Light emitting diode display device and method of manufacturing the same

Abstract

The application provides a lightning protection power output voltage monitoring system and method, which comprises the following steps: collecting the power voltage between the low-voltage side neutral line and the grounding electrode of the base station in real time through the voltage monitoring device connected in parallel between the low-voltage side neutral line and the grounding electrode of the base station; when the power voltage is greater than the preset early warning threshold, starting the secondary monitoring device to collect the loop current of the loop between the neutral line and the protective ground wire of the base station, and detecting the output voltage anomaly of the lightning protection power supply according to the coordination degree between the loop current and the power voltage; determining the energy accumulation of the lightning protection power supply anomaly in the overvoltage damage stage and the energy discharge amount of the grounding electrode in the overcurrent damage stage through the mutation point; positioning the transient overvoltage fault of the lightning protection power supply based on the energy accumulation and the energy discharge amount, and controlling the jump of the circuit breaker according to the positioning result. By using the scheme of the application, the influence of the conduction discharge of the surge protector on the transient overvoltage fault monitoring during lightning stroke can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of voltage monitoring, and more particularly to a lightning protection power supply output voltage monitoring system and method. BACKGROUND

[0002] The lightning protection power supply is a key device for protecting communication base stations, industrial control systems and the like from lightning strikes and temporary over-voltage (TOV) damage. Through the coordinated work of surge protective devices (SPDs), circuit breakers and grounding systems, it realizes over-voltage limitation, surge current discharge and fault loop disconnection, and is the core link of power system safety protection.

[0003] The voltage monitoring technology of the existing lightning protection power supply relies on a single voltage threshold or current mutation signal for fault judgment. For example, when the voltage is detected to exceed the preset threshold, it is determined as an over-voltage fault and protection is triggered. However, in actual applications, there are obvious differences in voltage fluctuations. When the SPD is not started, abnormal rise of the power supply voltage may cause continuous damage to the equipment insulation. When the SPD normally conducts to discharge energy, the voltage will naturally fluctuate due to the loop conduction. This fluctuation is a manifestation of the normal protection process. The existing technology cannot effectively distinguish the voltage change characteristics in these two scenarios, often misjudges the voltage fluctuation when the SPD normally operates as an over-voltage fault, or lacks recognition of the implicit voltage abnormality when the SPD is not started, resulting in frequent misoperation of the protection system or lag response to potential risks. Therefore, how to avoid the influence of the conduction discharge of the surge protective device on the transient over-voltage fault monitoring during lightning strikes has become a difficult problem in the industry. SUMMARY

[0004] The present application provides a lightning protection power supply output voltage monitoring system and method, which can avoid the influence of the conduction discharge of the surge protective device on the transient over-voltage fault monitoring during lightning strikes.

[0005] In a first aspect, the present application provides a lightning protection power supply output voltage monitoring method, comprising:

[0006] Parallelly connecting a voltage monitoring device between the low-voltage side neutral line and the grounding electrode of the base station, collecting the power supply voltage between the low-voltage side neutral line and the grounding electrode of the base station in real time through the voltage monitoring device, and starting a secondary monitoring device when the power supply voltage is greater than a preset warning threshold;

[0007] Collecting the loop current of the loop between the neutral line and the protective ground wire of the base station through the secondary monitoring device, and performing coordinated response analysis on the loop current and the power supply voltage to obtain the coordination degree under different time delays;

[0008] The abrupt point detection is performed on the output voltage abnormality of the lightning protection power supply according to all the synergies, when the abrupt point is detected, the fault damage process is divided into overvoltage damage and overcurrent damage through the abrupt point, the energy accumulation of the lightning protection power supply abnormality is determined according to the overvoltage damage, and the energy discharge amount of the grounding electrode is determined based on the overcurrent damage;

[0009] The transient overvoltage fault of the lightning protection power supply is located based on the energy accumulation and the energy discharge amount according to the circuit fault tracing algorithm, and the jump of the circuit breaker is controlled according to the location result.

[0010] In some embodiments, the circuit current and the power supply voltage are subjected to synergistic response analysis to obtain synergies under different time delays, which specifically includes:

[0011] A plurality of different time delays are preset;

[0012] One time delay is selected as a selected time delay, the circuit current and the power supply voltage are aligned in delay according to the selected time delay, and an electric sequence group under the selected time delay is obtained;

[0013] The synergy under the selected time delay is determined according to the voltage and the current in the electric sequence group, and the synergies under the remaining time delays are continuously determined.

[0014] In some embodiments, the abrupt point detection is performed on the output voltage abnormality of the lightning protection power supply according to all the synergies, which specifically includes:

[0015] All the synergies are converted into a synergy difference sequence;

[0016] A plurality of jump points are found in the synergy difference sequence through a preset synergy difference threshold;

[0017] At each jump point, the abrupt detection is performed on the power supply voltage and the circuit current, and the jump point meeting the abrupt condition and having the smallest time stamp is taken as the abrupt point.

[0018] In some embodiments, after the abrupt point detection is performed on the output voltage abnormality of the lightning protection power supply according to all the synergies, it further includes:

[0019] If no abrupt point is monitored, the abnormality is recorded as a surge protection device discharge caused by lightning, and no alarm and circuit breaker jump are performed.

[0020] In some embodiments, the fault damage process is divided into overvoltage damage and overcurrent damage through the abrupt point, which specifically includes:

[0021] The fault damage process is divided into a first stage and a second stage through the abrupt point;

[0022] a part of the circuit current interruption in the first stage as an overvoltage damage;

[0023] a part of the continuous discharge current in the second stage as an overcurrent damage.

[0024] In some embodiments, determining the energy accumulation amount of the lightning protection power supply abnormality according to the overvoltage damage specifically comprises:

[0025] extracting an overvoltage sub-sequence of the power supply voltage in the overvoltage damage;

[0026] determining a transient power sequence of the overvoltage sub-sequence;

[0027] integrating the transient power sequence to obtain an energy accumulation value in the overvoltage damage;

[0028] determining the energy accumulation amount of the lightning protection power supply abnormality based on the energy accumulation value and an energy reference value of the same length under normal working conditions.

[0029] In some embodiments, determining the energy discharge amount of the grounding electrode based on the overcurrent damage specifically comprises:

[0030] extracting an overcurrent sub-sequence of the circuit current in the overcurrent damage stage;

[0031] determining a transient discharge power sequence of the overcurrent sub-sequence;

[0032] integrating the transient discharge power sequence to obtain the total energy discharged through the grounding electrode in the overcurrent damage;

[0033] determining the energy discharge amount of the grounding electrode based on the total energy and the energy consumed by the circuit conductor resistance.

[0034] In some embodiments, the voltage monitoring device is a Hall voltage sensor.

[0035] In some embodiments, the secondary monitoring device is a Hall current sensor.

[0036] In a second aspect, the present application provides a lightning protection power supply output voltage monitoring system, comprising:

[0037] a primary monitoring module, configured to, after connecting a voltage monitoring device in parallel between the low-voltage side neutral line and the grounding electrode of the base station, collect the power supply voltage between the low-voltage side neutral line and the grounding electrode of the base station through the voltage monitoring device in real time, and start a secondary monitoring device when the power supply voltage is greater than a preset warning threshold;

[0038] The secondary monitoring module is configured to collect loop current of a loop between a neutral line of the base station and a protective ground wire through the secondary monitoring device, and perform cooperative response analysis on the loop current and the power supply voltage to obtain a cooperation degree under different time delays.

[0039] The secondary monitoring module is further configured to perform mutation point detection on output voltage abnormality of the lightning protection power supply according to all the cooperation degrees, divide a fault damage process into overvoltage damage and overcurrent damage through the mutation point when the mutation point is detected, determine an energy accumulation amount of the lightning protection power supply abnormality according to the overvoltage damage, and determine an energy discharge amount of the grounding electrode based on the overcurrent damage.

[0040] The execution module is configured to perform positioning on the transient overvoltage fault of the lightning protection power supply based on a circuit fault tracing algorithm, in combination with the energy accumulation amount and the energy discharge amount, and control the jump of the circuit breaker according to the positioning result.

[0041] The technical scheme provided by the embodiment disclosed in the application has the following beneficial effects:

[0042] In the lightning protection power supply output voltage monitoring system and method provided in the application, a voltage monitoring device is connected in parallel between a low-voltage side neutral line and a grounding electrode of a base station, the power supply voltage between the low-voltage side neutral line and the grounding electrode of the base station is collected in real time through the voltage monitoring device, the secondary monitoring device is started when the power supply voltage is greater than a preset early warning threshold, loop current of a loop between a neutral line of the base station and a protective ground wire is collected through the secondary monitoring device, and cooperative response analysis is performed on the loop current and the power supply voltage to obtain a cooperation degree under different time delays, mutation point detection is performed on output voltage abnormality of the lightning protection power supply according to all the cooperation degrees, the fault damage process is divided into overvoltage damage and overcurrent damage through the mutation point when the mutation point is detected, an energy accumulation amount of the lightning protection power supply abnormality is determined according to the overvoltage damage, and an energy discharge amount of the grounding electrode is determined based on the overcurrent damage, the transient overvoltage fault of the lightning protection power supply is positioned based on a circuit fault tracing algorithm, in combination with the energy accumulation amount and the energy discharge amount, and the jump of the circuit breaker is controlled according to the positioning result.

[0043] It can be seen that, in the application, through hierarchical response, secondary monitoring is triggered when the voltage is abnormal, and the moment of SPD action (i.e., the mutation point) is identified through the response (i.e., the degree of cooperation) between the voltage between the neutral line on the low-voltage side and the grounding electrode of the base station and the N-PE loop current. If there is no mutation point, it means that the voltage fluctuation at this time is caused by lightning strike. If there is a mutation point, the TOV fault is divided into an overvoltage damage stage and an overcurrent damage stage based on the moment of SPD action. The energy changes in the two different stages of TOV fault are identified, and finally the TOV fault is located through the circuit fault tracing algorithm. In summary, by using the scheme of the application, the influence of the conduction discharge of the surge protection device on the transient overvoltage fault monitoring during lightning strike can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is an analog circuit diagram of a lightning protection power output voltage monitoring method according to some embodiments of the application;

[0045] Figure 2 is an exemplary flowchart of a lightning protection power output voltage monitoring method according to some embodiments of the application;

[0046] Figure 3 is an exemplary flowchart of mutation point detection according to some embodiments of the application;

[0047] Figure 4 is a structural schematic diagram of a lightning protection power output voltage monitoring system according to some embodiments of the application;

[0048] Figure 5 is a structural schematic diagram of a computer device for implementing a lightning protection power output voltage monitoring method according to some embodiments of the application. DETAILED DESCRIPTION

[0049] In order to better understand the technical solutions of the application, the technical solutions of the application will be described in detail below in combination with the drawings in the specification and specific embodiments.

