A GIS external partial discharge identification method, device, equipment and medium

Abstract

The application discloses a GIS external partial discharge identification method, device, equipment and medium, and is used for solving the technical problem that the existing GIS discharge identification method cannot distinguish internal discharge and external discharge, and when the GIS external partial discharge signal is received by the GIS ultra-high frequency sensor, the false alarm of the online monitoring system is caused. The application comprises the following steps: when detecting a partial discharge phenomenon, calculating the pulse arrival time of a pulse signal detected by a plurality of ultra-high frequency sensors; determining a partial discharge position in the GIS according to the pulse arrival time; generating a transmission path of the pulse signal between the partial discharge position and the ultra-high frequency sensor; the transmission path comprises a plurality of GIS components; acquiring the attenuation coefficient of the GIS component, calculating the transmission attenuation of the transmission path according to the attenuation coefficient; and judging whether the partial discharge phenomenon is GIS external partial discharge according to the transmission attenuation.

Description

Technical Field

[0001] This invention relates to the field of GIS technology, and in particular to a method, apparatus, device and medium for identifying external partial discharge in GIS. Background Technology

[0002] Gas-insulated switchgear (GIS) is a key component of urban power grids, playing a crucial role in ensuring power supply reliability and thus receiving significant attention from power grid companies. Potential insulation defects may be left over from the manufacturing and construction of GIS equipment. With increasing operating years, these defects can develop into dangerous discharge paths, potentially leading to GIS breakdown faults, accidents, economic losses, and personal injury.

[0003] Internal insulation defects in GIS (Gas Insulation System) are often accompanied by partial discharge phenomena. By using ultra-high frequency partial discharge detection technology and a partial discharge live detection device, internal insulation defects can be detected during normal operation of the GIS. This allows for real-time assessment of the health status of the GIS equipment without affecting power grid operation, enabling timely detection of potential problems and preventing equipment failure.

[0004] Digital twins are simulation processes that fully utilize data such as physical models, sensor updates, and operational history to integrate multiple disciplines, physical quantities, scales, and probabilities, and complete mapping in virtual space to reflect the entire life cycle of the corresponding physical equipment.

[0005] Digital twins are a technology that fully leverages the advantages of multiple disciplines such as models, data, and intelligent integration. They have the ability to map the entire lifecycle status of GIS, providing strong analytical and decision support for predictive maintenance of GIS. They can also trace the causes of power equipment failures in detail and continuously improve the design model in the information world by using interactive feedback information, thus greatly optimizing the overall design of GIS. Therefore, conducting research on GIS status diagnosis and assessment technology based on digital twins has very important engineering and practical significance.

[0006] Existing technologies can use ultra-high frequency (UHF) methods for online monitoring of partial discharge in GIS equipment, accurately determining the presence or absence of discharge, but cannot reliably distinguish whether the discharge originates from within the GIS. When external partial discharge signals are received by the GIS UHF sensor, it can cause false alarms in the online monitoring system. Summary of the Invention

[0007] This invention provides a method, apparatus, device, and medium for identifying external partial discharge in GIS, which solves the technical problem that existing GIS discharge identification methods cannot distinguish between internal and external discharges, leading to false alarms in the online monitoring system when external partial discharge signals are received by the GIS UHF sensor.

[0008] This invention provides a method for identifying external partial discharge in GIS, comprising:

[0009] When partial discharge is detected, the arrival time of the pulse signals detected by several ultra-high frequency sensors is calculated.

[0010] The location of the partial discharge is determined in the GIS based on the arrival time of the pulse.

[0011] A transmission path for the pulse signal is generated between the partial discharge location and the ultra-high frequency sensor; the transmission path includes several GIS components;

[0012] Obtain the attenuation coefficient of the GIS component, and calculate the transmission attenuation of the transmission path based on the attenuation coefficient;

[0013] The transmission attenuation is used to determine whether the partial discharge phenomenon is an external partial discharge of the GIS.

[0014] Optionally, the step of calculating the pulse arrival times of the pulse signals detected by several ultra-high frequency sensors when partial discharge is detected includes:

[0015] When partial discharge is detected, the first moment when the amplitude of the pulse signal detected by each ultra-high frequency sensor reaches the preset threshold is obtained;

[0016] Obtain the second moment when the pulse signal detected by each ultra-high frequency sensor reaches its first peak value;

[0017] The midpoint between the first time point and the second time point is calculated as the pulse arrival time when the ultra-high frequency sensor detects the pulse signal.

