Distance protection method and device, electronic equipment and computer readable storage medium

Abstract

The invention relates to the technical field of power system relay protection, in particular to a distance protection method and device, electronic equipment and a computer readable storage medium. The method comprises the steps that multiple voltage amplitudes corresponding to a multi-phase line are obtained, multiple current fundamental wave amplitudes corresponding to the multi-phase line are obtained, and the multiple voltage amplitudes, the multiple current fundamental wave amplitudes and the multi-phase line are in one-to-one correspondence. And according to the plurality of voltage amplitudes and the plurality of current fundamental wave amplitudes, the local side impedance is determined. If the impedance of the side is smaller than the preset impedance constant value, the protection device does not collect the locking reclosing signal, the protection device does not collect the low-air-pressure locking reclosing signal, and the circuit breaker is not in the off-position state, the distance protection action is executed. According to the invention, when the pilot protection channel is abnormal, full-line quick-action distance protection can be realized through home terminal measurement, so that the speed of distance protection when the pilot protection channel is abnormal is improved.

Description

Technical Field

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

[0002] Longitudinal protection, as a core solution for power system line protection, achieves rapid fault clearing across the entire line by comparing electrical parameters (including current phase, direction, and waveform characteristics) at both ends of the line in real time. The protection range of longitudinal protection can fully cover the entire length of the line and is typically used as the primary protection.

[0003] However, longitudinal protection relies on fiber optic channels or carrier channels for data exchange between the two ends. When the channel malfunctions (such as fiber breakage or carrier interference), the longitudinal protection will shut down, causing the system to lose its full-line speed-up capability. When longitudinal protection fails, the system automatically switches to distance protection. However, the first stage of distance protection (distance stage 1) is usually set to 80% of the total line length (to avoid measurement errors from end-point faults), and the remaining 20% ​​needs to be cleared by the second stage (distance stage 2, with a delay of 0.3–0.5 seconds). The delay in clearing faults in the remaining 20% ​​of the line may cause system stability problems (such as generator loss of synchronism). Some short lines or medium- and low-voltage lines are not equipped with longitudinal protection due to cost constraints, relying only on distance stage 1 protection, resulting in a protection blind zone (20% uncovered area) at the end of the line.

[0004] The channel dependency of longitudinal protection makes it prone to failure during anomalies. The existing distance protection system (Section I) cannot cover the entire line, and the delay in Section II affects system transient stability. Some lines lack longitudinal protection due to cost considerations, sacrificing protection performance. Summary of the Invention

[0005] This application provides a distance protection method, apparatus, electronic device, and computer-readable storage medium. It enables full-line fast-acting distance protection through local measurement when the longitudinal protection channel is abnormal, thereby improving the speed of distance protection in the event of a longitudinal protection channel malfunction.

[0006] Firstly, this application provides a distance protection method applicable to a protection device. The method includes: acquiring multiple voltage amplitudes corresponding to a multi-phase line, and acquiring multiple fundamental current amplitudes corresponding to the multi-phase line, wherein the multiple voltage amplitudes, multiple fundamental current amplitudes, and the multi-phase line are all one-to-one correspondences. Based on the multiple voltage amplitudes and multiple fundamental current amplitudes, the impedance on this side is determined. If the impedance on this side is less than a preset impedance value, the protection device does not acquire a reclosing blocking signal, the protection device does not acquire a low-pressure reclosing blocking signal, and the circuit breaker is not in the open position, then distance protection action is performed.

[0007] In some implementations, acquiring multiple voltage amplitudes corresponding to a multi-phase line and acquiring multiple fundamental current amplitudes corresponding to a multi-phase line includes: acquiring multiple sets of voltage sequences and multiple sets of current sequences, each corresponding to a multi-phase line; the first set of voltage sequences includes multiple first-phase voltages, which are multiple consecutive phase voltages collected by the protection device within a first preset time period according to a preset sampling frequency; 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 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 voltage sequences is any one of the multiple sets of voltage sequences; 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. Based on the multiple sets of voltage sequences, multiple voltage amplitudes are determined, each corresponding to a one-to-one correspondence between the multiple sets of voltage sequences and the multiple sets of current sequences. Based on the multiple sets of current sequences, multiple fundamental current amplitudes are determined, each corresponding to a one-to-one correspondence between the multiple sets of current sequences and the multiple sets of current sequences.

[0008] In some implementations, if a three-phase reclosing operation is detected, a distance protection action is performed, including: if there is no synchronous voltage disconnection and no bus voltage disconnection, then a distance protection action is performed.

[0009] In some implementations, performing distance protection actions includes: if no circuit breaker position change information is detected and no current change information is detected, then performing distance protection actions, wherein the circuit breaker position change information is the presence of a circuit breaker position changing from open to closed, and the current change information is the current changing from zero to positive.

[0010] In some implementations, acquiring multiple voltage amplitudes corresponding to a multiphase line and acquiring multiple fundamental current amplitudes corresponding to a multiphase line includes: if the longitudinal protection channel is abnormal and the extended distance protection control word is set to active, then acquiring multiple voltage amplitudes corresponding to a multiphase line and acquiring multiple fundamental current amplitudes corresponding to a multiphase line.

[0011] In some implementations, acquiring multiple voltage amplitudes corresponding to a multiphase line and acquiring multiple fundamental current amplitudes corresponding to a multiphase line includes: if there is no longitudinal protection and the extended distance protection control word is set to active, then acquiring multiple voltage amplitudes corresponding to a multiphase line and acquiring multiple fundamental current amplitudes corresponding to a multiphase line.

[0012] In some implementations, if the local impedance is less than a preset impedance setting, the protection device does not collect a reclosing lockout signal, the protection device does not collect a low-pressure reclosing lockout signal, and the circuit breaker is not in the open position, then a distance protection action is performed. This includes: if the local impedance is less than a preset impedance setting, and the protection device does not collect a reclosing lockout signal, the low-pressure reclosing lockout signal, and the circuit breaker is not in the open position, then the current time is recorded as the first time. If, within the target time period, the local impedance is less than the preset impedance setting, the protection device does not collect a reclosing lockout signal, the protection device does not collect a low-pressure reclosing lockout signal, and the circuit breaker is not in the open position, then a distance protection action is performed. The start time corresponding to the target time period is the first time, and the duration corresponding to the target time period is the preset duration.

[0013] Secondly, this application provides a distance protection device, which includes: an acquisition module and a processing module;

[0014] The acquisition module is used to acquire multiple voltage amplitudes corresponding to multiphase lines, and to acquire multiple fundamental current amplitudes corresponding to multiphase lines. The multiple voltage amplitudes, multiple fundamental current amplitudes and multiphase lines are all in one-to-one correspondence.

[0015] The processing module is used to determine the impedance on this side based on multiple voltage amplitudes and multiple fundamental current amplitudes.

[0016] The processing module is also used to perform distance protection actions when the impedance on this side is less than the preset impedance value, the protection device does not collect the blocking reclosing signal, the protection device does not collect the low gas pressure blocking reclosing signal, and the circuit breaker is not in the open position.

[0017] Thirdly, this application provides a chip for performing the methods described in any of the first aspects above.

[0018] 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,

[0019] Electronic devices include chips, as described in the third aspect.

[0020] 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.

[0021] 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.

[0022] In the technical solution provided in this application, the protection device can acquire multiple voltage amplitudes corresponding to multi-phase lines, and multiple fundamental current amplitudes corresponding to multi-phase lines, with each voltage amplitude, current amplitude, and multi-phase line corresponding to a specific value. Based on these voltage and current amplitudes, the local impedance is determined. If the local impedance is less than a preset impedance value, the protection device fails to acquire a reclosing blocking signal or a low-pressure reclosing blocking signal, and the circuit breaker is not in the open position, then distance protection is activated. The technical solution provided in this application enables rapid distance protection across the entire line through local measurement when the longitudinal protection channel is abnormal, without relying on a communication channel, thereby improving the speed of distance protection when the longitudinal protection channel is abnormal. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of a distance protection process provided in an embodiment of the present application for distance protection;

[0025] Figure 2 This is a schematic diagram of a distance protection device provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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]."

[0031] 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.

[0032] 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.

[0033] Longitudinal protection, as a core solution for power system line protection, achieves rapid fault clearing across the entire line by comparing electrical parameters (including current phase, direction, and waveform characteristics) at both ends of the line in real time. The protection range of longitudinal protection can fully cover the entire length of the line and is typically used as the primary protection.

[0034] However, longitudinal protection relies on fiber optic channels or carrier channels for data exchange between the two ends. When the channel malfunctions (such as fiber breakage or carrier interference), the longitudinal protection will shut down, causing the system to lose its full-line speed-up capability. When longitudinal protection fails, the system automatically switches to distance protection. However, the first stage of distance protection (distance stage 1) is usually set to 80% of the total line length (to avoid measurement errors from end-point faults), and the remaining 20% ​​needs to be cleared by the second stage (distance stage 2, with a delay of 0.3–0.5 seconds). The delay in clearing faults in the remaining 20% ​​of the line may cause system stability problems (such as generator loss of synchronism). Some short lines or medium- and low-voltage lines are not equipped with longitudinal protection due to cost constraints, relying only on distance stage 1 protection, resulting in a protection blind zone (20% uncovered area) at the end of the line.

[0035] The channel dependency of longitudinal protection makes it prone to failure during anomalies. The existing distance protection system (Section I) cannot cover the entire line, and the delay in Section II affects system transient stability. Some lines lack longitudinal protection due to cost considerations, sacrificing protection performance.

[0036] In view of this, the present application provides a distance protection method that can achieve full-line fast-acting distance protection by local measurement when the longitudinal protection channel is abnormal, without relying on the communication channel, thereby improving the speed of distance protection when the longitudinal protection channel is abnormal.

[0037] It should be understood that when the line is equipped with longitudinal protection and the longitudinal protection channel is in normal condition, the existing longitudinal protection method can be used to achieve full-line fast protection.

[0038] If the line is equipped with longitudinal protection, but the longitudinal protection channel is abnormal and the extended distance protection control word is set to active, the protection device can use the technical solution provided in the embodiments of this application to achieve full-line fast protection.

[0039] If the line is not equipped with longitudinal protection (there is no longitudinal protection), and the extended distance protection control word is set to active, the protection device can also use the technical solution provided in the embodiments of this application to achieve full-line fast protection.

[0040] The technical solutions provided by the embodiments of this application are described below with reference to the examples in the accompanying drawings.

[0041] Figure 1 This is a schematic diagram of a distance protection process provided in an embodiment of this application. Figure 1 As shown, the process of the protection device performing distance protection actions may include the following steps:

[0042] Step S101: Obtain multiple voltage amplitudes corresponding to the multiphase line, and obtain multiple fundamental current amplitudes corresponding to the multiphase line. The multiple voltage amplitudes, multiple fundamental current amplitudes, and multiphase lines are all one-to-one correspondences.

[0043] In this embodiment of the application, the method for the protection device to acquire multiple voltage amplitudes corresponding to a multi-phase line, and the method for acquiring multiple fundamental current amplitudes corresponding to a multi-phase line, may include the following steps:

[0044] Step A1: Obtain multiple sets of voltage sequences and multiple sets of current sequences. The multiple sets of voltage sequences and multiple sets of current sequences correspond one-to-one with the multi-phase lines. The first set of voltage sequences includes multiple first-phase voltages, which are multiple continuous phase voltages collected by the protection device within a first preset time period according to a preset sampling frequency. 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 voltage sequences and the first set of current sequences are any one of the multiple sets of current sequences. The sampling period is the reciprocal of the preset sampling frequency.

[0045] In this embodiment, the protection device can collect the voltage and current corresponding to the multi-phase lines according to a preset sampling frequency, and realize distance protection (extended distance protection) by using the real-time collected voltage and current corresponding to the multi-phase lines. Specifically,

[0046] The protection device can achieve distance protection by comparing the multiple voltages corresponding to the multiphase line collected at the current moment with the multiple voltages corresponding to the multiphase line collected in a sampling period before the current moment, and the multiple currents corresponding to the multiphase line collected at the current moment with the multiple currents corresponding to the multiphase line collected in a sampling period before the current moment.

[0047] For example, a multi-phase line can be a three-phase line, and the multiple voltage sequences are equivalent to three voltage sequences. Each voltage sequence includes the voltage corresponding to the most recently acquired phase of the line by the protection device within a sampling period according to a preset sampling frequency. Similarly, the 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.

[0048] For example, if a protection device can collect voltage and current data 24 times within one sampling period, and the multiphase lines are designated as phase A, phase B, and phase C, then the multiple voltage sequences are: the voltage sequence corresponding to phase A, the voltage sequence corresponding to phase B, and the voltage sequence corresponding to phase C. The voltage sequence corresponding to phase A includes the voltage collected at the current moment and 23 voltages collected by the protection device before the current moment. The voltage sequence corresponding to phase B includes the voltage collected at the current moment and 23 voltages collected by the protection device before the current moment. The voltage sequence corresponding to phase C includes the voltage collected at the current moment and 23 voltages collected by the protection device before the current moment. Similarly, 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 collected at the current moment and 23 currents collected by the protection device before the current moment. The current sequence for phase B includes the current of phase B collected at the current moment, and 23 currents of phase B collected by the protection device before the current moment. The current sequence for phase C includes the current of phase C collected at the current moment, and 23 currents of phase C collected by the protection device before the current moment.

[0049] Step A2: Based on multiple voltage sequences, determine multiple voltage amplitudes, with each voltage amplitude corresponding to one of the multiple voltage sequences.

[0050] In the technical solution provided in this application embodiment, the protection device can calculate multiple voltage amplitudes corresponding to multiple voltage sequences using existing current fundamental amplitude calculation methods. For example, the protection device can use a full-cycle Fourier algorithm to calculate multiple voltage amplitudes corresponding to multiple voltage sequences. This application will not be elaborated upon here.

[0051] Step A3: Based on multiple sets of current sequences, determine multiple fundamental current amplitude values, with each fundamental current amplitude value corresponding to one of the multiple sets of current sequences.

[0052] 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.

[0053] Step S102: Determine the impedance on this side based on multiple voltage amplitudes and multiple fundamental current amplitudes.

[0054] impedance on this side The calculation formula can be:

[0055] in, Indicates voltage amplitude. This indicates the amplitude of the fundamental current wave.

[0056] Step S103: If the impedance on this side is less than the preset impedance value, the protection device does not collect the lockout reclosing signal, the protection device does not collect the low gas pressure lockout reclosing signal, and the circuit breaker is not in the open position, then the distance protection action is executed.

[0057] The preset impedance value can be the extended distance operation setting, which can be greater than the impedance value of the entire line length. For example, the extended distance operation setting can be 1.5 times the impedance value of the entire line length, or it can be other values, which are not limited in this application.

[0058] Reclosing blocking is an operation used when a power system experiences a fault or abnormal situation to protect equipment and the system. When the line current crosses zero and the voltage loses its effective signal, the protection device performs reclosing blocking. When a system fault occurs, the protection device can output a blocking signal, preventing the reclosing circuit from closing, thereby protecting equipment and the system from further damage.

[0059] In the technical solution provided in this application embodiment, the protection device performs distance protection when it detects that the distance protection conditions are met. The distance protection conditions may include four conditions; if all four conditions are met simultaneously, the protection device performs distance protection action.

[0060] Distance protection condition 1: The impedance on this side is less than the preset impedance value.

[0061] The protection device can determine whether the fault is within the protection range based on the relationship between the local impedance and the preset impedance value. If the local impedance is less than the preset impedance value, the protection device can determine that the fault is within the protection range.

[0062] Distance protection condition 2: The protection device did not collect the lockout reclosing signal.

[0063] Distance protection condition 3: The protection device did not collect the low air pressure lockout reclosing signal.

[0064] Distance protection condition 4: The circuit breaker is not in the open position.

[0065] Because the extended distance protection range exceeds the entire length of the line, when a permanent fault occurs at the exit of the next-level line, the local protection device will quickly activate the extended distance protection, and the next-level protection device will quickly activate the distance 1 protection. Even after reclosing, the fault may still exist. In this case, the extended distance protection of the local protection device cannot activate or needs to activate with a delay to ensure that the next-level line activates first, guaranteeing selectivity in the permanent fault response.

[0066] If the fault is transient on the next lower level line, the local protection device will not operate, but the extended distance protection will. If distance protection conditions 2 to 4 are met simultaneously, it indicates that in the case of single-phase reclosing, the reclosing device has been engaged and energized, and the extended distance protection will operate.

[0067] In the case of three-phase reclosing, if distance protection conditions 2 to 4 are met simultaneously, it indicates a high probability that the reclosing circuit has been activated and fully energized. Distance protection conditions may also include condition 5: when checking for no voltage or synchronizing activation, there is no synchronizing voltage disconnection or bus voltage disconnection (no synchronizing voltage disconnection and no bus voltage disconnection). In the case of three-phase reclosing, if distance protection conditions 2 to 5 are met simultaneously, it indicates that the reclosing circuit has been activated and fully energized, and the extended distance protection will operate.

[0068] It should be understood that if the distance protection conditions cannot be met simultaneously, the protection device will not perform the extended distance protection action.

[0069] In the technical solution provided in this application embodiment, the protection device can acquire multiple voltage amplitudes corresponding to multi-phase lines, and multiple fundamental current amplitudes corresponding to multi-phase lines, with each voltage amplitude, current amplitude, and multi-phase line corresponding to a specific voltage and current amplitude. Based on these voltage and current amplitudes, the local impedance is determined. If the local impedance is less than a preset impedance value, the protection device fails to acquire a reclosing blocking signal or a low-pressure reclosing blocking signal, and the circuit breaker is not in the open position, then distance protection is activated. The technical solution provided in this application embodiment enables full-area distance protection through local measurement when the longitudinal protection channel is abnormal, without relying on a communication channel, thereby improving the speed of distance protection when the longitudinal protection channel is abnormal.

[0070] In some embodiments, the distance protection condition may further include distance protection condition 6: the protection device is not in the post-acceleration state, that is, the post-acceleration element meets the judgment condition.

[0071] In this embodiment of the application, if the protection device does not detect any change in the circuit breaker position (the circuit breaker position changes from open to closed) and the protection device does not detect any change in current (the collected current changes from zero to one), then the protection device is not in the post-acceleration state.

[0072] When the circuit breaker position acquired by the protection device changes from open to closed, or when the acquired current increases from zero to some, the protection device is in a post-acceleration state. When the protection device is in a post-acceleration state, the post-acceleration element does not meet the requirements.

[0073] In some embodiments, to avoid misjudgments caused by voltage or current fluctuations or calculation errors, the protection device may record the duration for which the distance protection conditions are met before executing the distance protection action. If the distance protection conditions are met within the target time period, the protection device will execute the distance protection action.

[0074] Specifically, if the impedance on this side is less than the preset impedance setting, and the protection device does not collect a reclosing lockout signal, does not collect a low-pressure reclosing lockout signal, and the circuit breaker is not in the open position, then the current time is recorded as the first moment. If, within the target time period, the impedance on this side is less than the preset impedance setting, the protection device does not collect a reclosing lockout signal, the protection device does not collect a low-pressure reclosing lockout signal, and the circuit breaker is not in the open position, then distance protection is executed, the start time corresponding to the target time period is the first moment, and the duration corresponding to the target time period is the preset duration.

[0075] 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.

[0076] Corresponding to the distance protection method in the above embodiments, this application provides a distance protection device 20. The distance protection device 20 can be implemented as part or all of a computer device by software, hardware, or a combination of both, and is used to perform the steps in the distance protection method in the above embodiments.

[0077] Figure 2 A schematic diagram of a distance protection 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.

[0078] Reference Figure 2 The distance protection device 20 includes an acquisition module 210 and a processing module 220.

[0079] The acquisition module 210 is used to acquire multiple voltage amplitudes corresponding to the multiphase line, and to acquire multiple fundamental current amplitudes corresponding to the multiphase line. The multiple voltage amplitudes, multiple fundamental current amplitudes and multiphase lines are all in one-to-one correspondence.

[0080] The processing module 220 is used to determine the impedance on this side based on multiple voltage amplitudes and multiple current fundamental amplitudes.

[0081] The processing module 220 is also used to perform distance protection actions when the impedance on this side is less than the preset impedance value, the protection device does not collect the blocking reclosing signal, the protection device does not collect the low gas pressure blocking reclosing signal, and the circuit breaker is not in the open position.

[0082] In some embodiments, the acquisition module 210 is specifically used to: acquire multiple sets of voltage sequences and multiple sets of current sequences, wherein the multiple sets of voltage sequences, multiple sets of current sequences, and multi-phase lines correspond one-to-one; the first set of voltage sequences includes multiple first phase voltages, which are multiple consecutive phase voltages collected by the protection device within a first preset time period according to a preset sampling frequency; 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; 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 voltage sequences is any one of the multiple sets of voltage sequences; 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.

[0083] Based on multiple voltage sequences, multiple voltage amplitudes are determined, and each voltage amplitude corresponds one-to-one with a voltage sequence.

[0084] Based on multiple sets of current sequences, multiple fundamental current amplitude values ​​are determined, and each of the multiple fundamental current amplitude values ​​corresponds one-to-one with a set of current sequences.

[0085] In some embodiments, the processing module 220 is specifically used to: perform distance protection action if there is no synchronous voltage disconnection and no bus voltage disconnection.

[0086] In some embodiments, the processing module 220 is specifically used to: perform distance protection action when no circuit breaker position change information is detected and no current change information is detected, wherein the circuit breaker position change information is that the circuit breaker position changes from open to closed, and the current change information is that the current changes from zero to positive.

[0087] In some embodiments, the acquisition module 210 is specifically used to: if the longitudinal protection channel is abnormal and the extended distance protection control word is set to active, acquire multiple voltage amplitudes corresponding to the multiphase line, and acquire multiple current fundamental amplitudes corresponding to the multiphase line.

[0088] In some embodiments, the acquisition module 210 is specifically used to: if there is no longitudinal protection and the extended distance protection control word is set to active, acquire multiple voltage amplitudes corresponding to the multiphase line, and acquire multiple fundamental current amplitudes corresponding to the multiphase line.

[0089] In some embodiments, the processing module 220 is specifically used to: if the local impedance is less than a preset impedance setting, and the protection device does not collect a reclosing lockout signal, does not collect a low-pressure reclosing lockout signal, and the circuit breaker position is not in the open position, then record the current time as the first time. If, within the target time period, the local impedance is less than the preset impedance setting, the protection device does not collect a reclosing lockout signal, the protection device does not collect a low-pressure reclosing lockout signal, and the circuit breaker position is not in the open position, then perform distance protection action, the start time corresponding to the target time period is the first time, and the duration corresponding to the target time period is the preset duration.

[0090] 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.

[0091] 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.

[0092] Based on the same inventive concept, embodiments of this application also provide an electronic device.

[0093] Figure 3 This is a schematic diagram of the structure of the electronic device provided in an embodiment of this application. For example... Figure 3 As shown, the electronic device 30 of this embodiment includes: at least one processor 310 ( Figure 3 Only one is shown in the diagram. The processor 310 includes a memory 320 and a communication module 340. The memory 320 stores a computer program 330 that may run on the processor 310. When the processor 310 executes the computer program 330, it implements the steps described in the distance protection method embodiment above, for example... Figure 1 Steps S101 to S103 are shown. Alternatively, when processor 310 executes computer program 330, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 2 The functions of modules 210 to 220 are shown. The communication module 340 can be a separate communication unit used to communicate with external servers or terminal devices.

[0094] Electronic device 30 may include, but is not limited to, a processor 310 and a memory 320. Those skilled in the art will understand that... Figure 3 This is merely an example of electronic device 30 and does not constitute a limitation on electronic device 30. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 30 may also include input transmitting devices, network access devices, buses, etc.

[0095] The processor 310 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.

[0096] In some embodiments, memory 320 may be an internal storage unit of electronic device 30, such as a hard disk or memory of electronic device 30. Memory 320 may also be an external storage device of electronic device 30, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., provided on electronic device 30. Memory 320 may also include both internal and external storage units of electronic device 30. Memory 320 is used to store operating system, applications, bootloader, data, and other programs, such as the program code of computer program 330. Memory 320 may also be used to temporarily store data that has been sent or will be sent.

[0097] 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.

[0098] 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.

[0099] 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 various method embodiments described above.

[0100] 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.

[0101] 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.

[0102] 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).

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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 apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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 distance protection method, characterized in that, The method includes the application of a protection device: Multiple voltage amplitudes corresponding to the multiphase line are obtained, and multiple fundamental current amplitudes corresponding to the multiphase line are obtained, wherein the multiple voltage amplitudes, the multiple fundamental current amplitudes, and the multiphase line are all in one-to-one correspondence. The impedance on this side is determined based on the plurality of voltage amplitudes and the plurality of fundamental current amplitudes. If the impedance on this side is less than the preset impedance value, the protection device does not collect the lockout reclosing signal, the protection device does not collect the low gas pressure lockout reclosing signal, and the circuit breaker is not in the open position, then the distance protection action is executed.

2. The distance protection method according to claim 1, characterized in that, The acquisition of multiple voltage amplitudes corresponding to the multiphase line and the acquisition of multiple fundamental current amplitudes corresponding to the multiphase line include: Multiple sets of voltage sequences and multiple sets of current sequences are acquired, and the multiple sets of voltage sequences, the multiple sets of current sequences, and the multi-phase line are corresponding one-to-one. The first set of voltage sequences includes multiple first-phase voltages, which are multiple consecutive phase voltages collected by the protection device within a first preset time period according to a preset sampling frequency. The first set of current sequences includes multiple first-phase currents, which are multiple consecutive phase currents collected by the protection device within the first preset time period according to the 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 voltage sequences is any one of the multiple sets of voltage sequences, 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. Based on the multiple sets of voltage sequences, the multiple voltage amplitudes are determined, and the multiple voltage amplitudes correspond one-to-one with the multiple sets of voltage sequences; Based on the multiple sets of current sequences, the multiple fundamental current amplitude values ​​are determined, and the multiple fundamental current amplitude values ​​correspond one-to-one with the multiple sets of current sequences.

3. The distance protection method according to claim 1, characterized in that, If a three-phase reclosing operation is detected, the execution of the distance protection action includes: If there is no synchronous voltage disconnection and no bus voltage disconnection, then the distance protection action is executed.

4. The distance protection method according to claim 1, characterized in that, The execution of the distance protection action includes: If no circuit breaker position change information is detected and no current change information is detected, the distance protection action is executed. The circuit breaker position change information is that the circuit breaker position changes from open to closed, and the current change information is that the current changes from zero to positive.

5. The distance protection method according to claim 1, characterized in that, The acquisition of multiple voltage amplitudes corresponding to the multiphase line and the acquisition of multiple fundamental current amplitudes corresponding to the multiphase line include: If the longitudinal protection channel is abnormal and the extended distance protection control word is set to active, then the multiple voltage amplitudes corresponding to the multiphase line are obtained, and the multiple current fundamental amplitudes corresponding to the multiphase line are obtained.

6. The distance protection method according to claim 1, characterized in that, The acquisition of multiple voltage amplitudes corresponding to the multiphase line and the acquisition of multiple fundamental current amplitudes corresponding to the multiphase line include: If there is no longitudinal protection and the extended distance protection control word is set to active, then the multiple voltage amplitudes corresponding to the multiphase line are obtained, and the multiple current fundamental amplitudes corresponding to the multiphase line are obtained.

7. The distance protection method according to any one of claims 1 to 6, characterized in that, If the impedance on this side is less than a preset impedance value, the protection device does not collect a reclosing lockout signal, the protection device does not collect a low-pressure reclosing lockout signal, and the circuit breaker is not in the open position, then a distance protection action is executed, including: If the impedance on this side is less than the preset impedance value, and the protection device does not collect the blocking reclosing signal, does not collect the low gas pressure blocking reclosing signal, and the circuit breaker is not in the open position, then the current time is recorded as the first time. If, within the target time period, the impedance on this side is less than the preset impedance value, the protection device does not collect a lockout reclosing signal, the protection device does not collect a low-pressure lockout reclosing signal, and the circuit breaker is not in the open position, then the distance protection action is executed. The starting time corresponding to the target time period is the first time, and the duration corresponding to the target time period is the preset duration.

8. A distance protection device, characterized in that, The device includes: an acquisition module and a processing module; The acquisition module is used to acquire multiple voltage amplitudes corresponding to the multiphase line, and to acquire multiple fundamental current amplitudes corresponding to the multiphase line, wherein the multiple voltage amplitudes, the multiple fundamental current amplitudes, and the multiphase line are all in one-to-one correspondence. The processing module is used to determine the impedance on this side based on the plurality of voltage amplitudes and the plurality of fundamental current amplitudes. The processing module is also used to perform distance protection action when the impedance on the local side is less than the preset impedance value, the protection device does not collect the blocking reclosing signal, the protection device does not collect the low gas pressure blocking reclosing signal, and the circuit breaker is not in the open position.

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 distance protection 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 distance protection method as described in any one of claims 1 to 7.

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