CN108614198B - High-voltage cable voltage-withstand test distributed partial discharge detection system and detection method thereof - Google Patents
High-voltage cable voltage-withstand test distributed partial discharge detection system and detection method thereof Download PDFInfo
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- CN108614198B CN108614198B CN201810360168.1A CN201810360168A CN108614198B CN 108614198 B CN108614198 B CN 108614198B CN 201810360168 A CN201810360168 A CN 201810360168A CN 108614198 B CN108614198 B CN 108614198B
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- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention relates to a distributed partial discharge detection system for a high-voltage cable withstand voltage test, which comprises a partial discharge sensor, a partial discharge recorder, an intelligent terminal and a background server which are connected in sequence; the partial discharge sensor is arranged on a three-phase cable of the high-voltage cable and used for collecting sheath grounding current and partial discharge signals of a withstand voltage test of the three-phase cable; the partial discharge recorder is used for comparing sheath grounding current of the three-phase cable acquired by the partial discharge sensor with a set threshold value, and if the sheath grounding current is greater than the threshold value, measuring a partial discharge signal of the three-phase cable through the partial discharge sensor and storing the partial discharge signal locally; the intelligent terminal is used for deriving a partial discharge signal from the partial discharge recorder, transmitting the partial discharge signal to the background server in a wireless communication mode, determining the partial discharge state of the three-phase cable according to the partial discharge signal, and measuring the partial discharge signal of the high-voltage cable voltage withstand test, so that the measurement data volume is compressed, and the detection efficiency is improved.
Description
Technical Field
The invention relates to the technical field of high-voltage cables, in particular to a distributed partial discharge detection system and a distributed partial discharge detection method for a high-voltage cable withstand voltage test.
Background
With the rapid development of power grids and power utilization utilities, the operation and maintenance of high-voltage cables are increasingly emphasized by power systems, and the state detection of the high-voltage cables is gradually a research hotspot. The high-voltage cable carries out distributed partial discharge detection while carrying out a handover voltage withstand test, and is an effective test method for judging the construction quality and the insulation quality of a cable system at present.
The distributed partial discharge measurement method adopted at present mainly utilizes a mode of optical fiber communication or GPRS communication to feed back power data of a high-voltage cable acquired on site to a background analysis system for partial discharge detection, however, the mode often causes low partial discharge detection efficiency of the high-voltage cable due to large amount of acquired data; moreover, because the high-voltage cable is laid in various ways, such as direct-buried laying, cable trench laying, tunnel laying, overhead laying, underwater laying and the like, the implementation difficulty is high for the overhead laying or underwater laying cable, and the GPRS communication mode has high requirements on the quality of communication signals at cable joints and is difficult to implement for the tunnel laying or cables far away from a base station.
Disclosure of Invention
Therefore, it is necessary to provide a distributed partial discharge detection system for a high-voltage cable withstand voltage test and a distributed partial discharge detection method for a high-voltage cable withstand voltage test, aiming at the problem that the detection efficiency of the conventional technology is relatively low.
A distributed partial discharge detection system for a high-voltage cable withstand voltage test comprises: the system comprises a partial discharge sensor, a partial discharge recorder, an intelligent terminal and a background server which are connected in sequence; wherein the content of the first and second substances,
the partial discharge sensor is arranged on a three-phase cable of the high-voltage cable and is used for collecting sheath grounding current and partial discharge signals of the three-phase cable of the high-voltage cable during a voltage withstand test;
the partial discharge recorder is used for comparing sheath grounding current of the three-phase cable acquired by the partial discharge sensor with a set threshold value, and if the sheath grounding current of the three-phase cable is greater than the set threshold value, measuring a partial discharge signal of the three-phase cable through the partial discharge sensor and locally storing the partial discharge signal;
the intelligent terminal is used for deriving the partial discharge signal from the partial discharge recorder, communicating with the background server in a wireless communication mode and transmitting the partial discharge signal to the background server;
the background server is used for determining the partial discharge state of the three-phase cable of the high-voltage cable during the voltage withstand test according to the partial discharge signal.
The distributed partial discharge detection system for the high-voltage cable voltage-withstand test comprises a partial discharge sensor, a partial discharge recorder, an intelligent terminal and a background server which are connected in sequence, wherein the partial discharge sensor is arranged on a three-phase cable of the high-voltage cable and used for collecting sheath grounding current and partial discharge signals of the three-phase cable during the voltage-withstand test, the partial discharge recorder compares the sheath grounding current collected by the partial discharge sensor with a set threshold value, if the sheath grounding current is greater than the threshold value, the partial discharge signals of the three-phase cable are measured through the partial discharge sensor and stored locally, the intelligent terminal derives the partial discharge signals from the partial discharge recorder and transmits the partial discharge signals to the background server in a wireless communication mode, and the background server determines the partial discharge state of the three-phase cable according to the partial discharge signals, so that the partial discharge signals during the voltage-withstand test of the high-, the sheath grounding current is judged by utilizing the set threshold, the data volume of the measured partial discharge signal is reduced, and the working efficiency of detecting the partial discharge of the high-voltage cable is improved.
In one embodiment, the background server is further configured to determine a partial discharge type and a discharge defect position of a three-phase cable of the high-voltage cable according to a partial discharge signal of the three-phase cable;
and obtaining the partial discharge state of the three-phase cable of the high-voltage cable during the voltage withstand test according to the partial discharge type and the discharge defect position.
In one embodiment, the background server is further configured to compare partial discharge signals of three-phase cables of the high-voltage cable on the same time scale, and determine the partial discharge type;
determining the position of the discharge defect according to the amplitude of the partial discharge signal of the adjacent measuring point of the three-phase cable of the high-voltage cable; the measuring point is a position on the high-voltage cable for measuring a partial discharge signal of the three-phase cable.
In one embodiment, the partial discharge sensor comprises a plurality of high-frequency partial discharge sensors respectively arranged on the sheath grounding wires of the cable joints of the three-phase cable, and is used for acquiring sheath grounding currents on the sheath grounding wires of the cable joints of the three-phase cable and partial discharge signals of the three-phase cable.
In one embodiment, the partial discharge recorder is a multichannel partial discharge recorder; and each input channel of the multichannel partial discharge recorder is respectively connected with each high-frequency partial discharge sensor.
In one embodiment, each signal input port of the multichannel partial discharge recorder is connected with each high-frequency partial discharge sensor through a high-frequency coaxial cable.
In one embodiment, the background server is further configured to perform unified time synchronization on a plurality of multi-channel partial discharge recorders connected to the high-frequency partial discharge sensor.
In one embodiment, the partial discharge recorder is further configured to measure a partial discharge signal of a three-phase cable of the high-voltage cable through a partial discharge sensor of the three-phase cable when a sheath grounding current of any one phase of the three-phase cable exceeds the set threshold.
In one embodiment, the intelligent terminal is in communication connection with the partial discharge recorder through a USB interface, and is configured to derive the partial discharge signal from the partial discharge recorder through the USB interface.
In an embodiment, there is provided a distributed partial discharge detection method for a high-voltage cable withstand voltage test of a distributed partial discharge detection system based on the high-voltage cable withstand voltage test described in any one of the above embodiments, including the following steps:
mounting the partial discharge sensor on a sheath ground wire at each cable joint of a three-phase cable of a high-voltage cable;
connecting the partial discharge sensor to a partial discharge recorder by using a high-frequency coaxial cable;
when the high-voltage cable is subjected to a voltage withstand test, the sheath grounding current and the local discharge signal of the three-phase cable of the high-voltage cable are collected through the local discharge sensor;
comparing sheath grounding current of the three-phase cable acquired by the partial discharge sensor with a set threshold value by using the partial discharge recorder, and if the sheath grounding current of the three-phase cable is greater than the set threshold value, measuring a partial discharge signal of the three-phase cable by using the partial discharge sensor and locally storing the partial discharge signal by using the partial discharge recorder;
deriving the partial discharge signal from the partial discharge recorder through an intelligent terminal, and sending the partial discharge signal to the background server in a wireless communication mode;
and acquiring the partial discharge state of the three-phase cable of the high-voltage cable during the voltage withstand test through the background server.
According to the partial discharge detection method for the high-voltage cable withstand voltage test, the distributed partial discharge detection system for the high-voltage cable withstand voltage test is used for detecting the partial discharge condition of the three-phase cable of the high-voltage cable, so that the partial discharge signal during the high-voltage cable withstand voltage test is measured by using the partial discharge sensor, the sheath grounding current is judged by using the set threshold value through the partial discharge recorder, the data volume for measuring the partial discharge signal is reduced, and the work efficiency for detecting the partial discharge of the high-voltage cable is improved.
Drawings
FIG. 1 is a schematic structural diagram of a distributed partial discharge detection system for a high-voltage cable withstand voltage test in one embodiment;
fig. 2 is a flowchart of a distributed partial discharge detection method for a high-voltage cable withstand voltage test in one embodiment.
Detailed Description
The following describes in detail a specific embodiment of the distributed partial discharge detection system for the high-voltage cable withstand voltage test according to the present invention with reference to the accompanying drawings.
In an embodiment, a distributed partial discharge detection system for a high voltage cable withstand voltage test is provided, referring to fig. 1, fig. 1 is a schematic structural diagram of a distributed partial discharge detection system for a high voltage cable withstand voltage test in an embodiment, where the distributed partial discharge detection system for a high voltage cable withstand voltage test may include: the system comprises a partial discharge sensor 300, a partial discharge recorder 400, an intelligent terminal 500 and a background server 600 which are connected in sequence; wherein the content of the first and second substances,
the partial discharge sensor 300 is arranged on the three-phase cable 100 of the high-voltage cable and is used for collecting sheath grounding current and partial discharge signals of the three-phase cable 100 of the high-voltage cable during a voltage withstand test;
the partial discharge recorder 400 is configured to compare the sheath ground current of the three-phase cable 100 collected by the partial discharge sensor 300 with a set threshold, and if the sheath ground current of the three-phase cable is greater than the set threshold, measure a partial discharge signal of the three-phase cable 100 through the partial discharge sensor 300, and locally store the partial discharge signal;
the intelligent terminal 500 is configured to derive a partial discharge signal from the partial discharge recorder 400, communicate with the background server 600 in a wireless communication manner, and transmit the partial discharge signal to the background server 600;
the background server 600 is configured to determine a partial discharge state of the high-voltage cable when the voltage withstand test is performed on the three-phase cable 100 according to the partial discharge signal.
In this embodiment, the three-phase cable 100 may include an a-phase cable 100a, a B-phase cable 100B, and a C-phase cable 100C, and a plurality of sets of cable joints 200 may be respectively arranged on each phase cable, including cable joints such as a cable joint No. 1 201, a cable joint No. 2 202, a cable joint No. 3, a cable joint No. 4 204, and a cable joint No. 5 205.
The number of the partial discharge sensors 300 may be multiple, and the partial discharge sensors 300 may be respectively disposed on the sheath ground wire at each cable joint of the three-phase cable 100 and near the cable joint, the partial discharge sensors 300 may be configured to collect electrical signals generated by the high-voltage cable 100 during the withstand voltage test, including sheath ground current signals, partial discharge signals, background noise signals, and other electrical signals of the three-phase cable, and each partial discharge sensor 300 may be respectively connected to a signal input channel of the local discharge recorder 400 nearby, so as to transmit the collected electrical signals to the local discharge recorder 400.
The number of the partial discharge recorders 400 may be multiple, a plurality of signal input channels are provided on the partial discharge recorders 400, the partial discharge recorders 400 may receive the electrical signals collected by the partial discharge sensors 300 through the signal input channels, respectively, and are used to compare the sheath ground current of the three-phase cable 100 collected by the partial discharge sensors 300 with a set threshold, and if the sheath ground current of the three-phase cable 100 is greater than the set threshold, the partial discharge recorders 300 measure the partial discharge signals of the three-phase cable 100 and locally store the partial discharge signals.
The intelligent terminal 500 may be a mobile phone, and may be in communication connection with the partial discharge recorder 400 through a communication interface, so as to derive a locally stored partial discharge signal measured by the partial discharge sensor 300 from the partial discharge recorder 400, and perform communication connection with the background server 600 of the background analysis system in a wireless communication manner, and transmit data of the partial discharge signal to the background server 600.
The background server 600 may be implemented by a computer, an independent server, or a server cluster composed of a plurality of servers, and the background server 600 may be configured to determine a partial discharge state of the three-phase cable 100 of the high-voltage cable when performing a withstand voltage test according to data of a partial discharge signal sent by the intelligent terminal 500.
The distributed partial discharge detection system for the high-voltage cable voltage-withstand test comprises a partial discharge sensor, a partial discharge recorder, an intelligent terminal and a background server which are connected in sequence, wherein the partial discharge sensor is arranged on a three-phase cable of the high-voltage cable and used for collecting sheath grounding current and partial discharge signals of the three-phase cable during the voltage-withstand test, the partial discharge recorder compares the sheath grounding current collected by the partial discharge sensor with a set threshold value, if the sheath grounding current is greater than the threshold value, the partial discharge signals of the three-phase cable are measured through the partial discharge sensor and stored locally, the intelligent terminal derives the partial discharge signals from the partial discharge recorder and transmits the partial discharge signals to the background server in a wireless communication mode, and the background server determines the partial discharge state of the three-phase cable according to the partial discharge signals, so that the partial discharge signals during the voltage-withstand test of the high-, the sheath grounding current is judged by utilizing the set threshold, the data volume of the measured partial discharge signal is reduced, and the working efficiency of detecting the partial discharge of the high-voltage cable is improved.
In one embodiment, the partial discharge sensor may include a plurality of high-frequency partial discharge sensors respectively disposed on the sheath ground of the cable joint of the three-phase cable for collecting a sheath ground current on the sheath ground of the cable joint of the three-phase cable and a partial discharge signal of the three-phase cable.
In this embodiment, the partial discharge sensor 300 may include a plurality of high frequency partial discharge sensors, each of the high frequency partial discharge sensors may be respectively disposed on the sheath ground wire of the cable joint 100 of the three-phase cable, when the high voltage cable is subjected to a voltage withstand test, the sheath ground current and the partial discharge signal of the three-phase cable 100 may be measured by the high frequency partial discharge sensors, and each of the high frequency partial discharge sensors may be respectively disposed on the sheath ground wires of the cable joints of A, B and the C three-phase cable, so as to obtain the sheath ground current at each cable joint of the three-phase cable 100, thereby facilitating to improve the accuracy of measuring the sheath ground current data of the three-phase cable, and also facilitating to improve the accuracy of detecting the partial discharge condition of the three-phase cable.
In one embodiment, the partial discharge recorder 400 is a multi-channel partial discharge recorder, wherein each input channel of the multi-channel partial discharge recorder is connected to each of the high frequency partial discharge sensors.
In this embodiment, the partial discharge recorder 400 comprises a multi-channel partial discharge recorder, such as a four-channel partial discharge recorder, the multi-channel partial discharge recorder can be used for measuring and recording signals of various high-frequency partial discharge sensors, the multi-channel partial discharge recorder may comprise a plurality of signal input channels, each input channel may be connected to each high frequency partial discharge sensor provided on the three-phase cable via a coaxial cable, for example, the high-frequency partial discharge sensors can be respectively connected to the signal input channels of the multichannel partial discharge recorder through the high-frequency coaxial cables, the multichannel partial discharge recorder is adopted to collect electric signals measured by the high-frequency partial discharge sensors, the accuracy of measuring sheath grounding current data of the three-phase cable is further improved, and the accuracy of detecting the partial discharge condition of the three-phase cable is further improved.
In one embodiment, the background server 600 is further configured to perform unified time synchronization on a plurality of multi-channel partial discharge recorders connected to the high-frequency partial discharge sensor.
In the present embodiment, it is mainly considered that since the number of cable joints of the three-phase cable is large, and the number of partial discharge sensors disposed at the three-phase cable joints is also correspondingly large, each partial discharge sensor can be connected by a plurality of multi-channel partial discharge recorders, for example, the high-frequency partial discharge sensors of the plurality of three-phase cables are connected to nearby multi-channel partial discharge recorders, and the high-frequency partial discharge sensors can be effectively connected in groups by providing the plurality of multi-channel partial discharge recorders.
Before the high-voltage cable voltage withstand test starts, the background server 600 is used for carrying out unified time calibration on each multi-channel partial discharge recorder connected with the high-frequency partial discharge sensors of different groups, so that the uniformity of data collected by each multi-channel partial discharge recorder is guaranteed, the accuracy of measuring partial discharge signal data is improved, and the accuracy of detecting the partial discharge state of the high-voltage cable is also improved.
In one embodiment, the partial discharge recorder 400 is further configured to measure a partial discharge signal of the three-phase cable of the high voltage cable by the partial discharge sensor of the three-phase cable when the sheath ground current of any one of the three-phase cables exceeds a set threshold.
When the grounding current of the sheath of any phase of the three-phase cable exceeds a set threshold value, the partial discharge signal of the three-phase cable of the high-voltage cable is measured through the partial discharge sensor of the three-phase cable.
In this embodiment, when the sheath ground current of any one of the three-phase cables acquired by the partial discharge recorder 400 is greater than the set threshold, the partial discharge recorder 400 measures the partial discharge signals of A, B, C of the three-phase cables through the partial discharge sensors 300 provided on the three-phase cables, that is, the partial discharge recorder 400 measures the partial discharge signals of the three-phase cables through the partial discharge sensors provided on the cables of each phase.
The partial discharge recorder 400, such as a multi-channel discharge recorder, may be started to measure the sheath ground current of the three-phase cable in real time through the partial discharge sensor 300, when the measured value of the sheath ground current of any one phase of the cable exceeds a set threshold, the partial discharge recorder 400 automatically starts a built-in partial discharge measurement module, and the partial discharge measurement module is used to measure and record the electrical signals, such as the partial discharge signal, the background noise signal, and the sheath ground current signal, measured by the partial discharge sensor 300, and if it is detected that none of the measured values of the sheath ground current of the three-phase cable exceeds the set threshold, the partial discharge recorder 400 controls the partial discharge measurement module to enter a standby state.
By adopting the technical scheme of the embodiment, the grounding sheath current of any phase cable of the high-voltage cable is detected, and when the grounding sheath current of any phase cable exceeds the threshold value, the partial discharge signal of each phase cable is measured, so that in the process of carrying out the voltage withstand test on the high-voltage cable, when the phase change pressurization is carried out after the voltage withstand test of the single-phase cable is completed, the working state of the built-in partial discharge measurement module is switched by the multi-channel partial discharge recorder, the accuracy of measuring the partial discharge signal data is ensured, and the working energy consumption of the partial discharge recorder in measuring the partial discharge signal is reduced.
In one embodiment, the smart terminal 500 is communicatively connected to the partial discharge recorder 400 via a USB interface for deriving the partial discharge signal from the partial discharge recorder via the USB interface.
In this embodiment, the USB interface of the intelligent terminal 500, such as a mobile phone, is mainly used to perform communication connection with the partial discharge recorder 400, and the data stored in the partial discharge recorder is imported into the intelligent terminal 500 through the USB interface.
By adopting the technical scheme of the embodiment, a tester can retrieve the data stored by the partial discharge recorder 400 through the portable intelligent terminal 500, take the mobile phone to a good network place and send the data to the background server 600, and the transmission reliability of data such as partial discharge signals of the three-phase cable of the high-voltage cable is improved.
In one embodiment, the backend server 600 is further configured to determine a partial discharge type and a discharge defect position of the three-phase cable according to a partial discharge signal of the three-phase cable of the high-voltage cable; and obtaining the partial discharge state of the three-phase cable of the high-voltage cable during the voltage withstand test according to the partial discharge type and the discharge defect position.
In this embodiment, after acquiring data of a partial discharge signal of a three-phase cable, the background analysis system 600 may import the data into a database, find out a measurement point where the signal in the partial discharge signal exceeds the standard through threshold diagnosis, determine whether the signal has power frequency correlation, and may exclude whether the acquired partial discharge signal is an effective partial discharge signal, if the acquired partial discharge signal is an effective partial discharge signal, compare the partial discharge signals on the same time scale to determine the partial discharge type of the three-phase cable of the high-voltage cable, for example, compare and analyze partial discharge signals collected by different channels of the same partial discharge recorder on the same time scale, and may exclude external discharge interference, and if discharge signals appear in each channel at the same time, determine that the signal is external interference, because only one phase is pressurized, if only one channel continuously generates a discharge signal, the discharge signal is judged to be a suspected defect discharge signal; the distance of the partial discharge recorder of a discharge defect can be determined by comparing and analyzing the amplitude of the partial discharge signal of adjacent measuring points on the three-phase cable of the high-voltage cable, wherein the measuring points refer to the position points on the high-voltage cable for measuring the partial discharge signal of the three-phase cable, such as the position points where the partial discharge sensors are installed.
The background analysis system 600 can determine the partial discharge state of the three-phase cable of the high-voltage cable during the voltage withstand test according to the determined partial discharge type and the position point of the partial discharge defect.
By adopting the technical scheme of the embodiment, the background analysis system 600 detects the partial discharge state of the high-voltage cable during the voltage withstand test by using the partial discharge type and the discharge defect position of the high-voltage cable, so that the accuracy and the working efficiency of detecting the partial discharge state of the three-phase cable of the high-voltage cable are improved.
In an embodiment, based on the distributed partial discharge detection system for the high-voltage cable withstand voltage test as described in any of the above embodiments, a distributed partial discharge detection method for the high-voltage cable withstand voltage test is provided, and the method may include the following steps:
mounting the partial discharge sensor 300 on the sheath ground wire at each cable joint of the three-phase cable 100 of the high-voltage cable;
the partial discharge sensor 300 is connected to the partial discharge recorder 400 by a high-frequency coaxial cable;
when the high-voltage cable is subjected to a withstand voltage test, the sheath grounding current and the local discharge signal of the three-phase cable 100 of the high-voltage cable are collected through the local discharge sensor 300;
comparing sheath grounding current of the three-phase cable 100 acquired by the partial discharge sensor 300 with a set threshold value by using the partial discharge recorder 400, if the sheath grounding current of the three-phase cable 100 is greater than the set threshold value, measuring a partial discharge signal of the three-phase cable by using the partial discharge sensor 300, and locally storing the partial discharge signal by using the partial discharge recorder 400;
deriving a partial discharge signal from the partial discharge recorder 400 through the intelligent terminal 500, and sending the partial discharge signal to the background server 600 in a wireless communication mode;
the partial discharge state of the three-phase cable 100 of the high-voltage cable during the voltage withstand test is obtained through the background server 600.
In the present embodiment, a plurality of high-frequency discharge sensors may be installed on the sheath ground at each cable joint of the three-phase cable 100 of the high-voltage cable and in the vicinity of the cable joint; each high-frequency partial discharge sensor is connected to a nearby multichannel partial discharge recorder such as a four-channel partial discharge recorder through a high-frequency coaxial cable, when a withstand voltage test of the high-voltage cable is started, sheath grounding current and a local discharge signal of a three-phase cable 100 of the high-voltage cable can be collected through the partial discharge sensor 300, the sheath grounding current is compared with a set threshold value by using the partial discharge recorder 400, if the sheath grounding current of any phase cable is greater than the set threshold value, a partial discharge signal of the three-phase cable 100 can be measured through the partial discharge sensor 300 and is locally stored, the partial discharge signal is derived from the partial discharge recorder 400 through a USB interface by using an intelligent terminal 500 such as a mobile phone, and the partial discharge signal can be sent to a background server 600 through a wireless communication mode in a place where a network signal of the intelligent terminal 500 is good, the background server 600 acquires the partial discharge state of the high-voltage cable 100 during the voltage withstand test, so as to detect the partial discharge state of the high-voltage cable 100 during the voltage withstand test.
According to the partial discharge detection method for the high-voltage cable withstand voltage test, the distributed partial discharge detection system for the high-voltage cable withstand voltage test is used for detecting the partial discharge condition of the three-phase cable of the high-voltage cable, so that the partial discharge signal during the high-voltage cable withstand voltage test is measured by using the partial discharge sensor, the sheath grounding current is judged by using the set threshold value through the partial discharge recorder, the data volume for measuring the partial discharge signal is reduced, and the work efficiency for detecting the partial discharge of the high-voltage cable is improved.
In order to more clearly illustrate the technical solution of the present invention, in an embodiment, a partial discharge detection method for a high voltage cable withstand voltage test of a distributed partial discharge detection system based on the high voltage cable withstand voltage test according to any of the above embodiments is provided, referring to fig. 2, where fig. 2 is a flowchart of the distributed partial discharge detection method for the high voltage cable withstand voltage test according to an embodiment, and the distributed partial discharge detection method for the high voltage cable withstand voltage test may include the following steps:
and step s1, carrying out time synchronization on the four-channel partial discharge recorder through the background analysis system.
The four-channel partial discharge recorder can be integrated together, the network cable is connected with a background server of a background analysis system, and the background analysis system is used for uniformly timing all the four-channel partial discharge recorders.
And step s2, installing a high-frequency partial discharge sensor and a four-channel partial discharge recorder.
Before the cable withstand voltage test is started, a high-frequency partial discharge sensor is respectively arranged on an A, B, C three-phase cable sheath grounding wire at each cable joint and near the cable joint, and four high-frequency partial discharge sensors are respectively connected to a nearby four-channel partial discharge recorder by using high-frequency coaxial cables.
And step s3, starting a cable alternating current withstand voltage test.
An ac withstand voltage test for a three-phase cable of a high voltage cable is started.
Step s4, the four-channel partial discharge recorder real-time measures sheath grounding current signal, and makes intelligent threshold judgment (all sheath grounding currents are lower than threshold, any sheath grounding current exceeds threshold)
In this step, the four-channel partial discharge recorder is started, the sheath grounding current of the three-phase cable is measured in real time by the partial discharge sensor, when the measured value of the sheath grounding current of any phase of the cable exceeds a set value, the step s6 is executed, otherwise, the step s5 is executed.
At step s5, the partial discharge measurement module is on standby.
In the step, the partial discharge measurement module enters a standby state under the condition that the sheath grounding current of all the phase cables is lower than a threshold value.
And step s6, automatically starting the local discharge measurement module, and measuring and recording the local discharge signal, the background noise signal and the sheath grounding current signal.
The method comprises the following steps that under the condition that the sheath grounding current of any phase of cable exceeds a threshold value, a local discharge measurement module of a local discharge recorder is automatically started, and a local discharge signal, a background noise signal and a sheath grounding current signal are measured and recorded.
And step s7, whether the cable alternating current withstand voltage test is changed into the test phase or not.
After the withstand voltage test of the single-phase cable of the high-voltage cable is completed, the phase cable is stopped being pressurized, the measured value of the sheath grounding current of the phase cable is lower than a set value, a partial discharge measuring module of the partial discharge recorder enters a standby state, when the phase is changed for pressurization, the measured value of the sheath grounding current exceeds the set value, the partial discharge measuring module is started again, and the partial discharge signal, the background noise signal and the sheath grounding current signal are measured and recorded.
At step s8, the pressure resistance test is completed.
The step is to finish the voltage withstand test of all the phase cables of the high-voltage cable.
And step s9, the tester takes back the four-channel partial discharge recorder, connects with the mobile phone and sends the data to the background analysis system.
After the withstand voltage tests of all the phase cables are completed, a tester arrives at a site to take the four-channel partial discharge recorder to a place with good mobile phone signals, the four-channel partial discharge recorder is connected with a mobile phone through a USB interface, and data recorded by the partial discharge recorder is sent to a server of a background analysis system for analysis and diagnosis.
And step s10, the background analysis system analyzes the partial discharge measurement data and judges whether partial discharge occurs in the withstand voltage test process.
The background server of the background analysis system detects the partial discharge state of the three-phase cable of the high-voltage cable in the withstand voltage test process according to the data recorded by the partial discharge recorder, and if the partial discharge occurs, the partial discharge state is detected.
The distributed partial discharge detection system for the high-voltage cable voltage-withstand test comprises a partial discharge sensor, a partial discharge recorder, an intelligent terminal and a background server, wherein the partial discharge recorder is arranged on a three-phase cable of the high-voltage cable and used for recording sheath grounding current and partial discharge signals of the three-phase cable during the voltage-withstand test, the sheath grounding current and the partial discharge signals are measured by the partial discharge recorder, the intelligent terminal derives the sheath grounding current and the partial discharge signals from the partial discharge recorder and transmits the sheath grounding current and the partial discharge signals to the background server in a wireless communication mode, the background server detects the partial discharge state of the three-phase cable of the high-voltage cable during the voltage-withstand test according to the sheath grounding current and the partial discharge signals, the partial discharge signals during the voltage-withstand test of the high-voltage cable are measured, and a plurality of four-channel partial discharge recorders, the method and the device realize measurement and recording of the partial discharge signals during the high-voltage cable voltage-withstanding test, compress the data volume of partial discharge detection, and greatly improve the working efficiency during field measurement.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a high tension cable withstand voltage test's distributed partial discharge detecting system which characterized in that includes: the system comprises a partial discharge sensor, a partial discharge recorder, an intelligent terminal and a background server which are connected in sequence; wherein the content of the first and second substances,
the partial discharge sensor is arranged on a three-phase cable of the high-voltage cable and is used for collecting sheath grounding current and partial discharge signals of the three-phase cable of the high-voltage cable during a voltage withstand test;
the partial discharge recorder is used for comparing sheath grounding current of the three-phase cable acquired by the partial discharge sensor with a set threshold value, and if the sheath grounding current of the three-phase cable is greater than the set threshold value, measuring a partial discharge signal of the three-phase cable through the partial discharge sensor and locally storing the partial discharge signal; the partial discharge sensor comprises a plurality of high-frequency partial discharge sensors which are respectively arranged on a sheath grounding wire of a cable joint of the three-phase cable; the partial discharge recorder is a multi-channel partial discharge recorder; each input channel of the multichannel partial discharge recorder is respectively connected with each high-frequency partial discharge sensor;
the intelligent terminal is used for deriving the partial discharge signal from the partial discharge recorder, communicating with the background server in a wireless communication mode and transmitting the partial discharge signal to the background server;
the background server is used for receiving the partial discharge signal sent by the intelligent terminal and determining the partial discharge state of the three-phase cable of the high-voltage cable during a withstand voltage test according to the partial discharge signal; the background server is also used for carrying out unified time synchronization on the multiple multi-channel partial discharge recorders.
2. The distributed partial discharge detection system for the high-voltage cable withstand voltage test according to claim 1, wherein the background server is further configured to determine a partial discharge type and a discharge defect position of a three-phase cable of the high-voltage cable according to a partial discharge signal of the three-phase cable;
and obtaining the partial discharge state of the three-phase cable of the high-voltage cable during the voltage withstand test according to the partial discharge type and the discharge defect position.
3. The distributed partial discharge detection system for the high-voltage cable withstand voltage test according to claim 2, wherein the background server is further configured to compare partial discharge signals of three-phase cables of the high-voltage cable on the same time scale to determine the partial discharge type;
determining the position of the discharge defect according to the amplitude of the partial discharge signal of the adjacent measuring point of the three-phase cable of the high-voltage cable; the measuring point is a position on the high-voltage cable for measuring a partial discharge signal of the three-phase cable.
4. The distributed partial discharge detection system for high voltage cable withstand voltage test according to claim 1, wherein the partial discharge sensor is configured to collect sheath ground current on a sheath ground wire of a cable joint of the three-phase cable and a partial discharge signal of the three-phase cable.
5. The distributed partial discharge detection system for high voltage cable withstand voltage test according to claim 4, wherein each signal input port of the multichannel partial discharge recorder is connected to each high frequency partial discharge sensor through a high frequency coaxial cable.
6. The distributed partial discharge detection system for the high-voltage cable withstand voltage test according to claim 1, wherein the intelligent terminal is a mobile phone.
7. The distributed partial discharge detection system for the high-voltage cable withstand voltage test according to claim 1, wherein the intelligent terminal is in communication connection with the partial discharge recorder through a communication interface.
8. The distributed partial discharge detection system for high voltage cable withstand voltage test according to claim 1, wherein the partial discharge recorder is further configured to measure a partial discharge signal of a three-phase cable of the high voltage cable through the partial discharge sensor of the three-phase cable when a sheath grounding current of any one phase of the three-phase cable exceeds the set threshold.
9. The distributed partial discharge detection system for the high-voltage cable withstand voltage test according to any one of claims 1 to 8, wherein the intelligent terminal is in communication connection with the partial discharge recorder through a USB interface, and is configured to derive the partial discharge signal from the partial discharge recorder through the USB interface.
10. A distributed partial discharge detection method for a high voltage cable withstand voltage test based on the distributed partial discharge detection system for a high voltage cable withstand voltage test according to any one of claims 1 to 9, comprising the steps of:
mounting the partial discharge sensor on a sheath ground wire at each cable joint of a three-phase cable of a high-voltage cable;
connecting the partial discharge sensor to a partial discharge recorder by using a high-frequency coaxial cable;
when the high-voltage cable is subjected to a voltage withstand test, the sheath grounding current and the local discharge signal of the three-phase cable of the high-voltage cable are collected through the local discharge sensor;
comparing sheath grounding current of the three-phase cable acquired by the partial discharge sensor with a set threshold value by using the partial discharge recorder, and if the sheath grounding current of the three-phase cable is greater than the set threshold value, measuring a partial discharge signal of the three-phase cable by using the partial discharge sensor and locally storing the partial discharge signal by using the partial discharge recorder; the partial discharge sensor comprises a plurality of high-frequency partial discharge sensors which are respectively arranged on a sheath grounding wire of a cable joint of the three-phase cable; the partial discharge recorder is a multi-channel partial discharge recorder; each input channel of the multichannel partial discharge recorder is respectively connected with each high-frequency partial discharge sensor;
deriving the partial discharge signal from the partial discharge recorder through an intelligent terminal, and sending the partial discharge signal to the background server in a wireless communication mode;
receiving the partial discharge signal sent by the intelligent terminal through the background server, and acquiring a partial discharge state of a three-phase cable of the high-voltage cable during a withstand voltage test; and uniformly timing a plurality of multi-channel partial discharge recorders through the background server.
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| CN102368089A (en) * | 2011-11-17 | 2012-03-07 | 江苏省电力公司南京供电公司 | Test method of carrying out partial discharge measurement based on high-voltage cable voltage withstand test |
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