CN115575777A - Medium-voltage cable state online monitoring method and system - Google Patents
Medium-voltage cable state online monitoring method and system Download PDFInfo
- Publication number
- CN115575777A CN115575777A CN202211207168.0A CN202211207168A CN115575777A CN 115575777 A CN115575777 A CN 115575777A CN 202211207168 A CN202211207168 A CN 202211207168A CN 115575777 A CN115575777 A CN 115575777A
- Authority
- CN
- China
- Prior art keywords
- cable
- detection unit
- impedance spectrum
- monitoring
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/026—Dielectric impedance spectroscopy
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a medium voltage cable state on-line monitoring method and a system, the method firstly arranges a cable insulation state on-line monitoring device at a corresponding position for signal acquisition, then transmits acquired broadband impedance spectrum, partial discharge, grounding current and temperature data to a cable insulation monitoring edge intelligent device, the cable insulation monitoring edge intelligent device carries out edge analysis and calculation of the broadband impedance spectrum, the partial discharge, the grounding current and the temperature data, if a certain criterion is abnormal twice or more than two criteria are abnormal, the output cable insulation state is abnormal, and the cable insulation state on-line monitoring system gathers the analysis data of the cable insulation monitoring edge intelligent device for data display and alarm. The invention can realize on-line and nondestructive monitoring of the medium-voltage cable based on multi-source information such as impedance spectrum, partial discharge and the like.
Description
Technical Field
The invention relates to the field of cable state monitoring, in particular to a method and a system for monitoring the state of a medium-voltage cable on line based on multi-state parameters such as impedance spectrums, partial discharge and the like.
Background
Urban underground cable line structure is complicated, the operational environment is various, equipment density is growing day by day, and the risk that distribution cable line trouble brought is progressively severe, in case break down, will seriously influence urban power grid operation safety. Therefore, the operation and maintenance management and intrinsic safety control level of the distribution cable equipment directly influence the safe and stable operation of the urban power grid, and the specialized lean management of the distribution cable faces new challenges.
The current medium-voltage distribution network cable state assessment means mainly takes daily manual inspection and offline detection as main means, but due to the fact that a plurality of limits of cable net rack construction, laying channels and pressure drop plan power failure maintenance time are limited, the popularization and application of an offline test technology are difficult to develop. In addition, because of the obvious difference of the primary equipment structure of the distribution cable system and the high-voltage cable system, the restrictive problems of poor technical adaptability, high cost and the like exist in the medium-voltage cable state sensing directly along with the high-voltage cable sensor principle and the configuration thought, in order to further reduce the influence of state detection on the line power failure maintenance time, potential damage of high-voltage tests to insulation of old cables is reduced, the working requirements of medium-voltage distribution network cables with large support scale and geographical dispersion are met, nondestructive and online monitoring technical means suitable for the medium-voltage cables need to be researched and established urgently, and the state perception application convenience is improved. Therefore, there is a need to develop a method and a system for online monitoring of the insulation state of a distribution cable based on multiple states such as impedance spectroscopy and partial discharge.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a system for monitoring the state of a medium-voltage cable on line, which realize the on-line and nondestructive monitoring of the medium-voltage cable based on multi-source information such as impedance spectrum, partial discharge and the like.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: a medium voltage cable state online monitoring method comprises the following steps:
s01), arranging a cable insulation state on-line monitoring device at a corresponding position for signal acquisition, wherein the cable insulation state on-line monitoring device comprises a broadband impedance spectrum detection unit, a grounding current detection unit, an partial discharge detection unit and a cable temperature detection unit, the broadband impedance spectrum detection unit is installed on an elbow-shaped head of a switch cabinet, the grounding current detection unit is installed on a grounding wire, and the partial discharge detection unit and the cable temperature detection unit are installed on an insulation connector and are respectively used for acquiring an impedance spectrum signal, grounding current, a partial discharge signal and cable temperature at the installation position;
s02) setting communication parameters of the cable insulation state on-line monitoring device, calibrating grounding current and cable surface temperature measurement, determining a calibration coefficient and storing the calibration coefficient;
s03), acquiring broadband impedance spectrum, partial discharge, grounding current and temperature data by the cable insulation state online monitoring device, and transmitting the data to the cable insulation monitoring edge intelligent device;
s04), the intelligent cable insulation monitoring edge device performs edge analysis and calculation on the broadband impedance spectrum, the partial discharge, the grounding current and the temperature data;
respectively monitoring the head and tail ends of the tested cable and impedance parameters with different lengths aiming at the broadband impedance spectrum signal, and judging whether the head and tail ends of the tested cable have short circuit and open circuit or not and whether the impedance parameters with different lengths of the tested cable are abnormal or not by combining a model of the tested cable in a threshold comparison mode;
monitoring partial discharge capacity, discharge frequency and discharge phase of cables in different phases aiming at partial discharge signals, and judging discharge types;
judging and analyzing the temperature abnormality of the cable according to a threshold value aiming at the temperature signal of the cable;
analyzing the grounding current abnormity by processing the ring ratio increase rate and the maximum/minimum value aiming at the grounding current signals;
if the certain criterion is abnormal twice or more than two criteria are abnormal, the insulation state of the output cable is abnormal;
s05), transmitting an analysis result of the intelligent cable insulation monitoring edge device to an online cable insulation state monitoring system, and gathering analysis data of the intelligent cable insulation monitoring edge device by the online cable insulation state monitoring system to display and alarm the data.
In order to realize the nondestructive monitoring of the insulation state of the cable and the injection of impedance spectrum signals, the broadband impedance spectrum detection unit comprises a signal generator and a signal collector, the input side of the signal generator is connected with the intelligent device at the insulation monitoring edge of the cable, the output side of the signal generator is connected with the cable and the signal collector, the signal collector collects impedance spectrum signals through a broadband impedance spectrum signal coupling sensor, the broadband impedance spectrum signal coupling sensor comprises a film capacitor, a filter, a capacitor and an inductor, the film capacitor is wrapped on an elbow-shaped head of a switch cabinet and then leads out a connecting wire to be grounded, the filter is connected between the film capacitor and a grounding terminal, the injection and collection of impedance spectrum and temperature measurement signals are carried out through the filter, and the capacitor and the inductor are connected between a cable sheath and the grounding terminal in series.
After receiving the data of the intelligent cable insulation monitoring edge device, the cable insulation state monitoring system forms a temperature-time curve, a grounding current-time curve, an impedance-length curve and a partial discharge monitoring data spectrogram, and performs cable insulation state alarm by combining the analysis condition of the intelligent cable insulation monitoring edge device.
When the broadband impedance spectrum signal is collected, the impedance spectrum detection unit is matched with the signal channel switching module, 3 phases are divided to perform time-sharing injection and reflection signal collection of the impedance spectrum detection signal, the impedance conditions of different lengths of the cable are monitored, and a complete broadband impedance spectrum of the tested cable is formed.
When cable partial discharge signals are collected, the cable partial discharge detection unit collects partial discharge signals through the high-frequency current sensor and forms PRPD and PRPS data which serve as a basis for judging discharge capacity.
When the cable temperature and the sheath current signal are collected, the temperature detection unit and the grounding current detection unit collect the cable surface temperature and the grounding current through the cable surface temperature sensor and the current sensor, and transmitting the signal to an intelligent cable insulation monitoring edge device through analog-to-digital conversion.
The invention also discloses a medium-voltage cable state online monitoring system, which comprises a cable insulation state online monitoring device, a cable insulation monitoring edge intelligent device and a cable insulation state monitoring system, wherein the cable insulation state online monitoring device comprises a broadband impedance spectrum detection unit, a partial discharge detection unit, a cable temperature detection unit, a grounding current detection unit and a communication interface, the broadband impedance spectrum detection unit, the partial discharge detection unit, the cable temperature detection unit and the grounding current detection unit are respectively connected to the cable insulation monitoring edge intelligent device through the communication interface, the cable insulation monitoring edge intelligent device receives data collected by all the units and carries out edge calculation analysis to judge the cable insulation state, the cable insulation monitoring edge intelligent device is connected with the cable insulation state monitoring system, and the cable insulation state monitoring system receives the calculation result and data of the cable insulation monitoring edge intelligent device and carries out re-judgment and result display of the cable insulation state.
Furthermore, the broadband impedance spectrum detection unit comprises a signal generator and a signal collector, wherein the input side of the signal generator is connected with the cable insulation monitoring edge intelligent device, the output side of the signal generator is connected with the cable and the signal collector, the signal collector collects impedance spectrum signals through a broadband impedance spectrum signal coupling sensor, the broadband impedance spectrum signal coupling sensor comprises a film capacitor, a filter, a capacitor and an inductor, wherein the film capacitor is wrapped on an elbow-shaped head of the switch cabinet and then leads out a connecting wire to be grounded, the filter is connected between the film capacitor and a grounding terminal, the impedance spectrum and temperature measurement signals are injected and collected through the filter, and the capacitor and the inductor are connected between a cable sheath and the grounding terminal in series.
Further, the communication interface includes 2 1000M network ports, 2 1000M optical ports, 2 RS485 ports and 1 USB interface.
The invention has the beneficial effects that: the device for monitoring the medium-voltage cable in real time based on the impedance spectrum, the partial discharge, the grounding current and the cable temperature has the advantages that the broadband impedance sensor is wound on the cable, the current sensor and the temperature sensor are directly connected with the cable, the medium-voltage cable can be monitored in a nondestructive and online manner, the technologies of internet of things sensing, edge calculation and the like are applied to the state monitoring of the medium-voltage cable in the city, the comprehensiveness of the state monitoring of the medium-voltage cable, the accuracy of the state and fault identification of the cable are improved, the economy of a monitoring system is improved, the running fault of the cable is reduced, the safe and reliable running of the cable line is guaranteed, and the research, development and application of the medium-voltage power cable state online monitoring system are realized.
Drawings
FIG. 1 is a flow chart of a cable insulation state monitoring method;
FIG. 2 is a schematic diagram of a broadband impedance spectroscopy sensor installation and signal coupling injection method;
FIG. 3 is a flow chart of cable insulation state analysis and determination;
FIG. 4 is a diagram of the overall structure of the cable insulation state on-line monitoring system;
FIG. 5 is a schematic view of the cable insulation state on-line a functional architecture diagram of a monitoring device.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Practice of example 1
The embodiment discloses an online monitoring method for the state of a medium-voltage cable, as shown in fig. 1, comprising the following steps:
s01), arranging the cable insulation state on-line monitoring device at a corresponding position for signal acquisition, wherein the cable insulation state on-line monitoring device comprises a broadband impedance spectrum detection unit, a grounding current detection unit, an partial discharge detection unit and a cable temperature detection unit, the broadband impedance spectrum detection unit is installed on an elbow-shaped head of a switch cabinet, the grounding current detection unit is installed on a grounding wire, and the partial discharge detection unit and the cable temperature detection unit are installed on an insulation connector and are respectively used for acquiring an impedance spectrum signal, grounding current, a partial discharge signal and cable temperature of the installation position.
S02) setting communication parameters of the cable insulation state on-line monitoring device, calibrating grounding current and cable surface temperature measurement, determining a calibration coefficient and storing the calibration coefficient.
S03), the cable insulation state on-line monitoring device collects broadband impedance spectrum, partial discharge, grounding current and temperature data and transmits the data to the cable insulation monitoring edge intelligent device;
s04), the intelligent cable insulation monitoring edge device performs edge analysis and calculation on the broadband impedance spectrum, the partial discharge, the grounding current and the temperature data; the analysis process is shown in fig. 3:
respectively monitoring the head and tail ends of the tested cable and impedance parameters with different lengths aiming at the broadband impedance spectrum signal, and judging whether the head and tail ends of the tested cable have short circuit and open circuit or not and whether the impedance parameters with different lengths of the tested cable are abnormal or not by combining a model of the tested cable in a threshold comparison mode;
monitoring partial discharge capacity, discharge frequency and discharge phase of cables in different phases aiming at partial discharge signals, and judging discharge types;
judging and analyzing the temperature abnormality of the cable according to a threshold value aiming at the temperature signal of the cable;
analyzing the grounding current abnormity by processing the ring ratio increase rate and the maximum/minimum value aiming at the grounding current signals;
if the above criterion is abnormal twice or more than two criteria are abnormal, the insulation state of the output cable is abnormal.
S05), transmitting an analysis result of the intelligent cable insulation monitoring edge device to an online cable insulation state monitoring system, and gathering analysis data of the intelligent cable insulation monitoring edge device by the online cable insulation state monitoring system to display and alarm the data. Specifically, after receiving data of the intelligent cable insulation monitoring edge device, the cable insulation state monitoring system forms a temperature-time curve, a grounding current-time curve, an impedance-length curve and a partial discharge monitoring data spectrogram, and performs cable insulation state alarm by combining analysis conditions of the intelligent cable insulation monitoring edge device.
In order to realize the nondestructive monitoring of the insulation state of the cable and the injection of the impedance spectrum signal, as shown in fig. 2 and 4, the broadband impedance spectrum detection unit comprises a signal generator and a signal collector, the input side of the signal generator is connected with the intelligent device at the insulation monitoring edge of the cable, the output side of the signal generator is connected with the cable and the signal collector, the signal collector collects the impedance spectrum signal through a broadband impedance spectrum signal coupling sensor, the broadband impedance spectrum signal coupling sensor comprises a thin film capacitor C, a filter D1, a capacitor C1 and an inductor L1, the thin film capacitor C is wrapped on an elbow-shaped head of the switch cabinet and then leads out a connecting wire to be grounded, the filter D1 is connected between the thin film capacitor C and a grounding end GND1, the injection and the collection of the impedance spectrum and the temperature measurement signal are carried out through the filter D1, and the capacitor C1 and the inductor L1 are connected in series between a cable sheath and the grounding end GND 1.
In this embodiment, the acquisition process of each data is as follows:
when the broadband impedance spectrum signal is collected, the impedance spectrum detection unit is matched with the signal channel switching module, 3 phases are divided to perform time-sharing injection and reflection signal collection of the impedance spectrum detection signal, and the impedance conditions of different lengths of the monitoring cable are disclosed as follows to form a complete broadband impedance spectrogram of the detected cable.
When cable partial discharge signals are collected, the cable partial discharge detection unit collects partial discharge signals through the high-frequency current sensor and forms PRPD and PRPS data which serve as a basis for judging discharge capacity.
When the cable temperature and the sheath current signal are collected, the temperature detection unit and the grounding current detection unit collect the cable surface temperature and the grounding current through the cable surface temperature sensor and the current sensor, and the cable surface temperature and the grounding current are transmitted to the intelligent cable insulation monitoring edge device through analog-to-digital conversion.
Example 2
The embodiment discloses a medium-voltage cable state online monitoring system, as shown in fig. 4, which includes a cable insulation state online monitoring device, a cable insulation monitoring edge intelligent device and a cable insulation state monitoring system.
The cable insulation state on-line monitoring device comprises 3 paths of wide-frequency impedance spectrum detection units, 4 paths of local discharge detection units, 2 paths of cable temperature detection units, 1 path of grounding current detection unit and a communication interface, the wide-frequency impedance spectrum detection unit, the local discharge detection unit, the cable temperature detection unit and the grounding current detection unit are respectively connected to the cable insulation monitoring edge intelligent device through the communication interface, the cable insulation monitoring edge intelligent device receives data collected by all the units and carries out edge calculation analysis to judge the cable insulation state, the cable insulation monitoring edge intelligent device is connected with the cable insulation state monitoring system, the cable insulation state monitoring system receives calculation results and data of the cable insulation monitoring edge intelligent device and carries out secondary judgment and result display of the cable insulation state.
The collection process of the cable insulation state online monitoring device, the analysis process of the cable insulation monitoring edge intelligent device and the display process of the cable insulation state monitoring system are the same as those in embodiment 1, and are not described again.
With reference to fig. 2 and 4, the broadband impedance spectrum detection unit includes a signal generator and a signal collector, an input side of the signal generator is connected to the cable insulation monitoring edge intelligent device, an output side of the signal generator is connected to the cable and the signal collector, the signal collector collects impedance spectrum signals through a broadband impedance spectrum signal coupling sensor, the broadband impedance spectrum signal coupling sensor includes a thin film capacitor, a filter, a capacitor and an inductor, the thin film capacitor is wrapped on an elbow-shaped head of the switch cabinet and then a connection line is led out to be grounded, the filter is connected between the thin film capacitor and a ground terminal, the impedance spectrum and temperature measurement signals are injected and collected through the filter, and the capacitor and the inductor are connected in series between a cable sheath and the ground terminal.
In this embodiment, the communication interface includes 2 1000M network ports, 2 1000M optical ports, 2 RS485 ports and 1 USB interface. As shown in fig. 5, the frequency impedance spectrum detection unit, the partial discharge detection unit, the cable temperature detection unit, and the ground current detection unit are respectively connected to the intelligent cable insulation monitoring edge device through the communication interface, so as to transmit data and instructions.
The foregoing description is only for the purpose of illustrating the general principles and preferred embodiments of the present invention, and it is intended that modifications and substitutions be made by those skilled in the art in light of the present invention and that they fall within the scope of the present invention.
Claims (9)
1. A medium voltage cable state on-line monitoring method is characterized in that: the method comprises the following steps:
s01), arranging a cable insulation state on-line monitoring device at a corresponding position for signal acquisition, wherein the cable insulation state on-line monitoring device comprises a broadband impedance spectrum detection unit, a grounding current detection unit, an partial discharge detection unit and a cable temperature detection unit, the broadband impedance spectrum detection unit is installed on an elbow-shaped head of a switch cabinet, the grounding current detection unit is installed on a grounding wire, and the partial discharge detection unit and the cable temperature detection unit are installed on an insulation connector and are respectively used for acquiring an impedance spectrum signal, grounding current, a partial discharge signal and cable temperature at the installation position;
s02), setting communication parameters of the cable insulation state online monitoring device, calibrating grounding current and cable surface temperature measurement, determining and storing a calibration coefficient;
s03), acquiring broadband impedance spectrum, partial discharge, grounding current and temperature data by the cable insulation state online monitoring device, and transmitting the data to the cable insulation monitoring edge intelligent device;
s04), the intelligent cable insulation monitoring edge device performs edge analysis and calculation on the broadband impedance spectrum, the partial discharge, the grounding current and the temperature data;
aiming at the broadband impedance spectrum signal, respectively monitoring the head and tail ends of the tested cable and impedance parameters with different lengths, and judging whether the head and tail ends of the tested cable have short circuit and open circuit or not and whether the impedance parameters with different lengths of the tested cable are abnormal or not by combining a model of the tested cable and a threshold value comparison mode;
monitoring partial discharge capacity, discharge frequency and discharge phase of cables in different phases aiming at partial discharge signals, and judging discharge types;
judging and analyzing the temperature abnormality of the cable according to a threshold value aiming at the temperature signal of the cable;
analyzing the grounding current abnormity by processing the ring ratio increase rate and the maximum value/the minimum value aiming at the grounding current signal;
if the certain criterion is abnormal twice or more than two criteria are abnormal, the insulation state of the output cable is abnormal;
s05), transmitting an analysis result of the intelligent cable insulation monitoring edge device to an online cable insulation state monitoring system, and gathering analysis data of the intelligent cable insulation monitoring edge device by the online cable insulation state monitoring system to display and alarm the data.
2. The on-line monitoring method for the state of the medium-voltage cable according to claim 1, characterized in that: in order to realize the nondestructive monitoring of the insulation state of the cable and the injection of impedance spectrum signals, the broadband impedance spectrum detection unit comprises a signal generator and a signal collector, the input side of the signal generator is connected with the intelligent device at the insulation monitoring edge of the cable, the output side of the signal generator is connected with the cable and the signal collector, the signal collector collects impedance spectrum signals through a broadband impedance spectrum signal coupling sensor, the broadband impedance spectrum signal coupling sensor comprises a film capacitor, a filter, a capacitor and an inductor, the film capacitor is wrapped on an elbow-shaped head of a switch cabinet and then leads out a connecting wire to be grounded, the filter is connected between the film capacitor and a grounding terminal, the injection and collection of impedance spectrum and temperature measurement signals are carried out through the filter, and the capacitor and the inductor are connected between a cable sheath and the grounding terminal in series.
3. The on-line monitoring method for the condition of the medium voltage cable according to claim 1, characterized in that: after receiving the data of the intelligent cable insulation monitoring edge device, the cable insulation state monitoring system forms a temperature-time curve, a grounding current-time curve, an impedance-length curve and a partial discharge monitoring data spectrogram, and performs cable insulation state alarm by combining the analysis condition of the intelligent cable insulation monitoring edge device.
4. The on-line monitoring method for the condition of the medium voltage cable according to claim 1, characterized in that: when the broadband impedance spectrum signal is collected, the impedance spectrum detection unit is matched with the signal channel switching module, 3 phases are divided to perform time-sharing injection and reflection signal collection of the impedance spectrum detection signal, the impedance conditions of different lengths of the cable are monitored, and a complete broadband impedance spectrum of the tested cable is formed.
5. The on-line monitoring method for the condition of the medium voltage cable according to claim 1, characterized in that: when cable partial discharge signals are collected, the cable partial discharge detection unit collects partial discharge signals through the high-frequency current sensor and forms PRPD and PRPS data which are used as a basis for judging discharge capacity.
6. The on-line monitoring method for the condition of the medium voltage cable according to claim 1, characterized in that: when the cable temperature and the sheath current signal are collected, the temperature detection unit and the grounding current detection unit collect the cable surface temperature and the grounding current through the cable surface temperature sensor and the current sensor, and the cable surface temperature and the grounding current are transmitted to the intelligent cable insulation monitoring edge device through analog-to-digital conversion.
7. The utility model provides a medium voltage cable state on-line monitoring system which characterized in that: the cable insulation state online monitoring device comprises a broadband impedance spectrum detection unit, a partial discharge detection unit, a cable temperature detection unit, a ground current detection unit and a communication interface, wherein the broadband impedance spectrum detection unit, the partial discharge detection unit, the cable temperature detection unit and the communication interface are connected to the cable insulation monitoring edge intelligent device through the communication interface respectively, the cable insulation monitoring edge intelligent device receives data collected by each unit and carries out edge calculation analysis to judge the cable insulation state, the cable insulation monitoring edge intelligent device is connected with the cable insulation state monitoring system, and the cable insulation state monitoring system receives calculation results and data of the cable insulation monitoring edge intelligent device and carries out secondary judgment and result display of the cable insulation state.
8. The medium voltage cable condition on-line monitoring system according to claim 7, wherein: the broadband impedance spectrum detection unit comprises a signal generator and a signal collector, wherein the input side of the signal generator is connected with the intelligent cable insulation monitoring edge device, the output side of the signal generator is connected with a cable and the signal collector, the signal collector collects impedance spectrum signals through a broadband impedance spectrum signal coupling sensor, the broadband impedance spectrum signal coupling sensor comprises a film capacitor, a filter, a capacitor and an inductor, the film capacitor is wrapped on an elbow-shaped head of a switch cabinet and then is led out to be connected with the ground, the filter is connected between the film capacitor and a grounding terminal, the impedance spectrum and temperature measurement signals are injected and collected through the filter, and the capacitor and the inductor are connected between a cable sheath and the grounding terminal in series.
9. The medium voltage cable condition on-line monitoring system according to claim 7, wherein: the communication interface comprises 2 1000M network ports, 2 1000M optical ports, 2 paths of RS485 ports and 1 path of USB interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211207168.0A CN115575777A (en) | 2022-09-30 | 2022-09-30 | Medium-voltage cable state online monitoring method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211207168.0A CN115575777A (en) | 2022-09-30 | 2022-09-30 | Medium-voltage cable state online monitoring method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115575777A true CN115575777A (en) | 2023-01-06 |
Family
ID=84582312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211207168.0A Pending CN115575777A (en) | 2022-09-30 | 2022-09-30 | Medium-voltage cable state online monitoring method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115575777A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115954725A (en) * | 2023-02-22 | 2023-04-11 | 苏州埃博斯电气有限公司 | Automobile circuit connector with communication abnormity monitoring function |
| CN117686783A (en) * | 2023-12-12 | 2024-03-12 | 武汉朗德电气有限公司 | High-voltage cable grounding current on-line monitoring device based on load dynamic management |
-
2022
- 2022-09-30 CN CN202211207168.0A patent/CN115575777A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115954725A (en) * | 2023-02-22 | 2023-04-11 | 苏州埃博斯电气有限公司 | Automobile circuit connector with communication abnormity monitoring function |
| CN115954725B (en) * | 2023-02-22 | 2023-09-26 | 苏州埃博斯电气有限公司 | Automobile circuit connector with communication abnormality monitoring function |
| CN117686783A (en) * | 2023-12-12 | 2024-03-12 | 武汉朗德电气有限公司 | High-voltage cable grounding current on-line monitoring device based on load dynamic management |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115575777A (en) | Medium-voltage cable state online monitoring method and system | |
| US9390067B2 (en) | Method for the continuous monitoring and diagnosis of sources of partial discharges (PDs) in high voltage cables during connection to, and operation in the power grid, and physical system for carrying out same | |
| CN207123591U (en) | On-line monitoring system for high-tension cable partial discharge and fault location | |
| CN106771922B (en) | A kind of high-tension electricity system of detecting partial discharge in equipment and Recognition of Partial Discharge | |
| CN106771933A (en) | Power cable shelf depreciation high frequency electric monitoring system based on wireless network | |
| CN106124939A (en) | Distributed high tension cable partial discharge monitoring and alignment system | |
| CN112202493A (en) | Fault detection method, device and system for communication line | |
| CN103675623A (en) | Method and system for detecting partial discharging of GIS under impulse voltage | |
| CN111238573A (en) | Optical fiber type multi-parameter cable terminal detection system | |
| CN112067946A (en) | Cable sheath fault monitoring device and method for broadcasting synchronous signals by multiple Rogowski coils | |
| CN113985223A (en) | Multi-parameter intelligent identification system of high-voltage dry-type sleeve and application | |
| CN108490329A (en) | Power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus and monitoring method | |
| CN105911443A (en) | Online measurement system for partial discharge of cable middle joint based on clamp-shaped coaxial capacitor | |
| CN112363017A (en) | Line fault positioning method based on wavelet transformation | |
| CN116125196A (en) | High-voltage cable fault traveling wave ranging system and method | |
| CN113805007A (en) | High-voltage cable health state online monitoring system and monitoring method thereof | |
| CN202351373U (en) | Power cable fault traveling wave distance measuring equipment | |
| CN213213470U (en) | Fault detection system for communication line | |
| CN116930684A (en) | System and method for monitoring state of seabed high-voltage cable of offshore wind farm | |
| CN103364695A (en) | Local discharging on-line monitoring device of high-voltage cable | |
| CN106066444A (en) | Ground fault detection device and method based on capacitance partial pressure and big data analysis | |
| CN102495334B (en) | Multitrace traveling wave distance measurement method for power cable faults | |
| CN205691705U (en) | A kind of ground fault detection device based on capacitance partial pressure | |
| CN211061633U (en) | Direct current insulation monitoring device based on alternating current and direct current leakage current sensor | |
| CN112684293A (en) | Power distribution system insulation fault diagnosis device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |