Open-close type alternating current and direct current mutual inductor

Abstract

The utility model provides an open-close type alternating current and direct current mutual inductor which comprises an upper semi-annular shell and a lower semi-annular shell which are connected with each other in an involution mode. At least three semicircular frameworks with the same size are arranged in each of the upper semicircular shell and the lower semicircular shell, magnetic cores are embedded in the frameworks, induction coils are wound on the peripheries of the frameworks, and the frameworks are horizontally stacked and connected in series through optical shafts to form a closed semicircular magnetic core; the winding directions of the induction coils wound by the closed semi-annular magnetic core arranged in the upper semi-annular shell and the closed semi-annular magnetic core arranged in the lower semi-annular shell are opposite, and the upper semi-annular shell and the lower semi-annular shell are oppositely combined to form two closed semi-annular magnetic cores which are arranged at an interval; one end of the upper semi-annular shell is rotationally connected with one end of the lower semi-annular shell through a hinge to achieve opening and closing. The zero-flux mutual inductor solves the problems that the interior of the zero-flux mutual inductor in the prior art cannot be opened, and the interior of the zero-flux mutual inductor is inconvenient to maintain and check.

Description

Technical Field

[0001] The utility model relates to the technical field of mutual inductors, in particular to a split-type AC / DC mutual inductor. Background Art

[0002] An AC / DC transformer is a transformer used to measure alternating current and direct current. It usually consists of an iron core and windings. The function of an AC / DC transformer is to convert AC or DC into measurable voltage or current signals. By measuring these signals, we can understand the current and voltage in the circuit, so as to perform applications such as energy metering, protection and control. AC / DC transformers are widely used in power systems, industrial automation and energy metering.

[0003] Existing AC and DC transformers are generally of an integrated type and cannot be opened internally, which is inconvenient during use and difficult to repair and inspect internally. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a split type AC / DC transformer to solve the problem in the prior art that the interior of the zero flux transformer cannot be opened, making it inconvenient to repair and inspect the interior.

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a split type AC / DC transformer, comprising an upper semi-annular housing and a lower semi-annular housing connected to each other, wherein the middle position of the upper semi-annular housing and the lower semi-annular housing after being connected to each other forms a gap for the current line to pass through;

[0006] At least three semi-annular frames of the same size are arranged in the upper semi-annular shell and the lower semi-annular shell, a magnetic core is embedded in the frame, and an induction coil is wound around the outer periphery of the frame, the frames are stacked horizontally with each other and connected in series through an optical axis to form a closed semi-annular magnetic core, the closed semi-annular magnetic core is sleeved in the outer frame and an induction coil is wound around the outer periphery, the induction coils wound by the closed semi-annular magnetic core arranged in the upper semi-annular shell and the closed semi-annular magnetic core arranged in the lower semi-annular shell are wound in opposite directions, and the upper semi-annular shell and the lower semi-annular shell are matched to form two closed annular magnetic cores arranged at intervals;

[0007] One end of the upper semi-annular shell is rotatably connected to one end of the lower semi-annular shell through a hinge, and the other end of the upper semi-annular shell and the other end of the lower semi-annular shell are both provided with arched connecting blocks, and the two arched connecting blocks are connected by captive bolts.

[0008] Wherein, the induction coils on the frame and the outer frame are independently wound enameled coils.

[0009] Among them, a connecting base plate is arranged at the bottom of the lower semi-annular shell, a circuit board is arranged inside the connecting base plate, the input end of the circuit board is welded to the output end of the induction coil, and the induction coil outputs the signal after amplifying the collected current signal through the circuit board operation.

[0010] Among them, the circuit board is connected with a terminal for outputting the current signal after the circuit board operation amplification. The terminal is arranged at the bottom of the lower semi-circular shell and connected to an external power supply to provide power for the mutual inductor.

[0011] The circuit board is also connected with a potentiometer, which is arranged at the bottom of the lower semi-circular shell and is used to adjust the problem of zero-point drift generated by the mutual inductor itself on current signal collection.

[0012] Wherein, shell cover plates are arranged on the upper semi-annular shell and the lower semi-annular shell.

[0013] Wherein, the magnetic core is a Permalloy magnetic core, which has good anti-magnetic and anti-interference properties and high measurement accuracy.

