WO2016019666A1 - Procédé et dispositif de détection de décharge partielle de câble - Google Patents

Procédé et dispositif de détection de décharge partielle de câble Download PDF

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Publication number
WO2016019666A1
WO2016019666A1 PCT/CN2014/093192 CN2014093192W WO2016019666A1 WO 2016019666 A1 WO2016019666 A1 WO 2016019666A1 CN 2014093192 W CN2014093192 W CN 2014093192W WO 2016019666 A1 WO2016019666 A1 WO 2016019666A1
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Prior art keywords
partial discharge
signal
sensor
pulse
cable
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PCT/CN2014/093192
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English (en)
Chinese (zh)
Inventor
任志刚
程序
陶诗洋
栾逢时
王文山
齐伟强
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国家电网公司
国网北京市电力公司
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Publication of WO2016019666A1 publication Critical patent/WO2016019666A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing

Definitions

  • the present invention relates to the field of power equipment detection, and in particular to a method and apparatus for detecting partial discharge of a cable.
  • XLPE power cable has been widely used due to its reasonable process and structure, strong acid and alkali resistance, corrosion resistance, simple installation and installation, and less operation and maintenance. .
  • the power cable runs in the underground for a long time, such as moisture, pollution, damage to people and vehicles, etc., combined with the effect of voltage, it is prone to aging of electric tree branches and aging of water trees.
  • the aging of the XLPE cable leads to a decrease in the insulation resistance, an increase in the leakage cable, and finally a breakdown failure, causing a huge loss. Therefore, the detection of XLPE power cables is important to ensure reliable operation of the power system and extend the service life of the cable.
  • the main object of the present invention is to provide a method and apparatus for detecting partial discharge of a cable to solve the above problem.
  • a method for detecting partial discharge of a cable comprising: coupling a coupled signal from a cable to be tested by a coupled sensor; and performing signal conditioning analysis on the coupled signal to obtain a measured Partial discharge signal on the cable; the partial discharge signal is used to determine the location of the partial discharge on the cable under test.
  • the coupling sensor includes at least one of an inductively coupled sensor, a capacitively coupled sensor, and an antenna receiving sensor.
  • coupling the signal from the cable under test by the coupled sensor comprises: when the coupled sensor is an inductively coupled sensor, the inductively coupled sensor senses a pulse current to obtain a coupled signal, wherein the pulse current is a partial discharge of the cable under test on the cable under test. a discharge current flowing through the metal shield; when the coupled sensor is an inductively coupled sensor, the capacitive coupled sensor couples the coupled signal through a detection loop formed by the coupling capacitor and the sense impedance; and when the coupled sensor is the antenna receive sensor, the antenna receive sensor passes The UHF electromagnetic wave is received to obtain a coupled signal, wherein the UHF electromagnetic wave is an electromagnetic wave excited and propagated by a steep pulse generated by partial discharge of the tested cable.
  • performing signal conditioning analysis on the coupled signal to obtain a partial discharge signal on the cable under test includes: performing signal on the coupled signal by using at least one of a difference method, a polarity discrimination method, a directional coupling method, and a delay analysis method Conditioning analysis yields the operation of the partial discharge signal on the cable under test.
  • determining the position at which the partial discharge occurs on the cable under test by using the partial discharge signal comprises: acquiring a first time when the first pulse reaches the test end of the cable under test, wherein the first pulse is a raw pulse; and acquiring the second pulse arrives at the measured The second time of the test end of the cable, wherein the second pulse is a reflected pulse, the reflected pulse is a pulse that wants to test the opposite end propagation after the partial discharge occurs, and is transmitted to the test end after being tested by the opposite end; according to the first time and the first The time difference between the two times determines where the partial discharge occurs.
  • determining a position at which partial discharge occurs on the cable under test using the partial discharge signal includes: acquiring a partial discharge signal of the plurality of measurement positions; determining a frequency of the partial discharge signal in the frequency domain by using frequency components and time lengths of the plurality of partial discharge signals Poor; when the standard deviation meets the preset threshold, the measurement position of the partial discharge signal corresponding to the deviation is determined to be the position at which the partial discharge occurs.
  • determining the position at which the partial discharge occurs on the cable under test using the partial discharge signal includes: obtaining the arrival time of the same partial discharge signal at different measurement positions; determining the position at which the partial discharge occurs using the arrival time.
  • a device for detecting partial discharge of a cable comprising: a coupling unit for coupling a coupling signal from a cable to be tested by a coupling sensor; a signal processing unit, It is used for signal conditioning analysis of the coupled signal to obtain a partial discharge signal on the cable under test; a position determining unit for determining a position at which a partial discharge occurs on the cable under test using the partial discharge signal.
  • the coupling sensor includes at least one of an inductively coupled sensor, a capacitively coupled sensor, and an antenna receiving sensor.
  • the coupling unit includes: a first coupling module, wherein when the coupled sensor is an inductively coupled sensor, the inductively coupled sensor senses a pulse current to obtain a coupled signal, wherein the pulse current is a partial shield of the tested cable to the metal shield of the cable under test a discharge current flowing through the layer; a second coupling module, wherein when the coupled sensor is an inductively coupled sensor, the capacitive coupling sensor couples the coupling signal through a detection loop formed by a coupling capacitor and a detection impedance; and a third coupling module is used for coupling When the sensor receives the sensor for the antenna, the antenna receiving sensor obtains a coupled signal by receiving UHF electromagnetic waves, wherein the UHF electromagnetic wave is an electromagnetic wave excited and propagated by a steep pulse generated by partial discharge of the tested cable.
  • the signal processing unit includes: a signal processing module, configured to perform signal conditioning analysis on the coupled signal by using at least one of a difference method, a polarity discrimination method, a directional coupling method, and a delay analysis method to obtain a cable to be tested. The operation of the partial discharge signal.
  • the position determining unit includes: a first acquiring module, configured to acquire a first time when the first pulse reaches the test end of the cable under test, wherein the first pulse is a raw pulse; and the second acquiring module is configured to acquire the second pulse a second time of reaching the test end of the cable under test, wherein the second pulse is a reflected pulse, the reflected pulse is a pulse that wants to test the opposite end propagation after the partial discharge is generated, and is transmitted to the test end after being tested by the opposite end; And a module, configured to determine a location at which partial discharge occurs according to a time difference between the first time and the second time.
  • the location determining unit includes: a third acquiring module, configured to acquire a partial discharge signal of the plurality of measurement locations; and a second determining module, configured to determine a partial discharge signal in the frequency by using frequency components and time lengths of the plurality of partial discharge signals
  • the third determining module is configured to determine, when the standard deviation meets the preset threshold, that the measurement position of the partial discharge signal corresponding to the standard deviation is a position at which partial discharge occurs.
  • the position determining unit comprises: a fourth acquiring module, configured to acquire an arrival time of the same partial discharge signal at different measurement positions; and a fourth determining module, configured to determine a position at which partial discharge occurs using the arrival time.
  • the coupled signal is obtained by coupling the sensor, and the signal is subjected to conditioning analysis to remove the interference signal in the coupled signal to obtain a partial discharge signal on the cable under test, and then the partial discharge signal is used to determine the position of the partial discharge on the tested cable. .
  • the problem of detecting the partial discharge in the prior art is not high, and the effect of accurately monitoring the position of the partial discharge of the cable under test is achieved.
  • FIG. 1 is a flow chart of a method for detecting partial discharge of a cable according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a capacitive coupling sensor of an external structure according to an embodiment of the invention
  • FIG. 3 is a schematic diagram of raw pulses and reflected pulses in accordance with an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a device for detecting partial discharge of a cable according to an embodiment of the present invention.
  • Partial discharge when the applied voltage is generated in the electrical equipment, is strong enough to cause the insulating portion to discharge, but such a discharge phenomenon in which no fixed discharge channel is formed in the discharge region is called partial discharge.
  • FIG. 1 is a flow chart of a method for detecting partial discharge of a cable according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step S102 coupling the sensor to obtain a coupled signal from the cable under test.
  • Step S104 performing signal conditioning analysis on the coupled signal to obtain a partial discharge signal on the cable under test.
  • step S106 the partial discharge signal is used to determine the position at which the partial discharge occurs on the cable under test.
  • the coupled signal is obtained by coupling the sensor, and the signal is subjected to conditioning analysis to remove the interference signal in the coupled signal to obtain a partial discharge signal on the cable under test, and then the partial discharge signal is used to determine the position of the partial discharge on the tested cable. .
  • the problem of detecting the partial discharge in the prior art is not high, and the effect of accurately monitoring the position of the partial discharge of the cable under test is achieved.
  • the coupling sensor includes at least one of an inductively coupled sensor, a capacitively coupled sensor, and an antenna receiving sensor.
  • the partial discharge signal of the cable under test can be effectively and reliably coupled out from the cable under test.
  • coupling the coupled signal from the cable under test by the coupling sensor may include: when the coupled sensor is an inductively coupled sensor, the inductively coupled sensor senses a pulse current to obtain a coupled signal, wherein the pulse current a discharge current that partially discharges the cable under test in the metal shield of the cable under test; when the coupled sensor is an inductively coupled sensor, the capacitively coupled sensor couples the coupled signal through a detection loop formed by the coupling capacitor and the sense impedance; When receiving the sensor for the antenna, the antenna receiving sensor obtains a coupled signal by receiving UHF electromagnetic waves, wherein the UHF electromagnetic wave is an electromagnetic wave excited and propagated by a steep pulse generated by partial discharge of the tested cable.
  • the inductively coupled sensor can couple energy from a magnetic field generated by partial discharge and then convert the electrical signal into an electrical signal.
  • the discharge pulse current will propagate along the axial direction of the cable under test, and a magnetic field will be generated on a plane perpendicular to the direction of current propagation, from which the discharge signal is coupled (ie, in the above embodiment) Coupling signal).
  • a wide-band Rogowski coil type current sensor with a ferrite core can be used as the inductively coupled sensor.
  • a built-in inductively coupled sensor can be used that is mounted on a metal shielded connection inside the cable connector.
  • the built-in sensor has small caliper, high sensitivity and low external electromagnetic interference.
  • the senor can also be constructed as a clamp-type portable or external sensor that is temporarily or permanently attached to the exterior of the cable body at both ends of the connector.
  • a wideband Rogowski coil structure current sensor is generally used, which is mainly placed at the metal shield ground lead at one end of the cable under test, the intermediate joint metal shield connection line, the cable body, and the single-phase cable of the three-core cable.
  • a pulse current flows through the ground wire and the metal shield layer, and when it passes through the sensor, a signal is induced on the secondary winding, so that partial discharge information can be obtained (ie, the coupling in the above embodiment) signal).
  • the external sensor is easy to install and has no effect on the cable body.
  • the metal shield of the cable can induce the pulse current signal and pass it through the current sensor, and the sensor can detect the PD signal.
  • a partial discharge pulse of the helical structure grounding shielded cable is ns-level
  • a partial discharge current pulse in the grounded shield can be divided into a component along the cable direction and a tangential component.
  • the latter ie, the split vector
  • the net flux of the coil wound on the outer shield of the cable is proportional to the tangential current, which can be judged by the magnitude of the net flux on the coil. Partial discharge.
  • the capacitive coupling sensor can be used to obtain the coupling signal.
  • the existing metal structure in the cable and its connector can be used, or a metal foil can be additionally mounted to form the capacitive electrode.
  • the first capacitor and the second capacitor together form a coupling capacitor, and a section of the outer semiconductive layer of the cable is used as a detection impedance to couple the partial discharge signal.
  • a VHF capacitively coupled sensor is also provided. Specifically, a cable to be tested close to the joint is taken, a part of the outer sheath is peeled off, and a metal foil is attached to the outer semi-conductive layer as an electrode, and a signal is taken out from the electrode, and the cut metal shield layer is connected by a wire.
  • the semiconducting layer can be regarded as the power frequency ground potential, so the capacitive coupler (ie, the capacitive coupling sensor in the above embodiment) does not affect the cable.
  • the insulation is subjected to the effect of high frequency and high frequency.
  • the impedance of the outer semiconducting layer is comparable to the impedance of the insulating layer, while the metal shielding layer is at ground potential, and the high frequency signal can be taken out from the semiconducting layer for measurement. Adjusting the length D of the peeling sheath, the length D1 of the metal foil, and the length D2 between the metal foil and the sheath can obtain the optimum signal-to-noise ratio of the sensor.
  • the sensor has a maximum frequency of 500MHz and can be used as an ultra-high frequency measurement sensor for cables and accessories. It has high sensitivity and good anti-interference effect.
  • the detection sensor is in the cable, the good shielding of the cable ensures the detection sensitivity of the signal, and the measuring device is simple.
  • an embodiment of the present invention further provides a capacitive coupling sensor with an external structure.
  • a pair of metal electrodes are mounted on the insulating cylinder of the cable joint 1 (the shielding layer in the middle of the joint is separated), and the two metal electrodes are connected by the detecting impedance 3, and the two metal electrodes 2 are spaced apart. Insulating gasket 4.
  • the two equivalent capacitors C1 and C2 formed by the metal shielding layer and the core conductor form the equivalent capacitances C3 and C4, and the Zd is the detection impedance.
  • the equivalent capacitance (C2 and C4) on the other side can be used as a coupling loop and a sense impedance to form a detection loop to couple the partial discharge signal.
  • the capacitive coupling sensor in the above embodiment of the present invention may further have a corresponding hardware signal conditioning circuit, including a broadband high-pass filter, a broadband amplifier, a power frequency zero-crossing comparison unit, a detection circuit, a high-speed digital acquisition card, an industrial computer, and the like;
  • the detection system can be used to complete functions such as signal acquisition, analysis, and storage.
  • the external capacitive coupling sensor can directly attach the metal electrode to the insulation barrel of the cable connector without touching any parts inside the cable connector.
  • the installation is also very simple and suitable for live detection.
  • the coupling signal can be acquired by a UHF antenna receiving sensor.
  • the PD signal (the PD signal, that is, the partial discharge signal, that is, the coupled signal in the above embodiment) can be detected by using the installed antenna sensor to receive UHF electromagnetic waves excited and propagated by the PD steep pulse.
  • the anti-low-frequency interference capability is strong, and the PD source can be positioned.
  • different defect types can be distinguished, and at the same time, long-term on-site monitoring can be performed, and the sensitivity can meet the engineering requirements.
  • the antenna in the above embodiment may have an antenna such as a two-armed Archimedes spiral antenna, a rod antenna, or a probe sensor.
  • an antenna such as a two-armed Archimedes spiral antenna, a rod antenna, or a probe sensor.
  • multiple sensors can be mounted during testing and mounted as close as possible to the connector or end of the cable. Further, the use of UHF antenna receiving sensors has higher sensitivity.
  • performing signal conditioning analysis on the coupled signal to obtain a partial discharge signal on the cable under test includes: performing at least one of a difference method, a polarity discrimination method, a directional coupling method, and a delay analysis method.
  • the signal conditioning analysis of the coupled signal results in the operation of the partial discharge signal on the cable under test.
  • the internal discharge signal and the external noise signal can be identified, that is, the coupled coupled signal is de-asserted, thereby improving the reliability of the detection.
  • a pair of coupled sensors with the same performance and structure can be used to obtain a bridge differential balancing circuit, and the difference between the response of the two coupled sensors by the true discharge signal and the external interference signal on the cable under test is obtained.
  • the internal discharge signal is enhanced, and the external interference signal is removed to obtain a partial discharge signal.
  • a pair of sensors having the same performance and structure can be used, and two sensors are symmetrically mounted on both ends of the cable under test, and C0 and R0 constitute a detection impedance for coupling signals, and coupling signals are coupled from both ends (eg, The output of the A terminal and the B terminal) is input and input into the industrial computer through the acquisition and amplification, and finally the software is used to realize the signal analysis and processing work such as polarity discrimination.
  • the pulse current propagates to both sides, and the direction of passing through the two sensors is opposite.
  • the polarities of the signals coupled to the ends of A and B are also opposite, and are retained by the software to obtain a partial. Discharge signal; when external interference passes, the direction of passing through the two sensors is the same, and the polarities of the signals coupled to both ends of A and B are also the same, and are deleted after being recognized by software.
  • the coupled sensor can be a directional coupled sensor.
  • the sensor has two output ports, each of which corresponds to a pulse signal from different directions (forward and reverse), and can adopt a capacitive coupling or an inductive coupling method, and the main characteristic parameters thereof.
  • the coupling coefficient characterizes the ability of the sensor to couple the pulse signal
  • the directionality characterizes the ability to distinguish between the forward-propagating pulse and the back-propagating pulse.
  • the directional coupling sensor is mounted on the outer semiconducting layer (in the metal sheath) at both ends of the cable joint, and the output ends are A, B and C, D.
  • the four outputs A, B, C, and D have different responses V A , V B , V C , and V D .
  • the directivity of the sensor is 1:2 (6 dB)
  • the pulse signal from the left side of the cable, V A ⁇ 2V B , V C ⁇ 2V D is regarded as an external interference signal;
  • the pulse signal from the right side of the cable, V B ⁇ 2V A , V D ⁇ 2V C It is also considered as an external disturbance signal;
  • the pulse that propagates from the inside of the joint to both sides: V B ⁇ 2V A , V C ⁇ 2V D is regarded as the internal discharge signal of the joint.
  • a pair of sensors with the same performance and structure can be used to determine whether the internal discharge or the external disturbance is based on the difference in the delay of the discharge pulse reaching the two sensors.
  • the two sensors A and B can be respectively installed at the joints at both ends of the cable to be tested, and the coupling signal is transmitted to the partial discharge detector through the coaxial cable (long-distance transmission requires optical fiber), and then the partial discharge signal and interference are distinguished by time delay analysis. signal.
  • the time interval of the signals to which the two sensors are coupled is ⁇ t
  • the propagation speed of the known pulse signal in the cable is v
  • the length of the cable under test is L
  • the interference signal from the outside the delay interval ⁇ t n is the minimum which is:
  • the detection system detects the time interval of the two signals When it is considered to be the internal discharge of the cable under test; When it is considered to be external interference.
  • the position of the partial discharge can also be located by the processing method.
  • the defect of the cable can be accurately evaluated by determining the partial discharge position.
  • determining the position at which the partial discharge occurs on the cable under test by using the partial discharge signal may further include: acquiring a first time when the first pulse reaches the test end of the cable under test, wherein the first pulse is a raw pulse; Obtaining a second time when the second pulse reaches the test end of the cable under test, wherein the second pulse is a reflected pulse, and the reflected pulse is a pulse that wants to test the opposite end propagation after the partial discharge occurs, and is propagated to the test end after being tested by the opposite end.
  • the position at which the partial discharge occurs is determined based on the time difference between the first time and the second time.
  • the signal A of the original pulse is a signal (the near end) where the source pulse directly reaches the first end after the partial discharge occurs
  • the signal pulse B detected by the detecting device is the PD source signal.
  • the pulse generated by the far-end reflection reaches the proximal end
  • C is the signal generated by the B-generated signal reaching the proximal end and then being reflected by the distal end and then reaching the proximal end.
  • the pulse will travel along the cable in two opposite directions, one of which passes the time t1 to the test end (the pulse is the original pulse); A pulse propagates to the opposite end of the test and reflects at the opposite end of the test, then propagates to the test end, and reaches the test end after time t2.
  • the position where the PD occurs that is, the position at which the partial discharge occurs
  • Q the energy of the pulse in which the partial discharge occurs
  • v is the speed at which the pulse propagates.
  • determining a position at which partial discharge occurs on the cable under test using the partial discharge signal includes: acquiring partial discharge signals of the plurality of measurement positions; using frequency components and time lengths of the plurality of partial discharge signals Determining the deviation of the partial discharge signal in the frequency domain; when the deviation meets the preset threshold, determining the measurement position of the partial discharge signal corresponding to the deviation is the position at which the partial discharge occurs.
  • the processing method is a method based on comparing time-frequency domain characteristics of PD pulses (ie, pulses of partial discharge) measured from different positions.
  • PD pulses ie, pulses of partial discharge
  • the influence of the PD pulse as it propagates along the cable under test can be explained by the fault pre-positioning bit: the closer the fault point is, the more the PD will exhibit large values, large frequency components and small time lengths.
  • the attenuation causes it to produce smaller amplitude and frequency components, and dispersion increases the length of time.
  • T and F are used as a way to attenuate noise and extract PD pulses from different waveforms, most likely associated with different PD sources.
  • the process of calculating T and F is as follows. First, the pulse energy is normalized to 1 so that the scales of the T and F values are unchanged.
  • the deviation F of s in the frequency domain can be calculated.
  • the parameters T and F are strongly influenced by the shape of the PD pulse.
  • the PD source pulse near the coupled sensor will exhibit a lower T value and a higher F value.
  • a farther PD source pulse eg, a corona pulse produced by the measuring device at the joint
  • This feature allows the PD source pulses at different locations of the PD pulse to be differentiated.
  • the noise pulse often exhibits a lower F value due to, for example, the action of the electrical switch of the resonant test equipment.
  • the process of separately pulse is as follows.
  • the TF values are first merged into a Cartesian plan (TF map).
  • the identified similar waveform pulse forming groups are in the TF spectrogram, and the similar TF values are grouped together.
  • the cluster obtained by this process is separately calculated as a series of pulse values of a noise or a PD pulse [32-34].
  • positioning can be performed by comparing PD pulse peak and F value comparison analysis at different points along the cable line.
  • the PD pulse characteristics at different locations can be obtained by statistical comparison of the data.
  • each set of recorded partial discharge pulses can be represented by a mean value difference F and a high approximation (here 98%) of the measure distribution values.
  • PD pulses recorded at different locations can be evenly divided into groups in the form of T and F values; 2) each PD phenomenon that can be identified by distinguishing data, mainly in PD source mode The characteristics are reference; 3) For each PD phenomenon, a histogram (AF map) of the average F value at different positions and the percentage of its distribution metric should be drawn; 4) AF map analysis positioning: if there is the largest The F value and the 98% percentile (ie, the frequency range F of the frequency domain meets the preset threshold), then here is the PD source location.
  • AF map histogram
  • determining the position at which the partial discharge occurs on the cable under test using the partial discharge signal includes: obtaining the arrival time of the same partial discharge signal at different measurement positions; determining the position at which the partial discharge occurs using the arrival time.
  • samples can be simultaneously detected from different measurement positions by two or more sensors, and can be positioned by calculating the arrival times of the same PD signals at different sensors. If the propagation speed of the pulse is known, know the exact length of the cable, and the different arrival times, the position of the PD source can be calculated, which can be accurate to several meters.
  • the position of the comparison pulse can be obtained, and the pulses detected by connectors #3 and #5 are almost simultaneously reached, then it can be determined that the PD source is in the middle of the two connectors, ie Connector 4.
  • the detecting device may include a coupling unit 10, a signal processing unit 20, and a position determining unit 30.
  • the coupling unit is configured to couple the coupled signal from the cable under test by the coupled sensor; the signal processing unit is configured to perform signal conditioning analysis on the coupled signal to obtain a partial discharge signal on the cable under test; and a position determining unit for use The partial discharge signal determines where the partial discharge occurs on the cable under test.
  • the coupled signal is obtained by coupling the sensor, and the signal is subjected to conditioning analysis to remove the interference signal in the coupled signal to obtain a partial discharge signal on the cable under test, and then the partial discharge signal is used to determine the position of the partial discharge on the tested cable. .
  • the problem of detecting the partial discharge in the prior art is not high, and the effect of accurately monitoring the position of the partial discharge of the cable under test is achieved.
  • the coupling sensor includes at least one of an inductively coupled sensor, a capacitively coupled sensor, and an antenna receiving sensor.
  • the coupling unit includes: a first coupling module, wherein when the coupled sensor is an inductively coupled sensor, the inductively coupled sensor senses a pulse current to obtain a coupled signal, wherein the pulse current is a partial shield of the tested cable to the metal shield of the cable under test a discharge current flowing through the layer; a second coupling module, wherein when the coupled sensor is an inductively coupled sensor, the capacitive coupling sensor couples the coupling signal through a detection loop formed by a coupling capacitor and a detection impedance; and a third coupling module is used for coupling When the sensor receives the sensor for the antenna, the antenna receiving sensor obtains a coupled signal by receiving UHF electromagnetic waves, wherein the UHF electromagnetic wave is an electromagnetic wave excited and propagated by a steep pulse generated by partial discharge of the tested cable.
  • the signal processing unit includes: a signal processing module, configured to perform signal conditioning analysis on the coupled signal by using at least one of a difference method, a polarity discrimination method, a directional coupling method, and a delay analysis method to obtain a cable to be tested. The operation of the partial discharge signal.
  • the position determining unit includes: a first acquiring module, configured to acquire a first time when the first pulse reaches the test end of the cable under test, wherein the first pulse is a raw pulse; and the second acquiring module is configured to acquire the second pulse a second time of reaching the test end of the cable under test, wherein the second pulse is a reflected pulse, the reflected pulse is a pulse that wants to test the opposite end propagation after the partial discharge is generated, and is transmitted to the test end after being tested by the opposite end; And a module, configured to determine a location at which partial discharge occurs according to a time difference between the first time and the second time.
  • the location determining unit includes: a third acquiring module, configured to acquire a partial discharge signal of the plurality of measurement locations; and a second determining module, configured to determine a partial discharge signal in the frequency by using frequency components and time lengths of the plurality of partial discharge signals
  • the third determining module is configured to determine, when the standard deviation meets the preset threshold, that the measurement position of the partial discharge signal corresponding to the standard deviation is a position at which partial discharge occurs.
  • the location determining unit may include: a fourth acquiring module, configured to acquire an arrival time of the same partial discharge signal at different measurement positions; and a fourth determining module, configured to determine a position at which partial discharge occurs using the arrival time.
  • the modules provided in this embodiment are the same as the methods used in the corresponding steps of the method embodiment, and the application scenarios may be the same.
  • the solution involved in the foregoing module may not be limited to the content and scenario in the foregoing Embodiment 1, and the foregoing module may be run on a computer terminal or a mobile terminal, and may be implemented by software or hardware.
  • the coupled signal is obtained by coupling the sensor, and the signal is subjected to conditioning analysis to remove the interference signal in the coupled signal to obtain a partial discharge signal on the cable under test, and then the partial discharge signal is used to determine the position of the partial discharge on the tested cable. .
  • the problem of detecting the partial discharge in the prior art is not high, and the effect of accurately monitoring the position of the partial discharge of the cable under test is achieved.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in a storage device by a computing device, or they may be fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

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  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)
  • Locating Faults (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour détecter la décharge partielle d'un câble. Le procédé consiste : à acquérir, par l'intermédiaire d'un couplage, un signal couplé provenant d'un câble détecté à l'aide d'un capteur de couplage (S102) ; à mettre en œuvre un conditionnement et une analyse de signal sur le signal couplé pour obtenir un signal de décharge partielle sur le câble détecté (S104) ; et à utiliser le signal de décharge partielle pour déterminer une position de décharge partielle sur le câble détecté (S106). Le procédé résout le problème de l'état de la technique, selon lequel la précision de détection de décharge partielle n'est pas élevée, et l'effet de détection précise de la position de décharge partielle du câble détecté est obtenu.
PCT/CN2014/093192 2014-08-07 2014-12-05 Procédé et dispositif de détection de décharge partielle de câble WO2016019666A1 (fr)

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CN201410387603.1A CN105334433B (zh) 2014-08-07 2014-08-07 电缆局部放电的检测方法及装置
CN201410387603.1 2014-08-07

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CN112307969B (zh) * 2020-10-30 2024-03-12 全球能源互联网欧洲研究院 一种脉冲信号的分类辨识方法、装置及计算机设备
CN112542075A (zh) * 2020-11-30 2021-03-23 广东电网有限责任公司 一种xlpe电缆局放仿真方法及其系统
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CN112557849A (zh) * 2020-12-04 2021-03-26 广东电网有限责任公司江门供电局 一种配电电缆线路综合检测装置性能验证平台
CN112557858A (zh) * 2020-12-09 2021-03-26 南京蓝园精瑞电气有限公司 一种用于环网柜的局部放电特高频信号采集系统
CN112986766A (zh) * 2021-02-25 2021-06-18 西安西电开关电气有限公司 一种局部放电定位方法、装置、存储介质和设备
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CN114325250B (zh) * 2021-11-16 2024-02-27 国网天津市电力公司电力科学研究院 集成定位检测与图谱检测功能的局部放电检测装置及方法
CN114325250A (zh) * 2021-11-16 2022-04-12 国网天津市电力公司电力科学研究院 集成定位检测与图谱检测功能的局部放电检测装置及方法
CN114035001A (zh) * 2021-11-16 2022-02-11 国网福建省电力有限公司电力科学研究院 变压器耐压试验高频多端局部放电检测定位方法及装置
CN114878994B (zh) * 2022-07-11 2022-09-27 杭州世创电子技术股份有限公司 一种基于空间特高频传感器的局放信号检测方法及系统
CN114878994A (zh) * 2022-07-11 2022-08-09 杭州世创电子技术股份有限公司 一种基于空间特高频传感器的局放信号检测方法及系统
CN116026416A (zh) * 2023-02-24 2023-04-28 国网江西省电力有限公司电力科学研究院 一种多方位电缆接头监测装置
CN116026416B (zh) * 2023-02-24 2023-08-15 国网江西省电力有限公司电力科学研究院 一种多方位电缆接头监测装置

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