Three-phase voltage and current measuring module

Abstract

The utility model discloses a three-phase voltage and current measuring module which comprises a first shell, a second shell, an induction electrode, a circuit board and a current mutual inductance coil, the first shell is divided into a semicircular upper clamping ring and a semicircular lower clamping ring, the upper clamping ring and the lower clamping ring form a complete circular ring in a surrounding mode, and the upper clamping ring and the lower clamping ring are hinged to form a clamp type opening and closing structure. The current mutual inductance coils are located in the upper clamping ring and the lower clamping ring respectively, the inner ring face of the first shell and the upper surface of the second shell form a channel capable of containing a cable to be detected, the induction electrode is tightly attached to the upper surface of the second shell, and the circuit board is electrically connected with the induction electrode and the current mutual inductance coils. The circuit board receives signals transmitted by the current mutual inductance coil and the induction electrode and transmits the signals to an external metering terminal. According to the utility model, the function of non-contact induction current and voltage measurement of the three-phase cable is realized, and the measurement safety and convenience are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of line monitoring, in particular to a three-phase voltage and current measurement module. Background Art

[0002] When using existing voltage and current measurement tools, it is required to first turn off the switch, then peel off the wire skin of the cable, and directly contact the wiring head of the measurement tool with the cable itself for measurement. For example, Patent 202122949939.0 discloses a cable-clamping type voltage and current measurement device, which obtains voltage and current by piercing the cable outer skin through a piercing mechanism. Since non-contact induction measurement cannot be achieved, this operation method not only has huge safety hazards, but even causes personal injury and death accidents, and the entire measurement process is quite cumbersome and very inconvenient. Therefore, there is an urgent need to further improve existing voltage and current measurement tools. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a three-phase voltage and current measurement module with non-contact induction measurement.

[0004] The purpose of the utility model is realized by the following technical solutions: A three-phase voltage and current measurement module includes a first housing, a second housing, induction electrodes, a circuit board, and current mutual inductance coils. The first housing is divided into a semi-circular upper clamping ring and a lower clamping ring. The upper clamping ring and the lower clamping ring form a complete ring. The upper clamping ring and the lower clamping ring are hinged into a pliers-like opening and closing structure. The upper clamping ring and the lower clamping ring are both hollow structures. The current mutual inductance coils are respectively located inside the upper clamping ring and the lower clamping ring. The first housing and the second housing are arranged in parallel. The upper surface of the second housing is an arc surface. The inner ring surface of the first housing and the upper surface of the second housing form a channel capable of accommodating a cable to be measured. The induction electrodes and the circuit board are located inside the second housing. The induction electrodes are closely attached to the upper surface of the second housing. The circuit board is electrically connected to the induction electrodes and the current mutual inductance coils. The circuit board receives the signals transmitted by the current mutual inductance coils and the induction electrodes respectively and transmits them to an external metering terminal.

[0005] Further, a pulling hook, a threaded rod, and a hand-tightening screw seat are arranged on the second housing. The threaded rod is vertically located inside the second housing. The hand-tightening screw seat and the pulling hook are respectively located outside the second housing. The hand-tightening screw seat is fixedly connected to the bottom end of the threaded rod. The pulling hook is located directly above the induction electrodes. The threaded rod passes through one end of the pulling hook and is threadedly connected thereto. The threaded rod rotates to drive the pulling hook to move up and down.

[0006] Further, copper foil paper is arranged inside the second housing, and the copper foil paper wraps the circuit board.

[0007] Further, an indicator light is provided on the circuit board, and the indicator light passes through the second housing and displays the working state of the circuit board.

[0008] The utility model has the following advantages: The current mutual inductance coil and the first housing form a current measurement part, and the induction electrode, the circuit board and the second housing form a voltage measurement part. The two are combined to form a current and voltage measurement module, realizing the function of non-contact inductive measurement of current and voltage of three-phase cables, improving the measurement safety and convenience; The cooperation of the pulling hook and the threaded rod can make the cable to be measured closely attached to the induction electrode; The copper foil paper arranged to wrap the whole circuit board can shield the interference of the circuit board, making the calculation result more accurate. Description of the Drawings

[0009] Figure 1 is a front three-dimensional structural schematic diagram of the utility model;

[0010] Figure 2 is a back three-dimensional structural schematic diagram of the utility model;

[0011] Figure 3 is a front view schematic diagram of the utility model after removing the second housing;

[0012] Figure 4 is a rear view schematic diagram of the utility model after removing the first housing;

[0013] Figure 5 is Figure 3 a front view schematic diagram after removing the copper foil paper.

[0014] In the figure, 1. First housing; 2. Second housing; 3. Current mutual inductance coil; 4. Induction electrode; 5. Circuit board; 6. Pulling hook; 7. Threaded rod; 8. Hand-tightening screw seat; 9. Indicator light; 10. Copper foil paper; 11. Upper snap ring; 12. Lower snap ring. Specific Embodiments

[0015] To make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. Usually, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0017] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0018] Such as Figures 1 to 5As shown in the figure, a three-phase voltage and current measurement module includes a first housing 1, a second housing 2, an induction electrode 4, a circuit board 5, a current mutual inductance coil 3, a wire-pulling hook 6, a threaded rod 7, a hand-tightening screw seat 8, and a copper foil 10. The first housing 1 and the second housing 2 are arranged side by side. The first housing 1 is divided into a semi-circular upper clamping ring 11 and a lower clamping ring 12. The upper clamping ring 11 and the lower clamping ring 12 enclose a complete ring. One end of the upper clamping ring 11 and the lower clamping ring 12 is connected by a rotating shaft to form a clamp-type opening and closing structure, and the other end of the upper clamping ring 11 and the lower clamping ring 12 is connected by a buckle. Both the upper clamping ring 11 and the lower clamping ring 12 are hollow structures, and the current mutual inductance coils 3 are respectively located inside the upper clamping ring 11 and the lower clamping ring 12. The upper surface of the second housing 2 is an arc surface. The lower ends of the first housing 1 and the second housing 2 are integrally connected. The inner ring surface of the first housing 1 and the upper surface of the second housing 2 form a channel capable of accommodating a cable to be measured. The induction electrode 4 and the circuit board 5 are located inside the second housing 2. The induction electrode 4 is an arc-shaped sheet structure. The induction electrode 4 is arranged in a card slot and closely adheres to the upper surface of the second housing 2. The threaded rod 7 is also vertically located inside the second housing 2 through the card slot. The hand-tightening screw seat 8 and the wire-pulling hook 6 are respectively located outside the second housing 2. The hand-tightening screw seat 8 is inserted into the bottom end of the threaded rod 7. The wire-pulling hook 6 is located directly above the induction electrode 4. The threaded rod 7 passes through one end of the wire-pulling hook 6 and is threadedly connected thereto. The second housing 2 extends upward to form a semi-enclosed housing for the threaded rod 7. This housing forms a long strip-shaped slot that restricts the movement of the wire-pulling hook 6. One end of the wire-pulling hook 6 is located inside this long strip-shaped slot. The threaded rod 7 rotates to drive the wire-pulling hook 6 to move up and down along the long strip-shaped slot. The copper foil 10 is located inside the second housing 2. The copper foil 10 wraps the entire circuit board 5 to shield interference. An indicator light 9 is provided on the circuit board 5. The indicator light 9 passes through the copper foil 10 and the second housing 2 and displays the working state of the circuit board 5. Once the voltage and current measurement module is normally put into operation, the indicator light will flash. The current mutual inductance coil 3 can convert the primary large current into a secondary small current for output, which is convenient for acquisition and calculation. The circuit board 5 is electrically connected to the current mutual inductance coil 3 and the induction electrode 4 respectively. The circuit board 5 receives the signals transmitted by the current mutual inductance coil 3 and the induction electrode 4 respectively and transmits them to an external metering terminal. The metering terminal is an existing device that can be commercially purchased. When in use, the output wires on the circuit board 5 are inserted into the metering module of the metering terminal. The current sensed by the current mutual inductance coil 3 is directly output to the metering terminal through the output wires. The metering terminal realizes the reading of the voltage data stored in the single-chip microcomputer. Among them, there are two output wires. One 8p is used for communication with the single-chip microcomputer, and one 6p is used for transmitting current signals, and they are respectively inserted into the corresponding interfaces of the metering module.

[0019] Working principle of the utility model: When in use, open the buckle of the upper clamping ring and the lower clamping ring, and clamp the device on the three-phase cable to be measured. The induction electrode in the voltage measurement module senses the voltage signal and transmits it to the single-chip microcomputer on the circuit board. The single-chip microcomputer converts the analog signal into a digital signal, calculates the voltage value through the calculation of the digital signal, stores the calculation result inside the single-chip microcomputer, and waits for the metering module on the metering terminal to read it. At the same time, the current mutual inductance coil on the cable to be measured is directly connected to the metering module of the metering terminal through the output line, and the metering module calculates the current magnitude of the current cable. The two cooperate to achieve the function of non-contact inductive measurement of current and voltage; the operator rotates the hand-tightening screw seat to drive the threaded rod to rotate, and the threaded rod drives the pulling hook to move downward. The pulling hook will adjust the distance between the cable to be measured and the induction electrode to make the two fit more closely; the circuit board is wrapped with copper foil paper, which can shield the interference of the circuit board and make the calculation result more accurate.

[0020] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A three-phase voltage and current measurement module, characterized in that: The invention comprises a first shell (1), a second shell (2), an induction electrode (4), a circuit board (5), and a current mutual induction coil (3); the first shell (1) is divided into a semi-circular upper clamp ring (11) and a lower clamp ring (12); the upper clamp ring (11) and the lower clamp ring (12) form a complete circular ring; the upper clamp ring (11) and the lower clamp ring (12) are hinged to form a clamp-type opening and closing structure; the upper clamp ring (11) and the lower clamp ring (12) are both hollow structures; the current mutual induction coil (3) is respectively located in the upper clamp ring (11) and the lower clamp ring (12); the first shell (1) and the second shell (2) are respectively connected to each other. The first shell (1) and the second shell (2) are arranged in parallel, the upper surface of the second shell (2) is an arc-shaped surface, the inner annular surface of the first shell (1) and the upper surface of the second shell (2) form a channel capable of accommodating a cable to be tested, the induction electrode (4) and the circuit board (5) are located in the second shell (2), the induction electrode (4) is closely attached to the upper surface of the second shell (2), the circuit board (5) is electrically connected to the current mutual induction coil (3) and the induction electrode (4), respectively, and the circuit board (5) receives the signals transmitted by the induction electrode (4) and the current mutual induction coil (3) and transmits them to an external metering terminal.

2. A three-phase voltage and current measurement module according to claim 1, characterized in that: The second shell (2) is provided with a wire pulling hook (6), a threaded rod (7), and a hand screw seat (8); the threaded rod (7) is vertically located in the second shell (2); the hand screw seat (8) and the wire pulling hook (6) are respectively located outside the second shell (2); the hand screw seat (8) is fixedly connected to the bottom end of the threaded rod (7); the wire pulling hook (6) is located directly above the sensing electrode (4); the threaded rod (7) passes through one end of the wire pulling hook (6) and is threadedly connected thereto; the threaded rod (7) rotates to drive the wire pulling hook (6) to move up and down.

3. A three-phase voltage and current measurement module according to claim 1, characterized in that: Copper foil paper (10) is arranged in the second shell (2), and the copper foil paper (10) wraps the circuit board (5).

4. A three-phase voltage and current measurement module according to claim 1, characterized in that: An indicator light (9) is provided on the circuit board (5); the indicator light (9) passes through the second housing (2) and displays the working status of the circuit board (5).

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