CN101290845A - Fasten type high-voltage isolation switch - Google Patents
Fasten type high-voltage isolation switch Download PDFInfo
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- CN101290845A CN101290845A CNA2008100624353A CN200810062435A CN101290845A CN 101290845 A CN101290845 A CN 101290845A CN A2008100624353 A CNA2008100624353 A CN A2008100624353A CN 200810062435 A CN200810062435 A CN 200810062435A CN 101290845 A CN101290845 A CN 101290845A
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Abstract
The invention discloses a clamp type high-voltage isolating switch used in power grid transmission lines. Each phase comprises an insulator, an insulating pull rod, a fixed contact, a left blade, a right blade and a locking mechanism; the middle part of a locking connecting lever is hinged with the left blade and the right blade through a positioning pin shaft; the lower end of the locking connecting lever is hinged with the insulating pull rod, the lower part of the locking connecting lever is provided with a slot, and a positioning pin fixed on the blades on both sides passes through the slot; the upper part of the locking connecting lever is provided with a wedge-shaped head, two steel balls arranged in sleeves of the left blade and the right blade are respectively clung to both sides of the wedge-shaped head, and the other sides of the steel balls are positioned at the inner sides of two magnetic lock plates; the upper part of each blade is provided with a latching connecting lever hinged with the blade, and the latching connecting lever bears a force rotating counterclockwise through a torsional spring; and the upper end of the locking connecting lever is in limit fit with an arc-shaped edge of the lower part of the latching connecting lever. The switch is suitable for voltage classes of 40.5kV and above; when the switch is at the switch-on position, the blades and the fixed contact have big contact pressure; the switch has strong through flow ability, small switch operation force, and reliable switch-on-locking action.
Description
Technical field
The present invention relates to electrical technology field, especially relate to the fasten type high-voltage isolation switch that uses in a kind of electrical network conveying circuit.
Background technology
High voltage isolator is the insulation distance of requirement up to specification to be arranged between contact when the separating brake position and significantly disconnect sign, can carry the switchgear that electric current under the normal loop condition reaches the electric current under the exceptional condition (for example short circuit) at the appointed time when closing position.The form of isolating switch has multiple, in the 12kv electric pressure, GN19 type, GN22 type etc. is arranged typically; In the 40.5kv electric pressure GN19 type, GN27 type etc. are arranged.
Wherein the GN22 type designs in order to reduce operating physical force (when particularly the switch rated current is big), its composition can be divided into underframe, insulator, retaining mechanism and current-carrying part, fix six porcelain insulators on the underframe, form a phase for per two, the three phase isolated pull bar is housed respectively on the connecting lever of rotating shaft, be used for operating the contact knife branch of three-phase, the motion of closing a floodgate, current-carrying part is made up of contact, contact knife and touch base, and elasticity magnetic padlock plate compresses; Rotating shaft rotation makes insulated tension pole on the operation connecting lever haul contact knife to rotate to contact during combined floodgate, and after contact knife entered contact and puts in place, insulated tension pole drove the retaining mechanism action and makes contact knife and contact clamping.The rotating shaft rotation is pushed up the insulated tension pole on the operation connecting lever outward during separating brake, and retaining mechanism is unclamped, and contact knife and contact separate then, and contact knife rotates around touch base, until the separating brake position.It has adopted combined floodgate-locking two-step action to reduce operating physical force: when closing a floodgate, driving shaft is a switching angle rotating precontract 80 degree angles, is used to rotate contact knife, makes the disconnecting link moving contact move to closing position from cut-offfing extreme position; In driving shaft 10 degree angular displacements is contact angle, is used for the retaining mechanism action.By the motion of slide block drivening rod, thereby the both sides push rod is released, the magnetic padlock plate plays lever, is pressed on the contact knife after the thrust of push rod is amplified, and forms contact pressure, and its structure is complicated slightly.
The GN22 type is power system operation more than 10 year, operational reliability is not very desirable, common have spacer pin can not reset in the separating brake process, so that when closing a floodgate next time, slide block does not begin to slide when angles are spent in driving shaft rotation preceding 80 owing to be subjected to the obstruction of spacer pin, and the magnetic padlock plate is in locking state when moving contact does not also insert fixed contact.Under operating personnel close a floodgate the effect of inertia of impulse force, though disconnecting link closes a floodgate and can put in place, has caused the distortion of power transmission shaft, because the stroke of disconnecting link is not enough, cause the contact pressure between dynamic/static contact to significantly reduce, occurred flowing through less electric current and phenomenon that disconnecting link also can generate heat.
Utility model patent ZL200620031085.0 has done improvement to the hold-down mechanism of GN22 type, this patent disclosure a kind of contact knife combined floodgate hold-down mechanism of indoor high-voltage isolating switch, the magnetic padlock plate is fixed on the side of contact knife, between the contact knife of the left and right sides, be fixed with a sliding sleeve thrust structure, sliding sleeve thrust structure is sliding sleeve of suit on the contact knife of the left and right sides, be set with sliding axle, steel ball and push rod successively from middle mind-set both sides in the sliding sleeve, sliding axle is provided with the groove that is complementary with the steel ball cylindrical, and push rod and magnetic padlock plate form interaction face.The lever thrust mechanism replaced the outer spring pressure mechanism in this switch touching knife combined floodgate hold-down mechanism adopted, compact conformation, and it is little to take up room, and the pressure contact-making surface is big, and operational torque is little.
Utility model patent ZL200720034544.5 improves the locking device of GN22 type, this patent disclosure a kind of dropout locking device of device for switching, every longitudinal sliding block that comprises fixed contact, touch base, four magnetic padlock plates, two anti-jam plates, two contact knifes mutually, has release pin, two transverse sliders, pull bar, main shaft connecting lever, sliding sleeve, the centre symmetry line of anti-jam plate and the angle of longitudinal sliding block vertical direction are 3 °～11 °.Adopt such structure, have that release pin on the longitudinal sliding block of release pin forms in the process of motion near track, can not interfered.
In the 40.5kv electric pressure, because the contact knife size that needs is long, if only running part is made amplification design, the movement locus of insulated tension pole is very big, consider the insulation against ground distance, whole switch overall dimension can be very big, thereby the operation principle of GN22 type can not directly be applied in the 40.5kv electric pressure.And traditional GN19 type is replaced by the GN27 type of effort-saving gradually because the operating physical force that needs is excessive, the GN27 type adopts many fingertips of rotary type structure, when installing and using, owing to connected the busbar stress, when if framework and insulator have distortion, usually make the contact loose contact, reliable and stable thereby operation is difficult to guarantee.
Summary of the invention
The invention provides a kind of fasten type high-voltage isolation switch that can be applied to 40.5KV and above electric pressure easily and reliably, this switch contact pressure of contact knife and fixed contact when closing position is big, through-current capability is strong, and switching manipulation power is little, combined floodgate-locking two-step action is reliable, and is low to the requirement of mechanical strength of framework and insulator.
A kind of fasten type high-voltage isolation switch, every insulator, insulated tension pole of comprising mutually, fixed contact, left and right sides contact knife and retaining mechanism, the lower end of contact knife is hinged on the touch base, and the upper end contacts with fixed contact and is communicated with or away from disconnecting two service positions; Retaining mechanism comprises magnetic padlock plate, steel ball, locking connecting lever, upper pin and the lower bearing pin upper end that be positioned at left and right sides contact knife of two magnetic padlock plates by passing left and right sides contact knife, it is characterized in that: described locking connecting lever is installed in the middle of the contact knife of the left and right sides, the middle part of locking connecting lever is hinged by alignment pin and contact knife, the bottom and the insulated tension pole of locking connecting lever are hinged, locking connecting lever bottom has an elongated slot, and an alignment pin that is fixed in the elongated slot on the two side contact knifes passes, the top band one wedge head of locking connecting lever; In described steel ball is installed in respectively and overlaps in the contact knife of the left and right sides; One side of steel ball is attached on this wedge head, and opposite side is attached to magnetic padlock plate inboard; Contact knife top is provided with through lower bearing pin and the hinged snap close connecting lever of contact knife, and a torsion spring one end is against on the upper pin, and the other end is pressed on the snap close connecting lever, makes the snap close connecting lever be subjected to the power of changeing counterclockwise; The top of locking connecting lever cooperates with the circular arc margin position of snap close connecting lever bottom.
In the separating brake position, the spacer pin of locking connecting lever upper end or its upper end is lived by the bottom circular arc side bumper of snap close connecting lever, can not clockwise rotate and static relatively around fixed pin shaft; Snap close connecting lever upper end is subjected to the effect of fixed contact when closing position, overcome the torsion of torsion spring and clockwise rotate, and makes the circular arc limit, bottom of snap close connecting lever leave the top of locking connecting lever, and the locking connecting lever is unlocked.
Can be respectively equipped with two snap close connecting levers hinged with contact knife in the lower bearing pin both sides, a spacer pin is passed at the top of locking connecting lever, and spacer pin cooperates with the circular arc margin position of two snap close connecting lever bottoms.
When rated current requires also can to adopt the two ends clamped-in style when big, promptly increase by a cover locking mechanism again at touch base one end, make between contact knife and touch base and also substitute single spring compression type by identical locking mode, guarantee contact force.
When adopting the two ends clamped-in style, the lower end of described locking connecting lever is provided with the wedge head, in the cover steel ball is housed in the bottom of left and right sides contact knife; Two magnetic padlock plates are positioned at the stiff end of left and right sides contact knife by the bearing pin that passes left and right sides contact knife; Described steel ball one side is attached on the wedge head of the lower end of locking connecting lever, and opposite side is attached to magnetic padlock plate inboard.
A described side magnetic padlock plate and upper pin end are with stage clip.When the magnetic padlock plate adopted rigid material to make, the elastic force by stage clip can make magnetic padlock plate and contact compress reliably.
Operation principle of the present invention: when switch when closing operation is carried out in the separating brake position, because of locking connecting lever upper end or the spacer pin of its upper end and the effect of snap close connecting lever, the locking connecting lever and the contact knife of band wedge head can not relatively rotate, and under the insulated tension pole effect, contact knife rotates to the fixed contact direction.After contact knife enters the fixed contact certain depth, the snap close connecting lever is promoted by fixed contact, and overcome torsion spring on the snap close snap close connecting lever and the clockwise direction rotation, after contact knife puts in place, the spacer pin of locking connecting lever upper end or its upper end is left on the circular arc limit, bottom of snap close connecting lever fully, the locking connecting lever of band wedge head is under the pull bar effect, begin to clockwise rotate, drive two steel balls in contact knife, overlap in to outer motion, promote the magnetic padlock plate and outwards move, add the effect of compression spring, force the magnetic padlock plate other end inwardly to promote contact knife and fixed contact clamping, when the alignment pin in the elongated slot contacts with the other end of elongated slot, clamp release, switch closes a floodgate and finishes.The separating brake process is an inverse process.
Switch of the present invention is in the closing operation process, and when contact knife entered fixed contact, the two did not have contact pressure, after contact knife puts in place, by the clamping action of magnetic padlock plate, guarantees the contact pressure of contact knife and fixed contact, so whole process operation power is very little.After introducing the locking connecting lever of a band wedge head on the contact knife, realize the clamped-in style action at 40.5kv and above electric pressure, pull bar acts on the run-on point of the point of locking connecting lever near contact knife and touch base, makes the actuating length (displacement) of insulated tension pole be unlikely to excessive.By the position-limiting action of snap close connecting lever, guarantee contact knife rotation-contact knife locking action accurately and reliably, overcome the insecure shortcoming of GN22 switch motion of 12kv.
Description of drawings
Fig. 1 is the front view of first kind of execution mode fasten type high-voltage isolation switch of the present invention.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the structural representation of first kind of locking connecting lever in the execution mode.
Fig. 4 is the left view of second kind of execution mode fasten type high-voltage isolation switch of the present invention.
Fig. 5 is the structural representation of the locking connecting lever of band spacer pin in second kind of execution mode.
Fig. 6 is a switch shown in Figure 4 internal structure schematic diagram when closing a floodgate.
Internal structure schematic diagram when Fig. 7 is a switch separating brake shown in Figure 4.
Fig. 8 is the left view of the third execution mode two ends fasten type high-voltage isolation switch.
Fig. 9 is the structural representation of the locking connecting lever of two ends band wedge in the third execution mode.
Internal structure schematic diagram when Figure 10 closes a floodgate not locking state for the third execution mode switch.
Embodiment
As shown in Figure 1, a kind of fasten type high-voltage isolation switch, every insulator 2, insulated tension pole 3 of comprising mutually, fixed contact 4, left and right sides contact knife 5 and retaining mechanism, contact knife 5 one ends are stiff end, are hinged on the touch base 7, the other end is the mobile terminal, contacts with fixed contact 4 to be communicated with or away from disconnecting two service positions; One transmission arm 8 be fixed on the hinged main shaft 9 of underframe 1 on, an end and the transmission arm 8 of insulated tension pole 3 are hinged, the other end and be located at the lower hinge of the locking connecting lever 10 between the left and right sides contact knife 5.
Shown in Fig. 2,3, retaining mechanism comprises two magnetic padlock plates 11, two steel balls 16 and locking connecting lever 10, upper pin 12 and lower bearing pin 13 mobile terminal that be connected left and right sides contact knife 5 of magnetic padlock plate 11 by passing left and right sides contact knife 5, two steel balls 16 be installed in left and right sides contact knife 5 in the cover.Magnetic padlock plate 11 adopts spring steel plate to make, and also can make of general steel plate, and when adopting general steel plate, the end of upper pin 12 is with stage clip 14, guarantees that the contact pressure of contact knife and fixed contact is reliable and stable.
Locking connecting lever 10 is installed in the middle of the left and right sides contact knife 5, the middle part of locking connecting lever 10 is hinged by fixed pin shaft 15 and left and right sides contact knife 5, lower end and insulated tension pole 3 are hinged, and locking connecting lever bottom has an elongated slot 21, and an alignment pin 20 that is fixed in the elongated slot 21 on the contact knife passes; The top band one wedge head 23 of locking connecting lever 10, two steel balls 16 that are contained in 5 li covers of left and right sides contact knife are attached to this wedge head 23 both sides, two magnetic padlock plate 11 inboards about two steel balls, 16 opposite sides are attached to respectively; Contact knife 5 tops are provided with and are provided with the snap close connecting lever 18 hinged with contact knife 5 through lower bearing pin 13 centers, and torsion spring 19 1 ends are against on the upper pin 12, and the other end is pressed on the snap close connecting lever 18, makes snap close connecting lever 18 be subjected to the power of changeing counterclockwise.In the separating brake position, locking connecting lever 10 tops are lived by the bottom circular arc side bumper of snap close connecting lever 18, can not clockwise rotate and static relatively around fixed pin shaft 15; Snap close connecting lever 18 upper ends are subjected to the effect of fixed contact 4 when combined floodgate puts in place, overcome the torsion of torsion spring and clockwise rotate, and make the circular arc limit, bottom of snap close connecting lever 18 leave locking connecting lever top; Locking connecting lever 10 is unlocked.
Shown in Fig. 4,5, snap close connecting lever 18 can be provided with identical two respectively in lower bearing pin 13 both sides respectively; When snap close connecting lever 18 was provided with two, snap close connecting lever 18 was not in same plane with locking connecting lever 10, and a spacer pin 17 passes the top of snap close connecting lever 18 connecting levers and fixing, and spacer pin 17 two ends cooperate with the circular arc margin position of the bottom of two snap close connecting levers 18 respectively.
Shown in Fig. 6,7,8, when switch when closing operation is carried out in the separating brake position, because of the spacer pin 17 of locking connecting lever 10 upper ends and the effect of snap close connecting lever 18, the connecting lever 10 of band wedge head can not relatively rotate with contact knife 5, under insulated tension pole 3 effects, contact knife rotates to fixed contact 4 directions.After contact knife 5 enters the fixed contact certain depth, snap close connecting lever 18 is promoted by fixed contact 4, and overcome torsion spring 19 on the snap close connecting lever 18 and the clockwise direction rotation, after contact knife puts in place, the spacer pin 17 of locking connecting lever 10 upper ends is left on the circular arc limit, bottom of snap close connecting lever 18 fully, the locking connecting lever 10 of band wedge head is under the pull bar effect, begin to clockwise rotate, drive two steel balls 16 in contact knife, overlap in to outer motion, promote outwards motion of magnetic padlock plate 11, owing to be subjected to stage clip 14 effects, force magnetic padlock plate 11 other ends inwardly to promote contact knife 5 and fixed contact 4 clampings, when spacer pin 20 contacts with the other end of elongated slot 21, clamp release, switch closes a floodgate and finishes.
The separating brake process is an inverse process, insulated tension pole 3 promotes locking connecting lever 10 and rotates counterclockwise, steel ball 16 is along with inside motion, being added on the contact knife 5 clamping force therefore cancels, elongated slot 21 other ends up to locking connecting lever 10 lower ends contact with spacer pin 20, and promotion contact knife 5 clockwise rotates and separates with fixed contact 4.
Shown in Fig. 9,10, when rated current requires greatly, another embodiment of the invention is the two ends fasten type high-voltage isolation switch, a cover locking mechanism identical with contact knife 5 upper ends promptly is set in the lower end of contact knife 5 again, and two magnetic padlock plates 26 are positioned at the bottom of left and right sides contact knife 5 by the bearing pin 27 that passes left and right sides contact knife 5; Locking is provided with a wedge head 24 near connecting lever 10 bottoms and insulated tension pole 3 hinged places again, be contained in two interior steel balls 25 of 5 li covers of left and right sides contact knife and be attached to this wedge head 24 both sides respectively, steel ball 25 opposite sides be attached to respectively retaining mechanism about two magnetic padlock plate 26 inboards.The contact performance of present embodiment contact knife two and touch base or contact is good, and operating physical force is light, when huge short circuit current passes through, has increased contact pressure, has improved moving, the thermal stability of isolating switch.
Through actual measurement, be voltage 40.5KV equally, the isolating switch of rated current 1250A adopts the switch of clamped-in style on-off ratio GN19 type of the present invention, and operating physical force can reduce more than 3 times, and is basic identical with the operating physical force of GN27 type switch.Compare with GN22, simple in structure, contact knife rotation-contact knife locking action accurately and reliably.
Claims (4)
1. fasten type high-voltage isolation switch, every insulator (2), insulated tension pole (2) of comprising mutually, fixed contact (3), left and right sides contact knife (5) and retaining mechanism, the lower end of contact knife (5) are hinged on the touch base (7), and the upper end contacts with fixed contact (3) and is communicated with or away from disconnecting two service positions; Retaining mechanism comprises magnetic padlock plate (11), steel ball (16), locking connecting lever (10), upper pin (12) and lower bearing pin (13) upper end that be positioned at left and right sides contact knife (5) of two magnetic padlock plates (11) by passing left and right sides contact knife (5), it is characterized in that: described locking connecting lever (10) is installed in the middle of the left and right sides contact knife (5), the middle part of locking connecting lever (10) is hinged by alignment pin (15) and contact knife (5), the bottom and the insulated tension pole (2) of locking connecting lever (10) are hinged, locking connecting lever (10) bottom has an elongated slot (21), an alignment pin (20) that is fixed in the elongated slot (21) on the two side contact knifes (5) passes, the top band one wedge head (23) of locking connecting lever (10); Described steel ball (16) is installed in respectively in the cover of left and right sides contact knife (5) lining; Steel ball (16) one sides are attached on the wedge head (23), and opposite side is attached to magnetic padlock plate (11) inboard; Contact knife (5) top is provided with through lower bearing pin (13) and the hinged snap close connecting lever (18) of contact knife, and a torsion spring (19) one ends are against on the upper pin (12), and the other end is pressed on the snap close connecting lever (18), makes snap close connecting lever (18) be subjected to the power of changeing counterclockwise; The top of locking connecting lever (10) cooperates with the circular arc margin position of snap close connecting lever (18) bottom.
2. fasten type high-voltage isolation switch according to claim 1 is characterized in that: described contact knife (5) top lower bearing pin (12) both sides are provided with and the hinged snap close connecting lever (18) of contact knife (5) simultaneously; A spacer pin (17) is passed at locking connecting lever (18) top, and spacer pin (17) cooperates with the circular arc margin position of two snap close connecting lever (18) bottoms.
3. according to claim 1 or 2 or 3 described fasten type high-voltage isolation switch, it is characterized in that: the lower end of described contact knife (5) is provided with and the identical retaining mechanism in contact knife (5) upper end, described locking connecting lever (10) is provided with wedge head (24) with the bottom of insulated tension pole (3) hinged place, and the magnetic padlock plate (26) of described retaining mechanism is positioned at the both sides, lower end of left and right sides contact knife (5) by the bearing pin (27) that passes left and right sides contact knife (5); Described steel ball (25) is installed in the bottom of left and right sides contact knife (5) in the cover, and a side is attached on the wedge head (24), and opposite side is attached to magnetic padlock plate (26) inboard.
4. according to the described fasten type high-voltage isolation switch of the arbitrary right of claim 1-3, it is characterized in that: a described side magnetic padlock plate (11) is with stage clip (14) with upper pin (12) end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810062435A CN100583340C (en) | 2008-06-10 | 2008-06-10 | Fasten type high-voltage isolation switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810062435A CN100583340C (en) | 2008-06-10 | 2008-06-10 | Fasten type high-voltage isolation switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101290845A true CN101290845A (en) | 2008-10-22 |
| CN100583340C CN100583340C (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810062435A Active CN100583340C (en) | 2008-06-10 | 2008-06-10 | Fasten type high-voltage isolation switch |
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| CN (1) | CN100583340C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881507A (en) * | 2012-10-24 | 2013-01-16 | 苏州工业园区天东电器有限公司 | Contact connector of isolating switch |
| CN103165335A (en) * | 2013-03-27 | 2013-06-19 | 苏州长量电器有限公司 | High voltage load switch connected by hinged joints |
| CN105788940A (en) * | 2016-04-29 | 2016-07-20 | 句容华源电器设备有限公司 | Push-and-pull type isolation switch |
| CN110729148A (en) * | 2019-09-20 | 2020-01-24 | 李中毅 | Distribution network automation control device for power grid dispatching |
| CN112420437A (en) * | 2020-11-23 | 2021-02-26 | 西安西电开关电气有限公司 | Double-locking device with auxiliary support and large-capacity switch equipment |
| CN113972087A (en) * | 2020-07-24 | 2022-01-25 | 河南森源电气股份有限公司 | Touch knife assembly and isolating switch |
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| US4126773A (en) * | 1977-03-09 | 1978-11-21 | S&C Electric Company | Polyphase disconnecting switch arrangement |
| FR2691009B1 (en) * | 1992-05-11 | 1997-04-04 | Gec Alsthom Engergie Inc | SECTIONER WITH VERTICAL OPENING AND OSCILLATING COLUMN. |
| 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 |
| AU2000267048A1 (en) * | 2000-08-18 | 2002-02-25 | Industrias De Aparellaje Electrico, S.A. | Bases for cutout circuits and method for the production thereof |
| CN2629197Y (en) * | 2002-09-12 | 2004-07-28 | 朱鸣海 | 12KV outdoor AC isolating swtich and grounding swtich |
| JP4591871B2 (en) * | 2005-12-19 | 2010-12-01 | 株式会社高岳製作所 | High pressure switch |
| CN201004408Y (en) * | 2006-10-31 | 2008-01-09 | 河南森源电气股份有限公司 | An interlock machine for principle axis and grounding rotary axis of separation switch |
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2008
- 2008-06-10 CN CN200810062435A patent/CN100583340C/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881507A (en) * | 2012-10-24 | 2013-01-16 | 苏州工业园区天东电器有限公司 | Contact connector of isolating switch |
| CN103165335A (en) * | 2013-03-27 | 2013-06-19 | 苏州长量电器有限公司 | High voltage load switch connected by hinged joints |
| CN105788940A (en) * | 2016-04-29 | 2016-07-20 | 句容华源电器设备有限公司 | Push-and-pull type isolation switch |
| CN105788940B (en) * | 2016-04-29 | 2017-11-03 | 利辛县江淮扬天汽车有限公司 | A kind of plug-type disconnecting switch |
| CN110729148A (en) * | 2019-09-20 | 2020-01-24 | 李中毅 | Distribution network automation control device for power grid dispatching |
| CN113972087A (en) * | 2020-07-24 | 2022-01-25 | 河南森源电气股份有限公司 | Touch knife assembly and isolating switch |
| CN112420437A (en) * | 2020-11-23 | 2021-02-26 | 西安西电开关电气有限公司 | Double-locking device with auxiliary support and large-capacity switch equipment |
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| Publication number | Publication date |
|---|---|
| CN100583340C (en) | 2010-01-20 |
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