CN116430181A - GIS external partial discharge identification method, device, equipment and medium - Google Patents
GIS external partial discharge identification method, device, equipment and medium Download PDFInfo
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Abstract
The invention discloses a GIS external partial discharge identification method, device, equipment and medium, which are used for solving the technical problem that the existing GIS discharge identification method cannot distinguish internal discharge from external discharge, so that when a GIS external partial discharge signal is received by a GIS ultrahigh frequency sensor, false alarm can be caused to an online monitoring system. The invention comprises the following steps: when the partial discharge phenomenon is detected, calculating pulse arrival time of the pulse signals detected by the plurality of ultrahigh 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 ultrahigh frequency sensor; the transmission path comprises a plurality of GIS components; acquiring an attenuation coefficient of the GIS component, and calculating the transmission attenuation of the transmission path according to the attenuation coefficient; judging whether the partial discharge phenomenon is GIS external partial discharge or not according to the transmission attenuation.
Description
Technical Field
The invention relates to the technical field of GIS (geographic information system), in particular to a GIS external partial discharge identification method, device, equipment and medium.
Background
The gas insulated switchgear (Gas Insulated Switchgear, GIS) is used as main equipment of the urban power grid, plays a crucial role in the power supply reliability of the power grid, and is valued by power grid companies. Potential defects of insulation can be left in GIS equipment production and manufacturing and engineering construction, and with the increase of the operation life, the defects can develop into dangerous discharge channels, so that GIS breakdown faults can be caused, accidents can be caused, and economic losses and personal casualties are caused.
GIS internal insulation defects are often accompanied by partial discharge phenomena. Through the ultrahigh frequency partial discharge detection technology, the partial discharge live detection device is used for detecting the internal insulation defect of the GIS during normal operation, the health state of GIS equipment can be evaluated in real time on the premise of not influencing the operation of a power grid, hidden dangers are found in time, and equipment faults are avoided.
The digital twin is to fully utilize data such as a physical model, sensor update, operation history and the like, integrate simulation processes of multiple disciplines, multiple physical quantities, multiple scales and multiple probabilities, and complete mapping in a virtual space so as to reflect the full life cycle process of corresponding entity equipment.
The digital twin is a technology which fully utilizes the multidisciplinary advantages of models, data, intelligent integration and the like, has the mapping capability on the GIS full life cycle state, provides powerful analysis decision support for GIS predictive maintenance, can trace details of power equipment fault reasons, continuously improves a design model in the information world by utilizing information of interactive feedback, and greatly optimizes the integral design of the GIS, so that the development of GIS state diagnosis and evaluation technology research based on the digital twin technology has very important engineering practical significance.
In the prior art, an ultrahigh frequency method can be adopted to perform on-line monitoring of partial discharge of GIS equipment, so that accurate judgment on whether the discharge exists or not can be realized at present, but whether the discharge comes from the inside of the GIS cannot be reliably distinguished. When the GIS external partial discharge signal is received by the GIS ultrahigh frequency sensor, false alarm can be caused to occur to the online monitoring system.
Disclosure of Invention
The invention provides a GIS external partial discharge identification method, device, equipment and medium, which are used for solving the technical problem that the existing GIS discharge identification method cannot distinguish internal discharge from external discharge, so that when a GIS external partial discharge signal is received by a GIS ultrahigh frequency sensor, false alarm occurs in an online monitoring system.
The invention provides a GIS external partial discharge identification method, which comprises the following steps:
when the partial discharge phenomenon is detected, calculating pulse arrival time of the pulse signals detected by the plurality of ultrahigh 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 ultrahigh frequency sensor; the transmission path comprises a plurality of GIS components;
acquiring an attenuation coefficient of the GIS component, and calculating the transmission attenuation of the transmission path according to the attenuation coefficient;
judging whether the partial discharge phenomenon is GIS external partial discharge or not according to the transmission attenuation.
Optionally, when the partial discharge phenomenon is detected, the step of calculating the pulse arrival time when the pulse signals are detected by the plurality of ultrahigh frequency sensors includes:
when the partial discharge phenomenon is detected, a first moment when the amplitude of the pulse signal detected by each ultrahigh frequency sensor reaches a preset threshold value is obtained;
acquiring a second moment when each ultrahigh frequency sensor detects that the pulse signal reaches a first peak value;
and calculating the midpoints of the first moment and the second moment as the pulse arrival moment of the pulse signal detected by the ultrahigh frequency sensor.
Optionally, the step of determining the partial discharge position in the GIS according to the pulse arrival time includes:
calculating the time difference of the arrival time of any two pulses;
and determining the partial discharge position in the GIS according to the time difference.
Optionally, the step of obtaining the attenuation coefficient of the GIS component and calculating the transmission attenuation of the transmission path according to the attenuation coefficient includes:
acquiring length parameters and attenuation coefficients of the GIS component;
calculating the component transmission attenuation of the GIS component according to the length parameter and the attenuation coefficient;
and calculating the sum of the component transmission attenuation amounts of all the GIS components of the transmission path to obtain the transmission attenuation amount of the transmission path.
Optionally, the step of judging whether the partial discharge phenomenon is partial discharge outside the GIS according to the transmission attenuation amount includes:
calculating the difference value between the transmission attenuation amounts of every two ultrahigh frequency sensors;
acquiring signal amplitude values of pulse signals received by all ultrahigh frequency sensors;
each ultrahigh frequency sensor is combined two by two to obtain a plurality of sensors;
calculating a first difference between transmission attenuation amounts of the ultrahigh frequency sensors in each sensor combination;
calculating a second difference between the signal amplitudes of the ultrahigh frequency sensors in each sensor combination;
calculating a third difference between the second difference and the first difference of the ultrahigh frequency sensor in each sensor combination;
judging whether a third difference value larger than a preset threshold value exists in all the sensor combinations;
and if the partial discharge phenomenon exists, judging that the partial discharge phenomenon is GIS external partial discharge.
The invention also provides a GIS external partial discharge identification device, which comprises:
the pulse arrival time calculation module is used for calculating the pulse arrival time of the pulse signals detected by the plurality of ultrahigh frequency sensors when the partial discharge phenomenon is detected;
the partial discharge position determining module is used for determining the partial discharge position in the GIS according to the pulse arrival time;
the transmission path generation module is used for generating a transmission path of the pulse signal between the partial discharge position and the ultrahigh frequency sensor; the transmission path comprises a plurality of GIS components;
the transmission attenuation calculating module is used for obtaining the attenuation coefficient of the GIS component and calculating the transmission attenuation of the transmission path according to the attenuation coefficient;
and the GIS external partial discharge judging module is used for judging whether the partial discharge phenomenon is GIS external partial discharge or not according to the transmission attenuation.
Optionally, the pulse arrival time calculation module includes:
the first time acquisition submodule is used for acquiring a first time when the amplitude of the pulse signal detected by each ultrahigh frequency sensor reaches a preset threshold value when the partial discharge phenomenon is detected;
the second moment acquisition submodule is used for acquiring the second moment when each ultrahigh frequency sensor detects that the pulse signal reaches the first peak value;
and the pulse arrival time calculation sub-module is used for calculating the midpoints of the first time and the second time as the pulse arrival time when the ultrahigh frequency sensor detects the pulse signal.
Optionally, the partial discharge position determining module includes:
the time difference calculation sub-module is used for calculating the time difference of the arrival time of any two pulses;
and the partial discharge position determining submodule is used for determining the partial discharge position in the GIS according to the time difference.
The invention also provides an electronic device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the GIS external partial discharge identification method according to any one of the above claims according to instructions in the program code.
The present invention also provides a computer readable storage medium for storing program code for performing the GIS external partial discharge identification method as set forth in any one of the above.
