CN114236253B - Surface charge measurement system of super/extra-high voltage wall bushing scaling model - Google Patents
Surface charge measurement system of super/extra-high voltage wall bushing scaling model Download PDFInfo
- Publication number
- CN114236253B CN114236253B CN202111520095.6A CN202111520095A CN114236253B CN 114236253 B CN114236253 B CN 114236253B CN 202111520095 A CN202111520095 A CN 202111520095A CN 114236253 B CN114236253 B CN 114236253B
- Authority
- CN
- China
- Prior art keywords
- extra
- ultra
- high voltage
- grounding
- wall bushing
- 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.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/24—Arrangements for measuring quantities of charge
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a surface charge measuring system of a scale model of an ultra/extra-high voltage wall bushing, which comprises a grounding shell body, a high-voltage electrode, a scale bushing and a fixed scale bushing supporting piece which are coaxially arranged, wherein a programmable stepping motor, an electric sliding table and a surface charge measuring probe on the electric sliding table are fixedly arranged on the grounding shell. The scale model of the ultra/extra-high voltage wall bushing can be divided into two structures including an epoxy core and not including the epoxy core, and can truly reflect the surface charge distribution of the ultra/extra-high voltage wall bushing in the actual state. The interior of the sleeve can be filled with different gases to study the surface charge distribution of the wall bushing under different insulating gases. Under the drive of the programmable stepping motor, the surface charge measuring probe can scan the surface of the outer insulating cylinder of the ultra/extra-high voltage wall bushing scale model according to different paths, and the obtained related data can provide theoretical basis for the structure optimization design, the service life evaluation and the fault analysis of the wall bushing.
Description
Technical Field
The invention belongs to the field of electrical engineering, particularly relates to the field of research on a surface charge distribution mechanism of an electrical insulation structure of ultra/extra-high voltage direct current transmission equipment, and relates to a surface charge measurement system of an ultra/extra-high voltage wall bushing scaling model.
Background
The extra-high voltage sleeve is used as an inlet wire and an outlet wire device of an extra-high voltage alternating current transformer and an extra-high voltage converter transformer, is used for leading current into or out of a metal box shell of the transformer when an extra-high voltage current-carrying conductor penetrates through a metal shell of the transformer with a different potential from the extra-high voltage current-carrying conductor, plays a role in insulation and mechanical support, integrates current, heat, force and chemical properties into a whole, and is one of key devices for developing extra-high voltage transmission. The extra-high voltage direct current wall bushing is used as the only channel for connecting a valve hall and a direct current field in a converter station, is core equipment for bearing the full voltage and the full current of a system, and is vital to the whole system for ensuring the safe operation of the system.
Space charge accumulation phenomenon exists on the surface of the gas-solid insulation and inside the solid insulation under direct current voltage. The existence, migration and disappearance of space charges can directly cause the distortion of local electric fields on the surface and inside of the dielectric medium, thereby not only affecting the characteristics of the material such as conductance, local discharge, breakdown damage, electrical aging and the like, but also affecting the operation reliability and long-term service life of equipment. However, due to the complex theory of medium space charge accumulation under direct current, the mechanism of influence on the design and operation of the bushing is not clear. Therefore, the research on the potential and charge distribution mechanism of the surface of the insulation structure of the ultra/extra-high voltage direct current bushing is of great significance, and a set of surface charge measurement system capable of considering the ultra/extra-high voltage wall bushing under various structures needs to be designed.
Disclosure of Invention
In order to solve the charge accumulation characteristic of the ultra/extra-high voltage wall bushing under direct-current voltage, the invention aims to provide the surface charge measurement system of the scale model of the ultra/extra-high voltage wall bushing.
The technical scheme adopted by the invention is as follows:
a surface charge measurement system of an ultra/extra-high voltage wall bushing scale model comprises a grounding shell body, a charge measurement probe, a metal shielding plate, a probe driving mechanism and an ultra/extra-high voltage wall bushing scale model;
the ultra/extra-high voltage wall bushing scaling model is coaxially arranged in the inner cavity of the grounding shell body and is fixed in the inner cavity of the grounding shell body through a fixed scaling bushing support piece; the fixed-scale sleeve supporting piece adopts a conductor, one end of the fixed-scale sleeve supporting piece is in contact with a grounding flange on the ultra/extra-high voltage wall bushing scale model, and one end of the fixed-scale sleeve supporting piece is connected with the grounding shell body;
one end of the grounding shell body is provided with an insulation structure, and a high-voltage electrode of the ultra/extra-high voltage wall bushing scaling model is isolated from the grounding shell body through the insulation structure;
the wall surface of the grounding shell body is provided with a measuring charge probe mounting hole which is a long hole, the length direction of the long hole is arranged along the axial direction of the grounding shell body, the metal shielding plate cover is arranged at the outer end of the measuring charge probe mounting hole, and the measuring charge probe is arranged on the metal shielding plate and extends into the inner cavity of the grounding shell body through the measuring charge probe mounting hole;
the probe driving mechanism is connected with the metal shielding plate and can drive the metal shielding plate to move along the axial direction of the grounding shell body.
