CN117665551A - Breaker mechanical characteristic monitoring method and device based on current characteristics in opening process - Google Patents
Breaker mechanical characteristic monitoring method and device based on current characteristics in opening process Download PDFInfo
- Publication number
- CN117665551A CN117665551A CN202310566543.9A CN202310566543A CN117665551A CN 117665551 A CN117665551 A CN 117665551A CN 202310566543 A CN202310566543 A CN 202310566543A CN 117665551 A CN117665551 A CN 117665551A
- Authority
- CN
- China
- Prior art keywords
- current
- circuit breaker
- time
- coil
- iron core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000008569 process Effects 0.000 title claims abstract description 25
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 230000009471 action Effects 0.000 claims abstract description 44
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 238000012806 monitoring device Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 61
- 230000001965 increasing effect Effects 0.000 claims description 29
- 238000005070 sampling Methods 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000004927 fusion Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a breaker mechanical characteristic monitoring method based on a breaking process current characteristic, which relies on the existing two-time fusion matched feeder terminal equipment, acquires the time-phase current and breaking coil current data of the breaker in real time through collecting the current waveform data action characteristic extraction algorithm to acquire the breaker action time characteristic parameter, and obtains the typical current waveform of the breaker breaking coil in action, thereby obtaining the breaker mechanical characteristic state and solving the problems of the breaker mechanical characteristic monitoring use cost and environmental influence. The invention also provides a corresponding breaker mechanical characteristic monitoring device based on the current characteristics of the breaking process.
Description
Technical Field
The invention belongs to the technical field of power distribution network online monitoring, and particularly relates to a method and a device for monitoring mechanical characteristics of a circuit breaker based on current characteristics in a breaking process.
Background
The circuit breaker is one of main equipment of the power distribution network, has the main function of rapidly cutting off isolation faults, ensures the normal operation of the power distribution network system, and has important significance on the stable and safe operation of the power system in the operation state. The mechanical characteristics are important indexes reflecting the working state of the circuit breaker, and by means of the mechanical characteristics, the working parameter change and mechanical faults of the mechanical structure of the circuit breaker can be judged, and whether the work of the arc extinguishing system is normal or not is also related. Therefore, knowing and grasping the mechanical characteristics of the circuit breaker and the variation trend thereof plays a significant role in the development of the power system.
The existing mechanical characteristic monitoring of the circuit breaker is mainly added with a displacement sensor, an acceleration sensor, a temperature sensor and the like, and the mechanical characteristic state of the circuit breaker is indirectly reflected by detecting the movement distance, the speed, the temperature change and the like of the switch of the circuit breaker. The mode increases the use cost, and meanwhile, the detection result is limited by the external environment and the precision of the sensor, so that the error is larger.
Disclosure of Invention
The invention aims to solve the technical problems that: the data acquired by the third-party sensor device indirectly reflects the mechanical characteristics of the circuit breaker, and the error is larger due to the influence of the external environment and the accuracy of the sensor, and meanwhile, the use cost is increased.
To achieve the above object, according to one aspect of the present invention, there is provided a method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process, the method comprising the steps of:
obtaining the starting time t of the opening action of the circuit breaker 0 The starting time t of the breaking action of the breaker 0 When a line fails or a control command is issued, the circuit breaking coil loop of the breaker is controlled to conduct to generate current;
obtaining the current stop increasing time t 1 The current stops increasing at time t 1 The method is characterized in that the iron core starts to move, counter electromotive force is generated by movement and prevents the current of the coil from increasing, and the counter electromotive force increases along with the increase of the movement speed of the iron core until the voltage reaches balance and the current stops increasing;
obtaining the moment t 'of striking the trip bar by the iron core' 1 The moment t 'of the iron core striking and tripping half shaft' 1 The time when the iron core moves to strike the tripping rod of the circuit breaker under the action of electromagnetic attraction force;
obtaining the current stop increasing time t 2 The current isStop increasing time t 2 The circuit breaker switch starts to act after the iron core touches the tripping rod, the iron core receives the elastic force of the spring and the reaction force of the tripping rod, the movement speed is reduced, the counter electromotive force is reduced until the voltage reaches balance, and the current stops to drop;
obtaining the moment t 'when the circuit breaker finishes the breaking action to cut off the circuit' 2 The circuit breaker completes the breaking action to cut off the line at the time t' 2 The circuit breaker is switched on and off for one time, the circuit is cut off, and the current value of each phase is reset to zero;
definition Δt 1 ＝t 2 -t 1 The difference reflects the mechanical characteristic performance of the action starting component of the circuit breaker;
definition of Deltat' 1 ＝t′ 2 -t′ 1 The time difference reflects the mechanical property performance of the breaking and extinguishing time of the breaker;
definition Δt=t' 2 -t 1 To reflect the mechanical properties of the circuit breaker as a whole.
In one embodiment of the invention, based on the existing feeder terminal, three-phase current (i an 、i bn 、i cn ) Zero sequence current (i 0n ) Switching coil current (i) n ) Waveform data and a buffer for current waveform feature extraction.
In one embodiment of the invention, at t 0 ～t 1 In the early stage, the electromagnetic attraction force born by the iron core is smaller than the reaction force of the return spring and the self weight, the iron core does not move, the current increases exponentially, and the starting moment of the coil is judged and confirmed through the current abrupt change difference value of the coil current at the current sampling moment, delta i n ＝|i n -i n+1 |-|i n -i n-1 I, in which Δi n I is the current abrupt change difference value of the coil at the current sampling moment n For the current sampling value at the current nth interval, when delta i n ＞α t0 At this time, the coil start time t is confirmed 0 ，α t0 To activate the threshold.
In one embodiment of the invention, at t 0 ～t 1 Later stage, when the electromagnetic attraction force is largeWhen the counter force is applied, the iron core starts to move, and the movement generates counter electromotive force which prevents the current of the coil from increasing, and the counter electromotive force increases along with the increase of the movement speed of the iron core, but when the counter electromotive force does not take the dominant role, the current of the coil continues to increase until the voltage reaches balance, and the current stops increasing
Beta in n I is the characteristic parameter of the current direction of the coil at the current sampling moment n For the current sampling value at the current nth interval, when beta n When the current is more than 0, the balance of the coil voltage is confirmed, and the current stops increasing at a moment t 1 。
In one embodiment of the invention, t 1 ～t 2 In the early stages, the core speed continues to increase, the back emf dominates, and the coil current begins to drop locally.
In one embodiment of the invention, t 1 ～t 2 At the later stage, the iron core touches the trip bar, at the moment, the breaker switch starts to act, the iron core receives the elastic force of the return spring and the reaction force of the trip bar, the movement speed is reduced until the iron core moves to the maximum stroke, the iron core is kept at the position, and the current stops descending.
In one embodiment of the present invention, confirming the current stop falling time t according to the current direction characteristic parameter 2 。
In one embodiment of the invention, t 2 ～t 3 At this time, the coil inductance is changed into a constant, the coil current rises exponentially to a steady-state value determined by the supply voltage and the coil internal resistance, and at t' 2 When the circuit breaker is switched on and off once, the circuit is cut off by the switching action, the current value of each phase is reset to zero, and f (t 'is satisfied' 2 ) It is required that the first and second heat exchangers,zero drift threshold value collected during line cutting>t 3 And the auxiliary contact of the circuit breaker is disconnected at the moment, and the switching-on/off coil control loop is cut off.
In one embodiment of the invention, the method further comprises:
when the factory test is carried out, firstly, N times of breaker opening operation tests are carried out under the condition of no load current, and the characteristic time average value delta t under the condition of no current is extracted 1(0) And record and save
The circuit breaker performs Δt for the rated current, the 2-time rated current, and the load current of N-time rated current, respectively 1(1) 、Δt 1(2) 、...Δt 1(N) Extracting characteristics, carrying out correction analysis on the characteristics and the no-current condition, and obtaining the influence coefficient of the load current of the breaker on the switch action time through a self-adaptive algorithmWherein->Coefficient of useAnd correcting the load current action time in the actual application process, reducing the influence of the load current, and obtaining the corrected breaker action time delta t to monitor the mechanical property performance of the breaker.
According to another aspect of the invention, there is also provided a circuit breaker mechanical characteristic monitoring device based on a current characteristic of a breaking process, including at least one processor and a memory, the at least one processor and the memory being connected by a data bus, the memory storing instructions to be executed by the at least one processor, the instructions, after being executed by the processor, being configured to perform the circuit breaker mechanical characteristic monitoring method based on the current characteristic of the breaking process.
In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
based on the existing standard feeder terminal equipment, the invention does not need to additionally add other third-party sensor equipment, thereby reducing the use cost; meanwhile, the feeder terminal collects phase current and switching-off current waveform data of the circuit breaker through a secondary fusion standard avionics cable interface, so that excessive influence of external environment is avoided.
Drawings
FIG. 1 is a schematic diagram of a secondary control loop of an interrupt circuit mechanical structure according to an embodiment of the present invention; wherein 1-an operating power supply; 2-time delay off time relay; 3-controlling a switch; 4-switching action coil combination (generally a package shell with embedded magnet); 5-coil; 6-a return spring; 7-an iron core; 8-a trip bar;
FIG. 2 is a schematic diagram of typical current waveforms during the breaking of the breaker switch-off coil according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention relates to a secondary fused on-column circuit breaker and matched standardized feeder terminal FTU equipment, in particular to a scheme for monitoring mechanical characteristics of a primary on-column circuit breaker by using feeder terminal equipment. In order to solve the problems existing in the prior art, the invention adopts the following technical scheme:
the power distribution network always requires to design a standardized secondary fusion scheme of the primary on-column circuit breaker and the secondary feeder terminal, the related technology of the primary on-column circuit breaker and the secondary on-column circuit breaker is relatively mature at present, and market bidding application basically requires a mode of using the secondary on-column circuit breaker. As shown in fig. 1, a secondary control loop of a mechanical structure of an interrupt circuit breaker is shown, a start control switch 3 is turned on, the secondary loop is turned on, a coil 5 generates electromagnetic force to drive a core 7 to move, when the core 7 moves to collide with a trip bar 8, the trip of the interrupt circuit breaker is triggered to work to release a main contact, the break operation is completed under the action of a break spring at the primary side of the interrupt circuit breaker, and then the interrupt circuit breaker returns under the action of a return spring 6. The secondary circuit is connected and then has larger current, so that the secondary circuit cannot be in a connection state for a long time, and the time relay 2 delays to disconnect the circuit after the opening and closing of the circuit breaker are finished.
The invention provides feeder terminal equipment which depends on the existing secondary fusion matching, and obtains the action time characteristic parameters of a circuit breaker by collecting the phase current and the opening coil current data of the circuit breaker in real time and extracting the action characteristic of the current waveform data, as shown in a typical current waveform of the opening coil action of the circuit breaker shown in fig. 2, so as to obtain the mechanical characteristic state of the circuit breaker, and solve the problems of the mechanical characteristic monitoring use cost and the environmental influence of the circuit breaker.
The invention provides a breaker mechanical characteristic monitoring method based on a breaking process current characteristic, which comprises the following steps:
(1) Obtaining the starting time t of the opening action of the circuit breaker 0 The starting time t of the breaking action of the breaker 0 When a line fails or a control command is issued, a secondary control loop of the control circuit breaker controls a switch 3 to be closed, and the loop is conducted to generate current;
first, the feeder terminal is provided with a three-phase current (i a 、i b 、i c ) Zero sequence current (i 0 ) And an acquisition interface of a switching-off coil current (i) channel. Real-time sampling i by using high-precision sampling AD chip in feeder terminal an 、i bn 、i cn 、i 0n 、i n And data are cached, and real-time characteristic extraction is carried out on the sampling waveform data of the breaker opening coil current i.
