CN202268691U - Overvoltage absorbing device of mid-mounted switch cabinet - Google Patents
Overvoltage absorbing device of mid-mounted switch cabinet Download PDFInfo
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- CN202268691U CN202268691U CN2011203140250U CN201120314025U CN202268691U CN 202268691 U CN202268691 U CN 202268691U CN 2011203140250 U CN2011203140250 U CN 2011203140250U CN 201120314025 U CN201120314025 U CN 201120314025U CN 202268691 U CN202268691 U CN 202268691U
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- isolating switch
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Abstract
The utility model relates to an overvoltage absorbing device of a mid-mounted switch cabinet, and aims to solve a problem with the prior art that overvoltage is sure to generate when an object capacitor is slowly connected to a power supply. The main points of the technical scheme are that the overvoltage absorbing device of a mid-mounted switch cabinet comprises a multipolar isolation switch composed of a plurality of synchronous isolation switches, and three single-phase overvoltage absorbing devices corresponding to a three-phase power supply; each single-phase overvoltage device comprises a fuse, a lightning arrester and a capacitor; the first conduction terminal of the fuse is electrically connected with the input terminal of the lightning arrester; the output terminal of the lightning arrester is connected with the ground; the second conduction terminal of the fuse is electrically connected with the first conduction terminal of the capacitor; the first conduction terminal of each fuse is electrically connected with a corresponding power supply phase wire via a phase line isolation switch; and neutral points are electrically connected with neutral wires via neutral point isolation switches. According to the utility model, any of the capacitors is prevented from overvoltage.
Description
Technical field
The utility model relates to a kind of overvoltage absorption plant, particularly a kind of intermediate switchgear cabinet overvoltage absorption plant.
Background technology
In traditional 6 ~ 10KV electric power system, on bus, connect one group of scheme of electric power of forming by electric capacity and zinc oxide arrester, in order to the absorption system overvoltage.Because zinc oxide arrester is very effective to the amplitude of over-voltage, but can not reduce superpotential steepness, and electric capacity can change slow superpotential leading-edge steepness, so the two cooperating can effectively absorb the overvoltage from system.At present, the scheme of electric power that adopts electric capacity and zinc oxide arrester to form begins extensive use, but if the three-phase electricity synchronizing characteristics is not good in this scheme of electric power; Then possibly cause at first gap breakdown of the phase of one in the three-phase electricity, to the electric capacity charging, and moment before the capacitance current zero passage; It decays to zero again suddenly, therefore send in the electric operating process whole, and electric capacity arc reignition has taken place and cut zero; Thereby cause electromagnetic viscosimeter, and make the loop produce overvoltage, cause this phase fuse failure.
In certain engineering, the high pressure handcart-type promptly is employed in and connects one group of scheme of electric power of being made up of electric capacity and zinc oxide arrester on the bus, and supply voltage is 10KV, electric capacity 11/3 KV-3X30KVAR; Fuse is chosen as 8A, when being chosen as 10A, all fuses at the fuse of C phase by GB requirement (1.43 ~ 1.55 times of electric capacity rated current), and it is relatively poor to cause fusing takes place fuse main cause to be net synchronization capability; Handcart is in progradation, and contact procedure is A phase, C phase, B phase successively, because the speed that handcart advances is slowly advanced; At first after A is connected power supply, C phase main contact this moment access failure also, before will connecting in a flash; The C phase is gap breakdown at first, to the electric capacity charging, and moment before the capacitance current zero passage; It decays to zero again suddenly, therefore send in the electric operating process whole, and electric capacity arc reignition has taken place and cut zero; Thereby cause electromagnetic viscosimeter, and make the loop produce overvoltage, cause C phase fuse failure.Can draw the scheme of electric power that electric capacity and zinc oxide arrester form by above-mentioned analysis and also have following problem: 1. electric capacity certainly will will produce overvoltage when slow energized; 2. there is residual high pressure static on the electric capacity, must carries out safe discharge, otherwise cause the electric shock casualty accident easily it; 3. in service as if certain phase fuse failure, the operations staff can't obtain this information immediately.
