CN113823495A - Bi-linear package subassembly and high-voltage self-boost standard current transformer - Google Patents
Bi-linear package subassembly and high-voltage self-boost standard current transformer Download PDFInfo
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- 238000004804 winding Methods 0.000 claims abstract description 95
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 230000009466 transformation Effects 0.000 claims description 7
- 230000009977 dual effect Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 53
- 238000005259 measurement Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
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- 238000012795 verification Methods 0.000 description 4
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- 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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- 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
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- 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
- H01F2038/305—Constructions with toroidal magnetic core
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Abstract
The utility model relates to a bifilar package subassembly and high-voltage self-current-rising standard current transformer, relating to the technical field of transformer calibration, wherein the bifilar package subassembly comprises a bifilar package body, a shielding layer and a primary winding, the bifilar package body comprises a current riser package and a standard current transformer package, the current riser package comprises a first annular iron core and a first secondary winding spirally wound on the first annular iron core along the circumferential direction of the first annular iron core; the standard current transformer coil comprises a second annular iron core and a second secondary winding spirally wound on the second annular iron core along the circumferential direction of the second annular iron core; the shielding layer is laid on the double-coil body along the circumferential direction of the double-coil body; one end of the shielding layer is grounded; the primary winding is wound on the shielding layer. The high-voltage self-current-rising standard current transformer comprises a cylinder and a double-wire package assembly, wherein a primary winding is used for being connected with the current transformer to be detected in series; the first secondary winding and the second secondary winding are respectively used for being connected with the voltage regulator and the transformer calibrator.
Description
Technical Field
The application relates to the technical field of mutual inductor calibration, in particular to a double-line pack assembly and a high-voltage self-current-rising standard current transformer.
Background
According to the regulation of the verification regulation, a comparison difference measurement method is required to be adopted for measuring the error of the current transformer, and the error of the standard current transformer is required to be smaller than 1/5 of the error of the detected current transformer, so that the influence of the error of the standard current transformer on the measurement result can be basically ignored, and the error of the detected current transformer can be read by the transformer calibrator. The standard current transformer used in both high-voltage and low-voltage states needs to be subjected to error measurement in a low-voltage state according to the requirements of JJG313-2010 Current Transformer for measurement.
With the release of the verification regulation of JJG1165-2019 'three-phase combined transformer', the verification of the current transformer in the combined transformer needs to be carried out at high voltage. When the standard current transformer or the power current transformer works, leakage current exists between the primary winding and the secondary winding, the leakage current under low voltage is small and can be ignored, but the leakage current increases along with the increase of voltage, and the leakage current under high voltage cannot be ignored. Leakage currents will have a large impact on the error. The error measurement work of the standard current transformer is carried out at low voltage, and the actual error in a high-voltage state cannot be accurately reflected. The measured data in the two states have deviation, the measuring effect is poor, and the using effect is not good.
In order to reduce the number of test equipment and the workload of test wiring, the integrated design of the current booster and the standard current transformer is provided during the verification of the current transformer. However, the integrated design structure greatly increases the leakage current of the input winding terminal of the current booster to the secondary winding of the standard current transformer, and also has great influence on error checking.
Therefore, how to reduce the influence of the leakage current of the standard current transformer under the high voltage on the error check and the influence of the leakage current of the self-current-rising standard current transformer on the error check is a common problem in the error check of the current transformer.
In the related art, chinese patent 201410682159.6 mainly develops research on the influence of leakage current error on a capacitor voltage transformer; chinese patent 201811408333.2 realizes error measurement of a high-voltage current transformer by measuring and analyzing leakage current of the high-voltage current transformer to be measured, establishing a test model, and arranging an electromagnetic shielding layer in the high-voltage current transformer to be measured.
The above-mentioned techniques propose a method for measuring leakage current and the influence of leakage current on calibration error, but do not solve the problem of how to reduce the influence of leakage current of a standard device and a current booster on error calibration.
Disclosure of Invention
The embodiment of the application provides a two-wire package assembly and a high-voltage self-current-rising standard current transformer, so that the problem of how to reduce the influence of a standard device and the leakage current of a current booster on error checking, which is not mentioned in the related art, is solved.
