CN204720384U - A kind of sulfur hexafluoride gas density relay with double compensation element - Google Patents
A kind of sulfur hexafluoride gas density relay with double compensation element Download PDFInfo
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- CN204720384U CN204720384U CN201520212037.0U CN201520212037U CN204720384U CN 204720384 U CN204720384 U CN 204720384U CN 201520212037 U CN201520212037 U CN 201520212037U CN 204720384 U CN204720384 U CN 204720384U
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- gas density
- temperature compensating
- compensating element
- sulfur hexafluoride
- density relay
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- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 64
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 58
- 238000006073 displacement reaction Methods 0.000 claims abstract description 37
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000000977 initiatory effect Effects 0.000 claims abstract description 13
- 230000008844 regulatory mechanism Effects 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000013016 damping Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 description 14
- 230000033001 locomotion Effects 0.000 description 14
- 230000035939 shock Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Abstract
The utility model discloses a kind of sulfur hexafluoride gas density relay with double compensation element, comprise housing, pedestal, end seat, Baden manages, displays temperature compensating element, control temperature compensating element, and some signal generators as gas density relay, one end of described Baden pipe is connected on described pedestal, the other end is connected with one end of control temperature compensating element, by described end seat, described signal generator is arranged on described pedestal or in housing, described gas density relay also comprises an initiating terminal and is connected with the other end of described control temperature compensating element, and amplify end and drive described signal generator to make the displacement amplifying mechanism of contact on signal generator or disconnection, when gas density value changes, Baden's pipe and temperature compensating element produce displacement, this is displaced through after displacement amplifying mechanism amplifies and passes to signal generator, signal generator is made to send corresponding signal, complete the function of density monitor.
Description
Technical field
The utility model relates to a kind of gas density relay, particularly relates to a kind of gas density relay be applied on sulfur hexafluoride electrical equipment, particularly a kind of high-precision gas density relay.
Background technology
Sulphur hexafluoride electric product is widely used in power department, industrial and mining enterprises, facilitates the fast development of power industry.Ensure reliable and secure operation one of vital task becoming power department of sulphur hexafluoride electric product.The arc-extinguishing medium of sulphur hexafluoride electric product and dielectric are sulfur hexafluoride gas, can not leak gas, if leak gas, just can not ensure the reliable and secure operation of sulphur hexafluoride electric product.So the sulfur hexafluoride density value of monitoring sulphur hexafluoride electric product is very necessary.At present, being used for monitoring sulfur hexafluoride gas density generally adopts a kind of pointer sulfur hexafluoride gas density relay (Fig. 1) of machinery to monitor sulfur hexafluoride gas density, namely when gas leakage occurs sulphur hexafluoride electric product, this relay can be reported to the police and locking, simultaneously can also displaying scene density value.This density monitor generally adopts dial 1, pointer 2, single Baden pipe 3, single temperature compensating element 4, pedestal 5, movement 6 and hairspring type magnetic to help formula electric contact 7.This temperature compensating element 4 can only compensate a kind of density value, and in fact, due to the density that sulfur hexafluoride gas is different, its pressure and temp change slope is different, and density is larger, and pressure change greatly.For manufacturer, rated pressure, alarm pressure, locking pressure generally can be taken into account.In other words, be exactly that rated pressure compensates accurate, warning and locking pressure then certainly exist error.So for the density monitor of single temperature compensating element, manufacturer can take into account the composition error of rated pressure, alarm pressure, locking pressure, carrys out selective temperature compensating element.So, for this kind of density monitor, just certainly there is compensating error, its precision is just difficult to reach very high.In addition, due to this SF
6the temperature compensating element that gas density relay adopts only has one, and its width only has 5mm, insufficient strength, when the judder of switch breaking-closing operating, be easy to cause adjusting rod to misplace, and adjusting rod is blocked or departs from the phenomenon of sensitive switch motion arm, system reliably working can not be ensured.Be necessary a kind of not oil-filled and good pointer SF of resistance to shock of exploitation
6gas density relay, to ensure system reliably working.
