CN113219310A

CN113219310A - Partial discharge positioning method, device, positioning equipment and storage medium

Info

Publication number: CN113219310A
Application number: CN202110438958.9A
Authority: CN
Inventors: 卢旭; 王圣; 魏欢; 田杰
Original assignee: Shenzhen Power Supply Co ltd
Current assignee: Shenzhen Power Supply Co ltd
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2021-08-06
Anticipated expiration: 2041-04-23
Also published as: CN113219310B

Abstract

The application relates to a partial discharge positioning method, a partial discharge positioning device, a positioning device and a storage medium, which are applicable to the technical field of power systems. The method comprises the following steps: determining a pulse signal with an amplitude larger than a first preset amplitude threshold value as a direct pulse signal in the received pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal, and determining the primary reflection pulse signal in the second receiving time window according to the amplitude value; and determining the position of the discharge point in the target cable according to the receiving moments of the direct pulse signal, the primary reflected pulse signal and the secondary reflected pulse signal. By adopting the method, the accuracy of the calculated position of the partial discharge can be improved.

Description

Partial discharge positioning method, device, positioning equipment and storage medium

Technical Field

The present disclosure relates to the field of power systems, and in particular, to a method and an apparatus for locating partial discharge, a locating device, and a storage medium.

Background

The partial discharge test is one of the main items of the cable test, and the partial discharge positioning technology is an important link in the partial discharge test. The purpose of the partial discharge positioning is to accurately find out the position of a partial discharge point, so that the reason of the partial discharge is conveniently found out, measures are taken, and finally the defect of the partial discharge is thoroughly eliminated, so that the quality and the economic benefit of the cable are improved.

The current common partial discharge positioning method is a time domain reflection method, partial discharge detection impedance is installed on a grounding wire at the near end of a cable to perform synchronous coupling acquisition of partial discharge signals, and acquired pulse signals are accessed into an oscilloscope to be displayed. And manually calculating the position of partial discharge according to the acquisition time corresponding to the direct pulse signal, the primary reflected pulse signal and the secondary reflected pulse signal displayed by the oscilloscope and the length of the cable. Specifically, one end of the cable, which is connected into the oscilloscope, is set as a first end of the cable, and one end, which is far away from the oscilloscope, is set as a second end, and if a discharge point is arranged at a position which is X-length away from the second end of the cable, the discharge point simultaneously emits two pulses to two ends of the cable, and the direct pulse signal represents a pulse signal which is emitted from the discharge point and is directly transmitted to the first end; the primary reflection pulse signal represents a pulse signal which is emitted from the discharge point, transmitted to the second end firstly, reflected for the first time and transmitted to the first end; the secondary reflection pulse signal represents the pulse signal which is transmitted to the second end through primary reflection after the direct pulse signal reaches the first end, and then is transmitted to the first end again through the primary reflection.

According to the method, the acquisition time of the pulse signal is determined manually, and manual calculation is required, so that the position of the partial discharge obtained through final calculation is inaccurate.

Disclosure of Invention

In view of the above, it is necessary to provide a partial discharge positioning method, a partial discharge positioning apparatus, a positioning device, and a storage medium, which can improve the accuracy of the calculated partial discharge position.

In a first aspect, a partial discharge positioning method is provided, which is used in a positioning device connected to a target cable, and includes: after the sinusoidal voltage is applied to the target cable, receiving a pulse signal emitted by a discharge point in the target cable under the excitation of the sinusoidal voltage; determining a pulse signal with an amplitude larger than a first preset amplitude threshold value as a direct pulse signal in the received pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; the standard transmission duration represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable; determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal, and determining the primary reflection pulse signal in the second receiving time window according to the amplitude value; and determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

In one embodiment, the method further comprises: acquiring a synchronous voltage signal corresponding to the sinusoidal voltage, and determining the period of the sinusoidal voltage according to the synchronous voltage signal; correspondingly, determining the pulse signal with the amplitude larger than the first preset amplitude threshold value as a direct pulse signal comprises the following steps: determining pulse signals with amplitude values larger than a first preset amplitude threshold value as direct pulse signals in each period of the sine voltage; correspondingly, determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude larger than a second preset amplitude threshold value in the first receiving time window as a secondary reflection pulse signal, including: determining each first receiving time window according to the receiving time and the standard transmission duration of each direct pulse signal, and determining the pulse signals with the amplitude values larger than a second preset amplitude value threshold value in each first receiving time window as each secondary reflection pulse signal; correspondingly, determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determining the primary reflected pulse signal according to the amplitude of the pulse signal in the second receiving time window, including: and determining each second receiving time window according to the receiving time of each direct pulse signal and the receiving time of each secondary reflected pulse signal, and determining each primary reflected pulse signal according to the amplitude of the pulse signal in each second receiving time window.

In one embodiment, determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal includes: determining the position information of the discharge point corresponding to each period in the target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period; and performing statistical processing on the position information to determine the range of the position of the discharge point in the target cable.

In one embodiment, statistically processing the position information to determine the range of the position of the discharge point in the target cable includes: acquiring position values corresponding to the position information; calculating the occurrence frequency of each position numerical value; and reserving the position values with the frequency larger than the preset frequency threshold value, and determining the range between the maximum value and the minimum value in the reserved position values as the range of the position of the discharge point in the target cable.

In one embodiment, determining the first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time comprises: after delaying the receiving time of the direct pulse signal by two standard transmission time lengths, determining the receiving time as a preset receiving time; and determining the duration between the preset time margins before and after the preset receiving time as a first receiving time window.

In one embodiment, the method further comprises, after delaying the receiving time of the direct pulse signal by two standard transmission durations, determining the receiving time to be before the preset receiving time, and: acquiring the length of a target cable; receiving a standard pulse signal transmitted from one end of an access positioning device and a primary reflected pulse signal corresponding to the standard pulse signal; and calculating to obtain the standard transmission time length based on the length of the target cable divided by the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal.

In one embodiment, determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determining the amplitude of the pulse signal in the second receiving time window to determine the primary reflected pulse signal includes: determining the time length between the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal as a second receiving time window; and determining the pulse signal with the amplitude smaller than the first preset amplitude threshold value and larger than the second preset amplitude threshold value in the second receiving time window as a primary reflection pulse signal.

