CN115547654B - 10kV current transformer of insulator type low partial discharge high-voltage lead shielding module - Google Patents
10kV current transformer of insulator type low partial discharge high-voltage lead shielding module Download PDFInfo
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- CN115547654B CN115547654B CN202210982469.4A CN202210982469A CN115547654B CN 115547654 B CN115547654 B CN 115547654B CN 202210982469 A CN202210982469 A CN 202210982469A CN 115547654 B CN115547654 B CN 115547654B
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- insulator
- shielding
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- 239000012212 insulator Substances 0.000 title claims abstract description 55
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 93
- 229910052802 copper Inorganic materials 0.000 claims abstract description 92
- 239000010949 copper Substances 0.000 claims abstract description 92
- 239000002184 metal Substances 0.000 claims abstract description 46
- 229910052751 metal Inorganic materials 0.000 claims abstract description 46
- 238000004804 winding Methods 0.000 claims abstract description 43
- 239000003822 epoxy resin Substances 0.000 claims abstract description 31
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 31
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000009434 installation Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract 1
- 239000004593 Epoxy Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000005684 electric field Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
- H01F27/2828—Construction of conductive connections, of leads
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
The invention relates to the field of current transformers, and discloses an insulator type low partial discharge high-voltage lead shielding module 10kV current transformer, which comprises: the 10kV current transformer of the insulator type low partial discharge high-voltage lead shielding module comprises an installation box body and an insulator, wherein the insulator is connected with the installation box body, and epoxy resin is filled in the insulator and is formed by mixing, stirring, pouring and solidifying the epoxy resin; the high potential assembly at least comprises a high voltage lead wire connected with the primary winding and a high voltage lead wire outgoing line; the insulator is internally provided with an installation embedded nut, the installation embedded nut is used for fastening a bracket bolt, and the bracket bolt is fixedly connected with the installation box body; a low-potential metal piece is arranged between the mounting embedded mother and the high-voltage lead, and a low-potential shielding copper net is arranged on the low-potential metal piece and used for reducing the discharge amount of the mounting box body and the mounting embedded mother on the high-voltage lead or the high-voltage lead outgoing line; the invention has convenient installation, effectively combines the current transformer and the insulator into a whole, has large support insulation creepage distance and high dynamic heat stability.
Description
Technical Field
The invention belongs to the field of current transformers, and particularly relates to an insulator type 10kV current transformer with low partial discharge and high voltage lead shielding modules.
Background
The current transformer converts primary side large current into secondary side small current according to electromagnetic induction principle, so as to facilitate measurement, protection and use. The current transformer generally comprises a primary winding and a secondary winding, wherein the primary winding has a small number of turns and large current, the secondary winding has a large number of turns and small current, and the small current is used as output for measurement, protection and use.
The existing current transformer has the defects of uneven electric fields of different electrodes, uneven uniformity (such as gaps, pores, microcracks and the like) of the epoxy resin in the pouring process and short creepage distance of the surface extension surface, so that the local discharge capacity of the product is large, and particularly the defect of the epoxy resin at the grounding and low level is more likely to cause the local discharge capacity to be large, thereby severely limiting the application of the high-voltage current transformer.
Therefore, in view of the above situation, there is an urgent need to provide an insulator type low partial discharge high voltage lead shielding module 10kV current transformer, so as to overcome the shortfall in the current practical application.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention provides an insulator type low partial discharge high-voltage lead shielding module current transformer which is specially used for a high-voltage current transformer, particularly a 10kV current transformer, so as to solve the problems in the technical background.
In order to achieve the above purpose, the present invention provides the following technical solutions: an insulator low partial discharge high voltage lead wire shielding module 10kV current transformer, the insulator low partial discharge high voltage lead wire shielding module kV current transformer includes:
the utility model provides an insulator low partial discharge high voltage lead wire shielding module 10kV current transformer, includes installation box and insulator, the insulator with the installation box is connected, its characterized in that:
the epoxy resin is filled in the insulator and is formed by mixing, stirring, pouring and solidifying the epoxy resin;
the high potential assembly at least comprises a high voltage lead wire connected with the primary winding and a high voltage lead wire outgoing line;
the insulator is internally provided with an installation embedded nut, the installation embedded nut is used for fastening a bracket bolt, and the bracket bolt is fixedly connected with the installation box body;
the low-potential metal piece is arranged between the mounting embedded bus and the high-voltage lead, and a low-potential shielding copper net is arranged on the low-potential metal piece and used for reducing the discharge amount of the mounting box body and the mounting embedded bus to the high-voltage lead or the high-voltage lead outgoing line.
Further, the high-potential component comprises a high-voltage current guide bar, a high-voltage lead and a high-voltage lead outgoing line, wherein an inlet part of the high-voltage current guide bar and the high-voltage lead outgoing line are both arranged in an insulator, the inlet part of the high-voltage current guide bar 1 entering the current transformer is wrapped with a high-voltage shield, and the high-voltage lead is wrapped with the high-voltage lead shield; and the low-potential component comprises a coil bracket, a secondary wire, a winding lead and a secondary wiring bolt, wherein the coil bracket, the secondary wire, the winding lead and the secondary wiring bolt are arranged on the insulator, the secondary wire is wrapped with a secondary coil shield, the winding lead is wrapped with a winding lead shield, the surface of a copper wire mesh is provided with a modification layer, and the wettability of materials of the low-potential shielding copper mesh and the extension copper mesh and epoxy resin materials is improved.
Further, the coil bracket is connected with a bracket embedded nut, the bracket embedded nut is connected with a bracket fixing screw for fixing the secondary coil shielding, and the mounting bolt is also connected with an equipotential connecting wire and is electrically connected with the bracket fixing screw through the equipotential connecting wire.
Further, the high-voltage lead outgoing line is connected with the high-voltage lead through a connecting piece, and the connecting piece comprises a high-voltage lead embedded nut and a high-voltage lead screw.
Further, the low-potential shielding copper mesh adopts a copper mesh with a larger curvature radius.
Further, the low potential metalwork is the metalwork that independently sets up, the installation inlay female with the support inlays female periphery survey all to wrap up metal copper net and follow the copper net orientation the extension copper net that low potential shielding copper net one side was extended, the extension copper net parcel on the installation inlay female connects the bracing rod, the extension copper net parcel on the support inlays the female winding lead wire shielding on the same level.
Further, the low-potential metal piece is a winding lead, a notch is formed in one side of the winding lead, corresponding to the low-potential shielding copper net, and the winding lead is electrically connected with the low-potential shielding copper net through the notch.
Further, in a cross section from the top down, the low potential shielding copper mesh is in a circular ring shape.
Further, the lower end of the low-potential shielding copper net covers the upper end of the high-voltage lead embedding nut, the low-potential metal piece and the winding lead are vertically arranged, one end of the low-potential metal piece is fixedly connected with one end side of the low-potential shielding copper net, and the other side of the low-potential metal piece is electrically connected with the mounting embedding nut through a supporting rod.
Further, the mounting embedded mother is connected with the low-potential shielding copper net through a connecting support rod; and welding is performed between the connecting support rod and the mounting embedded nut and between the connecting support rod and the low-potential shielding copper net.
Further, the epoxy resin is cast into the insulator under a full vacuum environment.
Further, the high-voltage shield, the secondary coil shield, the winding lead shield and the high-voltage lead shield are all formed by wrapping a semiconductor paper tape.
Compared with the prior art, the invention has the beneficial effects that:
high potential: the 10kV voltage high current enters the main body of the current transformer from the high-voltage current guide bar, the entering part is covered with a high-voltage shield, and the high-voltage lead wire semiconductor paper-covered shield, the high-voltage lead wire embedding nut, the high-voltage lead wire screw and the high-voltage lead wire are covered with the high-voltage shield; high voltage enters from the upper end of the insulator to the lower end of the insulator and is led into the installation box body (place position);
low potential: secondary current of the current transformer is led into the installation box body by the secondary coil shielding, the coil secondary winding lead shielding and the secondary wiring bolt; the wire bag bracket connecting bracket is fixedly connected with the wire bag by a bracket fixing screw when the die is assembled, and meanwhile, the equipotential connecting wire is connected with a bracket bolt which is fastened in the mounting embedding nut in the insulator and is fixed with the mounting box body; in order to reduce the discharge amount of the box body and the insulator fixed embedded bus to the high potential (high voltage lead), a low potential shielding copper net is added on the low potential metal part to improve the shielding effect, and the copper net has good conductivity and is convenient for the epoxy resin (main insulating medium) to flow; welding the mounting embedded mother and the low-potential shielding net by using a connecting support rod; more importantly, the introduction of the low-potential metal piece enables the low-potential shielding net to be limited vertically, the area of the low-potential shielding net is increased while the resistance is reduced, the lower end of the low-potential shielding net is matched to cover the upper end of the high-voltage lead embedding mother, the low-potential metal piece and the winding lead are all arranged vertically, one end of the low-potential metal piece is fixedly connected with one end side of the low-potential shielding copper net, the other side of the low-potential metal piece is electrically connected with the mounting embedding mother through the supporting rod, the low-potential metal piece is matched with the metal piece which is arranged independently, the mounting embedding mother and the periphery of the mounting embedding mother are both wrapped with the metal copper net and the extending copper net extending from the copper net towards one side of the low-potential shielding copper net, the extending copper net on the mounting embedding mother is wrapped with the winding lead shielding on the same horizontal height, the whole low-potential assembly is electrically connected into a net shape, the electric field can be uniformly matched with the electrode, and the mounting embedding mother is enabled to be better than the epoxy resin, the epoxy resin is more compact, and the electric quantity of the epoxy resin is reduced to the largest extent in view of the fact that the epoxy resin is fused with the high-density leads. And through the cooperation setting of high-voltage lead embedding female and high-voltage lead screw, easy to assemble.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
In the drawings:
fig. 1 is a schematic diagram of a front view structure according to an embodiment of the present invention.
FIG. 2 is a schematic side cross-sectional view of an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of the structure at A-A in fig. 1.
In the figure: 1-high voltage current conducting bar, 2-high voltage shielding, 3-epoxy resin, 4-secondary coil shielding, 5-mounting box, 6-bracket fixing screw, 7-bracket embedding mother, 8-low potential shielding copper net, 9-winding lead shielding, 10-high voltage lead shielding, 11-mounting embedding mother, 12-mounting bolt, 13-high voltage lead embedding mother, 14-high voltage lead screw, 15-high voltage lead outgoing line, 16-secondary wiring bolt, 17-equipotential connection line, 18-insulator, 19-coil bracket and 20-connection support rod.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 3, an embodiment of the present invention provides an insulator low partial discharge high voltage lead shielding module 10KV current transformer, where the insulator low partial discharge high voltage lead shielding module 10KV current transformer includes:
the device comprises a mounting box body 5 and an insulator 18, wherein the insulator 18 is connected with the mounting box body 5; the insulator is provided with a concave-convex surface on the outer side so as to improve the heat dissipation effect and provide a protection function;
the epoxy resin 3 is filled in the insulator 18, and is formed by mixing, stirring, pouring and solidifying the epoxy resin 3;
the high potential assembly at least comprises a high voltage lead wire connected with the primary winding and a high voltage lead wire outgoing line;
a mounting embedded nut 11 is arranged in the insulator 18, the mounting embedded nut 11 is used for fastening a bracket bolt 12, and the bracket bolt 12 is fixedly connected with the mounting box body 5;
a low-potential metal part is arranged between the mounting embedded mother 11 and the high-voltage lead 10, and a low-potential shielding copper net is arranged on the low-potential metal part and used for reducing the discharge amount of the mounting box body 5 and the mounting embedded mother 11 on the high-voltage lead or the high-voltage lead outgoing line. Meanwhile, through mixing stirring and pouring, the invention can realize uniform pouring with the subsequent low-potential shielding copper net to the greatest extent, and in view of better fluidity, better solidification and fusion of the epoxy resin caused by the copper net, the epoxy resin filling with better compactness can be formed near the low-potential metal part, the low-potential metal part and the vicinity thereof are areas with high discharge amount with the high-voltage lead, and due to the irregular arrangement of the corresponding embedded bus, the corresponding epoxy resin at the areas has defects such as pores, and the like. Further, an epoxy resin material with good wettability with the copper mesh is selected, and the surface of the copper mesh is modified to further improve the wettability with the epoxy resin, so that the mesh of the copper mesh can better promote flow, and meanwhile, the epoxy resin can be better fixed before solidification and fusion, the compactness and stability of the epoxy resin in the mesh of the copper mesh and nearby are improved, and the discharge capacity is reduced.
Further, the high-potential component comprises a high-voltage current guide bar 1, a high-voltage lead wire and a high-voltage lead wire outgoing line 15, wherein an inlet part of the high-voltage current guide bar 1 and the high-voltage lead wire outgoing line 15 are all arranged in an insulator 18, the inlet part of the high-voltage current guide bar 1 entering the current transformer is wrapped with a high-voltage shield 2, and the high-voltage lead wire is wrapped with a high-voltage lead wire shield 10; and a low potential component including a coil holder 19 mounted on the insulator 18, a secondary wire wrapped with a secondary coil shield 4, a winding lead wrapped with a winding lead shield 9, and a secondary wire connection bolt 16; through the setting of above-mentioned shielding, reduced the discharge volume, and easily install through the setting of bolt.
Further, the coil support 19 is connected with a support embedding nut 7, the support embedding nut 7 is connected with a support fixing screw 6 for fixing the secondary coil shielding 4, the mounting bolt 12 is also connected with an equipotential connecting wire 17, and the equipotential connecting wire 17 is electrically connected with the support fixing screw 6, so that the coil support, the support embedding nut, the secondary coil shielding and the support fixing screw are in the same level, and a copper net with low resistance is matched, so that a uniform electric field is formed, and the discharge amount between the coil support and a high-voltage lead wire is reduced to the greatest extent.
Further, the high voltage lead out wire 15 is connected with the high voltage lead through a connector including a high voltage lead insert 13 and a high voltage lead screw 14, thereby realizing high voltage introduction.
Further, the low-potential shielding copper mesh adopts a copper mesh with a larger curvature radius, so that the copper mesh can realize a more uniform electric field, and the flow and solidification fusion of epoxy resin are better promoted.
Further, the low-potential metal piece is an independently arranged metal piece, the periphery of the mounting embedded mother 11 and the periphery of the bracket embedded mother 7 are respectively wrapped with a metal copper net and an extension copper net extending from the copper net towards one side of the low-potential shielding copper net, the extension copper net on the mounting embedded mother 11 is wrapped with a connecting support rod 20, and the extension copper net on the bracket embedded mother 7 is wrapped with a winding lead shielding 9 on the same horizontal height; through above-mentioned setting for form the metallic copper net of better shielding in easy discharge's position, reduced the discharge, simultaneously through the copper net that extends with support bar 20 and winding lead wire shielding, make can form the low level of waiting, reduce the discharge, simultaneously through improving the wettability of copper net make epoxy easily flow to the installation inlay female 11 with support inlay female etc. irregularity and mounted position, make these easy discharge's positions form better epoxy and compactness, further reduce the discharge.