[0050] Reference Figure 1 The figure is an analog circuit diagram of a lightning protection power output voltage monitoring method according to some embodiments of the application, specifically including:

[0051] Lightning protection power supply, for providing electrical energy input;

[0052] Distribution transformer, realizing voltage conversion between high-voltage power grid and low-voltage power consumption side of base station, reducing input high-voltage electrical energy to low-voltage electrical energy suitable for base station equipment, and having electrical energy distribution and electrical isolation functions;

[0053] Low-voltage neutral point grounding, stably connecting the neutral line and the ground to stabilize the neutral line potential;

[0054] Grounding electrode of base station, a physical device for providing direct grounding for the protective earth of base station equipment, used for discharging fault current and suppressing abnormal lifting of ground potential;

[0055] Fault point, the position where abnormality occurs in lightning protection power supply power transmission.

[0056] Reference Figure 2 The figure is an exemplary flow chart of a lightning protection power supply output voltage monitoring method according to some embodiments of the present application, which mainly includes the following steps:

[0057] In step 101, a voltage monitoring device is connected in parallel between the low-voltage side neutral line and the grounding electrode of the base station, and the power supply voltage between the low-voltage side neutral line and the grounding electrode of the base station is collected in real time through the voltage monitoring device, and when the power supply voltage is greater than a preset warning threshold, a secondary monitoring device is started.

[0058] When implemented, the voltage monitoring device connected in parallel between the low-voltage side neutral line and the grounding electrode of the base station can be implemented in the following manner, that is, a Hall voltage sensor with a range covering at least 0~2000V and a sampling rate not less than 1kHz is selected, and its input end is connected to the grounding bolt of the low-voltage side neutral line (i.e. Figure 1 low-voltage neutral point grounding) and the grounding electrode of the base station (i.e. Figure 1 base station PE grounding electrode) through insulated wires respectively, and the output end of the sensor is connected to the analog input interface of the data acquisition module through a shielded cable.

[0059] It should be noted that the voltage monitoring device in the present application is a Hall voltage sensor with a range covering at least 0~2000V and a sampling rate not less than 1kHz.

[0060] When implemented, the power supply voltage between the low-voltage side neutral line and the grounding electrode of the base station collected in real time through the voltage monitoring device can be implemented in the following manner, that is, first, the parameters of the voltage monitoring device are initialized through the data acquisition module, that is, the sampling frequency of the voltage monitoring device is set to 1kHz, and the range is set to 0~2000V, then the continuous sampling mode of the voltage monitoring device is started, and the voltage value is collected in real time, and the time sequence composed of all the collected voltage values is taken as the power supply voltage between the low-voltage side neutral line and the grounding electrode of the base station.

[0061] It should be noted that the power supply voltage in the present application refers to the real-time potential difference between the low-voltage side neutral line and the grounding electrode of the base station in the lightning protection power supply system.

[0062] In addition, it should be noted that the early warning threshold in the present application can be 1.5 times the potential difference between the neutral line and the base station grounding electrode in the normal working condition of the lightning protection power supply system. In other embodiments, the early warning threshold can also be set to other values, which are not limited here.

[0063] In step 102, the loop current of the loop between the neutral line and the protective ground wire of the base station is collected by the secondary monitoring device, and the loop current and the power supply voltage are analyzed in cooperation to obtain the cooperation degree under different time delays.

[0064] It should be noted that the secondary monitoring device in the present application is a Hall current sensor, and the range of the Hall current sensor covers at least 0-100A, and the sampling rate is not less than 1kHz.

[0065] In specific implementation, the loop current of the loop between the neutral line and the protective ground wire of the base station collected by the secondary monitoring device can be realized in the following manner, that is, the through core coil of the secondary monitoring device is sleeved on the wire of the loop (Neutral to Protective Earth, N-PE loop) between the neutral line and the protective ground wire, the output end is connected to another analog quantity input interface of the data acquisition module through a shielded cable, the range of the secondary monitoring device is set to 0-100A and the sampling rate is 1kHz during initialization, then the continuous sampling mode of the secondary monitoring device is started, the current value is collected in real time, and the time sequence composed of all the collected current values is taken as the loop current of the loop between the neutral line and the protective ground wire of the base station.

[0066] It should be noted that the loop current in the present application refers to the real-time current flowing in the loop (N-PE loop) composed of the neutral line and the protective ground wire of the base station.

[0067] In some embodiments, the loop current and the power supply voltage are analyzed in cooperation to obtain the cooperation degree under different time delays, which can be realized in the following steps:

[0068] A plurality of different time delays are preset;

[0069] One time delay is selected as a selected time delay, the loop current and the power supply voltage are aligned in delay according to the selected time delay, and an electric sequence group under the selected time delay is obtained;

[0070] The cooperation degree under the selected time delay is determined according to the voltage and current in the electric sequence group, and the cooperation degrees under the remaining time delays are continuously determined.

[0071] It should be noted that the time delay in the present application is to simulate the physical phenomena such as the lag of analog circuit signal transmission, the time difference of fault propagation, and the time offset between the preset power supply voltage and the loop current. The time offset is usually set according to the typical time difference range of the transient fault process. For example, if the common transient fault time range is within 50 ms, the time delay value range is all the integers within 0-50 ms.

