CN117517904A - Detection device is put in cubical switchboard office for electric wire netting - Google Patents
Detection device is put in cubical switchboard office for electric wire netting Download PDFInfo
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- 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
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Abstract
The invention provides a partial discharge detection device of a switch cabinet for a power grid, and belongs to the technical field of partial discharge detection. The device collects the relevant characteristic signals of the local discharge of the switch cabinet through the local discharge sensors of three detection modes arranged in the switch cabinet, transmits the relevant characteristic signals to the intelligent collection unit, the intelligent collection unit carries out digital conversion processing on the characteristic signals, the processed signals are transmitted to the data concentrator, and the processed signals are collected uniformly by the data concentrator and are connected with a control center server in a station or a remote place through a network transmission line. And (3) a staff of a server software system of a control center in a station or a remote place regularly checks wave line curves of all the sensors, if the wave line curves of all the sensors have the condition that partial discharge signals are gradually increased, if the wave line curves of all the sensors have obvious increasing trend or are obviously abnormal to detection values of other sensors, attention needs to be paid, and if the signals are larger than a threshold value, attention needs to be paid, inspection time is shortened, and a coping strategy is made.
Description
Technical Field
The invention belongs to the technical field of partial discharge detection, and particularly relates to a switch cabinet partial discharge detection device for a power grid.
Background
The metal-enclosed complete switch cabinet product is widely applied to various factories and mining enterprises, power transmission and transformation stations and the like, the safe and reliable operation of the switch equipment determines the reliability and the safety of power supply, and the metal-enclosed complete switch cabinet product occupies a significant position in a power supply system. The electrical equipment must have electrical property, thermal property, chemical property and insulation degradation formed under abnormal conditions in long-term operation, so that the strength of an electrical color-insulating edge is reduced, partial discharge is generated, and then faults occur, and the service life of the switch cabinet is influenced. Therefore, the detection of partial discharge signals in the switchgear equipment and the positioning of the detected signals are helpful for finding early insulation defects in time, judging the aging speed and the current state of the medium, avoiding the sudden accident of the switchgear, and has great significance for obviously reducing the fault probability of the switchgear equipment.
In the existing detection technology aiming at the partial discharge of the power grid switch cabinet, only one or two of ultrasonic detection, transient voltage detection or high-frequency current detection modes are often adopted, so that misjudgment of detection results is easy to occur; and moreover, the fault can be passively detected and analyzed, the daily monitoring data statistical analysis is lacked, and the trend breaking and early warning can not be actively carried out on potential fault risk points.
Disclosure of Invention
In view of the above, the invention aims to solve the technical problems that the existing switch cabinet partial discharge detection technology is single in detection mode, false alarm occurs in detection results, and only the generated fault data can be passively analyzed, daily monitoring data is lacking, and potential fault risk points cannot be actively subjected to trend breaking and early warning.
In order to solve the technical problems, the invention provides the following technical scheme:
a switchgear partial discharge detection device for a power grid, comprising: the system comprises a non-contact ultrasonic detection module, a transient voltage detection module, a high-frequency partial discharge current detection module, an intelligent acquisition unit, a data concentrator and a software system module;
the non-contact ultrasonic detection module is used for detecting ultrasonic signals generated when the power grid switch cabinet is partially discharged;
the transient ground voltage detection module is used for detecting a transient ground voltage signal generated on the box body when the power grid switch cabinet is partially discharged;
the high-frequency partial discharge current detection module is used for detecting a high-frequency current signal generated when the power grid switch cabinet is partially discharged;
the intelligent acquisition unit is used for converting the partial discharge characteristic signals detected by each detection module into signals which can be processed by the software system module and then sending the signals to the software system module through the data concentrator;
the software system module is used for processing and analyzing the partial discharge characteristic signals and actively monitoring the partial discharge condition and the fault hidden trouble of the power grid switch cabinet according to the amplitude and the change trend of the signals.
Further, the non-contact ultrasonic detection module specifically includes: the device comprises a non-contact ultrasonic sensor, a signal cable and a detection host;
the non-contact ultrasonic sensor is arranged outside the switch cabinet body and is used for detecting ultrasonic signals generated when the power grid switch cabinet is partially discharged and transmitting the ultrasonic signals to the detection host through the signal cable;
the detection host is used for transmitting detection signals to the intelligent acquisition unit.
Further, the transient ground voltage detection module specifically includes: the capacitive voltage division type TEV sensor, a signal cable and a TEV detector;
the capacitive voltage division type TEV sensor is arranged on the metal shell of the switch cabinet, is used for detecting transient ground voltage signals generated on the box body when the power grid switch cabinet is partially discharged, and is transmitted to the TEV detector through a signal cable;
the TEV detector is used for transmitting detection signals to the intelligent acquisition unit.
Further, the high-frequency partial discharge current detection module specifically includes: the switch cabinet is grounded and led to the wire, the high-frequency sensor and the detection host;
one end of the switch cabinet grounding guide wire is electrically connected with the switch cabinet, and the other end of the switch cabinet grounding guide wire is electrically connected with the ground;
the high-frequency sensor is arranged on the grounding guide line of the switch cabinet, and is used for detecting a high-frequency current signal generated when the power grid switch cabinet is partially discharged and transmitting the detection signal to the detection host;
the detection host is used for transmitting detection signals to the intelligent acquisition unit.
Further, the intelligent acquisition unit converts the partial discharge characteristic signals, specifically:
the intelligent acquisition unit converts the acoustic wave, voltage and current analog signals serving as the partial discharge characteristic signals into digital signals.
Further, the front end of the data concentrator is in signal connection with the intelligent acquisition units corresponding to the switch cabinets, and the rear end of the data concentrator is in signal connection with the software system module;
the data concentrator is used for uniformly integrating the data processed by the intelligent acquisition unit and then transmitting the data to the corresponding receiving end in different communication modes;
the data concentrator is arranged at the middle position of the switch cabinet electric room, keeps a set height with the ground and cannot be in a metal shielding state, and is provided with an omnidirectional communication antenna, a sensor state indicating lamp and a plurality of interfaces, wherein the sensor state indicating lamp is used for indicating the working conditions of the data concentrator and a corresponding intelligent acquisition unit.
Further, the software system module includes: a data display unit;
the data display unit is used for dividing the partial discharge characteristic signals according to different switch cabinets, and displaying data in the form of partial discharge trend lines and partial discharge patterns, wherein the display content at least comprises ultrasonic detection trend lines, transient ground voltage detection trend lines, high-frequency partial discharge current detection trend lines and a data analysis area.
Further, the software system module further includes: a result output unit;
the result output unit is used for outputting corresponding data analysis results according to external instructions, wherein the data analysis results comprise a partial discharge wave line phase straight line graph, a PRPS graph, a PRPD graph and a test graph.
Further, the software system module further includes: a system setting unit;
the system setting unit is used for setting the working parameters of the system according to external instructions; and is also used for setting the sensor parameters according to external instructions.
Further, in the system setting unit, the set system working parameters at least include a data concentrator IP, a sampling interval and a refresh list, and the sensor parameters at least include a local discharge attention threshold, an alarm threshold, a count threshold and a filter switch of an ultrasonic sensor, a transient ground voltage sensor and a high-frequency current sensor.
In summary, the invention provides a switch cabinet partial discharge detection device for a power grid, which is characterized in that local discharge related characteristic signals of a switch cabinet are collected through local discharge sensors of three detection modes arranged in the switch cabinet and are transmitted to an intelligent collection unit, the intelligent collection unit carries out digital conversion processing on the characteristic signals, the processed signals are transmitted to a data concentrator, and the processed signals are collected uniformly by the data concentrator and are connected with a control center server in a station or a remote place through a network transmission line. And (3) a staff of a server software system of a control center in a station or a remote place regularly checks wave line curves of all the sensors, if the wave line curves of all the sensors have the condition that partial discharge signals are gradually increased, if the wave line curves of all the sensors have obvious increasing trend or are obviously abnormal to detection values of other sensors, attention needs to be paid, and if the signals are larger than a threshold value, attention needs to be paid, inspection time is shortened, and a coping strategy is made.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a monitoring device for partial discharge of a switchgear for a power grid, which is provided by an embodiment of the invention;
FIG. 2 is a schematic view of a three-mode sensor mounting structure in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the operation of a non-contact ultrasonic detection module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the operation of a transient ground voltage detection module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the operation of a high frequency partial discharge current detection module according to an embodiment of the present invention;
FIG. 6 is a front panel structural design of a data concentrator in an embodiment of the present invention;
FIG. 7 is a back panel interface design of a data concentrator in an embodiment of the present invention;
FIG. 8 is a schematic diagram of data transmission in an embodiment of the present invention;
fig. 9 is a diagram of a working architecture in an embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. a bus; 2. a switch cabinet housing; 3. a switch cabinet primary chamber; 4. an intelligent acquisition unit; 5. a data concentrator; 6. a server; 7. a control cabinet; 8. a software system interface; 9. a switch cabinet secondary chamber;
11. a non-contact ultrasonic (AA) wave sensor; 12. a transient ground voltage (TEV) sensor; 13. a High Frequency Current (HFCT) sensor; 14. a ground guide wire;
21. a data concentrator front panel; 22. a sensor status indicator light; 23. a power switch; 24. a Lora communication antenna (omni-directional);
31. a data concentrator back plane; 32. an AC220 interface; 33. an RJ45 network cable interface; 34. 485 interface.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a detection device is put with cubical switchboard office to electric wire netting, includes: the system comprises a non-contact ultrasonic detection module, a transient voltage detection module, a high-frequency partial discharge current detection module, an intelligent acquisition unit, a data concentrator and a software system module;
the non-contact ultrasonic detection module is used for detecting ultrasonic signals generated when the power grid switch cabinet is partially discharged;
the transient ground voltage detection module is used for detecting a transient ground voltage signal generated on the box body when the power grid switch cabinet is partially discharged;
the high-frequency partial discharge current detection module is used for detecting a high-frequency current signal generated when the power grid switch cabinet is partially discharged;
the intelligent acquisition unit is used for converting the partial discharge characteristic signals detected by each detection module into signals which can be processed by the software system module and then sending the signals to the software system module through the data concentrator;
the software system module is used for processing and analyzing the partial discharge characteristic signals and actively monitoring the partial discharge condition and the fault hidden trouble of the power grid switch cabinet according to the amplitude and the change trend of the signals.
The inventor of the application finds that in the existing detection technology for the partial discharge of the power grid switch cabinet, a switch cabinet partial discharge detection and positioning system based on the Internet of things is disclosed, and particularly provides a switch cabinet partial discharge detection and positioning system based on the Internet of things, the system processes acquired signals by adopting methods such as digital filtering, wavelet noise reduction and the like, and detects and analyzes the partial discharge by adopting a transient ground voltage detection method; an improved Levenberg-Marquardt (LM) partial discharge positioning algorithm is embedded in an acousto-electric combination method combining ultrasonic waves and high-frequency current to position a partial discharge source. However, in the existing detection technology for the partial discharge of the power grid switch cabinet including the prior art, only one or two of ultrasonic detection, transient voltage detection or high-frequency current detection modes are adopted, so that misjudgment of detection results is easy to occur; and only the faults can be passively detected and analyzed, the daily monitoring data statistical analysis is lacked, and the potential fault risk points cannot be actively subjected to trend breaking and early warning.
According to the switch cabinet partial discharge detection device for the power grid, the local discharge related characteristic signals of the switch cabinet are collected through the local discharge sensors of the three detection modes arranged in the switch cabinet and are transmitted to the intelligent collection unit, the intelligent collection unit carries out digital conversion processing on the characteristic signals, the processed signals are transmitted to the data concentrator, and the processed signals are collected uniformly by the data concentrator and are connected with the control center server in the station or in a remote place through the network transmission line. And (3) a staff of a server software system of a control center in a station or a remote place regularly checks wave line curves of all the sensors, if the wave line curves of all the sensors have the condition that partial discharge signals are gradually increased, if the wave line curves of all the sensors have obvious increasing trend or are obviously abnormal to detection values of other sensors, attention needs to be paid, and if the signals are larger than a threshold value, attention needs to be paid, inspection time is shortened, and a coping strategy is made.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a monitoring device for partial discharge of a switchgear for a power grid. Wherein, busbar 1 is connected at switch cabinet casing 2 upper portion, and inside includes switch cabinet primary chamber 3 and switch cabinet secondary chamber 9. The intelligent acquisition unit 4 is arranged inside the secondary chamber 9 of the switch cabinet, and the data concentrator 5, the server 6 and the software system interface 8 are all arranged at the control cabinet 7.
Referring to fig. 2, fig. 2 is a schematic view of a three-mode sensor mounting structure. A non-contact ultrasonic (AA) wave sensor 11, a transient ground voltage (TEV) sensor 12, a High Frequency Current (HFCT) sensor 13, and a ground lead 14 are all installed in the switchgear primary chamber 3.
In one embodiment of the invention, the non-contact ultrasonic detection module comprises a non-contact ultrasonic sensor, a signal cable and a detection host. Based on the acoustic wave emission principle (AA), when the power grid switch cabinet is partially discharged, acoustic wave signals with the frequency spectrum ranging from tens of Hz to a few MHzD are generated, and the signals with the frequency spectrum higher than 20kHz cannot be heard by human ears, so that the ultrasonic wave is called ultrasonic wave. The ultrasonic signal must be received by an ultrasonic sensor. According to the relation between the energy released by discharge and acoustic energy, the amplitude, phase, frequency, noise and the like of ultrasonic signals and the relation between the ultrasonic signals and operation (application) voltage are detected through a non-contact ultrasonic sensor, and the insulation defect degree and the insulation defect position of power equipment such as a switch cabinet can be effectively detected without contacting with the partial discharge position. The working schematic diagram of the non-contact ultrasonic detection module is shown in fig. 3, and it can be understood that the non-contact ultrasonic detection module in fig. 3 realizes ultrasonic detection based on the acoustic wave emission principle, which is a well-known technology and will not be described herein.
In one embodiment of the invention, the transient voltage detection module comprises a capacitive voltage division type TEV sensor, a signal cable and a TEV detector. Based on the fact that the normal power equipment rarely emits transient electric wave signals between 3 MHz and 100MHz, when partial discharge occurs in the switch equipment, electromagnetic waves are generated, when the electromagnetic waves are conducted in a metal box body, transient ground voltage (TEV) is generated on the metal box body of the switch cabinet, and the voltage is measured through a capacitive voltage division type TEV sensor arranged on an inner shell and an outer shell of the metal of the switch cabinet, so that the insulation defect degree and the insulation defect position of the power equipment such as the switch cabinet are effectively detected. The operation schematic diagram of the transient ground voltage detection module is shown in fig. 4, and it can be understood that the transient ground voltage detection module in fig. 4 performs transient ground voltage detection according to the prior art, which is not described herein.
In one embodiment of the invention, the high frequency partial discharge current detection module comprises a switch cabinet grounding lead, a high frequency sensor (HFCT) and a detection host. One end of the grounding guide wire is electrically connected with the switch cabinet, and the other end of the grounding guide wire is electrically connected with the ground; the middle part of the grounding lead wire is connected with a high frequency and high frequency sensor (HFCT). Based on the high-frequency current detection principle, when the switch cabinet is partially discharged, the emitted high-frequency current is transmitted to the ground through the grounding guide wire, a high-frequency current signal is received by a high-frequency sensor (HFCT) and fed back to a detection host, and the insulation defect degree and the position of power equipment such as a transformer and the like, such as partial discharge defect, floating potential defect, loosening defect and the like, can be effectively reflected through analysis and discrimination of the amplitude, phase, frequency and the like of the detection signal and the relation between the detection signal and the operation (applied) voltage. Fig. 5 is a schematic working diagram of a high-frequency partial discharge current detection module according to an embodiment of the present invention, and it can be understood that the high-frequency partial discharge current detection module in fig. 5 performs high-frequency current detection according to a conventional technology, which is not described herein.
In one embodiment of the invention, the front end of the intelligent acquisition unit is in signal connection with the partial discharge sensor in the corresponding mode, and the rear end of the intelligent acquisition unit is in signal connection with the data concentrator. And after receiving the local characteristic signals acquired by the front-end local sensor, the intelligent acquisition unit processes the signals, converts analog signals such as sound waves, voltage and current into digital signals, and transmits the digital signals to the data concentrator at the rear end.
Referring to fig. 6-8, in one embodiment of the present invention, the front end of the data concentrator is in signal connection with the intelligent acquisition unit (i.e., with the switch cabinet partial discharge severe monitoring unit of fig. 8), and the back end is in signal connection with the remote control center server (i.e., with the local monitoring software of fig. 8). The data concentrator unifies and gathers the data processed by the intelligent acquisition units, and performs data interaction with a local server of a control center in a station or a remote place through various communication modes such as network cables, optical fibers and the like. The data concentrator is arranged in the middle of the switch cabinet electric room, keeps a certain height with the ground and cannot be sealed in the metal box. A data concentrator front panel 21 is provided with a Lora communication antenna (omnidirectional) 24, a sensor status indicator lamp 22 and a power switch 23; the data concentrator back panel 31 is 485 interface 34, RJ45 network cable interface 33, and AC220 power interface 32. The data concentrator starts working after being electrified, the status LEDs on the front panel are sequentially lightened, and the device performs self-checking. And after the self-checking is finished, the corresponding indicator lamp is lightened according to the configuration condition of the intelligent acquisition unit. The signal transmission between the data concentrator and the server may be a wireless Lora system, or may be a network cable, an optical fiber, or the like.
In one embodiment of the invention, the software system comprises three parts, namely data display, result display and system setting. The data display part displays the field partial discharge data sampled by each intelligent acquisition unit acquired from the data concentrator to a user in the form of a partial discharge trend line and a partial discharge map according to different numbered sensors, and the interface comprises an ultrasonic detection trend line, a transient ground voltage detection trend line, a high-frequency partial discharge current detection trend line and a data analysis area;
the result display part displays a partial discharge wave line phase straight line graph, a PRPS graph and a PRPD graph of the test time point, and can derive a current test map as a follow-up operation inspection report material according to the needs of a user;
the system setting part comprises test setting and sensor setting, wherein the test setting is used for setting system working parameters according to the needs of a user and comprises a data concentrator IP, a sampling interval and a refreshing list; the sensor is used for setting a partial discharge attention threshold value, an alarm threshold value, a counting threshold value and a filter switch of the ultrasonic sensor, the transient ground voltage sensor and the high-frequency current sensor.
Referring to fig. 9, the working principle of the whole device is that local discharge related characteristic signals of a switch cabinet are collected through local discharge sensors (non-contact ultrasonic sensors, capacitive voltage division type TEV sensors and High Frequency Sensors (HFCTs)) of three detection modes in the switch cabinet, the local discharge related characteristic signals are transmitted to an intelligent collection unit, the intelligent collection unit performs digital conversion processing on the characteristic signals, the processed signals are transmitted to a data concentrator, and the processed signals are collected together through the data concentrator and a control center server in a station or in a remote place through a network transmission line. And (3) a staff of a server software system of a control center in a station or a remote place regularly checks wave line curves of all the sensors, if the wave line curves of all the sensors have the condition that partial discharge signals are gradually increased, if the wave line curves of all the sensors have obvious increasing trend or are obviously abnormal to detection values of other sensors, attention needs to be paid, and if the signals are larger than a threshold value, attention needs to be paid, inspection time is shortened, and a coping strategy is made.
Compared with the prior art, the detection device provided by the invention has the following advantages:
(1) The distributed layout has strong expansibility. And monitoring the networked layout of the terminal, and automatically identifying and configuring the terminal without additional setting when the terminal is added or removed on the basis of the original layout.
(2) And the real-time monitoring is convenient. The system records real-time data of each monitoring node, and the monitoring period can be flexibly set.
(3) Has edge computing capability. The system has an on-site digitizing function, the acquisition device can digitize the partial discharge signal on site, so that the data processing is greatly simplified, the data is analyzed and diagnosed in different places, and the data reproduction backtracking mechanism ensures the accuracy of data transmission.
(4) A variety of communication schemes are alternatives. Lora, 485 or network cables can be used between the acquisition unit and the intelligent gateway to flexibly adapt to the site situation.
(5) High sensitivity. The discharge signal of 5PC was detected at the minimum.
(6) And a timely early warning function is provided. When a node monitors abnormal partial discharge, the abnormal partial discharge is fed back to a monitoring server, and the server software records necessary information and gives an alarm.
(7) Impact resistance and interference resistance. The device can bear 600KV flashover impact, and terminal equipment is not damaged and data is not lost. The method has the advantages of being capable of effectively separating interference signals and partial discharge signals and effectively avoiding interference of a power supply end of an instrument.
(8) The signal transmission is stable. The data can be directly and remotely transmitted to the server by means of a strong mobile network, the transmission performance is reliable, and the network delay is small.
(9) The access security is good. The access of the system does not influence the sealing and insulating properties of the switch cabinet and the safe operation of the equipment.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. Detection device is put with cubical switchboard office to electric wire netting, characterized by includes: the system comprises a non-contact ultrasonic detection module, a transient voltage detection module, a high-frequency partial discharge current detection module, an intelligent acquisition unit, a data concentrator and a software system module;
the non-contact ultrasonic detection module is used for detecting ultrasonic signals generated when the power grid switch cabinet is partially discharged;
the transient ground voltage detection module is used for detecting a transient ground voltage signal generated on the box body when the power grid switch cabinet is partially discharged;
the high-frequency partial discharge current detection module is used for detecting a high-frequency current signal generated when the power grid switch cabinet is partially discharged;
the intelligent acquisition unit is used for converting the partial discharge characteristic signals detected by each detection module into signals which can be processed by the software system module and then sending the signals to the software system module through the data concentrator;
the software system module is used for processing and analyzing the partial discharge characteristic signals and actively monitoring the partial discharge condition and the fault hidden trouble of the power grid switch cabinet according to the amplitude and the change trend of the signals.
2. The power grid switchgear partial discharge detection device according to claim 1, wherein the non-contact ultrasonic detection module specifically comprises: the device comprises a non-contact ultrasonic sensor, a signal cable and a detection host;
the non-contact ultrasonic sensor is arranged outside the switch cabinet body and is used for detecting ultrasonic signals generated when the power grid switch cabinet is partially discharged and transmitting the ultrasonic signals to the detection host through the signal cable;
the detection host is used for transmitting detection signals to the intelligent acquisition unit.
3. The switchgear partial discharge detection device for a power grid according to claim 1, wherein the transient ground voltage detection module specifically comprises: the capacitive voltage division type TEV sensor, a signal cable and a TEV detector;
the capacitive voltage division type TEV sensor is arranged on the metal shell of the switch cabinet, and is used for detecting transient ground voltage signals generated on the box body when the power grid switch cabinet is partially discharged and transmitting the transient ground voltage signals to the TEV detector through the signal cable;
the TEV detector is used for transmitting detection signals to the intelligent acquisition unit.
4. The switchgear partial discharge detection device for a power grid according to claim 1, wherein the high-frequency partial discharge current detection module specifically comprises: the switch cabinet is grounded and led to the wire, the high-frequency sensor and the detection host;
one end of the switch cabinet grounding guide wire is electrically connected with the switch cabinet, and the other end of the switch cabinet grounding guide wire is electrically connected with the ground;
the high-frequency sensor is arranged on the grounding guide line of the switch cabinet and is used for detecting a high-frequency current signal generated when the power grid switch cabinet is partially discharged and transmitting the detection signal to the detection host;
the detection host is used for transmitting detection signals to the intelligent acquisition unit.
5. The power grid switchgear partial discharge detection device according to claim 1, wherein the intelligent acquisition unit converts the partial discharge characteristic signal, specifically:
the intelligent acquisition unit converts the sound wave, voltage and current analog signals serving as the partial discharge characteristic signals into digital signals.
6. The power grid switchgear partial discharge detection device according to claim 1, wherein the front end of the data concentrator is in signal connection with the intelligent acquisition units corresponding to the switchgears, and the rear end of the data concentrator is in signal connection with the software system module;
the data concentrator is used for uniformly integrating the data processed by the intelligent acquisition unit and then transmitting the data to a corresponding receiving end in different communication modes;
the data concentrator is arranged at the middle position of the switch cabinet electric room, keeps a set height with the ground and cannot be in a metal shielding state, and is provided with an omnidirectional communication antenna, a sensor state indicating lamp and a plurality of interfaces, wherein the sensor state indicating lamp is used for indicating the working conditions of the data concentrator and the corresponding intelligent acquisition units.
7. The switchgear partial discharge detection device for electrical network according to claim 1, wherein the software system module comprises: a data display unit;
the data display unit is used for dividing the partial discharge characteristic signals according to different switch cabinets, and displaying data in the form of partial discharge trend lines and partial discharge patterns, wherein the display content at least comprises ultrasonic detection trend lines, transient ground voltage detection trend lines, high-frequency partial discharge current detection trend lines and a data analysis area.
8. The switchgear partial discharge detection device for an electrical network according to claim 1, wherein the software system module further comprises: a result output unit;
the result output unit is used for outputting corresponding data analysis results according to external instructions, wherein the data analysis results comprise a partial discharge wave line phase straight line graph, a PRPS graph, a PRPD graph and a test graph.
9. The switchgear partial discharge detection device for an electrical network according to claim 1, wherein the software system module further comprises: a system setting unit;
the system setting unit is used for setting working parameters of the system according to external instructions; and is also used for setting the sensor parameters according to external instructions.
10. The switchgear partial discharge detection device for electrical network according to claim 9, wherein in the system setting unit, the set system operation parameters include at least a data concentrator IP, a sampling interval, and a refresh list, and the sensor parameters include at least a partial discharge attention threshold, an alarm threshold, a count threshold, and a filter switch of an ultrasonic sensor, a transient ground voltage sensor, and a high-frequency current sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311679553.XA CN117517904A (en) | 2023-12-08 | 2023-12-08 | Detection device is put in cubical switchboard office for electric wire netting |
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| CN202311679553.XA CN117517904A (en) | 2023-12-08 | 2023-12-08 | Detection device is put in cubical switchboard office for electric wire netting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117783797A (en) * | 2024-02-28 | 2024-03-29 | 国网山东省电力公司莒县供电公司 | Power distribution automatic switch partial discharge detection early warning system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117783797A (en) * | 2024-02-28 | 2024-03-29 | 国网山东省电力公司莒县供电公司 | Power distribution automatic switch partial discharge detection early warning system |
| CN117783797B (en) * | 2024-02-28 | 2024-05-10 | 国网山东省电力公司莒县供电公司 | Power distribution automatic switch partial discharge detection early warning system |
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