Further, the low-potential metal piece is a part of a winding lead, a notch is formed in one side of the winding lead corresponding to the low-potential shielding copper net, the winding lead is electrically connected with the low-potential shielding copper net through the notch, but the low-potential metal piece is preferably an independent metal piece, stability of the copper net can be improved through the arranged low-level metal, and high-conductivity resistance is connected in parallel to the copper net, so that the low-potential shielding copper net is beneficial to realization of equal level.
Further, on the cross section from the top down, the low potential shielding copper net 8 is circular, so that the equal level can be realized at all positions of the ring, meanwhile, the resistance is reduced, the connection with the extension copper net of the copper net arranged at each easy discharge position is easy, and the discharge capacity is reduced to the greatest extent.
Further, a certain distance exists between the lower end of the low-potential shielding copper net 8 and the upper end of the high-voltage lead embedding mother 13, the low-potential metal piece and the winding lead are vertically arranged, one end of the low-potential metal piece is fixedly connected with one end side of the low-potential shielding copper net 8, and the other side of the low-potential metal piece is electrically connected with the mounting embedding mother 11 through a supporting rod 20; therefore, a proper distance between the high-voltage lead and the low potential can be ensured, abnormal discharge is avoided, meanwhile, the copper mesh is fixed by the low-potential metal part, the resistance is reduced, the fluidity of the epoxy resin is promoted, and the densification effect and the filling effect are improved.
Further, the mounting embedded mother 11 is connected with the low-potential shielding copper net 8 through a connecting support rod 20; the welding is adopted between the connecting support rod 20 and the mounting embedded nut 11 and between the connecting support rod 20 and the low-potential shielding copper net 8, and through the arrangement, a low-level fixed network is formed, and the discharge capacity is reduced.
Further, the epoxy resin 3 is poured into the insulator 18 in a full vacuum environment, impurities and pores are reduced by vacuum pouring, and the filling effect is improved by matching with the copper mesh arrangement.
Further, the high-voltage shield 2, the secondary coil shield 4, the winding lead shield 9 and the high-voltage lead shield 10 are all formed by wrapping a semiconductor paper tape, so that the shielding effect is improved, and the discharge quantity is reduced.
The working principle of the invention is as follows:
high potential: the large current with the voltage of 10kV enters the main body of the current transformer from the high-voltage current guide bar 1, the entering part is wrapped with the high-voltage shield 2, at the same time, the high-voltage lead shielding 10, the high-voltage lead embedded mother 13, the high-voltage lead screw 14 and the high-voltage lead wire 15 are adopted; high voltage enters the lower end of the insulator 18 from the upper end and is introduced into the mounting box body 5 (ground position);
low potential: the secondary current of the current transformer is led into the mounting box body 5 by the secondary coil shield 4, the coil secondary winding lead shield 9 and the secondary wiring bolt 16; the wire bag bracket 19 is connected with the bracket embedding nut 7, the wire bag 4 is fixed by the bracket fixing screw 6 when the die is assembled, meanwhile, the equipotential connecting wire 17 is connected with the bracket bolt 12, and the bracket bolt 12 is fastened in the mounting embedding nut 11 in the insulator and is fixed with the mounting box body 5; in order to reduce the discharge amount of the box body 5 and the insulator fixing embedded mother 11 to the high potential space (high voltage lead), a low potential shielding copper net 8 is added on the low potential metal part, the copper net has good conductivity and is convenient for the epoxy resin 3 (main insulating medium) to flow; and a connecting support rod 20 is used for welding between the mounting embedded mother 11 and the low-potential shielding net.
It is emphasized that the introduction of low potential metal piece makes low potential shielding net spacing on vertical, improves the area of low potential shielding net when reducing resistance, cooperates simultaneously low potential shielding copper net lower extreme covers the upper end of high voltage lead inlays the mother, low potential metal piece with winding lead wire is vertical setting, low potential metal piece's one end and low potential shielding copper net's one end side fixed connection, low potential metal piece's opposite side is through supporting rod and the embedded female electricity of installation, and cooperates low potential metal piece is the metal piece that independently sets up, the installation inlay female with the support inlays the periphery survey of female and all wraps up metal copper net and follow the copper net orientation low potential shielding copper net one side extends extend copper net, extend copper net parcel on the embedded female and connect the supporting rod, the support inlays the winding lead wire shielding on the same level of copper net parcel for whole low potential subassembly electricity is connected into, can realize that the electric field is even, cooperates simultaneously and sets up and makes to inlay the setting up and inlay female and inlay the copper net, has made to seal with the high-level epoxy and have improved the solidification of epoxy between the high-phase and high-voltage epoxy and the wire and the other high-level and the maximum degree of fluidity and has reduced the electric quantity and has promoted and the solidification of these phase-of epoxy leads. And through the cooperation setting of high-voltage lead embedding female and high-voltage lead screw, easy to assemble.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an insulator low partial discharge high voltage lead wire shielding module 10kV current transformer, includes installation box (5) and insulator (18), insulator (18) with installation box (5) are connected, its characterized in that:
the epoxy resin (3) is filled in the insulator (18), and is formed by mixing, stirring, pouring and solidifying the epoxy resin;
the high potential assembly at least comprises a high voltage lead wire connected with the primary winding and a high voltage lead wire outgoing line;
a mounting embedded nut (11) is arranged in the insulator (18), the mounting embedded nut (11) is used for fastening a mounting bolt (12), and the mounting bolt (12) is fixedly connected with the mounting box body (5);
a low-potential metal part is arranged between the mounting embedded mother (11) and the high-voltage lead (10), and a low-potential shielding copper net is arranged on the low-potential metal part and is used for reducing the discharge amount of the mounting box body (5) and the mounting embedded mother (11) on the high-voltage lead or the high-voltage lead outgoing line;
the low-potential assembly comprises a coil bracket (19) mounted on the insulator (18), a secondary wire, a winding lead and a secondary wiring bolt (16), wherein the secondary wire is wrapped with a secondary coil shield (4), and the winding lead is wrapped with a winding lead shield (9);
the coil bracket (19) is connected with a bracket embedded female (7), the bracket embedded female (7) is connected with a bracket fixing screw (6) for fixing the secondary coil shielding (4), the mounting bolt (12) is also connected with an equipotential connecting wire (17), and the bracket fixing screw (6) is electrically connected through the equipotential connecting wire (17);
the low-potential metal piece is an independently arranged metal piece, a metal copper net and an extension copper net extending from the copper net towards one side of the low-potential shielding copper net are wrapped on the periphery of the mounting embedded mother (11) and the periphery of the bracket embedded mother (7), the extension copper net on the mounting embedded mother (11) wraps the connection support rod (20), and the extension copper net on the bracket embedded mother (7) wraps the winding lead shielding (9) on the same horizontal height;
the low-potential metal piece is a winding lead, a notch is arranged on one side of the winding lead corresponding to the low-potential shielding copper net, and the winding lead is electrically connected with the low-potential shielding copper net through the notch.
2. The insulator low partial discharge high voltage lead shielding module 10kV current transformer of claim 1, wherein the high potential component comprises a high voltage current lead (1), a high voltage lead, and a high voltage lead outgoing line (15), the entry portion of the high voltage current lead (1) and the high voltage lead outgoing line (15) are both installed in an insulator (18), the entry portion of the high voltage current lead (1) into the current transformer is wrapped with a high voltage shield (2), the high voltage lead is wrapped with a high voltage lead shield (10);
the copper mesh surface is provided with a modification layer, so that the wettability of the materials of the low-potential shielding copper mesh and the extension copper mesh with the epoxy resin material is improved.
3. The insulator low partial discharge high voltage lead shield module 10kV current transformer of claim 1, wherein the high voltage lead outgoing line (15) is connected to the high voltage lead by a connector comprising a high voltage lead insert (13) and a high voltage lead screw (14).
4. The insulator type low partial discharge high-voltage lead shielding module 10kV current transformer according to claim 1, wherein the low-potential shielding copper mesh is a copper mesh with a larger curvature radius.
5. The insulator low partial discharge high voltage lead shield module 10kV current transformer of claim 1, characterized in that the low potential shield copper mesh (8) is in a circular ring shape in a top down cross section; there is a certain distance between low potential shielding copper net (8) lower extreme with the upper end of high-voltage lead inlaying female (13), low potential metalwork with winding lead is vertical setting, the one end of low potential metalwork and the one end side fixed connection of low potential shielding copper net (8), the opposite side of low potential metalwork is through backing bar (20) and installation inlaying female (11) electricity.
6. The insulator type low partial discharge high-voltage lead shielding module 10kV current transformer according to claim 5, wherein the mounting embedded nut (11) is connected with the low-potential shielding copper net (8) through a connecting support rod (20); and welding is adopted between the connecting support rod (20) and the mounting embedded nut (11) and between the connecting support rod (20) and the low-potential shielding copper net (8).
7. The insulator low partial discharge high voltage lead shield module 10kV current transformer of claim 1, wherein the epoxy resin (3) is cast into the insulator (18) under a full vacuum environment.
8. The insulator type low partial discharge high-voltage lead wire shielding module 10kV current transformer according to claim 2, wherein the high-voltage shielding (2), the secondary coil shielding (4), the winding lead wire shielding (9) and the high-voltage lead wire shielding (10) are all formed by wrapping semiconductor paper tapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982469.4A CN115547654B (en) | 2022-08-16 | 2022-08-16 | 10kV current transformer of insulator type low partial discharge high-voltage lead shielding module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982469.4A CN115547654B (en) | 2022-08-16 | 2022-08-16 | 10kV current transformer of insulator type low partial discharge high-voltage lead shielding module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115547654A CN115547654A (en) | 2022-12-30 |
| CN115547654B true CN115547654B (en) | 2023-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210982469.4A Active CN115547654B (en) | 2022-08-16 | 2022-08-16 | 10kV current transformer of insulator type low partial discharge high-voltage lead shielding module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115547654B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3380009A (en) * | 1967-03-10 | 1968-04-23 | Gen Electric | High voltage current transformer |
| CN108461266A (en) * | 2018-03-15 | 2018-08-28 | 大连北方互感器集团有限公司 | A kind of current transformer with low pressure shielding |
| CN211929284U (en) * | 2020-05-25 | 2020-11-13 | 雷兹互感器（上海）有限公司 | Epoxy cast current transformer with capacitance voltage division |
| CN212516877U (en) * | 2020-06-05 | 2021-02-09 | 郑州三晖互感器有限公司 | High-voltage partial discharge-free SF6 gas and epoxy resin insulated voltage transformer |
-
2022
- 2022-08-16 CN CN202210982469.4A patent/CN115547654B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3380009A (en) * | 1967-03-10 | 1968-04-23 | Gen Electric | High voltage current transformer |
| GB1145420A (en) * | 1967-03-10 | 1969-03-12 | Gen Electric | Improvements in high voltage current transformer |
| CN108461266A (en) * | 2018-03-15 | 2018-08-28 | 大连北方互感器集团有限公司 | A kind of current transformer with low pressure shielding |
| CN211929284U (en) * | 2020-05-25 | 2020-11-13 | 雷兹互感器（上海）有限公司 | Epoxy cast current transformer with capacitance voltage division |
| CN212516877U (en) * | 2020-06-05 | 2021-02-09 | 郑州三晖互感器有限公司 | High-voltage partial discharge-free SF6 gas and epoxy resin insulated voltage transformer |
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| CN115547654A (en) | 2022-12-30 |
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