WO2009005740A1 - Additional indicador for dropout fuse - Google Patents
Additional indicador for dropout fuse Download PDFInfo
- Publication number
- WO2009005740A1 WO2009005740A1 PCT/US2008/008060 US2008008060W WO2009005740A1 WO 2009005740 A1 WO2009005740 A1 WO 2009005740A1 US 2008008060 W US2008008060 W US 2008008060W WO 2009005740 A1 WO2009005740 A1 WO 2009005740A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuse assembly
- collar
- fuse
- marked area
- color
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
- H01H31/12—Adaptation for built-in fuse
- H01H31/122—Fuses mounted on, or constituting the movable contact parts of, the switch
- H01H31/127—Drop-out fuses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
- H01H85/303—Movable indicating elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/18—Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks
- H01H9/181—Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks using a programmable display, e.g. LED or LCD
Definitions
- This invention relates to voltage power distribution systems and ticularly to an apparatus having improved visualization of fault conditions
- Cut-out protective devices are well known in the art and have been used for many years in the domestic electricity distribution grid. Cut-outs incorporate a fuse element between a high voltage power line and a downstream grid, transformer, or the like. Typically, the cut-out is mounted to a utility pole and includes an insulator electrically isolating upper and lower terminals that electrically couple to the respective input and output power lines.
- a cylindrical fuse carrier typically includes an arc reducing liner and the fuse element and is pivotally secured proximate to the bottom terminal.
- the fuse carrier When the fuse carrier is swung upwardly it is received in the resilient upper coupler of the upper terminal. In this manner, the fuse element extends parallel to the insulator and, under normal conditions, electrically connects the top and bottom terminals.
- the fuse element When a current overload or fault condition occurs, the fuse element is destroyed, breaking the electrical connection between the upper and lower terminal assemblies. Somewhat simultaneously, the fuse carrier disengages from the upper terminal assembly and swings downwardly. Thereafter, the fuse carrier remains in an open, hanging position to visually indicate to a utility worker where the open fuse is located. The utility worker may thereafter replace the fuse and swing the fuse carrier upwardly until it is again received in the resilient upper coupler of the upper terminal.
- a fuse assembly in accordance with the present invention is adapted for an electrical cut-out including an upper terminal and a lower terminal spaced by an insulator.
- the fuse assembly includes a cylindrical portion having an outer surface, an upper contact end positioned at the top of the cylindrical portion and a lower contact end positioned at the bottom of the cylindrical portion and adapted to be pivotally carried by the lower terminal.
- a collar is positioned on the cylindrical portion and is adapted to slide thereon.
- a portion of the outer surface includes a marked area and when the upper contact end is secured to the upper terminal, the collar covers the marked area. When the upper contact end is detached from the upper terminal, the marked area is exposed.
- an indicator arrangement is adapted for use with an electrical cut-out having an upper terminal and a lower terminal spaced by an insulator and a fuse assembly having a fuse element, wherein the fuse assembly includes an upward, engaged position whereby the electrical circuit is closed and a downward, disengaged position whereby the electric circuit is open.
- the indicator arrangement includes a surface on the fuse assembly including a marked area and an unmarked area.
- a collar is movably carried by the fuse assembly. The collar covers the marked area when the fuse assembly is in the engaged position and when the fuse assembly is in the disengaged position the collar covers the unmarked area.
- Figure 1 is a perspective view of the cut-out according to the present invention.
- Figure 2 is a side view of the cut-out with the fuse assembly in the operative engaged position.
- Figure 3 is a side view of the electrical cutout with the fuse assembly pivotally swinging down into an inoperative disengaged position.
- an electrical cutout is generally indicated by the numeral 10.
- a high voltage power line or electrical cable 12 is secured to an upper line terminal assembly 14 (hereinafter upper terminal) and a lower line terminal assembly 16 (hereinafter lower terminal).
- Upper and lower terminals 12 and 14 are spaced by an insulator 18 and a fuse assembly 20.
- Insulator 18 has an elongated central stem portion 22 defining a longitudinal direction, and a plurality of longitudinally spaced apart skirts 24 extending from stem portion 22.
- Upper terminal 14 includes an upper bracket 26 secured to a top end 27 of insulator 18 with screws 28.
- Upper terminal 14 further includes an upper clamp assembly 30 having clips 32 for attaching the electrical cables 12 thereto.
- Upper bracket 26 includes guide members 34a and 34b adapted to guide fuse assembly 20 into proper engagement with upper terminal 14.
- Lower terminal 16 is attached to the bottom end 36 of insulator 18 by a lower bracket 38 that includes braces 40 for engaging and supporting fuse assembly 20.
- Lower terminal 16 further includes a lower clamp assembly 42 that includes clips 44 for attaching the electrical cables 12 thereto.
- a middle bracket 46 Attached to a cut-away middle portion of the insulator 18 is a middle bracket 46 that is adapted to couple to a power line pole or electrical cable pole or the like.
- Fuse assembly 20 is pivotally mounted in the engaging braces 40 of the lower bracket 38 for pivotal movement between an operative position and an inoperative position. While in the operative position, fuse assembly 20 engages and electrically closes an upper contact 48 on upper clamp assembly 30 and a lower contact 50 (shown in Fig. 1) on lower clamp assembly 42. In an inoperative position upper and lower contacts 48 and 50 are electrically open (shown in Fig. 3).
- Fuse assembly 20 includes an upper contact end 52 and a lower contact end 54.
- Fuse assembly 20 also has a circular ring member 56 located near the upper contact end 52 for inserting a hot stick used by a utility company lineman. The hot stick allows the lineman to open the electrical connection thereby allowing the lineman to safely replace the fuse assembly 20.
- the upper contact end 52 is guided into an engaged position by guide members 34a and 34b attached to upper bracket 26 of upper terminal 14.
- Lower contact end 54 of fuse assembly 20 is pivotally mounted to lower terminal 16 by a transverse shaft member 58.
- Fuse assembly includes a fuse element 60 that extends between the upper and lower contacts 48 and 50.
- fuse element 60 includes a fuse element line that extends the approximate length of the fuse element and across lower contact end 54.
- Fuse assembly 20 further includes an indicator arrangement generally indicated by the numeral 70.
- Indicator arrangement 70 includes a cylindrical collar 72 that is received over fuse element 60 for sliding engagement thereon.
- collar 72 includes a central bore 74 having a diameter slightly larger than the outer diameter of fuse element 60.
- Collar 72 is longitudinally shorter than fuse element 60 so that a surface 73 of fuse element 60 is visible when fuse assembly 20 is in the upright position.
- the color of collar 72 may be the same as the color as surface 73.
- collar 72 may be composed of a polymer material. It should also be appreciated that, though the present embodiment discloses a cylindrical collar, other shapes may be employed depending upon the shape of fuse element 60 and overall size requirements.
- Indicator arrangement 70 further includes a marked area 76 (see Fig. 3) in the form of a painted or otherwise coated portion of fuse element 60. Marked area 76 creates a different visual appearance than surface 73.
- the paint or coating may be a phosphorescent material. In these or other embodiments the paint or coating material may be reflective. In still other embodiments, the paint or coating may include a red or a yellow color. The coatings and/or paints employed should be bright and easily visible, particularly at night.
- the size of marked area 76 is such that collar 72 substantially covers it when fuse assembly 20 is in the upright position. In other words, collar 72 rests proximate to lower contact end 54 during normal/upright operation and thus, marked area 76 is proximate to lower contact end 54.
- fuse assembly 20 is in the engaged/upright position.
- a high power surge comes down the electrical cables 12 onto the upper terminal 14, it crosses the upper contact end 52 of the fuse assembly 20 and blows the fuse element 60.
- the fuse element 60 releases the engaging pressure on the upper contact 48 by released tension on the fuse element line.
- the released tension causes fuse assembly 20 to slightly drop vertically downward, and the upper contact end 52 of fuse assembly 20 then swings outward and down to a disengaged and electrically open position as shown in FIG. 3.
- collar 72 likewise will slide longitudinally along fuse element 60 toward upper contact end 52. As shown in Fig. 3, collar 72 eventually engages or abuts against ring member 56 to prevent further sliding movement. At this time, marked area 76 is exposed so that the paint or coating is visible to a utility worker. In this manner, the failed fuse assembly is more visible to utility workers attempting to locate the fault. This enables more rapid repair service, particularly at night or during inclement weather.
- cut-out represents just one example of a cut-out wherein the indicator arrangement of the present invention may be employed.
- the indicator arrangement of the present invention may be employed in any electricity distribution equipment wherein a pivoting fuse element indicates fault. Further details of electric cut-outs may be found with reference to U.S. Patent No. 3,868,615, U.S. Patent No. 4,947,148 and U.S. Patent No. 5,300,912 which are hereby incorporated by reference.
Landscapes
- Fuses (AREA)
Abstract
The fuse assembly is used in an electrical cut-out having an upper terminal and a lower terminal spaced by an insulator. The fuse assembly includes a cylindrical portion having an outer surface. An upper contact end is positioned at the top of the cylindrical portion. A lower contact end is positioned at the bottom of the cylindrical portion and is adapted to be pivotally carried by the lower terminal. A collar is positioned on the cylindrical portion and is adapted to slide thereon. A portion of the outer surface includes a marked area and when the upper contact end is secured to the upper terminal, the collar covers the marked area. When the upper contact end is detached from the upper terminal, the marked area is exposed.
Description
ADDITIONAL INDICADOR FOR DROPOUT FUSE
FIELD OF THE INVENfTION
This invention relates to voltage power distribution systems and ticularly to an apparatus having improved visualization of fault conditions
BACKGROUND
Cut-out protective devices are well known in the art and have been used for many years in the domestic electricity distribution grid. Cut-outs incorporate a fuse element between a high voltage power line and a downstream grid, transformer, or the like. Typically, the cut-out is mounted to a utility pole and includes an insulator electrically isolating upper and lower terminals that electrically couple to the respective input and output power lines.
A cylindrical fuse carrier typically includes an arc reducing liner and the fuse element and is pivotally secured proximate to the bottom terminal. When the fuse carrier is swung upwardly it is received in the resilient upper coupler of the upper terminal. In this manner, the fuse element extends parallel to the insulator and, under normal conditions, electrically connects the top and bottom terminals.
When a current overload or fault condition occurs, the fuse element is destroyed, breaking the electrical connection between the upper and lower terminal assemblies. Somewhat simultaneously, the fuse carrier disengages from the upper terminal assembly and swings downwardly. Thereafter, the fuse carrier remains in an open, hanging position to visually indicate to a utility worker where the open fuse is located. The utility worker may thereafter replace the fuse and swing the fuse carrier upwardly until it is again received in the resilient upper coupler of the upper terminal.
Though the above discussed design is widely used, drawbacks persist. In particular, destruction of the fuse element often occurs during adverse weather conditions by, for example, lightning or downed tree limbs. During such times visibility is greatly restricted due to wind, rain, snow or debris. Thus, even though the fuse carrier visually indicates fault when in the hanging position, it still may not be visible enough to utility workers during inclement weather or at night. There is therefore a need in the art to increase the visibility of fuse assemblies while in the open position.
SUMMARY OF THE INVENTION
In general, a fuse assembly in accordance with the present invention is adapted for an electrical cut-out including an upper terminal and a lower terminal spaced by an insulator. The fuse assembly includes a cylindrical portion having an outer surface, an upper contact end positioned at the top of the cylindrical portion and a lower contact end positioned at the bottom of the cylindrical portion and adapted to be pivotally carried by the lower terminal. A collar is positioned on the cylindrical portion and is adapted to slide thereon. A portion of the outer surface includes a marked area and when the upper contact end is secured to the upper terminal, the collar covers the marked area. When the upper contact end is detached from the upper terminal, the marked area is exposed.
In accordance with another aspect of the present invention, an indicator arrangement is adapted for use with an electrical cut-out having an upper terminal and a lower terminal spaced by an insulator and a fuse assembly having a fuse element, wherein the fuse assembly includes an upward, engaged position whereby the electrical circuit is closed and a downward, disengaged position whereby the electric circuit is open. The indicator arrangement includes a surface on the fuse assembly including a marked area and an unmarked area. A collar is movably carried by the fuse assembly. The collar covers the marked area when the fuse assembly is in the engaged position and when the fuse assembly is in the disengaged position the collar covers the unmarked area.
A preferred exemplary indicator arrangement made in accordance with the concepts of the present invention is shown by way of example in the accompanying drawings without attempting to show all the various forms and modifications in which the invention might be embodied, the invention being measured by the appended claims and not by the details of the specification.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of the cut-out according to the present invention.
Figure 2 is a side view of the cut-out with the fuse assembly in the operative engaged position.
Figure 3 is a side view of the electrical cutout with the fuse assembly pivotally swinging down into an inoperative disengaged position.
DETAILED DESCRIPTION
The present invention will be described with reference to the accompanying drawings. Referring to Figs. 1 and 2, an electrical cutout is generally indicated by the numeral 10. A high voltage power line or electrical cable 12 is secured to an upper line terminal assembly 14 (hereinafter upper terminal) and a lower line terminal assembly 16 (hereinafter lower terminal). Upper and lower terminals 12 and 14 are spaced by an insulator 18 and a fuse assembly 20.
Insulator 18 has an elongated central stem portion 22 defining a longitudinal direction, and a plurality of longitudinally spaced apart skirts 24 extending from stem portion 22. Upper terminal 14 includes an upper bracket 26 secured to a top end 27 of insulator 18 with screws 28. Upper terminal 14 further includes an upper clamp assembly 30 having clips 32 for attaching the electrical cables 12 thereto. Upper bracket 26 includes guide members 34a and 34b adapted to guide fuse assembly 20 into proper engagement with upper terminal 14.
Lower terminal 16 is attached to the bottom end 36 of insulator 18 by a lower bracket 38 that includes braces 40 for engaging and supporting fuse assembly 20. Lower terminal 16 further includes a lower clamp assembly 42 that includes clips 44 for attaching the electrical cables 12 thereto.
Attached to a cut-away middle portion of the insulator 18 is a middle bracket 46 that is adapted to couple to a power line pole or electrical cable pole or the like. Fuse assembly 20 is pivotally mounted in the engaging braces 40 of the lower bracket 38 for pivotal movement between an operative position and an inoperative position. While in the operative position, fuse assembly 20 engages and electrically closes an upper contact 48 on upper clamp assembly 30 and a lower contact 50 (shown in Fig. 1) on lower clamp assembly 42. In an inoperative position upper and lower contacts 48 and 50 are electrically open (shown in Fig. 3).
Referring now to FIGS. 2 and 3, the operation of the fuse assembly 20 is shown in more detail. Fuse assembly 20 includes an upper contact end 52 and a lower contact end 54. Fuse assembly 20 also has a circular ring member 56 located near the upper contact end 52 for inserting a hot stick used by a utility company lineman. The hot stick allows the lineman to open the electrical connection thereby allowing the
lineman to safely replace the fuse assembly 20. The upper contact end 52 is guided into an engaged position by guide members 34a and 34b attached to upper bracket 26 of upper terminal 14. Lower contact end 54 of fuse assembly 20 is pivotally mounted to lower terminal 16 by a transverse shaft member 58. Fuse assembly includes a fuse element 60 that extends between the upper and lower contacts 48 and 50. As is known in the art, fuse element 60 includes a fuse element line that extends the approximate length of the fuse element and across lower contact end 54.
Fuse assembly 20 further includes an indicator arrangement generally indicated by the numeral 70. Indicator arrangement 70 includes a cylindrical collar 72 that is received over fuse element 60 for sliding engagement thereon. To that end, collar 72 includes a central bore 74 having a diameter slightly larger than the outer diameter of fuse element 60. Collar 72 is longitudinally shorter than fuse element 60 so that a surface 73 of fuse element 60 is visible when fuse assembly 20 is in the upright position. In one embodiment, the color of collar 72 may be the same as the color as surface 73. In these or other embodiments, collar 72 may be composed of a polymer material. It should also be appreciated that, though the present embodiment discloses a cylindrical collar, other shapes may be employed depending upon the shape of fuse element 60 and overall size requirements.
Indicator arrangement 70 further includes a marked area 76 (see Fig. 3) in the form of a painted or otherwise coated portion of fuse element 60. Marked area 76 creates a different visual appearance than surface 73. In one embodiment, the paint or coating may be a phosphorescent material. In these or other embodiments the paint or coating material may be reflective. In still other embodiments, the paint or coating may include a red or a yellow color. The coatings and/or paints employed should be bright and easily visible, particularly at night. The size of marked area 76 is such that collar 72 substantially covers it when fuse assembly 20 is in the upright position. In other words, collar 72 rests proximate to lower contact end 54 during normal/upright operation and thus, marked area 76 is proximate to lower contact end 54.
As shown in Fig. 2, during normal operation, fuse assembly 20 is in the engaged/upright position. When a high power surge comes down the electrical cables 12 onto the upper terminal 14, it crosses the upper contact end 52 of the fuse assembly 20 and blows the fuse element 60. The fuse element 60, in turn, releases the engaging pressure on the upper contact 48 by released tension on the fuse element line. The released tension causes fuse assembly 20 to slightly drop vertically downward, and
the upper contact end 52 of fuse assembly 20 then swings outward and down to a disengaged and electrically open position as shown in FIG. 3.
As fuse assembly 20 rotates to the downward/open position, collar 72 likewise will slide longitudinally along fuse element 60 toward upper contact end 52. As shown in Fig. 3, collar 72 eventually engages or abuts against ring member 56 to prevent further sliding movement. At this time, marked area 76 is exposed so that the paint or coating is visible to a utility worker. In this manner, the failed fuse assembly is more visible to utility workers attempting to locate the fault. This enables more rapid repair service, particularly at night or during inclement weather.
It should be appreciated that the above discussed cut-out represents just one example of a cut-out wherein the indicator arrangement of the present invention may be employed. The indicator arrangement of the present invention may be employed in any electricity distribution equipment wherein a pivoting fuse element indicates fault. Further details of electric cut-outs may be found with reference to U.S. Patent No. 3,868,615, U.S. Patent No. 4,947,148 and U.S. Patent No. 5,300,912 which are hereby incorporated by reference.
The presently disclosed embodiments are considered in all respects to be illustrative, and not restrictive. The scope of the invention is indicated by the appended claims.
Claims
1. A fuse assembly for an electrical cut-out including an upper terminal and a lower terminal spaced by an insulator, the fuse assembly comprising; a cylindrical portion having an outer surface; an upper contact end positioned at the top of said cylindrical portion; a lower contact end positioned at the bottom of said cylindrical portion and adapted to be pivotally carried by the lower terminal; a collar positioned on said cylindrical portion and adapted to slide thereon; wherein a portion of said outer surface includes a marked area and when said upper contact end is secured to the upper terminal, said collar covers said marked area and when said upper contact end is detached from the upper terminal, said marked area is exposed.
2. The fuse assembly of claim 1 wherein said cylindrical portion includes a fuse element having a fuse element line therein.
3. The fuse assembly of claim 1 wherein said marked area includes a phosphorescent material.
4. The fuse assembly of claim 1 wherein said marked area includes a reflective material.
5. The fuse assembly of claim 1 wherein said marked area includes red or yellow paint.
6. The fuse assembly of claim 2 wherein said marked area is located proximate to said lower contact end.
7. The fuse assembly of claim 1 wherein said cylindrical portion includes an unmarked area having a color and said collar including a color, said unmarked area color and said collar color being the same.
8. An indicator arrangement for an electrical cut-out having an upper terminal and a lower terminal spaced by an insulator and a fuse assembly having a fuse element, wherein the fuse assembly includes an upward, engaged position whereby the electrical circuit is closed and a downward, disengaged position whereby the electric circuit is open, the indicator arrangement comprising; a surface on the fuse assembly, said surface including a marked area and an unmarked area; a collar movably carried by the fuse assembly; wherein said collar covers said marked area when the fuse assembly is in the engaged position and when the fuse assembly is in the disengaged position said collar covers said unmarked area.
9. The indicator arrangement of claim 8 wherein said marked area includes a phosphorescent material.
10. The indicator arrangement of claim 8 wherein said marked area includes a reflective material.
11. The indicator arrangement of claim 8 wherein said marked area includes red or yellow paint.
12. The indicator arrangement of claim 8 wherein said unmarked area has a color and said collar has a color and said unmarked area color and said collar color being the same.
13. The indicator arrangement of claim 8, said collar including a cylindrical body with a central bore, said bore receiving the fuse element therein.
14. The indicator arrangement of claim 8, wherein said collar is adapted to slide along said fuse assembly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94679507P | 2007-06-28 | 2007-06-28 | |
| US60/946,795 | 2007-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009005740A1 true WO2009005740A1 (en) | 2009-01-08 |
Family
ID=39798181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2008/008060 WO2009005740A1 (en) | 2007-06-28 | 2008-06-27 | Additional indicador for dropout fuse |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2009005740A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356267A (en) * | 2016-11-15 | 2017-01-25 | 国家电网公司 | Falling type fuse |
| CN106571279A (en) * | 2016-11-11 | 2017-04-19 | 国家电网公司 | Drop-out fuse |
| CN107689316A (en) * | 2016-08-06 | 2018-02-13 | 天津中电华利电器科技集团有限公司 | A kind of low-tension fuse alarmed |
| CN109360777A (en) * | 2018-11-01 | 2019-02-19 | 湖南长高思瑞自动化有限公司 | A kind of fuse switch on-line monitoring method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1405716A (en) * | 1973-03-22 | 1975-09-10 | English Electric Co Ltd | Fuselink indicator |
| US4961063A (en) * | 1989-12-11 | 1990-10-02 | Specialized Hunting Equipment | Fuse tube for power and cutout fuses |
| US5191311A (en) * | 1992-06-18 | 1993-03-02 | Firon Metal Industries Ltd. | Switch for use as a vertically mounted cut out or in-line switch |
-
2008
- 2008-06-27 WO PCT/US2008/008060 patent/WO2009005740A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1405716A (en) * | 1973-03-22 | 1975-09-10 | English Electric Co Ltd | Fuselink indicator |
| US4961063A (en) * | 1989-12-11 | 1990-10-02 | Specialized Hunting Equipment | Fuse tube for power and cutout fuses |
| US5191311A (en) * | 1992-06-18 | 1993-03-02 | Firon Metal Industries Ltd. | Switch for use as a vertically mounted cut out or in-line switch |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107689316A (en) * | 2016-08-06 | 2018-02-13 | 天津中电华利电器科技集团有限公司 | A kind of low-tension fuse alarmed |
| CN106571279A (en) * | 2016-11-11 | 2017-04-19 | 国家电网公司 | Drop-out fuse |
| CN106356267A (en) * | 2016-11-15 | 2017-01-25 | 国家电网公司 | Falling type fuse |
| CN106356267B (en) * | 2016-11-15 | 2018-04-10 | 国家电网公司 | A kind of fuse switch |
| CN109360777A (en) * | 2018-11-01 | 2019-02-19 | 湖南长高思瑞自动化有限公司 | A kind of fuse switch on-line monitoring method |
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