CN112595628B - Oilless anti-seismic remote sulfur hexafluoride gas density monitor - Google Patents
Oilless anti-seismic remote sulfur hexafluoride gas density monitor Download PDFInfo
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- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 77
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 66
- 230000007246 mechanism Effects 0.000 claims abstract description 87
- 238000006073 displacement reaction Methods 0.000 claims abstract description 49
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 12
- 230000035939 shock Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
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- 230000001105 regulatory effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 101000635799 Homo sapiens Run domain Beclin-1-interacting and cysteine-rich domain-containing protein Proteins 0.000 description 2
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- 238000009863 impact test Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- 238000005065 mining Methods 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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Abstract
The invention relates to the field of gas density monitoring and discloses an oilless anti-vibration remote sulfur hexafluoride gas density monitor which comprises a shell, a base, a Bardon tube, a locking contact signal shockproof mechanism, a bimetal element, a signal generator, a displacement amplifying mechanism and a density monitoring mechanism. When the density value changes, the barden tube and the bimetal element generate displacement, and the displacement is transmitted to the signal generator through the displacement amplifying mechanism, so that the signal generator sends out corresponding signals to complete the function of the density monitor, thereby overcoming the problem of low precision in the prior art and ensuring the advantages of high precision, good electrical performance, good contact point contact, long service life and the like of the density monitor.
Description
Technical Field
The invention relates to the field of gas density monitoring, in particular to an oilless anti-seismic remote sulfur hexafluoride gas density monitor.
Background
Sulfur hexafluoride electrical products are widely applied to the electric power departments and industrial and mining enterprises, and the rapid development of the electric power industry is promoted. Ensuring reliable and safe operation of sulfur hexafluoride electrical products has become one of the important tasks of the power sector. The arc extinguishing medium and the insulating medium of the sulfur hexafluoride electrical product are sulfur hexafluoride gas, so that air leakage cannot occur, and if the air leakage occurs, the reliable and safe operation of the sulfur hexafluoride electrical product cannot be ensured. It is necessary to monitor the sulfur hexafluoride density value of sulfur hexafluoride electrical products.
Currently, a mechanical pointer sulfur hexafluoride gas density monitor (fig. 1) is commonly used for monitoring sulfur hexafluoride gas density, i.e. the monitor can alarm and lock when sulfur hexafluoride electrical products leak, and can display on-site density values. The density monitor generally employs a dial 1, a pointer 2, a single barton tube 3, a single bimetal element 4, a base 5, a movement 6 and a hairspring type magnetically assisted electrical contact 7. When the contact (alarm or lock) is closed, the closing force is only a small force by the contact hairspring, and even if a magnetic force is applied, the force is small, so that the contact is extremely shock-proof and the contact is not firm enough. And above all, when oxidized or contaminated, poor contact of the electrical contacts 7 often occurs, with serious consequences. In addition, the magnetic-assisted electric contact has the advantages of low breaking speed, small contact capacity and short service life. Therefore, the density monitor is difficult to ensure the electrical performance and the service life, and once the problem occurs, a user only needs to replace the density monitor again, so that the economic loss is caused, and the requirements cannot be well met. Also most importantly, the mechanical SF6 gas density monitor currently used to monitor SF6 gas density monitors SF6 gas density, also suffer from the following significant drawbacks: 1) When SF6 electrical products leak, an alarm signal is sent only when the gas pressure of the SF6 electrical products drops to an alarm value, and the SF6 gas leaks a lot. For example, SF6 electrical equipment rated at 0.6MPa generally employs a density monitor with an alarm pressure of 0.52MPa and a locking pressure of 0.50 MPa. Many substations are unmanned substations, so that for the SF6 electrical equipment, if air leakage occurs, when the gas drops from the rated pressure of 0.6Mpa to the alarm pressure of 0.52Mpa, an operator on duty only finds the gas and notifies an maintainer to treat the leakage accident on site, and the SF6 gas is leaked a lot. Therefore, on-line monitoring of the density of SF6 electrical equipment is very needed in an unattended transformer station, and timely discovery of gas leakage of the SF6 electrical equipment is needed. 2) The density monitor contacts typically employ a hairspring-type magnetically assisted electrical contact. When the contact is closed, the closing force is small, and the contact is not firm enough. And most importantly, when oxidized or polluted, poor contact of the electric contact often occurs, so that failure is caused, and serious consequences are caused. In addition, the electrical equipment circuit breaker needs to have a reclosing function, so that the anti-seismic performance of the density monitor is good. If the circuit breaker is not good, vibration caused by the operation of the circuit breaker can cause misoperation of a locking contact of the density monitor, so that the circuit breaker cannot complete reclosing.
