CN101483106B - Interlocking apparatus for looped network switch system and looped network switch system - Google Patents
Interlocking apparatus for looped network switch system and looped network switch system Download PDFInfo
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- CN101483106B CN101483106B CN2008100558239A CN200810055823A CN101483106B CN 101483106 B CN101483106 B CN 101483106B CN 2008100558239 A CN2008100558239 A CN 2008100558239A CN 200810055823 A CN200810055823 A CN 200810055823A CN 101483106 B CN101483106 B CN 101483106B
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Abstract
The present invention relates to a looped network switching system and an interlock device of the looped network switching system. The device is connected with two or more looped network switching operation shafts, and includes: cams, fixed on the looped network switching operation shafts; a hydraulic device, including more than two hydraulic cylinders and connectivity devices, wherein, the hydraulic device is contained with at least a fluid whose effective piston cavity size is greater than zero; the hydraulic cylinders are provided corresponding to the cams, the looped network switching operation shafts rotates to a switch-on position, the outer margin at the cam effective long diameter point butts to the piston rod to allow the piston to locate at the top center; when the piston deviates from the top center, the piston rod butts to the outer margin at the cam effective long diameter to rotate the looped network switching operation shaft to a switch-off position. The looped network switching system adopts the inventive looped network switching system adopts the inventive looped network switching system interlock device, the cam is sheathed on the looped network switching operation shaft, the looped network switching operation shafts are in corresponding connection the switches. The present invention can improve reliability of the looped network interlock device, and has simple structure and low cost.
Description
Technical field
The present invention relates to the interlock and the loop networks switch system of a kind of loop networks switch system, relate in particular to a kind of loop networks switch system that realizes the device of two on the ring main unit above looped network interlock device operations and adopt this interlock.
Background technology
Ring main unit claims the ring network power supply unit again, is the equipment that is used to realize power distribution, control and electic protection, in order to satisfy the demand of different distribution network nodes.Ring main unit is provided in ring network power supply or power supply of radiation net and the unattended switching station usually.In the circuit connecting mode of two inlet wire ring main units, a kind of for not being with female mode, be provided with two loop networks switches, at synchronization, need to guarantee can only to have at most a loop networks switch to close a floodgate, another loop networks switch separating brake, or two separating brakes all; Another kind of connected mode is provided with three loop networks switches for being with female mode, at synchronization, needs to guarantee to have at most two loop networks switches to close a floodgate, and promptly has at least a loop networks switch to be in gate-dividing state.For guaranteeing the security reliability of ring main unit power supply, need branch, the "on" position of loop networks switch are controlled, promptly need to realize interlocking between loop networks switch.
Prior art adopts the mode of manual operation, electric operation or both combinations to realize the interlocked operation of loop networks switch system usually.Manually operated automatization level is low, and the possibility of people for misoperation may occur, mechanical interlocking need be set usually to prevent misoperation, and mechanical interlocking is than the reliability height of electrical interlock.
The electrical interlock mode, a kind of usual way wherein is the closed and disconnected that adopts relay interlock circuit control relay, it is not closed simultaneously normally to control each relay, to realize looped network interlock device, but the shortcoming that adopts the relay interlocking to exist is: do not having under the situation of power supply, the relay interlock circuit can't be worked, then can't guarantee interlock, having under the situation of power supply, also might cause the misoperation of relay, thereby make the interlocked operation failure of loop networks switch because of the fault of relay interlock circuit, cause accident generations such as short circuit, so the loop networks switch system adopts relay to realize the poor reliability of interlocking.
Summary of the invention
The interlock and the loop networks switch system that the purpose of this invention is to provide a kind of loop networks switch system, to realize that two above loop networks switches in the loop networks switch system are carried out interlocked operation, keep all loop networks switches not to be in "on" position simultaneously, and the reliability height of interlocked operation device.
For achieving the above object, the invention provides the interlock of a kind of loop networks switch system, link to each other with two above loop networks switch operating axis, the interlock of this loop networks switch system comprises:
Two with overhead cam, and each cam fixed cover is located on the loop networks switch operating axis;
Hydraulic means comprises two above hydraulic cylinders and the communication apparatus that is communicated with the effective plunger shaft of each hydraulic cylinder; Be equipped with the fluid of volume in this hydraulic means, be used to keep the volume of at least one effective plunger shaft greater than zero greater than the communication apparatus volume; Each hydraulic cylinder and a corresponding setting of cam, when the loop networks switch operating axis turns to closing position, the piston rod that the outer rim at the effective major diameter of cam place is replaced this hydraulic cylinder makes the piston of hydraulic cylinder be positioned at top dead centre, when the piston of hydraulic cylinder left top dead center position, the outer rim that the piston rod of hydraulic cylinder is replaced the effective minor axis of cam place made the loop networks switch operating axis turn to the separating brake position.
For achieving the above object, the present invention also provides a kind of loop networks switch system, adopt loop networks switch of the present invention system interlock, and also comprise: at least two loop networks switches, each loop networks switch links to each other with a loop networks switch operating axis, fixes the cam in the sheathed loop networks switch system interlock on each loop networks switch operating axis.
By above technical scheme as can be known, the present invention adopts hydraulic technique to realize the interlocking of loop networks switch, has overcome prior art and has made the interlocking action unreliable because of relying on electric energy, has the technical problem of potential safety hazard.The interlock of loop networks switch of the present invention system can effectively guarantee the interlocked operation of loop networks switch, keeps all loop networks switches not to be in "on" position simultaneously, the reliability height, and this device and loop networks switch system is simple in structure, and cost is low.
Also in conjunction with the accompanying drawings the present invention is described in further detail below by specific embodiment.
Description of drawings
Fig. 1 is the structural representation of the interlock specific embodiment one of loop networks switch of the present invention system;
Fig. 2 is the structural representation of the interlock specific embodiment two of loop networks switch of the present invention system;
Fig. 3 is the structural representation of the interlock specific embodiment three of loop networks switch of the present invention system;
Fig. 4 is the partial structurtes schematic diagram of the interlock specific embodiment four of loop networks switch of the present invention system;
Fig. 5 is the structural representation of loop networks switch of the present invention system specific embodiment.
Embodiment
The interlock embodiment one of loop networks switch system
Be illustrated in figure 1 as the structural representation of the interlock specific embodiment one of loop networks switch of the present invention system, present embodiment specifically is applied to the loop networks switch system with female mode, promptly be applicable to loop networks switch system, need to guarantee that by interlock two loop networks switches are in "on" position at the most with three loop networks switches.In the present embodiment, each loop networks switch is by each loop networks switch operating axis 5a, 5b and 5c realize residing turned position the combined floodgate and the sub-switching operation of loop networks switch, as shown in Figure 1, the residing position of loop networks switch operating axis 5b and 5c is a closing position, loop networks switch operating axis 5a promptly is in the separating brake position after rotating counterclockwise 90 degree with respect to closing position, each loop networks switch operating axis normally is passed to loop networks switch with the rotation of self by the miscellaneous part that connects on it, be converted to the closure of loop networks switch, opening operation, for example on the loop networks switch operating axis, can connect movable feeler lever, the end of movable feeler lever is as a contact of loop networks switch, another contact of loop networks switch is fixing, the rotation of operating axis drives movable feeler lever and rotates, and realizes the closed and disconnected between two contacts of loop networks switch.For realizing branch, the closing operation of loop networks switch, the angle that loop networks switch operating axis 5a, 5b and 5c need rotate is loop networks switch operating axis branch, closes a floodgate and rotate angle, can be acute angle, right angle or obtuse angle, can guarantee to realize that loop networks switch branch, combined floodgate get final product, the separating brake position of loop networks switch operating axis is not unique, turn an angle when leaving closing position at the loop networks switch operating axis, can realize separating brake, begin loop networks switch operating axis being rotated further within the specific limits thus and remain and be in the separating brake position.The interlock of present embodiment loop networks switch system and three loop networks switch operating axis 5a, 5b links to each other with 5c, the concrete structure of this device comprises: cam 4a, 4b and 4c, loop networks switch operating axis 5a, fix a sheathed cam 4a on 5b and the 5c respectively, 4b and 4c, each cam 4a, effective major diameter of 4b and 4c separately with loop networks switch operating axis 5a, the closing position correspondence of 5b and 5c, each cam 4a, effective minor axis of 4b and 4c separately with loop networks switch operating axis 5a, the separating brake position correspondence of 5b and 5c, can be that effective major diameter and closing position are located along the same line, effectively minor axis and sub-gate position are put and are located along the same line to satisfy corresponding relation, effective major diameter of its cam is exactly that cam is in the process of carrying out interlocked operation, the long radius that is used, the greatest radius L of cam 4b as shown in fig. 1 can think effective major diameter, similar with the definition of effective major diameter, effectively minor axis is that cam is in the process of carrying out interlocked operation, the short radius that is used, the short radius d of cam 4b as shown in fig. 1 can think effective minor axis, the radius length at other positions of cam is not because of in use being used to, so can limit.This interlock also comprises hydraulic means, comprise three hydraulic cylinder 1a, 1b and 1c, hydraulic cylinder 1a, 1b and 1c comprise cylinder body 11a respectively, 11b and 11c, piston 12a, 12b and 12c and piston rod 13a, 13b and 13c, piston 12a, 12b and 12c are at cylinder body 11a, reciprocating effective compression zone forms effective plunger shaft in 11b and the 11c, effective compression zone of so-called piston, be in the practical application, because of reciprocating motion of the pistons compresses, the space of expanding and changing, also be piston motion the scope of process, it is top dead centre that piston effectively compresses the top that is arrived, and is lower dead center bottom.Hydraulic means also comprises communication apparatus 2, effective plunger shaft of each hydraulic cylinder is interconnected by communication apparatus 2, be filled with fluid in the hydraulic means, can be liquid, preferably adopt hydraulic oil, the volume of filling liquid is greater than the volume of communication apparatus 2, and the volume that is used to keep at least one effective plunger shaft is just kept three pistons and is not positioned at top dead centre simultaneously greater than zero. Hydraulic cylinder 1a, 1b and 1c and cam 4a, 4b and the corresponding one by one setting of 4c, its corresponding relation is specially: when the loop networks switch operating axis turns to closing position, just drive cam rotation to the outer rim at the effective major diameter of cam place that is connected on it and replace piston rod, make piston be positioned at top dead centre, when the piston of certain hydraulic cylinder leaves top dead center position, promptly move downward a certain position, for example during lower dead center, the piston rod of hydraulic cylinder is replaced to the outer rim at the effective minor axis of cam place, makes the loop networks switch operating axis turn to the separating brake position.
Illustrate that in conjunction with Fig. 1 the interlock of present embodiment loop networks switch system realizes the principle of interlocking: loop networks switch operating axis 5b and 5c from the separating brake position when closing position rotates, can drive the cam 4b and the 4c that are connected on loop networks switch operating axis 5b and the 5c rotates, the outer rim of cam 4b and 4c will be replaced piston rod 13b and 13c moves upward, replace piston rod 13b and 13c makes piston 12b and 12c be positioned at top dead centre up to the outer rim at effective major diameter place of cam 4b and 4c, in hydraulic cylinder 1b that this moment is corresponding and the 1c effectively the volume of plunger shaft be zero.As shown in Figure 1, when two loop networks switch operating axis 5b and 5c turn to closing position simultaneously, effective plunger shaft volume in corresponding two hydraulic cylinder 1b and the 1c is zero, because the volume of the hydraulic oil of being filled is greater than the volume of communication apparatus 2, so hydraulic oil can flow in the communication apparatus 2 and remaining hydraulic cylinder 1a in, the pressure of hydraulic oil makes the interior effective plunger shaft volume of this hydraulic cylinder 1a greater than zero, then its piston 12a can leave top dead centre and moves downward to a certain position, driving piston rod 13a together moves downward, piston rod 13a replaces corresponding cam 4a and rotates counterclockwise, then drive corresponding loop networks switch operating axis 5a to the separating brake rotated position, at this moment, piston rod 13a replaces the outer rim at the effective minor axis of cam 4a place.The loop networks switch operating axis can have been realized separating brake usually when closing position rotates a less angle, be rotated further still to be in gate-dividing state, can be not in the arbitrary rotated position in the separating brake scope under the replacing of piston rod.Present embodiment can be realized the interlocking that three loop networks switches do not close a floodgate simultaneously, three plunger shaft can not be discharged hydraulic oil simultaneously, make its piston rod be positioned at top dead centre, promptly three loop networks switch operating axis can not be in closing position simultaneously, therefore can realize that three loop networks switches have two loop networks switches to be in "on" position at the most, another loop networks switch is in gate-dividing state, if the loop networks switch operating axis does not reach closing position fully, and be positioned at the centre position of closing position and separating brake position, also can not realize the closed communicating of switch, two of the switch less thaies that i.e. realization is closed a floodgate satisfy interlock requirement equally.
The technical scheme of present embodiment, with the interlock that hydraulic principle is realized, interlocking reliable in action height, the restriction that not supplied with by power supply, and this apparatus structure is simple, and cost is low.
In the present embodiment, the length of each piston rod can be inequality, can replace cam when piston rod when top dead center position stretches out and leave closing position and get final product, and cam can not finished under the replacing of piston rod being rotated further of separating brake scope.
In the present embodiment, the volume of filling hydraulic oil preferably equals the volume of communication apparatus and the maximum volume sum of an effective plunger shaft, the maximum volume of an effective plunger shaft promptly when piston is positioned at lower dead center, the interior maximum volume that is had of piston.When this technical scheme can make two pistons be replaced top dead centre, hydraulic oil promotes a remaining piston to lower dead center, and make the piston rod that stretches out replace cam rotation, making the loop networks switch operating axis be positioned at the separating brake position of a maximum and remain on this position can not be rotated further, can make the loop networks switch operating axis of separating brake can reliably arrive maximum separating brake position like this, and avoid close a floodgate and gate-dividing state between the position, can further improve the reliability of interlocked operation like this.Pass through length, piston diameter and stroke and the effective major diameter of cam and the shape between effective minor axis of appropriate design piston rod in this technical scheme, it is cooperatively interacted, when the loop networks switch operating axis is positioned at closing position, piston rod is replaced to being positioned at top dead centre by the effective major diameter outer rim of cam, when piston rod extend out to lower dead center, cam rotation can be replaced to replacing on effective minor axis outer rim, interlock can be realized.
For making the rotation unification of each cam, can make the effective major diameter of each cam and the difference of effective minor axis equate, even the progressive error between piston rod top dead centre and lower dead center equates, and the angle theta between the effective major diameter of each cam and the effective minor axis equates, and equals loop networks switch operating axis branch, combined floodgate rotation angle.Loop networks switch operating axis branch, close a floodgate to rotate angle and be generally 90 degree, then the shape of cam should be designed to effective major diameter and equals 90 with the effective angle between minor axis and spend.For guaranteeing the reliability of interlocked operation, piston rod need have sufficiently long stroke, and promptly the length difference of the stroke of piston rod, the effective major diameter of cam and effective minor axis should be greater than 12mm.On the basis of technique scheme, the shape that each cam can further be set is identical, and each hydraulic cylinder shape is identical, and the volume of its plunger shaft, piston diameter and stroke equate, the unification of action and the manufacturing of the standard component of being more convenient for then can effectively guarantee to interlock.
Relative position in the interlock of the loop networks switch system of present embodiment between each hydraulic cylinder 1a, 1b and 1c changes with the position that loop networks switch operating axis 5a, 5b and 5c are provided with; usually loop networks switch operating axis 5a, 5b and 5c are parallel to each other; then hydraulic cylinder 1a, 1b and 1c, and between interior piston rod 13a, 13b and the 13c also correspondence be arranged in parallel.The shape of communication apparatus 2 is decided with the position of hydraulic cylinder 1a, 1b and 1c, be communicated with each plunger shaft as long as can play, when the position of hydraulic cylinder 1a, 1b and 1c parallel, in the time of in one plane, then communication apparatus 2 is preferable can be a cylindrical tube, and its material can be copper, because the hardness height of copper pipe, be difficult for stressed expansion, and corrosion-resistant, durability is strong.
The interlock embodiment two of loop networks switch system
Be illustrated in figure 2 as the structural representation of the interlock specific embodiment two of loop networks switch of the present invention system, the structure of present embodiment and embodiment one is roughly the same, difference be loop networks switch operating axis 5a, 5b and 5c branch, close a floodgate to rotate angle be one 60 degree acute angles, then the shape corresponding setting of cam 4a, 4b and 4c for its effective major diameter and effectively the minimum angle between minor axis be 60 degree.
The operation principle of present embodiment is identical with embodiment one, in actual applications, only need to guarantee the effective major diameter of cam and effectively the minimum angle between minor axis equate with loop networks switch operating axis branch, the rotation angle that closes a floodgate, can realize the interlocking of loop networks switch, loop networks switch operating axis branch, the rotation angle that closes a floodgate can be acute angle, also can be the obtuse angle.
The interlock embodiment three of loop networks switch system
Be illustrated in figure 3 as the structural representation of the interlock specific embodiment three of loop networks switch of the present invention system, the structure of present embodiment and embodiment one is roughly the same, difference is that present embodiment is not for being with female mode, have two loop networks switches, interlocked operation need guarantee that a loop networks switch is in "on" position at the most, then present embodiment has reduced switching manipulation axle 5c than embodiment one, cam 4c, and the dependency structure of hydraulic cylinder 1c, and switching manipulation axle 5a and 5b, cam 4a and 4b, and the structure of hydraulic cylinder 1a and 1b is constant, communication apparatus 2 is communicated with the plunger shaft of hydraulic cylinder 1a and 1b simultaneously, and volume of filling liquid can equal the maximum volume sum of a communication apparatus 2 and a plunger shaft still greater than the volume of communication apparatus 2 in it.
The operation principle of present embodiment and embodiment one are roughly the same, can effectively realize the interlocked operation of loop networks switch, the reliability height, and simple in structure, cost is low.
The interlock embodiment four of loop networks switch system
Be illustrated in figure 4 as the partial structurtes schematic diagram of the interlock specific embodiment four of loop networks switch of the present invention system, present embodiment is on the basis of the foregoing description, baffle plate, jacking block or roller further are set, with piston rod 13a is example, at piston rod 13a front end baffle plate 14a is set, then piston rod 13a replaces on the outer rim of cam 4a by baffle plate 14a, and it is more reliable to make piston rod 13a replace the rotary manipulation of cam 4a.
The loop networks switch system embodiment
Loop networks switch of the present invention system specific embodiment is the loop networks switch system with female mode, has three loop networks switches.As shown in Figure 5, this loop networks switch system adopts the present invention to be applicable to that the embodiment of female mode loop networks switch system interlock realizes interlocked operation, this loop networks switch system specifically comprises: three loop networks switches, each loop networks switch is specially and comprises a fixed contact 100 and a moving contact 200, the contact of fixed contact 100 and moving contact 200 with separate the break-make and the closure that can realize loop networks switch, wherein, moving contact 200 is arranged on an end of movable feeler lever 201; Each loop networks switch links to each other with a loop networks switch operating axis, is specially the movable feeler lever 201 that connects each loop networks switch moving contact 200 and is fixedly connected on the loop networks switch operating axis, rotates along with the rotation of loop networks switch operating axis; Fix the cam in the sheathed loop networks switch system interlock on each loop networks switch operating axis.
When rotating two loop networks switch operating axis to closing position, the corresponding rotation of movable feeler lever makes moving contact contact Closing Switch with fixed contact.This moment is under the effect of loop networks switch system interlock, a remaining loop networks switch operating axis must turn to and leave closing position, then movable feeler lever is being driven corresponding the rotation, and moving contact can not be contacted with fixed contact, thereby reaches the purpose that this loop networks switch disconnects.
Not with female mode, have mode that interlock is set in the loop networks switch system of two loop networks switches and be with female mode loop networks switch system similar, difference is to reduce a loop networks switch and corresponding cam and hydraulic cylinder.
The loop networks switch system of present embodiment has the high interlock of reliability, and interlock is simple in structure, low cost of manufacture.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. the interlock of a loop networks switch system links to each other with two above loop networks switch operating axis, it is characterized in that comprising:
Two with overhead cam, and each described cam fixed cover is located on the described loop networks switch operating axis;
Hydraulic means comprises two above hydraulic cylinders and the communication apparatus that is communicated with the effective plunger shaft of each described hydraulic cylinder; Be equipped with the fluid of volume in the described hydraulic means, be used to keep the volume of at least one described effective plunger shaft greater than zero greater than described communication apparatus volume; An each described hydraulic cylinder and a corresponding setting of described cam, when described loop networks switch operating axis turns to closing position, the piston rod that the outer rim at the effective major diameter of described cam place is replaced described hydraulic cylinder makes the piston of described hydraulic cylinder be positioned at top dead centre, when the piston of described hydraulic cylinder left top dead center position, the outer rim that the piston rod of described hydraulic cylinder is replaced the effective minor axis of described cam place made described loop networks switch operating axis turn to the separating brake position.
2. the interlock of loop networks switch according to claim 1 system is characterized in that: effective major diameter of each described cam equates with the effective difference of minor axis length.
3. the interlock of loop networks switch according to claim 2 system, it is characterized in that: the shape of each described cam is identical.
4. according to the interlock of claim 1 or 2 or 3 described loop networks switch systems, it is characterized in that: the length difference of effective major diameter of described cam and effective minor axis is greater than 12mm.
5. according to the interlock of claim 1 or 2 or 3 described loop networks switch systems, it is characterized in that: effective major diameter of described cam and effectively the angle between minor axis equal 90 degree.
6. according to the interlock of claim 1 or 2 or 3 described loop networks switch systems, it is characterized in that: described piston rod is replaced on the outer rim of described cam by baffle plate, jacking block or roller.
7. according to the interlock of claim 1 or 2 or 3 described loop networks switch systems, it is characterized in that: described loop networks switch operating axis is parallel to each other, and the axis of described piston rod is parallel to each other.
8. loop networks switch system that adopts the described arbitrary loop networks switch of claim 1～7 system interlock, it is characterized in that also comprising: at least two loop networks switches, each described loop networks switch links to each other with a loop networks switch operating axis, fixes the cam in the sheathed described loop networks switch system interlock on each described loop networks switch operating axis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100558239A CN101483106B (en) | 2008-01-09 | 2008-01-09 | Interlocking apparatus for looped network switch system and looped network switch system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100558239A CN101483106B (en) | 2008-01-09 | 2008-01-09 | Interlocking apparatus for looped network switch system and looped network switch system |
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| CN101483106A CN101483106A (en) | 2009-07-15 |
| CN101483106B true CN101483106B (en) | 2010-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100558239A Active CN101483106B (en) | 2008-01-09 | 2008-01-09 | Interlocking apparatus for looped network switch system and looped network switch system |
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| CN108022791A (en) * | 2017-12-18 | 2018-05-11 | 云南电网有限责任公司电力科学研究院 | A kind of high-voltage switch gear three-phase mechanical blocking device and normal signal source |
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| FR2586868A1 (en) * | 1985-08-29 | 1987-03-06 | Merlin Gerin | Bypass interruptible connection cabinet |
| US6066821A (en) * | 1998-05-07 | 2000-05-23 | Eaton Corporation | Electrical switching apparatus with push buttons for a modular operating mechanism accessible through a cover plate |
| CN2836279Y (en) * | 2005-07-14 | 2006-11-08 | 杭州电器开关有限公司 | 12KV indoor AC high-voltage sulfur hexafluoride ring network switchgear |
| CN201149823Y (en) * | 2008-01-09 | 2008-11-12 | 广州霍斯通电气有限公司 | Interlocking device for looped network on-off system and looped network on-off system |
-
2008
- 2008-01-09 CN CN2008100558239A patent/CN101483106B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2586868A1 (en) * | 1985-08-29 | 1987-03-06 | Merlin Gerin | Bypass interruptible connection cabinet |
| US6066821A (en) * | 1998-05-07 | 2000-05-23 | Eaton Corporation | Electrical switching apparatus with push buttons for a modular operating mechanism accessible through a cover plate |
| CN2836279Y (en) * | 2005-07-14 | 2006-11-08 | 杭州电器开关有限公司 | 12KV indoor AC high-voltage sulfur hexafluoride ring network switchgear |
| CN201149823Y (en) * | 2008-01-09 | 2008-11-12 | 广州霍斯通电气有限公司 | Interlocking device for looped network on-off system and looped network on-off system |
Non-Patent Citations (1)
| Title |
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| JP特开平8-50836A 1996.02.20 |
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Address after: Baoju street 510730 Guangdong economic and Technological Development Zone No. 8 layer 2-5 Patentee after: Guangzhou Fokstone Electric Co., Ltd. Address before: Yuehai Group No. 555 building, 510050 Dongfeng Road Guangdong city of Guangzhou province 1604-1605 Patentee before: Guangzhou Fokstone Electric Co., Ltd. |
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Address after: 510730 Guangdong Province Bao Ju Guangzhou economic and Technological Development Zone No. 8 2-5 Street Patentee after: Guangzhou Fokstone Electric Co., Ltd. Address before: Baoju street 510730 Guangdong economic and Technological Development Zone No. 8 layer 2-5 Patentee before: Guangzhou Fokstone Electric Co., Ltd. |