CN104460480A - Sulfur hexafluoride gas density moisture online monitoring system - Google Patents
Sulfur hexafluoride gas density moisture online monitoring system Download PDFInfo
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- CN104460480A CN104460480A CN201410643859.4A CN201410643859A CN104460480A CN 104460480 A CN104460480 A CN 104460480A CN 201410643859 A CN201410643859 A CN 201410643859A CN 104460480 A CN104460480 A CN 104460480A
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- sulfur hexafluoride
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
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Abstract
The invention relates to a sulfur hexafluoride gas density moisture online monitoring system. The sulfur hexafluoride gas density moisture online monitoring system is characterized by comprising at least one sulfur hexafluoride gas density moisture transmitter and at least one teletransmission type sulfur hexafluoride gas density relay, wherein all the sulfur hexafluoride gas density moisture transmitters and all the teletransmission type sulfur hexafluoride gas density relays are connected with a remote background detection system sequentially through concentrators and an IEC61850 protocol converter. According to the sulfur hexafluoride gas density moisture online monitoring system, sulfur hexafluoride gas density values and moisture contents can be remotely transmitted to the remote background detection system through the 485 concentrators and the IEC61850 protocol converter, the SF6 gas density and SF6 gas moisture of SF6 electrical equipment can be monitored online, and therefore online monitoring and fault diagnosis can be conducted on the SF6 electrical equipment, and when the SF6 electrical equipment leaks gas, warning and locking can be conducted in time.
Description
Technical field
The present invention relates to the micro-water on-line monitoring system of a kind of sulfur hexafluoride gas density.
Background technology
Sulfur 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 sulfur hexafluoride electric product.The arc-extinguishing medium of sulfur hexafluoride electric product and insulating medium are sulfur hexafluoride gas, can not leak gas, if leak gas, just can not ensure the reliable and secure operation of sulfur hexafluoride electric product.So the sulfur hexafluoride density value of monitoring sulfur 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 of machinery to monitor sulfur hexafluoride gas density, namely when gas leakage occurs sulfur hexafluoride electric product, this relay can be reported to the police and locking, simultaneously can also displaying scene density value.Most importantly, be used at present monitoring SF simultaneously
6the SF of this kind of machinery of gas density
6gas density relay monitors SF
6, also there is following outstanding defect: 1) SF in gas density
6when gas leakage occurs electric product, only have when its gaseous tension drops to alarming value, just send alerting signal, and now SF
6gas have leaked a lot.Such as rated pressure is the SF of 0.6Mpa
6electrical equipment generally adopts alarm pressure to be the density monitor of 0.52Mpa, locking pressure 0.50Mpa.A lot of transformer station is all unattended operation transformer station now, like this for this SF
6electrical equipment, if leaked gas, when its gas drops to alarm pressure 0.52Mpa from rated pressure 0.6Mpa, operator on duty has just found, just notifies that maintainer removes site disposal leakage accident, and now SF
6gas have leaked a lot.So at unattended operation transformer station, be starved of on-line monitoring SF
6the density of electrical equipment, Timeliness coverage SF
6the Leakage Gas of electrical equipment.2) this density monitor contact generally adopts hairspring type magnetic to help formula electric contact.During its closing of contact, its closing force is very little, and contact is closed firm not.And the most important thing is when being oxidized or pollute, the normal phenomenon that electric contact loose contact occurs, causes inefficacy, produces serious consequence.
Well-known in addition, SF
6the effect of gas in high voltage electric equipment is arc extinguishing and insulation, SF in high voltage electric equipment
6if the micro-water content of gas exceeds standard and density reduces and will have a strong impact on SF
6the safe operation of high voltage electric equipment: 1) in the presence of some metal objects, SF
6gas high temperature more than 200 DEG C temperature can with water generation hydrolysis reaction, generate active HF and SOF2, etching insulative part and metalwork, and produce amount of heat, air chamber pressure is raised.2) when temperature reduces, too much moisture content may form condensation water, and insulating part surface insulation intensity is significantly reduced, and even flashover, causes serious harm.3) SF
6gas density is reduced to and to a certain degree will causes the forfeiture of insulation and arc extinction performance.Therefore grid operation codes mandatory provision, before putting equipment in service and run in all must to SF
6the bulk density and water content of gas carries out periodic detection.
For micro-water monitoring, off-line method is generally adopted to measure micro-water content at present: the portable dew point hygrometer of main employing carries out Site Detection, and it exists following defect:
(1) non real-time.Current power department adopts for general one year 2 times dew point hygrometer to detect SF
6the SF of electrical equipment
6gas micro water content, this is a kind of non real-time detection method, and it can not reflect the variation tendency that equipment runs, also cannot to SF
6the variation tendency of gas micro water content is predicted, the operation conditions of electrical equipment cannot be grasped, can not prevent in time and get rid of potential safety hazard, cannot by intelligent equipment repair based on condition of component standard, accurate evaluation, judgment device situation, be difficult to the repair based on condition of component realizing electrical equipment.
(2) measurement limits by environment temperature.The operating ambient temperature of dew point hygrometer is-10 DEG C ~+50 DEG C.Meanwhile, different environment temperatures, its measurement range is different, the winter in the north and southern summer discomfort be fit to do on-the-spot SF
6gas micro water content is tested.Owing to being subject to the impact of weather and environment temperature, the data of detection only can reference.
(3) time-consuming, bothersome, take gas.Adopt during dew point hygrometer test and need discharge SF for a long time
6gas, this is that before during measurement, 3-5 minute needs dry up sampling line because sampling line is containing wetly; In order to can SF be tested
6the SF of inside electric appliance
6gas micro water content, just needs a certain amount of SF
6out, the test of a usual complete and accurate about needs about 10 ~ 15 minutes to gas discharging.By standard sample gas flow, namely 30 ~ 40L/h calculates, and once test needs to discharge SF
6gas about 8 liters.So, after completing test several times, supplementary SF is just needed
6gas.In addition, also there is potential safety hazard in testing staff's operation lack of standardization.
(4) high testing cost.Electric company has been the SF that testing need be equipped with reviewer, equipment, vehicle and high value
6gas.Rough calculation, the testing cost of sharing every year of each transformer station about tens thousand of to about tens0000 yuan.
(5) field personnel is endangered healthy, atmosphere pollution.SF
6gas certainly as nontoxic gas, but can generate some toxic and harmfuls after pyroreaction, has great harm to the person.And SF
6gas is a kind of greenhouse gases, and international regulations directly can not enter air.
In order to ensure SF
6the reliability service of electrical equipment, improves the continuous reliability service ability of electric system, realizes presence and detects, monitors and failure prediction, become SF to its performance
6important research direction in electrical equipment application.Along with unattended operation transformer station is to the requirement of remote control, remote measurement, on-line monitoring SF
6the SF of electrical equipment
6gas density value and micro-water content have very important practical significance.
Along with unattended operation transformer station is constantly strengthened, so to SF to networking, digitizing future development and the requirement to remote control, remote measurement
6the SF of electrical equipment
6the on-line monitoring of gas density and micro-water content state has important practical significance.
Summary of the invention
The object of this invention is to provide the micro-water on-line monitoring system of a kind of sulfur hexafluoride gas density, can on-line monitoring SF
6the SF of electrical equipment
6gas density and SF
6the micro-water of gas, thus to SF
6electrical equipment is made reliably, on-line monitoring and fault diagnosis accurately.
The micro-water on-line monitoring system of a kind of sulfur hexafluoride gas density, its special feature is: comprise the micro-water transmitter of at least one sulfur hexafluoride gas density, and at least one telemetering type sulfur hexafluoride gas density relay, this all sulfur hexafluoride gas density micro-water transmitter is connected with long-range rear station detecting system by hub, IEC61850 protocol converter all successively with telemetering type sulfur hexafluoride gas density relay.
Wherein hub adopts RS485 hub, and IEC61850 protocol converter is also connected with network service printer and network data router respectively.
Wherein telemetering type sulfur hexafluoride gas density relay comprises housing, this hull outside is installed with junction block and joint respectively, at this housing internal fixtion, pedestal is installed, also comprise Bourdon tube, one end of this Bourdon tube is fixed on described pedestal that its other end is connected with one end of temperature compensation sheet, the input end that the other end of this temperature compensation sheet reduces mechanism by web member and displacement is connected, the output terminal that mechanism is reduced in this displacement is connected with pointer, is also installed with index dial in addition on pedestal.
Wherein Bourdon tube adopts C type Bourdon tube, and web member adopts connecting link.
Its center tap is communicated with pressure transducer with the temperature sensor on pedestal by pipeline.
Wherein temperature sensor is connected with electric current galvanostat by amplifying circuit, single-chip microcomputer, digital analog converter, voltage current adapter successively with the output terminal of pressure transducer, the output terminal of this electric current galvanostat is also connected with junction block, thus converts the output of 4-20mA current signal after converting the pressure and temperature signal collected to density value again to;
Or wherein temperature sensor is connected with junction block respectively with the output terminal of pressure transducer, thus the pressure and temperature signal collected directly is exported.
Wherein on housing, by O-ring seal, watch glass is installed, watch glass is also provided with case.
Wherein displacement is reduced mechanism and is adopted fan-shaped curved surface gear train, it specifically comprises train wheel bridge and lower plate, be separately installed with the fan-shaped curved surface gear and central gear that are meshed by rotating shaft between this train wheel bridge and lower plate, this fan-shaped curved surface gear reduces the input end of mechanism as displacement, and the rotating shaft of this central gear reduces the output terminal of mechanism as displacement.
Wherein the radius of the radius ratio central gear of fan-shaped curved surface gear is little.
Wherein in described housing, be also provided with signal generator, this signal generator comprises at least one microswitch be fixed on pedestal, and the Signal Regulation mechanism coordinated with this microswitch is installed in the rotating shaft of central gear, thus can trigger microswitch when the rotating shaft of this central gear rotates to certain angle, and all microswitches are all connected with junction block.
The wherein eccentric wheel equal with microswitch quantity specifically installed in the rotating shaft of central gear of Signal Regulation mechanism.
Wherein the micro-water transmitter of sulfur hexafluoride gas density comprises housing, on the housing jointing is installed and the rear end of this jointing stretches in housing, the rear end of the jointing in this housing is separately installed with pressure transducer, temperature sensor and micro-water sensor, this pressure transducer, temperature sensor are connected with signal processing circuit with micro-water sensor, thus can export the current signal corresponding with micro-water content to the sulfur hexafluoride gas density value detected.
Wherein current signal is 4-20mA.
Its middle shell forms by three layers, and wherein internal layer adopts stainless steel material, and middle layer adopts thermal insulation material, outer employing stainless steel material.
Wherein thermal insulation material is pottery, plastics or sponge.
Wherein signal processing circuit comprises the amplifying circuit, single-chip microcomputer, digital analog converter, voltage current adapter and the electric current galvanostat that connect successively.
The rear end of the jointing wherein in housing is provided with printed circuit board (PCB), and described signal processing circuit is located on this printed circuit board (PCB).
The invention provides the micro-water on-line monitoring system of a kind of sulfur hexafluoride gas density, comprise some apparatus body connectors of high voltage electric equipment, some telemetering type density monitors, some micro-water transmitters, some 485 hubs, IEC61850 protocol converter, long-range rear station detecting system, printing device.This density micro-water on-line monitoring system gathers sulfur hexafluoride gas density, micro-water signal by telemetering type density monitor, micro-water transmitter, sulfur hexafluoride gas density value and micro-water content can be realized long-distance transmissions to station detecting system after long-range through 485 hubs and IEC61850 protocol converter, can on-line monitoring SF
6the SF of electrical equipment
6gas density and SF
6the micro-water of gas, thus can to SF
6online monitoring and fault diagnosis made by electrical equipment, can Real time displaying SF
6the SF of electrical equipment
6gas density, works as SF
6when there is gas leakage in electrical equipment can and alarm and locking; Can Real time displaying SF
6inside electric appliance SF
6the micro-water of gas, works as SF
6the SF of electrical equipment
6during gas excessive water content can and alarm.Whether that exist burst and small leakage if utilizing standardized calculation of pressure to detect, and online dew point measurement warns moisture state at any time for operating personnel, guarantee electric power netting safe running.
Accompanying drawing explanation
Accompanying drawing 1 is logic theory block diagram of the present invention;
Accompanying drawing 2 is the structural representation of prior art middle finger pin type sulfur hexafluoride gas density relay;
Accompanying drawing 3 is the structural representation of gas density relay in the present invention;
Accompanying drawing 4 is the partial structurtes schematic diagram of gas density relay in the present invention;
Accompanying drawing 5 is that in the present invention, in gas density relay, the structural representation of mechanism 7 part is reduced in displacement;
Accompanying drawing 6 is the circuit theory diagrams of gas density relay in the present invention.
Accompanying drawing 7 is the structural representation of the micro-water transmitter of gas density in the present invention;
Accompanying drawing 8 is the circuit theory diagrams of the micro-water transmitter of gas density in the present invention.
Embodiment
As shown in Fig. 1,3,4,5,6,7,8, the invention provides the micro-water on-line monitoring system of a kind of sulfur hexafluoride gas density, comprise the micro-water transmitter of at least one sulfur hexafluoride gas density, and at least one telemetering type sulfur hexafluoride gas density relay, this all sulfur hexafluoride gas density micro-water transmitter is connected with long-range rear station detecting system by hub, IEC61850 protocol converter all successively with telemetering type sulfur hexafluoride gas density relay.Wherein hub adopts RS485 hub, and IEC61850 protocol converter is also connected with network service printer and network data router respectively.
Refer to Fig. 1, the invention provides the micro-water on-line monitoring system of a kind of sulfur hexafluoride gas density, comprise some apparatus body connectors of high voltage electric equipment, some telemetering type density monitor RDM, some micro-water transmitter RDT, some 485 hubs, IEC61850 protocol converter, long-range rear station detecting system, printing device.Wherein some telemetering type density monitor RDM sealings are fixed on some apparatus body connectors, and its sealing means adopts copper sheet firmly to seal the mode combined with the seal with elastometic washer of O type.Some micro-water transmitter RDT sealings are fixed on some apparatus body connectors, its sealing means also adopts copper sheet firmly to seal the mode combined with the seal with elastometic washer of O type, object guarantees sealing, prevent the moisture of outside air from entering around micro-water transmitter RDT, improve the validity measured and accuracy further.
The SF6 gas density of the present invention's development and the on-line monitoring system of micro-water; by this SF6 gas density and micro-water on-line monitoring system; energy is real-time the SF6 plenum interior density value of deblocking and the change of moisture; grasp the state of SF6 gas; can prevent in time and get rid of potential safety hazard accident; protection power equipment and the safety of staff, ensure the normal operation of power-supply unit, meets the continual and steady of enterprise and household electricity.The know-why of on-line monitoring system is as follows: the SF6 gas density developed and micro-water on-line monitoring system, the telemetering type sulfur hexafluoride gas density relay of, contact good electric property good primarily of anti-seismic performance, micro-water transmitter not influenced by ambient temperature, and the formation such as 485 hubs, IEC61850 protocol converter, long-range rear station detecting system, printing device.485 hubs are by the collection to telemetering type density monitor RDM, micro-water transmitter RDT, density, micro-water content are transferred to long-range rear station detecting system by IEC61850 protocol converter, the computer digital animation of station detecting system after long-range, can provide testing result in real time, long-range rear station detecting system also has display, performs and communication function.
On-line monitoring system of the present invention can also directly show dew point value (micro-water content), density value, temperature value on the spot by display, simultaneously, be linked in the long-range rear station detecting system of transformer station by data communication methods such as RS-485 hubs, so that network with Comprehensive Automatic System for Substation, and teletransmission is to unattended station central monitoring station, central monitoring station that is local in transformer station and a distant place carries out Real-Time Monitoring, achieves SF
6sF in electrical equipment
6the on-line monitoring of gas density and micro-water.
1, telemetering type sulfur hexafluoride gas density relay:
As Fig. 3, 4, 5, shown in 6, a kind of telemetering type sulfur hexafluoride gas density relay is provided in the present invention, comprise housing 8, junction block 15 and joint 9 is installed with respectively on outside this housing 8, at this housing 8 internal fixtion, pedestal 5 is installed, also comprise Bourdon tube 3, one end of this Bourdon tube 3 is fixed on described pedestal 5 that its other end is connected with one end of temperature compensation sheet 4, the input end that the other end of this temperature compensation sheet 4 reduces mechanism 7 by web member and displacement is connected, the output terminal that mechanism 7 is reduced in this displacement is connected with pointer 2, index dial 1 is also installed with in addition on pedestal 5.
Wherein Bourdon tube 3 adopts C type Bourdon tube, and web member adopts connecting link 6.Wherein (sulfur hexafluoride gas) joint 9 is communicated with the temperature sensor 20 on pedestal 5 (pressure transducer 21 directly contacts with sulfur hexafluoride gas, and temperature sensor 20 directly can contact with sulfur hexafluoride gas or can not directly contact) by pipeline.Wherein temperature sensor 20 is connected with electric current galvanostat with voltage current adapter by amplifying circuit, single-chip microcomputer 23, digital analog converter successively with the output terminal of pressure transducer 21, thus after converting the pressure and temperature signal collected to density value, converting the output of 4-20mA current signal again to, output signal is connected with junction block 15.Wherein on housing 8, by O-ring seal, watch glass 17 is installed, watch glass 17 is also provided with case 16.
Further, wherein displacement is reduced mechanism 7 and is adopted fan-shaped curved surface gear train, it specifically comprises train wheel bridge 75 and lower plate, be separately installed with the fan-shaped curved surface gear 71 and central gear 73 that are meshed by rotating shaft between this train wheel bridge 75 and lower plate, this fan-shaped curved surface gear 71 reduces the input end of mechanism 7 as displacement, and the rotating shaft of this central gear 73 reduces the output terminal of mechanism 7 as displacement.Wherein the radius of the radius ratio central gear 73 of fan-shaped curved surface gear 71 is little.
Also signal generator is provided with in addition in described housing 8, this signal generator comprises at least one (the such as 3) microswitch 10 be fixed on pedestal 5, and the Signal Regulation mechanism 11 coordinated with this microswitch 10 is installed in the rotating shaft of central gear 73, thus microswitch 10 can be triggered when the rotating shaft of this central gear 73 rotates to certain angle (for 3 microswitches 10, both can trigger simultaneously, also the triggering amount of 3 switches can be made different, to represent three kinds of different gas pressure situation respectively), all microswitches 10 are all connected with junction block 15 in addition.The wherein some eccentric wheels equal with microswitch 10 quantity specifically installed in the rotating shaft of central gear 73 of Signal Regulation mechanism 11.
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:
Embodiment 1:
Refer to Fig. 3, 4, 5 and 6, the present invention is a kind of telemetering type sulfur hexafluoride gas density relay, comprise Bourdon tube 3, temperature compensation sheet 4, pedestal 5, connecting link 6, mechanism 7 is reduced in displacement, housing 8, joint 9, microswitch 10, Signal Regulation mechanism 11, linking arm 13, pipe emits seat 14, junction block 15, watch glass 17, case 16, temperature sensor 20, pressure transducer 21, amplifying circuit, single-chip microcomputer, power module, digital analog converter, voltage current adapter, electric current galvanostat, print (circuit) plate 28, electric wire 12 and switch reinforcing mechanisms, the present embodiment is using three microswitches 10 as gas density relay signal generator, this gas density relay is also with the index dial 1 for showing indicating value and pointer 2.Wherein, temperature sensor 20 sealing is fixed on the right flank of pedestal 5, and temperature sensor 20 and sulfur hexafluoride gas contact with each other, and accurately can measure the temperature value of sulfur hexafluoride gas.Pressure transducer 21 sealing is fixed on after pedestal 5, and amplifying circuit, single-chip microcomputer, power module, digital analog converter, voltage current adapter, electric current galvanostat are fixed on printing (circuit) plate, and printed board 28 is positioned at after pedestal 5, and after housing 8, amplifying circuit, single-chip microcomputer, power module, digital analog converter, voltage current adapter, electric current galvanostat are positioned at the surrounding of pressure transducer 21.
Principle of work or the step of telemetering type sulfur hexafluoride gas density relay are as follows: by the measurement of pressure transducer 21, temperature sensor 20 pairs of pressure and temperatures, through amplifying circuit, the signal of the pressure and temperature measured is amplified, the signal of the pressure and temperature of this amplification, through the collection of single-chip microcomputer, obtains sulfur hexafluoride gas density P through single-chip microcomputer internal calculation
20, this sulfur hexafluoride gas density P
20conversion through digital analog converter makes it the P converting voltage signal to
20U, then again through the conversion of voltage current adapter, make the P of voltage signal
20Uconvert the P of current signal to
20I, then through the effect of excess current galvanostat, make the sulfur hexafluoride gas density P of current signal
20Ican long-distance transmissions, and then realize the density of on-line monitoring sulfur hexafluoride gas electrical equipment.Signals collecting, the internal calculation of above-mentioned single-chip microcomputer, all adopt existing routine techniques means with voltage signal output etc.Such as internal calculation process is especially by the SF under formulae discovery or inquiry relevant temperature pressure condition
6density data can obtain.
And one end of the Bourdon tube 3 of density monitor is welded on pedestal 5, the other end is welded on pipe and emits on seat 14, and pipe emits seat 14 to be fixed together with one end of temperature compensation sheet 4, and the other end and the linking arm 13 of temperature compensation sheet 4 are fixed together; Linking arm 13 fixes with one end of connecting link 6 again, and the initiating terminal that mechanism 7 is reduced in the other end and the displacement of connecting link 6 is connected; Displacement reduces mechanism 7 for fan-shaped curved surface gear train.Microswitch 10 is separately fixed on pedestal 5, and microswitch 10 is respectively with contact operating grip 1011.Signal Regulation mechanism 11 and three microswitch 10 corresponding pairs arrange and are arranged on central shaft 72 respectively, and central shaft 72 is the extension of gear shaft 70 and is integrally formed with gear shaft 70.Signal Regulation mechanism 11 is the eccentric wheel that three compartment of terrains are arranged on central shaft 72.Index dial 1 is fixed on pedestal 5, and pointer 2 is fixed on the front end of movement gear shaft 70.Signal Regulation mechanism 11 drives contact operating grip 1011 according to gas density value and force value, makes the contact on microswitch 10 or disconnection; The contact of microswitch 10 is connected on junction block 15 by electric wire 12, and junction block 15 is fixed on housing 8; Joint 9 is fixed on housing 8, and watch glass 17, case 16 and O-ring seal thereof are separately fixed on housing 8, can invade from mechanical damage and dirt, rainwater by protective housing 8 internal mechanism.One end of deferent is connected with pedestal 5, and positiver sealing, the other end of deferent is connected with joint 9, and positiver sealing, (switch reinforcing mechanisms joins together with screw by several reinforcements switch reinforcing mechanisms, nut is fixed on the side of each fine motion (type) switch, formed respectively with the reinforcing mechanisms of the width adaptation of switch housing, only good booster action is played to the shell of each microswitch, its shape is rectangle) be fixed on microswitch 10, when switch carries out breaking-closing operating generation judder, microswitch 10 shell can be avoided to rupture, and avoid the contact operating grip 1011 of microswitch 10 to come off, thus the resistance to shock of relay can greatly be improved, guarantee system reliably working.
See Fig. 4, linking arm 13 is connected with one end of connecting link 6 again, and the initiating terminal that mechanism 7 is reduced in the other end and the displacement of connecting link 6 is connected; Displacement reduces mechanism 7 for fan-shaped curved surface gear train, and it comprises gear shaft 70, fan-shaped curved surface gear 71, central gear 73, train wheel bridge 75, lower plate; Train wheel bridge 75 and lower plate are fixed on support 5 at interval and in parallel, a fan-shaped curved surface rotary gear shaft 710 is connected between train wheel bridge 75 and lower plate, the center of circle also radially one extension one transmission arm 711 of fan-shaped curved surface gear 71, fan-shaped curved surface gear 71 is arranged on fan-shaped curved surface rotary gear shaft 710, and one end of transmission arm 711 reduces mechanism 7 initiating terminal as displacement is connected with the other end of connecting link 6; The end that reduces that central gear 73 reduces mechanism 7 as displacement to be fixedly mounted on gear shaft 70 and to be connected with a joggle with fan-shaped curved surface gear 71; Radius due to the radius ratio central gear 73 of fan-shaped curved surface gear 71 little 3 times be its 1/3, so can the effect of reducing be played.Sulfur hexafluoride gas density relay of the present invention is due to signal generator employing microswitch 10, and the control of microswitch 10 contact is all reduced mechanism 7 by displacement and was controlled afterwards by reducing, utilize this displacement to reduce mechanism 7 displacement is reduced, object makes vibration reduce, and reaches damping moral effect.
When gas density value changes, Bourdon tube 3 and temperature compensation sheet 4 produce displacement, this is displaced through connecting link 6 and is delivered to the initiating terminal that mechanism 7 is reduced in displacement, the end (central gear 73 and gear shaft 70) that reduces that mechanism 7 is reduced in displacement is connected with the contact operating grip 1011 of microswitch 10 by Signal Regulation mechanism 11, contact operating grip 1011 is driven according to gas density value and force value, make the contact on microswitch 10 or disconnection, and then make microswitch 10 send (switching value) signal accordingly, complete the function of density monitor.
Sulfur hexafluoride gas density relay of the present invention is based on flexible member Bourdon tube 3, utilizes the pressure and temperature of temperature compensation sheet 4 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 temperature compensation sheet 4, the change of its density value, force value also changes accordingly, force the end of Bourdon tube 3 to produce corresponding elastic deformation-displacement, by means of temperature compensation sheet 4 and connecting link 6, pass to the gear shaft 70 that mechanism 7 is reduced in displacement, gear shaft 70 passes to again pointer 2, then tested sulfur hexafluoride gas density value is indicated on index dial 1.If leaked gas, its density value drops to a certain degree (reaching warning or locking value), Bourdon tube 3 produces corresponding to bottom offset, by temperature compensation sheet 4, make linking arm 13 to bottom offset, pass to connecting link 6, connecting link 6 passes to displacement and reduces mechanism 7, fan-shaped axle 71 passes to central shaft and reduces, central shaft 72 drives corresponding Signal Regulation mechanism 11 to rotate, time to a certain extent, Signal Regulation mechanism 11 just triggers the contact operating grip 1011 of corresponding microswitch 10, corresponding microswitch 10 contact is just connected, send corresponding signal (reporting to the police or locking), reach the sulfur hexafluoride gas density in the equipment such as monitoring and controlling electric switch, make electrical equipment trouble free service.If its density value increases, force value also raises accordingly, be elevated to a certain degree, Bourdon tube 3 also produces corresponding to top offset, by temperature compensation sheet 4, make linking arm 13 to top offset, pass to connecting link 6, connecting link 6 passes to displacement and reduces mechanism 7, and fan-shaped axle 71 passes to central shaft 72, and central shaft 72 drives corresponding Signal Regulation mechanism 11, time to a certain extent, Signal Regulation mechanism 11 does not just trigger corresponding microswitch 10, and corresponding microswitch 10 contact just disconnects, and signal (reporting to the police or locking) is just removed.
In sum, sulfur hexafluoride gas density relay of the present invention adopts pressure transducer 21, temperature sensor 20, pressure and temperature signal is gathered by pressure transducer 21, temperature sensor 20, density value is converted to through single-chip microcomputer 23 process, after digital analog converter, voltage current adapter and the process of electric current galvanostat, sulfur hexafluoride gas density value can be converted to current signal (4 ~ 20mA), realize long-distance transmissions, and then realize the density of on-line monitoring sulfur hexafluoride gas electrical equipment.Signals collecting, the internal calculation of above-mentioned single-chip microcomputer, all adopt existing routine techniques means with voltage signal output etc.
This density monitor is due to signal generator employing microswitch 10 in addition, and the control of microswitch 10 contact is all reduced mechanism 7 by displacement and was controlled afterwards by reducing, object makes vibration reduce, reach damping moral effect, so resistance to shock is high, contact good electric property, life-span length, temperature compensation performance are more accurate.Provide in the present invention that a kind of precision is high, the good electric property of signal generator, contacts are good, the sulfur hexafluoride gas density relay with density transporting function can also be realized simultaneously, may be used for the density of sulfur hexafluoride gas in control & monitor airtight container, and for the Leakage Gas situation occurred in sulfur hexafluoride electrical equipment, send alerting signal and block signal in time, realize SF simultaneously
6the SF of electrical equipment
6the on-line monitoring of gas density, for ensureing that electric power safety plays a role.Owing to additionally using pressure transducer, temperature sensor in the present invention, pressure and temperature signal is gathered by pressure transducer, temperature sensor, density value is converted to through single-chip microcomputer process, after digital analog converter, voltage current adapter and the process of electric current galvanostat, can sulfur hexafluoride gas density value be converted to current signal, realize long-distance transmissions, and then realize the density of on-line monitoring sulfur hexafluoride gas electrical equipment.
Also tool has the following advantages in addition: in the gas density relay in the present invention, the displacement of Bourdon tube and temperature compensation sheet is reduced mechanism through displacement and this displacement is reduced, then remove control signal generator (some microswitches), reach the object of damping.This displacement is reduced mechanism and is controlled microswitch according to the size of gas density value, microswitch is made to send corresponding signal, complete the function of density monitor, thus the not high problem of the resistance to shock overcoming prior art, ensure that the advantages such as the good electric property of density monitor, contacts are good, long working life, ensure that system reliably working, can be applied on sulfur hexafluoride electrical equipment well.
2, the micro-water transmitter of sulfur hexafluoride gas density:
As Fig. 7, shown in 8, the micro-water transmitter of a kind of novel sulfur hexafluoride gas density is additionally provided in the present invention, comprise housing 201, this housing 201 is provided with jointing 211 and the rear end of this jointing 211 stretches in housing 201, the rear end of the jointing 211 in this housing 201 is separately installed with pressure transducer 202, temperature sensor 203 and micro-water sensor 204, this pressure transducer 202, temperature sensor 203 is connected with signal processing circuit with micro-water sensor 204, thus the 4-20mA standard current signal corresponding with micro-water content to the sulfur hexafluoride gas density value detected can be exported.
Its middle shell 201 forms by three layers, and wherein internal layer 231 adopts stainless steel material, and middle layer 232 adopts thermal insulation material, and outer 233 adopt stainless steel material, and this thermal insulation material is pottery, plastics or sponge.Signal processing circuit comprises the amplifying circuit 205, single-chip microcomputer 206, digital analog converter 208, voltage current adapter 209 and the electric current galvanostat 210 that connect successively in addition, the rear end of the jointing 211 specifically in housing 201 is provided with printed circuit board (PCB) 212, and described signal processing circuit is located on this printed circuit board (PCB) 212.
In order to solve the problems referred to above that prior art exists, the invention provides the micro-water transmitter of strong, that precision the is high sulfur hexafluoride gas density of a kind of Acclimation temperature ability, for density and the micro-water content of sulfur hexafluoride gas in control & monitor airtight container, and for the Leakage Gas situation occurred in sulfur hexafluoride electrical equipment and micro-water content, send alerting signal and block signal in time, contribute to realizing SF simultaneously
6the SF of electrical equipment
6the on-line monitoring of gas density and micro-water, for ensureing that electric power safety plays a role.The present invention includes housing 201 and be arranged at pressure transducer 202, temperature sensor 203, micro-water sensor 204, amplifying circuit 205, single-chip microcomputer 206, power module 207, digital analog converter 208, voltage current adapter 209, the electric current galvanostat 210 in housing 201.Density of the present invention micro-water transmitter gathers pressure, temperature and micro-water signal by pressure transducer 202, temperature sensor 203, micro-water sensor 204, (this process adopts existing routine techniques means, such as, by the SF under formulae discovery or inquiry relevant temperature pressure condition to convert density value and micro-water content to through single-chip microcomputer 206 process
6density data can obtain), after the process of digital analog converter 208, voltage current adapter 209 and electric current galvanostat 210, can sulfur hexafluoride gas density value and micro-water content be converted to current signal, realize long-distance transmissions, and then contribute to the density and the micro-water content that realize on-line monitoring sulfur hexafluoride gas electrical equipment.
Embodiment 2:
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:
As Fig. 7 and Fig. 8, the present invention includes housing 201 and be arranged at pressure transducer 202, temperature sensor 203, micro-water sensor 204, amplifying circuit 205, single-chip microcomputer 206, power module 207, digital analog converter 208, voltage current adapter 209, electric current galvanostat 210, the jointing 211 in housing 201.Described housing 201 forms by three layers, and wherein internal layer 231 is made for stainless steel material, and middle layer 232 is made for thermal insulation material, and outer 233 are made for stainless steel material.
Micro-water sensor 204 and pressure transducer 202 sealing are fixed on after jointing 211, and are placed in inside internal layer 231.And amplifying circuit 205, single-chip microcomputer 206, power module 207, digital analog converter 208, voltage current adapter 209, electric current galvanostat 210 are fixed on printed circuit board (PCB) 212, and printed circuit board (PCB) 212 is positioned on the rear end of jointing 211, and be placed in inside internal layer 231.
The principle of work of sulfur hexafluoride gas density of the present invention micro-water transmitter is as follows:
By the measurement of pressure transducer 202, temperature sensor 203, micro-water sensor 204 pairs of pressure, temperature and micro-water contents, through amplifying circuit 205, the signal of the pressure measured, temperature and micro-water content is amplified, the signal of the pressure of this amplification, temperature and micro-water content, through the collection of single-chip microcomputer 206, obtains sulfur hexafluoride gas density P through single-chip microcomputer 206 internal calculation
20and micro-water content PPM, this sulfur hexafluoride gas density P20 and micro-water content PPM make it through the conversion of digital analog converter 208 P converting voltage signal form to
20Umicro-water content PPM
u, then again through the conversion of voltage current adapter 209, make the P of voltage signal form
20Uand PPM
uconvert the P of current signal form to
20Iand PPM
i, then through the effect of excess current galvanostat 210, make the sulfur hexafluoride gas density P of current signal
20Iwith micro-water content PPM
ican long-distance transmissions, and then realize density and the micro-water content of on-line monitoring sulfur hexafluoride gas electrical equipment.
In sum, sulfur hexafluoride gas density of the present invention micro-water transmitter forms by three layers due to the housing 201 of the micro-water transmitter of density, wherein internal layer 231 is made for stainless steel material, and middle layer 232 is made for thermal insulation material, and outer 233 are made for stainless steel material.So, density of the present invention micro-water transmitter can effectively measure the sulfur hexafluoride gas density of sulfur hexafluoride electrical equipment inside and micro-water number when environment temperature is suddenlyd change, make its monitoring accuracy higher, sulfur hexafluoride gas density value and micro-water content can be converted to corresponding current signal (4 ~ 20mA) accurately, realize long-distance transmissions, and then realize density and the micro-water content of on-line monitoring sulfur hexafluoride gas electrical equipment.
Sulfur hexafluoride gas density in the present invention micro-water transmitter is owing to have employed above technical scheme, make it compared with prior art, there is following obvious advantage and disadvantage: because the housing of the micro-water transmitter of density forms by three layers, wherein internal layer is that stainless steel material is made, middle layer is that thermal insulation material is made, and outer is made for stainless steel material.So, density of the present invention micro-water transmitter can effectively measure the sulfur hexafluoride gas density of sulfur hexafluoride electrical equipment inside and micro-water number when environment temperature is suddenlyd change, make its monitoring accuracy higher.
Claims (17)
1. the micro-water on-line monitoring system of sulfur hexafluoride gas density, it is characterized in that: comprise the micro-water transmitter of at least one sulfur hexafluoride gas density, and at least one telemetering type sulfur hexafluoride gas density relay, this all sulfur hexafluoride gas density micro-water transmitter is connected with long-range rear station detecting system by hub, IEC61850 protocol converter all successively with telemetering type sulfur hexafluoride gas density relay.
2. the micro-water on-line monitoring system of sulfur hexafluoride gas density as claimed in claim 1, is characterized in that: wherein hub adopts RS485 hub, and IEC61850 protocol converter is also connected with network service printer and network data router respectively.
3. the micro-water on-line monitoring system of sulfur hexafluoride gas density as claimed in claim 1, it is characterized in that: wherein telemetering type sulfur hexafluoride gas density relay comprises housing (8), this housing (8) outside is installed with junction block (15) and joint (9) respectively, at this housing (8) internal fixtion, pedestal (5) is installed, also comprise Bourdon tube (3), one end of this Bourdon tube (3) is fixed on that described pedestal (5) is upper and its other end is connected with one end of temperature compensation sheet (4), the input end that the other end of this temperature compensation sheet (4) reduces mechanism (7) by web member and displacement is connected, the output terminal that mechanism (7) is reduced in this displacement is connected with pointer (2), index dial (1) is also installed with in addition on pedestal (5).
4. the micro-water on-line monitoring system of sulfur hexafluoride gas density as claimed in claim 3, is characterized in that: wherein Bourdon tube adopts C type Bourdon tube, and web member adopts connecting link.
5. the micro-water on-line monitoring system of sulfur hexafluoride gas density as claimed in claim 3, is characterized in that: its center tap (9) is communicated with pressure transducer (21) with the temperature sensor (20) on pedestal (5) by pipeline.
6. the micro-water on-line monitoring system of sulfur hexafluoride gas density as claimed in claim 5, it is characterized in that: wherein temperature sensor (20) is connected with electric current galvanostat by amplifying circuit, single-chip microcomputer (23), digital analog converter, voltage current adapter successively with the output terminal of pressure transducer (21), the output terminal of this electric current galvanostat is also connected with junction block (15), thus converts the output of 4-20mA current signal after converting the pressure and temperature signal collected to density value again to;
Or wherein temperature sensor (20) is connected with junction block (15) respectively with the output terminal of pressure transducer (21), thus is directly exported by the pressure and temperature signal collected.
7. the micro-water on-line monitoring system of sulfur hexafluoride gas density as claimed in claim 3, is characterized in that: wherein on housing, be provided with watch glass by O-ring seal, watch glass is also provided with case.
8. water on-line monitoring system as micro-in the sulfur hexafluoride gas density in claim 3 to 7 as described in any one, it is characterized in that: wherein displacement is reduced mechanism (7) and adopted fan-shaped curved surface gear train, it specifically comprises train wheel bridge (75) and lower plate, be separately installed with the fan-shaped curved surface gear (71) and central gear (73) that are meshed by rotating shaft between this train wheel bridge (75) and lower plate, this fan-shaped curved surface gear (71) reduces the input end of mechanism (7) as displacement, and the output terminal of mechanism (7) is reduced in the rotating shaft of this central gear (73) as displacement.
9. the micro-water on-line monitoring system of sulfur hexafluoride gas density as claimed in claim 8, is characterized in that: wherein the radius of the radius ratio central gear (73) of fan-shaped curved surface gear (71) is little.
10. the micro-water on-line monitoring system of sulfur hexafluoride gas density as claimed in claim 8, it is characterized in that: wherein in described housing (8), be also provided with signal generator, this signal generator comprises at least one microswitch (10) be fixed on pedestal (5), and the Signal Regulation mechanism (11) coordinated with this microswitch (10) is installed in the rotating shaft of central gear (73), thus microswitch (10) can be triggered when the rotating shaft of this central gear (73) rotates to certain angle, and all microswitches (10) are all connected with junction block (15).
The micro-water on-line monitoring system of 11. sulfur hexafluoride gas density as claimed in claim 8, is characterized in that: the wherein eccentric wheel equal with microswitch (10) quantity specifically installed in the rotating shaft of central gear (73) of Signal Regulation mechanism (11).
The micro-water on-line monitoring system of 12. sulfur hexafluoride gas density as claimed in claim 1, it is characterized in that: wherein the micro-water transmitter of sulfur hexafluoride gas density comprises housing (201), this housing (201) is provided with jointing (211) and the rear end of this jointing (211) stretches in housing (201), the rear end of the jointing (211) in this housing (201) is separately installed with pressure transducer (202), temperature sensor (203) and micro-water sensor (204), this pressure transducer (202), temperature sensor (203) is connected with signal processing circuit with micro-water sensor (204), thus the current signal corresponding with micro-water content to the sulfur hexafluoride gas density value detected can be exported.
The micro-water on-line monitoring system of 13. a kind of sulfur hexafluoride gas density as claimed in claim 12, is characterized in that: wherein current signal is 4-20mA.
The micro-water on-line monitoring system of 14. a kind of sulfur hexafluoride gas density as claimed in claim 12, it is characterized in that: its middle shell (201) forms by three layers, wherein internal layer (231) adopts stainless steel material, middle layer (232) adopts thermal insulation material, and outer (233) adopt stainless steel material.
The micro-water on-line monitoring system of 15. a kind of sulfur hexafluoride gas density as claimed in claim 14, is characterized in that: wherein thermal insulation material is pottery, plastics or sponge.
16. water on-line monitoring systems as micro-in a kind of sulfur hexafluoride gas density in claim 12 to 15 as described in any one, is characterized in that: wherein signal processing circuit comprises the amplifying circuit (205), single-chip microcomputer (206), digital analog converter (208), voltage current adapter (209) and the electric current galvanostat (210) that connect successively.
17. water on-line monitoring systems as micro-in a kind of sulfur hexafluoride gas density in claim 12 to 15 as described in any one, it is characterized in that: the rear end of the jointing (211) wherein in housing (201) is provided with printed circuit board (PCB) (212), and described signal processing circuit is located on this printed circuit board (PCB) (212).
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| CN201410643859.4A CN104460480B (en) | 2014-11-11 | 2014-11-11 | The micro- water on-line monitoring system of sulfur hexafluoride gas density |
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