An active grounding current detection device capable of quickly uploading data

Abstract

The application relates to the technical field of ground fault detection of a small-current grounding system, and discloses an active grounding current detection device capable of rapidly uploading data. The device comprises a grounding current detection module and a data uploading module; the grounding current detection module is used for collecting zero sequence voltage signals of three-phase high-voltage lines of a power distribution network to calculate zero sequence voltage amplitudes, determining that a grounding current fault occurs when the zero sequence voltage amplitudes exceed preset limit values, and collecting zero sequence current signals of fault lines; the uploading module comprises an equipment area, a data processing area and a data transmission area, the equipment area is used for real-time sampling and management of data of the grounding current detection module, the data processing area is used for pre-processing of data, and the data transmission area is used for segmenting the task of uploading data, uploading part of task bits to a cloud server, and placing the remaining part of task bits in next transmission calculation. The application realizes real-time detection of grounding current faults, and improves the data uploading efficiency.

Description

Technical Field

[0001] This invention relates to the field of grounding fault detection technology for low-current grounding systems, and in particular to an active grounding current detection device capable of rapidly uploading data. Background Technology

[0002] Most power systems operate with an ungrounded neutral point, i.e., a low-current grounding detection system. Single-phase grounding is a common type of grounding fault in low-current grounding detection systems. In actual operation of distribution network lines, the long length, wide distribution, and complex terrain of these lines result in single-phase grounding faults being characterized by their concealment, high frequency, and complexity. Especially under severe weather conditions, this grounding fault occurs more frequently and is more difficult to detect.

[0003] Existing ground current detection methods typically employ the first half-wave method. The principle of this method is to sample the first half-wave of the capacitive current and the voltage waveform at the instant of grounding and compare their phases. When the phases of the first half-wave of the capacitive current and the voltage at the instant of grounding satisfy a certain relationship, and simultaneously the conductor-to-ground voltage decreases, a ground fault is determined to have occurred. However, this method suffers from high workload, poor real-time performance, and slow transmission rates when uploading ground current detection data to the cloud, resulting in inaccurate and slow fault diagnosis. Summary of the Invention

[0004] This invention provides an active grounding current detection device that can quickly upload data. It can perform real-time fault judgment on grounding current and quickly upload the corresponding detection data, thus solving the technical problems of real-time detection and rapid data upload of grounding current.

[0005] This invention provides an active grounding current detection device capable of rapidly uploading data, the device comprising a grounding current detection module and a data uploading module connected in series;

[0006] The grounding current detection module is used to collect the zero-sequence voltage signal of the three-phase high-voltage line of the distribution network, calculate the zero-sequence voltage amplitude based on the zero-sequence voltage signal, and determine that a grounding current fault has occurred when the zero-sequence voltage amplitude exceeds the preset limit value, and collect the zero-sequence current signal of the fault line.

[0007] The upload module includes a connected device area, a data processing area, and a data transmission area. The device area is used to sample and manage the detection data from the ground current detection module in real time. The data processing area is used to preprocess the data in the device area. The data transmission area is used to upload the data from the data processing area to the cloud server. When uploading data, the data transmission area divides the number of task bits to be uploaded into two parts according to a proportional division coefficient. One part of the task bits is uploaded, and the remaining task bits are placed in the next transmission calculation.

[0008] According to one embodiment of the present invention, the device area includes a real-time control unit and a data management unit connected to each other; the real-time control unit is used to sample the detection data of the ground current detection module in real time; the data management unit is used to compress and store the data sampled by the real-time control unit.

[0009] According to one achievable method of the present invention, when the data processing area preprocesses the data in the device area, it specifically performs the following:

[0010] The zero-sequence current signal of the faulty line is normalized according to the following formula:

[0011]

[0012] In the formula, h i The result after preprocessing the zero-sequence current signal of the faulty line, l i Let l be the zero-sequence current value of the faulty line sampled in the i-th time. T This is the preset current base.

