CN117092458A - Method and system for determining cable alternating-current withstand voltage partial discharge pulse waveform - Google Patents
Method and system for determining cable alternating-current withstand voltage partial discharge pulse waveform Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention discloses a method and a system for determining a cable alternating-current voltage-withstanding partial discharge pulse waveform, wherein the method comprises the following steps: the partial discharge detector collects synchronous signals and partial discharge signals in real time during cable alternating-current voltage-withstanding partial discharge test, and generates a first two-dimensional array according to the synchronous signals and the partial discharge signals; the partial discharge detector uploads the synchronous signal and the partial discharge signal to partial discharge measuring software, and the partial discharge measuring software generates a second two-dimensional array corresponding to the first two-dimensional array; the partial discharge measurement software determines signal filtering conditions according to the second two-dimensional array; the partial discharge detector determines a target pulse waveform which accords with the signal filtering condition according to the signal filtering condition and the first two-dimensional array; and finally, the user confirms whether the partial discharge pulse waveform exists when the cable is subjected to alternating-current withstand voltage. According to the invention, the phase spectrogram generated by the partial discharge measurement software can be used for setting signal filtering conditions, so that the corresponding discharge pulse signal can be accurately extracted, the accuracy of partial discharge signal identification is improved, and the partial discharge fault point can be found more conveniently.
Description
Technical Field
The invention relates to the technical field of cable testing, in particular to a method and a system for determining an alternating-current voltage-withstand partial discharge pulse waveform of a cable.
Background
With the rapid development of power networks and electricity utilization industry, new requirements are also put forward on the safe operation of the power networks and the electricity utilization; in particular, as for cables, their safe operation and maintenance are also inevitably and increasingly being regarded as important by the power system. The main cause of cable failure is deterioration and effect of insulation performance, and partial discharge is a main cause of deterioration of insulation performance of the cable.
In the prior art, the local discharge detection of the field cable has more interference, the real discharge pulse waveform is difficult to extract, and the current mainstream method is to set a voltage or electric quantity threshold value to filter the discharge pulse, but the method has difficulty in accurately extracting the corresponding discharge pulse signal under the condition that the interference signal is more or a plurality of discharge exists.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a method and a system for determining a cable alternating-current voltage-withstanding partial discharge pulse waveform, wherein the method can accurately extract a corresponding discharge pulse signal, thereby increasing the accuracy of partial discharge signal identification, reducing the difficulty of single-end positioning of a cable partial discharge signal and being more convenient for finding out a partial discharge fault point.
In a first aspect, the present invention provides a method for determining a cable ac voltage-withstanding partial discharge pulse waveform, the method comprising the steps of:
s1: the partial discharge detector collects synchronous signals and partial discharge signals in real time during cable alternating-current voltage-withstanding partial discharge test, and generates a first two-dimensional array A1[ Q ] [ phi ] according to the synchronous signals and the partial discharge signals;
s2: the partial discharge detector uploads the synchronous signal and the partial discharge signal during the cable alternating-current withstand voltage partial discharge test to the partial discharge measuring software, and the partial discharge measuring software generates a second two-dimensional array A2[ Q ] [ phi ] corresponding to the first two-dimensional array A1[ Q ] [ phi ];
s3: the partial discharge measurement software determines a signal filtering condition according to the second two-dimensional array A2[ Q ] [ phi ];
s4: the partial discharge detector determines a target pulse waveform which accords with the signal filtering condition according to the signal filtering condition and the first two-dimensional array A1[ Q ] [ phi ];
s5: the user confirms whether the partial discharge pulse waveform exists when the cable is in alternating current withstand voltage according to the target pulse waveform.
Further, the step S1, the partial discharge detector collects the synchronization signal and the partial discharge signal in real time during the cable ac voltage withstanding partial discharge test, and generates a first two-dimensional array A1[ Q ] [ Φ ] according to the synchronization signal and the partial discharge signal, specifically includes the steps of:
s11: simultaneously acquiring synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time;
s12, calculating a time accumulation counter T value of a zero crossing point of a synchronous signal, wherein the zero crossing points are marked as Z1, Z2 and Z3 … … Zn in sequence, Z1 is a time accumulation counter value of a first zero crossing point, Z2 is a time accumulation counter value of a second zero crossing point, and the like, and Zn is a time accumulation counter value of an nth zero crossing point;
s13: calculating the maximum discharge Q value and the corresponding time accumulation counter T value of the partial discharge signals in all dead time, wherein the maximum discharge Q value and the corresponding time accumulation counter T value are marked as A1[ Q1] [ T1], A1[ Q2] [ T2], A1[ Q3] [ T3] … A1[ Qn ] [ Tn ], A1[ Q1] [ T1] of the partial discharge signals in the first dead time, the maximum discharge Q value and the corresponding time accumulation counter T value of the partial discharge signals in the second dead time are marked as A1[ Qn ] [ Tn ] of the partial discharge signals in the nth dead time, and the maximum discharge Q value and the corresponding time accumulation counter T value of the partial discharge signals in the nth dead time are marked as follows;
s14: calculating a difference value between a time accumulation counter Tn corresponding to the partial discharge signal Qn and the current Zn to obtain a phase value phin of the partial discharge signal Qn, phi1=T1-Z1, phi2=T2-Z2 and the like, wherein phin=Tn-Zn, so as to obtain a first two-dimensional array A1[ Q ] [ phi ];
wherein n is a natural number greater than 1.
Further, in the step S12, a 64bits time accumulation counter is used to calculate a time accumulation counter T value of the zero crossing point of the synchronization signal;
in the step S13, a time accumulation counter T corresponding to the maximum discharge Q value of the partial discharge signal in the dead time is calculated by using a 64bits time accumulation counter.
Further, the step S3 specifically includes the following steps:
s31: drawing a second two-dimensional array A2[ Q ] [ phi ] into a phase spectrogram in partial discharge measurement software;
s32: and setting drawing window information according to the phase spectrogram in the partial discharge measurement software by a user, and determining signal filtering conditions according to the drawing window information by the partial discharge measurement software.
Further, the step S32 specifically includes:
s321: the user draws a window on a phase spectrogram of the partial discharge measurement software, and the partial discharge measurement software determines a maximum discharge signal, a minimum discharge signal, a maximum phase signal and a minimum phase signal according to the window drawing information;
s322: and converting the maximum discharge signal, the minimum discharge signal, the maximum phase signal and the minimum phase signal into 2 two-dimensional arrays A2[ Qmin ] [ Qmax ], A2[ Φmin ] [ Φmax ], and taking the maximum discharge signal, the minimum discharge signal, the maximum phase signal and the minimum phase signal as signal filtering conditions.
Further, in the step S4, determining, according to the signal filtering condition and the first two-dimensional array A1[ Q ] [ Φ ], a target pulse waveform that meets the signal filtering condition specifically includes:
s4.1: the partial discharge detector determines a discharge value Qn and a phase value phin according to the first two-dimensional array A1[ Q ] [ phi ];
s4.2: judging whether the discharge value Qn and the phase value phin meet the signal filtering condition, and if the discharge value Qn and the phase value phin meet the signal filtering condition, determining a pulse waveform corresponding to the uploading discharge value Qn;
and S4.3, screening out pulse waveforms meeting signal filtering conditions by the partial discharge detector, and determining the pulse waveforms as target pulse waveforms.
In a second aspect, as shown in fig. 3, the present invention provides a system for determining a cable ac voltage-withstanding partial discharge pulse waveform, where the system includes a partial discharge detector and a partial discharge measurement software, the partial discharge detector includes an acquisition unit, a first transmission unit and a first receiving unit;
the acquisition unit is used for simultaneously acquiring synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time, and generating a first two-dimensional array A1[ Q ] [ phi ];
the first transmission unit is respectively connected with the acquisition unit and the partial discharge measuring software and is used for uploading the synchronous signal and the partial discharge signal during the cable alternating-current voltage-withstanding partial discharge test to the partial discharge measuring software;
the partial discharge measurement software is used for generating a second two-dimensional array A2[ Q ] [ phi ] corresponding to the first two-dimensional array A1[ Q ] [ phi ], and determining signal filtering conditions according to the second two-dimensional array A2[ Q ] [ phi ];
the first receiving unit is respectively connected with the acquisition unit and the partial discharge measuring software and is used for receiving the signal filtering condition and the first two-dimensional array A1[ Q ] [ phi ] and determining a target pulse waveform which accords with the signal filtering condition according to the signal filtering condition and the first two-dimensional array A1[ Q ] [ phi ];
the partial discharge measurement software is also used for confirming whether the partial discharge pulse waveform exists when the cable alternating current withstand voltage is determined according to the target pulse waveform.
Further, the acquisition unit comprises:
the acquisition module is used for simultaneously acquiring synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time;
the first calculation module is connected with the acquisition module and is used for calculating the T value of a time accumulation counter of a zero crossing point of the synchronous signal, wherein the zero crossing points are sequentially marked as Z1, Z2 and Z3 … … Zn, Z1 is the time accumulation counter value of the first zero crossing point, Z2 is the time accumulation counter value of the second zero crossing point, and so on, and Zn is the time accumulation counter value of the nth zero crossing point;
the second calculation module is connected with the acquisition module and used for calculating the maximum discharge Q value of the partial discharge signals in all dead time and the corresponding time accumulation counter T value, wherein the maximum discharge Q value of the partial discharge signals in all dead time and the corresponding time accumulation counter T value are marked as A1[ Q1] [ T1], A1[ Q2] [ T2], A1[ Q3] [ T3] … A1[ Qn ] [ Tn ], A1[ Q1] [ T1] are the maximum discharge Q value of the partial discharge signals in the first dead time and the corresponding time accumulation counter T value, A1[ Q2] [ T2] is the maximum discharge Q value of the partial discharge signals in the second dead time and the corresponding time accumulation counter T value, and the like, and A1[ Qn ] [ Tn ] is the maximum discharge Q value of the partial discharge signals in the nth dead time and the corresponding time accumulation counter T value;
the third calculation module is respectively connected with the first calculation module and the second calculation module, calculates the difference value between the time accumulation counter Tn corresponding to the partial discharge signal Qn and the current Zn to obtain a phase value phi n of the partial discharge signal Qn, phi 1 = T1-Z1, phi 2 = T2-Z2 and the like, wherein phi n = Tn-Zn, so as to obtain a first two-dimensional array A1[ Q ] [ phi ];
wherein n is a natural number greater than 1.
Further, the first calculating module comprises a time accumulation counter, wherein the time accumulation counter is a 64bits time accumulation counter and is used for calculating a time accumulation counter T value of a synchronous signal zero crossing point and a time accumulation counter T value corresponding to a maximum discharge Q value of a partial discharge signal in dead time.
In a third aspect, the present invention provides a cable ac voltage withstanding partial discharge test analysis method, which specifically includes the steps of:
by adopting the method for determining the cable alternating-current withstand voltage partial discharge pulse waveform, whether the partial discharge pulse waveform exists when the cable alternating-current withstand voltage exists or not is determined;
and testing and analyzing the cable alternating-current voltage-withstand partial discharge according to the cable alternating-current voltage-withstand partial discharge pulse waveform.
The beneficial effects realized by the invention are as follows:
according to the invention, the pulse waveform is selected in a phase spectrogram window selection mode, so that the discharge pulse waveform in any discharge phase and discharge quantity range can be determined according to the test or analysis requirements, and the problem that the corresponding discharge pulse signal is difficult to accurately extract under the condition of multiple interference signals or multiple discharge types is solved;
the invention is beneficial to the inspector to select and determine the discharge pulse waveform according to the discharge phase information on the phase spectrogram, and can accurately extract the corresponding discharge pulse signal by setting the signal filtering condition through the phase spectrogram generated by the partial discharge measurement software, thereby increasing the accuracy of partial discharge signal identification and being more convenient for finding out the partial discharge fault point.
Drawings
FIG. 1 is a flow chart of determining a cable AC withstand voltage partial discharge pulse waveform in an embodiment of the invention;
FIG. 2 is a schematic diagram of 2 two-dimensional arrays A2[ Qmin ] [ Qmax ], A2[ Φmin ] [ Φmax ] in an embodiment of the present invention;
fig. 3 is a system for determining a cable ac voltage withstand partial discharge pulse waveform in an embodiment of the present invention.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.
It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention, and are not limiting of the invention.
It is to be understood that the various embodiments of the invention and the features of the embodiments may be combined with each other without conflict.
It is to be understood that only the portions relevant to the present invention are shown in the drawings for convenience of description, and the portions irrelevant to the present invention are not shown in the drawings.
It should be understood that each unit and module in the embodiments of the present invention may correspond to only one physical structure, may be formed by a plurality of physical structures, or may be integrated into one physical structure.
It will be appreciated that, without conflict, the functions and steps noted in the flowcharts and block diagrams of the present invention may occur out of the order noted in the figures.
It is to be understood that the flowcharts and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatuses, devices, methods according to various embodiments of the present invention. Where each block in the flowchart or block diagrams may represent a unit, module, segment, code, or the like, which comprises executable instructions for implementing the specified functions. Moreover, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by hardware-based systems that perform the specified functions, or by combinations of hardware and computer instructions.
It should be understood that the units and modules related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.
Example 1:
as shown in fig. 1, the embodiment provides a method for determining a cable ac voltage-withstanding partial discharge pulse waveform, which includes the steps of:
s1: the method comprises the steps of collecting synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time, and generating a first two-dimensional array A1[ Q ] [ phi ];
specifically, the step S1 is implemented by a partial discharge detector, the cable is a three-phase cable (a/B/C three-phase) connector, and the method of this embodiment is exemplified by a phase a, but is applicable to both a phase B and a phase C.
The method comprises the following specific steps:
s11: the partial discharge detector collects synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time;
when the electric equipment generates partial discharge, electromagnetic waves are generated, and when the electromagnetic waves propagate outwards, a transient voltage signal to ground is generated. The magnitude of this signal is directly related to the severity of the partial discharge and the distance of the discharge point. The detection may be performed using a partial discharge detector (i.e., a partial discharge detector).
S12, calculating a time accumulation counter T value of a zero crossing point of a synchronous signal by the partial discharge detector, wherein the zero crossing points are sequentially marked as Z1, Z2 and Z3 … … Zn, Z1 is a time accumulation counter value of a first zero crossing point, Z2 is a time accumulation counter value of a second zero crossing point, and the like, and Zn is a time accumulation counter value of an nth zero crossing point;
the T value of a time accumulation counter for calculating the zero crossing point of the synchronous signal is a 64-bit time accumulation counter; a 128bits time increment counter may also be used.
S13: the partial discharge detector calculates the maximum discharge Q value of the partial discharge signal in all dead time and the corresponding time accumulation counter T value, and is marked as A1[ Q1] [ T1], A1[ Q2] [ T2], A1[ Q3] [ T3] … A1[ Qn ] [ Tn ], A1[ Q1] [ T1] is the maximum discharge Q value of the partial discharge signal in the first dead time and the corresponding time accumulation counter T value, A1[ Q2] [ T2] is the maximum discharge Q value of the partial discharge signal in the second dead time and the corresponding time accumulation counter T value, and so on, and A1[ Qn ] [ Tn ] is the maximum discharge Q value of the partial discharge signal in the nth dead time and the corresponding time accumulation counter T value;
in step S12, a 64bits time accumulation counter is adopted to calculate the T value of the time accumulation counter of the zero crossing point of the synchronous signal; in step S13, a 64bits time accumulation counter is used to calculate a time accumulation counter T corresponding to the maximum discharge Q value of the partial discharge signal in the dead time.
S14: the partial discharge detector calculates the difference value between a time accumulation counter Tn corresponding to the partial discharge signal Qn and the current Zn to obtain a phase value phin of the partial discharge signal Qn, phi1=T1-Z1, phi2=T2-Z2 and the like, wherein phin=Tn-Zn, so that a first two-dimensional array A1[ Q ] [ phi ];
wherein n is a natural number greater than 1.
S2: the partial discharge detector uploads the synchronous signal and the partial discharge signal during the cable alternating-current withstand voltage partial discharge test to the partial discharge measuring software, and the partial discharge measuring software generates a second two-dimensional array A2[ Q ] [ phi ] corresponding to the first two-dimensional array A1[ Q ] [ phi ];
s3: the partial discharge measurement software determines a signal filtering condition according to the second two-dimensional array A2[ Q ] [ phi ];
specifically, the step S3 specifically includes the following steps:
s31: drawing a second two-dimensional array A2[ Q ] [ phi ] into a phase spectrogram in partial discharge measurement software;
the phase spectrogram is formed by all second two-dimensional arrays, and the second two-dimensional arrays are synchronous signals and partial discharge signals corresponding to the first two-dimensional arrays.
S32: and setting drawing window information according to the phase spectrogram in the partial discharge measurement software by a user, and determining signal filtering conditions according to the drawing window information by the partial discharge measurement software.
The window drawing information is drawn in the partial discharge measuring software by engineering technicians or users according to the detection requirement.
More specifically, this step S32 specifically includes:
s321: the user draws a window on a phase spectrogram of the partial discharge measurement software, and the partial discharge measurement software determines a maximum discharge signal, a minimum discharge signal, a maximum phase signal and a minimum phase signal according to the window drawing information;
s322: the partial discharge measurement software converts the maximum discharge signal, the minimum discharge signal, the maximum phase signal and the minimum phase signal into 2 two-dimensional arrays A2[ Qmin ] [ Qmax ], A2[ Φmin ] [ Φmax ], and takes the maximum discharge signal, the minimum discharge signal, the maximum phase signal and the minimum phase signal as signal filtering conditions;
s323: the partial discharge detector receives the signal filtering condition issued by the partial discharge measuring software.
S4: the partial discharge detector determines a target pulse waveform which accords with the signal filtering condition according to the signal filtering condition and the first two-dimensional array A1[ Q ] [ phi ].
Specifically, in the step S4, a target pulse waveform conforming to the signal filtering condition is determined according to the signal filtering condition and the first two-dimensional array A1[ Q ] [ Φ ], which specifically includes:
s4.1: the partial discharge detector determines a discharge value Qn and a phase value phin according to the first two-dimensional array A1[ Q ] [ phi ];
s4.2: judging whether the discharge value Qn and the phase value phin meet the signal filtering condition, and if the discharge value Qn and the phase value phin meet the signal filtering condition, determining a pulse waveform corresponding to the uploading discharge value Qn;
and S4.3, screening out pulse waveforms meeting signal filtering conditions by the partial discharge detector, and determining the pulse waveforms as target pulse waveforms.
S5: the user confirms whether the partial discharge pulse waveform exists when the cable is in alternating current withstand voltage according to the target pulse waveform.
Example 2:
as shown in fig. 3, the embodiment provides a system for determining a cable ac voltage-withstanding partial discharge pulse waveform, where the system includes a partial discharge detector and a partial discharge measurement software, and the partial discharge detector includes an acquisition unit, a first transmission unit and a first receiving unit;
the acquisition unit is used for simultaneously acquiring synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time, and generating a first two-dimensional array A1[ Q ] [ phi ];
the first transmission unit is respectively connected with the acquisition unit and the partial discharge measuring software and is used for uploading the first two-dimensional array A1[ Q ] [ phi ] to the partial discharge measuring software;
the partial discharge measurement software is used for generating a second two-dimensional array A2[ Q ] [ phi ] corresponding to the first two-dimensional array A1[ Q ] [ phi ], and determining signal filtering conditions according to the second two-dimensional array A2[ Q ] [ phi ];
the first receiving unit is connected with the acquisition unit and the partial discharge measuring software respectively and is used for determining a target pulse waveform according to signal filtering conditions and the first two-dimensional array A1[ Q ] [ phi ], and uploading the target pulse waveform to the partial discharge measuring software so as to enable the partial discharge measuring software to determine whether the partial discharge pulse waveform exists when the cable is in alternating-current withstand voltage.
Specifically, the acquisition unit includes:
the acquisition module is used for simultaneously acquiring synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time;
the first calculation module is connected with the acquisition module and is used for calculating the T value of a time accumulation counter of a zero crossing point of the synchronous signal, wherein the zero crossing points are sequentially marked as Z1, Z2 and Z3 … … Zn, Z1 is the time accumulation counter value of the first zero crossing point, Z2 is the time accumulation counter value of the second zero crossing point, and the like, and Zn is the time accumulation counter value of the nth zero crossing point;
the second calculation module is connected with the acquisition module and used for calculating the maximum discharge Q value of the partial discharge signals in all dead time and the corresponding time accumulation counter T value, wherein the maximum discharge Q value of the partial discharge signals in all dead time and the corresponding time accumulation counter T value are marked as A1[ Q1] [ T1], A1[ Q2] [ T2], A1[ Q3] [ T3] … A1[ Qn ] [ Tn ], A1[ Q1] [ T1] are the maximum discharge Q value of the partial discharge signals in the first dead time and the corresponding time accumulation counter T value, A1[ Q2] [ T2] is the maximum discharge Q value of the partial discharge signals in the second dead time and the corresponding time accumulation counter T value, and so on, and A1[ Qn ] [ Tn ] is the maximum discharge Q value of the partial discharge signals in the nth dead time and the corresponding time accumulation counter T value;
the third calculation module is respectively connected with the first calculation module and the second calculation module, calculates the difference value between the time accumulation counter Tn corresponding to the partial discharge signal Qn and the current Zn to obtain a phase value phin of the partial discharge signal Qn, phi1=T1-Z1, phi2=T2-Z2 and the like, wherein phin=Tn-Zn, so that a first two-dimensional group A1[ Q ] [ phi ] is obtained;
wherein n is a natural number greater than 1.
Specifically, the first calculating module includes a time accumulation counter, where the time accumulation counter is a 64bits time accumulation counter, and is configured to calculate a time accumulation counter T value of a zero crossing point of the synchronization signal and a time accumulation counter T value corresponding to a maximum discharge Q value of the partial discharge signal in dead time.
The procedure of the method implemented in embodiment 2 is the same as that in embodiment 1, and for the same content, description is not repeated.
In the embodiment 1 and the embodiment 2, the pulse waveforms are selected in a phase spectrogram window selection mode, so that the discharge pulse waveforms in any discharge phase and discharge quantity range can be determined according to the test or analysis requirements, and the problem that the corresponding discharge pulse signals are difficult to accurately extract under the condition of multiple interference signals or multiple discharge types is solved;
the embodiment 1 and the embodiment 2 are beneficial to the detection personnel to select and determine the discharge pulse waveform according to the discharge phase information on the phase spectrogram in a targeted manner, the corresponding discharge pulse signal can be accurately extracted by setting the signal filtering condition through the phase spectrogram generated by the partial discharge measurement software, and the accuracy of the partial discharge signal identification is improved, so that the partial discharge fault point can be more conveniently found.
The partial discharge measuring software of the embodiment 1 and the embodiment 2 are professional partial discharge measuring software, the partial discharge measuring software is matched with a partial discharge instrument to be used, and each partial discharge equipment manufacturer has own partial discharge measuring software. The partial discharge measuring software can be installed on a computer host, and comprises signal phase calculation, peak value statistics, anti-interference, discharge spectrum extraction and generation, diagnosis, discharge information storage and management and the like, and the phase spectrum and the detection result after analysis can be seen on the software.
Example 3:
based on the same technical concept as embodiment 1, the present embodiment provides a cable ac voltage withstanding partial discharge test analysis method, which specifically includes the steps of:
determining whether a partial discharge pulse waveform exists when the cable alternating current voltage is withstand by adopting the method for determining the cable alternating current voltage withstand partial discharge pulse waveform described in the embodiment 1;
and analyzing the cable alternating-current voltage-withstand partial discharge test according to the cable alternating-current voltage-withstand partial discharge pulse waveform.
In the embodiment, the cable alternating current voltage-withstand partial discharge pulse waveform is determined first, and then the partial discharge signal of the cable is judged according to the cable alternating current voltage-withstand partial discharge pulse waveform, so that the basis of the cable alternating current voltage-withstand partial discharge judgment is improved, and the cable alternating current voltage-withstand partial discharge can be accurately tested and analyzed.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (10)
1. The method for determining the cable alternating-current voltage-withstanding partial discharge pulse waveform is characterized by comprising the following steps of:
s1: the partial discharge detector collects synchronous signals and partial discharge signals in real time during cable alternating-current voltage-withstanding partial discharge test, and generates a first two-dimensional array A1[ Q ] [ phi ] according to the synchronous signals and the partial discharge signals;
s2: the partial discharge detector uploads the synchronous signal and the partial discharge signal during the cable alternating-current withstand voltage partial discharge test to the partial discharge measuring software, and the partial discharge measuring software generates a second two-dimensional array A2[ Q ] [ phi ] corresponding to the first two-dimensional array A1[ Q ] [ phi ];
s3: the partial discharge measurement software determines a signal filtering condition according to the second two-dimensional array A2[ Q ] [ phi ];
s4: the partial discharge detector determines a target pulse waveform which accords with the signal filtering condition according to the signal filtering condition and the first two-dimensional array A1[ Q ] [ phi ];
s5: the user confirms whether the partial discharge pulse waveform exists when the cable is in alternating current withstand voltage according to the target pulse waveform.
2. The method for determining a cable AC withstand voltage partial discharge pulse waveform according to claim 1, characterized in that,
step S1, the partial discharge detector collects synchronous signals and partial discharge signals in real time during cable alternating current voltage withstand partial discharge test, and generates a first two-dimensional array A1[ Q ] [ phi ] according to the synchronous signals and the partial discharge signals, specifically comprising the steps of:
s11: simultaneously acquiring synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time;
s12, calculating a time accumulation counter T value of a zero crossing point of a synchronous signal, wherein the zero crossing points are marked as Z1, Z2 and Z3 … … Zn in sequence, Z1 is a time accumulation counter value of a first zero crossing point, Z2 is a time accumulation counter value of a second zero crossing point, and the like, and Zn is a time accumulation counter value of an nth zero crossing point;
s13: calculating the maximum discharge Q value and the corresponding time accumulation counter T value of the partial discharge signals in all dead time, wherein the maximum discharge Q value and the corresponding time accumulation counter T value are marked as A1[ Q1] [ T1], A1[ Q2] [ T2], A1[ Q3] [ T3] … A1[ Qn ] [ Tn ], A1[ Q1] [ T1] of the partial discharge signals in the first dead time, the maximum discharge Q value and the corresponding time accumulation counter T value of the partial discharge signals in the second dead time are marked as A1[ Qn ] [ Tn ] of the partial discharge signals in the nth dead time, and the maximum discharge Q value and the corresponding time accumulation counter T value of the partial discharge signals in the nth dead time are marked as follows;
s14: calculating a difference value between a time accumulation counter Tn corresponding to the partial discharge signal Qn and the current Zn to obtain a phase value phin of the partial discharge signal Qn, phi1=T1-Z1, phi2=T2-Z2 and the like, wherein phin=Tn-Zn, so as to obtain a first two-dimensional array A1[ Q ] [ phi ];
wherein n is a natural number greater than 1.
3. The method for determining a cable AC withstand voltage partial discharge pulse waveform according to claim 2, characterized in that,
in the step S12, a 64bits time accumulation counter is adopted to calculate the time accumulation counter T value of the zero crossing point of the synchronous signal;
in the step S13, a time accumulation counter T corresponding to the maximum discharge Q value of the partial discharge signal in the dead time is calculated by using a 64bits time accumulation counter.
4. A method for determining a cable AC withstand voltage partial discharge pulse waveform according to any one of claims 1 to 3, characterized in that,
the step S3 specifically comprises the following steps:
s31: drawing a second two-dimensional array A2[ Q ] [ phi ] into a phase spectrogram in partial discharge measurement software;
s32: and setting drawing window information according to the phase spectrogram in the partial discharge measurement software by a user, and determining signal filtering conditions according to the drawing window information by the partial discharge measurement software.
5. The method for determining a cable AC withstand voltage partial discharge pulse waveform according to claim 4, wherein,
the step S32 specifically includes:
s321: the user draws a window on a phase spectrogram of the partial discharge measurement software, and the partial discharge measurement software determines a maximum discharge signal, a minimum discharge signal, a maximum phase signal and a minimum phase signal according to the window drawing information;
s322: the partial discharge measurement software converts the maximum discharge signal, the minimum discharge signal, the maximum phase signal and the minimum phase signal into 2 two-dimensional arrays A2[ Qmin ] [ Qmax ], A2[ Φmin ] [ Φmax ], and takes the maximum discharge signal, the minimum discharge signal, the maximum phase signal and the minimum phase signal as signal filtering conditions.
6. The method for determining a cable AC withstand voltage partial discharge pulse waveform according to claim 1, characterized in that,
in the step S4, determining a target pulse waveform according to the signal filtering condition and the first two-dimensional array A1[ Q ] [ Φ ], specifically includes:
s4.1: the partial discharge detector determines a discharge value Qn and a phase value phin according to the first two-dimensional array A1[ Q ] [ phi ];
s4.2: judging whether the discharge value Qn and the phase value phin meet the signal filtering condition, and if the discharge value Qn and the phase value phin meet the signal filtering condition, determining a pulse waveform corresponding to the uploading discharge value Qn;
and S4.3, screening out pulse waveforms meeting signal filtering conditions by the partial discharge detector, and determining the pulse waveforms as target pulse waveforms.
7. The system for determining the cable alternating-current withstand voltage partial discharge pulse waveform is characterized by comprising a partial discharge detector and partial discharge measuring software, wherein the partial discharge detector comprises an acquisition unit, a first transmission unit and a first receiving unit;
the acquisition unit is used for simultaneously acquiring synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time, and generating a first two-dimensional array A1[ Q ] [ phi ];
the first transmission unit is respectively connected with the acquisition unit and the partial discharge measuring software and is used for uploading the synchronous signal and the partial discharge signal during the cable alternating-current voltage-withstanding partial discharge test to the partial discharge measuring software;
the partial discharge measurement software is used for generating a second two-dimensional array A2[ Q ] [ phi ] corresponding to the first two-dimensional array A1[ Q ] [ phi ], and determining signal filtering conditions according to the second two-dimensional array A2[ Q ] [ phi ];
the first receiving unit is respectively connected with the acquisition unit and the partial discharge measuring software and is used for receiving the signal filtering condition and the first two-dimensional array A1[ Q ] [ phi ] and determining a target pulse waveform which accords with the signal filtering condition according to the signal filtering condition and the first two-dimensional array A1[ Q ] [ phi ];
the partial discharge measurement software is also used for confirming whether the partial discharge pulse waveform exists when the cable alternating current withstand voltage is determined according to the target pulse waveform.
8. The system for determining the waveform of a cable ac voltage-withstand partial discharge pulse according to claim 7, wherein,
the acquisition unit comprises:
the acquisition module is used for simultaneously acquiring synchronous signals and partial discharge signals in the cable alternating-current voltage-withstanding partial discharge test in real time;
the first calculation module is connected with the acquisition module and is used for calculating the T value of a time accumulation counter of a zero crossing point of the synchronous signal, wherein the zero crossing points are sequentially marked as Z1, Z2 and Z3 … … Zn, Z1 is the time accumulation counter value of the first zero crossing point, Z2 is the time accumulation counter value of the second zero crossing point, and so on, and Zn is the time accumulation counter value of the nth zero crossing point;
the second calculation module is connected with the acquisition module and used for calculating the maximum discharge Q value of the partial discharge signals in all dead time and the corresponding time accumulation counter T value, wherein the maximum discharge Q value of the partial discharge signals in all dead time and the corresponding time accumulation counter T value are marked as A1[ Q1] [ T1], A1[ Q2] [ T2], A1[ Q3] [ T3] … A1[ Qn ] [ Tn ], A1[ Q1] [ T1] are the maximum discharge Q value of the partial discharge signals in the first dead time and the corresponding time accumulation counter T value, A1[ Q2] [ T2] is the maximum discharge Q value of the partial discharge signals in the second dead time and the corresponding time accumulation counter T value, and the like, and A1[ Qn ] [ Tn ] is the maximum discharge Q value of the partial discharge signals in the nth dead time and the corresponding time accumulation counter T value;
the third calculation module is respectively connected with the first calculation module and the second calculation module, calculates the difference value between the time accumulation counter Tn corresponding to the partial discharge signal Qn and the current Zn to obtain a phase value phi n of the partial discharge signal Qn, phi 1 = T1-Z1, phi 2 = T2-Z2 and the like, wherein phi n = Tn-Zn, so as to obtain a first two-dimensional array A1[ Q ] [ phi ];
wherein n is a natural number greater than 1.
9. The system for determining the waveform of a cable ac voltage-withstand partial discharge pulse according to claim 8, wherein,
the first calculation module comprises a time accumulation counter, wherein the time accumulation counter is a 64-bit time accumulation counter and is used for calculating a time accumulation counter T value of a synchronous signal zero crossing point and a time accumulation counter T value corresponding to a maximum discharge Q value of a partial discharge signal in dead time.
10. The cable alternating current voltage withstand partial discharge test analysis method is characterized by comprising the following steps of:
determining whether a partial discharge pulse waveform exists when the cable alternating current voltage is withstand by adopting the method for determining the cable alternating current voltage withstand partial discharge pulse waveform according to any one of claims 1 to 6;
and testing and analyzing the cable alternating-current voltage-withstand partial discharge according to the cable alternating-current voltage-withstand partial discharge pulse waveform.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001264378A (en) * | 2000-03-17 | 2001-09-26 | Mitsubishi Electric Corp | Measuring method for partial discharge of electric rotating machine |
| US6809523B1 (en) * | 1998-10-16 | 2004-10-26 | The Detroit Edison Company | On-line detection of partial discharge in electrical power systems |
| US20130179100A1 (en) * | 2012-01-11 | 2013-07-11 | Utilx Corporation | System for analyzing and locating partial discharges |
| WO2015070513A1 (en) * | 2013-11-14 | 2015-05-21 | 国家电网公司 | Pattern recognition method for partial discharge of three-phase in one enclosure type ultrahigh voltage gis |
| US20180252759A1 (en) * | 2015-03-25 | 2018-09-06 | Pdp-Technologies Ltd | System for Detecting Electromagnetic Discharge Fields |
| CN108896879A (en) * | 2018-05-15 | 2018-11-27 | 国网江苏省电力有限公司电力科学研究院 | Diagnosis atlas phase windowing parameter regulation means based on local discharge signal feature |
| CN112147445A (en) * | 2020-09-25 | 2020-12-29 | 北京神州泰岳软件股份有限公司 | Partial discharge detection method and system |
-
2023
- 2023-02-07 CN CN202310094215.3A patent/CN117092458A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6809523B1 (en) * | 1998-10-16 | 2004-10-26 | The Detroit Edison Company | On-line detection of partial discharge in electrical power systems |
| JP2001264378A (en) * | 2000-03-17 | 2001-09-26 | Mitsubishi Electric Corp | Measuring method for partial discharge of electric rotating machine |
| US20130179100A1 (en) * | 2012-01-11 | 2013-07-11 | Utilx Corporation | System for analyzing and locating partial discharges |
| WO2015070513A1 (en) * | 2013-11-14 | 2015-05-21 | 国家电网公司 | Pattern recognition method for partial discharge of three-phase in one enclosure type ultrahigh voltage gis |
| US20180252759A1 (en) * | 2015-03-25 | 2018-09-06 | Pdp-Technologies Ltd | System for Detecting Electromagnetic Discharge Fields |
| CN108896879A (en) * | 2018-05-15 | 2018-11-27 | 国网江苏省电力有限公司电力科学研究院 | Diagnosis atlas phase windowing parameter regulation means based on local discharge signal feature |
| CN112147445A (en) * | 2020-09-25 | 2020-12-29 | 北京神州泰岳软件股份有限公司 | Partial discharge detection method and system |
Non-Patent Citations (2)
| Title |
|---|
| LIANG QI 等: "Design of Partial Discharge Detection System for High Voltage Electrical Equipment Based on Intelligent Video Detection Algorithm", 《INNOVATIVE COMPUTING》, 4 January 2022 (2022-01-04), pages 133 - 139 * |
| 邓鸿岳 等: "交流局部放电宽带检测与分析仪的研制", 《高压电器》, vol. 47, no. 3, 31 March 2011 (2011-03-31), pages 18 - 25 * |
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