Because above-mentioned hairspring type magnetic helps formula electric contact to there is the insecure shortcoming of contact, those skilled in the art develop again another kind of contact be sensitive switch without oil type sulfur hexafluoride gas density relay, the structure of this sulfur hexafluoride gas density relay is according to Fig. 2 and Fig. 3, it comprises dial 1, pointer 2, Baden's pipe 3, temperature compensating element 4, pedestal 5, with the movement 6 of display enlarger, connecting rod 7, housing 8, joint 9, sensitive switch 101, 102, 103, regulating part 111, 112, 113, linking arm 12, contact motion arm 13, end seat 14, junction block 15, watch crystal 16, case 17, printed circuit board 18, location-plate 19, fixed head 20, electric wire 21 and sulfur hexafluoride gas feed tube 22, wherein, joint 9, junction block 15, watch crystal 16, case 17 and pedestal 5 are separately fixed on housing 8.Movement 6 and fixed head 20 are arranged on pedestal 5 respectively, and pointer 2 and dial 1 are separately fixed on movement 6.One end of Baden's pipe 3 is welded on pedestal 5, the other end is connected with one end of temperature compensating element 4 by end seat 14, the other end of temperature compensating element 4 is connected with linking arm 12, and one end of linking arm 12 is connected with one end of connecting rod 7, and the other end of connecting rod 7 is connected with movement 6.Contact motion arm 13 is the extension of linking arm 12, contact motion arm 13 is fixed with regulating part 111,112,113.Sensitive switch 101,102,103 is welded on printed circuit board 18 respectively, and printed circuit board 18 is arranged on fixed head 20, and fixed head 20 is arranged on again on pedestal 5.Sensitive switch 101 is fixed on the below of regulating part 111, and sensitive switch 102 is fixed on the below of regulating part 112, and sensitive switch 103 is fixed on the below of regulating part 113.Each sensitive switch is respectively equipped with operating grip 1011,1021,1031.Location-plate 19 rear end is fixed on movement 6, and front end extends to below the end seat 14 of one end that Baden's pipe 3 is connected with temperature compensating element 4.The function of location-plate 19 is: when sulfur hexafluoride gas density drops to certain value, and restriction Baden pipe 3 moves down, protection sensitive switch, and then protection contact motion arm 12 is not out of shape by damaging by pressure, makes whole system keep reliably working.
The contact of sensitive switch 101,102,103 is connected to junction block 15 by electric wire 21 from printed circuit board 18, and junction block 15 is fixed on housing 8.Watch crystal 16, case 17 are separately fixed on housing 8, and its internal mechanism can be protected to invade from mechanical damage and dirt, rainwater.One end of sulfur hexafluoride gas feed tube 22 is connected with pedestal 5, and positiver sealing, the other end of sulfur hexafluoride gas feed tube 22 is connected with joint 9, and positiver sealing.
Although the sensitive switch that above-mentioned sulfur hexafluoride gas density relay adopts has the advantage of good electric property, because Baden's pipe 3 is along with the change of gas pressure, its pipe end can be subjected to displacement, but its displacement is less; And temperature compensating element 4 is also subjected to displacement along with the change of temperature, but its displacement is also corresponding less; Therefore, when gas density value changes, Baden's pipe 3 and temperature compensating element 4 will produce displacement, and displacement is all less.The displacement of Baden's pipe 3 and temperature compensating element 4 drives pointer 2 to be presented on dial 1 by the display enlarger on movement 6 again.Equally, this temperature compensating element 4 can only compensate a kind of density value, and due to the density that sulfur hexafluoride gas is different, its pressure and temp change slope is different, and density is larger, and pressure change greatly.For manufacturer too, generally can take into account rated pressure, alarm pressure, locking pressure.In other words, be exactly that rated pressure compensates accurate, warning and locking pressure then certainly exist error.So for the density monitor of this kind of single temperature compensating element, manufacturer can take into account the composition error of rated pressure, alarm pressure, locking pressure, carrys out selective temperature compensating element.So, for this density monitor, just certainly there is compensating error, its precision is just difficult to reach very high.Therefore, make gas density relay not realize high accuracy, and resistance to shock is poor, is difficult to guarantee system reliably working.
In sum, the precision of current sulfur hexafluoride gas density relay is not high, be difficult to meet the demands.
Summary of the invention
In order to solve the problems referred to above that prior art exists, the object of the present invention is to provide the sulfur hexafluoride gas density relay that a kind of precision is high, resistance to shock is high, for the density of sulfur hexafluoride gas or its mist in control & monitor airtight container, and for the Leakage Gas situation occurred in sulfur hexafluoride electrical equipment, send alarm signal and block signal in time, for ensureing that electric power safety plays a role.
Realizing a kind of technical scheme of above-mentioned purpose is: a kind of sulfur hexafluoride gas density relay with double compensation element, comprise housing, be arranged on the relatively independent signal control portion in housing and indicating value display section, described signal control portion and indicating value display section are respectively with a control temperature compensating element, and displays temperature compensating element, described signal control portion comprises pedestal, Baden manages, end seat, control temperature compensating element, Signal Regulation mechanism, command displacement enlarger, signal generator, one end of described Baden pipe is connected on described pedestal, the other end is connected with one end of described control temperature compensating element, by described end seat, the initiating terminal of described command displacement enlarger is connected with the other end of described control temperature compensating element, and amplification end drives described signal generator by described Signal Regulation mechanism, make contact or the disconnection of described signal generator.
The sulfur hexafluoride gas density relay of described band double compensation element, described indicating value display section comprises described displays temperature compensating element, display enlarger and pointer, one end of described displays temperature compensating element, is connected with described end seat, the other end is connected with the initiating terminal of described display enlarger, and described pointer is connected with the amplification end of described display enlarger.
Described sulfur hexafluoride gas density relay, described signal generator is that sensitive switch or magnetic help formula electric contact.
Described sulfur hexafluoride gas density relay, described sensitive switch to be arranged in described housing and with contact operating grip, the initiating terminal of described command displacement enlarger is connected with the other end of described control temperature compensating element, and amplify the contact operating grip that end drives described sensitive switch, make the contact on described sensitive switch or disconnection; Described Signal Regulation mechanism is corresponding with the contact operating grip on described sensitive switch to be arranged.
Described sulfur hexafluoride gas density relay, the initiating terminal of described command displacement enlarger is fixedly connected with the other end of described control temperature compensating element, with linking arm by connecting rod, amplifies contact or the disconnection of holding and being driven described sensitive switch by Signal Regulation mechanism.
Described sulfur hexafluoride gas density relay, described magnetic helps formula electric contact to be arranged in described housing, the initiating terminal of described command displacement enlarger is connected with the other end of described control temperature compensating element, and amplification end drives described magnetic to help formula electric contact, described magnetic is made to help contact or the disconnection of formula electric contact.
Described sulfur hexafluoride gas density relay, the amplification end of described command displacement enlarger drives described magnetic to help formula electric contact by Signal Regulation mechanism, and makes described magnetic help contact or the disconnection of formula electric contact.
Described sulfur hexafluoride gas density relay, be also provided with the switch actuating mechanism for regulating described sensitive switch position on described pedestal or in housing, described sensitive switch is fixed in described housing by this switch actuating mechanism.
Described sulfur hexafluoride gas density relay, described displacement amplifying mechanism is gear drive, lever drive or fan-shaped curved surface transmission mechanism.
Described sulfur hexafluoride gas density relay, described control or display displacement amplifying mechanism are all with damping mechanism.
Sulfur hexafluoride gas density relay of the present invention, owing to have employed above technical scheme, makes it compared with prior art, has following obvious advantage and disadvantage:
First two temperature compensating element, is utilized to revise the pressure and temperature of change better, can accurate response SF
6the change of gas density, makes show value more accurate, makes contact operating value (reporting to the police and locking value) also more accurate.Simultaneously owing to adopting the displacement of Baden's pipe and control temperature compensating element, through displacement amplifying mechanism this displacement equations, then remove control signal generator (some sensitive switches or magnetic help formula electric contact).This displacement amplifying mechanism is according to the size control signal generator (sensitive switch or magnetic help formula electric contact) of gas density value, signal generator is made to send corresponding signal, complete the function of density monitor, thus the enlarger overcoming prior art only has the defect of the function of display amplification, gas density relay is had advantages such as precision is high, resistance to shock is high, long working life, ensure that system reliably working, be a kind of sulfur hexafluoride gas density relay of genuine performance brilliance, can be applied on sulfur hexafluoride electrical equipment well.In addition, sulfur hexafluoride gas density relay of the present utility model can also be sulfur hexafluoride gas mixture density monitor or Compressed Gas density monitor.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of prior art pointer sulfur hexafluoride gas density relay;
Fig. 2 is the another kind of structural representation of prior art pointer sulfur hexafluoride gas density relay;
Fig. 3 is the partial side view of Fig. 2;
Fig. 4 is a kind of structural representation of sulfur hexafluoride gas density relay of the present invention.
Embodiment
In order to understand technical scheme of the present invention better, also by reference to the accompanying drawings the present invention is described in detail below by specific embodiment:
Refer to Fig. 4, a kind of sulfur hexafluoride gas density relay of the present invention, comprise relatively independent signal control portion and Signal aspects part, wherein:
Signal control portion comprises Baden's pipe 3, control temperature compensating element, 4A(present case adopts bimetallic material), pedestal 5, end seat 14, Signal Regulation mechanism 111, 112, 113, with contact operating grip 1011, 1021, the sensitive switch 101 of 1031, 102, 103 and displacement amplifying mechanism 6A, one end of Baden's pipe 3 is connected on pedestal 5, and the other end is connected on end seat 14, and this end seat 14 is connected with one end of control temperature compensating element, 4A, sensitive switch 101, 102, 103 are arranged on pedestal 5 or in housing 8, and the initiating terminal of displacement amplifying mechanism 6A is connected with the other end of control temperature compensating element, 4A with linking arm 13A by connecting rod 7A, Signal Regulation mechanism 111, 112, 113 are arranged on the amplification end of sun gear shaft 62A and displacement amplifying mechanism 6A, three sensitive switches 101, 102, 103 and Signal Regulation mechanism 111, 112, 113 corresponding pairs are arranged, and three sensitive switches 101, 102, 103 respectively with contact operating grip 1011, 1021, 1031, displacement amplifying mechanism 6A is by control signal governor motion 111,112,113 action after the displacement equations of Baden's pipe 3 and control temperature compensating element, 4A, make Signal Regulation mechanism 111,112,113 control the action of sensitive switch 101,102,103 contact operating grip 1011,1021,1031, realize the high accuracy of density monitor,
Signal aspects part comprises Baden's pipe 3, displays temperature compensating element, 4B(present case also adopts bimetallic material), display enlarger 6B(present case adopts movement), pedestal 5, end seat 14 and pointer 2, this end seat 14 is connected with one end of displays temperature compensating element, 4B, and the initiating terminal showing enlarger 6B is connected with the other end of displays temperature compensating element, 4B with linking arm 13B by connecting rod 7B; Pointer 2 is arranged on display machines mandrel 60B.
Control enlarger 6A and the display enlarger 6B of the present embodiment can be splits, also can be integrated.
The sulfur hexafluoride gas density relay of the present embodiment utilizes control temperature compensating element, 4A and displays temperature compensating element, 4B, revises, can react the change of sulfur hexafluoride gas density to the pressure and temperature of change.Such as, Baden's pipe 3 is flexible members, utilizes the pressure and temperature of displays temperature compensating element, 4B to change to revise, the change of reaction sulfur hexafluoride gas density.Namely under the pressure effect of measured medium sulfur hexafluoride gas, owing to there being the effect of displays temperature compensating element, 4B, the change of its density value, force value also changes accordingly, the end of Baden's pipe 3 is forced to produce corresponding strain and be subjected to displacement, by means of displays temperature compensating element, 4B, pass to display enlarger 6B by connecting rod 7B, by the pointer 2 be arranged on the amplification end (display machines mandrel 60B) of display enlarger 6B, tested sulfur hexafluoride gas density value is presented on dial.
