CN101752846B - Arc short-circuit protection device and control method - Google Patents
Arc short-circuit protection device and control method Download PDFInfo
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- CN101752846B CN101752846B CN2008102180200A CN200810218020A CN101752846B CN 101752846 B CN101752846 B CN 101752846B CN 2008102180200 A CN2008102180200 A CN 2008102180200A CN 200810218020 A CN200810218020 A CN 200810218020A CN 101752846 B CN101752846 B CN 101752846B
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Abstract
The invention is applicable to the power system relay protection field and provides an arc short-circuit protection device and control method. The method comprises the following steps: controlling an arc probe to detect a light by utilizing the spectral characteristic, generating an arc signal if the spectral range of the light is in the detection spectral range; controlling an arc detection unit to converting the arc signal to an arc pulse signal; receiving the arc pulse signal transmitted by the arc detection unit, processing, outputting a driving signal to a protection exit circuit and disconnecting all the incoming lines of a bus bar. The arc short-circuit protection device of the embodiment of the invention utilizes the spectral characteristic to detect the light and has the advantage that the protection can not be operated incorrectly under the action of interference light.
Description
Technical field
The invention belongs to field of relay protection in power, relate in particular to a kind of arc short-circuit protection device and control method thereof.
Background technology
The power circuit arc short-circuit is a fault the most serious in the electrical network, especially occurs in the arc short-circuit fault at mesolow switch cubicle bus position, because a variety of causes often can not be got rid of fast, thereby lead to catastrophic consequence.At present; incoming relay-protection on the centering low-tension switch cabinet bus all adopts the current mode protective relaying device; in order when breaking down, to excise fault selectively; incoming relay-protection must cooperate with the electric current operating value of outlet protection and the time-delay of action; in order to guarantee selectivity; incoming relay-protection has generally all been cancelled current quick and has been adopted the electric current backup protection of being with time-delay; this is because adopt current quick; its operating current setting value is often very big; the reason that has resistance owing to arc light; its fault current does not often reach setting value and makes the protection miss operation, and after the backup protection of employing electric current, its operating current setting value is smaller; when bus breaks down; though protection can reflect correctly that the time expand of protection tripping operation is generally 1～3 second, so arc light can not excise fast.After bus broke down, because incoming power can not disconnect fast, arc light can not extinguish, and is easy to lead to developing fault, causes switch cubicle seriously to burn or even " baked wheaten cake is operated " accident, and its harm is very serious.And arc light also is very large to the harm of human body, the about 9000LUX of the light intensity of arc light, and the about 300LUX of the largest light intensity that human eye is experienced, this stabs people's eyes with regard to being easy to, near the personnel that work switch cubicle also are subjected to the burn of arc light easily, and personnel death's accident takes place in serious meeting.
In China, still there is not arc short-circuit protection device manufacturer, mainly rely on import, cost an arm and a leg.In recent years, along with the high speed development of domestic power industry, the number of applications of mesolow switch cubicle is more and more, on the one hand because switch cubicle arc short-circuit fault is increasing; The user is also more and more higher to the reliability requirement of power supply on the other hand, and is therefore very urgent to the demand of arc short-circuit protection device.
The import arc short-circuit protection device of present domestic use, its operation principle are to detect the size of light intensity and inlet wire current simultaneously, when detecting light intensity and current value and all cross the threshold value of setting, and the execute protection action.These protective devices not only cost an arm and a leg, and also there are the following problems:
Because the threshold value of light intensity and current value all is to set by rule of thumb; be not to calculate by science; therefore this protective device is easy under the interference of strong illumination; execute protection action mistakenly; such as, protective device thinks that mistakenly the arc short-circuit fault takes place at the bus position under the interference of lightning, searchlight, tungsten lamp irradiation; and the execute protection action is cut off the electricity supply.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of arc short-circuit protection method, is intended to solve there is malfunction in existing arc short-circuit protection device under the effect of stray light problem.
The embodiment of the invention is achieved in that a kind of arc short-circuit protection device, and described protective device comprises:
Arc probe is used to utilize spectral characteristic that light is detected, if the spectral region of light then generates arc optical signal in detecting spectral region;
The arc light detecting unit is used for converting described arc optical signal to the arc light pulse signal;
Controller is used to control the work of described arc probe and arc light detecting unit, receives the arc light pulse signal that described arc light detecting unit sends, after handling, and output drive signal; And
Protection outlet circuit is connected with the lead-in circuit breaker of switch cubicle bus, is used to receive the drive signal that described controller sends, and disconnects all incoming powers of bus.
Another purpose of the embodiment of the invention is to provide a kind of control method of arc short-circuit protection device, and described method comprises the steps:
The control arc probe utilizes spectral characteristic that light is detected, if the spectral region of light then generates arc optical signal in detecting spectral region;
Control arc light detecting unit converts described arc optical signal to the arc light pulse signal;
Receive the arc light pulse signal that described arc light detecting unit sends, after handling, output drive signal is given protection outlet circuit, disconnects all incoming powers of bus.