Preferably, the probe driving mechanism comprises a programmable stepping motor and an electric sliding table, the programmable stepping motor is connected with the electric sliding table, and the metal shielding plate is arranged on the electric sliding table.
Preferably, the ultra/extra-high voltage wall bushing scaling model comprises a first outer insulating cylinder, a second outer insulating cylinder, a central current-carrying conductor and a high-voltage electrode, wherein one end of the first outer insulating cylinder is hermetically connected with a first end cover, and the other end of the first outer insulating cylinder is provided with a first grounding flange; one end of the second external insulation cylinder is hermetically connected with a second end cover, and the other end of the first external insulation cylinder is provided with a second grounding flange;
the first grounding flange is connected with the second grounding flange in a sealing manner, the first outer insulating cylinder and the second outer insulating cylinder are coaxial, the first outer insulating cylinder, the second outer insulating cylinder, the first end cover, the second end cover, the first grounding flange and the second grounding flange are connected to form a sealed cavity, the central current-carrying conductor is arranged in the sealed cavity, one end of the central current-carrying conductor is connected with the first end cover, and the other end of the central current-carrying conductor is connected with the second end cover;
one end of the high-voltage electrode penetrates through the first end cover and is connected with one end of the central current-carrying conductor, and the other end of the high-voltage electrode extends to the outside of the grounding shell body;
the first end cover and the second end cover are respectively provided with an end shielding cover at two ends of the central current-carrying conductor, the first grounding flange and the second grounding flange are connected with an in-sleeve shielding electrode, and the in-sleeve shielding electrode is sleeved on the periphery of the central current-carrying conductor.
Preferably, the first grounding flange and the second grounding flange are connected through threads, and a sealing ring is arranged at the connecting part.
Preferably, the fixed-scale sleeve support piece is of an annular structure, the fixed-scale sleeve support piece is sleeved on the peripheries of the first grounding flange and the second grounding flange, and the inner ring of the fixed-scale sleeve support piece is in clearance fit or interference fit with the outer surface of the first grounding flange and the outer surface of the second grounding flange; the outer ring of the fixed-scale sleeve supporting piece is in contact with or fixedly connected with the inner wall of the grounding shell body.
Preferably, the first outer insulating cylinder is detachably and hermetically connected with the first end cover, and the second outer insulating cylinder is detachably and hermetically connected with the second end cover.
Preferably, the outer portion of the central current carrying conductor is clad with an epoxy core.
Preferably, the inner cavity of the ultra/extra-high voltage wall bushing scaling model is filled with simulation gas, and the simulation gas is SF 6 Gas or N 2 And SF 6 The mixed gas of (1).
Preferably, one end of the grounding shell body, which is provided with the insulating structure, is a detachable end face;
the bottom both ends of ground connection shell body are equipped with ground connection shell mounting respectively, and the shape of ground connection shell body is cylindrical, has seted up the arc recess on the ground connection shell mounting, and the diameter of arc recess is the same with the diameter of ground connection shell body.
The invention relates to a working method of a surface charge measuring system of a scale model of an ultra/extra-high voltage wall bushing, which comprises the following steps:
filling simulation gas into an inner cavity of the ultra/extra-high voltage wall bushing scale model in advance, and then installing the ultra/extra-high voltage wall bushing scale model on a fixed scale bushing support piece;
applying a selected voltage to a high-voltage electrode of the ultra/extra-high voltage wall bushing scaling model, and continuously applying a voltage for a preset duration according to experimental requirements;
and after the voltage pressurization is finished, removing the voltage, grounding the high-voltage electrode, driving the measurement charge probe to move along the installation hole of the measurement charge probe according to the preset requirement through the probe driving mechanism, and acquiring the surface charge of the ultra/extra-high voltage wall bushing scaling model on the path by the measurement charge probe in the moving process.
The invention has the following beneficial effects:
in the surface charge measurement system of the ultra/extra-high voltage wall bushing scale model, the actual operation condition of the ultra/extra-high voltage wall bushing can be correctly simulated by using the ultra/extra-high voltage wall bushing scale model, and the insulation surface charge distribution of the ultra/extra-high voltage wall bushing in various insulation structures can be researched by using the ultra/extra-high voltage wall bushing scale models with different structures. The probe driving mechanism can be utilized to drive the measurement charge probe to realize the measurement under the preset various paths, so that the distribution mechanism of the surface charge of the insulating structure is analyzed from multiple aspects. The relevant conclusion obtained by the method can provide theoretical basis for the structure optimization design, the service life evaluation and the fault analysis of the wall bushing.