Chinese patent publication number CN2818240Y; Open day on September 20th, 2006; Disclose a kind of combined type and broken away from overvoltage protection device certainly big can the appearance; Comprise four zinc oxide valve plate FR, wherein the end of first, second and third zinc oxide valve plate FR1, FR2, FR3 connects respectively by A, B, the C three phase terminals of protection equipment, and the other end of first, second and third zinc oxide valve plate FR1, FR2, FR3 is connected with discharging gap assembly CG respectively; The other end of discharging gap assembly CG is connected with the 4th zinc oxide valve plate FR4; Described first, second and third zinc oxide valve plate FR1, FR2, FR3 are parallelly connected with rc absorber respectively, and first, second and third zinc oxide valve plate FR1, FR2, FR3 and the rc absorber after the parallel connection is serially connected in respectively between discharging gap assembly CG and the release unit BK, and release unit BK connects by A, B, the C three phase terminals of protection equipment.This technical scheme can be eliminated resonance overvoltage, but still has 1. electric capacity when slow energized, certainly will will produce overvoltage; 2. there is residual high pressure static on the electric capacity, must carries out safe discharge, otherwise cause the electric shock casualty accident easily it; 3. in service as if certain phase fuse failure, the operations staff can't obtain this information immediately.
Summary of the invention
The purpose of the utility model is to solve prior art electric capacity when slow energized, certainly will will produce superpotential problem, provides a kind of good synchronization performance is arranged, prevents that electric capacity from producing superpotential intermediate switchgear cabinet overvoltage absorption plant.
The utility model solves the technical scheme that its technical problem adopted: a kind of intermediate switchgear cabinet overvoltage absorption plant; Three groups of single-phase absorption overvolatge devices that comprise three phase lines of corresponding three-phase electricity; Said three groups of single-phase absorption overvolatge devices connect with parallel form; Described every group of single-phase overvolatge device includes fuse, lightning arrester and electric capacity; First conduction terminal of said fuse is electrically connected with the input of said lightning arrester; The output head grounding of said lightning arrester, second conduction terminal of said fuse is electrically connected with first conduction terminal of said electric capacity, and second conduction terminal of three said electric capacity all is electrically connected on neutral point; The special-purpose overvoltage absorption plant of described intermediate switchgear cabinet also comprises by several phase line isolating switches and the multipole isolating switch that the neutral point isolating switch constitutes; Described each phase line isolating switch is all synchronous with described neutral point isolating switch, and first conducting of each said fuse all is electrically connected with corresponding power supply phase line through the phase line isolating switch, and described neutral point is electrically connected with the neutral line through the neutral point isolating switch.Be provided with like this; Because the switching characteristic of multipole isolating switch is better, switching speed will be got well much than high pressure handcart; So at work, phase line isolating switch and neutral point isolating switches all when closing multipole isolating switch can both be closed simultaneously, can prevent that any one electric capacity from producing overvoltage.
As preferably; Described phase line isolating switch and described neutral point isolating switch include moving contact, first fixed contact and second fixed contact; The moving contact of said phase line isolating switch is electrically connected with first conduction terminal of said fuse; First fixed contact of said phase line isolating switch is electrically connected with the power supply phase line, the second fixed contact ground connection of said phase line isolating switch, and the moving contact of said neutral point isolating switch is electrically connected with neutral point; First fixed contact of said neutral point isolating switch is electrically connected with the neutral line, the second fixed contact ground connection of said neutral point isolating switch.Through such setting, can guarantee that first fixed contact can conducting during multipole isolating switch, every group of single-phase absorption overvolatge device is electrically connected with three-phase bus, absorbs overvoltage work; When breaking off multipole isolating switch, the second fixed contact conducting, the electric capacity of every group of single-phase absorption overvolatge device and neutral ground discharge, remaining high-pressure electrostatic safety discharge on the electric capacity can not cause the electric shock casualty accident in maintenance.
