CN108957265B - Device and method for testing VFTO flashover characteristic decline rate of porcelain bushing in high condensation area - Google Patents
Device and method for testing VFTO flashover characteristic decline rate of porcelain bushing in high condensation area Download PDFInfo
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- CN108957265B CN108957265B CN201810980626.1A CN201810980626A CN108957265B CN 108957265 B CN108957265 B CN 108957265B CN 201810980626 A CN201810980626 A CN 201810980626A CN 108957265 B CN108957265 B CN 108957265B
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- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 97
- 238000012360 testing method Methods 0.000 title claims abstract description 48
- 238000009833 condensation Methods 0.000 title claims abstract description 32
- 230000005494 condensation Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000007423 decrease Effects 0.000 title claims abstract description 6
- 238000004088 simulation Methods 0.000 claims abstract description 59
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 37
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- 238000012546 transfer Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 7
- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 5
- 239000003595 mist Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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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
Abstract
The embodiment of the application discloses a high condensation area porcelain bushing VFTO flashover characteristic decline rate test device and method, including: signal generation controller, VFTO generating device and climate simulation device, wherein: the signal generation controller is electrically connected with a signal input end of a VFTO pulse generation unit in the VFTO generation device, and a signal output end of the VFTO pulse generation unit is connected with the climate simulation device; the climate simulation device comprises a climate simulation box, a porcelain bushing, a test bed, a humidity sensor, a humidity display, a transformer, a pressure regulating knob, a humidifying device, a spraying device and a camera. The porcelain sleeve is arranged in the climate simulation device, the environment of a high condensation area is simulated, then the VFTO pulse signal is generated by the VFTO generation device to act on the porcelain sleeve, after the action is finished, the voltage on the porcelain sleeve is regulated to enable the surface of the porcelain sleeve to flashover, the reduction rate of the VFTO flashover characteristic is obtained, and the influence on the porcelain sleeve is obtained by combining a camera to shoot the image of the porcelain sleeve.
Description
Technical Field
The application relates to the technical field of porcelain bushing surface flashover characteristic detection, in particular to a device and a method for testing the VFTO flashover characteristic reduction rate of a porcelain bushing in a high condensation area.
Background
With the development of the power grid in China, the use quantity of various power equipment in a power system is huge, and the porcelain bushing is used as an internal insulation container and is in a high condensation environment for a long time, so that the performance of the porcelain bushing is affected to a certain extent. When the high-voltage equipment is operated, because the switching speed of the switch is low, pre-breakdown and repeated reburning can occur between the switch contacts when capacitive current is switched on, and a shock wave with short rising time is formed. The shock wave forms a rapid transient oscillation, namely a very fast transient overvoltage (VFTO, very Fast Transient Overvoltage) signal through multiple reflections and refractions. The VFTO signal can greatly reduce the performance of the porcelain bushing, cause cracking of the insulator and even cause explosion of the insulator, seriously jeopardize the safe and reliable operation of a power system and cause great damage to social economy.
At present, the domestic research on VFTO is less, and the used equipment has the defects of huge volume, insufficient voltage level, larger loop inductance, serious waveform distortion and the like. Therefore, the influence of the VFTO on the insulating porcelain sleeve in the high condensation area cannot be known, so that hidden danger exists in the safe operation of the power system.