In a first aspect, a two-wire package assembly is provided, comprising:
the double-coil body comprises a current booster coil and a standard current transformer coil, wherein the current booster coil comprises a first annular iron core and a first secondary winding spirally wound on the first annular iron core along the circumferential direction of the first annular iron core; the standard current transformer coil comprises a second annular iron core and a second secondary winding spirally wound on the second annular iron core along the circumferential direction of the second annular iron core; the second annular iron core and the first annular iron core are coaxially arranged;
the shielding layer is laid on the double-coil body along the circumferential direction of the double-coil body; one end of the shielding layer is grounded;
a primary winding spirally wound on the shielding layer in a circumferential direction of the shielding layer.
In some embodiments, the shield layer also fully encapsulates the input end of the first secondary winding.
In some embodiments, the dual-wire package assembly further includes a first insulating layer disposed between the dual-wire package body and the shielding layer, and the first insulating layer is laid on the dual-wire package body around a circumferential direction of the dual-wire package body.
In some embodiments, the dual wire package assembly further comprises a second insulating layer, the second insulating layer is located between the shielding layer and the primary winding, and the second insulating layer is laid on the shielding layer around the circumferential direction of the dual wire package body.
In some embodiments, a circle of break points is arranged on the shielding layer along the circumferential direction of the double-coil body.
In a second aspect, a high voltage self-current-rising standard current transformer is provided, which comprises:
a cylinder body having an accommodating space therein; and the number of the first and second groups,
the double-wire-bag assembly is accommodated in the accommodating space; the outlet end of the primary winding is led out from the top end of the cylinder and is used for being connected with a current transformer to be detected in series; and the wire outlet ends of the first secondary winding and the second secondary winding are led out from the side wall of the cylinder body and are respectively used for being connected with a voltage regulator and a mutual inductor calibrator.
In some embodiments, a plurality of taps are led out from the outlet end of the primary winding, wherein one of the taps is a common end, and the rest of the taps correspond to different current carrying capacities and are used for matching with the common end to generate different current transformation ratios.
In some embodiments, the standard current transformer further comprises a sleeve, the sleeve extends into the barrel from the top end of the barrel, a plurality of copper rods are arranged in the sleeve, each copper rod corresponds to one tap, one end of each copper rod is connected with the tap, the other end of each copper rod is connected with a binding post, and the binding post is used for connecting a current transformer to be tested.
In some embodiments, the bottom end of the dual winding package assembly is fixed in the barrel through a base, and a wire outlet hole is formed in a side wall of the base and used for leading out wire outlet ends of the first secondary winding and the second secondary winding.
In some embodiments, the side wall of the cylinder is provided with an operation hole penetrating through the cylinder.
The beneficial effect that technical scheme that this application provided brought includes: the shielding layer of the embodiment of the application is a whole, one end of the shielding layer is grounded, and the leakage current is led into the ground, so that the influence of the leakage current on error checking is prevented; and the shielding layer wraps the second secondary winding of the standard current transformer coil and the first secondary winding of the current booster coil, so that the influence of leakage current existing between the high-voltage next primary winding and the first secondary winding and the second secondary winding on error checking can be reduced when error measurement is actually carried out.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a cross-sectional view of a dual wire package assembly provided in accordance with an embodiment of the present application;
fig. 2 is a schematic diagram of a high-voltage self-current-boosting standard current transformer according to an embodiment of the present application;
FIG. 3 is a shielding schematic diagram of a shielding layer provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a high-voltage self-current-rising standard current transformer provided in an embodiment of the present application;
fig. 5 is a full sectional view of fig. 4.
In the figure: 1. a double-coil body; 10. a riser coil; 100. a first annular core; 101. a first secondary winding; 102. an input end; 11. a standard current transformer coil; 110. a second annular iron core; 111. a second secondary winding; 2. a shielding layer; 3. a primary winding; 4. a first insulating layer; 5. a second insulating layer; 6. a barrel; 60. a base; 61. an operation hole; 7. a current transformer to be tested; 8. a mutual inductor calibrator; 9. a sleeve; 90. a copper rod; 91. and (4) binding posts.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1:
referring to fig. 1, embodiment 1 of the present application provides a bifilar pack assembly, which includes a bifilar pack body 1, a shielding layer 2, and a primary winding 3, wherein the bifilar pack body 1 includes a current booster pack 10 and a standard current transformer pack 11, the current booster pack 10 includes a first toroidal core 100, and a first secondary winding 101 spirally wound on the first toroidal core 100 along a circumferential direction of the first toroidal core 100; the first annular iron core 100 is a silicon steel sheet annular iron core; the standard current transformer coil 11 includes a second toroidal core 110, and a second secondary winding 111 spirally wound around the second toroidal core 110 along a circumferential direction of the second toroidal core 110, the second toroidal core 110 being an ultra-microcrystalline toroidal core; the second toroidal core 110 is disposed coaxially with the first toroidal core 100; the shielding layer 2 is laid on the double-wire pack body 1 along the circumferential direction of the double-wire pack body 1, the shielding layer 2 is a whole body, is soft in material and good in magnetic conduction and flow conductivity, and wraps the first secondary winding 101, the second secondary winding 111 and the input end 102 of the first secondary winding 101 so as to reduce the influence of the leakage current of the standard current transformer under high voltage on error checking; one end of the shielding layer 2 is grounded, so that leakage current is led into the ground, and the influence of the leakage current on error checking is prevented; the primary winding 3 is spirally wound on the shielding layer 2 along the circumferential direction of the shielding layer 2, and the current booster coil 10 and the standard current transformer coil 11 share the primary winding 3, so that the primary winding 3 is wound more tightly, the magnetic flux leakage is smaller, and the magnetic permeability is further improved.
Referring to fig. 2, the transformer calibrator 8 includes a first interface, a second interface, and a third interface, the current booster is SL, the standard current transformer is CTO, and the current transformer to be tested is CTx. When error measurement is actually carried out, the outlet end of the primary winding 3 is connected with the current transformer 7 to be measured in series; a tap is led out from a first secondary winding 101 of the current booster coil package 10, and the current booster coil package is externally connected with a voltage regulator and provides an input signal for a standard current transformer coil package 11; a tap is led out from one end of a second secondary winding 111 of the standard current transformer coil 11 and is connected with the transformer calibrator 8, and the other end of the second secondary winding is connected with the tested current transformer 7; the other end of the tested current transformer 7 is connected with a transformer calibrator 8 to obtain test data; the first interface is used for accessing a secondary current signal To of a standard current transformer coil 11, the second interface is used for accessing a secondary current signal Tx of the current transformer 7 To be tested, and the third interface is used for accessing a differential signal K formed by the secondary current signal To and the secondary current signal Tx, and whether a detection result of the current environment of the current transformer 7 To be tested is qualified is judged according To a ratio of the differential signal K To the secondary current signal To.
Referring to fig. 3, fig. 3 is a schematic diagram of shielding provided in embodiment 1 of the present application. The shielding layer 2 is a whole, one end of the shielding layer is grounded, and leakage current is led into the ground, so that the influence of the leakage current on error checking is prevented; and the shielding layer 2 wraps the second secondary winding 111 of the standard current transformer coil 11 and the first secondary winding 101 of the current booster coil 10, so that the influence of leakage current existing between the high-voltage next primary winding 3 and the first secondary winding 101 and the second secondary winding 111 on error checking can be reduced during actual error measurement.
Referring to fig. 3, the shielding layer 2 preferably also fully encapsulates the input end 102 of the first secondary winding 101.
The shielding layer 2 also wraps around the input end 102 of the first secondary winding 101 of the current booster coil 10, reducing the effect of the input terminal of the current booster coil 10 on the leakage current generated by the second secondary winding 111 of the standard current transformer coil 11 due to the integrated design of the current booster SL and the standard current transformer CT 0.
The input end of the first secondary winding 101 of the riser package 10 is twisted to reduce interference.
Optionally, referring to fig. 1, the dual-wire package assembly further includes a first insulating layer 4, the first insulating layer 4 is located between the dual-wire package body 1 and the shielding layer 2, and the first insulating layer 4 is laid on the dual-wire package body 1 around the circumferential direction of the dual-wire package body 1.
In order to prevent the shield layer 2 from being conductive with the double wire body 1, a first insulating layer 4 is laid between the double wire body 1 and the shield layer 2 to insulate the shield layer 2 from the double wire body 1.
Optionally, referring to fig. 1, the dual-wire package assembly further includes a second insulating layer 5, the second insulating layer 5 is located between the shielding layer 2 and the primary winding 3, and the second insulating layer 5 is laid on the shielding layer 2 around the circumferential direction of the dual-wire package body 1.
By arranging the second insulating layer 5, the interlayer distance between the primary winding 3 and the secondary winding is increased, the interlayer capacitance is reduced, the coupling influence between the primary winding 3 and the secondary winding is reduced, and the insulating protection effect on high voltage between the primary winding 3 and the secondary winding is achieved.
Optionally, a circle of break points is arranged on the shielding layer 2 along the circumferential direction of the double-wire packet body 1 to prevent a loop from being formed.
The beneficial effects brought by the technical scheme provided by the embodiment 1 of the application comprise:
1. the method and the device can work in a high-voltage state, solve the problems that when the error of the current transformer is checked in the high-voltage state, the leakage current of the standard voltage transformer is large and the leakage current is converged into a differential measurement loop, and further the actual error cannot be accurately measured, and meet the requirements of a checking regulation JJJJG 1165-2019 three-phase combined transformer.
2. The influence of leakage current that rises the current ware and produce to the error check that the integrated design of current rise ware and standard current transformer brought has been solved in this application embodiment 1, has realized current rise ware and standard current transformer integrated design, has reduced test equipment quantity, wiring quantity and experimental occupation space to be provided with terminal and wiring board, it is more convenient to operate.
3. The shielding layer 2 of embodiment 1 of the present application wraps the second secondary winding 111 of the standard current transformer coil 11, the first secondary winding 101 of the current booster coil 10, and the input end 102 of the first secondary winding 101 of the current booster coil 10; and one end of the shielding layer 2 is grounded, so that the influence of leakage current existing between a primary winding and a secondary winding of the standard current transformer under high voltage on error checking and the influence of leakage current generated by coupling of an input terminal of a current booster coil and the secondary winding of the standard current transformer coil can be reduced, the accuracy of transformer checking is improved, and the fairness and the justness of metering performance are ensured.
4. The primary winding 3 of embodiment 1 of the application is provided with a plurality of taps, can satisfy the multiple transformation ratio demand when current transformer error check-up, solves the technical problem that the transformation ratio switching is inconvenient, intensity of labour is big, has improved test efficiency greatly.
Example 2:
referring to fig. 4 and 5, embodiment 2 of the present application provides a high-voltage self-current-rising standard current transformer, which includes a cylinder 6 and a dual-wire package assembly, wherein the cylinder 6 has a receiving space therein; the double-wire-bag assembly is accommodated in the accommodating space; the outlet end of the primary winding 3 is led out from the top end of the cylinder 6 and is used for being connected with a current transformer 7 to be detected in series; the outlet ends of the first secondary winding 101 and the second secondary winding 111 are led out from the side wall of the cylinder 6 and are respectively used for being connected with the voltage regulator and the transformer calibrator 8.
Referring to fig. 2, the transformer calibrator 8 includes a first interface, a second interface, and a third interface, the current booster is SL, the standard current transformer is CTO, and the current transformer to be tested is CTx. When error measurement is actually carried out, the outlet end of the primary winding 3 is led out from the top end of the cylinder 6 and is used for being connected with a current transformer 7 to be measured in series; a first secondary winding 101 of the current booster coil 10 leads out a tap from a panel on the side wall of the cylinder 6, is externally connected with a voltage regulator and provides an input signal for a standard current transformer coil 11; one end of a second secondary winding 111 of the standard current transformer coil 11 is led out from a panel on the side wall to be tapped and connected with the transformer calibrator 8, and the other end of the second secondary winding is connected with the tested current transformer 7; the other end of the tested current transformer 7 is connected with a transformer calibrator 8 to obtain test data; the first interface is used for accessing a secondary current signal To of a standard current transformer coil 11, the second interface is used for accessing a secondary current signal Tx of the current transformer 7 To be tested, and the third interface is used for accessing a differential signal K formed by the secondary current signal To and the secondary current signal Tx, and whether a detection result of the current environment of the current transformer 7 To be tested is qualified is judged according To a ratio of the differential signal K To the secondary current signal To.
Referring to fig. 3, fig. 3 is a schematic diagram of shielding provided in embodiment 1 of the present application. The shielding layer 2 is a whole, one end of the shielding layer is grounded, the shielding layer wraps the second secondary winding 111 of the standard current transformer coil 11 and the first secondary winding 101 of the current booster coil 10, and the influence of leakage current existing between the high-voltage next secondary winding 3 and the first secondary winding 101 and the second secondary winding 111 on error checking can be reduced when error measurement is actually carried out.
Optionally, a plurality of taps are led out from the outlet end of the primary winding 3, one of the taps is a common end, and the remaining taps correspond to different current carrying capacities and are used for being matched with the common end to generate different current transformation ratios.
The primary winding 3 of embodiment 2 of the application is provided with a plurality of taps, can satisfy the multiple transformation ratio demand when current transformer error check-up, solves the technical problem that the transformation ratio switching is inconvenient, intensity of labour is big, has improved test efficiency greatly.
Further, this standard current transformer still includes sleeve pipe 9, and in sleeve pipe 9 stretched into barrel 6 from the top of barrel 6, and was equipped with a plurality of copper poles 90 in the sleeve pipe 9, every copper pole 90 corresponds a tap, and the one end of copper pole 90 with take a percentage and be connected, terminal 91 is connected to the other end, terminal 91 is used for connecting the measured current transformer.
Further, the bottom end of the double-wire-pack assembly is fixed in the cylinder 6 through the base 60, and a wire outlet hole is formed in the side wall of the base 60 and used for leading out wire outlet ends of the first secondary winding 101 and the second secondary winding 111.
The base 60 of this application embodiment 2 is the epoxy base, and the space that forms between two wire package subassemblies and the epoxy base fills insulating resin.
Further, an operation hole 61 penetrating the cylinder 6 is formed in a side wall of the cylinder 6.
The operator can install and connect the components in the cylinder 6 through the operation hole 61.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, 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. Also, 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A dual-wire package assembly, comprising:
the double-coil body (1) comprises a current booster coil (10) and a standard current transformer coil (11), wherein the current booster coil (10) comprises a first annular iron core (100) and a first secondary winding (101) spirally wound on the first annular iron core (100) along the circumferential direction of the first annular iron core (100); the standard current transformer coil (11) comprises a second annular iron core (110) and a second secondary winding (111) spirally wound on the second annular iron core (110) along the circumferential direction of the second annular iron core (110); the second annular iron core (110) is coaxially arranged with the first annular iron core (100);
a shielding layer (2) laid on the double-coil body (1) along the circumferential direction of the double-coil body (1); one end of the shielding layer (2) is grounded;
a primary winding (3) spirally wound on the shielding layer (2) in a circumferential direction of the shielding layer (2).
2. The double wire package assembly according to claim 1, wherein the shielding layer (2) also fully encases the input end (102) of the first secondary winding (101).
3. The double-wire pack assembly according to claim 1, further comprising a first insulating layer (4), wherein the first insulating layer (4) is located between the double-wire pack body (1) and the shielding layer (2), and the first insulating layer (4) is laid on the double-wire pack body (1) around a circumferential direction of the double-wire pack body (1).
4. The double wire package assembly according to claim 1, further comprising a second insulating layer (5), wherein the second insulating layer (5) is located between the shielding layer (2) and the primary winding (3), and wherein the second insulating layer (5) is laid on the shielding layer (2) around the circumferential direction of the double wire package body (1).
5. The twin-wire package assembly according to claim 1, characterised in that the shielding layer (2) is provided with a break in the circumferential direction of the twin-wire package body (1).
6. The utility model provides a high pressure is from standard current transformer that rises which characterized in that, it includes:
a cylinder (6) having an accommodating space therein; and the number of the first and second groups,
the dual wire package assembly of claim 1, housed within the housing space; the outlet end of the primary winding (3) is led out from the top end of the cylinder (6) and is used for being connected with a tested current transformer (7) in series; and the outlet ends of the first secondary winding (101) and the second secondary winding (111) are led out from the side wall of the cylinder (6) and are respectively used for being connected with a voltage regulator and a transformer calibrator (8).
7. The high-voltage self-current-rising standard current transformer according to claim 6, wherein a plurality of taps are led out from the outlet end of the primary winding (3), one of the taps is a common end, and the rest of the taps correspond to different current carrying capacities and are used for being matched with the common end to generate different current transformation ratios.
8. The high-voltage self-current-boosting standard current transformer according to claim 7, further comprising a sleeve (9), wherein the sleeve (9) extends into the barrel (6) from the top end of the barrel (6), a plurality of copper rods (90) are arranged in the sleeve (9), each copper rod (90) corresponds to one tap, one end of each copper rod (90) is connected with the tap, the other end of each copper rod is connected with a binding post (91), and the binding post (91) is used for connecting the tested current transformer.
9. The high-voltage self-current-rising standard current transformer according to claim 6, wherein the bottom end of the dual-winding assembly is fixed in the barrel (6) through a base (60), and a wire outlet hole is formed in a side wall of the base (60) and used for leading out wire outlet ends of the first secondary winding (101) and the second secondary winding (111).
10. The high-voltage self-current-rising standard current transformer according to claim 6, wherein the side wall of the cylinder (6) is provided with an operation hole (61) penetrating through the cylinder (6).
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| CN113823495B (en) | 2022-02-08 |
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