CN203013569U - Display used for high voltage fuse - Google Patents
Display used for high voltage fuse Download PDFInfo
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- CN203013569U CN203013569U CN 201220736797 CN201220736797U CN203013569U CN 203013569 U CN203013569 U CN 203013569U CN 201220736797 CN201220736797 CN 201220736797 CN 201220736797 U CN201220736797 U CN 201220736797U CN 203013569 U CN203013569 U CN 203013569U
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- tension fuse
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Abstract
The utility model discloses a display used for a high voltage fuse capable of easily confirming an opening state of the high voltage fuse provided with a closed cover part. The display (70) can be used for the high voltage fuse (1), which is provided with a cylindrical main body insulator (10). An upper part of the main body insulator (10) is fixedly provided with an upper part electrode, and a side surface of a lower part of the main body insulator (10) is fixedly provided with a lower part electrode (34). The display (70) is provided with a cylindrical part (71), which is inserted in an opening/closing part (56) of the closed cover part (55) of a closing cover of a lower end opening part (14) of the main body insulator (10), and can be exposed from the closed cover part (55); a lower part flange part (72), which is disposed on a lower part of the cylindrical part (71) and abuts against the lower end of the closed cover part (55). The display (70) is disposed on the high voltage fuse (1) to replace a fuse cylinder (40), therefore the opening state can be easily confirmed.
Description
Technical field
The utility model relates to the high-tension fuse display of the open state that shows high-tension fuse.
Background technology
In the past, known promising protection power distribution transformer arranged, was taking in the high-tension fuse of fuse cylinder in porcelain main body insulator processed.Be provided with upper electrode and lower electrode in this high-tension fuse.The fuse cylinder is connected upper electrode with lower electrode.In the upper end of fuse cylinder, be provided with the insulating cylinder that is fixed with the tubular upper contact.In insulating cylinder, run through that the bottom contact with ring-type contact site being installed.Lower end at insulating cylinder is fixed with display barrel.Be provided with between bottom contact and display barrel and suppress parts.In insulating cylinder, be provided with fuse by suppressing the parts stretching between top contact and bottom contact.The electrical fuse element of fuse and fuse lead-in wire are cascaded.Front end at the fuse lead-in wire is provided with splicing ear.On the fixed part that is arranged on the contact of bottom, splicing ear has been fixedly clamped.Be fixed wtih the cover that closes of round-ended cylinder shape in the lower ending opening section of main body insulator.Be provided with the opening/closing portion that can insert the fuse cylinder in the bottom, lower end of closing cover.
The patent documentation 1:ZL patent No. 201120493783.3
In the past, whether operator was in open state from the below of high-tension fuse with the Visual Confirmation high-tension fuse.But, in the high-tension fuse that closes cover is installed, because being difficult to see, the existence of closing cover has or not the fuse cylinder, be difficult to confirm open state.Therefore, in the high-tension fuse that closes cover is installed, wish to occur a kind of high-tension fuse display that can easily confirm open state.
The utility model content
The utility model is In view of the foregoing made, and its purpose is, in the high-tension fuse that closes cover is installed, provides a kind of high-tension fuse display that can easily confirm open state.
The following describes be used to the mechanism that realizes above-mentioned purpose and action effect thereof.
In order to solve above-mentioned problem, a kind of high-tension fuse display is provided, this high-tension fuse is used to high-tension fuse with display, described high-tension fuse possesses main body insulator cylindraceous, top at described main body insulator is fixed with upper electrode, and the lower side at described main body insulator is fixed with lower electrode, described high-tension fuse is standby with displaying appliance: cylindrical portion, insert from the opening/closing portion that closes cover with the lower ending opening section capping of described main body insulator, expose from the described cover that closes; And lower flange section, be arranged on the bottom of described cylindrical portion, with the described lower end butt that closes cover.
According to this structure, the fuse cylinder is being extracted and when making high-tension fuse be in open state from the main body insulator, high-tension fuse is installed on the main body insulator with display, and high-tension fuse is standby with displaying appliance: be inserted in the main body insulator and the cylindrical portion of exposing from closing cover; And with the lower flange section of the lower end butt that closes cover.Therefore, the bottom of cylindrical portion and lower flange section expose from the cover that closes of the high-tension fuse that is in open state, even be provided with the high-tension fuse that closes cover, also can easily confirm open state.
With in display, preferably the leading section in described cylindrical portion is provided with the front end boss section that engages with described lower electrode at above-mentioned high-tension fuse.
According to this structure, be provided with front end boss section at the leading section of cylindrical portion.Therefore, when high-tension fuse was installed on high-tension fuse with display, front end boss section engaged with lower electrode, and high-tension fuse positively is fixed on high-tension fuse with display.
With in display, preferably the leading section in described front end boss section is provided with rake at above-mentioned high-tension fuse, and the diameter of described rake is along with enlarging towards the below from front end.
According to this structure, the leading section of front end boss section be provided with diameter along with from front end towards below become large rake.Therefore, in the time of in high-tension fuse is inserted into high-tension fuse with display, by the rake of front end boss section, make the enlarged-diameter of lower electrode, front end boss section engages with lower electrode, so easily install.
With in display, preferably the central portion in described cylindrical portion is provided with the central flange section that engages with the described described opening/closing portion that closes cover at above-mentioned high-tension fuse.
According to this structure, be provided with central flange section at the central portion of cylindrical portion.Therefore, in the time of in high-tension fuse is inserted into high-tension fuse with display, central flange section engages with the opening/closing portion that closes cover, can suppress high-tension fuse and come off with display.
With in display, preferably the upper surface in described lower flange section is provided with floor at above-mentioned high-tension fuse, and described floor is fitted in the joint-cutting that is arranged on the described opening/closing portion that closes cover.
According to this structure, be provided with floor at the upper surface of lower flange section.Therefore, in the time of in high-tension fuse is inserted into high-tension fuse with display, floor is chimeric with the joint-cutting of the opening/closing portion that closes cover, thereby can prevent that high-tension fuse from rotating with display.
Use in display at above-mentioned high-tension fuse, preferably be provided with engaging protrusion on the described lower flange of the ratio section position on the lower of described cylindrical portion, described engaging protrusion engage with the hook stick that uses when the fuse cylinder being installed on described main body insulator, described fuse cylinder with described upper electrode be connected the lower electrode connection.
According to this structure, be provided with the engaging protrusion that engages with hook stick on cylindrical portion.Therefore, when being installed to high-tension fuse on display high-tension fuse, hook stick is engaged with engaging protrusion, thus can by hook stick keeping clear of to the high pressure fuse away from the position install, operator can carry out operation safely.
With in display, preferably be provided with stage portion, the front end of described hook stick and described stage portion butt at above-mentioned high-tension fuse between the described lower flange section of described cylindrical portion and described engaging protrusion.
According to this structure, be provided with stage portion between the lower flange section of cylindrical portion and engaging protrusion.Therefore, can high-tension fuse positively be installed on hook stick with display by engaging protrusion and stage portion.
The utility model effect
According to the utility model, in being installed, the high-tension fuse that closes cover can easily confirm open state.
Description of drawings
Fig. 1 means the cutaway view of the formation of high-tension fuse.
Fig. 2 means the high-tension fuse that is arranged on the high-tension fuse half sectional view of the formation of display.
Fig. 3 means the high-tension fuse stereogram of the formation of display.
Fig. 4 means the high-tension fuse that is arranged on the high-tension fuse half sectional view of the formation of display.
Fig. 5 means the high-tension fuse stereogram of the formation of display.
Symbol description
1 ... high-tension fuse, 10 ... the main body insulator, 11 ... upper chambers, 12 ... bottom compartment, 12a ... inwall, 13 ... the upper end, 14 ... lower ending opening section, 15 ... lower sides, 16 ... fine protrusions, 17 ... adhesive, 18 ... the insulation pleat, 21 ... the upper mould cone, 23 ... upper electrode, 24 ... arc-extinguishing stick, 31 ... the lower die cone, 34 ... lower electrode, 35 ... the extinguishing arc cylinder, 37 ... the lower electrode sheet, 39 ... liner, 40 ... the fuse cylinder, 41 ... the top contact, 42 ... insulating cylinder, 42b ... external thread part, 43 ... retaining element, 43a ... the lower end, 44 ... fuse, 44a ... portion of terminal, 45 ... electrical fuse element, 46 ... the fuse lead-in wire, 46a ... splicing ear, 47 ... the bottom contact, 47a ... contact site, 47b ... fixed part, 48 ... display barrel, 49 ... spring, 50 ... trip bolt, 51 ... flange part, 52,53 ... the engaging protuberance, 55 ... close cover, 55a ... flange part, 55b ... teat, 56 ... opening/closing portion, 56a ... joint-cutting, 56b ... section, 60 ... protuberance, 70 ... display, 71 ... cylindrical portion, 72 ... lower flange section, 73 ... engaging protrusion, 74 ... stage portion, 75 ... front end boss section, 76 ... rake, 77 ... central flange section, 78 ... floor, D1 ... the external diameter of lower flange section, D2 ... the internal diameter of teat.
Embodiment
(the 1st execution mode)
Illustrate 1st execution mode of high-tension fuse with concreteization of display below with reference to Fig. 1～Fig. 3.
As shown in Figure 1, the main body insulator 10 of the porcelain system of high-tension fuse 1 forms cylindric.Be formed with a plurality of insulation pleats 18 on the outer peripheral face of main body insulator 10.The lower ending opening of main body insulator 10 forms lower ending opening section 14.The inside of main body insulator 10 is formed with columned upper chambers 11 and columned bottom compartment 12, and bottom compartment 12 is communicated with the bottom of upper chambers 11, and its internal diameter enlarges greatlyr than upper chambers 11.
In high-tension fuse 1, taken in fuse cylinder 40 in the upper chambers 11 in main body insulator 10 and bottom compartment 12.Be provided with upper electrode 23 and lower electrode 34 in high-tension fuse 1.In the upper end 13 of main body insulator 10, pasting conical upper mould cone 21 by adhesive, this upper mould cone 21 is connected with upper electrode 23.The external cable that is connecting distribution line on the lead-out wire of upper mould cone 21.In addition, on the lower sides 15 of main body insulator 10, pasting conical lower die cone 31 by adhesive, this lower die cone 31 is connected with lower electrode 34.On the lead-out wire of lower die cone 31, connecting the machines such as transformer that are located on distribution line by external cable.
Front end at fuse lead-in wire 46 is provided with splicing ear 46a.On the fixed part 47b that is arranged on bottom contact 47, with the trip bolt 50 splicing ear 46a that is being fixedly clamped.The top contact 41 of fuse cylinder 40 and bottom contact 47 are by electrical fuse element 45 and 46 electrical connections of fuse lead-in wire.Electrical fuse element 45 fuses when one has the electric current of overrate to flow through at once.On fuse cylinder 40 around extinguishing arc cylinder 35 cylindraceous is installed.On upper electrode 23, be equipped with the arc-extinguishing stick 24 that is formed by arc suppressions such as polyformaldehyde.
On lower electrode 34, be provided with the lower electrode sheet 37 of a plurality of leaf-spring-like.The elastic force pressure of contact site 47a by lower electrode sheet 37 that is arranged on the bottom contact 47 of fuse cylinder 40 kept by the mode of this lower electrode sheet 37 with clamping.Be provided with resinous liner 39 above lower electrode 34.
Be fixed with adhesive 17 on the inwall 12a of the bottom compartment 12 of main body insulator 10 and close cover 55, this closes cover 55 with lower ending opening section 14 cappings of main body insulator 10.Close cover 55 and formed the round-ended cylinder shape by elastomeric elements such as the elastomeric material of flame retardancy or soft synthetic resins.Central authorities at the above-below direction of the outer peripheral face that closes cover 55 are formed with flange part 55a, and this flange part 55a is outstanding and in all-round formation to radial outside.In addition, with the inwall 12a that closes the opposed bottom compartment 12 of cover 55 on, be formed with fine protrusions 16.Fine protrusions 16 is to form by the fragment that is fixedly mounted with insulator on the inwall 12a of bottom compartment 12.
In the time of on closing cover 55 and be installed to the lower ending opening section 14 of main body insulator 10, after the inwall 12a of bottom compartment 12 coating adhesive 17, be installed on the bottom compartment 12 of main body insulator 10 closing cover 55.When carrying out this installation, the upper surface by making the flange part 55a that closes cover 55 and the lower surface butt of main body insulator 10 determine to close the installation site of cover 55.Closing the adhesive 17 of the scheduled amount in gap between the inwall 12a of bottom compartment 12 of the outer peripheral face of cover 55 and main body insulator 10 fills and leads up.Thus, close on the inwall 12a of bottom compartment 12 that cover 55 is packed in main body insulator 10, bottom compartment 12 is capped.At this moment, close cover 55 more outstanding than the lower ending opening section 14 of main body insulator 10.
In addition, be provided with radial joint-cutting 56a in the bottom of closing cover 55, form thus opening/closing portion 56.Opening/closing portion 56 fuse cylinder 40 grades by in open based on joint-cutting 56a, fuse cylinder 40 grades by after close.Opening/closing portion 56 formed by elastomeric element owing to closing cover 55, so can open and close by strain.Be formed with teat 55b cylindraceous in the lower end of closing cover 55.
Under fuse cylinder 40 was inserted into state in main body insulator 10, top contact 41 can contact with upper electrode 23 with switching on, and bottom contact 47 can contact with lower electrode 34 with switching on.That is to say, under fuse cylinder 40 was incorporated in state in main body insulator 10, upper electrode 23 and lower electrode 34 were by 40 electrical connections of fuse cylinder.
Be formed with flange part 51 on the side face of the bottom of bottom contact 47.On the periphery of the lower end of bottom contact 47, be formed with a pair of outstanding engaging protuberance 52,53 that is arranged on 180 degree rightabouts.That is to say, engaging protuberance 52,53 is respectively formed at across the central shaft of bottom contact 47 and on symmetrical position.The engaging protuberance 52 of face side be positioned at groove 54 near.
Be provided with the protuberance 60 more outstanding than the lower end of display barrel 48 in the bottom of insulating cylinder 42.
Hook stick is the rod that uses when being installed to fuse cylinder 40 on main body insulator 10, by with fuse cylinder 40 engage protuberance 52,53 engagings, thereby fuse cylinder 40 is fixing, fuse cylinder 40 is inserted in main body insulator 10.
As shown in Figures 2 and 3, display 70 is installed in high-tension fuse 1, when high-tension fuse 1 was in the open state that fuse cylinder 40 is extracted, display 70 showed open state.The top of display 70 substitutes fuse cylinder 40 and is inserted in main body insulator 10.In addition, the bottom of display 70 is exposed to the outside of main body insulator 10.Display 70 integral body are formed by resin material, and are good in order to make from the Visual Confirmation on ground, and display 70 is painted to the colors such as yellow.
Be provided with the front end boss section 75 that engages with lower electrode 34 on the upper end of cylindrical portion 71.Front end boss section 75 is by lower electrode 34 clampings, so display 70 is maintained on high-tension fuse 1.In addition, be provided with rake 76 at the leading section of front end boss section 75, the diameter of rake 76 is along with become large towards the below from front end.Rake 76 by front end boss section 75 makes lower electrode 34 hole enlargements, and front end boss section 75 engages with lower electrode 34, so display 70 can be easily mounted on high-tension fuse 1.
As shown in Figure 2, under fuse cylinder 40 was installed to state on high-tension fuse 1, the front end of the cylindrical portion 71 of display 70 and fuse cylinder 40 butts were so can not insert display 70.Thus, can not be installed at fuse cylinder 40 display 70 is installed under the state of high-tension fuse 1.
According to execution mode described above, can bring into play following effect.
(1) extract fuse cylinder 40 and when making high-tension fuse 1 be in open state from main body insulator 10, display 70 can be installed on main body insulator 10, display 70 possesses: be inserted in main body insulator 10 and the cylindrical portion 71 of exposing from closing cover 55; With with the lower flange section 72 of the lower end butt that closes cover 55.Therefore, the bottom of cylindrical portion 71 and lower flange section 72 expose from the cover 55 that closes of the high-tension fuse 1 that is in open state, even be provided with the high-tension fuse 1 that closes cover 55, also can easily confirm open state.
(2) be provided with the engaging protrusion 73 that engages with hook stick on cylindrical portion 71.Therefore, when being installed to display 70 on high-tension fuse 1, hook stick is engaged on engaging protrusion 73, thus can by hook stick keeping clear of to high pressure fuse 1 away from the position install, operator can carry out operation safely.
(3) be provided with stage portion 74 between the lower flange section 72 of cylindrical portion 71 and engaging protrusion 73.Therefore, by engaging protrusion 73 and stage portion 74, display 70 can be installed positively on hook stick.
(4) be provided with front end boss section 75 on the leading section of cylindrical portion 71.Therefore, when display 70 was installed on high-tension fuse 1, front end boss section 75 engaged with lower electrode 34, and display 70 positively is fixed on high-tension fuse 1.
(5) the leading section of front end boss section 75 be provided with diameter along with from front end towards below become large rake 76.Therefore, in the time of in display 70 is inserted into high-tension fuse 1, make the enlarged-diameter of lower electrode 34 by the rake 76 of front end boss section 75, front end boss section 75 is engaged on lower electrode 34, so easily install.
(the 2nd execution mode)
Illustrate 2nd execution mode of high-tension fuse with concreteization of display below with reference to Fig. 3 and Fig. 4.The high-tension fuse of present embodiment is with the difference of display and above-mentioned the 1st execution mode, and cylindrical portion 71 is short, is provided with central flange section 77, is provided with floor 78 in lower flange section 72, and stage portion 74 is omitted.The below by with the difference of the 1st execution mode centered by describe.
As shown in Figures 3 and 4, be provided with at the central portion of cylindrical portion 71 the central flange section 77 that engages with the opening/closing portion 56 that closes cover 55.Insert the front end of section 56b of the opening/closing portion 56 of rolling up and the lower surface butt of central flange section 77 from the opening/closing portion 56 that closes cover 55 because of cylindrical portion 71.Therefore, display 70 is kept by the section 56b of opening/closing portion 56.
Upper surface in lower flange section 72 is provided with OBL floor 78, and floor 78 is with to be arranged on the joint-cutting 56a that closes on cover 55 chimeric.Floor 78 amounts to 4 uniformly-spaced to be provided with on the upper surface of lower flange section 72.Floor 78 is chimeric with the joint-cutting 56a of the opening/closing portion 56 that closes cover 55, thereby can prevent display 70 rotations.
As shown in Figure 3, under fuse cylinder 40 was installed to state on high-tension fuse 1, the front end of the cylindrical portion 71 of display 70 and fuse cylinder 40 butts were so can not insert display 70.Thus, can not occur in fuse cylinder 40 and be installed in the situation that display 70 is installed under state on high-tension fuse 1.
According to execution mode described above, reach the effect of (2) except (1) of the 1st execution mode, can also bring into play following effect.
(6) be provided with central flange section 77 at the central portion of cylindrical portion 71.Therefore, when being inserted into display 70 in high-tension fuse 1, central flange section 77 engages with the opening/closing portion 56 that closes cover 55 and can suppress display 70 and comes off.
(7) be provided with floor 78 on the upper surface of lower flange section 72.Therefore, in the time of in display 70 is inserted into high-tension fuse 1, floor 78 is chimeric with the joint-cutting 56a of the opening/closing portion 56 that closes cover 55, thereby can prevent display 70 rotations.
In addition, above-mentioned execution mode can also adopt the following mode of carrying out suitably change to implement.
In the above-described embodiment, with display 70 integral colourings, yet the part of exposing to the outside in the time of also can only being installed to display 70 on high-tension fuse 1 is painted.In addition, can be only that lower flange section 72 is painted.The painted yellow that is not limited to can suitably change.Also can by paste painted bring carry out painted.
Also can in the lower flange section 72 of above-mentioned the 1st execution mode, with the 2nd execution mode, floor 78 be set similarly.
In the above-described embodiment, be provided with 4 floors 78, yet the quantity of floor 78 can be according to the reasonable quantity change of the joint-cutting 56a of the opening/closing portion 56 that closes cover 55.
Also can be on the cylindrical portion 71 of above-mentioned the 1st execution mode, with the 2nd execution mode, central flange section 77 is set similarly.
Also can pleat be set at the outer surface from the front end boss section 75 of cylindrical portion 71 to lower flange section 72 of above-mentioned the 1st execution mode.By pleat is set, can extend creepage distance.
Also the lower flange section 72 of above-mentioned execution mode can be set for and can move with respect to cylindrical portion 71.
In the above-described embodiment, on engaging protrusion 73, hook stick has been installed, however also can be on engaging protrusion 73 the mounting knob parts.
In the above-described embodiment, be provided with OBL floor 78, yet the floor 78 of triangle column also can be set.
In above-mentioned the 1st execution mode, be provided with rake 76 in front end boss section 75, yet as long as front end boss section 75 can engage with lower electrode 34, also can be with rake 76 omissions.
In above-mentioned the 1st execution mode, be provided with front end boss section 75 at the leading section of cylindrical portion 71, yet if need not to engage with lower electrode 34, also front end boss section 75 can be omitted.
In the above-described embodiment, be provided with engaging protrusion 73 in the bottom of cylindrical portion 71, yet if need not to be installed on hook stick, also engaging protrusion 73 can be omitted.
Claims (7)
1. a high-tension fuse display, is characterized in that,
Described high-tension fuse is used to high-tension fuse with display, and described high-tension fuse possesses main body insulator cylindraceous, is fixed with upper electrode on the top of described main body insulator, and described main body insulator lower side be fixed with lower electrode,
Described high-tension fuse is standby with displaying appliance:
Cylindrical portion is inserted from the opening/closing portion that closes cover with the lower ending opening section capping of described main body insulator, exposes from the described cover that closes; And
Lower flange section is arranged on the bottom of described cylindrical portion, with the described lower end butt that closes cover.
2. high-tension fuse display according to claim 1, is characterized in that,
Leading section in described cylindrical portion is provided with the front end boss section that engages with described lower electrode.
3. high-tension fuse display according to claim 2, is characterized in that,
Leading section in described front end boss section is provided with rake, and the diameter of described rake is along with enlarging towards the below from front end.
4. high-tension fuse display according to claim 1, is characterized in that,
Central portion in described cylindrical portion is provided with the central flange section that engages with the described described opening/closing portion that closes cover.
5. high-tension fuse display according to claim 4, is characterized in that,
Upper surface in described lower flange section is provided with floor, and described floor is fitted in the joint-cutting that is arranged on the described opening/closing portion that closes cover.
6. the described high-tension fuse display of according to claim 1～5 any one, is characterized in that,
Be provided with engaging protrusion on the described lower flange of the ratio section position on the lower of described cylindrical portion, described engaging protrusion engage with the hook stick that uses when the fuse cylinder being installed on described main body insulator, described fuse cylinder with described upper electrode be connected the lower electrode connection.
7. high-tension fuse display according to claim 6, is characterized in that,
Be provided with stage portion, the front end of described hook stick and described stage portion butt between the described lower flange section of described cylindrical portion and described engaging protrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220736797 CN203013569U (en) | 2012-12-06 | 2012-12-06 | Display used for high voltage fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220736797 CN203013569U (en) | 2012-12-06 | 2012-12-06 | Display used for high voltage fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203013569U true CN203013569U (en) | 2013-06-19 |
Family
ID=48605136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220736797 Expired - Fee Related CN203013569U (en) | 2012-12-06 | 2012-12-06 | Display used for high voltage fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203013569U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952134A (en) * | 2020-07-28 | 2020-11-17 | 湖南特诚成套电器有限公司 | Self-alarming injection type high-voltage fuse |
-
2012
- 2012-12-06 CN CN 201220736797 patent/CN203013569U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952134A (en) * | 2020-07-28 | 2020-11-17 | 湖南特诚成套电器有限公司 | Self-alarming injection type high-voltage fuse |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20201206 |
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| CF01 | Termination of patent right due to non-payment of annual fee |