CN113608085A - Device and method for testing insulator charge and flashover under electric heating composite field - Google Patents
Device and method for testing insulator charge and flashover under electric heating composite field Download PDFInfo
- Publication number
- CN113608085A CN113608085A CN202111061114.3A CN202111061114A CN113608085A CN 113608085 A CN113608085 A CN 113608085A CN 202111061114 A CN202111061114 A CN 202111061114A CN 113608085 A CN113608085 A CN 113608085A
- Authority
- CN
- China
- Prior art keywords
- insulator
- voltage
- charge
- test
- guide rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01R31/1245—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 line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Testing Relating To Insulation (AREA)
Abstract
A device and a method for testing insulator charge and flashover under an electric heating composite field belong to the technical field of high-voltage equipment experiments. Insulator electric charge and flashover test device under electric heat composite field includes: the high-voltage testing device comprises a closed air chamber, an upper high-voltage guide rod, a lower high-voltage guide rod, a grounding shell, a charge measuring probe, a hollow electrode and a high-voltage power supply, wherein the upper high-voltage guide rod is connected with the inner side of the top of the closed air chamber, the lower high-voltage guide rod is connected with a testing insulator, the grounding shell is arranged on the outer side of the lower high-voltage guide rod, the charge measuring probe is arranged above the side face of the testing insulator, the hollow electrode is connected with the outer side of the top of the closed air chamber, the positive pole of the high-voltage power supply is connected with the hollow electrode, and the grounding electrode is grounded. The insulator charge and flashover test device and method under the electric heating composite field can simulate charge and flashover tests of the high-voltage guide rod at different temperatures, can realize simultaneous heating and pressurization, and can heat the inside of the closed air chamber from the outside, thereby improving the accuracy of test results.
Description
Technical Field
The invention relates to the technical field of high-voltage equipment experiments, in particular to a device and a method for testing insulator charge and flashover under an electric heating composite field.
Background
Direct current GIS (gas insulated switchgear) is one of the key technical problems affecting the large number of practical applications of direct current GIS, compared with alternating current GIS, the accumulation of surface charges of a basin-type insulator has been one of the major technical problems. Under the action of direct current, the surface charges of the basin-type insulator in the GIS are accumulated seriously, and the accumulated charges can distort the original electric field distribution of the insulator along the surface, so that the insulating property of the insulator is seriously reduced, and the insulating fault is caused. Therefore, we must experimentally investigate the accumulation of charge.
Under different loads, the current-carrying heating of the GIS center guide rod which normally runs causes the temperature of gas and insulators to be non-uniformly distributed, and a temperature difference of about 30 ℃ is formed between the guide rod and the shell and is increased along with the increase of current. Compared with the dielectric constant, the insulator conductance changes along with the temperature of the bus, so that the direct current field distribution is obviously influenced by the temperature field, the charge distribution characteristic under the temperature gradient field is different from that of a uniform temperature field, the local charge density is increased along with the temperature rise of the central current-carrying conductor, the severe distortion of the electric field is caused along with the increase of the transmission capacity and the increase of the direct current voltage grade, and the equipment is subjected to the common influence of high temperature difference caused by high load current and severe charge accumulation under the high field on the direct current field distribution. When a temperature gradient exists between the direct-current GIS high-voltage guide rod and the shell, the position of the maximum electric field intensity of the insulator edge surface moves to the side with lower temperature, and the higher the temperature is, the lower the flashover voltage of the insulator edge surface is. The non-uniform change of the body conductivity caused by the temperature gradient of the direct-current GIL insulator can cause space charge accumulation to further cause electric field distortion, and the surface charge accumulation is obviously influenced.
At present, GIS insulator heating compound field charge and flashover platform exist the weak point, and some heating compound field charge and flashover platform are through heating the high-pressure guide arm inside the cavity, though can realize the adjustable and simulation operating condition of temperature of insulator like this, but set up heating device in inside and can cause the gas tightness of device to obtain guaranteeing, produce certain influence to the experimental result. Some experimental researches on electric charge under a temperature gradient field are carried out by heating in a heating sheet mode, the mode has the defects of uneven heating and slow heating, and can damage a sample in severe cases, and the mode can also influence the electric charge distribution on the surface of the insulator.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a device and a method for testing the charge and flashover of an insulator under an electric-heating composite field, which can simulate the charge and flashover test of a high-voltage guide rod at different temperatures, can realize simultaneous heating and pressurization, and can heat the inside of a closed air chamber from the outside, thereby improving the accuracy of test results.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides an insulator electric charge and flashover test device under electric heat composite field, includes:
a closed air chamber provided with a window;
an upper pressure guide bar connected to an inside of a top of the closed air chamber;
the top of the lower high-voltage guide rod is connected with the test insulator, and the bottom of the lower high-voltage guide rod is connected with the rotary lifting mechanism;
the grounding shell is arranged on the outer side of the lower high-voltage guide rod, and the bottom of the grounding shell is connected with the lifting mechanism;
the charge measuring probe is arranged above the side surface of the test insulator and is respectively connected with the potentiometer and the telescopic rotating mechanism;
a hollow electrode connected to the outside of the top of the closed air chamber and communicating with an oil reservoir; and
and the anode of the high-voltage power supply is connected with the hollow electrode, and the grounding electrode of the high-voltage power supply is grounded.
Further, be provided with heating device, temperature sensor and oil pump in the batch oil tank, heating device and temperature sensor all are connected with temperature regulating device, temperature sensor detects the temperature of the interior oil of batch oil tank and sends temperature regulating device, and temperature regulating device heats according to the threshold value of setting for, control heating device.
Furthermore, the hollow electrode is provided with an oil inlet and an oil outlet, the oil inlet is connected with an outflow pipe of the oil storage tank, and the oil outlet is connected with an inflow pipe of the oil storage tank.
Furthermore, the top end of the hollow electrode and one end of the upper high-voltage guide rod opposite to the lower high-voltage guide rod are provided with a pressure equalizing cover.
Furthermore, flexible rotary mechanism and charge measurement probe's outer wall connection, flexible rotary mechanism is including the ball screw structure that drives charge measurement probe and remove about and the bevel gear set mechanism that drives charge measurement probe rotatory.
Furthermore, the rotary lifting mechanism, the lifting mechanism and the telescopic rotating mechanism are all arranged outside the closed air chamber, and the joints of the rotary lifting mechanism, the lifting mechanism and the telescopic rotating mechanism and the closed air chamber are all arranged in a sealing mode.
Furthermore, the closed air chamber comprises a cylindrical barrel with an upper opening and a lower opening, a lower end cover arranged below the cylindrical barrel in a sealing mode and a basin-type insulator arranged above the cylindrical barrel in a sealing mode.
Furthermore, the bottom of the lower high-voltage guide rod is connected with the rotary lifting mechanism through an insulating material, and the grounding shell and the lower high-voltage guide rod are both grounded.
Further, the method for testing the charge of the insulator under the electric heating composite field by adopting the device for testing the charge and the flashover of the insulator under the electric heating composite field comprises the following steps:
s1, fixing the test insulator on a voltage-sharing cover at the top of the lower high-voltage guide rod, and then connecting the basin-type insulator with the sealed air chamber with the top of the cylindrical barrel in a sealing manner; vacuumizing the closed air chamber, and filling insulating gas with set pressure into the closed air chamber;
s2, enabling the oil temperature in the oil storage tank to reach a set temperature through a temperature control device;
s3, rotating the charge measuring probe to a position parallel to the upper high-voltage guide rod through the telescopic rotating mechanism, and moving the charge measuring probe to the right; the test insulator is controlled to ascend through a rotary lifting mechanism, so that the top of the test insulator is contacted with a voltage-sharing cover at the lower end of the upper high-voltage guide rod; the grounding shell is driven to ascend through the lifting mechanism, so that the grounding shell is contacted with the periphery of the test insulator;
s4, starting an oil pump in the oil storage tank to heat the hollow electrode so as to heat the test insulator; turning on a high-voltage power supply, and applying voltages with set amplitude and set time to two ends of the tested insulator;
s5, after the set amplitude and the set time are reached, the high-voltage power supply is closed, and the oil pump is closed at the same time; the grounding shell is driven to move downwards by the lifting mechanism, and the testing insulator is driven to move downwards by rotating the lifting mechanism;
s6, moving the charge measuring probe to the left through the telescopic rotating mechanism, and rotating the charge measuring probe to a measuring position; the test insulator is driven to rotate by the rotary lifting mechanism; and the charge measuring probe measures the potential of the surface of the test insulator and sends the potential to the potentiometer, and the experiment is finished.
Further, the method for testing the insulator flashover under the electric heating composite field by adopting the device for testing the charge and the flashover of the insulator under the electric heating composite field comprises the following steps:
(1) fixing a test insulator on a voltage-sharing cover at the top of the lower high-voltage guide rod, and then hermetically connecting a basin-type insulator of a closed air chamber with the top of the cylindrical barrel; vacuumizing the closed air chamber, and filling insulating gas with set pressure into the closed air chamber;
(2) the temperature of the oil in the oil storage tank reaches a set temperature through a temperature control device;
(3) the charge measuring probe is rotated to a position parallel to the upper high-voltage guide rod through the telescopic rotating mechanism and is moved rightwards; the test insulator is controlled to ascend through a rotary lifting mechanism, so that the top of the test insulator is contacted with a voltage-sharing cover at the lower end of the upper high-voltage guide rod; the grounding shell is driven to ascend through the lifting mechanism, so that the grounding shell is contacted with the periphery of the test insulator;
(4) starting an oil pump in the oil storage tank to heat the hollow electrode so as to heat the test insulator; turning on a high-voltage power supply, and applying voltage to two ends of the test insulator to enable the test insulator to flashover;
(5) after the insulator flashover is tested, the high-voltage power supply is turned off, and the oil pump is turned off at the same time; the grounding shell is driven to move downwards by the lifting mechanism, and the testing insulator is driven to move downwards by rotating the lifting mechanism;
(6) the charge measuring probe is moved leftwards through the telescopic rotating mechanism and rotated to a measuring position; the test insulator is driven to rotate by the rotary lifting mechanism; and the charge measuring probe measures the potential of the surface of the test insulator and sends the potential to the potentiometer, and the experiment is finished.
The invention has the beneficial effects that:
1) the gas closed chamber of the invention is small, the use of gas can be reduced, the cost is saved, the air pressure in the closed chamber can be adjusted in a certain range,and the composition of the gas in the closed gas chamber can be adjusted, for example, in sulfur hexafluoride (SF)6) Nitrogen (N)2) And carrying out flashover experiments in an environment-friendly gas environment;
2) the experimental device can be applied to various voltage conditions such as alternating voltage, direct voltage, impulse voltage and the like, and can simulate the condition of temperature gradient generated by electrifying the electrode under the actual working condition;
3) the invention can simulate the heating condition under the actual working condition by adopting an external heating device, the heating liquid is insulating oil by oil bath heating, the insulation is kept in the heating process, the heating device is protected from being damaged, the hollow electrode of the device is heated by the circulation of the oil, the temperature on the high-voltage guide rod is accurately controlled by the oil bath heating mode, different temperature gradient working conditions where the test insulator is positioned are simulated by the heat transfer of the guide rod, and the air tightness of the experimental device can be ensured by adopting the external heating method; the hose is selected as the fluid inlet and outlet pipe of the external heating device, the problem of difficult oil inlet under high air pressure is not needed to be considered, and meanwhile, the hose and the oil are made of insulating materials, so that the condition of high-voltage electrification is avoided, and a reliable experimental platform is provided for the deep research of the surface charge accumulation phenomenon and the surface flashover phenomenon of the insulator;
4) the heating device, the rotary lifting mechanism, the lifting mechanism and the telescopic rotating mechanism are all arranged outside the closed air chamber, and compared with the built-in heating device, the air tightness of the device is not influenced, and the influence of the operating mechanism and the heating system on experimental results is reduced.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
Fig. 1 is a schematic structural diagram of an insulator charge and flashover test apparatus under an electrothermal composite field according to an embodiment of the present invention;
FIG. 2 is a schematic view of an enclosed plenum upon pressurization provided by an embodiment of the present invention;
FIG. 3 is a diagram of the movement of the position of the components within the closed gas cell after a flashover as provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a telescopic rotating mechanism according to an embodiment of the present invention.
Reference numerals in the drawings of the specification include:
1-closed air chamber, 2-window, 3-upper high-voltage guide rod, 4-lower high-voltage guide rod, 5-testing insulator, 6-rotary lifting mechanism, 7-grounded shell, 8-lifting mechanism, 9-charge measuring probe, 10-potentiometer, 11-telescopic rotating mechanism, 12-hollow electrode, 13-oil storage tank, 14-high-voltage power supply, 15-heating device, 16-temperature sensor, 17-oil pump, 18-temperature control device, 19-oil inlet, 20-oil outlet, 21-pressure equalizing cover, 22-protective resistor, 23-basin insulator, 24-first stepping motor, 25-coupler, 26-ball screw, 27-linkage plate, 28-first linear optical axis, 29-second linear optical axis, 30-side end cover dynamic seal shell, 31-bevel gear set additional plate, 32-step motor II, 33-square flange linear bearing, 34-probe supporting rod, 35-bevel gear set, 36-motor positioning plate, 37-optical axis fixing seat, 38-lead screw supporting seat and 39-insulating material.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a" and "an" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In order to solve the problems in the prior art, as shown in fig. 1 to 4, the invention provides an insulator charge and flashover test device under an electrothermal composite field, which comprises:
a closed air chamber 1 provided with a window 2;
an upper high pressure guide rod 3 connected with the inner side of the top of the closed air chamber 1;
the top of the lower high-voltage guide rod 4 is connected with a test insulator 5, and the bottom of the lower high-voltage guide rod is connected with a rotary lifting mechanism 6;
the grounding shell 7 is arranged on the outer side of the lower high-voltage guide rod 4, and the bottom of the grounding shell 7 is connected with the lifting mechanism 8;
the charge measuring probe 9 is arranged above the side surface of the testing insulator 5, and the charge measuring probe 9 is respectively connected with the potentiometer 10 and the telescopic rotating mechanism 11;
a hollow electrode 12 connected to the top outside of the closed gas chamber 1, the hollow electrode 12 communicating with the oil reservoir 13; and
the high voltage power supply 14 has its positive electrode connected to the hollow electrode 12 and its ground electrode grounded.
As shown in fig. 1, a heating device 15, a temperature sensor 16 and an oil pump 17 are arranged in the oil storage tank 13, the heating device 15 and the temperature sensor 16 are both connected with a temperature control device 18, the temperature sensor 16 detects the temperature of the oil in the oil storage tank 13 and sends the temperature control device 18, the temperature control device 18 controls the heating device 15 to heat according to a set threshold value, and the personal safety of personnel in the experimental process is ensured by remotely controlling the temperature. In actual use, when the temperature sensor 16 detects that the temperature of the oil in the oil storage tank 13 is lower than a set threshold value, the temperature control device 18 controls the heating device 15 to heat until the temperature is equal to the set threshold value, and high-temperature oil is input into the hollow electrode 12 through the oil pump 17; the thermostat 18 can issue an alarm when the temperature sensor 16 detects that the temperature of the oil in the oil reservoir 13 exceeds a set threshold. In this embodiment, the heating device 15 is a resistance wire, which is an important part for ensuring the working of the experimental platform; the temperature sensor 16 is a thermocouple, which is made of metal oxide ceramic, and is the temperature sensor 16 with low cost and highest sensitivity, and the temperature measuring range is-50 to 200 degrees, which has the advantages of small volume, fast response time, and the like, and of course, other temperature sensors 16 can be selected according to actual situations, such as: thermistors, Resistance Temperature Detectors (RTDs), and IC temperature sensors 16, the IC temperature sensors 16 including both analog and digital types of outputs.
As shown in fig. 1 to 3, the hollow electrode 12 is provided with an oil inlet 19 and an oil outlet 20, the oil inlet 19 is connected to an outflow pipe of the oil reservoir 13, and the oil outlet 20 is connected to an inflow pipe of the oil reservoir 13. In the embodiment, an oil inlet 19 and an oil outlet 20 are welded on the hollow electrode 12, the oil inlet 19 is positioned below, the oil outlet 20 is positioned above, high-temperature insulating oil flows in from below and flows out from above, and the joint is sealed by sealant to ensure that no liquid leakage occurs and scald is avoided; the high-temperature oil in the oil storage tank 13 enters the hollow electrode 12 through the outflow pipe and the oil inlet 19, then returns to the oil storage tank 13 through the oil outlet 20 and the inflow pipe, the oil storage tank 13 is made of Polycarbonate (PC) plastic, so that the oil storage tank 13 is convenient to carry, easy to process and resistant to high temperature, the working temperature is 20-100 ℃, the outflow pipe and the inflow pipe are made of insulating hoses made of silicon rubber and the like, and the high-temperature oil can bear the temperature of minus 60 ℃ to plus 200 ℃.
As shown in fig. 1 to 3, the top end of the hollow electrode 12 and the opposite ends of the upper high-voltage guide rod 3 and the lower high-voltage guide rod 4 are provided with voltage-equalizing covers 21 for equalizing the electric field, and the voltage-equalizing covers 21 are made of aluminum, so that the voltage can be uniformly distributed on the insulator 5 to be tested, and the purpose of simulating the actual working condition is achieved.
As shown in fig. 1 to 3, a protective resistor 22 is provided on a connection line between the high-voltage power supply 14 and the hollow electrode 12. In this embodiment, the hollow electrode 12 is a hollow metal tube, two ends of the hollow metal tube are externally threaded, the upper end of the hollow electrode 12 is connected with the voltage-equalizing cover 21, and the lower end of the hollow electrode 12 is connected with the basin-type insulator 23.
As shown in fig. 1 and 4, the telescopic rotating mechanism 11 is connected to the outer wall of the charge measurement probe 9, and the telescopic rotating mechanism 11 includes a ball screw 26 structure for driving the charge measurement probe 9 to move left and right and a bevel gear set mechanism for driving the charge measurement probe 9 to rotate. In the embodiment, the ball screw 26 structure comprises a first stepping motor 24, a ball screw 26 connected with the first stepping motor 24 through a coupler 25, a linkage plate 27 sleeved outside the ball screw 26, and a first linear optical axis 28 slidably connected with the linkage plate 27, wherein a second linear optical axis 29 is fixedly connected to one side of the linkage plate 27 away from the first stepping motor 24, the second linear optical axis 29 penetrates through a side end cover movable sealing shell 30 to be connected with an additional plate 31 of the bevel gear set, the first stepping motor 24 drives the ball screw 26 to rotate, the ball screw 26 drives the linkage plate 27 to move along the first linear optical axis 28, and the linkage plate 27 drives a charge measurement probe 9 connected with the additional plate 31 of the bevel gear set to move left and right through the second linear optical axis 29; the bevel gear group mechanism comprises a second stepping motor 32, the second stepping motor 32 is fixed on the linkage plate 27, the output end of the second stepping motor 32 is connected with a probe support rod 34 through a square flange linear bearing 33 on the linkage plate 27, the probe support rod 34 penetrates through the side end cover movable sealing shell 30 and is connected with a bevel gear group 35 arranged on the bevel gear group additional plate 31 through a coupler 25, the bevel gear group 35 is connected with the charge measurement probe 9, the second stepping motor 32 rotates to drive the bevel gear group 35 to rotate through the probe support rod 34, and the bevel gear group 35 drives the charge measurement probe 9 to rotate; the first stepping motor 24 is fixed on the bottom plate through a motor positioning plate 36, the first linear optical axis 28 is fixed on the bottom plate through an optical axis fixing seat 37, the ball screw 26 is rotatably arranged on the bottom plate through a screw support seat 38, and the charge measuring probe 9 adopts a Kelvin probe; the telescopic rotating mechanism 11 is connected with the side wall of the closed air chamber 1 through a flange, and the side end cover moves the sealing shell 30 to ensure the sealing of the linear optical axis II 29 and the probe supporting rod 34 during movement.
In the invention, a rotary lifting mechanism 6, a lifting mechanism 8 and a telescopic rotating mechanism 11 are all arranged outside a closed air chamber 1, the joints of the rotary lifting mechanism 6, the lifting mechanism 8 and the telescopic rotating mechanism 11 with the closed air chamber 1 are all sealed, for example, dynamic sealing is adopted, in the embodiment, the top end of the rotary lifting mechanism 6 extends into the closed air chamber 1 and is connected with a lower high-voltage guide rod 4 and a voltage-sharing cover 21 through an insulating material 39, the rotary lifting mechanism 6 adopts the prior art and is used for driving the lifting and the rotation of the lower high-voltage guide rod 4 so as to drive the lifting and the rotation of a test insulator 5, wherein when the test insulator 5 is driven to ascend, the test insulator 5 is in contact with the voltage-sharing cover 21 at the lower end of the upper high-voltage guide rod 3, and flashover is realized; when the test insulator 5 is driven to rotate, the charge measuring probe 9 is facilitated to measure the potential of the surface of the test insulator 5; when the rotary lifting mechanism 6 is actually selected for use, a structure capable of driving the high-pressure guide rod 4 to lift and rotate is selected according to needs. The lifting mechanism 8 adopts the prior art, drives the grounding shell 7 to ascend, and when the test insulator 5 is contacted with the pressure equalizing cover 21 at the lower end of the upper high-voltage guide rod 3, the grounding shell 7 ascends to be contacted with the periphery of the test insulator 5 so as to finish a flashover experiment; when the lifting mechanism 8 is actually selected, a structure capable of driving the grounding shell 7 to lift can be selected according to needs.
In the invention, the closed air chamber 1 comprises a cylindrical barrel with an upper opening and a lower opening, a lower end cover arranged below the cylindrical barrel in a sealing way and a basin-type insulator 23 arranged above the cylindrical barrel in a sealing way. In the embodiment, 4 windows 2 are uniformly arranged on the cylindrical barrel, the lower end cover always keeps a sealing connection state with the cylindrical barrel, the basin-type insulator 23 is in sealing connection with the cylindrical barrel, the top of the basin-type insulator 23 is in threaded connection with the lower end of the hollow electrode 12, the bottom of the basin-type insulator 23 is in threaded connection with the top of the upper high-pressure guide rod 3, all interfaces on the closed air chamber 1 ensure air tightness, and the closed air chamber 1 can bear the air pressure of-0.1 to +0.5 Mpa; the closed air chamber 1 is provided with an air inlet for vacuumizing the closed air chamber 1 and inputting high-pressure air into the closed air chamber 1.
In the invention, the bottom of the lower high-voltage guide rod 4 is connected with the rotary lifting mechanism 6 through the insulating material 39, and the grounding shell 7 and the lower high-voltage guide rod 4 are both grounded, in the embodiment, the grounding shell 7 is of a cylindrical structure and made of acrylic, so that the lifting mechanism 8 is light in weight, the lifting control is convenient, and the grounding shell 7 at the low-voltage end of the insulator is simulated. The upper high-voltage guide rod 3 and the lower high-voltage guide rod 4 are both metal tubes, and two ends of the metal tubes are externally threaded, the upper end of the upper high-voltage guide rod 3 is connected with a basin-type insulator 23, and the lower end of the upper high-voltage guide rod 3 is connected with a voltage-sharing cover 21; the upper end of the lower high-voltage guide rod 4 is connected with a voltage-sharing cover 21, the voltage-sharing cover 21 is connected with the testing insulator 5, the lower end of the lower high-voltage guide rod 4 is connected with an insulating material 39, and the insulating material 39 is made of polytetrafluoroethylene and isolates and insulates the high-voltage electrode from the rotary lifting mechanism 6.
In practical use, the invention can adopt a PC to be connected with the temperature control device 18, the oil pump 17, the motors of the rotary lifting mechanism 6, the lifting mechanism 8 and the telescopic rotating mechanism 11 to realize automatic control, for example, the PC is used for realizing communication with the temperature control device 18, and the whole temperature control device 18 can be monitored and controlled when the distance is long.
As shown in fig. 1 to 4, the invention provides a method for testing the charge of an insulator in an electrothermal composite field, which adopts the device for testing the charge and flashover of the insulator in the electrothermal composite field, and comprises the following steps:
s1, fixing the testing insulator 5 on the pressure equalizing cover 21 at the top of the lower high-voltage guide rod 4, and then hermetically connecting the basin-type insulator 23 of the closed air chamber 1 with the top of the cylindrical barrel; vacuumizing the closed air chamber 1, and filling insulating gas with set pressure into the closed air chamber 1; specifically, the testing insulator 5 is fixed on a pressure equalizing cover 21 at the top of a lower high-voltage guide rod 4 which can rotate and lift in a closed air chamber 1, a basin-type insulator 23 is connected with the top of a cylindrical barrel in a sealing mode, then a hollow guide rod is connected with the top of the basin-type insulator 23, the air tightness in the air chamber 1 is sealed, after the closed air chamber 1 is vacuumized, air with the pressure of 0.1-0.4 Mpa is filled into the closed air chamber 1 through an air inlet of the closed air chamber 1, and an air valve is closed.
S2, enabling the oil temperature in the oil storage tank 13 to reach the set temperature through the temperature control device 18; specifically, after the insulating gas is filled into the closed cavity to reach the required pressure, the temperature of the oil in the oil storage tank 13 is adjusted through the temperature control device 18, the heating device 15 and the temperature sensor 16 in the oil storage tank 13, so that the temperature in the oil storage tank 13 is 20-100 ℃, the temperature of the oil in the oil storage tank 13 is guaranteed to be maintained at the temperature required by the experiment, and the measurement of the gas-solid surface potential is realized.
S3, as shown in fig. 2, the charge measurement probe 9 is rotated to a position parallel to the upper high voltage guide bar 3 by the telescopic rotation mechanism 11, and the charge measurement probe 9 is moved rightward; the test insulator 5 is controlled to ascend through the rotary lifting mechanism 6, so that the top of the test insulator 5 is contacted with the pressure equalizing cover 21 at the lower end of the upper high-voltage guide rod 3; the grounding shell 7 is driven to ascend through the lifting mechanism 8, so that the grounding shell 7 is in contact with the periphery of the test insulator 5, and the good contact between the outside of the test insulator 5 and a grounded low-voltage electrode is ensured.
S4, starting an oil pump 17 in the oil storage tank 13 to heat the hollow electrode 12 so as to heat the test insulator 5; turning on the high-voltage power supply 14, and applying voltages with set amplitude and set time to the two ends of the test insulator 5; specifically, after the heated high-temperature oil in the oil storage tank 13 is continuously input into the hollow electrode 12 to heat the high-voltage guide rod, and the temperature of the insulator 5 to be tested is stable, for example, after the high-temperature oil is input into the hollow electrode 12 for 5 to 10 minutes, the high-voltage power supply 14 is turned on, and a step-by-step boosting method is adopted to apply voltage to two ends of the test.
S5, as shown in fig. 3, after the set amplitude and the set time are reached, turning off the high voltage power supply 14 and simultaneously turning off the oil pump 17; the grounding shell 7 is driven to move downwards by the lifting mechanism 8, and the testing insulator 5 is driven to move downwards by the rotating lifting mechanism 6; specifically, after the set amplitude and the set time are reached, the voltages at two ends of the test insulator 5 are immediately made to be zero, the hollow electrode 12 is separated from the basin-type insulator 23, the lifting mechanism 8 drives the grounding shell 7 to move downwards, the rotary lifting mechanism 6 drives the test insulator 5 to move downwards, the test insulator 5 is separated from the high-low voltage electrodes, charge dissipation in the measurement time is reduced, meanwhile, the oil pump 17 is closed, the heating cycle is stopped, and rapid charge dissipation caused by high temperature is reduced; at this time, the heating device 15 and the temperature control device 18 are also in the off state.
S6, moving the charge measurement probe 9 to the left by the telescopic rotating mechanism 11, and rotating the charge measurement probe 9 to the measurement position; the test insulator 5 is driven to rotate by the rotary lifting mechanism 6; the charge measuring probe 9 measures the potential of the surface of the test insulator 5 and sends the potential to the potentiometer 10, and the experiment is finished; specifically, the potential of the surface of the insulator is measured by a Kelvin probe, the potential of the surface of the tested insulator 5 is measured by the potentiometer 10, and the charge distribution of the surface of the tested insulator 5 is calculated by an inversion algorithm; after the experiment, the test insulator 5 was taken out, wiped with absolute ethanol, left for 1 to 2 days, and the next experiment was performed by repeating S1 to S6.
As shown in fig. 1 to 4, the invention provides a flashover test method for an insulator under an electric-thermal composite field, which adopts the electric charge and flashover test device for the insulator under the electric-thermal composite field, and comprises the following steps:
(1) fixing the test insulator 5 on a pressure equalizing cover 21 at the top of the lower high-voltage guide rod 4, and then sealing and connecting a basin-type insulator 23 of the closed air chamber 1 with the top of the cylindrical barrel; vacuumizing the closed air chamber 1, and filling insulating gas with set pressure into the closed air chamber 1; specifically, the testing insulator 5 is fixed on a pressure equalizing cover 21 at the top of a lower high-voltage guide rod 4 which can rotate and lift in a closed air chamber 1, a basin-type insulator 23 is connected with the top of a cylindrical barrel in a sealing mode, then a hollow guide rod is connected with the top of the basin-type insulator 23, the air tightness in the air chamber 1 is sealed, after the closed air chamber 1 is vacuumized, air with the pressure of 0.1-0.4 Mpa is filled into the closed air chamber 1 through an air inlet of the closed air chamber 1, and an air valve is closed.
(2) The temperature of the oil in the oil storage tank 13 is enabled to reach the set temperature through the temperature control device 18; specifically, after the insulating gas is filled into the closed cavity to reach the required pressure, the temperature of the oil in the oil storage tank 13 is adjusted through the temperature control device 18, the heating device 15 and the temperature sensor 16 in the oil storage tank 13, so that the temperature in the oil storage tank 13 is 20-100 ℃, the temperature of the oil in the oil storage tank 13 is guaranteed to be maintained at the temperature required by the experiment, and the measurement of the gas-solid surface potential is realized.
(3) As shown in fig. 2, the charge measuring probe 9 is rotated to a position parallel to the upper high voltage guide bar 3 by the telescopic rotating mechanism 11, and the charge measuring probe 9 is moved rightward; the test insulator 5 is controlled to ascend through the rotary lifting mechanism 6, so that the top of the test insulator 5 is contacted with the pressure equalizing cover 21 at the lower end of the upper high-voltage guide rod 3; the grounding shell 7 is driven to ascend through the lifting mechanism 8, so that the grounding shell 7 is in contact with the periphery of the test insulator 5, and the good contact between the outside of the test insulator 5 and a grounded low-voltage electrode is ensured.
(4) Starting an oil pump 17 in the oil storage tank 13 to heat the hollow electrode 12 so as to heat the test insulator 5; turning on the high-voltage power supply 14, and applying voltage to two ends of the test insulator 5 to enable the test insulator 5 to flashover; specifically, after the heated high-temperature oil in the oil storage tank 13 is continuously input into the hollow electrode 12 to heat the high-voltage guide rod, and the temperature of the insulator 5 to be tested is stable, for example, after the high-temperature oil is input into the hollow electrode 12 for 5 to 10 minutes, the high-voltage power supply 14 is turned on, and a step-by-step boosting method is adopted to apply voltage to two ends of the test.
(5) As shown in fig. 3, after the insulator 5 is tested to flashover, the high-voltage power supply 14 is turned off, and the oil pump 17 is turned off; the grounding shell 7 is driven to move downwards by the lifting mechanism 8, and the testing insulator 5 is driven to move downwards by the rotating lifting mechanism 6; specifically, after the insulator 5 is tested to flashover, the voltages at two ends of the insulator 5 are immediately made to be zero, the hollow electrode 12 is separated from the basin-type insulator 23, the lifting mechanism 8 drives the grounding shell 7 to move downwards, the lifting mechanism 6 is rotated to drive the insulator 5 to move downwards, the insulator 5 is separated from the high-voltage and low-voltage electrodes, charge dissipation in the measurement time is reduced, meanwhile, the oil pump 17 is turned off to stop the heating cycle, and rapid charge dissipation caused by high temperature is reduced; at this time, the heating device 15 and the temperature control device 18 are also in the off state.