From the above technical scheme, the invention has the following advantages: when the partial discharge phenomenon is detected, the pulse arrival time of the pulse signals detected by the ultrahigh frequency sensors is calculated; 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 ultrahigh frequency sensor; the transmission path comprises a plurality of GIS components; acquiring an attenuation coefficient of the GIS component, and calculating the transmission attenuation of the transmission path according to the attenuation coefficient; judging whether the partial discharge phenomenon is GIS external partial discharge or not according to the transmission attenuation. The external discharge signal in the GIS can be effectively identified, and the GIS discharge false alarm is reduced.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of steps of a GIS external partial discharge identification method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps of a GIS external partial discharge identification method according to another embodiment of the present invention;
fig. 3 is a schematic diagram of determining arrival time of a pulse according to an embodiment of the present invention;
fig. 4 is a block diagram of a GIS external partial discharge identification device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a GIS external partial discharge identification method, device, equipment and medium, which are used for solving the technical problem that the existing GIS discharge identification method cannot distinguish internal discharge from external discharge, so that when a GIS external partial discharge signal is received by a GIS ultrahigh frequency sensor, false alarm can be caused to an online monitoring system.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a GIS external partial discharge identification method according to an embodiment of the present invention.
The invention provides a GIS external partial discharge identification method, which specifically comprises the following steps:
the pulse signal is a discrete signal, has various shapes, and is characterized in that the waveforms are discontinuous on the Y-axis (the waveforms have obvious intervals) but have certain periodicity compared with the common analog signal (such as sine wave). The most common pulse wave is a rectangular wave (i.e., square wave). Pulse signals may be used to represent information, as carrier waves such as Pulse Code Modulation (PCM), pulse Width Modulation (PWM), etc. in pulse modulation, as well as clock signals for various digital circuits, high performance chips.
In the embodiment of the invention, the pulse signal of the partial discharge phenomenon detected by the ultrahigh frequency sensor may come from the inside or the outside of the GIS equipment. When partial discharge occurs in the GIS, the pulse arrival time of the ultrahigh frequency sensor can be obtained, and the partial discharge position in the GIS can be determined. In the embodiment of the invention, partial discharge can be calculated to obtain the partial discharge position by assuming that the partial discharge occurs in the GIS, and then whether the partial discharge position is correct or not can be judged by the attenuation characteristic of the GIS component. An incorrect characterization of the partial discharge location is outside the GIS.
after the assumed partial discharge position is obtained, a transmission path of the pulse signal between the partial discharge position and the ultrahigh frequency sensor can be determined according to the partial discharge position and the relative position of the ultrahigh frequency sensor in the GIS. The transmission path is a combination of a plurality of GIS components through which the pulse signal is transmitted from the partial discharge position to the ultrahigh frequency sensor.
104, acquiring an attenuation coefficient of the GIS component, and calculating the transmission attenuation of the transmission path according to the attenuation coefficient;
after the transmission path is determined, attenuation coefficients of each GIS component in the transmission path may be acquired to calculate a transmission attenuation amount of the transmission path based on the attenuation coefficients.
When the ultrahigh frequency signal is transmitted in the GIS, the attenuation degree of the signals by different GIS components is quite different, so that the signals received by the ultrahigh frequency sensor close to the local discharge source are smaller than the signals received by the ultrahigh frequency sensor far from the local discharge source. This is why it is not possible to locate GIS partial discharges by comparing the signal magnitudes.
In one example, the attenuation of a portion of the GIS component is shown in table 1 below:
TABLE 1
And step 105, judging whether the partial discharge phenomenon is GIS external partial discharge according to the transmission attenuation.
In the embodiment of the invention, after the transmission attenuation is determined, the actual pulse amplitude of the pulse signal transmitted from the partial discharge position to the ultrahigh frequency sensor can be calculated, so that whether the partial discharge position is the actual discharge position or not is judged according to the amplitude between the actual pulse amplitude and the amplitude of the pulse signal acquired by the ultrahigh frequency sensor, and if not, the partial discharge phenomenon is represented as GIS external partial discharge.
