CN203180504U - Switch cabinet protecting device - Google Patents
Switch cabinet protecting device Download PDFInfo
- Publication number
- CN203180504U CN203180504U CN 201320192011 CN201320192011U CN203180504U CN 203180504 U CN203180504 U CN 203180504U CN 201320192011 CN201320192011 CN 201320192011 CN 201320192011 U CN201320192011 U CN 201320192011U CN 203180504 U CN203180504 U CN 203180504U
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- Prior art keywords
- switch
- arc
- switch cubicle
- comparator
- arc light
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- 230000001681 protective effect Effects 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 14
- 239000000523 sample Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 238000009413 insulation Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model discloses a switch cabinet protecting device. The switch cabinet protecting device includes an arc sensor arranged in the switch cabinet and used for detecting arc light intensity in a switch cabinet; a collector connected with a protection access ground wire; a current comparator connected with the collector; a voltage comparator connected with the collector; a microprocessor connected with the arc intensity sensor and the current comparator; a first switch controller connected with a wire outlet switch of the switch cabinet and the microprocessor; and a second switch controller connected with a wire inlet switch and a bus-coupling switch of the switch cabinet and connected with the microprocessor. The switch cabinet protecting device switches off the wire outlet switch of the switch cabinet according to an arc light detecting result and a current judging result and starts bus failure logic. Then if a bus still has zero-sequence voltage, the wire inlet switch and the bus-coupling switch are switched off for realizing an aim of eliminating bus failure.
Description
Technical field
The application relates to the protecting electrical power system technical field, causes the switch cubicle protective device that insulate and descend and then cause developing into phase-to phase fault when particularly relating to a kind of solution owing to the bus single-phase earthing.
Background technology
In electric power system, for the not directly grounded system of neutral point, when this system generation bus single phase ground fault, still can move 1-2 hour, protection does not require tripping operation.In the bus single phase ground fault, the phase voltage that can cause system's single-phase earthing to perfect phase becomes line voltage, this moment is for the bad system of insulation property, its single phase ground fault will develop into phase-to phase fault, so in case the internal fault of switch cubicle develops into phase-to phase fault, for the security consideration of switch cubicle, must control trip, with the excision fault point.
By the research to prior art, the inventor finds: be usually located near the bus owing to occur the place of bus single phase ground fault in the switch cubicle, and after breaking down, the system insulation performance of bus is generally damaged, often behind the outlet switch trip, the bus single phase ground fault can fast development become phase-to phase fault, causes heavy losses.
The utility model content
In view of this, the embodiment of the present application provides a kind of switch cubicle protective device, develops into the problem of phase-to phase fault because insulation descends during with solution bus single-phase earthing.
To achieve these goals, the technical scheme that provides of the embodiment of the present application is as follows:
A kind of switch cubicle protective device, the switchgear for the protection of in the switch cubicle comprises:
Be arranged in the switch cubicle, for detection of the arc photosensor of the arc light intensity in the described switch cubicle;
Insert ground wire with protection and be connected, and for detection of the three-phase current on the described protection access ground wire and the collector of residual voltage;
Be connected with described collector, be used for the current comparator that maximum and protective current definite value with three-phase current compare;
Be connected with described collector, be used for the voltage comparator that residual voltage and predetermined voltage threshold are compared;
Be connected with current comparator with described arc light intensity comparator, be used for the microprocessor when the maximum that detects arc optical signal and three-phase current generation trip signal and failure protection signal during greater than the protective current definite value;
Go out with switch cubicle that wiretap is connected and be connected with described microprocessor, be used for according to described trip signal, cut off first on-off controller that described switch cubicle goes out wiretap;
Be connected with switch cubicle service entrance switch, bus connection switch and be connected with described microprocessor; be used for when receiving described failure protection signal and described residual voltage greater than predetermined voltage threshold, cutting off the second switch controller of described switch cubicle service entrance switch and bus connection switch.
Preferably, described arc photosensor comprises:
Arc light acquisition probe for detection of switch cubicle inner arc luminous intensity;
Be connected with described arc light acquisition probe, be used for described arc light intensity and preset value relatively, and when the arc light intensity comparator of described arc light intensity generation arc light detection signal during greater than preset value.
Preferably, this protective device further comprises:
Be connected with described voltage comparator, be used for the timer that picks up counting during greater than predetermined voltage threshold when described residual voltage;
Be connected with described timer, be used for judging whether the timing time of described timer surpasses the time comparator of setting-up time value;
When receiving described failure protection signal and described timing time above after the setting-up time value, described second switch controller cuts off described switch cubicle service entrance switch and bus connection switch.
Preferably, described first on-off controller is relay.
Preferably, described second switch controller is relay.
By above technical scheme as seen; this protective device that the embodiment of the present application provides; can at first cut off the wiretap that of switch cubicle according to arc light testing result and electric current judged result; and the malfunctioning logic of startup busbar fault; if detect bus this moment residual voltage is arranged still; then by cutting off service entrance switch and bus connection switch reaching the purpose of excision busbar fault, and then because descending, insulation develops into the problem of phase-to phase fault can avoid by the bus single-phase earthing time.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, the accompanying drawing that describes below only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of a kind of switch cubicle protective device that Fig. 1 provides for the embodiment of the present application;
The structural representation of the arc photosensor that Fig. 2 provides for the embodiment of the present application;
The structural representation of the another kind of switch cubicle protective device that Fig. 3 provides for the embodiment of the present application.
Embodiment
In order to make those skilled in the art person understand technical scheme among the application better, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
The structural representation of a kind of switch cubicle protective device that Fig. 1 provides for the embodiment of the present application.
As shown in Figure 1, this device comprises: arc photosensor 1, collector 2, current comparator 3, voltage comparator 4, microprocessor 5, first on-off controller 6 and second switch controller 7.
Arc photosensor 1 is arranged in the switch cubicle, and for the not directly grounded system of neutral point, when the bus single phase ground fault took place, the voltage to earth that perfects phase became line voltage, and overvoltage condition can cause the system insulation performance to descend for a long time.When outlet switch cubicle internal fault developed into phase-to phase fault, the outlet cabinet can produce strong arc light.In the embodiment of the present application, arc photosensor 1 is for detection of the arclight signal in the described switch cubicle, and when arc fault occurring in the switch cubicle, arc photosensor 1 just sends the arc light detection signal.
In addition, for fear of the detection mistake that causes owing to other light, in the embodiment of the present application, as shown in Figure 2, arc photosensor 1 can also comprise: arc light acquisition probe 11 and arc light intensity comparator 12, wherein:
The effect of arc light acquisition probe 11 is luminous intensities of the arc light of appearance in the sense switch cabinet;
Arc light intensity level and default light intensity value that arc light intensity comparator 12 is used for detection is obtained compare, and have only the arc light intensity level that obtains when detection when presetting luminous intensity, and arc light intensity comparator 12 just generates the arc light detection signal.
In the embodiment of the present application, default light intensity value can freely be set in sensitivity according to actual needs, for the more situation of stray light, can increase presetting light intensity value, and then just can reduce the misoperation situation that occurs owing to stray light.
Be shown with formula table: max (Ia, Ib, Ic)〉Iset,
Wherein, Ia, Ib, Ic are respectively the effective value of three-phase current, and max is for asking for maximum, and Iset is the protective current definite value.
When needs cut off out wiretap, microprocessor 5 generated trip signal; And when needs started the malfunctioning logic of bus protection, microprocessor 5 generated the failure protection signal.
First on-off controller 6 goes out wiretap with switch cubicle and is connected, and first on-off controller 6 also is connected with microprocessor 5, and after first on-off controller 6 received trip signal, first on-off controller 6 cut off switch cubicles and goes out wiretap.In the embodiment of the present application, first on-off controller 6 can be relay.
After starting the malfunctioning logic of bus, also need to judge whether fault of bus by the bus residual voltage.So; second switch controller 7 is connected with microprocessor 5; and go out wiretap with switch cubicle and be connected with bus connection switch; the effect of second switch controller 7 is when receiving described failure protection signal and described residual voltage greater than predetermined voltage threshold; cut off described switch cubicle service entrance switch and bus connection switch, the excision busbar fault.
In other embodiment of the application, after the bus residual voltage is greater than predetermined voltage threshold, can also judge whether to continue to reach the time definite value of setting, after the time definite value that reaches setting, the second switch controller moves again.So as shown in Figure 3, this protective device can also comprise: timer 8 and time comparator 9, wherein:
Described timer 8 is connected with described voltage comparator 4, is used for carrying out timing during greater than predetermined voltage threshold when residual voltage;
Described time comparator 9 is connected with timer 8, second switch controller 7 respectively, is used for after timing time reaches the setting-up time definite value, generates triggering signal and sends to second switch controller 7, makes second switch controller 7 trigger in the back that satisfies condition.
Be near the bus owing to work as the arc fault point, the system insulation of the phase-to phase fault explanation bus of outlet cabinet also damages, and needs to start the malfunctioning logic of busbar fault.If this moment, bus still had residual voltage, illustrate that the single phase ground fault of bus still exists, and the system insulation performance of bus damages generally, can not develop rapidly and become the bus phase-to phase fault if do not excise fault.So after the malfunctioning logic of busbar fault starts, if bus still has residual voltage, need excise busbar fault at once, avoid that single phase ground fault develops into phase-to phase fault under the insulation damages.
And this protective device that the embodiment of the present application provides; can at first cut off the wiretap that of switch cubicle according to arc light testing result and electric current judged result; and the malfunctioning logic of startup busbar fault; if detect bus this moment residual voltage is arranged still; then by cutting off service entrance switch and bus connection switch reaching the purpose of excision busbar fault, and then because descending, insulation develops into the problem of phase-to phase fault can avoid by the bus single-phase earthing time.
The above only is the application's preferred implementation, makes those skilled in the art can understand or realize the application.Multiple modification to these embodiment will be apparent to one skilled in the art, and defined General Principle can realize under the situation of the spirit or scope that do not break away from the application in other embodiments herein.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. switch cubicle protective device, the switchgear for the protection of in the switch cubicle is characterized in that, comprising:
Be arranged in the switch cubicle, for detection of the arc photosensor of the arc light intensity in the described switch cubicle;
Insert ground wire with protection and be connected, and for detection of the three-phase current on the described protection access ground wire and the collector of residual voltage;
Be connected with described collector, be used for the current comparator that maximum and protective current definite value with three-phase current compare;
Be connected with described collector, be used for the voltage comparator that residual voltage and predetermined voltage threshold are compared;
Be connected with current comparator with described arc light intensity comparator, be used for the microprocessor when the maximum that detects arc optical signal and three-phase current generation trip signal and failure protection signal during greater than the protective current definite value;
Go out with switch cubicle that wiretap is connected and be connected with described microprocessor, be used for according to described trip signal, cut off first on-off controller that described switch cubicle goes out wiretap;
Be connected with switch cubicle service entrance switch, bus connection switch and be connected with described microprocessor; be used for when receiving described failure protection signal and described residual voltage greater than predetermined voltage threshold, cutting off the second switch controller of described switch cubicle service entrance switch and bus connection switch.
2. device according to claim 1 is characterized in that, described arc photosensor comprises:
Arc light acquisition probe for detection of switch cubicle inner arc luminous intensity;
Be connected with described arc light acquisition probe, be used for described arc light intensity and preset value relatively, and when the arc light intensity comparator of described arc light intensity generation arc light detection signal during greater than preset value.
3. device according to claim 2 is characterized in that, this protective device further comprises:
Be connected with described voltage comparator, be used for the timer that picks up counting during greater than predetermined voltage threshold when described residual voltage;
Be connected with described timer, be used for judging whether the timing time of described timer surpasses the time comparator of setting-up time value;
When receiving described failure protection signal and described timing time above after the setting-up time value, described second switch controller cuts off described switch cubicle service entrance switch and bus connection switch.
4. device according to claim 3 is characterized in that, described first on-off controller is relay.
5. device according to claim 3 is characterized in that, described second switch controller is relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320192011 CN203180504U (en) | 2013-04-16 | 2013-04-16 | Switch cabinet protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320192011 CN203180504U (en) | 2013-04-16 | 2013-04-16 | Switch cabinet protecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203180504U true CN203180504U (en) | 2013-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320192011 Expired - Fee Related CN203180504U (en) | 2013-04-16 | 2013-04-16 | Switch cabinet protecting device |
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| Country | Link |
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| CN (1) | CN203180504U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111913041A (en) * | 2020-09-02 | 2020-11-10 | 安徽一天电能质量技术有限公司 | Alternating current switch cabinet arc light detection system and method thereof |
| CN113410821A (en) * | 2021-05-19 | 2021-09-17 | 河南巨高嘉业电力设备有限公司 | Protection circuit of power distribution cabinet |
| CN114002540A (en) * | 2021-09-23 | 2022-02-01 | 南京国电南自电网自动化有限公司 | Power distribution network line developmental fault protection method and system |
-
2013
- 2013-04-16 CN CN 201320192011 patent/CN203180504U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111913041A (en) * | 2020-09-02 | 2020-11-10 | 安徽一天电能质量技术有限公司 | Alternating current switch cabinet arc light detection system and method thereof |
| CN113410821A (en) * | 2021-05-19 | 2021-09-17 | 河南巨高嘉业电力设备有限公司 | Protection circuit of power distribution cabinet |
| CN113410821B (en) * | 2021-05-19 | 2023-10-20 | 河南巨高嘉业电力设备有限公司 | Protection circuit of switch board |
| CN114002540A (en) * | 2021-09-23 | 2022-02-01 | 南京国电南自电网自动化有限公司 | Power distribution network line developmental fault protection method and system |
| CN114002540B (en) * | 2021-09-23 | 2024-05-28 | 南京国电南自电网自动化有限公司 | Power distribution network line development fault protection method and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20200416 |
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| CF01 | Termination of patent right due to non-payment of annual fee |