The electromagnetic attraction force exerted on the iron core 7 drives the iron core 7 to move towards the trip bar 8, the return spring 6 generates resistance to reversely limit the iron core 7 to move towards the trip bar 8, and the iron core is mostly transversely arranged and needs to overcome the gravity of the iron core to be relatively small. The electromagnetic attraction force applied by the front-stage iron core is smaller than the acting force of the return spring and the self weight, the iron core does not move, the current increases exponentially, and when the root sampling abrupt change difference value meets the starting threshold value, the starting moment t of the opening action of the circuit breaker is confirmed 0 。
(2) Obtaining the current stop increasing time t 1 The current stops increasing at time t 1 The iron core 7 starts to move towards the trip bar 8, back electromotive force is generated by movement, coil current is prevented from increasing, the back electromotive force increases along with the increase of the moving speed of the iron core until the voltage reaches balance, and the current stops increasing;
when the electromagnetic attraction force is larger than the reaction force, the iron core starts to move, counter electromotive force is generated by movement, the counter electromotive force prevents the current of the coil from increasing, the counter electromotive force increases along with the increase of the movement speed of the iron core, but when the counter electromotive force does not take the dominant role, the current of the coil continues to increase until the voltage reaches balance, and the current stops increasing. The characteristic parameters of the current of the opening coil are tracked and extracted in real time, the current increase and change of the current coil are analyzed, and when the current stops increasing and has a descending trend, the current stop increasing time t is confirmed 1 。
(3) Obtaining the moment t 'when the iron core 7 impacts the trip bar 8' 1 The moment t 'when the iron core impacts the trip bar' 1 The time when the iron core moves to strike the tripping rod of the circuit breaker under the action of electromagnetic attraction force;
when the core speed continues to increase, the back emf dominates and the coil current begins to drop locally, at t 1 The iron core is contacted with the trip bar at the moment, the main contact is released by the trip device of the circuit breaker, the switch starts to break under the action of the breaking spring at the primary side of the circuit breaker, the iron core receives the elasticity of the return spring and the reaction force of the trip bar, the movement speed is reduced, the counter electromotive force is reduced until the voltage reaches balance, the current stops to be reduced until the iron core moves to the maximum travel position, and the iron core is kept at the position.
(4) Obtaining the current stop increasing time t 2 The current stops increasing at time t 2 After the iron core 7 touches the tripping rod 8, the circuit breaker trips, the circuit breaker starts to break the brake once, the iron core receives the elasticity of the return spring 6 and the reaction force of the tripping rod, the movement speed is reduced, the counter electromotive force is reduced until the voltage reaches balance, and the current stops to drop;
analyzing the current falling change of the current coil through the characteristic parameters of the current of the switching-off coil, and confirming the current stopping and increasing time t when the current stops falling and has an ascending trend 2 。
(5) Obtaining the moment t 'when the circuit breaker finishes the breaking action to cut off the circuit' 2 The circuit breaker completes the breaking action to cut off the line at the time t' 2 The circuit breaker is switched on and off for one time, the circuit is cut off, and the current value of each phase is reset to zero;
at this time, the coil inductance is changed into a constant, the coil current rises exponentially to a steady-state value determined by the supply voltage and the coil internal resistance, at t' 2 When the circuit breaker finishes breaking action to cut off the circuit, the current value of each phase returns to zero, and the characteristic parameters of the phase current and the zero sequence current of the circuit breaker are tracked and extracted in real time to confirm the t' 2 Time of day.
(6) Definition Δt 1 ＝t 2 -t 1 The difference reflects the mechanical characteristic performance of the action starting component of the circuit breaker; definition of Deltat' 1 ＝t′ 2 -t′ 1 The time difference reflects the mechanical property performance of the breaking and extinguishing time of the breaker; definition Δt=t' 2 -t 1 To reflect the mechanical properties of the circuit breaker as a whole.
The technical scheme of the invention is further described in detail below, and based on the existing feeder terminal, three-phase current (i an 、i bn 、i cn ) Zero sequence current (i 0n ) Switching coil current (i) n ) Waveform data and a buffer for current waveform feature extraction.
