CN108279366B - Distributed partial discharge detection method and device for high-voltage cable voltage withstand test - Google Patents
Distributed partial discharge detection method and device for high-voltage cable voltage withstand test Download PDFInfo
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- CN108279366B CN108279366B CN201810362055.5A CN201810362055A CN108279366B CN 108279366 B CN108279366 B CN 108279366B CN 201810362055 A CN201810362055 A CN 201810362055A CN 108279366 B CN108279366 B CN 108279366B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- 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
Abstract
The invention relates to a distributed partial discharge detection method and a distributed partial discharge detection device for a high-voltage cable withstand voltage test, wherein the method comprises the following steps: respectively acquiring sheath grounding currents of a three-phase cable of the high-voltage cable during a voltage withstand test; comparing the sheath grounding current of the three-phase cable with a set threshold value; if the sheath grounding current of the three-phase cable is larger than a set threshold value, acquiring a partial discharge signal of the three-phase cable measured by a partial discharge sensor of the three-phase cable; and 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 of the three-phase cable. The detection method realizes the measurement of the partial discharge signal during the high-voltage cable voltage-withstanding test, judges the sheath grounding current by using the set threshold, compresses the data volume of the measured partial discharge signal, and improves the work efficiency of detecting the partial discharge of the high-voltage cable. A distributed partial discharge detection system for the high-voltage cable withstand voltage test is also provided.
Description
Technical Field
The invention relates to the technical field of high-voltage cables, in particular to a distributed partial discharge detection method, a distributed partial discharge detection device and a distributed partial discharge detection system for a high-voltage cable voltage-withstanding 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 method for a high-voltage cable withstand voltage test, a distributed partial discharge detection device for a high-voltage cable withstand voltage test, and a distributed partial discharge detection system for a high-voltage cable withstand voltage test, in order to solve the problem of relatively low detection efficiency in the conventional technology.
A distributed partial discharge detection method for a high-voltage cable withstand voltage test comprises the following steps:
respectively acquiring sheath grounding currents of a three-phase cable of the high-voltage cable during a voltage withstand test;
comparing the sheath grounding current of the three-phase cable with a set threshold value; if the sheath grounding current of the three-phase cable is larger than a set threshold value, acquiring a partial discharge signal of the three-phase cable measured by a partial discharge sensor of the three-phase cable;
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 of the three-phase cable.
The distributed partial discharge detection method for the high-voltage cable withstand voltage test comprises the steps of respectively obtaining sheath grounding currents of three-phase cables of the high-voltage cables during the withstand voltage test, comparing the sheath grounding currents with a set threshold value, measuring partial discharge signals of the three-phase cables through a partial discharge sensor when the sheath grounding currents of the three-phase cables are larger than the set threshold value, determining the partial discharge state of the three-phase cables during the withstand voltage test according to the partial discharge signals, measuring the partial discharge signals during the high-voltage cable withstand voltage test, judging the sheath grounding currents by using the set threshold value, compressing the data volume of the measured partial discharge signals, and improving the work efficiency of detecting the partial discharge of the high-voltage cables.
In one embodiment, the step of respectively acquiring sheath grounding currents of the three-phase cables of the high-voltage cable when the high-voltage cable is subjected to the voltage withstand test comprises the following steps:
when the high-voltage cable is subjected to a voltage withstand test, detecting the sheath grounding current of the three-phase cable through a plurality of high-frequency partial discharge sensors; the high-frequency partial discharge sensors are respectively arranged on a sheath grounding wire of a cable joint of the three-phase cable.
In one embodiment, the step of detecting sheath ground currents of the three-phase cable by a plurality of high-frequency partial discharge sensors includes:
receiving current signals of a sheath grounding wire of the three-phase cable measured by the plurality of high-frequency partial discharge sensors through a multi-channel partial discharge recorder to obtain sheath grounding currents of the three-phase cable of the high-voltage cable; wherein each input channel of the multichannel partial discharge recorder is respectively connected to the plurality of high-frequency partial discharge sensors.
In one embodiment, the method further comprises the steps of:
and uniformly timing a plurality of multi-channel partial discharge recorders connected with the high-frequency partial discharge sensors.
In one embodiment, the step of acquiring the partial discharge signal of the three-phase cable measured by the partial discharge sensor of the three-phase cable if the sheath ground current of the three-phase cable is greater than a set threshold value includes:
and when the sheath grounding current of any phase of the cable of the three-phase cable exceeds the set threshold, measuring the partial discharge signal of the three-phase cable of the high-voltage cable through the partial discharge sensor of the three-phase cable.
In one embodiment, the step of determining the partial discharge state of the three-phase cable of the high-voltage cable when the withstand voltage test is performed according to the partial discharge signal of the three-phase cable includes:
determining the partial discharge type and the discharge defect position of the three-phase cable according to the 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 one embodiment, the step of determining the partial discharge type and the discharge defect position of the three-phase cable according to the partial discharge signal of the three-phase cable of the high-voltage cable comprises:
comparing partial discharge signals of the three-phase cable of the high-voltage cable under 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.
In one embodiment, a distributed partial discharge detection device for a high-voltage cable withstand voltage test is provided, the detection device comprising:
the acquisition module is used for respectively acquiring the sheath grounding current of the three-phase cable of the high-voltage cable during a voltage withstand test;
the comparison module is used for comparing the sheath grounding current of the three-phase cable with a set threshold value; if the sheath grounding current of the three-phase cable is larger than a set threshold value, acquiring a partial discharge signal of the three-phase cable measured by a partial discharge sensor of the three-phase cable;
and the determining module is used for determining the partial discharge state of the three-phase cable of the high-voltage cable during the withstand voltage test according to the partial discharge signal of the three-phase cable.
According to the distributed partial discharge detection device for the high-voltage cable voltage-withstand test, the sheath grounding current of the three-phase cable of the high-voltage cable during the voltage-withstand test is respectively obtained through the obtaining module, the sheath grounding current is compared with the set threshold value through the comparing module, the partial discharge signal of the three-phase cable is measured through the partial discharge sensor when the sheath grounding current of the three-phase cable is larger than the set threshold value, the partial discharge state of the three-phase cable during the voltage-withstand test is determined through the determining module according to the partial discharge signal, the partial discharge signal during the voltage-withstand test of the high-voltage cable is measured, the sheath grounding current is judged through the set threshold value, the data volume for measuring the partial discharge signal is compressed, and the working efficiency for detecting the partial discharge of the high-voltage cable is improved.
In one embodiment, a distributed partial discharge detection system for high voltage cable withstand voltage test is provided, the detection system comprising: the system comprises a partial discharge sensor, a partial discharge recorder, an intelligent terminal and a background server, wherein the partial discharge sensor, the partial discharge recorder, the intelligent terminal and the background server are arranged on a three-phase cable of the high-voltage cable; wherein the content of the first and second substances,
the signal input end of the partial discharge recorder is connected to the partial discharge sensor and is used for recording an electric signal measured by the partial discharge sensor; the electric signals comprise sheath grounding current and local discharge signals of the three-phase cable of the high-voltage cable during a voltage withstand test;
the intelligent terminal is used for deriving the electric signals recorded by the partial discharge recorder from the partial discharge recorder and transmitting the electric signals to the background server in a wireless communication mode;
the background server is configured to execute the distributed partial discharge detection method for the high-voltage cable voltage-withstanding test according to any one of the above embodiments, and detect a partial discharge state of a three-phase cable of the high-voltage cable when the voltage-withstanding test is performed.
The distributed partial discharge detection system for the high-voltage cable voltage-withstand test comprises a partial discharge sensor arranged on a three-phase cable of the high-voltage cable, a partial discharge recorder, an intelligent terminal and a background server, wherein the partial discharge recorder records sheath grounding current and partial discharge signals of the three-phase cable measured by the partial discharge sensor during the voltage-withstand test, 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 measurement of the partial discharge signals during the voltage-withstand test of the high-voltage cable is realized, the sheath grounding current is judged by utilizing a set threshold value, and the data volume for measuring the partial discharge signals is, the work efficiency of detecting the partial discharge of the high-voltage cable is improved.
In one embodiment, the partial discharge sensors include a plurality of sets of high frequency partial discharge sensors; each group of high-frequency partial discharge sensors comprises four high-frequency partial discharge sensors which are respectively arranged on a sheath grounding wire at the cable joint of the three-phase cable and near the cable joint;
the partial discharge recorder comprises a plurality of four-channel partial discharge recorders; and each four-channel partial discharge recorder is respectively connected with four high-frequency partial discharge sensors of each group of high-frequency partial discharge sensors through high-frequency coaxial cables.
Drawings
FIG. 1 is an environmental diagram illustrating an exemplary embodiment of a distributed partial discharge test for high voltage cable withstand voltage testing;
FIG. 2 is a flow chart of a distributed partial discharge detection method for a high voltage cable withstand voltage test in one embodiment;
FIG. 3 is a block diagram of a distributed partial discharge detection apparatus for a high-voltage cable withstand voltage test according to an embodiment;
FIG. 4 is a schematic structural diagram of a distributed partial discharge detection system for a high-voltage cable withstand voltage test in one embodiment;
fig. 5 is a flowchart of a distributed partial discharge detection method for a high-voltage cable withstand voltage test in another embodiment.
Detailed Description
The distributed partial discharge detection method for the high-voltage cable withstand voltage test provided by the invention can be applied to an application environment shown in fig. 1, fig. 1 is an application environment diagram of the distributed partial discharge detection method for the high-voltage cable withstand voltage test in one embodiment, the high-voltage cable 100 comprises an a-phase cable 100a, a B-phase cable 100B and a C-phase cable 100C, cable joints 200 are respectively arranged on three-phase cables, when the high-voltage cable is subjected to the withstand voltage test, partial discharge signals, background noise signals, sheath grounding current signals of the three-phase cables and other electrical signals of the three-phase cables can be measured through a plurality of partial discharge sensors 300 respectively arranged at the cable joints 200, and a background analysis system 20 can detect the partial discharge condition of the withstand voltage test of the three-phase cables of the high-voltage cable according to the electrical signals measured by the partial discharge. The background analysis system 20 may be implemented by a computer, an independent server, or a server cluster composed of a plurality of servers.
In an embodiment, a distributed partial discharge detection method for a high voltage cable withstand voltage test is provided, as shown in fig. 2, fig. 2 is a flowchart of the distributed partial discharge detection method for the high voltage cable withstand voltage test in an embodiment, and by taking an example that the method is applied to a background analysis system as shown in fig. 1, the distributed partial discharge detection method for the high voltage cable withstand voltage test may include the following steps:
step S101, respectively obtaining sheath grounding currents of the three-phase cables of the high-voltage cables during a voltage withstand test.
In this step, the sheath grounding current refers to a current on a A, B, C three-phase cable sheath grounding wire at a cable joint of the high-voltage cable, and when the three-phase cable of the high-voltage cable is subjected to a withstand voltage test, the background analysis system 20 can respectively obtain the sheath grounding currents on the sheath grounding wires of the a-phase cable, the B-phase cable and the C-phase cable of the high-voltage cable.
Step S102, comparing the sheath grounding current of the three-phase cable with a set threshold value; and if the sheath grounding current of the three-phase cable is larger than a set threshold value, acquiring a partial discharge signal of the three-phase cable measured by a partial discharge sensor of the three-phase cable.
The three-phase cable sheath ground current obtained in step S101 may be compared with a preset threshold value by the background analysis system 20, and if the value of the sheath ground current of the three-phase cable is greater than the threshold value, the partial discharge signal of the three-phase cable is measured by the partial discharge sensor on the three-phase cable, where the partial discharge signal of any phase cable of the high-voltage cable may be measured by the partial discharge sensor on the three-phase cable, for example, the partial discharge signal of the a-phase cable may be measured by the partial discharge sensor on the a-phase cable, so as to improve the flexibility and effectiveness of analyzing the three-phase cable sheath ground current of the high-voltage cable.
And step S103, determining the partial discharge state of the three-phase cable of the high-voltage cable when the withstand voltage test is carried out according to the partial discharge signal of the three-phase cable.
In this step, the background analysis system 20 analyzes and diagnoses the partial discharge signal of the three-phase cable during the voltage withstand test by using the partial discharge signal of the three-phase cable measured by the partial discharge sensor provided on the three-phase cable, so as to determine the partial discharge condition of the three-phase cable of the high-voltage cable during the voltage withstand test.
The distributed partial discharge detection method for the high-voltage cable withstand voltage test comprises the steps of respectively obtaining sheath grounding currents of three-phase cables of the high-voltage cables during the withstand voltage test, comparing the sheath grounding currents with a set threshold value, measuring partial discharge signals of the three-phase cables through a partial discharge sensor when the sheath grounding currents of the three-phase cables are larger than the set threshold value, determining the partial discharge state of the high-voltage three-phase cables during the withstand voltage test according to the partial discharge signals of the cables of the phases, measuring the partial discharge signals during the withstand voltage test of the high-voltage cables, judging the sheath grounding currents by using the set threshold value, compressing the data volume of the measured partial discharge signals, and improving the work efficiency of detecting the partial discharge of the high-voltage cables.
In one embodiment, the step of separately acquiring sheath ground currents of the three-phase cables of the high-voltage cable when performing the voltage withstand test in step S101 may include:
when the high-voltage cable is subjected to a withstand voltage test, the sheath grounding current of the three-phase cable is detected through a plurality of high-frequency partial discharge sensors.
In this embodiment, the high-frequency partial discharge sensor is mainly used for detecting the sheath ground current of the three-phase cable of the high-voltage cable, wherein the high-frequency partial discharge sensor can be arranged on the sheath ground wire of the cable joint of the three-phase cable, when the high-voltage cable is subjected to a voltage withstand test, the high-frequency partial discharge sensor can be used for measuring the sheath ground current of the three-phase cable, the number of the high-frequency partial discharge sensors can be multiple, each high-frequency partial discharge sensor can be respectively arranged on the sheath ground wires of A, B and each cable joint of the C three-phase cable, so that the sheath ground current at each cable joint of the three-phase cable can be obtained, the accuracy of measuring the sheath ground current data of the three-phase cable can be improved, and the accuracy of detecting the partial discharge condition of.
In one embodiment, the step of detecting sheath ground current of the three-phase cable by the plurality of high-frequency partial discharge sensors of step S101 may further include:
and receiving current signals of the sheath grounding wires of the three-phase cables measured by the high-frequency partial discharge sensors through the multi-channel partial discharge recorder to obtain the sheath grounding current of the three-phase cables of the high-voltage cables.
In this embodiment, the multichannel partial discharge recorder may be configured to measure and record signals of the high-frequency partial discharge sensors, and the multichannel partial discharge recorder may include a plurality of signal input channels, each input channel may be connected to each high-frequency partial discharge sensor disposed on the three-phase cable, for example, the plurality of high-frequency partial discharge sensors may be connected to the signal input channels of the multichannel partial discharge recorder through high-frequency coaxial cables, respectively.
In an embodiment, the distributed partial discharge detection method for the high-voltage cable withstand voltage test according to the above embodiment may further include the following steps:
and uniformly timing the plurality of multi-channel partial discharge recorders connected with the high-frequency partial discharge sensor.
The embodiment mainly considers that the number of cable joints of the three-phase cable is large, the number of partial discharge sensors arranged at the three-phase cable joints is correspondingly large, the individual partial discharge sensors can be connected by a plurality of multi-channel partial discharge recorders, such as connecting a plurality of high frequency partial discharge sensors of a three-phase cable to a nearby multichannel partial discharge recorder, by arranging a plurality of multi-channel partial discharge recorders, all high-frequency partial discharge sensors can be effectively connected in groups, in the embodiment, the multi-channel partial discharge recorders connected with the high-frequency partial discharge sensors in different groups can perform unified time synchronization so as to ensure the uniformity of data acquired by all the multi-channel partial discharge recorders, therefore, the accuracy of measuring the 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 step S102 of acquiring the partial discharge signal of the three-phase cable measured by the partial discharge sensor of the three-phase cable if the sheath grounding current of the three-phase cable is greater than the set threshold value may include:
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 grounding current of any one of the obtained three-phase cables is greater than the set threshold, the partial discharge sensors disposed on the three-phase cables measure the A, B, C partial discharge signals of the three-phase cables, that is, the partial discharge sensors disposed on the cables of each phase obtain the partial discharge signals of the three-phase cables.
The method can start a multichannel partial discharge recorder to measure the sheath grounding current in real time through a partial discharge sensor, when the measured value of the sheath grounding current of any phase of the cable exceeds a set threshold value, a partial discharge measurement module in the multichannel partial discharge recorder is automatically started, the partial discharge signal, the background noise signal and the sheath grounding current signal measured by the partial discharge measurement module are measured and recorded by the partial discharge measurement module, and if the measured value of the sheath grounding current of the three phases of the cable does not exceed the set threshold value, the multichannel partial discharge recorder is controlled 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 multichannel partial discharge recorder is switched, 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 also reduced.
In one embodiment, the step of determining the partial discharge state of the three-phase cable of the high-voltage cable when the withstand voltage test is performed according to the partial discharge signal of the three-phase cable of step S103 may include:
determining the partial discharge type and the discharge defect position of the three-phase cable according to the 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 partial discharge signals of a three-phase cable, the background analysis system 20 may import the data into a database, find out a measurement point where a 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 a valid partial discharge signal, if the acquired partial discharge signal is a valid 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 to exclude external discharge interference, and if discharge signals appear in each channel at the same time, determine the local discharge signal as 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.
And according to the judged partial discharge type and the position point of the partial discharge defect, the partial discharge state of the three-phase cable of the high-voltage cable during the voltage withstand test can be determined.
By adopting the technical scheme of the embodiment, the partial discharge state of the high-voltage cable during the voltage withstand test is detected by utilizing 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 one embodiment, a distributed partial discharge detection apparatus for a high voltage cable withstand voltage test is provided, and the detection apparatus may include: an acquisition module 101, a comparison module 102 and a determination module 103; wherein the content of the first and second substances,
the acquisition module 101 is used for respectively acquiring sheath grounding currents of a three-phase cable of the high-voltage cable during a voltage withstand test;
a comparison module 102, configured to compare a sheath grounding current of the three-phase cable with a set threshold; if the sheath grounding current of the three-phase cable is larger than a set threshold value, acquiring a partial discharge signal of the three-phase cable measured by a partial discharge sensor of the three-phase cable;
and the determining module 103 is configured to determine a partial discharge state of the three-phase cable of the high-voltage cable during a withstand voltage test according to the partial discharge signal of the three-phase cable.
In the distributed partial discharge detection device for the high-voltage cable withstand voltage test of the embodiment, the sheath ground currents of the three-phase cables of the high-voltage cables during the withstand voltage test are respectively obtained through the obtaining module 101, the sheath ground currents are compared with the set threshold value through the comparison module 102, when the sheath ground currents of the three-phase cables are larger than the set threshold value, the partial discharge signals of the three-phase cables are measured through the partial discharge sensor, the partial discharge state of the three-phase cables during the withstand voltage test is determined through the determination module 103 according to the partial discharge signals, the measurement of the partial discharge signals during the high-voltage cable withstand voltage test is realized, the sheath ground currents are judged through the set threshold value, the data volume of the measured partial discharge signals is compressed, and the work efficiency of detecting the partial discharge of the high-voltage cables is improved.
In an embodiment, a distributed partial discharge detection system for a high voltage cable withstand voltage test is provided, and referring to fig. 4, fig. 4 is a schematic structural diagram of the distributed partial discharge detection system for the high voltage cable withstand voltage test in an embodiment, where the distributed partial discharge detection system for the high voltage cable withstand voltage test may include: the partial discharge sensor 300, the partial discharge recorder 400, the intelligent terminal 500 and the background server 600 are arranged on the three-phase cable 100 of the high-voltage cable; wherein the content of the first and second substances,
the signal input end of the partial discharge recorder 400 is connected to the partial discharge sensor 300, and is used for recording electric signals measured by the partial discharge sensor 300, including sheath grounding current and partial discharge signals of a three-phase cable of a high-voltage cable during a withstand voltage test;
the intelligent terminal 500 is configured to derive an electrical signal recorded by the partial discharge recorder from the partial discharge recorder 400, and transmit the electrical signal to the background server 600 in a wireless communication manner;
the backend server 600 is configured to execute the distributed partial discharge detection method for the high-voltage cable withstand voltage test according to any one of the above embodiments, and detects a partial discharge state of the three-phase cable 100 of the high-voltage cable when the withstand voltage test is performed.
In this embodiment, the three-phase cable 100 includes 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 of cable, including cable joints such as a No. 1 cable joint 201, a No. 2 cable joint 202, a No. 3 cable joint 203, a No. 4 cable joint 204, and a No. 5 cable joint 205.
The partial discharge sensor 300 may include a plurality of groups of high frequency partial discharge sensors, and each group of high frequency partial discharge sensors may include four high frequency partial discharge sensors, which are respectively disposed on the sheath ground line at the cable joint of the three-phase cable and near the cable joint, and may be used to measure electric signals such as a partial discharge signal, a background noise signal, and a sheath ground current signal of the three-phase cable.
The partial discharge recorder 400 may include a plurality of four-channel partial discharge recorders, each of the four-channel partial discharge recorders may be respectively connected to the four high-frequency partial discharge sensors of each group of high-frequency partial discharge sensors through high-frequency coaxial cables to record electrical signals measured by the partial discharge sensors 300, and may include sheath ground currents, partial discharge signals, and background noise signals of a three-phase cable of a high-voltage cable during a withstand voltage test.
The intelligent terminal 500 may be connected to the partial discharge recorder 400 through a communication interface such as a USB interface, where the intelligent terminal may be a mobile phone, the electric signal data measured by the partial discharge sensor 300 is derived from the partial discharge recorder 400 through the intelligent terminal 500, and the intelligent terminal 500 sends the data to the background server 600 through a wireless network.
The backend server 600 may be configured to execute the distributed partial discharge detection method for the high-voltage cable withstand voltage test according to any embodiment, analyze and diagnose an electrical signal during the withstand voltage test, and detect a partial discharge state of the three-phase cable 100 of the high-voltage cable during the withstand voltage test.
Referring to fig. 5, fig. 5 is a flowchart of a distributed partial discharge detection method for a high-voltage cable withstand voltage test in another embodiment, where the distributed partial discharge detection system for a high-voltage cable withstand voltage test shown in fig. 4 may include the following steps:
and step s1, carrying out time synchronization on the four-channel partial discharge recorder through the background analysis system.
All four-channel partial discharge recorders can be gathered together, the server of the background analysis system is connected through a network cable, and all four-channel partial discharge recorders are subjected to unified time synchronization through the background analysis system.
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.
And step s4, the four-channel partial discharge recorder measures the sheath grounding current signal in real time and carries out intelligent threshold judgment.
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 enters a standby state.
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 withstand voltage test provided by the embodiment comprises a partial discharge sensor arranged on a three-phase cable of the high-voltage cable, a partial discharge recorder, an intelligent terminal and a background server, wherein the partial discharge recorder records sheath grounding current and partial discharge signals of the three-phase cable measured by the partial discharge sensor during the withstand voltage test, 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 withstand voltage test according to the sheath grounding current and the partial discharge signals, the measurement of the partial discharge signals during the withstand voltage test of the high-voltage cable is realized, and a plurality of four-channel partial discharge recorders with the function of judging the sheath grounding current threshold are adopted, 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. A distributed partial discharge detection method for a high-voltage cable withstand voltage test is characterized by comprising the following steps:
respectively acquiring sheath grounding currents of a three-phase cable of the high-voltage cable during a voltage withstand test;
comparing the sheath grounding current of the three-phase cable with a set threshold value; if the sheath grounding current of the three-phase cable is larger than a set threshold value, acquiring a partial discharge signal of the three-phase cable measured by a partial discharge sensor of the three-phase cable; the method comprises the following steps: when the sheath grounding current of any phase of the three-phase cable exceeds the set threshold, measuring the partial discharge signal of the three-phase cable of the high-voltage cable through the partial discharge sensor of the three-phase cable;
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 of the three-phase cable.
2. The distributed partial discharge detection method for the high-voltage cable withstand voltage test according to claim 1, wherein the step of respectively obtaining sheath grounding currents of the three-phase cables of the high-voltage cable during the withstand voltage test comprises:
when the high-voltage cable is subjected to a voltage withstand test, detecting the sheath grounding current of the three-phase cable through a plurality of high-frequency partial discharge sensors; the high-frequency partial discharge sensors are respectively arranged on a sheath grounding wire of a cable joint of the three-phase cable.
3. The distributed partial discharge detection method for the high voltage cable withstand voltage test according to claim 2, wherein the step of detecting the sheath ground current of the three-phase cable by the plurality of high frequency partial discharge sensors includes:
receiving current signals of a sheath grounding wire of the three-phase cable measured by the plurality of high-frequency partial discharge sensors through a multi-channel partial discharge recorder to obtain sheath grounding currents of the three-phase cable of the high-voltage cable; wherein each input channel of the multichannel partial discharge recorder is respectively connected to the plurality of high-frequency partial discharge sensors.
4. The distributed partial discharge detection method for the high-voltage cable withstand voltage test according to claim 3, further comprising the steps of:
and uniformly timing a plurality of multi-channel partial discharge recorders connected with the high-frequency partial discharge sensors.
5. The distributed partial discharge detection method for the high-voltage cable withstand voltage test according to any one of claims 1 to 4, wherein the step of determining the partial discharge state of the three-phase cable of the high-voltage cable during the withstand voltage test according to the partial discharge signal of the three-phase cable comprises:
determining the partial discharge type and the discharge defect position of the three-phase cable according to the 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.
6. The distributed partial discharge detection method for the high-voltage cable withstand voltage test according to claim 5, wherein the step of determining the partial discharge type and the discharge defect position of the three-phase cable according to the partial discharge signal of the three-phase cable of the high-voltage cable comprises:
comparing partial discharge signals of the three-phase cable of the high-voltage cable under 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.
7. The utility model provides a high tension cable withstand voltage test's distributed partial discharge detection device which characterized in that includes:
the acquisition module is used for respectively acquiring the sheath grounding current of the three-phase cable of the high-voltage cable during a voltage withstand test;
the comparison module is used for comparing the sheath grounding current of the three-phase cable with a set threshold value; if the sheath grounding current of the three-phase cable is larger than a set threshold value, acquiring a partial discharge signal of the three-phase cable measured by a partial discharge sensor of the three-phase cable; the device is further used for measuring the partial discharge signals of the three-phase cables of the high-voltage cable through the partial discharge sensors of the three-phase cables when the sheath grounding current of any one phase of the three-phase cables exceeds the set threshold;
and the determining module is used for determining the partial discharge state of the three-phase cable of the high-voltage cable during the withstand voltage test according to the partial discharge signal of the three-phase cable.
8. 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, wherein the partial discharge sensor, the partial discharge recorder, the intelligent terminal and the background server are arranged on a three-phase cable of the high-voltage cable; wherein the content of the first and second substances,
the signal input end of the partial discharge recorder is connected to the partial discharge sensor and is used for recording an electric signal measured by the partial discharge sensor; the electric signals comprise sheath grounding current and local discharge signals of the three-phase cable of the high-voltage cable during a voltage withstand test;
the intelligent terminal is used for deriving the electric signals recorded by the partial discharge recorder from the partial discharge recorder and transmitting the electric signals to the background server in a wireless communication mode;
the background server is configured to execute the distributed partial discharge detection method of the high-voltage cable voltage-withstanding test according to any one of claims 1 to 6, and detect the partial discharge state of the three-phase cable of the high-voltage cable when the voltage-withstanding test is performed.
9. The distributed partial discharge detection system for high-voltage cable withstand voltage test according to claim 8, wherein the partial discharge sensors include a plurality of sets of high-frequency partial discharge sensors; each group of high-frequency partial discharge sensors comprises four high-frequency partial discharge sensors which are respectively arranged on a sheath grounding wire at the cable joint of the three-phase cable and near the cable joint;
the partial discharge recorder comprises a plurality of four-channel partial discharge recorders; and each four-channel partial discharge recorder is respectively connected with four high-frequency partial discharge sensors of each group of high-frequency partial discharge sensors through high-frequency coaxial cables.
10. The distributed partial discharge detection system for the high-voltage cable withstand voltage test according to claim 8, wherein the intelligent terminal is connected with the partial discharge recorder through a USB interface.
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| CN110850149B (en) * | 2018-08-02 | 2021-09-14 | 许继集团有限公司 | High-voltage cable metal sheath grounding monitoring method and system |
| CN112067955A (en) * | 2020-09-16 | 2020-12-11 | 杭州西湖电子研究所 | Three-phase synchronous partial discharge detection method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN202305736U (en) * | 2011-09-23 | 2012-07-04 | 山西省电力公司长治供电分公司 | Partial discharge detection device of gas insulation combination electric appliance |
| CN103513169A (en) * | 2013-10-18 | 2014-01-15 | 国网上海市电力公司 | High voltage cable partial discharge detection method |
| CN104502812A (en) * | 2014-11-26 | 2015-04-08 | 国家电网公司 | Partial discharge acquisition method and apparatus |
| CN105765392A (en) * | 2013-11-29 | 2016-07-13 | 汉格诺Kmt缆线测量技术有限公司 | Method and device for locating partial discharges in electric cables |
| CN205720418U (en) * | 2016-06-21 | 2016-11-23 | 上海谷元电气科技有限公司 | High tension cable circulating current detector |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004347424A (en) * | 2003-05-21 | 2004-12-09 | Fujikura Ltd | Hot-line insulation deterioration diagnostic method and its device |
| CN103197215B (en) * | 2013-04-09 | 2015-11-18 | 国家电网公司 | GIS AC voltage withstand test discharge fault positioning system and method |
-
2018
- 2018-04-20 CN CN201810362055.5A patent/CN108279366B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202305736U (en) * | 2011-09-23 | 2012-07-04 | 山西省电力公司长治供电分公司 | Partial discharge detection device of gas insulation combination electric appliance |
| 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 |
| CN103513169A (en) * | 2013-10-18 | 2014-01-15 | 国网上海市电力公司 | High voltage cable partial discharge detection method |
| CN105765392A (en) * | 2013-11-29 | 2016-07-13 | 汉格诺Kmt缆线测量技术有限公司 | Method and device for locating partial discharges in electric cables |
| CN104502812A (en) * | 2014-11-26 | 2015-04-08 | 国家电网公司 | Partial discharge acquisition method and apparatus |
| CN205720418U (en) * | 2016-06-21 | 2016-11-23 | 上海谷元电气科技有限公司 | High tension cable circulating current detector |
Non-Patent Citations (1)
| Title |
|---|
| 暂态地电压与特高频法在局放检测中的应用;马飞越;《宁夏电力》;20160828(第4期);35页第2段 * |
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Effective date of registration: 20200925 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |