CN109216107B - High-precision SF (sulfur hexafluoride) 6 Gas density relay and implementation method thereof - Google Patents
High-precision SF (sulfur hexafluoride) 6 Gas density relay and implementation method thereof Download PDFInfo
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- CN109216107B CN109216107B CN201811136564.2A CN201811136564A CN109216107B CN 109216107 B CN109216107 B CN 109216107B CN 201811136564 A CN201811136564 A CN 201811136564A CN 109216107 B CN109216107 B CN 109216107B
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- 229910018503 SF6 Inorganic materials 0.000 title claims description 9
- 238000000034 method Methods 0.000 title claims description 9
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims description 9
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims description 9
- 230000007246 mechanism Effects 0.000 claims abstract description 107
- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 101000635799 Homo sapiens Run domain Beclin-1-interacting and cysteine-rich domain-containing protein Proteins 0.000 claims description 10
- 102100030852 Run domain Beclin-1-interacting and cysteine-rich domain-containing protein Human genes 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000033001 locomotion Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/36—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by curled flexible tube, e.g. Bourdon tube
Abstract
A high-precision SF6 gas density relay comprises a gas density relay shell, a base, an end seat, a Bardon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of micro switches serving as signal generators, wherein the base, the end seat, the Bardon tube and the temperature compensation element are arranged in the shell; one end of the micro switch contact trigger element is fixed in the shell, and the other end of the micro switch contact trigger element is correspondingly arranged with the buttons of the button type micro switches and is correspondingly abutted against the buttons of each micro switch one by one; when the gas density value changes, the barden tube and the temperature compensation element generate displacement, the displacement drives the micro switch contact trigger element through the signal trigger mechanism in sequence, and the micro switch contact trigger element changes in position, so that the micro switch sends out corresponding signals, and the function of the gas density relay is completed. The density relay has the advantages of high precision and good contact conduction performance, and can be well applied to SF6 electrical equipment.
Description
Technical Field
The invention relates to a gas density relay, in particular to a high-precision SF 6 A gas density relay and a method for improving the accuracy of the gas density relay.
Background
SF 6 And the mixed gas thereof or other environment-friendly gas electric products are widely applied to the power departments and industrial and mining enterprises, and the rapid development of the power industry is promoted. And SF (sulfur hexafluoride) 6 The arc extinguishing medium and the insulating medium of the electric product are SF 6 Gas cannot leak. If air leakage occurs, SF cannot be ensured 6 The electric products can reliably and safely run. So SF is monitored 6 SF of electric product 6 Density values are necessary.
At present, a mechanical pointer SF is commonly adopted 6 Gas density relay to monitor SF 6 Density, i.e. when SF 6 The relay can alarm and lock when the electric product leaks, and can display the on-site density value. The contact of the density relay generally adopts a hairspring type magnetic-assisted electric contact, although the magnetic-assisted suction force is increased. However, this magnetic-assisted electric contact density relay generally uses a hairspring type electric contact, and since the movable contact moves with the pointer when the density is higher than the set value, the force of the hairspring cannot be large, otherwise the display value is inaccurate. In addition, the magnetic attraction force cannot be adjusted to be too large, otherwise, the return value of the density relay is large and exceeds the technical standard. Therefore, for the magnetically assisted electric contact, the contact is not enabled or is unreliable in contact if the contact is oxidized due to the small contact closing force and the slightly long time. For oil-free type, the magnetically assisted electric contact is exposed to air, is very easy to oxidize or accumulate dust, and the contact is easy to contact and not to contact Good or bad. It is particularly emphasized that in coastal areas, due to the moisture of the air, salt mist is contained, which is more likely to cause contact failure or failure. In the case of oil-filled type, although the magnetically assisted electrical contact is immersed in silicone oil, the contact performance of the contact is reduced after a plurality of operations, and the contact is not good or is not good due to the insulation of an oil film. Experiments have shown that contact unreliability phenomena occur, especially at low temperatures. In addition, the density relay has oil leakage defect, and the magnetic-assisted electric contact point contact of the density relay is exposed to air, so that the density relay is very easy to oxidize or even accumulate dust, and the contact point is easy to be in poor contact or not in communication.
The SF of a micro switch is also developed in the market 6 Gas density relay, SF 6 The micro switch adopted by the gas density relay is provided with a swing rod (or an operation arm is arranged on the micro switch), the structure of the micro switch is as shown in fig. 1, and as the swing rod 902 is provided with a shaft 903, the shaft 903 is arranged on the micro switch 9. In order to allow a flexible rotation of the pendulum 902, the shaft 903 is provided with play on the microswitch 9, and the shaft 903 is made of a thin sheet, not very round, with a large play, which causes the pendulum 902 to also rock. Because the displacement of the bowden tube is also small, there is a gap and a wobble is generated, so that the accuracy of the density relay is not very stable. Because the swing rod has a gap and swings, the position of the swing rod changes, so that the precision of the micro-switch type density relay is deviated, the micro-switch type density relay is not very stable, and the high precision of the density relay is difficult to realize. SF as described above 6 Although the micro switch adopted by the gas density relay has certain advantages, the micro switch still has the following problems in use due to the unreasonable structure:
1) When vibrating, the swing rod has a gap, and the position of the swing rod is slightly changed, so that the precision of the density relay is seriously affected.
2) Meanwhile, during debugging, accuracy is difficult to adjust, namely, a high-accuracy density relay is difficult to manufacture.
In view of the above, it is necessary to develop a high precisionHigh electrical performance gas density relay to ensure SF 6 The gas electric equipment works reliably.
Disclosure of Invention
In order to solve the problems of the prior art, the invention aims to provide a high-precision SF with good electrical performance 6 Gas density relay for controlling and monitoring SF in sealed container 6 Density of the gas and for SF 6 And the gas leakage condition in the electrical equipment for waiting for gas can timely send out an alarm signal and a locking signal, thereby playing a role in ensuring the safety of electric power.
High-precision SF (sulfur hexafluoride) 6 The gas density relay comprises a gas density relay shell, a base, an end seat, a Bardon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of micro switches serving as signal generators, wherein the base, the end seat, the Bardon tube, the temperature compensation element and the signal adjusting mechanism are arranged in the shell; one end of the Bardon tube is connected to the base, the other end of the Bardon tube is connected to an end seat, one end of the temperature compensation element is connected to the end seat, and the other end of the temperature compensation element is connected with the signal regulating mechanism;
The micro switch is a button type micro switch;
the gas density relay further comprises a micro-switch contact trigger element, one end of the micro-switch trigger element is provided with a fixed shaft, the micro-switch contact trigger element is fixed in the shell through the fixed shaft, the micro-switch trigger element can move around the fixed shaft relative to the micro-switch, and the other end of the micro-switch trigger element is correspondingly arranged with the buttons of the button-type micro-switches and is abutted against the buttons of each micro-switch in a one-to-one correspondence manner;
when the gas density value changes, the barden tube and the temperature compensation element generate displacement, the displacement drives the micro switch contact trigger element sequentially through the signal adjusting mechanism, and when the gas density value reaches a corresponding set value, the micro switch contact trigger element presses or is far away from a button of the micro switch, so that the micro switch generates a corresponding signal, and the function of the gas density relay is completed.
The temperature compensation device is characterized by further comprising a display core, a dial and a pointer, wherein one end of the temperature compensation element is connected with the display core through a display connecting rod or one end of the temperature compensation element is directly connected with the display core, and the pointer is arranged on the display core and is arranged in front of the dial.
High-precision SF (sulfur hexafluoride) 6 The gas density relay comprises a relatively independent signal control part and an indication display part; the signal control part comprises a control base, a control end seat, a control Bardon tube, a control temperature compensation element, a signal adjusting mechanism and a plurality of microswitches serving as signal generators; one end of the control Bardon tube is connected to the control base, the other end of the control Bardon tube is connected to the control end seat, one end of the control temperature compensation element is connected to the control end seat, and the other end of the control temperature compensation element is connected with the signal adjusting mechanism;
the micro switch is a button type micro switch;
the gas density relay further comprises a micro-switch contact trigger element, one end of the micro-switch trigger element is provided with a fixed shaft, the micro-switch contact trigger element is fixed in the shell through the fixed shaft, the micro-switch trigger element can move around the fixed shaft relative to the micro-switch, and the other end of the micro-switch trigger element is correspondingly arranged with the buttons of the button-type micro-switches and is abutted against the buttons of each micro-switch in a one-to-one correspondence manner;
When the gas density value changes, the barden tube and the temperature compensation element generate displacement, the displacement drives the micro switch contact trigger element through the signal adjusting mechanism in sequence, and when the gas density value reaches a corresponding set value, the micro switch contact trigger element presses or is far away from a button of the micro switch, so that the micro switch generates a corresponding signal, and the function of the gas density relay is completed;
the display value display part comprises a display barden tube, a display temperature compensation element, a display base, a display end seat, a display machine core, a dial and a pointer, wherein one end of the display barden tube is connected to the display base, the other end of the display barden tube is connected to the display end seat, one end of the display temperature compensation element is connected to the display end seat, the other end of the display temperature compensation element is connected with the display machine core through a display connecting rod or the other end of the temperature compensation element is directly connected with the display machine core, and the pointer is installed on the display machine core and is arranged in front of the dial.
The micro switch contact trigger device also comprises an elastic piece, wherein the elastic piece is fixed in the shell and is arranged corresponding to the micro switch contact trigger element.
The micro-switch contact trigger element is characterized by further comprising a limiting piece, wherein the limiting piece limits the signal adjusting mechanism to move in a certain range, and the micro-switch contact trigger element is protected to move in a certain range all the time.
The signal adjusting mechanism is provided with an adjusting screw.
The shape of the micro-switch contact trigger element can be straight or bent.
The relative position of the micro-switch contact trigger element and the micro-switch can be horizontal or inclined.
The effective width of the contact part between the front end of the micro switch contact trigger element and the signal adjusting mechanism is 4.0-18mm.
The device also comprises a limiting mechanism, and when the density relay is vibrated, the limiting mechanism ensures that the signal adjusting mechanism moves in a normal working range.
The vibration-proof density relay further comprises a buffer balance mechanism, and the buffer balance mechanism improves the vibration-proof level of the density relay.
The temperature compensation element is a bimetallic strip or a baron tube filled with gas.
The signal control part is provided with an anti-misoperation mechanism.
The gas density relay also comprises a pressure sensor, a temperature sensor, a signal processing unit and a signal transmission unit, wherein the signal transmission unit is provided with a remote transmission signal, and density on-line monitoring is realized.
And a limiting mechanism is also adjustably arranged in the shell, and limits the signal adjusting mechanism to a set corresponding position which is larger than the density alarm value.
A method of improving the accuracy of a gas density relay, comprising: the gas density relay comprises a gas density relay shell, a base, an end seat, a Bardon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of microswitches serving as signal generators, wherein the base, the end seat, the Bardon tube, the temperature compensation element and the signal adjusting mechanism are arranged in the shell; one end of the Bowden tube is connected to the base, the other end of the Bowden tube is connected to an end seat, one end of the temperature compensation element is connected to the end seat, and the other end of the temperature compensation element is connected to the signal adjusting mechanism; the micro switch is a button type micro switch; the gas density relay further comprises a micro-switch contact trigger element, one end of the micro-switch trigger element is provided with a fixed shaft, the micro-switch contact trigger element is fixed in the shell through the fixed shaft, the micro-switch trigger element can move around the fixed shaft relative to the micro-switch, and the other end of the micro-switch trigger element is correspondingly arranged with the buttons of the button-type micro-switches and is abutted against the buttons of each micro-switch in a one-to-one correspondence manner;
when the gas density value changes, the barden tube and the temperature compensation element generate displacement, the displacement drives the micro switch contact trigger element through the signal adjusting mechanism in sequence, and when the gas density value reaches a corresponding set value, the micro switch contact trigger element presses or is far away from a button of the micro switch, so that the micro switch generates a corresponding signal, and the function of the gas density relay is completed;
When the gas density of the electrical equipment is reduced, the baron tube and the temperature compensation element of the gas density relay are displaced, the signal adjusting mechanism is also displaced, and at the moment, the contact trigger element of the micro switch is also displaced, so that the micro switch sends out corresponding signals to a certain extent.
The micro switch contact trigger device also comprises an elastic piece, wherein the elastic piece is fixed in the shell and is arranged corresponding to the micro switch contact trigger element.
When the signal regulating mechanism generates displacement, the micro switch contact trigger element generates displacement under the action of the elastic force of the elastic piece and/or the elastic force of the micro switch button and/or the thrust of the signal regulating mechanism, and when the set value is reached, the micro switch generates corresponding alarm or locking signal
The invention relates to a high-precision SF 6 Compared with the prior art, the gas density relay has the following obvious advantages and characteristics due to the adoption of the technical scheme:
1. because the micro switch is adopted as the signal generator of the density relay, the reliable conduction of the contact can be ensured, and the reliable operation of the system can be ensured.
2. Because the micro-switch contact trigger element which comprises a shaft and moves along the shaft is adopted, one end of the micro-switch contact trigger element is connected to the shaft, and the other end of the micro-switch contact trigger element is correspondingly arranged with the button of the button type micro-switch and is abutted against the button of each micro-switch in a one-to-one correspondence manner; the micro-switch contact trigger element enables the micro-switch to send out corresponding alarm or locking signals by means of the elasticity of the elastic piece or the thrust of the signal adjusting mechanism. One end of the micro-switch contact trigger element is connected to the shaft, and the shaft is machined, is quite round, can be matched very well, has quite small clearance, avoids swinging, and further cannot cause poor precision, and basically cannot influence the precision of the density relay during vibration or transportation, so that the precision of the density relay is quite stable. Meanwhile, during debugging, the precision is easily adjusted very accurately, and a high-precision density relay is easily manufactured.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a microswitch of a prior art pointer gas density relay;
FIG. 2 shows a high precision SF according to a first embodiment of the present invention 6 A schematic structure of the gas density relay;
FIG. 3 shows a high precision SF according to a first embodiment of the present invention 6 A schematic cross-sectional view of a gas density relay;
FIG. 4 shows a high precision SF according to a first embodiment of the present invention 6 Gas density relayA micro-switch signal structure illustration diagram;
FIG. 5 shows a high-precision SF for a second embodiment of the present invention 6 A schematic cross-sectional view of a gas density relay;
FIG. 6 shows a high-precision SF for a second embodiment of the present invention 6 A micro-switch signal structure illustration diagram of the gas density relay;
FIG. 7 shows a high-precision SF for a third embodiment of the present invention 6 A micro-switch signal structure illustration diagram of the gas density relay;
FIG. 8 shows a high-precision SF for a fourth embodiment of the present invention 6 A micro-switch signal structure illustration diagram of the gas density relay;
FIG. 9 shows a high-precision SF according to a fifth embodiment of the present invention 6 A micro-switch signal structure illustration diagram of the gas density relay;
FIG. 10 shows a high-precision SF for a sixth embodiment of the present invention 6 A schematic cross-sectional view of a gas density relay;
FIG. 11 shows a high precision SF of the present invention 6 One embodiment of a micro-switch contact trigger element for a gas density relay is shown;
FIG. 12 shows a high precision SF of the present invention 6 Another embodiment of a micro-switching contact trigger element for a gas density relay is illustrated.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a high-precision gas density relay for illustration and explanation. Referring specifically to fig. 2, 3 and 4, fig. 2 and 3 are schematic partial cross-sectional views of a sulfur hexafluoride gas density relay according to an embodiment of the invention, as shown in fig. 2, 3 and 4, according to the inventionEmbodiment one discloses a high precision SF 6 Gas density relay with SF 6 Gas density relays are examples. The invention relates to a high-precision SF 6 The gas density relay mainly comprises a connector 1, a display movement 2, a shell 3, a dial 4, a pointer 5, a barton tube 6, a temperature compensation sheet 7 (the width is 5.5-18 mm), a wire holder 8, a plurality of micro-switches 91, 92, 93 (three are taken as examples in the present case) of a printed circuit board 10, a fixed plate 11, a signal adjusting mechanism 12, a plurality of adjusting screws 131, 132, 133, a pull rod 14, a watch glass 15, a cover ring 16, a limiting mechanism 17, an end holder 18, a base 19, micro-switch contact trigger elements 201, 202, 203, a limiting piece 21, a micro-switch contact trigger element fixing piece 22, an anti-misoperation mechanism 23, a shaft 26, an elastic piece 27 and the like. Wherein the joint 1 is fixed on the casing 3, and the display movement 2 is fixed on the base 19. One end of the bowden tube 6 is welded to and communicates with the base 19 and the other end is welded to the end seat 18. And the end seat 18 is connected with one end of the temperature compensation sheet 7, and the other end of the temperature compensation sheet 7 is connected with the signal adjusting mechanism 12. Three adjusting screws 131, 132, 133 are fixed to the signal adjusting mechanism 12. The signal adjusting mechanism 12 is connected with a connecting rod 14, and the connecting rod 15 is connected with the display movement 2. The three microswitches 91, 92, 93 are each fixed to the printed circuit board 10, the printed circuit board 10 is fixed to the fixed plate 11, and the fixed plate 11 is in turn mounted on the base 19. The microswitches 91, 92, 93 are button microswitches with buttons 9101, 9201, 9301, respectively. The microswitch contact activation elements are independently movable along axes 26 (261, 262, 263, respectively). The shafts 26 (261, 262, 263, respectively) are fixed to the fixing members 22, respectively. That is, the micro-switch contact triggering elements 201, 202, 203 are respectively fixed to the fixing member 22 by shafts 26 (261, 262, 263 respectively), which are machined, very round, fit very well, have a very small clearance, and can prevent the micro-switch contact triggering elements 201, 202, 203 from swinging. The fixture 22 is secured within the housing such that the microswitch contact activation elements 201, 202, 203 are secured within the housing by the shaft 26. The micro-switch contact trigger elements 201, 202, 203 are provided corresponding to the micro-switches 91, 92, 93, respectively, that is, the micro-switch contact trigger elements 201, 202, 203 are provided corresponding to the buttons 9101, 9201, 9301 of the micro switches 91, 92, 93, respectively, and the micro switch contact trigger elements 201, 202, 203 are provided corresponding to the upper portions of the respective adjustment screws 131, 132, 133, respectively, and the elastic members 27 (271, 272, 273, respectively) are provided corresponding to the micro switch contact trigger elements 201, 202, 203, respectively, as shown in fig. 4, wherein the micro switch contact trigger element 201 is fixed above the adjustment screw 131, the micro switch contact trigger element 202 is fixed above the adjustment screw 132, and the micro switch contact trigger element 203 is fixed above the adjustment screw 133. The stopper 21 is fixed in the housing, and the stopper 21 is provided corresponding to the micro-switch contact trigger elements 201, 202, 203. The pointer 5 and the dial 4 are respectively fixed on the display movement 2. The signal contacts of the micro-switch are connected to the wire holder 8 from the printed circuit board 10 through wires, and the wire holder 8 is fixed on the housing 3. The watch glass 15 and the cover ring 16 are fixed on the shell 3 respectively, and can protect the internal mechanism from mechanical damage and dirt and rainwater invasion. The limiting mechanism 17 is fixed in the shell, and a gap is reserved between the limiting mechanism and the signal adjusting mechanism 12. The limiting mechanism 17 has the function of preventing the signal adjusting mechanism 12 from generating excessive displacement along the axial direction when the switch is opened or closed to generate vibration, preventing the adjusting screws 131, 132 and 133 from being blocked or separated from the micro switch contact trigger elements 201, 202 and 203, and ensuring the reliable operation of the system. In this embodiment, the shape of the micro-switch contact triggering elements 201, 202, 203 is straight; the relative positions of the micro-switch contact triggering elements 201, 202, 203 and the micro-switches 91, 92, 93 are horizontal; the temperature compensation element 7 is made of a bimetallic strip material or is a compensating baron tube filled with gas. The gas density relay comprises a microswitch contact triggering element 20 comprising a shaft 26 and moving along the shaft, one end of the microswitch contact triggering element being connected to the shaft 26 and the other end being arranged in correspondence with the push buttons of said push button type microswitch and bearing against the push button of each microswitch one by one, so that the shaft 26 is machined, very round, very well fitted, with very small gaps, capable of avoiding rocking of the microswitch contact triggering elements 201, 202, 203. As can be seen from Table 1, the density of the present patent technique was measured by comparison The contact precision and stability of the relay are better than those of the density relay in the prior art, the density relay has outstanding substantive characteristics and remarkable progress, the precision and stability of the micro switch type density relay can be greatly improved, and the reliable and safe operation of a power grid is ensured.
From table 1, it can be known that the contact precision and stability of the density relay adopting the technology of the patent are very good, the requirement of high precision is met, and the environment adaptability of the density relay can be improved. Meanwhile, the key is that the stability is very good, and the precision is changed without vibration.
Table 1 comparative table of contact performance of the density relay of the present patent technology and the density relay of the prior art
The microswitch contact triggering elements 201, 202, 203 are each connected to the shaft 26, which is connected to the mount 22. Alternatively, the micro-switch contact triggering elements 201, 202, 203 are respectively fixed to the shaft 26, which is connected to the fixing member 22. The manner can be varied, and the swing of the micro switch contact triggering elements 201, 202 and 203 can be avoided as long as the fit between the shafts is ensured to be very good and the clearance is very small.
In addition, the relay is also provided with an anti-misoperation mechanism 23, and when the density relay is vibrated, the anti-misoperation mechanism 23 can limit the amplitude of the baron tube 6 and the signal regulating mechanism 12, so that the vibration resistance of the relay can be greatly improved, and the reliable operation of the system is ensured.
The invention relates to a high-precision SF 6 The principle of action of the gas density relay is based on the elastic element barden tube 6, the changing pressure and temperature are corrected by the temperature compensation sheet 7, and the change of the gas density is reflected. I.e. in the medium under test (e.g. SF 6 ) Under the action of the pressure of the gas, the change of the density value and the corresponding change of the pressure value of the temperature compensation sheet 7 force the tail end of the Bardon tube 6 to generate corresponding elastic deformation-displacement, and the elastic deformation-displacement is transmitted to the display movement by the aid of the temperature compensation sheet 7 and the connecting rod 142, the display movement 2 is transmitted to the pointer 5, and the measured gas density value is indicated on the dial 4. If the air leaks, the density value of the air leaks to a certain degree (reaches an alarm or locking value), the baron tube 6 generates corresponding downward displacement, the signal adjusting mechanism 12 is downwards displaced through the temperature compensation sheet 7, the adjusting screws 131, 132 and 133 on the signal adjusting mechanism 12 are gradually separated from the corresponding micro switch contact triggering elements 201, 202 and 203, the micro switch contact triggering elements 201, 202 and 203 are gradually separated from the buttons 9101, 9201 and 9301 of the corresponding micro switches 91, 92 and 93, and when the air leaks to a certain degree, the corresponding micro switch 91, 92 and 93 contacts are connected, and corresponding signals (alarm or locking) are sent out, so that the air density in the electric switch and other equipment is monitored and controlled, and the electric equipment is safely operated. If the density value is increased, the pressure value is correspondingly increased to a certain extent, the barden tube 6 is correspondingly displaced upwards, the signal adjusting mechanism 12 is displaced upwards by the temperature compensating plate 7, the adjusting screws 131, 132 and 133 on the signal adjusting mechanism 12 are displaced upwards, the corresponding micro switch contact triggering elements 201, 202 and 203 are pushed to displace upwards, the contacts of the micro switches 91, 92 and 93 are opened, and the signals (alarm or locking) are released. In summary, when the signal adjusting mechanism generates displacement, the micro switch contact trigger element generates displacement by means of the elastic force of the elastic piece 27, or by means of the elastic force of the micro switch button itself or by means of the thrust of the signal adjusting mechanism, and when the signal adjusting mechanism reaches a set value, the micro switch generates a corresponding alarm or locking signal.
The micro-switch and the adjusting screw are not limited to three, but can be one, two, four or more.
Fig. 5 is a schematic partial cross-sectional view of a sulfur hexafluoride gas density relay according to a second embodiment of the present invention, as shown in fig. 5 and 6, micro switch contact trigger elements 201, 202, 203 are correspondingly disposed under each of the adjusting screws 131, 132, 133, that is, the micro switch contact trigger element 201 is fixed under the adjusting screw 131, the micro switch contact trigger element 202 is fixed under the adjusting screw 132, and the micro switch contact trigger element 203 is fixed under the adjusting screw 133. The elastic members 27 (271, 272, 273) are provided corresponding to the micro switch contact triggering elements 201, 202, 203, respectively, as shown in fig. 6. The stopper 21 is fixed in the housing, and the stopper 21 is provided corresponding to the micro-switch contact trigger elements 201, 202, 203. If the electrical equipment leaks, the density value of the electrical equipment drops to a certain degree (reaches an alarm or locking value), the baron tube 6 generates corresponding downward displacement, the signal adjusting mechanism 12 is downwards displaced through the temperature compensation sheet 7, the adjusting screws 131, 132 and 133 on the signal adjusting mechanism 12 are close to the corresponding micro switch contact triggering elements 201, 202 and 203, the micro switch contact triggering elements 201, 202 and 203 are close to the buttons 9101, 9201 and 9301 of the corresponding micro switches 91, 92 and 93, and when the density value of the electrical equipment leaks to a certain degree, the micro switch contact triggering elements 201, 202 and 203 respectively drive the corresponding micro switch 91, 92 and 93 to be connected, and corresponding signals (alarm or locking) are sent, so that the air density in the electrical equipment such as the electrical switch is monitored and controlled, and the electrical equipment is safely operated. If the density value is increased, the pressure value is correspondingly increased, the barden tube 6 is also correspondingly moved upwards to a certain extent, the signal adjusting mechanism 12 is moved upwards by the temperature compensating plate 7, the adjusting screws 131, 132 and 133 on the signal adjusting mechanism 12 are moved upwards, the corresponding micro switch contact triggering elements 201, 202 and 203 are moved upwards under the action of the elasticity of the elastic piece 27 and the elasticity of the micro switch button, so that the contacts of the micro switches 91, 92 and 93 are opened, and the signal (alarm or locking) is released. Similarly, the limiting member 21 limits the adjusting screws 131, 132, 133 of the signal adjusting mechanism 12 to move within a certain range, so as to protect the micro switch contact triggering elements 201, 202, 203 from moving within the elastic range all the time, and the micro switch contact triggering elements 201, 202, 203 cannot generate elastic failure problem within the certain stress range, thereby ensuring high-precision realization and long-term stability of contact precision. The effective width of the contact parts of the front ends of the micro switch contact trigger elements 201, 202 and 203 and the adjusting screws 131, 132 and 133 of the signal adjusting mechanism 12 is 4.0-18mm, so that the vibration resistance is improved.
Fig. 7 and 8 show the high precision of the third and fourth embodiments of the present inventionDegree SF 6 As shown in fig. 7, the micro-switch signal structure of the gas density relay is shown in the figure, the micro-switch contact trigger elements 201, 202, 203 are bent, and the relative positions of the micro-switch contact trigger elements 201, 202, 203 and the micro-switches 91, 92, 93 are inclined. The shape of the micro-switch contact trigger element can be straight or bent, namely, the shape of the micro-switch contact trigger element can be straight or bent at different angles.
FIG. 9 shows a high-precision SF according to a fifth embodiment of the present invention 6 As shown in fig. 8, when the gas density of the electrical equipment is normal, the thrust of the adjusting screws 131, 132, 133 of the signal adjusting mechanism 12 presses the micro switch contact triggering members 201, 202, 203 against the push buttons 9101, 9201, 9301 of the micro switches 91, 92, 93. When gas leaks, the signal adjusting mechanism and the adjusting screw thereof generate displacement and are far away from the micro-switch contact trigger element, and the micro-switch contact trigger element respectively depends on the elasticity of the elastic piece or the elasticity of the micro-switch button, so that the micro-switch contact trigger element is far away from the buttons 9101, 9201 and 9301 of the micro-switches 91, 92 and 93, and when the micro-switch contact trigger element reaches a set value, the micro-switch sends out a corresponding alarm or locking signal.
FIG. 10 shows a high-precision SF for a sixth embodiment of the present invention 6 A schematic cross-sectional view of a gas density relay, a high precision SF as shown in FIG. 10 6 The gas density relay comprises a relatively independent signal control part and an indication display part; the signal control part comprises a control base 19, a control end seat 18A, a control bardendrine 6A, a control temperature compensation element 7A, a signal regulating mechanism 12 and a plurality of microswitches 91, 92 and 93 serving as signal generators; one end of the control barden tube 6A is connected to the control base 19, the other end of the control barden tube 6A is connected to one end of the control temperature compensation element 7A, and the other end of the control temperature compensation element 7A is connected to the signal adjustment mechanism 12. The micro-switches 91, 92, 93 are push button micro-switches, the gas density relay further comprises micro-switch contact trigger elements 201, 202, 203 which comprise shafts and move along the shafts, and one ends of the micro-switch contact trigger elements 201, 202, 203 are fixed in the shellThe other end of the shaft which can flexibly rotate and has very small clearance is correspondingly arranged with the buttons of the button type micro-switches 91, 92 and 93 and is abutted against the buttons of each micro-switch in a one-to-one correspondence manner. When the gas density value changes, the control baron tube 6A and the control temperature compensation element 7A generate displacement, the displacement sequentially drives the micro switch contact trigger elements 201, 202 and 203 through the adjusting screws 131, 132 and 133 of the signal adjusting mechanism 12, and the micro switch contact trigger elements 201, 202 and 203 generate position change, so that the micro switches 91, 92 and 93 respectively send out corresponding signals, and the function of the gas density relay is completed. The high precision SF 6 The gas density relay includes a buffer balance mechanism 24, which buffer balance mechanism 24 supports the signal conditioning mechanism 12, further increasing the vibration resistance level of the density relay. In addition, the high precision SF 6 The gas density relay is adjustably mounted with a spacing mechanism 25, the spacing mechanism 25 has elasticity, and the signal adjusting mechanism 12 is limited to a corresponding position which is set and is larger than the density alarm value, and the vibration resistance of the density relay can be further improved.
Meanwhile, the high-precision density relay of this embodiment further includes a relatively independent indication display portion including a display baron tube 6B, a display temperature compensation element 7B, a display base 19, a display end seat 18B, a display movement 2, a dial, and a pointer 5, as shown in fig. 10. One end of the display barden tube 6B is connected to the display base 19, the other end is connected to one end of the display temperature compensation element 7B through the display end seat 18B, the other end of the display temperature compensation element 7B is connected to the display movement 2 through the display connecting rod 14 or the other end of the temperature compensation element 7B is directly connected to the display movement 2, and the pointer 5 is installed on the display movement 2 and arranged in front of the dial and used for indicating the gas density value. The control base and the display base are combined into a whole, and can be separated.
In addition, the high-precision SF of the invention 6 The gas density relay can also comprise a pressure sensor, a temperature sensor, a signal processing unit and a signal transmission unit, and is provided with a remote transmission signal to realize density on-line monitoring.
The invention relates to a method for improving the precision of a gas density relay, as shown in fig. 2, 3 and 4, comprising the following steps: comprises a gas density relay shell 3, a base 19 arranged in the shell 3, an end seat 18, a barden tube 6, a temperature compensation element 7, a signal adjusting mechanism 12 and a plurality of micro switches 91, 92 and 93 which are used as signal generators; one end of the barden tube 6 is connected to the base 19, the other end of the barden tube 6 is connected to the end seat 18, one end of the temperature compensation element 7 is connected to the end seat 18, and the other end of the temperature compensation element 7 is connected to the signal adjusting mechanism 12; the micro switches 91, 92, 93 are button type micro switches; the gas density relay further comprises micro switch contact trigger elements 201, 202 and 203 which comprise shafts 26 and move along the shafts, namely one ends of the micro switch contact trigger elements 201, 202 and 203 are fixed on the shafts 26 which can flexibly rotate and have very small gaps through fixing pieces 22, and the other ends of the micro switch contact trigger elements are arranged corresponding to buttons 9101, 9201 and 9301 of the button type micro switches and are abutted against the buttons 9101, 9201 and 9301 of each micro switch in a one-to-one correspondence manner; when the gas density value changes, the barden tube 6 and the temperature compensation element 7 displace, the displacement sequentially passes through the adjusting screws 131, 132 and 133 of the signal adjusting mechanism 12, the adjusting screws 131, 132 and 133 respectively drive the micro switch contact triggering elements 201, 202 and 203, and the positions of the micro switch contact triggering elements 201, 202 and 203 are respectively changed, so that the micro switches 91, 92 and 93 send corresponding signals, and the function of the gas density relay is completed. That is, when the gas density of the electrical equipment is lowered, the baron tube 6 and the temperature compensation element 7 of the gas density relay are displaced, the signal adjusting mechanism 12 is also displaced, and at this time, the micro switch contact triggering elements 201, 202, 203 are also displaced, and when the micro switches 91, 92, 93 are caused to emit corresponding signals to a certain extent. In summary, when the signal adjusting mechanism 12 is displaced, at this time, the micro switch contact triggering elements 201, 202, 203 rely on the elastic force of the elastic member 27 and/or rely on the thrust of the adjusting screws 131, 132, 133 of the signal adjusting mechanism 12, so that the micro switch contact triggering elements 201, 202, 203 are also displaced, and when the set value is reached, the micro switch is caused to send out a corresponding alarm or locking signal.
The innovation point and the core point of the invention are as follows: because the micro-switch contact trigger element which comprises a shaft and moves along the shaft is adopted, one end of the micro-switch contact trigger element is connected to the shaft, and the other end of the micro-switch contact trigger element is correspondingly arranged with the button of the button type micro-switch and is abutted against the button of each micro-switch in a one-to-one correspondence manner; the micro-switch contact trigger element enables the micro-switch to send out corresponding alarm or locking signals by means of the elasticity of the elastic piece or the thrust of the signal adjusting mechanism. One end of the micro-switch contact trigger element is connected to the shaft, and the shaft is machined, is quite round, can be matched very well, has quite small clearance, avoids swinging, and further cannot cause poor precision, and basically cannot influence the precision of the density relay during vibration or transportation, so that the precision of the density relay is quite stable. Meanwhile, during debugging, the precision is easily adjusted very accurately, and a high-precision density relay is easily manufactured. Meanwhile, as the micro switch is adopted as the signal generator of the density relay, the reliable conduction of the contact point can be ensured, the reliable operation of the system can be ensured, the safe operation of the power grid can be ensured, and the micro switch can be well applied to SF 6 And the like. Tests show that the technology has outstanding substantive characteristics and remarkable progress, can greatly improve the precision and stability of the micro-switch type density relay, and ensures the reliable and safe operation of a power grid.
As shown in fig. 11, the micro-switch contact trigger element 20 is coupled to a shaft 26 that is coupled to a mount 22. Alternatively, as shown in fig. 12, the microswitch contact activation element 20 is fixed to a shaft 26 that is connected to the mount 22. The manner can be varied, and the swing of the micro-switch contact trigger element 20 can be avoided as long as the fit between the shafts is ensured to be very good and the gap is very small. As shown in FIG. 11, the height of the two side baffles at the front end of the micro-switch contact trigger element 20 is 2.6-18mm, the front end of the micro-switch contact trigger element 20 can be provided with an end plate B respectively, and the end plate B and the two side baffles C together form a limiting adjusting screw together with the front end of the micro-switch contact trigger element 20 to be separated from the micro-switch contactA semi-enclosed region of the hair member 20. After adopting the measure, the high-precision SF of the invention 6 When the switch is opened and closed to generate vibration, the gas density relay can avoid the displacement of the micro switch contact trigger element and the adjusting screw, so that the adjusting screw cannot be blocked or separated from the micro switch contact trigger element, and the reliable operation of the system is ensured. Greatly improves the vibration resistance of the product. Meanwhile, the front end of each micro-switch contact trigger element can be in contact with the adjusting screw to form a rectangular flat plate, the width of the rectangular flat plate is 4.4-8mm, displacement of the micro-switch contact trigger element and the adjusting screw is avoided, the adjusting screw cannot be blocked or separated from the micro-switch contact trigger element, reliable operation of the system is guaranteed, and vibration resistance of a product is further improved.
In addition, the outside parcel of the casing of this density relay can be equipped with the heat preservation, reduces the influence of difference in temperature.
In addition, the following steps can be adopted: the tray is arranged at the rear part of the shell, a vibration-proof pad (such as a spring vibration-proof pad) is arranged between the tray and the shell, the movement can be provided with a damping mechanism, or the movement of the indication display part is an anti-vibration movement (the specific anti-vibration movement comprises a torsion spring), and the density relay shell is internally filled with anti-vibration oil and the like, so that the anti-vibration performance is improved.
The micro switch and the base are respectively positioned at two sides of the signal adjusting mechanism, namely, the micro switch is respectively positioned above the signal adjusting mechanism corresponding to the micro switch; or the micro switch and the base are respectively positioned at one side of the signal adjusting mechanism, namely the micro switch is positioned below the signal adjusting mechanism corresponding to the micro switch.
The high-precision density relay of the technology of the invention can also comprise a holding mechanism after signal action, and can also comprise a holding mechanism and a reset mechanism after signal action.
In summary, it should be appreciated by those skilled in the art that the above embodiments are provided for illustration of the present invention and not for limitation thereof, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims.
Claims (10)
1. High-precision SF (sulfur hexafluoride) 6 The gas density relay comprises a gas density relay shell, a base, an end seat, a Bardon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of micro switches serving as signal generators, wherein the base, the end seat, the Bardon tube, the temperature compensation element and the signal adjusting mechanism are arranged in the shell; one end of the Bardon tube is connected to the base, the other end of the Bardon tube is connected to an end seat, one end of the temperature compensation element is connected to the end seat, and the other end of the temperature compensation element is connected with the signal regulating mechanism; the micro switch is characterized by being a button type micro switch;
the gas density relay further comprises a micro-switch contact trigger element, wherein the micro-switch contact trigger element comprises a shaft and moves along the shaft, one end of the micro-switch trigger element is provided with a fixed shaft, the micro-switch contact trigger element is fixed on the shaft which can flexibly rotate and has very small gap through the fixed shaft, the micro-switch trigger element can move around the fixed shaft relative to the micro-switches, and the other end of the micro-switch trigger element is correspondingly arranged with the buttons of the button type micro-switches and is abutted against the buttons of each micro-switch in a one-to-one correspondence manner; the micro switch is a button type micro switch, and is provided with a button, and a micro switch contact trigger element which moves independently along an axis; the shaft is fixed on the fixing piece, namely the micro-switch contact trigger element is fixed on the fixing piece through the shaft, the shaft is machined, is quite round and well matched, the clearance is quite small, the micro-switch contact trigger element can be prevented from swinging, the fixing piece is fixed in the shell, and the micro-switch contact trigger element is fixed in the shell through the shaft;
When the gas density value changes, the barden tube and the temperature compensation element generate displacement, the displacement drives the micro switch contact trigger element sequentially through the signal adjusting mechanism, and when the gas density value reaches a corresponding set value, the micro switch contact trigger element presses or is far away from a button of the micro switch, so that the micro switch generates a corresponding signal, and the function of the gas density relay is completed.
2. The high precision SF of claim 1 6 The gas density relay is characterized by further comprising a display core, a dial and a pointer, wherein one end of the temperature compensation element is connected with the display core through a display connecting rod or one end of the temperature compensation element is directly connected with the display core, and the pointer is arranged on the display core and in front of the dial.
3. High-precision SF (sulfur hexafluoride) 6 The gas density relay comprises a relatively independent signal control part and an indication display part; the signal control part comprises a control base, a control end seat, a control Bardon tube, a control temperature compensation element, a signal adjusting mechanism and a plurality of microswitches serving as signal generators; one end of the control Bardon tube is connected to the control base, the other end of the control Bardon tube is connected to the control end seat, one end of the control temperature compensation element is connected to the control end seat, and the other end of the control temperature compensation element is connected with the signal adjusting mechanism; the micro switch is characterized by being a button type micro switch;
The gas density relay further comprises a micro-switch contact trigger element, wherein the micro-switch contact trigger element comprises a shaft and moves along the shaft, one end of the micro-switch trigger element is provided with a fixed shaft, the micro-switch contact trigger element is fixed on the shaft which can flexibly rotate and has very small gap through the fixed shaft, the micro-switch trigger element can move around the fixed shaft relative to the micro-switches, and the other end of the micro-switch trigger element is correspondingly arranged with the buttons of the button type micro-switches and is abutted against the buttons of each micro-switch in a one-to-one correspondence manner; the micro switch is a button type micro switch, and is provided with a button, and a micro switch contact trigger element which moves independently along an axis; the shaft is fixed on the fixing piece, namely the micro-switch contact trigger element is fixed on the fixing piece through the shaft, the shaft is machined, is quite round and well matched, the clearance is quite small, the micro-switch contact trigger element can be prevented from swinging, the fixing piece is fixed in the shell, and the micro-switch contact trigger element is fixed in the shell through the shaft;
when the gas density value changes, the barden tube and the temperature compensation element generate displacement, the displacement drives the micro switch contact trigger element through the signal adjusting mechanism in sequence, and when the gas density value reaches a corresponding set value, the micro switch contact trigger element presses or is far away from a button of the micro switch, so that the micro switch generates a corresponding signal, and the function of the gas density relay is completed;
The display value display part comprises a display barden tube, a display temperature compensation element, a display base, a display end seat, a display machine core, a dial and a pointer, wherein one end of the display barden tube is connected to the display base, the other end of the display barden tube is connected to the display end seat, one end of the display temperature compensation element is connected to the display end seat, the other end of the display temperature compensation element is connected with the display machine core through a display connecting rod or the other end of the temperature compensation element is directly connected with the display machine core, and the pointer is installed on the display machine core and is arranged in front of the dial.
4. A high precision SF as claimed in claim 1 or 3 6 The gas density relay is characterized in that: the micro switch contact trigger element is arranged in the shell, and is connected with the micro switch contact trigger element; the micro-switch contact trigger element is characterized by further comprising a limiting piece, wherein the limiting piece limits the signal adjusting mechanism to move in a certain range, and the micro-switch contact trigger element is protected to move in a certain range all the time.
5. A high precision SF as claimed in claim 1 or 3 6 The gas density relay is characterized in that: the signal adjusting mechanism is provided with an adjusting screw; the shape of the micro-switch contact trigger element comprises straight or bent; the relative position of the micro-switch contact trigger element and the micro-switch can be horizontal or provided with inclination; the micro switch is connected with The effective width of the contact part between the front end of the point trigger element and the signal adjusting mechanism is 4.0-18mm.
6. A high precision SF as claimed in claim 1 or 3 6 The gas density relay is characterized in that: the device also comprises a limiting mechanism, when the density relay is vibrated, the limiting mechanism ensures that the signal adjusting mechanism moves in a normal working range;
the vibration-proof density relay further comprises a buffer balance mechanism, wherein the buffer balance mechanism improves the vibration-proof level of the density relay;
the temperature compensation element is a bimetallic strip or a Bardon tube filled with gas;
the signal control part is provided with an anti-misoperation mechanism;
and a limiting mechanism is also adjustably arranged in the shell, and limits the signal adjusting mechanism to a set corresponding position which is larger than the density alarm value.
7. The high precision SF according to claim 1 6 The gas density relay is characterized by further comprising a pressure sensor, a temperature sensor, a signal processing unit and a signal transmission unit, wherein the signal transmission unit is provided with a remote transmission signal, and density on-line monitoring is achieved.
8. A method of improving the accuracy of a gas density relay, comprising: the gas density relay comprises a gas density relay shell, a base, an end seat, a Bardon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of microswitches serving as signal generators, wherein the base, the end seat, the Bardon tube, the temperature compensation element and the signal adjusting mechanism are arranged in the shell; one end of the Bowden tube is connected to the base, the other end of the Bowden tube is connected to an end seat, one end of the temperature compensation element is connected to the end seat, and the other end of the temperature compensation element is connected to the signal adjusting mechanism;
The micro switch is a button type micro switch; the gas density relay further comprises a micro-switch contact trigger element, wherein the micro-switch contact trigger element comprises a shaft and moves along the shaft, one end of the micro-switch trigger element is provided with a fixed shaft, the micro-switch contact trigger element is fixed on the shaft which can flexibly rotate and has very small gap through the fixed shaft, the micro-switch trigger element can move around the fixed shaft relative to the micro-switches, and the other end of the micro-switch trigger element is correspondingly arranged with the buttons of the button type micro-switches and is abutted against the buttons of each micro-switch in a one-to-one correspondence manner; the micro switch is a button type micro switch, and is provided with a button, and a micro switch contact trigger element which moves independently along an axis; the shaft is fixed on the fixing piece, namely the micro-switch contact trigger element is fixed on the fixing piece through the shaft, the shaft is machined, is quite round and well matched, the clearance is quite small, the micro-switch contact trigger element can be prevented from swinging, the fixing piece is fixed in the shell, and the micro-switch contact trigger element is fixed in the shell through the shaft;
When the gas density value changes, the barden tube and the temperature compensation element generate displacement, the displacement drives the micro switch contact trigger element through the signal adjusting mechanism in sequence, and when the gas density value reaches a corresponding set value, the micro switch contact trigger element presses or is far away from a button of the micro switch, so that the micro switch generates a corresponding signal, and the function of the gas density relay is completed;
when the gas density of the electrical equipment is reduced, the baron tube and the temperature compensation element of the gas density relay are displaced, the signal adjusting mechanism is also displaced, and at the moment, the contact trigger element of the micro switch is also displaced, so that the micro switch sends out corresponding signals to a certain extent.
9. The method of claim 8, further comprising an elastic member secured within the housing and disposed in correspondence with the microswitch contact triggering element.
10. The method according to claim 8 or 9, wherein when the signal adjusting mechanism generates displacement, the micro switch contact trigger element generates displacement under the action of the elastic force of the elastic member and/or the elastic force of the micro switch button and/or the thrust of the signal adjusting mechanism, and when the set value is reached, the micro switch generates a corresponding alarm or locking signal.
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| CN201811136564.2A CN109216107B (en) | 2018-09-28 | 2018-09-28 | High-precision SF (sulfur hexafluoride) 6 Gas density relay and implementation method thereof |
| PCT/CN2019/107633 WO2020063606A1 (en) | 2018-09-28 | 2019-09-25 | High-precision sf6 gas density relay and method for implementing same |
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| CN201811136564.2A CN109216107B (en) | 2018-09-28 | 2018-09-28 | High-precision SF (sulfur hexafluoride) 6 Gas density relay and implementation method thereof |
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| CN109216107B (en) * | 2018-09-28 | 2024-03-29 | 上海乐研电气有限公司 | High-precision SF (sulfur hexafluoride) 6 Gas density relay and implementation method thereof |
| CN110429004B (en) * | 2019-09-04 | 2024-03-29 | 上海乐研电气有限公司 | Gas density relay based on ubiquitous power internet of things application |
| CN111781094B (en) * | 2020-08-18 | 2022-12-30 | 云南电网有限责任公司德宏供电局 | Automatic sulfur hexafluoride density relay calibration system |
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| CN109216107B (en) * | 2018-09-28 | 2024-03-29 | 上海乐研电气有限公司 | High-precision SF (sulfur hexafluoride) 6 Gas density relay and implementation method thereof |
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| CN201570439U (en) * | 2009-07-29 | 2010-09-01 | 上海乐研电气科技有限公司 | Vibration resistance pointer type SF6 gas density relay |
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