[0018] Optionally, the step of determining the partial discharge location in the GIS based on the pulse arrival time includes:

[0019] Calculate the time difference between the arrival times of any two pulses;

[0020] The location of partial discharge is determined in the GIS based on the time difference.

[0021] Optionally, the step of obtaining the attenuation coefficient of the GIS component and calculating the transmission attenuation of the transmission path based on the attenuation coefficient includes:

[0022] Obtain the length parameters and attenuation coefficient of the GIS component;

[0023] The transmission attenuation of the GIS component is calculated based on the length parameter and the attenuation coefficient.

[0024] The transmission attenuation of the transmission path is obtained by summing the transmission attenuation of all GIS components along the transmission path.

[0025] Optionally, the step of determining whether the partial discharge phenomenon is an external partial discharge of the GIS based on the transmission attenuation includes:

[0026] Calculate the difference in transmission attenuation between every two UHF sensors;

[0027] Obtain the signal amplitude of the pulse signals received by each ultra-high frequency sensor;

[0028] By combining each ultra-high frequency sensor in pairs, several sensor combinations are obtained;

[0029] Calculate the first difference between the transmission attenuation of the UHF sensors in each sensor combination;

[0030] Calculate the second difference between the signal amplitudes of the ultra-high frequency sensors in each sensor combination;

[0031] Calculate the third difference between the second difference and the first difference of the UHF sensors in each sensor combination;

[0032] Determine whether there is a third difference greater than a preset threshold in all the sensor combinations;

[0033] If present, the partial discharge phenomenon is determined to be external partial discharge of the GIS.

[0034] The present invention also provides a GIS external partial discharge identification device, comprising:

[0035] The pulse arrival time calculation module is used to calculate the pulse arrival time of the pulse signals detected by several ultra-high frequency sensors when partial discharge is detected.

[0036] A partial discharge location determination module is used to determine the partial discharge location in the GIS based on the arrival time of the pulse.

[0037] A transmission path generation module is used to generate a transmission path for the pulse signal between the partial discharge location and the ultra-high frequency sensor; the transmission path includes several GIS components;

[0038] The transmission attenuation calculation module is used to obtain the attenuation coefficient of the GIS component and calculate the transmission attenuation of the transmission path based on the attenuation coefficient.

[0039] The GIS external partial discharge judgment module is used to determine whether the partial discharge phenomenon is GIS external partial discharge based on the transmission attenuation.

[0040] Optionally, the pulse arrival time calculation module includes:

[0041] The first moment acquisition submodule is used to acquire the first moment when the amplitude of the pulse signal detected by each ultra-high frequency sensor reaches the preset threshold when partial discharge phenomenon is detected.

[0042] The second moment acquisition submodule is used to acquire the second moment when each ultra-high frequency sensor detects that the pulse signal has reached its first peak.

[0043] The pulse arrival time calculation submodule is used to calculate the midpoint between the first time and the second time, which is taken as the pulse arrival time when the ultra-high frequency sensor detects the pulse signal.

[0044] Optionally, the partial discharge location determination module includes:

[0045] The time difference calculation submodule is used to calculate the time difference between the arrival times of any two pulses;

[0046] A partial discharge location determination submodule is used to determine the partial discharge location in the GIS based on the time difference.

[0047] The present invention also provides an electronic device, the device comprising a processor and a memory:

[0048] The memory is used to store program code and transmit the program code to the processor;

[0049] The processor is used to execute the GIS external partial discharge identification method as described above, according to the instructions in the program code.

[0050] The present invention also provides a computer-readable storage medium for storing program code for executing the GIS external partial discharge identification method as described in any of the preceding claims.

[0051] As can be seen from the above technical solution, the present invention has the following advantages: When a partial discharge phenomenon is detected, the present invention calculates the pulse arrival time of pulse signals detected by several ultra-high frequency sensors; determines the location of the partial discharge in the GIS based on the pulse arrival time; generates a transmission path of the pulse signal between the partial discharge location and the ultra-high frequency sensors; the transmission path includes several GIS components; obtains the attenuation coefficient of the GIS components; calculates the transmission attenuation of the transmission path based on the attenuation coefficient; and determines whether the partial discharge phenomenon is an external partial discharge in the GIS based on the transmission attenuation. This can effectively identify external discharge signals in the GIS and reduce false alarms caused by GIS discharge. Attached Figure Description

[0052] 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.

