A power-taking CT open-circuit protector device

Abstract

The utility model relates to a kind of taking energy CT open-circuit protector device, for being installed in cable main body outside, the taking energy CT open-circuit protector device includes taking energy CT, open-circuit protector and power supply equipment connected in turn;The open-circuit protector includes input transient overvoltage protection module, quick-acting protection and automatic reset module, rectification and filter energy storage module, voltage detection and trigger control module and self-holding relay module;Taking energy CT includes the taking energy module with transient overvoltage protection module electrical connection;Power supply equipment includes the power supply module with self-holding relay module electrical connection.The taking energy CT open-circuit protector device, by real-time monitoring the secondary side outlet voltage of taking energy CT, trigger relay conduction lock dead conduction state after overrun, can ensure that taking energy CT is not affected when normal working, when secondary side open circuit occurs, open-circuit protector can timely and effectively intervene, prevent the risk of high pressure safety and rear-end equipment damage due to secondary side open circuit.

Description

Technical Field

[0001] This utility model relates to the field of circuit open circuit protection technology, specifically to an open circuit protector for a power-harvesting CT. Background Technology

[0002] Energy harvesting current transformers (CTs) are a technology that extracts electrical energy from power lines based on the principle of electromagnetic induction. They are mainly used in power monitoring equipment, smart grids, and other fields. They have advantages such as contactless power supply and maintenance-free operation. CTs extract power by converting alternating current in conductors into direct current through current transformers (CTs). Their core components are a magnetic core and a coil. The magnetic core extracts energy from the conductors through electromagnetic induction and converts it into stable direct current through a rectifier circuit. In high-voltage transmission lines, where traditional power supply methods are limited, CTs can solve the power supply problem for smart devices.

[0003] During normal operation, the secondary side of the CT is in a near-short-circuit state. If a fault occurs and the secondary side becomes open-circuited, the primary current is converted into excitation current, causing a surge in the magnetic flux of the iron core and deep saturation. According to the law of electromagnetic induction, the secondary winding will induce a high voltage with peak values ​​of several thousand volts or even tens of thousands of volts. This voltage will seriously threaten the life safety of operators, break down the insulation layer of the secondary circuit, and damage instruments, relay protection equipment, etc. The high voltage may trigger the protection device to malfunction or fail to operate. The interruption of current measurement caused by the open circuit will cause the associated relay protection to lose its judgment basis, leading to system misjudgment or even cascading failures. In addition, magnetic flux saturation causes the iron core to generate severe eddy currents and hysteresis losses, resulting in a sharp rise in the iron core temperature, which may cause the CT coil insulation to burn out, causing permanent damage. Therefore, an energy-harvesting CT open-circuit protection device is proposed to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an open-circuit protector for energy-harvesting CT scanners, which solves the safety and equipment damage problems caused by open circuits on the secondary side of energy-harvesting CT scanners.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a power-harvesting CT open-circuit protector device, used for installation on the cable body, the power-harvesting CT open-circuit protector device comprising: The energy-collecting CT, open-circuit protector, and power supply equipment are connected in sequence; The open-circuit protector includes an input transient overvoltage protection module, a fast-acting protection and automatic reset module, a rectification and filtering energy storage module, a voltage detection and trigger control module, and a self-holding relay module. The power harvesting CT includes a power harvesting module electrically connected to the transient overvoltage protection module; The power supply equipment includes a power supply module that is electrically connected to the self-holding relay module.

[0006] Furthermore, the input transient overvoltage protection module is electrically connected to the fast-acting protection and automatic reset module and the rectification and filtering energy storage module, respectively.

[0007] Furthermore, the rectification and filtering energy storage module, the voltage detection and trigger control module, and the self-holding relay module are electrically connected in sequence.

[0008] Furthermore, the energy-harvesting CT is electrically connected to the open-circuit protector via a secondary side output line, and the open-circuit protector is electrically connected to the power supply equipment via an output line.

[0009] This utility model also proposes a cable, including a power CT open circuit protector device for mounting on the cable body, the power CT open circuit protector device comprising: The energy-collecting CT, open-circuit protector, and power supply equipment are connected in sequence; The open-circuit protector includes an input transient overvoltage protection module, a fast-acting protection and automatic reset module, a rectification and filtering energy storage module, a voltage detection and trigger control module, and a self-holding relay module. The power harvesting CT includes a power harvesting module electrically connected to the transient overvoltage protection module; The power supply equipment includes a power supply module that is electrically connected to the self-holding relay module.

[0010] Compared with the prior art, the technical solution of this application has the following beneficial effects: This open-circuit protector for the power-harvesting CT monitors the secondary side output voltage of the power-harvesting CT in real time. When the voltage exceeds the limit, it triggers a relay to lock the conduction state. The device's high reliability, low temperature rise, self-powered, self-locking, non-contact reset technology, and ultra-low leakage current ensure that the power-harvesting CT's power harvesting is not affected during normal operation. When a secondary side open circuit occurs, the open-circuit protector can intervene in a timely and effective manner to prevent the risk of high voltage safety and damage to downstream equipment caused by the secondary side open circuit. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the physical structure of this utility model; Figure 2 This is an electrical connection block diagram of the present invention; Figure 3 This is a schematic diagram of the circuit connection structure of this utility model.

[0012] In the diagram: 1. Energy harvesting CT; 2. Cable body; 3. Secondary side outgoing line; 4. Open circuit protector; 5. Outgoing line; 6. Power supply equipment. Detailed Implementation

[0013] 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.

[0014] Please see Figure 1-3 In this embodiment, a power-harvesting CT open-circuit protector is installed outside the cable body 2. The power-harvesting CT open-circuit protector includes: The power CT1, the open circuit protector 4, and the power supply equipment 6 are connected in sequence. The power CT1 is electrically connected to the open circuit protector 4 through the secondary side output line 3, and the open circuit protector 4 is electrically connected to the power supply equipment 6 through the output line 5.

[0015] With this configuration, the open circuit protector 4 can obtain the secondary side output voltage value of the energy harvester CT1 through the secondary side output line 3, and release the voltage energy and convert it into DC voltage control, thereby providing dual protection and safety isolation for the power supply equipment 6.

[0016] In this embodiment, the open-circuit protector 4 includes an input transient overvoltage protection module, a fast-acting protection and automatic reset module, a rectification and filtering energy storage module, a voltage detection and trigger control module, and a self-holding relay module. The input transient overvoltage protection module is electrically connected to the fast-acting protection and automatic reset module and the rectification and filtering energy storage module, respectively. The rectification and filtering energy storage module, the voltage detection and trigger control module, and the self-holding relay module are electrically connected in sequence. The energy harvesting CT1 includes an energy harvesting module electrically connected to the transient overvoltage protection module. The power supply device 6 includes a power supply module electrically connected to the self-holding relay module.

[0017] Among them, such as Figure 3 As shown, the input transient overvoltage protection module contains an input transient overvoltage protection circuit, the fast-acting protection and automatic reset module contains a fast-acting protection and automatic reset circuit, the rectification and filtering energy storage module contains a rectification circuit and a filtering energy storage circuit, the voltage detection and trigger control module contains a voltage detection and trigger control circuit, and the self-holding relay module contains a self-holding relay circuit.

[0018] With this configuration, the transient overvoltage protection circuit can monitor the transient voltage value output from the secondary side of the energy harvesting CT1 in real time. The rectifier and filter energy storage module converts the AC voltage output from the transient overvoltage protection circuit into DC voltage and smooths the fluctuations to power the subsequent circuits. This enables the voltage detection and trigger control circuit to control the self-holding relay circuit to operate, preventing the secondary side of the energy harvesting CT1 from remaining open.

[0019] Specifically, when the secondary side is open-circuited, the voltage generated by electromagnetic induction will rise sharply. The input transient overvoltage protection module compares the real-time voltage with the preset maximum transient voltage value. If the voltage exceeds the limit, the fast protection and automatic reset circuit will be activated immediately to release the overvoltage energy generated by the open circuit through the protection resistor or discharge gap to avoid equipment damage. If the voltage returns to a safe range, the fast-acting protection and automatic reset circuit will automatically reset and return to normal monitoring status. Then, the AC voltage is converted into DC voltage by the rectifier circuit and the filter energy storage circuit, and the input voltage detection and trigger control circuit is used. When the detected voltage exceeds the preset threshold of the self-holding relay circuit, the self-holding relay circuit is energized, the contacts close, and the secondary side of the power CT1 is short-circuited or connected to the protective load, thus forcibly limiting the voltage rise.

[0020] This utility model also proposes a cable, which includes a cable body 2 and an energy-harvesting CT open circuit protector device sleeved and installed on its outside. The specific structure of the energy-harvesting CT open circuit protector device is as described in the above embodiments. Since this cable adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here.

[0021] In this embodiment, the energy harvesting CT1 is sleeved on the outside of the cable body 2 or integrated into the connector of the cable body 2.

[0022] With this configuration, when alternating current flows through the cable, an induced electromotive force is generated on the secondary side of the CT1, which can be rectified and regulated to monitor the power supply of the equipment.

[0023] Furthermore, the connector sleeved on the outside of the cable body 2 is non-contact, while the connector integrated into the cable body 2 is contact.

[0024] Specifically, during the monitoring of the cable body 2, the connection method of the energy harvesting CT1 can be selected according to the current environment. When the energy harvesting CT1 and the cable body 2 are connected in a non-contact manner, there is no need to directly contact the high-voltage conductor, thus avoiding the risk of electric arc. At the same time, there is no need to stop the power during installation, reducing power outage losses.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A powered CT open circuit protector device for mounting on a cable body (2) characterised in that, The energy harvesting CT open-circuit protector device includes: The energy-collecting CT (1), the open-circuit protector (4), and the power supply equipment (6) are connected in sequence. The open circuit protector (4) includes an input transient overvoltage protection module, a fast-acting protection and automatic reset module, a rectification and filtering energy storage module, a voltage detection and trigger control module, and a self-holding relay module; The energy harvesting CT (1) includes an energy harvesting module electrically connected to the transient overvoltage protection module; The power supply equipment (6) includes a power supply module electrically connected to the self-holding relay module.

2. The energy-harvesting CT open-circuit protector device according to claim 1, characterized in that, The input transient overvoltage protection module is electrically connected to the fast-acting protection and automatic reset module and the rectification and filtering energy storage module, respectively.

3. The energy-harvesting CT open-circuit protector device according to claim 1, characterized in that, The rectifier and filter energy storage module, voltage detection and trigger control module, and self-holding relay module are electrically connected in sequence.

4. The energy-harvesting CT open-circuit protector device according to claim 1, characterized in that, The energy-harvesting CT (1) is electrically connected to the open circuit protector (4) via the secondary side output line (3), and the open circuit protector (4) is electrically connected to the power supply equipment (6) via the output line (5).

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