CN114779069B - Method and system for checking breaker short-circuit current direct-current component breaking capacity - Google Patents
Method and system for checking breaker short-circuit current direct-current component breaking capacity Download PDFInfo
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- CN114779069B CN114779069B CN202210701910.7A CN202210701910A CN114779069B CN 114779069 B CN114779069 B CN 114779069B CN 202210701910 A CN202210701910 A CN 202210701910A CN 114779069 B CN114779069 B CN 114779069B
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Abstract
The invention discloses a method and a system for checking the breaking capacity of a short-circuit current direct-current component of a breaker, wherein the method comprises the following steps: acquiring a short-circuit current periodic component, and judging whether the short-circuit current periodic component is greater than the rated short-circuit on-off current of the circuit breaker or not; if the periodic component of the short-circuit current is not greater than the rated short-circuit on-off current of the breaker, calculating a short-circuit current direct-current time constant; judging whether the short-circuit current direct-current time constant is within a preset time constant interval or not; if the short-circuit current direct-current time constant is not within the preset time constant interval, calculating the peak value of the first large half wave after the movable contact and the fixed contact are separated and the duration of the first large half wave after the movable contact and the fixed contact are separated; and determining whether the breaker has the breaking capacity according to whether the product of the peak value and the duration is greater than a preset threshold value. The applicability of the analysis of the on-off performance of the circuit breaker in operation can be improved, and the accuracy of the parameter selection of the newly added circuit breaker is improved.
Description
Technical Field
The invention belongs to the technical field of analysis of the on-off performance of a high-voltage circuit breaker, and particularly relates to a method and a system for checking the on-off capacity of a short-circuit current direct-current component of a circuit breaker.
Background
High voltage circuit breakers are the most critical high voltage switchgear in electrical power systems. In recent years, with the construction of extra-high voltage and new energy power grids, the problem of influence of direct current components on the on-off of a breaker when a system is in a short circuit is more prominent. At present, the circuit breaker mainly tests the breaking performance of the circuit breaker under a direct-current component through a type test, but the corresponding test requirements cannot be met for the in-transit equipment. Meanwhile, the test period is long, the influence of the direct current component is required to be evaluated within a limited time after the structure of the power grid is changed, and the on-off performance of the circuit breaker is analyzed.
CN112528586A provides an evaluation method, medium and system for the breaking performance of a high-voltage circuit breaker. And establishing a simplified enthalpy flow model of the on-off asymmetric short-circuit current of the high-voltage circuit breaker according to the relevant parameters of the high-voltage circuit breaker, simulating the asymmetric short-circuit current, and obtaining a curve of the change of the arc current and the arc voltage of the current zero region along with time. Gradually reducing the simulated asymmetric short-circuit current to obtain a short-circuit current critical value; if the current waveform is kept to be zero all the time after the zero crossing point, the current waveform can be switched on and off; if the waveform is kept as a sine wave, the switch cannot be switched on;
CN111610439A provides a method for evaluating short-circuit breaking capability and controlling phase selection breaking of a high-voltage circuit breaker. Acquiring short-circuit current and a direct current time constant of a node by adopting an electromagnetic transient calculation method; judging whether the short-circuit current is smaller than the rated short-circuit current or not, and judging whether the direct-current time constant is smaller than the rated direct-current time constant corresponding to the node or not; and if the energy is larger than the rated direct current time constant, checking through the last half-wave energy equivalent principle. The CN111579975A and the CN111610439A have the same principle, and the difference is that the short-circuit current is lacked and compared with the rated short-circuit current, but a calculation formula of the final half-wave energy equivalent principle is given;
CN107085182A provides a method for checking the short-circuit resistance of a high-voltage circuit breaker. Obtaining rated short-circuit current and a direct-current time constant of the circuit breaker, and calculating the attenuation time constant of the direct-current component of the short-circuit current by an exponential fitting method; comparing whether the attenuation time constant of the short-circuit current direct-current component exceeds the standard or not; if the short-circuit current exceeds 90% of the rated short-circuit current of the circuit breaker, judging that the circuit breaker cannot be switched off;
CN106772025A provides a breaker on-off capability evaluation method based on the full current equivalent principle, obtaining rated short circuit current and a direct current time constant of the breaker, substituting into a full current effective value expression, converting the actual on-off current of the breaker, and judging that the breaker can be turned on or off if the converted current is larger than the system short circuit current;
in summary, in some existing methods for analyzing the breaking capacity of the short-circuit current of the circuit breaker, the criterion mainly focuses on that the obtained time constant of the short-circuit current is smaller than the rated direct-current time constant of the circuit breaker, and if the obtained time constant of the short-circuit current is larger than the rated direct-current time constant of the circuit breaker, the conversion evaluation is performed according to an energy equivalence principle or a full-current equivalence principle. According to the method, the breaker short-circuit current breaking capacities are different under different direct-current time constants, the short-circuit current breaking capacity of the breaker is considered to be in one-to-one correspondence with the time constants, when the actual breaking of the breaker is not considered, the breaker can still be broken within a certain allowable deviation range, and the short-circuit current breaking capacity of the breaker is not in one-to-one correspondence with the time constants. In addition, the method only considers the magnitude of the short-circuit current and the constant between direct currents, and does not consider that the on-off performance of different circuit breaker products is different, and the on-off capacity is related to the circuit breaker.
Disclosure of Invention
The invention provides a method and a system for checking the breaking capacity of a direct current component of a short circuit current of a breaker, which are used for solving at least one technical problem.
In a first aspect, the present invention provides a method for checking the breaking capability of a short-circuit current dc component of a circuit breaker, including: acquiring a short-circuit current periodic component, and judging whether the short-circuit current periodic component is larger than the rated short-circuit on-off current of the circuit breaker or not; if the short-circuit current periodic component is not larger than the rated short-circuit on-off current of the circuit breaker, calculating a short-circuit current direct-current time constant; judging whether the short-circuit current direct-current time constant is within a preset time constant interval, wherein the preset time constant interval is an interval formed by a first short-circuit current direct-current time constant and a second short-circuit current direct-current time constant, a first deviation between a per unit value of the amplitude of the last large half wave before arc extinction of the circuit breaker corresponding to the first short-circuit current direct-current time constant and a per unit value of the amplitude of the last large half wave before arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant is within a first tolerance range, and a second deviation between the duration of the last large half wave before arc extinction of the circuit breaker corresponding to the first short-circuit current direct-current time constant and the duration of the last large half wave before arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant is within a second tolerance range; if the short-circuit current direct-current time constant is not within the preset time constant interval, calculating the peak value of the first large half-wave after the separation of the movable contact and the fixed contact and the duration time of the first large half-wave after the separation of the movable contact and the fixed contact; and determining whether the breaker has the breaking capacity according to whether the product of the peak value of the first large half-wave after the separation of the movable contact and the fixed contact and the duration of the first large half-wave after the separation of the movable contact and the fixed contact is larger than a preset threshold value.
In a second aspect, the present invention provides a system for checking the breaking capability of a short-circuit current dc component of a circuit breaker, comprising: the circuit breaker short-circuit on-off detection device comprises a first judgment module, a second judgment module and a detection module, wherein the first judgment module is configured to acquire a short-circuit current periodic component and judge whether the short-circuit current periodic component is larger than the rated short-circuit on-off current of the circuit breaker or not; the first calculation module is configured to calculate a short-circuit current direct-current time constant if the short-circuit current periodic component is not larger than the rated short-circuit on-off current of the breaker; a second determining module, configured to determine whether the short-circuit current dc time constant is within a preset time constant interval, where the preset time constant interval is an interval formed by a first short-circuit current dc time constant and a second short-circuit current dc time constant, a first deviation of a magnitude per unit value of a last large half-wave before arc quenching of the breaker corresponding to the first short-circuit current dc time constant and a first deviation of a magnitude per unit value of a last large half-wave before arc quenching of the breaker corresponding to the second short-circuit current dc time constant are within a first tolerance range, and a second deviation of a duration of the last large half-wave before arc quenching corresponding to the first short-circuit current dc time constant and a duration of the last large half-wave before arc quenching of the breaker corresponding to the second short-circuit current dc time constant are within a second tolerance range; the second calculation module is configured to calculate the peak value of the first large half wave after the movable contact and the fixed contact are separated and the duration of the first large half wave after the movable contact and the fixed contact are separated if the short-circuit current direct current time constant is not within a preset time constant interval; and the analysis module is configured to determine whether the breaker has the breaking capacity according to whether the product of the peak value of the first large half-wave after the separation of the movable contact and the fixed contact and the duration of the first large half-wave after the separation of the movable contact and the fixed contact is larger than a preset threshold value.
In a third aspect, an electronic device is provided, which includes: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method of checking the breaking capability of the short circuit dc component of the circuit breaker according to any of the embodiments of the present invention.
In a fourth aspect, the present invention further provides a computer readable storage medium, on which a computer program is stored, and when executed by a processor, the program instructions cause the processor to execute the steps of the method for checking the opening capability of the short-circuit direct-current component of the breaker according to any embodiment of the present invention.
The method and the system for checking the breaker short-circuit current direct-current component breaking capacity avoid evaluation by a simple formula conversion method, are beneficial to breaker breaking performance analysis, can improve the applicability of breaker breaking performance analysis in operation, and improve the accuracy of parameter selection of a newly-added breaker.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for checking the breaking capability of a short-circuit current dc component of a circuit breaker according to an embodiment of the present invention;
fig. 2 is a block diagram of a system for checking the breaking capability of the short-circuit current dc component of the circuit breaker according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of a method for checking the breaking capability of a short-circuit current dc component of a circuit breaker according to the present application is shown.
As shown in fig. 1, in step S101, a short-circuit current periodic component is obtained, and it is determined whether the short-circuit current periodic component is greater than a rated short-circuit breaking current of the circuit breaker;
in step S102, if the short-circuit current periodic component is not greater than the rated short-circuit on-off current of the circuit breaker, calculating a short-circuit current dc time constant;
in step S103, determining whether the short-circuit current dc time constant is within a preset time constant interval, where the preset time constant interval is an interval formed by a first short-circuit current dc time constant and a second short-circuit current dc time constant, a first deviation between a per unit value of an amplitude of a last large half-wave before arc extinction of the circuit breaker corresponding to the first short-circuit current dc time constant and a per unit value of an amplitude of a last large half-wave before arc extinction of the circuit breaker corresponding to the second short-circuit current dc time constant is within a first tolerance range, and a second deviation between a duration of the last large half-wave before arc extinction of the circuit breaker corresponding to the first short-circuit current dc time constant and a duration of the last large half-wave before arc extinction of the circuit breaker corresponding to the second short-circuit current dc time constant is within a second tolerance range;
in step S104, if the short-circuit current dc time constant is not within the preset time constant interval, calculating a peak value of a first large half-wave after the movable and stationary contacts are separated and a duration of the first large half-wave after the movable and stationary contacts are separated;
in step S105, it is determined whether the circuit breaker has a breaking capability according to whether a product of a peak value of the first large half-wave after the movable and stationary contacts are separated and a duration of the first large half-wave after the movable and stationary contacts are separated is greater than a preset threshold.
In the embodiment, a short-circuit current period component, a short-circuit current direct-current time constant, and a peak value and a duration of a first large half-wave after separation of moving and static contacts of the circuit breaker are obtained through calculation, when the short-circuit current period component is not larger than rated short-circuit on-off current of the circuit breaker, the short-circuit current direct-current time constant is classified, if the short-circuit current direct-current time constant is not within a preset time constant interval, the peak value of the first large half-wave after separation of the moving and static contacts and the duration of the first large half-wave after separation of the moving and static contacts are calculated, and whether the circuit breaker has on-off capability or not is determined according to whether the product of the peak value and the duration is larger than a preset threshold or not.
