CN112557962B - Distribution cable true test system based on multi-dimensional digital fault inversion and application method - Google Patents
Distribution cable true test system based on multi-dimensional digital fault inversion and application method Download PDFInfo
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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
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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
- G01R31/08—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
- G01R31/12—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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- 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
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Abstract
The invention discloses a distribution cable true test system based on multi-dimensional digital fault inversion and an application method, wherein the system comprises: the distribution cable channel simulation system is used for simulating a real distribution cable laying mode, an operation environment and a fault condition and reproducing the working condition of the distribution cable under the actual operation condition; the distribution cable test control system is used for developing various distribution cable true tests according to the simulation environment of the distribution cable channel simulation system and verifying the distribution cable fault detection and diagnosis technology under different test conditions. The invention provides a distribution cable true test system based on multi-dimensional digital fault inversion; the effectiveness and the accuracy of the distribution cable fault detection method can be comprehensively evaluated by simulating and reproducing the running state of the cable under the abnormal working condition in the true cable test system and carrying out tests aiming at the fault working condition and the running performance of the distribution cable under various complex conditions.
Description
Technical Field
The invention belongs to the technical field of power cable operation tests, and particularly relates to a distribution cable true test system based on multi-dimensional digital fault inversion and an application method.
Background
In the long-term operation process of the distribution cable, the insulation performance of the distribution cable is gradually deteriorated under the influence of the product quality and the installation and manufacturing process of the distribution cable, and under the action of various pollutants, harmful substances, wind, sunlight and other media in the environment. As the life of a distribution cable increases, the problem of distribution cable failure becomes more and more severe, along with the existence of various potential defects and problems. The method and the device are used for detecting and diagnosing various fault defects possibly existing in the actual operation working condition of the distribution cable, and have important significance for accurately finding and timely eliminating faults and recovering power supply.
The related detection and diagnosis technology of the distribution cable fault has no or few reliable test system and evaluation method for a long time, the traditional method generally verifies the distribution cable fault detection and diagnosis technology through a theoretical calculation or simulation mode, the influence of various environmental factors in actual operation conditions on the actual application of the fault detection and diagnosis technology cannot be considered only through theoretical analysis and computer simulation, meanwhile, the actual fault data and the data under an ideal condition have great difference, so that the actual application effect and the effect under the ideal condition have great difference, and finally missed diagnosis and misdiagnosis and substantial economic loss can be caused.
In view of the above, a new distribution cable true test system based on multi-dimensional digital fault inversion and an application method thereof are urgently needed.
Disclosure of Invention
The invention aims to provide a distribution cable true type test system based on multi-dimensional digital fault inversion and an application method thereof, so as to solve one or more technical problems. The invention provides a distribution cable true test system based on multi-dimensional digital fault inversion; the effectiveness and the accuracy of the distribution cable fault detection method can be comprehensively evaluated by simulating and reproducing the running state of the cable under the abnormal working condition in the true cable test system and carrying out tests aiming at the fault working condition and the running performance of the distribution cable under various complex conditions.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a distribution cable true test system based on multi-dimensional digital fault inversion, which comprises:
the distribution cable channel simulation system is used for simulating a real distribution cable laying mode, an operation environment and a fault condition and reproducing the working condition of the distribution cable under the actual operation condition;
the distribution cable test control system is used for developing various distribution cable true tests according to the simulation environment of the distribution cable channel simulation system and verifying the distribution cable fault detection and diagnosis technology under different test conditions;
wherein the distribution cable channel simulation system comprises: the system comprises a ring main unit, a water tank section, a pipe arrangement section, a tunnel section, a direct-buried section, an alternating current-direct current hybrid cable channel, an outdoor terminal area, a terminal cabinet, a switch cabinet, a cable defect box and a plurality of work wells, wherein the distribution cable laying mode is changed by controlling and combining all sections of the distribution cable channel, and various faults are set at different positions through the cable defect box to construct the fault state of the distribution cable;
the distribution cable test control system comprises: outdoor test area and indoor control console; the outdoor test district sets up various test equipment and monitoring devices, the indoor control cabinet carries out various distribution cable true type experiments through controlling various test equipment, gathers distribution cable's operating data and environmental parameter through monitoring devices, carries out distribution cable fault detection and location technology's verification.
In a further improvement of the present invention, the ac/dc hybrid cable channel includes: an AC cable ring network channel and a DC cable channel; the alternating current cable looped network channel comprises:
2-circuit 10 kV/1-circuit 380V alternating current cable for partial discharge and fault location tests; wherein, the 1-circuit 10kV alternating current cable is used for a temperature rise test; the other 1-time 10kV alternating-current cable is used for carrying capacity test under the condition of cable dense laying;
the direct current cable channel includes:
2-circuit 10kV direct current cable for partial discharge defect test;
wherein, two cable channels pass through tunnel connection with indoor control cabinet, and many times cable passes through the cubical switchboard and is connected with test equipment.
In a further improvement of the present invention, the ac cable ring network channel comprises: the first ring main unit and the second ring main unit;
the first ring main unit is connected with the outdoor terminal area, and the connecting channel is provided with a water tank section, a pipe arrangement section and a tunnel section and is used for simulating the environment of a distribution cable channel; the outdoor terminal area is connected with the simulation cabinet and the 10kV switch group through the terminal cabinet;
the second ring network cabinet is connected with the 10kV switch cabinet, and a direct-buried section and a plurality of cable defect boxes are arranged on the connecting channel and used for simulating the distribution cable channel environment and the actual fault condition;
the direct-current cable is connected with the 10kV switch cabinet through an outdoor terminal, and a plurality of cable defect boxes are arranged on a connecting channel and used for simulating the direct-current fault condition of the distribution cable;
the working conditions of independent operation of the direct-current distribution cable, independent operation of the alternating-current distribution cable and mixed operation of the alternating-current and direct-current cables can be simulated by controlling the 10kV switch cabinet.
The outdoor test area comprises one or more of a box-type transformer, a medium-low voltage power distribution cabinet, a cable temperature rise test device, a non-partial discharge power frequency voltage withstand test device, a medium-voltage cable control device, a cable fault positioning operation device and an offline partial discharge detection device; the box-type transformer and the medium-low voltage power distribution cabinet are used for providing power for each test device, and each test device is used for simulating and changing test conditions and carrying out test operation;
the monitoring device arranged in the outdoor test area comprises an operating parameter acquisition device, a tunnel environment monitoring device and an online partial discharge monitoring device, and is used for acquiring operating data and environmental parameters in a power distribution cable fault test.
The invention has the further improvement that the cable defect box is internally provided with normal cables and various typical cable fault short samples and is provided with a cable switching automatic switch; the automatic switch adopts a PLC to control a cable node to switch between a normal cable and a cable fault short sample.
The invention has the further improvement that various test devices and monitoring devices are integrated with wireless communication modules; the indoor control console issues an operation instruction through the wireless communication module to control the switch and the operation parameters of each test device, and the monitoring device uploads the collected operation data and the environmental parameters through the wireless communication module.
The invention discloses an application method of a distribution cable true test system based on multi-dimensional digital fault inversion, which is used for evaluating a distribution cable fault detection method and comprises the following specific steps:
step 3, changing the position or the fault type of the fault of the distribution cable, and repeating the evaluation of the fault detection method in the step 2 for N times to obtain N groups of test result evaluation index fractional vectors; calculating an accuracy score C, an accuracy score P and a rapidity score T of evaluation indexes of the power distribution cable fault detection method according to the obtained vector group, and determining the grade of each index;
and 4, endowing weighted values to all evaluation indexes of the distribution cable fault detection method to be verified and evaluated by an analytic hierarchy process, comprehensively calculating to obtain a comprehensive evaluation score of the distribution cable fault detection method to be verified and evaluated, and determining a comprehensive evaluation grade.
A further improvement of the invention is that the step of multi-dimensional digital fault inversion comprises:
and 2, setting a comparison line based on the distribution cable fault sample data obtained in the step 1, keeping the cable fault type in the cable defect box unchanged, obtaining the environmental humidity by controlling and changing the cable mean water level depth and the cable laying density, monitoring the cable current-carrying capacity, the cable surface temperature and the local discharge capacity of the distribution cable running in the line until the acquired data and the data in the obtained fault sample data are kept in a preset error range, and completing fault inversion.
A further improvement of the present invention is that in step 1 of the multi-dimensional digital fault inversion, the various tests performed include one or more of the following tests:
the control cable defect box is provided with replaceable simulated fault cables at different laying sections of the cable, collects distribution cable operation parameters and environment parameters under different fault states, and carries out distribution cable fault simulation and state detection tests;
controlling non-partial discharge power frequency voltage withstand test equipment, applying power frequency high voltage to three phases of a cable line, detecting the local discharge amount of a distribution cable, collecting operation parameters and environmental parameters of the distribution cable, and carrying out a power frequency voltage withstand test and an online partial discharge test of the distribution cable; in an off-line state, controlling a cable defect box to set a partial discharge defect, collecting operation parameters and environment parameters of a distribution cable, and carrying out an off-line partial discharge simulation test of the distribution cable;
controlling a cable line water tank laying section, setting a cable water level depth, simulating a cable underwater operation environment, controlling a cable temperature rise test device, applying current to heat a conductor to a conductor temperature during normal operation, collecting operation parameters and environment parameters of a distribution cable, and carrying out a distribution cable and accessory waterproof capability test;
the method comprises the steps of controlling the intensive laying section of the distribution cable, changing the intensive degree of the cable, controlling temperature rise test equipment, changing the environmental temperature of the intensive laying section of the distribution cable, detecting the current-carrying capacity and temperature data of the distribution cable, collecting the operation parameters and environmental parameters of the distribution cable, and carrying out the current-carrying capacity test under the intensive laying condition of the cable.
Compared with the prior art, the invention has the following beneficial effects:
the true type test system for the distribution cable provided by the invention simulates the complex running environment of various distribution cable channels by connecting and combining various environment channel sections of the distribution cable, changes the environment parameters and test conditions by controlling the running and test equipment of the distribution cable, can reproduce the fault state of the distribution cable under the real working condition, realizes the fault test of the distribution cable under various complex environment conditions, and furthest restores the electrical environment and the physical environment under the real condition. The system structure design of the invention is composed of an alternating current and direct current hybrid channel, realizes the complex working condition of the running of the alternating current and direct current hybrid cable by controlling the running states of the alternating current ring network channel and the direct current cable channel in a combined way, and develops the distribution cable test aiming at various running working conditions of alternating current, direct current and alternating current and direct current multiplexing.
According to the multi-dimensional digital fault inversion method provided by the invention, the operation data and the environmental parameters of various distribution cables under real faults are acquired, and after the multi-dimensional digital signals are amplified, shifted and the like, the test equipment is directly controlled to enable the fault state in the real cables to reappear in a true test system, so that the multi-dimensional digital fault inversion method has the advantages of quick response, accurate control, simplicity and easiness in implementation.
The application of the invention is used for evaluating the fault detection of the distribution cable, three indexes of accuracy, precision and rapidity are provided aiming at the verification of the fault detection method of the distribution cable, the index weight is given by adopting an analytic hierarchy process by comprehensively considering the technical rigid index and the artificial subjective requirement, multi-angle analysis is carried out under various test conditions based on multiple test data, and the general requirements of the effectiveness and the accuracy verification of a new technology for positioning the fault of the cable and detecting the state are met. The method comprises the steps of building a distribution cable true test system, simulating a complex environment of a distribution cable channel, reproducing abnormal working conditions of actual operation of the distribution cable, developing related tests of fault detection and diagnosis of various distribution cables based on real fault conditions and collecting data, evaluating actual effects of detection and diagnosis technologies, verifying validity and accuracy, reducing fault power failure, improving power supply reliability of a distribution network, and providing continuous and reliable power supply for users.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a block diagram of a true test system for a distribution cable based on multi-dimensional digital fault inversion, according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a complex environment simulation system for a distribution cable channel according to an embodiment of the present invention;
fig. 3 is a schematic view of a comprehensive evaluation flow of a distribution cable fault detection method in application of the embodiment of the present invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1 and fig. 2, a distribution cable true type testing system based on multidimensional digital fault inversion according to an embodiment of the present invention includes:
the distribution cable channel simulation system is used for simulating a real distribution cable laying mode, an operation environment and a fault condition and reproducing the working condition of the distribution cable under the actual operation condition;
the distribution cable test control system is used for developing various distribution cable true tests according to the simulation environment of the distribution cable channel simulation system and verifying the distribution cable fault detection and diagnosis technology under different test conditions;
wherein, distribution cable passageway analog system includes looped netowrk cabinet, basin section, calandria section, tunnel section, direct-burried section, alternating current-direct current series-parallel connection cable channel, outdoor termination district, terminal cabinet, cubical switchboard, cable defect case and a plurality of worker's well, through control and combination each section of distribution cable passageway changes distribution cable laying mode, through cable defect case sets up all kinds of troubles in different positions, founds distribution cable fault state.
In another embodiment of the present invention, the distribution cable channel simulation system includes two channels, i.e., an ac cable ring network channel and a dc cable channel, to form an ac/dc hybrid cable channel.
The alternating current-direct current hybrid cable channel comprises an alternating current cable ring network channel and a direct current cable channel, the alternating current cable ring network channel comprises a 2-circuit 10 kV/1-circuit 380V alternating current cable for partial discharge and fault location tests, a 1-circuit 10kV alternating current cable for temperature rise tests, and a 1-circuit 10kV alternating current cable for current-carrying capacity tests under the condition of cable intensive laying; the direct current cable channel comprises a 2-circuit 10kV direct current cable used for partial discharge defect tests. The two cable channels are connected with the control room through a tunnel, and the multi-loop cable is connected with the test equipment through a switch cabinet.
In another embodiment of the present invention, the ac cable ring network channel includes two ring network cabinets, the ring network cabinet 1 is connected to the outdoor terminal area, the connection channel thereof is provided with a sink section, a pipe section and a tunnel section for simulating the distribution cable channel environment, and the outdoor terminal area is connected to the simulation cabinet and the 10kV switch group through the terminal cabinet; the ring main unit 2 is connected with a 10kV switch cabinet, and a direct-buried section and a plurality of cable defect boxes are arranged on a connecting channel of the ring main unit and are used for simulating the environment and the actual fault condition of a distribution cable channel.
The direct current cable line is connected with the 10kV switch cabinet through the outdoor terminal, and a plurality of cable defect boxes are arranged on a connecting channel of the direct current cable line and used for simulating the direct current fault condition of the distribution cable.
The working conditions of independent operation of a direct-current distribution cable, independent operation of an alternating-current distribution cable and mixed operation of the alternating-current and direct-current cables are simulated by controlling a 10kV switch cabinet.
The distribution cable test control system comprises: outdoor test area and indoor control console; the outdoor test district sets up various test equipment and monitoring devices, the indoor control cabinet carries out various distribution cable true type experiments through controlling various test equipment, gathers distribution cable's operating data and environmental parameter through monitoring devices, carries out distribution cable fault detection and location technology's verification.
In an embodiment of the present invention, the outdoor test area includes one or more of the following devices: the system comprises a box-type transformer, a medium-low voltage power distribution cabinet, a cable temperature rise test device, a non-partial discharge power frequency voltage withstand test device, a medium-voltage cable control device, a cable fault positioning operation device and an off-line partial discharge detection device, wherein the box-type transformer and the medium-low voltage power distribution cabinet provide power for each test device, and each test device is used for simulating and changing test conditions and carrying out test operation. The device is provided with an operation parameter acquisition device, a tunnel environment monitoring device, an online partial discharge monitoring device and a reserved platform and is used for acquiring operation data and environment parameters in a power distribution cable fault test.
In the embodiment of the invention, the indoor control console remotely controls the various test equipment and the monitoring equipment, simulates and changes test conditions, collects various operation data and environmental parameters, and carries out one or more of the following tests:
the method comprises the steps that through controlling a cable defect box, rapidly replaceable simulated fault cables are arranged at different laying sections of the cables, distribution cable operation parameters and environment parameters under different fault states are collected, and distribution cable fault simulation and state detection tests are carried out;
the method comprises the steps that power frequency high voltage is applied to three phases of a cable line by controlling non-partial-discharge power frequency voltage withstand test equipment, the local discharge amount of a distribution cable is detected, the running parameters and the environmental parameters of the distribution cable are collected, the power frequency voltage withstand test and the online partial discharge test of the distribution cable are carried out, the defect box of the distribution cable is controlled to set partial discharge defects in an offline state, the running parameters and the environmental parameters of the distribution cable are collected, and the offline partial discharge simulation test of the distribution cable is carried out;
by controlling the cable line water tank laying section, setting the cable water level depth, simulating the cable underwater operation environment, controlling the cable temperature rise test equipment, applying current to heat the conductor to the conductor temperature during normal operation, collecting the operation parameters and environment parameters of the distribution cable, and carrying out the waterproof capability test of the distribution cable and accessories;
through controlling the intensive section of laying of distribution cable, change the intensive degree of cable, control temperature rise test equipment changes the intensive section ambient temperature of laying of distribution cable, detects distribution cable current-carrying capacity and temperature data, gathers distribution cable operating parameter and environmental parameter, carries out the current-carrying capacity test under the intensive condition of laying of cable.
Furthermore, all kinds of test equipment and monitoring devices are integrated to have wireless communication module, and the indoor control cabinet issues operating instruction through wireless communication module, controls the switch and the running parameter of each test equipment, carries out remote control and switching in the high in the clouds, and monitoring devices passes through wireless communication module and uploads the high in the clouds with the running data and the environmental parameter of gathering in real time.
Referring to fig. 3, an application method of the distribution cable true type testing system according to the above embodiment of the present invention specifically includes: a distribution cable multi-dimensional digital fault inversion method and a distribution cable fault detection evaluation method are provided.
According to the distribution cable multi-dimensional digital fault inversion method, the abnormal working conditions under the real running condition of the distribution cable are reproduced in the test system by acquiring the running data and the environmental parameters of the real fault condition of the distribution cable and processing and amplifying the acquired data. According to the distribution cable fault detection and evaluation method, the effectiveness and the accuracy of the distribution cable fault detection method are evaluated by constructing a distribution cable fault detection and evaluation index system, distribution cable fault detection and evaluation indexes are determined, the evaluation indexes are graded, a weighted value is given to the distribution cable fault detection indexes, and a comprehensive evaluation result of the distribution cable fault detection is obtained through calculation.
The invention has the further improvement that the distribution cable multidimensional digital fault inversion method comprises the following steps:
And 2, setting a comparison line based on the fault sample data obtained in the step 1, keeping the cable fault type in the cable defect box unchanged, monitoring the cable current-carrying capacity, the cable surface temperature and the local discharge capacity of the distribution cable running in the line by controlling and changing the cable mean water level depth, the cable laying density and the environment humidity until the acquired data and the data in the obtained fault sample data are kept in a certain error range, and finishing fault inversion.
The invention further improves that the fault detection and evaluation method of the distribution cable comprises the following steps:
step 3, changing the position or the fault type of the fault of the distribution cable, repeating the fault detection method evaluation of the step 2 for N times to obtain N groups of test result evaluation index score vectors, calculating the accuracy score C, the accuracy score P and the rapidity score T of the evaluation index of the fault detection method of the distribution cable according to the vector group, and determining the grade of each index;
and 4, giving weight values to all evaluation indexes of the distribution cable fault detection method through an analytic hierarchy process, finally obtaining a comprehensive evaluation score of the distribution cable fault detection method through comprehensive calculation, and determining a comprehensive evaluation grade.
The invention constructs an AC/DC hybrid cable channel, synchronously develops test tests of AC cables, DC cables and AC/DC multiplexing cable lines, constructs and restores a real complex cable channel of a medium-low voltage AC/DC distribution network, builds a test system consisting of a typical 'direct burial, channel, calandria, tunnel' laying mode and 'water immersion, local high temperature, vibration and fire' operating environment, develops distribution cable performance tests and verification tests such as fault simulation, state detection, partial discharge monitoring, waterproof performance and the like, and monitors distribution cable test parameters in the whole process in real time through an online monitoring device. By constructing and simulating real distribution cable faults in an actual operation environment, high-precision multi-dimensional digital inversion is carried out on fault sample data acquired in a real cable network, the real physical environment and various electrical environments are restored to the maximum extent, evaluation indexes of a distribution cable fault detection method are established, and effectiveness and accuracy of the distribution cable fault detection method are comprehensively evaluated.
The invention provides a fault inversion-based distribution cable complex environment true type simulation test system and an evaluation method, which can restore the true physical environment and various electrical environments to the maximum extent, develop various distribution cable true type tests, comprehensively evaluate the fault detection method level of the distribution cable under the actual operation condition, further develop the test evaluation and verification of the effectiveness and adaptability of the novel cable insulation state detection technology, and have important practical significance for the test research and evaluation of the cable line fault condition real-time online positioning technology, the intelligent integrated cable operation and maintenance technology and the laying channel disaster prevention technology.
In a specific embodiment, the invention provides a distribution cable true test system based on multi-dimensional digital fault inversion, and a structural block diagram of the system is shown in fig. 1 and mainly comprises a distribution cable channel simulation system and a distribution cable test control system.
The main working flow of the system provided by the embodiment of the invention is that the distribution cable channel simulation system simulates a real distribution cable laying mode, an operation environment and a fault condition, the working condition of a distribution cable under an actual operation condition is reproduced, the distribution cable test system controls test equipment, various distribution cable true tests are carried out based on the distribution cable channel simulation environment, and the distribution cable fault detection and diagnosis technology is verified under different test conditions. The main components of the distribution cable channel simulation system comprise a ring main unit, a water tank section, a pipe arrangement section, a tunnel section, a direct-buried section, an alternating current-direct current hybrid cable channel, an outdoor terminal area, a terminal cabinet, a switch cabinet, a cable defect box and a plurality of work wells.
In the embodiment of the invention, the main structure of the distribution cable channel simulation system is composed of two channels, namely an alternating current cable ring network channel and a direct current cable channel, which form an alternating current and direct current hybrid cable channel, as shown in fig. 2.
The alternating current cable ring network channel comprises two ring network cabinets, the ring network cabinet 1 is connected with an outdoor terminal area, a water tank section, a pipe arrangement section and a tunnel section are arranged on a connecting channel of the ring network cabinet and are used for simulating the environment of a distribution cable channel, and the outdoor terminal area is connected with a 10kV switch group through a terminal cabinet and a simulation cabinet; the ring main unit 2 is connected with a 10kV switch cabinet, and a direct-buried section and a plurality of cable defect boxes are arranged on a connecting channel of the ring main unit and are used for simulating the environment and the actual fault condition of a distribution cable channel.
The direct current cable line is connected with the 10kV switch cabinet through the outdoor terminal, and a plurality of cable defect boxes are arranged on a connecting channel of the direct current cable line and used for simulating the direct current fault condition of the distribution cable. The two cable channels are connected with the control room through tunnels, and the multi-loop cable is connected with the test equipment through a switch cabinet.
Based on the connection relation, the alternating current cable ring network channel is provided with a 2-circuit 10 kV/1-circuit 380V alternating current cable for partial discharge and fault location tests, a 1-circuit 10kV alternating current cable for temperature rise tests, and a 1-circuit 10kV alternating current cable for current-carrying capacity tests under cable intensive laying; the direct current cable channel is provided with a 2-circuit 10kV direct current cable for a partial discharge defect test; the working conditions of independent operation of a direct-current distribution cable, independent operation of an alternating-current distribution cable and mixed operation of the alternating-current and direct-current cables are simulated by controlling a 10kV switch cabinet.
The distribution cable test control system in the system comprises an outdoor test area and an indoor control console, various test equipment and monitoring devices are arranged in the outdoor test area, the indoor control console can control the various test equipment, so that various distribution cable true tests can be carried out, the monitoring devices are used for collecting operation data and environmental parameters of the distribution cables, and the distribution cable fault detection and positioning technology verification is carried out. The main components of the outdoor test area in the distribution cable test system comprise one or more of the following devices: the device comprises a box-type transformer, a medium-low voltage power distribution cabinet, a large-current cable temperature rise test device, a non-partial discharge power frequency withstand voltage test device, a medium-voltage cable control device, a cable fault positioning operation device and an off-line partial discharge detection device, wherein the box-type transformer and the medium-low voltage power distribution cabinet provide power for each test device, and each test device is used for simulating and changing test conditions and carrying out test operation. And the device is also provided with an operation parameter acquisition device, a tunnel environment monitoring device, an online partial discharge monitoring device and a reserved platform, and is used for acquiring operation data and environment parameters in a power distribution cable fault test.
The indoor control console in the distribution cable test control system changes test conditions to carry out various tests by controlling various test equipment and monitoring equipment, and collects various operation data and environmental parameters. The system mainly carries out one or more of the following tests, and the control method comprises the following steps:
the method comprises the steps that through controlling a cable defect box, rapidly replaceable simulated fault cables are arranged at different laying sections of the cables, distribution cable operation parameters and environment parameters under different fault states are collected, fault simulation and state detection tests of the distribution cables are carried out, normal cables and various typical cable fault short samples are arranged in the cable defect box, a cable switching automatic switch is arranged, and the automatic switch can control a cable node to switch between the normal cables and the cable fault short samples by adopting a PLC (programmable logic controller);
the method comprises the steps that power frequency high voltage is applied to three phases of a cable line by controlling non-partial-discharge power frequency voltage withstand test equipment, the local discharge amount of a distribution cable is detected, the running parameters and the environmental parameters of the distribution cable are collected, the power frequency voltage withstand test and the online partial discharge test of the distribution cable are carried out, the defect box of the distribution cable is controlled to set partial discharge defects in an offline state, the running parameters and the environmental parameters of the distribution cable are collected, and the offline partial discharge simulation test of the distribution cable is carried out;
by controlling the cable line water tank laying section, setting the cable water level depth, simulating the cable underwater operation environment, controlling a large-current cable temperature rise test device, applying current to heat a conductor to the conductor temperature during normal operation, collecting the operation parameters and environment parameters of a distribution cable, and carrying out a distribution cable and accessory waterproof capability test;
the current-carrying capacity test under the cable intensive laying condition is carried out by controlling the intensive laying section of the distribution cable, changing the cable intensive degree, controlling the temperature rise test equipment, changing the environmental temperature of the intensive laying section of the distribution cable, detecting the current-carrying capacity and temperature data of the distribution cable, collecting the operation parameters and environmental parameters of the distribution cable.
Meanwhile, the system requires that various test devices and the monitoring device are integrated with a wireless communication module, the indoor control console issues an operation instruction through the wireless communication module to control the switch and the operation parameters of each test device, remote control and switching can be realized in real time on the indoor control console, and the monitoring device uploads collected operation data and environment parameters to the cloud in real time through the wireless communication module.
Based on the constitution and the realization function of the true type test system for the distribution cable, fault inversion is carried out according to the data collected by the distribution cable under the true fault, the true fault working condition and the environment condition of the distribution cable are restored, and the fault sample data of the distribution cable is constructed.
The specific fault inversion method of the embodiment of the invention is as follows:
firstly, for a distribution cable test under a real fault, operation data and environmental parameters which can be collected by a monitoring device or a sensor comprise cable carrying capacity I, cable surface temperature T, environmental humidity H and partial discharge quantity Q, and mean water level depth l, cable laying density d and cable fault type of the fault cable in a water tank are measured and recorded. The cable current-carrying capacity I, the cable surface temperature T, the environment humidity H and the partial discharge capacity Q can be directly acquired through a monitoring device or a sensor, and the cable fault type can be judged through expert experience.
The method for calculating the average water level depth l of the cable comprises the following steps: if the total length of the distribution cable immersed in the water tank is L, taking the position of the cable entering the water tank as a starting point and the position of the cable discharging the water tank as an end point, establishing a coordinate axis X, setting m measuring points to be evenly distributed on the coordinate axis, namely measuring the depth of the water level of the cable once every L/m length, and setting the depth of the water level of the cable measured by each measuring point to be hiThe mean water level depth l of the cable is
The calculation formula of the cable laying density d is
Wherein NUM is the conductor number in the cable, and S is the cross-sectional area of distribution cable. And integrating the parameters and the fault types obtained by the acquisition and the measurement into a distribution cable fault data sample.
Then, based on the obtained distribution cable fault data sample, setting a comparison line in a test system, setting a cable mean water level depth l, a cable laying density d and an environment humidity H according to the fault data sample, acquiring a cable current-carrying capacity I ', a cable surface temperature T' and a local discharge quantity Q 'of a distribution cable running in the line through a monitoring device or a sensor, keeping the fault type unchanged, and adjusting l, d and H in the line to enable the I', T 'and Q' to meet the following conditions:
when the conditions are met, the fault inversion can be considered to be completed, and the reliable simulation of the real cable fault working condition and the real environment condition is realized.
Based on the distribution cable true test system and the fault inversion method, the distribution cable working condition under the true fault condition can be reproduced, various test conditions are changed, so that a distribution cable fault detection test is carried out, and the validity and accuracy of distribution cable fault detection and diagnosis are verified and evaluated by utilizing a distribution cable fault detection evaluation method according to the test result.
The distribution cable fault detection and evaluation method is used for evaluating the effectiveness and accuracy of the distribution cable fault detection method, and by constructing a distribution cable fault detection and evaluation index system, aiming at developing an experimental result of the distribution cable fault detection to be evaluated, a comprehensive evaluation level of the fault detection can be obtained, and as shown in fig. 3, the method can be specifically carried out according to the following steps:
TABLE 1 evaluation index grading of cable fault detection method
| Grade/index | C | P | T | Comprehensive evaluation |
| I | [0，20] | [0，20] | [0，20] | [0，20] |
| II | [20，40] | [20，40] | [20，40] | [20，40] |
| III | [40，60] | [40，60] | [40，60] | [40，60] |
| IV | [60，80] | [60，80] | [60，80] | [60，80] |
| V | [80，100] | [80，100] | [80，100] | [80，100] |
And 2, calculating a distribution cable fault detection accuracy score C, a distribution cable fault detection accuracy score P and a distribution cable fault detection rapidity score T by setting evaluation indexes of single fault detection test results, wherein the evaluation indexes comprise single fault type judgment accuracy C, single fault point position judgment accuracy P and single fault troubleshooting time T, and endowing scores according to the test results, the score rule of the single fault type judgment accuracy C is shown in a table 2, the score rule of the single fault point position judgment accuracy P is shown in a table 3, and the score rule of the single fault troubleshooting time T is shown in a table 4.
TABLE 2 scoring rules for Single Fault type discrimination accuracy c
| Accuracy c for judging fault type in single test | Scoring |
| Determine the correctness | 100 |
| Error in discrimination | 0 |
TABLE 3 scoring rules for secondary fault point location discrimination accuracy p
| Single test fault point position discrimination accuracy p | Scoring |
| Within 1 m | 100 |
| More than 1 m and within 10 m | 75 |
| More than 10 m and within 30 m | 50 |
| The content of the active carbon is more than 30,within 100 m | 25 |
| Over 100 m | 0 |
TABLE 4 score rule for single troubleshooting time t
| Troubleshooting time t of single test | Scoring |
| Within 1 hour | 100 |
| More than 1 hour and less than 5 hours | 75 |
| Over 5 hours and within 12 hours | 50 |
| Over 12 hours and within 24 hours | 25 |
| Over 24 hours | 0 |
Step 3, repeating the fault detection method test of the step 2 for N times, endowing each single fault detection test result evaluation index according to each test result, obtaining N groups of test result evaluation index fractional vectors, and recording the fractional vectors asRj＝(cj，pj，tj)，j∈[1，N]Wherein j represents the jth group of vectors, and N groups of vectors. Calculating a distribution cable fault detection accuracy score C, a distribution cable fault detection accuracy score P and a distribution cable fault detection rapidity score T of evaluation indexes of the distribution cable fault detection method according to N groups of test result evaluation index score vectors, and calculating by the following formulas:
and dividing intervals according to the evaluation index grade of the cable fault detection method determined in the step 1, and obtaining corresponding grades according to the intervals where the grades are located.
Step 4, endowing each evaluation index weight to the distribution cable fault detection method by adopting an analytic hierarchy process, and finally calculating to obtain a comprehensive evaluation grade of the distribution cable fault detection method, wherein the specific method comprises the following steps:
firstly, determining evaluation grades of a distribution cable fault detection method as a target layer, taking each evaluation index accuracy score C, accuracy score P and rapidity score T of the distribution cable fault detection method as a criterion layer, and comprehensively evaluating each grade of the distribution cable fault detection method determined in the step 1 as a scheme layer to construct a multi-layer structure;
then, a judgment matrix is constructed by a consistent matrix method, and experts compare every two evaluation indexes of the distribution cable fault detection method according to importance to finally obtain a judgment matrix A, wherein the specific form is
Wherein a isijThe specific determination method for judging the scale of the matrix is shown in table 5.
TABLE 5 determination of the Scale of the decision matrix
| Scale | Means of |
| 1 | Showing the same importance of the two factors compared |
| 3 | Indicating that one factor is slightly more important than the other factor when compared to the other factor |
| 5 | Indicating a comparison of two factors, one factor over the otherOf obvious importance |
| 7 | Indicating a comparison of two factors, one factor over the otherOf strong importance |
| 9 | Indicating that one factor is extremely important compared to the |
| 2，4，6，8 | Median value of the above two adjacent judgments |
| Reciprocal of the | Factor i to j ratioThe judgment of the comparison and the judgment of the comparison of the factor j to the factor i are reciprocal to each other |
Finally, solving the eigenvector of the maximum characteristic root lambda max of the judgment matrix, and normalizing the eigenvector to obtain a vector W (omega) ═ omega1，ω2，ω3) Satisfy the following requirements
r represents the r-th evaluation index, and n is the total index number. Then ω in the feature vectorrI.e. as the weight of the r-th index.
The simultaneous determination of the construction of the matrix requires that the consistency check be satisfied, i.e. that the consistency ratio CR < 0.1, where CR is satisfied by the consistency ratio
Wherein CI is consistency index, and the specific calculation formula is
RI is a random consistency index, and the specific numerical value changes with the number n of the evaluation indexes and can be obtained by looking up a table in table 6.
TABLE 6. random consistency index look-up table
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| RI | 0 | 0 | 0.58 | 0.9 | 1.12 | 1.24 | 1.32 | 1.41 | 1.45 | 1.49 | 1.51 |
If the consistency check is not passed, the matrix is judged to be reconstructed.
And (3) carrying out weighted calculation according to the obtained index weights and the index score values determined in the step (3) to finally obtain the comprehensive score value of the distribution cable fault detection method, and determining the comprehensive evaluation level of the distribution cable fault detection method according to the section where the comprehensive evaluation level is located, wherein the comprehensive evaluation level is used for evaluating the accuracy and the effectiveness of the technology.
In summary, the invention provides a true simulation test system for a complex environment of a distribution cable based on multi-dimensional digital fault inversion and an application method thereof, establishes a simulation test system composed of a typical laying mode of the distribution cable and a real complex operation environment, and develops a true test system for accurately simulating and synchronously reproducing multiple state quantities of a cable line. The operation state of the cable under the abnormal working condition in the true cable test system is simulated and reproduced, the operation state comprises cable body defects, fault working condition simulation and combination simulation of the fault working condition simulation and various complex channel environment factors, tests aiming at the fault working condition and the operation performance of the distribution cable under various complex conditions are carried out, high-precision multi-dimensional digital inversion is carried out on fault sample data collected in a true cable network, therefore, the fault state and the environment condition of the distribution cable are reproduced to the maximum extent, verification and evaluation are carried out aiming at the effectiveness and the accuracy of the distribution cable fault detection method under the true fault, and comprehensive evaluation of the distribution cable fault detection method is achieved. The real complex cable channel of the medium-low voltage alternating current and direct current distribution network is constructed and restored, the real physical environment and various electrical environments are restored to the maximum extent, multi-angle analysis under various test conditions is achieved, and the requirements of cable fault positioning, verification of effectiveness and accuracy of a new state detection technology, function and performance evaluation of new equipment and the like are met.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (9)
1. A distribution cable true model test system based on multi-dimensional digital fault inversion is characterized by comprising:
the distribution cable channel simulation system is used for simulating a real distribution cable laying mode, an operation environment and a fault condition and reproducing the working condition of the distribution cable under the actual operation condition;
the distribution cable test control system is used for developing various distribution cable true tests according to the simulation environment of the distribution cable channel simulation system and verifying the distribution cable fault detection and diagnosis technology under different test conditions;
wherein the distribution cable channel simulation system comprises: the system comprises a ring main unit, a water tank section, a pipe arrangement section, a tunnel section, a direct-buried section, an alternating current-direct current hybrid cable channel, an outdoor terminal area, a terminal cabinet, a switch cabinet, a cable defect box and a plurality of work wells, wherein the distribution cable laying mode is changed by controlling and combining all sections of the distribution cable channel, and various faults are set at different positions through the cable defect box to construct the fault state of the distribution cable;
the distribution cable test control system comprises: outdoor test area and indoor control console; the outdoor test area is provided with various test devices and monitoring devices, the indoor control console carries out various distribution cable true tests by operating the various test devices, and the monitoring devices acquire the operation data and environmental parameters of the distribution cable to carry out the verification of the distribution cable fault detection and positioning technology;
wherein, alternating current-direct current series-parallel connection cable channel includes: an AC cable ring network channel and a DC cable channel;
the alternating current cable looped network channel comprises:
2-circuit 10 kV/1-circuit 380V alternating current cable for partial discharge and fault location tests; wherein, the 1-circuit 10kV alternating current cable is used for a temperature rise test; the other 1-time 10kV alternating-current cable is used for carrying capacity test under the condition of cable dense laying;
the direct current cable channel includes:
2-circuit 10kV direct current cable for partial discharge defect test;
wherein, two cable channels pass through tunnel connection with indoor control cabinet, and many times cable passes through the cubical switchboard and is connected with test equipment.
2. The system of claim 1, wherein the ac cable loop network channel comprises: the first ring main unit and the second ring main unit;
the first ring main unit is connected with the outdoor terminal area, and the connecting channel is provided with a water tank section, a pipe arrangement section and a tunnel section and is used for simulating the environment of a distribution cable channel; the outdoor terminal area is connected with the simulation cabinet and the 10kV switch group through the terminal cabinet;
the second ring network cabinet is connected with the 10kV switch cabinet, and a direct-buried section and a plurality of cable defect boxes are arranged on the connecting channel and used for simulating the distribution cable channel environment and the actual fault condition;
the direct-current cable is connected with the 10kV switch cabinet through the outdoor terminal, and a plurality of cable defect boxes are arranged on the connecting channel and used for simulating the direct-current fault condition of the distribution cable;
the working conditions of independent operation of the direct-current distribution cable, independent operation of the alternating-current distribution cable and mixed operation of the alternating-current and direct-current cables can be simulated by controlling the 10kV switch cabinet.
3. The distribution cable true model testing system based on multi-dimensional digital fault inversion according to claim 1,
the outdoor test area comprises one or more of a box-type transformer, a medium-low voltage power distribution cabinet, a cable temperature rise test device, a non-partial discharge power frequency withstand voltage test device, a medium-voltage cable control device, a cable fault positioning operation device and an offline partial discharge detection device; the box-type transformer and the medium-low voltage power distribution cabinet are used for providing power for each test device, and each test device is used for simulating and changing test conditions and carrying out test operation;
the monitoring device arranged in the outdoor test area comprises an operating parameter acquisition device, a tunnel environment monitoring device and an online partial discharge monitoring device, and is used for acquiring operating data and environmental parameters in a power distribution cable fault test.
4. The distribution cable true test system based on multi-dimensional digital fault inversion of claim 1, wherein a normal cable and various typical cable fault short samples are arranged in the cable defect box, and an automatic cable switching switch is arranged; the automatic switch adopts a PLC to control a cable node to switch between a normal cable and a cable fault short sample.
5. The distribution cable true test system based on multi-dimensional digital fault inversion according to claim 1, wherein wireless communication modules are integrated in all types of test equipment and monitoring devices; the indoor control console issues an operation instruction through the wireless communication module to control the switch and the operation parameters of each test device, and the monitoring device uploads the collected operation data and the environmental parameters through the wireless communication module.
6. The application method of the distribution cable true test system based on the multi-dimensional digital fault inversion, which is disclosed by claim 1, is used for evaluating a distribution cable fault detection method, and comprises the following specific steps:
step 1, determining a distribution cable fault detection evaluation index, comprising: the method comprises the following steps of (1) distributing cable fault detection accuracy score C, distributing cable fault detection accuracy score P and distributing cable fault detection rapidity score T; grading the cable fault detection evaluation indexes;
step 2, establishing evaluation indexes of single fault detection test results, comprising the following steps: the method comprises the following steps of (1) judging accuracy c of a single fault type, judging accuracy p of a single fault point position and single fault troubleshooting time t; selecting a corresponding fault simulation test project according to a fault detection method to be verified and evaluated; after a fault simulation test project is started, the fault type and the fault point position are checked by a distribution cable fault detection method to be verified and evaluated to obtain a test result, and a score is given according to the test result;
step 3, changing the position or the fault type of the fault of the distribution cable, and repeating the evaluation of the fault detection method in the step 2 for N times to obtain N groups of test result evaluation index fractional vectors; calculating an accuracy score C, an accuracy score P and a rapidity score T of evaluation indexes of the power distribution cable fault detection method according to the obtained vector group, and determining the grade of each index;
and 4, endowing weighted values to all evaluation indexes of the distribution cable fault detection method to be verified and evaluated by an analytic hierarchy process, comprehensively calculating to obtain a comprehensive evaluation score of the distribution cable fault detection method to be verified and evaluated, and determining a comprehensive evaluation grade.
7. The method of application of claim 6, wherein the step of multi-dimensional digital fault inversion comprises:
step 1, carrying out various tests based on the distribution cable under the real fault, acquiring the operation data and environmental parameters of the distribution cable, and constructing and obtaining the fault sample data of the distribution cable; the electrical cable fault sample data includes: cable carrying capacity, cable surface temperature, environment humidity and local discharge capacity, cable mean water level depth of a water tank laying section, cable laying density and cable fault types set in a cable defect box;
and 2, setting a comparison line based on the distribution cable fault sample data obtained in the step 1, keeping the cable fault type in the cable defect box unchanged, obtaining the environmental humidity by controlling and changing the cable mean water level depth and the cable laying density, monitoring the cable current-carrying capacity, the cable surface temperature and the local discharge capacity of the distribution cable running in the line until the acquired data and the data in the obtained fault sample data are kept in a preset error range, and completing fault inversion.
8. The method of claim 7, wherein in step 1 of multi-dimensional digital fault inversion, the various types of tests performed include one or more of the following:
the control cable defect box is provided with replaceable simulated fault cables at different laying sections of the cable, collects distribution cable operation parameters and environment parameters under different fault states, and carries out distribution cable fault simulation and state detection tests;
controlling non-partial discharge power frequency voltage withstand test equipment, applying power frequency high voltage to three phases of a cable line, detecting the local discharge amount of a distribution cable, collecting operation parameters and environmental parameters of the distribution cable, and carrying out a power frequency voltage withstand test and an online partial discharge test of the distribution cable; in an off-line state, controlling a cable defect box to set a partial discharge defect, collecting operation parameters and environment parameters of a distribution cable, and carrying out an off-line partial discharge simulation test of the distribution cable;
controlling a cable line water tank laying section, setting a cable water level depth, simulating a cable underwater operation environment, controlling a cable temperature rise test device, applying current to heat a conductor to a conductor temperature during normal operation, collecting operation parameters and environment parameters of a distribution cable, and carrying out a distribution cable and accessory waterproof capability test;
the method comprises the steps of controlling the intensive laying section of the distribution cable, changing the intensive degree of the cable, controlling temperature rise test equipment, changing the environmental temperature of the intensive laying section of the distribution cable, detecting the current-carrying capacity and temperature data of the distribution cable, collecting the operation parameters and environmental parameters of the distribution cable, and carrying out the current-carrying capacity test under the intensive laying condition of the cable.
9. The application method of the distribution cable true test system based on the multi-dimensional digital fault inversion, which is disclosed by claim 1, is used for evaluating a distribution cable fault detection method, and comprises the following specific steps:
in the step 1, the evaluation indexes of the cable fault detection method are graded as follows,
The method comprises the following steps that C is used for representing the fault type judgment correctness and mistakes of the distribution cable, P is used for representing the difference between the judgment position of a fault point and the actual position, and T is used for representing the size of troubleshooting time;
in step 2, the scoring rule of the single fault type judging accuracy c is as follows,
；
The scoring rule of the single fault point position discrimination accuracy p is,
；
The scoring rule for the single troubleshooting time t is,
；
In step 3, the obtained N groups of test result evaluation index score vectors are recorded as Rj＝(cj，pj，tj)，j∈[1，N](ii) a Wherein j represents the jth group of vectors, and N groups of vectors are total;
calculating a distribution cable fault detection accuracy score C, a distribution cable fault detection accuracy score P and a distribution cable fault detection rapidity score T of evaluation indexes of the distribution cable fault detection method according to N groups of test result evaluation index score vectors, wherein the calculation expression is as follows:
dividing intervals according to the evaluation index grades of the cable fault detection method determined in the step 1, and obtaining corresponding grades according to the intervals where the grades are located;
in step 4, the specific method for giving each evaluation index weight to the distribution cable fault detection method by adopting an analytic hierarchy process and finally calculating to obtain the comprehensive evaluation grade of the distribution cable fault detection method comprises the following steps:
firstly, determining evaluation grades of a distribution cable fault detection method as a target layer, taking each evaluation index accuracy score C, accuracy score P and rapidity score T of the distribution cable fault detection method as a criterion layer, and comprehensively evaluating each grade of the distribution cable fault detection method determined in the step 1 as a scheme layer to construct a multi-layer structure;
then, a judgment matrix is constructed by a consistent matrix method, each evaluation index of the distribution cable fault detection method is compared pairwise according to importance to obtain a judgment matrix A, expressed as,
wherein, aijTo determine the scale of the matrix, the determination method is,
；
Solving the eigenvector of the maximum characteristic root lambda max of the judgment matrix, normalizing the eigenvector to obtain a vector W (omega) ═ omega1，ω2，ω3) Satisfy the following requirements
r represents the r-th evaluation index, and n is the total index number; ω in the feature vectorrA weight as an r-th index;
wherein the consistency ratio CR of the judgment matrix is less than 0.1,
RI is a random consistency index, and the lookup table is,
；
if the consistency check is not passed, the judgment matrix is reconstructed.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08122398A (en) * | 1994-10-28 | 1996-05-17 | Mitsubishi Electric Corp | Fault diagnostic system |
| CN109375056A (en) * | 2018-10-19 | 2019-02-22 | 国网浙江省电力有限公司电力科学研究院 | Distribution broken string is grounded live test loop and fault simulation platform and test method |
| CN109669103A (en) * | 2017-10-13 | 2019-04-23 | 中国电力科学研究院 | A kind of polymorphic complex fault analogue test platform of true type power distribution network and test method |
| CN110609202A (en) * | 2019-10-14 | 2019-12-24 | 河北旭辉电气股份有限公司 | 10-66kV distribution network intermittent arc light grounding true-mode simulation test device |
-
2020
- 2020-12-02 CN CN202011392029.0A patent/CN112557962B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08122398A (en) * | 1994-10-28 | 1996-05-17 | Mitsubishi Electric Corp | Fault diagnostic system |
| CN109669103A (en) * | 2017-10-13 | 2019-04-23 | 中国电力科学研究院 | A kind of polymorphic complex fault analogue test platform of true type power distribution network and test method |
| CN109375056A (en) * | 2018-10-19 | 2019-02-22 | 国网浙江省电力有限公司电力科学研究院 | Distribution broken string is grounded live test loop and fault simulation platform and test method |
| CN110609202A (en) * | 2019-10-14 | 2019-12-24 | 河北旭辉电气股份有限公司 | 10-66kV distribution network intermittent arc light grounding true-mode simulation test device |
Non-Patent Citations (1)
| Title |
|---|
| "一种配电自动化真型综合验证测试平台的结构方案研究";任正某等;《电子测试》;20190731;全文 * |
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