CN113219310B

CN113219310B - Partial discharge positioning method, device, positioning equipment and storage medium

Info

Publication number: CN113219310B
Application number: CN202110438958.9A
Authority: CN
Inventors: 卢旭; 王圣; 魏欢; 田杰
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2023-05-02
Anticipated expiration: 2041-04-23
Also published as: CN113219310A

Abstract

The application relates to a partial discharge positioning method, a device, positioning equipment and a storage medium, which are suitable for the technical field of power systems. The method comprises the following steps: in the received pulse signals, determining the pulse signals with the amplitude larger than a first preset amplitude threshold value as direct pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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; 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 according to the amplitude value in the second receiving time window; and determining the position of the discharge point in the target cable according to the direct pulse signal, the primary reflection pulse signal and the receiving time of the secondary reflection pulse signal. By adopting the method, the accuracy of the calculated partial discharge position 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 local discharge positioning method, device, positioning apparatus, and 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 partial discharge positioning is to accurately find out the position of a partial discharge point, thereby being convenient for finding out the reason of partial discharge and taking measures, and finally thoroughly eliminating the partial discharge defect so as to improve the quality and economic benefit of the cable.

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

According to the method, the acquisition time of the pulse signal is determined based on manual operation, and manual operation is needed, so that the position of the partial discharge obtained through final operation is inaccurate.

Disclosure of Invention

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

In a first aspect, there is provided a partial discharge positioning method for use in a positioning apparatus connected to a target cable, the method comprising: after the 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; in the received pulse signals, determining the pulse signals with the amplitude larger than a first preset amplitude threshold value as direct pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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; the standard transmission duration represents the length of time required for transmitting the pulse signal 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 according to the amplitude value in the second receiving time window; 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 reflection pulse signal and the receiving time of the secondary reflection 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 greater than the first preset amplitude threshold value as a direct pulse signal comprises the following steps: in each period of the sinusoidal voltage, determining a pulse signal with an amplitude greater than a first preset amplitude threshold as a direct pulse signal; correspondingly, determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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, wherein the method comprises the following steps: determining each first receiving time window according to the receiving time of each direct pulse signal and the standard transmission time length, and determining the pulse signals with the amplitude larger than a second preset amplitude 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 reflection pulse signal, and determining the primary reflection pulse signal in 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 reflection pulse signal, and determining each primary reflection pulse signal in 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 reception time of the direct pulse signal, the reception time of the primary reflected pulse signal, and the reception time of the secondary reflected pulse signal includes: determining position information of a discharge point corresponding to each period in a target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflection pulse signal and the receiving time of the secondary reflection pulse signal in each period; and carrying out statistical processing on the position information to determine the range of the position of the discharge point in the target cable.

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

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

In one embodiment, after delaying the receiving time of the direct pulse signal by two standard transmission time periods, before determining to be the preset receiving time, the method further includes: acquiring the length of a target cable; receiving a primary reflection pulse signal corresponding to a standard pulse signal transmitted from one end of the access positioning equipment; and calculating to obtain the standard transmission time length based on the difference between the length of the target cable and 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, determining the 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 amplitude of the pulse signal in the second receiving time window includes: determining a time length between the receiving moments of the direct pulse signals and the receiving moments of the secondary reflection pulse signals as a second receiving time window; and determining the pulse signals 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 primary reflection pulse signals.

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

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

the first determining module is used for determining a pulse signal with the amplitude larger than a first preset amplitude threshold value as a direct pulse signal 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 time length, 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; the standard transmission duration represents the length of time required for transmitting the pulse signal 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 in 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 reflection pulse signal and the receiving time of the secondary reflection 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 to the fact that,

the first determining module is used for determining a 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 of each direct pulse signal and the standard transmission time length, and determining the pulse signal with the amplitude larger than a second preset amplitude 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 reflection pulse signal, and determining each primary reflection pulse signal in the amplitude of the pulse signal in each second receiving time window.

In one embodiment, the fourth determining module includes:

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

And the second determining unit is used for carrying out 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 position value corresponding to each position information; calculating the frequency of occurrence of the numerical value of each position; and reserving position values with the frequency larger than a preset frequency threshold value, and determining a range between the maximum value and the minimum value in the reserved position values as a 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 a preset receiving time after deferring the receiving time of the direct pulse signal by two standard transmission time periods;

and a fourth determining unit configured to determine a duration between a preset time margin before and after the preset reception time as the first reception 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 the standard pulse signal transmitted from one end of the access positioning equipment and the primary reflection pulse signal corresponding to the standard pulse signal;

And the calculating unit is used for calculating the standard transmission time length based on the difference between the length of the target cable divided by 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, as the second receiving time window, a duration between a time of receiving the direct pulse signal and a time of receiving the secondarily reflected pulse signal; and determining the pulse signals 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 primary reflection pulse signals.

In a third aspect, there is provided a positioning device comprising a memory storing a computer program and a processor implementing a method as described in any of the first aspects above when the computer program is executed by the processor.

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

The partial discharge positioning method, the partial discharge positioning device, the positioning equipment and the storage medium are used for receiving pulse signals emitted by discharge points in the target cable under the excitation of sinusoidal voltage after the sinusoidal voltage is applied to the target cable; in the received pulse signals, determining the pulse signals with the amplitude larger than a first preset amplitude threshold value as direct pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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; the standard transmission duration represents the length of time required for transmitting the pulse signal 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 according to the amplitude value in the second receiving time window; 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal. In the method, the positioning equipment determines the direct pulse signal in the received pulse signal according to the principle that the amplitude of the pulse signal emitted by the discharge point at the peak value of the sinusoidal voltage is maximum. The positioning device determines a first receiving time according to the receiving time of the direct pulse signal and the standard transmission time length, 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 reflection pulse signal, and determines the primary reflection pulse signal from the second receiving time according to the amplitude of the pulse signal. Thereby ensuring the accuracy of the receiving time of the determined direct pulse signal, the primary reflection pulse signal and the secondary reflection pulse signal. 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal.

Drawings

FIG. 1 is a diagram of an application environment for a partial discharge positioning method in one embodiment;

FIG. 2 is a flow chart of a partial discharge positioning method according to an embodiment;

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

FIG. 4 is a flow chart of a partial discharge positioning method according to another embodiment;

FIG. 5 is a flow chart of a partial discharge positioning method according to another embodiment;

FIG. 6 is a flow chart of a partial discharge positioning method according to another embodiment;

FIG. 7 is a flow chart of a partial discharge positioning method according to another embodiment;

FIG. 8 is a flow chart of a partial discharge positioning method according to another embodiment;

FIG. 9 is a flow chart of a partial discharge positioning method according to another embodiment;

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

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

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

FIG. 13 is a block diagram of a partial discharge positioning device in one embodiment;

fig. 14 is a block diagram of a partial discharge positioning apparatus in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only 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 figure 1. Wherein the internal structure of the positioning device can be 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 adapted to provide computing and control capabilities. The memory of the positioning device comprises a non-volatile 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 the operating system and computer programs in the non-volatile storage media. The communication interface of the positioning device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode 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 positioning 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, can also be keys, a track ball or a touch pad arranged on the shell of the positioning device, and can also be an external keyboard, a touch pad or a mouse and the like.

It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the positioning device to which the present application is applied, and that a particular positioning device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.

In one embodiment of the present application, as shown in fig. 2, a partial discharge positioning method is provided, and the method is applied to the positioning device in fig. 1 for illustration, and includes the following steps:

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

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 discharge points are excited by the sinusoidal voltage, and the amplitudes of the emitted pulse signals are different, so that the pulse signals are conveniently distinguished and recorded.

Optionally, the positioning device may include a detection impedance, where the detection impedance may perform synchronous coupling acquisition on the 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 excitation of the sinusoidal voltage.

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

Specifically, since 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.

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

In 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 time length, and determines the pulse signal with the amplitude greater than the second preset amplitude threshold value in the first receiving time window as the secondary reflection pulse signal.

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

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.

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

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

In step 204, 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 according to the amplitude value in the second receiving time window.

Since the direct pulse signal characterizes the pulse signal emitted from the discharge point to be directly transmitted to the first end; the secondary reflection pulse signal characterizes the pulse signal which is transmitted to the second end after the direct pulse signal reaches the first end through primary reflection, and then is transmitted to the first end again through primary reflection; the primary reflection pulse signal characterizes the pulse signal emitted from the discharge point and transmitted to the second end first and then transmitted to the first end after primary reflection. It is understood that the time of reception of the primary reflected pulse signal should be between the time of reception of the direct pulse and the time of reception of the secondary reflected pulse signal. Thus, the positioning device can determine the second reception time window from the reception time of the direct pulse signal and the reception time of the secondarily reflected pulse signal.

Alternatively, the positioning device may determine the pulse signal having the amplitude equal to the amplitude of the direct pulse signal in the second receiving window as the primary reflection pulse signal.

Alternatively, the positioning device may further determine the pulse signal having the amplitude equal to the amplitude of the secondarily reflected pulse signal in the second receiving window as the primarily reflected pulse signal.

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 reflection pulse signal and the receiving time of the secondary reflection 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 time of receipt of the secondary reflected pulse and the time of receipt of the direct pulse and then calculate a second time difference between the time of receipt of the primary reflected pulse and the time of receipt of the direct pulse. The positioning 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 ultimately obtain the length of the discharge point from the second end of the target cable.

In the partial discharge positioning method, after sinusoidal voltage is applied to the target cable, pulse signals emitted by discharge points in the target cable under excitation of the sinusoidal voltage are received; in the received pulse signals, determining the pulse signals with the amplitude larger than a first preset amplitude threshold value as direct pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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; the standard transmission duration represents the length of time required for transmitting the pulse signal 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 according to the amplitude value in the second receiving time window; 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal. In the method, the positioning equipment determines the direct pulse signal in the received pulse signal according to the principle that the amplitude of the pulse signal emitted by the discharge point at the peak value of the sinusoidal voltage is maximum. The positioning device determines a first receiving time according to the receiving time of the direct pulse signal and the standard transmission time length, 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 reflection pulse signal, and determines the primary reflection pulse signal from the second receiving time according to the amplitude of the pulse signal. Thereby ensuring the accuracy of the receiving time of the determined direct pulse signal, the primary reflection pulse signal and the secondary reflection pulse signal. 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal.

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

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

Specifically, the positioning device may include a voltage divider, and the positioner may acquire the synchronous 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 can determine the period of the sinusoidal voltage according to the acquired synchronous voltage signal.

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

Specifically, since 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. Thus, a voltage peak is included in each period of the sinusoidal voltage, at which time 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 pulse signal received in each sinusoidal voltage period with a first preset amplitude threshold and determine a pulse signal having an amplitude greater than the first preset amplitude threshold as a direct pulse signal in each period. The positioning device records the receiving time corresponding to the direct pulse signal in each period.

If no direct pulse signal is found, jumping to analyze the next period, and if no next period is found, ending.

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 time length, and determines the pulse signal with the amplitude greater 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 device can push back two standard transmission durations according to the receiving time of the direct pulse signal in each period, and then can determine the first receiving time window in each period. After determining the first receive time window in each period, the positioning device may compare the amplitude of the pulse signal in the first receive time window in each period with greater than a second preset amplitude threshold, and determine the pulse signal in the first receive time window in each period having an amplitude greater than the second preset amplitude threshold as a secondary reflected pulse signal in each period.

If the secondary reflection pulse signal is not found, the next period is analyzed, and if the next period is not found, the process is finished. If the secondary reflection pulse signal is found, recording the corresponding receiving time of the secondary reflection pulse signal, and continuing to find in the next period.

Step 304, the positioning device 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 in the amplitude of the pulse signal in each second receiving time window.

Since the direct pulse signal characterizes the pulse signal emitted from the discharge point to be directly transmitted to the first end; the secondary reflection pulse signal characterizes the pulse signal which is transmitted to the second end after the direct pulse signal reaches the first end through primary reflection, and then is transmitted to the first end again through primary reflection; the primary reflection pulse signal characterizes the pulse signal emitted from the discharge point and transmitted to the second end first and then transmitted to the first end after primary reflection. It is clear from this that the reception time of the primary reflected pulse signal should be between the reception time of the direct pulse and the reception time of the secondary reflected pulse signal in each period. Thus, the positioning device can determine the second reception time window in each period from the reception time of the direct pulse signal in each period and the reception time of the secondarily reflected pulse signal in each period.

Alternatively, the positioning device may determine the pulse signal having the amplitude equal to the amplitude of the direct pulse signal in the second receiving window in each period as the primary reflected pulse signal in each period.

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

If the primary reflection pulse signal is not found, the next period is analyzed, and if the next period is not found, the process is finished. If the primary reflection pulse signal is found, recording the corresponding receiving time of the secondary reflection pulse signal, and continuing to find 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal in each period are determined, the positioning equipment can determine the position of the discharge point calculated by data corresponding to each period according to the receiving time of the direct pulse signal, the receiving time of the primary reflection pulse signal and the receiving time of the secondary reflection 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 position of the finally calculated discharge point in the target cable is more accurate.

In an alternative implementation manner of the present application, as shown in fig. 4, the 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 step 205 may include the following:

in step 401, 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.

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 from 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 device 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 may multiply the length of the target cable by the first time difference and then divide the first time difference in each period, and finally calculate lengths of the plurality of discharge points from the second end of the target cable based on data corresponding to each period, so as to determine positions of the plurality of discharge points in the target cable.

For example, assume that there are 100 cycles of sinusoidal voltage. The terminal equipment respectively determines the receiving time of the direct pulse signal, the receiving time of the primary reflection pulse signal and the receiving time of the secondary reflection pulse signal in 100 periods, then calculates a first time difference and a second time difference corresponding to each period, multiplies the length of the target cable by the first time difference in each period and then divides the length by the second time difference corresponding to the period, and finally obtains the length of the discharge point corresponding to the period from the second end of the target cable, namely, determines the position of the discharge 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.

In step 402, the positioning device performs statistical processing on each position information to determine a range of positions 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 position information, and determine a preset range around the calculated average value as a range of the position of the discharge point in the target cable.

For example, assuming that the calculated average value is 20, the positioning apparatus determines (10, 30) as a range of the position of the discharge point in the target cable based on the front and rear preset ranges of 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal in each period. The positioning equipment performs statistics processing on the position information to determine the range of the position of the discharge point in the target cable. Therefore, abnormal conditions can be eliminated, and the finally determined range of the 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. 5, the "performing statistical processing on each position information to determine the range of the position of the discharge point in the target cable" in step 402 may include the following:

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

Alternatively, the positioning device may determine the calculation result corresponding to each period as a position value, and may also convert each position information into a position value distant from one end of the target cable. The specific manner of acquiring the position value corresponding to each position information by the positioning device is not particularly limited.

In 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 period at a time. If the position value calculated at this time is the same as the position value calculated at the last time, the position value does not need to be recorded again, but the number of times corresponding to the position value calculated at the last time is added by 1. And by analogy, finally determining the occurrence times of the numerical values of all the positions, and calculating the occurrence frequency of the numerical values of all the positions.

For example, assuming that the position value calculated at this time is 4, if there is 4 in the calculation results, it is not necessary to record 4 again, but it is sufficient to add 1 to the number of occurrences of the previous calculation result 4.

Alternatively, 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 reserves a position value with a frequency greater than a preset frequency threshold, and determines a range between a maximum value and a minimum value in the reserved position values as a range of positions of the discharge points 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 values with the frequency smaller than the preset frequency threshold, and reserve the position values with the frequency larger than the preset frequency threshold. The positioning device determines a maximum value and a minimum value from the reserved position values, and determines a range between the maximum value and the minimum value as a range of positions of the discharge points in the target cable.

In the embodiment of the application, the positioning device acquires the position values corresponding to the position information, and calculates the occurrence frequency of the position values. The positioning device reserves position values with the frequency larger than a preset frequency threshold value, and determines 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. Therefore, the influence of abnormal conditions is eliminated, and the range of the position 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. 6, the "determining the first receiving time window according to the receiving time of the direct pulse signal and the standard transmission duration" in the above step 203 may include the following steps:

In step 601, the positioning device delays the receiving time of the direct pulse signal by two standard transmission time periods, and then determines the receiving time as a preset receiving time.

Since the direct pulse signal characterizes the pulse signal emitted from the discharge point to be directly transmitted to the first end; the secondary reflection pulse signal represents the pulse signal which is transmitted to the second end after the direct pulse signal reaches the first end through primary reflection and then is transmitted to the first end again through primary reflection. It is known that the length of the pulse signal transmission on the next day is longer than that of the direct pulse signal transmission by the distance of two target cable lengths. In addition, since the standard transmission duration characterizes the length of time required for a pulse signal to be transmitted from one end of the target cable to the other.

It follows that the time of receipt of the secondary reflected pulse signal is two standard transmission durations later than the time of receipt of the direct pulse.

Therefore, the positioning device delays the receiving time of the direct pulse signal by two standard transmission time periods and then determines the receiving time as the preset receiving time.

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

Specifically, the positioning device receives the secondarily reflected pulse signal at a receiving time earlier or later than the preset receiving time due to the possibility of some abnormal conditions. Therefore, in order to ensure that the positioning device can accurately find the secondary reflected pulse signal. The positioning device may determine a duration between a preset time margin before and after the preset reception time as the first reception time window. The preset time margin may be 0.001s or 0.005s, which is not specifically limited in this application.

Illustratively, assuming a preset receive time of 2.342s, the positioning device may determine (2.340-2.344) as the first receive time window.

In the embodiment of the present application, after deferring the receiving time of the direct pulse signal by two standard transmission time periods, the positioning device determines the receiving time as a preset receiving time period, and determines a time period between preset time margins before and after the preset receiving time period as a first receiving time window. Therefore, the positioning equipment can be ensured to accurately find the secondary reflection pulse signal, and the situation that the secondary reflection pulse signal cannot be found due to the fact that the receiving time of the secondary reflection pulse signal is error due to the interference of external factors is avoided.

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

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

Specifically, the positioning device may receive the length of the target cable sent by the other device, and may also receive the length of the target cable input by the user. The manner in which the positioning device obtains the length of the target cable is not particularly limited.

In step 702, the positioning device receives a standard pulse signal transmitted from an end of the access positioning device and a primary reflection pulse signal corresponding to the standard pulse signal.

Specifically, the user may transmit a standard pulse signal at one end of the access positioning device by using other devices, 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 when the standard pulse signal is received. The standard pulse signal is transmitted from one end of the target cable to the other end of the target cable, and 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 to the other end of the target cable, and then reflected from the other end back to the end of the access positioning device is called a primary reflection pulse signal corresponding to the standard pulse signal.

In step 703, the positioning device calculates the standard transmission duration based on the difference between the length of the target cable divided by the receiving time of the standard pulse signal and the receiving time of the primary reflection 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 reflection pulse signal corresponding to the standard pulse signal is exactly the time when the pulse signal is transmitted from one end to the other end of the target cable 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 reflection pulse signal corresponding to the standard pulse signal is divided by 2, so that the standard transmission time length can be calculated.

In the embodiment of the application, the positioning device obtains the length of the target cable. The positioning device receives a standard pulse signal transmitted from one end of the access positioning device and a primary reflection pulse signal corresponding to the standard pulse signal. The positioning device calculates and obtains the standard transmission time 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. 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 rapidly determining the secondary reflection pulse signal.

In an alternative implementation manner of the present application, as shown in fig. 8, the "determining the 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" in the step 204 may include the following:

in step 801, the positioning device determines a duration between the time of reception of the direct pulse signal and the time of reception of the secondarily reflected pulse signal as a second reception time window.

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

Alternatively, the time length between the preset time length after the receiving time of the direct pulse signal and the preset time length before the receiving time of the secondary reflection pulse signal may be determined as the second receiving time window. The preset time length can be determined according to the duration of the pulse signal.

For example, the receiving time of the direct pulse signal is 2.128s, and the receiving time of the secondary reflected pulse signal is 2.573s, where the preset time length is 0.003s, and the positioning device determines the time length between (2.131 s-2.570 s) as the second receiving time window.

In step 802, the positioning device determines a pulse signal in the second receiving time window having an amplitude smaller than the first preset amplitude threshold and larger than the second preset amplitude threshold as a primary reflection pulse signal.

Specifically, since the amplitude of the pulse signal in the second reception time window can be compared with the first preset amplitude threshold value and the second preset amplitude threshold value.

Optionally, in the 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, a pulse signal in the second receiving time window having an amplitude smaller than the first preset amplitude threshold and larger than the second preset amplitude threshold.

Optionally, in the case that the first preset amplitude threshold is equal to the second preset amplitude threshold, the positioning device may determine, as the primary reflection pulse signal, a pulse signal in the second reception time window having an amplitude equal to the first preset amplitude threshold or the second preset amplitude threshold.

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

In order to better explain the partial discharge positioning method provided in the embodiments of the present application, as shown in fig. 9, a flow diagram of the partial discharge positioning method provided in the embodiments of the present application is shown, where:

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

In step 902, the positioning device receives a standard pulse signal transmitted from an end of the access positioning device and a primary reflection pulse signal corresponding to the standard pulse signal.

In step 903, the positioning device calculates a standard transmission duration based on the difference between the length of the target cable divided by 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 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.

In step 905, the positioning device 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 delays the receiving time of the direct pulse signal by two standard transmission time periods, and then determines the receiving time as a preset receiving time.

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

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

In step 909, the positioning device determines the duration between the time of receipt of the direct pulse signal and the time of receipt of the secondarily reflected pulse signal as the second receive time window.

In step 910, the positioning device determines the pulse signal in the second receiving time window having the amplitude smaller than the first preset amplitude threshold and larger than the second preset amplitude threshold as the primary reflection pulse signal.

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

In step 912, the positioning device obtains the position values corresponding to the position information.

In step 913, the locating device calculates the frequency of occurrence of the values of each location.

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

It should be understood that, although the steps in the flowcharts of fig. 2-9 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 2-9 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the steps or stages in other steps or other steps.

In one embodiment of the present application, as shown in fig. 10, there is provided a partial discharge positioning apparatus 1000, comprising: 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:

a receiving module 1010, configured to receive a pulse signal emitted by a discharge point in a 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 the direct pulse signal, a pulse signal having an amplitude greater than a first preset amplitude threshold value among the received pulse signals.

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

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 reflection pulse signal, and determine the primary reflection pulse signal in the amplitude of the pulse signal in the second receiving time window.

The fourth determining module 1050 is configured to determine a 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 present application, as shown in fig. 11, the above-mentioned 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 to the fact that,

the first determining module 1020 is configured to determine, as the direct pulse signal, a pulse signal having an amplitude greater than a first preset amplitude threshold value in each period 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, as each secondary reflection pulse signal, a pulse signal in each first receiving time window with an amplitude greater than a second preset amplitude threshold.

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

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

A second determining unit 1052 for performing statistical processing on each position information to determine the range of the position of the discharge point in the target cable.

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

In one 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:

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

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

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

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

And a receiving unit 1034, configured to receive the standard pulse signal transmitted from one end of the access positioning device and a primary reflection pulse signal corresponding to the standard pulse signal.

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

In an embodiment of the present application, the third determining unit is specifically configured to determine a duration between a time of receiving the direct pulse signal and a time of receiving the secondary reflected pulse signal as the second receiving time window; and determining the pulse signals 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 primary reflection pulse signals. For specific limitations of the partial discharge positioning device, reference may be made to the above limitations of the partial discharge positioning method, and no further description is given here. The modules in the partial discharge positioning device described above may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in hardware or independent from a processor in the positioning device, or can be stored in a memory in the positioning device in a software form, so that the processor can call and execute the operations corresponding to the above modules.

In one embodiment of the present application, there is provided a positioning device comprising a memory and a processor, the memory storing 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 excitation of the sinusoidal voltage; in the received pulse signals, determining the pulse signals with the amplitude larger than a first preset amplitude threshold value as direct pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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; the standard transmission duration represents the length of time required for transmitting the pulse signal 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 according to the amplitude value in the second receiving time window; 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal.

In one embodiment of the present application, the processor when executing the computer program 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 greater than the first preset amplitude threshold value as a direct pulse signal comprises the following steps: in each period of the sinusoidal voltage, determining a pulse signal with an amplitude greater than a first preset amplitude threshold as a direct pulse signal; correspondingly, determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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, wherein the method comprises the following steps: determining each first receiving time window according to the receiving time of each direct pulse signal and the standard transmission time length, and determining the pulse signals with the amplitude larger than a second preset amplitude 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 reflection pulse signal, and determining the primary reflection pulse signal in 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 reflection pulse signal, and determining each primary reflection pulse signal in the amplitude of the pulse signal in each second receiving time window.

In one embodiment of the present application, the processor when executing the computer program further performs the steps of: determining position information of a discharge point corresponding to each period in a target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflection pulse signal and the receiving time of the secondary reflection pulse signal in each period; and carrying out 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 present application, the processor when executing the computer program further performs the steps of: acquiring position values corresponding to the position information; calculating the frequency of occurrence of the numerical value of each position; and reserving position values with the frequency larger than a preset frequency threshold value, and determining a range between the maximum value and the minimum value in the reserved position values as a range of the position of the discharge point in the target cable.

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

In one embodiment of the present application, the processor when executing the computer program further performs the steps of: acquiring the length of a target cable; receiving a primary reflection pulse signal corresponding to a standard pulse signal transmitted from one end of the access positioning equipment; and calculating to obtain the standard transmission time length based on the difference between the length of the target cable and 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 of the present application, the processor when executing the computer program further performs the steps of: determining a time length between the receiving moments of the direct pulse signals and the receiving moments of the secondary reflection pulse signals as a second receiving time window; and determining the pulse signals 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 primary reflection pulse signals.

In one embodiment of the present application, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs 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 excitation of the sinusoidal voltage; in the received pulse signals, determining the pulse signals with the amplitude larger than a first preset amplitude threshold value as direct pulse signals; determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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; the standard transmission duration represents the length of time required for transmitting the pulse signal 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 according to the amplitude value in the second receiving time window; 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal.

In one embodiment of the present 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 greater than the first preset amplitude threshold value as a direct pulse signal comprises the following steps: in each period of the sinusoidal voltage, determining a pulse signal with an amplitude greater than a first preset amplitude threshold as a direct pulse signal; correspondingly, determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, 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, wherein the method comprises the following steps: determining each first receiving time window according to the receiving time of each direct pulse signal and the standard transmission time length, and determining the pulse signals with the amplitude larger than a second preset amplitude 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 reflection pulse signal, and determining the primary reflection pulse signal in 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 reflection pulse signal, and determining each primary reflection pulse signal in the amplitude of the pulse signal in each second receiving time window.

In one embodiment of the present application, the computer program when executed by the processor further performs the steps of: determining position information of a discharge point corresponding to each period in a target cable based on the receiving time of the direct pulse signal, the receiving time of the primary reflection pulse signal and the receiving time of the secondary reflection pulse signal in each period; and carrying out 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 present application, the computer program when executed by the processor further performs the steps of: acquiring position values corresponding to the position information; calculating the frequency of occurrence of the numerical value of each position; and reserving position values with the frequency larger than a preset frequency threshold value, and determining a range between the maximum value and the minimum value in the reserved position values as a range of the position of the discharge point in the target cable.

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

In one embodiment of the present application, the computer program when executed by the processor further performs the steps of: acquiring the length of a target cable; receiving a primary reflection pulse signal corresponding to a standard pulse signal transmitted from one end of the access positioning equipment; and calculating to obtain the standard transmission time length based on the difference between the length of the target cable and 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 of the present application, the computer program when executed by the processor further performs the steps of: determining a time length between the receiving moments of the direct pulse signals and the receiving moments of the secondary reflection pulse signals as a second receiving time window; and determining the pulse signals 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 primary reflection pulse signals.

Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A partial discharge positioning method for use in a positioning apparatus 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;

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

Determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length, and determining a 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; the standard transmission duration represents the length of 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 according to the amplitude value in the second receiving time window;

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 reflection pulse signal and the receiving time of the secondary reflection pulse signal;

the determining a first receiving time window according to the receiving time of the direct pulse signal and the standard transmission time length includes:

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

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

2. The method according to claim 1, wherein 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, the determining the pulse signal with the amplitude greater than the first preset amplitude threshold as the direct pulse signal comprises the following steps:

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

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

determining each first receiving time window according to the receiving time of each direct pulse signal and the standard transmission time length, and determining 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;

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

3. The method of claim 2, wherein said 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 reflection pulse signal and the receiving time of the secondary reflection pulse signal in each period;

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

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

Acquiring a position value corresponding to each piece of position information;

calculating the frequency of occurrence of each position value;

and reserving the position values with the frequencies larger than a 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.

5. The method according to claim 1, wherein the step of delaying the reception time of the direct pulse signal by two of the standard transmission time periods is performed before the predetermined reception time period is determined, the method further comprising:

receiving a standard pulse signal transmitted from one end connected with the positioning equipment and a primary reflection pulse signal corresponding to the standard pulse signal;

and dividing 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 by 2, and calculating to obtain the standard transmission time length.

6. The method of claim 1, wherein the determining a second receive time window from the receive time of the direct pulse signal and the receive time of the secondary reflected pulse signal, and determining a primary reflected pulse signal in the second receive time window from the magnitude of the pulse signal, comprises:

Determining a duration between the receiving moments of the direct pulse signals and the receiving moments of the secondary reflected pulse signals as the second receiving time window;

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

7. A partial discharge positioning device, the device comprising:

a receiving module for receiving a pulse signal emitted by a discharge point in a target cable under 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 time length, 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; the standard transmission duration represents the length of 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 a primary reflection pulse signal in the second receiving time window according to the amplitude of the pulse signal;

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

the second determining module is further configured to delay the receiving time of the direct pulse signal by two standard transmission durations, and determine the receiving time as a preset receiving time; and determining the duration between the preset time allowance before and after the preset receiving time as the first receiving time window.

8. A positioning device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 6 when the computer program is executed.

9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.