Note that the short-circuit current dc time constant is 45ms, 60ms, 75ms, 100ms, or 120ms. With one of the DC time constants
As reference time constant, respectively converting other short-circuit current into DC time constant
Calculating the amplitude per unit value and the duration of the corresponding last large half-wave before arc quenching of the circuit breaker, and calculating the deviation of the amplitude per unit value and the duration of the last large half-wave before arc quenching of the circuit breaker corresponding to the reference time constant, wherein the amplitude per unit value and the duration of the last large half-wave before arc quenching of the circuit breaker are simultaneously within the tolerance range, and the two time constants form an interval
. The amplitude per unit value and duration deviation calculation method is as follows:
in the formula (I), the compound is shown in the specification,
a first deviation between the per unit value of the amplitude of the last large half-wave before arc quenching corresponding to the first short-circuit current direct-current time constant and the per unit value of the amplitude of the last large half-wave before arc quenching corresponding to the second short-circuit current direct-current time constant,
is the amplitude per unit value of the last large half-wave before the arc extinction of the breaker corresponding to the first short-circuit current direct-current time constant,
the amplitude per unit value of the last large half-wave before arc quenching of the breaker corresponding to the second short-circuit current direct-current time constant is obtained;
in the formula (I), the compound is shown in the specification,
a second deviation between the duration of the last large half-wave before the arc-out of the circuit breaker corresponding to the first short-circuit current dc time constant and the duration of the last large half-wave before the arc-out of the circuit breaker corresponding to the second short-circuit current dc time constant,
the duration of the last large half-wave before the arc-quenching of the circuit breaker corresponding to the first short-circuit current dc time constant,
and the duration of the last large half-wave before the arc extinction of the breaker corresponding to the second short-circuit current direct-current time constant.
In conclusion, the method avoids analyzing the on-off capacity of the breaker by a simple formula conversion method, and is beneficial to analyzing the on-off performance of the breaker; the applicability of the analysis of the on-off performance of the circuit breaker in operation can be improved, and the accuracy of the parameter selection of the newly added circuit breaker is improved.
To facilitate understanding, the invention is further described by way of example:
rated short circuit breaking current of circuit breaker
The asymmetric breaking test is completed under the direct current time constant of 45ms, and the final large half-wave amplitude value of the test
Duration of time
. Calculating short circuit current period component at breaker
Short circuit current DC time constant
Calculating the peak value of the first large half-wave after the separation of the moving contact and the fixed contact of the circuit breaker
Duration of time
。
And (3) interval classification: short-circuit current direct current time constants are 45ms, 60ms, 75ms, 100ms and 120ms. The circuit breaker completes the asymmetric breaking test under the short-circuit current direct-current time constant of 45ms,
and the amplitude per unit value of the last large half-wave before the corresponding breaker is extinguished is 1.33, and the duration is 12ms. Comparing other time constants
The amplitude per unit value and the duration of the last large half-wave before the corresponding circuit breaker is put out of arc are 1.44 under the short-circuit current direct-current time constant of 60ms, and the duration is 13ms; under the short-circuit current direct-current time constant of 75ms, the amplitude per unit value of the last large half-wave before the arc extinction of the corresponding breaker is 1.51, and the duration time is 13.5ms; respectively calculating the difference between the amplitude per unit value and the duration of the last large half-wave before arc quenching of the breaker corresponding to the short-circuit current direct-current time constant of 60ms and the short-circuit current direct-current time constant of 75ms and the short-circuit current direct-current time constant of 45ms, wherein the difference between the amplitude per unit value and the duration of the last large half-wave before arc quenching of the breaker corresponding to the short-circuit current direct-current time constant of 60ms is 8.3%, and the difference between the durations is 8.3%; the amplitude per unit value deviation of the last large half-wave before the breaker is extinguished corresponding to the short-circuit current direct-current time constant of 75ms is 13.5%, and the duration deviation is 12.5%. The allowable deviation does not exceed 10%. Thus, the device
，
、
Is formed in the interval
。
And (3) evaluating the breaking capacity:
，
，
＜
the circuit breaker can be opened.
Referring to fig. 2, a block diagram of a system for checking the breaking capability of the short-circuit current dc component of the breaker according to the present application is shown.
As shown in fig. 2, the system 200 for checking the breaking capability of the short-circuit direct-current component of the breaker includes a first determining module 210, a first calculating module 220, a second determining module 230, a second calculating module 240, and an analyzing module 250.
The first judging module 210 is configured to obtain a short-circuit current periodic component, and judge whether the short-circuit current periodic component is greater than a rated short-circuit on-off current of the circuit breaker; the first calculation module 220 is configured to calculate a short-circuit current direct-current time constant if the short-circuit current periodic component is not greater than the rated short-circuit breaking current of the circuit breaker; a second determining module 230 configured to determine whether the short-circuit current dc time constant is within a preset time constant interval, where the preset time constant interval is an interval formed by a first short-circuit current dc time constant and a second short-circuit current dc time constant, a first deviation of a per unit value of an amplitude of a last large half-wave before arc quenching of the breaker corresponding to the first short-circuit current dc time constant and a per unit value of an amplitude of a last large half-wave before arc quenching of the breaker corresponding to the second short-circuit current dc time constant is within a first tolerance range, and a second deviation of a duration of the last large half-wave before arc quenching of the breaker corresponding to the first short-circuit current dc time constant and a duration of the last large half-wave before arc quenching of the breaker corresponding to the second short-circuit current dc time constant is within a second tolerance range; the second calculating module 240 is configured to calculate a peak value of the first large half-wave after the movable contact and the fixed contact are separated and a duration of the first large half-wave after the movable contact and the fixed contact are separated if the short-circuit current direct-current time constant is not within a preset time constant interval; the analysis module 250 is configured to determine whether the circuit breaker has a breaking capability according to whether a product of a peak value of the first large half-wave after the separation of the movable contact and the fixed contact and a duration of the first large half-wave after the separation of the movable contact and the fixed contact is greater than a preset threshold.
It should be understood that the modules recited in fig. 2 correspond to various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in fig. 2, and are not described again here.
In still other embodiments, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the program instructions, when executed by a processor, cause the processor to execute a method for checking the opening capability of the short-circuit direct-current component of the breaker in any of the above method embodiments;
as one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions configured to:
acquiring a short-circuit current periodic component, and judging whether the short-circuit current periodic component is larger than the rated short-circuit on-off current of the circuit breaker or not;
if the short-circuit current periodic component is not larger than the rated short-circuit on-off current of the breaker, calculating a short-circuit current direct-current time constant;
judging whether the short-circuit current direct-current time constant is within a preset time constant interval, wherein the preset time constant interval is an interval formed by a first short-circuit current direct-current time constant and a second short-circuit current direct-current time constant, a first deviation between a per unit value of the amplitude of the last large half wave before arc extinction of the circuit breaker corresponding to the first short-circuit current direct-current time constant and a per unit value of the amplitude of the last large half wave before arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant is within a first tolerance range, and a second deviation between the duration of the last large half wave before arc extinction of the circuit breaker corresponding to the first short-circuit current direct-current time constant and the duration of the last large half wave before arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant is within a second tolerance range;
if the short-circuit current direct-current time constant is not within the preset time constant interval, calculating the peak value of the first large half-wave after the separation of the movable contact and the fixed contact and the duration time of the first large half-wave after the separation of the movable contact and the fixed contact;
and determining whether the breaker has the breaking capacity according to whether the product of the peak value of the first large half wave after the movable contact and the fixed contact are separated and the duration of the first large half wave after the movable contact and the fixed contact are separated is greater than a preset threshold value.
The computer-readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created from use of a system that checks the breaking capability of the short-circuit direct-current component of the breaker, and the like. Further, the computer readable storage medium may include high speed random access memory and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the computer readable storage medium optionally includes memory remotely located from the processor, and these remote memories may be connected over a network to a system that checks the breaking capability of the short circuit dc component of the circuit breaker. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 3, the electronic device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330, and the output device 340 may be connected by a bus or other means, such as the bus connection in fig. 3. The memory 320 is the computer-readable storage medium described above. The processor 310 executes various functional applications and data processing of the server by running the nonvolatile software programs, instructions and modules stored in the memory 320, namely, the method for checking the breaking capability of the short-circuit current direct-current component of the breaker according to the above-mentioned method embodiment is realized. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function controls of the system that checks the breaking capability of the short circuit dc component of the circuit breaker. The output device 340 may include a display device such as a display screen.
The electronic equipment can execute the method provided by the embodiment of the invention and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided in the embodiment of the present invention.
As an embodiment, the electronic device is applied to a system for checking the breaking capability of a short-circuit current direct-current component of a breaker, and is used for a client, and the system comprises: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to:
acquiring a short-circuit current periodic component, and judging whether the short-circuit current periodic component is larger than the rated short-circuit on-off current of the circuit breaker or not;
if the short-circuit current periodic component is not larger than the rated short-circuit on-off current of the breaker, calculating a short-circuit current direct-current time constant;
judging whether the short-circuit current direct-current time constant is within a preset time constant interval, wherein the preset time constant interval is an interval formed by a first short-circuit current direct-current time constant and a second short-circuit current direct-current time constant, a first deviation between a per unit value of the amplitude of the last large half wave before arc extinction of the circuit breaker corresponding to the first short-circuit current direct-current time constant and a per unit value of the amplitude of the last large half wave before arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant is within a first tolerance range, and a second deviation between the duration of the last large half wave before arc extinction of the circuit breaker corresponding to the first short-circuit current direct-current time constant and the duration of the last large half wave before arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant is within a second tolerance range;
if the short-circuit current direct-current time constant is not within the preset time constant interval, calculating the peak value of the first large half-wave after the separation of the movable contact and the fixed contact and the duration time of the first large half-wave after the separation of the movable contact and the fixed contact;
and determining whether the breaker has the breaking capacity according to whether the product of the peak value of the first large half-wave after the separation of the movable contact and the fixed contact and the duration of the first large half-wave after the separation of the movable contact and the fixed contact is larger than a preset threshold value.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of various embodiments or some parts of embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for checking the breaking capacity of a direct current component of a short circuit current of a circuit breaker is characterized by comprising the following steps:
acquiring a short-circuit current periodic component, and judging whether the short-circuit current periodic component is larger than the rated short-circuit on-off current of the circuit breaker or not;
if the short-circuit current periodic component is not larger than the rated short-circuit on-off current of the circuit breaker, calculating a short-circuit current direct-current time constant;
judging whether the short-circuit current direct-current time constant is in a preset time constant interval, wherein the preset time constant interval is an interval formed by a first short-circuit current direct-current time constant and a second short-circuit current direct-current time constant, a first deviation between a magnitude per unit value of the last large half-wave before arc quenching of the breaker corresponding to the first short-circuit current direct-current time constant and a magnitude per unit value of the last large half-wave before arc quenching of the breaker corresponding to the second short-circuit current direct-current time constant is within a first tolerance range, and a second deviation between the duration of the last large half-wave before arc quenching of the breaker corresponding to the first short-circuit current direct-current time constant and the duration of the last large half-wave before arc quenching of the breaker corresponding to the second short-circuit current direct-current time constant is within a second tolerance range;
if the short-circuit current direct-current time constant is not within the preset time constant interval, calculating the peak value of the first large half-wave after the separation of the movable contact and the fixed contact and the duration time of the first large half-wave after the separation of the movable contact and the fixed contact;
and determining whether the breaker has the breaking capacity according to whether the product of the peak value of the first large half wave after the movable contact and the fixed contact are separated and the duration of the first large half wave after the movable contact and the fixed contact are separated is greater than a preset threshold value.
2. The method for checking the breaking capability of the short-circuit current direct-current component of the breaker according to claim 1, wherein after determining whether the short-circuit current periodic component is larger than the rated short-circuit breaking current of the breaker, the method comprises:
and if the short-circuit current periodic component is larger than the rated short-circuit on-off current of the breaker, the breaker does not have the on-off capability.
3. The method according to claim 1, wherein an expression for calculating a first deviation between the per unit value of the amplitude of the last large half-wave before arc-quenching corresponding to the first short-circuit current dc time constant and the per unit value of the amplitude of the last large half-wave before arc-quenching corresponding to the second short-circuit current dc time constant is:
in the formula (I), the compound is shown in the specification,
is a first deviation between the amplitude per unit value of the last large half-wave before the arc-quenching of the breaker corresponding to the first short-circuit current direct-current time constant and the amplitude per unit value of the last large half-wave before the arc-quenching of the breaker corresponding to the second short-circuit current direct-current time constant,
is the amplitude per unit value of the last large half-wave before the arc extinction of the breaker corresponding to the first short-circuit current direct-current time constant,
and the amplitude per unit value of the last large half-wave before the arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant.
4. The method for checking the on-off capability of the short-circuit direct-current component of the breaker according to claim 1, wherein an expression for calculating a second deviation between the duration of the last large half-wave before the arc-quenching of the breaker corresponding to the first short-circuit direct-current time constant and the duration of the last large half-wave before the arc-quenching of the breaker corresponding to the second short-circuit direct-current time constant is as follows:
in the formula (I), the compound is shown in the specification,
the duration of the last large half-wave before the arc-extinguishing of the breaker corresponding to the first short-circuit current direct-current time constant and the duration of the last large half-wave before the arc-extinguishing of the breaker corresponding to the second short-circuit current direct-current time constant are determinedIs measured with respect to the first deviation of (1),
the duration of the last large half-wave before the arc-quenching of the circuit breaker corresponding to the first short-circuit current dc time constant,
and the duration of the last large half-wave before the arc extinction of the breaker corresponding to the second short-circuit current direct-current time constant.
5. The method for checking the breaking capability of the short-circuit direct current component of the circuit breaker according to claim 1, wherein the determining whether the circuit breaker has the breaking capability according to whether a product of a peak value of a first large half-wave after the separation of the movable contact and a duration of the first large half-wave after the separation of the movable contact and the fixed contact is greater than a preset threshold value comprises:
if the product of the peak value of the first large half wave after the movable contact and the fixed contact are separated and the duration of the first large half wave after the movable contact and the fixed contact are separated is larger than a preset threshold value, the breaker does not have the breaking capacity;
and if the product of the peak value of the first large half wave after the movable contact and the fixed contact are separated and the duration of the first large half wave after the movable contact and the fixed contact are separated is not more than a preset threshold, the breaker has the breaking capacity.
6. A system for verifying the breaking capability of a dc component of a short circuit current of a circuit breaker, comprising:
the circuit breaker short-circuit on-off detection device comprises a first judgment module, a second judgment module and a detection module, wherein the first judgment module is configured to obtain a short-circuit current periodic component and judge whether the short-circuit current periodic component is larger than the rated short-circuit on-off current of the circuit breaker;
the first calculation module is configured to calculate a short-circuit current direct-current time constant if the short-circuit current periodic component is not larger than the rated short-circuit on-off current of the breaker;
a second judging module, configured to judge whether the short-circuit current direct-current time constant is within a preset time constant interval, where the preset time constant interval is an interval formed by a first short-circuit current direct-current time constant and a second short-circuit current direct-current time constant, a first deviation between a per unit value of an amplitude of a last large half-wave before arc extinction of the circuit breaker corresponding to the first short-circuit current direct-current time constant and a per unit value of an amplitude of a last large half-wave before arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant is within a first tolerance range, and a second deviation between a duration of the last large half-wave before arc extinction of the circuit breaker corresponding to the first short-circuit current direct-current time constant and a duration of the last large half-wave before arc extinction of the circuit breaker corresponding to the second short-circuit current direct-current time constant is within a second tolerance range;
the second calculation module is configured to calculate the peak value of the first large half-wave after the movable contact and the fixed contact are separated and the duration of the first large half-wave after the movable contact and the fixed contact are separated if the short-circuit current direct-current time constant is not within a preset time constant interval;
and the analysis module is configured to determine whether the breaker has the breaking capacity according to whether the product of the peak value of the first large half-wave after the separation of the movable contact and the fixed contact and the duration of the first large half-wave after the separation of the movable contact and the fixed contact is larger than a preset threshold value.
7. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any of claims 1 to 5.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1 to 5.
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