CN219738712U - Rogowski coil current transformer and current transformer for circuit breaker - Google Patents
Rogowski coil current transformer and current transformer for circuit breaker Download PDFInfo
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- CN219738712U CN219738712U CN202321149518.2U CN202321149518U CN219738712U CN 219738712 U CN219738712 U CN 219738712U CN 202321149518 U CN202321149518 U CN 202321149518U CN 219738712 U CN219738712 U CN 219738712U
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- 238000004804 winding Methods 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 13
- 239000011889 copper foil Substances 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
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Abstract
The utility model discloses a rogowski coil current transformer. The circuit comprises a group of identical Rogowski coil printed circuit boards with annular winding parts; the annular winding part is provided with 3 groups of inner ring through holes and one group of outer ring through holes, the number of each group of inner ring through holes is N, and the number of each group of outer ring through holes is 3N; the 1 st to 3 rd groups of inner ring through holes and the outer ring through holes are uniformly distributed on 4 concentric circles which take the center of the annular winding part as the center of a circle and have sequentially increased radius, and the connecting lines between any two through holes and the center of the circle are not overlapped; the annular winding part is also provided with metal wires which sequentially and continuously pass through all the through holes to the last through hole of the inner ring from the first through hole of the outer ring to the last through hole of the inner ring in the order of small offset included angles between the first through hole of the outer ring and the first through hole of the outer ring at intervals one by one. The utility model also discloses a current transformer for the circuit breaker. The utility model has wide current measuring range, high precision and good anti-interference performance.
Description
Technical Field
The utility model relates to a transformer, in particular to a rogowski coil current transformer.
Background
The current low-voltage circuit breaker is continuously developed in the forward direction of intellectualization, miniaturization and high-precision direction, and is particularly important for accurate measurement of various electrical parameters, particularly current. The conventional low-voltage circuit breaker generally adopts a technical scheme that an iron core current transformer is used for simultaneously carrying out current detection and self-generated power supply, however, as the primary working current of the low-voltage circuit breaker is as small as several amperes and as large as thousands of amperes, the scheme that the iron core current transformer is used for carrying out current detection has the problem that the output signal is nonlinear distorted due to high current saturation, so that the existing high-performance low-voltage circuit breaker adopts a double-current transformer technology which fuses a rogowski coil current transformer for measurement and an iron core current transformer for power supply.
The traditional Rogowski coil current transformer is manufactured by winding an enamelled wire on an annular non-magnetic framework through manual or winding equipment, has the advantages of simple structure, no magnetic saturation problem, wide current measurement range and the like, but due to process limitation, the Rogowski coil current transformer cannot ensure that coil winding is uniform and sectional area is equal, and the same batch of product parameters are difficult to ensure and have poor anti-interference performance. Compared with the traditional Rogowski coil, the PCB Rogowski coil has the advantages of high precision, low cost, good coil parameter consistency, easiness in batch production and the like, but the PCB Rogowski coil is also limited in process in the aspects of plate thickness, via hole size, wiring line width, wiring distance and the like, the number of turns of the PCB Rogowski coil is very limited under the limit of limited PCB size, and the sectional area of each turn of the coil is smaller, so that the mutual inductance of the PCB Rogowski coil is lower, the output voltage is lower, and the subsequent signal processing circuit is challenged.
Disclosure of Invention
The utility model aims to solve the technical problems of overcoming the defects of the prior art and providing the Rogowski coil current transformer which has the advantages of wide current measurement range, high precision, good anti-interference performance, low cost, good consistency of coil parameters, easy batch production, simple operation and better applicability compared with the existing PCB Rogowski coil.
The technical scheme adopted by the utility model specifically solves the technical problems as follows:
the Rogowski coil current transformer comprises a group of identical Rogowski coil printed circuit boards, wherein the Rogowski coil printed circuit boards are double-layer printed circuit boards with annular winding parts; the annular winding part is provided with 3 groups of inner ring through holes and one group of outer ring through holes, the number of each group of inner ring through holes is N, the number of the outer ring through holes is 3N, and N is an integer greater than or equal to 2; the 1 st to 3 rd groups of inner ring through holes and the outer ring through holes are uniformly distributed on 4 concentric circles which take the center of the annular winding part as a circle center and have sequentially increased radius, and the dislocation included angles between the first group of inner ring through holes and the second group of inner ring through holes and between the first group of inner ring through holes and the third group of inner ring through holes are 180 degrees/N and 120 degrees/N respectively, wherein the dislocation included angle between any two groups of inner ring through holes is the minimum included angle formed by the connecting lines of all inner ring through holes and the circle center in the two groups of inner ring through holes; the annular winding part is also provided with metal wires which sequentially and continuously pass through all the through holes to the last through hole of the inner ring from the first outer ring through hole in a mode of spacing the outer ring through holes and the inner ring through holes one by one from the first outer ring through hole in order of small to large offset included angles between the two through holes and the circle center, and the metal wires form a series of radial sections serving as the main body part of the annular winding part, wherein the offset included angles between any two through holes refer to included angles between connecting lines of the two through holes and the circle center; the radial sections are uniformly and vertically symmetrically arranged on the top layer and the bottom layer of the double-layer printed circuit board, the straight lines of the radial sections on the same layer are intersected on the central axis of the concentric circle, and the radial included angle between two adjacent radial sections is 120 degrees/N; the metal wiring further comprises a circle of circular loop which is arranged at the vacant position on the top layer or the bottom layer of the double-layer printed circuit board close to the outer ring via hole along the opposite direction of the circumferential wiring of the radial section by taking the last inner ring via hole as a starting point.
Further, the rogowski coil current transformer further comprises a first bonding pad and a second bonding pad protruding out of the annular winding part, the first bonding pad and the second bonding pad are respectively arranged on the top layer and the bottom layer of the double-layer printed circuit board in an up-down symmetrical mode, the first bonding pad is connected with the first outer ring through hole, and the second bonding pad is connected with the terminal of the circular loop.
Preferably, the rogowski coil current transformer is formed by stacking at least two rogowski coil printed circuit boards up and down along the same central axis.
Further preferably, an insulating sheet is provided between the annular winding portions of the adjacent two rogowski coil printed circuit boards.
Further, the rogowski coil printed circuit board is provided with at least one positioning part outside the annular winding part.
The following technical scheme can be obtained based on the same inventive concept:
the current transformer for the circuit breaker comprises a Rogowski coil current transformer for measurement and an iron core current transformer for power supply, wherein the Rogowski coil current transformer is the Rogowski coil current transformer according to any one of the technical schemes.
Preferably, the rogowski coil current transformer and the core current transformer are enclosed in the same housing.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model adopts special via hole and wiring design, can lead the total number of the via holes of the multi-circle inner ring to reach the maximum number of the via holes which can be arranged on the outer ring by arranging the via holes of the multi-circle inner ring in the area close to the inner ring of the PCB under the limit of the same limited PCB size, increases the total number of turns of the PCB Rogowski coil under the condition of ensuring that the ratio of the outer diameter to the inner diameter of the coil is not too small, and improves the mutual inductance. Meanwhile, the scheme of obtaining the Rogowski coil current transformer with the proper transformation ratio by freely combining a plurality of Rogowski coil printed circuit boards is provided, the operation is simple, and the applicability is better.
Drawings
Fig. 1 is a schematic diagram showing the basic structure of one embodiment of a current transformer for a circuit breaker according to the present utility model;
FIG. 2 is a schematic diagram of the structure of the Rogowski coil current transformer of the utility model;
FIG. 3 is a schematic diagram of a routing pattern of a Rogowski coil printed circuit board; wherein the left side is the top layer wiring of the Rogowski coil printed circuit board, and the right side is the bottom layer wiring from the top layer perspective;
FIG. 4 is a schematic diagram of another routing scheme of the Rogowski coil printed circuit board; wherein the left side is the bottom wiring of the top perspective of the Rogowski coil printed circuit board, and the right side is the top wiring of the Rogowski coil printed circuit board;
FIG. 5 is a schematic diagram of a stacked configuration of a Rogowski coil printed circuit board;
FIG. 6 is a schematic diagram of another stacked configuration of a Rogowski coil printed circuit board;
FIG. 7 is a schematic diagram of a Roche coil printed circuit board structure with locating holes;
the reference numerals in the drawings have the following meanings:
1. an iron core current transformer; 2. a rogowski coil current transformer; 3. a housing; 4. an insulating separator; 21. an annular winding part; 211-218, via holes; 22. an interface part; 221. a first bonding pad; 222. a second bonding pad; 23. an insulating sheet; 24. a positioning part; i, a Roche coil printed circuit board; II, a Roche coil printed circuit board.
Detailed Description
Current transformers for existing circuit breakers generally comprise an energy transformer for power supply and a PCB rogowski coil current transformer for measurement, which are packaged together, wherein the PCB rogowski coil current transformer is receiving more and more attention due to its advantages of low cost, good parameter consistency, etc., however, when arranged in a limited space of a low voltage circuit breaker, the mutual inductance of the PCB rogowski coil current transformer is often low, and thus is limited in practical use.
According to the formula of the Rogowski coil mutual inductanceThe mutual inductance of the PCB Rogowski coil is directly proportional to the number of turns n, the thickness h of the PCB and the natural logarithm ln (R outside/R inside) of the ratio of the outer diameter to the inner diameter of the coil. In order to achieve better anti-interference performance, the PCB Rogowski coil is generally arranged into a circular ring shape like a traditional wound Rogowski coil, and is formed by mutually connecting an outer ring via hole and an inner ring via hole on the PCB. Obviously, the number of the through holes which can be arranged on the outer ring of the PCB is obviously more than that of the through holes which can be arranged on the inner ring, for example, when the radius of the outer ring is about 3 times of that of the inner ring, the number of the through holes which can be arranged on the outer ring of the PCB is about 3 times of that of the inner ring, 1-turn coil can be formed by every 2 through holes on the PCB, and obviously, the total number of turns of the Rogowski coil of the PCB is limited by the number of the through holes of the inner ring of the PCB. The natural logarithm ln (R outside/R inside) of the ratio of the outer diameter to the inner diameter of the coil greatly affects the mutual inductance of the PCB Roche coil, so that the radius of the circle where the inner ring via hole is located cannot be selected too large. In practice, when arranging the PCB coils, the space near the inner ring is fully utilized, while the further away from the inner ring, the more unused free positions on the PCB are.
In order to solve the problems, the utility model provides the following technical scheme:
the Rogowski coil current transformer comprises a group of identical Rogowski coil printed circuit boards, wherein the Rogowski coil printed circuit boards are double-layer printed circuit boards with annular winding parts; the annular winding part is provided with 3 groups of inner ring through holes and one group of outer ring through holes, the number of each group of inner ring through holes is N, the number of the outer ring through holes is 3N, and N is an integer greater than or equal to 2; the 1 st to 3 rd groups of inner ring through holes and the outer ring through holes are uniformly distributed on 4 concentric circles which take the center of the annular winding part as a circle center and have sequentially increased radius, and the dislocation included angles between the first group of inner ring through holes and the second group of inner ring through holes and between the first group of inner ring through holes and the third group of inner ring through holes are 180 degrees/N and 120 degrees/N respectively, wherein the dislocation included angle between any two groups of inner ring through holes is the minimum included angle formed by the connecting lines of all inner ring through holes and the circle center in the two groups of inner ring through holes; the annular winding part is also provided with metal wires which sequentially and continuously pass through all the through holes to the last through hole of the inner ring from the first outer ring through hole in a mode of spacing the outer ring through holes and the inner ring through holes one by one from the first outer ring through hole in order of small to large offset included angles between the two through holes and the circle center, and the metal wires form a series of radial sections serving as the main body part of the annular winding part, wherein the offset included angles between any two through holes refer to included angles between connecting lines of the two through holes and the circle center; the radial sections are uniformly and vertically symmetrically arranged on the top layer and the bottom layer of the double-layer printed circuit board, the straight lines of the radial sections on the same layer are intersected on the central axis of the concentric circle, and the radial included angle between two adjacent radial sections is 120 degrees/N; the metal wiring further comprises a circle of circular loop which is arranged at the vacant position on the top layer or the bottom layer of the double-layer printed circuit board close to the outer ring via hole along the opposite direction of the circumferential wiring of the radial section by taking the last inner ring via hole as a starting point.
Further, the rogowski coil current transformer further comprises a first bonding pad and a second bonding pad protruding out of the annular winding part, the first bonding pad and the second bonding pad are respectively arranged on the top layer and the bottom layer of the double-layer printed circuit board in an up-down symmetrical mode, the first bonding pad is connected with the first outer ring through hole, and the second bonding pad is connected with the terminal of the circular loop.
Preferably, the rogowski coil current transformer is formed by stacking at least two rogowski coil printed circuit boards up and down along the same central axis.
Further preferably, an insulating sheet is provided between the annular winding portions of the adjacent two rogowski coil printed circuit boards.
Further, the rogowski coil printed circuit board is provided with at least one positioning part outside the annular winding part.
The following technical scheme can be obtained based on the same inventive concept:
the current transformer for the circuit breaker comprises a Rogowski coil current transformer for measurement and an iron core current transformer for power supply, wherein the Rogowski coil current transformer is the Rogowski coil current transformer according to any one of the technical schemes.
Preferably, the rogowski coil current transformer and the core current transformer are enclosed in the same housing.
For the convenience of public understanding, the following detailed description of the technical scheme of the utility model is provided with reference to the accompanying drawings:
as shown in fig. 1, the current transformer for the circuit breaker of the present utility model comprises a rogowski coil current transformer 2 for measurement and an iron core current transformer 1 for power supply, which are packaged in a housing 3 and are stacked up and down, and an insulating partition 4 is provided between the rogowski coil current transformer 2 and the iron core current transformer 1.
As shown in fig. 2 and 3, the rogowski coil current transformer 2 includes at least one rogowski coil printed circuit board, which is an annular two-layer printed circuit board, and includes an annular winding portion 21, 90 inner ring vias and 90 outer ring vias, each of which is formed by 30 first inner ring vias, 30 second inner ring vias and 30 third inner ring vias, are disposed on the annular winding portion 21, the first inner ring vias, the second inner ring vias, the third inner ring vias and the outer ring vias are uniformly distributed on four concentric circles with the center of the annular winding portion as the center of the circle and the radii of which are R1, R2, R3 and R4, respectively, and R1< R2< R3< R4; defining the minimum included angle formed by the connecting lines of all inner ring through holes in any two groups of inner ring through holes and the circle center as the dislocation included angle between the two groups of inner ring through holes, and defining the included angle between the connecting lines of any two through holes and the circle center as the offset included angle between the two through holes; the dislocation included angle between the first inner ring via hole and the second inner ring via hole is 6 degrees, the dislocation included angle between the first inner ring via hole and the third inner ring via hole is 4 degrees, and the dislocation included angle between the first inner ring via hole and the outer ring via hole is 2 degrees; the annular winding portion 21 is provided with copper foil traces which sequentially and continuously pass through all the vias to the last inner ring via 217 from the first outer ring via 211 to the last inner ring via 217 in a counter-clockwise direction in order from small to large in offset included angles with the first outer ring via 211 in a one-to-one spacing manner, specifically: the first outer ring via hole 211 is connected with the first inner ring via hole 212 through the top copper foil wire, the first inner ring via hole 212 is connected with the outer ring via hole 213 through the bottom copper foil wire, the outer ring via hole 213 is connected with the second inner ring via hole 214 through the top copper foil wire, the second inner ring via hole 214 is connected with the outer ring via hole 215 through the bottom copper foil wire, the outer ring via hole 215 is connected with the third inner ring via hole 216 through the top copper foil wire, the outer ring via hole is connected to the last inner ring via hole 217 according to the rule of the wire, the interconnected copper foil wires form a series of radial sections serving as the main body part of the annular winding part 21, the radial sections connected to the same inner ring via hole are vertically symmetrical, the straight lines of the radial sections on the same layer are intersected on the central axis of the concentric circles, and the radial included angle between the adjacent two radial sections is 4 degrees; the copper foil trace further includes a round loop 218 disposed in a clockwise direction from the last inner ring via 217 at the bottom layer immediately adjacent to the outer ring via.
As shown in fig. 2 and 3, the rogowski coil printed circuit board further includes an interface portion 22 provided to protrude the annular winding portion 21, including a first pad 221 and a second pad 222 as output ends of the rogowski coil printed circuit board. The first bonding pad 221 is disposed on the top layer of the rogowski coil printed circuit board and connected to the first outer ring via hole 211; the second pad 222 is disposed on the bottom layer of the rogowski coil printed circuit board and is connected to the terminal of the circular loop 218.
Fig. 4 shows another routing method of the rogowski coil printed circuit board, which is different from fig. 3 as follows: the first outer ring via 211 is connected with the first inner ring via 212 through a bottom copper foil trace, the first inner ring via 212 is connected with the outer ring via 213 through a top copper foil trace, the outer ring via 213 is connected with the second inner ring via 214 through a bottom copper foil trace, the second inner ring via 214 is connected with the outer ring via 215 through a top copper foil trace, the outer ring via 215 is connected with the third inner ring via 216 through a bottom copper foil trace, and the outer ring via 213 is connected to the last inner ring via 217 according to the trace rule; a round loop 218 arranged in a clockwise direction starting from the last inner ring via 217 is located immediately above the outer ring via; the first bonding pad 221 is disposed on the bottom layer of the rogowski coil printed circuit board and connected to the first outer ring via hole 211; the second pad 222 is disposed on the top layer of the rogowski coil printed circuit board and is connected to the terminal of the circular return wire 218.
As shown in fig. 5, the rogowski coil current transformer 2 of another embodiment is formed by closely stacking 2 identical rogowski coil printed circuit boards i and ii up and down along the same central axis, which is certainly not limited to tightly stacking 2 rogowski coil printed circuit boards up and down, but also can be stacked by adopting more rogowski coil printed circuit boards according to actual needs; the surface of the rogowski coil printed circuit board except the first bonding pad and the second bonding pad is coated with insulating paint, the second bonding pad 222 of the rogowski coil printed circuit board I and the first bonding pad 221 of the rogowski coil printed circuit board II are overlapped and welded together, and the first bonding pad 221 of the rogowski coil printed circuit board I and the second bonding pad 222 of the rogowski coil printed circuit board II form an output end of the rogowski coil current transformer 2.
As shown in fig. 6, an insulating sheet 23 may be further disposed between the annular winding portions of the 2 rogowski coil printed circuit boards, or the second bonding pad 222 of the rogowski coil printed circuit board i and the second bonding pad 222 of the rogowski coil printed circuit board ii may be overlapped and welded together, and the first bonding pad 221 of the rogowski coil printed circuit board i and the first bonding pad 221 of the rogowski coil printed circuit board ii constitute an output terminal of the rogowski coil current transformer.
The rogowski coil printed circuit board can be provided with positioning parts 24, for example, 2 symmetrically arranged positioning holes as shown in fig. 7, and a plurality of rogowski coil printed circuit boards can be overlapped more smoothly by arranging the positioning holes, and can be correspondingly changed as a shell for installing a transformer.
The utility model adopts special via hole and wiring design, can lead the total number of the via holes of the multi-circle inner ring to reach the maximum number of the via holes which can be arranged on the outer ring by arranging the via holes of the multi-circle inner ring in the area close to the inner ring of the PCB under the limit of the same limited PCB size, increases the total number of turns of the PCB Rogowski coil under the condition of ensuring that the ratio of the outer diameter to the inner diameter of the coil is not too small, and improves the mutual inductance. Meanwhile, the scheme of the PCB Rogowski coil current transformer with the proper transformation ratio is provided by freely combining a plurality of Rogowski coil printed boards, the operation is simple, and the applicability is better. Compared with the traditional iron core current transformer, the current measurement range of the Rogowski coil current transformer is wide, and the problem of heavy current saturation is avoided; compared with the traditional wound Rogowski coil current transformer, the Rogowski coil current transformer has the advantages of high precision, good anti-interference performance, low cost, good coil parameter consistency, easiness in mass production and the like.
Claims (7)
1. The Rogowski coil current transformer comprises a group of identical Rogowski coil printed circuit boards, wherein the Rogowski coil printed circuit boards are double-layer printed circuit boards with annular winding parts; the annular winding part is provided with 3 groups of inner ring through holes and one group of outer ring through holes, the number of each group of inner ring through holes is N, the number of the outer ring through holes is 3N, and N is an integer greater than or equal to 2; the 1 st to 3 rd groups of inner ring through holes and the outer ring through holes are uniformly distributed on 4 concentric circles which take the center of the annular winding part as a circle center and have sequentially increased radius, and the dislocation included angles between the first group of inner ring through holes and the second group of inner ring through holes and between the first group of inner ring through holes and the third group of inner ring through holes are 180 degrees/N and 120 degrees/N respectively, wherein the dislocation included angle between any two groups of inner ring through holes is the minimum included angle formed by the connecting lines of all inner ring through holes and the circle center in the two groups of inner ring through holes; the annular winding part is also provided with metal wires which sequentially and continuously pass through all the through holes to the last through hole of the inner ring from the first outer ring through hole in a mode of spacing the outer ring through holes and the inner ring through holes one by one from the first outer ring through hole in order of small to large offset included angles between the two through holes and the circle center, and the metal wires form a series of radial sections serving as the main body part of the annular winding part, wherein the offset included angles between any two through holes refer to included angles between connecting lines of the two through holes and the circle center; the radial sections are uniformly and vertically symmetrically arranged on the top layer and the bottom layer of the double-layer printed circuit board, the straight lines of the radial sections on the same layer are intersected on the central axis of the concentric circle, and the radial included angle between two adjacent radial sections is 120 degrees/N; the metal wiring further comprises a circle of circular loop which is arranged at the vacant position on the top layer or the bottom layer of the double-layer printed circuit board close to the outer ring via hole along the opposite direction of the circumferential wiring of the radial section by taking the last inner ring via hole as a starting point.
2. The rogowski coil current transformer of claim 1, further comprising a first pad and a second pad protruding from the annular winding portion, the first pad and the second pad being disposed on a top layer and a bottom layer of a double-layer printed circuit board, respectively, in a vertically symmetrical manner, the first pad being connected to the first outer ring via hole, and the second pad being connected to a terminal end of the circular loop.
3. The rogowski coil current transformer according to claim 1, characterized in that it is formed by at least two of said rogowski coil printed circuit boards being stacked up and down tightly along the same central axis.
4. A rogowski coil current transformer according to claim 3, in which an insulating sheet is provided between annular winding portions of adjacent two rogowski coil printed circuit boards.
5. The rogowski coil current transformer of claim 1, wherein the rogowski coil printed circuit board is provided with at least one positioning portion in addition to the annular winding portion.
6. A current transformer for a circuit breaker, comprising a rogowski coil current transformer for measurement and a core current transformer for power supply, characterized in that the rogowski coil current transformer is a rogowski coil current transformer according to any one of claims 1 to 5.
7. The current transformer for the circuit breaker of claim 6, wherein the rogowski coil current transformer and the core current transformer are packaged in the same housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321149518.2U CN219738712U (en) | 2023-05-15 | 2023-05-15 | Rogowski coil current transformer and current transformer for circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321149518.2U CN219738712U (en) | 2023-05-15 | 2023-05-15 | Rogowski coil current transformer and current transformer for circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219738712U true CN219738712U (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321149518.2U Active CN219738712U (en) | 2023-05-15 | 2023-05-15 | Rogowski coil current transformer and current transformer for circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219738712U (en) |
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2023
- 2023-05-15 CN CN202321149518.2U patent/CN219738712U/en active Active
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