CN116679177A - Cable joint partial discharge on-line monitoring device and method and power system - Google Patents
Cable joint partial discharge on-line monitoring device and method and power system Download PDFInfo
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- CN116679177A CN116679177A CN202310864254.7A CN202310864254A CN116679177A CN 116679177 A CN116679177 A CN 116679177A CN 202310864254 A CN202310864254 A CN 202310864254A CN 116679177 A CN116679177 A CN 116679177A
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Classifications
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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
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses an online monitoring device and method for partial discharge of a cable joint and a power system. The device comprises: the system comprises a remote terminal, a data acquisition terminal, a sensor and a cable joint to be monitored; the cable joint to be monitored is connected with the sensor in an electromagnetic coupling way, the sensor is electrically connected with the data acquisition terminal, and the data acquisition terminal is in communication connection with the remote terminal; the sensor is used for collecting current signals in the cable joint to be monitored; the data acquisition terminal processes the received current signal, and converts the current signal into a digital signal after amplification and filtering, and the digital signal is fed back to the remote terminal; and the remote terminal performs partial discharge feature extraction, pattern recognition and insulation evaluation on the digital signal, judges whether to send out an alarm signal according to the diagnosis result, and generates an operation and maintenance result of the cable joint to be monitored. The invention realizes the real-time monitoring and early warning of the partial discharge of the cable joint, performs fault diagnosis and defect type identification on the cable joint, and can improve the reliability and safety of the operation of the power cable.
Description
Technical Field
The invention relates to the technical field of cable connector discharge detection and diagnosis, in particular to a cable connector partial discharge on-line monitoring device and method and a power system.
Background
Along with the acceleration of the urban process, the power consumption load of the power grid is continuously increased, and the power cable is greatly put into use for transmission and distribution networks due to the excellent performance. Along with the continuous extension of the cable line, the usage amount of the cable joint is gradually increased, and the structure of the cable joint is formed by multi-layer closed solid composite medium insulation, so that the insulation performance of the cable joint is easily influenced in multiple aspects, the safety margin is smaller, various defects possibly occur in the production, manufacturing and using processes of the cable joint, and the cable joint is easier to break down than the cable body and is a weak link of the cable. Under the action of high voltage, the electric field around the defect position is distorted, and then partial discharge phenomenon is easy to generate. The long-term existence of partial discharge can lead to continuous degradation of the insulation performance of the cable joint, and the severe insulation breakdown can be caused. Therefore, the initial partial discharge phenomenon of the cable joint is detected, and the discharge type of the defect is timely judged, so that the safe and stable operation of the power system is ensured.
Currently, research in this area has the following difficulties: 1. the method of the cable joint mostly adopts a simulation sample for manufacturing the cable joint, and the partial discharge process in the cable joint is analyzed by using the sample. In fact, such samples do not accurately restore the actual working cable joint, and therefore the partial discharge information obtained is not sufficiently accurate. In addition, the difference of partial discharge information reflected in different stages of joint insulation is also large, and it is difficult to accurately evaluate the partial discharge condition and evaluate the degree of insulation degradation of the cable joint in real time. 2. The existing cable joint partial discharge on-line monitoring method has the defects of different degrees in sensitivity, monitoring frequency band and noise resistance, and the installation complexity and technical requirements of actual engineering are also required to be considered. 3. There is no clear correspondence to parameters related to partial discharge for the internal insulation cracking process, and thus there is no theoretical basis for partial discharge information to evaluate the insulation condition of the cable joint.
Disclosure of Invention
The invention provides a cable joint partial discharge on-line monitoring device, a cable joint partial discharge on-line monitoring method and a power system, which are used for realizing real-time monitoring of a distribution network automation device cable joint, improving the safety and stability of power cable operation, simultaneously having an early warning function and being capable of effectively preventing the accident of insulation breakdown of the power cable joint.
In a first aspect, the present invention provides an on-line monitoring device for partial discharge of a cable joint, comprising: the system comprises a remote terminal, a data acquisition terminal, a sensor and a cable joint to be monitored; the cable joint to be monitored is connected with the sensor in an electromagnetic coupling way, the sensor is electrically connected with the data acquisition terminal, and the data acquisition terminal is in communication connection with the remote terminal;
the sensor is used for collecting current signals in the cable joint to be monitored and feeding the current signals back to the data collection terminal;
the data acquisition terminal processes the received current signal, and converts the current signal into a digital signal after amplification and filtering, and the digital signal is fed back to the remote terminal;
and the remote terminal performs partial discharge feature extraction, pattern recognition and insulation evaluation according to the received digital signals, judges whether to send out an alarm signal according to a diagnosis result, and generates an operation and maintenance result of the cable joint to be monitored.
Optionally, the sensor includes a signal sampling unit, a first storage unit and a first interface unit, where the signal sampling unit is electrically connected with the first storage unit, and the first storage unit is electrically connected with the first interface unit;
The data acquisition terminal comprises a battery module, a second storage unit, a second interface unit, an amplifying circuit, a filter circuit, a digital-to-analog converter and a communication module, wherein the battery module is respectively and electrically connected with the amplifying circuit and the communication module, the amplifying circuit is electrically connected with the filter circuit, the filter circuit is electrically connected with the digital-to-analog converter, the digital-to-analog converter is electrically connected with the second storage unit, and the second storage unit is respectively and electrically connected with the second interface unit and the communication module.
Optionally, the data acquisition terminal is externally connected with a long-life lithium-ion battery and a lithium-ion battery capacitor ER14505, 3+SPC1550, wherein the voltage is 3.6V, the capacity is 7800mAh, the continuous maximum current is 1000mA, the maximum pulse current is 3000mA, the discharge internal resistance is less than 80MΩ, the self-discharge rate of the battery is small, and the storage life of the battery is longer than 10 years;
the sensor is electrically connected with a second interface unit of the data acquisition terminal through the first interface unit;
the data acquisition terminal is in communication connection with the remote terminal through the communication module.
Optionally, the communication unit adopts a BC26 module, has ultra-low power consumption, small volume and simple development, supports the mobile and telecommunication access platform, adopts the national network-to-internet-of-things MQTT protocol for system communication, and the data enters the distribution network management platform of the power supply company through the internet-of-things proxy gateway.
In a second aspect, the invention also provides an electric power system, which comprises the cable joint partial discharge on-line monitoring device provided by the first aspect of the invention.
In a third aspect, the present invention further provides a cable joint partial discharge online monitoring method, which is applied to the cable joint partial discharge online monitoring device provided in the first aspect of the present invention, including:
collecting current signals in the cable joint to be monitored through the cable joint partial discharge on-line monitoring device, amplifying and filtering the current signals through the data collecting terminal, converting the current signals into digital signals, and finally carrying out partial discharge characteristic extraction, pattern recognition and insulation evaluation through the remote terminal, and judging whether to send out corresponding alarm signals according to diagnosis results;
and generating an operation and maintenance result of the cable joint to be monitored according to the alarm signal based on the result of judging whether the corresponding alarm signal is sent out.
Optionally, the cable joint partial discharge on-line monitoring method further includes:
obtaining a partial discharge map of the cable joint partial discharge on-line monitoring device, and generating a defect type of partial discharge caused by the cable joint of the device according to the partial discharge map;
Based on the defect type of partial discharge caused by the cable joint of the device, generating an alarm signal result corresponding to the defect type and uploading the alarm signal result to the cable joint partial discharge on-line monitoring device.
Optionally, the defect type of partial discharge caused by the cable joint of the partial discharge map generating device includes:
if the patterns are in a bulk shape, the distribution is denser, the discharge phases are mainly distributed near the rising edges of 90 degrees and 270 degrees, and the discharge of positive and negative half cycles is symmetrical, so that the defect type of the suspended particles on the insulating surface is generated;
if the discharge phase of the map is distributed at about 90 degrees and 270 degrees and the distribution of the positive half cycle and the negative half cycle is symmetrical, generating the defect type of the air gap in the insulation;
if the atlas is mainly distributed near the rising edge of the negative half cycle, almost no discharge occurs in the positive half cycle, and the connecting pipe burr defect type is generated;
if the discharge quantity and the discharge times of the negative half cycle of the map are more than those of the positive half cycle, and the discharge occurs on the rising edge of the test voltage, the insulation water inlet wet defect type is generated.
Optionally, the generating the alarm signal result corresponding to the defect type based on the defect type of the partial discharge caused by the device cable joint includes:
if the defect type is the insulating surface suspended particles, generating an insulating surface suspended particle alarm signal result;
If the defect type is an insulation internal air gap, generating an insulation internal air gap alarm signal result;
if the defect type is the connecting pipe burr, generating a connecting pipe burr alarm signal result;
and if the defect type is that the insulating water inflow is moist, generating an insulating water inflow moist alarm signal result.
Optionally, the generating the operation and maintenance result of the cable joint to be monitored according to the alarm signal result includes:
if the alarm signal results are suspended particles on the insulating surface, the cable joint to be monitored is cleaned along the insulating surface towards the semi-conductive layer so as to prevent the semi-conductive particles from polluting the main insulating surface, cleaning paper contacted with the connecting pipe or the semi-conductive layer can not be used for cleaning insulation, and before the insulating pipe is contracted, the main insulating surface is ensured to be dry and free of impurities, and meanwhile, the operation environment is improved, and dust generation on the ground or dust fall in the air is prevented;
if the alarm signal result is an insulation internal air gap, polishing the main insulation surface of the cable joint to be monitored by using sand paper to remove the scratch air gap, and then uniformly coating silicone grease on the main insulation surface to repair the main insulation;
if the alarm signal results are burrs of the connecting pipe, the cable joint to be monitored is subjected to indentation sharp corner removal, burrs are polished to be smooth by using a filing cutter, so that the transition of the surface of the connecting pipe is continuous, smooth and burr-free, the aging acceleration of an insulating layer caused by the fact that the electric field intensity is too concentrated at a certain position in the operation is avoided, meanwhile, before the connecting pipe is crimped, sand paper is applied to polish the surface layer of a conductor and the inner wall of the connecting pipe to remove surface oxides, conductive grease or vaseline is coated on a contact surface, the small and stable contact resistance of the connecting point is ensured, and a proper crimping die is selected according to the section of the conductor. After the first pass is completed, whether the crimping is reliable is checked. If necessary, replacing the small first mould or adding a metal gasket between the moulds to continue crimping;
If the alarm signal results in that the insulation water is moist, before the cable connector to be monitored is manufactured, whether the moisture exists in the cable body should be checked, if the moisture exists, moisture removal treatment should be carried out, and the cable can be vacuumized, filled with nitrogen and removed of the moisture. Sometimes, the fault first-aid repair is performed in an environment with high humidity, the main insulating surface of the cable is required to be dried before the insulating tube is contracted, silicone grease is uniformly coated to prevent moisture left on the main insulating surface, waterproof glue is required to be wound at the joint part of the semi-conductive tape and the main insulating of the cable after the outer surface of the core wire connecting tube is wrapped with the semi-conductive tape so as to prevent the moisture left in the core wire of the cable from overflowing to the outside, and waterproof glue is required to be wound between the two ends of the insulating tube and the main insulating of the cable so as to prevent the outside moisture from invading into the cable.
The invention provides an on-line monitoring device for partial discharge of a cable joint, which comprises the following components: the system comprises a remote terminal, a data acquisition terminal, a sensor and a cable joint to be monitored; the cable joint to be monitored is connected with the sensor in an electromagnetic coupling way, the sensor is electrically connected with the data acquisition terminal, and the data acquisition terminal is in communication connection with the remote terminal; the sensor is used for collecting current signals in the cable joint to be monitored and feeding the current signals back to the data collection terminal; the data acquisition terminal processes the received current signal, and converts the current signal into a digital signal after amplification and filtering, and the digital signal is fed back to the remote terminal; the remote terminal performs partial discharge feature extraction, pattern recognition and insulation assessment according to the received digital signals, judges whether to send out alarm signals according to diagnosis results, and generates operation and maintenance results of the cable joint to be monitored.
Drawings
The invention is described in further detail below with reference to the drawings and examples.
Fig. 1 is a block diagram of an on-line monitoring device for partial discharge of a cable joint according to a first embodiment of the present invention;
FIG. 2 is a block diagram of another cable joint partial discharge on-line monitoring device according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power system according to a second embodiment of the present invention;
fig. 4 is a flowchart of a cable joint partial discharge online monitoring method according to a third embodiment of the present invention.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. 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 fall within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.
Example 1
Fig. 1 is a block diagram of an online monitoring device for partial discharge of a cable joint, which is applicable to real-time monitoring and early warning of partial discharge of a cable joint of a power distribution automation device, according to an embodiment of the present invention.
As shown in fig. 1, the cable joint partial discharge on-line monitoring device includes: a remote terminal 140, a data acquisition terminal 130, a sensor 120, and a cable joint 110 to be monitored; the cable joint 110 to be monitored is connected with the sensor 120 in an electromagnetic coupling way, the sensor 120 is electrically connected with the data acquisition terminal 130, and the data acquisition terminal 130 is in communication connection with the remote terminal 140;
the sensor 120 is configured to collect a current signal in the cable connector 110 to be monitored, and feed back the current signal to the data collection terminal 130;
the data acquisition terminal 130 processes the received current signal, amplifies and filters the current signal, converts the current signal into a digital signal, and feeds the digital signal back to the remote terminal 140;
the remote terminal 140 performs partial discharge feature extraction, pattern recognition and insulation evaluation according to the received digital signals, determines whether to send out an alarm signal according to the diagnosis result, and generates the operation and maintenance result of the cable joint 110 to be monitored.
The cable joint 110 to be monitored is a cable joint of any power distribution automation device, and the specific cable joint 110 to be monitored is not limited in this embodiment.
The current signal in the cable joint 110 to be monitored collected by the sensor 120 may further include information such as a device ID, a maximum amplitude value of partial discharge, a sensor state, a maximum temperature value, a maximum humidity value of the cable joint, etc., which is not limited in this embodiment.
On the basis of the above, the data acquisition terminal 130 and the sensor 120 are connected through corresponding matched wires, which can be implemented by adopting the prior art, and the specific model and other conditions of the data acquisition terminal are not limited in this embodiment.
The cable joint partial discharge on-line monitoring device is used for monitoring the cable joint partial discharge of the power distribution network automation equipment, identifying the defect type, providing operation and maintenance measures for power grid operators, and having an early warning function, effectively preventing the accident of insulation breakdown of the power cable joint and improving the safety and stability of the operation of the power cable.
With continued reference to fig. 1 and 2, in accordance with the above-described embodiments, the sensor 120 includes a signal sampling unit, a first storage unit, and a first interface unit, where the signal sampling unit is electrically connected to the first storage unit, and the first storage unit is electrically connected to the first interface unit;
The data acquisition terminal 130 includes a battery module, a second storage unit, a second interface unit, an amplifying circuit, a filtering circuit, a digital-to-analog converter and a communication module, where the battery module is electrically connected with the amplifying circuit and the communication module, the amplifying circuit is electrically connected with the filtering circuit, the filtering circuit is electrically connected with the digital-to-analog converter, the digital-to-analog converter is electrically connected with the second storage unit, and the second storage unit is electrically connected with the second interface unit and the communication module.
The signal sampling unit selects a rogowski coil with the frequency band of 15kHz-20MHz, so that high sensitivity and accuracy of signal sampling are ensured, and the working mode is a self-integration working mode.
The amplifying circuit selects an OPA356 type operational amplifier, the unit gain bandwidth is 450MHz, the conversion speed is 360V/us, the open loop gain is 92dB, the input bias current is 3pA, and the input offset voltage is 5.8Nv/Hz.
The filter circuit adopts a second-order voltage-controlled voltage source low-pass filter circuit to carry out low-pass filtering according to the characteristics of the partial discharge signals of the cable joint. According to the local discharge signal characteristic of the cable joint, an OPA35 type operational amplifier with high unit gain bandwidth is selected, the cut-off frequency of the operational amplifier can be set to be 20kHz, and the requirement of a local discharge signal detection frequency band is met.
The maximum sampling frequency of the digital-to-analog converter is 48kHz, and the input voltage range is 0-1.5V.
The first storage unit, the first interface unit, the battery module, the second storage unit, the second interface unit and the communication unit may all be implemented by using the prior art, and the specific implementation manner and implementation function of the embodiment are not limited.
With continued reference to fig. 1 and fig. 2, on the basis of the above embodiment, the data acquisition terminal 130 is externally connected with a long-life lithium sub-battery and a lithium ion battery capacitor ER14505 ×3+spc1550 through the battery module, the voltage is 3.6v, the capacity is 7800mAh, the continuous maximum current is 1000mA, the maximum pulse current is 3000mA, the internal resistance of discharge is less than 80mΩ, the self-discharge rate of the battery is small, and the storage life of the battery is longer than 10 years;
the sensor 120 is electrically connected to the second interface unit of the data acquisition terminal 130 through the first interface unit;
the data acquisition terminal 130 is communicatively connected to the remote terminal 140 via the communication module.
Optionally, the communication unit adopts a BC26 module, has ultra-low power consumption, small volume and simple development, and supports mobile and telecom access platforms. The system adopts the national network internet of things MQTT protocol for communication, and data enters a distribution network management platform of a power supply company through an internet of things proxy gateway. The data acquisition terminal 130 may establish a connection with the remote terminal 140 through this communication.
Example two
Fig. 3 is a schematic structural diagram of a power system provided by a second embodiment of the present invention, where the power system 500 includes the cable joint partial discharge on-line monitoring device according to any one of the embodiments of the present invention, and the power system 500 provided by the embodiment of the present invention has corresponding functional modules and beneficial effects of the cable joint partial discharge on-line monitoring device.
The power system provided by the embodiment of the invention comprises a cable joint partial discharge on-line monitoring device, wherein the cable joint partial discharge on-line monitoring device comprises: the system comprises a remote terminal, a data acquisition terminal, a sensor and a cable joint to be monitored; the cable joint to be monitored is connected with the sensor in an electromagnetic coupling way, the sensor is electrically connected with the data acquisition terminal, and the data acquisition terminal is in communication connection with the remote terminal; the sensor is used for collecting current signals in the cable joint to be monitored and feeding the current signals back to the data collection terminal; the data acquisition terminal processes the received current signal, and converts the current signal into a digital signal after amplification and filtering, and the digital signal is fed back to the remote terminal; and the remote terminal performs partial discharge feature extraction, pattern recognition and insulation evaluation according to the received digital signals, judges whether to send out an alarm signal according to a diagnosis result, and generates an operation and maintenance result of the cable joint to be monitored. The invention solves the problem that the partial discharge of the cable joint of the distribution automation terminal lacks real-time monitoring, and simultaneously lacks an automatic early warning and forecasting function in case of failure. If the cable joint fails, the cable joint is not overhauled and maintained in time, so that the cable insulation breakdown accident can be caused. The cable joint partial discharge on-line monitoring unit is designed, the local discharge signals acquired on site are sent to the remote computer for analysis and processing, the type of the cable joint partial discharge defects is judged according to the local discharge map, the early warning function is realized, corresponding operation and maintenance measures are taken, the accident of insulation breakdown of the power cable joint can be effectively prevented, and the safety and stability of the operation of the power cable are improved.
In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify operation, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Example III
Fig. 4 is a flowchart of a cable joint partial discharge online monitoring method according to a third embodiment of the present invention, where the present embodiment is applicable to a situation of reducing consumption of manpower and material resources for operation and maintenance of a backup power supply to improve operation safety of a power distribution network, and the cable joint partial discharge online monitoring method is applied to the cable joint partial discharge online monitoring device according to any one of the embodiments of the present invention. As shown in fig. 4, the method for monitoring the partial discharge of the cable joint on line comprises the following steps:
s610, collecting current signals in the cable joint to be monitored through the cable joint partial discharge on-line monitoring device, amplifying and filtering the current signals through the data collecting terminal, converting the current signals into digital signals, finally carrying out partial discharge characteristic extraction, pattern recognition and insulation evaluation through the remote terminal, and judging whether to send out corresponding alarm signals according to diagnosis results.
Specifically, a sensor in the cable joint partial discharge on-line monitoring device is used for obtaining a current signal of the cable joint of the power distribution network automation equipment based on electromagnetic coupling, and the current signal is fed back to the data acquisition terminal. And finally, the digital-to-analog converter selects the collected partial discharge signals and converts the analog signals into digital signals for processing. The remote terminal diagnoses according to the received signals and determines whether to issue a corresponding alarm.
The information of the partial discharge of the cable joint of the power distribution network automation equipment, which is collected by the sensor, is related to the phase distribution, including the information of the discharge time, the discharge times, the discharge quantity, the maximum discharge amplitude and the like, and is processed by the data acquisition terminal and then fed back to the remote terminal. And the remote terminal performs fault type analysis, behavior prediction and early warning prediction. Meanwhile, the remote terminal may display and automatically store various faults. When a predefined incident is detected, all real-time steady state information is automatically recorded for a period of time before and after the incident for post-hoc review, analysis and inversion. The system state monitoring data and the remote control data are automatically stored in the data storage system, and the data storage time is 2 years, so that the system can be searched and inquired at any time.
Optionally, the cable connector of each distribution network automation device can be independently provided with a partial discharge alarm threshold, the partial discharge of the cable connector of any device is monitored in real time by setting parameters at a remote terminal, if the cable connector is abnormal, the remote terminal can check the position of the abnormal cable connector and send an audible and visual alarm signal at the position, and meanwhile, fault information is sent to power grid working operation and maintenance personnel through a short message.
Optionally, in an embodiment, before the cable joint partial discharge online monitoring device determines the corresponding operation and maintenance policy for the cable joint to be monitored, the functions of user authority management, security login management, system version management and the like may be implemented through a master station system of the cable joint partial discharge online monitoring device.
Specifically, in the user authority management, a plurality of operator accounts are configured, different function authorities are set according to the levels, the user authority management may include user account passwords adding, modifying, deleting and authority level setting management, and the specific user authority range may be selectively increased or decreased by a person skilled in the art according to actual requirements, which is not limited in this embodiment. The method can realize the reediting of the account information of the operator when the personnel mobilize at any time. Meanwhile, the system adopts a modularized design, and performs backup design on key links, so that key data information loss caused by faults of system hardware and software is prevented.
The safe login management is that a person skilled in the art using the cable joint partial discharge on-line monitoring device can log in by inputting an account number and a password, can log in by dynamic face recognition, and can log in different places.
And the system version management is to manage the system version of the master station and manage the software version of the power distribution automation terminal cable joint partial discharge on-line monitoring device according to the authority.
Further, in this embodiment, for assisting distribution network operators in developing intelligent operation and maintenance work of distribution network automation equipment, operation and maintenance manpower and material resource consumption is reduced, safe and stable operation of the power cable is guaranteed in real time, and the remote terminal has a fault automatic diagnosis function. Meanwhile, the error condition inspection and corresponding processing can be carried out on the received data, so that safe data sharing with modules such as large-screen display, report service and alarm processing can be realized.
S620, based on the result of judging whether to send out the corresponding alarm signal, generating the operation and maintenance result of the cable joint to be monitored according to the alarm signal.
Specifically, the alarm signal is generated through a remote terminal in the cable joint partial discharge on-line monitoring device, and an operation and maintenance result of the cable joint to be monitored is generated.
On the basis, if the defect type is the insulating surface suspended particles, generating an insulating surface suspended particle alarm signal result; if the defect type is an insulation internal air gap, generating an insulation internal air gap alarm signal result; if the defect type is the connecting pipe burr, generating a connecting pipe burr alarm signal result; and if the defect type is that the insulating water inflow is moist, generating an insulating water inflow moist alarm signal result.
If the alarm signal results in suspended particles on the insulating surface, the cable joint to be monitored is cleaned along the insulating surface towards the semi-conductive layer so as to prevent the semi-conductive particles from polluting the main insulating surface, and cleaning paper contacted with the connecting pipe or the semi-conductive layer can not be used for cleaning insulation. Before the insulating tube is contracted, the main insulating surface is ensured to be dry and free of impurities, the operation environment is improved, and dust generation on the ground or dust fall in the air is prevented;
if the alarm signal result is an insulation internal air gap, polishing the main insulation surface of the cable joint to be monitored by using sand paper to remove the scratch air gap, and then uniformly coating silicone grease on the main insulation surface to repair the main insulation;
If the alarm signal results are burrs of the connecting pipe, the cable joint to be monitored is removed from the indentation sharp corner, and the burrs are polished to be smooth by using a filing knife, so that the surface transition of the connecting pipe is continuous, smooth and burr-free, and the aging acceleration of an insulating layer at a certain position due to the fact that the electric field intensity is too concentrated in the operation is avoided. And before the connecting pipe is in compression joint, the surface layer of the conductor and the inner wall of the connecting pipe are polished by sand paper to remove surface oxides, and conductive grease or vaseline is coated on the contact surface to ensure that the contact resistance of the connecting point is small and stable. A suitable crimping die is selected according to the conductor cross section. After the first pass is completed, whether the crimping is reliable is checked. If necessary, the small first die is replaced or a metal gasket is added between the dies to continue the compression joint.
If the alarm signal results in that the insulation water is moist, the cable connector to be monitored is checked for the presence of moisture in the cable body before being manufactured. If moisture exists, the moisture removal treatment is carried out firstly, and the cable can be vacuumized, filled with nitrogen and used for removing the moisture. Sometimes, the fault repair is performed in an environment with high humidity, and before the insulation tube is contracted, the main insulation surface of the cable is dried and evenly coated with silicone grease so as to prevent water left on the main insulation surface. After the outer surface of the core wire connecting pipe is wrapped with the semi-conductive tape, a waterproof adhesive is wrapped at the joint of the semi-conductive tape and the main insulation of the cable so as to prevent the residual moisture in the cable core wire from overflowing to the outside. A waterproof adhesive is wound between the two ends of the insulating tube and the main insulation of the cable so as to prevent external moisture from invading into the cable.
Further, when it is judged that the insulating water is wet, a baking method may be used. Baking with a burner or charcoal fire to remove moisture. This method can only be used with small amounts of moisture. When the paper insulating core wire is heavily subjected to moisture, a waxing method can be adopted, and the moisture is removed by using hot wax. The cable lead sleeve is prepared by mixing 60% of white wax and 40% of medium vaseline, heating to 130-140 ℃ and decocting, wherein the temperature is controlled to be 120-130 ℃ when the wax is poured, the wax is gradually moved to the cut from the 10-15cm position of the cut of the cable lead sleeve on two sides, and then the wax is poured to the center of the joint after the wax is coagulated at the cut until no bubbles and no immersed sound exist on the core wire.
According to the technical scheme provided by the embodiment of the invention, the current signal in the cable joint to be monitored is collected through the cable joint partial discharge on-line monitoring device, the current signal is amplified and filtered through the data collection terminal and then is converted into a digital signal, and finally, the remote terminal performs partial discharge characteristic extraction, pattern recognition and insulation evaluation, and whether a corresponding alarm signal is sent out or not is judged according to a diagnosis result; and generating an operation and maintenance result of the cable joint to be monitored according to the alarm signal based on the result of judging whether the corresponding alarm signal is sent out. The invention transmits the partial discharge information of the cable connector running in the dark to the monitoring platform in real time, and realizes the timely early warning of the hidden danger of cable insulation, thereby avoiding the occurrence of serious accidents of the power grid and having great significance for the safe running of the power grid.
Example IV
In some embodiments, the cable splice partial discharge online monitoring method may be implemented as a computer program tangibly embodied on a computer-readable storage medium. Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An on-line monitoring device for partial discharge of a cable joint, comprising: the system comprises a remote terminal, a data acquisition terminal, a sensor and a cable joint to be monitored; the cable joint to be monitored is connected with the sensor in an electromagnetic coupling way, the sensor is electrically connected with the data acquisition terminal, and the data acquisition terminal is in communication connection with the remote terminal;
the sensor is used for collecting current signals in the cable joint to be monitored and feeding the current signals back to the data collection terminal;
The data acquisition terminal processes the received current signal, and converts the current signal into a digital signal after amplification and filtering, and the digital signal is fed back to the remote terminal;
and the remote terminal performs partial discharge feature extraction, pattern recognition and insulation evaluation according to the received digital signals, judges whether to send out an alarm signal according to a diagnosis result, and generates an operation and maintenance result of the cable joint to be monitored.
2. The device for on-line monitoring of partial discharge of a cable joint according to claim 1, wherein the sensor comprises a signal sampling unit, a first storage unit and a first interface unit, the signal sampling unit is electrically connected with the first storage unit, and the first storage unit is electrically connected with the first interface unit;
the data acquisition terminal comprises a battery module, a second storage unit, a second interface unit, an amplifying circuit, a filter circuit, a digital-to-analog converter and a communication module, wherein the battery module is respectively and electrically connected with the amplifying circuit and the communication module, the amplifying circuit is electrically connected with the filter circuit, the filter circuit is electrically connected with the digital-to-analog converter, the digital-to-analog converter is electrically connected with the second storage unit, and the second storage unit is respectively and electrically connected with the second interface unit and the communication module.
3. The on-line monitoring device for partial discharge of the cable joint according to claim 2, wherein the data acquisition terminal is externally connected with a long-life lithium sub-battery and a lithium ion battery capacitor ER14505, 3+SPC1550, wherein the voltage is 3.6V, the capacity is 7800mAh, the continuous maximum current is 1000mA, the maximum pulse current is 3000mA, the internal resistance of discharge is less than 80MΩ, the self-discharge rate of the battery is small, and the storage life of the battery is longer than 10 years;
the sensor is electrically connected with a second interface unit of the data acquisition terminal through the first interface unit;
the data acquisition terminal is in communication connection with the remote terminal through the communication module.
4. The device for on-line monitoring of partial discharge of cable joint according to claim 2, wherein the communication unit adopts a BC26 module, has ultra-low power consumption, small volume and simple development, supports mobile and telecom access platforms, adopts the national network internet of things MQTT protocol for system communication, and the data enters the distribution network management platform of the power supply company through the internet of things proxy gateway.
5. An electrical power system comprising the cable joint partial discharge on-line monitoring device of any one of claims 1-4.
6. An online monitoring method for partial discharge of a cable joint, which is applied to the online monitoring device for partial discharge of a cable joint according to any one of claims 1-4, and is characterized by comprising the following steps:
collecting current signals in the cable joint to be monitored through the cable joint partial discharge on-line monitoring device, amplifying and filtering the current signals through the data collecting terminal, converting the current signals into digital signals, and finally carrying out partial discharge characteristic extraction, pattern recognition and insulation evaluation through the remote terminal, and judging whether to send out corresponding alarm signals according to diagnosis results;
and generating an operation and maintenance result of the cable joint to be monitored according to the alarm signal based on the result of judging whether the corresponding alarm signal is sent out.
7. The method for on-line monitoring of partial discharge of a cable joint according to claim 6, further comprising:
obtaining a partial discharge map of the cable joint partial discharge on-line monitoring device, and generating a defect type of partial discharge caused by the cable joint of the device according to the partial discharge map;
based on the defect type of partial discharge caused by the cable joint of the device, generating an alarm signal result corresponding to the defect type and uploading the alarm signal result to the cable joint partial discharge on-line monitoring device.
8. The method for on-line monitoring of partial discharge of a cable joint according to claim 7, wherein the generating means of the partial discharge map includes:
if the patterns are in a bulk shape, the distribution is denser, the discharge phases are mainly distributed near the rising edges of 90 degrees and 270 degrees, and the discharge of positive and negative half cycles is symmetrical, so that the defect type of the suspended particles on the insulating surface is generated;
if the discharge phase of the map is distributed at about 90 degrees and 270 degrees and the distribution of the positive half cycle and the negative half cycle is symmetrical, generating the defect type of the air gap in the insulation;
if the atlas is mainly distributed near the rising edge of the negative half cycle, almost no discharge occurs in the positive half cycle, and the connecting pipe burr defect type is generated;
if the discharge quantity and the discharge times of the negative half cycle of the map are more than those of the positive half cycle, and the discharge occurs on the rising edge of the test voltage, the insulation water inlet wet defect type is generated.
9. The method for online monitoring of partial discharge of a cable joint according to claim 7, wherein the generating an alarm signal result corresponding to a defect type based on the defect type of the partial discharge caused by the cable joint comprises:
if the defect type is the insulating surface suspended particles, generating an insulating surface suspended particle alarm signal result;
If the defect type is an insulation internal air gap, generating an insulation internal air gap alarm signal result;
if the defect type is the connecting pipe burr, generating a connecting pipe burr alarm signal result;
and if the defect type is that the insulating water inflow is moist, generating an insulating water inflow moist alarm signal result.
10. The method for on-line monitoring of partial discharge of a cable joint according to claim 6, wherein the generating the operation and maintenance result of the cable joint to be monitored according to the alarm signal result comprises:
if the alarm signal results are suspended particles on the insulating surface, the cable joint to be monitored is cleaned along the insulating surface towards the semi-conductive layer so as to prevent the semi-conductive particles from polluting the main insulating surface, cleaning paper contacted with the connecting pipe or the semi-conductive layer can not be used for cleaning insulation, and before the insulating pipe is contracted, the main insulating surface is ensured to be dry and free of impurities, and meanwhile, the operation environment is improved, and dust generation on the ground or dust fall in the air is prevented;
if the alarm signal result is an insulation internal air gap, polishing the main insulation surface of the cable joint to be monitored by using sand paper to remove the scratch air gap, and then uniformly coating silicone grease on the main insulation surface to repair the main insulation;
If the alarm signal results are burrs of the connecting pipe, the cable joint to be monitored is subjected to indentation sharp corner removal, burrs are polished to be smooth by using a filing cutter, so that the transition of the surface of the connecting pipe is continuous, smooth and burr-free, the aging acceleration of an insulating layer caused by the fact that the electric field intensity is too concentrated at a certain position in the operation is avoided, meanwhile, before the connecting pipe is crimped, sand paper is applied to polish the surface layer of a conductor and the inner wall of the connecting pipe to remove surface oxides, conductive grease or vaseline is coated on a contact surface, the small and stable contact resistance of the connecting point is ensured, and a proper crimping die is selected according to the section of the conductor. After the first pass is completed, whether the crimping is reliable is checked. If necessary, replacing the small first mould or adding a metal gasket between the moulds to continue crimping;
if the alarm signal results in that the insulation water is moist, before the cable connector to be monitored is manufactured, whether the moisture exists in the cable body should be checked, if the moisture exists, moisture removal treatment should be carried out, and the cable can be vacuumized, filled with nitrogen and removed of the moisture. Sometimes, the fault first-aid repair is performed in an environment with high humidity, the main insulating surface of the cable is required to be dried before the insulating tube is contracted, silicone grease is uniformly coated to prevent moisture left on the main insulating surface, waterproof glue is required to be wound at the joint part of the semi-conductive tape and the main insulating of the cable after the outer surface of the core wire connecting tube is wrapped with the semi-conductive tape so as to prevent the moisture left in the core wire of the cable from overflowing to the outside, and waterproof glue is required to be wound between the two ends of the insulating tube and the main insulating of the cable so as to prevent the outside moisture from invading into the cable.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117538710A (en) * | 2023-12-14 | 2024-02-09 | 四川大唐国际甘孜水电开发有限公司 | Intelligent early warning method and system for local dynamic discharge monitoring |
| CN117554768A (en) * | 2024-01-12 | 2024-02-13 | 广州南网科研技术有限责任公司 | Cable accessory partial discharge monitoring method |
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2023
- 2023-07-13 CN CN202310864254.7A patent/CN116679177A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117538710A (en) * | 2023-12-14 | 2024-02-09 | 四川大唐国际甘孜水电开发有限公司 | Intelligent early warning method and system for local dynamic discharge monitoring |
| CN117554768A (en) * | 2024-01-12 | 2024-02-13 | 广州南网科研技术有限责任公司 | Cable accessory partial discharge monitoring method |
| CN117554768B (en) * | 2024-01-12 | 2024-03-15 | 广州南网科研技术有限责任公司 | Cable accessory partial discharge monitoring method |
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