CN112952998B - Distribution network circuit fault positioning protection method based on station transformer metering technology - Google Patents
Distribution network circuit fault positioning protection method based on station transformer metering technology Download PDFInfo
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- CN112952998B CN112952998B CN202110068945.7A CN202110068945A CN112952998B CN 112952998 B CN112952998 B CN 112952998B CN 202110068945 A CN202110068945 A CN 202110068945A CN 112952998 B CN112952998 B CN 112952998B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a distribution network circuit fault positioning protection method based on a station transformer metering technology, which is characterized in that the station transformer metering data are applied to a distribution network automation system, collected station transformer remote signaling and remote measurement signals are analyzed, fault positioning and load transfer work are carried out by distribution network dispatching personnel, specific station transformer and line positions are rapidly positioned, and on the other hand, the self-healing type pre-interrupter is adopted to communicate power transmission between a station transformer terminal and a power output terminal, so that when the station transformer terminal fails, the self-healing type pre-interrupter automatically breaks power transmission to the power output terminal, and when the station transformer terminal returns to normal, the power transmission is automatically restored, thereby not only effectively protecting the power utilization safety of a line, but also relieving the work of the distribution network dispatching personnel and guaranteeing the safety and timeliness of the power utilization of the line.
Description
Technical Field
The invention relates to the field of distribution network circuits, in particular to a distribution network circuit fault positioning protection method based on a transformer metering technology.
Background
The 10kV distribution network line mainly adopts a tree structure, has the characteristics of long line, multiple branches and the like, is easy to fail, and can influence other non-failure areas after the failure occurs. Therefore, in order to reduce the occurrence rate of faults, the operation of a non-fault area is affected after the occurrence of faults, a method for configuring a switch on a column is adopted, the fault is isolated immediately after the occurrence of the faults, a fault section is found out, and basis is provided for basic work such as line maintenance and the like, so that the purpose of shortening the power failure time is achieved.
The single transformer breaks down, a dispatcher cannot find out in time, and a fault point cannot be located and isolated in time, so that the power failure time is too long, the power supply reliability and the customer satisfaction are affected, and meanwhile, on-site line inspection personnel conduct full line inspection, so that the pressure is very high.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a distribution network circuit fault positioning protection method based on a station transformer metering technology, which is characterized in that the station transformer metering data is applied to a distribution network automation system, collected station transformer remote signaling and remote measuring signals are analyzed on one hand, a distribution network dispatcher is assisted to perform fault positioning and load transfer work, a specific station transformer and a line position are positioned quickly, and on the other hand, a self-healing pre-interrupter is adopted to communicate power transmission between a station transformer terminal and a power output terminal, so that when the station transformer terminal fails, the self-healing pre-interrupter automatically breaks power transmission to the power output terminal, and when the station transformer terminal returns to normal, the power transmission is automatically recovered, thereby not only effectively protecting the power safety of the line, but also reducing the work of the distribution network dispatcher and guaranteeing the safety and timeliness of the power utilization of the line.
In order to solve the problems, the invention adopts the following technical scheme:
a distribution network circuit fault location protection method based on a station transformer metering technology comprises the following steps:
s1: the power output by the station transformer terminal is transmitted to the power output terminal through the self-healing pre-breaker, and in the process, the remote signaling quantity and the remote sensing quantity of the station transformer terminal are collected in real time through the station transformer metering collection device;
s2: the station transformer metering acquisition device stores acquired data, screens out effective remote signaling and remote measuring signals and reports the signals to the distribution network automation system, the distribution network automation system combines station transformer information with single line drawing upper station variable data to infer fault information of the station transformer and the line, and the station transformer power point tracking system is used for positioning the specific station transformer and the line;
s3: the self-healing type pre-breaker receives the electric energy transmitted by the station transformer terminal, when the transmission voltage and the current are overlarge and exceed the allowable transmission maximum value of the self-healing type pre-breaker, the self-healing type pre-breaker automatically breaks, the electric energy transmission between the station transformer terminal and the electric power output terminal is interrupted, and when the voltage and the current received by the self-healing type pre-breaker recover to normal values, the self-healing type pre-breaker is reclosed, and the transmission of electric power is recovered.
According to the invention, on one hand, the station transformer metering data are applied to the distribution network automation system, the collected station transformer remote signaling and remote sensing signals are analyzed, the fault positioning and load transfer work is carried out by the distribution network dispatcher, the specific station transformer and the line position at the position are rapidly positioned, and on the other hand, the self-healing pre-interrupter is adopted to communicate the power transmission between the station transformer terminal and the power output terminal, so that when the station transformer terminal fails, the self-healing pre-interrupter automatically breaks the power transmission to the power output terminal, and when the station transformer terminal returns to normal, the power transmission is automatically restored, the line power safety is effectively protected, the work of the distribution network dispatcher is lightened, and the safety and timeliness of the line power use are ensured.
Further, the station transformer metering acquisition device is connected with a station transformer metering database and a data reporting system, the data reporting system is connected with a distribution network automation system, the distribution network automation system is connected with station transformer single line diagram data and a fault analysis system, the fault analysis system is connected with a station transformer power supply point tracking system, the station transformer metering acquisition device comprises a remote signaling acquisition system and a remote sensing system, remote signaling and remote sensing signals of a station transformer terminal can be acquired through the station transformer metering acquisition device, meanwhile, effective abnormal signals are screened out and transmitted to the distribution network automation system, and the distribution network automation system can rapidly discover and locate faults through state changes of information quantity.
Further, the station transformer metering database is connected with a GIS system, the GIS system is connected with a distribution network OCS system, the distribution network OCS system is connected with a station transformer load rate display system, and the station transformer current load rate can be displayed for work reference of distribution network dispatcher by adding station transformer parameters into the distribution network OCS system through the GIS system.
Furthermore, the station transformer metering database is also connected with a line loss calculation system, and the line loss calculation system can automatically calculate all station data of the line according to metering acquisition data, compares the station variable data with a corresponding outlet switch of a transformer substation, calculates line loss and provides reference for distribution network scheduling personnel.
Furthermore, the data reporting system is also connected with a reporting verification feedback system, the reporting verification feedback system is connected with the station transformer single line diagram data, whether the metering data are reported or not is verified according to the real power failure condition of the line, unreported station transformer is fed back to metering personnel, whether the metering reporting data are wrong or not is verified according to the metering alarm time and the real power failure condition, wrong information is fed back to the metering personnel, and the reliability of the station transformer data is improved.
Furthermore, the distribution network automation system is also connected with a live topology system, the live topology system is connected with a switch system, the power supply station change area of the switch system can be checked through the live topology system, and a dispatcher can be used for arranging power failure, load transfer and customer service personnel to quickly inform users in the power failure area of making system support.
Further, the self-healing pre-interrupter comprises a main joint and an auxiliary joint which are matched with each other, the main joint is connected with a station transformer terminal through a main wire, the auxiliary joint is connected with an electric power output terminal through an auxiliary wire, one ends of the main joint and the auxiliary joint, which are close to each other, are respectively fixedly connected with a main magnetic ring and an auxiliary magnetic ring, one ends of the main magnetic ring and the auxiliary magnetic ring, which are close to each other, are opposite poles, an electromagnet is fixedly connected to the inside of the auxiliary joint, a pair of limit belts are fixedly connected between the main joint and the auxiliary joint, the limit belts are positioned on the inner side of the main magnetic ring, when the electromagnet passes through, repulsive magnetic force exists between the electromagnet and the main magnetic ring, electric energy between the station transformer terminal and the electric power output terminal can be normally transmitted when the main joint and the auxiliary joint are in a normal connection state, connection stability of the main joint and the auxiliary joint can be ensured through magnetic attraction between the main magnetic ring and the auxiliary joint, when the station transformer terminal transmits voltage and the current are overlarge and the self-healing pre-interrupter allow maximum transmission, current flowing through the electromagnet is increased, the electromagnet is easy to be increased, repulsive magnetic force is generated between the main joint and the auxiliary joint can be completely separated from the main joint, and the electric power output terminal can be completely separated from the main joint and the auxiliary joint through the main joint, and the electric power can be completely separated from the main joint and the auxiliary terminal, and the electric power can be conveniently realized.
Further, the reservoir has been seted up to the inside of main joint, the fluid channel has been seted up to the one end that the reservoir is close to the sub-joint, fluid channel's inboard is equipped with the ejector pad, fixedly connected with flexible bag between the side of ejector pad and the fluid channel inner wall, the magnetic fluid has all been filled to the inside of reservoir and fluid channel, the magnetic fluid is located the ejector pad and keeps away from the one side of sub-joint, and when the magnetic field of electro-magnet strengthens, and the attraction of electro-magnet to the magnetic fluid also strengthens, drives the magnetic fluid and is close to the sub-joint, promotes the ejector pad and causes outside extrusion to the sub-joint, further promotes the separation between main joint and the sub-joint, realizes the automatic disconnection between main joint and the sub-joint.
Further, the one end fixedly connected with spacing stick that sub-joint was kept away from to the ejector pad, fluid channel's inboard is equipped with spacing, spacing includes the annular plate, fixedly connected with a plurality of evenly distributed's branch between annular plate outer end and the fluid channel inner wall, spacing stick sliding connection is in the inside of annular plate, uses through spacing and spacing stick's cooperation, can play spacing effect to the ejector pad, and when bench transformer terminal current resumes normal, the electro-magnet magnetic field weakens, under the magnetic force effect of main magnetic ring and sub-magnetic ring, and main joint and sub-joint reconnection to promote the ejector pad to move along the straight line back into fluid channel of moving track.
Compared with the prior art, the invention has the advantages that:
(1) According to the scheme, on one hand, the station transformer metering data are applied to the distribution network automation system, collected station transformer remote signaling and remote measurement signals are analyzed, the distribution network dispatcher is assisted to perform fault positioning and load transfer work, a specific station transformer and a line position are rapidly positioned, on the other hand, the self-healing pre-interrupter is adopted to communicate power transmission between the station transformer terminal and the power output terminal, when the station transformer terminal breaks down, the self-healing pre-interrupter automatically breaks off power transmission to the power output terminal, and when the station transformer terminal returns to normal, the transmission of the power is automatically restored, so that the line power safety is effectively protected, the work of the distribution network dispatcher is lightened, and the safety and timeliness of the line power are guaranteed.
(2) The station transformer metering acquisition device is connected with a station transformer metering database and a data reporting system, the data reporting system is connected with a distribution network automation system, the distribution network automation system is connected with station transformer single line diagram data and a fault analysis system, the fault analysis system is connected with a station transformer power supply point tracking system, the station transformer metering acquisition device comprises a remote signaling acquisition system and a remote sensing system, the remote signaling and remote sensing signals of a station transformer terminal can be acquired through the station transformer metering acquisition device, meanwhile, effective abnormal signals are screened out and transmitted to the distribution network automation system, and the distribution network automation system can quickly discover and locate faults through state change of information quantity.
(3) The station transformer metering database is connected with a GIS system, the GIS system is connected with a distribution network OCS system, the distribution network OCS system is connected with a station transformer load rate display system, and the station transformer current load rate can be displayed for work reference of distribution network dispatcher by adding station transformer parameters into the distribution network OCS system through the GIS system.
(4) The station transformer metering database is also connected with a line loss calculation system, and the line loss calculation system can automatically calculate all station data of the line according to metering acquisition data, compares the station data with a corresponding outlet switch of a transformer substation, calculates line loss and provides reference for distribution network scheduling personnel.
(5) The data reporting system is also connected with a reporting verification feedback system, the reporting verification feedback system is connected with the station transformer single line diagram data, whether the metering data are reported or not is verified according to the real power failure condition of the line, the unreported station transformer is fed back to the metering personnel, whether the metering reporting data are wrong or not is verified according to the metering alarm time and the real power failure condition, the wrong information is fed back to the metering personnel, and the reliability of the station transformer data is improved.
(6) The distribution network automation system is also connected with a live topology system, the live topology system is connected with a switch system, the power supply station change area of the switch system can be checked through the live topology system, and power failure, load transfer and customer service personnel are rapidly notified to users in the power failure area for making system support.
(7) The self-healing type pre-breaker comprises a main joint and an auxiliary joint which are matched with each other, when the main joint and the auxiliary joint are in a normal connection state, electric energy between a transformer terminal and an electric power output terminal can be normally transmitted, an electricity utilization client can be normally used, the connection stability of the main joint and the auxiliary joint can be ensured through magnetic attraction between a main magnetic ring and an auxiliary magnetic ring, when the transmission voltage and the current of the transformer terminal exceed the allowable transmission maximum value of the self-healing type pre-breaker, the current flowing through an electromagnet is increased similarly, the magnetic field generated by the electromagnet is enhanced, the repulsive force of the electromagnet on the main magnetic ring is enhanced, the main joint and the auxiliary joint are forced to be separated from each other, the electric energy transmission between the transformer terminal and the electric power output terminal is interrupted, the main joint and the auxiliary joint can be ensured to be not to be easily separated completely through a limiting belt, and the automatic recovery connection between the main joint and the auxiliary joint is facilitated.
(8) The inside of main joint has seted up the reservoir, the fluid channel has been seted up to the one end that the reservoir is close to the sub-joint, the inboard of fluid channel is equipped with the ejector pad, fixedly connected with flexible bag between the side of ejector pad and the fluid channel inner wall, the magnetic fluid is all filled to the inside of reservoir and fluid channel, the magnetic fluid is located the ejector pad and is kept away from one side of sub-joint, when the magnetic field reinforcing of electro-magnet, the attraction of electro-magnet to the magnetic fluid also strengthens, drive the magnetic fluid to be close to the sub-joint, the ejector pad is promoted to cause outwards extrudeing to the sub-joint, further promote the separation between main joint and the sub-joint, realize the automatic disconnection between main joint and the sub-joint.
(9) The one end fixedly connected with spacing stick that sub-joint was kept away from to the ejector pad, fluid channel's inboard is equipped with the spacing, and the spacing includes the annular plate, fixedly connected with a plurality of evenly distributed's branch between annular plate outer end and the fluid channel inner wall, and spacing stick sliding connection is in the inside of annular plate, uses through the cooperation of spacing and spacing stick, can play spacing effect to the ejector pad, and when bench becomes terminal current to resume normal, the electro-magnet field weakens, under the magnetic force effect of main magnetic ring and sub-magnetic ring, and main joint and sub-joint reconnection to promote the ejector pad along the straight line back flow path of moving track in.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, in which:
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a schematic view of a partial structure of the self-healing pre-interrupter of the present invention when normally connected;
FIG. 3 is a schematic diagram of the structure shown at A in FIG. 2;
FIG. 4 is a schematic view of a partial front structure of the magnetic fluid of the present invention when the magnetic fluid is moving;
FIG. 5 is a schematic view of a partial structure of the self-healing pre-interrupter of the present invention when disconnected;
fig. 6 is a schematic side view of a limiting frame according to the present invention.
The reference numerals in the figures illustrate:
the device comprises a main wire 1, a main joint 2, a liquid storage tank 201, a fluid channel 202, an auxiliary joint 3, an auxiliary wire 4, a main magnetic ring 5, an auxiliary magnetic ring 6, a pushing block 7, a telescopic bag 8, a limit frame 9, a ring plate 91, a support rod 92, a limit rod 10, a limit belt 11 and an electromagnet 12.
Detailed Description
The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only a few embodiments of the present invention; but not all embodiments, are based on embodiments in the present invention; all other embodiments obtained by those skilled in the art without undue burden; all falling within the scope of the present invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between 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.
Referring to fig. 1, the method for positioning and protecting the fault of the distribution network circuit based on the transformer metering technology of the invention comprises the following steps:
s1: the power output by the station transformer terminal is transmitted to the power output terminal through the self-healing pre-breaker, and in the process, the remote signaling quantity and the remote sensing quantity of the station transformer terminal are collected in real time through the station transformer metering collection device;
s2: the station transformer metering acquisition device stores acquired data, screens out effective remote signaling and remote measuring signals and reports the signals to the distribution network automation system, the distribution network automation system combines station transformer information with single line drawing upper station variable data to infer fault information of the station transformer and the line, and the station transformer power point tracking system is used for positioning the specific station transformer and the line;
s3: the self-healing type pre-breaker receives the electric energy transmitted by the station transformer terminal, when the transmission voltage and the current are overlarge and exceed the allowable transmission maximum value of the self-healing type pre-breaker, the self-healing type pre-breaker automatically breaks, the electric energy transmission between the station transformer terminal and the electric power output terminal is interrupted, and when the voltage and the current received by the self-healing type pre-breaker recover to normal values, the self-healing type pre-breaker is reclosed, and the transmission of electric power is recovered.
The station transformer metering acquisition device is connected with a station transformer metering database and a data reporting system, the data reporting system is connected with a distribution network automation system, the distribution network automation system is connected with station transformer single line diagram data and a fault analysis system, the fault analysis system is connected with a station transformer power supply point tracking system, the station transformer metering acquisition device comprises a remote signaling acquisition system and a remote sensing system, the remote signaling and remote sensing signals of a station transformer terminal can be acquired through the station transformer metering acquisition device, meanwhile, effective abnormal signals are screened out and transmitted to the distribution network automation system, and the distribution network automation system can quickly discover and locate faults through state change of information quantity.
The station transformer metering database is connected with a GIS system, the GIS system is connected with a distribution network OCS system, the distribution network OCS system is connected with a station transformer load rate display system, and the station transformer current load rate can be displayed for work reference of distribution network dispatcher by adding station transformer parameters into the distribution network OCS system through the GIS system.
The station transformer metering database is also connected with a line loss calculation system, and the line loss calculation system can automatically calculate all station data of the line according to metering acquisition data, compares the station data with a corresponding outlet switch of a transformer substation, calculates line loss and provides reference for distribution network scheduling personnel.
The data reporting system is also connected with a reporting verification feedback system, the reporting verification feedback system is connected with the station transformer single line diagram data, whether the metering data are reported or not is verified according to the real power failure condition of the line, the unreported station transformer is fed back to the metering personnel, whether the metering reporting data are wrong or not is verified according to the metering alarm time and the real power failure condition, the wrong information is fed back to the metering personnel, and the reliability of the station transformer data is improved.
The distribution network automation system is also connected with a live topology system, the live topology system is connected with a switch system, the power supply station change area of the switch system can be checked through the live topology system, and power failure, load transfer and customer service personnel are rapidly notified to users in the power failure area for making system support.
Referring to fig. 2, the self-healing pre-interrupter includes a main joint 2 and an auxiliary joint 3 matched with each other, the main joint 2 is connected with a transformer terminal through a main wire 1, the auxiliary joint 3 is connected with a power output terminal through an auxiliary wire 4, one ends of the main joint 2 and the auxiliary joint 3, which are close to each other, are respectively and fixedly connected with a main magnetic ring 5 and an auxiliary magnetic ring 6, one ends of the main magnetic ring 5 and the auxiliary magnetic ring 6, which are close to each other, are heteropolar, an electromagnet 12 is fixedly connected inside the auxiliary joint 3, a pair of limit belts 11 are fixedly connected between the main joint 2 and the auxiliary joint 3, the limit belts 11 are positioned inside the main magnetic ring 5, when the electromagnet 12 has current to pass through, repulsive magnetic force acts between the electromagnet 12 and the main magnetic ring 5, when the main joint 2 and the auxiliary joint 3 are in a normal connection state, the electric energy between the station transformer terminal and the electric power output terminal can be normally transmitted, the electric power utilization client can normally utilize electricity, the connection stability of the main joint 2 and the auxiliary joint 3 can be ensured through the magnetic attraction between the main magnetic ring 5 and the auxiliary magnetic ring 6, when the transmission voltage and the current of the station transformer terminal exceed the allowable transmission maximum value of the self-healing pre-interrupter, the current flowing through the electromagnet 12 is increased, the magnetic field generated by the electromagnet 12 is enhanced, the repulsive force of the electromagnet 12 to the main magnetic ring 5 is enhanced, the main joint 2 and the auxiliary joint 3 are forced to be separated from each other, the electric energy transmission between the station transformer terminal and the electric power output terminal is interrupted, the main joint 2 and the auxiliary joint 3 can be ensured to be not to be easily separated completely through the limiting belt 11, and the automatic recovery connection between the main joint 2 and the auxiliary joint 3 is convenient.
Referring to fig. 3 and 4, a liquid storage tank 201 is provided in the main joint 2, a fluid channel 202 is provided at one end of the liquid storage tank 201 near the auxiliary joint 3, a push block 7 is provided at the inner side of the fluid channel 202, a flexible bag 8 is fixedly connected between the side end of the push block 7 and the inner wall of the fluid channel 202, the magnetic fluid is filled in the liquid storage tank 201 and the fluid channel 202, the magnetic fluid is located at one side of the push block 7 far away from the auxiliary joint 3, when the magnetic field of the electromagnet 12 is enhanced, the attraction of the electromagnet 12 to the magnetic fluid is also enhanced, the magnetic fluid is driven to approach the auxiliary joint 3, the push block 7 is pushed to extrude the auxiliary joint 3 outwards, the separation between the main joint 2 and the auxiliary joint 3 is further promoted, the automatic disconnection between the main joint 2 and the auxiliary joint 3 is realized, the one end fixedly connected with spacing stick 10 that sub-joint 3 was kept away from to ejector pad 7, the inboard of fluid channel 202 is equipped with spacing 9, spacing 9 includes annular slab 91, fixedly connected with a plurality of evenly distributed's branch 92 between annular slab 91 outer end and the fluid channel 202 inner wall, spacing stick 10 sliding connection is in the inside of annular slab 91, through the cooperation use of spacing 9 and spacing stick 10, can play the spacing effect to ejector pad 7, when the transformer terminal electric current resumes normal, electro-magnet 12 magnetic field weakens, under the magnetic force of main magnetic ring 5 and sub-magnetic ring 6, main joint 2 and sub-joint 3 connect again, thereby promote ejector pad 7 along the straight line of moving track back in the fluid channel 202.
According to the invention, on one hand, the station transformer metering data are applied to the distribution network automation system, the collected station transformer remote signaling and remote sensing signals are analyzed, the fault positioning and load transfer work is carried out by the distribution network dispatcher, the specific station transformer and the line position at the position are rapidly positioned, and on the other hand, the self-healing pre-interrupter is adopted to communicate the power transmission between the station transformer terminal and the power output terminal, so that when the station transformer terminal fails, the self-healing pre-interrupter automatically breaks the power transmission to the power output terminal, and when the station transformer terminal returns to normal, the power transmission is automatically restored, the line power safety is effectively protected, the work of the distribution network dispatcher is lightened, and the safety and timeliness of the line power use are ensured.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A distribution network circuit fault positioning protection method based on a transformer metering technology is characterized by comprising the following steps of: the method comprises the following steps:
s1: the power output by the station transformer terminal is transmitted to the power output terminal through the self-healing pre-breaker, and in the process, the remote signaling quantity and the remote sensing quantity of the station transformer terminal are collected in real time through the station transformer metering collection device;
s2: the station transformer metering acquisition device stores acquired data, screens out effective remote signaling and remote measuring signals and reports the signals to the distribution network automation system, the distribution network automation system combines station transformer information with single line drawing upper station variable data to infer fault information of the station transformer and the line, and the station transformer power point tracking system is used for positioning the specific station transformer and the line;
s3: the self-healing type pre-breaker receives the electric energy transmitted by the station transformer terminal, when the transmission voltage and the current are overlarge and exceed the allowable transmission maximum value of the self-healing type pre-breaker, the self-healing type pre-breaker automatically breaks, the electric energy transmission between the station transformer terminal and the electric power output terminal is interrupted, and when the voltage and the current received by the self-healing type pre-breaker recover to normal values, the self-healing type pre-breaker is reclosed, and the transmission of electric power is recovered;
the self-healing type pre-breaker comprises a main joint (2) and an auxiliary joint (3) which are matched with each other, the main joint (2) is connected with a transformer terminal through a main lead (1), the auxiliary joint (3) is connected with a power output terminal through an auxiliary lead (4), one ends, close to each other, of the main joint (2) and the auxiliary joint (3) are respectively fixedly connected with a main magnetic ring (5) and an auxiliary magnetic ring (6), one ends, close to each other, of the main magnetic ring (5) and the auxiliary magnetic ring (6) are heteropolar, an electromagnet (12) is fixedly connected inside the auxiliary joint (3), a pair of limiting belts (11) are fixedly connected between the main joint (2) and the auxiliary joint (3), and the limiting belts (11) are located on the inner sides of the main magnetic ring (5).
2. The distribution network circuit fault location protection method based on the bench transformer metering technology according to claim 1, wherein the method comprises the following steps: the station transformer metering acquisition device is connected with a station transformer metering database and a data reporting system, the data reporting system is connected with a distribution network automation system, the distribution network automation system is connected with a station transformer single line diagram data and a fault analysis system, the fault analysis system is connected with a station transformer point tracking system, and the station transformer metering acquisition device comprises a remote signaling acquisition system and a remote measuring system.
3. The distribution network circuit fault location protection method based on the bench transformer metering technology according to claim 2, wherein the method is characterized in that: the station transformer metering database is connected with a GIS system, the GIS system is connected with a distribution network OCS system, and the distribution network OCS system is connected with a station transformer load rate display system.
4. The distribution network circuit fault location protection method based on the bench transformer metering technology according to claim 2, wherein the method is characterized in that: the bench transformer metering database is also connected with a line loss calculation system.
5. The distribution network circuit fault location protection method based on the bench transformer metering technology according to claim 2, wherein the method is characterized in that: the data reporting system is also connected with a reporting verification feedback system, and the reporting verification feedback system is connected with the station transformer single line diagram data.
6. The distribution network circuit fault location protection method based on the bench transformer metering technology according to claim 1, wherein the method comprises the following steps: the distribution network automation system is also connected with a live topology system, and the live topology system is connected with a switch system.
7. The distribution network circuit fault location protection method based on the bench transformer metering technology as set forth in claim 6, wherein the method comprises the following steps: the inside of main joint (2) has seted up reservoir (201), fluid channel (202) have been seted up to the one end that reservoir (201) is close to sub-joint (3), the inboard of fluid channel (202) is equipped with ejector pad (7), fixedly connected with flexible bag (8) between the side of ejector pad (7) and fluid channel (202) inner wall, the inside of reservoir (201) and fluid channel (202) is all filled with the magnetic fluid, the magnetic fluid is located one side that sub-joint (3) was kept away from to ejector pad (7).
8. The distribution network circuit fault location protection method based on the bench transformer metering technology as set forth in claim 7, wherein the method comprises the following steps: one end fixedly connected with spacing stick (10) of sub-joint (3) is kept away from to ejector pad (7), the inboard of fluid channel (202) is equipped with spacing (9), spacing (9) are including annular plate (91), fixedly connected with a plurality of evenly distributed's branch (92) between annular plate (91) outer end and fluid channel (202) inner wall, spacing stick (10) sliding connection is in the inside of annular plate (91).
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