Disclosure of Invention
The application provides a device and a method for testing the VFTO flashover characteristic decline rate of a porcelain bushing in a high condensation area, which are used for solving the problems in the prior art.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
a high condensation area porcelain bushing VFTO flashover characteristic decline rate test device includes: signal generation controller, VFTO generating device and climate simulation device, wherein: the signal output end of the signal generation controller is connected with the input end of the VFTO generating device, the output end of the VFTO generating device is connected with the climate simulating device, and the VFTO generating device is used for generating high-voltage pulses and loading the high-voltage pulses onto the climate simulating device; the signal generation controller comprises a master console, a pulse amplitude control channel and a trigger control module, wherein the pulse amplitude control channel is respectively and electrically connected with the master console and the trigger control module; the VFTO generating device comprises a high-voltage shielding box and a VFTO pulse generating unit, wherein the VFTO pulse generating unit is arranged in the high-voltage shielding box, the signal input end of the VFTO pulse generating unit is electrically connected with the trigger control module, the signal output end of the VFTO pulse generating unit is electrically connected with the first end of a VFTO pulse cable, and the second end of the VFTO pulse cable is connected with the climate simulation device; the climate simulation device comprises a climate simulation box, a porcelain bushing, a test bed, a humidity sensor, a humidity display, a transformer, a pressure regulating knob, a humidifying device, a spraying device and a camera, wherein the test bed is arranged in the climate simulation box, the porcelain bushing is arranged on the test bed, the humidity sensor and the transformer are respectively connected with the porcelain bushing, the humidity display, the pressure regulating knob and the humidifying device are arranged outside the climate simulation box, the humidity display is electrically connected with the humidity sensor, the pressure regulating knob is electrically connected with the transformer, the spraying device is arranged in the climate simulation box and is communicated with the humidifying device, and the camera is arranged in the climate simulation box with a shooting opening of the camera facing the porcelain bushing.
Optionally, the VFTO pulse generating unit includes: the high-voltage silicon stack, first capacitor, second capacitor, third capacitor, first resistor, second resistor, first charging resistor, second charging resistor, first spark gap, second spark gap and wave regulating module, the first end of high-voltage silicon stack with trigger control module is connected, the second end of high-voltage silicon stack respectively with first end of first capacitor, first end of first resistor and first end of first spark gap, the second end of first capacitor with first end of first charging resistor is connected, the second end of first resistor is connected with first end of second resistor, the first end of second spark gap is connected with the second end of first resistor, the second end of first spark gap is connected with the second end of first charging resistor, the second end of second capacitor is connected with the second end of second charging resistor, the second end of second capacitor is connected with the first end of second spark gap is connected with the first end of second capacitor.
Optionally, a steepening gap is arranged outside the high-voltage shielding box, and the steepening gap is respectively connected with the second end of the wave-regulating module and the first end of the VFTO pulse cable.
Optionally, a high-voltage adapter and a high-voltage cable are arranged between the VFTO pulse cable and the climate simulation device, the high-voltage adapter is respectively connected with the first end of the VFTO pulse cable and the first end of the high-voltage cable, and the second end of the high-voltage cable is connected with the porcelain sleeve.
Optionally, a first wall bushing, a second wall bushing and a third wall bushing are arranged on the high-voltage shielding box, two ends of the first wall bushing are respectively connected with the trigger control module and the first end of the high-voltage silicon stack, the first end of the second wall bushing is respectively connected with the second end of the first capacitor and the first end of the first charging resistor, the second end of the first capacitor and the first end of the first charging resistor are grounded through the second end of the second wall bushing, and two ends of the third wall bushing are respectively connected with the second end of the wave regulating module and the steepening gap.
Optionally, the master console includes a pulse trigger control button, a charge trigger control button, an emergency brake button, and a charge time sequence setting button, where the pulse trigger control button, the charge trigger control button, the emergency brake button, and the charge time sequence setting button are electrically connected with the processor of the master console, respectively.
Optionally, the trigger control module includes a switch state display and a power automatic transfer switch, and the switch state display is electrically connected with the power automatic transfer switch.
Optionally, a first insulating baffle is disposed between the steeped gap and the third wall bushing, one end of the third wall bushing is fixedly disposed on the first insulating baffle, a second insulating baffle is disposed between the VFTO pulse cable and the steeped gap, and a first end of the VFTO pulse cable is connected with the second insulating baffle.
Optionally, a fourth wall bushing is arranged on the climate simulation box, and the high-voltage cable passes through the fourth wall bushing and is connected with the porcelain bushing.