When the partial discharge phenomenon is detected, the pulse arrival time of the pulse signals detected by the ultrahigh frequency sensors is calculated; 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 ultrahigh frequency sensor; the transmission path comprises a plurality of GIS components; acquiring an attenuation coefficient of the GIS component, and calculating the transmission attenuation of the transmission path according to the attenuation coefficient; judging whether the partial discharge phenomenon is GIS external partial discharge or not according to the transmission attenuation. The external discharge signal in the GIS can be effectively identified, and the GIS discharge false alarm is reduced.
Referring to fig. 2, fig. 2 is a flowchart illustrating steps of a GIS external partial discharge identification method according to another embodiment of the present invention. The method specifically comprises the following steps:
in practical application, the waveform of the pulse signal of partial discharge rises rapidly before the peak and falls slowly after the peak, a rising edge trigger mechanism is adopted when the time of detecting the pulse reaching the sensor, the moment when the pulse voltage detected by the sensor exceeds a set threshold value is taken as the moment when the pulse reaches the sensor, and under the detection mechanism, a large amount of refraction and reflection of the pulse reach at the back, so that the detection of the wave head which reaches the sensor at first is not influenced. Since the discharge time of partial discharge is short relative to the insulation recovery time thereof, that is, for a certain defect, it takes a relatively long insulation recovery time after one discharge to generate the next discharge, even if a plurality of defects exist in the GIS at the same time, the probability of simultaneous discharge in 1 μs is small. In addition, the length of the ultrahigh frequency pulse is very short, and the sampling time of 1 mu s is enough to envelop a complete discharge pulse, so that the sampling length of 1 mu s is taken, and the discharge pulse can be triggered and acquired respectively when a plurality of partial discharge defects exist in the GIS, thereby realizing the positioning of a plurality of discharge sources.
In addition, since the peak value of each pulse signal is different, the attenuation degree when reaching different uhf sensors is different, and thus the set threshold value should not be fixed. In one example, as shown in FIG. 3, at a sampling rate of 200MS/s, every rising edge trigger, 40 sampling points before the trigger time and 160 sampling points after the trigger time are saved as samplesThe point (200 sampling points correspond to 1 mu s pulse waveform) is that 2 times of the maximum value in the voltage amplitudes of the first m (such as 10) sampling points acquired by the ultrahigh frequency sensor is taken as a preset threshold T 1 This can be expressed as:
T 1 ＝2max|x q1 (n)|
wherein x is q1 And (n) represents the amplitude of the nth sample point in the first m sample points of the q-th pulse waveform acquired by the ultrahigh frequency sensor, wherein the value range of n is n=1, 2.
And recording the midpoint of the second moment corresponding to the first peak value of the pulse at the first moment when the voltage of the q-th pulse signal first passes through the preset threshold value as the pulse arrival moment when the pulse arrival ultrahigh frequency sensor detects the pulse signal.
in the embodiment of the invention, after the pulse arrival time is acquired, the partial discharge position can be determined in the GIS according to the pulse arrival time.
In one example, the step of determining the location of the partial discharge in the GIS based on the arrival time of the pulse may comprise the sub-steps of:
s41, calculating the time difference of the arrival time of any two pulses;
after the pulse arrival time of each ultrahigh frequency sensor is obtained, the time difference of any two pulse arrival times can be calculated.
In one example, the time t at which the qth discharge pulse reaches the uhf sensors 1 and 2, respectively, is recorded q1 And t q2 The initial time difference of arrival Δt can then be used q The preliminary steps are as follows:
Δt q ＝t q2 -t q1
to correct the calculated initial time difference, at two arrival times t q1 And t q2 A window with the width of 2p is added nearby, a section of pulse waveform with the most concerned amplitude y is taken out qi The expression of (n) is:
y qi (n)＝x qi (Δt q -(p+1)+n)
wherein n has a value in the range of n=1, 2.
