CN203883460U - Explosion type short-circuit current limiter - Google Patents
Explosion type short-circuit current limiter Download PDFInfo
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- CN203883460U CN203883460U CN201420158230.6U CN201420158230U CN203883460U CN 203883460 U CN203883460 U CN 203883460U CN 201420158230 U CN201420158230 U CN 201420158230U CN 203883460 U CN203883460 U CN 203883460U
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- current
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- short circuit
- blasting type
- voltage
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- 238000004880 explosion Methods 0.000 title abstract description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000011787 zinc oxide Substances 0.000 claims abstract description 19
- 238000004804 winding Methods 0.000 claims abstract description 12
- 239000002360 explosive Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000005422 blasting Methods 0.000 claims description 46
- 239000000843 powder Substances 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 6
- 238000009834 vaporization Methods 0.000 claims description 4
- 230000008016 vaporization Effects 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 230000009471 action Effects 0.000 description 8
- 238000011161 development Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides an explosion type short-circuit current limiter which comprises an explosion type high-speed isolator, a high-voltage current limiting fuse, a current limiting reactor, a high-energy zinc oxide arrester, a current transformer, a control unit and a high-speed detonating fuse. The high-voltage current limiting fuse, the current limiting reactor and the high-energy zinc oxide arrester are in parallel connection with the explosion type high-speed isolator separately and then serially connected into the position in a wire at which fast end opening is needed. The current transformer is serially connected into the wire. The primary winding of the current transformer is used to measure the wire loop current, and the secondary winding of the current transformer is used to generate a short-circuit current signal and connected to the control unit. The control unit is used to acquire the short-circuit current signal, and connected to the explosion type high-speed isolator through the high-speed detonating fuse. The explosive material in the explosion type high-speed isolator is detonated according to the short-circuit current signal. According to the utility model, the technical problem that the 110kV voltage level short-circuit current is limited can be solved, and important equipment, such as transformers, etc., can be effectively protected from being impacted by the short-circuit current.
Description
Technical field
The utility model relates to Power System Shortcuts current limit field, relates in particular to a kind of blasting type short circuit current limiter.
Background technology
Last decade, under the promotion of rapid economic development and system innovation, power industry has realized fast development.According to statistics, electric power installation total capacity rises to 11.45 hundred million kilowatts of the end of the year 2012 from 3.57 hundred million kilowatts of the end of the year 2002.Along with the high speed development of power construction and gradually becoming strong of electric power transmission network, make grid short circuit levels of current constantly soaring, the problem causing thus highlights gradually.On the one hand, the increase of grid short circuit electric current, causing electric equipment (as circuit breaker and isolating switch) in electrical network to cut-off capacity does not mate with the capacity of short circuit of system gradually, the rupturing capacity of circuit breaker and other equipment and short circuit dynamic stability can not meet system requirements, there is but will be replaced by the circuit breaker that cut-offs more greatly capacity, manufacture difficulty is large, and cost is very high, is not a kind of economically viable, blanket method.On the other hand, the opening time of general circuit breaker is 20～150ms, the standard-sized sheet break time at least needs a few tens of milliseconds, and the peak-peak of short circuit current often appears in first cycle, and aperiodic component is very large, this just caused within the circuit breaker standard-sized sheet break time, peak value of short causes repeatedly and impacts the visual plant such as generator, transformer, anti-short circuit capability to the equipment such as generator, transformer is had higher requirement, and in accounting system, the maximum of existing some transformers tolerance short circuit current design load can not meet the demands.Therefore, need a kind of device that moment discovery fast shut-off short circuit current can occur at short circuit current.
Short circuit current limiter (fault current limiter) is a kind of device of quick limiting short-circuit current, and operate time, its effect was by its quick-speed turning on-off before short circuit current does not reach peak-peak in 5ms.Just form product (the Is-quick current-limiting device of ABB AB) abroad as far back as the fifties, through the development of decades, main three classes that form at present: the first kind is exactly the mixing type current-limiting device that adopts explosion switch and current limiting fuse to compose in parallel, Equations of The Second Kind is the flow restricter that adopts the impedance of power power electronic device control circuit; The 3rd class is exactly to adopt to have the material (as superconductor) of special nature as the element of flow restricter.They have respectively unique current limiting characteristic.The fault current limiter from the development of past ten years with higher maturity and practicality is the mixing type current-limiting device that adopts explosion switch and current limiting fuse to compose in parallel, and has only obtained application comparatively widely in 10kV system at present.
110kV is a main electric pressure of domestic electrical network, and along with the sharply increase of electric load, 110kV short circuit current is also increasing, under short-circuit current rush and that the accident that deformation of transformer winding damages occurs is of common occurrence.Conventional current-limiting method is to adopt series connection current limiting reactor at present, although this technology can play certain limiting short-circuit current effect, but cannot fundamentally solve the harm of short circuit current, also can bring the unfavorable factors such as power loss (idle and meritorious), bus pressure drop, stray field simultaneously.Therefore, the research of 110kV system short-circuit current limit technology and apply significant.
Utility model content
The purpose of this utility model is the deficiency for existing short-circuit current limitation technology, the fracture of blasting type short circuit current limiter is opened to the key technologies such as distance, control system, triggering mode and is redesigned, and is applied to 110kV network system.
In order to achieve the above object, the utility model embodiment provides a kind of blasting type short circuit current limiter, comprising: blasting type high-speed isolated device, high-voltage and current-limitation fuse, current limiting reactor, high energy ZnO lightning arrester, current transformer, control unit and high speed powder squib; Wherein, after described high-voltage and current-limitation fuse, current limiting reactor, high energy ZnO lightning arrester are in parallel with described blasting type high-speed isolated device respectively, seal in the position that needs the quick beginning in wire, described current transformer is connected in described wire, its winding is for measure traverse line loop current, and its secondary winding generates short circuit current signal and is connected to described control unit; Described control unit gathers described short circuit current signal, and connects described blasting type high-speed isolated device by described high speed powder squib, ignites the explosive in described blasting type high-speed isolated device according to described short circuit current signal.
The blasting type short circuit current limiter of the utility model embodiment has solved the technical barrier of restriction 110kV electric pressure short circuit current, effectively protects the visual plants such as transformer to avoid the impact of short circuit current.And the blasting type short circuit current limiter of the utility model embodiment also has following beneficial effect: 1, be parallel to high-speed isolated device two ends by dry current limiting reactor, not only reduced fracture voltage but also limited short circuit current; 2, control system adopts logical circuit and microcomputer circuit dual system, has improved action accuracy; 3, adopt high speed powder squib to transmit trigger energy, the ingenious isolating problem that has solved high-pressure system and electronic control system; 4, adopt the double-fracture series connection form of high-speed isolated device, avoid the bang of fracture under high pressure to wear; 5, under normal operation, fuse and reactor etc. is zero impedance or low impedance state, and active power and reactive power loss are little; 6, control system is installed on electronegative potential, and anti-electromagnetic interference capability is strong.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those skilled in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the blasting type short circuit current limiter of the utility model embodiment;
Fig. 2 is the end view that high-voltage and current-limitation fuse, blasting type high-speed isolated device and high energy ZnO lightning arrester are positioned at an embodiment of the inside of described dry-type air-core reactor;
Fig. 3 is the vertical view that high-voltage and current-limitation fuse, blasting type high-speed isolated device and high energy ZnO lightning arrester are positioned at an embodiment of the inside of described dry-type air-core reactor;
Fig. 4 is the structural representation that utilizes a specific embodiment of blasting type short circuit current limiter of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the structural representation of the blasting type short circuit current limiter of the utility model embodiment.As shown in Figure 1, the blasting type short circuit current limiter of the present embodiment comprises: blasting type high-speed isolated device 1, high-voltage and current-limitation fuse 2, current limiting reactor 3, high energy ZnO lightning arrester 4, current transformer 5, control unit 6 and high speed powder squib 7; Wherein, after described high-voltage and current-limitation fuse 2, current limiting reactor 3, high energy ZnO lightning arrester 4 are in parallel with described blasting type high-speed isolated device 1 respectively, seal in the position that needs the quick beginning in wire, described current transformer 5 is connected in described wire, its winding is for measure traverse line loop current, and its secondary winding generates short circuit current signal and is connected to described control unit 6; Described control unit 6 gathers described short circuit current signal, and connects described blasting type high-speed isolated device 1 by described high speed powder squib 7, ignites the explosive in described blasting type high-speed isolated device 1 according to described short circuit current signal.
In the present embodiment, wire is the 110KV lead-in wire in 110KV network system.As shown in Figures 2 and 3, described current limiting reactor 3 can be dry-type air-core reactor, in order to save space, described high-voltage and current-limitation fuse 2, blasting type high-speed isolated device 1 and high energy ZnO lightning arrester 4 are positioned at the inside of described dry-type air-core reactor 3, seal in the position that needs quick-speed turning on-off in 110kV lead-in wire after parallel combination.
Be made up of the copper pipe that possesses high current carrying capacity the galvanic circle of blasting type high-speed isolated device 1, its resistance only has tens micro-ohms, have the advantages that ampacity is large, temperature rise is little, explode quick action, but its high-current on-off poor ability, therefore its effect is normal condition download stream, fast transfer short circuit current under short-circuit conditions.In order to ensure that in 110kV system applies, fracture bang can not occur wears, the utility model adopts double-fracture series connection form, and adopts two current-carrying pontic series connection.The explosive of crossing through Passivation Treatment is buried at each position of cut-offfing in advance underground, is the synchronism of safety action, adopts series high-speed powder squib 7 to ignite.
High-voltage and current-limitation fuse 2 has very strong current breaking capacity and good I/s characteristic, under short circuit current effect, its melt is understood rapid melting, vaporization, generation electric arc, is set up arc voltage, extinguish arcs, finally realize cut-offfing of electric current, but the rated current of high-voltage and current-limitation fuse 2 is less, and current capacity is limited, resistance is tens milliohms, therefore its effect is to stay out of under normal circumstances, under short-circuit conditions, cut-offs short circuit current.
Dry-type air-core reactor 3 is in parallel with blasting type high-speed isolated device 1, not only can reduce fracture both end voltage but also can limiting short-circuit current, for maintain current conductive state after current limiting fuse fusing, blow-out.
The cut-off overvoltage that high energy ZnO lightning arrester 4 may occur for limiting described high-voltage and current-limitation fuse 2 two ends, prevents that fracture from restriking and reactor turn-to-turn insulation is damaged.
In the present embodiment, described current transformer 5 is connected in described 110KV wire, and its winding is for measure traverse line loop current, and its secondary winding generates short circuit current signal and is connected to described control unit 6.
Control unit 6 is for collection, calculating, judgement, the blast signal output of short circuit current signal.High speed powder squib 7, for igniting the desensitized explosive of high-speed isolated device, also plays the effect of a high-pressure system of isolation (110KV wire) and control unit 6 simultaneously.
Wherein, described control unit 6 all gathers current amplitude and rate of change (di/dt), adopts logical circuit and microcomputer circuit dual system to analyze, judge simultaneously, and only all satisfy condition at two cover systems, trigger command just can send, and avoids malfunction.Therefore, control unit 6, owing to adopting logical circuit and microcomputer circuit dual system, has improved action accuracy.In one embodiment, control unit 6 is for collection, calculating, judgement, the blast signal output of short circuit current signal, comprise main control unit, signal processing unit, energy-storage units, igniting unit, display unit, its operation principle is: installation's power source charges to energy-storage units, the electric current that current transformer 5 is inputted is after the sequence of operations such as conversion, removal interference, signal screening, after signal processing unit processes, input main control unit, then passing through algorithm computing, generating action command; If described action command meets operation condition, send firing command by it to igniting unit.For avoiding the electromagnetic interference of high pressure primary system, the TT&C system of 110kV speed-sensitive switch should be arranged in low-pressure side, for improving functional reliability, adopts mathematical logic circuit and microcomputer dual command.Logical circuit adopts triode to realize, and microcomputer circuit adopts the quick computing module of DSP, and CPU adopts the pic chip of Wei Xin company of the U.S..Measuring current transformer can directly be applied existing apparatus in transformer station, and by the mode of high-speed digital signal processing, ensures the real-time that system is detected.Energy-storage units is produced by high pressure and relay charge-discharge control circuit and three groups of separate big capacity electrolyte capacitors form, and high pressure generation loop can produce 1000V left and right voltage.Igniting unit adopts electric capacity directly to produce the mode of electron ion spark, directly lights detonator.The information such as operating state, time on date with touch function liquid crystal display screen display device, while display state, power supply status on panel.
The workflow of the blasting type short circuit current limiter of the utility model embodiment is:
1, in the time of normal operation, blasting type high-speed isolated device 1 almost carries whole operating currents, and high-voltage and current-limitation fuse 2 and current limiting reactor 3 are bypassed, and there is no electric current.
2,, in the time being short-circuited fault in 110kV network system, short circuit current, after current transformer 5 transfers to control unit 6 identifications, sends control signal, lights high speed powder squib 7.High speed powder squib 7 is ignited the explosive of burying underground in blasting type high-speed isolated device 1, and current－carrying conductor cut-offs immediately, and its resistance rises rapidly, and short circuit current is transferred in high-voltage and current-limitation fuse 2, through fusing, vaporization, arc extinguishing, by current transfer to current limiting reactor 3.If high-voltage and current-limitation fuse 2 in advance closures, produce overvoltage, high energy ZnO lightning arrester 4 moves, and limits the voltage that dams.
Specific embodiment:
Describe as embodiment taking a capacity 180MVA in a 220kV transformer station, the 220kV transformer that connects group YNyn0d11.As shown in Figure 4, the outlet of transformer medium voltage side is through blasting type short circuit current limiter, circuit breaker, isolating switch to middle pressure bus, and high-speed isolated device, current limiting fuse, reactor, lightning arrester parallel connection access.In this embodiment, the reactance value of reactor is 5.5 Ω, can bear industrial frequency withstand voltage 35kV in short-term between two-terminal; 110kV explosion type high-speed isolated device adopts two current-carrying pontic series connection, and the clear distance cut-offfing after each pontic action is 110mm, and the clear distance after two series connection pontics cut-off will reach 220mm, can meet reactor both end voltage 35kV requirement; High-voltage and current-limitation fuse adopts high-performance fuse, and inner packing material is silver, length 700mm, and specified drop-out current reaches 4kA, and both end voltage can meet 35kV requirement; High energy ZnO lightning arrester adopts the zinc oxide resistance sheet with high square wave through-current capability, and 1mm electric potential gradient reaches 30V; Current transformer can directly use transformer station's existing equipment.Although common protective current transformer, is easily saturated at large first cycle effect lower core of electric current, causes secondary current to occur deviation.But the utility model control system completes detection in first cycle uphill process of short circuit current, ignites immediately high-speed isolated device, does not have transformer iron core saturation problem.
In this specific embodiment; when normal operation; the running current high-speed isolated device of almost all flowing through, in the time being short-circuited fault, high-speed isolated device disconnects fast; short circuit current is transferred to current limiting fuse; after fusing, vaporization, arc extinguishing, short circuit current is transferred to again reactor, because reactor impedance seals in; short circuit current is limited, thus protection transformer medium voltage side winding.
By the blasting type short circuit current limiter of the utility model embodiment, solve the technical barrier of restriction 110kV electric pressure short circuit current, effectively protect the visual plants such as transformer to avoid the impact of short circuit current.And the blasting type short circuit current limiter of the utility model embodiment also has following beneficial effect:
1, be parallel to high-speed isolated device two ends by dry current limiting reactor, not only reduced fracture voltage but also limited short circuit current;
2, control system adopts logical circuit and microcomputer circuit dual system, has improved action accuracy;
3, adopt high speed powder squib to transmit trigger energy, the ingenious isolating problem that has solved high-pressure system and electronic control system;
4, adopt the double-fracture series connection form of high-speed isolated device, avoid the bang of fracture under high pressure to wear;
5, under normal operation, fuse and reactor etc. is zero impedance or low impedance state, and active power and reactive power loss are little;
6, control system is installed on electronegative potential, and anti-electromagnetic interference capability is strong.
In the utility model, applied specific embodiment principle of the present utility model and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present utility model and core concept thereof; , for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model meanwhile.
Claims (9)
1. a blasting type short circuit current limiter, is characterized in that, comprising: blasting type high-speed isolated device, high-voltage and current-limitation fuse, current limiting reactor, high energy ZnO lightning arrester, current transformer, control unit and high speed powder squib;
Wherein, after described high-voltage and current-limitation fuse, current limiting reactor, high energy ZnO lightning arrester are in parallel with described blasting type high-speed isolated device respectively, seal in the position that needs the quick beginning in wire, described current transformer is connected in described wire, its winding is for measure traverse line loop current, and its secondary winding generates short circuit current signal and is connected to described control unit;
Described control unit gathers described short circuit current signal, and connects described blasting type high-speed isolated device by described high speed powder squib, ignites the explosive in described blasting type high-speed isolated device according to described short circuit current signal.
2. blasting type short circuit current limiter according to claim 1, is characterized in that, described blasting type high-speed isolated device adopts double-fracture series connection form, prevents that fracture bang from wearing.
3. blasting type short circuit current limiter according to claim 1, is characterized in that, described control unit comprises: main control unit, signal processing unit, igniting unit and display unit;
Described main control unit connects described signal processing unit, igniting unit and display unit;
Described signal processing unit is changed, is removed after interference, signal screening the short circuit current signal of described current transformer input, inputs described main control unit;
Described in described main control unit control, igniting unit sends firing command;
Described display unit is touch function LCDs, for operating state, time on date, signal condition and the power supply status of display unit.
4. blasting type short circuit current limiter according to claim 1, it is characterized in that, described current limiting reactor is dry-type air-core reactor, and described high-voltage and current-limitation fuse, blasting type high-speed isolated device and high energy ZnO lightning arrester are positioned at described dry-type air-core reactor inside.
5. blasting type short circuit current limiter according to claim 1, it is characterized in that, described high-voltage and current-limitation fuse is in parallel with described blasting type high-speed isolated device, under described short circuit current effect, its melt rapid melting, vaporization, generation electric arc, set up arc voltage, extinguish arcs, to realize cut-offfing of electric current.
6. blasting type short circuit current limiter according to claim 1, it is characterized in that, described high energy ZnO lightning arrester is in parallel with described high-voltage and current-limitation fuse, for limiting the cut-off overvoltage that described high-voltage and current-limitation fuse two ends may occur, prevent that fracture from restriking and reactor turn-to-turn insulation is damaged.
7. blasting type short circuit current limiter according to claim 1, is characterized in that, described current limiting reactor is in parallel with described blasting type high-speed isolated device, for reducing fracture both end voltage and limiting short-circuit current.
8. blasting type short circuit current limiter according to claim 1, is characterized in that, described high-voltage and current-limitation fuse adopts high-performance fuse, and inner packing material is silver.
9. blasting type short circuit current limiter according to claim 1, is characterized in that, described high energy ZnO lightning arrester adopts the zinc oxide resistance sheet with high square wave through-current capability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420158230.6U CN203883460U (en) | 2014-04-02 | 2014-04-02 | Explosion type short-circuit current limiter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420158230.6U CN203883460U (en) | 2014-04-02 | 2014-04-02 | Explosion type short-circuit current limiter |
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| Publication Number | Publication Date |
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| CN203883460U true CN203883460U (en) | 2014-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420158230.6U Expired - Lifetime CN203883460U (en) | 2014-04-02 | 2014-04-02 | Explosion type short-circuit current limiter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104979811A (en) * | 2014-04-02 | 2015-10-14 | 国家电网公司 | Explosion type short-circuit current limiter |
| CN106849030A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of high-voltage and current-limitation device based on current limliting zinc oxide FR |
-
2014
- 2014-04-02 CN CN201420158230.6U patent/CN203883460U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104979811A (en) * | 2014-04-02 | 2015-10-14 | 国家电网公司 | Explosion type short-circuit current limiter |
| CN106849030A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of high-voltage and current-limitation device based on current limliting zinc oxide FR |
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Granted publication date: 20141015 |