CN112782540A - High-voltage cable on-line monitoring and fault point positioning device - Google Patents
High-voltage cable on-line monitoring and fault point positioning device Download PDFInfo
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- CN112782540A CN112782540A CN202011601070.4A CN202011601070A CN112782540A CN 112782540 A CN112782540 A CN 112782540A CN 202011601070 A CN202011601070 A CN 202011601070A CN 112782540 A CN112782540 A CN 112782540A
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
A high-voltage cable on-line monitoring and fault point locating device is characterized in that a signal application circuit of the device comprises a high-frequency current sensor and a low-frequency current sensor, analog signals output by the two current sensors are transmitted to a signal filtering circuit to be filtered, the filtered signals are transmitted to an A/D conversion circuit to be subjected to digital signal conversion, the converted digital signals are transmitted to a microprocessor circuit to be subjected to data analysis and storage and are transmitted to a wireless data communication circuit, and the wireless data communication circuit transmits data to a background server and a mobile terminal. The high-frequency current sensor and the low-frequency current sensor are sleeved on a sheath grounding wire of the measured high-voltage cable, and the high-frequency current sensor is also provided with a functional circuit for detecting higher harmonic energy. The invention has the beneficial effects that: the device can monitor the insulation partial discharge and fault state of the cable at the moment of starting the load of the high-voltage cable, and overcomes the defect that the first waveform of the device at the moment of power supply cannot be monitored.
Description
Technical Field
The invention relates to the technical field of high-voltage cable monitoring, in particular to a device for judging the fault of a high-voltage cable and positioning a fault point of the high-voltage cable by utilizing a grounding current waveform.
Background
In the prior art, a single core cable is mostly used for 110kV and above ultra-high voltage cables, and when the ultra-high voltage cable runs, an induced voltage is generated on an aluminum sheath to avoid a circulating current generated on the aluminum sheath, so that when the ultra-high voltage cable is laid, the aluminum sheath generally adopts a mode of one end being directly grounded, one end being protected and grounded or a cross-connection mode. The detection and fault location of the high-voltage cable mainly refer to the insulation detection of the high-voltage cable and the location of a fault point by using a technical means when the high-voltage cable has a fault. Wherein: the insulation detection of the high-voltage cable comprises the following steps: at present, the high-voltage cable detection mainly adopts an off-line voltage-resistant testing technology and an on-line temperature measuring technology of a running cable. The off-line detection technology has the defects that power failure detection is needed, and the running condition of the cable cannot be monitored in real time. The cable on-line temperature measurement technology has the defects that the temperature is greatly influenced by the ambient temperature, and the false alarm fault often occurs. (II) high-voltage cable fault positioning: the current ultrahigh voltage cable sheath fault positioning device mainly comprises an acoustic magnetic synchronization method, a step voltage method and an acoustic measurement method. The acousto-magnetic synchronization method and the acoustic measurement method are mainly used for fixing the point of a fault with large fault resistance, and for a fault with small fault resistance, the acousto-magnetic synchronization method and the acoustic measurement method cannot be used for fixing the point generally due to small discharge sound. The step voltage method is generally suitable for fault location of a direct-buried cable, but most of ultrahigh voltage cables are laid through a cable trench or a cable tunnel, so that location cannot be performed by using step voltage.
Disclosure of Invention
The invention provides a method for calculating fault degree and fault position by using the waveforms of cable sheath grounding current and fault grounding current of a high-voltage cable in the operation process, which can effectively monitor cable faults and search fault points of the cable.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-voltage cable on-line monitoring and fault point positioning device is characterized in that the signal application circuit comprises a high-frequency current sensor and a low-frequency current sensor, analog signals output by the two current sensors are transmitted to a signal filter circuit for filtering, the filtered signals are transmitted to an A/D conversion circuit for digital signal conversion, the converted digital signals are transmitted to the microprocessor circuit for data analysis and storage and are transmitted to a wireless data communication circuit, and the wireless data communication circuit transmits the data to a background server and a mobile terminal.
The high-frequency current sensor and the low-frequency current sensor are arranged on a sheath grounding wire of the high-voltage cable to be measured, so that the sheath grounding wire of the high-voltage cable penetrates through coils of the high-frequency current sensor and the low-frequency current sensor, and the coil output ends of the high-frequency current sensor and the low-frequency current sensor are respectively connected to a high-frequency signal acquisition end and a low-frequency signal acquisition end of the device.
The high-frequency current sensor is provided with a high-pass filter circuit so as to prevent the phenomenon that the high-voltage cable blocks the current sensor due to overlarge induced current in a cable sheath caused by load starting, and the high-frequency current is reserved for monitoring cable faults at the moment of starting the high-voltage cable.
The high-frequency current sensor is also provided with a functional circuit for detecting the energy of the higher harmonic wave, and an induced current of the higher harmonic wave of the power grid in a high-voltage cable sheath is filtered by using an energy threshold of the high-frequency current sensor, so that a signal transmitted to a later stage is a real fault signal waveform of the insulation partial discharge of the high-voltage cable.
The wireless data communication circuit comprises a BDS (Beidou satellite positioning system) module circuit and a 5G mobile communication module circuit.
Compared with the prior art, the invention has the beneficial effects that:
according to the high-voltage cable on-line monitoring and fault point positioning device, the self-developed current sensor with the high-pass filter circuit is adopted in the signal sampling circuit, so that the insulation partial discharge and fault state of the high-voltage cable can be monitored at the moment of starting the load of the high-voltage cable, and the defect that the first waveform of the partial discharge of the high-voltage cable at the moment of supplying power cannot be monitored is overcome; meanwhile, the comprehensive treatment of the low-frequency current amplitude and the high-frequency current waveform energy of the protective layer of the high-voltage cable prevents the device from misreporting the insulation fault of the high-voltage cable, and the Beidou satellite positioning system is utilized, so that the fault of the high-voltage cable is more accurately positioned, the reliability of transmitting background data to the device in field operation is ensured, and the accuracy of the insulation fault positioning of the high-voltage cable is ensured.
Drawings
Fig. 1 is a schematic view of the working principle of the high-voltage cable on-line monitoring and fault point locating device of the invention.
Fig. 2 is a schematic structural diagram of the on-line monitoring and fault point locating device for the high-voltage cable.
Fig. 3 is a schematic diagram of a panel structure of the device.
Fig. 4 is a schematic diagram of the external structure of the high-frequency current sensor.
Fig. 5 is a schematic diagram of the external structure of the low-frequency current sensor.
FIG. 6 is a schematic diagram of the distance measurement principle of the fault discharge waveform.
Fig. 7 is a work flow diagram of the high voltage cable on-line monitoring and fault point locating device.
Fig. 8 is a schematic diagram of a high frequency filter circuit.
FIG. 9 is a schematic circuit diagram of a liquid crystal display panel.
Fig. 10 is a schematic circuit diagram of the microprocessor circuit of the device.
Detailed Description
The specific structure of the high-voltage cable on-line monitoring and fault point locating device of the present invention is further described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of the working principle of the high-voltage cable on-line monitoring and fault point locating device of the invention. The high-frequency current sensor and the low-frequency current sensor of the device are arranged on a sheath grounding wire of the high-voltage cable to be measured, so that the sheath grounding wire of the high-voltage cable penetrates through coils of the high-frequency current sensor and the low-frequency current sensor, the coil output ends of the high-frequency current sensor and the low-frequency current sensor are respectively connected to a high-frequency signal acquisition end and a low-frequency signal acquisition end of the device, a power supply circuit of the device is connected, and the device can work.
Fig. 2 and 3 are schematic diagrams illustrating a structure of the on-line monitoring and fault point locating device for high-voltage cables.
The high-voltage cable on-line monitoring and fault point positioning device is characterized in that the signal application circuit comprises a high-frequency current sensor and a low-frequency current sensor, analog signals output by the two current sensors are transmitted to a signal filter circuit for filtering, the filtered signals are transmitted to an A/D conversion circuit for digital signal conversion, the converted digital signals are transmitted to the microprocessor circuit for data analysis and storage and are transmitted to a wireless data communication circuit, and the wireless data communication circuit transmits the data to a background server and a mobile terminal.
The high-frequency current sensor and the low-frequency current sensor are arranged on a sheath grounding wire of the high-voltage cable to be measured, so that the sheath grounding wire of the high-voltage cable penetrates through coils of the high-frequency current sensor and the low-frequency current sensor, and the coil output ends of the high-frequency current sensor and the low-frequency current sensor are respectively connected to a high-frequency signal acquisition end and a low-frequency signal acquisition end of the device.
The high-frequency current sensor is provided with a high-pass filter circuit so as to prevent the phenomenon that the high-voltage cable blocks the current sensor due to overlarge induced current in a cable sheath caused by load starting, and the high-frequency current is reserved for monitoring cable faults at the moment of starting the high-voltage cable.
The high-frequency current sensor is also provided with a functional circuit for detecting the energy of the higher harmonic wave, and an induced current of the higher harmonic wave of the power grid in a high-voltage cable sheath is filtered by using an energy threshold of the high-frequency current sensor, so that a signal transmitted to a later stage is a real fault signal waveform of the insulation partial discharge of the high-voltage cable.
The wireless data communication circuit comprises a BDS (Beidou satellite positioning system) module circuit and a 5G mobile communication module circuit.
As shown in fig. 4 and 5, the device uses an autonomously developed load start-up surge current resistant linear unsaturated current sensor, and is characterized in that when a load at a high-voltage cable load end is put into operation, the current in a cable sheath is instantly increased, the large current enters an acquisition terminal and is mistakenly regarded as fault current, and a cable fault is mistakenly reported.
The high-frequency current sensor is characterized by having the function of detecting the energy of higher harmonics, and filtering induced current of the higher harmonics of a power grid in a high-voltage cable sheath by using an energy threshold of the high-frequency current sensor to achieve the aim of removing the false and storing the true, so that the signal transmitted to the acquisition terminal by the high-frequency current sensor is the true insulation partial discharge and fault signal waveform of the high-voltage cable.
As shown in fig. 6, the high-voltage cable fault point positioning calculation of the present device adopts the traveling wave positioning principle, that is, the relationship between the propagation reflection time difference and the propagation velocity of the fault current waveform between the fault point of the cable and the starting point of the cable is utilized to determine the distance X between the fault point and the starting point of the cable as follows:
X＝L-1/2V(t2-t1)
in the formula: l is the length of the cable, V is the propagation velocity of the current in the cable insulation, the value of which is determined by the material of the cable core, t2-t1Is the difference in propagation time of the current waveform at the start of the cable and the point of failure.
In actual work, because the fault traveling wave of the high-voltage cable is repeatedly reflected and oscillated in the high-voltage cable, the device can obtain a plurality of complete traveling wave reflection waveforms, and therefore the measured fault position adopts a weighted average number so as to improve the accuracy of fault positioning.
Fig. 7 is a block diagram of a work flow of the device for online monitoring and fault point locating of a high voltage cable. The working principle of the high-voltage cable on-line monitoring and fault point positioning device is that a cable grounding current and fault current waveforms are collected through a sensor, the cable grounding current and fault current waveforms are sent to a harmonic detection and filtering circuit, signals obtained after harmonic filtering are sent to a fault wave collecting circuit to carry out fault waveform reduction and collection, then fault waveforms are digitized and sent to a computing center circuit to be computed, and the cable fault degree and fault positions are obtained.
The device can also utilize the wireless data communication circuit to communicate with the Beidou satellite, and fault current waveforms of the high-voltage cable are transmitted to the background server to process and calculate data. The Beidou signal transmission is utilized to assist in high-precision positioning of high-voltage cable faults, and high-precision positioning of the high-voltage cable faults and real-time monitoring of cable insulation are guaranteed.
The mobile 5G signal or the Beidou satellite signal is used for communicating with an upper computer and management personnel, and the communication without dead angles in the field is achieved.
Data analysis and use. Judging the insulation health condition of the cable by removing the low-frequency current of the high-voltage cable sheath; reflecting the partial discharge condition of the high-voltage cable by using a high-frequency sensor; the high-voltage cable insulation fault early warning value and the fault recording starting signal are comprehensively determined by using the amplitude detected by the low-frequency current sensor and the discharge waveform energy detected by the high-frequency sensor, so that the fault of the high-voltage cable is not mistakenly reported.
Fig. 8 is a schematic diagram of a high frequency filter circuit, and fig. 9 is a schematic circuit diagram of a liquid crystal panel display and driving circuit. Fig. 10 is a schematic circuit diagram of the microprocessor circuit of the device. The circuits shown in the three figures are prior art, and many data are introduced and analyzed, which are not described herein again.
The positioning device has the characteristics of high-speed wave recording and cable fault positioning and calculating functions and can adapt to the field operation environment. When the high-voltage cable is operated in the field, the BDS (Beidou satellite positioning system) signal transmission is utilized to assist high-voltage cable fault high-precision positioning, and mobile 5G signals or Beidou satellite signals are utilized to communicate with an upper computer and management personnel. The high-speed wave recording function means that a current acquisition sensor on a grounding wire of the high-voltage cable sheath can acquire signals in real time and transmit the acquired signals to an input circuit of the device in time, and the independently designed current signal acquisition circuit can transmit the current signals to a data processing center through analog-to-digital conversion at high speed, completely and accurately, and after calculation by the data processing center, the current waveform and the fault position of the high-voltage cable sheath are displayed on a display screen.
Compared with the prior art, the invention has the beneficial effects that:
according to the high-voltage cable on-line monitoring and fault point positioning device, the self-developed current sensor with the high-pass filter circuit is adopted in the signal sampling circuit, so that the insulation partial discharge and fault state of the high-voltage cable can be monitored at the moment of starting the load of the high-voltage cable, and the defect that the first waveform of the partial discharge of the high-voltage cable at the moment of supplying power cannot be monitored is overcome; meanwhile, the comprehensive treatment of the low-frequency current amplitude and the high-frequency current waveform energy of the protective layer of the high-voltage cable prevents the device from misreporting the insulation fault of the high-voltage cable, and the Beidou satellite positioning system is utilized, so that the fault of the high-voltage cable is more accurately positioned, the reliability of transmitting background data to the device in field operation is ensured, and the accuracy of the insulation fault positioning of the high-voltage cable is ensured.
Claims (5)
1. The high-voltage cable on-line monitoring and fault point positioning device is characterized in that the signal application circuit comprises a high-frequency current sensor and a low-frequency current sensor, analog signals output by the two current sensors are transmitted to a signal filter circuit for filtering, the filtered signals are transmitted to an A/D conversion circuit for digital signal conversion, the converted digital signals are transmitted to the microprocessor circuit for data analysis and storage and are transmitted to a wireless data communication circuit, and the wireless data communication circuit transmits the data to a background server and a mobile terminal.
2. The device as claimed in claim 1, wherein the high frequency current sensor and the low frequency current sensor are disposed on a sheath ground wire of the high voltage cable to be tested, so that the sheath ground wire of the high voltage cable passes through the coils of the high frequency current sensor and the low frequency current sensor, and the coil output ends of the high frequency current sensor and the low frequency current sensor are respectively connected to the high frequency signal acquisition end and the low frequency signal acquisition end of the device.
3. The apparatus as claimed in claim 2, wherein the high frequency current sensor has a high pass filter circuit to prevent the current sensor from being blocked due to excessive induced current in the cable sheath caused by the start of the high voltage cable when the load is started, and to retain the high frequency current for monitoring the cable fault at the start moment of the high voltage cable.
4. The device as claimed in claim 2, wherein the high frequency current sensor further comprises a functional circuit for detecting the energy of the higher harmonics, and the energy threshold is used to filter the induced current of the higher harmonics in the sheath of the high voltage cable, so that the signal transmitted to the subsequent stage is the real fault signal waveform of the insulation partial discharge of the high voltage cable.
5. The on-line monitoring and fault point locating device of claim 1, wherein the wireless data communication circuit comprises a BDS Beidou satellite positioning system module circuit and a 5G mobile communication module circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011601070.4A CN112782540A (en) | 2020-12-29 | 2020-12-29 | High-voltage cable on-line monitoring and fault point positioning device |
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| CN202011601070.4A CN112782540A (en) | 2020-12-29 | 2020-12-29 | High-voltage cable on-line monitoring and fault point positioning device |
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| CN114743353A (en) * | 2022-03-23 | 2022-07-12 | 康威通信技术股份有限公司 | High-voltage rubber jacketed flexible cable fault positioning early warning system and method based on clock synchronization |
| CN115277465A (en) * | 2022-05-13 | 2022-11-01 | 国网福建省电力有限公司 | Multi-frequency self-healing cable running state monitoring device and method |
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Application publication date: 20210511 |
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