(6) The charge measuring probe 9 is moved to the left by the telescopic rotating mechanism 11, and the charge measuring probe 9 is rotated to a measuring position; the test insulator 5 is driven to rotate by the rotary lifting mechanism 6; the charge measuring probe 9 measures the potential of the surface of the test insulator 5 and sends the potential to the potentiometer 10, and the experiment is finished; specifically, the potential of the surface of the insulator is measured by a Kelvin probe, the potential of the surface of the tested insulator 5 is measured by the potentiometer 10, and the charge distribution of the surface of the tested insulator 5 is calculated by an inversion algorithm; after the experiment, the test insulator 5 was taken out, wiped with absolute ethanol, left for 1 to 2 days, and the next experiment was performed by repeating S1 to S6.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides an insulator electric charge and flashover test device under electric heat composite field which characterized in that includes:
a closed air chamber provided with a window;
an upper pressure guide bar connected to an inside of a top of the closed air chamber;
the top of the lower high-voltage guide rod is connected with the test insulator, and the bottom of the lower high-voltage guide rod is connected with the rotary lifting mechanism;
the grounding shell is arranged on the outer side of the lower high-voltage guide rod, and the bottom of the grounding shell is connected with the lifting mechanism;
the charge measuring probe is arranged above the side surface of the test insulator and is respectively connected with the potentiometer and the telescopic rotating mechanism;
a hollow electrode connected to the outside of the top of the closed air chamber and communicating with an oil reservoir; and
and the anode of the high-voltage power supply is connected with the hollow electrode, and the grounding electrode of the high-voltage power supply is grounded.
2. The device for testing the charge and flashover of the insulator under the electrothermal composite field according to claim 1, wherein a heating device, a temperature sensor and an oil pump are arranged in the oil storage tank, the heating device and the temperature sensor are both connected with a temperature control device, the temperature sensor detects the temperature of the oil in the oil storage tank and sends the temperature to the temperature control device, and the temperature control device controls the heating device to heat according to a set threshold value.
3. The electric heating composite field insulator charge and flashover test device according to claim 1, wherein the hollow electrode is provided with an oil inlet and an oil outlet, the oil inlet is connected with an outflow pipe of the oil storage tank, and the oil outlet is connected with an inflow pipe of the oil storage tank.
4. The apparatus of claim 1, wherein the top end of the hollow electrode and the opposite ends of the upper and lower high voltage guide rods are provided with voltage equalizing covers.
5. The device for testing insulator charge and flashover under the electrothermal composite field according to claim 1, wherein the telescopic rotating mechanism is connected with the outer wall of the charge measuring probe, and comprises a ball screw structure driving the charge measuring probe to move left and right and a bevel gear set mechanism driving the charge measuring probe to rotate.
6. The device for testing insulator charge and flashover under the electrothermal composite field according to claim 1, wherein the rotary lifting mechanism, the lifting mechanism and the telescopic rotating mechanism are all arranged outside the closed air chamber, and the joints of the rotary lifting mechanism, the lifting mechanism and the telescopic rotating mechanism and the closed air chamber are all arranged in a sealing manner.
7. The electric-thermal composite field insulator charge and flashover test device according to claim 1, wherein the closed air chamber comprises a cylindrical barrel with an upper opening and a lower opening, a lower end cover arranged below the cylindrical barrel in a sealing manner, and a basin-type insulator arranged above the cylindrical barrel in a sealing manner.
8. The electric-thermal composite field insulator charge and flashover test device according to claim 1, wherein the bottom of the lower high-voltage guide rod is connected with the rotary lifting mechanism through an insulating material, and the grounding shell and the lower high-voltage guide rod are both grounded.
9. An electric heating composite field insulator charge test method, which adopts the electric heating composite field insulator charge and flashover test device of any one of claims 1-8, and is characterized by comprising the following steps:
s1, fixing the test insulator on a voltage-sharing cover at the top of the lower high-voltage guide rod, and then connecting the basin-type insulator with the sealed air chamber with the top of the cylindrical barrel in a sealing manner; vacuumizing the closed air chamber, and filling insulating gas with set pressure into the closed air chamber;
s2, enabling the oil temperature in the oil storage tank to reach a set temperature through a temperature control device;
s3, rotating the charge measuring probe to a position parallel to the upper high-voltage guide rod through the telescopic rotating mechanism, and moving the charge measuring probe to the right; the test insulator is controlled to ascend through a rotary lifting mechanism, so that the top of the test insulator is contacted with a voltage-sharing cover at the lower end of the upper high-voltage guide rod; the grounding shell is driven to ascend through the lifting mechanism, so that the grounding shell is contacted with the periphery of the test insulator;
s4, starting an oil pump in the oil storage tank to heat the hollow electrode so as to heat the test insulator; turning on a high-voltage power supply, and applying voltages with set amplitude and set time to two ends of the tested insulator;
s5, after the set amplitude and the set time are reached, the high-voltage power supply is closed, and the oil pump is closed at the same time; the grounding shell is driven to move downwards by the lifting mechanism, and the testing insulator is driven to move downwards by rotating the lifting mechanism;
s6, moving the charge measuring probe to the left through the telescopic rotating mechanism, and rotating the charge measuring probe to a measuring position; the test insulator is driven to rotate by the rotary lifting mechanism; and the charge measuring probe measures the potential of the surface of the test insulator and sends the potential to the potentiometer, and the experiment is finished.
10. An insulator flashover test method under an electric heating composite field, which adopts the insulator charge and flashover test device under the electric heating composite field as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:
(1) fixing a test insulator on a voltage-sharing cover at the top of the lower high-voltage guide rod, and then hermetically connecting a basin-type insulator of a closed air chamber with the top of the cylindrical barrel; vacuumizing the closed air chamber, and filling insulating gas with set pressure into the closed air chamber;
(2) the temperature of the oil in the oil storage tank reaches a set temperature through a temperature control device;
(3) the charge measuring probe is rotated to a position parallel to the upper high-voltage guide rod through the telescopic rotating mechanism and is moved rightwards; the test insulator is controlled to ascend through a rotary lifting mechanism, so that the top of the test insulator is contacted with a voltage-sharing cover at the lower end of the upper high-voltage guide rod; the grounding shell is driven to ascend through the lifting mechanism, so that the grounding shell is contacted with the periphery of the test insulator;
(4) starting an oil pump in the oil storage tank to heat the hollow electrode so as to heat the test insulator; turning on a high-voltage power supply, and applying voltage to two ends of the test insulator to enable the test insulator to flashover;
(5) after the insulator flashover is tested, the high-voltage power supply is turned off, and the oil pump is turned off at the same time; the grounding shell is driven to move downwards by the lifting mechanism, and the testing insulator is driven to move downwards by rotating the lifting mechanism;
(6) the charge measuring probe is moved leftwards through the telescopic rotating mechanism and rotated to a measuring position; the test insulator is driven to rotate by the rotary lifting mechanism; and the charge measuring probe measures the potential of the surface of the test insulator and sends the potential to the potentiometer, and the experiment is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111061114.3A CN113608085A (en) | 2021-09-10 | 2021-09-10 | Device and method for testing insulator charge and flashover under electric heating composite field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111061114.3A CN113608085A (en) | 2021-09-10 | 2021-09-10 | Device and method for testing insulator charge and flashover under electric heating composite field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113608085A true CN113608085A (en) | 2021-11-05 |
Family
ID=78342901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111061114.3A Pending CN113608085A (en) | 2021-09-10 | 2021-09-10 | Device and method for testing insulator charge and flashover under electric heating composite field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113608085A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114035003A (en) * | 2021-11-18 | 2022-02-11 | 湖北师范大学 | Insulation test device for power electronic device |
| CN114690008A (en) * | 2022-05-31 | 2022-07-01 | 国网天津市电力公司电力科学研究院 | Device and method for observing discharge and surface flashover of GIS insulator induced by particles |
| CN117214638A (en) * | 2023-11-07 | 2023-12-12 | 中国长江电力股份有限公司 | GIL pipeline high voltage resistance performance test system |
-
2021
- 2021-09-10 CN CN202111061114.3A patent/CN113608085A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114035003A (en) * | 2021-11-18 | 2022-02-11 | 湖北师范大学 | Insulation test device for power electronic device |
| CN114690008A (en) * | 2022-05-31 | 2022-07-01 | 国网天津市电力公司电力科学研究院 | Device and method for observing discharge and surface flashover of GIS insulator induced by particles |
| CN117214638A (en) * | 2023-11-07 | 2023-12-12 | 中国长江电力股份有限公司 | GIL pipeline high voltage resistance performance test system |
| CN117214638B (en) * | 2023-11-07 | 2024-01-09 | 中国长江电力股份有限公司 | GIL pipeline high voltage resistance performance test system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113608085A (en) | Device and method for testing insulator charge and flashover under electric heating composite field | |
| CN108445309B (en) | Basin-type insulator surface charge measuring device and method under temperature gradient field | |
| CN108519545B (en) | High-voltage insulator surface flashover experimental device and method under extremely cold condition | |
| CN105785146B (en) | Can analog DC GIL internal temperature rises surface Charge measuring table | |
| CN104020380B (en) | Gas-solid surface accumulating charge experimental system for simulating and method in different temperatures and gas | |
| CN109239539B (en) | Device and experimental method for researching partial discharge characteristics of epoxy insulating material | |
| CN108490278B (en) | Miniaturized basin-type insulator surface charge three-dimensional measurement device and method | |
| CN103954847A (en) | Testing device for oiled paper compound insulation frequency domain dielectric spectrum and conductivity test | |
| CN108205084B (en) | Electrostatic probe control mechanism and method for measuring surface potential of complex insulation structure | |
| CN104820175B (en) | One kind research contains micro- water SF6The device and experimental method of gas-insulated characteristic | |
| CN112067485B (en) | Multifunctional current-carrying frictional wear experimental device and operation method thereof | |
| CN108732473B (en) | Miniaturized basin-type insulator surface charge distribution synchronous measurement device and method | |
| CN103969291B (en) | A kind of stable state calorimeter method hemispherical emissivity tester | |
| CN216285559U (en) | Insulator charge and flashover test device under electric heating composite field | |
| CN103336232B (en) | A kind of pick-up unit | |
| KR101979775B1 (en) | Freeze testing apparatus for ground using up and down motion type multiplex cell | |
| CN108957254B (en) | Device and method for testing surface flashover characteristics of insulator under electric heating composite field | |
| CN104777361A (en) | Soil resistivity measuring device capable of controlling temperature | |
| CN208314083U (en) | A kind of temperature gradient disc insulator surface charge measuring device off field | |
| CN103901276A (en) | Measurement device and method for detecting oilpaper conductivity in high-voltage DC electric field | |
| CN114690008A (en) | Device and method for observing discharge and surface flashover of GIS insulator induced by particles | |
| Chan | Dielectric constant of Ne near its liquid-vapor critical point | |
| CN214408556U (en) | Penetration tester | |
| CN105865977B (en) | Device and method that are a kind of while measuring rheology parameter and electricity parameter | |
| CN105116225A (en) | Full-automatic excised skin percutaneous resistance measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |