Pincer-shaped double-coil automatic calibration current transformer capable of automatically contracting

Abstract

The utility model discloses a pincerlike double-coil automatic calibration current transformer capable of automatically contracting, which comprises an open-close type sensing unit, the bottom of the open-close type sensing unit is connected with an insulating operating rod and a data processing unit, and the open-close type sensing unit comprises a metal shielding shell. An iron core coil, a hollow coil and an integrated automatic contraction mechanism are arranged in the metal shielding shell, the iron core coil is located in the hollow coil so as to enhance the magnetic field coupling effect, and an inner ring of the metal shielding shell is the automatic contraction mechanism capable of being contracted; the sleeves of the iron core coil and the hollow coil can be automatically contracted according to the diameter of the cable, so that an opening air gap is reduced; the iron core coil and the hollow coil are electrically connected with a data processing unit located in the base through shielding cables. The device can monitor the line state in real time, accurately meter electric energy, quickly respond and remove faults, and can efficiently communicate with a master station to realize remote monitoring and management.

Description

Technical Field

[0001] This utility model relates to the field of power system distribution network technology, and in particular to an automatically retractable clamp-on dual-coil automatic calibration current transformer. Background Technology

[0002] Current transformers are crucial monitoring devices in power systems, primarily used to convert high-voltage line current into low voltage for detection, protection, and control. However, existing current transformers, whether traditional iron-core or clamp-on type, suffer from several technical problems. First, the measurement accuracy of clamp-on current transformers is affected by the opening size; an excessively large opening leads to magnetic leakage, reducing measurement accuracy. Second, these transformers typically require periodic manual calibration, which is time-consuming and labor-intensive. Furthermore, they exhibit poor adaptability to conductors of different diameters and present inconveniences during installation and use, sometimes even necessitating circuit disconnection, impacting power system safety and posing safety risks. Therefore, a self-retracting clamp-on dual-coil automatically calibrated current transformer is needed to address these issues. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an automatically retractable clamp-on dual-coil automatic calibration current transformer. The switch integrates functions such as power metering, line protection and communication. It can monitor the line status in real time, accurately measure power, respond quickly and cut off faults, and can also communicate efficiently with the master station to realize remote monitoring and management.

[0004] To achieve the above technical effects, the technical solution adopted by this utility model is as follows: an automatically retractable clamp-on dual-coil automatic calibration current transformer, including an openable sensing unit. An insulating operating rod and a data processing unit are connected to the bottom of the openable sensing unit. The openable sensing unit includes a metal shielding shell. Inside the metal shielding shell are an iron core coil, a hollow coil, and an integrated automatic retraction mechanism. The iron core coil is located inside the hollow coil to enhance the magnetic field coupling effect. The inner ring of the metal shielding shell is a retractable automatic retraction mechanism. Both the iron core coil and the hollow coil's sleeves can automatically retract according to the cable diameter, thereby reducing the air gap. Both the iron core coil and the hollow coil are electrically connected to the data processing unit located in the base via shielded cables.

[0005] Preferably, the openable sensing unit is a two-lobed clamp-shaped structure, with one end hinged and the other end open; the hollow coil wraps around the iron core coil to form a double coil structure.

[0006] Preferably, both the iron core coil and the hollow coil have sleeves in their inner rings. The sleeves are connected to an automatic shrinking mechanism via elastic components, which can adapt to changes in the cable diameter, thereby minimizing the air gap.

[0007] Furthermore, through automatic retraction mechanism control, the opening and closing sensing unit can adapt to changes in cable diameter by opening or closing, and the entire enclosed clamp-shaped dual coil structure ensures that the dual coils are not affected by external magnetic fields during the measurement process.

[0008] Furthermore, the selection of materials and structural design of the inner ring of the metal shielding shell and the inner ring sleeve of the coil ensure that the three remain synchronized during the automatic contraction process, without relative displacement.

[0009] Furthermore, the automatic shrinkage mechanism adjusts in real time during the measurement process to ensure the optimal distance between the coil and the conductor being measured.

[0010] Preferably, the automatic retraction mechanism includes a sensing module, a control module, and a drive module. The sensing module is electrically connected to the control module, and the control module is electrically connected to the drive module. The drive module includes an electric push rod, which is connected to the sleeve.

[0011] Furthermore, the sensor module transmits data to the control module, which parses the sensor data and sends control commands to the drive module. The drive module receives the commands and converts them into mechanical actions of the inner coil sleeve and the inner wall of the outer shell. The sensing unit and the inner wall of the outer shell are adjusted synchronously without changing their relative positions.

[0012] Preferably, the automatic retraction mechanism further includes two sensors for detecting the presence of the cable and triggering the automatic retraction process.

[0013] Preferably, hollow insulators are sleeved on the outside of the insulating operating rod. The hollow insulators have an umbrella-like structure to improve the insulation and anti-pollution ability of the equipment.

[0014] Furthermore, the data processing unit is located on the ground potential side and consists of a signal conditioning module, a digital signal processing module, and a data transmission module connected in sequence. The signal conditioning module receives the values ​​from the sensor and performs preliminary processing such as decoupling, filtering, and analog-to-digital conversion. Then, the digital signal processing module completes self-calibration and cross-calibration. Finally, the data transmission module outputs the automatically calibrated data to the outside world according to the specified communication protocol.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This patent uses a built-in sensor to detect the cable diameter in real time, and in conjunction with the control module and drive module, automatically adjusts the opening size of the clamp-on current transformer to ensure that it matches the cable diameter, minimizes the air gap of the opening, thereby reducing magnetic field leakage and improving measurement accuracy.

[0017] 2. The data processing unit of this patent receives the values ​​output by the sensor from the signal adjustment module and performs preliminary processing such as decoupling, filtering, and analog-to-digital conversion. Then, the digital signal processing module completes self-calibration and cross-calibration. Finally, the data transmission module outputs the automatically calibrated data to the outside world according to the specified communication protocol, thus realizing the automatic calibration function of the signal.

[0018] 3. The dual-coil structure of this patent is encased in a metal shielding shell, and the changes are synchronized, effectively isolating external magnetic field interference, improving the electromagnetic compatibility of the equipment, and ensuring stable measurement performance in complex electromagnetic environments.

[0019] 4. The two semi-annular structures of the patented openable sensor head allow for online installation and removal even when energized. An internal hollow coil encases an iron-core coil, forming a double-coil structure to achieve high magnetic field coupling. A mechanical structure secures the sensor head when closed. This ensures safety and measurement accuracy during live-line work while simplifying the operation process and improving the convenience of on-site operations.

[0020] 5. This patent features automatic shrinkage and calibration, enabling the current transformer to adapt to cables of different specifications without frequent equipment replacement, greatly improving the application range and flexibility of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the current transformer of the present invention;

[0022] Figure 2 A structural block diagram of the integrated automatic contraction mechanism;

[0023] Figure 3 This is a block diagram of the data acquisition and processing unit.

[0024] In the diagram: 1. Metal shielding shell; 2. Hollow coil; 3. Iron core coil; 4. Automatic retraction mechanism; 5. Insulating operating rod; 6. Hollow insulator; 7. Shielded cable; 8. Base; 9. Data processing unit; 10. Integrated sensing unit. Detailed Implementation

[0025] Example 1:

[0026] like Figure 1As shown, an automatically retractable clamp-on dual-coil automatic calibration current transformer includes an openable sensing unit 10. An insulating operating rod 5 and a data processing unit 9 are connected to the bottom of the openable sensing unit 10. The openable sensing unit 10 includes a metal shielding shell 1. Inside the metal shielding shell 1 are an iron core coil 3, a hollow coil 2, and an integrated automatic retraction mechanism 4. The iron core coil 3 is located inside the hollow coil 2 to enhance the magnetic field coupling effect. The inner ring of the metal shielding shell 1 is a retractable automatic retraction mechanism 4. Together with the sleeves of the iron core coil 3 and the hollow coil 2, they can automatically retract according to the cable diameter, thereby reducing the air gap. Both the iron core coil 3 and the hollow coil 2 are electrically connected to the data processing unit 9 located in the base 8 via shielded cables 7.

[0027] Preferably, the openable sensing unit 10 is a two-lobed clamp-shaped structure, with one end hinged and the other end open; the hollow coil 2 wraps around the iron core coil 3 to form a double coil structure.

[0028] Preferably, both the inner rings of the iron core coil 3 and the hollow coil 2 are provided with sleeves, which are connected to the automatic shrinking mechanism 4 through elastic components, and can adapt to changes in the cable diameter, thereby minimizing the air gap.

[0029] Furthermore, controlled by the automatic retraction mechanism 4, the opening and closing sensing unit 10 can adapt to changes in cable diameter by opening or closing, and the entire enclosed clamp-shaped dual coil structure ensures that the dual coils are not affected by external magnetic fields during the measurement process.

[0030] Furthermore, the material selection and structural design of the inner ring of the metal shielding shell 1 and the inner ring sleeve of the coil ensure that the three remain synchronized during the automatic contraction process and do not produce relative displacement.

[0031] Furthermore, the automatic shrinkage mechanism 4 adjusts in real time during the measurement process to ensure the optimal distance between the coil and the conductor being measured.

[0032] Preferably, the automatic retraction mechanism 4 includes a sensing module, a control module, and a drive module. The sensing module is electrically connected to the control module, and the control module is electrically connected to the drive module. The drive module includes an electric push rod, which is connected to the sleeve.

[0033] Furthermore, the sensor module transmits data to the control module, which parses the sensor data and sends control commands to the drive module. The drive module receives the commands and converts them into mechanical actions of the inner coil sleeve and the inner wall of the outer shell. The sensing unit and the inner wall of the outer shell are adjusted synchronously without changing their relative positions.

[0034] Preferably, the automatic retraction mechanism 4 further includes two sensors for detecting the presence of the cable and triggering the automatic retraction process.

[0035] Preferably, the insulating operating rod 5 is fitted with a hollow insulator 6, which has an umbrella-like structure to improve the insulation and anti-pollution capability of the equipment.

[0036] Furthermore, the data processing unit 9 is located on the ground potential side, and it consists of a signal adjustment module, a digital signal processing module, and a data transmission module connected in sequence. The signal adjustment module receives the values ​​from the sensor and performs preliminary processing such as decoupling, filtering, and analog-to-digital conversion. Then, the digital signal processing module completes self-calibration and cross-calibration. Finally, the data transmission module outputs the automatically calibrated data to the outside world according to the specified communication protocol.

[0037] Example 2:

[0038] like Figure 2 The integrated automatic retraction mechanism 4 shown in the diagram primarily comprises built-in sensors. A pair of high-precision non-contact diameter detection sensors are installed on both sides of the jaws of the clamp-type current transformer. These sensors utilize optical principles to accurately measure the cable's outer diameter in real time and feed the signal back to the control module. The control module, equipped with a high-performance microprocessor, receives the data from the sensor group and processes it using a pre-defined algorithm to determine the required adjustment amount of the jaws. The control module outputs precise control signals to instruct the drive module to execute the action. The automatic retraction mechanism 4 achieves synchronous automatic retraction. This system features position feedback to ensure the accuracy and stability of the jaw size adjustment and minimize the air gap.

[0039] like Figure 3 The block diagram of the data acquisition and processing unit shown is illustrated. Data processing unit 9 is located on the ground potential side and consists of a signal conditioning module, a digital signal processing module, and a data transmission module connected sequentially. The signal conditioning module receives the sensor values ​​and performs decoupling and filtering. Subsequently, the signal is converted into a digital signal by a high-precision analog-to-digital converter (ADC) and sent to the digital signal processing module. The digital signal processing module uses self-calibration and cross-calibration algorithms to process the converted digital signal. Self-calibration includes zero-point calibration, range calibration, and temperature compensation, while cross-calibration ensures signal consistency between the two coils. Finally, the data transmission module encapsulates the automatically calibrated and processed data according to a predetermined communication protocol (IEC 61850) and transmits it to an external monitoring system via a serial communication interface.

Claims

1. An automatically retractable clamp-on dual-coil automatic calibration current transformer, comprising an openable sensing unit (10), wherein an insulating operating rod (5) and a data processing unit (9) are connected to the bottom of the openable sensing unit (10), characterized in that, The openable sensing unit (10) includes a metal shielding shell (1), inside which are arranged an iron core coil (3), a hollow coil (2) and an integrated automatic retraction mechanism (4). The iron core coil (3) is located inside the hollow coil (2), and the inner ring of the metal shielding shell (1) is a retractable automatic retraction mechanism (4). The iron core coil (3) and the hollow coil (2) are both electrically connected to the data processing unit (9) located in the base (8) through shielded cables (7).

2. The automatically retractable clamp-on dual-coil automatic calibration current transformer according to claim 1, characterized in that, The opening and closing sensing unit (10) is a two-lobed clamp structure with one end hinged and the other end open; the hollow coil (2) wraps the iron core coil (3) to form a double coil structure.

3. The automatically retractable clamp-on dual-coil automatic calibration current transformer according to claim 1, characterized in that, Both the inner rings of the iron core coil (3) and the hollow coil (2) are provided with sleeves, which are connected to the automatic retraction mechanism (4) through elastic components.

4. The automatically retractable clamp-on dual-coil automatic calibration current transformer according to claim 3, characterized in that, The automatic retraction mechanism (4) includes a sensing module, a control module and a drive module. The sensing module is electrically connected to the control module, and the control module is electrically connected to the drive module. The drive module includes an electric push rod, which is connected to the sleeve.

5. The automatically retractable clamp-on dual-coil automatic calibration current transformer according to claim 4, characterized in that, The automatic retraction mechanism (4) also includes two sensors for detecting the presence of the cable and triggering the automatic retraction process.

6. The automatically retractable clamp-on dual-coil automatic calibration current transformer according to claim 1, characterized in that, The insulating operating rod (5) is fitted with a hollow insulator (6), which has an umbrella-like structure.

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