Embodiment of the invention arc short-circuit protection device detects light by utilizing spectral characteristic, has under the stray light effect advantage that protection can malfunction.
Description of drawings
Fig. 1 is the structure chart of the arc short-circuit protection device that provides of first embodiment of the invention;
Fig. 2 is the structure chart of the arc short-circuit protection device that provides of second embodiment of the invention;
Fig. 3 is the flow chart of the control method of the arc short-circuit protection device that provides of first embodiment of the invention;
Fig. 4 is the flow chart of the control method of the arc short-circuit protection device that provides of second embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the structure of the arc short-circuit protection device that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
The arc short-circuit protection device that the embodiment of the invention provides comprises arc probe 100, arc probe 100 is ultraviolet photosensitive pipe, it detects spectral region is 190-290nm, it utilizes spectral characteristic that light is detected, if the spectral region of light is in detecting spectral region, illustrate that light is arc light, generate arc optical signal; Arc short-circuit protection device also comprises the arc optical signal that receives arc probe 100 transmissions, converts thereof into the arc light detecting unit 200 of arc light pulse signal;
Arc short-circuit protection device also comprises controller 300, and the work of controller 300 control arc probe 100 and arc light detecting unit 200 receives the arc light pulse signal that arc light detecting unit 200 sends, after handling, and output drive signal;
Arc short-circuit protection device also comprises protection outlet circuit 400, and protection outlet circuit 400 is connected with the lead-in circuit breaker of switch cubicle bus, receives the drive signal that controller 300 sends, and disconnects all incoming powers of bus.
Arc short-circuit protection device also comprises the drive signal that receives controller 300 transmissions, the warning outlet circuit 500 of control warning circuit work, and as one embodiment of the invention, protection outlet circuit 400 constitutes by relay with the outlet circuit 500 of reporting to the police.
The operation principle of the arc short-circuit protection device that the embodiment of the invention provides is: arc probe 100 is ultraviolet photosensitive pipe; it detects spectral region is 190-290nm; arc probe 100 can not detect the not visible light in detecting spectral region of spectral region; as searchlight; tungsten lamp etc.; therefore protective device can be under the effect of stray light; think that mistakenly the arc short-circuit fault takes place at the bus position; and the execute protection action; in case and the arc short-circuit fault takes place in the bus position; because the spectral region of arc light is in detecting spectral region; arc probe 100 can detect the appearance of arc light; generate arc optical signal; arc light detecting unit 200 converts arc optical signal to the arc light pulse signal; controller 300 is handled the arc light pulse signal, output drive signal, and protection outlet circuit 400 disconnects all incoming powers of bus; eliminate arc light, the outlet circuit 500 control warning circuits of reporting to the police are reported to the police.
Fig. 2 shows the structure of the arc short-circuit protection device that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
In the use of arc short-circuit protection device, might be subjected to the interference of electric welding field, protective device can think that mistakenly the arc short-circuit fault takes place at the bus position under the effect of electric welding light like this, and the execute protection action.In order further to improve the anti-interference of arc short-circuit protection device, arc short-circuit protection device also comprises alternating current converting unit 600 and modulus sampling unit 700 except the structure that comprises first embodiment and provide.
Alternating current converting unit 600 converts alternating current on the bus to weak electric signal, and modulus sampling unit 700 is converted to the digital current signal with weak electric signal.
Further; controller 300 control arc probe 100; arc light detecting unit 200; the work of alternating current converting unit 600 and modulus sampling unit 700; and the arc light pulse signal of reception arc light detecting unit 200 transmissions and the digital current signal of modulus sampling unit 700 transmissions; digital current signal and arc light pulse signal are handled simultaneously; be specially: 300 pairs of digital current signals of controller calculate; obtain current sample value mutation amount or current effective value sudden change amount; if the arc light pulse signal exists; and the sudden change amount is greater than setting threshold value; output drive signal is given the protection outlet circuit 400 and the outlet circuit 500 of reporting to the police; protection outlet circuit 400 disconnects all incoming powers of bus; eliminate arc light, the outlet circuit 500 control warning circuits of reporting to the police are reported to the police.
The operation principle of the arc short-circuit protection device that the embodiment of the invention provides is: occur when arc short-circuit protection device detects arc light; simultaneously; arc short-circuit protection device also detects the jump-value of current of arbitrary phase of the alternating current on the bus greater than setting threshold value; controller 300 output drive signals; protection outlet circuit 400 disconnects all incoming powers of bus; eliminate arc light, the outlet circuit 500 control warning circuits of reporting to the police are reported to the police.Like this, arc short-circuit protection device can as lightning, searchlight, tungsten lamp etc., and not be subjected under the interference of electric welding field under the effect of stray light, thinks that mistakenly the arc short-circuit fault takes place at the bus position, and the execute protection action.
Fig. 3 shows the realization flow of the control method of the arc short-circuit protection device that first embodiment of the invention provides, and details are as follows:
In step S301, the control arc probe utilizes spectral characteristic that light is detected, if the spectral region of light then generates arc optical signal in detecting spectral region;
In step S302, control arc light detecting unit converts arc optical signal to the arc light pulse signal;
In step S303, receive the arc light pulse signal that the arc light detecting unit sends, after handling, output drive signal is given protection outlet circuit, disconnects all incoming powers of bus;
In step S304, output drive signal is given the outlet circuit of reporting to the police, the work of control warning circuit.
Fig. 4 shows the realization flow of the control method of the arc short-circuit protection device that second embodiment of the invention provides, and details are as follows:
In step S401, the control arc probe utilizes spectral characteristic that light is detected, if the spectral region of light then generates arc optical signal in detecting spectral region;
In step S402, control arc light detecting unit converts arc optical signal to the arc light pulse signal;
In step S403, control alternating current converting unit converts alternating current on the bus to weak electric signal;
In step S404, control modulus sampling unit is converted to the digital current signal with weak electric signal;
In step S405, receive the arc light pulse signal of arc light detecting unit transmission and the digital current signal that the modulus sampling unit sends, after handling, output drive signal is given protection outlet circuit, all incoming powers of disconnection bus;
This step is specially, and the digital current signal is calculated, and obtains current sample value mutation amount or current effective value sudden change amount, adopts formula specific as follows:
A) current effective value sudden change amount is calculated
Δ I=|I
k-I
K-1|, wherein, Δ I is the current effective value increment, I
kBe current calculating current effective value, I
K-1Be the preceding current effective value that once calculates;
B) current sample value mutation amount computational methods one
Δ i=|i
k-i
K-T|, wherein, Δ i is the current sampling data increment, i
kBe current current sample instantaneous value, i
K-TBe that all wavefront are with sequence number current sample instantaneous value;
C) current sample value mutation amount computational methods two
Δ i=|i
k-2i
K-T-i
K-T|, wherein, Δ i is the current sampling data increment, i
kBe current current sample instantaneous value, i
K-TBe that all wavefront are with sequence number current sample instantaneous value;
If the arc light pulse signal exists, and the said mutation amount is greater than setting threshold value, and output drive signal is given protection outlet circuit, disconnects all incoming powers of bus, otherwise, output drive signal not.
In step S406, output drive signal is given the outlet circuit of reporting to the police, the work of control warning circuit.
The embodiment of the invention detects light by utilizing spectral characteristic; solved there is malfunction in existing arc short-circuit protection device under the effect of stray light problem; and adopt the sudden change amount that detects bus current, further improved the anti-interference of arc short-circuit protection device.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be in being stored in a computer read/write memory medium, described storage medium is as ROM/RAM, disk, CD etc.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an arc short-circuit protection device is characterized in that, described protective device comprises:
Arc probe is used to utilize spectral characteristic that light is detected, if the spectral region of light then generates arc optical signal in detecting spectral region;
The arc light detecting unit is used for converting described arc optical signal to the arc light pulse signal;
Controller is used to control the work of described arc probe and arc light detecting unit, receives the arc light pulse signal that described arc light detecting unit sends, after handling, and output drive signal; And
Protection outlet circuit is connected with the lead-in circuit breaker of switch cubicle bus, is used to receive the drive signal that described controller sends, and disconnects all incoming powers of bus.
2. protective device as claimed in claim 1 is characterized in that, described protective device also comprises:
The alternating current converting unit is used for converting alternating current on the bus to weak electric signal; And
The modulus sampling unit is used for described weak electric signal is converted to the digital current signal.
3. protective device as claimed in claim 1 is characterized in that, described arc probe is ultraviolet photosensitive pipe.
4. protective device as claimed in claim 1 is characterized in that, described protective device also comprises:
Reporting to the police exports circuit, is used to receive the drive signal that described controller sends, the work of control warning circuit.
5. protective device as claimed in claim 4 is characterized in that, the described protection outlet circuit and the outlet circuit of reporting to the police constitute by relay.
6. the control method of an arc short-circuit protection device is characterized in that, described method comprises the steps:
The control arc probe utilizes spectral characteristic that light is detected, if the spectral region of light then generates arc optical signal in detecting spectral region;
Control arc light detecting unit converts described arc optical signal to the arc light pulse signal;
Receive the arc light pulse signal that described arc light detecting unit sends, after handling, output drive signal is given protection outlet circuit, disconnects all incoming powers of bus.
7. method as claimed in claim 6 is characterized in that described method also comprises the steps:
Control alternating current converting unit converts alternating current on the bus to weak electric signal;
Control modulus sampling unit is converted to the digital current signal with described weak electric signal;
The arc light pulse signal that described reception arc light detecting unit sends, after handling, output drive signal is given protection outlet circuit, and the step that disconnects all incoming powers of bus is specially:
Receive the arc light pulse signal of described arc light detecting unit transmission and the digital current signal that the modulus sampling unit sends, after handling, output drive signal is given protection outlet circuit, all incoming powers of disconnection bus.
8. method as claimed in claim 7; it is characterized in that the digital current signal that arc light pulse signal that described reception arc light detecting unit sends and modulus sampling unit send is after handling; output drive signal is given protection outlet circuit, and the step that disconnects all incoming powers of bus is specially:
Described digital current signal is calculated, obtain current sample value mutation amount or current effective value sudden change amount;
If described arc light pulse signal exists, and described current sample value mutation amount or current effective value sudden change amount be greater than setting threshold value, and output drive signal is given protection outlet circuit, disconnects all incoming powers of bus, otherwise, output drive signal not.
9. method as claimed in claim 6 is characterized in that, the arc light pulse signal that described reception arc light detecting unit sends, and after handling, output drive signal is given protection outlet circuit, also comprises after the step of all incoming powers of disconnection bus:
Output drive signal is given the outlet circuit of reporting to the police, the work of control warning circuit.
10. method as claimed in claim 7; it is characterized in that; the digital current signal that arc light pulse signal that described reception arc light detecting unit sends and modulus sampling unit send; after handling; output drive signal is given protection outlet circuit, and the step that disconnects all incoming powers of bus also comprises afterwards:
Output drive signal is given the outlet circuit of reporting to the police, the work of control warning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102180200A CN101752846B (en) | 2008-12-03 | 2008-12-03 | Arc short-circuit protection device and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102180200A CN101752846B (en) | 2008-12-03 | 2008-12-03 | Arc short-circuit protection device and control method |
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| Publication Number | Publication Date |
|---|---|
| CN101752846A CN101752846A (en) | 2010-06-23 |
| CN101752846B true CN101752846B (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008102180200A Expired - Fee Related CN101752846B (en) | 2008-12-03 | 2008-12-03 | Arc short-circuit protection device and control method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025131A (en) * | 2010-12-03 | 2011-04-20 | 铜川供电局 | Arc light monitoring and protecting system |
| CN103248016A (en) * | 2013-04-24 | 2013-08-14 | 南自晋能自动化有限公司 | Short-wave ultraviolet light bus protection device |
| CN103580005B (en) * | 2013-10-31 | 2017-03-08 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of arc light protection method |
| CN104439660B (en) * | 2014-11-19 | 2016-08-31 | 柳州市国辉汽车零部件有限公司 | Intelligence arc blocking electro-optical device |
| CN106093675A (en) * | 2016-06-06 | 2016-11-09 | 国家电网公司 | A kind of arc photosensor and arc light processing method |
| CN106786408B (en) * | 2016-12-25 | 2018-11-06 | 湖北知本信息科技有限公司 | A kind of electric arc light protection method |
| CN110854821B (en) * | 2019-11-15 | 2021-09-24 | 上海红檀智能科技有限公司 | Self-adaptive electric arc light protection method based on current and arc light change trend |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5221825A (en) * | 1992-06-01 | 1993-06-22 | The United States Of America As Represented By The Secretary Of Commerce | Sensing of gas metal arc welding process characteristics for welding process control |
| CN1635683A (en) * | 2003-12-26 | 2005-07-06 | 西安润辉科技发展有限公司 | Middle/low voltage bus short circuit protection method |
| CN200941542Y (en) * | 2006-07-25 | 2007-08-29 | 邢刚 | Protective breaker for fault electrical arc |
| CN101034801A (en) * | 2007-03-23 | 2007-09-12 | 上海市电力公司 | Online testing method of electrical arc light protection unit |
-
2008
- 2008-12-03 CN CN2008102180200A patent/CN101752846B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5221825A (en) * | 1992-06-01 | 1993-06-22 | The United States Of America As Represented By The Secretary Of Commerce | Sensing of gas metal arc welding process characteristics for welding process control |
| CN1635683A (en) * | 2003-12-26 | 2005-07-06 | 西安润辉科技发展有限公司 | Middle/low voltage bus short circuit protection method |
| CN200941542Y (en) * | 2006-07-25 | 2007-08-29 | 邢刚 | Protective breaker for fault electrical arc |
| CN101034801A (en) * | 2007-03-23 | 2007-09-12 | 上海市电力公司 | Online testing method of electrical arc light protection unit |
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| CN101752846A (en) | 2010-06-23 |
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