CN109444687B - 10kV distribution network insulated conductor lightning stroke broken string simulation test platform - Google Patents
10kV distribution network insulated conductor lightning stroke broken string simulation test platform Download PDFInfo
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- CN109444687B CN109444687B CN201811359179.4A CN201811359179A CN109444687B CN 109444687 B CN109444687 B CN 109444687B CN 201811359179 A CN201811359179 A CN 201811359179A CN 109444687 B CN109444687 B CN 109444687B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The application discloses 10kV distribution network insulated conductor thunderbolt broken string analogue test platform, this test platform includes: the device comprises an impulse voltage unit, a simulation tower line unit, a power frequency current source unit and a data acquisition unit; the impulse voltage unit is connected to the insulating support column on the tower on one side through an insulating lead, and the impulse voltage unit is used for providing analog lightning impulse voltage for the insulating lead on the tower; the power frequency current source unit is connected to the insulating support on the tower on the other side through a third insulating wire, and is used for providing set power frequency current for the insulating wire on the tower after the impulse voltage unit generates the simulated lightning impulse voltage and passes a first preset time period; the data acquisition unit is used for acquiring lightning overvoltage and wire current on the insulated wire. Through the technical scheme in this application, puncture insulating back at simulation lightning impulse voltage, provide lasting power frequency current for the electric arc that produces to improve the authenticity of thunderbolt broken string test.
Description
Technical Field
The application relates to the technical field of lightning stroke tests, in particular to a 10kV power distribution network insulated conductor lightning stroke broken line simulation test platform.
Background
With the large-area transformation of a power distribution network, more and more power distribution network lines are transformed from bare conductors to insulated conductors, and for the power distribution network formed by the insulated conductors, lightning breakage is the main cause of engine power distribution network faults. For the existing power distribution network, because there is a lightning protection device on the line, therefore, the existence time of the lightning current on the insulated line is short, after the insulated layer of the insulated line is punctured, usually, the insulated line is blown due to the continuous power frequency current, therefore, the performance of the insulated wire after lightning strike needs to be researched to prevent the insulated wire from being blown due to the power frequency current.
In the prior art, due to the lack of a corresponding lightning stroke disconnection test platform, the existing lightning stroke disconnection test of the insulated conductor is artificially divided into two parts, one part is a lightning impulse test, the other part is a power frequency current combustion test, and the electric arc combustion result of the insulated conductor is researched through the two parts of tests.
Disclosure of Invention
The purpose of this application lies in: after the simulated lightning impulse voltage is released, continuous power frequency current is provided for the insulated conductor, so that the authenticity of lightning stroke broken line test data is improved.
The technical scheme of the application is as follows: the utility model provides a 10kV distribution network insulated conductor thunderbolt broken string analogue test platform, this analogue test platform includes: the device comprises an impulse voltage unit, a simulation tower line unit, a power frequency current source unit and a data acquisition unit; the simulation tower wire unit comprises at least three towers, the towers are sequentially arranged, the top ends of the towers are provided with insulating support columns, two adjacent towers are connected through insulating leads, and the insulating leads are connected to the insulating support columns; the impulse voltage unit is connected to the insulating support column on the tower on one side through an insulating lead, and the impulse voltage unit is used for providing analog lightning impulse voltage for the insulating lead on the tower; the power frequency current source unit is connected to the insulating support on the tower on the other side through an insulating wire, and is used for providing set power frequency current for the insulating wire on the tower after the impulse voltage unit generates the simulated lightning impulse voltage and passes a first preset time period; the first end of the data acquisition unit is connected to the impulse voltage unit, the second end of the data acquisition unit is connected to the power frequency current source unit, and the data acquisition unit is used for acquiring lightning overvoltage on the insulated wire and wire current flowing through the insulated wire.
In any one of the foregoing technical solutions, further, the power frequency current source unit specifically includes: the charging system comprises a first switch, an energy storage capacitor, a second switch, a charging power supply and a controller, wherein the first switch, the energy storage capacitor and the second switch are arranged in a group; the energy storage capacitor is connected in series between the first switch and the second switch and is recorded as a power frequency current source, at least two groups of power frequency current sources are sequentially connected in parallel, the discharge end of each power frequency current source is connected to the insulated wire, and the charge end of each power frequency current source is connected to the charging power supply; the first end of the controller is connected to the first switch, the second end of the controller is connected to the second switch, the controller is configured to control the first switch to be switched on and switched off according to the charging instruction, and the controller is further configured to sequentially control the second switch to be switched on and switched off according to the discharging instruction and a second preset time period.
In any one of the above technical solutions, further, the method further includes: a reactor; the reactor is connected in series between the simulation tower wire unit and the power frequency current source unit through an insulated conductor.
In any one of the above technical solutions, further, the data acquisition unit specifically includes: the optical fiber isolation acquisition device comprises a Rogowski coil, a resistor voltage divider, an optical fiber isolation acquisition unit and a data display unit; the Rogowski coil is penetrated by an insulated wire, the data output end of the Rogowski coil is connected with the first input end of the optical fiber isolation acquisition unit, and the Rogowski coil is used for detecting the current of the wire flowing through the insulated wire; the resistance voltage divider is connected between the discharge end of the impulse voltage unit and the grounding end of the broken wire simulation test platform, the data output end of the resistance voltage divider is connected to the second input end of the optical fiber isolation acquisition unit, and the resistance voltage divider is used for detecting lightning overvoltage on the insulated wire; the output end of the optical fiber isolation acquisition unit is connected to the input end of the data display unit, and the optical fiber isolation acquisition unit is used for carrying out photoelectric conversion on detected wire current and lightning overvoltage and then transmitting the converted current and lightning overvoltage to the data display unit.
In any one of the above technical solutions, further, the power frequency current source unit specifically further includes: a protection circuit unit; the protection circuit unit is arranged at the output end of the power frequency current source unit and comprises two voltage-stabilizing protection elements, a charging capacitor and matching impedance, the first voltage-stabilizing protection element is connected with the charging capacitor in series, the second voltage-stabilizing protection element is connected to the two ends of the first voltage-stabilizing protection element and the charging capacitor in parallel, the matching impedance is connected to the two ends of the charging capacitor in parallel, and the protection circuit unit is used for protecting the power frequency current source unit from being damaged due to discharge breakdown of lightning overvoltage.
In any one of the above technical solutions, further, the method further includes: a ground fall prevention device; the ground falling prevention device comprises an insulating wire and a locking ring, one end of the insulating wire is connected to the pole tower, the other end of the insulating wire is connected to the locking ring, the locking ring is sleeved on the insulating wire, and the ground falling prevention device is used for pulling the insulating wire after the insulating wire is disconnected.
In any one of the above technical solutions, further, the locking rings of the anti-falling device are installed on both sides of the insulating support, and the distance between the locking ring and the insulating support is 230mm to 270 mm.
The beneficial effect of this application is:
the existing lightning stroke broken line simulation test mainly adopts a lightning impulse test and a power frequency arc burning test to be carried out separately, and also adopts the condition that multiple times of impulse current equivalently replace power frequency follow current of actual arcing, the whole process of the lightning stroke broken line cannot be simulated, namely, firstly, the gap of an insulating support and the insulating layer of an insulating lead are punctured by impulse voltage, then, the insulating lead is blown by the power frequency current follow current, and a power frequency power supply and the impulse power supply are matched in the test process, but a general power frequency power supply can be damaged under the action of the impulse voltage. The power frequency current is generated by oscillation of the capacitor bank and the reactor, the power frequency current has the effect of withstanding impulse voltage, meanwhile, a time sequence matching method is adopted, multiple groups of capacitors are used for switching and discharging in sequence, the power frequency current with enough duration is guaranteed to be generated, and the follow current process after breakdown of the insulated conducting wire can be effectively simulated.
The existing test method can be used for testing the lightning stroke disconnection protection device for limiting the overvoltage, and testing whether the overvoltage can be effectively limited. But to another kind of device of protection thunderbolt broken string, through preventing that the electric arc from burning the arc on insulating wire a bit lasts, this kind of test platform can't go on, and adopt the test platform of this application can carry out experimental test to this kind of device, verify the broken string effect of preventing of this kind of device.
The electromagnetic force that can produce because the heavy current effect in the test process has been considered in this application, and the insulated wire takes place to swing behind the broken string and probably collides other equipment, causes the damage, has designed a device that prevents falling to the ground at the shaft tower tip, can hold insulated wire behind the broken string, considers the thunderbolt rule of breaking the string simultaneously, guarantees that the mounted position can effectively work outside the broken string scope, guarantees to prevent falling to the ground device behind the broken string.
Drawings
The advantages of the above and/or additional aspects of the present application 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 diagram of a 10kV distribution network insulated conductor lightning strike broken simulation test platform according to one embodiment of the application;
FIG. 2 is a schematic diagram of a protection current unit according to one embodiment of the present application;
fig. 3 is a schematic view of a fall arrest device according to one embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. 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 application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
The first embodiment is as follows:
the first embodiment of the present application will be described below with reference to fig. 1 to 3.
As shown in fig. 1, this embodiment provides a 10kV distribution network insulated conductor lightning stroke broken simulation test platform, and the simulation test platform includes: the device comprises an impulse voltage unit, a simulation tower line unit, a power frequency current source unit and a data acquisition unit; the simulation tower wire unit comprises at least three towers 13, the towers 13 are sequentially arranged, the top ends of the towers 13 are provided with insulating support posts 17, two adjacent towers 13 are connected through insulating leads 18, and the insulating leads 18 are connected to the insulating support posts 17; the impulse voltage unit is connected with an insulating support column 17 on one side of the tower 13 through an insulating lead 18 and is used for providing analog lightning impulse voltage for the insulating lead 18 on the tower 13;
preferably, the surge voltage unit specifically includes: a shock ignition ball gap 8, a capacitor bank 16, a wave head resistor 9, a wave tail resistor 10 and a power supply 15; the impulse ignition ball gap 8 is arranged at the discharge end of the impulse voltage unit, the impulse ignition ball gap 8 is connected to the grounding end of the impulse voltage unit through a wave head resistor 9 and a wave tail resistor 10, a power supply end of the impulse voltage unit is arranged between the wave head resistor 9 and the wave tail resistor 10, and the power supply end is connected to a power supply 15; the capacitor bank 16 is connected in parallel across the tail resistor 10.
Specifically, when the desired simulated lightning surge voltage is generated by the surge voltage unit, the capacitor bank 16 is first charged by the power supply 15, and the power supply 15 is disconnected after the charging is completed to prevent the circuit discharge from causing a surge to the power supply 15. Then, the resistance values of the wave head resistor 9 and the wave tail resistor 10 are adjusted to form a waveform of the required simulated lightning impulse voltage, and finally, the ball gap after the impact point in the impact ignition ball gap 11 is adjusted to discharge, and the simulated lightning impulse voltage is transmitted to the insulated wire 18.
In this embodiment, the power frequency current source unit is connected to the insulating support column 17 on the tower 13 on the other side through the insulating wire 18, and the power frequency current source unit is configured to provide a set power frequency current to the insulating wire 18 on the tower 13 after the impulse voltage unit generates the simulated lightning impulse voltage and a first preset time period elapses;
further, the power frequency current source unit specifically includes: the charging system comprises a first switch 1, an energy storage capacitor 3, a second switch 11, a charging power supply 2 and a controller which are arranged in a group; the energy storage capacitor 3 is connected in series between the first switch 1 and the second switch 11 and is recorded as a power frequency current source, at least two groups of power frequency current sources are sequentially connected in parallel, the discharge end of each power frequency current source is connected to the insulated wire 18, and the charge end of each power frequency current source is connected to the charging power supply 2; the first end of the controller is connected to the first switch 1, the second end of the controller is connected to the second switch 11, the controller is configured to control the first switch 1 to be switched on and off according to a charging instruction, and the controller is further configured to sequentially control the second switch 11 to be switched on and off according to a discharging instruction and according to a second preset time period.
Specifically, a first switch 1, an energy storage capacitor 3 and a second switch 11 are connected in series to form a group of power frequency current sources, then the formed groups of power frequency current sources are connected in parallel to form a power frequency current source unit, when the power frequency current source unit is used for providing continuous power frequency current, firstly, a controller controls the first switch 1 to be closed according to a charging instruction, a charging power supply 2 is connected, the energy storage capacitor 3 is charged by the charging power supply 2, after the charging is finished, the controller disconnects the first switch 1, then, when an ignition ball gap 8 releases simulated lightning impulse voltage, after a first preset time period T1, the controller controls the second switch 11 in the first group of power frequency current sources to be closed according to a discharging instruction in a second preset time period T2, the energy storage capacitor 3 in the first group of power frequency current sources provides continuous power frequency current for the analog tower line unit, after discharging for a period of time, the controller controls the second switch 11 in the first group of power frequency current sources to be switched off and the second switch 11 in the second group of power frequency current sources to be switched on, the energy storage capacitor 3 in the second group of power frequency current sources continues to provide continuous power frequency current for the analog tower line unit, and the third group of power frequency current sources are sequentially switched on to provide continuous power frequency current for the analog tower line unit within a second preset time period T2.
The power frequency current unit can release the power frequency current value to be adjusted by adjusting the charging power supply 15 and the energy storage capacitor 3.
Further, the simulation test platform further comprises: a reactor 4; the reactor 4 is connected in series between the analog tower wire unit and the power frequency current source unit through an insulated conductor 18.
Specifically, the reactor forms an oscillating circuit with the energy storage capacitor 3 in the power frequency current source unit, and when the gradient of the voltage in the insulated wire can be reduced, the power frequency current source unit can be protected, so that the safety of the simulation test platform is further improved.
In this embodiment, the first end of the data acquisition unit is connected to the impulse voltage unit, the second end of the data acquisition unit is connected to the power frequency current source unit, and the data acquisition unit is used for acquiring lightning overvoltage on the insulated wire 18 and wire current flowing through the insulated wire 18.
Further, the data acquisition unit specifically includes: the system comprises a Rogowski coil 5, a resistor voltage divider 7, an optical fiber isolation acquisition unit 6 and a data display unit 12; the Rogowski coil 5 is penetrated by an insulated wire 18, the data output end of the Rogowski coil 5 is connected with the first input end of the optical fiber isolation acquisition unit 6, and the Rogowski coil 5 is used for detecting the wire current flowing through the insulated wire 18; the resistance voltage divider 7 is connected between the discharge end of the impulse voltage unit and the grounding end of the broken line simulation test platform, the data output end of the resistance voltage divider 7 is connected to the second input end of the optical fiber isolation acquisition unit 6, and the resistance voltage divider 7 is used for detecting lightning overvoltage on the insulated wire 18; the output end of the optical fiber isolation acquisition unit 6 is connected to the input end of the data display unit 12, and the optical fiber isolation acquisition unit 6 is used for performing photoelectric conversion on the detected wire current and lightning overvoltage and then transmitting the converted current and lightning overvoltage to the data display unit 12.
Specifically, a rogowski coil 5 is provided on the insulated wire 18 for detecting a wire current flowing through the insulated wire 18 and transmitting the detected wire current to the fiber optic isolation collection unit 6. And a resistor voltage divider 7 is arranged at the discharge end of the impulse voltage unit and used for detecting the lightning overvoltage on the insulated wire and transmitting the detected lightning overvoltage to the optical fiber isolation acquisition unit 6. The optical fiber isolation acquisition unit 6 performs photoelectric signal conversion on the received wire current and lightning overvoltage, and then transmits the converted acquisition signal to the data display unit 12, such as an oscilloscope, for data output, and protects the data display unit 12 to prevent high voltage from being introduced into the data display unit 12.
Further, the power frequency current source unit specifically further includes: a protection circuit unit; the protection circuit unit is arranged at the output end of the power frequency current source unit, the protection circuit unit comprises two voltage-stabilizing protection elements, a capacitor 23 and a matching impedance 24, the first voltage-stabilizing protection element 21 is connected with the capacitor 23 in series, the second voltage-stabilizing protection element 22 is connected with the two ends of the first voltage-stabilizing protection element 21 and the two ends of the capacitor 23 in parallel, the matching impedance 24 is connected with the two ends of the capacitor 23 in parallel, and the protection circuit unit is used for preventing the power frequency current source unit from being burnt due to lightning overvoltage.
Specifically, as shown in fig. 2, the protection circuit unit is disposed at the output end of the power frequency current unit, and is configured to perform an abnormal large voltage protection on the power frequency current source, where the first voltage stabilization protection element 21 and the second voltage stabilization protection element 22 play a role of voltage clamping, the withstand voltage of the first voltage stabilization protection element 21 is smaller than the withstand voltage of the second voltage stabilization protection element 22, when an overcurrent occurs in the circuit, the first voltage stabilization protection element 21 is first turned on, the capacitor 23 is charged, the matching impedance 24 can reduce the impact steepness, the voltage of the capacitor 23 rises, and when the sum of the voltages of the capacitor 23 and the first voltage stabilization protection element 21 is greater than the withstand voltage of the second voltage stabilization protection element 22, the second voltage stabilization protection element 22 is turned on, that is, the overvoltage energy can be released from two branches. After the capacitor 23 is charged and the voltage reaches a certain value, the withstand voltage across the first voltage stabilization protection element 21 decreases, and the first voltage stabilization protection element 21 is turned off.
Further, as shown in fig. 3, the simulation test platform further includes: a ground fall prevention device; the anti-falling device comprises an insulated wire 25 and a locking ring 26, one end of the insulated wire 25 is connected to the tower 13, the other end of the insulated wire 25 is connected to the locking ring 26, the locking ring 26 is sleeved on the insulated wire 18, and the anti-falling device is used for pulling the insulated wire 18 after the insulated wire 18 is disconnected.
Further, locking rings 26 of the ground fall preventing means are installed at both sides of the insulating post 17, and the distance between the locking rings 26 and the insulating post 17 is 230mm to 270 mm.
Preferably, the simulation test platform further comprises: and an image acquisition device 14 for acquiring corresponding state images when the insulated conductor 18 transmits the lightning overvoltage and the conductor current.
Example two:
on the basis of the 10kV power distribution network insulated conductor lightning stroke disconnection simulation test platform in the first embodiment, the simulation test platform can also be provided with a plurality of groups of simulation tower line units, a time sequence control unit is arranged between the simulation tower line units and the power frequency current units, the time sequence control unit controls the conduction between the plurality of groups of simulation tower line units and the power frequency current units according to a third preset time period, and therefore the comparison test of continuous power frequency current after the plurality of groups of insulated conductors are struck by lightning is simulated at the same time, and the efficiency of the lightning stroke disconnection test is improved.
Preferably, this simulation test platform is provided with multiunit simulation tower line unit, and the simulation test platform still includes: a timing control unit; the time sequence control unit is arranged between the simulation tower line unit and the power frequency current unit and is configured to control conduction between the multiple groups of simulation tower line units and the power frequency current unit according to a third preset time period.
Specifically, two groups of simulated tower line units are arranged on the simulation test platform, the third preset time period is divided into a first conduction time period td1 and a second conduction time period td2, i.e., for a first on-period td1, the timing control unit is configured to couple the first and second sets of simulated tower line cells, and is conducted with the power frequency current unit, the power frequency current unit supplies power to the two groups of simulation tower wire units by power frequency current, when the second conduction time period td2 is reached, the timing control unit is configured to disconnect the first analog tower line unit from the power frequency current unit, and the second simulation tower line unit is kept conducted with the power frequency current unit, the power frequency current unit continuously accesses the second simulation tower line unit to supply power frequency current, the test data of two different insulated wires under the condition of lightning breakage can be obtained simultaneously, and the test efficiency is improved.
The technical scheme of this application has been explained in detail in the above combination of the figure, and this application provides a 10kV distribution network insulated conductor thunderbolt broken string analogue test platform, includes: the device comprises an impulse voltage unit, a simulation tower line unit, a power frequency current source unit and a data acquisition unit; the simulation tower wire unit comprises at least three towers, the towers are sequentially arranged, the top ends of the towers are provided with insulating support columns, two adjacent towers are connected through insulating leads, and the insulating leads are connected to the insulating support columns; the impulse voltage unit is connected to the insulating support column on the tower on one side through an insulating lead, and the impulse voltage unit is used for providing analog lightning impulse voltage for the insulating lead on the tower; the power frequency current source unit is connected to the insulating support on the tower on the other side through an insulating wire, and is used for providing set power frequency current for the insulating wire on the tower after the impulse voltage unit generates the simulated lightning impulse voltage and passes a first preset time period; the first end of the data acquisition unit is connected to the impulse voltage unit, the second end of the data acquisition unit is connected to the power frequency current source unit, and the data acquisition unit is used for acquiring lightning overvoltage on the insulated wire and wire current flowing through the insulated wire. Through the technical scheme in this application, after releasing simulation lightning impulse voltage, for insulated conductor provides lasting power frequency current to improve the authenticity of thunderbolt broken string test data.
The steps in the present application may be sequentially adjusted, combined, and subtracted according to actual requirements.
The units in the device can be merged, divided and deleted according to actual requirements.
Although the present application has been disclosed in detail with reference to the accompanying drawings, it is to be understood that such description is merely illustrative and not restrictive of the application of the present application. The scope of the present application is defined by the appended claims and may include various modifications, adaptations, and equivalents of the invention without departing from the scope and spirit of the application.
Claims (6)
1. The utility model provides a 10kV distribution network insulated conductor thunderbolt broken string analogue test platform which characterized in that, analogue test platform includes: the device comprises an impulse voltage unit, a simulation tower line unit, a power frequency current source unit and a data acquisition unit;
the simulation tower line unit comprises at least three towers (13), the towers (13) are sequentially arranged, the top ends of the towers (13) are provided with insulating support columns (17), two adjacent towers (13) are connected through insulating leads (18), and the insulating leads (18) are connected to the insulating support columns (17);
the impulse voltage unit is connected to the insulating support column (17) on the tower (13) on one side through the insulating lead (18), and is used for providing a simulated lightning impulse voltage for the insulating lead (18) on the tower (13), wherein the impulse voltage unit specifically comprises: the device comprises a shock ignition ball gap (8), a capacitor bank (16), a wave head resistor (9), a wave tail resistor (10) and a power supply (15); the impact ignition ball gap (8) is arranged at the discharge end of the impact voltage unit, the impact ignition ball gap (8) is connected to the grounding end of the impact voltage unit through the wave head resistor (9) and the wave tail resistor (10), a power supply end of the impact voltage unit is arranged between the wave head resistor (9) and the wave tail resistor (10), and the power supply end is connected to the power supply (15); the capacitor bank (16) is connected in parallel with two ends of the wave tail resistor (10);
the power frequency current source unit is connected to the insulating support column (17) on the tower (13) on the other side through the insulating wire (18), and the power frequency current source unit is used for providing set power frequency current for the insulating wire (18) on the tower (13) after the impulse voltage unit generates simulated lightning impulse voltage and passes through a first preset time period, wherein the power frequency current source unit specifically comprises: the device comprises a first switch (1), an energy storage capacitor (3) and a second switch (11) which are arranged in a group, a charging power supply (2) and a controller;
the energy storage capacitor (3) is connected in series between the first switch (1) and the second switch (11) and is recorded as a power frequency current source, at least two groups of power frequency current sources are sequentially connected in parallel, the discharge end of each power frequency current source is connected to the insulated wire (18), and the charge end of each power frequency current source is connected to the charging power supply (2);
the first end of the controller is connected to the first switch (1), the second end of the controller is connected to the second switch (11), the controller is configured to control the first switch (1) to be switched on and off when charging, and the controller is further configured to sequentially control the second switch (11) to be switched on and off according to a second preset time period when discharging;
the first end of the data acquisition unit is connected to the impulse voltage unit, the second end of the data acquisition unit is connected to the power frequency current source unit, and the data acquisition unit is used for acquiring lightning overvoltage on the insulated wire (18) and wire current flowing through the insulated wire (18).
2. The 10kV power distribution network insulated conductor lightning strike breakage simulation test platform of claim 1, further comprising: a reactor (4);
the reactor (4) is connected in series between the analog tower line unit and the power frequency current source unit through the insulated conductor (18).
3. The 10kV power distribution network insulated conductor lightning strike wire breakage simulation test platform of claim 1, wherein the data acquisition unit specifically comprises: the system comprises a Rogowski coil (5), a resistor voltage divider (7), an optical fiber isolation acquisition unit (6) and a data display unit (12);
the Rogowski coil (5) is penetrated by the insulated conducting wire (18), the data output end of the Rogowski coil (5) is connected to the first input end of the optical fiber isolation acquisition unit (6), and the Rogowski coil (5) is used for detecting the conducting wire current flowing through the insulated conducting wire (18);
the resistance voltage divider (7) is connected between the discharge end of the impulse voltage unit and the grounding end of the broken line simulation test platform, the data output end of the resistance voltage divider (7) is connected to the second input end of the optical fiber isolation acquisition unit (6), and the resistance voltage divider (7) is used for detecting the lightning overvoltage on the insulated wire (18);
the output end of the optical fiber isolation acquisition unit (6) is connected to the input end of the data display unit (12), and the optical fiber isolation acquisition unit (6) is used for carrying out photoelectric conversion on the detected wire current and the lightning overvoltage and then transmitting the converted current to the data display unit (12).
4. The 10kV power distribution network insulated conductor lightning strike breakage simulation test platform of claim 1, wherein the power frequency current source unit further comprises: a protection circuit unit;
the protection circuit unit is arranged at the output end of the power frequency current source unit and comprises two voltage-stabilizing protection elements, a charging capacitor (23) and a matching impedance (24),
the lightning protection circuit comprises a first voltage-stabilizing protection element (21), a second voltage-stabilizing protection element (22), a first charging capacitor (23), a second charging capacitor (23), a matching impedance (24) and a protection circuit unit, wherein the first voltage-stabilizing protection element (21) is connected in series with the charging capacitor (23), the second voltage-stabilizing protection element is connected in parallel with two ends of the first voltage-stabilizing protection element (21) and the charging capacitor (23), the matching impedance (24) is connected in parallel with two ends of the charging capacitor (23), and the protection circuit unit is used for protecting the power frequency.
5. The 10kV power distribution network insulated conductor lightning strike breakage simulation test platform of claim 1, further comprising: a ground fall prevention device;
the anti-falling device comprises an insulated wire (25) and a lock ring (26), one end of the insulated wire (25) is connected to the tower (13), the other end of the insulated wire (25) is connected to the lock ring (26), the lock ring (26) is sleeved on the insulated wire (18), and the anti-falling device is used for pulling the insulated wire (18) after the insulated wire (18) is disconnected.
6. The 10kV power distribution network insulated conductor lightning strike disconnection simulation test platform according to claim 5, wherein the locking rings (26) of the ground protection device are installed on two sides of the insulating support pillar (17), and the distance between the locking rings (26) and the insulating support pillar (17) is 230mm to 270 mm.
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| CN110161292A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of distribution line ground fault voltage signal acquisition device |
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| CN110456237A (en) * | 2019-07-19 | 2019-11-15 | 清华大学 | Reduce the system and method for Injection Current waveform wave head time in the artificial lightning stroke experiment in transmission line of electricity scene |
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