A self-monitoring current transformer

Abstract

This utility model discloses a self-monitoring current transformer. Its key technical features include a transformer body and a housing. The transformer body senses the main cable current and outputs a first current signal. A secondary transformer is connected to the transformer body. The secondary transformer senses and measures the main cable current and outputs a second current signal. The secondary transformer is equipped with a calculation module. This module receives the first and second current signals and performs calculations using preset parameters to obtain the real-time operating error of the transformer body. This utility model uses the calculation module to calculate the second current signal output by the secondary transformer and the first current signal output by the transformer body in real time. By observing the changes in the calculated values, the operating status information of the transformer body can be obtained, thereby achieving predictive maintenance.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, and more specifically to a self-monitoring current transformer. Background Technology

[0002] Currently, current transformers are instruments that measure current by converting a large primary current into a small secondary current based on the principle of electromagnetic induction. They are commonly used for current monitoring in high-voltage power grids (substations, transmission lines), relay protection, power metering, and real-time monitoring of high-current industrial equipment (such as electric furnaces and motors).

[0003] However, the existing technologies mentioned above still have some drawbacks. Current transformers installed outdoors may experience changes in core permeability and winding resistance due to long-term use in the outdoor environment, causing drift in ratio / phase difference and resulting in data distortion. Furthermore, traditional current transformers cannot detect their own aging (core loss, etc.) and can only rely on periodic manual verification. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the present invention provides a self-monitoring current transformer.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a current transformer body and a housing. The current transformer body is used to sense the main cable current and output a first current signal. The current transformer body is connected to a secondary current transformer, which is used to sense and measure the main cable current and output a second current signal. The secondary current transformer is equipped with a calculation module, which is used to receive the first current signal and the second current signal, and perform calculations using preset parameters to obtain the real-time operating error of the current transformer body.

[0006] The present invention is further configured such that: the secondary current transformer is provided with a communication module, which is used to wirelessly transmit the calculation results of the calculation module and the data of the first current signal and the second current signal to an external device.

[0007] The present invention is further configured such that: the secondary current transformer is provided with a power supply module, which charges the secondary current transformer through the induction circuit and provides working power to the arithmetic module and the communication module.

[0008] The present invention is further configured such that: the power supply module is connected to the computing module and is used to output its charging status to the computing module.

[0009] The present invention is further configured such that: the transformer body and the secondary transformer are detachably connected and connected by a connecting rope; the transformer body is provided with a mounting base, and the secondary transformer is provided with a mounting protrusion adapted to the mounting base.

[0010] The present invention is further configured such that the housing has an outdoor protection rating of not less than IP65.

[0011] In summary, this utility model has the following beneficial effects: the second current signal output by the secondary transformer and the first current signal output in real time by the transformer body are calculated by the calculation module. The working status information of the transformer body can be obtained by the change of the calculated value. The working status information is output to external devices through the communication module, so that the transformer body can be predictively maintained. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0013] Figure 2 This is a partial sectional view of this embodiment;

[0014] Figure 3 This is a schematic diagram illustrating the operation of this embodiment;

[0015] Reference numerals in the attached drawings: 1. Current transformer body; 11. Mounting base; 2. Secondary current transformer; 21. Mounting protrusion; 3. Operation module; 4. Communication module; 5. Power supply module; 6. Connecting rope. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] This embodiment discloses a self-monitoring current transformer, such as... Figures 1 to 3 As shown, the device includes a current transformer body 1 and a housing. The current transformer body 1 is used to sense the current of the main cable and output a first current signal. The current transformer body 1 is connected to a secondary current transformer 2. The secondary current transformer 2 is used to sense and measure the current of the main cable and output a second current signal. The secondary current transformer 2 is equipped with a calculation module 3. The calculation module 3 is used to receive the first current signal and the second current signal, and perform calculations through preset parameters to obtain the real-time operating error of the current transformer body 1.

[0018] Furthermore, the secondary current transformer 2 is equipped with a communication module 4. This module wirelessly transmits the calculation results from the calculation module 3, as well as the data from the first and second current signals, to external devices. The wireless transmission of the communication module 4 greatly simplifies data acquisition, allowing staff to conveniently obtain real-time measurement data from a safe distance or remotely, eliminating the hassle of wiring. This lays the foundation for remote monitoring, real-time diagnostics, and predictive maintenance, enabling maintenance personnel to monitor equipment status at any time, optimize maintenance plans, and reduce long-term costs.

[0019] Furthermore, the secondary current transformer 2 is equipped with a power supply module 5. This power supply module 5 charges through the induction circuit of the secondary current transformer 2 and provides operating power to the computing module 3 and the communication module 4. The power supply module 5 is a rechargeable battery. The battery can continuously supply power to the computing module 3 and the communication module 4 even when the main power supply fluctuates or is interrupted, ensuring stable operation of the equipment around the clock. This effectively solves the problem of work interruption in power outage scenarios with traditional power supply methods, and significantly improves the reliability and endurance of the system.

[0020] To further improve the system, the power supply module 5 is connected to the arithmetic module 3 and is used to output its charging status to the arithmetic module 3. When the power supply module 5 is charging, it draws power from the secondary current transformer 2, causing the secondary current signal to be slightly lower. The charging status of the power supply module is then input to the arithmetic module 3 to correct the secondary current signal, making the secondary current signal stable and reliable and unaffected by the charging of the power supply module 5. This results in more accurate calculations by the arithmetic module 3.

[0021] Further improvements include a detachable connection between the current transformer body 1 and the secondary current transformer 2, connected by a connecting rope 6; the current transformer body 1 is provided with a mounting base 11, and the secondary current transformer 2 is provided with a mounting protrusion 21 adapted to the mounting base 11. The mounting protrusion 21 and the mounting base 11 allow for quick assembly and disassembly of the secondary current transformer 2 and the current transformer body 1.

[0022] Furthermore, the housing has an outdoor protection rating of at least IP65. An IP65 protection rating protects internal components from harsh outdoor environments, providing excellent waterproofing and dustproof capabilities, significantly improving reliability and durability. This results in higher reliability, longer lifespan, lower maintenance costs, and a wider range of applications for this invention.

[0023] Working principle of this utility model

[0024] In use, the current transformer body 1 senses the current of the main cable and outputs a first current signal. The secondary current transformer 2 simultaneously senses the current of the main cable and outputs a second current signal. The calculation module 3 receives the first current signal and the second current signal. The preset algorithm set in the calculation module 3 compares the two signals and calculates the current measurement error of the current transformer body 1 in real time, and outputs it to the external device through the communication module 4.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-monitoring current transformer, characterized in that: The device includes a transformer body (1) and a housing. The transformer body (1) is used to sense the current of the main cable and output a first current signal. The transformer body (1) is connected to a secondary transformer (2). The secondary transformer is used to sense and measure the current of the main cable and output a second current signal. The secondary transformer (2) is equipped with a calculation module (3). The calculation module is used to receive the first current signal and the second current signal and perform calculations through preset parameters to obtain the real-time working error of the transformer body (1).

2. The self-monitoring current transformer according to claim 1, characterized in that: The secondary transformer (2) is equipped with a communication module (4), which is used to wirelessly transmit the calculation results of the calculation module (3) and the data of the first current signal and the second current signal to an external device.

3. A self-monitoring current transformer according to claim 2, characterized in that: The secondary transformer (2) is equipped with a power supply module (5), which charges the secondary transformer (2) through the induction circuit and provides working power to the arithmetic module (3) and the communication module (4).

4. A self-monitoring current transformer according to claim 3, characterized in that: The power supply module (5) is connected to the arithmetic module (3) and is used to output its charging status to the arithmetic module (3).

5. A self-monitoring current transformer according to claim 1, characterized in that: The transformer body (1) and the secondary transformer (2) are detachably connected and connected by a connecting rope (6); the transformer body (1) is provided with a mounting base (11), and the secondary transformer (2) is provided with a mounting protrusion (21) adapted to the mounting base (11).

6. A self-monitoring current transformer according to claim 1, characterized in that: The housing has an outdoor protection rating of not less than IP65.

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