Drawings
FIG. 1 (a) is a front view of a surface charge measurement system of a scale model of an ultra/extra-high voltage wall bushing in an embodiment of the invention; FIG. 1 (b) is an isometric view of a surface charge measurement system of an ultra/extra high voltage wall bushing scale model in an embodiment of the invention;
FIG. 2 is a longitudinal section of a surface charge measuring system of the ultra/extra-high voltage wall bushing scale model in the embodiment of the invention;
FIG. 3 is a schematic structural diagram of the surface charge measurement system of the ultra/extra-high voltage wall bushing scale model in the embodiment of the invention when the ultra/extra-high voltage wall bushing scale model is not installed;
FIG. 4 is a schematic structural diagram of an ultra/extra-high voltage wall bushing scale model in a surface charge measurement system of the ultra/extra-high voltage wall bushing scale model in the embodiment of the invention;
FIG. 5 is a schematic diagram of a central current-carrying conductor structure of an ultra/extra-high voltage wall bushing scaling model in a surface charge measurement system of the ultra/extra-high voltage wall bushing scaling model according to the embodiment of the invention;
FIG. 6 is a system configuration diagram of a surface charge measurement system of the ultra/extra-high voltage wall bushing scale model in the embodiment of the invention.
In the figure, a 1-1 high-voltage electrode, a 1-2 insulation structure, a 1-3 fixed scaling sleeve support piece, a 1-4 grounding shell fixing piece, a 3-1 grounding shell body, a 3-2 measurement charge probe mounting hole, a 3-3 metal shielding plate, a 3-4 electric sliding table, a 3-5 programmable stepping motor, a 4-1 end cover, a 4-2 end shielding cover, a 4-3 outer insulation cylinder, a 4-4 central current-carrying conductor, a 4-5 sleeve inner shielding electrode, a 4-6 grounding flange left side, a 4-7 grounding flange right side and a 5-1 epoxy core are arranged.
Detailed Description
The present invention will be further described with reference to the following examples.
Referring to fig. 1 (a) -3, the surface charge measurement system of the ultra/extra-high voltage wall bushing scaling model comprises a grounding shell body 3-1, a charge measurement probe, a metal shielding plate 3-3, a probe driving mechanism and the ultra/extra-high voltage wall bushing scaling model; the ultra/extra-high voltage wall bushing scaling model is coaxially arranged in the inner cavity of the grounding shell body 3-1 and is fixed in the inner cavity of the grounding shell body 3-1 through a fixed scaling bushing support 1-3; the fixed-scale sleeve support piece 1-3 adopts a conductor, one end of the fixed-scale sleeve support piece 1-3 is in contact with a grounding flange on the ultra/extra-high voltage wall bushing scale model, and one end of the fixed-scale sleeve support piece 1-3 is connected with the grounding shell body 3-1; one end of the grounding shell body 3-1 is provided with an insulation structure 1-2, and a high-voltage electrode 1-1 of the ultra/extra-high voltage wall bushing scale model is isolated from the grounding shell body 3-1 through the insulation structure 1-2; the wall surface of the grounding shell body 3-1 is provided with a measuring charge probe mounting hole 3-2, the measuring charge probe mounting hole 3-2 is a long hole, the length direction of the long hole is arranged along the axial direction of the grounding shell body 3-1, the metal shielding plate 3-3 is covered at the outer end of the measuring charge probe mounting hole 3-2, the measuring charge probe is arranged on the metal shielding plate 3-3 and extends into the inner cavity of the grounding shell body 3-1 through the measuring charge probe mounting hole 3-2, the metal shielding plate 3-3 can shield the measuring charge probe mounting hole 3-2, and the influence of an external field on the electric field of the inner cavity of the grounding shell body 3-1 and the surface charge distribution of the ultra/extra-high voltage wall bushing shrinkage ratio model is prevented; the probe driving mechanism is connected with the metal shielding plate 3-3 and can drive the metal shielding plate 3-3 to move along the axial direction of the grounding shell body 3-1.
Referring to fig. 1 (a), 1 (b) and 3, the probe driving mechanism comprises a programmable stepping motor 3-5 and an electric sliding table 3-4, the programmable stepping motor 3-5 is connected with the electric sliding table 3-4, and a metal shielding plate 3-3 is arranged on the electric sliding table 3-4. The programmable stepping motor 3-5 can drive the electric sliding table 3-4 to move according to a preset program, the electric sliding table 3-4 further drives the metal shielding plate 3-3 to move, and the metal shielding plate 3-3 synchronously drives the charge measuring probe to move.
