CN113933641A - Power distribution network clearance time-varying arc light grounding fault simulation test method - Google Patents
Power distribution network clearance time-varying arc light grounding fault simulation test method Download PDFInfo
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- CN113933641A CN113933641A CN202111561938.7A CN202111561938A CN113933641A CN 113933641 A CN113933641 A CN 113933641A CN 202111561938 A CN202111561938 A CN 202111561938A CN 113933641 A CN113933641 A CN 113933641A
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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
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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
Abstract
The invention belongs to the field of power system control, and particularly relates to a simulation test method for a clearance time-varying arc light grounding fault of a power distribution network. The method comprises the following steps that 1, a peeling function is started through a controller, and an arc gap is reset and cleared; step 2, the high-voltage and low-voltage electrodes are mutually far away to a sufficient insulation position by using a remote controller; step 3, starting a controller to collect a current signal and setting a current starting value; step 4, starting the circuit breaker to connect the time-varying gap arc discharge simulation device into a fault loop; step 5, starting the time-varying gap arc discharge simulation device to perform an arc test; and 6, disconnecting the breaker after several seconds, and ending the test. The invention can realize automatic clearance peeling, simulate the arc clearance change phenomenon in the fault process and record the critical clearance distance. The performance test of the single-phase earth fault positioning device for processing time-varying arc grounding is realized, and the arc gap change condition is simulated more quantitatively.
Description
Technical Field
The invention belongs to the field of power system control, and particularly relates to a simulation test method for a clearance time-varying arc light grounding fault of a power distribution network.
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, the system can be operated without power failure if the residual current is below 10A. In this case, if the arc is not extinguished, the discharge arc continues to exist at the fault point, which may cause further expansion of insulation damage and may also cause arc overvoltage. The overvoltage generated at this time has a long duration, penetrates through the whole network, and therefore, insulation breakdown occurs, so that short-circuit faults occur between phases, and further, the personal safety, the power supply of a user and related equipment are seriously affected.
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, since the medium recovery speed and the arc extinguishing capability of the cable, the GIS and the 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, therefore, the air arc self-extinguishing critical current in the single-phase grounding process needs to be tested, and a basis is provided for the configuration of the arc suppression coil of the 66kV system.
In conclusion, it is of great significance to design a fault simulation test method with dynamically adjustable arc gaps in the fault process.
Disclosure of Invention
The invention aims to provide a simulation test method for a gap time-varying arc grounding fault of a power distribution network, and aims to simulate the gap time-varying arc grounding fault phenomenon 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 a single-phase grounding fault positioning device and simulate the arc gap variation situation more quantitatively.
In order to achieve the purpose, the invention adopts the following technical scheme:
the simulation test method for the clearance time-varying arc grounding fault of the power distribution network comprises the following steps:
step 3, starting a controller to collect a current signal and setting a current starting value;
and 6, disconnecting the breaker after several seconds, and ending the test.
Further, the several seconds are 5 to 10 seconds.
Further, the starting time-varying gap arc discharge simulation device performs an arc test, and includes:
firstly, enabling two electrodes to approach each other at a set speed, detecting a current larger than a current starting value by a measuring device when discharge occurs between the electrodes, stopping a stepping motor for 1 second, and recording the electrode gap at the moment; the stepping motor rotates reversely to enable the high-voltage and low-voltage electrodes to be far away from each other at a set speed; when the detected current is lower than the starting value, stopping the stepping motor and delaying for 1 second, continuously detecting whether the current is still lower than the starting value within 1 second, if the detected current is greater than the starting value within 1 second, which means that the electric arc is reignited, continuing to rotate reversely by the stepping motor, so that the high-voltage and low-voltage electrodes are far away from each other at a set speed, and performing discharge detection again; and if the detected current is lower than the starting value within 1 second, recording the electrode gap at the moment, and continuously reversing the stepping motor to separate the electrodes to the maximum distance position.
Furthermore, the controller collects the current amplitude and the phase of the detected line, controls the rotating speed of the stepping motor through a pulse signal, enables the low-voltage electrode to be close to the high-voltage electrode, when the two electrodes are in contact, the loop is conducted, the ammeter detects the current, the controller controls the stepping motor to stop rotating, and the distance is defined as the electrode gap being 0.
Further, when the controller detects that the current flowing through the electrode increases from 0 to greater than the start value, the current electrode gap is recorded and remotely transmitted to a remote controller.
Further, when the controller detects that the current flowing through the electrode decreases from greater than the start value to less than the start value, the current electrode gap is recorded and remotely transmitted to a remote controller.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a simulation test method for a clearance time-varying arc light grounding fault of a power distribution network, which can simulate the clearance time-varying arc grounding fault phenomenon on an actual distribution line or a true type and a simulation platform so as to realize the performance test of processing time-varying arc grounding on a single-phase grounding fault positioning device;
further, the ignition distance and the arc blowout distance are recorded, and test data can be provided for the research on the arc blowout characteristic of the single-phase arc grounding fault of the power distribution network;
furthermore, the test method provided by the invention can simulate the change of the arc clearance more quantitatively, and a common arc clearance simulation device can not simulate the change condition of the clearance quantitatively and in the arc combustion process;
furthermore, the controller measures the current signal flowing through the electrode, and can automatically judge whether the electric arc is ignited or not.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a test platform of the apparatus of the present invention;
FIG. 2 is a schematic structural diagram of an arc simulator of the apparatus of the present invention;
FIG. 3 is a schematic diagram of the controller electrode gap peeling function of the apparatus of the present invention;
FIG. 4 is a flow chart of the controller electrode gap peeling function of the apparatus of the present invention;
fig. 5 is a flow chart of a simulation test method of a power distribution network clearance time-varying arc grounding fault of the device.
In the figure:
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The solution of some embodiments of the invention is described below with reference to fig. 1-5.
Example 1
The invention provides an embodiment, which is a simulation test method for a clearance time-varying arc grounding fault of a power distribution network, and is realized by utilizing a simulation test device for the clearance time-varying arc grounding fault of the power distribution network, wherein the device is shown in figure 1 and is a schematic structural diagram of a test platform of the device, and the simulation test device comprises: fuse 1, circuit breaker 2, time-varying gap arc discharge analogue means 3, current transformer 4 and controller 5. The invention also comprises a remote controller. The remote controller can remotely control the forward rotation and the reverse rotation of the stepping motor so as to control the electrodes to approach or depart from each other.
One end of the fuse 1 is connected with an isolating switch of a fault phase leading-out wire, the other end of the fuse 1 is connected with one end of the circuit breaker 2, the other end of the circuit breaker 2 is connected with a high-voltage electrode 33 of the time-varying gap arc discharge simulation device 3, and a low-voltage electrode 34 of the time-varying gap arc discharge simulation device 3 is grounded; and a current transformer 4 is sleeved on the grounding wire and used for measuring the current flowing through the time-varying gap arc discharge simulation device 3 and transmitting the measured current to a controller 5. The two ends of the controller 5 are respectively connected with the circuit breaker 2 and the time-varying gap arc discharge simulation device 3 through lines.
Fig. 2 is a schematic structural diagram of an arc simulator of the present invention. The time-varying gap arc discharge simulation device 3 comprises a high-voltage electrode 33, a low-voltage electrode 34, a stepping motor 39, a holder 37, a base 31 and an insulating support 32. Wherein, insulating support 32, step motor 39, screw bracket 35, cloud platform 37 fixed connection are on the vertically longer one end of base 31.
The insulating support 32 is composed of 2 insulating support columns, wherein one insulating support column is fixedly connected to the vertically longer end of the base 31, and the other insulating support column is connected to the holder 37. The high-voltage electrode 33 and the low-voltage electrode 34 are both brass material rods, one end of each brass material rod is sleeved with a ball electrode, and the other end of each brass material rod is fixed on each of the 2 insulating support columns. The ball electrode size includes 2 kinds, and the diameter is respectively phi 20mm and phi 50 mm. The holder 37 is fixed on the screw rod 36, the size of the holder is 80 multiplied by 68mm, the holder 37 is controlled to move through the screw rod with the diameter of 20mm, and the variable stroke length is 200 mm.
An output shaft of the stepping motor 39 is connected with a lead screw 36 through a connecting piece 38, the lead screw 36 is fixed on the base through a lead screw bracket 35, and the rotation of the lead screw is controlled so as to control the holder 37 to move linearly; a signal output of the controller 5 is connected to a signal input of the stepper motor 39.
The lead screw 36 is connected with the stepping motor 39 through a coupler, and the stepping motor 39 drags the lead screw 36 to rotate to drive the holder 37 to do linear motion, so that the low-voltage electrode 34 is driven to do linear motion, and the electrode gap is dynamically adjusted.
The controller 5 collects the current amplitude and phase of the tested line, and controls the rotating speed of the stepping motor 39 through a pulse signal, so that the arc gap is controlled, and dynamic gap adjustment is realized when an arc fault occurs.
Fig. 3 is a schematic diagram showing the peeling function of the controller electrode gap of the device of the present invention. A low-voltage direct current power supply 51 is added on the high-voltage electrode 33 and the low-voltage electrode 34, an ammeter 52 is connected in series in a loop, the controller 5 controls the stepping motor 39 to enable the low-voltage electrode 34 to be close to the high-voltage electrode 33 along the direction indicated by an arrow, when the two electrodes are contacted, the loop is conducted, the ammeter detects current, the controller 5 controls the stepping motor 39 to stop rotating, and the distance is defined as the electrode gap being 0.
Fig. 4 shows a flow chart of the peeling function of the electrode gap of the controller of the device of the present invention. The controller 5 has a peeling function, when the function is started, the high-voltage electrode 33 and the low-voltage electrode 34 are close to each other, when the high-voltage electrode and the low-voltage electrode are in contact, namely the electrode gap is 0, the controller stops, and the controller resets the current electrode gap to be 0 point.
When the controller detects that the current flowing through the electrode is increased from 0 to be larger than the starting value, the current electrode gap is recorded and is remotely transmitted to the remote controller, and when the controller 5 detects that the current flowing through the electrode is decreased from being larger than the starting value to be lower than the starting value, the current electrode gap is recorded and is remotely transmitted to the remote controller.
Example 2
The invention further provides an embodiment, which is a simulation test method for a clearance time-varying arc grounding fault of a power distribution network, and as shown in fig. 5, the invention is a flow chart of the simulation test method for the clearance time-varying arc grounding fault of the power distribution network.
The invention comprises the following steps:
step 3, starting a controller to collect a current signal and setting a current starting value;
and 5, starting the time-varying gap arc discharge simulation device to perform an arc test.
Firstly, enabling two electrodes to approach each other at a set speed, detecting a current larger than a current starting value by a measuring device when discharge occurs between the electrodes, stopping a stepping motor for 1 second, and recording the electrode gap at the moment; the stepping motor rotates reversely to enable the high-voltage and low-voltage electrodes to be far away from each other at a set speed; when the detected current is lower than the starting value, stopping the stepping motor and delaying for 1 second, continuously detecting whether the current is still lower than the starting value within 1 second, if the detected current is greater than the starting value within 1 second, which means that the electric arc is reignited, continuing to rotate reversely by the stepping motor, so that the high-voltage and low-voltage electrodes are far away from each other at a set speed, and performing discharge detection again; and if the detected current is lower than the starting value within 1 second, recording the electrode gap at the moment, and continuously reversing the stepping motor to separate the electrodes to the maximum distance position.
And 6, disconnecting the breaker after 5-10 seconds, and ending the test.
In the present invention, the terms "connected" and "fixed" should be interpreted broadly, for example, the term "connected" may be a fixed connection, a detachable connection, or an integral connection. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the indicated devices or units must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (6)
1. The simulation test method for the power distribution network clearance time-varying arc light grounding fault is characterized by comprising the following steps: the method comprises the following steps:
step 1, starting a peeling function through a controller to reset an arc gap;
step 2, the high-voltage and low-voltage electrodes are mutually far away to a sufficient insulation position by using a remote controller;
step 3, starting a controller to collect a current signal and setting a current starting value;
step 4, starting the circuit breaker to connect the time-varying gap arc discharge simulation device into a fault loop;
step 5, starting the time-varying gap arc discharge simulation device to perform an arc test;
and 6, disconnecting the breaker after several seconds, and ending the test.
2. The method for simulation test of clearance time varying arc grounding fault of power distribution network as claimed in claim 1, wherein: the seconds are 5-10 seconds.
3. The method for simulation test of clearance time varying arc grounding fault of power distribution network as claimed in claim 1, wherein: the starting time-varying gap arc discharge simulation device performs an arc test, and comprises:
firstly, enabling two electrodes to approach each other at a set speed, detecting a current larger than a current starting value by a measuring device when discharge occurs between the electrodes, stopping a stepping motor for 1 second, and recording the electrode gap at the moment; the stepping motor rotates reversely to enable the high-voltage and low-voltage electrodes to be far away from each other at a set speed; when the detected current is lower than the starting value, stopping the stepping motor and delaying for 1 second, continuously detecting whether the current is still lower than the starting value within 1 second, if the detected current is greater than the starting value within 1 second, which means that the electric arc is reignited, continuing to rotate reversely by the stepping motor, so that the high-voltage and low-voltage electrodes are far away from each other at a set speed, and performing discharge detection again; and if the detected current is lower than the starting value within 1 second, recording the electrode gap at the moment, and continuously reversing the stepping motor to separate the electrodes to the maximum distance position.
4. The method for simulation test of clearance time varying arc grounding fault of power distribution network as claimed in claim 1, wherein: the controller collects the current amplitude and the phase of a measured line, controls the rotating speed of the stepping motor through a pulse signal, enables the low-voltage electrode to be close to the high-voltage electrode, when the two electrodes are in contact, the loop is conducted, the ammeter detects the current, the controller controls the stepping motor to stop rotating, and the distance is defined as the electrode gap being 0.
5. The method for simulation test of clearance time varying arc grounding fault of power distribution network as claimed in claim 1, wherein: when the controller detects that the current flowing through the electrode increases from 0 to a value greater than the starting value, the current electrode gap is recorded and remotely transmitted to a remote controller.
6. The method for simulation test of clearance time varying arc grounding fault of power distribution network as claimed in claim 1, wherein: when the controller detects that the current flowing through the electrode decreases from greater than the starting value to less than the starting value, the current electrode gap is recorded and remotely transmitted to a remote controller.
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Application publication date: 20220114 |