Calculating the correlation of the q-th pulse waveform acquired by the two ultrahigh frequency sensors in a window with the width of 2 p:
wherein R is q12 (j) The correlation between the q-th pulse waveforms acquired by the ultrahigh frequency sensor 1 and the ultrahigh frequency sensor 2 is represented by-p to p, and the value range of j is j= -p, -p+1.
Comparing R' s q12 (j) Find R by the value of R q12 (j) J when the discharge pulse reaches the maximum, fine tuning the initial time difference of the q-th discharge pulse reaching the ultrahigh frequency sensor 1 and the ultrahigh frequency sensor 2 respectively to obtain a fine-tuned time difference delta t q The fine tuning formula is:
Δt q '＝Δt q +j
s42, determining the partial discharge position in the GIS according to the time difference.
After the time difference between the ultrahigh frequency sensors is calculated, the partial discharge position can be determined in the GIS according to the time difference.
In the embodiment of the invention, a plurality of pulses of partial discharge can be positioned according to a time difference positioning method, the positioning result is taken as an x axis, the positioning times are taken as a y axis, and the positioning results are drawn on a graph, and the specific method is as follows: when the positioning result of a certain pulse is x1, finding the corresponding point on the x axis in the graph, adding 1 to the positioning times of the point, and executing the operation on all pulse positioning results to obtain a distribution diagram of the positioning times relative to the positioning results, wherein the peak value of the positioning result distribution is used as the final positioning result.
after the assumed partial discharge position is obtained, a transmission path of the pulse signal between the partial discharge position and the ultrahigh frequency sensor can be determined according to the partial discharge position and the relative position of the ultrahigh frequency sensor in the GIS. The transmission path is a combination of a plurality of GIS components through which the pulse signal is transmitted from the partial discharge position to the ultrahigh frequency sensor.
after the transmission path is determined, attenuation coefficients of each GIS component in the transmission path may be acquired to calculate a transmission attenuation amount of the transmission path based on the attenuation coefficients.
In one example, the step of obtaining the attenuation coefficient of the GIS component and calculating the transmission attenuation amount of the transmission path according to the attenuation coefficient may include the sub-steps of:
s61, acquiring length parameters and attenuation coefficients of the GIS components;
s62, calculating the component transmission attenuation of the GIS component according to the length parameter and the attenuation coefficient;
s63, calculating the sum of the component transmission attenuation amounts of all GIS components of the transmission path, and obtaining the transmission attenuation amount of the transmission path.
In one example, assuming that the path of the pulse generated at the partial discharge position transmitted to the uhf sensor a on the bus bar is "discharge source-breaker-current transformer-disconnector-bus bar-uhf sensor a", the theoretical transmission attenuation is: (T) A Circuit breaker length + right angle corner attenuation coefficient + right angle corner length below circuit breaker + current transformer attenuation coefficient + current transformer length + isolating switch attenuation coefficient + bus bar isolating switch length + right angle corner attenuation coefficient + bus bar corner length at bus bar + bus bar attenuation coefficient + length along bus bar transmission).
In another example, assume that the path of the pulse generated at the partial discharge location transmitted to the uhf sensor B at the road terminal is "discharge source-breaker-current transformer-disconnector-bus-uhf sensor B". Assuming that the uhf sensor B is located exactly at the interval of the bus, the theoretical transmission attenuation is: (T) B =currentTransformer attenuation coefficient, current transformer length, isolating switch attenuation coefficient, line isolating switch length, T-junction attenuation coefficient, T-junction transition angle length at the isolating switch, line terminal barrel attenuation coefficient, and line terminal barrel length).