[0013] According to one achievable method of the present invention, when the data processing area performs normalization processing on the zero-sequence current signal of the faulty line, it is specifically used for:

[0014] The preset current base value is set to 50A.

[0015] According to one achievable method of the present invention, the data transmission area is further used to determine the computation delay of the task, and to adjust the proportional segmentation coefficient when the computation delay is higher than a preset computation delay threshold.

[0016] According to one achievable method of the present invention, the data transmission area determines the computation delay of the task, specifically for:

[0017] Let α k m is the proportional division coefficient. k This indicates the bit length of task k, and the data transmission area will contain a portion of the task's bit length α. k m kUpload the remaining task bits (1-α) k )m k If placed in the next transmission calculation, the task's calculation delay is determined according to the following formula:

[0018]

[0019] In the formula, t off，k t represents the computation delay of task k. u，k Indicates the time for sending the uplink task, t c，k t represents the time for data processing. d，k The time r represents the downlink reception time of the calculation result. u，k Let r be the uplink rate of task k. d，k Let B represent the downlink rate of task k, and σ represent the transmission bandwidth. 2 h represents the noise power of the data transmission area. u h represents the uplink channel gain between the data transmission area and the cloud server. d p represents the downlink channel gain between the data transmission area and the cloud server. k q represents the transmit power of the data transmission area. k f is the transmission power of the cloud server. s This refers to the computing frequency of the cloud server.

[0020] According to one achievable method of the present invention, the data transmission area is further used to determine the computational cost of the task, and to adjust the proportional segmentation coefficient when the computational cost is higher than a preset computational cost threshold.

[0021] According to one achievable method of the present invention, when the data transmission area determines the computational cost of a task, it is specifically used for:

[0022] The computational cost of the task is determined using the following formula:

[0023]

[0024] In the formula, cost off，k E represents the computational cost of task k. off，k p is the energy consumption of task k. k t represents the transmit power of the data transmission area. u，k Indicates the time for sending the uplink task, t off，k β represents the computation delay of task k, and β is a preset influence coefficient.

[0025] According to one achievable method of the present invention, the grounding current detection module includes a sampling unit, a core control unit, a high-voltage stability control unit, and a fault determination unit connected in sequence; the sampling unit is used to collect the zero-sequence voltage signal of the three-phase high-voltage line of the distribution network; the core control unit is used to calculate the zero-sequence voltage amplitude based on the zero-sequence voltage signal, and control the high-voltage stability control unit to generate a characteristic current signal when the zero-sequence voltage amplitude exceeds a preset limit value; the fault determination unit is used to determine that a grounding current fault has occurred when the characteristic current signal is detected, and control the sampling unit to collect the zero-sequence current signal of the faulty line.

[0026] According to one achievable method of the present invention, the ground current detection module further includes a fault warning unit connected to the fault determination unit;

[0027] The fault warning unit is used to output corresponding warning information when a ground current fault occurs.

[0028] As can be seen from the above technical solutions, the present invention has the following advantages:

[0029] The device of this invention includes a ground current detection module and a data upload module connected to each other. The ground current detection module is used to collect the zero-sequence voltage signal of the three-phase high-voltage line of the distribution network, calculate the zero-sequence voltage amplitude based on the zero-sequence voltage signal, and determine that a ground current fault has occurred when the zero-sequence voltage amplitude exceeds a preset limit value, and collect the zero-sequence current signal of the faulty line. The upload module includes a device area, a data processing area, and a data transmission area connected to each other. The device area is used to sample and manage the detection data of the ground current detection module in real time. The data processing area is used to preprocess the data in the device area. The data transmission area is used to upload the data in the data processing area to a cloud server. When uploading data, the data transmission area divides the number of task bits to be uploaded into two parts according to a proportional division coefficient. One part of the task bits is uploaded, and the remaining task bits are placed in the next transmission calculation. This invention achieves real-time detection of ground current faults by setting up a ground current detection module, and improves the data upload efficiency by dividing the ground current detection data and uploading it sequentially by setting up a data upload module, thereby solving the technical problems of real-time detection of ground current and rapid data upload. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of an active grounding current detection device capable of rapidly uploading data, provided in an optional embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of a ground current detection module provided in an optional embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the device area provided in an optional embodiment of the present invention.

[0034] Figure label:

[0035] 1-Ground current detection module; 2-Data upload module; 11-Sampling unit; 12-Core control unit; 13-High voltage stability control unit; 14-Fault determination unit; 15-Fault warning unit; 21-Equipment area; 22-Data processing area; 23-Data transmission area; 211-Real-time control unit; 212-Data management unit. Detailed Implementation

[0036] This invention provides an active grounding current detection device capable of rapidly uploading data, which solves the technical problems of real-time detection and rapid data uploading of grounding current.

[0037] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] This invention provides an active grounding current detection device that can quickly upload data.

[0039] Please see Figure 1 , Figure 1 The diagram shows a structural schematic of an active grounding current detection device that can quickly upload data, according to an embodiment of the present invention.

[0040] An active grounding current detection device capable of rapidly uploading data is provided in this embodiment of the invention, comprising a grounding current detection module 1 and a data uploading module 2 connected to each other.

[0041] The grounding current detection module 1 is used to collect the zero-sequence voltage signal of the three-phase high-voltage line of the distribution network, calculate the zero-sequence voltage amplitude based on the zero-sequence voltage signal, and determine that a grounding current fault has occurred when the zero-sequence voltage amplitude exceeds a preset limit value, and collect the zero-sequence current signal of the faulty line. The uploading module includes a connected device area 21, a data processing area 22, and a data transmission area 23. The device area 21 is used to sample and manage the detection data of the grounding current detection module 1 in real time. The data processing area 22 is used to preprocess the data of the device area 21. The data transmission area 23 is used to upload the data of the data processing area 22 to the cloud server. When uploading data, the data transmission area 23 divides the number of task bits to be uploaded into two parts according to the proportional division coefficient. One part of the task bits is uploaded, and the remaining task bits are placed in the next transmission calculation.

[0042] The cloud server can report fault points to the work center and update the stored data in real time.

[0043] In one feasible way, such as Figure 2 As shown, the grounding current detection module 1 includes a sampling unit 11, a core control unit 12, a high-voltage stability control unit 13, and a fault determination unit 14 connected in sequence. The sampling unit 11 is used to collect the zero-sequence voltage signal of the three-phase high-voltage line of the distribution network. The core control unit 12 is used to calculate the zero-sequence voltage amplitude based on the zero-sequence voltage signal, and control the high-voltage stability control unit 13 to generate a characteristic current signal when the zero-sequence voltage amplitude exceeds a preset limit value. The fault determination unit 14 is used to determine that a grounding current fault has occurred when the characteristic current signal is detected, and control the sampling unit 11 to collect the zero-sequence current signal of the faulty line.

[0044] In one specific implementation, the high-voltage stabilization control unit 13 can select a vacuum high-voltage contactor as the device switch.

[0045] In one feasible embodiment, the ground current detection module 1 further includes a fault warning unit 15 connected to the fault determination unit 14;

[0046] The fault warning unit 15 is used to output corresponding warning information when a ground current fault occurs.

[0047] In one specific implementation, the fault warning unit 15 is equipped with a fault warning light and an LED display screen for issuing corresponding warnings, wherein the LED display screen can display specific fault location information.

[0048] In this embodiment of the invention, a specific architecture for the grounding current detection module 1 is provided, which enables real-time detection of grounding current and timely feedback of faults.

[0049] In one feasible way, such as Figure 3 As shown, the device area 21 includes a real-time control unit 211 and a data management unit 212 connected to each other; the real-time control unit 211 is used to sample the detection data of the ground current detection module 1 in real time; the data management unit 212 is used to compress and store the data sampled by the real-time control unit 211.

[0050] In this embodiment of the invention, the real-time control unit 211 samples the data in real time, achieving rapid response and reducing latency. When processing large amounts of data, the data management unit 212 can manage the data in real time, selecting the most suitable method to transform, compress, and store each data variable.

[0051] In one feasible implementation, when the data processing area 22 preprocesses the data of the device area 21, it specifically performs the following:

[0052] The zero-sequence current signal of the faulty line is normalized according to the following formula:

[0053]

[0054] In the formula, h i The result after preprocessing the zero-sequence current signal of the faulty line, l i Let l be the zero-sequence current value of the faulty line sampled in the i-th time. T This is the preset current base.

[0055] In one feasible implementation, when the data processing area 22 normalizes the zero-sequence current signal of the faulty line, it is specifically used for:

[0056] The preset current base value is set to 50A.

[0057] When a ground fault occurs, the current can reach several amperes to tens of amperes. The normal current is on the order of 10. -1 In this embodiment, 50A is taken as the base value, and the zero-sequence current signal of the faulty line is normalized.

[0058] Correspondingly, the same normalization process can be used to normalize the detected zero-sequence voltage to obtain the corresponding scalar value. A preset voltage base can be set according to the actual situation.

[0059] In one feasible manner, the data transmission area 23 is also used to determine the computation delay of the task, and adjust the proportional segmentation coefficient when the computation delay is higher than a preset computation delay threshold.

[0060] When uploading data in data transmission area 23, an asymptotic optimization algorithm is used. This algorithm performs optimal task partitioning on task k for data upload, and proportional partitioning on task k, let α. k The proportional division coefficient is assumed to be m, and task k is assumed to have a length of m. k Bit data, where α k m k Bits represent the first upload, the remaining bits (1-α) k )m k The bits are included in the next transmission calculation. The calculation delay t for task k. off，k It typically includes three parts: the time t for uplink transmission tasks. u，k The time t for cloud server computation (i.e., data processing time) c，k There is also the downlink receiving and calculation time t. d，k Therefore, the computation delay of task k can be expressed as:

[0061]

[0062] In the formula, t off，k t represents the computation delay of task k. u，k Indicates the time for sending the uplink task, t c，k t represents the time for data processing. d，k The time r represents the downlink reception time of the calculation result. u，k Let r be the uplink rate of task k. d，k Let B represent the downlink rate of task k, and σ represent the transmission bandwidth. 2 The noise power of data transmission area 23 is represented by h. u h represents the uplink channel gain between data transmission area 23 and the cloud server. d p represents the downlink channel gain between data transmission area 23 and the cloud server. k q represents the transmit power of data transmission area 23. k f is the transmission power of the cloud server. s This refers to the computing frequency of the cloud server.

[0063] In one feasible approach, the data transmission area 23 is also used to determine the computational cost of the task and adjust the proportional segmentation coefficient when the computational cost is higher than a preset computational cost threshold.

[0064] When uploading data, the energy consumption of computation task k mainly occurs during the uplink transmission task, and the energy consumption can be expressed as:

[0065]

[0066] In the formula, E off，k p is the energy consumption of task k. k This indicates the transmit power of data transmission area 23.

[0067] The computational cost of the task is:

[0068] cost off，k =E off，k +βt off，k

[0069] In the formula, cost off，k β represents the computational cost of task k, and β is the preset influence coefficient.

[0070] In the above embodiments of the present invention, by setting up a ground current detection module 1, real-time detection of ground current faults is achieved. By setting up a data upload module 2, the ground current detection data is segmented and uploaded sequentially, thereby improving the data upload efficiency and solving the technical problems of real-time detection of ground current and rapid data upload.

[0071] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An active grounding current detection device capable of quickly uploading data, characterized by, The device comprises a ground current detection module and a data uploading module connected with each other; The ground current detection module is used for collecting a zero sequence voltage signal of a three-phase high-voltage line of a power distribution network, calculating a zero sequence voltage amplitude according to the zero sequence voltage signal, determining that a ground current fault occurs when the zero sequence voltage amplitude exceeds a preset limit value, and collecting a zero sequence current signal of a fault line; The uploading module comprises a device area, a data processing area and a data transmission area connected with each other; the device area is used for real-time sampling and managing the detection data of the ground current detection module; the data processing area is used for pre-processing the data of the device area; and the data transmission area is used for uploading the data of the data processing area to a cloud server; wherein when the data transmission area uploads data, the number of task bits for uploading data is proportionally divided into two parts according to a proportional division coefficient, one part of the number of task bits is uploaded, and the remaining part of the number of task bits is placed in the next transmission calculation; The device area comprises a real-time control unit and a data management unit connected with each other; the real-time control unit is used for real-time sampling of the detection data of the ground current detection module; and the data management unit is used for compressing and storing the data sampled by the real-time control unit; When the data transmission area determines the calculation time delay of the task, it is specifically used for: Set the proportional division coefficient, the bit length of the task , the data transmission area will upload a part of the task bit number , and the remaining part of the task bit number (1- ) is placed in the next transmission calculation, and the calculation delay of the task is determined according to the following formula: ； In the formula, denotes the computing delay of the task , denotes the time of the uplink transmission task, denotes the time of data processing, denotes the time of downlink receiving the computing result, is the uplink rate of the task , is the downlink rate of the task , denotes the transmission bandwidth, denotes the noise power of the data transmission area, denotes the uplink channel gain between the data transmission area and the cloud server, denotes the downlink channel gain between the data transmission area and the cloud server, denotes the transmission power of the data transmission area, is the transmission power of the cloud server, is the computing frequency of the cloud server.

2. The actively grounded current sensing device capable of fast data upload of claim 1, wherein, When the data processing area pre-processes the data of the device area, it is specifically used for: The zero sequence current signal of the fault line is normalized according to the following formula: ； In the formula, is the result of pre-processing the zero sequence current signal of the fault line, is the zero sequence current value of the fault line sampled for the first time, is the zero sequence current value of the fault line sampled for the nth time, is the preset current base.

3. The actively grounded current sensing device capable of fast data upload of claim 2, wherein, When the data processing area normalizes the zero sequence current signal of the fault line, it is specifically used for: The value of the preset current base is 50A.

4. The actively grounded current sensing device of claim 1, wherein, The data transmission area is also used to determine the calculation time delay of the task, and adjust the proportional division coefficient when the calculation time delay is higher than a preset calculation time delay threshold.

5. The active ground fault current detection device capable of fast data upload of claim 1, wherein, The data transmission area is also used to determine the calculation cost of the task, and adjust the proportional division coefficient when the calculation cost is higher than a preset calculation cost threshold.

6. The actively grounded current sensing device capable of fast data upload of claim 5, wherein, When the data transmission area determines the calculation cost of the task, it is specifically used for: The calculation cost of the task is determined according to the following formula: ； In the formula, represents the computing cost of the task , represents the energy consumption of the task , represents the transmission power of the data transmission area, represents the time of the uplink transmission task, represents the computing delay of the task , is a preset influence coefficient.

7. The active ground fault current detection device capable of fast data upload of any of claims 1-6, wherein, The ground current detection module comprises a sampling unit, a core control unit, a high-voltage stable control unit and a fault judgment unit connected in sequence; the sampling unit is used for collecting a zero sequence voltage signal of a three-phase high-voltage line of a power distribution network; the core control unit is used for calculating a zero sequence voltage amplitude according to the zero sequence voltage signal, and controlling the high-voltage stable control unit to generate a characteristic current signal when the zero sequence voltage amplitude exceeds a preset limit value; The fault judgment unit is used for determining that a ground current fault occurs when the characteristic current signal is detected, and controlling the sampling unit to collect a zero sequence current signal of a fault line.

8. The actively grounded current sensing device capable of fast data upload of claim 7, wherein, The ground current detection module further comprises a fault warning unit connected with the fault judgment unit; The fault warning unit is used for outputting corresponding warning information when a ground current fault occurs.

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