CN215728545U - Traveling wave signal processing unit and traveling wave detection module - Google Patents
Traveling wave signal processing unit and traveling wave detection module Download PDFInfo
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Abstract
The utility model provides a traveling wave signal processing unit and a traveling wave detection module, wherein the traveling wave signal processing unit comprises a positive polarity wave head detection module, a negative polarity wave head detection module and an OR gate operation module, and the positive polarity wave head detection module and the negative polarity wave head detection module are connected in parallel; the traveling wave head detection device comprises a positive polarity wave head detection module, a negative polarity wave head detection module and an OR gate operation module, wherein the positive polarity wave head detection module is used for detecting a signal generated by a positive polarity wave head, the negative polarity wave head detection module is used for detecting a signal generated by a negative polarity wave head, an output signal of the positive polarity wave head detection module and an output signal of the negative polarity wave head detection module are used as input signals of the OR gate operation module to carry out OR operation to obtain a traveling wave head mutation signal.
Description
Technical Field
The utility model belongs to the technical field of power grid testing of power systems, and particularly relates to a traveling wave signal processing unit and a traveling wave detection module.
Background
At present, fault location of a power distribution network is difficult to realize due to factors such as short lines, multiple branches, mixed laying of overhead lines and cable lines, various loads distributed along the lines and the like. Particularly, a small current grounding system has weak fault current, the influence of transition resistance and measurement error of a fault point is particularly large, and accurate measurement is difficult by using the traditional impedance distance measurement principle. Therefore, the distance of the small-current ground fault is measured by adopting the traveling wave for the 35kV distribution network line with longer line and less branches.
A traveling wave ("TW") is a surge of electricity caused by a sudden change in voltage (e.g., a short circuit) that propagates along an electric power line at a very high speed. The propagation speed is close to the speed of light in free space for overhead lines and half the speed of light in free space for underground cable lines. Depending on the location of the fault and the type of line, the travelling wave originating at the location of the short circuit on the transmission line reaches the line termination within as little as 1-2 milliseconds after the fault. The relative timing, polarity and amplitude of the traveling waves allows for accurate fault localization and enables several line protection techniques. Because the travelling wave is transmitted to the line termination after the line is short-circuited.
The traveling wave has current and voltage components. As the traveling wave propagates, a sudden change in voltage ("voltage traveling wave") and a sudden change in current ("current traveling wave") can be observed at any point along the line. The voltage travelling wave and the current travelling wave on the line far from the end of the line are correlated by the line characteristic impedance.
In recent years, traveling wave fault location and ranging technology is rapidly developed, effective extraction of traveling wave signals is a premise of traveling wave protection and traveling wave fault location of a high-voltage power grid, and whether the traveling wave signals can be effectively extracted depends on whether a transformer can correctly transmit and convert high-frequency transient quantity.
Therefore, a traveling wave detection module is needed to effectively transmit high-frequency transient amount and quickly capture transient sudden change signals of a traveling wave head, so as to accurately and quickly locate a fault point.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a traveling wave signal processing unit and a traveling wave detection module, which can effectively transmit high-frequency transient amount and quickly capture a transient abrupt change signal of a traveling wave head, so as to accurately and quickly locate a fault point.
In order to achieve the above object, the present invention provides a traveling wave signal processing unit, which comprises a positive polarity wave head detection module, a negative polarity wave head detection module, and an or gate operation module, wherein the positive polarity wave head detection module and the negative polarity wave head detection module are connected in parallel; the positive polarity wave head detection module is used for detecting a positive polarity wave head generated signal, the negative polarity wave head detection module is used for detecting a negative polarity wave head generated signal, and an output signal of the positive polarity wave head detection module and an output signal of the negative polarity wave head detection module are used as input signals of the OR gate operation module to carry out OR operation to obtain a traveling wave head mutation signal.
As a further improvement of the above scheme, the positive polarity wave head detection module includes a positive change rate level setting module, a positive peak level setting module, and a first and gate operation module, the positive change rate level setting module and the positive peak level setting module are connected in parallel, and signal output ends of the positive change rate level setting module and the positive peak level setting module are connected with a signal input end of the first and gate operation module and are operated by the first and gate operation module to obtain the positive polarity traveling wave head detection signal.
As a further improvement of the above scheme, the positive change rate level setting module includes a first differential module, a first level comparison module and a first high level holding module which are sequentially connected in series; the positive peak level setting module comprises a second level comparison module.
As a further improvement of the above scheme, the positive polarity wave head detection module further includes a third high level holding module, and a signal input end of the third high level holding module is electrically connected to an output end of the first and gate operation module.
As a further improvement of the above scheme, the negative polarity wave head detection module includes a negative change rate level setting module, a negative peak level setting module, and a second and gate operation module, the negative change rate level setting module and the negative peak level setting module are connected in parallel, and signal output ends of the negative change rate level setting module and the negative peak level setting module are connected with a signal input end of the second and gate operation module and are operated by the second and gate operation module to obtain a negative polarity traveling wave head detection signal.
As a further improvement of the above scheme, the negative change rate level setting module includes a second differential module, a third level comparison module and a second high level holding module which are sequentially connected in series; the negative peak value level setting module comprises a fourth level comparison module.
As a further improvement of the above scheme, the negative polarity wave head detection module further includes a fourth high level holding module, and a signal input end of the fourth high level holding module is electrically connected to an output end of the second and gate operation module.
As a further improvement of the above scheme, a second not gate operation module is further arranged between the or gate operation module and the first and gate operation module, and the negative traveling wave head detection signal is an input signal of the second not gate operation module; and a first NOT gate operation module is also arranged between the OR gate operation module and the second AND gate operation module, and the positive polarity traveling wave head detection signal is an input signal of the first NOT gate operation module.
The utility model also provides a traveling wave head detection method, which comprises the following steps:
the signal input of the double-shielded coaxial cable is respectively input into the positive wave head detection module and the negative wave head detection module;
if the positive polarity wave head detection module detects that the positive change rate level is higher than the first voltage set value, judging that a traveling wave head mutation signal is generated, keeping the positive change rate level within a certain time, and judging that a fault traveling wave is generated and generating a positive polarity traveling wave head detection signal if the positive peak level is higher than the second voltage set value during the period;
if the negative polarity wave head detection module detects that the negative change rate level is higher than the first voltage set value, judging to generate a traveling wave head mutation signal, keeping the negative change rate level within a certain time, and judging to be a fault traveling wave and generating a negative polarity traveling wave head detection signal if the negative peak value level is higher than the second voltage set value during the certain time;
and taking the positive polarity traveling wave head detection signal and the negative polarity traveling wave head detection signal as input signals of the OR gate operation module to carry out OR operation so as to obtain a traveling wave head mutation signal.
As a further improvement of the above, the first voltage setting value is 0.3V, the second voltage setting value is 1V, and the certain time is at least 10 μ s.
As a further improvement of the scheme, when the positive polarity traveling wave head detection signal or the negative polarity traveling wave head detection signal is generated, the traveling wave head sudden change signal is kept for 1ms, and simultaneously, the positive polarity traveling wave head detection signal or the negative polarity traveling wave head detection signal is kept for 1ms, so that the multiple triggering of the reflection and refraction traveling waves is prevented.
The utility model also provides a traveling wave detection module, which comprises a capacitive voltage sensor, an overvoltage protection module, a voltage division module, a signal transmission cable and the traveling wave signal processing unit which are electrically connected in sequence, wherein the capacitive voltage sensor is used for transmitting and transforming high-frequency transient signals and inhibiting low-frequency signals, the overvoltage protection module is used for preventing overvoltage signals from entering the traveling wave signal processing unit, the voltage division module is used for reducing the voltage signals to the level required by the traveling wave head, and the traveling wave signal processing unit is used for detecting and identifying the traveling wave head so as to accurately detect the initial moment of the traveling wave head.
As a further improvement of the above scheme, the overvoltage protection module includes a resistor R1, a diode D1, and a varistor RV1, the diode D1 and the resistor R1 are respectively connected in parallel with the varistor RV1, and the resistor R1 is grounded.
As a further improvement of the above solution, the transient voltage control circuit comprises a first transient diode TVS1, a second transient diode TVS2, a resistor R2 and a resistor R3, wherein the resistor R2 and the resistor R3 are connected in parallel, and the first transient diode TVS1 and the second transient diode TVS2 are connected in series in reverse in sequence for controlling the voltage across the resistor R2 and the resistor R3.
As a further improvement of the above scheme, the overvoltage protection module and the voltage division module are electrically connected through a coaxial cable.
As a further improvement of the above scheme, the voltage division module and the traveling wave signal processing unit are electrically connected through a coaxial cable.
As a further improvement of the above scheme, the traveling wave signal processing unit includes a clock for accurately recording the arrival time of the traveling wave pulse signal, thereby accurately positioning the fault.
As a further improvement of the scheme, the clock comprises but is not limited to a GPS1PPS (second pulse synchronous clock) or a Beidou synchronous clock.
Due to the adoption of the technical scheme, the utility model has the beneficial effects that:
1. the utility model provides a traveling wave signal processing unit, which comprises a positive polarity wave head detection module, a negative polarity wave head detection module and an OR gate operation module, wherein the positive polarity wave head detection module and the negative polarity wave head detection module are connected in parallel; the positive polarity wave head detection module is used for detecting a positive polarity wave head generated signal, the negative polarity wave head detection module is used for detecting a negative polarity wave head generated signal, and an output signal of the positive polarity wave head detection module and an output signal of the negative polarity wave head detection module are used as input signals of the OR gate operation module to carry out OR operation to obtain a traveling wave head mutation signal; the utility model carries out the detection of the positive polarity traveling wave head and the detection of the negative polarity traveling wave head in parallel, can quickly capture the transient sudden change signal of the traveling wave head, then carries out OR operation on the two, and any one wave head detection module judges that the sudden change signal of the traveling wave head is generated when detecting the wave head, and accordingly obtains the time of generating the fault traveling wave, thereby being capable of accurately and quickly positioning the fault point.
2. The utility model provides a traveling wave head detection method.A double-shielded coaxial cable signal input is respectively input into a positive wave head detection module and a negative wave head detection module;
if the positive polarity wave head detection module detects that the positive change rate level is higher than the first voltage set value, judging that a traveling wave head mutation signal is generated, keeping the positive change rate level within a certain time, and judging that a fault traveling wave is generated and generating a positive polarity traveling wave head detection signal if the positive peak level is higher than the second voltage set value during the period; if the negative polarity wave head detection module detects that the negative change rate level is higher than the first voltage set value, judging to generate a traveling wave head mutation signal, keeping the negative change rate level within a certain time, and judging to be a fault traveling wave and generating a negative polarity traveling wave head detection signal if the negative peak value level is higher than the second voltage set value during the certain time; taking the positive polarity traveling wave head detection signal and the negative polarity traveling wave head detection signal as input signals of an OR gate operation module to carry out OR operation so as to obtain a traveling wave head mutation signal; the positive and negative polarity traveling wave heads are simultaneously detected in parallel, and two parameters of the change rate level and the peak level are respectively used as the basis for judging the generated traveling wave heads so as to ensure the accuracy of judging sudden change signals of the traveling wave heads.
3. The utility model provides a traveling wave detection module, which comprises a capacitive voltage sensor, an overvoltage protection module, a voltage division module, a signal transmission cable and a traveling wave signal processing unit, wherein the capacitive voltage sensor, the overvoltage protection module, the voltage division module, the signal transmission cable and the traveling wave signal processing unit are sequentially and electrically connected, the capacitive voltage sensor is used for transmitting and converting a high-frequency transient signal and inhibiting a low-frequency signal, the overvoltage protection module is used for preventing the overvoltage signal from jumping into the traveling wave signal processing unit, the voltage division module is used for reducing the voltage signal to a level required by a traveling wave head, the traveling wave signal processing unit is used for detecting and identifying the traveling wave head so as to accurately detect the initial moment of the traveling wave head, the capacitive voltage sensor is used for transmitting and converting the high-frequency transient signal and inhibiting the low-frequency signal, and an accurate signal is provided for the traveling wave head detection module; the overvoltage protection module is used for protecting overvoltage under the condition of lightning and other extreme conditions, because overvoltage is usually generated when a power system breaks down, in order to protect the traveling wave signal processing unit and avoid the damage to the traveling wave signal processing unit caused by the entering of overvoltage signals; the amplitude of the input signal is reduced to the voltage required by the traveling wave head detection module through the voltage division module, and due to the characteristics of high-frequency signal transmission, the impedance matching problem of the resistance of the voltage division module and a signal cable needs to be considered, so that the high-frequency signal is prevented from being reflected at the junction of the cable and the sensor, and the purpose of reducing the signal-to-noise ratio is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
FIG. 1 is a schematic diagram of a traveling wave signal processing unit according to the present invention;
fig. 2 is a block diagram of a novel traveling wave detection module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators such as the first, second, upper, lower, left, right, front and rear … … in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model will be further described with reference to the following figures:
example 1:
referring to fig. 1, the present invention provides a traveling wave signal processing unit, which includes a positive polarity wave head detection module, a negative polarity wave head detection module, and an or gate operation module, wherein the positive polarity wave head detection module and the negative polarity wave head detection module are connected in parallel; the positive polarity wave head detection module is used for detecting a positive polarity wave head generated signal, the negative polarity wave head detection module is used for detecting a negative polarity wave head generated signal, and an output signal of the positive polarity wave head detection module and an output signal of the negative polarity wave head detection module are used as input signals of the OR gate operation module to carry out OR operation to obtain a traveling wave head mutation signal; the wave signal processing unit carries out detection of the positive polarity traveling wave head and detection of the negative polarity traveling wave head in parallel, can quickly capture transient mutation signals of the traveling wave head, then carries out OR operation on the signals and the signals, and any one wave head detection module detects that the wave head judges that the traveling wave head mutation signals are generated, so that the time for generating the fault traveling wave is obtained, and therefore, the fault point can be accurately and quickly positioned.
As a preferred embodiment, the positive polarity wave head detection module includes a positive change rate level setting module, a positive peak level setting module, and a first and gate operation module, the positive change rate level setting module and the positive peak level setting module are connected in parallel, and signal output ends of the positive change rate level setting module and the positive peak level setting module are connected with a signal input end of the first and gate operation module and perform and operation at the first and gate operation module to obtain the positive polarity traveling wave head detection signal.
In the embodiment, an analog signal S0 is input through a cable, a signal S0 outputs a level signal S1 through the first differential module, a level signal S1 passes through the first level comparison module and is compared with a first voltage set value, and a signal S3 is output, wherein the signal S3 is subjected to pressure maintaining by the first high level holding module within a certain time and outputs a signal S6, so that the voltage fluctuation is prevented from influencing the subsequent result judgment; the positive peak value level setting module comprises a second level comparison module, the analog signal S0 passes through the second level comparison module and is compared with a second voltage set value to output a signal S7, and the signal S6 and the signal S7 are input signals of the first AND gate operation module.
As a preferred embodiment, the positive polarity wave head detection module further includes a third high level holding module, a signal input end of the third high level holding module is electrically connected to an output end of the first and gate operation module, and is configured to hold an output signal of the first and gate operation module, in this embodiment, the output signal S9 of the first and gate operation module is held for 1ms, so as to prevent multiple triggers of reflecting and refracting a traveling wave from affecting the accuracy of detecting the traveling wave head.
As a preferred embodiment, the negative polarity wave head detection module includes a negative change rate level setting module, a negative peak value level setting module and a second and gate operation module, the negative change rate level setting module and the negative peak value level setting module are connected in parallel, and signal output ends of the negative change rate level setting module and the negative peak value level setting module are connected with a signal input end of the second and gate operation module and are subjected to and operation at the second and gate operation module to obtain a negative polarity traveling wave head detection signal.
As a preferred embodiment, the negative change rate level setting module includes a second differential module, a third level comparison module, and a second high level holding module, which are sequentially connected in series; in the embodiment, an analog signal S0 is input through a cable, a signal S0 outputs a level signal S2 through a first differential module, a level signal S2 passes through a third level comparison module and is compared with a first voltage set value, a signal S4 is output, a signal S4 is subjected to pressure maintaining by a second high level maintaining module within a certain time, and a signal S5 is output, so that voltage fluctuation is prevented from occurring, and subsequent result judgment is influenced; the negative peak value level setting module comprises a fourth level comparison module, the analog signal S0 passes through the fourth level comparison module and is compared with a second voltage set value to output a signal S8, and the signal S5 and the signal S8 are input signals of the second AND gate operation module.
As a preferred embodiment, the negative polarity wave head detection module further includes a fourth high level holding module, a signal input end of the fourth high level holding module is electrically connected to an output end of the second and gate operation module, and is configured to hold an output signal of the second and gate operation module, in this embodiment, the output signal S10 of the second and gate operation module is held for 1ms, so as to prevent multiple triggers of reflecting and refracting a traveling wave from affecting accuracy of detecting the traveling wave head.
As a preferred embodiment, a second not gate operation module is further disposed between the or gate operation module and the first and gate operation module, the negative polarity traveling wave head detection signal is an input signal of the second not gate operation module, the negative polarity traveling wave head detection signal S13 is an input signal of the second not gate operation module, the second not gate operation module outputs a non-negative polarity traveling wave head detection signal-S13, and the signal-S13 is used as an input signal of the first and gate operation module; a first NOT gate operation module is also arranged between the OR gate operation module and the second AND gate operation module, the positive polarity traveling wave head detection signal S12 is an input signal of the first NOT gate operation module, the first NOT gate operation module outputs a non-positive polarity traveling wave head detection signal-S12, and the signal-S12 is used as an input signal of the second AND gate operation module; in such an arrangement, the input signals of the first and gate operation module are not labeled as S6, S7 and-S13, and the logical and operation is performed on three types, and if the three types are all satisfied, it is determined that the positive-polarity traveling wave detection signal S12 is obtained, and similarly, the input signals of the second and gate operation module are not labeled as S5, S8 and-S12, and the logical and operation is performed on the three types, and if the three types are all satisfied, it is determined that the negative-polarity traveling wave detection signal is obtained; in this embodiment, the input signals of the or gate operation module are S5, S6, S12 and S13, respectively, and the four are logically or-operated to determine that the traveling wave front sudden change signal S11 is generated, so that the occurrence of the traveling wave front detection error is greatly reduced.
Example 2:
the utility model also provides a traveling wave head detection method, which comprises the following steps:
the signal input of the double-shielded coaxial cable is respectively input into the positive wave head detection module and the negative wave head detection module;
if the positive polarity wave head detection module detects that the positive change rate level is higher than the first voltage set value, judging that a traveling wave head mutation signal is generated, keeping the positive change rate level within a certain time, and judging that a fault traveling wave is generated and generating a positive polarity traveling wave head detection signal if the positive peak level is higher than the second voltage set value during the period;
if the negative polarity wave head detection module detects that the negative change rate level is higher than the first voltage set value, judging to generate a traveling wave head mutation signal, keeping the negative change rate level within a certain time, and judging to be a fault traveling wave and generating a negative polarity traveling wave head detection signal if the negative peak value level is higher than the second voltage set value during the certain time;
the positive polarity traveling wave head detection signal and the negative polarity traveling wave head detection signal are used as input signals of an OR gate operation module to carry out OR operation so as to obtain a traveling wave head mutation signal.
In a preferred embodiment, the first voltage setting value is 0.3V, the second voltage setting value is 1V, and the certain time is at least 10 μ s.
As a preferred embodiment, when the positive polarity traveling wave head detection signal or the negative polarity traveling wave head detection signal is generated, the traveling wave head sudden change signal is held for 1ms, while the positive polarity traveling wave head detection signal or the negative polarity traveling wave head detection signal is held for 1ms, to prevent multiple triggering of reflecting and refracting the traveling wave.
Example 3:
the utility model also provides a traveling wave detection module, which comprises a capacitive voltage sensor, an overvoltage protection module, a voltage division module, a signal transmission cable and the traveling wave signal processing unit which are electrically connected in sequence, wherein the capacitive voltage sensor is used for transmitting and transforming high-frequency transient signals and inhibiting low-frequency signals, the overvoltage protection module is used for preventing overvoltage signals from entering the traveling wave signal processing unit, the voltage division module is used for reducing the voltage signals to the level required by the traveling wave head, and the traveling wave signal processing unit is used for detecting and identifying the traveling wave head so as to accurately detect the initial moment of the traveling wave head; a capacitive voltage sensor is adopted to transmit and transform a high-frequency transient signal, so that a low-frequency signal is suppressed, and an accurate signal is provided for a traveling wave head detection module; the overvoltage protection module is used for protecting overvoltage under the condition of lightning and other extreme conditions, because overvoltage is usually generated when a power system breaks down, in order to protect the traveling wave signal processing unit and avoid the damage to the traveling wave signal processing unit caused by the entering of overvoltage signals; the amplitude of the input signal is reduced to the voltage required by the traveling wave head detection module through the voltage division module, and due to the characteristics of high-frequency signal transmission, the impedance matching problem of the resistance of the voltage division module and a signal cable needs to be considered, so that the high-frequency signal is prevented from being reflected at the junction of the cable and the sensor, and the purpose of reducing the signal-to-noise ratio is achieved.
As a preferred embodiment, the overvoltage protection module includes a resistor R1, a diode D1, and a varistor RV1, the diode D1 and the resistor R1 are respectively connected in parallel with the varistor RV1, and the resistor R1 is grounded.
As a preferred embodiment, the transient voltage regulator comprises a first transient diode TVS1, a second transient diode TVS2, a resistor R2 and a resistor R3, wherein the resistor R2 and the resistor R3 are connected in parallel, and the first transient diode TVS1 and the second transient diode TVS2 are connected in series in reverse in sequence, and are used for controlling the voltage across the resistor R2 and the resistor R3.
As a preferred embodiment, the overvoltage protection module and the voltage division module are electrically connected through a coaxial cable.
In a preferred embodiment, the voltage dividing module and the traveling wave signal processing unit are electrically connected through a coaxial cable.
As a preferred embodiment, the traveling wave signal processing unit includes a clock for accurately recording the arrival time of the traveling wave pulse signal, so as to accurately locate the fault.
As a preferred embodiment, the clock includes but is not limited to a GPS1PPS (second) pulse synchronous clock or a beidou synchronous clock, and when in use, the clock travel time error is controlled to be 10 ns/s; when the transient current traveling wave pulse signal appears, the signal detection starting module overturns, and the clock accurately records the arrival time of the traveling wave pulse signal, so that the fault is accurately positioned.
The foregoing is a detailed description of the utility model, and specific examples are used herein to explain the principles and implementations of the utility model, the above description being merely intended to facilitate an understanding of the principles and core concepts of the utility model. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A traveling wave signal processing unit is characterized by comprising a positive polarity wave head detection module, a negative polarity wave head detection module and an OR gate operation module, wherein the positive polarity wave head detection module and the negative polarity wave head detection module are connected in parallel; the positive polarity wave head detection module is used for detecting a positive polarity wave head generated signal, the negative polarity wave head detection module is used for detecting a negative polarity wave head generated signal, and an output signal of the positive polarity wave head detection module and an output signal of the negative polarity wave head detection module are used as input signals of the OR gate operation module to carry out OR operation to obtain a traveling wave head mutation signal.
2. The traveling wave signal processing unit according to claim 1, wherein the positive polarity wavefront detection module comprises a positive change rate level setting module, a positive peak level setting module and a first and gate operation module, the positive change rate level setting module and the positive peak level setting module are connected in parallel, and signal output ends of the positive change rate level setting module and the positive peak level setting module are connected with a signal input end of the first and gate operation module and perform and operation at the first and gate operation module to obtain the positive polarity traveling wave wavefront detection signal.
3. The traveling wave signal processing unit of claim 2, wherein the positive rate of change level setting module comprises a first differential module, a first level comparison module and a first high level holding module connected in series in sequence; the positive peak level setting module comprises a second level comparison module.
4. The traveling-wave signal processing unit according to claim 2 or 3, wherein the positive-polarity wavefront detection module further comprises a third high-level holding module, and a signal input terminal of the third high-level holding module is electrically connected to an output terminal of the first AND gate operation module.
5. The traveling wave signal processing unit according to any one of claims 1 to 3, wherein the negative polarity wave head detection module comprises a negative change rate level setting module, a negative peak level setting module and a second AND gate operation module, the negative change rate level setting module and the negative peak level setting module are connected in parallel, and signal output ends of the negative change rate level setting module and the negative peak level setting module are connected with a signal input end of the second AND gate operation module and are subjected to AND operation at the second AND gate operation module to obtain a negative polarity traveling wave head detection signal.
6. The traveling wave signal processing unit of claim 5, wherein the negative change rate level setting module comprises a second differential module, a third level comparison module and a second high level holding module connected in series in sequence; the negative peak value level setting module comprises a fourth level comparison module.
7. The traveling-wave signal processing unit of claim 5, wherein the negative polarity wavefront detection module further comprises a fourth high-level holding module, and a signal input end of the fourth high-level holding module is electrically connected to an output end of the second AND gate operation module.
8. The traveling-wave signal processing unit according to claim 2, wherein a second not gate operation module is further provided between the or gate operation module and the first and gate operation module, and the negative traveling-wave header detection signal is an input signal of the second not gate operation module.
9. A traveling wave detection module, comprising a capacitive voltage sensor, an overvoltage protection module, a voltage division module, a signal transmission cable and the traveling wave signal processing unit as claimed in any one of claims 1 to 8, which are electrically connected in sequence, wherein the capacitive voltage sensor is configured to transmit a high frequency transient signal and suppress a low frequency signal, the overvoltage protection module is configured to prevent an overvoltage signal from entering the traveling wave signal processing unit, the voltage division module is configured to reduce the voltage signal to a level required by the traveling wave head, and the traveling wave signal processing unit is configured to detect and identify the traveling wave head so as to accurately detect an initial time of the traveling wave head.
10. The traveling wave detection module of claim 9, the traveling wave signal processing unit further comprising a clock for accurately recording the traveling wave pulse signal arrival time.
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