In a second aspect, there is provided a partial discharge localization apparatus, the apparatus comprising:

the receiving module is used for receiving a pulse signal emitted by a discharge point in the target cable under the excitation of a sinusoidal voltage after the sinusoidal voltage is applied to the target cable;

the first determining module is used for determining the pulse signals with the amplitude values larger than a first preset amplitude threshold value as direct pulse signals in the received pulse signals;

the second determining module is used for determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; the standard transmission duration represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable;

the third determining module is used for determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal, and determining the primary reflection pulse signal according to the amplitude of the pulse signal in the second receiving time window;

and the fourth determining module is used for determining the position of the discharging point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

In one embodiment, the apparatus further comprises:

the acquisition module is used for acquiring a synchronous voltage signal corresponding to the sinusoidal voltage and determining the period of the sinusoidal voltage according to the synchronous voltage signal;

in a corresponding manner, the first and second electrodes are,

the first determining module is used for determining the pulse signal with the amplitude larger than a first preset amplitude threshold value as a direct pulse signal in each period of the sinusoidal voltage;

the second determining module is used for determining each first receiving time window according to the receiving time and the standard transmission duration of each direct pulse signal, and determining the pulse signals with the amplitude values larger than a second preset amplitude value threshold value in each first receiving time window as each secondary reflection pulse signal;

and the third determining module is used for determining each second receiving time window according to the receiving time of each direct pulse signal and the receiving time of each secondary reflected pulse signal, and determining each primary reflected pulse signal according to the amplitude of the pulse signal in each second receiving time window.

In one embodiment, the fourth determining module includes:

the first determining unit is used for determining the position information of the discharge point corresponding to each period in the target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period;

and the second determining unit is used for performing statistical processing on the position information and determining the range of the position of the discharge point in the target cable.

In one embodiment, the second determining unit is specifically configured to obtain a location value corresponding to each location information; calculating the occurrence frequency of each position numerical value; and reserving the position values with the frequency larger than the preset frequency threshold value, and determining the range between the maximum value and the minimum value in the reserved position values as the range of the position of the discharge point in the target cable.

In one embodiment, the second determining module includes:

a third determining unit, configured to determine the receiving time of the direct pulse signal as a preset receiving time after delaying the receiving time by two standard transmission durations;

and the fourth determining unit is used for determining the duration between the preset time margins before and after the preset receiving time as the first receiving time window.

In one embodiment, the second determining module further includes:

an acquisition unit configured to acquire a length of a target cable;

the receiving unit is used for receiving a standard pulse signal transmitted from one end of the access positioning equipment and a primary reflected pulse signal corresponding to the standard pulse signal;

and the calculating unit is used for calculating and obtaining the standard transmission time length based on the length of the target cable divided by the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflection pulse signal corresponding to the standard pulse signal.

In one embodiment, the third determining unit is specifically configured to determine a time duration between the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal as a second receiving time window; and determining the pulse signal with the amplitude smaller than the first preset amplitude threshold value and larger than the second preset amplitude threshold value in the second receiving time window as a primary reflection pulse signal.

In a third aspect, there is provided a positioning apparatus comprising a memory and a processor, the memory storing a computer program, the processor implementing the method according to any of the first aspect when executing the computer program.

In a fourth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method of any of the first aspects described above.

After a sinusoidal voltage is applied to a target cable, receiving a pulse signal emitted by a discharge point in the target cable under the excitation of the sinusoidal voltage; determining a pulse signal with an amplitude larger than a first preset amplitude threshold value as a direct pulse signal in the received pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; the standard transmission duration represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable; determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal, and determining the primary reflection pulse signal in the second receiving time window according to the amplitude value; and determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal. In the above method, the positioning device determines the direct pulse signal among the received pulse signals according to the principle that the amplitude of the pulse signal emitted when the discharge point is at the peak of the sinusoidal voltage is the largest. The positioning equipment determines first receiving time according to the receiving time of the direct pulse signal and the standard transmission time, and determines a secondary reflection pulse signal from the first receiving time according to the amplitude of the pulse signal. Then, the positioning device determines a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determines the primary reflected pulse signal from the second receiving time according to the amplitude of the pulse signal. Therefore, the accuracy of the receiving time of the determined direct pulse signal, the determined primary reflection pulse signal and the determined secondary reflection pulse signal is ensured. Therefore, the accuracy of the position of the discharge point in the target cable is determined according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

Drawings

FIG. 1 is a diagram of an exemplary embodiment of a partial discharge localization method;

FIG. 2 is a schematic flow chart diagram illustrating a partial discharge location method according to one embodiment;

FIG. 3 is a schematic flow chart of a partial discharge localization step in one embodiment;

FIG. 4 is a schematic flow chart diagram illustrating a partial discharge localization method according to another embodiment;

FIG. 5 is a schematic flow chart diagram illustrating a partial discharge localization method according to another embodiment;

FIG. 6 is a schematic flow chart diagram illustrating a partial discharge localization method according to another embodiment;

FIG. 7 is a flowchart illustrating a partial discharge localization method according to another embodiment;

FIG. 8 is a schematic flow chart diagram illustrating a partial discharge localization method according to another embodiment;

FIG. 9 is a schematic flow chart diagram illustrating a partial discharge localization method according to another embodiment;

FIG. 10 is a block diagram of a partial discharge locator device in one embodiment;

FIG. 11 is a block diagram of a partial discharge locator device in one embodiment;

FIG. 12 is a block diagram of a partial discharge locator device in one embodiment;

FIG. 13 is a block diagram of a partial discharge locator device in accordance with one embodiment;

FIG. 14 is a block diagram of a partial discharge locator device in accordance with an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The partial discharge positioning method provided by the application can be applied to positioning equipment shown in fig. 1. Wherein, the internal structure diagram of the positioning device can be as shown in fig. 1. The positioning device comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the positioning device is configured to provide computing and control capabilities. The memory of the positioning device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the positioning device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a partial discharge localization method. The display screen of the positioning device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the positioning device can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the positioning device, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the configuration shown in fig. 1 is a block diagram of only a portion of the configuration relevant to the present teachings and does not constitute a limitation on the positioning apparatus to which the present teachings are applied, and that a particular positioning apparatus may include more or less components than those shown, or combine certain components, or have a different arrangement of components.

In an embodiment of the present application, as shown in fig. 2, a partial discharge positioning method is provided, which is described by taking the method as an example of being applied to the positioning apparatus in fig. 1, and includes the following steps:

step 201, after applying a sinusoidal voltage to a target cable, a positioning device receives a pulse signal emitted by a discharge point in the target cable under the excitation of the sinusoidal voltage.

Specifically, in order to obtain the pulse signals emitted by the discharge points in the target cable more clearly, a sinusoidal voltage may be applied to the target cable, so that the amplitude of the emitted pulse signals is different when the discharge points are excited by the sinusoidal voltage, thereby facilitating the pulse signals to be distinguished and recorded.

Optionally, the positioning device may include a detection impedance, and the detection impedance may perform synchronous coupling acquisition on a pulse signal emitted by the discharge point, so that the positioning device may receive the pulse signal emitted by the discharge point of the target cable under the excitation of the sinusoidal voltage.

In step 202, in the received pulse signals, the positioning device determines the pulse signals with the amplitude larger than a first preset amplitude threshold value as direct pulse signals.

Specifically, the larger the voltage applied to the target cable, the larger the amplitude of the pulse signal emitted from the discharge point in the target cable. Therefore, at the peak time of the sinusoidal voltage, the voltage applied to the target cable is maximum, and the amplitude of the pulse signal emitted from the discharge point is maximum at this time.

For recording and calculation purposes, the positioning device may compare the amplitude of the received pulse signal with a first preset amplitude threshold value, and determine a pulse signal having an amplitude greater than the first preset amplitude threshold value as a direct pulse signal. And the positioning equipment records the receiving moment corresponding to the direct pulse signal.

Step 203, the positioning device determines a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determines the pulse signal with the amplitude larger than a second preset amplitude threshold in the first receiving time window as a secondary reflection pulse signal.

The standard transmission time represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable.

Specifically, one end of the target cable, which is connected to the positioning device, is set as a first end of the target cable, and one end of the target cable, which is far away from the positioning device, is set as a second end of the target cable.

The direct pulse signal is characterized by the pulse signal which is emitted from the discharge point and is directly transmitted to the first end; and the secondary reflection pulse signal represents the pulse signal which is transmitted to the second end through primary reflection after the direct pulse signal reaches the first end, and then is transmitted to the first end again through the primary reflection. From this, the length of the pulse signal transmission on the second day is longer than the length of the direct pulse signal transmission by the distance of two target cable lengths. Since the speed of the pulse signal transmitted in the target cable is unchanged, the standard transmission time length is a fixed value.

Therefore, after determining the receiving time of the direct pulse signal, the positioning device may back-push two standard transmission durations according to the receiving time of the direct pulse signal, and then may determine the first receiving time window. After determining the first reception time window, the positioning device may compare the amplitude of the pulse signal in the first reception time window with a second preset amplitude threshold value, and determine the pulse signal in the first reception time window with an amplitude greater than the second preset amplitude threshold value as a secondary reflected pulse signal.

And 204, the positioning equipment determines a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determines the primary reflected pulse signal in the second receiving time window according to the amplitude.

The direct pulse signal is characterized by the pulse signal which is emitted from the discharge point and is directly transmitted to the first end; the secondary reflection pulse signal represents the pulse signal which is transmitted to the second end through primary reflection after the direct pulse signal reaches the first end, and then is transmitted to the first end again through the primary reflection; the primary reflection pulse signal represents a pulse signal which is emitted from the discharge point, transmitted to the second end firstly, and then transmitted to the first end after primary reflection. It can be seen that the reception timing of the primary reflected pulse signal should be between the reception timing of the direct pulse and the reception timing of the secondary reflected pulse signal. The positioning device can thus determine the second reception time window from the reception instants of the direct pulse signal and the secondary reflected pulse signal.

Alternatively, the positioning apparatus may determine a pulse signal having an amplitude equal to that of the direct pulse signal in the second reception window as the primary reflected pulse signal.

Optionally, the positioning apparatus may further determine a pulse signal having an amplitude equal to the amplitude of the secondary reflected pulse signal in the second reception window as the primary reflected pulse signal.

And step 205, determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

Specifically, after determining the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal, and the receiving time of the secondary reflected pulse signal, the positioning device may calculate the position of the discharge point in the target cable according to a preset algorithm.

Optionally, one end of the target cable, which is connected to the positioning device, is set as a first end of the target cable, and one end of the target cable, which is far away from the positioning device, is set as a second end of the target cable. The positioning device may calculate a first time difference between the instant of reception of the secondary reflected pulse and the instant of reception of the direct pulse and then calculate a second time difference between the instant of reception of the primary reflected pulse and the instant of reception of the direct pulse. The locating device may determine the location of the discharge point in the target cable by multiplying the first time difference by the length of the target cable and then dividing by the second time difference to obtain the length of the discharge point from the second end of the target cable.

In the partial discharge positioning method, after a sinusoidal voltage is applied to a target cable, a pulse signal emitted by a discharge point in the target cable under the excitation of the sinusoidal voltage is received; determining a pulse signal with an amplitude larger than a first preset amplitude threshold value as a direct pulse signal in the received pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; the standard transmission duration represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable; determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal, and determining the primary reflection pulse signal in the second receiving time window according to the amplitude value; and determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal. In the above method, the positioning device determines the direct pulse signal among the received pulse signals according to the principle that the amplitude of the pulse signal emitted when the discharge point is at the peak of the sinusoidal voltage is the largest. The positioning equipment determines first receiving time according to the receiving time of the direct pulse signal and the standard transmission time, and determines a secondary reflection pulse signal from the first receiving time according to the amplitude of the pulse signal. Then, the positioning device determines a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determines the primary reflected pulse signal from the second receiving time according to the amplitude of the pulse signal. Therefore, the accuracy of the receiving time of the determined direct pulse signal, the determined primary reflection pulse signal and the determined secondary reflection pulse signal is ensured. Therefore, the accuracy of the position of the discharge point in the target cable is determined according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

In an embodiment of the present application, as shown in fig. 3, the partial discharge positioning method may further include the following steps:

step 301, the positioning device obtains a synchronous voltage signal corresponding to the sinusoidal voltage, and determines a period of the sinusoidal voltage according to the synchronous voltage signal.

Specifically, a voltage divider may be included in the positioning device, and the positioner may obtain a synchronization voltage signal corresponding to the sinusoidal voltage through the voltage divider. The frequency and the phase of the synchronous voltage signal are the same as those of the sinusoidal voltage, and the amplitude of the synchronous voltage signal is smaller than that of the sinusoidal voltage.

The positioning device may determine the period of the sinusoidal voltage according to the acquired synchronization voltage signal.

In each period of the sinusoidal voltage, the positioning device determines a pulse signal with an amplitude greater than a first preset amplitude threshold as a direct pulse signal, step 302.

Specifically, the larger the voltage applied to the target cable, the larger the amplitude of the pulse signal emitted from the discharge point in the target cable. Therefore, each period of the sinusoidal voltage includes a voltage peak at which the voltage applied to the target cable is maximum, and the amplitude of the pulse signal emitted from the discharge point is maximum.

For ease of recording and calculation, the positioning device may compare the amplitude of the received pulse signal within each sinusoidal voltage cycle to a first preset amplitude threshold and determine a pulse signal having an amplitude greater than the first preset amplitude threshold as the direct pulse signal in each cycle. And the positioning equipment records the receiving time corresponding to the direct pulse signal in each period.

And if the direct pulse signal is not found, jumping to the next period for analysis, and if the direct pulse signal is not found, ending the analysis.

Step 303, the positioning device determines each first receiving time window according to the receiving time of each direct pulse signal and the standard transmission duration, and determines the pulse signal with the amplitude larger than the second preset amplitude threshold value in each first receiving time window as each secondary reflection pulse signal.

Therefore, after determining the receiving time of the direct pulse signal in each period, the positioning apparatus may back-push two standard transmission time lengths according to the receiving time of the direct pulse signal in each period, and may determine the first receiving time window in each period. After determining the first receiving time window in each period, the positioning apparatus may compare the amplitude of the pulse signal in the first receiving time window in each period with a threshold value larger than a second preset amplitude value, and determine the pulse signal in the first receiving time window in each period with the amplitude larger than the second preset amplitude value as a secondary reflected pulse signal in each period.

And if the secondary reflection pulse signal is not found, jumping to the next period for analysis, and if the secondary reflection pulse signal is not found, ending the analysis. And if the secondary reflection pulse signal is found, recording the receiving time corresponding to the secondary reflection pulse signal, and continuously searching in the next period.

And step 304, the positioning equipment determines each second receiving time window according to the receiving time of each direct pulse signal and the receiving time of each secondary reflected pulse signal, and determines each primary reflected pulse signal according to the amplitude of the pulse signal in each second receiving time window.

The direct pulse signal is characterized by the pulse signal which is emitted from the discharge point and is directly transmitted to the first end; the secondary reflection pulse signal represents the pulse signal which is transmitted to the second end through primary reflection after the direct pulse signal reaches the first end, and then is transmitted to the first end again through the primary reflection; the primary reflection pulse signal represents a pulse signal which is emitted from the discharge point, transmitted to the second end firstly, and then transmitted to the first end after primary reflection. It can be seen that, in each cycle, the reception timing of the primary reflected pulse signal should be between the reception timing of the direct pulse and the reception timing of the secondary reflected pulse signal. The positioning device may thus determine the second reception time window in each period from the reception instant of the direct pulse signal in each period and the reception instant of the twice reflected pulse signal in each period.

Alternatively, the positioning apparatus may determine a pulse signal having an amplitude equal to the amplitude of the direct pulse signal in the second reception window in each period as the primary reflected pulse signal in each period.

Optionally, the positioning apparatus may further determine, as the primary reflected pulse signal in each period, a pulse signal having an amplitude equal to the amplitude of the secondary reflected pulse signal in the second receiving window in each period.

And if the primary reflected pulse signal is not found, jumping to the next period for analysis, and if the primary reflected pulse signal is not found, ending the analysis. And if the primary reflection pulse signal is found, recording the receiving time corresponding to the secondary reflection pulse signal, and continuously searching in the next period.

In the embodiment of the application, the positioning device acquires a synchronous voltage signal corresponding to the sinusoidal voltage, and determines the period of the sinusoidal voltage according to the synchronous voltage signal. Therefore, the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period are determined, so that the positioning equipment can determine the position of the discharge point in the target cable calculated by the data corresponding to each period according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period, a foundation is laid for carrying out statistical processing on the position information of a plurality of discharge points in the target cable, and the finally calculated position of the discharge point in the target cable is more accurate.

In an alternative implementation manner of the present application, as shown in fig. 4, the step 205 of determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal, and the receiving time of the secondary reflected pulse signal may include the following steps:

step 401, the positioning device determines position information of a discharge point in the target cable corresponding to each period based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period.

Specifically, after determining the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal, and the receiving time of the secondary reflected pulse signal in each period, the positioning device may calculate, according to a preset algorithm, the position of the discharge point in the target cable calculated by the data corresponding to each period.

Optionally, one end of the target cable, which is connected to the positioning device, is set as a first end of the target cable, and one end of the target cable, which is far away from the positioning device, is set as a second end of the target cable. The positioning apparatus may calculate a first time difference between the reception time of the secondary reflected pulse and the reception time of the direct pulse corresponding to each period, and then calculate a second time difference between the reception time of the primary reflected pulse and the reception time of the direct pulse corresponding to each period. The positioning device can multiply the length of the target cable by the first time difference in each period and then divide the length by the second time difference, and finally calculate the lengths of the plurality of discharge points from the second end of the target cable based on the data corresponding to each period, so as to determine the positions of the plurality of discharge points in the target cable.

For example, assume that there are 100 periods of sinusoidal voltage. The terminal equipment respectively determines the receiving time of a direct pulse signal, the receiving time of a primary reflected pulse signal and the receiving time of a secondary reflected pulse signal in 100 periods, then calculates a first time difference and a second time difference corresponding to each period, and finally obtains the length of a discharging point corresponding to the period from the second end of a target cable by multiplying the first time difference in each period by the length of the target cable and dividing the length by the second time difference corresponding to the period, namely determining the position of the discharging point corresponding to the period in the target cable. And sequentially calculating, and finally calculating the position information of 100 discharge points in the target cable.

And 402, the positioning equipment performs statistical processing on the position information to determine the range of the position of the discharge point in the target cable.

Specifically, after determining the position information corresponding to each period, the positioning device may perform statistical processing on each position information to determine the range of the position of the discharge point in the target cable.

Alternatively, the positioning device may add and then average the respective pieces of location information, and determine a preset range before and after the calculated average as a range of locations of the discharge point in the target cable.

For example, assuming that the calculated average value is 20, the positioning device determines (10, 30) as the range of the position of the discharge point in the target cable according to the preset ranges before and after the average value.

In the embodiment of the application, the positioning device determines the position information of the discharge point corresponding to each period in the target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period. And the positioning equipment carries out statistical processing on the position information and determines the range of the position of the discharge point in the target cable. Therefore, abnormal conditions can be eliminated, and the range of the finally determined discharge point in the target cable is more accurate.

In an alternative implementation manner of the present application, as shown in fig. 5, the "statistically processing each location information to determine the range of the location of the discharge point in the target cable" in step 402 may include the following steps:

step 501, the positioning device obtains a position value corresponding to each piece of position information.

Optionally, the positioning device may determine the calculation result corresponding to each period as a position value, and may further convert each position information into a position value away from one end of the target cable. The embodiment of the present application does not specifically limit the specific manner in which the positioning device obtains the position value corresponding to each position information.

Step 502, the positioning device calculates the frequency of occurrence of each position value.

Alternatively, the positioning device may determine whether the position value is calculated after calculating the position value corresponding to one cycle each time. If the position value calculated this time is the same as the position value calculated last time, the position value does not need to be recorded again, and the number of times corresponding to the position value calculated last time is increased by 1. And analogizing in turn, and finally determining the occurrence frequency of each position numerical value so as to calculate the occurrence frequency of each position numerical value.

For example, assuming that the position value calculated this time is 4, if there is 4 in the calculation results therebetween, it is not necessary to record 4 again, but the number of times of occurrence of the previous calculation result 4 may be increased by 1.

Optionally, the positioning device may need to record the position value after calculating the position value corresponding to one period each time. After calculating the position values corresponding to all periods, counting all the position values, and respectively determining the occurrence times of each position value, thereby calculating the occurrence frequency of each position value.

In step 503, the positioning device retains the position values with the frequency greater than the preset frequency threshold, and determines the range between the maximum value and the minimum value of the retained position values as the range of the position of the discharge point in the target cable.

Specifically, after determining the frequency of occurrence of each position value, the positioning device may compare the frequency corresponding to each position value with a preset frequency threshold, delete the position value having the frequency smaller than the preset frequency threshold, and reserve the position value having the frequency larger than the preset frequency threshold. The locating device determines a maximum value and a minimum value from the retained position values, and determines a range between the maximum value and the minimum value as a range of positions of the discharge point in the target cable.

In the embodiment of the application, the positioning device obtains the position values corresponding to the position information, and calculates the frequency of occurrence of the position values. The positioning device retains position values having a frequency greater than a preset frequency threshold, and determines a range between a maximum value and a minimum value of the retained position values as a range of positions of the discharge point in the target cable. Therefore, the influence of abnormal conditions is eliminated, and the range of the finally determined position of the discharge point in the target cable is more accurate.

In an alternative implementation manner of the present application, as shown in fig. 6, the step 203 of determining the first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length may include the following steps:

step 601, after the positioning device delays the receiving time of the direct pulse signal by two standard transmission time lengths, determining the receiving time as a preset receiving time.

The direct pulse signal is characterized by the pulse signal which is emitted from the discharge point and is directly transmitted to the first end; and the secondary reflection pulse signal represents the pulse signal which is transmitted to the second end through primary reflection after the direct pulse signal reaches the first end, and then is transmitted to the first end again through the primary reflection. From this, the length of the pulse signal transmission on the second day is longer than the length of the direct pulse signal transmission by the distance of two target cable lengths. In addition, the standard transmission time length represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end.

It can be seen that the reception time of the secondary reflected pulse signal is two standard transmission times later than the reception time of the direct pulse.

Therefore, the positioning device determines the reception time of the direct pulse signal as the preset reception time after delaying the reception time by two standard transmission durations.

In step 602, the positioning device determines a duration between preset time margins before and after a preset receiving time as a first receiving time window.

Specifically, the receiving time of the secondary reflected pulse signal received by the positioning device is earlier or later than the preset receiving time due to some abnormal conditions. Therefore, the secondary reflection pulse signal can be accurately searched by the positioning equipment. The positioning device may determine a duration between preset time margins before and after the preset reception time as the first reception time window. The preset time margin may be 0.001s or 0.005s, and the preset time margin is not specifically limited in the present application.

For example, assuming that the preset receiving time is 2.342s, the positioning device may determine (2.340-2.344) as the first receiving time window.

In the embodiment of the present application, the positioning device determines the receiving time of the direct pulse signal as the preset receiving time after delaying the receiving time by two standard transmission time durations, and determines a time duration between preset time margins before and after the preset receiving time as the first receiving time window. Therefore, the positioning equipment can be ensured to accurately search the secondary reflection pulse signal, and the condition that the secondary reflection pulse signal cannot be searched due to the fact that the positioning equipment has errors in receiving the secondary reflection pulse signal because of external factor interference is avoided.

In an alternative implementation manner of the present application, as shown in fig. 7, before the step 601 "determining the direct pulse signal as the preset receiving time after delaying the receiving time by two standard transmission durations", the method may further include the following steps:

step 701, the positioning device obtains the length of a target cable.

Specifically, the positioning device may receive the length of the target cable transmitted by the other device, and may also receive the length of the target cable input by the user. The method for acquiring the length of the target cable by the positioning equipment is not particularly limited.

Step 702, the positioning device receives a standard pulse signal transmitted from one end of the access positioning device and a primary reflected pulse signal corresponding to the standard pulse signal.

Specifically, the user may use another device to transmit a standard pulse signal at one end of the access positioning device, and the positioning device receives the standard pulse signal at an initial time of the transmission of the standard pulse signal, and determines a time of receiving the standard pulse signal. The standard pulse signal is transmitted from one end of the target cable access location device to the other end of the target cable, then reflected from the other end back to the end of the access location device and received again by the location device. The standard pulse signal is transmitted from one end of the target cable connected to the positioning device to the other end of the target cable, and then reflected from the other end back to the end connected to the positioning device, and the primary reflected pulse signal corresponding to the standard pulse signal is called.

In step 703, the positioning device calculates the standard transmission duration based on the length of the target cable divided by the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal.

Specifically, as can be seen from the above, the time difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal is exactly the time when the pulse signal is transmitted from one end of the target cable to the other end and then transmitted back from the other end. Therefore, the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal is divided by 2, and the standard transmission time length can be calculated.

In an embodiment of the present application, a positioning device obtains a length of a target cable. The positioning equipment receives a standard pulse signal transmitted from one end connected with the positioning equipment and a primary reflected pulse signal corresponding to the standard pulse signal. And the positioning equipment calculates and obtains the standard transmission time length based on the length of the target cable divided by the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal. Therefore, the accuracy of the standard transmission time length is ensured, and the positioning equipment can accurately and quickly determine the first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length. Thereby accurately and quickly determining the secondary reflected pulse signal.

In an alternative implementation manner of this application, as shown in fig. 8, the "determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determining the primary reflected pulse signal according to the amplitude of the pulse signal in the second receiving time window" in step 204 may include the following steps:

in step 801, the positioning apparatus determines a time duration between the time of receiving the direct pulse signal and the time of receiving the secondary reflected pulse signal as a second receiving time window.

Specifically, the positioning apparatus determines a time length between the reception timing of the direct pulse signal and the reception timing of the secondary reflected pulse signal as the second reception time window after determining the reception timing of the direct pulse signal and the reception timing of the secondary reflected pulse signal.

Optionally, a time length from a preset time length after the receiving time of the direct pulse signal to a preset time length before the receiving time of the secondary reflected pulse signal may also be determined as the second receiving time window. Wherein the preset time length can be determined according to the duration of the pulse signal.

Illustratively, the time instant of receiving the direct pulse signal is 2.128s, the time instant of receiving the secondary reflected pulse signal is 2.573s, wherein the preset time length is 0.003s, and the positioning apparatus determines the time length between (2.131s-2.570s) as the second receiving time window.

Step 802, the positioning device determines a pulse signal with an amplitude smaller than a first preset amplitude threshold value and larger than a second preset amplitude threshold value in a second receiving time window as a primary reflected pulse signal.

In particular, since the amplitude of the pulse signal within the second reception time window may be compared with the first preset amplitude threshold and the second preset amplitude threshold.

Optionally, in a case that the first preset amplitude threshold is slightly larger than the second preset amplitude threshold, the positioning device may determine, as the primary reflected pulse signal, the pulse signal in the second receiving time window whose amplitude is smaller than the first preset amplitude threshold and larger than the second preset amplitude threshold.

Optionally, in a case that the first preset amplitude threshold is equal to the second preset amplitude threshold, the positioning device may determine, as the primary reflected pulse signal, the pulse signal in the second receiving time window whose amplitude is equal to the first preset amplitude threshold or the second preset amplitude threshold.

In this embodiment, the pulse signal with an amplitude smaller than the first preset amplitude threshold and larger than the second preset amplitude threshold in the second receiving time window may be determined as a primary reflected pulse signal, and the pulse signal with an amplitude smaller than the first preset amplitude threshold and larger than the second preset amplitude threshold in the second receiving time window may be determined as a primary reflected pulse signal. Therefore, the positioning equipment can quickly and accurately determine the primary reflected pulse signal and ensure the accuracy of the determined primary pulse signal. And finally, the accuracy of the calculated position of the partial discharge is improved.

To better explain the partial discharge location method provided in the embodiment of the present application, as shown in fig. 9, it shows a schematic flow chart of a partial discharge location method provided in the embodiment of the present application, where:

step 901, the positioning device obtains the length of the target cable.

Step 902, the positioning device receives a standard pulse signal transmitted from one end of the access positioning device and a primary reflected pulse signal corresponding to the standard pulse signal.

Step 903, the positioning apparatus calculates to obtain a standard transmission time length based on the length of the target cable divided by the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal.

Step 904, the positioning device obtains a synchronous voltage signal corresponding to the sinusoidal voltage, and determines a period of the sinusoidal voltage according to the synchronous voltage signal.

Step 905, the positioning apparatus determines, as a direct pulse signal, a pulse signal having an amplitude greater than a first preset amplitude threshold in each period of the sinusoidal voltage.

Step 906, the positioning device determines the receiving time as a preset receiving time after delaying the receiving time of the direct pulse signal by two standard transmission time lengths.

In step 907, the positioning device determines a duration between preset time margins before and after the preset receiving time as a first receiving time window.

In step 908, the positioning apparatus determines the pulse signal with the amplitude greater than the second preset amplitude threshold in each first receiving time window as each secondary reflected pulse signal.

In step 909, the positioning apparatus determines the time duration between the time of reception of the direct pulse signal and the time of reception of the secondary reflected pulse signal as a second reception time window.

In step 910, the positioning apparatus determines the pulse signal with an amplitude smaller than the first preset amplitude threshold and larger than the second preset amplitude threshold in the second receiving time window as a primary reflected pulse signal.

Step 911, the positioning apparatus determines position information of the discharge point corresponding to each period in the target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal, and the receiving time of the secondary reflected pulse signal in each period.

In step 912, the positioning device obtains a position value corresponding to each position information.

Step 913, the pointing device calculates the frequency of occurrence of each location value.

In step 914, the positioning device retains the position values with the frequency greater than the preset frequency threshold, and determines a range between a maximum value and a minimum value of the retained position values as a range of positions of the discharge point in the target cable.

It should be understood that although the various steps in the flow charts of fig. 2-9 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-9 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.

In one embodiment of the present application, as shown in fig. 10, there is provided a partial discharge positioning apparatus 1000, including: a receiving module 1010, a first determining module 1020, a second determining module 1030, a third determining module 1040, and a fourth determining module 1050, wherein:

the receiving module 1010 is configured to receive a pulse signal emitted by a discharge point in the target cable under excitation of a sinusoidal voltage after the sinusoidal voltage is applied to the target cable.

The first determining module 1020 is configured to determine, as a direct pulse signal, a pulse signal having an amplitude greater than a first preset amplitude threshold from among the received pulse signals.

A second determining module 1030, configured to determine a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determine a pulse signal in the first receiving time window, where the amplitude is greater than a second preset amplitude threshold, as a secondary reflected pulse signal; the standard transmission time represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable.

The third determining module 1040 is configured to determine a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determine the magnitude of the pulse signal in the second receiving time window to determine the primary reflected pulse signal.

A fourth determining module 1050, configured to determine a position of the discharging point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal, and the receiving time of the secondary reflected pulse signal.

In an embodiment of the present application, as shown in fig. 11, the partial discharge positioning apparatus 1000 further includes an obtaining module 1060, where:

the obtaining module 1060 is configured to obtain a synchronous voltage signal corresponding to the sinusoidal voltage, and determine a period of the sinusoidal voltage according to the synchronous voltage signal.

In a corresponding manner, the first and second electrodes are,

a first determining module 1020, configured to determine, as the direct pulse signal, a pulse signal with an amplitude greater than a first preset amplitude threshold in each cycle of the sinusoidal voltage.

The second determining module 1030 is configured to determine each first receiving time window according to the receiving time of each direct pulse signal and the standard transmission duration, and determine a pulse signal with an amplitude greater than a second preset amplitude threshold in each first receiving time window as each secondary reflected pulse signal.

The third determining module 1040 is configured to determine each second receiving time window according to the receiving time of each direct pulse signal and the receiving time of each secondary reflected pulse signal, and determine each primary reflected pulse signal according to the amplitude of the pulse signal in each second receiving time window.

In an embodiment of the present application, as shown in fig. 12, the fourth determining module 1050 includes: a first determining unit 1051 and a second determining unit 1052, wherein:

a first determining unit 1051, configured to determine position information of the discharge point corresponding to each period in the target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal, and the receiving time of the secondary reflected pulse signal in each period.

A second determining unit 1052, configured to perform statistical processing on each position information, and determine a range of positions of the discharge point in the target cable.

In an embodiment of the application, the second determining unit is specifically configured to obtain a location value corresponding to each location information; calculating the occurrence frequency of each position numerical value; and reserving the position values with the frequency larger than the preset frequency threshold value, and determining the range between the maximum value and the minimum value in the reserved position values as the range of the position of the discharge point in the target cable.

In an embodiment of the present application, as shown in fig. 13, the second determining module 1030 includes: a third determination unit 1031 and a fourth determination unit 1032, wherein:

a third determining unit 1031, configured to determine the receiving time of the direct pulse signal as the preset receiving time after delaying the receiving time by two standard transmission time lengths.

A fourth determining unit 1032 is configured to determine a duration between preset time margins before and after the preset receiving time as the first receiving time window.

In an embodiment of the application, as shown in fig. 14, the second determining module 1030 further includes: an acquisition unit 1033, a receiving unit 1034, and a calculation unit 1035, wherein:

an acquisition unit 1033 for acquiring a length of the target cable.

The receiving unit 1034 is configured to receive the standard pulse signal transmitted from one end of the access positioning apparatus and the primary reflected pulse signal corresponding to the standard pulse signal.

And a calculating unit 1035, configured to calculate a standard transmission time length based on the length of the target cable divided by a difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal.

In an embodiment of the application, the third determining unit is specifically configured to determine a duration between a receiving time of the direct pulse signal and a receiving time of the secondary reflected pulse signal as a second receiving time window; and determining the pulse signal with the amplitude smaller than the first preset amplitude threshold value and larger than the second preset amplitude threshold value in the second receiving time window as a primary reflection pulse signal. For the specific definition of the partial discharge positioning device, reference may be made to the above definition of the partial discharge positioning method, which is not described herein again. The modules in the partial discharge positioning device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the positioning device, and can also be stored in a memory in the positioning device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment of the present application, there is provided a positioning apparatus comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the following steps when executing the computer program: after the sinusoidal voltage is applied to the target cable, receiving a pulse signal emitted by a discharge point in the target cable under the excitation of the sinusoidal voltage; determining a pulse signal with an amplitude larger than a first preset amplitude threshold value as a direct pulse signal in the received pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; the standard transmission duration represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable; determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal, and determining the primary reflection pulse signal in the second receiving time window according to the amplitude value; and determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

In one embodiment of the application, the processor when executing the computer program further performs the following steps: acquiring a synchronous voltage signal corresponding to the sinusoidal voltage, and determining the period of the sinusoidal voltage according to the synchronous voltage signal; correspondingly, determining the pulse signal with the amplitude larger than the first preset amplitude threshold value as a direct pulse signal comprises the following steps: determining pulse signals with amplitude values larger than a first preset amplitude threshold value as direct pulse signals in each period of the sine voltage; correspondingly, determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude larger than a second preset amplitude threshold value in the first receiving time window as a secondary reflection pulse signal, including: determining each first receiving time window according to the receiving time and the standard transmission duration of each direct pulse signal, and determining the pulse signals with the amplitude values larger than a second preset amplitude value threshold value in each first receiving time window as each secondary reflection pulse signal; correspondingly, determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determining the primary reflected pulse signal according to the amplitude of the pulse signal in the second receiving time window, including: and determining each second receiving time window according to the receiving time of each direct pulse signal and the receiving time of each secondary reflected pulse signal, and determining each primary reflected pulse signal according to the amplitude of the pulse signal in each second receiving time window.

In one embodiment of the application, the processor when executing the computer program further performs the following steps: determining the position information of the discharge point corresponding to each period in the target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period; and performing statistical processing on the position information to determine the range of the position of the discharge point in the target cable.

In one embodiment of the application, the processor when executing the computer program further performs the following steps: acquiring position values corresponding to the position information; calculating the occurrence frequency of each position numerical value; and reserving the position values with the frequency larger than the preset frequency threshold value, and determining the range between the maximum value and the minimum value in the reserved position values as the range of the position of the discharge point in the target cable.

In one embodiment of the application, the processor when executing the computer program further performs the following steps: after delaying the receiving time of the direct pulse signal by two standard transmission time lengths, determining the receiving time as a preset receiving time; and determining the duration between the preset time margins before and after the preset receiving time as a first receiving time window.

In one embodiment of the application, the processor when executing the computer program further performs the following steps: acquiring the length of a target cable; receiving a standard pulse signal transmitted from one end of an access positioning device and a primary reflected pulse signal corresponding to the standard pulse signal; and calculating to obtain the standard transmission time length based on the length of the target cable divided by the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal.

In one embodiment of the application, the processor when executing the computer program further performs the following steps: determining the time length between the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal as a second receiving time window; and determining the pulse signal with the amplitude smaller than the first preset amplitude threshold value and larger than the second preset amplitude threshold value in the second receiving time window as a primary reflection pulse signal.

In one embodiment of the present application, there is provided a computer readable storage medium having a computer program stored thereon, the computer program when executed by a processor implementing the steps of: after the sinusoidal voltage is applied to the target cable, receiving a pulse signal emitted by a discharge point in the target cable under the excitation of the sinusoidal voltage; determining a pulse signal with an amplitude larger than a first preset amplitude threshold value as a direct pulse signal in the received pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; the standard transmission duration represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable; determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal, and determining the primary reflection pulse signal in the second receiving time window according to the amplitude value; and determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

In one embodiment of the application, the computer program when executed by the processor further performs the steps of: acquiring a synchronous voltage signal corresponding to the sinusoidal voltage, and determining the period of the sinusoidal voltage according to the synchronous voltage signal; correspondingly, determining the pulse signal with the amplitude larger than the first preset amplitude threshold value as a direct pulse signal comprises the following steps: determining pulse signals with amplitude values larger than a first preset amplitude threshold value as direct pulse signals in each period of the sine voltage; correspondingly, determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude larger than a second preset amplitude threshold value in the first receiving time window as a secondary reflection pulse signal, including: determining each first receiving time window according to the receiving time and the standard transmission duration of each direct pulse signal, and determining the pulse signals with the amplitude values larger than a second preset amplitude value threshold value in each first receiving time window as each secondary reflection pulse signal; correspondingly, determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determining the primary reflected pulse signal according to the amplitude of the pulse signal in the second receiving time window, including: and determining each second receiving time window according to the receiving time of each direct pulse signal and the receiving time of each secondary reflected pulse signal, and determining each primary reflected pulse signal according to the amplitude of the pulse signal in each second receiving time window.

In one embodiment of the application, the computer program when executed by the processor further performs the steps of: determining the position information of the discharge point corresponding to each period in the target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period; and performing statistical processing on the position information to determine the range of the position of the discharge point in the target cable.

In one embodiment of the application, the computer program when executed by the processor further performs the steps of: acquiring position values corresponding to the position information; calculating the occurrence frequency of each position numerical value; and reserving the position values with the frequency larger than the preset frequency threshold value, and determining the range between the maximum value and the minimum value in the reserved position values as the range of the position of the discharge point in the target cable.

In one embodiment of the application, the computer program when executed by the processor further performs the steps of: after delaying the receiving time of the direct pulse signal by two standard transmission time lengths, determining the receiving time as a preset receiving time; and determining the duration between the preset time margins before and after the preset receiving time as a first receiving time window.

In one embodiment of the application, the computer program when executed by the processor further performs the steps of: acquiring the length of a target cable; receiving a standard pulse signal transmitted from one end of an access positioning device and a primary reflected pulse signal corresponding to the standard pulse signal; and calculating to obtain the standard transmission time length based on the length of the target cable divided by the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflected pulse signal corresponding to the standard pulse signal.

In one embodiment of the application, the computer program when executed by the processor further performs the steps of: determining the time length between the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal as a second receiving time window; and determining the pulse signal with the amplitude smaller than the first preset amplitude threshold value and larger than the second preset amplitude threshold value in the second receiving time window as a primary reflection pulse signal.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A partial discharge location method for use in a location device connected to a target cable, the method comprising:

after a sinusoidal voltage is applied to the target cable, receiving a pulse signal emitted by a discharge point in the target cable under excitation of the sinusoidal voltage;

determining a pulse signal with an amplitude larger than a first preset amplitude threshold value as a direct pulse signal in the received pulse signals;

determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; the standard transmission time represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable;

determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflection pulse signal, and determining a primary reflection pulse signal in the second receiving time window according to the amplitude;

and determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

2. The method of claim 1, further comprising:

acquiring a synchronous voltage signal corresponding to the sinusoidal voltage, and determining the period of the sinusoidal voltage according to the synchronous voltage signal;

correspondingly, the determining the pulse signal with the amplitude larger than the first preset amplitude threshold value as the direct pulse signal includes:

determining a pulse signal with an amplitude larger than the first preset amplitude threshold value as a direct pulse signal in each period of the sinusoidal voltage;

correspondingly, the determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude larger than a second preset amplitude threshold in the first receiving time window as a secondary reflection pulse signal includes:

determining each first receiving time window according to the receiving time and the standard transmission duration of each direct pulse signal, and determining the pulse signal with the amplitude value larger than the second preset amplitude value threshold value in each first receiving time window as each secondary reflection pulse signal;

correspondingly, the determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determining the primary reflected pulse signal according to the amplitude of the pulse signal in the second receiving time window includes:

and determining each second receiving time window according to the receiving time of each direct pulse signal and the receiving time of each secondary reflected pulse signal, and determining each primary reflected pulse signal according to the amplitude of the pulse signal in each second receiving time window.

3. The method of claim 2, wherein determining the location of the discharge point in the target cable based on the time of receipt of the direct pulse signal, the time of receipt of the primary reflected pulse signal, and the time of receipt of the secondary reflected pulse signal comprises:

determining position information of the discharge point corresponding to each period in the target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal in each period;

and performing statistical processing on each position information to determine the range of the position of the discharge point in the target cable.

4. The method of claim 3, wherein said statistically processing each of said location information to determine a range of locations of said discharge point in said target cable comprises:

acquiring position values corresponding to the position information;

calculating the frequency of occurrence of each of the position values;

reserving the position value of which the frequency is greater than a preset frequency threshold value, and determining a range between the maximum value and the minimum value of the reserved position value as a range of the position of the discharge point in the target cable.

5. The method of claim 1, wherein determining a first receive time window based on the time of receipt of the direct pulse signal and a standard transmission duration comprises:

after delaying the receiving time of the direct pulse signal by two standard transmission time lengths, determining the receiving time as a preset receiving time;

and determining the duration between the preset time margins before and after the preset receiving time as the first receiving time window.

6. The method according to claim 5, wherein said delaying the time of reception of said direct burst signal by two of said standard transmission durations is determined to be before a predetermined reception time, and further comprising:

acquiring the length of the target cable;

receiving a standard pulse signal transmitted from one end accessed to the positioning equipment and a primary reflected pulse signal corresponding to the standard pulse signal;

and calculating the standard transmission time length based on the length of the target cable divided by the difference between the receiving time of the standard pulse signal and the receiving time of the primary reflection pulse signal corresponding to the standard pulse signal.

7. The method of claim 1, wherein determining a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determining the primary reflected pulse signal according to the amplitude of the pulse signal in the second receiving time window comprises:

determining a time duration between the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal as the second receiving time window;

and determining the pulse signal with the amplitude smaller than the first preset amplitude threshold value and larger than the second preset amplitude threshold value in the second receiving time window as the primary reflected pulse signal.

8. A partial discharge localization apparatus, the apparatus comprising:

the receiving module is used for receiving a pulse signal emitted by a discharge point in a target cable under the excitation of a sinusoidal voltage after the sinusoidal voltage is applied to the target cable;

the second determining module is used for determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration, and determining the pulse signal with the amplitude value larger than a second preset amplitude value threshold value in the first receiving time window as a secondary reflection pulse signal; the standard transmission time represents the time required for the pulse signal to be transmitted from one end of the target cable to the other end of the target cable;

a third determining module, configured to determine a second receiving time window according to the receiving time of the direct pulse signal and the receiving time of the secondary reflected pulse signal, and determine a primary reflected pulse signal according to the amplitude of the pulse signal in the second receiving time window;

and the fourth determining module is used for determining the position of the discharge point in the target cable according to the receiving time of the direct pulse signal, the receiving time of the primary reflected pulse signal and the receiving time of the secondary reflected pulse signal.

9. A positioning device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.