[0053] Figure 1 A flowchart illustrating the steps of a GIS external partial discharge identification method provided in this embodiment of the invention;

[0054] Figure 2 A flowchart illustrating the steps of a GIS external partial discharge identification method according to another embodiment of the present invention;

[0055] Figure 3 This is a schematic diagram illustrating pulse arrival time determination provided in an embodiment of the present invention;

[0056] Figure 4 This is a structural block diagram of a GIS external partial discharge identification device provided in an embodiment of the present invention. Detailed Implementation

[0057] This invention provides a method, apparatus, device, and medium for identifying external partial discharge in GIS, which addresses the technical problem that existing GIS discharge identification methods cannot distinguish between internal and external discharges, leading to false alarms in the online monitoring system when external partial discharge signals are received by the GIS UHF sensor.

[0058] 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.

[0059] Please see Figure 1 , Figure 1 The flowchart illustrates the steps of a GIS external partial discharge identification method provided in this embodiment of the invention.

[0060] The present invention provides a method for identifying external partial discharge in GIS, which may specifically include the following steps:

[0061] Step 101: When partial discharge is detected, calculate the pulse arrival time of the pulse signals detected by several ultra-high frequency sensors.

[0062] Step 102: Determine the location of partial discharge in the GIS based on the pulse arrival time;

[0063] A pulse signal is a discrete signal with diverse shapes. Compared to ordinary analog signals (such as sine waves), its waveforms are discontinuous along the Y-axis (there are obvious intervals between waveforms) but possess a certain periodicity. The most common pulse wave is the rectangular wave (also known as a square wave). Pulse signals can be used to represent information, as carrier waves (e.g., in pulse code modulation (PCM) and pulse width modulation (PWM), and also as clock signals for various digital circuits and high-performance chips.

[0064] In this embodiment of the invention, the pulse signal of partial discharge detected by the UHF sensor may originate from inside or outside the GIS equipment. When partial discharge occurs inside the GIS, the arrival time of the pulse from the UHF sensor can be obtained to determine the location of the partial discharge inside the GIS. In this embodiment of the invention, it can be initially assumed that all partial discharges occur inside the GIS, the location of the partial discharge can be calculated, and then the attenuation characteristics of the GIS components can be used to determine whether the location of the partial discharge is correct. If incorrect, it indicates that the location of the partial discharge is outside the GIS.

[0065] Step 103: Generate the transmission path of the pulse signal between the partial discharge location and the UHF sensor; the transmission path includes several GIS components;

[0066] After obtaining the assumed partial discharge location, the transmission path of the pulse signal between the partial discharge location and the UHF sensor can be determined based on the partial discharge location and the relative position of the UHF sensor within the GIS. The transmission path refers to the combination of several GIS components through which the pulse signal travels from the partial discharge location to the UHF sensor.

[0067] Step 104: Obtain the attenuation coefficient of the GIS component and calculate the transmission attenuation of the transmission path based on the attenuation coefficient.

[0068] After determining the transmission path, the attenuation coefficient of each GIS component in the transmission path can be obtained, and the transmission attenuation of the transmission path can be calculated based on the attenuation coefficient.

[0069] When UHF signals are transmitted inside a GIS (Gas Insulation System), the attenuation of the signal varies greatly among different GIS components. This results in UHF sensors closer to the partial discharge source receiving weaker signals than those farther away. This is why it is impossible to locate partial discharges in a GIS by comparing signal strength.

[0070] In one example, the attenuation of some GIS components is shown in Table 1 below:

[0071]

[0072]

[0073] Table 1

[0074] Step 105: Determine whether the partial discharge phenomenon is external partial discharge of the GIS based on the transmission attenuation.

[0075] In the embodiments of the present invention, after determining the transmission attenuation, the actual pulse amplitude of the pulse signal after being transmitted from the partial discharge location to the UHF sensor can be calculated. Then, the magnitude of the difference between the actual pulse amplitude and the amplitude of the pulse signal collected by the UHF sensor can be used to determine whether the partial discharge location is the actual discharge location. If not, the partial discharge phenomenon is characterized as external partial discharge of GIS.

[0076] This invention calculates the arrival times of pulse signals detected by several ultra-high frequency (UHF) sensors when partial discharge is detected; determines the location of the partial discharge in the GIS based on the pulse arrival times; generates a transmission path for the pulse signal between the partial discharge location and the UHF sensors; the transmission path includes several GIS components; obtains the attenuation coefficients of the GIS components; calculates the transmission attenuation of the transmission path based on the attenuation coefficients; and determines whether the partial discharge is an external partial discharge within the GIS based on the transmission attenuation. This effectively identifies external discharge signals within the GIS and reduces false alarms related to GIS discharge.

[0077] Please see Figure 2 , Figure 2 A flowchart illustrating the steps of a GIS external partial discharge identification method according to another embodiment of the present invention. Specifically, it may include the following steps:

[0078] Step 201: When partial discharge is detected, acquire the first moment when the amplitude of the pulse signal detected by each ultra-high frequency sensor reaches the preset threshold.

[0079] Step 202: Obtain the second moment when each ultra-high frequency sensor detects that the pulse signal has reached its first peak value;

[0080] Step 203: Calculate the midpoint between the first and second time points as the pulse arrival time when the UHF sensor detects the pulse signal;

[0081] In practical applications, the waveform of a partial discharge pulse signal rises rapidly before the peak and falls slowly after the peak. When verifying the pulse arrival time at the sensor, a rising edge triggering mechanism is used. The moment when the pulse voltage detected by the sensor exceeds a set threshold is taken as the pulse arrival time. Under this verification mechanism, a large number of pulse reflections arrive later, without affecting the verification of the wavefront that arrives at the sensor first. Since the discharge time of a partial discharge is very short relative to its insulation recovery time—meaning that for a certain defect, a relatively long insulation recovery time is required before the next discharge occurs—the probability of multiple defects simultaneously discharging within 1 μs is very small, even if multiple defects exist within the GIS. Furthermore, the length of a UHF pulse is very short; a 1 μs sampling time is sufficient to encapsulate a complete discharge pulse. Therefore, using 1 μs as the sampling length ensures that when multiple partial discharge defects exist within the GIS, their discharge pulses can be triggered and collected separately, thereby achieving the location of multiple discharge sources.

[0082] Furthermore, since the peak value of each pulse signal is different, the attenuation degree varies when it reaches different UHF sensors; therefore, the threshold value should not be fixed. In one example, such as... Figure 3 As shown, at a sampling rate of 200 MS / s, at each rising edge trigger, the 40 sampling points before the trigger moment and the 160 sampling points after the trigger moment are saved as sampling points (a total of 200 sampling points, corresponding to a 1 μs pulse waveform). The maximum value among the voltage amplitudes of the first m (e.g., 10) sampling points acquired by the UHF sensor is taken as twice the preset threshold T1, which can be expressed as:

[0083] T1 = 2max|x q1 (n)|

[0084] Where, x q1(n) represents the amplitude of the nth sampling point among the first m sampling points of the qth pulse waveform acquired by the UHF sensor, where n ranges from 1, 2, ..., m.

[0085] The midpoint between the first moment when the voltage of the q-th pulse signal first crosses the preset threshold and the second moment corresponding to the first peak value of the pulse is recorded as the pulse arrival time when the UHF sensor detects the pulse signal.

[0086] Step 204: Determine the location of partial discharge in the GIS based on the pulse arrival time;

[0087] In this embodiment of the invention, after obtaining the pulse arrival time, the location of partial discharge can be determined in the GIS based on the pulse arrival time.

[0088] In one example, the step of determining the location of a partial discharge in a GIS based on the pulse arrival time may include the following sub-steps:

[0089] S41, calculate the time difference between the arrival times of any two pulses;

[0090] After obtaining the pulse arrival times of each UHF sensor, the time difference between the arrival times of any two pulses can be calculated.

[0091] In one example, the timest of the q-th discharge pulse arriving at UHF sensors 1 and 2 were recorded. q1 and t q2 Then, the initial time difference Δt of arrival can be calculated. q Preliminary determination:

[0092] Δt q =t q2 -t q1

[0093] To correct the calculated initial time difference, at the two arrival times t q1 and t q2 Add a window with a width of 2p nearby to extract the most relevant segment of the pulse waveform, whose amplitude y qi The expression for (n) is:

[0094] y qi (n)=x qi (Δt q -(p+1)+n)

[0095] In the formula, the range of n is n = 1, 2, ..., 2p+1.

[0096] Calculate the correlation of the q-th pulse waveform acquired by two UHF sensors within a window of width 2p:

[0097]

[0098] In the formula, R q12 (j) represents the correlation between the q-th pulse waveform acquired by UHF sensor 1 and UHF sensor 2 and the range of j is j = -p, -p+1, ..., p.

[0099] Compare each R q12 Find the value of (j) and determine R. q12 (j) When j is at its maximum, the initial time difference between the arrival of the q-th discharge pulse at UHF sensor 1 and UHF sensor 2 is fine-tuned to obtain the fine-tuned time difference Δt. q The fine-tuning formula is:

[0100] Δt q '=Δt q +j

[0101] S42, determine the location of partial discharge in GIS based on the time difference.

[0102] After calculating the time difference between the UHF sensors, the location of partial discharge can be determined in the GIS based on the time difference.

[0103] In this embodiment of the invention, multiple pulses of partial discharge can be located using the time difference positioning method. The positioning result is used as the x-axis and the number of positioning is used as the y-axis. The multiple positioning results are plotted on a graph. The specific method is as follows: initially, the y-value corresponding to each point on the x-axis is set to 0. When the positioning result of a certain pulse is x1, the corresponding point on the x-axis is found in the graph, and the positioning count of that point is incremented by 1. This operation is performed on all pulse positioning results to obtain a distribution graph of the number of positioning results with respect to the positioning results. The peak value of the distribution of positioning results is used as the final positioning result.

[0104] Step 205: Generate the transmission path of the pulse signal between the partial discharge location and the UHF sensor; the transmission path includes several GIS components;

[0105] After obtaining the assumed partial discharge location, the transmission path of the pulse signal between the partial discharge location and the UHF sensor can be determined based on the partial discharge location and the relative position of the UHF sensor within the GIS. The transmission path refers to the combination of several GIS components through which the pulse signal travels from the partial discharge location to the UHF sensor.

[0106] Step 206: Obtain the attenuation coefficient of the GIS component and calculate the transmission attenuation of the transmission path based on the attenuation coefficient.

[0107] After determining the transmission path, the attenuation coefficient of each GIS component in the transmission path can be obtained, and the transmission attenuation of the transmission path can be calculated based on the attenuation coefficient.

[0108] In one example, the step of obtaining the attenuation coefficient of the GIS component and calculating the transmission attenuation of the transmission path based on the attenuation coefficient may include the following sub-steps:

[0109] S61, obtain the length parameters and attenuation coefficient of the GIS component;

[0110] S62, calculate the component transmission attenuation of the GIS component based on the length parameter and attenuation coefficient;

[0111] S63, calculate the sum of the transmission attenuation of all GIS components along the transmission path to obtain the transmission attenuation of the transmission path.

[0112] In one example, assuming the pulse generated at the partial discharge location is transmitted to the UHF sensor A on the bus via the path "discharge source - circuit breaker - current transformer - disconnector - bus - UHF sensor A", the theoretical transmission attenuation is: (T A = Circuit breaker attenuation coefficient * Circuit breaker length + Right-angle turn attenuation coefficient * Length of right-angle turn below circuit breaker + Current transformer attenuation coefficient * Current transformer length + Disconnect switch attenuation coefficient * Busbar disconnect switch length + Right-angle turn attenuation coefficient * Length of right-angle turn at busbar + Busbar attenuation coefficient * Length transmitted along busbar).

[0113] In another example, assume the path of the pulse generated at the partial discharge location to the UHF sensor B at the end of the circuit is "discharge power supply - circuit breaker - current transformer - disconnector - busbar - UHF sensor B". Assuming UHF sensor B is located exactly at this interval on the busbar, the theoretical transmission attenuation is: (T B = Current transformer attenuation coefficient * Current transformer length + Disconnector attenuation coefficient * Line disconnector length + T-connection attenuation coefficient * T-connection angle length at disconnector + Line terminal cylinder attenuation coefficient * Line terminal cylinder length).

[0114] Step 207: Determine whether the partial discharge phenomenon is external partial discharge of the GIS based on the transmission attenuation.

[0115] In the embodiments of the present invention, after determining the transmission attenuation, the actual pulse amplitude of the pulse signal after being transmitted from the partial discharge location to the UHF sensor can be calculated. Then, the magnitude of the difference between the actual pulse amplitude and the amplitude of the pulse signal collected by the UHF sensor can be used to determine whether the partial discharge location is the actual discharge location. If not, the partial discharge phenomenon is characterized as external partial discharge of GIS.

[0116] In one example, the step of determining whether a partial discharge phenomenon is an external partial discharge of a GIS based on the transmission attenuation may include the following sub-steps:

[0117] S71, acquire the signal amplitude of the pulse signal received by each ultra-high frequency sensor;

[0118] S72, combine each ultra-high frequency sensor in pairs to obtain several sensor combinations;

[0119] S73, calculate the first difference between the transmission attenuation of the UHF sensors in each sensor combination;

[0120] S74, calculate the second difference between the signal amplitudes of the UHF sensors in each sensor combination;

[0121] S75, calculate the third difference between the second difference and the first difference of the UHF sensors in each sensor combination;

[0122] S76, determine whether there is a third difference greater than a preset threshold in all sensor combinations;

[0123] S77, if present, is determined to be a partial discharge phenomenon outside the GIS.

[0124] In practical scenarios, each UHF sensor can be paired to obtain several sensor combinations. Then, the first difference between the transmission attenuation of the UHF sensors in each combination and the second difference between the signal amplitudes of the UHF sensors in each combination are calculated. A third difference between the first and second differences is then calculated to see if it exceeds a preset threshold. If it does, it indicates that the actual transmission of the pulse signal does not match the calculated transmission, and the calculated partial discharge location is not the actual partial discharge location. In this case, it can be determined that the partial discharge location is not inside the GIS, and the partial discharge phenomenon is an external partial discharge.

[0125] In one example, consider only two UHF sensors, A and B. Theoretically, the first difference between the signal amplitudes received by UHF sensor A and UHF sensor B should be (T... A -T B If the actual signal amplitude received by UHF sensor A and UHF sensor B is R A R B The second difference in the actual signal amplitude is (R A -R B A threshold Th can be set; if |(T) A -T B )-(R A -R B If |>Th, then it is determined that the partial discharge signal comes from outside the GIS.

[0126] This invention calculates the arrival times of pulse signals detected by several ultra-high frequency (UHF) sensors when partial discharge is detected; determines the location of the partial discharge in the GIS based on the pulse arrival times; generates a transmission path for the pulse signal between the partial discharge location and the UHF sensors; the transmission path includes several GIS components; obtains the attenuation coefficients of the GIS components; calculates the transmission attenuation of the transmission path based on the attenuation coefficients; and determines whether the partial discharge is an external partial discharge within the GIS based on the transmission attenuation. This effectively identifies external discharge signals within the GIS and reduces false alarms related to GIS discharge.

[0127] Please see Figure 4 , Figure 4 This is a structural block diagram of a GIS external partial discharge identification device provided in an embodiment of the present invention.

[0128] This invention provides a GIS external partial discharge identification device, comprising:

[0129] The pulse arrival time calculation module 401 is used to calculate the pulse arrival time of the pulse signals detected by several ultra-high frequency sensors when a partial discharge phenomenon is detected.

[0130] The partial discharge location determination module 402 is used to determine the partial discharge location in the GIS based on the pulse arrival time;

[0131] The transmission path generation module 403 is used to generate the transmission path of the pulse signal between the partial discharge location and the ultra-high frequency sensor; the transmission path includes several GIS components.

[0132] The transmission attenuation calculation module 404 is used to obtain the attenuation coefficient of the GIS component and calculate the transmission attenuation of the transmission path based on the attenuation coefficient.

[0133] The GIS external partial discharge judgment module 405 is used to determine whether the partial discharge phenomenon is an external partial discharge of the GIS based on the transmission attenuation.

[0134] In this embodiment of the invention, the pulse arrival time calculation module 401 includes:

[0135] The first moment acquisition submodule is used to acquire the first moment when the amplitude of the pulse signal detected by each ultra-high frequency sensor reaches the preset threshold when partial discharge phenomenon is detected.

[0136] The second moment acquisition submodule is used to acquire the second moment when each ultra-high frequency sensor detects that the pulse signal has reached its first peak.

[0137] The pulse arrival time calculation submodule is used to calculate the midpoint between the first and second moments, which serves as the pulse arrival time when the UHF sensor detects the pulse signal.

[0138] In this embodiment of the invention, the partial discharge location determination module 402 includes:

[0139] The time difference calculation submodule is used to calculate the time difference between the arrival times of any two pulses;

[0140] The partial discharge location determination submodule is used to determine the location of partial discharge in GIS based on the time difference.

[0141] In this embodiment of the invention, the transmission attenuation calculation module 404 includes:

[0142] The length parameter and attenuation coefficient acquisition submodule is used to acquire the length parameter and attenuation coefficient of GIS components.

[0143] The component transmission attenuation calculation submodule is used to calculate the component transmission attenuation of GIS components based on the length parameter and attenuation coefficient.

[0144] The transmission attenuation calculation submodule is used to calculate the sum of the transmission attenuation of all GIS components along the transmission path to obtain the transmission attenuation of the transmission path.

[0145] In this embodiment of the invention, the GIS external partial discharge judgment module 405 includes:

[0146] The difference calculation submodule is used to calculate the difference between the transmission attenuation of every two UHF sensors;

[0147] The signal amplitude acquisition submodule is used to acquire the signal amplitude of the pulse signals received by each ultra-high frequency sensor;

[0148] The combination submodule is used to combine each UHF sensor in pairs to obtain several sensor combinations;

[0149] The first difference calculation submodule is used to calculate the first difference between the transmission attenuation of the UHF sensors in each sensor combination;

[0150] The second difference calculation submodule is used to calculate the second difference between the signal amplitudes of the ultra-high frequency sensors in each sensor combination;

[0151] The third difference calculation submodule is used to calculate the third difference between the second difference and the first difference of the UHF sensors in each sensor combination;

[0152] The judgment submodule is used to determine whether there is a third difference greater than a preset threshold in all sensor combinations;

[0153] The determination submodule is used to determine, if present, that the partial discharge phenomenon is an external partial discharge of the GIS.

[0154] This invention also provides an electronic device, which includes a processor and a memory:

[0155] The memory is used to store program code and transfer the program code to the processor;

[0156] The processor is used to execute the GIS external partial discharge identification method of the present invention according to the instructions in the program code.

[0157] This invention also provides a computer-readable storage medium for storing program code for executing the GIS external partial discharge identification method of this invention.

[0158] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0159] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0160] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, embodiments of the present invention can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of the present invention can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0161] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0162] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0163] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0164] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0165] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0166] 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. A method for identifying external partial discharge in GIS, characterized in that, include: When partial discharge is detected, the arrival time of the pulse signals detected by several ultra-high frequency sensors is calculated. The location of the partial discharge is determined in the GIS based on the arrival time of the pulse. A transmission path for the pulse signal is generated between the partial discharge location and the ultra-high frequency sensor; the transmission path includes several GIS components; Obtain the attenuation coefficient of the GIS component, and calculate the transmission attenuation of the transmission path based on the attenuation coefficient; Determine whether the partial discharge phenomenon is an external partial discharge of the GIS based on the transmission attenuation amount. The step of determining whether the partial discharge phenomenon is an external partial discharge of the GIS based on the transmission attenuation includes: Calculate the difference in transmission attenuation between every two UHF sensors; Obtain the signal amplitude of the pulse signals received by each ultra-high frequency sensor; By combining each ultra-high frequency sensor in pairs, several sensor combinations are obtained; Calculate the first difference between the transmission attenuation of the UHF sensors in each sensor combination; Calculate the second difference between the signal amplitudes of the ultra-high frequency sensors in each sensor combination; Calculate the third difference between the second difference and the first difference of the UHF sensors in each sensor combination; Determine whether there is a third difference greater than a preset threshold in all the sensor combinations; If present, the partial discharge phenomenon is determined to be external partial discharge of the GIS; The step of calculating the pulse arrival times of pulse signals detected by several ultra-high frequency sensors when partial discharge is detected includes: When partial discharge is detected, the first moment when the amplitude of the pulse signal detected by each ultra-high frequency sensor reaches the preset threshold is obtained; Obtain the second moment when the pulse signal detected by each ultra-high frequency sensor reaches its first peak value; Calculate the midpoint between the first time point and the second time point as the pulse arrival time when the ultra-high frequency sensor detects the pulse signal; The step of obtaining the attenuation coefficient of the GIS component and calculating the transmission attenuation of the transmission path based on the attenuation coefficient includes: Obtain the length parameters and attenuation coefficient of the GIS component; The transmission attenuation of the GIS component is calculated based on the length parameter and the attenuation coefficient. The transmission attenuation of the transmission path is obtained by summing the transmission attenuation of all GIS components along the transmission path.

2. The method according to claim 1, characterized in that, The step of determining the partial discharge location in the GIS based on the pulse arrival time includes: Calculate the time difference between the arrival times of any two pulses; The location of partial discharge is determined in the GIS based on the time difference.

3. A GIS external partial discharge identification device, characterized in that, include: The pulse arrival time calculation module is used to calculate the pulse arrival time of the pulse signals detected by several ultra-high frequency sensors when partial discharge is detected. A partial discharge location determination module is used to determine the partial discharge location in the GIS based on the arrival time of the pulse. A transmission path generation module is used to generate a transmission path for the pulse signal between the partial discharge location and the ultra-high frequency sensor; the transmission path includes several GIS components; The transmission attenuation calculation module is used to obtain the attenuation coefficient of the GIS component and calculate the transmission attenuation of the transmission path based on the attenuation coefficient. The GIS external partial discharge judgment module is used to determine whether the partial discharge phenomenon is GIS external partial discharge based on the transmission attenuation. The GIS external partial discharge detection module includes: The difference calculation submodule is used to calculate the difference between the transmission attenuation of every two UHF sensors; The signal amplitude acquisition submodule is used to acquire the signal amplitude of the pulse signals received by each ultra-high frequency sensor; The combination submodule is used to combine each UHF sensor in pairs to obtain several sensor combinations; The first difference calculation submodule is used to calculate the first difference between the transmission attenuation of the UHF sensors in each sensor combination; The second difference calculation submodule is used to calculate the second difference between the signal amplitudes of the ultra-high frequency sensors in each sensor combination; The third difference calculation submodule is used to calculate the third difference between the second difference and the first difference of the UHF sensors in each sensor combination; The judgment submodule is used to determine whether there is a third difference greater than a preset threshold in all sensor combinations; The determination submodule is used to determine, if present, whether the partial discharge phenomenon is an external partial discharge of the GIS. The pulse arrival time calculation module includes: The first moment acquisition submodule is used to acquire the first moment when the amplitude of the pulse signal detected by each ultra-high frequency sensor reaches the preset threshold when partial discharge phenomenon is detected. The second moment acquisition submodule is used to acquire the second moment when each ultra-high frequency sensor detects that the pulse signal has reached its first peak. The pulse arrival time calculation submodule is used to calculate the midpoint between the first time and the second time, which is taken as the pulse arrival time when the ultra-high frequency sensor detects the pulse signal. The transmission attenuation calculation module includes: The length parameter and attenuation coefficient acquisition submodule is used to acquire the length parameter and attenuation coefficient of GIS components. The component transmission attenuation calculation submodule is used to calculate the component transmission attenuation of GIS components based on the length parameter and attenuation coefficient. The transmission attenuation calculation submodule is used to calculate the sum of the transmission attenuation of all GIS components along the transmission path to obtain the transmission attenuation of the transmission path.

4. The apparatus according to claim 3, characterized in that, The partial discharge location determination module includes: The time difference calculation submodule is used to calculate the time difference between the arrival times of any two pulses; A partial discharge location determination submodule is used to determine the partial discharge location in the GIS based on the time difference.

5. An electronic device, characterized in that, The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the GIS external partial discharge identification method according to any one of the claims 1-2 according to the instructions in the program code.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program code for executing the GIS external partial discharge identification method according to any one of claims 1-2.

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