As preferably; The special-purpose overvoltage absorption plant of described intermediate switchgear cabinet also includes fusing indicator light, electrification in high voltage transducer and relay; First conduction terminal of said electrification in high voltage transducer is electrically connected with neutral point; The second conduction terminal ground connection of said electrification in high voltage transducer, the output of said electrification in high voltage transducer is electrically connected with the coil of said relay, and the normally opened contact of said relay is connected with described fusing indicator light and is formed the loop.At neutral point an electrification in high voltage transducer has been installed, electrification in high voltage transducer output directly links to each other with voltage relay, when normally moving; Neutral point only has very little unbalance voltage; When certain phase fuse failure, displacement voltage appears in neutral point, and relay gets electronic work; The normally opened contact of relay is closed, and the fusing indicator light is lighted and sent alarm signal.
As preferably, the special-purpose overvoltage absorption plant of described intermediate switchgear cabinet also includes discharge protector, and the output of said electrification in high voltage transducer is electrically connected with the input of said discharge protector, the output head grounding of described discharge protector.At electrification in high voltage transducer output over the ground and connect one and puncture insurance, scurry into, protected the safety of equipment to prevent high pressure.
As preferably; Described every group of single-phase absorption overvolatge device included the preposition electric capacity of indicator light and a charged indicator light; First conduction terminal of the preposition electric capacity of said indicator light is electrically connected with first conduction terminal of said fuse; Second conduction terminal of the preposition electric capacity of said indicator light is electrically connected with first conduction terminal of said charged indicator light electricity, the second conduction terminal ground connection of said charged indicator light electricity.Because the residual high-pressure electrostatic of meeting when the electric capacity of every group of single-phase absorption overvolatge device breaks off; Need discharge, the capacitor discharge electric current of every group of single-phase absorption overvolatge device is through the charged indicator light of the preposition electric capacity conducting of indicator light, so finish up to the capacitor discharge of every group of single-phase absorption overvolatge device; Charged indicator light is lighted always; Remind the user to note, can monitor discharge preferably and whether accomplish, and the setting of the preposition electric capacity of indicator light; Can guarantee that then the voltage that is loaded on charged indicator light can not suddenly change, play the charged indicator light of protection.
The beneficial effect of the utility model is: the utility model can prevent to produce overvoltage through synchronizing characteristics preferably; Can when breaking off multipole isolating switch, discharge simultaneously to electric capacity and neutral point; And at the electric charge of when discharge monitoring electric capacity; If fusible link fusing in service then can give the alarm, remind the operational management personnel to note.
Description of drawings
Fig. 1 is a kind of circuit theory diagrams of the utility model main circuit;
Fig. 2 is a kind of circuit theory diagrams of fusing warning circuit in the utility model.
Among the figure: 10, phase line isolating switch, 11, the neutral point isolating switch, 2, single-phase absorption overvolatge device, 3, the electrification in high voltage transducer; 4, discharge protector, 5, relay YJ coil, 51, relay YJ normally opened contact; 6, fusing indicator light, 21, the preposition electric capacity of indicator light, 22, charged indicator light; 23, fuse, 24, electric capacity, 25, lightning arrester.
Embodiment
Below through specific embodiment, and combine accompanying drawing, the technical scheme of the utility model is further specified.
Embodiment: a kind of intermediate switchgear cabinet overvoltage absorption plant (referring to accompanying drawing 1); Comprise a multipole isolating switch; Multipole isolating switch is made up of three phase line isolating switches 10 and neutral point isolating switch 11; Three phase line isolating switches 10 and a neutral point isolating switch 11 are synchronous, and what the multipole isolating switch in the present embodiment was selected for use is four extremely two isolating switches through walls, and present embodiment also comprises three groups of single-phase absorption overvolatge devices 2 of corresponding three-phase electricity respectively; Three groups of single-phase absorption overvolatge device 2 parallel connections, every group of single-phase absorption overvolatge device 2 all is electrically connected with corresponding power supply phase line through a phase line isolating switch 11.Every group of single-phase absorption overvolatge device 2 includes the preposition electric capacity of indicator light 21, charged indicator light 22, fuse 23, electric capacity 24 and lightning arrester 25; Lightning arrester 25 is a zinc oxide arrester; Wherein, First conduction terminal of the preposition electric capacity 21 of indicator light and the input of lightning arrester 25 all are electrically connected with first conduction terminal of fuse 23, and second conduction terminal of the preposition electric capacity 21 of indicator light is electrically connected with first conduction terminal of charged indicator light 22, the second conduction terminal ground connection of charged indicator light 22; The output head grounding of lightning arrester 25; Second conduction terminal of fuse 23 is electrically connected with first conduction terminal of electric capacity 24, and second conduction terminal of electric capacity 24 is electrically connected with neutral point.Neutral point is electrically connected with the neutral line through neutral point isolating switch 11.Neutral point also is electrically connected with first conduction terminal of electrification in high voltage transducer 3; The second conduction terminal ground connection of electrification in high voltage transducer 3; The output of electrification in high voltage transducer 3 is electrically connected with relay YJ coil 5; Power supply VCC and relay YJ normally opened contact 51 and fusing indicator light 6 connect (referring to accompanying drawing 2) constitute the warning circuit that fuses, the output of electrification in high voltage transducer 3 also is electrically connected with the input of discharge protector 4, the output head grounding of discharge protector 4.Each phase line isolating switch 10 has included a moving contact, first fixed contact and one second fixed contact with neutral point isolating switch 11; The moving contact of phase line isolating switch 10 is electrically connected with first conduction terminal of fuse 23; First fixed contact of phase line isolating switch 10 is electrically connected with the power supply phase line; The second fixed contact ground connection of phase line isolating switch 10; The moving contact of neutral point isolating switch 11 is electrically connected with neutral point, and first fixed contact of neutral point isolating switch 11 is electrically connected with the power supply neutral line, the second fixed contact ground connection of neutral point isolating switch 11.
When present embodiment used, four extremely two isolating switch synchronizing closes through walls were because the synchronizing characteristics of four extremely two isolating switches through walls is better, so can prevent to produce overvoltage at closure moment electric capacity 24.In running, present embodiment can be in order to the absorption system overvoltage, and wherein zinc oxide arrester is very effective to the amplitude of over-voltage, and electric capacity can change slow superpotential leading-edge steepness, so the two cooperating can effectively absorb the overvoltage from system; During normal the operation, the neutral point of present embodiment only has very little unbalance voltage, so relay YJ is failure to actuate; When certain phase fuse failure, displacement voltage appears in neutral point, makes relay YJ coil 5 get electronic work; Relay YJ normally opened contact 51 closures, fusing indicator light 6 is lighted and is sent alarm signal.When needs overhaul, break off four extremely two isolating switches through walls, remnants have high-pressure electrostatic on the electric capacity 24; Four extremely two isolating switch ground connection through walls; Electric capacity 24 is through the discharge of second fixed contact, and in discharge process, electric capacity 24 discharging currents of every group of single-phase absorption overvolatge device are through the charged indicator light 22 of preposition electric capacity 21 conductings of indicator light; So electric capacity 24 discharges up to every group of single-phase absorption overvolatge device 2 finish; Whether charged indicator light 22 is lighted always, reminds the user to note, can monitor discharge preferably and accomplish.
Above-described embodiment is a kind of preferable scheme of the utility model, is not the utility model is done any pro forma restriction, under the prerequisite that does not exceed the technical scheme that claim puts down in writing, also has other variant and remodeling.
Claims (5)
1. intermediate switchgear cabinet overvoltage absorption plant; Three groups of single-phase absorption overvolatge devices that comprise three phase lines of corresponding three-phase electricity; Said three groups of single-phase absorption overvolatge devices connect with parallel form; Described every group of single-phase overvolatge device includes fuse, lightning arrester and electric capacity; First conduction terminal of said fuse is electrically connected with the input of said lightning arrester; The output head grounding of said lightning arrester, second conduction terminal of said fuse is electrically connected with first conduction terminal of said electric capacity, and second conduction terminal of three said electric capacity all is electrically connected on neutral point; It is characterized in that: the special-purpose overvoltage absorption plant of described intermediate switchgear cabinet also comprises by several phase line isolating switches and the multipole isolating switch that the neutral point isolating switch constitutes; Described each phase line isolating switch is all synchronous with described neutral point isolating switch, and first conducting of each said fuse all is electrically connected with corresponding power supply phase line through the phase line isolating switch, and described neutral point is electrically connected with the neutral line through the neutral point isolating switch.
2. intermediate switchgear cabinet overvoltage absorption plant according to claim 1; It is characterized in that: described phase line isolating switch and described neutral point isolating switch include moving contact, first fixed contact and second fixed contact; The moving contact of said phase line isolating switch is electrically connected with first conduction terminal of said fuse; First fixed contact of said phase line isolating switch is electrically connected with the power supply phase line, the second fixed contact ground connection of said phase line isolating switch, and the moving contact of said neutral point isolating switch is electrically connected with neutral point; First fixed contact of said neutral point isolating switch is electrically connected with the neutral line, the second fixed contact ground connection of said neutral point isolating switch.
3. intermediate switchgear cabinet overvoltage absorption plant according to claim 1 and 2; It is characterized in that: the special-purpose overvoltage absorption plant of described intermediate switchgear cabinet also includes fusing indicator light, electrification in high voltage transducer and relay; First conduction terminal of said electrification in high voltage transducer is electrically connected with neutral point; The second conduction terminal ground connection of said electrification in high voltage transducer; The output of said electrification in high voltage transducer is electrically connected with the coil of said relay, and the normally opened contact of said relay is connected with described fusing indicator light and formed the loop.
4. intermediate switchgear cabinet overvoltage absorption plant according to claim 3; It is characterized in that: the special-purpose overvoltage absorption plant of described intermediate switchgear cabinet also includes discharge protector; The output of said electrification in high voltage transducer is electrically connected with the input of said discharge protector, the output head grounding of described discharge protector.
5. intermediate switchgear cabinet overvoltage absorption plant according to claim 1 and 2; It is characterized in that: described every group of single-phase absorption overvolatge device included the preposition electric capacity of indicator light and a charged indicator light; First conduction terminal of the preposition electric capacity of said indicator light is electrically connected with first conduction terminal of said fuse; Second conduction terminal of the preposition electric capacity of said indicator light is electrically connected with first conduction terminal of said charged indicator light electricity, the second conduction terminal ground connection of said charged indicator light electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203140250U CN202268691U (en) | 2011-08-26 | 2011-08-26 | Overvoltage absorbing device of mid-mounted switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203140250U CN202268691U (en) | 2011-08-26 | 2011-08-26 | Overvoltage absorbing device of mid-mounted switch cabinet |
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| Publication Number | Publication Date |
|---|---|
| CN202268691U true CN202268691U (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203140250U Expired - Fee Related CN202268691U (en) | 2011-08-26 | 2011-08-26 | Overvoltage absorbing device of mid-mounted switch cabinet |
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| CN (1) | CN202268691U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326248A (en) * | 2013-05-29 | 2013-09-25 | 安徽永川电器设备有限公司 | Switch cabinet with alternating current contactor protection device arranged inside |
-
2011
- 2011-08-26 CN CN2011203140250U patent/CN202268691U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326248A (en) * | 2013-05-29 | 2013-09-25 | 安徽永川电器设备有限公司 | Switch cabinet with alternating current contactor protection device arranged inside |
| CN103326248B (en) * | 2013-05-29 | 2015-12-23 | 安徽永川电器设备有限公司 | A kind of switch cubicle of built-in A.C. contactor protective device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120606 Termination date: 20180826 |