CN109061329B - Analog measurement device and method for surface potential of insulator in GIL - Google Patents
Analog measurement device and method for surface potential of insulator in GIL Download PDFInfo
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- CN109061329B CN109061329B CN201810646534.XA CN201810646534A CN109061329B CN 109061329 B CN109061329 B CN 109061329B CN 201810646534 A CN201810646534 A CN 201810646534A CN 109061329 B CN109061329 B CN 109061329B
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Abstract
The invention discloses a device and a method for analog measurement of surface potential of an insulator in GIL, comprising the following steps: the device comprises a closed cavity, an insulator, an electrostatic probe and a high-voltage electrode guide rod; the wall surface of the closed cavity is provided with an air inlet and an air outlet; a guide rail is arranged in the closed cavity, a first shielding cylinder and an insulator are arranged at one end of the guide rail, the insulator is rotatably arranged in the first shielding cylinder through a high-voltage electrode support rod, a second shielding cylinder is arranged at the other end of the guide rail, and a high-voltage electrode guide rod is arranged in the second shielding cylinder; the first shielding cylinder and the second shielding cylinder are both grounded; the electrostatic probe is movably arranged in the closed cavity and can measure the surface potential of the insulator. The simulation measuring device can complete the simulation measurement of the surface potential of the insulator in the high-pressure closed cavity, can simulate the actual working environment of the GIL insulator more truly, has higher reliability of the measuring result, and can provide theoretical guidance for actual production.
Description
Technical Field
The invention belongs to the technical field of research on the surface electrification phenomenon of an insulating material of power equipment, and particularly relates to a device and a method for analog measurement of surface potential of an insulator in GIL.
Background
The gas insulated metal enclosed transmission line (GIL) has the characteristics of large transmission capacity, small loss, high safety, environmental friendliness and the like, can replace the traditional overhead transmission line, and can be used for large-capacity and long-distance electric energy transmission. The charge accumulated on the surface of the insulator in the long-term operation of the direct-current GIL is a main cause of the decrease in the insulation strength, compared with the alternating-current GIL. Therefore, accurately measuring the charge accumulated on the surface of the insulator is of great significance to the design and optimization of the direct current GIL power transmission system.
In order to obtain the surface potential distribution of the insulator, many measurement methods have been developed and are used up to now, such as the Lichtenberg powder diagram method, the Pockels effect method, the electrostatic probe method, and the like. Among these existing methods, the Pockels effect method can achieve in-situ measurement of surface potential, but its application is complicated and is only suitable for some thin transparent materials; the remaining methods cause potential decay during measurement, typically by minimizing charge decay by shortening the time of the measurement process. The electrostatic probe method is widely applied to surface potential measurement of insulating materials of various shapes due to the advantages of strong adaptability, easy operation and the like. In practical application, the GIL insulator is in a sealed space with higher air pressure, simulation measurement needs to be carried out in a high-pressure sealed environment, so that the measurement result has higher credibility, and the existing test method and device can not meet the measurement requirement.
Disclosure of Invention
The present invention is directed to a device and a method for analog measurement of surface potential of insulator in GIL, so as to solve the above-mentioned problems. The simulation measuring device can complete the simulation measurement of the surface potential of the insulator in the high-pressure closed cavity, can simulate the actual working environment of the GIL insulator more truly, has higher reliability of the measuring result, and can provide theoretical guidance for actual production.
In order to achieve the purpose, the invention adopts the following technical scheme:
an analog measurement device for insulator surface potential in a GIL, comprising: the device comprises a closed cavity, an insulator, an electrostatic probe and a high-voltage electrode guide rod; the wall surface of the closed cavity is provided with an air inlet and outlet which is used for being communicated with an air distribution device; a guide rail is arranged in the sealed cavity, a first shielding cylinder and an insulator are arranged at one end of the guide rail, the insulator is rotatably arranged in the first shielding cylinder through a high-voltage electrode support rod, a second shielding cylinder is arranged at the other end of the guide rail, a high-voltage electrode guide rod is arranged in the second shielding cylinder, one end of the high-voltage electrode guide rod is led out of the sealed cavity and can be connected with a high-voltage power supply, the first shielding cylinder and the insulator can be close to the second shielding cylinder and the high-voltage electrode guide rod along the guide rail, one end of the high-voltage electrode support rod, which is provided with the insulator, can be connected with the high-voltage electrode guide rod; the first shielding cylinder and the second shielding cylinder are both grounded; the electrostatic probe is movably arranged in the closed cavity and can measure the surface potential of the insulator.
