CN103490373A - Method for preventing misoperation of breaker and breaker - Google Patents
Method for preventing misoperation of breaker and breaker Download PDFInfo
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- CN103490373A CN103490373A CN201310400729.3A CN201310400729A CN103490373A CN 103490373 A CN103490373 A CN 103490373A CN 201310400729 A CN201310400729 A CN 201310400729A CN 103490373 A CN103490373 A CN 103490373A
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Abstract
The invention discloses a method for preventing misoperation of a breaker, and belongs to the technical field of electric safety. According to the method for preventing the misoperation of the breaker, real-time detection is carried out on the working states of a current mutual inductor through a mutual inductor detection module, when the working states of the current mutual inductor are detected to be abnormal, only alarm is given out on the faults monitored by the current mutual inductor at the moment, while tripping is not carried out, and when the working states of the current mutual inductor are detected to be normal, normal protection is carried out on the faults monitored by the controller of the breaker at the moment. The invention further discloses a breaker. The method for preventing the misoperation of the breaker and the breaker can effectively prevent the misoperation of the breaker caused by abnormal working of the current mutual inductor, and therefore the overall reliability of the breaker is improved. Further, the method for preventing the misoperation of the breaker and the breaker are easy to implement.
Description
Technical field
The present invention relates to a kind of method that prevents the circuit breaker misoperation, belong to the electrical safety technical field.
Background technology
Circuit breaker is the critical elements in low-voltage distribution system, and its functional reliability is self-evident.Intelligent controller, as the central component of circuit breaker, is to realize the intelligentized core of circuit breaker.Current transformer (Current Transformer) is called for short CT, and it act as the heavy current in electric power system (the primary current value of current transformer) is for conversion into to the weak current (the secondary electric flow valuve of current transformer) that suitable relay uses.There is irreplaceable status since current transformer is long-term in current measurement and relaying protection.In low-voltage intelligent circuit breaker, usually by measuring coil and energy coil two parts, formed.Whole current transformer is enclosed within on circuit breaker major loop bus, and the voltage of measuring coil induction output is numerically linear with primary current, as the on-line parameter of intelligent controller, measures and the guard signal input.The energy coil induces self electromotive force as one of intelligent controller working power.After current transformer circuit supervision fail, particularly measuring coil broken string, not only can affect the measurement of intelligent breaker to parameters of electric power such as electric current, power, also can cause having ground protection when serious, the circuit breaker misoperation of the functions such as current imbalance protection, open phase protection.
In the prior art, most of intelligent breakers all do not have the measuring ability to the current transformer state; And minority is also just sent corresponding alarm signal with the circuit breaker of current transformer status detection function when current transformer circuit supervision fail being detected, can not effectively prevent from causing the circuit breaker misoperation because of current transformer circuit supervision fail.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiency that existing circuit breaker can not effectively prevent from causing because of the fault of current transformer own the circuit breaker misoperation, a kind of method and a kind of circuit breaker that prevents the circuit breaker misoperation is provided, can effectively prevents the circuit breaker misoperation that the fault of current transformer own causes.
The present invention specifically solves the problems of the technologies described above by the following technical solutions:
A kind of method that prevents the circuit breaker misoperation, described circuit breaker comprises intelligent controller, current transformer, trip gear, current transformer being for carrying out Real-Time Monitoring and monitoring result is transferred to intelligent controller bus current, and intelligent controller judges whether to control the trip gear action of threading off according to the monitoring result of current transformer output; Described circuit breaker also comprises the instrument transformer detection module that carries out real-time detection for the operating state to described current transformer; When the monitoring result of intelligent controller reception exceeds default normal range (NR), intelligent controller judges that according to the testing result of instrument transformer detection module output whether the operating state of current transformer is normal, as normal as the operation of current transformers state, intelligent controller sends alarm signal and controls the trip gear action of threading off; As the operation of current transformers abnormal state, intelligent controller only sends alarm signal.
A kind of circuit breaker, comprise intelligent controller, current transformer, trip gear, current transformer being for carrying out Real-Time Monitoring and monitoring result is transferred to intelligent controller bus current, and intelligent controller judges whether to control the trip gear action of threading off according to the monitoring result of current transformer output; Described circuit breaker also comprises the instrument transformer detection module that carries out real-time detection for the operating state to described current transformer; When intelligent controller receive monitoring result while exceeding default normal range (NR), intelligent controller judges that according to the testing result of instrument transformer detection module output whether the operating state of current transformer is normal, as normal as the operation of current transformers state, intelligent controller sends alarm signal and controls the trip gear action of threading off; As the operation of current transformers abnormal state, intelligent controller only sends alarm signal.
Compared to existing technology, technical solution of the present invention has following beneficial effect:
One, can effectively prevent because operation of current transformers causes the misoperation of circuit breaker extremely, thus the global reliability of raising circuit breaker;
Two, technical solution of the present invention, without the hardware circuit that increases intelligent controller, realizes simply, can be effectively cost-saving.
The accompanying drawing explanation
The principle schematic that Fig. 1 is the inventive method;
The controller part-structure block diagram that Fig. 2 is circuit breaker of the present invention;
The control flow that Fig. 3 is circuit breaker of the present invention when the monitoring result of current transformer output is abnormal;
Fig. 4 is the control flow of circuit breaker of the present invention when the monitoring result of current transformer output shows earth fault;
Fig. 5 is the control flow of circuit breaker of the present invention when the monitoring result of current transformer output shows the current imbalance fault;
Fig. 6 is the control flow of circuit breaker of the present invention when the monitoring result of current transformer output shows open phase fault.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated:
Whether thinking of the present invention is to utilize the instrument transformer detection module normally to detect in real time the operating state of the current transformer in circuit breaker, and judges whether to carry out corresponding protection action according to testing result.
Of the present inventionly prevent circuit breaker misoperation Method And Principle as shown in Figure 1, intelligent controller is sampled to the signal of instrument transformer detection module, judge that whether the operation of current transformers state is normal: if undesired, for the fault (such as earth fault, open phase fault, current imbalance fault etc.) that now current transformer monitors, only report to the police, be failure to actuate; If normal, for the fault (such as earth fault, open phase fault, current imbalance fault etc.) that now current transformer monitors, according to normal condition, protected.
Instrument transformer detection module in technical solution of the present invention can adopt various existing techniques in realizing, for example, a kind of current diagnosis device and diagnostic method thereof for monitoring current instrument transformer state described in one piece of Chinese invention patent application that application number is 20111005974.8, add an earth resistance between current transformer and current signal Acquisition Circuit, differentiate current transformer by the output voltage of sensed current signal modulate circuit and whether break.Whether the Chinese invention patent application that another piece of application number is 20101056781.4 has been described a kind of current transformer circuit supervision fail detection method, by software, current sampling signal calculated and relatively differentiate current transformer and break.
Fig. 2 has shown the structure of breaker controller part of the present invention, microprocessor receives the voltage collection circuit be connected with current transformer, the system power information that current collection circuit collects, control trip circuit according to the Protection parameters of setting, thereby realize the defencive function of circuit breaker; Display circuit is for the measured values such as electric current, voltage that show circuit breaker, protection setting value, service data etc.As shown in the figure, this circuit breaker also comprises the instrument transformer detection module be connected with microprocessor signals, can detect in real time the operating state of instrument transformer, and by the transfer of data that detects to microprocessor.
Fig. 3 has shown the control flow of circuit breaker of the present invention when the monitoring result of current transformer output is abnormal, as shown in the figure: at first carry out initialization; Then controller is sampled to the operation of current transformers state by the instrument transformer detection module; If sampled result is that state is undesired, the fault judged for the monitor signal according to current instrument transformer output is only reported to the police, and does not thread off, and then returns to sampling instrument transformer detection module signals step; If sampled result is that state is normal, carry out normal error protection program, then return to sampling instrument transformer detection module signals step.
In order just with the public, further to understand technical scheme of the present invention, the circuit breaker of the present invention of below take respectively shows that in the monitoring result of current transformer output earth fault, current imbalance fault and open phase fault situation are example, describes specific implementation of the present invention in detail.
Fig. 4 has shown the control flow of circuit breaker of the present invention when the monitoring result of current transformer output shows earth fault, as shown in the figure, controller according to the signal of instrument transformer detection module to the judgement of sampling of operation of current transformers state.In system, during the actual motion current balance type, if it is undesired now to detect the current transformer state of certain phase current, deviation appears in this phase current mutual inductor secondary, can not truly reflect actual current, according to earth current
controller can monitor the earth current of certain numerical value, if the earth current monitored has surpassed the setting value of default landing operation, the earth fault indicator light of controller sends the flicker of reporting to the police.Simultaneously, because the current transformer state is undesired, corresponding mulual inductor malfunction indicator light also can send the flicker of reporting to the police.At controller in the middle of default program, when monitoring earth current and be greater than default landing operation setting value, the landing operation time starts to add up, and each cumulative numerical value is an electric current cycle period.Because this earth current is not truly to produce in the middle of circuit, but because current transformer causes extremely, so the user does not wish now the circuit breaker protection of threading off, that is to say if now circuit breaker moves can be classified as the category of misoperation.Generation for fear of this type of misoperation, controller is in the situation that the current transformer abnormal state detected, to deduct on every cycle period docking ground corresponding numerical value operate time, like this can be so that the cumulative setting value less than the landing operation time of landing operation time just can not send the dropout instruction yet.For example, the rated current In of this circuit breaker is 1600A, and the real work electric current is 1600A, and operating frequency is 50Hz, and the landing operation current setting is 800A, and landing operation time setting value is 400ms.If now the A phase current mutual inductor breaks, due to three-phase imbalance, system will monitor the earth fault current of 1600A.Because earth fault current is greater than the landing operation current setting, the earth fault indicator light starts flicker, and the simultaneous ground fault time starts take 20ms and starts to add up as the cycle.But, because this earth fault current is to be caused by transformer disconnection, so pre-set programs will deduct 20ms in each cycle, the earth fault time can't be added to landing operation time setting value so simultaneously.That is to say, at current transformer, under abnormal state, circuit breaker will only be reported to the police, and be failure to actuate, and so just reach the purpose that prevents the circuit breaker misoperation.
Fig. 5 has shown the control flow of circuit breaker of the present invention when the monitoring result of current transformer output shows the current imbalance fault, as shown in the figure, controller according to instrument transformer detection module signal to the judgement of sampling of operation of current transformers state.In system, during the actual motion current balance type, if it is undesired now to detect the current transformer state of certain phase current, deviation appears in this phase current mutual inductor secondary output voltage, can not truly reflect actual current, according to three-phase current degree of unbalance not:
Wherein,
N is the number of phases, I
ibe the electric current (being A, B, C phase) of each phase, controller can monitor the current unbalance factor of certain numerical value.If the current unbalance factor detected has surpassed the default threshold value of adjusting, the current imbalance faulty indication lantern festival of controller is sent the flicker of reporting to the police.Simultaneously, because the current transformer state is undesired, corresponding malfunction indicator lamp also can be sent the flicker of reporting to the police.At controller in the middle of default program, be greater than default adjusting during threshold value when monitoring current unbalance factor, current imbalance starts to add up operate time, and each cumulative numerical value is an electric current cycle period.Because this current imbalance is not truly to produce in the middle of circuit, but because current transformer causes extremely, so the user does not wish now the circuit breaker protection of threading off, that is to say if now circuit breaker moves can be classified as the category of misoperation.Generation for fear of this type of misoperation, controller is in the situation that current transformer to be detected abnormal, to deduct on every cycle period docking ground corresponding numerical value operate time, like this can be so that the current imbalance cumulative threshold value of adjusting less than operate time operate time just can not sent the dropout instruction yet.For example, the rated current of this circuit breaker is 1600A, and the real work electric current is 1600A, and operating frequency is 50Hz, and the current imbalance action threshold value of adjusting is 80%, and the threshold value of adjusting operate time is 40s.If now the A phase current mutual inductor breaks, due to three-phase imbalance, the system power degree of unbalance will be 200%.Because current unbalance factor 200% is greater than the threshold value 80% of adjusting, the current imbalance malfunction indicator lamp starts flicker, and simultaneously current imbalance starts take 20ms fault time and starts to add up as the cycle.But, because this current imbalance fault current is to be caused by mulual inductor malfunction, so pre-set programs will deduct 20ms simultaneously in each cycle, current imbalance can't be added to the current imbalance threshold value of adjusting operate time fault time like this.That is to say, at current transformer, under abnormal state, circuit breaker will only be reported to the police, and be failure to actuate, and so just reach the purpose that prevents the circuit breaker misoperation.
Fig. 6 has shown the control flow of circuit breaker of the present invention when the monitoring result of current transformer output shows open phase fault, due to the open phase fault extreme case that is current imbalance, therefore operation principle, with preventing the misoperation of current imbalance fault, repeats no more herein.
Claims (2)
1. a method that prevents the circuit breaker misoperation, described circuit breaker comprises intelligent controller, current transformer, trip gear, current transformer being for carrying out Real-Time Monitoring and monitoring result is transferred to intelligent controller bus current, and intelligent controller judges whether to control the trip gear action of threading off according to the monitoring result of current transformer output; It is characterized in that, described circuit breaker also comprises the instrument transformer detection module that carries out real-time detection for the operating state to described current transformer; When the monitoring result of intelligent controller reception exceeds default normal range (NR), intelligent controller judges that according to the testing result of instrument transformer detection module output whether the operating state of current transformer is normal, as normal as the operation of current transformers state, intelligent controller sends alarm signal and controls the trip gear action of threading off; As the operation of current transformers abnormal state, intelligent controller only sends alarm signal.
2. a circuit breaker, comprise intelligent controller, current transformer, trip gear, current transformer being for carrying out Real-Time Monitoring and monitoring result is transferred to intelligent controller bus current, and intelligent controller judges whether to control the trip gear action of threading off according to the monitoring result of current transformer output; It is characterized in that, described circuit breaker also comprises the instrument transformer detection module that carries out real-time detection for the operating state to described current transformer; When intelligent controller receive monitoring result while exceeding default normal range (NR), intelligent controller judges that according to the testing result of instrument transformer detection module output whether the operating state of current transformer is normal, as normal as the operation of current transformers state, intelligent controller sends alarm signal and controls the trip gear action of threading off; As the operation of current transformers abnormal state, intelligent controller only sends alarm signal.
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| CN201310400729.3A CN103490373B (en) | 2013-09-06 | 2013-09-06 | A kind of method preventing breaker misoperation and a kind of breaker |
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| CN201310400729.3A CN103490373B (en) | 2013-09-06 | 2013-09-06 | A kind of method preventing breaker misoperation and a kind of breaker |
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| CN104267344A (en) * | 2014-10-27 | 2015-01-07 | 国家电网公司 | Breaker trip detection method based on predicated mutation information |
| CN105425092A (en) * | 2015-11-17 | 2016-03-23 | 高新兴科技集团股份有限公司 | Method for judging network cabinet tripping |
| CN108322883A (en) * | 2017-12-21 | 2018-07-24 | 惠州市德赛西威汽车电子股份有限公司 | A kind of vehicle audio quiescent current automatization test system and method |
| CN109155517A (en) * | 2016-05-20 | 2019-01-04 | 三菱电机株式会社 | Breaker |
| CN111693800A (en) * | 2020-05-09 | 2020-09-22 | 国网湖南省电力有限公司 | Action characteristic test method and circuit of leakage protection action device |
| CN115113097A (en) * | 2021-03-23 | 2022-09-27 | 上海良信电器股份有限公司 | Broken wire detection device and system |
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| CN111693800A (en) * | 2020-05-09 | 2020-09-22 | 国网湖南省电力有限公司 | Action characteristic test method and circuit of leakage protection action device |
| CN115113097A (en) * | 2021-03-23 | 2022-09-27 | 上海良信电器股份有限公司 | Broken wire detection device and system |
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| CN103490373B (en) | 2016-08-17 |
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