CN101707359A - High-capacity intelligent high-speed breaking device - Google Patents
High-capacity intelligent high-speed breaking device Download PDFInfo
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- CN101707359A CN101707359A CN200910116366A CN200910116366A CN101707359A CN 101707359 A CN101707359 A CN 101707359A CN 200910116366 A CN200910116366 A CN 200910116366A CN 200910116366 A CN200910116366 A CN 200910116366A CN 101707359 A CN101707359 A CN 101707359A
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Abstract
The invention discloses a high-capacity intelligent high-speed breaking device which mainly solves the problem of longer breaking time of the traditional breakers. Current tracking and waveform reduction principles are used by the device, short-circuit current in a grid system is adjusted in a controller in advance, and waveforms are simulated. Meanwhile, the intensity of three phases of current is detected, and the phases are compared; and if the waveforms of two phases of the current are beyond the short-circuit current waveforms adjusted in advance, the system can be judged to have a short circuit. Quick breaking reckoning and voting are finished within the time of min 55mus and max 110mus, a pulse transformer and a detonator are driven to ignite, and explosives go off and are broken within the time of min 55mus and max 110mus. The device has strong capacity of breaking the short-circuit current and can quickly break the short-circuit current within a 1/4 power frequency period wave. During breaking, the short-circuit current still lies in an initial phase and is far from an expectation value so as to ensure that electric equipment is reliably protected.
Description
Technical field
The present invention relates to a kind of breaking device that is used in generating and the big network system of electric power system, particularly short circuit current, be specifically related to a kind of high-capacity intelligent high-speed breaking device, when generating and electric power system are short-circuited, be used for the fast shut-off short circuit current.
Background technology
The existing breaking device that is used for electrical network is to detect under the prerequisite of short circuit at controller, sends and cut-offs instruction, and quick-speed turning on-off is realized damming.The controller criterion of prior art is that electric current (electric current is sinusoidal wave) rate of change is di/dt, calculate by integrating circuit, the characteristics of integrating circuit are only to spend at 0 o'clock at electric current could begin to calculate, the probability of short circuit in 0 o'clock be infinitely great minute it, the controller of prior art may detect short circuit current at first ripple hardly so, also just can not realize cut-offfing damming at 1/4 cycle.Like this in case the accident that is short-circuited is very big to the impact and the harm of system.At present, when being short-circuited, mainly be to utilize circuit breaker to come cutting-off of short-circuit electric current in generating and electric power system.Its subject matter is: the switch off time of circuit breaker is long, and does not have current-limiting function.In some cases, though circuit breaker has cut-off short circuit current, the winding of generator or transformer under the short-circuit current rush of 1～2 cycle before this by scaling loss, the domestic example that this type of accident is arranged repeatedly.
Summary of the invention
At the problem in the above-mentioned prior art; the object of the present invention is to provide a kind of high-capacity intelligent high-speed breaking device; it is a criterion with current instantaneous value and current changing rate di/dt; by current tracking and waveform are reduced; can in 1/4 power frequency cycle, short circuit current be cut off rapidly, make electric equipment obtain reliably protecting (during cut-out; short circuit current still is in initial period, reaches desired value far away).
The technical scheme that the present invention is taked for its purpose of realization is:
High-capacity intelligent high-speed breaking device comprises high-speed isolated device, special fuse and voltage limiter, and the three is connected in parallel;
Transient current transformer LH is used to detect the busbar short-circuit current signal and sends to controller in real time;
Pulse transformer is used to accept the controller firing command and igniting is cut-off the high-speed isolated device;
Described controller comprises main module, main control module, Executive Module and the high-pressure modular surveyed, and transmits data or instruction by bus system between each module.
The described main module of surveying comprises comparing unit and detecting unit; Stored in the comparing unit and adjusted the network system short circuit current in advance and simulate waveform; Detecting unit detects the intensity and the phase place of A, B, C three-phase current in real time, and the short circuit current waveform of adjusting in advance in same relatively unit compares, if any two-phase actual current is outside the short circuit current waveform of adjusting in advance, then judge network system generation phase fault immediately, it is separate to lock fault immediately, and sends instruction and signal by bus system to other module.
Described main control module is used for the data that the main survey module of real-time continual reception sends by bus system and handles differentiation; Whether the information that real-time continual differentiation receives interference signal or true short trouble signal, as differentiation be true short circuit so, then send firing command by bus system to Executive Module and high-pressure modular immediately.
Described bus system also connects with LCD screen display interface man machine operation interface, shows fault and action in real time.
The present invention utilizes current tracking and waveform reduction technique scheme, the phase place of real-time tracking equipment operation current waveform, by adjusting network system short circuit current and simulate efferent echo and compare in advance just as detecting in real time three-phase current intensity and phase place, if the waveform of biphase current is outside the short circuit current waveform of adjusting in advance, the system that then can judge is short-circuited, and can finish at min 55 μ s max 110 μ s and cut-off quick measuring and calculating voting.Pulse transformer and detonator igniting, in the 50 μ s times of 5 μ s max, explosive charge cut-offs at min.
Beneficial effect of the present invention: have the very strong ability of cut-offfing short circuit current; with current instantaneous value and current changing rate di/dt is criterion; by current tracking and waveform reduction; can be in 1/4 power frequency cycle; short circuit current is cut off rapidly, and during cut-out, short circuit current still is in initial period; reach desired value far away, make electric equipment obtain reliably protecting.
Description of drawings
The present invention is described in more detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is an electrical block diagram of the present invention;
Fig. 2 is a controller principle structural representation of the present invention;
Fig. 3 (a, b, c) for the cut-off current of apparatus of the present invention operations and deadline curve chart;
Fig. 4 the present invention is used for generator outlet short-circuit protection schematic diagram;
Fig. 5 the present invention is used for the protection schematic diagram of power plant branch bar and house substation;
Fig. 6 the present invention is used for bypass current limiting reactor schematic diagram;
Fig. 7 the present invention is used for sectionalized bus operation with closed ring schematic diagram.
Embodiment
Referring to Fig. 1, the present invention includes high-speed isolated device 3, special fuse 4 and voltage limiter 5, the three is connected in parallel; Transient current transformer LH6 is used to detect the busbar short-circuit current signal and sends to controller 2 in real time; Pulse transformer 1 is used to accept the controller firing command and igniting is cut-off the high-speed isolated device.
Circuit working principle of the present invention is as follows:
1, when network system is short-circuited, transient current transformer LH6 detects short circuit current signal and the real-time controller 2 that sends to;
2, the signal that sends over of 2 couples of transient current transformer LH6 of controller calculates comparison, and in time sends 1 igniting of instruction pulse transformer.
3, high-speed isolated device 3 cut-offs after pulse transformer 1 igniting, and at this moment short circuit current turns to special fuse 4, and 4 through-flow moments of special fuse fuse immediately, and special fuse 4 is set up very high arc voltage in fusing;
Set up very high arc voltage when 4, special fuse 4 fuses and make voltage limiter 5 open (the voltage limiter turning-on voltage is 2.4 to 2.5 times of network system voltage), voltage limiter 5 one is open-minded, the arc extinction that produces during special fuse fusing;
5, at this moment the network system short circuit current has been realized transfer, and decays to 0.The time of finishing above-mentioned whole process is in 5ms.
The main module 21 of surveying comprises comparing unit and detecting unit; Stored in the comparing unit and adjusted the network system short circuit current in advance and simulate waveform; Detecting unit detects the intensity and the phase place of A, B, C three-phase current in real time, and the short circuit current waveform of adjusting in advance in same relatively unit compares, outside the short circuit current waveform that any two-phase actual current of appearance is being adjusted in advance, then judge network system generation phase fault immediately, the locking fault is separate, and sends instruction and signal by bus system to other module.
The operation principle of controller 2:
1, main module 21 intensity and the phase place of detection A, B, C three-phase current in real time surveyed, and the short circuit current waveform of adjusting in advance together compares, if any two-phase actual current is outside the short circuit current waveform of adjusting in advance, the phase fault of decision-making system generation immediately then, and constantly transmit data to other module by STD-1000 bus system 23;
2, when main survey module 21 detected system's generation phase fault, it was separate to lock fault immediately;
3, carry out computing by main control module 22 simultaneously, send firing command, and send warning by STD-1000 bus system 23;
4, Executive Module 24 control of starting ignition immediately power drives high-pressure modular 25 energy storage after receiving instruction.
5, pulse transformer 1 and detonator igniting immediately after high-pressure modular 25 energy storage finished and cut-off.
6, LCD screen display interface 26 (man machine operation interface) shows fault and action in real time.
7, above institute in steps the deadline in the microsecond level.
The present invention uses current tracking, waveform reduction and judges locking, in 1/4 power frequency cycle, short circuit current is cut off rapidly, make electric equipment obtain reliably protecting, Fig. 3 a, b, c are illustrated in the different intervals in the power frequency cycle, the cut-off current and the deadline of device operation; Among the figure
S
1: the prospective short circuit current waveform;
S
2: the actual short current waveform;
S
3: the actual motion current peak;
S
4: starting current adds the curve of other load current sum;
S
5: the short circuit current curve of adjusting in advance;
Is: actual short electric current initial value;
Ip: the actual short electric current igniting threshold value of damming;
t
0: required time when short circuit current reaches operating value (short circuit current instantaneous value and short circuit current growth rate);
t
1: the electric current rising cut-off point time;
t
2: current attenuation is to the zero time.
The present invention has overcome the problems that circuit breaker exists.Apparatus of the present invention separate unit rated current can reach 5000A, and many uses in parallel can obtain bigger rated operational current, has the ability that is contemplated to the above short circuit current of 200kA of cut-offfing, and the actual value of short circuit current can be controlled at 20%～50% of desired value.The time of damming of cut-offfing of device only is 5ms.Drop-out current is big, and switch off time is lacked these two big characteristics, has fundamentally solved the problem of long-term puzzlement electric power system and big power consumer.Avoided huge short circuit current that the calamity of main equipment is impacted, avoided, changed the tradition of only protecting primary equipment, can satisfy the growth requirement of modern power systems by protective relaying device because of main equipment burns the large-area power-cuts that causes.The present invention is applicable to the large electricity consumer of electric power system and every profession and trade.
Below be several practical example:
1, generator outlet short-circuit protection
During the generator outlet short circuit, the short circuit current that is provided by generator is very big, and the aperiodic component proportion is nearly more than 50%, and normal circuit breaker can't be used.Present way one is an enclosed busbar, the 2nd, adopt generator definite purpose circuit breaker at high price.But the former moves dumb, and the transformer side breaker operator is frequent, the life-span short, maintenance inconvenience; Though latter's short trouble can cut-off, other electric equipment still might damage under the short circuit current effect of 1-2 cycle.
It is big that the present invention cut-offs capacity, and aperiodic component is had extremely strong connecting-disconnecting function equally, and generator, transformer are protected fast and effectively, and referring to Fig. 4, KD is apparatus of the present invention among the figure.
2, the protection of power plant branch bar and house substation
When power plant branch bar generation phase fault, generator and system provide short circuit current to the fault point simultaneously, and be bigger during the short circuit of short-circuit current ratio generator outlet, adopt the enclosed busbar investment big, the operation and maintenance inconvenience adopts the generator definite purpose circuit breaker, switch off time is long, not current limliting.Adopt the present invention to address the above problem.Excitation variation is propped up with the port of synchronous generator and is used similarly, and referring to Fig. 5, KD is apparatus of the present invention among the figure.
3, be used for the bypass current limiting reactor
There are three problems in current limiting reactor in fault current limiting, and the one, energy loss is big, and operation is a no small spending throughout the year; The 2nd, when main equipment starts, on the reactor pressure drop very big, influence power supply quality; The 3rd, reactive loss is big, and the network system power factor (PF) is descended, and needs to increase capacitor and carries out reactive power compensation.
If a playscript with stage directions contrive equipment in parallel on reactor, reactor is by short circuit during operation, and electric current is very little on the reactor, and energy consumption reduces, and can avoid big pressure drop of loading when putting into operation, and has also improved the power factor (PF) of network system simultaneously.
When system short-circuit, apparatus of the present invention quick-speed turning on-off, reactor puts into operation, and limiting short-circuit current guarantees that simultaneously the responsible consumer power supply is uninterrupted.
In newly-built network system, can strengthen the reactor impedance during design, to reduce the drop-out current of load side circuit breaker, save investment, referring to Fig. 6, KD is apparatus of the present invention among the figure.
4, be used for the sectionalized bus operation with closed ring, the investment of enlarging of reduction system or paired running
Utilize apparatus of the present invention can make the sectionalized bus operation with closed ring.This operational mode can improve power supply reliability, load that can balanced many transformers, and the pressure drop that produces in the time of reducing big stating with load guarantees power supply quality.
When network system was short-circuited, apparatus of the present invention were about to two sections buses and split quick the branch.Like this, when transformer station's enlarging or increase-volume, repacking load side circuit breaker only need consider to cut-off the short circuit current of single transformer, need not change all circuit breakers, can save investment, and referring to Fig. 7, KD is apparatus of the present invention among the figure.
Claims (4)
1. high-capacity intelligent high-speed breaking device comprises high-speed isolated device, special fuse and voltage limiter, and the three is connected in parallel;
Transient current transformer LH is used to detect the busbar short-circuit current signal and sends to controller in real time;
Pulse transformer is used to accept the controller firing command and igniting is cut-off the high-speed isolated device;
It is characterized in that described controller comprises main module, main control module, Executive Module and the high-pressure modular surveyed, and transmits data or instruction by bus system between each module.
2. high-capacity intelligent high-speed breaking device according to claim 2 is characterized in that the described main module of surveying comprises comparing unit and detecting unit; Stored in the comparing unit and adjusted the network system short circuit current in advance and simulate waveform; Detecting unit detects the intensity and the phase place of A, B, C three-phase current in real time, and the short circuit current waveform of adjusting in advance in same relatively unit compares, outside the short circuit current waveform that any two-phase actual current of appearance is being adjusted in advance, then judge network system generation phase fault immediately, the locking fault is separate, and sends instruction and signal by bus system to other module.
3. high-capacity intelligent high-speed breaking device according to claim 1 is characterized in that described main control module is used for the data that the main survey module of real-time continual reception sends by bus system and handles differentiation; Whether the information that real-time continual differentiation receives interference signal or true short trouble signal, is true short trouble as differentiation, then sends firing command by bus system to Executive Module and high-pressure modular immediately.
4. according to each described high-capacity intelligent high-speed breaking device of claim 1-3, it is characterized in that described bus system also connects with LCD screen display interface man machine operation interface, shows fault and action in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910116366A CN101707359A (en) | 2009-03-17 | 2009-03-17 | High-capacity intelligent high-speed breaking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910116366A CN101707359A (en) | 2009-03-17 | 2009-03-17 | High-capacity intelligent high-speed breaking device |
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| CN101707359A true CN101707359A (en) | 2010-05-12 |
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| CN200910116366A Pending CN101707359A (en) | 2009-03-17 | 2009-03-17 | High-capacity intelligent high-speed breaking device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222893A (en) * | 2011-06-15 | 2011-10-19 | 中电普瑞科技有限公司 | Quick fault current restrictor based on carrier isolator |
| CN103414175A (en) * | 2013-07-29 | 2013-11-27 | 西安交通大学 | Short-circuit fault current limiter |
| CN106992506A (en) * | 2017-06-02 | 2017-07-28 | 云南电网有限责任公司电力科学研究院 | A kind of fuse protection device and method applied to electromagnetic potential transformer |
| CN110045219A (en) * | 2019-04-17 | 2019-07-23 | 南宁学院 | A kind of method for detecting short circuit of current changing rate |
| CN110061471A (en) * | 2019-04-17 | 2019-07-26 | 南宁学院 | A kind of method for detecting short circuit of long range electric current |
| CN111711178A (en) * | 2020-06-02 | 2020-09-25 | 国网浙江省电力有限公司电力科学研究院 | Relay protection successive action method for cutting off overproof short-circuit current |
| CN113328418A (en) * | 2021-05-28 | 2021-08-31 | 深圳市中电电力技术股份有限公司 | Current-limiting type electrical fire protector without limit to load type |
| CN113410814A (en) * | 2021-06-09 | 2021-09-17 | 西安交通大学 | Mechanical direct current breaker state evaluation method, system and medium |
-
2009
- 2009-03-17 CN CN200910116366A patent/CN101707359A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222893A (en) * | 2011-06-15 | 2011-10-19 | 中电普瑞科技有限公司 | Quick fault current restrictor based on carrier isolator |
| CN102222893B (en) * | 2011-06-15 | 2015-08-19 | 中电普瑞科技有限公司 | A kind of fast failure demand limiter based on current-carrying isolator |
| CN103414175A (en) * | 2013-07-29 | 2013-11-27 | 西安交通大学 | Short-circuit fault current limiter |
| CN106992506A (en) * | 2017-06-02 | 2017-07-28 | 云南电网有限责任公司电力科学研究院 | A kind of fuse protection device and method applied to electromagnetic potential transformer |
| CN106992506B (en) * | 2017-06-02 | 2018-09-11 | 云南电网有限责任公司电力科学研究院 | A kind of fuse protective device and method applied to electromagnetic potential transformer |
| CN110045219A (en) * | 2019-04-17 | 2019-07-23 | 南宁学院 | A kind of method for detecting short circuit of current changing rate |
| CN110061471A (en) * | 2019-04-17 | 2019-07-26 | 南宁学院 | A kind of method for detecting short circuit of long range electric current |
| CN111711178A (en) * | 2020-06-02 | 2020-09-25 | 国网浙江省电力有限公司电力科学研究院 | Relay protection successive action method for cutting off overproof short-circuit current |
| CN113328418A (en) * | 2021-05-28 | 2021-08-31 | 深圳市中电电力技术股份有限公司 | Current-limiting type electrical fire protector without limit to load type |
| CN113410814A (en) * | 2021-06-09 | 2021-09-17 | 西安交通大学 | Mechanical direct current breaker state evaluation method, system and medium |
| CN113410814B (en) * | 2021-06-09 | 2022-08-16 | 西安交通大学 | Mechanical direct current breaker state evaluation method, system and medium |
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Open date: 20100512 |