CN112433129B - High-speed switch for simulating VFTO conduction miniature experiment device of GIS equipment - Google Patents
High-speed switch for simulating VFTO conduction miniature experiment device of GIS equipment Download PDFInfo
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- CN112433129B CN112433129B CN202011161693.4A CN202011161693A CN112433129B CN 112433129 B CN112433129 B CN 112433129B CN 202011161693 A CN202011161693 A CN 202011161693A CN 112433129 B CN112433129 B CN 112433129B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
- G01R19/0053—Noise discrimination; Analog sampling; Measuring transients
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/16—Construction of testing vessels; Electrodes therefor
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention belongs to the technical field of power system equipment, and discloses a high-speed switch for a VFTO conduction miniature experimental device for simulating GIS equipment. According to the invention, the wet reed pipe containing mercury inside is selected, so that the vibration of a switch reed in the process of quick switching is avoided, the main loop of the VFTO conduction micro-shrinkage experiment device for simulating GIS equipment is quickly opened and closed by utilizing the quick switching characteristic of the wet reed pipe, the pulse waveform with the gradient within tens of nanoseconds is generated, and the opening and closing of the contact inside the wet reed pipe are operated by means of the change of the relative distance between the permanent magnet and the wet reed pipe and the magnetic field. The pulse gradient generated by the switching operation accords with the pulse gradient range generated by insulation gas breakdown during the operation of the isolating switch of the true GIS equipment.
Description
Technical Field
The invention belongs to the technical field of power system equipment, and particularly relates to a high-speed switch for a VFTO conduction miniature experimental device for simulating GIS equipment.
Background
At present, in an electric power system, the problem of electromagnetic disturbance caused by higher and higher voltage level, capacity and density of an electric power network is more and more serious. In addition, more electronic and microcomputer control, measurement, communication and other equipment under the automation trend are applied to the power system, and the electromagnetic disturbance tolerance of the equipment is poor, so that the equipment is easily influenced by the outside. In many newly built large substations it is common practice to take protection and control equipment down to the switchyard, with the primary system providing ac and dc power to the secondary equipment via shielded cables. The space utilization rate is increased, the economic benefit is improved, but on the other hand, electronic equipment consisting of large-scale integrated circuits is sensitive to other electromagnetic interference source electrodes when working, so that misoperation, even equipment damage and other serious consequences are easy to occur, and the system cannot normally operate. Therefore, electromagnetic compatibility between devices is a problem that power system design and operators cannot ignore.
A Gas Insulated metal enclosed Switchgear (GIS for short) is a new type of substation that was developed and put into use in the sixties of the last century. Up to now, the GIS substation has received the approval of the power departments in all countries of the world, and its development is very rapid. Compared with the traditional AIS transformer substation, the GIS has the following advantages: (1) the occupied area and the occupied space volume are greatly reduced. (2) Is safe and reliable. The electrified generating line of GIS transformer substation is whole sealed in the metal casing of ground connection, can prevent that operating personnel from accidental contact electrified body. In addition, the closed metal shell isolates the influence of the external severe weather environment, thereby improving the reliability of the operation of the system. (3) Is beneficial to environmental protection. The electromagnetic radiation generated by the closed GIS transformer substation has little influence on workers and the surrounding environment, so the planning and the design are more convenient. (4) The equipment is comparatively simple and the maintenance cycle is long.
Meanwhile, the popularization of GIS brings a new problem. When a switch on a high-voltage bus in the GIS is switched to a vacant bus, the contact gap is broken down to generate an arc, so that the voltage at two ends of the switch drops rapidly to generate step voltage, which is also called Overvoltage (VFTO for short) in a Very Fast Transient process. VFTO can develop over-voltage phenomena in certain locations of the GIS and can compromise the insulation of other high voltage equipment. When the very fast Transient overvoltage is transmitted to the outside, wave refraction and wave reflection occur when the wave impedance is discontinuous, and Transient Ground Potential Rise (TGPR) is formed on the shell of the bus shell. This voltage can cause malfunction and even damage of the control and protection equipment. According to the statistics of the international large power grid (CIGRE), more than half of power stations have transient earth potential rise (TGPR) accidents. The Transient earth potential rise caused by the operation of a GIS disconnector is referred to in the International Electrotechnical Commission (IEC) document as the Transient Enclosure Voltage (TEV) of the GIS.
In a substation, operations such as disconnecting switches and breaker opening and closing are routine operations. In general air-insulated substations, harmful overvoltages are not caused, but in GIS substations, these operations may generate more harmful VFTO, especially for disconnectors without arc extinguishing capability.
By the electrical characteristics of GIS and the transient overvoltage generation mechanism, VFTO has the following general characteristics:
(1) the wavefront is steep, and its rise time is usually 5-20 ns. Since the arcing time is very short when the contact gap of the disconnector is restrike, its voltage waveform has a very high steepness of rise or fall.
(2) The VFTO amplitude can theoretically be up to 3.0p.u., an extreme case that occurs when the voltages across the opened end branch are opposite in polarity and are all at a maximum. Considering actual reasons such as residual voltage and damping attenuation, most of VFTO obtained in actual measurement and simulation tests does not exceed 2.0p.u., and considering the most serious condition, the maximum overvoltage can reach about 2.5-2.8 p.u.
(3) VFTO has a large number of high frequency components, typically in the range of 30kHz to I00 MHz. This is because the GIS transformer substation mainly uses SF6 gas as a medium, and compared with the air-insulated transformer substation of the same type, the insulation strength of SF6 gas is far higher than that of air, and the distance between adjacent electrical devices and the length of a bus bar are short, so once a VFTO traveling wave is generated, the time for refraction and reflection in the GIS is very short, and the transient oscillation frequency is increased sharply due to repeated accumulation and superposition.
(4) The amplitude, frequency, rising gradient and other relevant characteristics of the VFTO mainly depend on the operation wiring mode of the GIS, and are closely related to the reignition (arc extinction) time of the isolating switch and the position of the isolating switch on the bus.
Due to the skin effect of high frequency, the transient electromagnetic waves are confined inside the GIS, forming a transmission line inside the conductor-housing, where they are refracted and reflected when they encounter discontinuities (cables, overhead lines), and the transient waves are transmitted to the outside of the bushing. Although the impedance values of the ground conductor and the ground resistor are negligible in the case of a power frequency short circuit, their impedances are inductive, and the impedance values rapidly increase with increasing frequency. Thus, operating overvoltages at frequencies up to several hundred mhz induce a TGPR voltage of several tens of kilovolts high between the metal casing and ground. If it is not restricted, spark discharges can occur, for example between the housing and the shield of the high-voltage cable. Although the amplitude decays very quickly, it can still endanger the personal safety of the plant personnel.
There are two main types of coupling modes of VFTO to secondary devices: the first is conductive coupling and the second is radiation coupling. Conductive coupling refers to coupling from a direct electrical connection between an interfering source and an object subject to interference. Radiative coupling refers to the coupling of an interfering source to an interfered object through a spatial electromagnetic field (including an electric field, a magnetic field, or both). For a GIS transformer substation, the conduction coupling is divided into two modes, namely, firstly, VFTO is transmitted into a secondary cable connected with the VFTO through a stray capacitor in a voltage transformer or a current transformer and then enters secondary equipment; the other mode is that transient overvoltage enters a shielding layer of the secondary cable which is grounded through a ground network, and then a core wire of the secondary cable is induced. The radiation coupling is induced to the secondary cable by an electromagnetic field generated by the metal housing.
Therefore, intensive research on the way VFTO conductively couple in GIS devices is needed. Two different circuit models must be established. The first circuit model is formed by a shielded high-voltage conductor and the inner side of the shell, and the second circuit model is formed by an external circuit formed by the outer surface of the shell and a grounding conductor on a grounding grid. By utilizing the experimental device for simulating the VFTO conduction shrinkage of the GIS equipment, the change rule of the TGPR caused by the change of the amplitude and the frequency in the VFTO conduction process in the GIS equipment can be researched.
Because the appearance size of the VFTO conduction equivalent miniature experimental device for simulating the GIS equipment is small, and the experimental voltage is only dozens of hundreds of volts, the VFTO generated by the operation of an isolating switch in the equivalent simulation GIS equipment is a difficult point. Because the speed of the contacts is not high when the disconnecting switch of the real GIS is operated, the contacts are not contacted yet as the distance between the two contacts becomes shorter during the operation due to the high voltage level, but the insulating SF6 is broken down to generate VFTO due to the high voltage level. However, the overall dimension of the equivalent miniature experimental device for simulating the conduction of the VFTO of the GIS equipment is far smaller than that of a real GIS equipment, and the direct measurement technology is adopted to research the conduction of the VFTO, so that the voltage is hundreds, and the breakdown of an insulating medium between contacts is difficult to generate so as to generate the VFTO. Therefore, the high-speed switch which generates the pulse gradient under the limited space size and the low voltage and meets the pulse gradient range generated by the breakdown of the insulating gas when the isolating switch of the real GIS equipment is operated is successfully developed, and the high-speed switch is a key component for simulating whether the VFTO conduction miniature experimental device of the GIS equipment can achieve the expected purpose.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-speed switch for a VFTO conduction miniature experimental device for simulating GIS equipment.
The invention is realized in this way, a high-speed switch for simulating a GIS device VFTO conduction miniature experimental device comprises:
the method comprises the following steps:
the three ports of the three-way shell are provided with connecting flanges which are used for connecting the two ends of the straight-through pipe with the miniature GIS equipment pipeline;
the main insulator is arranged in a through pipe of the three-way shell and comprises two identical parts which are symmetrically installed in a matching way, and a cavity which are matched with the connecting plug are processed at the position of a shaft core in the middle of the main insulator;
the wet reed pipe is arranged in the cavity of the main insulator and used for controlling the on-off of the loop;
the operating rod insulator is arranged in a right-angle pipe of the three-way shell, a through hole with two ends with different diameters is processed on the axis, and one end of the larger through hole is matched with the groove on the main insulator;
the operating rod is in clearance fit with the smaller through hole of the operating rod insulator, one end of the operating rod is connected with the permanent magnet through threads, and the other end of the operating rod is connected with the positioning rod through threads;
one end of the positioning rod is provided with a stud connected with the operating rod, and the other end of the positioning rod is provided with a threaded hole connected with the handle and used for driving the operating rod and the permanent magnet to move in the operating rod insulator;
the positioning structure comprises a flange body, a positioning steel ball, a positioning spring and an adjusting screw, and is used for positioning the position of the positioning rod.
Furthermore, a through hole is processed in the axis of the flange body and is in clearance fit with the positioning rod, the positioning rod can move along the through hole, 3 positioning holes which are uniformly distributed in the circumference are processed in the outer diameter direction of the boss of the flange body, and the positioning holes are in clearance fit with the positioning steel balls, the positioning springs and the adjusting screws.
Furthermore, a clamp spring groove is formed in the outer diameter of the flange body boss, a clamp spring is fixed on the inner side of the clamp spring groove in a matched mode, the outer diameter of the flange body boss is in clearance fit with the inner diameter of the waterproof cover, and a groove matched with the clamp spring is formed in the inner cylindrical surface of the waterproof cover. A waterproof cover for dust and water prevention during non-use.
Furthermore, two V-shaped grooves matched with the positioning steel balls are formed in the outer diameter circumference of the positioning rod.
Further, a groove matched with the operating rod insulator is machined in the main insulator.
Furthermore, the axial processing of connecting plug one end has great hole to radially processing has 4 narrow grooves that are used for pegging graft inside conducting rod of miniature GIS equipment pipeline, and the other end processing has round platform and square platform, and the die cavity cooperation in round platform and the square platform and the main insulator.
Furthermore, a small hole is axially processed at the end of a square table of the connecting plug, a jackscrew hole is radially processed at the square table, the small hole is used for inserting one end pin of the wet reed pipe, and the pin is tightly pressed by the jackscrew after being inserted.
Furthermore, a sealing groove is formed in the flange end face of one end port of the straight-through pipe of the three-way shell, and an O-shaped sealing ring is installed in the sealing groove.
Furthermore, a sealing groove is processed on the end face, connected with the three-way shell, of the flange body, and an O-shaped sealing ring is installed in the sealing groove.
Furthermore, the operating rod is made of ceramic materials, and threads are machined at two ends of the operating rod.
The invention also aims to provide application of the VFTO conduction miniature experimental device for carrying the GIS equipment to electrical equipment experiments.
By combining all the technical schemes, the invention has the advantages and positive effects that: the method can generate a pulse waveform with gradient meeting the gradient range of VFTO waveform generated by insulation gas breakdown during operation of a real GIS equipment isolating switch under low voltage, and corrects a simulation model and a simulation method by utilizing a direct measurement method and researching the conduction of the steep wave in the miniature GIS equipment pipeline. And further researching the conduction rule and mechanism of the VFTO in the GIS equipment. The simulation precision is improved, and the problems that the true GIS is high in voltage level, cannot be directly measured and is difficult to conduct conduction rule and mechanism research of VFTO in GIS equipment are solved.
The invention selects the wet reed tube containing mercury inside, avoids the vibration of a switch reed in the rapid switching process, achieves the effect of simulating a VFTO conduction micro-shrinkage experimental device main loop of GIS equipment by rapid switching on and off by utilizing the rapid switching characteristic of the wet reed tube, generates the pulse waveform with the gradient within tens of nanoseconds, and operates the switching on and off of the contact inside the wet reed tube by means of the relative distance change between the permanent magnet and the wet reed tube and the magnetic field. The pulse gradient generated by the switching operation accords with the pulse gradient range generated by insulation gas breakdown during the operation of the isolating switch of the real GIS equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is an explosion diagram of a high-speed switch structure for a VFTO conduction miniature experimental apparatus for simulating GIS equipment according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a high-speed switch for a VFTO conduction miniature experimental apparatus for simulating GIS equipment according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a positioning structure according to an embodiment of the present invention.
In the figure: 1. a three-way housing; 2. a first main insulator; 3. a second main insulator; 4. a connecting plug; 5. an operating rod insulator; 6. an operating lever; 7. a permanent magnet; 8. a flange body; 9. a clamp spring; 10. a handle; 11. a waterproof cover; 12. positioning a rod; 13. positioning the steel balls; 14. a positioning spring; 15. an adjusting screw; 16. a wet reed pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a high-speed switch for simulating a VFTO conduction miniature experimental device of GIS equipment, and the invention is described in detail with reference to the attached drawings.
As shown in fig. 1 to fig. 3, the high-speed switch for simulating the VFTO conduction shrinkage experimental apparatus of the GIS device provided by the embodiment of the present invention includes: the three-way switch comprises a three-way shell 1, a first main insulator 2, a second main insulator 3, a connecting plug 4, an operating rod insulator 5, an operating rod 6, a permanent magnet 7, a flange body 8, a clamp spring 9, a handle 10, a waterproof cover 11, a positioning rod 12, a positioning steel ball 13, a positioning spring 14, an adjusting screw 15 and a wet spring pipe 16.
The tee joint shell 1 is made of metal materials, the shape of the tee joint shell is T-shaped, connecting flanges are arranged at three ports, and a sealing groove is formed in the flange end face of the left port of the straight-through pipe of the tee joint shell 1 and used for installing an O-shaped sealing ring. Two ports of a straight-through pipe of the three-way shell are used for being connected with a micro GIS equipment pipeline. A first main insulator 2, a second main insulator 3, a connecting plug 4 and a wet reed pipe 16 are arranged in the three-way shell straight-through pipe.
The main insulator is divided into a first main insulator 2 and a second main insulator 3 which are the same and are made of insulating materials, the two parts are symmetrically installed in a matched mode, and the main insulator is installed in a straight-through pipe of the three-way shell. The axial core positions of the first main insulator 2 and the second main insulator 3 are provided with a cavity matched with the connecting plug 4 and a cavity for installing the wet reed pipe 16. The connecting plug 4 and the wet reed pipe 16 are arranged in the cavity. The main insulator is formed with a groove for fitting the operating rod insulator 5.
The connecting plug 4 is made of metal materials, a large inner hole is formed in one end in the axial direction, 4 narrow grooves are formed in the radial direction and used for being inserted with a conducting rod inside a miniature GIS equipment pipeline, a round table and a square table are formed in the other end in the axial direction and matched with cavities in the first main insulator 2 and the second main insulator 3, and the connecting plug 4 can be prevented from being pulled out of the main insulators or rotating. The square table end of the connecting plug 4 is axially processed with a small hole, the square table is radially processed with a jackscrew hole, the small hole is used for inserting one end pin of the wet reed pipe, and the pin can be tightly pressed by the jackscrew after being inserted.
The operation rod insulator 5 is made of an insulating material and is cylindrical. The axis is provided with a through hole, one end of the through hole is larger and is in clearance fit with the outer diameter of the permanent magnet 7. One end of the small hole is in clearance fit with the outer diameter of the operating rod 6, and the operating rod and the permanent magnet can move up and down along the axial direction of the insulator of the operating rod. After the main insulator is installed in the tee casing straight-through pipe, the operating rod insulator is installed in the right-angle pipe of the tee casing, and one end of a large hole of the operating rod insulator is matched with a groove in the main insulator, so that the main insulator can be limited from being drawn out of the tee casing, and the connecting plug and the wet reed pipe are limited from being drawn out.
The operating rod 6 is made of ceramic materials, threads are machined at two ends of the operating rod, and one end of the operating rod is used for connecting and installing the permanent magnet 7. The other end is connected with a positioning rod 12. The operating rod is installed in the operating rod insulator, and the locating lever can drive the operating rod and the permanent magnet to move in the operating rod insulator.
The flange body 8 is formed by processing a metal material, a through hole is processed in the axis of the flange body 8 and is in clearance fit with the positioning rod 12, the positioning rod 12 can move along the through hole, a clamp spring groove is processed in the outer diameter of a boss of the flange body and is matched with a clamp spring, and the outer diameter of the boss is in clearance fit with the inner diameter of the waterproof cover 11. 3 positioning holes are circumferentially and uniformly distributed in the outer diameter direction of a boss of the flange body 8, and the positioning holes are in clearance fit with the positioning steel balls 13, the positioning springs 14, the adjusting screws 15 and the positioning steel balls. The end face of the flange body connected with the three-way shell is provided with a sealing groove for installing an O-shaped sealing ring.
The clamp spring 9 is used for being matched with the flange body and connecting and fixing the waterproof cover 11. When the waterproof cover is inserted, the outer diameter of the clamp spring is reduced, and after the waterproof cover is installed in place, the clamp spring is restored to the original state, so that the waterproof cover is prevented from falling off.
The handle 10 is made of insulating material, one end of the handle is connected with the positioning rod, and the positioning rod, the operating rod and the permanent magnet are driven to move during operation.
The waterproof cover 11 is made of nylon materials, a groove is formed in the inner cylindrical surface of the waterproof cover, and the groove is matched with the clamp spring 9, so that the waterproof cover can be prevented from falling off. A waterproof cover for dust and water prevention during non-use.
The positioning rod 12 is made of metal material, is cylindrical, and is subjected to heat treatment, and the hardness reaches more than HRC 45. A stud is processed at one end of the positioning rod cylinder and is connected with the operating rod. The other end is provided with a threaded hole and is connected with the handle. Two V-shaped grooves are processed on the circumference of the outer diameter of the positioning rod. The positioning structure comprises a positioning rod 12, a flange body 8, a positioning steel ball 13, a positioning spring 14 and an adjusting screw 15. When the handle drives the positioning rod, the operating rod and the permanent magnet to move along the axis of the flange body, the positioning rod pushes the steel ball to compress the spring to move backwards, and when the positioning rod moves to the position of the annular groove, the steel ball is ejected out of the annular groove under the action of the spring to complete positioning. The magnitude of the positioning force can be adjusted by means of the adjusting screw 15.
The positioning steel ball 13, the positioning spring 14 and the adjusting screw 15 are standard parts.
The three-way shell 1 and the flange body 8 are made of stainless steel, and the flanges of the three-way shell and the flange body are the same as the flanges of the miniature GIS equipment pipelines so as to be convenient to install.
The main insulator is divided into a first main insulator 2, a second main insulator 3 and an operating rod insulator 5, and polytetrafluoroethylene is adopted for processing, so that sufficient insulating strength is guaranteed, and meanwhile, the polytetrafluoroethylene has a self-lubricating effect, so that the operating rod can move smoothly.
The connecting plug is made of beryllium bronze so as to ensure that the connecting plug has enough elastic performance and is in good electric contact with the conductive core inside the miniature GIS equipment.
The operating rod is made of ceramic materials, so that the operating rod has enough insulation strength and enough mechanical strength.
The positioning rod 12 is made of T7 steel through heat treatment, so that sufficient hardness is guaranteed, and the service life is further guaranteed.
The handle 10 and the waterproof cover 11 are made of nylon materials. And the rest parts adopt standard parts.
When the high-speed switch for simulating the VFTO conduction miniature experimental device of the GIS equipment needs to be operated to open and close a loop, the waterproof cover 11 is pulled upwards to expose the handle 10, and when the handle is positioned at the upper part (pulled-out position), the switch is in an off state. When the switch is in an off state, the positioning steel ball 13 is positioned in a groove below the positioning rod 12 under the action of the spring 14. At the moment, the operating rod 6 connected with the positioning rod and the permanent magnet 7 mounted on the operating rod are also positioned at the upper part, the distance between the permanent magnet and the wet reed pipe is the largest, the magnetic force applied to the wet reed pipe is smaller than the elastic force of the wet reed pipe contact, and the wet reed pipe contact is in a disconnected state.
And (3) connecting the assembled VFTO conduction miniature experimental device for simulating the GIS equipment into the miniature GIS equipment by using a high-speed switch. When the device is used, after all experimental loops are built, the waterproof cover 11 is pulled upwards, and the waterproof cover is taken down. When the handle 10 is in the upper (pulled out position) it indicates that the switch is now off. The handle 10 being in the lower position indicates that the switch is now in the closed position. It needs to be pulled out to put the switch in an off state. After all the experimental loops are checked to be correct, the power can be switched on to start the experiment.
When the loop needs to be closed, the handle 10 is pressed down, the positioning rod 12 connected with the handle, the operating rod 6 and the permanent magnet 7 move downwards, the positioning steel balls 13 are pushed out of the grooves by the positioning rod 12, and the spring 14 is compressed. When a groove on the positioning rod moves downwards to the positioning steel ball 13, the positioning steel ball 13 is ejected to the groove on the positioning rod 12 under the action of the spring 14, and the positioning is completed. At the moment, the operating rod 6 and the permanent magnet 7 connected with the positioning rod also move to the bottom, the distance between the permanent magnet and the wet reed pipe is close, the magnetic force applied to the wet reed pipe is increased to the elastic force of the wet reed pipe contact, and the wet reed pipe contact is closed. The switch disconnection process is the reverse of this process.
The invention is further described below with reference to specific experiments.
When the real 330KV GIS experimental device loads 50KV voltage to perform isolation switch closing in a no-load mode, the 50KV GIS real experimental device isolation switch closing voltage waveform recording is expanded, and the closing voltage waveform diagram acquired by an indirect method is explained, and the recording time is 500 ms. The high frequency voltage rise steepness is 24 ns.
In the display of the recorded transient voltage waveform of the closing of the 500kV GIS disconnecting switch of the transformer substation, the rising gradient of the high-frequency voltage is 40ns, and the equivalent frequency is 6.3 MHz.
In the VFTO conduction miniature experimental device for simulating the GIS equipment using the high-speed switch, disclosed by the embodiment of the invention, the high-frequency voltage rising gradient is 22ns in analyzing the transient voltage and ground potential waveform (the influence (200V, 50 omega) of high-frequency steep waves on ground potential rising) acquired by the influence of transient voltage pulse conduction on the ground potential. It can be seen that the steepness of the steep wave pulse generated by the high-speed switch in the embodiment of the invention conforms to the range of the pulse steepness generated by insulation gas breakdown during the operation of the isolating switch of the true GIS equipment.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the purpose of illustrating the embodiments of the present invention, and the scope of the present invention should not be limited thereto, and any modifications, equivalents and improvements made by those skilled in the art within the technical scope of the present invention as disclosed in the present invention should be covered by the scope of the present invention.
Claims (9)
1. A high-speed switch for simulating a GIS (geographic information system) device VFTO conduction miniature experimental device is characterized by comprising:
the three ports of the three-way shell are provided with connecting flanges which are used for connecting with a miniature GIS equipment pipeline through two ends of a straight-through pipe;
the main insulator is arranged in a through pipe of the three-way shell and comprises two identical parts which are symmetrically installed in a matching way, and a cavity which are matched with the connecting plug are processed at the position of a shaft core in the middle of the main insulator;
the wet reed pipe is arranged in the cavity of the main insulator and used for controlling the on-off of the loop;
the operating rod insulator is arranged in a right-angle pipe of the three-way shell, a through hole with different diameters at two ends is processed at the axis, and one end of the larger through hole is matched with the groove on the main insulator;
the operating rod is in clearance fit with the smaller through hole of the operating rod insulator, one end of the operating rod is connected with the permanent magnet through threads, and the other end of the operating rod is connected with the positioning rod through threads;
one end of the positioning rod is provided with a stud connected with the operating rod, and the other end of the positioning rod is provided with a threaded hole connected with the handle and used for driving the operating rod and the permanent magnet to move in the operating rod insulator;
the positioning structure comprises a flange body, a positioning steel ball, a positioning spring and an adjusting screw and is used for positioning the position of the positioning rod;
the flange body axis is provided with a through hole in clearance fit with a positioning rod, the positioning rod can move along the through hole, 3 positioning holes are circumferentially and uniformly distributed in the outer diameter direction of a flange boss of the flange body, and the positioning holes are in clearance fit with positioning steel balls, positioning springs and adjusting screws.
2. The high-speed switch for simulating the VFTO conduction shrinkage experiment device of the GIS equipment as claimed in claim 1, wherein a clamp spring groove is formed in the outer diameter of the flange body boss, a clamp spring is fittingly fixed on the inner side of the clamp spring groove, the outer diameter of the flange body boss is in clearance fit with the inner diameter of a waterproof cover, and a groove matched with the clamp spring is formed in the inner cylindrical surface of the waterproof cover.
3. The high-speed switch for simulating the VFTO conduction miniature experiment device of the GIS equipment as claimed in claim 1, wherein two V-shaped grooves matched with the positioning steel balls are processed on the outer diameter circumference of the positioning rod.
4. The high-speed switch for simulating the VFTO conduction shrinkage experimental device of the GIS equipment as claimed in claim 1, wherein the main insulator is provided with a groove matched with the operating rod insulator.
5. The high-speed switch for simulating the VFTO conduction shrinkage experimental device of the GIS equipment as claimed in claim 1, wherein one end of the connecting plug is axially processed with a larger inner hole, 4 narrow grooves for inserting the conducting rods inside the pipeline of the GIS equipment are radially processed, and the other end of the connecting plug is processed with a round table and a square table which are matched with a cavity in the main insulator.
6. The high-speed switch for simulating the VFTO conduction shrinkage experimental device of the GIS equipment as claimed in claim 5, wherein a small hole is axially processed at the square table end of the connecting plug, a jackscrew hole is radially processed at the square table, the small hole is used for inserting one end pin of the wet reed pipe, and the pin is tightly pressed by a jackscrew after being inserted.
7. The high-speed switch for simulating the VFTO conduction miniature experiment device of the GIS equipment as claimed in claim 1, wherein a sealing groove is formed on the flange end face of one end port of the straight-through pipe of the three-way housing, and an O-shaped sealing ring is installed in the sealing groove.
8. The high-speed switch for simulating the VFTO conduction miniature experimental device of the GIS equipment as claimed in claim 1, wherein a sealing groove is processed on the end face of the flange body connected with the three-way housing, and an O-shaped sealing ring is installed in the sealing groove;
the operating rod is made of ceramic materials, and threads are machined at two ends of the operating rod.
9. An application of the VFTO conduction miniature experimental device for simulating the GIS equipment according to any one of claims 1-8 to an electric power equipment experiment.
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| CN112433129A (en) | 2021-03-02 |
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