[0014] The beneficial effects of the above technical solution of the utility model are as follows:

[0015] The utility model detects the current by stacking three semi-annular magnetic cores of the same size to form a pair of closed annular magnetic cores, and adopts a Permalloy magnetic core with good anti-magnetic and anti-interference properties as the magnetic core, with high measurement accuracy, ensuring that a lower current can be detected. At the same time, the opening and closing structure cooperates with each other through hinge rotation and non-loose bolts, is easy to use, reasonably designed, and can be opened and closed to facilitate internal inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view structural diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the skeleton in the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the external skeleton in the utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the utility model;

[0020] Figure 5 It is a schematic diagram of the internal structure of the utility model in the opened state.

[0021] Description of reference numerals:

[0022] 1. Upper semi-circular shell; 2. Lower semi-circular shell; 3. Frame; 4. Magnetic core; 5. Optical axis; 6. External frame; 7. Arched connecting block; 8. Captive bolts; 9. Upper shell cover; 10. Lower shell cover; 11. Lead terminals; 12. Connecting base plate; 13. Circuit board; 14. Potentiometer; 15. Signal light. DETAILED DESCRIPTION

[0023] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1-Figure 5 As shown, an embodiment of the utility model provides a split type AC / DC transformer, comprising an upper semi-circular housing 1 and a lower semi-circular housing 2 which are connected to each other, wherein a gap is formed in the middle position after the upper semi-circular housing 1 and the lower semi-circular housing 2 are connected to each other, and a current line passes through;

[0025] At least three semi-annular skeletons 3 of the same size are arranged in the upper semi-annular shell 1 and the lower semi-annular shell 2, a magnetic core 4 is embedded in the skeleton 3, and an induction coil is wound around the outer periphery of the skeleton 3, each skeleton 3 is stacked horizontally with each other and connected in series through an optical axis 5 to form a closed semi-annular magnetic core, the closed semi-annular magnetic core is sleeved in an outer skeleton 6 and an induction coil is wound around the outer periphery, the induction coils on the skeleton 3 and the outer skeleton 6 are independently wound enameled coils, the induction coils wound by the closed semi-annular magnetic core arranged in the upper semi-annular shell 1 and the closed semi-annular magnetic core arranged in the lower semi-annular shell 2 are wound in opposite directions, and the upper semi-annular shell 1 and the lower semi-annular shell 2 are matched to form two closed annular magnetic cores arranged at intervals.

[0026] When current passes through the closed semi-annular magnetic core arranged in the upper semi-annular shell 1, the generated magnetic field is transmitted to the closed semi-annular magnetic core arranged in the lower semi-annular shell 2 through the magnetic core, thereby inducing a voltage signal in the closed semi-annular magnetic core arranged in the lower semi-annular shell 2. This induced voltage signal is proportional to the current passing through the closed semi-annular magnetic core arranged in the upper semi-annular shell 1, thereby realizing the measurement of current.

[0027] One end of the upper semi-annular shell 1 is rotatably connected to one end of the lower semi-annular shell 2 via a hinge, and the other end of the upper semi-annular shell 1 and the other end of the lower semi-annular shell 2 are both provided with an arched connecting block 7, and the two arched connecting blocks 7 are connected by a captive bolt 8, and the lower semi-annular shell 2 is rotated by the hinge structure to realize the upper semi-annular shell 1 opening and closing up and down.

[0028] A connecting bottom plate 12 is provided at the bottom of the lower semi-circular housing 2, and a circuit board 13 is provided inside the connecting bottom plate 12. The input end of the circuit board 13 is welded to the output end of the induction coil, and the induction coil outputs the signal after amplifying the collected current signal through the circuit board operation. The circuit board 13 is connected with a terminal 11, which is used to output the current signal amplified by the circuit board 13. The terminal is arranged at the bottom of the lower semi-circular housing 2 and connected to an external power supply to provide power for the transformer. The circuit board 13 is also connected with a potentiometer 14, which is arranged at the bottom of the lower semi-circular housing 2. The potentiometer 14 can adjust the transformation ratio of the transformer, that is, the proportional relationship between the input current and the output signal. By adjusting the potentiometer 14, the problem of zero drift generated by the transformer itself on the current signal collection can be adjusted.

[0029] The circuit board 13 is also connected to a signal light 15 , which is disposed at the bottom of the lower semi-circular housing 2 and is used to determine whether the mutual inductor is operating normally.

[0030] An upper shell cover plate 9 and a lower shell cover plate 10 are respectively provided on the upper semi-annular shell 1 and the lower semi-annular shell 2 .

[0031] The magnetic core 4 is a Permalloy magnetic core, which has good anti-magnetic and anti-interference properties, and improves the measurement accuracy of the mutual inductor.

[0032] In this embodiment, the working principle of the AC / DC transformer is the same as that of the zero flux transformer, and the innovation of the zero flux transformer is that it combines the magnetic balance principle and magnetic modulation technology, so that the two are organically integrated and have excellent comprehensive performance. The magnetic modulation current sensor is in the iron core excited by the alternating symmetrical voltage or current source. If there is a DC constant magnetic field at the same time, the symmetry of the alternating magnetic flux in the iron core will be destroyed, and the positive and negative half-wave phases of the magnetic flux waveform will change. Correspondingly, the positive and negative half-waves in the output voltage of the detection winding will be relatively displaced. The magnitude and direction of the positive and negative half-wave phase changes can reflect the magnitude and direction of the DC bias current.

[0033] The AC / DC transformer manufactured by adopting the zero flux principle is formed by mutually arranging an upper semi-annular shell and a lower semi-annular shell and a connection structure formed by three semi-annular skeletons of the same size, so that three semi-annular magnetic cores of the same size are stacked and arranged into a pair of closed annular magnetic cores to detect the current, so that the overall structure of the AC / DC transformer is stable. At the same time, the induction coils wound by the closed semi-annular magnetic core arranged in the upper semi-annular shell and the closed semi-annular magnetic core arranged in the lower semi-annular shell are wound in opposite directions, thereby increasing the AC measurement coil, so that the AC / DC transformer not only measures AC and DC at the same time, but also has the characteristics of being less affected by the ambient temperature, extremely high measurement accuracy, wide measurement frequency band, good stability, etc.

[0034] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A split type AC / DC transformer, characterized in that: It comprises an upper semi-annular shell and a lower semi-annular shell which are connected to each other, wherein a gap is formed in the middle of the upper semi-annular shell and the lower semi-annular shell after they are connected to each other, and a gap is formed for the current line to pass through; At least three semi-annular frames of the same size are arranged in the upper semi-annular shell and the lower semi-annular shell, a magnetic core is embedded in the frame, and an induction coil is wound around the outer periphery of the frame, the frames are stacked horizontally with each other and connected in series through an optical axis to form a closed semi-annular magnetic core, the closed semi-annular magnetic core is sleeved in the outer frame and an induction coil is wound around the outer periphery, the induction coils wound by the closed semi-annular magnetic core arranged in the upper semi-annular shell and the closed semi-annular magnetic core arranged in the lower semi-annular shell are wound in opposite directions, and the upper semi-annular shell and the lower semi-annular shell are matched to form two closed annular magnetic cores arranged at intervals; One end of the upper semi-annular shell is rotatably connected to one end of the lower semi-annular shell through a hinge, and the other end of the upper semi-annular shell and the other end of the lower semi-annular shell are both provided with arched connecting blocks, and the two arched connecting blocks are connected by captive bolts.

2. The split type AC / DC transformer according to claim 1, characterized in that: The induction coils on the frame and the outer frame are independently wound enameled coils.

3. The split type AC / DC transformer according to claim 1, characterized in that: A connecting bottom plate is arranged at the bottom of the lower semi-annular shell, a circuit board is arranged inside the connecting bottom plate, and an input end of the circuit board is welded to an output end of the induction coil.

4. The split type AC / DC transformer according to claim 3, characterized in that: The circuit board is connected with a terminal, which is arranged at the bottom of the lower semi-annular shell and connected to an external power supply.

5. The split type AC / DC transformer according to claim 3, characterized in that: The circuit board is also connected with a potentiometer, which is arranged at the bottom of the lower semi-annular shell.

6. The split type AC / DC transformer according to claim 1, characterized in that: The upper semi-annular shell and the lower semi-annular shell are provided with shell cover plates.

7. The split type AC / DC transformer according to claim 1, characterized in that: The magnetic core is a Permalloy magnetic core.

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