A method for testing the VFTO flashover characteristic reduction rate of a porcelain bushing in a high condensation area comprises the following steps: checking whether a power supply automatic transfer switch in the signal generation controller is disconnected; if the automatic power supply change-over switch is turned off, a charging time sequence setting button of the master control console is set for setting charging time, a charging trigger control button is started, the automatic power supply change-over switch is turned on, and after charging is completed, the automatic power supply change-over switch is turned off; opening a humidifying device, spraying water mist to a climate simulation box through a spraying device, and obtaining the humidity in the box obtained by a humidity sensor in the climate simulation box through a humidity display; when the humidity value in the humidity display reaches a preset value, a pulse trigger control button is started to control the VFTO generating device to generate a VFTO pulse signal, and the VFTO pulse signal acts on the porcelain sleeve; after the action is finished, the voltage regulating knob is operated to regulate the voltage of the transformer, so that flashover occurs on the surface of the porcelain bushing, and the flashover voltage drop rate is obtained; in the process of flashover on the surface of the test porcelain bushing, a camera is controlled to shoot real-time pictures of the porcelain bushing, multiple groups of shot pictures are repeatedly acquired, and the influence of the VFTO on the flashover of the porcelain bushing in the high condensation area is analyzed jointly by combining the flashover voltage reduction rate and the multiple groups of shot pictures.
According to the technical scheme, the device and the method for testing the VFTO flashover characteristic reduction rate of the porcelain bushing in the high condensation area provided by the embodiment of the application comprise the following steps: signal generation controller, VFTO generating device and climate simulation device, wherein: the signal output end of the signal generation controller is connected with the input end of the VFTO generating device, the output end of the VFTO generating device is connected with the climate simulating device, and the VFTO generating device is used for generating high-voltage pulses and loading the high-voltage pulses onto the climate simulating device; the signal generation controller comprises a master console, a pulse amplitude control channel and a trigger control module, wherein the pulse amplitude control channel is respectively and electrically connected with the master console and the trigger control module; the VFTO generating device comprises a high-voltage shielding box and a VFTO pulse generating unit, wherein the VFTO pulse generating unit is arranged in the high-voltage shielding box, the signal input end of the VFTO pulse generating unit is electrically connected with the trigger control module, the signal output end of the VFTO pulse generating unit is electrically connected with the first end of a VFTO pulse cable, and the second end of the VFTO pulse cable is connected with the climate simulation device; the climate simulation device comprises a climate simulation box, a porcelain bushing, a test bed, a humidity sensor, a humidity display, a transformer, a pressure regulating knob, a humidifying device, a spraying device and a camera, wherein the test bed is arranged in the climate simulation box, the porcelain bushing is arranged on the test bed, the humidity sensor and the transformer are respectively connected with the porcelain bushing, the humidity display, the pressure regulating knob and the humidifying device are arranged outside the climate simulation box, the humidity display is electrically connected with the humidity sensor, the pressure regulating knob is electrically connected with the transformer, the spraying device is arranged in the climate simulation box and is communicated with the humidifying device, and the camera is arranged in the climate simulation box with a shooting opening of the camera facing the porcelain bushing. The porcelain sleeve is arranged in the climate simulation device, the environment of a high condensation area is simulated, then the VFTO pulse signal is generated by the VFTO generation device to act on the porcelain sleeve, after the action is finished, the voltage on the porcelain sleeve is regulated to enable the surface of the porcelain sleeve to flashover, the reduction rate of the VFTO flashover characteristic is obtained, and the influence on the porcelain sleeve is obtained by combining a camera to shoot the image of the porcelain sleeve.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a device for testing the VFTO flashover characteristic of a porcelain bushing in a high condensation area according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a method for testing the VFTO flashover characteristic of a porcelain bushing in a high condensation area according to an embodiment of the present application;
in fig. 1-2, the symbols are represented as: 1-signal generation controller, 2-VFTO generator, 3-climate simulation device, 4-master console, 5-pulse amplitude control channel, 6-trigger control module, 7-high voltage shielding box, 8-VFTO pulse generation unit, 9-VFTO pulse cable, 10-climate simulation box, 11-porcelain bushing, 12-test bench, 13-humidity sensor, 14-humidity display, 15-transformer, 16-voltage regulating knob, 17-humidifying device, 18-spraying device, 19-camera, 20-high voltage silicon stack, 21-first capacitor, 22-second capacitor, 23-third capacitor, 24-first resistor, 25-second resistor, 26-first charging resistor, 27-second charging resistor, 28-first spark gap, 29-second spark gap, 30-wave regulating module, 31-steepening gap, 32-high voltage adapter, 33-high voltage cable, 34-first wall bushing, 35-second wall bushing, 36-third wall bushing, 37-pulse triggering control button, 38-charging triggering control button, 39-emergency braking button, 40-charging time series setting button, 41-switch state display, 42-power automatic transfer switch, 43-first insulating barrier, 44-second insulating barrier, 45-fourth wall bushing.
Detailed Description
The present application is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the device for testing the VFTO flashover characteristic reduction rate of the porcelain bushing in the high condensation area is provided. Referring to fig. 1, the device for testing the degradation rate of the flashover characteristics of the porcelain bushing VFTO in the high condensation area comprises: a signal generation controller 1, a VFTO generation device 2, and a climate simulation device 3, wherein: the signal output end of the signal generation controller 1 is connected with the input end of the VFTO generating device 2, the output end of the VFTO generating device 2 is connected with the climate simulating device 3, and the VFTO generating device 2 is used for generating high-voltage pulses and loading the high-voltage pulses on the climate simulating device 3.
The signal generation controller 1 comprises a master console 4, a pulse amplitude control channel 5 and a trigger control module 6, wherein the pulse amplitude control channel 5 is respectively and electrically connected with the master console 4 and the trigger control module 6.
The master console 4 comprises a pulse triggering control button 37, a charging triggering control button 38, an emergency braking button 39 and a charging time sequence setting button 40, and the pulse triggering control button 37, the charging triggering control button 38, the emergency braking button 39 and the charging time sequence setting button 40 are respectively electrically connected with a processor of the master console 4. The pulse trigger control button 37 controls the emission of a pulse signal, the charge trigger control button 38 controls the charging to the VFTO generating device 2, the emergency brake button 39 controls the signal in emergency, and the charging time series setting button 40 controls the sequence of charging. The trigger control module 6 includes a switch state display 41 and a power automatic transfer switch 42, and the switch state display 41 and the power automatic transfer switch 42 are electrically connected.
The VFTO generating device 2 comprises a high-voltage shielding box 7 and a VFTO pulse generating unit 8, wherein the VFTO pulse generating unit 8 is arranged in the high-voltage shielding box 7, a signal input end of the VFTO pulse generating unit 8 is electrically connected with the trigger control module 6, a signal output end of the VFTO pulse generating unit 8 is electrically connected with a first end of a VFTO pulse cable 9, and a second end of the VFTO pulse cable 9 is connected with the climate simulating device 3.
A steepening gap 31 is arranged outside the high-voltage shielding box 7, and the steepening gap 31 is respectively connected with the second end of the wave-regulating module 30 and the first end of the VFTO pulse cable 9. A first insulating baffle 43 is arranged between the steeped gap 31 and the third wall bushing 36, one end of the third wall bushing 36 is fixedly arranged on the first insulating baffle 43, a second insulating baffle 44 is arranged between the VFTO pulse cable 9 and the steeped gap 31, and the first end of the VFTO pulse cable 9 is connected with the second insulating baffle 44.
A high-voltage adapter 32 and a high-voltage cable 33 are arranged between the VFTO pulse cable 9 and the climate simulation device 3, the high-voltage adapter 32 is respectively connected with the first end of the VFTO pulse cable 9 and the first end of the high-voltage cable 33, and the second end of the high-voltage cable 33 is connected with the porcelain bushing 11.
The VFTO pulse generating unit 8 includes: the high-voltage silicon stack 20, the first capacitor 21, the second capacitor 22, the third capacitor 23, the first resistor 24, the second resistor 25, the first charging resistor 26, the second charging resistor 27, the first spark gap 28, the second spark gap 29 and the wave regulating module 30, wherein the first end of the high-voltage silicon stack 20 is connected with the trigger control module 6, the second end of the high-voltage silicon stack 20 is respectively connected with the first end of the first capacitor 21, the first end of the first resistor 24 and the first end of the first spark gap 28, the second end of the first capacitor 21 is connected with the first end of the first charging resistor 26, the second end of the first resistor 24 is respectively connected with the first end of the second resistor 24, the first end of the second capacitor 22, the first end of the second spark gap 29, the second end of the first spark gap 28 is respectively connected with the first end of the first charging resistor 26, the first end of the second resistor 23 and the first end of the second capacitor 23, the second end of the second capacitor 27 is respectively connected with the first end of the second capacitor 23 and the second end of the second capacitor 29.
The climate simulation device 3 comprises a climate simulation box 10, a porcelain bushing 11, a test bed 12, a humidity sensor 13, a humidity display 14, a transformer 15, a pressure regulating knob 16, a humidifying device 17, a spraying device 18 and a camera 19, wherein the test bed 12 is arranged in the climate simulation box 10, the porcelain bushing 11 is arranged on the test bed 12, the humidity sensor 13 and the transformer 15 are respectively connected with the porcelain bushing 11, the humidity display 14, the pressure regulating knob 16 and the humidifying device 17 are arranged on the outer side of the climate simulation box 10, the humidity display 14 is electrically connected with the humidity sensor 13, the pressure regulating knob 16 is electrically connected with the transformer 15, the spraying device 18 is arranged in the climate simulation box 10, the spraying device 18 is communicated with the humidifying device 17, the camera 19 is arranged in the climate simulation box 10, and a shooting port of the camera 19 faces the porcelain bushing 11.
The high-voltage shielding box 7 is provided with a first wall bushing 34, a second wall bushing 35 and a third wall bushing 36, two ends of the first wall bushing 34 are respectively connected with the trigger control module 6 and the first end of the high-voltage silicon stack 20, the first end of the second wall bushing 35 is respectively connected with the second end of the first capacitor 21 and the first end of the first charging resistor 26, the second end of the first capacitor 21 and the first end of the first charging resistor 26 are grounded through the second end of the second wall bushing 35, and two ends of the third wall bushing 36 are respectively connected with the second end of the wave regulating module 30 and the steepening gap 31.
A fourth wall bushing 45 is disposed on the climate simulation box 10, and the high-voltage cable 33 is connected to the porcelain bushing 11 through the fourth wall bushing 45.
From the above embodiments, it can be seen that the device for testing the VFTO flashover characteristic of the porcelain bushing in high condensation area provided in this embodiment includes: a signal generation controller 1, a VFTO generation device 2, and a climate simulation device 3, wherein: the signal generation controller 1 comprises a master console 4, a pulse amplitude control channel 5 and a trigger control module 6, wherein the pulse amplitude control channel 5 is respectively and electrically connected with the master console 4 and the trigger control module 6; the VFTO generating device 2 comprises a high-voltage shielding box 7 and a VFTO pulse generating unit 8, wherein the VFTO pulse generating unit 8 is arranged in the high-voltage shielding box 7, a signal input end of the VFTO pulse generating unit 8 is electrically connected with the trigger control module 6, a signal output end of the VFTO pulse generating unit 8 is electrically connected with a first end of a VFTO pulse cable 9, and a second end of the VFTO pulse cable 9 is connected with the climate simulating device 3; the climate simulation device 3 comprises a climate simulation box 10, a porcelain bushing 11, a test bed 12, a humidity sensor 13, a humidity display 14, a transformer 15, a pressure regulating knob 16, a humidifying device 17, a spraying device 18 and a camera 19, wherein the test bed 12 is arranged in the climate simulation box 10, the porcelain bushing 11 is arranged on the test bed 12, the humidity sensor 13 and the transformer 15 are respectively connected with the porcelain bushing 11, the humidity display 14, the pressure regulating knob 16 and the humidifying device 17 are arranged on the outer side of the climate simulation box 10, the humidity display 14 is electrically connected with the humidity sensor 13, the pressure regulating knob 16 is electrically connected with the transformer 15, the spraying device 18 is arranged in the climate simulation box 10, the spraying device 18 is communicated with the humidifying device 17, the camera 19 is arranged in the climate simulation box 10, and a shooting port of the camera 19 faces the porcelain bushing 11. The porcelain bushing 11 is arranged in the climate simulation device 3, the environment of a high condensation area is simulated, then the VFTO pulse signal is generated by the VFTO generation device 2 to act on the porcelain bushing 11, after the action is finished, the voltage on the porcelain bushing 11 is regulated to enable the surface of the porcelain bushing 11 to generate flashover, the reduction rate of the flashover characteristics of the VFTO is obtained, and the influence on the porcelain bushing 11 is obtained by combining a camera to shoot a porcelain bushing image.
Referring to fig. 2, the embodiment of the application further provides a method for testing the VFTO flashover characteristic degradation rate of the porcelain bushing in the high condensation area, which comprises the following steps:
s101, checking whether a power supply automatic transfer switch in the signal generation controller is disconnected.
S102, if the automatic power transfer switch is turned off, a charging time sequence setting button of the master console is set, charging time is set, a charging trigger control button is started, the automatic power transfer switch is turned on, and after charging is completed, the automatic power transfer switch is turned off.
S103, opening the humidifying device, spraying water mist to the climate simulation box through the spraying device, and obtaining the humidity in the box obtained by the humidity sensor in the climate simulation box through the humidity display.
And S104, when the humidity value in the humidity display reaches a preset value, starting a pulse trigger control button to control the VFTO generating device to generate a VFTO pulse signal, and enabling the VFTO pulse signal to act on the porcelain sleeve.
And S105, after the action is finished, operating the voltage regulating knob to regulate the voltage of the transformer, so that flashover occurs on the surface of the porcelain bushing, and obtaining the flashover voltage drop rate.
Specifically, the rated voltage grade U used by the porcelain bushing is selected 0 As a starting point, 50% of U t1 ＝50％U 0 And selecting about U t1 As a step-up voltage, i.e. applying voltage U ti ＝[U t1 +(i-1)ΔU]Continuing the test until the flashover phenomenon of the porcelain sleeve occurs, and recording the flashover voltage value U at the moment s ＝U tN N is the number of pressurized intervals; repeating the above process n times, and testing result U s -n is stored. Finally, after the action of VFTO is calculated, the influence of the action on the flashover characteristics of the porcelain bushing is reflected by the flashover voltage reduction rate tau, wherein the calculation formula of tau is as follows:
in U si And the obtained flashover voltage value of the porcelain bushing is tested in the ith test. When the value of tau is below 5%, the insulation performance of the porcelain sleeve is better and is not influenced by the action of VFTO, and when the value of tau is between 5% and 15%, the porcelain sleeve is shownThe insulation performance of the sleeve is reduced to some extent, and when the value of tau is more than 15%, the insulation performance of the porcelain sleeve is obviously reduced, and attention should be paid.
S106, in the process of flashover on the surface of the test porcelain bushing, a camera is controlled to shoot real-time pictures of the porcelain bushing, multiple groups of shooting pictures are repeatedly acquired, and the influence of the VFTO on the flashover of the porcelain bushing in the high condensation area is analyzed jointly by combining the flashover voltage reduction rate and the multiple groups of shooting pictures.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-described embodiments of the present application are not intended to limit the scope of the present application.