Analysis of the secondary control loop of a circuit breaker a typical inductive circuit from a circuit point of view is shown in fig. 1, the loop voltage equation of which is as follows:
wherein U is the voltage of the secondary control loop operation power supply 1, i is the control loop current, R is the control loop internal resistance, L is the control loop inductance,Back electromotive force caused by movement of the iron core;
extracting current waveform characteristics:
t 0 ～t 1 the electromagnetic attraction force received by the iron core 7 in the early stage is smaller than the reaction force of the return spring 6 and the self weight, the iron core does not move, the current increases exponentially, and the starting moment of the coil is judged and confirmed through the current abrupt change difference value of the coil current at the current sampling moment
Δi n ＝|i n -i n+1 |-|i n -i n-1 |
In Deltai n I is the current abrupt change difference value of the coil at the current sampling moment n For the current sampling value at the current nth interval, when delta i n ＞α t0 At this time, the coil start time t is confirmed 0 ，α t0 To activate the threshold.
t 0 ～t 1 Later in the phase when the electromagnetic attraction force is greater than the reaction force, the iron core 7 starts to move, and the movement generates counter electromotive force which increases with the increase of the movement speed of the iron core and prevents the increase of the coil current, but when the counter electromotive force does not take the dominant role, the coil current continues to increase until the voltage reaches balance, and the current stops increasing
Beta in n I is the characteristic parameter of the current direction of the coil at the current sampling moment n For the current sampling value at the current nth interval, when beta n When the current is more than 0, the balance of the coil voltage is confirmed, and the current stops growingTime t 1 。
t 1 ～t 2 The core speed continues to increase early in the phase, the back emf dominates and the coil current begins to drop locally.
t 1 ～t 2 Late stage (t' 1 ) The iron core 7 contacts the trip bar 8, at this time, the breaker starts to break the brake once, and the iron core 7 receives the elastic force of the return spring 6 and the reaction force of the trip bar 8, the moving speed is reduced until the iron core moves to the maximum stroke and is kept at the position, the current stops to drop,
by the same method, the current stopping and descending time t is confirmed through the current direction characteristic parameters 2 。
t 2 ～t 3 At this time, the coil inductance is changed into a constant, the coil current rises exponentially to a steady-state value determined by the supply voltage and the coil internal resistance, and at t' 2 When the circuit breaker is switched on and off once, the circuit is cut off by the switching action, the current value of each phase is reset to zero, and f (t 'is satisfied' 2 ) It is required that the first and second heat exchangers,zero drift threshold value collected during circuit cutting
t 3 Auxiliary contact of circuit breaker is disconnected at moment, and switching-on/off coil control loop is cut off
The current waveform characteristics are associated with mechanical properties:
Δt 1 ＝t 2 -t 1 the difference value is used for reflecting the mechanical characteristic performance of the action starting component of the circuit breaker
Δt′ 1 ＝t′ 2 -t′ 1 The time difference is used for reflecting the mechanical property performance of the breaking and extinguishing time of the circuit breaker
So overall definition Δt=t' 2 -t 1 To reflect the mechanical property performance of the breaker as a whole
Load current correction:
considering the influence of load current on switch opening and arcing, when the factory test is carried out, firstly, 10 times of breaker opening operation tests are carried out under the condition of no load current, and the characteristic time average value delta t under the condition of no current is extracted (0) And record and save
The circuit breaker performs Δt for load currents of rated current (In), 2 times rated current (2 In), and..10 times rated current (10 In), respectively (1) 、Δt (2) 、...Δt (10) Extracting characteristics, carrying out correction analysis on the characteristics and the no-current condition, and obtaining the influence coefficient of the load current of the breaker on the switch action time through a self-adaptive algorithm
Coefficient of useThe action time delta t obtained by the breaker opening action under the load current in the practical application process (m) And carrying out secondary compensation conversion, reducing the influence of load current, and obtaining corrected action time delta t of the circuit breaker to monitor the mechanical property performance of the circuit breaker.
The invention further provides a breaker mechanical characteristic monitoring device based on the current characteristics of the breaking process, which comprises at least one processor and a memory, wherein the at least one processor and the memory are connected through a data bus, the memory stores instructions executed by the at least one processor, and the instructions are used for completing the breaker mechanical characteristic monitoring method based on the current characteristics of the breaking process after being executed by the processor.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process, the method comprising the following steps:
obtaining the starting time t of the opening action of the circuit breaker 0 The starting time t of the breaking action of the breaker 0 When a line fails or a control command is issued, the circuit breaking coil loop of the breaker is controlled to conduct to generate current;
obtaining the current stop increasing time t 1 The current stops increasing at time t 1 The method is characterized in that the iron core starts to move, counter electromotive force is generated by movement and prevents the current of the coil from increasing, and the counter electromotive force increases along with the increase of the movement speed of the iron core until the voltage reaches balance and the current stops increasing;
obtaining the moment t 'of striking the trip bar by the iron core' 1 The moment t 'of the iron core striking and tripping half shaft' 1 The time when the iron core moves to strike the tripping rod of the circuit breaker under the action of electromagnetic attraction force;
obtaining the current stop increasing time t 2 The current stops increasing at time t 2 The circuit breaker switch starts to act after the iron core touches the tripping rod, the iron core receives the elastic force of the spring and the reaction force of the tripping rod, the movement speed is reduced, the counter electromotive force is reduced until the voltage reaches balance, and the current stops to drop;
obtaining the moment t 'when the circuit breaker finishes the breaking action to cut off the circuit' 2 The circuit breaker completes the breaking action to cut off the line at the time t' 2 The circuit breaker is switched on and off for one time, the circuit is cut off, and the current value of each phase is reset to zero;
definition Δt 1 ＝t 2 -t 1 The difference reflects the mechanical characteristic performance of the action starting component of the circuit breaker;
definition of Deltat' 1 ＝t′ 2 -t′ 1 The time difference reflects the mechanical property performance of the breaking and extinguishing time of the breaker;
definition Δt=t' 2 -t 1 To reflect the mechanical properties of the circuit breaker as a whole.
2. The method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process according to claim 1, wherein based on existing feeder terminals, three-phase current (i an 、i bn 、i cn ) Zero sequence current (i On ) Switching coil current (i) n ) Waveform data and a buffer for current waveform feature extraction.
3. The method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process according to claim 2, characterized in that at t 0 ～t 1 In the early stage, the electromagnetic attraction force born by the iron core is smaller than the reaction force of the return spring and the self weight, the iron core does not move, the current increases exponentially, and the starting moment of the coil is judged and confirmed through the current abrupt change difference value of the coil current at the current sampling moment, delta i n ＝|i n -i n+1 |-|i n -i n-1 I, in which Δi n I is the current abrupt change difference value of the coil at the current sampling moment n For the current sampling value at the current nth interval, when delta i n ＞α t0 At this time, the coil start time t is confirmed 0 ，α t0 To activate the threshold.
4. The method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process according to claim 2, characterized in that at t 0 ～t 1 Later in the phase, when the electromagnetic attraction force is greater than the reaction force, the iron core starts to move, and the movement generates counter electromotive force which increases with the increase of the movement speed of the iron core but does not take precedence, the coil current continues to increaseUntil the voltage reaches equilibrium, the current stops growing
Beta in n I is the characteristic parameter of the current direction of the coil at the current sampling moment n For the current sampling value at the current nth interval, when beta n When the current is more than 0, the balance of the coil voltage is confirmed, and the current stops increasing at a moment t 1 。
5. The method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process according to claim 2, wherein t 1 ～t 2 In the early stages, the core speed continues to increase, the back emf dominates, and the coil current begins to drop locally.
6. The method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process according to claim 1 or 2, characterized in that t 1 ～t 2 At the later stage, the iron core touches the trip bar, at the moment, the breaker switch starts to act, the iron core receives the elastic force of the return spring and the reaction force of the trip bar, the movement speed is reduced until the iron core moves to the maximum stroke, the iron core is kept at the position, and the current stops descending.
7. The method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process according to claim 6,confirming the current stop falling time t according to the current direction characteristic parameter 2 。
8. The method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process according to claim 1 or 2, characterized in that t 2 ～t 3 At this time, the coil inductance is changed into a constant, and the coil current rises to a steady-state value exponentiallyThe steady state value is determined by the supply voltage and the internal resistance of the coil, at t' 2 When the circuit breaker is switched on and off once, the circuit is cut off by the switching action, the current value of each phase is reset to zero, and f (t 'is satisfied' 2 ) It is required that the first and second heat exchangers,zero drift threshold value collected during line cutting>t 3 And the auxiliary contact of the circuit breaker is disconnected at the moment, and the switching-on/off coil control loop is cut off.
9. The method for monitoring mechanical characteristics of a circuit breaker based on current characteristics of a breaking process according to claim 1 or 2, characterized in that it further comprises:
when the factory test is carried out, firstly, N times of breaker opening operation tests are carried out under the condition of no load current, and the characteristic time average value delta t under the condition of no current is extracted 1(0) And record and save
The circuit breaker performs Δt for the rated current, the 2-time rated current, and the load current of N-time rated current, respectively 1(1) 、Δt 1(2) 、...Δt 1(N) Extracting characteristics, carrying out correction analysis on the characteristics and the no-current condition, and obtaining the influence coefficient of the load current of the breaker on the switch action time through a self-adaptive algorithmWherein->Use coefficient->For practical applicationAnd correcting the load current action time in the process, reducing the influence of the load current, and obtaining the corrected breaker action time delta t to monitor the mechanical property performance of the breaker.
10. A breaker mechanical characteristic monitoring device based on breaking process current characteristics is characterized in that:
comprising at least one processor and a memory connected by a data bus, said memory storing instructions to be executed by said at least one processor, said instructions, after being executed by said processor, for performing the method for monitoring mechanical characteristics of a circuit breaker based on the current characteristics of a breaking process according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310566543.9A CN117665551A (en) | 2023-05-18 | 2023-05-18 | Breaker mechanical characteristic monitoring method and device based on current characteristics in opening process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310566543.9A CN117665551A (en) | 2023-05-18 | 2023-05-18 | Breaker mechanical characteristic monitoring method and device based on current characteristics in opening process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117665551A true CN117665551A (en) | 2024-03-08 |
Family
ID=90085164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310566543.9A Pending CN117665551A (en) | 2023-05-18 | 2023-05-18 | Breaker mechanical characteristic monitoring method and device based on current characteristics in opening process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117665551A (en) |
-
2023
- 2023-05-18 CN CN202310566543.9A patent/CN117665551A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102931023B (en) | Realization of control method and device for vacuum circuit breaker based on coil current | |
| JP5658524B2 (en) | Circuit breaker phase control switching system | |
| CN101640406B (en) | Arc flash detection system, apparatus and method | |
| US9703309B2 (en) | Method and apparatus for distributed overriding automatic reclosing of fault interrupting devices | |
| JP4413270B1 (en) | Switch batch monitoring device, switch batch monitoring method, program | |
| CN100530877C (en) | Novel fault protection process for intelligent circuit breakers | |
| CN203054194U (en) | Monitoring system for breaking coil and closing coil of breaker | |
| CN103487748A (en) | Method for calculating switching-off and switching-on time of breaker and stroke of moving contact of breaker | |
| CN106531480A (en) | Online monitoring method for contact of vacuum circuit breaker | |
| CN104052021A (en) | Control Circuit For Electric Power Circuit Switch | |
| CN101325327B (en) | Intelligent load-limiting breaker with auto-reclosing | |
| CN105305458B (en) | A kind of synchronous switch operating passing zero self-correction system and method | |
| CN117665551A (en) | Breaker mechanical characteristic monitoring method and device based on current characteristics in opening process | |
| CN113589156B (en) | Circuit breaker anti-tripping function test method | |
| EP2707889B1 (en) | Automatic acquisition of circuit breaker operating times for controlled switching | |
| US20120113557A1 (en) | Electronic circuit breaker | |
| CN111933460B (en) | Online evaluation method and system for failure of circuit breaker contact | |
| CN206524623U (en) | Power distribution protection system, controller switching equipment and distribution system | |
| Rusek et al. | Timings of high voltage circuit-breaker | |
| CN111900007A (en) | Method for accurately controlling phase selection closing angle | |
| CN108448552B (en) | ZLB current limiting device based on current judgment | |
| CN113421802B (en) | Low-voltage intelligent circuit breaker protection method and system | |
| CN210956573U (en) | On-line monitoring device and circuit breaker system | |
| CN116914683A (en) | Electronic circuit power control and protection method | |
| CN101615782B (en) | Method for protecting MCR of circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |