Circuit breaker failure discrimination method, electronic device, and computer-readable storage medium

Abstract

The application relates to the technical field of power system relay protection, in particular to a circuit breaker failure discrimination method, an electronic device and a computer readable storage medium. The method comprises the following steps: acquiring multiple groups of current sequences, the multiple groups of current sequences corresponding to multiple-phase lines in a one-to-one manner, a first group of current sequences comprising multiple first-phase currents, the multiple first-phase currents being multiple continuous phase currents collected by a protection device in a first preset time period according to a preset sampling frequency; determining multiple current fundamental wave amplitudes corresponding to the multiple groups of current sequences, the multiple current fundamental wave amplitudes corresponding to the multiple groups of current sequences in a one-to-one manner; determining a zero sequence current according to multiple second-phase currents, the multiple second-phase currents being multiple phase currents collected by the protection device at a current moment; and if the zero sequence current is greater than or equal to a preset zero sequence current threshold and the multiple current fundamental wave amplitudes satisfy a first preset condition, determining that the protection device is in a circuit breaker failure state. The application can improve the accuracy and reliability of circuit breaker failure discrimination.

Description

Technical Field

[0001] This application relates to the field of power system relay protection technology, and in particular to a circuit breaker failure detection method, electronic equipment, and computer-readable storage medium. Background Technology

[0002] In power systems, protection devices are used to monitor line faults. When a short-circuit fault occurs in primary equipment (such as transmission lines, transformers, busbars, or other equipment), the protection device, upon detecting the anomaly, sends a trip command to the circuit breaker of the faulty phase, instructing the corresponding circuit breaker to interrupt the fault current. If the circuit breaker fails to perform the tripping action, it is called circuit breaker failure (also known as circuit breaker malfunction).

[0003] In traditional technical solutions, when a protection device determines whether a circuit breaker has failed, it typically does so by analyzing the current flowing through the circuit breaker. Specifically, if, after the line protection device issues a trip command, the current flowing through the circuit breaker corresponding to the faulty phase exceeds a preset failure threshold and the duration exceeds a preset time threshold, the line protection device determines that the circuit breaker corresponding to the faulty phase has failed.

[0004] However, if the current flowing through the circuit breaker is small and the preset failure setting is large, the line protection device cannot accurately identify a circuit breaker failure. If the preset failure setting is small, the line protection device may misjudge a circuit breaker that has not failed as a failure. Traditional circuit breaker failure detection carries the risk of non-operation or false operation. Summary of the Invention

[0005] This application provides a circuit breaker failure detection method, electronic device, and computer-readable storage medium. It can collaboratively determine whether a circuit breaker is in a malfunctioning state by using the fundamental current amplitude of the multi-phase lines collected within a sampling period, the current zero-sequence current, and the circuit breaker position, thereby improving the accuracy and reliability of circuit breaker failure detection.

[0006] Firstly, this application provides a circuit breaker failure detection method applied to a protection device. The method includes: acquiring multiple sets of current sequences, each set corresponding to a multi-phase line; the first set of current sequences includes multiple first-phase currents, which are multiple continuous phase currents collected by the protection device within a first preset time period according to a preset sampling frequency; the end time of the first preset time period is the current time; the start time of the first preset time period is a time interval of sampling period before the current time; the first set of current sequences is any one of the multiple sets of current sequences; and the sampling period is the reciprocal of the preset sampling frequency. The method further includes: determining multiple fundamental current amplitudes corresponding to the multiple sets of current sequences, each corresponding to a specific set of current sequences; determining a zero-sequence current based on multiple second-phase currents, where the multiple second-phase currents are multiple phase currents collected by the protection device at the current time, each corresponding to a specific multi-phase line; and determining that the protection device is in a circuit breaker failure state if the zero-sequence current is greater than or equal to a preset zero-sequence current threshold and the multiple fundamental current amplitudes meet a first preset condition.

[0007] In some implementations, prior to the step of obtaining multiple sets of current sequences, the method further includes: if only one of the first phase lines is in a short-circuit state, then sending a disconnect command to the circuit breaker corresponding to the first phase line, where the first phase line is any one of the multi-phase lines, and the disconnect command instructs the circuit breaker to change the line state to an open state. If all multi-phase lines are in a short-circuit state, then sending disconnect commands to the multiple circuit breakers corresponding to the multi-phase lines respectively.

[0008] In some implementations, if only the first phase line is in a short-circuit state, the first preset condition is that only one of the multiple current fundamental amplitude values ​​is greater than or equal to a preset fundamental amplitude value, and the first current fundamental amplitude value is a current fundamental amplitude value corresponding to the first phase line among the multiple current fundamental amplitude values. If all phase lines are in a short-circuit state, the first preset condition is that there is a second current fundamental amplitude value among the multiple current fundamental amplitude values, the second current fundamental amplitude value is greater than the preset fundamental amplitude value, and the second current fundamental amplitude value is any one of the multiple current fundamental amplitude values.

[0009] In some implementations, if only the first phase is short-circuited, the protection device is determined to be in a circuit breaker malfunction state, including: obtaining the position of the first circuit breaker corresponding to the first phase. If the first circuit breaker position is closed, the protection device is determined to be in a circuit breaker malfunction state. If all multiple phases are short-circuited, the protection device is determined to be in a circuit breaker malfunction state, including: obtaining the positions of multiple second circuit breakers corresponding to the multiple phases. If one of the multiple second circuit breaker positions is closed, the protection device is determined to be in a circuit breaker malfunction state.

[0010] In some implementations, determining that the protection device is in a circuit breaker failure state if all phases are in a short-circuit state includes: determining the negative sequence current based on multiple second-phase currents. If the negative sequence current is greater than or equal to a preset negative sequence current threshold, then the protection device is determined to be in a circuit breaker failure state.

[0011] In some implementations, after determining that the current state is a circuit breaker failure state, the method further includes: if the protection device remains in a circuit breaker failure state for a second preset time period, then perform a circuit breaker failure protection action, wherein the start time of the second preset time period is the current time, and the duration of the second preset time period is a preset duration.

[0012] In some implementations, determining multiple fundamental current amplitude values ​​corresponding to multiple current sequences includes: determining multiple fundamental current amplitude values ​​corresponding to multiple current sequences based on a full-cycle Fourier algorithm.

[0013] Secondly, this application provides a circuit breaker failure detection device, which includes an acquisition module and a processing module.

[0014] The acquisition module is used to acquire multiple sets of current sequences, which correspond one-to-one with multi-phase lines. The first set of current sequences includes multiple first-phase currents, which are multiple continuous phase currents collected by the protection device within a first preset time period according to a preset sampling frequency. The end time corresponding to the first preset time period is the current time, and the start time corresponding to the first preset time period is the time before the current time, which is the time interval of the sampling period from the current time. The first set of current sequences is any one of the multiple sets of current sequences, and the sampling period is the reciprocal of the preset sampling frequency.

[0015] The processing module is used to determine multiple fundamental current amplitude values ​​corresponding to multiple sets of current sequences, with each set of current amplitude values ​​corresponding to a specific set of current sequences.

[0016] The processing module is also used to determine the zero-sequence current based on multiple second-phase currents. The multiple second-phase currents are multiple phase currents collected by the protection device at the current moment, and the multiple second-phase currents correspond one-to-one with the multi-phase line.

[0017] The processing module is also used to determine that the protection device is in a circuit breaker failure state when the zero-sequence current is greater than or equal to a preset zero-sequence current threshold and multiple current fundamental amplitude values ​​meet the first preset condition.

[0018] Thirdly, this application provides a chip for performing the methods described in any of the first aspects above.

[0019] Fourthly, this application provides an electronic device including a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the method as described in any of the first aspects above. Alternatively,

[0020] Electronic devices include chips, as described in the third aspect.

[0021] Fifthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method as described in any of the first aspects above.

[0022] In a sixth aspect, this application provides a computer program product storing a computer program that, when executed by a processor, implements the method as described in any of the first aspects above.

[0023] In the technical solution provided in this application, the protection device can acquire multiple sets of current sequences, each corresponding to a multi-phase line. The first set of current sequences includes multiple first-phase currents, which are continuous phase currents collected by the protection device within a first preset time period according to a preset sampling frequency. The end time of the first preset time period is the current time, and the start time is the time interval between the current time and the current time, which is a sampling period. The first set of current sequences is any one of the multiple sets of current sequences, and the sampling period is the reciprocal of the preset sampling frequency. Multiple fundamental amplitude values ​​of currents corresponding to the multiple sets of current sequences are determined, each corresponding to a different set of current sequences. Then, based on multiple second-phase currents, the zero-sequence current is determined. These multiple second-phase currents are phase currents collected by the protection device at the current time, each corresponding to a different multi-phase line. If the zero-sequence current is greater than or equal to a preset zero-sequence current threshold, and the multiple fundamental amplitude values ​​meet a first preset condition, then the protection device is determined to be in a circuit breaker failure state. The technical solution provided in this application can collaboratively determine whether a circuit breaker is in a malfunctioning state by using the fundamental current amplitude of the multi-phase lines collected within a sampling period, the current zero-sequence current, and the circuit breaker position. This solves the problems of insufficient sensitivity and high false alarm rate caused by traditional technical solutions relying on a single current amplitude judgment, and is suitable for complex fault scenarios. It improves the accuracy and reliability of circuit breaker failure detection, facilitates the execution of circuit breaker failure protection, thereby reducing the scope of power outages, enhancing grid reliability, protecting critical equipment, extending the service life of critical equipment, and ultimately reducing grid operation and maintenance costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a relay protection process for a circuit breaker failure detection method provided in this application embodiment;

[0026] Figure 2 This is a schematic diagram of a circuit breaker failure detection process provided in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of a circuit breaker failure detection device provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0029] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0030] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0031] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0032] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0033] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0035] In power systems, protection devices are used to monitor line faults. When a short-circuit fault occurs in primary equipment (such as transmission lines, transformers, busbars, or other equipment) in a power system, the protection device, upon detecting the anomaly, issues a trip command to the circuit breaker of the faulty phase, instructing the corresponding circuit breaker to interrupt the fault current. If the circuit breaker fails to perform the tripping action due to mechanical failure, jamming of the operating mechanism, or abnormality in the electrical control circuit, it is called circuit breaker failure (also known as circuit breaker malfunction).

[0036] If a circuit breaker malfunctions and is not addressed in a timely manner, it can lead to serious consequences.

[0037] For example, if a transformer experiences a short circuit fault, the protection device will send a trip command to the circuit breaker of the faulty phase after detecting the abnormality. If the circuit breaker of the faulty phase fails to perform the trip action, the fault current will continue to exist, causing serious damage to the transformer or even causing a fire.

[0038] For example, if a short circuit fault occurs on a transmission line, the protection device will send a trip command to the circuit breaker of the faulty phase after detecting the abnormality. If the circuit breaker of the faulty phase fails to perform the trip action, the protection devices of other lines on the transmission line will start the protection action, resulting in power outages in non-faulty areas, expanding the scope of the accident, and causing significant economic losses.

[0039] Circuit breaker failure protection refers to the protection device that, when a circuit breaker fails, disconnects other related circuit breakers within the same power plant by identifying the failure, thus minimizing the scope of the power outage and ensuring the stable operation of the entire power grid. This avoids serious burnout of faulty components such as generators and transformers, as well as the collapse and disintegration of the power grid.

[0040] In traditional technical solutions, when a protection device determines whether a circuit breaker has failed, it typically does so by analyzing the current flowing through the circuit breaker. Specifically, if, after the line protection device issues a trip command, the current flowing through the circuit breaker corresponding to the faulty phase exceeds a preset failure threshold and the duration exceeds a preset time threshold, the line protection device determines that the circuit breaker corresponding to the faulty phase has failed.

[0041] However, if the current flowing through the circuit breaker is small and the preset failure setting is large, the line protection device cannot accurately identify a circuit breaker failure. If the preset failure setting is small, the line protection device may misjudge a circuit breaker that has not failed as a failure. Traditional circuit breaker failure detection carries the risk of non-operation or false operation.

[0042] In view of this, this application provides a circuit breaker failure detection method. This method can collaboratively determine whether a circuit breaker is in a malfunctioning state by using the fundamental current amplitude of the multi-phase lines collected within a sampling period, the current zero-sequence current, and the circuit breaker position. This solves the problems of insufficient sensitivity and high false positive rate caused by traditional technical solutions relying on single current amplitude judgment, and is suitable for complex fault scenarios. It improves the accuracy and reliability of circuit breaker failure detection, facilitates the execution of circuit breaker failure protection, thereby reducing the power outage area, improving the reliability of the power grid, protecting critical equipment, extending the service life of critical equipment, and ultimately reducing power grid operation and maintenance costs.

[0043] The technical solutions of the embodiments of this application are described below with reference to the examples in the accompanying drawings.

[0044] Figure 1 This is a schematic diagram of a relay protection process for a circuit breaker failure detection method provided in an embodiment of this application. Figure 1 As shown, before initiating the circuit breaker failure detection process, the protection device can also perform the following steps:

[0045] Step S101: Determine the line status of the multi-phase line.

[0046] The protection device can monitor the status of multi-phase lines in real time. Multi-phase lines can be three-phase lines. For example, a three-phase line can be: phase A line, phase B line, and phase C line.

[0047] The protection device can monitor the line status of multi-phase lines using any line protection method, and this application does not limit it.

[0048] Step S102: If only the first phase line is in a short circuit state, send a disconnect command to the circuit breaker corresponding to the first phase line. The first phase line is any one of the phase lines in the multi-phase line. The disconnect command is used to instruct the circuit breaker to change the line state to the disconnect state.

[0049] If the protection device detects a single-phase line fault, it sends a disconnect command to the circuit breaker corresponding to the faulty phase, instructing the circuit breaker to change the line status to open.

[0050] Step S103: If all multi-phase lines are in a short-circuit state, then send disconnection commands to the multiple circuit breakers corresponding to the multi-phase lines respectively.

[0051] If the protection device detects a three-phase line fault, it sends a disconnect command to the circuit breaker corresponding to each of the three phases, instructing the circuit breaker to change the line status to the disconnected state.

[0052] After the protection device sends a disconnect command to the circuit breaker corresponding to the faulty phase line, the protection device initiates the circuit breaker failure detection process. Figure 2 This is a schematic diagram of a circuit breaker failure detection process provided in an embodiment of this application. Figure 2 As shown, it includes the following steps:

[0053] Step S201: Obtain multiple sets of current sequences. Each set of current sequences corresponds to a multi-phase line. The first set of current sequences includes multiple first-phase currents. These multiple first-phase currents are multiple continuous phase currents collected by the protection device within a first preset time period according to a preset sampling frequency. The end time corresponding to the first preset time period is the current time. The start time corresponding to the first preset time period is the time before the current time, which is the time interval of the sampling period from the current time. The first set of current sequences is any one of the multiple sets of current sequences. The sampling period is the reciprocal of the preset sampling frequency.

[0054] In this embodiment, the protection device can collect the current corresponding to the multi-phase lines according to a preset sampling frequency, and monitor whether the circuit breaker is in a malfunctioning state by collecting the current corresponding to the multi-phase lines in real time. Specifically, the protection device can determine whether the circuit breaker is in a malfunctioning state by comparing the multiple currents corresponding to the multi-phase lines collected at the current moment with the multiple currents corresponding to the multi-phase lines collected in a sampling period before the current moment.

[0055] For example, a multiphase line can be a three-phase line, and multiple current sequences are equivalent to three current sequences. Each current sequence includes the current corresponding to the most recently acquired phase of the line by the protection device within a sampling period according to a preset sampling frequency.

[0056] For example, if a protection device can collect 24 current samples within one sampling period, and the multiphase lines are designated as phase A, phase B, and phase C, then the multiple current sequences are: the current sequence corresponding to phase A, the current sequence corresponding to phase B, and the current sequence corresponding to phase C. The current sequence corresponding to phase A includes the current sampled at the current moment and the 23 current samples collected by the protection device before the current moment. The current sequence corresponding to phase B includes the current sampled at the current moment and the 23 current samples collected by the protection device before the current moment. The current sequence corresponding to phase C includes the current sampled at the current moment and the 23 current samples collected by the protection device before the current moment.

[0057] Step S202: Determine multiple fundamental current amplitude values ​​corresponding to multiple current sequences, with each of the multiple fundamental current amplitude values ​​corresponding to one of the multiple current sequences.

[0058] In the technical solution provided in this application embodiment, the protection device can calculate multiple current fundamental amplitudes corresponding to multiple current sequences using existing current fundamental amplitude calculation methods. For example, the protection device can use a full-cycle Fourier algorithm to calculate the amplitude values ​​of multiple fundamental current waves corresponding to multiple current sequences. This application will not be elaborated upon here.

[0059] Step S203: Determine the zero-sequence current based on the multiple second-phase currents. The multiple second-phase currents are the multiple phase currents collected by the protection device at the current moment, and the multiple second-phase currents correspond one-to-one with the multi-phase line.

[0060] Zero-sequence current can be considered as the average of the multi-phase currents corresponding to the multi-phase lines collected by the protection device at the current moment. That is, zero-sequence current. Among them, I A I represents the current corresponding to phase A of the line collected at the current moment. B I represents the current corresponding to phase B of the line at the current moment. C This represents the current corresponding to the C-phase line as collected at the current moment.

[0061] Step S204: If the zero-sequence current is greater than or equal to the preset zero-sequence current threshold, and the amplitude values ​​of multiple current fundamental waves meet the first preset condition, then the protection device is determined to be in a circuit breaker failure state.

[0062] The preset zero-sequence current threshold can be used as the zero-sequence current setting for failure. In the technical solution provided in this application embodiment, if only the first phase line is in a short-circuit state, determining that the protection device is in a circuit breaker failure state can include two judgment conditions. If both judgment conditions are met simultaneously, it can be determined that the protection device is in a circuit breaker failure state.

[0063] Condition 1: Zero-sequence current is greater than or equal to the preset zero-sequence current threshold.

[0064] Condition 2: Among the multiple current fundamental amplitude values, only the first current fundamental amplitude value is greater than or equal to the preset fundamental amplitude value. The first current fundamental amplitude value is a current fundamental amplitude value corresponding to the first phase line among the multiple current fundamental amplitude values.

[0065] If all phases of the circuit are in a short circuit state, the determination that the protection device is in a circuit breaker failure state can also include two judgment conditions. If both judgment conditions are met at the same time, the protection device can be determined to be in a circuit breaker failure state.

[0066] Condition 1: Zero-sequence current is greater than or equal to the preset zero-sequence current threshold.

[0067] Condition 2: Among the multiple current fundamental amplitude values ​​corresponding to a multiphase line, at least one current fundamental amplitude value is greater than the preset fundamental amplitude value.

[0068] In the technical solution provided in this application embodiment, the protection device can acquire multiple sets of current sequences, each corresponding to a multi-phase line. The first set of current sequences includes multiple first-phase currents, which are continuous phase currents collected by the protection device within a first preset time period according to a preset sampling frequency. The end time of the first preset time period is the current time, and the start time is a time interval of sampling period before the current time. The first set of current sequences is any one of the multiple sets of current sequences, and the sampling period is the reciprocal of the preset sampling frequency. Multiple fundamental amplitude values ​​of currents corresponding to the multiple sets of current sequences are determined, each corresponding to a different set of current sequences. Then, based on multiple second-phase currents, a zero-sequence current is determined. These second-phase currents are multiple phase currents collected by the protection device at the current time, each corresponding to a different multi-phase line. If the zero-sequence current is greater than or equal to a preset zero-sequence current threshold, and the multiple fundamental amplitude values ​​meet a first preset condition, then the protection device is determined to be in a circuit breaker failure state. The technical solution provided in this application can collaboratively determine whether a circuit breaker is in a malfunctioning state by using the fundamental current amplitude of the multi-phase lines collected within a sampling period and the zero-sequence current at the current moment. This solves the problems of insufficient sensitivity and high false alarm rate caused by traditional technical solutions relying on a single current amplitude judgment, and is suitable for complex fault scenarios. It improves the accuracy and reliability of circuit breaker failure detection, facilitates the execution of circuit breaker failure protection, thereby reducing the scope of power outages, enhancing grid reliability, protecting critical equipment, extending the service life of critical equipment, and ultimately reducing grid operation and maintenance costs.

[0069] In some embodiments, the protection device can also obtain the circuit breaker positions. If only the first phase line is in a short-circuit state, the protection device obtains the position of the first circuit breaker corresponding to the first phase line. If multiple phase lines are in a short-circuit state, the protection device obtains the positions of multiple second circuit breakers corresponding to the multiple phase lines. The protection device can collaboratively determine whether the circuit breaker is in a malfunction state by combining whether the circuit breaker is in the closed position with the fundamental current amplitude and the zero-sequence current at the current moment.

[0070] Specifically, if only the first phase of the circuit is in a short circuit state, then determining that the protection device is in a circuit breaker failure state can include three judgment conditions. If all three judgment conditions are met at the same time, then it can be determined that the protection device is in a circuit breaker failure state.

[0071] Condition 1: Zero-sequence current is greater than or equal to the preset zero-sequence current threshold.

[0072] Condition 2: Among the multiple current fundamental amplitude values, only the first current fundamental amplitude value is greater than or equal to the preset fundamental amplitude value. The first current fundamental amplitude value is a current fundamental amplitude value corresponding to the first phase line among the multiple current fundamental amplitude values.

[0073] Condition 3: The first circuit breaker is in the closed position.

[0074] If all phases of the circuit are in a short circuit state, the determination that the protection device is in a circuit breaker failure state can also include three judgment conditions. If all three judgment conditions are met at the same time, the protection device can be determined to be in a circuit breaker failure state.

[0075] Condition 1: Zero-sequence current is greater than or equal to the preset zero-sequence current threshold.

[0076] Condition 2: Among the multiple current fundamental amplitude values ​​corresponding to a multiphase line, at least one current fundamental amplitude value is greater than the preset fundamental amplitude value.

[0077] Condition 3: Among the multiple second circuit breaker positions, there is a second circuit breaker position that is in the closed position.

[0078] In some embodiments, if all multi-phase lines are in a short-circuit state, the protection device can also collaboratively determine whether the circuit breaker is in a malfunction state by using the negative sequence current, combined with the circuit breaker position, the fundamental current amplitude, and the zero-sequence current at the current moment. Specifically, the protection device can determine the negative sequence current based on the multiple currents (multiple second-phase currents) corresponding to the multi-phase lines collected at the current moment. Determining whether the protection device is in a circuit breaker malfunction state can include four judgment conditions. If all four judgment conditions are met simultaneously, it can be determined that the protection device is in a circuit breaker malfunction state.

[0079] Condition 1: Zero-sequence current is greater than or equal to the preset zero-sequence current threshold.

[0080] Condition 2: Among the multiple current fundamental amplitude values ​​corresponding to a multiphase line, at least one current fundamental amplitude value is greater than the preset fundamental amplitude value.

[0081] Condition 3: Among the multiple second circuit breaker positions, there is a second circuit breaker position that is in the closed position.

[0082] Condition 4: The negative sequence current is greater than or equal to the preset negative sequence current threshold.

[0083] In the technical solution provided in this application embodiment, the preset negative sequence current threshold can be a failure negative sequence current setpoint, and the calculation formula for the negative sequence current I2 can be:

[0084] Where a represents the rotation operator, I A I represents the current corresponding to phase A of the line collected at the current moment. B I represents the current corresponding to phase B of the line at the current moment. C This represents the current corresponding to the C-phase line as collected at the current moment.

[0085] In some embodiments, after determining that the circuit breaker is in a malfunction state, the protection device may, to avoid misjudgment caused by current fluctuations or calculation errors, record the duration of the circuit breaker malfunction. That is, if the protection device remains in a malfunction state for a second preset time period, it will execute the circuit breaker malfunction protection action. The start time of the second preset time period is the current time, and the duration of the second preset time period is the preset duration.

[0086] For example, the duration of the second preset time period can be 2ms, 3ms or other durations, which are not limited in this application.

[0087] It should be understood that, provided there are no logical conflicts, the above-described embodiments can be combined and implemented to adapt to actual application needs. These combined embodiments or implementation schemes are still within the scope of protection of this application.

[0088] Corresponding to the circuit breaker failure detection method in the above embodiments, this application provides a circuit breaker failure detection device 30. This device 30 can be a first line protection device used to monitor the line status of a first line segment. The circuit breaker failure detection device 30 can be implemented as part or all of a computer device using software, hardware, or a combination of both, and is used to execute the steps in the circuit breaker failure detection method in the above embodiments.

[0089] Figure 3 A schematic diagram of a circuit breaker failure detection device provided in an embodiment of this application is shown. For ease of explanation, only the parts related to the embodiment of this application are shown.

[0090] Reference Figure 3 The circuit breaker failure detection device 30 includes an acquisition module 310 and a processing module 320.

[0091] The acquisition module 310 is used to acquire multiple sets of current sequences. Each set of current sequences corresponds to a multi-phase line. The first set of current sequences includes multiple first-phase currents. These multiple first-phase currents are multiple continuous phase currents collected by the protection device within a first preset time period according to a preset sampling frequency. The end time corresponding to the first preset time period is the current time, and the start time corresponding to the first preset time period is the time before the current time, which is separated from the current time by a sampling period. The first set of current sequences is any one of the multiple sets of current sequences, and the sampling period is the reciprocal of the preset sampling frequency.

[0092] The processing module 320 is used to determine multiple current fundamental amplitude values ​​corresponding to multiple current sequences, and the multiple current fundamental amplitude values ​​correspond one-to-one with the multiple current sequences.

[0093] The processing module 320 is also used to determine the zero-sequence current based on multiple second-phase currents. The multiple second-phase currents are multiple phase currents collected by the protection device at the current moment, and the multiple second-phase currents correspond one-to-one with the multi-phase line.

[0094] The processing module 320 is also used to determine that the protection device is in a circuit breaker failure state when the zero-sequence current is greater than or equal to a preset zero-sequence current threshold and multiple current fundamental amplitude values ​​meet the first preset condition.

[0095] In some embodiments, the processing module 320 is further configured to: send a disconnect command to the circuit breaker corresponding to the first phase line when only the first phase line is in a short-circuit state, wherein the first phase line is any one of the phase lines in the multi-phase line, and the disconnect command is used to instruct the circuit breaker to change the line state to an open state; and send disconnect commands to the multiple circuit breakers corresponding to the multi-phase lines respectively when all the phase lines are in a short-circuit state.

[0096] In some embodiments, if only one of the first phase lines is in a short-circuit state, the first preset condition is that only one of the plurality of current fundamental amplitude values ​​is greater than or equal to a preset fundamental amplitude value, and the first current fundamental amplitude value is a current fundamental amplitude value corresponding to the first phase line among the plurality of current fundamental amplitude values. If all phase lines are in a short-circuit state, the first preset condition is that there exists a second current fundamental amplitude value among the plurality of current fundamental amplitude values, the second current fundamental amplitude value is greater than the preset fundamental amplitude value, and the second current fundamental amplitude value is any one of the plurality of current fundamental amplitude values.

[0097] In some embodiments, if only the first phase line is in a short-circuit state, the processing module 320 is specifically used to: obtain the position of the first circuit breaker corresponding to the first phase line. If the first circuit breaker position is closed, it is determined that the protection device is in a circuit breaker failure state. If all phase lines are in a short-circuit state, the processing module 320 is specifically used to: obtain the positions of multiple second circuit breakers corresponding to the multiple phase lines. If one of the multiple second circuit breaker positions is in the closed position, it is determined that the protection device is in a circuit breaker failure state.

[0098] In some embodiments, if all phase lines are in a short-circuit state, the processing module 320 is specifically used to: determine the negative sequence current based on multiple second-phase currents. If the negative sequence current is greater than or equal to a preset negative sequence current threshold, it is determined that the protection device is in a circuit breaker failure state.

[0099] In some embodiments, the processing module 320 is further configured to: if the protection device remains in a circuit breaker failure state for a second preset time period, execute a circuit breaker failure protection action, wherein the start time of the second preset time period is the current time, and the duration of the second preset time period is a preset duration.

[0100] In some embodiments, the processing module 320 is specifically used to: determine multiple current fundamental amplitude values ​​corresponding to multiple sets of current sequences based on the full-cycle Fourier algorithm.

[0101] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0102] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0103] Based on the same inventive concept, embodiments of this application also provide an electronic device.

[0104] Figure 4 This is a schematic diagram of the structure of the electronic device provided in an embodiment of this application. For example... Figure 4 As shown, the electronic device 40 of this embodiment includes: at least one processor 410 ( Figure 4 Only one is shown in the diagram. The processor 410 includes a memory 420 and a communication module 440. The memory 420 stores a computer program 430 that may run on the processor 410. When the processor 410 executes the computer program 430, it implements the steps in the circuit breaker failure detection method embodiment described above, for example... Figure 1 Steps S101 to S103 shown Figure 2 Steps S201 to S204 are shown. Alternatively, when processor 410 executes computer program 430, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 3 The functions of modules 310 to 320 are shown. The communication module 440 can be a separate communication unit used to communicate with external servers or terminal devices.

[0105] Electronic device 40 may include, but is not limited to, a processor 410 and a memory 420. Those skilled in the art will understand that... Figure 4 This is merely an example of electronic device 40 and does not constitute a limitation on electronic device 40. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 40 may also include input transmitting devices, network access devices, buses, etc.

[0106] The processor 410 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0107] In some embodiments, memory 420 may be an internal storage unit of electronic device 40, such as a hard disk or memory of electronic device 40. Memory 420 may also be an external storage device of electronic device 40, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on electronic device 40. Memory 420 may also include both internal and external storage units of electronic device 40. Memory 420 is used to store operating system, applications, bootloader, data, and other programs, such as the program code of computer program 430. Memory 420 may also be used for temporary storage of data that has been sent or will be sent.

[0108] Furthermore, those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. In the various embodiments of this application, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0109] This application provides a computer-readable storage medium storing a computer program that, when run on an electronic device, causes the electronic device to perform the steps described in the various method embodiments above.

[0110] This application provides a chip, which includes a processor and a memory. The memory stores a computer program, which, when executed by the processor, implements the steps in the above-described method embodiments.

[0111] This application provides a computer program product that, when run on an electronic device, causes the electronic device to execute the steps described in the various method embodiments above.

[0112] It should be understood that the processor mentioned in the embodiments of this application can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0113] It should also be understood that the memory mentioned in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM).

[0114] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0115] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0116] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0117] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.

[0118] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0119] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0120] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a large-screen device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0121] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for determining circuit breaker failure, characterized in that, Applied to a protective device, the method includes: Multiple sets of current sequences are acquired, each corresponding to a multi-phase line. The first set of current sequences includes multiple first-phase currents, which are multiple consecutive phase currents collected by the protection device within a first preset time period according to a preset sampling frequency. The end time corresponding to the first preset time period is the current time, and the start time corresponding to the first preset time period is the time before the current time, which is an interval of sampling period from the current time. The first set of current sequences is any one of the multiple sets of current sequences, and the sampling period is the reciprocal of the preset sampling frequency. Determine multiple fundamental current amplitude values ​​corresponding to the multiple sets of current sequences, wherein the multiple fundamental current amplitude values ​​correspond one-to-one with the multiple sets of current sequences; The zero-sequence current is determined based on multiple second-phase currents. The multiple second-phase currents are multiple phase currents collected by the protection device at the current moment, and the multiple second-phase currents correspond one-to-one with the multi-phase line. If the zero-sequence current is greater than or equal to a preset zero-sequence current threshold, and the amplitude values ​​of the plurality of current fundamental waves meet a first preset condition, then the protection device is determined to be in a circuit breaker failure state.

2. The circuit breaker failure detection method according to claim 1, characterized in that, Prior to the step of obtaining multiple sets of current sequences, the method further includes: If only the first phase line is in a short-circuit state, a disconnect command is sent to the circuit breaker corresponding to the first phase line. The first phase line is any one of the multi-phase lines. The disconnect command is used to instruct the circuit breaker to change the line state to an open state. If all the multi-phase lines are in the short-circuit state, then the disconnect command is sent to the multiple circuit breakers corresponding to the multi-phase lines respectively.

3. The circuit breaker failure detection method according to claim 2, characterized in that... ； If only the first phase line is in a short circuit state, then the first preset condition is that only the first current base amplitude value is greater than or equal to the preset base amplitude value among the plurality of current base amplitude values. The first current base amplitude value is a current base amplitude value corresponding to the first phase line among the plurality of current base amplitude values. If all the multi-phase lines are in the short-circuit state, then the first preset condition is that there is a second current fundamental amplitude value among the multiple current fundamental amplitude values, the second current fundamental amplitude value is greater than the preset fundamental amplitude value, and the second current fundamental amplitude value is any one of the multiple current fundamental amplitude values.

4. The circuit breaker failure detection method according to claim 3, characterized in that... ； If only the first phase line is in a short circuit state, then determining that the protection device is in a circuit breaker failure state includes: Obtain the location of the first circuit breaker corresponding to the first phase line; If the first circuit breaker is in the closed position, then the protection device is determined to be in a circuit breaker failure state; If all the multi-phase lines are in the short-circuit state, then determining that the protection device is in a circuit breaker failure state includes: Obtain the locations of multiple second circuit breakers corresponding to the multiphase line; If any of the plurality of second circuit breaker positions is in the closed position, then the protection device is determined to be in a circuit breaker malfunction state.

5. The circuit breaker failure detection method according to claim 2, characterized in that, If all the multi-phase lines are in the short-circuit state, determining that the protection device is in a circuit breaker failure state includes: The negative sequence current is determined based on the plurality of second phase currents; If the negative sequence current is greater than or equal to a preset negative sequence current threshold, then the protection device is determined to be in a circuit breaker failure state.

6. The circuit breaker failure detection method according to claim 1, characterized in that, After determining that the current state is a circuit breaker failure state, the method further includes: If the protection device remains in the circuit breaker failure state for a second preset time period, the circuit breaker failure protection action is executed. The start time of the second preset time period is the current time, and the duration of the second preset time period is the preset duration.

7. The circuit breaker failure determination method according to any one of claims 1 to 6, characterized in that, Determining the multiple fundamental current amplitude values ​​corresponding to the multiple sets of current sequences includes: Based on the full-cycle Fourier algorithm, the amplitude values ​​of multiple current fundamental waves corresponding to the multiple sets of current sequences are determined.

8. A circuit breaker failure detection device, characterized in that, The device includes: an acquisition module and a processing module; The acquisition module is used to acquire multiple sets of current sequences, each set of current sequences corresponding to a multi-phase line. The first set of current sequences includes multiple first-phase currents, which are multiple continuous phase currents collected by the protection device within a first preset time period according to a preset sampling frequency. The end time corresponding to the first preset time period is the current time, and the start time corresponding to the first preset time period is the time before the current time, which is an interval of sampling period from the current time. The first set of current sequences is any one of the multiple sets of current sequences, and the sampling period is the reciprocal of the preset sampling frequency. The processing module is used to determine multiple fundamental current amplitude values ​​corresponding to the multiple sets of current sequences, wherein the multiple fundamental current amplitude values ​​correspond one-to-one with the multiple sets of current sequences. The processing module is also used to determine the zero-sequence current based on multiple second-phase currents, wherein the multiple second-phase currents are multiple phase currents collected by the protection device at the current moment, and the multiple second-phase currents correspond one-to-one with the multi-phase line; The processing module is further configured to determine that the protection device is in a circuit breaker failure state when the zero-sequence current is greater than or equal to a preset zero-sequence current threshold and the amplitude values ​​of the plurality of current fundamental waves meet a first preset condition.

9. An electronic device, characterized in that, It includes a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the circuit breaker failure detection method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the circuit breaker failure detection method as described in any one of claims 1 to 7.

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