As a preferred embodiment of the invention, referring to fig. 1 (a), fig. 1 (b), fig. 2 and fig. 4, the scale model of the ultra/extra-high voltage wall bushing comprises a first outer insulating cylinder, a second outer insulating cylinder, a central current-carrying conductor 4-4 and a high-voltage electrode 1-1, wherein one end of the first outer insulating cylinder is hermetically connected with a first end cover, and the other end of the first outer insulating cylinder is provided with a first grounding flange; one end of the second external insulation cylinder is hermetically connected with a second end cover, and the other end of the first external insulation cylinder is provided with a second grounding flange; the first grounding flange is connected with the second grounding flange in a sealing mode, the first outer insulating cylinder and the second outer insulating cylinder are coaxial, the first outer insulating cylinder, the second outer insulating cylinder, the first end cover, the second end cover, the first grounding flange and the second grounding flange are connected to form a sealed cavity, the central current-carrying conductor 4-4 is arranged in the sealed cavity, one end of the central current-carrying conductor 4-4 is connected with the first end cover, and the other end of the central current-carrying conductor 4-4 is connected with the second end cover; one end of a high-voltage electrode 1-1 penetrates through the first end cover and is connected with one end of a central current-carrying conductor 4-4, and the other end of the high-voltage electrode 1-1 extends to the outside of the grounding shell body 3-1; end shielding covers 4-2 are arranged at two ends of a central current-carrying conductor 4-4 on the first end cover and the second end cover, an in-sleeve shielding electrode 4-5 is connected to the first grounding flange and the second grounding flange, and the in-sleeve shielding electrode 4-5 is sleeved on the periphery of the central current-carrying conductor 4-4. The ultra/extra-high voltage wall bushing scaling model is a model obtained by simplifying an actual ultra/extra-high voltage wall bushing, is a cheap and small simplified model, and can fill up the defect of reference information of an expensive and large prototype in the design and check links by using physical laws such as lower time cost, economic cost exploration, charge accumulation behavior research and the like.
Referring to fig. 2 and 4, as a preferred embodiment of the present invention, the first grounding flange and the second grounding flange are connected by a screw thread, and a sealing ring is provided at the connection portion. The connection form is simple, convenient and reliable, and is beneficial to improving the experimental efficiency.
As a preferred embodiment of the present invention, referring to fig. 1 (a) -3, a fixed-scale casing support 1-3 is of an annular structure, the fixed-scale casing support 1-3 is sleeved on the peripheries of a first grounding flange and a second grounding flange, and an inner ring of the fixed-scale casing support 1-3 is in clearance fit or interference fit with the outer surface of the first grounding flange and the outer surface of the second grounding flange; the outer ring of the fixed-scale sleeve support piece 1-3 is in contact with or fixedly connected with the inner wall of the grounding shell body 3-1. The fixed-structure scale sleeve support 1-3 can stably support the whole ultra/extra-high voltage wall bushing scale model, can meet the grounding requirement of the ultra/extra-high voltage wall bushing scale model, and has small influence on the charge distribution of the external insulating cylinder.
As a preferred embodiment of the invention, the first outer insulating cylinder is detachably connected with the first end cover in a sealing mode, and the second outer insulating cylinder is detachably connected with the second end cover in a sealing mode. The structure is convenient for assembly and maintenance of the scale model of the ultra/extra-high voltage wall bushing.
Referring to fig. 5, as a preferred embodiment of the present invention, the exterior of the central current carrying conductor 4-4 is coated with an epoxy core 5-1.
As a preferred embodiment of the invention, the inner cavity of the scale model of the ultra/extra-high voltage wall bushing is filled with simulation gas, and the simulation gas adopts SF 6 Gas or N 2 And SF 6 The mixed gas of (1).
As a preferred embodiment of the invention, one end of the grounding shell body 3-1, which is provided with the insulating structure 1-2, is provided with a detachable end face; the structure is convenient for dismounting the scale model of the ultra/extra-high voltage wall bushing;
referring to fig. 1 (a) -3, two ends of the bottom of the grounding shell body 3-1 are respectively provided with a grounding shell fixing piece 1-4, the grounding shell body 3-1 is cylindrical, the grounding shell fixing piece 1-4 is provided with an arc-shaped groove, and the diameter of the arc-shaped groove is the same as that of the grounding shell body 3-1. The entire system can be stably supported by the grounded housing fixtures 1-4.
The invention relates to a working method of a surface charge measuring system of a scale model of an ultra/extra-high voltage wall bushing, which comprises the following steps:
filling simulation gas into an inner cavity of the ultra/extra-high voltage wall bushing scale model in advance, and then installing the ultra/extra-high voltage wall bushing scale model on a fixed scale bushing support member 1-3;
applying a selected voltage to a high-voltage electrode 1-1 of the ultra/extra-high voltage wall bushing scaling model, and continuously applying a voltage for a preset time according to experimental requirements;
and after the voltage pressurization is finished, removing the voltage, grounding the high-voltage electrode 1-1, driving the measurement charge probe to move along the installation hole 3-2 of the measurement charge probe according to the preset requirement through the probe driving mechanism, and acquiring the surface charge of the ultra/extra-high voltage wall bushing shrinkage ratio model on the path by the measurement charge probe in the moving process.
Examples
Referring to fig. 1 (a) -4, the surface charge measurement system of the ultra/extra-high voltage wall bushing scaling model of the embodiment includes a grounded casing body 3-1, a high-voltage electrode 1-1, a charge measurement probe, a fixed scaling bushing support 1-3 and the ultra/extra-high voltage wall bushing scaling model.
The external part of the grounding shell body 3-1 is connected with a programmable stepping motor 3-5 and an electric sliding table 3-4, the grounding shell body 3-1 is provided with a measuring charge probe mounting hole 3-2, the measuring charge probe mounting hole 3-2 is a long hole, the length direction of the long hole is along the axial direction of the grounding shell body 3-1, the bottom of the grounding shell body 3-1 is provided with the grounding shell fixing piece 1-4, the programmable stepping motor 3-5, the electric sliding table 3-4 is provided with a metal shielding plate 3-3, the metal shielding plate 3-3 covers the outer end part of the measuring charge probe mounting hole 3-2, the measuring charge probe is arranged on the metal shielding plate 3-3 and extends into the inner cavity of the grounding shell body 3-1 from the measuring charge probe mounting hole 3-2; before measurement, the metal shielding plate 3-3 is positioned at the leftmost side of the graph 1 (a) and can shield an electric field, during measurement, the programmable stepping motor 3-5 drives the electric sliding table 3-4 to move, and the metal shielding plate 3-3 and the measurement charge probe scan the surface of the outer insulating cylinder 4-3 of the ultra/extra-high voltage wall-penetrating scaling sleeve. The high-voltage electrode 1-1 is fixed on one side of the grounding shell body and is isolated from the grounding shell body 3-1 through the insulating structure 1-2 in voltage. The grounding shell fixing piece 1-4 is used for supporting and fixing the grounding shell body 3-1, an arc-shaped groove matched with the radian of the outer wall of the grounding shell body 3-1 is formed in the upper portion of the grounding shell fixing piece, and the grounding shell body 3-1 is embedded into the arc-shaped groove.
Referring to fig. 1 (a), fig. 1 (b), fig. 2 and fig. 4, the ultra/extra-high voltage wall bushing scaling model of the embodiment is designed and manufactured according to the structure of an actual ultra/extra-high voltage wall bushing, and comprises an end cover 4-1, an end shield 4-2, a bushing inner shield electrode 4-5, a central current-carrying conductor 4-4, a grounding flange left 4-6, a grounding flange right 4-7 and an outer insulating cylinder 4-3. The end part shielding cover 4-2 is positioned at the end cover 4-1 of the scaling sleeve, the end part shielding cover and the end cover are fixedly connected, the shielding electrode 4-5 in the sleeve is positioned at the joint of the left grounding flange and the right grounding flange, and the shielding electrode 4-5 in the sleeve is fixedly connected with the left grounding flange and the right grounding flange. Two ends of the outer insulating cylinder 4-3 are respectively connected with the end cover 4-1 and the grounding flange and fixed. The left 4-6 of the grounding flange and the right 4-7 of the grounding flange are fixedly connected through threads. The central current-carrying conductor 4-4 is positioned on the axis of the whole sleeve scaling model, and two ends of the central current-carrying conductor 4-4 are connected and fixed with the end covers 4-1 at the two ends. The whole ultra/extra-high voltage wall bushing scaling model is sealed through the end sealing ring.
Referring to fig. 1 (a) and 1 (b), a grounding shell body 3-1, a high-voltage electrode 1-1, an ultra/extra-high voltage wall bushing scaling model and a fixed scaling bushing support 1-3 are coaxially arranged, the fixed scaling bushing support 1-3, a grounding flange and the inner wall of the grounding shell body are fixedly contacted, and a scaling bushing (namely, the ultra/extra-high voltage wall bushing scaling model) is fixedly supported. One end of the high-voltage electrode 1-1 is connected with an end cover 4-1 of the scale model of the ultra/extra-high voltage wall bushing, and the scanning path of the charge probe is along the axis of the scale bushing. Referring to FIG. 4, the scaled casing may be filled with different gases to simulate different gas-insulated structures, including but not limited to pure SF 6 Gas, N 2 -SF 6 And (4) mixing the gases. Pure SF is filled in the scaling sleeve 6 A gas. The super/extra-high voltage wall bushing scaling model comprises two structures: epoxy core-SF 6 Composite insulation structure and pure SF 6 A gas-insulated structure. According to different insulation structures, the sleeve structure can be divided into an epoxy core 5-1 and an epoxy core which is not included, and the epoxy core is installed and fixed on the central current-carrying conductor 4-4.
The working method of the surface charge measuring system of the ultra/extra-high voltage wall bushing scaling model comprises the following steps according to a specific embodiment:
the inner cavity of the scaling sleeve is pre-filled with required gas SF 6 And then fixedly mounted on the scaled casing support.
According to the arrangement shown in the figure 1 (a) and the figure 1 (b), the grounding shell body, the high-voltage electrode 1-1 and the scaling sleeve are coaxially arranged, the high-voltage electrode 1-1 is installed and fixed, one end of the high-voltage electrode 1-1 is in contact with one end cover 4-1 of the scaling sleeve, and the other end of the high-voltage electrode is connected with a high-voltage power supply to provide high voltage for the scaling sleeve.
The grounded housing is grounded and the measurement charge probe is mounted in place. The metallic shielding plate 3-3 should be located at the leftmost side of fig. 1 (a) at this time for shielding the electric field. And editing a motion program of the programmable stepping motor 3-5.
A high-voltage power supply is used for applying selected voltage to the high-voltage electrode 1-1, and direct-current voltage with a certain duration is continuously applied according to experimental requirements.
After the high-voltage pressurization is finished, the voltage is removed, the high-voltage electrode 1-1 is grounded, at the moment, the programmable stepping motor 3-5 drives the electric sliding table 3-4 to work, the metal shielding plate 3-3 and the charge measuring probe are driven to move according to a set program, and the charge measuring probe can collect surface charges of the outer insulating cylinder 4-3 of the path shrinkage ratio sleeve. Referring to fig. 6, the collected data can be transmitted to a computer through an analog-to-digital (A/D) conversion device, the computer can store and process the data for analysis, and the obtained related data can provide theoretical basis for structure optimization design, service life evaluation and fault analysis of the wall bushing.
Claims (9)
1. A surface charge measurement system of an ultra/extra-high voltage wall bushing scale model is characterized by comprising a grounding shell body (3-1), a charge measurement probe, a metal shielding plate (3-3), a probe driving mechanism and an ultra/extra-high voltage wall bushing scale model;
the ultra/extra-high voltage wall bushing scaling model is coaxially arranged in the inner cavity of the grounding shell body (3-1), and is fixed in the inner cavity of the grounding shell body (3-1) through a fixed scaling bushing support piece (1-3); the fixed-scale sleeve supporting piece (1-3) adopts a conductor, one end of the fixed-scale sleeve supporting piece (1-3) is in contact with a grounding flange on the ultra/extra-high voltage wall bushing scale model, and one end of the fixed-scale sleeve supporting piece (1-3) is connected with the grounding shell body (3-1);
one end of the grounding shell body (3-1) is provided with an insulation structure (1-2), and a high-voltage electrode (1-1) of the ultra/extra-high voltage wall bushing scaling model is isolated from the grounding shell body (3-1) through the insulation structure (1-2);
a measuring charge probe mounting hole (3-2) is formed in the wall surface of the grounding shell body (3-1), the measuring charge probe mounting hole (3-2) is a long hole, the length direction of the long hole is arranged along the axial direction of the grounding shell body (3-1), the metal shielding plate (3-3) is covered at the outer end of the measuring charge probe mounting hole (3-2), and the measuring charge probe is arranged on the metal shielding plate (3-3) and extends into the inner cavity of the grounding shell body (3-1) through the measuring charge probe mounting hole (3-2);
the probe driving mechanism is connected with the metal shielding plate (3-3) and can drive the metal shielding plate (3-3) to move along the axial direction of the grounding shell body (3-1);
the ultra/extra-high voltage wall bushing scaling model comprises a first outer insulation cylinder, a second outer insulation cylinder, a central current-carrying conductor (4-4) and a high-voltage electrode (1-1), wherein one end of the first outer insulation cylinder is hermetically connected with a first end cover, and the other end of the first outer insulation cylinder is provided with a first grounding flange; one end of the second external insulation cylinder is hermetically connected with a second end cover, and the other end of the first external insulation cylinder is provided with a second grounding flange;
the first grounding flange is connected with the second grounding flange in a sealing mode, the first outer insulating cylinder and the second outer insulating cylinder are coaxial, the first outer insulating cylinder, the second outer insulating cylinder, the first end cover, the second end cover, the first grounding flange and the second grounding flange are connected to form a sealed cavity, the central current-carrying conductor (4-4) is arranged in the sealed cavity, one end of the central current-carrying conductor (4-4) is connected with the first end cover, and the other end of the central current-carrying conductor (4-4) is connected with the second end cover;
one end of the high-voltage electrode (1-1) penetrates through the first end cover and is connected with one end of the central current-carrying conductor (4-4), and the other end of the high-voltage electrode (1-1) extends to the outside of the grounding shell body (3-1);
end shielding covers (4-2) are arranged at two ends of the central current-carrying conductor (4-4) on the first end cover and the second end cover, sleeve inner shielding electrodes (4-5) are connected to the first grounding flange and the second grounding flange, and the sleeve inner shielding electrodes (4-5) are sleeved on the periphery of the central current-carrying conductor (4-4).
2. The surface charge measurement system of the scale model of the ultra/extra-high voltage wall bushing according to claim 1, wherein the probe driving mechanism comprises a programmable stepping motor (3-5) and an electric sliding table (3-4), the programmable stepping motor (3-5) is connected with the electric sliding table (3-4), and the metal shielding plate (3-3) is arranged on the electric sliding table (3-4).
3. The system for measuring the surface charge of the scale model of the ultra/extra-high voltage wall bushing according to claim 1, wherein the first grounding flange and the second grounding flange are connected through threads, and a sealing ring is arranged at the connecting part.
4. The surface charge measurement system of the ultra/extra-high voltage wall bushing scaling model according to claim 3, characterized in that a fixed scaling bushing support member (1-3) is of an annular structure, the fixed scaling bushing support member (1-3) is sleeved on the peripheries of the first grounding flange and the second grounding flange, and the inner ring of the fixed scaling bushing support member (1-3) is in clearance fit or interference fit with the outer surface of the first grounding flange and the outer surface of the second grounding flange; the outer ring of the fixed-scale sleeve support piece (1-3) is in contact with or fixedly connected with the inner wall of the grounding shell body (3-1).
5. The system for measuring the surface charge of the scale model of the ultra/extra-high voltage wall bushing according to claim 1, wherein the first outer insulating cylinder is detachably connected with the first end cover in a sealing manner, and the second outer insulating cylinder is detachably connected with the second end cover in a sealing manner.
6. The surface charge measurement system of the scale model of the ultra/extra-high voltage wall bushing according to claim 1, characterized in that the outside of the central current-carrying conductor (4-4) is coated with an epoxy core (5-1).
7. The system for measuring the surface charge of the ultra/extra-high voltage wall bushing scaling model according to claim 1, wherein the inner cavity of the ultra/extra-high voltage wall bushing scaling model is filled with simulation gas, and the simulation gasThe body adopts SF 6 Gas or N 2 And SF 6 The mixed gas of (2).
8. The surface charge measurement system of the scale model of the ultra/extra-high voltage wall bushing according to claim 1, wherein one end of the grounding shell body (3-1) provided with the insulation structure (1-2) is a detachable end face;
the two ends of the bottom of the grounding shell body (3-1) are respectively provided with a grounding shell fixing part (1-4), the grounding shell body (3-1) is cylindrical, an arc-shaped groove is formed in the grounding shell fixing part (1-4), and the diameter of the arc-shaped groove is the same as that of the grounding shell body (3-1).
9. The working method of the surface charge measuring system of the ultra/extra-high voltage wall bushing scaling model according to any one of claims 1 to 8, characterized by comprising the following steps:
filling simulation gas into an inner cavity of the ultra/extra-high voltage wall bushing scale model in advance, and then installing the ultra/extra-high voltage wall bushing scale model on a fixed scale bushing support member (1-3);
applying a selected voltage to a high-voltage electrode (1-1) of the ultra/extra-high voltage wall bushing scaling model, and continuously applying a voltage for a preset time according to experimental requirements; the grounding shell body is grounded;
and after the voltage pressurization is finished, removing the voltage, grounding the high-voltage electrode (1-1), driving the measurement charge probe to move along the measurement charge probe mounting hole (3-2) according to a preset requirement through the probe driving mechanism, and collecting the surface charge of the ultra/extra-high voltage wall bushing scaling model on the path by the measurement charge probe in the moving process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111520095.6A CN114236253B (en) | 2021-12-13 | 2021-12-13 | Surface charge measurement system of super/extra-high voltage wall bushing scaling model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111520095.6A CN114236253B (en) | 2021-12-13 | 2021-12-13 | Surface charge measurement system of super/extra-high voltage wall bushing scaling model |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114236253A CN114236253A (en) | 2022-03-25 |
| CN114236253B true CN114236253B (en) | 2022-10-25 |
Family
ID=80755283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111520095.6A Active CN114236253B (en) | 2021-12-13 | 2021-12-13 | Surface charge measurement system of super/extra-high voltage wall bushing scaling model |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114236253B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738714A (en) * | 2016-04-05 | 2016-07-06 | 国网重庆市电力公司电力科学研究院 | Deduction method and device of space charge distribution of transformer major insulation system |
| CN106485995A (en) * | 2016-11-17 | 2017-03-08 | 南方电网科学研究院有限责任公司 | Sleeve pipe molds, methods of making and system |
| CN207380146U (en) * | 2017-11-10 | 2018-05-18 | 云南省送变电工程公司 | A kind of transformer bushing CT test electrode |
| CN108152607A (en) * | 2017-12-28 | 2018-06-12 | 中国电力科学研究院有限公司 | Insulating sleeve surface charge measuring device and system |
| CN110308340A (en) * | 2019-05-08 | 2019-10-08 | 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 | A kind of direct-current wall bushing failure simulation device and method |
| CN111381186A (en) * | 2020-03-25 | 2020-07-07 | 国家电网有限公司 | Test device for simulating different grounding states of high-voltage bushing tap |
| CN211698057U (en) * | 2020-01-23 | 2020-10-16 | 传奇电气（沈阳）有限公司 | Test voltage applying device for oil-gas casing pipe |
| CN113219264A (en) * | 2021-05-28 | 2021-08-06 | 清华大学 | On-site measuring device and method for surface charge of high-voltage direct-current sleeve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016089861A1 (en) * | 2014-12-01 | 2016-06-09 | Watson Joe David | Active monitoring systems for high voltage bushings and methods related thereto |
-
2021
- 2021-12-13 CN CN202111520095.6A patent/CN114236253B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738714A (en) * | 2016-04-05 | 2016-07-06 | 国网重庆市电力公司电力科学研究院 | Deduction method and device of space charge distribution of transformer major insulation system |
| CN106485995A (en) * | 2016-11-17 | 2017-03-08 | 南方电网科学研究院有限责任公司 | Sleeve pipe molds, methods of making and system |
| CN207380146U (en) * | 2017-11-10 | 2018-05-18 | 云南省送变电工程公司 | A kind of transformer bushing CT test electrode |
| CN108152607A (en) * | 2017-12-28 | 2018-06-12 | 中国电力科学研究院有限公司 | Insulating sleeve surface charge measuring device and system |
| CN110308340A (en) * | 2019-05-08 | 2019-10-08 | 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 | A kind of direct-current wall bushing failure simulation device and method |
| CN211698057U (en) * | 2020-01-23 | 2020-10-16 | 传奇电气（沈阳）有限公司 | Test voltage applying device for oil-gas casing pipe |
| CN111381186A (en) * | 2020-03-25 | 2020-07-07 | 国家电网有限公司 | Test device for simulating different grounding states of high-voltage bushing tap |
| CN113219264A (en) * | 2021-05-28 | 2021-08-06 | 清华大学 | On-site measuring device and method for surface charge of high-voltage direct-current sleeve |
Non-Patent Citations (2)
| Title |
|---|
| Simulation analysis and calculation of electric field distribution characteristics of UHV wall bushing;Yunfei Shi et al.;《Energy Reports》;20211125;110-117 * |
| 有限元数值计算技术应用于特高压穿墙套管三维电场模拟分析;张施令等;《高电压技术》;20200330(第03期);51-58 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114236253A (en) | 2022-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102565636B (en) | Ultrahigh-voltage oil-SF6 sleeve test device | |
| CN106848964B (en) | A kind of 35kV all insulation enclosed busbar | |
| CN106093723B (en) | DC Insulator insulation test device and method | |
| CN114236253B (en) | Surface charge measurement system of super/extra-high voltage wall bushing scaling model | |
| CN106324457B (en) | Withstand voltage testing device for insulating part | |
| CN109696604A (en) | A kind of concentric cylinder SF6Breakdown voltage experimental provision | |
| CN201868314U (en) | Three-station isolating/grounding switch, series high-voltage switch combined electrical equipment and gas-insulated metal-enclosed power transmission line | |
| CA1252837A (en) | Modularly constructed gas-insulated transmission line, and method of assembling same | |
| CN107991585A (en) | A kind of disc insulator Withstand test device | |
| CN218037035U (en) | Airborne non-contact electricity testing device | |
| CN218997126U (en) | Electric connection assembly for withstand voltage test tool and withstand voltage test tool | |
| CN202171994U (en) | Temporary hoisting seat for transformer | |
| CN111337760B (en) | Insulator surface charge measurement system and mounting rack thereof | |
| CN217521298U (en) | Partial discharge measuring equipment and device of GIS insulating pull rod | |
| CN202167785U (en) | 126kV cabinet-type gas-insulated metal-enclosed switch device | |
| CN115542095A (en) | GIS basin-type insulator surface charge measuring device and method | |
| RU2616589C2 (en) | Male and female isolated with clean gas wall bushings for dc high voltage and very high voltage | |
| CN211698057U (en) | Test voltage applying device for oil-gas casing pipe | |
| US3746935A (en) | Electrical bushing suitable for attachment between two electrical apparatus enclosures | |
| CN106054044A (en) | Insulation test device for gas filled tank | |
| CN117538712B (en) | Discharge type and position switching device and discharge model | |
| CN115718053B (en) | Particle discharge experiment platform foreign matter release device and GIL test system | |
| CN215526003U (en) | Test device for power cable accessory | |
| JPS6247562A (en) | Testing method of both end apparatus direct-coupled cable line | |
| CN217689249U (en) | Insulating frock in test sleeve |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |