57 through the low-frequency amplifying circuit 55 and is converted into digital signals by the acquisition card, the bar code information is sent to a USB port of the computer 57 through the communication circuit 56, under the support of related software, the computer 57 analyzes and processes the converted temperature information and the bar code information communicated, the overall monitoring of the bus bar connection already fitted with the present sensor is finally displayed in different geographical positions and different voltage phases on the display 58.
12. When current exists in the bus, alternating current generates an alternating magnetic field around the bus and induced electromotive force is generated in the induction coil 36, the induced electromotive force enables two ends of the induction coil 36 to form alternating voltage, the alternating voltage passes through the rectifying circuit 43, the filter circuit 44 and the voltage stabilizing circuit 45 and then provides power for the circuit board and charges the storage battery 49, the current in the bus is generally large and is often tens of amperes, and the alternating magnetic field outside the bus is strong, so that the energy output by the induction coil 36 can provide power for the circuit board and charge the storage battery 49, and the storage battery is miniature and can be replaced by a rechargeable battery.
13. The purpose of adopting the corrugated expansion box is that the corrugated expansion box can contain more alcohol, the corrugated expansion box is easy to expand and contract, more alcohol overflows into the annular glass tube from the expansion box, the annular glass tube and the alcohol column can be made thicker, so that an observer can see the length of the alcohol column at a far position, namely, the temperature value can be clearly seen, and the on-site inspection of a worker is facilitated, the expansion box is made of phosphor copper sheets, the thickness of the expansion box is 0.15 mm, the outer diameter of a large circle is 45-50 mm, the outer diameter of a small circle is 35-40 mm, a metal corrugated pipe is sleeved outside the hose to prevent the diameter of the hose from being enlarged under pressure, the fixed sheet support and the movable sheet support are made of aluminum alloy, the diameter of the ball 9 is 1.2 mm, and the function is to reduce the friction force generated when the connecting rod 13 moves in the sleeve 10.
14. The contact resistance of the bus joint mainly comes from the surface abnormality of the bus and the oxide layer, and if the contact resistance is 0.06 ohm and the current intensity in the bus is 100 amperes, the power generated by the contact resistance is P = I2R =100 × 100 × 0.06= 600W, which is enough to burn the bus bar joint, the contact resistance and the heating condition of the bus bar joint are not negligible, the oxide layer of the bus bar is thickened due to the high temperature generated by the contact resistance, the contact resistance is further increased, and vicious circle is caused, which is a common phenomenon in a power distribution room and is also a headache problem of electricians.
15. Because the temperature is generally higher when the bus joint is abnormal, the sensor needs to be lifted up through the supporting foot 39, the bottom edge of the frame-shaped support 34 is 3-4 cm away from the top edge of the bus to prevent the sensor from being burnt out by high temperature, the temperature difference caused by the temperature difference is lower than the temperature monitored by the sensor, the temperature difference between the two is measured through a standard thermometer, and the offset is set in software of the computer 57 to display the correct value of the heating temperature of the bus joint on the display 58.
16. The higher measurement accuracy means that this sensor compares with the precision of artifical range estimation, can alleviate staff intensity of labour means reducible electrician in the time of patrolling and examining of electricity distribution room.
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| JPS5888629A (en) * | 1981-11-24 | 1983-05-26 | Aisan Ind Co Ltd | Thermowax |
| US6205861B1 (en) * | 1999-01-22 | 2001-03-27 | Setra Systems, Inc. | Transducer having temperature compensation |
| US7810993B2 (en) * | 2007-02-06 | 2010-10-12 | Chevron U.S.A. Inc. | Temperature sensor having a rotational response to the environment |
| US20090147824A1 (en) * | 2007-12-07 | 2009-06-11 | Wt Systems, Llc | Wireless remote passive temperature sensor for monitoring food |
| US8136988B2 (en) * | 2009-01-15 | 2012-03-20 | The Boeing Company | Methods and systems for passive, wireless temperature monitoring |
| US8480302B2 (en) * | 2010-09-28 | 2013-07-09 | International Business Machines Corporation | Micro-electro-mechanical-system temperature sensor |
| CN203824662U (en) * | 2014-05-15 | 2014-09-10 | 谭家钰 | Temperature sensor |
| CN204202774U (en) * | 2014-12-02 | 2015-03-11 | 重庆斯凯力科技有限公司 | Capacitive temperature sensor |
| CN207231642U (en) * | 2017-09-26 | 2018-04-13 | 东北林业大学 | A kind of explicit thermometer of new thermal expansion coefficients |
| CN109855761B (en) * | 2018-12-18 | 2020-08-14 | 盐城师范学院 | Heating monitoring sensor for electric power low-voltage distribution bus joint |
| CN110763357A (en) * | 2019-11-08 | 2020-02-07 | 江苏科技大学 | Capacitive temperature sensor and use method |
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