Further, the guide rail comprises a first guide rail and a second guide rail; the second guide rail is movably arranged at one end of the first guide rail, and the second shielding cylinder is fixedly arranged at the other end of the first guide rail; the first motor is movably arranged on the second guide rail, and the first shielding cylinder is fixedly arranged on the second guide rail; the output shaft of the first motor is fixedly connected with one end of the high-voltage electrode supporting rod, and the other end of the high-voltage electrode supporting rod is fixedly provided with an insulator.
Further, the second shielding cylinder comprises a fixed part and a movable part; the fixed part is fixedly arranged on the first guide rail, the movable part is movably arranged on the fixed part, and a reset mechanism is arranged between the movable part and the fixed part.
Further, the reset mechanism is a reset spring; one side of the fixed part, which is provided with the moving part, is fixedly provided with a sliding track, the moving part is movably arranged in the sliding track, the sliding track is provided with a spring baffle, and a reset spring is arranged between the moving part and the spring baffle.
Furthermore, a metal block is arranged on the insulator, and the first shielding cylinder is connected with the second shielding cylinder through the metal block on the insulator.
Further, the device also comprises a third motor; the third motor is installed on the first guide rail and can move along the first guide rail together with the second guide rail, the second guide rail is a lead screw guide rail, the first motor is installed on the lead screw guide rail, and an output shaft of the third motor is connected with the lead screw guide rail.
Further, the device also comprises a fourth motor; the fourth motor is installed on the second guide rail and can move along the second guide rail, an output shaft of the fourth motor is connected with the electrostatic probe through a transmission device, and the fourth motor can control the electrostatic probe to do linear motion along the inclined plane of the insulator.
Further, the insulator is in a round platform shape.
Furthermore, a high-voltage electrode guide rod leading-in port is arranged on the wall surface of the closed cavity, a high-voltage sleeve is connected with the high-voltage electrode guide rod leading-in port, a high-voltage electrode guide rod is arranged in the high-voltage sleeve, and epoxy resin glue is filled between the high-voltage sleeve and the high-voltage electrode guide rod.
A simulation measurement method for surface potential of an insulator in GIL specifically comprises the following steps:
step 1: the high-voltage electrode supporting rod provided with the insulator is connected with the high-voltage electrode guide rod, and the first shielding cylinder is connected with the second shielding cylinder through the insulator;
and step 3: after the voltage application is finished, the high-voltage electrode support rod is separated from the high-voltage electrode guide rod, and the first shielding cylinder, the insulator and the second shielding cylinder are separated from each other;
and 4, step 4: the electrostatic probe is close to and vertical to the surface of the truncated cone-shaped insulator;
and 5: and (4) the insulator rotates, and the electrostatic probe linearly moves along the surface of the insulator to finish the measurement of the surface potential of the insulator.
Compared with the prior art, the invention has the following beneficial effects:
according to the analog measurement device for the surface potential of the insulator in the GIL, the working environment of the insulator in the actual GIL can be simulated by adopting the closed cavity, different gases can be filled into the closed cavity through the air inlet and outlet, and the air pressure in the closed cavity can be adjusted; the first shielding cylinder and the second shielding cylinder which are used as ground electrodes through the guide rail can be connected through the insulator, the high-voltage electrode supporting rod which is used as a high electrode can be connected with the high-voltage electrode guide rod, the static probe which can move along with the insulator is arranged near the insulator in the closed cavity, and the surface potential of the insulator can be simulated and measured in a short time by adopting a static probe method; through insulator rotation and the movement of the electrostatic probe along the surface of the insulator, the three-dimensional measurement of the surface potential of the insulator in the closed cavity can be realized, the three-dimensional distribution of the surface potential of the insulator can be obtained, the actual working environment of the GIL insulator can be simulated really, the measurement result has higher reliability, and theoretical guidance can be provided for actual production.
