CN112595628A - Oil-free anti-seismic remote transmission type sulfur hexafluoride gas density monitor - Google Patents
Oil-free anti-seismic remote transmission type sulfur hexafluoride gas density monitor Download PDFInfo
- Publication number
- CN112595628A CN112595628A CN202011323353.7A CN202011323353A CN112595628A CN 112595628 A CN112595628 A CN 112595628A CN 202011323353 A CN202011323353 A CN 202011323353A CN 112595628 A CN112595628 A CN 112595628A
- Authority
- CN
- China
- Prior art keywords
- gas density
- sulfur hexafluoride
- hexafluoride gas
- signal
- embedded computer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 80
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 70
- 230000005540 biological transmission Effects 0.000 title claims description 39
- 230000007246 mechanism Effects 0.000 claims abstract description 89
- 238000006073 displacement reaction Methods 0.000 claims abstract description 48
- 230000003321 amplification Effects 0.000 claims abstract description 26
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims abstract description 23
- 238000004891 communication Methods 0.000 claims description 12
- 230000035939 shock Effects 0.000 claims description 10
- 230000000007 visual effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000009863 impact test Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 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
- 230000005856 abnormality Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention relates to the field of gas density monitoring, and discloses an oil-free anti-seismic remote sulfur hexafluoride gas density monitor which comprises a shell, a base, a baton pipe, a locking contact signal anti-seismic mechanism, a bimetallic element, a signal generator, a displacement amplification mechanism and a density monitoring mechanism. When the density value changes, the bourdon tube and the bimetallic 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, 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 oil-free anti-seismic remote transmission type sulfur hexafluoride gas density monitor.
Background
Sulfur hexafluoride electrical products are widely applied to the electric power sector and industrial and mining enterprises, and rapid development of the electric power industry is promoted. Ensuring the 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 gas leakage cannot occur, and if gas leakage occurs, reliable and safe operation of the sulfur hexafluoride electrical product cannot be guaranteed. Therefore, it is necessary to monitor the density value of sulfur hexafluoride in sulfur hexafluoride electrical products.
At present, a mechanical pointer type sulfur hexafluoride gas density monitor (shown in figure 1) is generally adopted for monitoring the sulfur hexafluoride gas density, namely, the monitor can give an alarm and lock when the sulfur hexafluoride electrical product leaks gas, and can display the field density value. The density monitor generally employs a dial 1, a pointer 2, a single bourdon tube 3, a single or double metal element 4, a base 5, a movement 6 and a hairspring type magnetic auxiliary electric contact 7. When the contact (alarm or lock) is closed, the closing force is small only by the small force of the contact spring even if a magnetic force is applied, so that the contact is extremely afraid of vibration and the contact closing is not firm enough. And above all, when it is oxidized or contaminated, the phenomenon of poor contact of the electric contacts 7 often occurs, with serious consequences. In addition, the magnetic-assisted electric contact is low in breaking speed and small in contact capacity, so that the service life is short. Therefore, the density monitor is difficult to ensure the electrical performance and the service life, and once a problem occurs, a user only needs to replace the density monitor again, so that economic loss is caused, and the requirements cannot be well met. Most importantly, the mechanical SF6 gas density monitor currently used for monitoring SF6 gas density for monitoring SF6 gas density has the following outstanding drawbacks: 1) When an SF6 electrical product leaks, an alarm signal is sent out only when the gas pressure of the SF6 electrical product drops to an alarm value, and the SF6 gas leaks a lot. For example, SF6 electrical equipment with a rated pressure of 0.6MPa generally adopts a density monitor with an alarm pressure of 0.52MPa and a locking pressure of 0.50 MPa. At present, many substations are unattended substations, so for the SF6 electrical equipment, if gas leaks, when the gas is reduced from the rated pressure of 0.6Mpa to the alarm pressure of 0.52Mpa, a person on duty finds the gas, and then informs a maintainer to deal with the leakage accident on site, and at the moment, the SF6 gas leaks a lot. Therefore, in an unattended substation, the density of the SF6 electrical equipment needs to be monitored online, and gas leakage of the SF6 electrical equipment needs to be found in time. 2) The density monitor contacts typically employ hairspring-type magnetically assisted electrical contacts. When the contact is closed, the closing force is small, and the contact closing is not firm enough. And most importantly, when the cable is oxidized or polluted, the phenomenon of poor contact of the electric contact is often generated, so that the cable is out of work, and serious consequences are generated. In addition, the electrical equipment circuit breaker needs to have a reclosing function, so the shock resistance of the density monitor is good. If the circuit breaker is not good, the vibration caused by the operation of the circuit breaker can cause the locking contact of the density monitor to generate misoperation, so that the circuit breaker can not complete reclosing.
Disclosure of Invention
The invention aims to provide an oil-free anti-seismic remote transmission type sulfur hexafluoride gas density monitor which is high in precision, good in electrical performance, reliable in contact of contacts, good in anti-seismic performance, free of oil leakage and capable of achieving a density remote transmission function.
In order to achieve the aim, the invention provides an oil-free anti-seismic remote transmission type sulfur hexafluoride gas density monitor, which comprises a shell, wherein the outer side of the shell is provided with a joint communicated with the shell, and the interior of the shell is also provided with a pointer and a dial for indicating the density value;
the base is arranged inside the shell;
a bimetal element disposed inside the housing;
one end of the bourdon tube is fixedly connected to the base, the other end of the bourdon tube is connected with one end of the bimetallic element through the end seat, and the bourdon tube is communicated with the joint through a conduit;
the signal generator is arranged on the base and is provided with a contact operating handle;
the displacement amplification mechanism is a fan-shaped curved surface transmission mechanism, the starting end of the displacement amplification mechanism is in transmission connection with the other end of the bimetallic element, and the amplification end drives the contact operating handle to switch on or off a contact on the signal generator and output an alarm and locking contact signal;
the displacement amplifying mechanism drives the signal adjusting mechanism to rotate when rotating, so that the contact of the trigger signal generator is switched off or on;
the locking contact shockproof mechanism is arranged in the shell and close to the initial end of the displacement amplification mechanism and is used for limiting the displacement amplification mechanism to move too much, and when the alarm point signal acts, the initial end of the displacement amplification mechanism is contacted with the locking contact shockproof mechanism;
and 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 amplification mechanism includes the center pin of being connected with the pivot transmission of pointer, parallel and interval set up two splint on the base, rotate the sector gear of connecting between two splint and with sector gear intermeshing, and with center pin fixed connection's sun gear, signal conditioning mechanism set up in the side of center pin is relative with the contact operating handle, the radius of sector gear is the third of sun gear radius.
Preferably, a rotating arm is arranged on the non-gear side of the sector gear, one end, far away from the sector gear, of the rotating arm is a starting end, a connecting rod is arranged at the starting end, one end, far away from the starting end, of the connecting rod is provided with a connecting arm, and one end, far away from the connecting rod, of the connecting arm is connected with the other end of the bimetallic element.
Preferably, the locking contact shockproof mechanism comprises a fixed seat arranged in the housing 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 passes through the waist hole through a screw to be fixed on the guide rail.
Preferably, the density monitoring mechanism comprises a pressure sensor, a temperature sensor, an amplifying circuit, an analog-digital converter, an embedded computer, a power supply module, an RS485 communication module, a digital-analog converter, a voltage-current converter, a current galvanostat and a control module;
the gas density monitor acquires pressure and temperature signals through a pressure sensor and a temperature sensor, the pressure and temperature signals are processed through an amplifying circuit and transmitted to an analog-digital converter, the signals are processed through embedded computer software and converted into gas density values, the remote transmission of the sulfur hexafluoride gas density values is realized through an RS485 communication module, and then the gas density of sulfur hexafluoride gas electrical equipment is monitored on line; and the gas density value is processed by a digital-to-analog converter, a voltage-current converter and a current galvanostat, and then the sulfur hexafluoride gas density value is converted into a current signal to realize remote transmission, so that the gas density of 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 the preset pressure abnormity threshold value, the embedded computer drives the magnetic latching relay to act through the control module, so that the pressure abnormity indicator acts to send out pressure abnormity information; when the gas density value obtained by the embedded computer exceeds the preset arcing pressure threshold value, the embedded computer drives the magnetic latching relay to act through the control module, so that the arcing indicator acts to send out arcing information.
Preferably, the density monitoring mechanism further comprises a humidity sensor and a moisture expeller;
the gas density monitor acquires a humidity signal through a humidity sensor, the humidity signal is processed through an amplifying circuit and transmitted to an analog-digital converter, the humidity signal is processed through an embedded computer, and when the humidity signal value obtained by the embedded computer exceeds a preset humidity ultrahigh threshold value, the embedded computer drives a magnetic latching relay to act through a control module so as to enable a moisture dispeller to act; and when the humidity signal value is lower than the preset humidity drop threshold value, the embedded computer closes the action of the magnetic latching relay through the control module, so that the moisture dispeller 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 connected with the ground in an independent mode.
Preferably, the pressure abnormality indicator is an indicator lamp, an audible and visual alarm or an alarm horn.
Compared with the prior art, the technical scheme 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 a corresponding signal to complete the function of the density monitor, the problem of low precision in the prior art is solved, the advantages of high precision, good electrical performance, good contact, long service life and the like of the density monitor are ensured, the system is ensured to work reliably, and the sulfur hexafluoride gas density monitor is excellent in performance, high in precision and good in performance and can be 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, are processed and converted into density values through an embedded computer, and the density values of the sulfur hexafluoride gas can be converted into current signals after being processed through an analog-digital converter, a voltage-current converter and a current galvanostat, so that long-distance transmission is realized, and the density of sulfur hexafluoride gas electrical equipment can be monitored on line; and the sulfur hexafluoride gas density value can be processed and converted into a gas density value through embedded computer software, and the remote transmission of the sulfur hexafluoride gas density value is realized through an RS485 communication module, so that the gas density of sulfur hexafluoride gas electrical equipment can be monitored on line. When the gas density monitored by the density monitor reaches the action of the alarm contact signal, the displacement amplification mechanism is contacted with the locking contact shockproof mechanism, the shockproof performance of the locking contact of the density monitor is improved, the locking contact of the density monitor cannot be mistakenly operated due to the shock caused by the operation of the circuit breaker, and the circuit breaker can complete reclosing.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic diagram of a prior art pointer sulfur hexafluoride gas density monitor;
FIG. 2 shows a schematic diagram of the structure of an oil-free shock-resistant remote sulfur hexafluoride gas density monitor of the present invention;
FIG. 3 shows a side view of FIG. 2 of the present invention;
FIG. 4 shows a schematic diagram of the connection between the displacement amplification mechanism and the locking contact shockproof mechanism of the oilless shock-resistant remote sulfur hexafluoride gas density monitor of the present invention;
FIG. 5 is a schematic view showing the connection between the elastic member and the fixing base of the locking contact shockproof mechanism of the present invention
Fig. 6 shows a schematic structural diagram of a density monitoring mechanism of the oil-free shock-resistant remote sulfur hexafluoride gas density monitor.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Referring to fig. 2-6, the present embodiment discloses an oil-free shock-resistant remote sulfur hexafluoride gas density monitor, which includes a housing 1, a base 2 disposed inside the housing 1, a bimetal element 3, a bourdon 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 density values, a locking contact shock-proof mechanism 9, and a density monitoring mechanism 10 disposed on a side surface of the housing 1. The outer side of the housing 1 is provided with a connector 101 communicated with the housing, the connector 101 is communicated with a badon tube 4 through a conduit, one end of the badon tube 4 is fixedly connected to the base 2, the other end of the badon tube is connected with one end of the bimetallic 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, concretely, 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, an opening 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 adjusting 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, so that the contacts on the micro switches 601, 602, 603 are switched on or off. The contacts of the microswitch 6 are connected by wires to a wire holder which is fixed to the housing 1. The outer side of the shell 1 is also provided with a watch 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 switched on and off to generate strong vibration, the shell of the micro switch can be prevented from being broken, and the contact operating handle 61 of the micro switch can be prevented from falling off, therefore, the vibration resistance of the monitor can be greatly improved, and the reliable work of the system can be ensured.
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 bimetallic element 3, the amplifying end drives a contact operating handle 61 to switch on or off a contact on the signal generator 6 and output an alarm and locking contact signal, 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 on or switched off.
Referring to fig. 2 and 3, specifically, the displacement amplification mechanism 7 includes a central shaft 71 in transmission connection with a rotating shaft 1021 of the pointer 102, two clamping plates 72 arranged on the base 2 in parallel and at intervals, a sector gear 73 rotatably connected between the two clamping plates 72, and a central gear 74 engaged with the sector gear 73 and fixedly connected with the central shaft 71, the signal adjustment mechanism 8 is arranged 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 sector gear 73 is provided with rotor arm 731, and the one end that rotor arm 731 keeps away from sector gear 73 is the initiating terminal, and the initiating terminal is provided with connecting rod 11, and the one end that connecting rod 11 kept away from the initiating terminal is provided with linking arm 12, and the one end that linking arm 12 kept away from connecting rod 11 is connected with the other end of bimetallic element 3. Specifically, the signal adjusting mechanism 8 is three eccentric wheels mounted on the central shaft 71 at intervals, and since the radius of the sector gear 71 is three times smaller than that of the central gear 74, displacement amplification is performed. In the sulfur hexafluoride gas density monitor of the embodiment, the signal generator 6 adopts the micro switch, the control of the micro switch contact is controlled by the displacement amplifying mechanism 7 after amplification, and the displacement amplifying mechanism 7 is used for amplifying the displacement, so that the precision is improved, 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 amplification mechanism 7 for limiting the movement of the displacement amplification mechanism 7 to be too large, and when the alarm point signal acts, the start end of the displacement amplification mechanism 7 and the locking contact shockproof mechanism 9 are in contact with each other. Specifically, the locking contact shockproof mechanism 9 includes a fixing seat 91 disposed in the housing 1 and an elastic element 92 disposed on the fixing seat 91, wherein the elastic element 92 is disposed corresponding to the starting end of the transmission arm 731. Referring to fig. 5, a guide rail 911 is disposed on the fixing base 91, a waist hole 921 is disposed on the elastic element 92, and the elastic element 92 is fixed on the guide rail 911 by passing through the waist hole 921 via 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 gas density monitored by the density monitor reaches the alarm contact signal action, the transmission arm 731 and the elastic element 92 are contacted with each other.
When SF6When the vibration caused by the operation of the circuit breaker is transmitted to the density monitor, the Bardon tube 4 and the bimetallic element 3 of the density monitor can be caused to generate displacement and transmitted to the transmission arm 731 through the connecting rod 11 to cause the transmission arm 731 to swing back and forth, when the swing of the transmission arm 731 exceeds the position corresponding to the action of the alarm contact of the gas density monitor, the elastic element 92 can contact the starting end of the transmission arm 731 to prevent the transmission arm 731 from moving towards the direction corresponding to the action of the locking contact of the gas density monitor, the anti-seismic performance of the locking contact of the density monitor is greatly improved, and the SF is enabled to generate displacement6The vibration caused by the operation of the circuit breaker is not easy to cause the locking contact of the density monitor to generate misoperation, the circuit breaker can complete the 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 fixed seat 91, the structure cost is low, the structure is very simple, the simpler and more reliable, the production is also very beneficial, and meanwhile, the shockproof effect is very good.
Through comparison tests, in the same density monitor, without the locking contact signal shockproof mechanism 9, for example, in 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 0.57MPa, the locking contact (0.50MPa) of the density monitor malfunctions in an impact test with an impact amplitude of 50g and duration of 11ms, and the reclosing requirement of the circuit breaker is difficult to meet. On the other hand, if the locking contact signal shockproof mechanism 9 is added to the same density monitor, namely, for the density monitor with rated parameter 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, the locking contact (0.50MPa) of the density monitor will not generate false operation in the impact test with impact amplitude of 50g and duration of 11ms, thus the reclosing requirement of the circuit breaker can be satisfied. Therefore, the locking contact signal shockproof mechanism 9 is added, the shockproof performance is greatly improved due to the innovative design, meanwhile, the cost is good, the shockproof mechanism is very reliable, and the shockproof mechanism is favorable for production and large-scale popularization. Meanwhile, oil is not required to be filled, the oil leakage problem 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 the problem of temperature difference is solved, and the outer surface of the shell 1 is wrapped with a heat insulation layer.
When the gas density value changes, the bourdon tube 4 and the bimetallic 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, so that the contacts on the micro switches 601, 602 and 603 are switched on or off, and the micro switches send corresponding signals to complete the function of the density monitor.
The sulfur hexafluoride gas density monitor is based on the Badon tube 4, and corrects the changed pressure and temperature by using the bimetallic element 3 to reflect the change of the sulfur hexafluoride gas density. Under the pressure action of the measured medium sulfur hexafluoride gas, due to the action of the bimetallic element 3, the change of the density value and the corresponding change of the pressure value force the tail end of the bourdon tube 4 to generate corresponding elastic deformation-displacement, and the elastic deformation-displacement is transmitted to the central shaft 71 of the displacement amplifying mechanism 7 by means of the bimetallic element 3 and the connecting rod 11, and the central shaft 71 is transmitted to the pointer 102, so that the density value of the measured sulfur hexafluoride gas is indicated on the dial 103. If air leaks, the density value of the sulfur hexafluoride gas is reduced to a certain degree (reaching an alarm or locking value), the bourdon tube 4 generates corresponding downward displacement, the connecting arm 12 is enabled to move downward through the bimetallic 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 adjusting mechanisms 81, 82 and 83 to rotate, when the density value reaches a certain degree, the signal adjusting mechanisms 81, 82 and 83 trigger the contact operating handles 611, 612 and 613 of the corresponding micro switches 601, 602 and 603, the corresponding micro switches 601, 602 and 603 are connected, and corresponding signals (alarm or locking) are sent, so that the density of the sulfur hexafluoride gas in equipment such as an electric switch is monitored and controlled, and the electric switch and the like is enabled to work safely. If the density value is increased, the pressure value is correspondingly increased to a certain degree, the Bourdon tube 4 is correspondingly displaced upwards, the connecting arm 12 is displaced upwards through the bimetallic element 3 and is transmitted to the connecting rod 11, the connecting rod 11 is transmitted to the displacement amplification mechanism 7, the sector gear 73 is transmitted to the central shaft 71, the signal adjusting mechanisms 81, 82 and 83 rotate, when the density value is increased to a certain degree, 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 disconnected, and the signals (alarm or locking) are released.
The density monitoring mechanism 10 is arranged inside the shell 1 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.
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 galvanostat 22, a control module 23, a magnetic latching relay 24, an arcing indicator 25, a pressure anomaly indicator 26, a humidity sensor 27 and a moisture repeller 28.
The temperature sensor 14 is fixed on the right side face of the base 2 in a sealing mode, and the temperature sensor 14 is in contact with sulfur hexafluoride gas, so that the temperature value of the sulfur hexafluoride gas can be measured accurately. The pressure sensor 13 is fixed at the back of the base 2 in a sealing way, the amplifying circuit 15, the embedded computer 17, the power supply 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 galvanostat 22 are all fixed on the printed board 31, the printed board 31 is positioned at the back of the base 2, the amplifying circuit 15, the embedded computer 17, the power supply module 18, the analog-digital converter 16, the voltage-current converter 21 and the current galvanostat 22 are positioned at the periphery of the pressure sensor 13 at the back of the shell 1, and the moisture dispeller 28 is arranged at the lower part outside the shell 1.
The gas density monitor collects pressure and temperature signals through a pressure sensor 13 and a temperature sensor 14, the pressure and temperature signals are processed through an amplifying circuit 15 and transmitted to an analog-digital converter 16, the signals are processed through software of an embedded computer 17 and converted into gas density values, the remote transmission of the sulfur hexafluoride gas density values is realized through an RS485 communication module 19, and then the gas density of sulfur hexafluoride gas electrical equipment is monitored on line; and the gas density value is processed by the digital-to-analog converter 20, the voltage-to-current converter 21 and the current galvanostat 22, and then the gas density value of the sulfur hexafluoride is converted into a current signal to realize remote transmission, so that 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 abnormity threshold value, the embedded computer 17 drives the magnetic latching relay 24 to act through the control module 23, so that the pressure abnormity indicator 26 acts to send out pressure abnormity information; when the gas density value obtained by the embedded computer 17 exceeds the preset arcing pressure threshold value, the embedded computer 17 drives the magnetic latching relay 24 to act through the control module 23, so that the arcing indicator 25 acts to send out arcing information.
The gas density monitor acquires a humidity signal through a humidity sensor 27, the humidity signal is processed through an amplifying circuit 15 and transmitted to an analog-digital converter 16, the humidity signal is processed through an embedded computer 17, and when the humidity signal value obtained by the embedded computer 17 exceeds a preset humidity ultrahigh threshold value, the embedded computer 17 drives a magnetic latching relay 24 to act through a control module 23, so that a moisture dispeller 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 stop the operation of the moisture expeller 28.
The working principle or steps are as follows: by means of pressure sensor 13, temperature sensor14, amplifying the signals of the measured pressure and temperature by an amplifying circuit 15, processing the amplified signals of the pressure and temperature by a digital-analog converter 20, converting the pressure and temperature values into corresponding digital signals of the pressure and temperature, acquiring the digital signals by an embedded computer 17, and calculating the density P of the sulfur hexafluoride gas by the embedded computer 1720Density P of the sulfur hexafluoride gas20Converted into a voltage signal P by the A/D converter 1620UThen, the P of the voltage signal is converted by the voltage-current converter 2120UP converted into current signal20IThen the sulfur hexafluoride gas density P of the current signal is enabled through the action of the current galvanostat 2220IThe device can be used for remote transmission, and further can realize on-line monitoring of the density of sulfur hexafluoride gas electrical equipment. And can also be converted into a gas density value P through software processing of the embedded computer 1720Then the density value P of the sulfur hexafluoride gas is measured by the RS485 communication module 1920Realize the long-distance transmission and further realize the on-line monitoring of the gas density P of the sulfur hexafluoride gas electrical equipment20。
In addition, the gas density value P obtained when the embedded computer 17 obtains20When the preset pressure abnormity 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 abnormity indicator 26 acts to send out pressure abnormity information, and the pressure abnormity indicator 26 can be a red indicator light, an audible and visual alarm and an alarm horn. When the pressure is abnormal, the pressure alarm timely reminds workers that the fault exists and corresponding measures are taken, such as reminding the workers that the workers are not suitable to approach the equipment with the problem. Gas density value P obtained when embedded computer 1720When the set arcing 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 arcing indicator 25 acts to send out arcing information, and workers know that the electrical equipment is arcing and need to process and maintain in time.
The gas density monitor acquires a humidity signal through a humidity sensor 27, the humidity signal is processed through an amplifying circuit 15 and transmitted to an analog-digital converter 16, the humidity signal is processed through an embedded computer 17, when the humidity signal value PH obtained by the embedded computer 17 exceeds a preset humidity ultrahigh threshold value PHG, the embedded computer 17 drives a magnetic latching relay 24 to act through a control module 23, so that a moisture repeller 28 acts, the humidity of the density monitor is reduced, and the insulating property of the density monitor is ensured; when the humidity signal value PH is lower than the preset humidity drop 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-to-digital converter 16, the embedded computer 17, the power module 24, the RS485 communication module 33, and the digital-to-analog converter 20 each adopt an independent grounding mode to introduce the current in each loop to the ground after each loop is grounded, so as to avoid electromagnetic disturbance, further improve the anti-electromagnetic interference performance of the density monitor, and ensure the reliable operation of the density monitor.
In conclusion, the sulfur hexafluoride gas density monitor of the embodiment adopts the displacement amplification mechanism 7 to amplify the displacement, so that the precision of the density monitor is greatly improved. Meanwhile, pressure and temperature signals are acquired by the pressure sensor 13 and the temperature sensor 14, processed by the embedded computer 17 and converted into density values, and the density values of the sulfur hexafluoride gas can be converted into current signals (4-20 mA) after being processed by the analog-digital converter 16, the voltage-current converter 21 and the current galvanostat 22, so that remote transmission is realized, and the density of sulfur hexafluoride gas electrical equipment can be monitored on line. In addition, the density monitor adopts the micro switch as the signal generator 6, and the control of the micro switch contact is controlled by the displacement amplifying mechanism 7 after amplification, so that the precision is improved, and the high-precision effect is achieved, therefore, the precision is high, the contact electrical performance is good, the service life is long, and the temperature compensation performance is more accurate.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, 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 technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. An oilless antidetonation teletransmission formula sulfur hexafluoride gas density monitor which characterized in that includes:
the device comprises a shell (1), wherein a joint (101) communicated with the shell is arranged on the outer side of the shell (1), and a pointer (102) and a dial (103) for indicating density values are also arranged in the shell;
the base (2), the said base (2) is set up in the inside of the body (1);
a bimetal element (3), the bimetal element (3) being disposed inside the housing (1);
one end of the Bardon tube (4) is fixedly connected to the base (2), the other end of the Bardon tube (4) is connected with one end of the bimetallic element (3) through the end seat (5), and the Bardon tube (4) is communicated with the joint (101) through a conduit;
the signal generator (6), the said signal generator (6) is set up on the base (2) and has contact operating handle (61);
the displacement amplification mechanism (7) is a sector curved surface transmission mechanism, the starting end of the displacement amplification mechanism (7) is in transmission connection with the other end of the bimetallic element (3), and the amplification end drives a contact operating handle (61) to switch on or off a contact on the signal generator (6) and output an alarm and locking contact signal;
the signal adjusting mechanism (8) is arranged in the shell (1), 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 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 amplification mechanism (7) and is used for limiting the overlarge movement of the displacement amplification mechanism (7), and when the alarm point signal acts, the starting end of the displacement amplification mechanism (7) is in contact with the locking contact shockproof mechanism (9);
the density monitoring mechanism (10) is arranged inside the shell (1) 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.
2. The oil-free shock-resistant remote sulfur hexafluoride gas density monitor according to claim 1, wherein the displacement amplification mechanism (7) includes a central shaft (71) in transmission connection with a rotating shaft (1021) of the pointer (102), two clamping plates (72) arranged on the base (2) in parallel and at an interval, a sector gear (73) rotatably connected between the two clamping plates (72), and a central gear (74) engaged with the sector gear (73) and fixedly connected with the central shaft (71), the signal adjustment mechanism (8) is arranged 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).
3. The oil-free shock-resistant remote transmission type sulfur hexafluoride gas density monitor as claimed in claim 2, wherein a rotating arm (731) is arranged on the non-gear side of the sector gear (73), one end, away from the sector gear (73), of the rotating arm (731) is a starting end, a connecting rod (11) is arranged at the starting end, a connecting arm (12) is arranged at one end, away from the starting end, of the connecting rod (11), and one end, away from the connecting rod (11), of the connecting arm (12) is connected with the other end of the bimetallic element (3).
4. An oil-free shock-resistant remote sulfur hexafluoride gas density monitor as claimed in claim 3, wherein the locking contact shock-proof mechanism (9) comprises a fixing seat (91) disposed in the housing (1) and an elastic element (92) disposed on the fixing seat (91), the elastic element (92) being disposed corresponding to the start end of the transmission arm (731).
5. The oil-free earthquake-resistant remote transmission type sulfur hexafluoride gas density monitor as claimed in claim 4, wherein a guide rail (911) is arranged on the fixing seat (91), a waist hole (921) is arranged on the elastic element (92), and the elastic element (92) passes through the waist hole (921) through a screw (93) and is fixed on the guide rail (911).
6. The oil-free anti-seismic 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-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 galvanostat (22), and a control module (23);
the gas density monitor acquires pressure and temperature signals through a pressure sensor (13) and a temperature sensor (14), the pressure and temperature signals are processed through an amplifying circuit (15), transmitted to an analog-digital converter (16), processed through software of an embedded computer (17) and converted into a gas density value, the sulfur hexafluoride gas density value is transmitted remotely through an RS485 communication module (19), and then the gas density of sulfur hexafluoride gas electrical equipment is monitored online;
the gas density value is processed by a digital-to-analog converter (20), a voltage-to-current converter (21) and a current galvanostat (22), and then the gas density value is converted into a current signal, so that remote transmission is realized, and further, the gas density of sulfur hexafluoride gas electrical equipment is monitored on line.
7. An oil-free seismic remote sulphur hexafluoride gas density monitor as claimed in claim 6, wherein the density monitoring mechanism (10) further includes a magnetic hold relay (24), a arcing indicator (25), and a pressure anomaly indicator (26);
when the gas density value obtained by the embedded computer (17) exceeds a preset pressure abnormity threshold value, the embedded computer (17) drives the magnetic latching relay (24) to act through the control module (23), so that the pressure abnormity indicator (26) acts to send out pressure abnormity information; when the gas density value obtained by the embedded computer (17) exceeds the preset arcing pressure threshold value, the embedded computer (17) drives the magnetic latching relay (24) to act through the control module (23), so that the arcing indicator (25) acts to send out arcing information.
8. The oil-free seismic remote sulfur hexafluoride gas density monitor as claimed in claim 7, wherein the density monitoring mechanism (10) further includes a humidity sensor (27) and a moisture expeller (28);
the gas density monitor acquires a humidity signal through a humidity sensor (27), the humidity signal is processed through an amplifying circuit (15), transmitted to an analog-digital converter (16) and processed through an embedded computer (17), and when the humidity signal value obtained by the embedded computer (17) exceeds a preset humidity ultrahigh threshold value, the embedded computer (17) drives a magnetic latching relay (24) to act through a control module (23), so that a moisture dispeller (28) acts; and when the humidity signal value is lower than the preset humidity drop threshold value, the embedded computer (17) closes the magnetic latching relay (24) through the control module (23) to act, so that the moisture dispeller (28) stops working.
9. The oil-free shock-resistant remote sulfur hexafluoride gas density monitor according to any one of claims 6 to 8, wherein the pressure sensor (13), the temperature sensor (14), the amplifying circuit (15), the analog-digital converter (16), the embedded computer (17), the power module (18), the RS485 communication module (19) and the digital-analog converter (20) are respectively grounded independently.
10. An oil-free seismic remote sulphur hexafluoride gas density monitor as claimed in any one of claims 7 to 8, wherein the pressure anomaly indicator (26) is an indicator light, an audible and visual alarm or an alarm horn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011323353.7A CN112595628B (en) | 2020-11-23 | 2020-11-23 | Oilless anti-seismic remote sulfur hexafluoride gas density monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011323353.7A CN112595628B (en) | 2020-11-23 | 2020-11-23 | Oilless anti-seismic remote sulfur hexafluoride gas density monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112595628A true CN112595628A (en) | 2021-04-02 |
| CN112595628B CN112595628B (en) | 2024-04-05 |
Family
ID=75183908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011323353.7A Active CN112595628B (en) | 2020-11-23 | 2020-11-23 | Oilless anti-seismic remote sulfur hexafluoride gas density monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112595628B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441441A (en) * | 2021-12-31 | 2022-05-06 | 呼和浩特科林热电有限责任公司 | Gaseous on-line monitoring system of sulfur hexafluoride based on TDLAS |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200953314Y (en) * | 2005-11-11 | 2007-09-26 | 苏丽芳 | Antivibrating sulfurhexafluoride gas density relay |
| CN201044225Y (en) * | 2005-10-25 | 2008-04-02 | 苏丽芳 | Shake-proof sulfur hexafluoride gas density relay |
| WO2008064554A1 (en) * | 2006-11-30 | 2008-06-05 | Shanghai Roye Electric Science And Technology Co., Ltd. | Vibration-resisting pointer sf6 gas density relay |
| CN102543571A (en) * | 2012-02-14 | 2012-07-04 | 上海乐研电气科技有限公司 | Anti-vibration sulfur hexafluoride gas density relay |
| CN103456561A (en) * | 2013-09-18 | 2013-12-18 | 上海乐研电气科技有限公司 | High-precision sulfur hexafluoride gas density relay |
| CN103594284A (en) * | 2013-11-20 | 2014-02-19 | 上海乐研电气科技有限公司 | Sulfur hexafluoride gas density relay |
| CN104282485A (en) * | 2014-10-31 | 2015-01-14 | 国家电网公司 | Remote-transmission sulfur hexafluoride gas density relay |
| CN104299846A (en) * | 2014-10-31 | 2015-01-21 | 国家电网公司 | Wireless remote transmission type sulfur hexafluoride gas density relay |
| CN104319172A (en) * | 2014-10-31 | 2015-01-28 | 国家电网公司 | Teletransmission sulfur hexafluoride gas density and trace moisture relay |
| CN208589392U (en) * | 2018-09-10 | 2019-03-08 | 西安共创电力科技有限责任公司 | A kind of oil-free extra-heavy vibration-resisting sulfur hexafluoride density controller |
| CN209929222U (en) * | 2019-04-17 | 2020-01-10 | 国网江苏省电力有限公司宿迁供电分公司 | Remote transmission type sulfur hexafluoride gas density controller |
| CN111952105A (en) * | 2020-07-07 | 2020-11-17 | 国家电网有限公司 | Full-range high-precision remote transmission type sulfur hexafluoride gas density relay |
-
2020
- 2020-11-23 CN CN202011323353.7A patent/CN112595628B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201044225Y (en) * | 2005-10-25 | 2008-04-02 | 苏丽芳 | Shake-proof sulfur hexafluoride gas density relay |
| CN200953314Y (en) * | 2005-11-11 | 2007-09-26 | 苏丽芳 | Antivibrating sulfurhexafluoride gas density relay |
| WO2008064554A1 (en) * | 2006-11-30 | 2008-06-05 | Shanghai Roye Electric Science And Technology Co., Ltd. | Vibration-resisting pointer sf6 gas density relay |
| CN102543571A (en) * | 2012-02-14 | 2012-07-04 | 上海乐研电气科技有限公司 | Anti-vibration sulfur hexafluoride gas density relay |
| CN103456561A (en) * | 2013-09-18 | 2013-12-18 | 上海乐研电气科技有限公司 | High-precision sulfur hexafluoride gas density relay |
| CN103594284A (en) * | 2013-11-20 | 2014-02-19 | 上海乐研电气科技有限公司 | Sulfur hexafluoride gas density relay |
| CN104282485A (en) * | 2014-10-31 | 2015-01-14 | 国家电网公司 | Remote-transmission sulfur hexafluoride gas density relay |
| CN104299846A (en) * | 2014-10-31 | 2015-01-21 | 国家电网公司 | Wireless remote transmission type sulfur hexafluoride gas density relay |
| CN104319172A (en) * | 2014-10-31 | 2015-01-28 | 国家电网公司 | Teletransmission sulfur hexafluoride gas density and trace moisture relay |
| CN208589392U (en) * | 2018-09-10 | 2019-03-08 | 西安共创电力科技有限责任公司 | A kind of oil-free extra-heavy vibration-resisting sulfur hexafluoride density controller |
| CN209929222U (en) * | 2019-04-17 | 2020-01-10 | 国网江苏省电力有限公司宿迁供电分公司 | Remote transmission type sulfur hexafluoride gas density controller |
| CN111952105A (en) * | 2020-07-07 | 2020-11-17 | 国家电网有限公司 | Full-range high-precision remote transmission type sulfur hexafluoride gas density relay |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441441A (en) * | 2021-12-31 | 2022-05-06 | 呼和浩特科林热电有限责任公司 | Gaseous on-line monitoring system of sulfur hexafluoride based on TDLAS |
| CN114441441B (en) * | 2021-12-31 | 2023-11-28 | 呼和浩特科林热电有限责任公司 | Sulfur hexafluoride gas on-line monitoring system based on TDLAS |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112595628B (en) | 2024-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021218289A1 (en) | Gas density relay with online self-checking function, and checking method therefor | |
| WO2011140986A1 (en) | Sulfur hexafluoride gas density relay | |
| CN111443283A (en) | Gas density relay online calibration device and online calibration method thereof | |
| CN104282485A (en) | Remote-transmission sulfur hexafluoride gas density relay | |
| CN112595628A (en) | Oil-free anti-seismic remote transmission type sulfur hexafluoride gas density monitor | |
| CN111446117A (en) | Gas density relay with online self-checking function and checking method thereof | |
| CN104299846B (en) | Wireless remote transmission type sulfur hexafluoride gas density relay | |
| CN104319172B (en) | A kind of telemetering type sulfur hexafluoride gas density micro-water relay | |
| CN209929222U (en) | Remote transmission type sulfur hexafluoride gas density controller | |
| EP4027155A1 (en) | Transformation method for gas density relay, and gas density relay having online self-check function and check method thereof | |
| CN110514996B (en) | Transformation method of gas density relay | |
| CN216698221U (en) | Remote transmission gas density relay | |
| CN110927566A (en) | Gas density relay with online self-checking function and checking method thereof | |
| CN115881471A (en) | Intelligent gas density relay | |
| CN213986833U (en) | GIS/GCB circuit breaker three-phase on-off state monitoring device | |
| CN211426166U (en) | Gas density relay with online self-checking function and monitoring device | |
| CN212646903U (en) | Online calibration device of gas density relay | |
| CN211179416U (en) | Gas density relay with online self-checking function and monitoring device | |
| CN204270973U (en) | A kind of wireless remote transmission formula sulfur hexafluoride gas density relay | |
| CN210668211U (en) | Gas density relay based on ubiquitous power internet of things application | |
| CN208093438U (en) | A kind of gas density relay of middle part outlet | |
| CN110542853A (en) | Gas density relay with online self-checking function and checking method thereof | |
| CN204102803U (en) | A kind of telemetering type sulfur hexafluoride gas density relay | |
| CN216849774U (en) | Remote transmission anti-vibration gas density relay | |
| CN110867336A (en) | Three-station electric isolating switch special for 40.5kV environment-friendly inflatable cabinet and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |