CN114019308A - Power distribution network single-phase earth fault arc self-extinguishing characteristic simulation device and test method - Google Patents
Power distribution network single-phase earth fault arc self-extinguishing characteristic simulation device and test method Download PDFInfo
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- CN114019308A CN114019308A CN202111303174.1A CN202111303174A CN114019308A CN 114019308 A CN114019308 A CN 114019308A CN 202111303174 A CN202111303174 A CN 202111303174A CN 114019308 A CN114019308 A CN 114019308A
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- 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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Abstract
A power distribution network single-phase earth fault arc self-extinguishing characteristic simulation device and a test method. The simulation device comprises a fuse, a circuit breaker, an arc striking device, a Rogowski coil, a resistance-capacitance voltage divider and a controller, wherein the arc striking device comprises a high-voltage electrode and a grounding electrode; the Rogowski coil measures the current flowing through the arc striking device; the two ends of the arc striking device are connected with a resistance-capacitance voltage divider in parallel, and the resistance-capacitance voltage divider measures the voltage of the arc striking device; the controller records the electrode gap distance between the high-voltage electrode and the low-voltage electrode and controls the high-voltage electrode to move horizontally so as to adjust the electrode gap between the high-voltage electrode and the grounding electrode; the controller judges the arc ignition or extinction by comparing the set current signal value with the real-time current signal value measured by the Rogowski coil, and records the electrode gap distance between the arc ignition time and the arc extinction time. The invention can record the ignition distance and the arc extinguishing distance, quantitatively simulate the arc gap change and automatically judge whether the arc is ignited or extinguished.
Description
Technical Field
The invention belongs to the field of power system control, and particularly relates to a power distribution network single-phase earth fault arc self-extinguishing characteristic simulation device and a test method.
Background
The power distribution network is a key link directly facing to the majority of users, the safety, the stability and the quick recovery after the fault are paid more and more attention, and the power distribution network has extremely important practical significance for the safe and stable development of urban economy. In a power distribution network, the probability of a single-phase earth fault occurring accounts for 80% of the total faults. When the system is operated and has a single-phase earth fault, one phase-to-earth voltage with the fault is lowered, and the other two phase-to-earth voltages and the zero-sequence voltage at the neutral point are raised, so that the three phase-to-earth voltages in the system can not be unbalanced. However, the line voltage can continue to keep the original symmetrical operation in a short time, and the power supply of a user is not greatly influenced. According to the national regulations, under the fault, if the residual current of the system is below 10A, the system can operate for 1-2 h without power failure. In this case, if the arc is not extinguished, that is, if a discharge arc continues to exist at the fault point, the insulation damage may be further increased, and an arc overvoltage may be caused. The overvoltage generated by the method has longer duration, runs through the whole network, and generates insulation breakdown, so that short circuit fault occurs between phases, and further serious influence is caused on personal safety, power supply of users and related equipment.
The 66kV system in the northeast region is higher in system voltage, and the overall capacitance current level is theoretically higher than that of the 35kV system in other regions. The theory that the residual current is controlled below 10A, namely the single-phase earth fault arc can be automatically extinguished is widely adopted at present and is also obtained under the air condition based on 10kV and 35kV systems, and for 66kV systems with higher voltage level and faster voltage recovery, the applicability of the value needs further intensive research, and due to the high-speed development of the current urban construction, the proportion of the traditional power transmission and transformation modes of an overhead line and an open-type transformer substation in a 66kV system is gradually reduced, the power transmission and transformation mode of a cable matched with a GIS is gradually the mainstream, because the medium recovery speed and the arc extinguishing capability of a cable, a GIS and air insulation are different, the standard of the traditional single-phase earth fault arc self-extinguishing critical residual current 10A is not applicable any more, and the air arc self-extinguishing critical current in single-phase earth is necessarily tested, so that a basis is provided for the configuration of an arc extinguishing coil of a 66kV system.
Prior art document 1(CN 112964964A, application publication No. 2021.06.15): an open distribution network ground fault arc simulation device and an arc handling equipment verification method are disclosed. The simulation apparatus includes: a first electrode, a second electrode and a gap adjusting device; the first electrode is arranged opposite to the second electrode; the second electrode is connected with the gap adjusting device; when the gap adjusting device controls the second electrode to be far away from or close to the first electrode, the gap formed by the first electrode and the second electrode is increased or decreased; insulating gas is filled in a gap formed by the first electrode and the second electrode; when the potential difference between the first electrode and the second electrode is not less than a predetermined value and the gap adjusting device controls the second electrode to be close to the first electrode and the distance between the first electrode and the second electrode is not more than the predetermined value, the insulating gas in the gap generates arc discharge. The prior art document 1 has disadvantages that the arc quenching characteristics of the ground arc cannot be quantitatively measured, the ignition distance and the arc quenching distance of the arc cannot be analyzed and recorded, and the gap variation in the arc combustion process cannot be quantitatively simulated.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a power distribution network single-phase earth fault arc self-extinguishing characteristic simulation device and a test method.
The invention adopts the following technical scheme.
The electric arc self-extinguishing characteristic simulation device for the single-phase earth fault of the power distribution network comprises a fuse, a circuit breaker, an arc striking device, a Rogowski coil, a resistance-capacitance voltage divider and a controller,
the arc striking device comprises a high-voltage electrode and a grounding electrode;
one end of the circuit breaker is connected with the fuse, the other end of the circuit breaker is connected with a high-voltage electrode of the arc striking device, and a grounding electrode of the arc striking device is grounded through an insulated grounding wire; the insulating grounding lead is sleeved with a Rogowski coil, and the Rogowski coil is used for measuring the current flowing through the arc striking device and transmitting the measured current to the controller; the two ends of the arc striking device are connected with a resistance-capacitance voltage divider in parallel, and the resistance-capacitance voltage divider is used for measuring the voltage of the arc striking device and transmitting the measured voltage to the controller; two ends of the controller are respectively connected with the arc striking device and the circuit breaker;
the controller records the electrode gap distance between the high-voltage electrode and the low-voltage electrode and controls the grounding electrode to move horizontally so as to adjust the electrode gap between the high-voltage electrode and the grounding electrode;
the controller judges the arc ignition or extinction by comparing the set current signal value with the real-time current signal value measured by the Rogowski coil, and records the electrode gap distance between the arc ignition time and the arc extinction time.
The arc striking device comprises a high-voltage electrode, a grounding electrode, a stepping motor, a lead screw, a sealing tank, a remote controller and an insulating support.
The high-voltage electrode comprises a high-voltage electrode conducting rod and a replaceable high-voltage electrode end, and the high-voltage electrode end is connected with the high-voltage electrode conducting rod through an electrode threaded connector;
the grounding electrode comprises a grounding electrode conductive rod and a replaceable grounding electrode end, and the end head of the grounding electrode is connected with the grounding electrode conductive rod through an electrode threaded connector.
Preferably, the high voltage electrode and the ground electrode are brass.
The insulating support includes: the base, limit platform, insulating support post are fixed on the base, and the base is installed the limit platform on one side, and limit bench installation step motor, lead screw, insulating connecting piece connect gradually, and earthing electrode conducting rod is connected to insulating connecting piece, and the rotation of step motor is controlled to the controller, makes earthing electrode conducting rod do horizontal migration.
The sealing tank is a cylindrical tank body, the grounding electrode conducting rod is fixed on the side surface of the tank body by utilizing dynamic sealing, and the part of the grounding electrode conducting rod extending out of the sealing tank is grounded;
the high-voltage electrode conducting rod is fixed on the other side of the tank body, and the part of the high-voltage electrode conducting rod extending out of the sealed tank body is connected with the positive electrode of the power supply;
the high-voltage electrode conducting rod and the grounding electrode conducting rod are arranged in a horizontal opposite mode in the sealed tank.
The two ends of the lower part of the tank body of the sealed tank are connected with a first air pipe and a second air pipe, the first air pipe is used for filling test gas into the sealed tank, and the second air pipe is used for releasing the test gas in the sealed tank;
the test gas comprises sulfur hexafluoride SF6, vacuum and dry air, and is used for simulating the intermittent fault arc phenomenon in different media.
A pressure gauge is connected above the tank body of the sealed tank and used for monitoring the pressure in the tank body;
a pressure relief valve is connected above the tank body of the sealed tank;
an operation window is arranged on the side surface of the sealed tank body and used for replacing the electrode and connecting the fuse.
The controller records the electrode gap distance between the high-voltage electrode and the low-voltage electrode and remotely sends the electrode gap distance to the remote controller, the remote controller sends a set electrode movement speed signal and a set electrode movement direction signal to the controller, the controller converts the set electrode movement speed signal and the set electrode movement direction signal into pulse signals and sends the pulse signals to the stepping motor, the stepping motor is connected with the grounding electrode through a lead screw, and the controller controls the stepping motor to rotate, so that the grounding electrode horizontally moves, and the electrode gap distance is changed.
The controller has a recording function, the controller judges whether the electric arc is ignited or extinguished by comparing a set current signal value with a current signal value measured by the Rogowski coil and flowing through the electrode, sets an ignition current value, judges the ignition of the electric arc when the real-time measured current value received by the controller is greater than the set ignition current value, records the electrode distance between the high-voltage electrode and the grounding electrode at the current moment, and defines the electrode distance as the ignition distance; and the real-time measured current value received by the controller is smaller than the ignition current value, the arc extinction is judged, the electrode distance between the high-voltage electrode and the grounding electrode at the current moment is recorded, and the arc extinction distance is defined.
The method for testing the arc self-extinguishing characteristic of the single-phase earth fault of the power distribution network comprises the following steps:
step 4, starting the circuit breaker to connect the arc striking device into a fault loop, and injecting test gas with set pressure into the sealing tank;
step 7, judging whether the real-time current value in 1s is larger than the starting value, if so, judging the electric arc reignition and executing step 6; if not, executing step 8;
and 8, controlling the stepping motor to continuously rotate reversely, so that the high-voltage electrode and the grounding electrode are mutually far away to the maximum position of the electrode gap.
And 9, disconnecting the breaker after the time is set, and ending the test.
When the peeling function is started, a low-voltage direct-current power supply is added to a high-voltage electrode and a ground electrode, the ground electrode is controlled to be close to the high-voltage electrode, when current is generated in a loop, a controller controls a stepping motor to stop rotating, and the distance between the end head of the high-voltage electrode and the end head of the ground electrode at the moment is defined as electrode gap resetting and zero clearing.
The controller automatically judges the arc ignition and the arc extinction according to the set current starting value, and when the real-time current value is larger than the current starting value, the arc ignition is judged and the electrode gap at the moment is recorded; and when the real-time current value is smaller than the current starting value, judging that the electric arc is extinguished and recording the electrode gap at the moment.
Compared with the prior art, the single-phase earth fault arc self-extinguishing characteristic simulation device and the test method for the power distribution network provided by the invention can simulate the gap fault arc phenomenon in different media on an actual distribution line or a true type and simulation platform so as to realize the performance test of processing time-varying arc grounding on the single-phase earth fault positioning device.
The beneficial effects of the invention also include:
1. recording the ignition distance and the arc blowout distance, and providing test data for the research on the arc blowout characteristic of the single-phase arc grounding fault of the power distribution network;
2. the test method provided by the invention can simulate the change of the arc clearance more quantitatively and can simulate the change condition of the clearance in the arc combustion process;
3. the controller measures the current signal flowing through the electrode, and can automatically judge whether the electric arc is ignited or not;
4. the dynamic arc discharge process in different gas media can be simulated.
Drawings
FIG. 1 is a schematic view of an apparatus of the present invention accessing a test platform;
FIG. 2 is a schematic structural view of an arc striking device of the present invention;
FIG. 3 is a schematic view of a seal pot of the arc striking device of the present invention;
FIG. 4 is a schematic diagram of the controller electrode gap peeling function of the apparatus of the present invention;
FIG. 5 is a flow chart of the controller electrode gap peeling function of the apparatus of the present invention;
fig. 6 is a flowchart of a simulation test method for arc self-extinguishing characteristics of a single-phase earth fault of a power distribution network according to an embodiment of the present invention;
FIG. 7 shows an SF example of an embodiment of the present invention6The flow chart of the arc self-extinguishing characteristic test method in (1).
The reference signs are:
1. a fuse; 2. a circuit breaker; 3. an arc striking device; 4. a Rogowski coil;
5. a resistive-capacitive voltage divider; 6. a controller;
21. a high voltage electrode conductive rod; 22. the high-voltage electrode end can be replaced; 23. grounding the electrode conductive rod;
24. a replaceable ground electrode tip; 25. insulating support columns; 26. a base; 27. a side table;
28. a lead screw; 29. An insulating connector;
210. sealing the tank; 212. A remote controller;
30. sealing the tank body; 31. dynamic sealing; 32. a first air pipe; 33. a second air pipe;
34. a pressure gauge; 35. a pressure relief valve; 36. the electrode is connected with a threaded connector; 37. an operating window;
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Example 1: an electric distribution network single-phase earth fault arc self-extinguishing characteristic simulation device is shown in figures 1 and 2, and comprises: the circuit breaker comprises a fuse 1, a circuit breaker 2, an arc striking device 3, a Rogowski coil 4, a resistance-capacitance voltage divider 5 and a controller 6.
One end of the fuse 1 is connected with an isolating switch of a fault phase leading-out wire through a hardware fitting and a cable, the other end of the fuse is connected with a circuit breaker 2, the other end of the circuit breaker 2 is connected with a high-voltage electrode of an arc striking device 3, and a grounding electrode of the arc striking device is grounded through an insulated grounding wire; the insulating grounding lead is sleeved with a Rogowski coil 4, the Rogowski coil 4 is used for measuring the current flowing through the arc ignition device and transmitting the measured current to the controller 6; the two ends of the arc striking device 3 are connected with a resistance-capacitance voltage divider 5 in parallel, and the resistance-capacitance voltage divider 5 is used for measuring the voltage of the arc striking device and transmitting the measured voltage to the controller 6; the controller 6 is connected to the arc striking device 3 and the circuit breaker 2, respectively. The controller records the electrode gap distance between the high-voltage electrode and the low-voltage electrode and controls the grounding electrode to move horizontally so as to adjust the electrode gap between the high-voltage electrode and the grounding electrode; the controller judges the arc ignition or extinction by comparing the set current signal value with the real-time current signal value measured by the Rogowski coil, and records the electrode gap distance between the arc ignition time and the arc extinction time.
The arc striking device comprises a high-voltage electrode, a grounding electrode, a stepping motor, a lead screw 28, a sealing tank 210, a remote controller 212 and an insulating bracket; wherein insulating support includes: base 26, side table 27, insulating support column 25; the high voltage electrode includes: a high-voltage electrode conducting rod 21 and a replaceable high-voltage electrode end 22; the ground electrode includes: a ground electrode conductive rod 23, a replaceable ground electrode tip 24; the high-voltage electrode and the grounding electrode are both made of brass materials, wherein the end head 22 of the high-voltage electrode is connected with the high-voltage electrode conducting rod 21 through an electrode threaded connector 36; the ground electrode tip 24 is connected to the ground electrode contact rod 23 through the electrode screw connection port 36, and the high-voltage electrode contact rod 21 and the ground electrode contact rod 23 are partially fixed in the sealed can 210 and are arranged in a horizontally opposed manner in the sealed can 210.
As shown in fig. 3, the sealing can 210 is a cylindrical can with a diameter of 500mm, the high-voltage electrode conducting rod 21 is fixed on the side surface of the sealing can 30 by using a dynamic seal 31, and the part of the high-voltage electrode conducting rod extending out of the sealing can 210 is connected with a positive power supply, which is a power distribution network power supply or a test power supply, specifically, a certain one of three-phase lines in the embodiment; the grounding electrode conductive rod 23 is fixed on the other side of the tank body, the part of the grounding electrode conductive rod extending out of the tank body of the sealed tank is grounded, two ends of the lower part of the tank body are connected with a first air pipe 32 and a second air pipe 33, the first air pipe 32 is used for filling test gas into the sealed tank, and the second air pipe 33 is used for releasing the test gas in the sealed tank; the technicians in the field can charge and discharge different gases in the sealing tank according to experimental requirements, wherein the gases include but are not limited to sulfur hexafluoride SF6, vacuum and dry air, and the gases are used for simulating the intermittent fault arc phenomenon in different media and realizing the performance test of the single-phase earth fault positioning device for processing time-varying arc grounding. A pressure gauge 34 is connected above the tank body, and the pressure gauge 34 is used for monitoring the pressure in the tank body; a pressure release valve 35 is connected above the tank body, and an electrode threaded connecting port 36 is arranged on the inner side of the electrode conducting rod tube and used for replacing and connecting electrodes. The side of the can body is provided with an operation window 37 for replacing the can body electrode and connecting the fuse before and after the test.
The insulating support column 25 is fixed on the base 26, the side table 27 is installed on one side of the base, the stepping motor 210 is installed on the side table 27, the stepping motor, the lead screw 28 and the insulating connecting piece 29 are sequentially connected, the insulating connecting piece 29 is connected with the grounding electrode conductive rod, and the controller controls the stepping motor to rotate so that the grounding electrode conductive rod moves horizontally.
The controller 6 is connected to the sealed tank body 30, in order to avoid danger which may occur when a worker directly operates the controller in the discharge test process, a remote controller 212 is arranged, the remote controller 212 can remotely control the controller, the remote controller 212 is responsible for setting parameters and then remotely sends the parameters to the controller, and the controller converts the control parameters into pulse signals to control the movement of the stepping motor.
The controller 6 has a remote control function, can record the current electrode gap distance in real time and remotely sends the current electrode gap distance to the remote controller, and the remote controller receives the current electrode gap distance and controls the high-voltage electrode and the grounding electrode to be close to or far away from each other by controlling the forward rotation and the reverse rotation of the stepping motor so as to change the set distance; the remote controller controls the stepping motor to rotate forwards or backwards, the stepping motor controls the high-voltage electrode to move horizontally through the lead screw, and the maximum distance between the high-voltage electrode and the grounding electrode reaches 800 mm.
The controller has a recording function, the controller judges whether the electric arc is ignited or extinguished by comparing a set current signal value with a current signal value measured by the Rogowski coil and flowing through the electrode, specifically, the ignition current value is set, when the real-time measured current value received by the controller is greater than the set ignition current value, the ignition of the electric arc is judged, the electrode distance between the high-voltage electrode and the grounding electrode at the current moment is recorded, and the electrode distance is defined as the ignition distance; the real-time measurement current value received by the controller is smaller than the ignition current value, the arc extinction is judged, the electrode distance between the high-voltage electrode and the grounding electrode at the current moment is recorded, and the arc extinction distance and the ignition distance can be defined as the arc extinction distance, so that test data can be provided for researching the single-phase arc grounding fault arc extinction characteristic of the power distribution network.
The controller records the electrode gap distance between the high-voltage electrode and the low-voltage electrode and remotely sends the electrode gap distance to the remote controller, the remote controller sends a set electrode movement speed signal and a set electrode movement direction signal to the controller, the controller converts the set electrode movement speed signal and the set electrode movement direction signal into pulse signals and sends the pulse signals to the stepping motor, the stepping motor is connected with the grounding electrode through a lead screw, and the controller controls the stepping motor to rotate, so that the grounding electrode horizontally moves, and the electrode gap distance is changed.
The controller controls the rotating speed of the stepping motor through the pulse signals, so that the arc gap is controlled, and the movement speed adjustment of the electrode gap in the test is realized.
The controller has an electrode gap peeling function, when the function is started, the high-voltage electrode and the grounding electrode are close to each other, when the current is applied, namely the electrode gap is 0, the controller stops, and the controller resets the current electrode gap to be 0 point. As shown in fig. 4, the electrode gap peeling function of the controller of the present invention is schematically illustrated. A low-voltage direct-current power supply 41 is added on the high-voltage electrode and the grounding electrode, an ammeter 42 is connected in series in a loop, the controller controls the stepping motor to enable the grounding electrode 24 to be close to the high-voltage electrode 22 along the direction indicated by an arrow, when the loop is conducted and the ammeter detects current, the controller controls the stepping motor to stop rotating, and the distance between the tip of the high-voltage electrode and the tip of the grounding electrode at the moment is defined as the electrode gap being 0. The gap peeling procedure is shown in fig. 5.
The power distribution network single-phase earth fault arc self-extinguishing characteristic test method based on the power distribution network single-phase earth fault arc self-extinguishing characteristic simulation device comprises the following steps:
step 4, starting the circuit breaker to connect the arc striking device into a fault loop, and injecting test gas with set pressure into the sealing tank;
step 7, judging whether the real-time current value in 1s is larger than the starting value, if so, judging the electric arc reignition and executing step 6; if not, executing step 8;
and 8, controlling the stepping motor to continuously rotate reversely, so that the high-voltage electrode and the grounding electrode are mutually far away to the maximum position of the electrode gap.
And 9, disconnecting the breaker after the time is set, and ending the test.
Example 2: a simulation test method for the arc self-extinguishing characteristic of the single-phase earth fault of a power distribution network is disclosed, as shown in figure 6,
specifically, the controller controls the stepping motor to enable the grounding electrode to approach the high-voltage electrode until current is detected in the loop, the stepping motor is controlled to stop rotating, and the distance between the high-voltage electrode and the grounding electrode at the moment is defined as the electrode gap being 0;
step 4, starting the circuit breaker to connect the arc striking device into a fault loop; closing the operation window on the side surface of the tank body, and filling test gas into the sealing tank through a first gas pipe to enable the pressure in the pipe to reach a pressure value for a test;
step 7, judging whether the real-time current value detected by the ammeter in 1s is larger than the current starting value, if so, judging that the arc is reignited and executing step 6; if not, recording the electrode gap value between the high-voltage electrode and the grounding electrode at the moment and defining the electrode gap value as an arc quenching distance, and executing the step 8;
and 8, controlling the stepping motor to continuously rotate reversely, so that the high-voltage electrode and the grounding electrode are mutually far away to the maximum position of the electrode gap.
And 9, opening the breaker after the set time, and ending the test, wherein the set time is preferably 10 seconds.
Example 3: an arc self-extinguishing characteristic test method with SF6 as experimental gas uses the simulation device for the arc self-extinguishing characteristic of the single-phase earth fault of the power distribution network, as shown in figure 7,
step 4, closing the door of the sealed tank, and filling the experimental gas with a set pressure into the sealed tank, wherein a person skilled in the art can select the gas with a proper pressure value according to experimental requirements, and in the embodiment, the SF6 gas with a pressure of 1Mpa is adopted;
and 7, controlling the stepping motor to rotate by the controller, enabling the high-voltage electrode and the grounding electrode to be mutually separated to increase the electrode gap until the electric arc between the electrodes is converted from being not extinguished into being not stably combusted, controlling the stepping motor to stop rotating, and recording the electrode gap value at the moment as an arc extinguishing distance critical value under the working condition.
And 8, controlling the stepping motor to continuously rotate to enable the high-voltage electrode and the grounding electrode to be sufficiently far away.
And 9, opening the breaker after the set time, and ending the test, wherein the set time is preferably 10 seconds.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (13)
1. The electric arc self-extinguishing characteristic simulation device for the single-phase earth fault of the power distribution network is characterized by comprising a fuse, a circuit breaker, an arc striking device, a Rogowski coil, a resistance-capacitance voltage divider and a controller,
the arc striking device comprises a high-voltage electrode and a grounding electrode;
one end of the circuit breaker is connected with the fuse, the other end of the circuit breaker is connected with a high-voltage electrode of the arc striking device, and a grounding electrode of the arc striking device is grounded through an insulated grounding wire; the insulating grounding lead is sleeved with a Rogowski coil, and the Rogowski coil is used for measuring the current flowing through the arc striking device and transmitting the measured current to the controller; the two ends of the arc striking device are connected with a resistance-capacitance voltage divider in parallel, and the resistance-capacitance voltage divider is used for measuring the voltage of the arc striking device and transmitting the measured voltage to the controller; two ends of the controller are respectively connected with the arc striking device and the circuit breaker;
the controller records the electrode gap distance between the high-voltage electrode and the low-voltage electrode and controls the grounding electrode to move horizontally so as to adjust the electrode gap between the high-voltage electrode and the grounding electrode;
the controller judges the arc ignition or extinction by comparing the set current signal value with the real-time current signal value measured by the Rogowski coil, and records the electrode gap distance between the arc ignition time and the arc extinction time.
2. The simulation device for the self-extinguishing characteristic of the single-phase earth fault arc of the power distribution network according to claim 1,
the arc striking device comprises a high-voltage electrode, a grounding electrode, a stepping motor, a lead screw, a sealing tank, a remote controller and an insulating support.
3. The simulation device for the self-extinguishing characteristic of the single-phase earth fault arc of the power distribution network according to claim 1,
the high-voltage electrode comprises a high-voltage electrode conducting rod and a replaceable high-voltage electrode end, and the high-voltage electrode end is connected with the high-voltage electrode conducting rod through an electrode threaded connector;
the grounding electrode comprises a grounding electrode conductive rod and a replaceable grounding electrode end, and the end head of the grounding electrode is connected with the grounding electrode conductive rod through an electrode threaded connector.
4. The simulation device for the self-extinguishing characteristic of the single-phase earth fault arc of the power distribution network according to claim 1,
the high-voltage electrode and the grounding electrode are made of brass.
5. The simulation device for the self-extinguishing characteristic of the single-phase earth fault arc of the power distribution network according to claim 1,
the insulating support includes: the base, limit platform, insulating support post are fixed on the base, and the base is installed the limit platform on one side, and limit bench installation step motor, lead screw, insulating connecting piece connect gradually, and earthing electrode conducting rod is connected to insulating connecting piece, and the rotation of step motor is controlled to the controller, makes earthing electrode conducting rod do horizontal migration.
6. The simulation device for the self-extinguishing characteristic of the single-phase earth fault arc of the power distribution network according to claim 1,
the sealing tank is a cylindrical tank body, the grounding electrode conducting rod is fixed on the side surface of the tank body by utilizing dynamic sealing, and the part of the grounding electrode conducting rod extending out of the sealing tank is grounded;
the high-voltage electrode conducting rod is fixed on the other side of the tank body, and the part of the high-voltage electrode conducting rod extending out of the sealed tank body is connected with the positive electrode of the power supply;
the high-voltage electrode conducting rod and the grounding electrode conducting rod are arranged in a horizontal opposite mode in the sealed tank.
7. The simulation apparatus for single-phase earth fault arc self-extinguishing characteristics of the power distribution network according to claim 6,
the two ends of the lower part of the tank body of the sealed tank are connected with a first air pipe and a second air pipe, the first air pipe is used for filling test gas into the sealed tank, and the second air pipe is used for releasing the test gas in the sealed tank;
the test gas comprises sulfur hexafluoride SF6, vacuum and dry air, and is used for simulating the intermittent fault arc phenomenon in different media.
8. The simulation apparatus for single-phase earth fault arc self-extinguishing characteristics of the power distribution network according to claim 7,
a pressure gauge is connected above the tank body of the sealed tank and used for monitoring the pressure in the tank body;
a pressure relief valve is connected above the tank body of the sealed tank;
an operation window is arranged on the side surface of the sealed tank body and used for replacing the electrode and connecting the fuse.
9. The simulation device for the self-extinguishing characteristic of the single-phase earth fault arc of the power distribution network according to claim 1,
the controller records the electrode gap distance between the high-voltage electrode and the low-voltage electrode and remotely sends the electrode gap distance to the remote controller, the remote controller sends a set electrode movement speed signal and a set electrode movement direction signal to the controller, the controller converts the set electrode movement speed signal and the set electrode movement direction signal into pulse signals and sends the pulse signals to the stepping motor, the stepping motor is connected with the grounding electrode through a lead screw, and the controller controls the stepping motor to rotate, so that the grounding electrode horizontally moves, and the electrode gap distance is changed.
10. The simulation device for the self-extinguishing characteristic of the single-phase earth fault arc of the power distribution network according to claim 1,
the controller has a recording function, the controller judges whether the electric arc is ignited or extinguished by comparing a set current signal value with a current signal value measured by the Rogowski coil and flowing through the electrode, sets an ignition current value, judges the ignition of the electric arc when the real-time measured current value received by the controller is greater than the set ignition current value, records the electrode distance between the high-voltage electrode and the grounding electrode at the current moment, and defines the electrode distance as the ignition distance; and the real-time measured current value received by the controller is smaller than the ignition current value, the arc extinction is judged, the electrode distance between the high-voltage electrode and the grounding electrode at the current moment is recorded, and the arc extinction distance is defined.
11. The power distribution network single-phase earth fault arc self-extinguishing characteristic test method based on the power distribution network single-phase earth fault arc self-extinguishing characteristic simulation device of any one of claims 1 to 10, is characterized by comprising the following steps of:
step 1, starting an electrode gap peeling function by a controller to reset the electrode gap;
step 2, controlling the electrode gap between the high-voltage electrode and the grounding electrode as a test value;
step 3, setting a current starting value by the controller;
step 4, starting the circuit breaker to connect the arc striking device into a fault loop, and injecting test gas with set pressure into the sealing tank;
step 5, starting an arc striking device, enabling the two electrodes to approach each other at a set speed, judging that arc discharge is generated at the moment when the real-time current value is larger than a current starting value, and controlling the stepping motor to stop rotating;
step 6, controlling the stepping motor to rotate, so that the electrode gap between the high-voltage electrode and the grounding electrode is enlarged, and when the real-time current value is smaller than the starting value, controlling the stepping motor to stop rotating to delay for 1 s;
step 7, judging whether the real-time current value in 1s is larger than the starting value, if so, judging the electric arc reignition and executing step 6; if not, executing step 8;
and 8, controlling the stepping motor to continuously rotate reversely, so that the high-voltage electrode and the grounding electrode are mutually far away to the maximum position of the electrode gap.
And 9, disconnecting the breaker after the time is set, and ending the test.
12. The method for testing the single-phase earth fault arc self-extinguishing characteristic of the power distribution network according to claim 11,
the controller has an electrode gap peeling function, when the peeling function is started, a low-voltage direct-current power supply is injected on the high-voltage electrode and the grounding electrode, the grounding electrode is controlled to be close to the high-voltage electrode, when current is generated in a loop, the controller controls the stepping motor to stop rotating, and the distance between the end head of the high-voltage electrode and the end head of the grounding electrode at the moment is defined as electrode gap resetting and zero clearing.
13. The method for testing the single-phase earth fault arc self-extinguishing characteristic of the power distribution network according to claim 11, wherein:
the controller automatically judges the arc ignition and the arc extinction according to the set current starting value, and when the real-time current value is larger than the current starting value, the arc ignition is judged and the electrode gap at the moment is recorded; and when the real-time current value is smaller than the current starting value, judging that the electric arc is extinguished and recording the electrode gap at the moment.
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| CN202111303174.1A CN114019308A (en) | 2021-11-05 | 2021-11-05 | Power distribution network single-phase earth fault arc self-extinguishing characteristic simulation device and test method |
| PCT/CN2022/110121 WO2023077887A1 (en) | 2021-11-05 | 2022-08-04 | Power distribution network single-phase grounding fault arc self-extinguishing characteristic simulation apparatus and test method |
| JP2022567397A JP2023552013A (en) | 2021-11-05 | 2022-08-04 | Simulation device and test method for self-extinguishing characteristics of single-phase ground fault arc in power distribution network |
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