Claims (10)
1. The utility model provides a high condensation area porcelain bushing VFTO flashover characteristic decline rate test device which characterized in that includes: a signal generation controller (1), a VFTO generation device (2) and a climate simulation device (3), wherein:
the signal output end of the signal generation controller (1) is connected with the input end of the VFTO generating device (2), the output end of the VFTO generating device (2) is connected with the climate simulating device (3), and the VFTO generating device (2) is used for generating high-voltage pulses and loading the high-voltage pulses onto the climate simulating device (3);
the signal generation controller (1) comprises a master console (4), a pulse amplitude control channel (5) and a trigger control module (6), wherein the pulse amplitude control channel (5) is electrically connected with the master console (4) and the trigger control module (6) respectively;
the VFTO generating device (2) comprises a high-voltage shielding box (7) and a VFTO pulse generating unit (8), wherein the VFTO pulse generating unit (8) is arranged in the high-voltage shielding box (7), a signal input end of the VFTO pulse generating unit (8) is electrically connected with the trigger control module (6), a signal output end of the VFTO pulse generating unit (8) is electrically connected with a first end of a VFTO pulse cable (9), and a second end of the VFTO pulse cable (9) is connected with the climate simulation device (3);
the climate simulation device (3) comprises a climate simulation box (10), a porcelain bushing (11), a test bench (12), a humidity sensor (13), a humidity display (14), a transformer (15), a pressure regulating knob (16), a humidifying device (17), a spraying device (18) and a camera (19), wherein the test bench (12) is arranged in the climate simulation box (10), the porcelain bushing (11) is arranged on the test bench (12), the humidity sensor (13) and the transformer (15) are respectively connected with the porcelain bushing (11), the humidity display (14), the pressure regulating knob (16) and the humidifying device (17) are arranged outside the climate simulation box (10), the humidity display (14) is electrically connected with the humidity sensor (13), the pressure regulating knob (16) is electrically connected with the transformer (15), the spraying device (18) is arranged in the climate simulation box (10), the spraying device (18) is connected with the humidifying device (17) and is arranged towards the camera (19) in the climate simulation box (11).
2. The high condensation area porcelain bushing VFTO flashover characteristic drop rate test device according to claim 1, wherein the VFTO pulse generating unit (8) comprises: a high voltage silicon stack (20), a first capacitor (21), a second capacitor (22), a third capacitor (23), a first resistor (24), a second resistor (25), a first charging resistor (26), a second charging resistor (27), a first spark gap (28), a second spark gap (29) and a wave regulating module (30), a first end of the high voltage silicon stack (20) being connected to the trigger control module (6), a second end of the high voltage silicon stack (20) being connected to a first end of the first capacitor (21), a first end of the first resistor (24) and a first end of the first spark gap (28), a second end of the first capacitor (21) being connected to a first end of the first charging resistor (26), a second end of the first resistor (24) being connected to a first end of the second resistor (25), a first end of the second capacitor (22), a first end of the second capacitor (29) being connected to a first end of the second resistor (26), a first end of the second capacitor (24) being connected to a first end of the second spark gap (28) being connected to a first end of the first resistor (26), the second end of the second resistor (25) is respectively connected with the first end of the third capacitor (23) and the first end of the wave regulating module (30), and the second end of the second charging resistor (27) is respectively connected with the second end of the second spark ball gap (29) and the second end of the third capacitor (23).
3. The device for testing the degradation rate of the flashover characteristics of the porcelain bushing VFTO in the high condensation area according to claim 2, wherein a steepening gap (31) is arranged on the outer side of the high-voltage shielding box (7), and the steepening gap (31) is respectively connected with the second end of the wave-regulating module (30) and the first end of the VFTO pulse cable (9).
4. The device for testing the degradation rate of the flashover characteristics of the porcelain bushing VFTO in the high condensation area according to claim 3, wherein a high-voltage adapter (32) and a high-voltage cable (33) are arranged between the VFTO pulse cable (9) and the climate simulation device (3), the high-voltage adapter (32) is respectively connected with the first end of the VFTO pulse cable (9) and the first end of the high-voltage cable (33), and the second end of the high-voltage cable (33) is connected with the porcelain bushing (11).
5. The high-condensation-area porcelain bushing VFTO flashover characteristic falling rate test device according to claim 4, wherein a first wall bushing (34), a second wall bushing (35) and a third wall bushing (36) are arranged on the high-voltage shielding box (7), two ends of the first wall bushing (34) are respectively connected with the triggering control module (6) and the first end of the high-voltage silicon stack (20), the first end of the second wall bushing (35) is respectively connected with the second end of the first capacitor (21) and the first end of the first charging resistor (26), the second end of the first capacitor (21) and the first end of the first charging resistor (26) are grounded through the second end of the second wall bushing (35), and two ends of the third wall bushing (36) are respectively connected with the second end of the wave regulating module (30) and the steepening gap (31).
6. The high condensation area porcelain bushing VFTO flashover characteristic drop rate test device according to claim 1, wherein the master console (4) comprises a pulse trigger control button (37), a charging trigger control button (38), an emergency brake button (39) and a charging time series setting button (40), and the pulse trigger control button (37), the charging trigger control button (38), the emergency brake button (39) and the charging time series setting button (40) are electrically connected with a processor of the master console (4) respectively.
7. The high condensation area porcelain bushing VFTO flashover characteristic drop rate test device according to claim 5, wherein the trigger control module (6) comprises a switch state display (41) and a power automatic transfer switch (42), and the switch state display (41) and the power automatic transfer switch (42) are electrically connected.
8. The high condensation area porcelain bushing VFTO flashover characteristic drop rate test device according to claim 7, wherein a first insulation baffle (43) is arranged between the steepening gap (31) and the third wall bushing (36), one end of the third wall bushing (36) is fixedly arranged on the first insulation baffle (43), a second insulation baffle (44) is arranged between the VFTO pulse cable (9) and the steepening gap (31), and the first end of the VFTO pulse cable (9) is connected with the second insulation baffle (44).
9. The device for testing the degradation rate of the flashover characteristics of the porcelain bushing VFTO in the high condensation area according to claim 4, wherein a fourth wall bushing (45) is arranged on the climate simulation box (10), and the high-voltage cable (33) is connected with the porcelain bushing (11) through the fourth wall bushing (45).
10. A method for testing the VFTO flashover characteristic of a porcelain bushing in a high condensation area, which is characterized by being applied to the device for testing the VFTO flashover characteristic of the porcelain bushing in the high condensation area according to any one of claims 1 to 9, and comprising the following steps:
checking whether a power supply automatic transfer switch in the signal generation controller is disconnected;
if the automatic power supply change-over switch is turned off, a charging time sequence setting button of the master control console is set for setting charging time, a charging trigger control button is started, the automatic power supply change-over switch is turned on, and after charging is completed, the automatic power supply change-over switch is turned off;
opening a humidifying device, spraying water mist to a climate simulation box through a spraying device, and obtaining the humidity in the box obtained by a humidity sensor in the climate simulation box through a humidity display;
when the humidity value in the humidity display reaches a preset value, a pulse trigger control button is started to control a VFTO generating device to generate a VFTO pulse signal, and the VFTO pulse signal acts on a porcelain bushing;
after the action is finished, the voltage regulating knob is operated to regulate the voltage of the transformer, so that flashover occurs on the surface of the porcelain bushing, and the flashover voltage drop rate is obtained;
in the process of flashover on the surface of the test porcelain bushing, a camera is controlled to shoot real-time pictures of the porcelain bushing, multiple groups of shot pictures are repeatedly acquired, and the influence of the VFTO on the flashover of the porcelain bushing in the high condensation area is analyzed jointly by combining the flashover voltage reduction rate and the multiple groups of shot pictures.
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