A metering current transformer with a fault indication function

Abstract

The utility model discloses a kind of fault indicating function's measurement current transformer, belong to current transformer technical field. Including through core type current transformer, the outside of through core type current transformer is equipped with detection box, the inside of detection box is equipped with circuit board, microprocessor, current sensor, voltage sensor, magnetic flux sensor are integrated on the circuit board, the circuit board and through core type current transformer are electrically connected, the current sensor, voltage sensor, magnetic flux sensor respectively detect the data of through core type current transformer secondary current, secondary voltage, core magnetic flux saturation, the outside of detection box is equipped with three groups display different color LED lamp, the LED lamp is electrically connected with circuit board, microprocessor inside is preset with judgment program and control instruction;The technical scheme realizes the real-time monitoring of measurement current transformer operating state and the purpose of intuitive indication of fault.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, specifically a metering current transformer with fault indication function. Background Technology

[0002] Current transformers, as crucial measuring devices in power systems, convert large currents into smaller ones for metering, protection, and control operations. During actual operation, current transformers may experience various faults, such as winding short circuits, open circuits, and core saturation. However, most existing metering current transformers lack effective fault indication functions. When faults occur, it is difficult for staff to detect and locate the problem in a timely manner. This not only affects the normal operation of the power system but may also lead to serious consequences such as equipment damage and power outages.

[0003] Traditional current transformer monitoring methods mainly rely on manual periodic inspections, which are inefficient and have a certain lag, making it impossible to grasp the operating status of current transformers in real time. Utility Model Content

[0004] The purpose of this invention is to provide a current transformer with fault indication function to solve the problems mentioned in the background art.

[0005] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0006] A metering current transformer with fault indication function includes a through-type current transformer. A detection box is installed on the outside of the through-type current transformer, and a circuit board is installed inside the detection box. The circuit board integrates a microprocessor, a current sensor, a voltage sensor, and a magnetic flux sensor. The circuit board is electrically connected to the through-type current transformer. The current sensor, voltage sensor, and magnetic flux sensor respectively detect the secondary current, secondary voltage, and core magnetic flux saturation data of the through-type current transformer. Three sets of LEDs displaying different colors are installed on the outside of the detection box. Each LED is electrically connected to the circuit board. The microprocessor has a preset judgment program and control instructions to achieve accurate monitoring of various operating parameters of the through-type current transformer. The fault is intuitively displayed by the different colored LEDs, which facilitates the staff to quickly determine the fault type and improves the efficiency of fault diagnosis.

[0007] Furthermore, the connection method between the microprocessor and the current sensor and voltage sensor is referenced to the electrical experimental apparatus and system with announcement number CN106847026B, and the connection method between the microprocessor and the magnetic flux sensor is referenced to the online detection device for inter-turn short circuit of generator rotor winding with announcement number CN201535810U.

[0008] Furthermore, the through-hole current transformer includes a housing with a perforation at its center. An iron core is installed inside the housing, and a secondary winding is wound around the outside of the iron core. The secondary winding is electrically connected to the circuit board. The housing protects the internal components, and the perforation facilitates the passage of the conductor being tested, enabling the induction of large currents. The iron core enhances the electromagnetic induction effect, and the secondary winding converts the induced electromagnetic signal into an electrical signal, which is then output to the circuit board for further processing, ensuring the normal operation of the transformer.

[0009] Furthermore, a bracket is installed on the bottom surface of the housing, and a pair of first through holes are provided on the bottom surface of the housing. A pair of second through holes are provided on the top surface of the bracket. The first through holes and the second through holes are connected. The two free ends of the secondary winding pass through the pair of first through holes and the pair of second through holes respectively, which facilitates the lead-out and connection of the secondary winding. At the same time, the bracket plays the role of supporting and fixing the current transformer, making the current transformer installation more stable and ensuring the accuracy and stability of the measurement.

[0010] Furthermore, the iron core is ring-shaped, which can effectively improve electromagnetic induction efficiency, reduce magnetic leakage, and make the measurement accuracy of the transformer higher, thus improving the accuracy of measurement.

[0011] Furthermore, the bracket has a pair of fixing holes, which facilitate the use of bolts or other connectors to securely install the current transformer on the equipment, ensuring stable operation of the current transformer in complex power environments and avoiding the impact of shaking or displacement on measurement accuracy.

[0012] Furthermore, the detection box is made of insulating material to prevent the electronic components inside the detection box from being affected by external electromagnetic interference, and at the same time to avoid the detection box being electrified and causing safety hazards to the operators, thus ensuring the safety of equipment and personnel.

[0013] Furthermore, the iron core and the perforation are arranged coaxially to ensure that the magnetic field generated by the conductor under test can act uniformly on the iron core, making the electromagnetic induction more uniform and stable, and improving the accuracy and reliability of the transformer measurement.

[0014] Compared with existing technologies, the advantages of this invention are: this metering current transformer with fault indication function enables real-time monitoring of the operating status of the metering current transformer and intuitive indication of faults. When a fault occurs, staff can quickly determine the fault type based on the indicator light color and display screen information, thereby enabling timely implementation of appropriate measures, shortening fault handling time, and improving the reliability and stability of the power system. Attached Figure Description

[0015] Figure 1 This is a first three-dimensional structural schematic diagram of a metering current transformer with fault indication function disclosed in an embodiment of the present utility model.

[0016] Figure 2 This is a second three-dimensional structural diagram of a metering current transformer with fault indication function disclosed in an embodiment of the present utility model.

[0017] Figure 3 This is a first cross-sectional structural diagram of a metering current transformer with fault indication function disclosed in an embodiment of the present utility model.

[0018] Figure 4 This is a second cross-sectional structural diagram of a metering current transformer with fault indication function disclosed in an embodiment of this utility model.

[0019] In the diagram: 1. Outer shell; 2. Perforation; 3. Bracket; 4. Fixing hole; 5. Detection box; 6. LED light; 7. Secondary winding; 8. Current sensor; 9. Voltage sensor; 10. Flux sensor; 11. Microprocessor; 12. Iron core. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-4 This utility model provides a technical solution: a metering current transformer with fault indication function, a through-type current transformer, a detection box 5 installed on the outside of the through-type current transformer, a circuit board installed inside the detection box 5, a microprocessor 11, a current sensor 8, a voltage sensor 9, and a magnetic flux sensor 10 integrated on the circuit board, the circuit board and the through-type current transformer are electrically connected, the current sensor 8, the voltage sensor 9, and the magnetic flux sensor 10 respectively detect the secondary current, secondary voltage, and core magnetic flux saturation data of the through-type current transformer, three sets of LEDs 6 displaying different colors are installed on the outside of the detection box 5, the LEDs 6 are all electrically connected to the circuit board, the microprocessor 11 has a preset judgment program and control instructions, the current sensor 8 detects the secondary current, the voltage sensor 9 detects the secondary voltage, and the magnetic flux sensor 10 detects the core magnetic flux saturation data, the detected data is transmitted to the microprocessor 11 in real time. The microprocessor 11 compares and analyzes the collected data with the normal operating data range according to the preset judgment program. Once the data is found to be outside the normal range, the corresponding LED 6 is controlled to light up according to the control command. Different colors represent different fault types, such as red for current and yellow for voltage.

[0022] As one embodiment of this utility model, the through-hole current transformer includes a housing 1 with a through hole 2 at its center. An iron core 12 is installed inside the housing 1, and a secondary winding 7 is wound around the outside of the iron core 12. The secondary winding 7 is electrically connected to the circuit board. When the conductor being tested passes through the through hole 2, the large current in the conductor generates an alternating magnetic field around the iron core 12, which in turn strengthens this magnetic field. According to the principle of electromagnetic induction, the secondary winding 7 generates an induced electromotive force under the action of the alternating magnetic field, thereby converting the large current into a small current signal output, which is then transmitted to the sensors on the circuit board for detection.

[0023] In one embodiment of this utility model, a bracket 3 is further installed on the bottom surface of the housing 1. The bottom surface of the housing 1 has a pair of first through holes, and the top surface of the bracket 3 has a pair of second through holes. The first and second through holes are connected. The two free ends of the secondary winding 7 pass through the pair of first and second through holes respectively, and the free ends of the secondary winding 7 exit through the first and second through holes, facilitating connection with the circuit board for signal transmission. The bracket 3 is installed on the bottom surface of the housing 1, and its fixing hole 4 can be used to install the current transformer in a designated position, ensuring that the current transformer will not shift during operation, guaranteeing the stability of electromagnetic induction, and thus ensuring the accuracy of the measurement data.

[0024] As an embodiment of this utility model, the iron core 12 is further ring-shaped. The ring structure makes the magnetic field distribution more uniform. When the current in the conductor being measured generates an alternating magnetic field, the ring-shaped iron core 12 can better converge and guide the magnetic field, reduce magnetic field leakage, and enable the secondary winding 7 to more effectively sense changes in the magnetic field, improve the stability and accuracy of the induced electromotive force, thereby improving the measurement accuracy of the transformer.

[0025] As an embodiment of this utility model, the bracket 3 further has a pair of fixing holes 4. By passing the bolt through the fixing holes 4 and tightening it with the corresponding threaded hole on the mounting device, the current transformer can be fixed in the designated position, ensuring that the current transformer remains stable during operation and will not move due to external forces, thus ensuring that its internal electromagnetic induction process is not disturbed and maintaining the accuracy of the measurement.

[0026] As one embodiment of this utility model, the detection box 5 is further made of insulating material. This insulating material effectively isolates external electromagnetic fields, reducing interference to electronic components such as the microprocessor 11, current sensor 8, voltage sensor 9, and magnetic flux sensor 10 on the circuit board inside the detection box 5, ensuring the accuracy of the sensor data acquisition and the stability of the data processed by the microprocessor 11. Simultaneously, even if abnormal conditions such as leakage occur inside the transformer, the insulating material of the detection box 5 can prevent current from being conducted to the outside, protecting the personal safety of the operators.

[0027] As an embodiment of this utility model, the iron core 12 and the through hole 2 are further arranged coaxially. When the iron core 12 and the through hole 2 are arranged coaxially, after the conductor under test passes through the through hole 2, the alternating magnetic field generated by it can act on the iron core 12 in a symmetrical manner, so that the magnetic field intensity of each part of the iron core 12 is the same, thereby generating a more stable and uniform induced electromotive force on the secondary winding 7, improving the accuracy and reliability of the current measurement of the transformer.

[0028] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a control cabinet. The control circuits of the mold temperature controller, temperature controller, water pump, pump, solenoid valve, heater, generator, condenser, absorber and evaporator can be implemented by simple programming by those skilled in the art, which is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.

Claims

1. A metering current transformer having a fault indication function, characterized by The device includes a through-type current transformer. A detection box (5) is installed on the outside of the through-type current transformer. A circuit board is installed inside the detection box (5). A microprocessor (11), a current sensor (8), a voltage sensor (9), and a magnetic flux sensor (10) are integrated on the circuit board. The circuit board is electrically connected to the through-type current transformer. The current sensor (8), voltage sensor (9), and magnetic flux sensor (10) detect the secondary current, secondary voltage, and core magnetic flux saturation data of the through-type current transformer, respectively. Three sets of LEDs (6) displaying different colors are installed on the outside of the detection box (5). The LEDs (6) are all electrically connected to the circuit board. The microprocessor (11) has a preset judgment program and control instructions.

2. The metering current transformer with a fault indication function according to claim 1, characterized in that, The through-hole current transformer includes a housing (1), with a through hole (2) at the center of the housing (1), an iron core (12) installed inside the housing (1), and a secondary winding (7) wound around the outside of the iron core (12), and the secondary winding (7) is electrically connected to the circuit board.

3. A metering current transformer with a fault indication function according to claim 2, characterized in that, The bottom surface of the outer shell (1) is equipped with a bracket (3). The bottom surface of the outer shell (1) is provided with a pair of first through holes, and the top surface of the bracket (3) is provided with a pair of second through holes. The first through holes and the second through holes are connected. The two free ends of the secondary winding (7) pass through the pair of first through holes and the second through holes respectively.

4. The metering current transformer with a fault indication function according to claim 2, characterized in that, The iron core (12) is ring-shaped.

5. The instrument current transformer with a fault indication function according to claim 3, characterized in that, The bracket (3) has a pair of fixing holes (4).

6. The power current transformer with a fault indication function according to claim 1, characterized in that, The detection box (5) is made of insulating material.

7. The instrument current transformer with fault indication function according to claim 2, characterized in that, The iron core (12) and the perforation (2) are arranged on the same axis.

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