[0072] In a specific implementation, the loop current and the power supply voltage are delayed and aligned according to the selected time delay to obtain the electric sequence group under the selected time delay. The implementation can be performed in the following manner: in the transient overvoltage fault, the current change lags behind the voltage change, that is, the loop current is delayed by x, where x is the selected time delay. Then, the loop current after the delay of x and the power supply voltage are taken as the electric sequence group under the selected time delay. For example, the loop current is f(t), the power supply voltage is h(t), and the selected time delay is x (unit: ms, and the sampling frequencies of the loop current and the power supply voltage are both 1 kHz). The set composed of f(t+x) and h(t) is taken as the electric sequence group under the selected time delay, where t is the time variable, x is the selected time delay, and f(t+x) is the loop current after the time delay of x.

[0073] It should be noted that the electric sequence group in the present application refers to a group of electric data sequences composed of the loop current after the delay of the selected time and the power supply voltage.

[0074] In a specific implementation, the determination of the synergy degree under the selected time delay according to the voltage and the current in the electric sequence group can be performed in the following manner: the cross-correlation coefficient between the loop current and the power supply voltage in the electric sequence group is calculated by using the Pearson correlation coefficient in the prior art, and the obtained cross-correlation coefficient is taken as the synergy degree under the selected time delay.

[0075] It should be noted that the synergy degree in the present application is a parameter value for measuring the degree of linear synergistic response between the voltage and the current in the electric sequence group under the selected time delay.

[0076] In step 103, the output voltage anomaly of the lightning protection power supply is detected for a mutation point according to all the synergy degrees. When the mutation point is detected, the fault damage process is divided into an overvoltage damage and an overcurrent damage by the mutation point. The energy accumulation amount of the lightning protection power supply anomaly is determined according to the overvoltage damage, and the energy discharge amount of the grounding electrode is determined based on the overcurrent damage.

[0077] In some embodiments, with reference to Figure 3 The figure is an exemplary flow chart of mutation point detection according to some embodiments of the present application. The detection of the output voltage anomaly of the lightning protection power supply for a mutation point according to all the synergy degrees in the present application can be implemented in the following steps:

[0078] In step 1031, all the synergies are converted into a sequence of synergy difference;

[0079] In step 1032, a plurality of jump points are found in the sequence of synergy difference by a preset synergy difference threshold;

[0080] In step 1033, at each jump point, mutation detection is performed on the power supply voltage and loop current, and the jump point that meets the mutation condition and has the smallest timestamp is taken as the mutation point.

[0081] In specific implementation, converting all the synergies into a sequence of synergy difference can be implemented in the following manner, i.e., first, all the synergies are arranged in order from small to large according to the size of time delay, then, first-order difference is performed on the arranged sequence, and finally, the result of the difference is taken as the sequence of synergy difference.

[0082] It should be noted that the sequence of synergy difference in the present application is a sequence composed of the difference between the synergies of two adjacent time points.

[0083] In specific implementation, finding a plurality of jump points in the sequence of synergy difference by a preset synergy difference threshold can be implemented in the following manner, i.e., all the values in the sequence of synergy difference are compared with the preset synergy difference threshold in turn, the positions of all the values greater than the synergy difference threshold are recorded, for example, the 1st, 4th and 5th values in the sequence of synergy difference are greater than the synergy difference threshold, then, the value at the corresponding position in the power supply voltage is screened out according to the recorded positions, for example, 1, 4 and 5 are recorded, then the 1st, 4th and 5th voltage values in the power supply voltage are screened out, and then all the screened voltage values are taken as the jump points.

[0084] It should be noted that the jump point in the present application refers to the time point at which the voltage and current appear stepwise jump in the transient overvoltage fault.

[0085] In a specific implementation, at each jump point, the sudden change of the power supply voltage and the loop current is detected, and the jump point that meets the sudden change condition and has the smallest timestamp is taken as the sudden change point. The following method can be used to achieve this: a jump point is selected as the selected jump point. First, 10 ms of data before and after the selected jump point is extracted from the power supply voltage as a voltage sub-sequence, and whether the change rate of the voltage sub-sequence exceeds the difference between the SPD cutoff voltage and the voltage in the normal working condition is calculated. If it exceeds, it is recorded as a voltage sudden change. The SPD cutoff voltage can be directly obtained by querying the device parameter manual of the SPD, and the voltage in the normal working condition can be determined by continuously sampling for more than 1 hour and then averaging the voltage monitored by the voltage monitoring device when the base station is stably running. Second, 10 ms of data before and after the selected jump point is extracted from the loop current as a current sub-sequence, and whether the change rate of the current sub-sequence exceeds the preset current sudden change threshold is calculated. If it exceeds, it is recorded as a current sudden change. The current sudden change threshold can be preset by the device parameter manual of the SPD. For example, the device parameter manual of the SPD records a 10 kA rated current capacity and a 2 ms action time, and the current sudden change threshold is set to 10 / 2=5 kA / ms. Finally, for the jump point that meets the voltage sudden change and the current sudden change, the timestamp is recorded, and the jump point corresponding to the smallest timestamp among all the jump points that meet the condition is taken as the sudden change point.

[0086] It should be noted that the sudden change point in the present application refers to the time when the SPD switch jumps.

[0087] In some embodiments, after the sudden change point detection of the output voltage anomaly of the lightning protection power supply according to all the coordination degrees, the following is further included:

[0088] If no sudden change point is monitored, the current anomaly is recorded as a surge protection device discharge caused by lightning strike, and no alarm and breaker jump are performed.