Furthermore, the first guide rail is fixedly arranged at the bottom in the closed cavity, the second guide rail moves along the first guide rail, the first shielding cylinder is connected with the second shielding cylinder, the high-voltage electrode guide rod is connected with the high-voltage electrode support rod, the first motor rotates to drive the insulator to rotate, and three-dimensional full-automatic measurement of the surface potential of the insulator in the closed cavity can be realized.
Furthermore, the second shielding cylinder is provided with a fixed part and a movable part, a sliding track is arranged between the fixed part and the movable part, a return spring is installed on the sliding track, the impact of the first shielding cylinder on the second shielding movable part can be buffered through the return spring, and the reset of the movable part can be completed through the return spring.
Furthermore, the first guide rail and the second guide rail are both lead screw guide rails, the moving distance of the insulator along the guide rails can be accurately controlled by driving the lead screw guide rails through the stepping motor, and accurate measurement can be completed.
Furthermore, in the measurement, the electrostatic probe only needs to do linear motion, and the insulator only needs to do rotary motion, so that the three-dimensional measurement of the surface potential of the insulator can be realized. The measuring method greatly shortens the time, only needs 150s, and can greatly reduce the influence of charge decay on the measuring result. In addition, the rotational symmetry structure facilitates the development of the subsequent surface charge inversion algorithm.
Furthermore, the insulator is in a round table shape and comprises a plane and an inclined plane, and the inclined angle between the inclined plane and the plane is fixed, so that the fact that the electrostatic probe is perpendicular to the surface of the electrostatic probe in measurement is guaranteed conveniently. The accumulation of the surface charges depends on the surface electric field distribution of the insulator, and the distribution of the surface electric field of the truncated cone-shaped insulator comprises a normal electric field component and a tangential electric field component, which are similar to the surface electric field distribution of the actual basin-shaped insulator, so that the experimental result on the truncated cone-shaped insulator is the same as that of the actual basin-shaped insulator, the theoretical reference value is high, and the surface potential measurement is more convenient due to the truncated cone-shaped structure. The electrode structure is the same as that in the GIL, the simplified structure similar to that of the GIL basin-type insulator is adopted in the design of the insulator, on one hand, the electric field environment where the insulator is located can be guaranteed to be consistent with that of the basin-type insulator in the GIL, on the other hand, the design greatly simplifies the measurement steps, shortens the measurement time and reduces the influence of the surface charge attenuation process on the accuracy of the experimental result.
Furthermore, epoxy resin glue is filled in a gap between the high-voltage bushing and a high-voltage electrode guide rod arranged in the high-voltage bushing, the gap is filled to ensure the insulating property, and the safety, the reliability and the accuracy of the device are further improved.
The measuring method provided by the invention is based on the measuring device provided by the invention, can be used for simulating and measuring the surface potential of the insulator in the actual GIL, is high in measuring efficiency and reliable in measuring data, and can reflect the surface charge accumulation condition of the basin-type insulator in the actual GIL.
Drawings
The invention is described in further detail below with reference to the figures and specific examples.
FIG. 1 is a schematic diagram of the overall structure of an analog measurement apparatus for insulator surface potential in a GIL according to the present invention;
FIG. 2 is a schematic cross-sectional view of the sealed chamber of FIG. 1;
FIG. 3 is a schematic view of the kinematic coupling of the earth and high voltage poles;
fig. 4 is a schematic structural view of the insulator in fig. 2;
FIG. 5 is a graph of insulator surface potential measurements in an example embodiment of the test of the present invention;
FIG. 6 is a three-dimensional distribution of surface potential of an insulator in an example of testing of the present invention;
FIG. 7 is a schematic diagram of the three-dimensional distribution of the surface potential of the insulator in the test embodiment of the present invention;
in fig. 1 to 4, 1 an aviation plug; 2, a safety valve; 3, a pressure gauge; 5, an observation window; 6, a lead flange of the electrostatic probe; 7, an experiment platform; 8 a first motor; 9, a motor bracket; 10 insulating the coupling; 11 a first shielding cylinder; 12 high voltage electrode support rods; 13 an insulator; 14 epoxy resin glue; 15 a high voltage bushing; 16 a moving part; 17 a high voltage electrode guide rod; 18 a return spring; 19 a glide track; 20 a fixed part; 21 a first guide rail; 22 a first guide way baffle; 23 a second guide rail; 24 second support.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1 to 4, the analog measurement device for surface potential of insulator in GIL according to the present invention is used for fully automatic measurement of surface potential of scaled GIL insulator 13 under high pressure, and comprises: the device comprises a movable experiment platform 7, a closed cavity, an insulator 13, an electrostatic probe and a high-voltage electrode guide rod 17.
The airtight cavity is fixedly arranged on the movable experiment platform 7, the support of the experiment platform 7 is used for fixedly supporting the airtight cavity, the movable roller is arranged on the experiment platform 7 and used for moving the whole simulation test device, and the movable experiment platform 7 is arranged to facilitate the movement of the simulation test device. The movable experiment platform 7 is provided with an electric cabinet for supplying power to an internal mechanical device, is provided with an indicator light for indicating the state of internal mechanical motion, and can adopt a small plate vehicle as the movable experiment platform 7.
The wall surface of the closed cavity is provided with two air inlets, an air outlet and two safety valves 2. The gas inlet and outlet are used for communicating with a gas distribution device, for charging/discharging single or mixed gas, and for charging different kinds of gas, such as SF6，SF6/N2Mixed gas, CO2Gas, N2/CO2Mixed gas, G3Gases, etc.; when the two air inlets are used for air inlet, in order to ensure uniform mixing, the air with larger molecular weight is filled in first, and the two injected air are mixed for 24 hours to be considered to be uniformly mixed. The working pressure of the closed cavity is (-0.1 to 1) MPa, the highest working pressure can reach 1MPa, the closed cavity is made of metal materials and is grounded, and the maximum pressure bearing of the closed cavity is not lower than 2 MPa. The safety valve 2 is arranged on the wall surface of the closed cavity and is communicated with the inside of the closed cavity, and is used for ensuring that the air pressure in the cavity does not exceed the highest air pressure in an experiment; specifically, the safety valve 2 sets the upper limit of the air pressure when the air pressure in the closed cavity isWhen the pressure exceeds the set pressure of the safety valve 2, the redundant gas is discharged, and the pressure in the cavity is still kept at the set pressure of the safety valve 2.
Be provided with pressure test device in the airtight cavity, pressure test device is used for testing the real-time atmospheric pressure in the airtight cavity, and pressure test device includes manometer 3 and pressure sensor. The pressure gauge 3 is used for roughly observing the real-time air pressure in the closed cavity, the pressure sensor is used for accurately measuring the real-time air pressure in the closed cavity, holes formed in the wall surface of the closed cavity are sealed, and sealing rings are adopted for sealing.
One or more observation windows 5 are further arranged on the wall surface of the closed cavity and used for observing the movement of the closed cavity of the surface potential measuring device and optical signals in the discharging process, and the observation windows 5 are specifically four optical observation medium windows: the quartz glass is adopted, the diameter is 20mm, the thickness is 8mm, the highest pressure resistance is 2MPa, the quartz glass is used for observing and recording optical signals in the discharging process and collecting discharging information, four observation windows 5 are respectively arranged at different parts of the closed cavity, a medium window at the head of the closed cavity is opposite to an inclined plane of the insulator 13 and used for collecting optical signals in the discharging process, and the observation window 5 above the closed cavity is mainly used for observing mechanical movement inside the closed cavity.
The wall surface of the closed cavity is also provided with two electrostatic probe lead flanges 6 for leading the measuring end of the electrostatic probe into the closed cavity, and the leading-out end of the electrostatic probe is connected with a data display and recording device; specifically, in order to ensure that the electrostatic probe works well, the electrostatic probe lead flange 6 adopts a flange formed by seven copper needles penetrating through nylon, and each copper needle is respectively butted with each lead of the probe and is used for introducing the electrostatic probe into the closed cavity to measure the surface potential of the insulator 13. The wall surface of the closed cavity is also provided with two aviation plugs 1 for leading out motion control signal wires of each motor in the closed cavity; specifically, the aviation plug 1 adopts a 24-core circular plug, and leads of an internal mechanical motion part are led out of the cavity. And the nylon flange is provided with a high-voltage sleeve 15 for introducing the high-voltage electrode guide rod 17 into the closed cavity, and the highest external applied voltage of the high-voltage electrode guide rod 17 is 150 kV. The high-voltage bushing 15 adopts an umbrella skirt structure and is made of nylon materials, and in order to avoid air gap discharge inside the bushing, epoxy resin glue 14 is filled in a gap between the high-voltage bushing 15 and a high-voltage electrode guide rod 17 arranged in the high-voltage bushing for filling the air gap and ensuring the insulation performance.
The guide rail is installed in the closed cavity and comprises a first guide rail 21 and a second guide rail 23, the first guide rail 21 is a first lead screw guide rail or a sliding guide rail, the second guide rail 23 is a second lead screw guide rail, and a first guide rail baffle 22 is arranged on the first guide rail 21 and used for preventing the second guide rail 23 from being separated. The second motor is arranged on the inner wall of the closed cavity, and an output shaft of the second motor is connected with the first lead screw guide rail. The second guide rail 23 and the third motor are installed at one end of the first lead screw guide rail through the first support frame, and the second shielding cylinder is fixedly arranged at the other end of the first guide rail 21. The output shaft of third motor is connected with second lead screw guide rail, and first motor 8 is installed on second lead screw guide rail through second support frame 24. The second motor can drive the first lead screw guide rail to rotate, so that the second guide rail 23 and the third motor can move along the first lead screw guide rail; the third motor can drive the second lead screw guide rail to rotate, so that the first motor 8 can move along the second lead screw guide rail. The first motor 8 is mounted on the second support frame 24 through the motor bracket 9. An output shaft of the first motor 8 is fixedly connected with one end of a high-voltage electrode supporting rod 12 through an insulating coupler 10, an insulator 13 is fixedly arranged at the other end of the high-voltage electrode supporting rod 12, the insulator 13 is in a round table shape, and the first motor 8 can drive the insulator 13 to rotate through the high-voltage electrode supporting rod 12. According to the invention, by adopting a coaxial cylindrical electrode structure and arranging the high-voltage electrode in the shielding cylinder, slightly uneven electric field distribution of the actual GIL can be simulated as much as possible, and the accuracy of simulation measurement is enhanced. The insulator 13 is designed to be in a round table shape, so that the tangential component and the normal component of the inclined plane electric field can be ensured, the environment of the electric field in which the insulator is positioned in the actual GIL can be consistent, and the measuring accuracy can be further improved.
The second guide rail 23 is fixedly provided with a first shielding cylinder 11, the insulator 13 can be retracted into the first shielding cylinder 11 in a natural state, and the first motor 8 moves along the second lead screw guide rail, so that the insulator 13 can extend out of the first shielding cylinder 11.
A high-voltage electrode guide rod 17 is arranged in the second shielding cylinder, one end of the high-voltage electrode guide rod 17 is led out of the closed cavity through a nylon flange and a high-voltage bushing 15 and can be connected with a high-voltage power supply, the first shielding cylinder 11 and the insulator 13 can enable a guide rail to be close to the second shielding cylinder and the high-voltage electrode guide rod 17, and one end, provided with the insulator 13, of the high-voltage electrode support rod 12 can be connected with the high-voltage electrode guide rod 17. The second shielding cylinder comprises a fixed part 20 and a movable part 16; the fixed part 20 is fixedly mounted on the first guide rail 21, the movable part 16 is movably mounted on the fixed part 20, and a reset mechanism is arranged between the movable part 16 and the fixed part 20. The method specifically comprises the following steps: the reset mechanism is a reset spring 18; a sliding rail 19 is fixedly arranged on one side of the fixed part 20, which is provided with the moving part 16, the moving part 16 is movably arranged in the sliding rail 19, a spring baffle plate is arranged on the sliding rail 19, a return spring 18 is arranged between the moving part 16 and the spring baffle plate, and the return of the moving part 16 can be completed through the return spring 18.
The electrostatic probe is movably arranged in the closed cavity, the electrostatic probe can measure the surface potential of the insulator 13, the fourth motor is arranged on the second guide rail 23 and can move along the second guide rail 23, an output shaft of the fourth motor is connected with the electrostatic probe through a transmission device, and the fourth motor can control the electrostatic probe to do linear motion along the inclined surface of the insulator 13. The electrostatic probe is a Trek 3455ET type active electrostatic probe and is used for measuring the charges accumulated on the surface of the insulating material under different voltage forms.
The end of the high voltage electrode support rod 12 without the insulator 13, the first shielding cylinder 11 and the second shielding cylinder are all grounded. In order to ensure the isolation of the control signals from high voltage, all the control signals are converted into optical signals, transmitted by optical fibers and converted into electrical signals by the optical fibers to be connected with a computer, and the safety and the stability of an internal control module are ensured by the photoelectric isolation design; the stop signals of all the motors are determined by photoelectric switches, and the start of each motor is controlled by a computer.
The measuring device comprises a high-pressure experiment cavity and an insulating material surface potential measuring device. The high-pressure experiment cavity is a closed cavity which is used for providing a gas atmosphere and a pressure environment for experiments, the highest tolerable pressure is 2MPa, and in order to ensure the personal safety of experimenters, the high-pressure experiment cavity is provided with two safety valves 2, and the cavity is provided with an electrostatic probe lead flange 6, a control signal lead aviation plug 1, an optical signal measurement medium window, a high-pressure lead bushing, an air inlet and outlet and other parts which are all sealed by an o-shaped sealing ring; the surface potential measuring device is used for measuring the surface potential distribution of the insulator 13 after the pressurization is finished, a coaxial cylindrical electrode structure and a circular truncated cone-shaped insulator 13 are adopted for simulating the structure of the actual GIL, the fact that the measuring result can reflect the surface potential condition of the insulator in the actual GIL is ensured, the surface potential is measured by means of the close fit of the rotation motion of the insulator 13 and the linear motion of the electrostatic probe, and the three-dimensional full-automatic measurement of the surface potential of the insulator 13 in the closed cavity of the insulator 13 can be achieved.
The working principle is as follows:
the simulation measuring device of the embodiment of the invention is an automatic measuring device for the surface potential of the scaled GIL basin-type insulator in the high-pressure closed cavity with the highest working pressure of 1 MPa. Through the cooperation of the four motors, the three-dimensional full-automatic measurement of the surface potential of the insulator 13 in the sealed cavity is realized by combining the linear motion of the electrostatic probe with the rotary motion of the insulator 13. The electrode structure is the same as that in the GIL, and the design of the insulator 13 adopts a simplified structure similar to that of the GIL basin-type insulator, so that on one hand, the electric field environment where the insulator 13 is located can be ensured to be consistent with that of the basin-type insulator in the actual GIL, on the other hand, the measurement steps can be simplified, the measurement time can be shortened, and the influence of the surface charge attenuation process on the accuracy of the experimental result can be reduced. In the measurement process, the charge accumulation condition of the inclined surface of the insulator 13 is focused, and because the inclined surface of the insulator 13 is in a slightly uneven electric field, the inclined electric field has both tangential component and normal component, which are consistent with the electric field distribution of the actual GIL basin-type insulator, and the surface charge accumulation is determined by the electric field distribution of the surface of the insulator 13, the experimental result on the small size can reflect the accumulation condition of the surface charge of the actual GIL insulator. The simulation measuring device can realize the measurement and recording of the surface potential of the insulating material under different gas atmospheres and different air pressures by adopting an electrostatic probe method, the designed electrode structure and the shape of the insulator 13 simulate the actual GIL, the simulation measuring result can accurately reflect the surface charge accumulation condition of the basin-shaped insulator in the actual GIL, and theoretical support and experimental guidance can be provided for the actual production.
The working process of the invention is as follows:
when high voltage is applied, the first shielding cylinder 11 and the high-voltage electrode support rod 12 move along the guide rail and are respectively connected with the second shielding cylinder and the high-voltage electrode guide rod 17, so that good contact between high electrodes and between ground electrodes is ensured. After the pressurization is finished, the first shielding cylinder 11 and the high-voltage electrode support rod 12 move along the guide rail and are separated from the second shielding cylinder and the high-voltage electrode guide rod 17 respectively; at this time, the electrostatic probe is moved to be close to the inclined surface of the insulator 13, is perpendicular to the surface of the insulator 13 and is 1mm away from the surface, the high voltage electrode support rod 12 of the movable portion 16 and the insulator 13 are driven by the rotating motor to rotate together, and the electrostatic probe moves linearly along the inclined surface of the insulator 13.
The device is mainly driven by four stepping motors to move. The high voltage electrode guide rod 17 and the shielding cylinder are respectively composed of a movable part 16 and a fixed part 20, wherein the movable part 16 can be driven by a motor. The specific working process is as follows: when high voltage is applied, the two stepping motors respectively drive the first shielding cylinder 11 and the high-voltage electrode supporting rod 12 to move to the second shielding cylinder, so that the high-voltage electrode guide rod 17 is tightly connected with the high voltage and the shielding cylinder and the ground, and at the moment, in order to ensure the safety of the electrostatic probe, the electrostatic probe is close to the first shielding cylinder 11; when the pressurization is finished and the surface potential needs to be measured, the stepping motor drives the high-voltage electrode support rod 12 of the movable part to be separated from the first shielding cylinder 11 and the second shielding cylinder, and simultaneously the insulator 13 is also separated from the first shielding cylinder 11, the electrostatic probe is driven by another stepping motor to move to the surface of the insulator 13, and the distance between the electrostatic probe and the surface of the insulator 13 is 1mm, which is the starting point to be measured. In the measuring process, the insulator 13 rotates for one circle, then the electrostatic probe steps by one step (about 1mm), and the electrostatic probe are matched to complete the potential measurement of the whole surface of the insulator 13.
A simulation measurement method for surface potential of an insulator in GIL specifically comprises the following steps:
step 1: the high-voltage electrode supporting rod 12 provided with the insulator 13 is connected with the high-voltage electrode guide rod 17, and the first shielding cylinder 11 is connected with the second shielding cylinder through the insulator 13;
and step 3: after the voltage application is finished, the high-voltage electrode support rod 12 is separated from the high-voltage electrode guide rod 17, and the first shielding cylinder 11, the insulator 13 and the second shielding cylinder are separated from each other;
and 4, step 4: the electrostatic probe is close to and vertical to the surface of the truncated cone-shaped insulator 13;
and 5: the insulator 13 rotates, and the electrostatic probe moves linearly along the surface of the insulator 13, so that the surface potential measurement of the insulator 13 is completed.
It will be appreciated by those skilled in the art that the foregoing is merely exemplary of the present invention and is not intended to limit the invention, which is defined by the appended claims and any changes, substitutions or alterations that fall within the true spirit and scope of the invention.
Claims (4)
1. An analog measurement device for insulator surface potential in a GIL, comprising: the device comprises a closed cavity, an insulator (13), an electrostatic probe and a high-voltage electrode guide rod (17);
the wall surface of the closed cavity is provided with an air inlet and outlet which is used for being communicated with an air distribution device;
a guide rail is arranged in the sealed cavity, a first shielding cylinder (11) and an insulator (13) are arranged at one end of the guide rail, the insulator (13) is rotatably arranged in the first shielding cylinder (11) through a high-voltage electrode support rod (12), a second shielding cylinder is arranged at the other end of the guide rail, a high-voltage electrode guide rod (17) is arranged in the second shielding cylinder, one end of the high-voltage electrode guide rod (17) is led out of the sealed cavity and can be connected with a high-voltage power supply, the first shielding cylinder (11) and the insulator (13) can be close to the second shielding cylinder and the high-voltage electrode guide rod (17) along the guide rail, one end of the high-voltage electrode support rod (12) provided with the insulator (13) can be connected with the high-voltage electrode guide rod (17), and the first shielding cylinder (11) can; the first shielding cylinder (11) and the second shielding cylinder are both grounded;
the electrostatic probe is movably arranged in the closed cavity and can measure the surface potential of the insulator (13);
the guide rail comprises a first guide rail (21) and a second guide rail (23); the second guide rail (23) is movably arranged at one end of the first guide rail (21), and the second shielding cylinder is fixedly arranged at the other end of the first guide rail (21); a first motor (8) is movably arranged on the second guide rail (23), and a first shielding cylinder (11) is fixedly arranged on the second guide rail (23); an output shaft of the first motor (8) is fixedly connected with one end of a high-voltage electrode supporting rod (12), and an insulator (13) is fixedly arranged at the other end of the high-voltage electrode supporting rod (12);
the second shielding cylinder comprises a fixed part (20) and a movable part (16); the fixed part (20) is fixedly arranged on the first guide rail (21), the moving part (16) is movably arranged on the fixed part (20), and a reset mechanism is arranged between the moving part (16) and the fixed part (20);
the reset mechanism is a reset spring (18); a sliding track (19) is fixedly arranged on one side, where the moving part (16) is installed, of the fixing part (20), the moving part (16) is movably arranged in the sliding track (19), a spring baffle plate is arranged on the sliding track (19), and a return spring (18) is arranged between the moving part (16) and the spring baffle plate;
a metal block is arranged on the insulator (13), and the first shielding cylinder (11) is connected with a moving part (16) of the second shielding cylinder through the metal block on the insulator (13);
the device also comprises a third motor; the third motor is arranged on the first guide rail (21) and can move along the first guide rail (21) together with the second guide rail (23), the second guide rail (23) is a lead screw guide rail, the first motor (8) is arranged on the lead screw guide rail, and an output shaft of the third motor is connected with the lead screw guide rail;
the device also comprises a fourth motor; the fourth motor is installed on the second guide rail (23) and can move along the second guide rail (23), an output shaft of the fourth motor is connected with the electrostatic probe through a transmission device, and the fourth motor can control the electrostatic probe to do linear motion along the inclined plane of the insulator (13).
2. A device for analog measurement of the surface potential of an insulator in a GIL according to claim 1, characterised in that the insulator (13) is truncated cone shaped.
3. The analog measurement device for the surface potential of the insulator in the GIL according to claim 1, wherein a high voltage electrode guide rod (17) inlet is arranged on the wall surface of the closed cavity, a high voltage bushing (15) is connected to the high voltage electrode guide rod (17) inlet, the high voltage electrode guide rod (17) is arranged in the high voltage bushing (15), and epoxy resin glue (14) is filled between the high voltage bushing (15) and the high voltage electrode guide rod (17).
4. A simulation measurement method for insulator surface potential in GIL is characterized in that based on the simulation measurement device of any one of claims 1 to 3, the simulation measurement method specifically comprises the following steps:
step 1: a high-voltage electrode support rod (12) provided with an insulator (13) is connected with a high-voltage electrode guide rod (17), and a first shielding cylinder (11) is connected with a second shielding cylinder through the insulator (13);
step 2, applying voltage through a high-voltage power supply;
and step 3: after the voltage application is finished, the high-voltage electrode support rod (12) is separated from the high-voltage electrode guide rod (17), and the first shielding cylinder (11), the insulator (13) and the second shielding cylinder are separated from each other;
and 4, step 4: the electrostatic probe is close to and vertical to the surface of the truncated cone-shaped insulator (13);
and 5: the insulator (13) rotates, and the electrostatic probe moves linearly along the surface of the insulator (13), so that the surface potential measurement of the insulator (13) is completed.
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| CN111413554B (en) * | 2019-01-04 | 2021-04-30 | 清华大学 | GIS/GIL insulator surface potential measuring device |
| CN110161323A (en) * | 2019-04-17 | 2019-08-23 | 天津大学 | Insulator surface potential measurement system and measurement method based on multisensor syste |
| CN110346658A (en) * | 2019-07-30 | 2019-10-18 | 合肥工业大学 | A kind of measuring device of material surface charge |
| CN110554288B (en) * | 2019-09-23 | 2021-02-02 | 华北电力大学 | Device for simulating metal particle adhesion behavior and discharge characteristic under GIL/GIS actual operation condition |
| CN111896605B (en) * | 2020-06-22 | 2022-01-21 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | GIL equipment three-support insulator surface charge measuring device and test method thereof |
| CN113567264B (en) * | 2021-08-24 | 2024-04-26 | 国家电网公司华中分部 | Experimental device and experimental method capable of simultaneously simulating high voltage and high temperature of GIL inner conductor |
| CN113721066B (en) * | 2021-09-10 | 2022-12-27 | 华北电力大学 | Conduction current measuring device and method |
| CN115453220A (en) * | 2022-09-20 | 2022-12-09 | 武汉大学 | Insulator surface potential full-coverage measuring device |
| 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 |
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| CN105785146B (en) * | 2016-03-23 | 2018-11-06 | 华北电力大学 | Can analog DC GIL internal temperature rises surface Charge measuring table |
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