CN108152666B - Method and system for detecting partial discharge of cable - Google Patents
Method and system for detecting partial discharge of cable Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting partial discharge of a cable. Wherein, the method comprises the following steps: detecting a discharge pulse signal of the cable by a plurality of detection devices, wherein the plurality of detection devices are installed at different positions of the cable; transmitting a clock synchronization signal to the plurality of detection devices in a case where any one of the plurality of detection devices detects the discharge pulse signal; and determining the position of a discharge source on the cable according to the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signal. The invention solves the technical problem that the positioning result is inaccurate easily caused by independent work among a plurality of detection devices in the existing cable partial discharge detection method under the condition that a plurality of discharge sources exist.
Description
Technical Field
The invention relates to the field of power grid monitoring, in particular to a method and a system for detecting partial discharge of a cable.
Background
In the field, in order to ensure the normal operation of a power grid, the fault of a power grid cable needs to be monitored, and in a plurality of cable test means, a partial discharge test can intuitively and effectively reflect the defects influencing the service life and the safe operation of the cable. Partial discharge is used as a main expression form of the early stage of the insulation fault of the high-voltage cable line, is not only a main cause of insulation aging, but also a main characteristic parameter for representing the insulation condition, has important significance for fault diagnosis of power equipment, and the partial discharge of the cable is used as one of key states for measuring the health condition of the cable line.
At present, the existing local online detection scheme is to install sensors on the cable intermediate joint and the grounding wire of the cable terminal, and the sensors couple energy from the magnetic field generated by local discharge and then convert the energy into an electric signal through an inductance coil. After the partial discharge has occurred, the discharge pulse current will propagate along the axial direction of the cable, i.e. a magnetic field will be generated in a plane perpendicular to the current propagation direction, from which the sensor is exactly coupled the discharge signal.
Fig. 1 is a schematic diagram illustrating an alternative partial discharge detection principle according to an embodiment of the present invention, as shown in fig. 1, after a partial discharge occurs in a cable, a discharge pulse is simultaneously propagated to two ends of the cable. One pulse (i.e., incident wave) is transmitted to the detection device, and the other discharge pulse is transmitted to the other end of the cable, reflected and transmitted to the detection device (i.e., reflected wave). The detection device can calculate the position of the original discharge point on the cable according to the detected time difference between the incident wave and the reflected wave and by combining the propagation speed of the discharge pulse in the cable and the length of the cable according to the following formula:
incident pulse
Reflected pulse
Time difference:
discharging position:
from the above, since the propagation speed of the cable partial discharge pulse signal in the cable is substantially fixed (in general), the existing cable partial discharge positioning technology performs positioning mainly based on the time difference (also time delay) of the discharge pulse signal generated by the cable partial discharge source reaching different sensors. The accuracy of the positioning method depends on the same discharge pulse signal acquired by a plurality of sensors, and if a plurality of discharge sources exist or the discharge sources continuously generate a plurality of discharge pulse signals, the sensors may acquire different discharge pulses, so that the positioning result is inaccurate.
Aiming at the problem that a plurality of detection devices of the existing cable partial discharge detection method work independently, and the positioning result is easy to be inaccurate under the condition that a plurality of discharge sources exist, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a method and a system for detecting partial discharge of a cable, which at least solve the technical problem that a plurality of detection devices in the existing method for detecting partial discharge of the cable work independently, and the positioning result is easy to be inaccurate under the condition that a plurality of discharge sources exist.
According to an aspect of an embodiment of the present invention, there is provided a method for detecting partial discharge of a cable, including: detecting a discharge pulse signal of the cable by a plurality of detection devices, wherein the plurality of detection devices are installed at different positions of the cable; transmitting a clock synchronization signal to the plurality of detection devices in a case where any one of the plurality of detection devices detects the discharge pulse signal; and determining the position of a discharge source on the cable according to the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signal.
According to another aspect of the embodiments of the present invention, there is also provided a system for detecting partial discharge of a cable, including: the detection equipment is arranged at different positions of the cable and used for detecting a discharge pulse signal of the cable; and the remote monitoring host is communicated with the plurality of detection devices and is used for sending clock synchronization signals to the plurality of detection devices when any one of the plurality of detection devices detects the discharge pulse signals, and determining the position of a discharge source on the cable according to the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signals.
According to another aspect of the embodiments of the present invention, there is also provided an apparatus for detecting partial discharge of a cable, including: a detection unit for detecting a discharge pulse signal of the cable by a plurality of detection devices, wherein the plurality of detection devices are installed at different positions of the cable; a first transmitting unit configured to transmit a clock synchronization signal to the plurality of detection devices in a case where any one of the plurality of detection devices detects the discharge pulse signal; and the determining unit is used for determining the position of a discharge source on the cable according to the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signal.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium including a stored program, wherein the program performs the method of cable partial discharge detection described above.
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, where the program executes the method for detecting partial discharge of a cable described above.
In the embodiment of the invention, the discharge pulse signal of the cable is detected by a plurality of detection devices, wherein the plurality of detection devices are arranged on different positions of the cable; transmitting a clock synchronization signal to the plurality of detection devices in a case where any one of the plurality of detection devices detects the discharge pulse signal; based on the clock synchronization signal, the position of the discharge source on the cable is determined according to the discharge pulse signals detected by the plurality of detection devices, and the purpose that the plurality of detection devices for detecting the partial discharge of the cable detect the discharge pulse signals based on the unified clock synchronization signal is achieved, so that the technical effect of improving the positioning precision of the partial discharge source of the cable is achieved, and the technical problem that the positioning result is inaccurate due to independent work among the plurality of detection devices in the existing cable partial discharge detection method when a plurality of discharge sources exist is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of an alternative partial discharge detection principle according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of cable partial discharge detection according to an embodiment of the present invention;
FIG. 3 is a flow diagram of an alternative method of cable partial discharge detection in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of an alternative system for online detection of partial discharge in a cable in accordance with embodiments of the present invention;
FIG. 5 is a schematic diagram of a system for partial discharge detection of a cable in accordance with an embodiment of the present invention; and
fig. 6 is a schematic diagram of an apparatus for detecting partial discharge of a cable according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with an embodiment of the present invention, there is provided a method embodiment for cable partial discharge detection, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions and that, although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that described herein.
Fig. 2 is a flowchart of a method for detecting partial discharge of a cable according to an embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:
step S202, detecting a discharge pulse signal of the cable through a plurality of detection devices, wherein the plurality of detection devices are arranged on different positions of the cable.
As an alternative embodiment, the detecting device may be a detecting device or an instrument specially used for detecting the partial discharge of the cable, or may be a device composed of a sensor and a signal collecting device, where the sensor is used for detecting the partial discharge pulse of the cable, and the signal collecting device is used for collecting the discharge pulse signal detected by the sensor.
It should be noted that, in the existing cable partial discharge positioning technology, positioning is performed mainly based on a time difference (also referred to as time delay) between a discharge pulse signal generated by a cable partial discharge source and reaching different sensors, and when there are multiple discharge sources (that is, there are different discharge pulse signals), a detection device may collect discharge pulse signals at different discharge source locations, so that a positioning result is inaccurate.
Alternatively, the cable may be a high voltage cable.
In step S204, when any one of the plurality of detection devices detects the discharge pulse signal, a clock synchronization signal is transmitted to the plurality of detection devices.
In order to distinguish the discharge pulse signals of different discharge sources, in step S204, when any one of the detection devices for detecting the partial discharge of the cable detects a discharge pulse signal, a clock synchronization signal may be transmitted to the detection devices for the detection of the same discharge pulse signal by the detection devices, so as to locate the discharge source according to the time difference of the same discharge pulse signal reaching different detection devices.
And step S206, determining the position of a discharge source on the cable according to the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signal.
Specifically, in the above steps, each detection device collects the discharge pulse signal according to the received clock synchronization signal, so that the multiple detection devices can realize high-precision time synchronization of the collection units, the synchronization precision can reach a nanosecond level, the clock height uniformity of the discharge pulse signal collected by each detection device is ensured, signal collection and signal processing are synchronously performed, and the purpose of high-precision positioning of the partial discharge source is further achieved.
It should be noted that, the existing cable partial discharge positioning technology is mainly based on the time difference (also referred to as time delay) between the discharge pulse signal generated by the cable partial discharge source and the arrival of the discharge pulse signal at different sensors to perform positioning. However, the signal acquisition device for acquiring the sensor signal is used as an electronic device, and the working principle of the signal acquisition device is that the signal is acquired in a self-triggering manner, that is, the signal is acquired only after reaching a certain amplitude, usually, the time delay is in the order of milliseconds, and this part of time delay will bring about a large positioning error (usually, the propagation speed of a pulse signal in a cable is about 265m/ms), so that the error of the signal acquisition device will also cause the positioning accuracy of a local discharge source to be low. And this application adopts time synchronization technique, through the hand-in-hand tandem type chain network who constructs the collection unit, can realize collection unit high accuracy clock synchronization. The device is based on the existing partial discharge technology, a high-precision clock synchronization technology and a partial discharge synchronization noise filtering technology are added, and the integrated online high-voltage cable partial discharge monitoring and positioning device integrating power supply, positioning, sampling and analysis is realized by means of combining a partial discharge high-frequency sensor technology, a defect type diagnosis analysis technology, a positioning technology and the like.
In addition, it should be noted that, by detecting the partial discharge of the cable by a plurality of detection devices installed at different positions, synchronous monitoring of a plurality of monitoring points can be realized, the same or similar environmental background noise can be effectively filtered, the method does not depend on a single or a few filtering models or algorithms, and meanwhile, as the high-synchronous extraction of the discharge pulse signal is realized, the position of the high-frequency partial discharge sensor is adjusted in combination, and the positioning accuracy of the discharge source is improved; since the background noise is filtered out completely, and then the discharge defect model and the fingerprint database which are established through data accumulation are more practical, the accuracy of system self-learning and intelligent judgment is improved; the system adopts a communication cable for networking, can realize the butt joint of a field and a portable platform, meet the requirement of monitoring in a short time, and also can adopt the field induction power supply and the high-bandwidth wireless mobile communication technology to realize long-time remote wireless monitoring; monitoring points which are conditional and close to the transformer substation can also be directly accessed to an in-station communication interface to realize remote platform monitoring, and meanwhile, the system also has the capability of remote feeding for monitoring equipment and solves the problem of difficulty in on-site electricity taking and power supply; the monitoring equipment comprises a few devices such as a partial discharge acquisition unit, a clock synchronization communication unit and a communication feeder cable, the deployment, the removal and the replacement of monitoring points are very convenient, and the utilization rate of the equipment is improved.
Based on the solutions disclosed in the above steps S202 to S206, after the signal acquisition unit rate near the partial discharge source first detects the partial discharge pulse signal, a synchronous acquisition unit number is immediately issued to other signal acquisition units, the other acquisition units synchronously perform signal acquisition, the time for the pulse signal generated by the partial source to reach each sensor is different, when partial discharge occurs, the pulse signal is transmitted to both sides and space via the cable, the sensors installed at different positions can acquire the waveforms of the signal, but the waveforms acquired by different sensors are different according to the difference of the transmission direction and the distance, and the location accuracy of the theoretical partial discharge fault can reach 0.2 m by combining the comprehensive analysis of parameters such as the transmission distance, the attenuation coefficient, the transmission direction, the energy intensity, and the like.
From the above, in the above embodiments of the present application, in the case that the discharge pulse signal of the cable is detected by a plurality of detection devices, if any one of the detection devices detects the discharge pulse signal, a clock synchronization signal is sent to each detection device, so that each detection device collects the discharge pulse signal according to the received clock synchronization signal, and then determines the position of the discharge source on the cable according to the discharge pulse signal detected by the plurality of detection devices based on the clock synchronization signal, thereby achieving the purpose of enabling the plurality of detection devices for detecting the partial discharge of the cable to perform the discharge pulse signal detection based on the unified clock synchronization signal, thereby achieving the technical effect of improving the positioning accuracy of the partial discharge source of the cable, and further solving the problem that the existing cable partial discharge detection method works independently among the plurality of detection devices, the technical problem of inaccurate positioning results is easily caused when a plurality of discharge sources exist.
In an alternative embodiment, as shown in fig. 3, the determining the position of the discharge source on the cable according to the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signal may include the following steps:
step S302, acquiring the time when each detection device detects a discharge pulse signal based on a clock synchronization signal;
and step S304, calculating the position of a discharge source on the cable according to the time difference of the discharge pulse signals detected by the plurality of detection devices.
Based on the foregoing embodiment, as an optional implementation manner, calculating the position of the discharge source on the cable according to the time difference when the plurality of detection devices detect the discharge pulse signals may include the following steps:
step S3041, obtaining a length of the cable;
step S3043, calculating a position of a discharge source on the cable according to the length of the cable and a time difference between the detection of the discharge pulse signal by the plurality of detection devices.
Based on any optional embodiment, as an optional implementation, when any one of the plurality of detection devices detects the discharge pulse signal, sending a clock synchronization signal to the plurality of detection devices may include: and in the case that any one of the plurality of detection devices detects the discharge pulse signal, sending a clock synchronization signal to the plurality of detection devices through the multi-channel clock synchronization routing device.
The multi-channel clock synchronization routing device can be used for simultaneously sending clock synchronization signals to a plurality of detection devices.
In order to achieve the purpose of remote online detection, as an alternative embodiment, before sending the clock synchronization signal to the multiple detection devices through the multi-channel clock synchronization routing apparatus when any one of the multiple detection devices detects the discharge pulse signal, the method may further include: the remote monitoring host monitors the running states of the plurality of detection devices, and sends clock synchronization signals to the plurality of detection devices through the multi-channel clock synchronization routing device under the condition that any one of the plurality of detection devices detects the discharge pulse signal.
As an optional embodiment, the remote monitoring host may be a server based on a cloud platform, may communicate with a portable client on site (the portable client on site communicates with the multi-channel clock synchronization routing device), or may directly communicate with the multi-channel clock synchronization routing device on site, and is configured to perform processing such as filtering, analysis, fusion, storage, early warning, and display on the sampled data, and present the result to a user in a graphical interaction interface manner, and form an evaluation report.
In an alternative embodiment, the detection device includes: fig. 4 is a schematic diagram of an alternative system for detecting partial discharge of a cable on line according to an embodiment of the present invention, as shown in fig. 4, the system includes: the system comprises a sensor 401, a signal acquisition device 403, a multi-channel clock synchronization routing device 405, a remote monitoring host 407 and a portable field terminal 409 (including but not limited to a mobile phone, a tablet computer, a notebook computer and the like).
In the specific implementation process, a sensor can be installed in each insulation joint interconnection box or grounding box of the cable, a signal acquisition device for acquiring partial discharge pulse signals is arranged near the interconnection box or the grounding box, and the discharge pulse signals detected by the sensor can be transmitted to the signal acquisition device through the coaxial cable. All the signal acquisition devices are connected end to end by optical fibers and are connected with a remote monitoring host.
Optionally, between each test point, a two-core transmission cable is laid beforehand. The cable length should be greater than the cable length and account for differences in the position of the two line splices. The optical fiber should be pre-connectorized and properly protected during the laying process.
As an optional implementation scheme, the remote monitoring host may communicate with a signal acquisition device of the detection device through a multi-channel clock synchronization routing device, wherein the process monitoring host and the multi-channel clock synchronization routing device form a network high-precision time service and communication architecture, so as to provide nanosecond-level clock synchronization time service for the synchronous partial discharge measurement and positioning device, the point-to-point time service precision of the system is less than or equal to 2 nanoseconds, the time service distance is greater than or equal to 2 kilometers through a hand-in-hand cascaded type network, and the number of time service nodes is greater than or equal to 20.
In an alternative embodiment, a variable bandwidth high-speed differential full-duplex communication mode is adopted between the remote monitoring host and the multi-channel clock synchronous routing device. Based on high-speed full-duplex RS485 communication, the communication rate is up to 16Mbps, and a double-backup tunneling redundant network is formed by 4 pairs of communication line pairs. At least 5Mbps of transmission rate can be supported at a communication distance of 100m between the multi-channel clock synchronous routing devices. Combining FDD/TDD, i.e. frequency division duplex and time division duplex technology, the uplink and downlink bandwidth is changed according to asymmetric uplink and downlink data volume. The data transmission mode of the wired looped network backup can realize fault crossing and link backup of the communication link and increase the reliability of data transmission of the communication link.
Optionally, the multi-channel clock synchronous routing device will employ a low voltage 3In a 6V remote centralized power supply mode, the required working power supplies are all provided with a double-hot backup power supply unit in a transformer substation through a double-backup tunneling type redundant network remote power supply transmission bus of 0.5mm2The twisted pair wires are supplied in a remote centralized manner, and the effective signal transmission and the remote centralized power supply distance are within 10 kilometers of the central radius of the double-hot backup power supply unit. The multi-channel clock synchronous routing device provides 1 path of DC36V2.4W safe direct-current voltage remote feed circuit adopting a parallel topology mode to the outside, and supplies power for a synchronous partial discharge measurement positioning device, a high-frequency partial discharge mutual inductor and a current sampling mutual inductor.
According to the scheme disclosed by the embodiment of the application, the accurate synchronization of the clocks of the plurality of monitoring terminals (detection equipment) is realized by applying a multichannel nanosecond clock synchronization technology, line interference and environmental noise are effectively filtered by a plurality of monitoring terminal analog algorithms, and the positioning precision of the cable fault point is greatly improved. The system is convenient for timely finding the hidden trouble of cable fault for real-time monitoring and early warning, and avoids hidden trouble caused by incapability of timely repairing. The adverse effects on the environment and the life of residents caused by the operation faults of the power grid are reduced, the times and time of unplanned power failure are reduced, and the loss of the power system faults to the society is reduced.
According to an embodiment of the present invention, there is also provided a system embodiment for implementing the method for detecting partial discharge of a cable, and fig. 5 is a schematic diagram of a system for detecting partial discharge of a cable according to an embodiment of the present invention, as shown in fig. 5, the system includes: a plurality of detection devices 501 and a remote monitoring host 503.
The detection devices 501 are deployed at different positions of the cable and are used for detecting discharge pulse signals of the cable;
and the remote monitoring host 503 is in communication with the plurality of detection devices, and is configured to send clock synchronization signals to the plurality of detection devices when any one of the plurality of detection devices detects the discharge pulse signal, and determine the position of the discharge source on the cable according to the discharge pulse signal detected by the plurality of detection devices based on the clock synchronization signals.
As can be seen from the above, in the above embodiment of the present application, the plurality of detection devices 501 detect the discharge pulse signal of the cable, and the remote monitoring host 503 sends the clock synchronization signal to each detection device 501 when monitoring that any one of the plurality of detection devices detects the discharge pulse signal, so that each detection device 501 collects the discharge pulse signal according to the received clock synchronization signal, and then determines the position of the discharge source on the cable according to the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signal, thereby achieving the purpose of enabling the plurality of detection devices for detecting the partial discharge of the cable to detect the discharge pulse signal based on the unified clock synchronization signal, thereby achieving the technical effect of improving the positioning accuracy of the partial discharge source of the cable, and further solving the problem that the existing cable partial discharge detection method works independently among the plurality of detection devices, the technical problem of inaccurate positioning results is easily caused when a plurality of discharge sources exist.
In an alternative embodiment, the detection device includes: a sensor for detecting a discharge pulse signal of the cable; and the signal acquisition device is connected with the sensor through a coaxial cable and is used for acquiring the discharge pulse signal transmitted by the sensor.
In an alternative embodiment, the signal collecting devices of the plurality of detection devices communicate with each other through optical fibers.
In an optional embodiment, the system further includes: and the multi-channel clock synchronization routing device is communicated with the signal acquisition device of each detection device, and the remote monitoring host sends clock synchronization signals to the plurality of detection devices through the multi-channel clock synchronization routing device.
In an alternative embodiment, the remote monitoring host and the multi-channel clock synchronous routing device adopt a full-duplex communication mode of differential transmission.
According to an embodiment of the present invention, there is also provided an apparatus embodiment for implementing the method for detecting partial discharge of a cable, fig. 6 is a schematic diagram of an apparatus for detecting partial discharge of a cable according to an embodiment of the present invention, and as shown in fig. 6, the apparatus includes: a detection unit 601, a first transmission unit 603 and a determination unit 605.
The detection unit 601 is configured to detect a discharge pulse signal of the cable through a plurality of detection devices, where the plurality of detection devices are installed at different positions of the cable;
a first transmitting unit 603 configured to transmit a clock synchronization signal to the plurality of detection devices in a case where any one of the plurality of detection devices detects the discharge pulse signal;
a determining unit 605 for determining a position of a discharge source on the cable based on the discharge pulse signals detected by the plurality of detecting devices based on the clock synchronization signal.
It should be noted here that the above-mentioned detecting unit 601, first sending unit 603, and determining unit 605 correspond to steps S202 to S206 in the method embodiment, and the above-mentioned modules are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above-mentioned method embodiment. It should be noted that the modules described above as part of an apparatus may be implemented in a computer system such as a set of computer-executable instructions.
From the above, in the above embodiments of the present application, in the case that the discharge pulse signal of the cable is detected by a plurality of detection devices, if any one of the detection devices detects the discharge pulse signal, a clock synchronization signal is sent to each detection device, so that each detection device collects the discharge pulse signal according to the received clock synchronization signal, and then determines the position of the discharge source on the cable according to the discharge pulse signal detected by the plurality of detection devices based on the clock synchronization signal, thereby achieving the purpose of enabling the plurality of detection devices for detecting the partial discharge of the cable to perform the discharge pulse signal detection based on the unified clock synchronization signal, thereby achieving the technical effect of improving the positioning accuracy of the partial discharge source of the cable, and further solving the problem that the existing cable partial discharge detection method works independently among the plurality of detection devices, the technical problem of inaccurate positioning results is easily caused when a plurality of discharge sources exist.
In an alternative embodiment, the determining unit includes: the acquisition module is used for acquiring the time when each detection device detects the discharge pulse signal based on the clock synchronization signal; and the calculating module is used for calculating the position of a discharge source on the cable according to the time difference of the discharge pulse signals detected by the plurality of detection devices.
In an alternative embodiment, the computing module includes: the obtaining submodule is used for obtaining the length of the cable; and the calculating submodule is used for calculating the position of a discharge source on the cable according to the length of the cable and the time difference of the discharge pulse signals detected by the plurality of detection devices.
In an optional embodiment, the first sending unit is further configured to send a clock synchronization signal to the plurality of detection devices through the multi-channel clock synchronization routing apparatus when any one of the plurality of detection devices detects the discharge pulse signal.
In an optional embodiment, the apparatus further comprises: and the second sending unit is used for monitoring the running states of the plurality of detection devices by the remote monitoring host and sending the clock synchronization signals to the plurality of detection devices through the multi-channel clock synchronization routing device under the condition that any one of the plurality of detection devices detects the discharge pulse signals.
According to an embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program performs any one of the optional or preferred methods of cable partial discharge detection in the above method embodiments.
There is further provided, according to an embodiment of the present invention, a processor, configured to execute a program, where the program executes a method for detecting partial discharge of a cable, which is optional or preferable in any of the above method embodiments.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A method of cable partial discharge detection, comprising:
detecting a discharge pulse signal of a cable by a plurality of detection devices, wherein the plurality of detection devices are installed at different positions of the cable;
transmitting a clock synchronization signal to the plurality of detection devices in a case where any one of the plurality of detection devices detects a discharge pulse signal;
determining the position of a discharge source on the cable according to the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signal;
wherein, in a case where any one of the plurality of detection devices detects a discharge pulse signal, transmitting a clock synchronization signal to the plurality of detection devices includes: under the condition that any one of the plurality of detection devices detects a discharge pulse signal, sending a clock synchronization signal to the plurality of detection devices through a multi-channel clock synchronization routing device;
in a case where any one of the plurality of detection devices detects a discharge pulse signal, before the clock synchronization signal is sent to the plurality of detection devices by a multichannel clock synchronization routing apparatus, the method further includes: and the remote monitoring host monitors the running states of the plurality of detection devices and sends clock synchronization signals to the plurality of detection devices through the multichannel clock synchronization routing device under the condition that any one of the plurality of detection devices detects a discharge pulse signal.
2. The method of claim 1, wherein determining the location of the discharge source on the cable from the discharge pulse signals detected by the plurality of detection devices based on the clock synchronization signal comprises:
acquiring the time when each detection device detects the discharge pulse signal based on the clock synchronization signal;
and calculating the position of a discharge source on the cable according to the time difference of the discharge pulse signals detected by the plurality of detection devices.
3. The method of claim 2, wherein calculating the location of the discharge source on the cable based on the time difference between the detection of the discharge pulse signal by the plurality of detection devices comprises:
acquiring the length of the cable;
and calculating the position of a discharge source on the cable according to the length of the cable and the time difference of the discharge pulse signals detected by the plurality of detection devices.
4. A system for cable partial discharge detection, comprising:
the detection equipment is arranged at different positions of the cable and used for detecting a discharge pulse signal of the cable;
the remote monitoring host is communicated with the plurality of detection devices and is used for sending clock synchronization signals to the plurality of detection devices when any detection device in the plurality of detection devices detects a discharge pulse signal, and determining the position of a discharge source on the cable according to the discharge pulse signal detected by the plurality of detection devices based on the clock synchronization signals;
the remote monitoring host sends a clock synchronization signal to the plurality of detection devices through the multi-channel clock synchronization routing device;
the remote monitoring host and the multichannel clock synchronous routing device adopt a full-duplex communication mode of differential transmission.
5. The system of claim 4, wherein the detection device comprises:
a sensor for detecting a discharge pulse signal of the cable;
and the signal acquisition device is connected with the sensor through a coaxial cable and is used for acquiring the discharge pulse signal transmitted by the sensor.
6. The system of claim 5, wherein the signal acquisition devices of the plurality of detection apparatuses communicate with each other through optical fibers.
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| CN110888091B (en) * | 2018-09-06 | 2022-09-23 | 西门子（中国）有限公司 | Device for monitoring the discharge of a transformer |
| CN110933365A (en) * | 2019-11-04 | 2020-03-27 | 山东康威通信技术股份有限公司 | Two-dimensional holder device and method for realizing dynamic video monitoring based on window |
| CN111551831A (en) * | 2020-06-01 | 2020-08-18 | 广西电网有限责任公司南宁供电局 | Model machine platform for monitoring partial discharge of distribution cable |
| CN112180218B (en) * | 2020-09-30 | 2024-10-29 | 北京神州泰岳软件股份有限公司 | Partial discharge monitoring method, system and device |
| CN113219310B (en) * | 2021-04-23 | 2023-05-02 | 深圳供电局有限公司 | Partial discharge positioning method, device, positioning equipment and storage medium |
| CN113608078B (en) * | 2021-06-29 | 2023-12-29 | 深圳供电局有限公司 | Partial discharge test system |
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