[0089] In some embodiments, the following steps can be used to divide the fault damage process into overvoltage damage and overcurrent damage through the sudden change point:

[0090] The fault damage process is divided into a first stage and a second stage through the sudden change point.

[0091] The part of the loop current circuit breaking in the first stage is taken as overvoltage damage.

[0092] The part of the continuous discharge current in the second stage is taken as overcurrent damage.

[0093] In a specific implementation, the fault damage process can be divided into a first stage and a second stage through the sudden change point by using the following method: the period from the time point when the secondary monitoring device is started to the time point before the sudden change point is taken as the first stage, and the period after the sudden change point is taken as the second stage.

[0094] In a specific implementation, the part of the loop current in the first stage that is disconnected as overvoltage damage can be achieved in the following way: the time sequence of the loop current in the first stage is intercepted, a disconnection state judgment threshold (e.g., ≤0.5 A) is set, time periods in which the current value is continuously below the threshold are screened out, and the time periods are taken as the time periods of overvoltage damage. In this stage, because the N-PE loop does not form an effective discharge channel, overvoltage energy is mainly borne by the insulation medium of the electrical equipment to cause damage. Specifically, in the time period in which the current value is continuously below the threshold, the medium-voltage fault overvoltage has been transmitted to the low-voltage side, but the amplitude is lower than the SPD operating voltage, the SPD is not conducting, the N-PE loop is in a disconnected or high-resistance state, and an effective discharge channel cannot be formed. In this state, overvoltage energy cannot be discharged and is mainly applied to the insulation medium of the electrical equipment, which bears the energy under the continuous high voltage and causes cumulative damage (i.e., overvoltage damage). The continuous current value below the threshold is a direct and reliable criterion for the non-action of the SPD and the non-establishment of the discharge channel.

[0095] It should be noted that the overvoltage damage in this application refers to the fault stage in which overvoltage energy is mainly borne by the equipment insulation to cause damage in the lightning protection power supply system.

[0096] In a specific implementation, the part of the continuous discharge current in the second stage as overcurrent damage can be achieved in the following way: the time sequence of the loop current in the second stage is intercepted, a conduction state judgment threshold (e.g., ≥5 A) is set, time periods in which the current value is continuously above the threshold and the duration exceeds 50 ms are screened out, and the time periods are taken as overcurrent damage. In this stage, because the N-PE loop forms an effective discharge channel, overcurrent energy produces thermal and electric power effects through the loop impedance to cause damage.

[0097] It should be noted that the overcurrent damage in this application refers to the fault stage in which overcurrent energy produces thermal and electric power effects through the loop impedance to cause damage in the lightning protection power supply system.

[0098] In some embodiments, the energy accumulation amount of the lightning protection power supply anomaly determined according to the overvoltage damage can be achieved in the following steps:

[0099] extracting an overvoltage subsequence of the power supply voltage in the overvoltage damage;

[0100] determining a transient power sequence of the overvoltage subsequence;

[0101] integrating the transient power sequence to obtain an energy accumulation value in the overvoltage damage;

[0102] Determine the energy accumulation amount of the lightning protection power supply abnormality based on the energy accumulation value and an energy reference value under the same length of time under normal working conditions.

[0103] In a specific implementation, the overvoltage subsequence of the power supply voltage in the overvoltage damage can be obtained in the following manner: a subsequence of the power supply voltage in the time period of the overvoltage damage is taken as the overvoltage subsequence.

[0104] It should be noted that the overvoltage subsequence in the present application refers to a subsequence of the power supply voltage in the overvoltage damage.

[0105] In a specific implementation, the instantaneous power sequence of the overvoltage subsequence can be obtained in the following manner: each voltage value in the overvoltage subsequence is multiplied by the current value at the corresponding time in the loop current, and all the products obtained are taken as the instantaneous power of each voltage value, and then, all the instantaneous powers are arranged in chronological order, and the sequence obtained is taken as the instantaneous power sequence of the overvoltage subsequence.

[0106] It should be noted that the instantaneous power sequence in the present application refers to a sequence of instantaneous powers at each time in the overvoltage damage.

[0107] In a specific implementation, the integral operation on the instantaneous power sequence to obtain the energy accumulation value in the overvoltage damage can be implemented in the following manner: the discrete integral operation is performed on the instantaneous power sequence, where the time interval is the same as the sampling interval of the voltage monitoring device, the integral range is the entire overvoltage damage, and the result of the discrete integral operation is taken as the energy accumulation value in the overvoltage damage.

[0108] It should be noted that the energy accumulation value in the present application refers to the total energy generated in the overvoltage damage.

[0109] In a specific implementation, the determination of the energy accumulation amount of the lightning protection power supply abnormality based on the energy accumulation value and an energy reference value under the same length of time under normal working conditions can be implemented in the following manner: first, the energy data of the same duration as the overvoltage damage phase of the base station in normal operation is retrieved from the historical database, the average energy value under the duration is calculated as the energy reference value, the energy accumulation value of the overvoltage damage phase is subtracted from the energy reference value, and the difference obtained is the energy accumulation amount of the lightning protection power supply abnormality.

[0110] It should be noted that the energy accumulation amount in the present application is a parameter value for measuring the additional energy accumulation amount of the lightning protection power supply due to abnormal overvoltage.