In sum, owing to adopting two temperature compensating element, just can distinguish selective temperature compensating element, according to the density of the density of show value and contact operating value, thus can improve the compensation precision of density monitor; Same in the sulfur hexafluoride gas density relay of the present embodiment, control section and display section are relatively independent, it has the following advantages: can accomplish actual act value and pointer show value just the same, and traditional pointer type density relay, owing to there is switch resistance and magnetic helps formula power, always there is certain deviation in its actual operating value and pointer show value, makes troubles to user.Also have owing to adopting two temperature compensating element, the support force of Baden's pipe just can be made to be strengthened, and then greatly improve the resistance to shock of this density monitor.
In sum, sulfur hexafluoride gas density relay of the present invention was all controlled by amplification by displacement amplifying mechanism afterwards owing to adopting the control of two temperature compensating element, signal generator (sensitive switch or magnetic help formula electric contact), so temperature-compensating performance is more accurate, resistance to shock is high, precision is high.
Those of ordinary skill in the art will be appreciated that, it is of the present invention that above embodiment is only used to explanation, and be not used as restriction of the present utility model, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (10)
1. the sulfur hexafluoride gas density relay with double compensation element, comprise housing, be arranged on the relatively independent signal control portion in housing and indicating value display section, it is characterized in that: described signal control portion and indicating value display section are respectively with a control temperature compensating element, and displays temperature compensating element, described signal control portion comprises pedestal, Baden manages, end seat, control temperature compensating element, Signal Regulation mechanism, command displacement enlarger, signal generator, one end of described Baden pipe is connected on described pedestal, the other end is connected with one end of described control temperature compensating element, by described end seat, the initiating terminal of described command displacement enlarger is connected with the other end of described control temperature compensating element, and amplification end drives described signal generator by described Signal Regulation mechanism, make contact or the disconnection of described signal generator.
2. the sulfur hexafluoride gas density relay of band double compensation element according to claim 1, it is characterized in that, described indicating value display section comprises described displays temperature compensating element, display enlarger and pointer, one end of described displays temperature compensating element, is connected with described end seat, the other end is connected with the initiating terminal of described display enlarger, and described pointer is connected with the amplification end of described display enlarger.
3. sulfur hexafluoride gas density relay according to claim 1, is characterized in that: described signal generator is that sensitive switch or magnetic help formula electric contact.
4. sulfur hexafluoride gas density relay according to claim 3, it is characterized in that: described sensitive switch to be arranged in described housing and with contact operating grip, the initiating terminal of described command displacement enlarger is connected with the other end of described control temperature compensating element, and amplify the contact operating grip that end drives described sensitive switch, make the contact on described sensitive switch or disconnection; Described Signal Regulation mechanism is corresponding with the contact operating grip on described sensitive switch to be arranged.
5. the sulfur hexafluoride gas density relay according to claim 1,3 or 4, is characterized in that: the initiating terminal of described command displacement enlarger is fixedly connected with the other end of described control temperature compensating element, with linking arm by connecting rod, amplifies contact or the disconnection of holding and being driven sensitive switch by Signal Regulation mechanism.
6. sulfur hexafluoride gas density relay according to claim 3, it is characterized in that: described magnetic helps formula electric contact to be arranged in described housing, the initiating terminal of described command displacement enlarger is connected with the other end of described control temperature compensating element, and amplification end drives described magnetic to help formula electric contact, described magnetic is made to help contact or the disconnection of formula electric contact.
7. sulfur hexafluoride gas density relay according to claim 6, it is characterized in that: the amplification end of described command displacement enlarger drives described magnetic to help formula electric contact by Signal Regulation mechanism, and make described magnetic help contact or the disconnection of formula electric contact.
8. sulfur hexafluoride gas density relay according to claim 4, it is characterized in that: be also provided with the switch actuating mechanism for regulating described sensitive switch position on described pedestal or in housing, described sensitive switch is fixed in described housing by this switch actuating mechanism.
9. sulfur hexafluoride gas density relay according to claim 1, is characterized in that: described displacement amplifying mechanism is gear drive, lever drive or fan-shaped curved surface transmission mechanism.
10. sulfur hexafluoride gas density relay according to claim 1 and 2, is characterized in that: described control or display displacement amplifying mechanism are all with damping mechanism.
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| CN201520212037.0U CN204720384U (en) | 2015-04-10 | 2015-04-10 | A kind of sulfur hexafluoride gas density relay with double compensation element |
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| CN201520212037.0U CN204720384U (en) | 2015-04-10 | 2015-04-10 | A kind of sulfur hexafluoride gas density relay with double compensation element |
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| CN107863268A (en) * | 2017-11-29 | 2018-03-30 | 上海乐研电气有限公司 | A kind of gas density relay superpressure signal realizes the method kept |
| CN108493048A (en) * | 2018-04-09 | 2018-09-04 | 国网安徽省电力有限公司检修分公司 | A kind of antivibration formula sulfur hexafluoride gas density relay |
| CN109243914A (en) * | 2018-09-28 | 2019-01-18 | 上海乐研电气有限公司 | A kind of method and high-precision gas density monitor improving gas density relay precision |
| CN110277275A (en) * | 2019-07-04 | 2019-09-24 | 上海新远仪表厂有限公司 | The SF6 gas density is that temperature-compensating can be carried out to multiple and different density values switchs |
| CN110429002A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | A kind of gas density relay of insulation performance self-test |
| CN110429004A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | A kind of gas density relay based on the application of ubiquitous electric power Internet of Things |
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- 2015-04-10 CN CN201520212037.0U patent/CN204720384U/en active Active
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| CN109904033B (en) * | 2017-11-29 | 2021-02-09 | 上海乐研电气有限公司 | Method for realizing holding of overpressure signal of gas density relay |
| CN107799356B (en) * | 2017-11-29 | 2020-11-06 | 上海乐研电气有限公司 | Electric contact pressure gauge with contact action keeping function |
| CN109904033A (en) * | 2017-11-29 | 2019-06-18 | 上海乐研电气有限公司 | A kind of method that gas density relay superpressure signal realizes holding |
| CN107799356A (en) * | 2017-11-29 | 2018-03-13 | 上海乐研电气有限公司 | A kind of electro connecting pressure gauge kept with contact action |
| CN107863268A (en) * | 2017-11-29 | 2018-03-30 | 上海乐研电气有限公司 | A kind of gas density relay superpressure signal realizes the method kept |
| CN108493048A (en) * | 2018-04-09 | 2018-09-04 | 国网安徽省电力有限公司检修分公司 | A kind of antivibration formula sulfur hexafluoride gas density relay |
| CN108493048B (en) * | 2018-04-09 | 2024-04-09 | 国网安徽省电力有限公司超高压分公司 | Vibration-resistant sulfur hexafluoride gas density relay |
| CN109243914A (en) * | 2018-09-28 | 2019-01-18 | 上海乐研电气有限公司 | A kind of method and high-precision gas density monitor improving gas density relay precision |
| CN109243914B (en) * | 2018-09-28 | 2024-03-29 | 上海乐研电气有限公司 | Method for improving accuracy of gas density relay and gas density relay |
| CN110277275A (en) * | 2019-07-04 | 2019-09-24 | 上海新远仪表厂有限公司 | The SF6 gas density is that temperature-compensating can be carried out to multiple and different density values switchs |
| CN110277275B (en) * | 2019-07-04 | 2024-03-29 | 上海新远仪表厂有限公司 | SF6 gas density switch capable of temperature compensating multiple different density values |
| CN110429002A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | A kind of gas density relay of insulation performance self-test |
| CN110429004A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | A kind of gas density relay based on the application of ubiquitous electric power Internet of Things |
| CN110429002B (en) * | 2019-09-04 | 2023-09-22 | 上海乐研电气有限公司 | Gas density relay with insulating property self-test function |
| 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 |
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