In the embodiment of the invention, after the transmission attenuation is determined, the actual pulse amplitude of the pulse signal transmitted from the partial discharge position to the ultrahigh frequency sensor can be calculated, so that whether the partial discharge position is the actual discharge position or not is judged according to the amplitude between the actual pulse amplitude and the amplitude of the pulse signal acquired by the ultrahigh frequency sensor, and if not, the partial discharge phenomenon is represented as GIS external partial discharge.
In one example, the step of determining whether the partial discharge phenomenon is the partial discharge outside the GIS according to the transmission attenuation amount may include the sub-steps of:
s71, acquiring signal amplitude values of pulse signals received by all ultrahigh frequency sensors;
s72, combining the ultrahigh frequency sensors in pairs to obtain a plurality of sensor combinations;
s73, calculating a first difference value between transmission attenuation amounts of the ultrahigh frequency sensors in each sensor combination;
s74, calculating a second difference value between the signal amplitudes of the ultrahigh frequency sensors in each sensor combination;
s75, calculating a third difference value between the second difference value and the first difference value of the ultrahigh frequency sensor in each sensor combination;
s76, judging whether a third difference value larger than a preset threshold value exists in all the sensor combinations;
and S77, if the partial discharge phenomenon exists, judging that the partial discharge phenomenon is GIS external partial discharge.
In an actual scene, every ultrahigh frequency sensor can be combined two by two to obtain a plurality of sensors, then a first difference value between transmission attenuation amounts of the ultrahigh frequency sensors in each sensor combination is calculated, and a second difference value between signal amplitudes of the ultrahigh frequency sensors in each sensor combination is calculated; and calculating whether a third difference value between the first difference value and the second difference value is larger than a preset threshold value, if so, representing that the actual transmission condition of the pulse signal is not consistent with the calculated transmission condition, and the calculated partial discharge position is not the actual partial discharge position. At the moment, the partial discharge position can be judged not to be in the GIS, and the partial discharge phenomenon is partial discharge outside the GIS.
In one example, only A, B are examples of uhf sensors. Theoretically, the first difference between the amplitudes of the signals received by the ultrahigh frequency sensor A and the ultrahigh frequency sensor B should be (T) A -T B ) If the actual signal amplitude received by the ultrahigh frequency sensor A and the ultrahigh frequency sensor B is R A 、R B The second difference in the actual signal amplitude is (R A -R B ) The threshold Th can be set, if (T) A -T B )-(R A -R B )|>Th, the partial discharge signal is determined to be from the outside of the GIS.
When the partial discharge phenomenon is detected, the pulse arrival time of the pulse signals detected by the ultrahigh frequency sensors is calculated; 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 ultrahigh frequency sensor; the transmission path comprises a plurality of GIS components; acquiring an attenuation coefficient of the GIS component, and calculating the transmission attenuation of the transmission path according to the attenuation coefficient; judging whether the partial discharge phenomenon is GIS external partial discharge or not according to the transmission attenuation. The external discharge signal in the GIS can be effectively identified, and the GIS discharge false alarm is reduced.
Referring to fig. 4, fig. 4 is a block diagram illustrating a GIS external partial discharge identification apparatus according to an embodiment of the present invention.
The embodiment of the invention provides a GIS external partial discharge identification device, which comprises:
the pulse arrival time calculation module 401 is configured to calculate pulse arrival times when the plurality of ultrahigh frequency sensors detect the pulse signals when the partial discharge phenomenon is detected;
a partial discharge position determining module 402, configured to determine a partial discharge position in the GIS according to the arrival time of the pulse;
a transmission path generating module 403, configured to generate a transmission path of the pulse signal between the partial discharge position and the uhf sensor; the transmission path comprises a plurality of GIS components;
the transmission attenuation calculating module 404 is configured to obtain an attenuation coefficient of the GIS component, and calculate a transmission attenuation of the transmission path according to the attenuation coefficient;
the GIS external partial discharge judging module 405 is configured to judge whether the partial discharge phenomenon is GIS external partial discharge according to the transmission attenuation amount.
In the embodiment of the present invention, the pulse arrival time calculation module 401 includes:
the first time acquisition submodule is used for acquiring a first time when the amplitude of the pulse signal detected by each ultrahigh frequency sensor reaches a preset threshold value when the partial discharge phenomenon is detected;
the second moment acquisition submodule is used for acquiring the second moment when each ultrahigh frequency sensor detects that the pulse signal reaches the first peak value;
the pulse arrival time calculation sub-module is used for calculating the midpoint between the first time and the second time and taking the midpoint as the pulse arrival time when the ultrahigh frequency sensor detects the pulse signal.
In an embodiment of the present invention, the partial discharge position determining module 402 includes:
the time difference calculation sub-module is used for calculating the time difference of the arrival time of any two pulses;
and the partial discharge position determining submodule is used for determining the partial discharge position in the GIS according to the time difference.
In the embodiment of the present invention, the transmission attenuation amount calculation module 404 includes:
the length parameter and attenuation coefficient acquisition submodule is used for acquiring the length parameter and attenuation coefficient of the GIS component;
the component transmission attenuation amount calculation operator module is used for calculating the component transmission attenuation amount of the GIS component according to the length parameter and the attenuation coefficient;
and the transmission attenuation amount calculation operator module is used for calculating the sum of the component transmission attenuation amounts of all GIS components of the transmission path to obtain the transmission attenuation amount of the transmission path.
In the embodiment of the present invention, the GIS external partial discharge determining module 405 includes:
the difference value calculation sub-module is used for calculating the difference value between the transmission attenuation amounts of every two ultrahigh frequency sensors;
the signal amplitude acquisition sub-module is used for acquiring the signal amplitude of the pulse signal received by each ultrahigh frequency sensor;
the combination submodule is used for carrying out pairwise combination on all the ultrahigh frequency sensors to obtain a plurality of sensor combinations;
the first difference value calculation sub-module is used for calculating a first difference value between transmission attenuation amounts of the ultrahigh frequency sensors in each sensor combination;
the second difference value calculation sub-module is used for calculating a second difference value between the signal amplitudes of the ultrahigh frequency sensors in each sensor combination;
a third difference calculation sub-module for calculating a third difference between the second difference and the first difference of the ultrahigh frequency sensor in each sensor combination;
the judging submodule is used for judging whether a third difference value larger than a preset threshold value exists in all the sensor combinations;
and the judging sub-module is used for judging that the partial discharge phenomenon is GIS external partial discharge if the partial discharge phenomenon exists.
The embodiment of the invention also provides electronic equipment, which comprises a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is used for executing the GIS external partial discharge identification method according to the embodiment of the invention according to the instructions in the program codes.
The embodiment of the invention also provides a computer readable storage medium, which is used for storing program codes, and the program codes are used for executing the GIS external partial discharge identification method.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present invention are 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 flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may 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, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The GIS external partial discharge identification method is characterized by comprising the following steps:
when the partial discharge phenomenon is detected, calculating pulse arrival time of the pulse signals detected by the plurality of ultrahigh 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 ultrahigh frequency sensor; the transmission path comprises a plurality of GIS components;
acquiring an attenuation coefficient of the GIS component, and calculating the transmission attenuation of the transmission path according to the attenuation coefficient;
judging whether the partial discharge phenomenon is GIS external partial discharge or not according to the transmission attenuation.
2. The method according to claim 1, wherein the step of calculating the pulse arrival time of the pulse signal detected by the plurality of uhf sensors when the partial discharge phenomenon is detected comprises:
when the partial discharge phenomenon is detected, a first moment when the amplitude of the pulse signal detected by each ultrahigh frequency sensor reaches a preset threshold value is obtained;
acquiring a second moment when each ultrahigh frequency sensor detects that the pulse signal reaches a first peak value;
and calculating the midpoints of the first moment and the second moment as the pulse arrival moment of the pulse signal detected by the ultrahigh frequency sensor.
3. The method of claim 1, wherein the step of determining the partial discharge location in the GIS based on the pulse arrival time comprises:
calculating the time difference of the arrival time of any two pulses;
and determining the partial discharge position in the GIS according to the time difference.
4. The method according to claim 1, wherein the step of obtaining the attenuation coefficient of the GIS component and calculating the transmission attenuation amount of the transmission path based on the attenuation coefficient comprises:
acquiring length parameters and attenuation coefficients of the GIS component;
calculating the component transmission attenuation of the GIS component according to the length parameter and the attenuation coefficient;
and calculating the sum of the component transmission attenuation amounts of all the GIS components of the transmission path to obtain the transmission attenuation amount of the transmission path.
5. The method of claim 1, wherein the step of determining whether the partial discharge phenomenon is a GIS external partial discharge according to the transmission attenuation amount comprises:
calculating the difference value between the transmission attenuation amounts of every two ultrahigh frequency sensors;
acquiring signal amplitude values of pulse signals received by all ultrahigh frequency sensors;
each ultrahigh frequency sensor is combined two by two to obtain a plurality of sensors;
calculating a first difference between transmission attenuation amounts of the ultrahigh frequency sensors in each sensor combination;
calculating a second difference between the signal amplitudes of the ultrahigh frequency sensors in each sensor combination;
calculating a third difference between the second difference and the first difference of the ultrahigh frequency sensor in each sensor combination;
judging whether a third difference value larger than a preset threshold value exists in all the sensor combinations;
and if the partial discharge phenomenon exists, judging that the partial discharge phenomenon is GIS external partial discharge.
6. A GIS external partial discharge identification device, comprising:
the pulse arrival time calculation module is used for calculating the pulse arrival time of the pulse signals detected by the plurality of ultrahigh frequency sensors when the partial discharge phenomenon is detected;
the partial discharge position determining module is used for determining the partial discharge position in the GIS according to the pulse arrival time;
the transmission path generation module is used for generating a transmission path of the pulse signal between the partial discharge position and the ultrahigh frequency sensor; the transmission path comprises a plurality of GIS components;
the transmission attenuation calculating module is used for obtaining the attenuation coefficient of the GIS component and calculating the transmission attenuation of the transmission path according to the attenuation coefficient;
and the GIS external partial discharge judging module is used for judging whether the partial discharge phenomenon is GIS external partial discharge or not according to the transmission attenuation.
7. The apparatus of claim 6, wherein the pulse arrival time calculation module comprises:
the first time acquisition submodule is used for acquiring a first time when the amplitude of the pulse signal detected by each ultrahigh frequency sensor reaches a preset threshold value when the partial discharge phenomenon is detected;
the second moment acquisition submodule is used for acquiring the second moment when each ultrahigh frequency sensor detects that the pulse signal reaches the first peak value;
and the pulse arrival time calculation sub-module is used for calculating the midpoints of the first time and the second time as the pulse arrival time when the ultrahigh frequency sensor detects the pulse signal.
8. The apparatus of claim 6, wherein the partial discharge position determination module comprises:
the time difference calculation sub-module is used for calculating the time difference of the arrival time of any two pulses;
and the partial discharge position determining submodule is used for determining the partial discharge position in the GIS according to the time difference.
9. An electronic device, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the GIS external partial discharge identification method of any one of claims 1-5 according to instructions in the program code.
10. A computer readable storage medium, characterized in that the computer readable storage medium is adapted to store a program code for performing the GIS external partial discharge identification method according to any one of claims 1-5.
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| CN116973702A (en) * | 2023-07-31 | 2023-10-31 | 上海莫克电子技术有限公司 | Signal identification method and system applied to GIS partial discharge test |
| CN116973702B (en) * | 2023-07-31 | 2024-04-05 | 上海莫克电子技术有限公司 | Signal identification method and system applied to GIS partial discharge test |
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