[0111] In some embodiments, the determination of the energy discharge amount of the grounding electrode based on the overcurrent damage can be implemented in the following steps:

[0112] extracting an overcurrent sub-sequence of the loop current in the overcurrent damage stage;

[0113] determining a transient discharge power sequence of the overcurrent sub-sequence;

[0114] integrating the transient discharge power sequence to obtain total energy discharged through the grounding electrode in the overcurrent damage;

[0115] determining the energy discharge amount of the grounding electrode based on the total energy and energy consumed by the loop conductor resistance.

[0116] In a specific implementation, the overcurrent sub-sequence of the loop current in the overcurrent damage stage can be implemented in the following manner: a sub-sequence of the loop current in a time period of the overcurrent damage is taken as the overcurrent sub-sequence.

[0117] It should be noted that the overcurrent sub-sequence in the present application refers to a sub-sequence of the loop current in the overcurrent damage.

[0118] In a specific implementation, the transient discharge power sequence of the overcurrent sub-sequence can be implemented in the following manner: each current value in the overcurrent sub-sequence is multiplied by a voltage value of the grounding electrode of the base station PE at a corresponding time point, wherein the voltage value of the grounding electrode of the base station PE can be collected by a voltage sensor connected in parallel between the grounding electrode of the base station PE and a reference grounding electrode far away from the base station, and all products obtained are taken as transient discharge powers of each current value, respectively, then, all transient discharge powers are arranged in time sequence, and a sequence obtained is taken as the transient discharge power sequence of the overcurrent sub-sequence.

[0119] It should be noted that the transient discharge power sequence in the present application refers to a sequence composed of transient discharge powers at each time point in the overcurrent damage.

[0120] In a specific implementation, the total energy discharged through the grounding electrode in the overcurrent damage can be implemented in the following manner: discrete integration operation is performed on the transient discharge power sequence, wherein a time interval is the same as a sampling interval of the secondary monitoring device, an integration range is the entire overcurrent damage, and a result of the discrete integration operation is taken as the total energy discharged through the grounding electrode in the overcurrent damage.

[0121] It should be noted that the total energy in the present application refers to a sum of energies discharged through the grounding electrode in the overcurrent damage.

[0122] In specific implementation, determining the energy discharge amount of the grounding electrode based on the total energy and the energy consumed by the loop conductor resistance can be achieved in the following manner: first, according to Joule's law, the energy consumed by the loop conductor resistance is calculated through the nominal resistance value of the N-PE loop and the overcurrent subsequence, and then the difference between the total energy and the energy consumed by the loop conductor resistance is subtracted as the energy discharge amount of the grounding electrode.

[0123] It should be noted that the energy discharge amount in this application is a parameter value used to measure the amount of surge energy discharged by the grounding electrode under a fault state.

[0124] In step 104, based on a circuit fault tracing algorithm, the transient overvoltage fault of the lightning protection power supply is located in combination with the energy accumulation amount and the energy discharge amount, and the tripping of the circuit breaker is controlled according to the location result.

[0125] In some embodiments, based on a circuit fault tracing algorithm, the transient overvoltage fault of the lightning protection power supply is located by combining the energy accumulation amount and the energy discharge amount. The following steps can be used:

[0126] Pre-trained circuit fault tracing algorithm;

[0127] The energy accumulation amount and the energy discharge amount are input into the circuit fault tracing algorithm to obtain the fault coordinates of the transient overvoltage of the lightning protection power supply.

[0128] In specific implementation, the pre-trained circuit fault tracing algorithm can be implemented in the following way: select the circuit fault tracing algorithm based on Bayesian network, first according to Figure 1 A topological structure model including the core components of the lightning protection power supply (such as SPD, circuit breaker, transformer, and grounding electrode) was constructed. The impedance parameters and energy tolerance thresholds of each component were used as prior nodes. Historical transient overvoltage fault cases (including energy accumulation, energy discharge, and corresponding actual fault location labels) were collected from the historical database. The Bayesian network was trained and the conditional probability distribution between network nodes was optimized using the maximum likelihood estimation method. This enabled the algorithm to output the posterior probability of failure of each component based on the input energy accumulation and energy discharge. 5-fold cross-validation was used during the training process. When the algorithm's fault location accuracy on the validation set stably exceeded 90%, the training was stopped and the model parameters were saved.

[0129] In a specific implementation, the energy accumulation amount and the energy discharge amount are input into the circuit fault tracing algorithm to obtain the fault coordinates of the transient overvoltage of the lightning protection power supply. The following method can be used to achieve this: first, quantize the energy accumulation amount into discrete values according to a preset interval (for example, 0-100 J is level 1, 101-500 J is level 2, and so on), and quantize the energy discharge amount into corresponding discrete levels. Then, input the quantized parameters into the pre-trained Bayesian network. According to the conditional probability distribution of each node in the network, the algorithm calculates the posterior probability of the occurrence of transient overvoltage faults of each core component (SPD, input end fuse, ground terminal, etc.) in the lightning protection power supply topology. The component with the highest posterior probability is selected as the fault source. The physical coordinates of the component in the circuit topology are obtained by querying the component in the circuit topology, and the physical coordinates are output as the fault coordinates of the transient overvoltage.

[0130] In a specific implementation, the following method can be used to control the switching of the circuit breaker according to the positioning result: first, obtain the circuit loop pointed to by the fault coordinates, and control the system to send a trip signal to the circuit breaker corresponding to the circuit loop, so that the circuit breaker is immediately disconnected to cut off the fault.

[0131] In addition, another aspect of the present application provides a lightning protection power supply output voltage monitoring system in some embodiments. Referring to Figure 4 The figure is a structural schematic diagram of a lightning protection power supply output voltage monitoring system according to some embodiments of the present application. The lightning protection power supply output voltage monitoring system 400 includes a primary monitoring module 401, a secondary monitoring module 402, and an execution module 403, which are described as follows:

[0132] The primary monitoring module 401 is mainly used to connect a voltage monitoring device in parallel between the low-voltage side neutral line and the grounding pole of the base station in the present application. The voltage monitoring device is used to collect the power supply voltage between the low-voltage side neutral line and the grounding pole of the base station in real time. When the power supply voltage is greater than a preset warning threshold, the secondary monitoring device is started.

[0133] The secondary monitoring module 402 is mainly used to collect the loop current of the loop between the neutral line and the protective ground wire of the base station through the secondary monitoring device in the present application. The loop current and the power supply voltage are analyzed in coordination to obtain the coordination degree under different time delays.

[0134] It should be noted that the secondary monitoring module 402 is also used to detect the mutation point of the output voltage anomaly of the lightning protection power supply according to all coordination degrees. When the mutation point is detected, the fault damage process is divided into overvoltage damage and overcurrent damage through the mutation point. The energy accumulation amount of the lightning protection power supply anomaly is determined according to the overvoltage damage, and the energy discharge amount of the grounding pole is determined based on the overcurrent damage.

[0135] The execution module 403 is mainly used for locating the transient overvoltage fault of the lightning protection power supply based on the circuit fault tracing algorithm, combining the energy accumulation amount and the energy discharge amount, and controlling the trip of the circuit breaker according to the locating result.

[0136] In addition, the application further provides a computer device, which comprises a memory and a processor, the memory stores code, and the processor is configured to acquire the code and execute the lightning protection power supply output voltage monitoring method.

[0137] In some embodiments, with reference to Figure 5 The figure is a structural schematic diagram of a computer device for implementing the lightning protection power supply output voltage monitoring method according to some embodiments of the application. The lightning protection power supply output voltage monitoring method in the above embodiments can be implemented by the computer device shown in the figure, which comprises at least one processor 501, a communication bus 502, a memory 503 and at least one communication interface 504. Figure 5 The processor 501 can be a general central processing unit (CPU) or an application-specific integrated circuit (ASIC).

[0138] The processor 501 can be a general central processing unit (CPU) or an application-specific integrated circuit (ASIC).

[0139] The communication bus 502 can be used to transmit information between the above components.

[0140] The memory 503 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magnetic disk or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this. The memory 503 can exist independently and be connected to the processor 501 through the communication bus 502. The memory 503 can also be integrated with the processor 501.

[0141] The memory 503 is configured to store a program code for implementing the scheme of the present application, and the processor 501 is configured to execute the program code stored in the memory 503. The program code can include one or more software modules. The lightning protection power supply output voltage monitoring method in the above-described embodiments can be implemented by one or more software modules in the program code of the processor 501 and the memory 503.

[0142] The communication interface 504 is configured to communicate with other devices or communication networks, such as an Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc., using any transceiver-like device.

[0143] In a specific implementation, as an example, the computer device can include a plurality of processors, each of which can be a single-CPU processor or a multi-CPU processor. The processor herein can refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0144] The computer device described above can be a general-purpose computer device or a special-purpose computer device. In a specific implementation, the computer device can be a desktop computer, a laptop computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device, or an embedded device. The embodiments of the present application do not limit the type of computer device.

[0145] In addition, the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the lightning protection power supply output voltage monitoring method described above.

[0146] In summary, in the lightning protection power output voltage monitoring system and method disclosed in the embodiments of the present application, first, a voltage monitoring device is connected in parallel between the low-voltage side neutral line and the grounding electrode of the base station, the power supply voltage between the low-voltage side neutral line and the grounding electrode of the base station is collected in real time through the voltage monitoring device, when the power supply voltage is greater than a preset early warning threshold, a secondary monitoring device is started; the loop current of the loop between the neutral line and the protective ground wire of the base station is collected through the secondary monitoring device, and the loop current and the power supply voltage are analyzed in a cooperative response, to obtain the cooperation degree under different time delays; the output voltage anomaly of the lightning protection power supply is detected by the mutation point according to all the cooperation degrees, when the mutation point is detected, the fault damage process is divided into overvoltage damage and overcurrent damage through the mutation point, the energy accumulation of the lightning protection power supply anomaly is determined according to the overvoltage damage, and the energy discharge amount of the grounding electrode is determined based on the overcurrent damage; the transient overvoltage fault of the lightning protection power supply is located based on the circuit fault tracing algorithm, combined with the energy accumulation and the energy discharge amount, and the jump of the circuit breaker is controlled according to the location result.

[0147] As can be seen, in the present application, through hierarchical response, secondary monitoring is triggered when the voltage is abnormal, the moment of SPD action (i.e. the mutation point) is identified through the response (i.e. the cooperation degree) between the voltage between the low-voltage side neutral line and the grounding electrode of the base station and the N-PE loop current, if there is no mutation point, it means that this time is the voltage fluctuation caused by lightning strike, if there is a mutation point, the TOV fault is divided into an overvoltage damage stage and an overcurrent damage stage based on the moment of SPD action, the energy changes in the two different stages of TOV fault are identified, and finally the TOV fault is located through the circuit fault tracing algorithm. In summary, by using the scheme of the present application, the influence of the conduction discharge of the surge protection device on the transient overvoltage fault monitoring when lightning strikes can be avoided.

[0148] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0149] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A lightning protection power supply output voltage monitoring method, characterized by, The application relates to a lightning protection power supply fault detection method and device. A voltage monitoring device is connected in parallel between a low-voltage neutral line and a grounding electrode of a base station, real-time acquisition of power supply voltage between the low-voltage neutral line and the grounding electrode of the base station is realized through the voltage monitoring device, and when the power supply voltage is greater than a preset early warning threshold, a secondary monitoring device is started; A loop current of a loop between a neutral line and a protective ground wire of the base station is acquired through the secondary monitoring device, and cooperative response analysis of the loop current and the power supply voltage is carried out, thereby obtaining a cooperative degree under different time delays; A mutation point detection of output voltage abnormality of the lightning protection power supply is carried out according to all the cooperative degrees, when the mutation point is detected, a fault damage process is divided into overvoltage damage and overcurrent damage through the mutation point, an energy accumulation amount of the lightning protection power supply abnormality is determined according to the overvoltage damage, and an energy discharge amount of the grounding electrode is determined based on the overcurrent damage; Based on a circuit fault tracing algorithm, the energy accumulation amount and the energy discharge amount are combined to locate a transient overvoltage fault of the lightning protection power supply, and a trip of a circuit breaker is controlled according to a locating result.

2. The method of claim 1, wherein, The cooperative response analysis of the loop current and the power supply voltage to obtain the cooperative degree under different time delays specifically includes: A plurality of different time delays are preset; A time delay is selected as a selected time delay, the loop current and the power supply voltage are delayed and aligned according to the selected time delay, and an electric sequence group under the selected time delay is obtained; The cooperative degree under the selected time delay is determined according to the voltage and the current in the electric sequence group, and the cooperative degrees under the remaining time delays are continuously determined.

3. The method of claim 1, wherein, The mutation point detection of the output voltage abnormality of the lightning protection power supply according to all the cooperative degrees specifically includes: All the cooperative degrees are converted into a cooperative degree difference sequence; A plurality of jump points are found in the cooperative degree difference sequence through a preset cooperative difference threshold; At each jump point, a mutation detection of the power supply voltage and the loop current is carried out, and a jump point meeting a mutation condition and having the smallest time stamp is taken as the mutation point.

4. The method of claim 1, wherein, After the mutation point detection of the output voltage abnormality of the lightning protection power supply according to all the cooperative degrees, the method further includes: If no mutation point is monitored, the abnormality is recorded as a surge protector discharge caused by lightning, and no alarm and circuit breaker trip are carried out.

5. The method of claim 1, wherein, The fault damage process is divided into overvoltage damage and overcurrent damage through the mutation point specifically includes: The fault damage process is divided into a first stage and a second stage through the mutation point; A part of the loop current circuit breaking in the first stage is taken as the overvoltage damage; A part of the continuous discharge current in the second stage is taken as the overcurrent damage.

6. The method of claim 1, wherein, The determination of the energy accumulation amount of the lightning protection power supply abnormality according to the overvoltage damage specifically includes: An overvoltage subsequence of the power supply voltage in the overvoltage damage is extracted; An instantaneous power sequence of the overvoltage subsequence is determined; An integral operation is carried out on the instantaneous power sequence, thereby obtaining an energy accumulation value in the overvoltage damage; Based on the energy accumulation value and an energy reference value under the same length in a normal working condition, an energy accumulation amount of the lightning protection power supply abnormality is determined.

7. The method of claim 1, wherein, The determination of the energy discharge amount of the grounding electrode based on the overcurrent damage specifically includes: An overcurrent subsequence of the loop current in the overcurrent damage stage is extracted; determining a transient discharge power sequence of the overcurrent subsequence; integrating the transient discharge power sequence to obtain total energy discharged through the grounding electrode in the overcurrent damage; determining the energy discharge amount of the grounding electrode based on the total energy and energy consumed by the loop conductor resistance.

8. The method of claim 1, wherein, The voltage monitoring device is a Hall voltage sensor.

9. The method of claim 1, wherein, The secondary monitoring device is a Hall current sensor.

10. A lightning protection power supply output voltage monitoring system characterized by, The method comprises: a primary monitoring module, configured to, after connecting a voltage monitoring device in parallel between the low-voltage side neutral line and the grounding electrode of the base station, collect the power supply voltage between the low-voltage side neutral line and the grounding electrode of the base station in real time through the voltage monitoring device, and when the power supply voltage is greater than a preset early warning threshold, start a secondary monitoring device; a secondary monitoring module, configured to collect the loop current of the loop between the neutral line and the protective ground wire of the base station through the secondary monitoring device, and perform cooperative response analysis on the loop current and the power supply voltage to obtain the degree of cooperation under different time delays; The secondary monitoring module is further configured to detect the mutation point of the output voltage anomaly of the lightning protection power supply according to all the degrees of cooperation, and when the mutation point is detected, divide the fault damage process into overvoltage damage and overcurrent damage through the mutation point, determine the energy accumulation amount of the lightning protection power supply anomaly according to the overvoltage damage, and determine the energy discharge amount of the grounding electrode based on the overcurrent damage; an execution module, configured to, based on a circuit fault tracing algorithm, combine the energy accumulation amount and the energy discharge amount to locate the transient overvoltage fault of the lightning protection power supply, and control the jump of the circuit breaker according to the positioning result.

Images