Disclosure of Invention
The invention aims to provide an oilless anti-vibration remote sulfur hexafluoride gas density monitor which has the advantages of high precision, good electrical performance, reliable contact, good anti-vibration performance, no oil leakage and density remote transmission.
In order to achieve the above purpose, the invention provides an oilless anti-vibration remote sulfur hexafluoride gas density monitor, which comprises a shell, wherein the outer side of the shell is provided with a connector communicated with the shell, and the inside of the shell is also provided with a pointer and a dial for indicating a density value;
the base is arranged in the shell;
the bimetal element is arranged in the shell;
one end of the Bardon tube is fixedly connected to the base, the other end of the Bardon tube is connected with one end of the bimetal element through an end seat, and the Bardon tube is communicated with the joint through a conduit;
the signal generator is arranged on the base and provided with a contact operating handle;
the displacement amplifying mechanism is a sector curved surface transmission mechanism, the starting end of the displacement amplifying mechanism is in transmission connection with the other end of the bimetal element, the amplifying end drives a contact operating handle to enable a contact on the signal generator to be connected or disconnected, and an alarm and locking contact signal is output;
the signal adjusting mechanism is arranged in the shell, and when the displacement amplifying mechanism rotates, the signal adjusting mechanism is driven to rotate so as to trigger the contact of the signal generator to be switched off or on;
the locking contact shockproof mechanism is arranged in the shell and close to the starting end of the displacement amplifying mechanism and used for limiting the movement of the displacement amplifying mechanism to be too large, and when an alarm point signal acts, the starting end of the displacement amplifying mechanism and the locking contact shockproof mechanism are in contact with each other;
the density monitoring mechanism is arranged in the shell and used for controlling and monitoring the density of the sulfur hexafluoride gas and converting the density value into a current signal for remote transmission.
Preferably, the displacement amplifying mechanism comprises a central shaft in transmission connection with a rotating shaft of the pointer, two clamping plates which are parallel and are arranged on the base at intervals, a sector gear which is rotationally connected between the two clamping plates, and a central gear which is meshed with the sector gear and is fixedly connected with the central shaft, the signal adjusting mechanism is arranged on the side surface of the central shaft opposite to the contact operating handle, and the radius of the sector gear is one third of that of the central gear.
Preferably, the non-gear side of the sector gear is provided with a rotating arm, one end of the rotating arm away from the sector gear is a starting end, the starting end is provided with a connecting rod, one end of the connecting rod away from the starting end is provided with a connecting arm, and one end of the connecting arm away from the connecting rod is connected with the other end of the bimetal element.
Preferably, the locking contact shockproof mechanism comprises a fixed seat arranged in the shell and an elastic element arranged on the fixed seat, and the elastic element is arranged corresponding to the starting end of the transmission arm.
Preferably, the fixing seat is provided with a guide rail, the elastic element is provided with a waist hole, and the elastic element is fixed on the guide rail through a screw penetrating through the waist hole.
Preferably, the density monitoring mechanism comprises a pressure sensor, a temperature sensor, an amplifying circuit, an analog-digital converter, an embedded computer, a power module, an RS485 communication module, a digital-analog converter, a voltage-current converter, a current constant current device and a control module;
the gas density monitor collects pressure and temperature signals through the pressure sensor and the temperature sensor, transmits the pressure and temperature signals to the analog-digital converter through the processing of the amplifying circuit, converts the pressure and temperature signals into a gas density value through the processing of the embedded computer software, and realizes remote transmission of the sulfur hexafluoride gas density value through the RS485 communication module so as to realize on-line monitoring of the gas density of sulfur hexafluoride gas electrical equipment; and after the gas density value is processed by the digital-analog converter, the voltage-current converter and the current constant current device, the sulfur hexafluoride gas density value is converted into a current signal, so that remote transmission is realized, and further, the gas density of the sulfur hexafluoride gas electrical equipment is monitored on line.
Preferably, the density monitoring mechanism further comprises a magnetic latching relay, an arcing indicator and a pressure anomaly indicator;
when the gas density value obtained by the embedded computer exceeds a preset pressure abnormality threshold value, the embedded computer drives the magnetic latching relay to act through the control module, so that the pressure abnormality indicator acts to send out pressure abnormality information; when the gas density value obtained by the embedded computer exceeds the preset arc burning pressure threshold, the embedded computer drives the magnetic latching relay to act through the control module, so that the arc burning indicator acts to send out arc burning information.
Preferably, the density monitoring mechanism further comprises a humidity sensor and a moisture expeller;
the gas density monitor collects humidity signals through the humidity sensor, the humidity signals are processed through the amplifying circuit and transmitted to the analog-digital converter, and then the signals are processed through the embedded computer, when the humidity signal value obtained by the embedded computer exceeds the preset humidity ultrahigh threshold value, the embedded computer drives the magnetic latching relay to act through the control module, so that the moisture expeller acts; when the humidity signal value is lower than the preset humidity drop preset threshold, the embedded computer closes the action of the magnetic latching relay through the control module, so that the moisture expeller stops working.
Preferably, the pressure sensor, the temperature sensor, the amplifying circuit, the analog-digital converter, the embedded computer, the power module, the RS485 communication module and the digital-analog converter are respectively in an independent grounding mode.
Preferably, the pressure abnormality indicator is an indicator light, an audible and visual alarm or an alarm horn.
Through the technical scheme, compared with the prior art, the novel plastic composite material has the following obvious advantages and characteristics:
the displacement amplifying mechanism controls the signal generator according to the gas density value, so that the signal generator sends out corresponding signals to complete the function of the density monitor, thereby overcoming the problem of low precision in the prior art, ensuring the advantages of high precision, good electrical performance, good contact point contact, long service life and the like of the density monitor, ensuring the reliable operation of the system, and being a sulfur hexafluoride gas density monitor with excellent performance, high precision and good performance, and being well applied to sulfur hexafluoride electrical equipment. Meanwhile, a pressure sensor and a temperature sensor are adopted, pressure and temperature signals are acquired through the pressure sensor and the temperature sensor, the pressure and temperature signals are processed and converted into density values through an embedded computer, and after being processed through an analog-digital converter, a voltage-current converter and a current constant current device, the density values of sulfur hexafluoride gas can be converted into current signals, so that long-distance transmission is realized, and further, the density of sulfur hexafluoride gas electrical equipment is monitored online; and the sulfur hexafluoride gas density value can be processed and converted into a gas density value through embedded computer software, and remote transmission of the sulfur hexafluoride gas density value is realized through the RS485 communication module, so that the gas density of the sulfur hexafluoride gas electrical equipment is monitored on line. When the gas density monitored by the density monitor reaches the alarm contact signal action, the displacement amplifying mechanism is contacted with the locking contact shockproof mechanism, so that the shock resistance of the locking contact of the density monitor is improved, the locking contact of the density monitor cannot be caused to malfunction due to shock caused by the operation of the circuit breaker, and the circuit breaker can be reclosed.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art pointer sulfur hexafluoride gas density monitor;
FIG. 2 shows a schematic structural diagram of an oil-free anti-seismic remote sulfur hexafluoride gas density monitor of the invention;
FIG. 3 shows a side view of FIG. 2 of the present invention;
FIG. 4 shows a schematic diagram of the connection of the displacement amplifying mechanism and the locking contact shockproof mechanism of the oil-free shock-resistant remote sulfur hexafluoride gas density monitor;
FIG. 5 is a schematic view showing the connection between the elastic member and the fixing base of the locking contact shock-proof mechanism of the present invention
Fig. 6 shows a schematic diagram of a density monitoring mechanism of the oil-free anti-seismic remote sulfur hexafluoride gas density monitor.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Referring to fig. 2-6, the present embodiment discloses an oil-free anti-vibration remote sulfur hexafluoride gas density monitor, which comprises a housing 1, a base 2, a bimetal element 3, a barden tube 4, an end seat 5, a signal generator 6, a contact operating handle 61, a displacement amplifying mechanism 7, a signal adjusting mechanism 8, a pointer 102 and a dial 103 for indicating a density value, a locking contact shockproof mechanism 9 and a density monitoring mechanism 10 arranged on the side surface of the housing 1. The outside of the housing 1 is provided with a connector 101 which is communicated with the connector 101, the connector 101 is communicated with the barden tube 4 through a conduit, one end of the barden tube 4 is fixedly connected to the base 2, the other end of the barden tube 4 is connected with one end of the bimetal element 3 through an end seat 5, the signal generator 6 is arranged on the base 2 and is provided with a contact operating handle 61, specifically, in the embodiment, the signal generator 6 is a micro switch and is provided with three micro switches 601, 602 and 603 respectively, the three micro switches 601, 602 and 603 respectively correspond to an alarm contact, a separation locking contact and a closing locking contact, the contact operating handle 61 is correspondingly provided with three contacts 611, 612 and 613 respectively, and the signal regulating mechanism 8 is also provided with three contacts 81, 82 and 83 respectively. The signal adjusting mechanisms 81, 82, 83 drive the contact operating handles 611, 612, 613 according to the gas density value and the pressure value to turn on or off the contacts on the micro-switches 601, 602, 603. The contacts of the microswitch 6 are connected by wires to a wire holder fixed to the housing 1. The outer side of the shell 1 is also provided with a surface glass 30 and a sealing ring correspondingly arranged, so that the internal structure of the shell 1 can be protected from mechanical damage, dirt and rainwater. The micro switch is also provided with a switch reinforcing mechanism, so that when the switch is subjected to switching-on/off to generate strong vibration, the micro switch shell can be prevented from being broken, and the micro switch contact operating handle 61 is prevented from falling off, thereby greatly improving the vibration resistance of the monitor and ensuring the reliable operation of the system.
The displacement amplifying mechanism 7 is a sector curved surface transmission mechanism, the starting end of the displacement amplifying mechanism is in transmission connection with the other end of the bimetal element 3, the amplifying end drives the contact operating handle 61 to enable the contact on the signal generator 6 to be connected or disconnected, an alarm and locking contact signal is output, and the displacement amplifying mechanism 7 drives the signal adjusting mechanism 8 to rotate when rotating so as to trigger the contact of the signal generator 6 to be disconnected or connected.
Referring to fig. 2 and 3, specifically, the displacement amplifying mechanism 7 includes a central shaft 71 in driving connection with a rotation shaft 1021 of the pointer 102, two clamping plates 72 parallel to and spaced apart from each other on the base 2, a sector gear 73 rotatably connected between the two clamping plates 72, and a central gear 74 meshed with the sector gear 73 and fixedly connected to the central shaft 71, the signal adjusting mechanism 8 is disposed on a side surface of the central shaft 71 opposite to the contact operating handle 61, and a radius of the sector gear 73 is one third of a radius of the central gear 74. The non-gear side of the sector gear 73 is provided with a rotating arm 731, one end of the rotating arm 731, which is far away from the sector gear 73, is a starting end, the starting end is provided with a connecting rod 11, one end of the connecting rod 11, which is far away from the starting end, is provided with a connecting arm 12, and one end of the connecting arm 12, which is far away from the connecting rod 11, is connected with the other end of the bimetal element 3. Specifically, the signal adjusting mechanism 8 is three eccentric gears mounted on the center shaft 71 at intervals, and since the radius of the sector gear 71 is three times smaller than that of the center gear 74, a displacement amplifying effect can be exerted. In the sulfur hexafluoride gas density monitor of the embodiment, the signal generator 6 adopts the micro switch, and the control of the micro switch contact points is all controlled by the displacement amplifying mechanism 7 after the amplification, and the displacement amplifying mechanism 7 is utilized to amplify the displacement, so that the purpose of improving the precision is achieved, and the effect of high precision is achieved.
Referring to fig. 4, the locking contact shockproof mechanism 9 is disposed in the housing 1 near the start end of the displacement amplifying mechanism 7, for limiting the displacement amplifying mechanism 7 from moving too much, and when the alarm point signal acts, the start end of the displacement amplifying mechanism 7 and the locking contact shockproof mechanism 9 are in contact with each other. Specifically, the locking contact shock-proof mechanism 9 includes a fixed seat 91 disposed in the housing 1, and an elastic element 92 disposed on the fixed seat 91, where the elastic element 92 is disposed corresponding to the start end of the transmission arm 731. Referring to fig. 5, a guide rail 911 is provided on the fixing seat 91, a waist hole 921 is provided on the elastic element 92, and the elastic element 92 is fixed on the guide rail 911 through the waist hole 921 by a screw 93. Preferably, the elastic element 92 is L-shaped and may be made of manganese steel sheet or phosphor copper sheet. When the density of the gas monitored by the density monitor reaches the alarm contact signal, the transmission arm 731 and the elastic member 92 are contacted with each other.
When SF is 6 Vibration caused by the operation of the circuit breaker is transmitted to the density monitor, and the vibration can cause the baron pipe 4 and the bimetal element 3 of the density monitor to generate displacement and be transmitted to the transmission arm through the connecting rod 11731 causes the actuator arm 731 to oscillate back and forth, and when the actuator arm 731 oscillates beyond the position corresponding to the action of the alarm contact of the gas density monitor, the elastic element 92 contacts the start end of the actuator arm 731 to prevent the actuator arm 731 from moving in the direction corresponding to the action of the lock contact of the gas density monitor, thereby greatly improving the shock resistance of the lock contact of the density monitor and enabling SF to be achieved 6 Vibration caused by the operation of the circuit breaker is not easy to cause misoperation of a locking contact of the density monitor, so that the circuit breaker can complete a reclosing function, and the complete performance of power supply is ensured. Because the locking contact signal shockproof mechanism 9 mainly comprises the elastic element 92 and the fixing seat 91, the structure cost is low, the structure is very simple, the simpler and more reliable are, the production is very facilitated, and the shockproof effect is very good.
Through comparison test, for example, for a density monitor with rated parameters of 0.6MPa, alarm pressure of 0.53MPa and locking pressure of 0.50MPa, when the inflation pressure of the density monitor is 0.57MPa, in an impact test with an impact amplitude of 50g and a duration of 11ms, the locking joint (0.50 MPa) of the density monitor can malfunction, and the reclosing requirement of the circuit breaker is difficult to meet. In the same density monitor, if the locking contact signal shockproof mechanism 9 is added, namely, for the density monitor with rated parameters of 0.6MPa, alarm pressure of 0.53MPa and locking pressure of 0.50MPa, when the inflation pressure of the density monitor is reduced to 0.53MPa, in an impact test with the impact amplitude of 50g and the duration of 11ms, the locking contact (0.50 MPa) of the density monitor cannot malfunction, so that the reclosing requirement of the circuit breaker can be met. Therefore, the locking contact signal shockproof mechanism 9 is added, so that the shock resistance is greatly improved, the cost is good, the production is facilitated, and the large-scale popularization is facilitated. Meanwhile, oil filling is not needed, the problem of oil leakage is avoided, and the method has important significance. In order to further improve the anti-seismic performance of the density monitor, a vibration-proof pad is arranged on the shell 1. The influence of temperature difference problem is solved, and the surface parcel of casing 1 has the heat preservation.
When the gas density value changes, the baron tube 4 and the bimetal element 3 generate displacement, the displacement is transmitted to the starting end of the displacement amplifying mechanism 7 through the connecting rod 11, the amplifying end (central shaft 71) of the displacement amplifying mechanism 7 is connected with the contact operating handles 611, 612 and 613 of the micro switches 601, 602 and 603 through the signal adjusting mechanisms 81, 82 and 83, the contact operating handles 611, 612 and 61 are driven according to the gas density value and the pressure value, the contacts on the micro switches 601, 602 and 603 are connected or disconnected, and the micro switches send corresponding signals, so that the function of the density monitor is completed.
The sulfur hexafluoride gas density monitor is based on a Bardon tube 4, and utilizes a bimetal element 3 to correct the changed pressure and temperature, so as to reflect the change of the sulfur hexafluoride gas density. Under the pressure of sulfur hexafluoride gas as medium to be measured, the density value of sulfur hexafluoride gas is changed and the pressure value is correspondingly changed by the action of the bimetal element 3, so that the tail end of the Bardon tube 4 is forced to generate corresponding elastic deformation-displacement, the displacement is transmitted to the central shaft 71 of the displacement amplifying mechanism 7 by means of the bimetal element 3 and the connecting rod 11, the central shaft 71 is transmitted to the pointer 102, and the measured sulfur hexafluoride gas density value is indicated on the dial 103. If the density value of the air leakage is reduced to a certain degree (reaches an alarm or locking value), the Bardon tube 4 generates corresponding downward displacement, the connecting arm 12 is downwards displaced through the bimetal element 3 and is transmitted to the connecting rod 11, the connecting rod 11 is transmitted to the displacement amplifying mechanism 7, the sector gear 73 is transmitted to the central shaft 71 and is amplified, the central shaft 71 drives the corresponding signal regulating mechanisms 81, 82 and 83 to rotate, to a certain degree, the signal regulating mechanisms 81, 82 and 83 trigger the contact operating handles 611, 612 and 613 of the corresponding micro switches 601, 602 and 603, the contacts of the corresponding micro switches 601, 602 and 603 are connected, corresponding signals (alarm or locking) are sent, and the density of sulfur hexafluoride gas in the electric switches and other equipment is monitored and controlled, so that the electric equipment can safely work. If the density value is increased, the pressure value is correspondingly increased to a certain extent, the barden tube 4 also generates corresponding upward displacement, the connecting arm 12 is upwards displaced by the bimetal element 3 and is transmitted to the connecting rod 11, the connecting rod 11 is transmitted to the displacement amplifying mechanism 7, the sector gear 73 is transmitted to the central shaft 71, the signal adjusting mechanisms 81, 82 and 83 rotate, and to a certain extent, the signal adjusting mechanisms 81, 82 and 83 do not trigger the contact operating handles 611, 612 and 613 of the corresponding micro switches 601, 602 and 603, the contacts of the corresponding micro switches 601, 602 and 603 are opened, and the signal (alarm or locking) is released.
The density monitoring mechanism 10 is disposed inside the housing 1, and is used for controlling and monitoring the density of sulfur hexafluoride gas, and converting the density value into a current signal for remote transmission.
The density monitoring mechanism 10 includes a pressure sensor 13, a temperature sensor 14, an amplifying circuit 15, an analog-to-digital converter 16, an embedded computer 17, a power module 18, an RS485 communication module 19, a digital-to-analog converter 20, a voltage-to-current converter 21, a current constant current device 22, a control module 23, a magnetic latching relay 24, an arcing indicator 25, a pressure abnormality indicator 26, a humidity sensor 27, and a moisture expeller 28.
The temperature sensor 14 is fixed on the right side surface of the base 2 in a sealing way, and the temperature sensor 14 is in contact with sulfur hexafluoride gas, so that the temperature value of the sulfur hexafluoride gas can be accurately measured. The pressure sensor 13 is fixed on the back of the base 2 in a sealing way, the amplifying circuit 15, the embedded computer 17, the power module 18, the analog-digital converter 16, the RS485 communication module 19, the digital-analog converter 20, the voltage-current converter 21 and the current constant current device 22 are all fixed on the printed board 31, the printed board 31 is positioned on the back of the base 2, and on the back of the shell 1, the amplifying circuit 15, the embedded computer 17, the power module 18, the analog-digital converter 16, the voltage-current converter 21 and the current constant current device 22 are positioned on the periphery of the pressure sensor 13, and the moisture expeller 28 is arranged on the lower part outside the shell 1.
The gas density monitor collects pressure and temperature signals through the pressure sensor 13 and the temperature sensor 14, processes the signals through the amplifying circuit 15, transmits the signals to the analog-digital converter 16, processes the signals through the embedded computer 17 software and converts the signals into gas density values, and realizes remote transmission of the sulfur hexafluoride gas density values through the RS485 communication module 19, so that the gas density of the sulfur hexafluoride gas electrical equipment is monitored online; and after the gas density value is processed by the digital-analog converter 20, the voltage-current converter 21 and the current constant current device 22, the sulfur hexafluoride gas density value is converted into a current signal, so that the remote transmission is realized, and the gas density of the sulfur hexafluoride gas electrical equipment is monitored on line.
When the gas density value obtained by the embedded computer 17 exceeds the preset pressure abnormality threshold value, the embedded computer 17 drives the magnetic latching relay 24 to act through the control module 23, so that the pressure abnormality indicator 26 acts to send out pressure abnormality information; when the gas density value obtained by the embedded computer 17 exceeds the preset arc burning pressure threshold value, the embedded computer 17 drives the magnetic latching relay 24 to act through the control module 23, so that the arc burning indicator 25 acts to send out arc burning information.
The gas density monitor collects humidity signals through the humidity sensor 27, the humidity signals are processed through the amplifying circuit 15 and transmitted to the analog-digital converter 16, and then the signals are processed through the embedded computer 17, when the humidity signal value obtained by the embedded computer 17 exceeds the preset humidity ultrahigh preset threshold value, the embedded computer 17 drives the magnetic latching relay 24 to act through the control module 23, so that the moisture expeller 28 acts; when the humidity signal value is lower than the preset humidity drop preset threshold value, the embedded computer 17 closes the magnetic latching relay 24 through the control module 23 to act, so that the moisture expeller 28 stops working.
The working principle or steps are as follows: the pressure and temperature are measured by the pressure sensor 13 and the temperature sensor 14, the signals of the measured pressure and temperature are amplified by the amplifying circuit 15, the amplified signals of the pressure and the temperature are processed by the digital-analog converter 20, the pressure and the temperature values are converted into corresponding digital signals of the pressure and the temperature, and the digital signals are acquired by the embedded computer 17 and are internally calculated by the embedded computer 17 to obtain the sulfur hexafluoride gas density P 20 Density P of sulfur hexafluoride gas 20 P converted into a voltage signal by conversion of the analog-to-digital converter 16 20U Then the voltage signal P is converted by the voltage-current converter 21 20U P converted into a current signal 20I Then the sulfur hexafluoride gas density P of the current signal is caused by the action of the current constant current device 22 20I The sulfur hexafluoride gas electric equipment density monitoring system can realize remote transmission and further realize on-line monitoring of the density of the sulfur hexafluoride gas electric equipment. And can also be converted into a gas density value P through the software processing of the embedded computer 17 20 Then the sulfur hexafluoride gas density value P is transmitted through the RS485 communication module 19 20 Realize long-distance transmission and further realize on-line monitoring of gas density P of sulfur hexafluoride gas electrical equipment 20 。
In addition, the gas density value P obtained by the embedded computer 17 20 When the preset pressure abnormality preset threshold value PYC is exceeded, the embedded computer 17 drives the magnetic latching relay 24 to act through the control module 23, so that the pressure abnormality indicator 26 acts to send out pressure abnormality information, and the pressure abnormality indicator 26 can be a red indicator lamp, an audible and visual alarm or an alarm horn. When the pressure is abnormal, the staff is reminded in time that the obstacle is present, and corresponding measures are needed to be taken, such as reminding the staff that the staff is not suitable to approach the equipment with the problem. When the embedded computer 17 obtains the gas density value P 20 When the preset arc pressure preset threshold PRH is exceeded, the embedded computer 17 drives the magnetic latching relay 24 to act through the control module 23, so that the arc burning indicator 25 acts to send out arc burning information, and a worker knows that the electric equipment is in arc burning, and the electric equipment needs to be processed and maintained in time.
The gas density monitor collects humidity signals through the humidity sensor 27, the humidity signals are processed through the amplifying circuit 15 and transmitted to the analog-digital converter 16, and then the signals are processed through the embedded computer 17, when the humidity signal value PH obtained by the embedded computer 17 exceeds the preset humidity ultrahigh preset threshold PHG, the embedded computer 17 drives the magnetic latching relay 24 to act through the control module 23, so that the moisture expeller 28 acts, the humidity of the density monitor is reduced, and the insulation performance of the density monitor is ensured; when the humidity signal PH is lower than the preset humidity drop preset threshold PHX, the embedded computer 17 closes the magnetic latching relay 24 through the control module 23 to stop the operation of the moisture expeller 28.
In addition, in order to improve the anti-electromagnetic interference capability of the density monitor, as shown in fig. 6, the pressure sensor 13, the temperature sensor 14, the humidity sensor 27, the amplifying circuit 15, the analog-digital converter 16, the embedded computer 17, the power module 24, the RS485 communication module 33 and the digital-analog converter 20 are respectively grounded in an independent manner, so that currents in the loops are led into the ground after the loops are grounded, electromagnetic interference is avoided, the anti-electromagnetic interference capability of the density monitor is improved, and reliable operation of the density monitor is ensured.
In summary, the sulfur hexafluoride gas density monitor of the embodiment greatly improves the accuracy of the density monitor due to the fact that the displacement amplifying mechanism 7 is adopted to amplify the displacement. Meanwhile, pressure signals and temperature signals are acquired by the pressure sensor 13 and the temperature sensor 14 and are processed and converted into density values by the embedded computer 17, and after being processed by the analog-digital converter 16, the voltage-current converter 21 and the current constant current device 22, the sulfur hexafluoride gas density values can be converted into current signals (4-20 mA), so that remote transmission is realized, and further, the density of sulfur hexafluoride gas electrical equipment is monitored online. In addition, the density monitor adopts the micro switch as the signal generator 6, and the control of the micro switch contact points is all controlled by the displacement amplifying mechanism 7 after the amplification, so that the precision is improved, the effect of high precision is achieved, and the density monitor has the advantages of high precision, good contact point electrical property, long service life and more accurate temperature compensation property.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention. In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (4)
1. An oilless shock resistant remote sulfur hexafluoride gas density monitor, comprising:
the device comprises a shell (1), wherein a joint (101) communicated with the shell (1) is arranged on the outer side of the shell, and a pointer (102) and a dial (103) for indicating a density value are also arranged in the shell;
a base (2), wherein the base (2) is arranged inside the shell (1);
a bimetal element (3), wherein the bimetal element (3) is arranged inside the shell (1);
one end of the Bardon tube (4) is fixedly connected to the base (2), the other end of the Bardon tube is connected with one end of the bimetal element (3) through an end seat (5), and the Bardon tube (4) is communicated with the joint (101) through a conduit;
a signal generator (6), wherein the signal generator (6) is arranged on the base (2) and is provided with a contact operating handle (61);
the displacement amplifying mechanism (7), the displacement amplifying mechanism (7) is a sector curved surface transmission mechanism, the initial end of the displacement amplifying mechanism is in transmission connection with the other end of the bimetal element (3), the amplifying end drives the contact operating handle (61) to enable the contact on the signal generator (6) to be connected or disconnected, and an alarm and locking contact signal is output;
the signal adjusting mechanism (8), the signal adjusting mechanism (8) is arranged in the shell (1), and when the displacement amplifying mechanism (7) rotates, the signal adjusting mechanism (8) is driven to rotate so as to trigger the contact of the signal generator (6) to be switched off or on;
the locking contact shockproof mechanism (9) is arranged in the shell (1) and close to the starting end of the displacement amplifying mechanism (7) and used for limiting the excessive movement of the displacement amplifying mechanism (7), and when an alarm point signal acts, the starting end of the displacement amplifying mechanism (7) is in contact with the locking contact shockproof mechanism (9);
the density monitoring mechanism (10) is arranged in the shell (1) and is used for controlling and monitoring the density of the sulfur hexafluoride gas and converting the density value into a current signal for remote transmission;
the displacement amplifying mechanism (7) comprises a central shaft (71) in transmission connection with a rotating shaft (1021) of the pointer (102), two clamping plates (72) which are arranged on the base (2) in parallel at intervals, a sector gear (73) which is connected between the two clamping plates (72) in a rotating mode, and a central gear (74) which is meshed with the sector gear (73) and fixedly connected with the central shaft (71), wherein the signal adjusting mechanism (8) is arranged on the side face of the central shaft (71) and opposite to the contact operating handle (61), and the radius of the sector gear (73) is one third of the radius of the central gear (74);
a rotating arm (731) is arranged on the non-gear side of the sector gear (73), one end of the rotating arm (731) away from the sector gear (73) is a starting end, a connecting rod (11) is arranged at the starting end, a connecting arm (12) is arranged at one end of the connecting rod (11) away from the starting end, and one end of the connecting arm (12) away from the connecting rod (11) is connected with the other end of the bimetal element (3);
the locking contact shockproof mechanism (9) comprises a fixed seat (91) arranged in the shell (1) and an elastic element (92) arranged on the fixed seat (91), wherein the elastic element (92) is arranged corresponding to the starting end of the rotating arm (731).
2. The oilless vibration-resistant remote sulfur hexafluoride gas density monitor as defined in claim 1, wherein a guide rail (911) is provided on the fixing base (91), a waist hole (921) is provided on the elastic element (92), and the elastic element (92) is fixed on the guide rail (911) through the screw (93) passing through the waist hole (921).
3. The oil-free anti-vibration remote sulfur hexafluoride gas density monitor according to claim 1, wherein the density monitoring mechanism (10) comprises a pressure sensor (13), a temperature sensor (14), an amplifying circuit (15), an analog-digital converter (16), an embedded computer (17), a power supply module (18), an RS485 communication module (19), a digital-analog converter (20), a voltage-current converter (21), a current constant current device (22) and a control module (23);
the gas density monitor collects pressure and temperature signals through a pressure sensor (13) and a temperature sensor (14), processes the signals through an amplifying circuit (15), transmits the signals to an analog-digital converter (16), processes the signals through an embedded computer (17) software and converts the signals into gas density values, and realizes remote transmission of the sulfur hexafluoride gas density values through an RS485 communication module (19), so that the gas density of sulfur hexafluoride gas electrical equipment is monitored on line;
after the gas density value is processed by the digital-analog converter (20), the voltage-current converter (21) and the current constant current device (22), the sulfur hexafluoride gas density value is converted into a current signal, so that remote transmission is realized, and further, the gas density of the sulfur hexafluoride gas electrical equipment is monitored on line.
4. An oil-free anti-vibration remote sulfur hexafluoride gas density monitor according to claim 3, wherein the pressure sensor (13), the temperature sensor (14), the amplifying circuit (15), the analog-digital converter (16), the embedded computer (17), the power supply module (18), the RS485 communication module (19) and the digital-analog converter (20) are respectively grounded independently.
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Address after: No. 397, Tongcheng South Road, Baohe District, Hefei City, Anhui Province 230061 Patentee after: Super high voltage branch of State Grid Anhui Electric Power Co.,Ltd. Country or region after: China Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: SHANGHAI ROYE ELECTRIC Co.,Ltd. Address before: No.8, jincui Road, Shuangfeng Industrial Park, Fuyang North Road, Changfeng County, Hefei City, Anhui Province Patentee before: STATE GRID ANHUI POWER SUPPLY COMPANY OVERHAUL BRANCH Country or region before: China Patentee before: STATE GRID CORPORATION OF CHINA Patentee before: SHANGHAI ROYE ELECTRIC Co.,Ltd. |