CN101231919A - Method for deciding locating piece position in SF6 gas density relay - Google Patents
Method for deciding locating piece position in SF6 gas density relay Download PDFInfo
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- CN101231919A CN101231919A CNA2008100334897A CN200810033489A CN101231919A CN 101231919 A CN101231919 A CN 101231919A CN A2008100334897 A CNA2008100334897 A CN A2008100334897A CN 200810033489 A CN200810033489 A CN 200810033489A CN 101231919 A CN101231919 A CN 101231919A
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Abstract
The invention relates to an SF6 gas density relay, in particular to a method for determining the positions of locating pieces in the SF6 gas density relay. The SF6 gas density relay, for which the method is applicable, comprises a regulating lever, inching switches, an end holder and locating pieces. The end holder is fixed on the end of a Bourdon tube, and is connected with one end of a temperature compensation sheet. The locating pieces are fixed in the encloser with the front ends thereof extend under the end holder connecting the Bourdon tube and the temperature compensation sheet. The invention is characterized in that the Bourdon tube moves downwards with the decrease of the actual pressure of the density relay until the actual pressure of the density relay is less than or equal to the pressure at the minimum temperature. When the actual pressure of the density relay is less than or equal to the pressure at the minimum temperature, the end holder at the end of the Bourdon tube touches the locating piece and is prevented from moving downwards. The rated operating pressure of the density relay ranges from 0.20 MPa to 0.41 MPa. By adopting the technical proposal, the density relay does not fail in low temperature environment, thus ensuring reliable working of the system.
Description
Technical field
The present invention relates to the SF6 gas density relay, the method for determining locating piece position in particularly a kind of SF6 gas density relay.
Background technology
The SF6 electric product has been widely used in power department, and industrial and mining enterprises have promoted the fast development of power industry.The reliable and secure operation that guarantees the SF6 electric product has become one of vital task of power department.The arc-extinguishing medium of SF6 electric product and dielectric are SF6 gas, can not leak gas, if leak gas, just can not guarantee the reliable and secure operation of SF6 electric product.So the SF6 density value of monitoring SF6 electric product is very necessary.Be used for monitoring the pointer density monitor that SF6 density generally adopts a kind of machinery now, this relay has can report to the police when gas leakage takes place the SF6 electric product and the function of locking, also has the performance of on-the-spot display density value.Because this relay generally adopts hairspring type electric contact, help formula suction though added magnetic, the reliable closure of docking point is helpful, but when the SF6 gas density was higher than set point, its movable contact was moving along with pointer, because the power of hairspring is very little, magnetic helps formula suction can not transfer too greatly, in order to improve its vibration resistance, generally all is filled with silicone oil, since on making, ubiquity leakage of oil problem.In case leakage of oil, the user has only and changes relay again, causes economic loss.
Also have a kind of contact to adopt the no oil type SF6 gas density relay of sensitive switch in addition, a kind of contact of prior art adopts structure such as Fig. 1 of the no oil type SF6 gas density relay of sensitive switch, shown in Figure 2, it comprises SF6 gas connection 1, movement 2, housing 3, dial 4, pointer 5, Bourdon tube 6, temperature-compensating sheet 7, terminal box 8, sensitive switch 91,92,93, printed circuit board 10, keeper 11, fixed head 12, electric wire 13, adjusting rod 141,142,143, connecting rod 15, crossbeam 16, watch crystal 17, cover circle 18, pedestal 19 and SF6 air shooter 20.Wherein, SF6 gas connection 1, terminal box 8, watch crystal 17, cover circle 18 and pedestal 19 are separately fixed on the housing 3.Movement 2 is fixed on the pedestal 19, and pointer 5 and dial 4 are separately fixed on the movement 2.One end of Bourdon tube 6 is welded on the pedestal 19 and is communicated with it, and the other end is connected with an end of temperature-compensating sheet 7, and the other end of temperature-compensating sheet 7 is connected with crossbeam 16, and crossbeam 16 is connected with connecting rod 15 again, and connecting rod 15 is connected with movement 2.Be fixed with adjusting rod 141,142,143 on the crossbeam 16.Sensitive switch 91,92,93 is welded on respectively on the printed circuit board 10, and printed circuit board 10 is installed on the fixed head 12, and fixed head 12 is installed in again on the pedestal 19.Sensitive switch 91 is fixed on the below of adjusting rod 141, and sensitive switch 92 is fixed on the below of adjusting rod 142, and sensitive switch 93 is fixed on the below of adjusting rod 143.Be respectively equipped with motion arm 911,921,931 on each sensitive switch.Keeper 11 is fixed on the movement 2; its front end extends to the end seat below of the end that Bourdon tube 6 links to each other with temperature-compensating sheet 7; its function is: when the SF6 gas density drops to certain value; spacing Bourdon tube 6 moves down; the protection sensitive switch; and then protection crossbeam 16 do not damaged by pressure and is out of shape, and makes whole system keep reliably working.The contact of sensitive switch by electric wire 13, is connected on the terminal box 8 from printed circuit board 10, and terminal box 8 is fixed on the watchcase 3.Watch crystal 17, cover circle 18 are separately fixed on the watchcase 3, can protect its internal mechanism to avoid mechanical damage and dirt, rainwater are invaded.One end of SF6 air shooter 20 is connected with pedestal 19, and positiver sealing, and the other end of SF6 air shooter 20 is connected with joint 1, and positiver sealing.
Though the sensitive switch that above-mentioned SF6 gas density relay is adopted has certain advantage, the fixed position of the keeper 11 in this SF6 gas density relay existing problems.For example, a kind of density monitor is arranged, the normal pressure operating value P during 20 ℃ of the locking contacts of its specified requirement
20 ℃Be 0.33Mpa (relative pressure, in full with), but the fixed position of the keeper in this relay drop at this relay actual pressure 〉=during 0.25Mpa, just begin spacing Bourdon tube and move down.So just may cause when temperature is lower than-35 ℃, the blocking function of this density monitor lost efficacy, even the whole light leaks of SF6 gas on the SF6 electric equipment, can not send block signal yet.Because SF6 gas is along with the reduction of temperature, its force value also reduces accordingly, and when being lower than-35 ℃ in temperature, the corresponding actual pressure of pairing density value is for being lower than 0.24Mpa.So reflection force value that Bourdon tube just can not be correct just makes the blocking function of this density monitor lose efficacy, and can not guarantee system's reliably working.The dial of this density monitor in addition, its starting point force value is 0.25Mpa, so the difference Δ P≤0.08Mpa of minimum movements locking contact pressure value and starting point force value on the dial of this density monitor.Make under hot environment that so the compensating plate of relay and pointer can be out of shape, can not stably work, can not guarantee system's reliably working.Therefore be necessary meticulous design is made in the fixed position of keeper, to guarantee system's reliably working.
Summary of the invention
The objective of the invention is to solve the fixed position that has SF6 gas density relay keeper now drops to 〉=P at this relay actual pressure
Minimum temperatureDuring value, make the reflection force value that Bourdon tube can not be correct with regard to beginning spacing Bourdon tube to move down, the blocking function of density monitor lost efficacy, can not guarantee the problem of system's reliably working, and the invention provides method for determining locating piece position in a kind of SF6 gas density relay, so that the relay that manufacturing is come out can guarantee system's reliably working.
Realize that the object of the invention technical scheme is: the method for determining locating piece position in a kind of SF6 gas density relay, the SF6 gas density relay that this method is suitable for comprises housing and is arranged on the interior pedestal of housing, Bourdon tube, the temperature-compensating sheet, crossbeam, one or more each self-corresponding adjusting rod and sensitive switches, end seat and keeper, end seat wherein is fixed on the end of Bourdon tube and links to each other with an end of temperature-compensating sheet, and keeper is fixed in the housing, its front end extends to the below of the end seat that Bourdon tube links to each other with the temperature-compensating sheet, wherein: the normal pressure action lower limit P during according to 20 ℃ of the locking of the specified requirement of SF6 gas density relay and/or warning contacts
20 ℃, and this P
20 ℃Minimum corresponding to this density monitor
Work temperature
Minimum temperatureThe time pressure value P
Minimum temperatureDetermine the fixed position of keeper, this fixed position can guarantee that described Bourdon tube descends along with the density monitor actual pressure and moves down, and drops to≤P up to the density monitor actual pressure
Minimum temperatureDuring value, the end seated connection of Bourdon tube end contacts keeper and is limited to continue to move down, and the rated operating pressure scope of described density monitor is 0.20Mpa ∽ 0.41Mpa.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.33Mpa, then when this density monitor actual pressure drop to≤during 0.24Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.32Mpa, then when this density monitor actual pressure drop to≤during 0.22Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.31Mpa, then when this density monitor actual pressure drop to≤during 0.21Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.30Mpa, then when this density monitor actual pressure drop to≤during 0.205Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.34Mpa, then when this density monitor actual pressure drop to≤during 0.24Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.35Mpa, then when this density monitor actual pressure drop to≤during 0.25Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.25Mpa, then when this density monitor actual pressure drop to≤during 0.18Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.20Mpa, then when this density monitor actual pressure drop to≤during 0.14Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Owing to adopted above-mentioned technical solution, done correct processing at the keeper fixed position, make like this and can not lose efficacy at low temperature environment lower density relay, and the system of assurance reliably working; Can also make under hot environment that the compensating plate of relay and pointer can not be out of shape, can stably work, improve the performance of this SF6 gas density relay greatly.
Description of drawings
Fig. 1 is the structural representation of a kind of pointer SF6 gas density relay of prior art;
Fig. 2 is the partial side view of structure shown in Figure 1;
Fig. 3 is the primary structure schematic diagram of SF6 gas density relay involved in the present invention;
Fig. 4 is the partial side view of structure shown in Figure 3;
Fig. 5 is the dial of SF6 gas density relay involved in the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and embodiments.
Method for determining locating piece position in a kind of SF6 gas density relay, the SF6 gas density relay that this method is suitable for comprises housing and is arranged on the interior pedestal of housing, Bourdon tube, the temperature-compensating sheet, crossbeam, one or more each self-corresponding adjusting rod and sensitive switches, end seat and keeper, end seat wherein is fixed on the end of Bourdon tube and links to each other with an end of temperature-compensating sheet, and keeper is fixed in the housing, its front end extends to the below of the end seat that Bourdon tube links to each other with the temperature-compensating sheet, wherein: the normal pressure action lower limit P during according to 20 ℃ of the locking of the specified requirement of SF6 gas density relay and/or warning contacts
20 ℃, and this P
20 ℃Minimum operating temperature T corresponding to this density monitor
Minimum temperatureThe time pressure value P
Minimum temperatureDetermine the fixed position of keeper, this fixed position can guarantee that described Bourdon tube descends along with the density monitor actual pressure and moves down, and drops to≤P up to the density monitor actual pressure
Minimum temperatureDuring value, the end seated connection of Bourdon tube end contacts keeper and is limited to continue to move down, and the rated operating pressure scope of described density monitor is 0.20Mpa ∽ 0.41Mpa.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.33Mpa, then when this density monitor actual pressure drop to≤during 0.24Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.32Mpa, then when this density monitor actual pressure drop to≤during 0.22Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.31Mpa, then when this density monitor actual pressure drop to≤during 0.21Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.30Mpa, then when this density monitor actual pressure drop to≤during 0.205Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.34Mpa, then when this density monitor actual pressure drop to≤during 0.24Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.35Mpa, then when this density monitor actual pressure drop to≤during 0.25Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.25Mpa, then when this density monitor actual pressure drop to≤during 0.18Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Further, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.20Mpa, then when this density monitor actual pressure drop to≤during 0.14Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
Referring to Fig. 3,4, the embodiment of the invention is an example with a kind of pointer SF6 gas density relay, related pointer SF6 gas density relay is mainly by joint, movement 2, watchcase, dial, pointer 5, Bourdon tube 6, temperature-compensating sheet 7, terminal box, one to four corresponding separately sensitive switch and the adjusting rod that is provided with, present embodiment is three, sees sensitive switch 911 among the figure, 921,931 and adjusting rod 141,142,143, printed circuit board 10, keeper 11, fixed head 12, electric wire 13, connecting rod 15, crossbeam 16, watch crystal, the cover circle, the end seat, pedestal 19, backing plate 51 and deferent are formed.Wherein, joint is fixed on the watchcase, and movement 2 is fixed on the pedestal 19, and pedestal 19, backing plate 51 fuse and be fixed on the watchcase.One end of Bourdon tube 6 is welded on the pedestal 19, and the other end is connected with an end of temperature-compensating sheet 7 by the end seat, and the other end of temperature-compensating sheet 7 is connected with crossbeam 16.Be fixed with adjusting rod 141,142,143 on the crossbeam 16.Crossbeam 16 is connected with connecting rod 15 again, and connecting rod 15 is connected with movement 2 again.Sensitive switch 911,921,931 is welded on respectively on the printed circuit board 10, and printed circuit board 10 is fixed on the fixed head 12, and fixed head 12 is installed in again on the pedestal 19.Sensitive switch 911,921,931 correspondences in the present embodiment are arranged on the below of each adjusting rod, wherein, sensitive switch 911 is fixed on the below of adjusting rod 141, and sensitive switch 921 is fixed on the below of adjusting rod 142, and sensitive switch 931 is fixed on the below of adjusting rod 143.Present embodiment keeper 11 is fixed on the movement 2, and pointer 5 and dial are separately fixed on the movement 2.Be respectively equipped with motion arm 9111,9211,9311 on each sensitive switch.The contact of sensitive switch is connected on the terminal box from printed circuit board 10 by electric wire 13, and terminal box is fixed on the watchcase.Watch crystal, cover circle are separately fixed on the watchcase, can protect its internal mechanism to avoid mechanical damage and dirt, rainwater are invaded.One end of deferent is connected with pedestal 19, and positiver sealing; The other end of deferent is connected with joint, and positiver sealing.
The normal pressure action lower limit P of the present invention during according to 20 ℃ of the locking of the specified requirement of density monitor and/or warning contacts
20 ℃, and this P
20 ℃Minimum operating temperature T corresponding to this density monitor
Minimum temperatureThe time pressure value P
Low temperatureDetermine the fixed position of keeper, this fixed position can guarantee to drop to≤P when the density monitor actual pressure
Minimum temperatureThe time, keeper just begins spacing Bourdon tube and moves down; The rated operating pressure of density monitor is 0.2Mpa ∽ 0.41Mpa again.Normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described density monitor and/or warning contacts
20 ℃Refer to its minimum movements contact pressure lower limit, the desired action connection point low pressure limit of the actual minimum value that promptly refers to the applied SF6 electric equipment of this density monitor, refer generally to the block action lower limit (when no locking requires, refer to the actuation of an alarm lower limit), and the normal pressure value when referring to 20 ℃; Force value in a separate paper all is a relative pressure, if represent with absolute pressure value, then wants the corresponding 0.1Mpa that adds, i.e. absolute pressure=relative pressure+0.1Mpa; Described density monitor comprises pointer SF6 gas density relay, non-pointer SF6 gas density relay, digital display type SF6 gas density relay.
The characteristics of SF6 gas density relay involved in the present invention are, the fixed position of keeper wherein is the normal pressure operating value P during according to 20 ℃ of the locking of the specified requirement of density monitor and/or warning contacts
20 ℃, and this P
20 ℃Minimum operating temperature T corresponding to this density monitor
Minimum temperatureThe time pressure value P
Minimum temperatureDetermine that this fixed position can guarantee to drop to≤P when the density monitor actual pressure
Minimum temperatureThe time, keeper just begins spacing Bourdon tube and moves down.For example, the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of pointer SF6 gas density relay and/or warning contacts
20 ℃During for 0.33Mpa, the fixed position of keeper can guarantee: when this density monitor actual pressure drop to≤during 0.24Mpa, keeper just begins spacing Bourdon tube and moves down.Both when this density monitor actual pressure during greater than 0.24Mpa, keeper can not move down by spacing Bourdon tube, and promptly Bourdon tube is can be free-moving, if load onto the dial of OK range this moment, when 20 spent, the indicated indicating value of its pointer was correct.Though because SF6 gas is along with the reduction of temperature, its force value also reduces accordingly, when being lower than-40 ℃ in temperature, the normal pressure operating value P during 20 ℃ of the locking contacts of its specified requirement
20 ℃The corresponding actual pressure of pairing density value is 0.24Mpa during for 0.33Mpa.This value 0.24Mpa is greater than or equal to the spacing value 0.24Mpa of keeper to Bourdon tube, and so, Bourdon tube can also correctly reflect force value when low temperature, and the blocking function of this density monitor just can not lose efficacy, and can guarantee system's reliably working.
As Fig. 5, the dial of above-mentioned density monitor, its starting point force value is 0.20Mpa, the pressure differential Δ P=0.13Mpa 〉=0.08Mpa on this density monitor dial between minimum movements locking contact pressure value and the starting point force value.Make under hot environment that so the compensating plate of relay and pointer can not be out of shape, can guarantee that this relay stably works, also can guarantee system's reliably working.
The action principle of SF6 gas density relay involved in the present invention is based on flexible member Bourdon tube 6, utilizes the pressure and temperature of 7 pairs of variations of temperature-compensating sheet to revise, the variation of the SF6 gas density in the reaction airtight container.Promptly under the pressure effect of measured medium SF6 gas, because the effect of temperature-compensating sheet 7 has been arranged, the variation of its density value, force value also changes accordingly, force the end of Bourdon tube 6 to produce corresponding strain-displacement,, pass to movement 2 by means of temperature-compensating sheet 7 and connecting rod 15, movement 2 passes to pointer 5 again, then tested SF6 gas density value is indicated on dial.If leaked gas, its density value drops to a certain degree (reach and report to the police or the locking value), Bourdon tube 6 produces accordingly to bottom offset, by temperature-compensating sheet 7, make crossbeam 16 to bottom offset, the adjusting rod 141,142,143 on the crossbeam 16 just promotes the contact of corresponding sensitive switch 911,921,931 and connects, and sends corresponding signal (reporting to the police or locking), reach the SF6 gas density in the equipment such as supervision and control electric switch, make the electric equipment trouble free service.If its density value has raise, force value also raises accordingly, be elevated to a certain degree, Bourdon tube 6 also produces accordingly to top offset, by temperature-compensating sheet 7, makes crossbeam 16 to top offset, adjusting rod 141,142,143 on the crossbeam 16 is just to top offset, adjusting rod 141,142,143 is just away from sensitive switch 911,921,931, and its contact just disconnects, and signal (reporting to the police or locking) is just removed.So just finish the function of density monitor.
Keeper of the present invention is the normal pressure action lower limit P during according to 20 ℃ of the locking of specified requirement and/or warning contacts
20 ℃The SF6 gas of pairing density value is at this density monitor minimum operating temperature value T
Minimum temperatureThe time corresponding actual pressure value P
Minimum temperatureDetermine its fixed position, this fixed position can guarantee: when the density monitor actual pressure drops to smaller or equal to P
Minimum temperatureThe time, keeper just begins spacing Bourdon tube and moves down.Both worked as the density monitor actual pressure greater than P
Minimum temperatureThe time, keeper can not move down by spacing Bourdon tube, and promptly Bourdon tube is can be free-moving, if load onto the dial of OK range this moment, when 20 spent, the indicated indicating value of its pointer was correct.Pressure differential Δ P 〉=0.09Mpa between minimum movements contact pressure value and the starting point force value on its dial of this density monitor again.So, the present invention just makes and can not lose efficacy at low temperature environment lower density relay owing to done correct processing at the keeper fixed position, and the system of assurance reliably working; Can also make under hot environment that the compensating plate of relay and pointer can not be out of shape, can stably work, improve the performance of this SF6 gas density relay greatly.Simultaneously also because the length that this SF6 gas density relay is arranged on the motion arm on each sensitive switch can be designed as 21 ~ 50mm, the impulse stroke of the motion arm of sensitive switch is big, element such as adjusting rod or compensating plate changes slightly, just can muchly not influence the precision of density monitor.Simultaneously when debugging, also be easy to precision transfer very accurate, be easy to make high-precision density monitor.
Need to prove: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described density monitor and/or warning contacts
20 ℃During for 0.37Mpa, the fixed position of described keeper can guarantee: when this density monitor actual pressure drop to≤during 0.265Mpa, keeper just begins spacing Bourdon tube and moves down; Normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described density monitor and/or warning contacts
20 ℃During for 0.38Mpa, the fixed position of described keeper can guarantee: when this density monitor actual pressure drop to≤during 0.275Mpa, keeper just begins spacing Bourdon tube and moves down; Normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described density monitor and/or warning contacts
20 ℃During for 0.22Mpa, the fixed position of described keeper can guarantee: when this density monitor actual pressure drop to≤during 0.14Mpa, keeper just begins spacing Bourdon tube and moves down; Normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described density monitor and/or warning contacts
20 ℃During for 0.27Mpa, the fixed position of described keeper can guarantee: when this density monitor actual pressure drop to≤during 0.18Mpa, keeper just begins spacing Bourdon tube and moves down.
Above embodiment is only for the usefulness that the present invention is described, person skilled in the relevant technique under the situation that does not break away from the spirit and scope of the present invention, can also be made various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (9)
1. the method for determining locating piece position in the SF6 gas density relay, the SF6 gas density relay that this method is suitable for comprises housing and is arranged on the interior pedestal of housing, Bourdon tube, the temperature-compensating sheet, crossbeam, one or more each self-corresponding adjusting rod and sensitive switches, end seat and keeper, end seat wherein is fixed on the end of Bourdon tube and links to each other with an end of temperature-compensating sheet, and keeper is fixed in the housing, its front end extends to the below of the end seat that Bourdon tube links to each other with the temperature-compensating sheet, it is characterized in that: the normal pressure action lower limit P during according to 20 ℃ of the locking of the specified requirement of SF6 gas density relay and/or warning contacts
20 ℃, and this P
20 ℃Minimum operating temperature T corresponding to this density monitor
Minimum temperatureThe time pressure value P
Lowest temperatureDegree is determined the fixed position of keeper, and this fixed position can guarantee that described Bourdon tube along with the decline of density monitor actual pressure and move down, drops to≤P up to the density monitor actual pressure
Minimum temperatureDuring value, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down, and the rated operating pressure scope of described density monitor is 0.20Mpa ∽ 0.41Mpa.
2. the method for determining locating piece position in the SF6 gas density relay according to claim 1 is characterized in that: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.33Mpa, then when this density monitor actual pressure drop to≤during 0.24Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
3. the method for determining locating piece position in the SF6 gas density relay according to claim 1 is characterized in that: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.32Mpa, then when this density monitor actual pressure drop to≤during 0.22Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
4. the method for determining locating piece position in the SF6 gas density relay according to claim 1 is characterized in that: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.31Mpa, then when this density monitor actual pressure drop to≤during 0.21Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
5. the method for determining locating piece position in the SF6 gas density relay according to claim 1 is characterized in that: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.30Mpa, then when this density monitor actual pressure drop to≤during 0.205Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
6. the method for determining locating piece position in the SF6 gas density relay according to claim 1 is characterized in that: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.34Mpa, then when this density monitor actual pressure drop to≤during 0.24Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
7. the method for determining locating piece position in the SF6 gas density relay according to claim 1 is characterized in that: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.35Mpa, then when this density monitor actual pressure drop to≤during 0.25Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
8. the method for determining locating piece position in the SF6 gas density relay according to claim 1 is characterized in that: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.25Mpa, then when this density monitor actual pressure drop to≤during 0.18Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
9. the method for determining locating piece position in the SF6 gas density relay according to claim 1 is characterized in that: the normal pressure operating value P when 20 ℃ of the locking of the specified requirement of described SF6 gas density relay and/or warning contacts
20 ℃During for 0.20Mpa, then when this density monitor actual pressure drop to≤during 0.14Mpa, the end seated connection of described Bourdon tube end contacts keeper and is limited to continue to move down.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100334897A CN101231919A (en) | 2008-02-03 | 2008-02-03 | Method for deciding locating piece position in SF6 gas density relay |
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| CNA2008100334897A CN101231919A (en) | 2008-02-03 | 2008-02-03 | Method for deciding locating piece position in SF6 gas density relay |
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| CN101231919A true CN101231919A (en) | 2008-07-30 |
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| CNA2008100334897A Pending CN101231919A (en) | 2008-02-03 | 2008-02-03 | Method for deciding locating piece position in SF6 gas density relay |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441195A (en) * | 2019-09-04 | 2019-11-12 | 上海乐研电气有限公司 | A kind of gas density relay and its method of calibration with online self checking function |
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2008
- 2008-02-03 CN CNA2008100334897A patent/CN101231919A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441195A (en) * | 2019-09-04 | 2019-11-12 | 上海乐研电气有限公司 | A kind of gas density relay and its method of calibration with online self checking function |
| CN110441195B (en) * | 2019-09-04 | 2024-05-14 | 上海乐研电气有限公司 | Gas density relay with online self-checking function and checking method thereof |
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