Fuse with fault current detection function

Abstract

The utility model relates to a fuse with a fault current detection function, which comprises a fuse body arranged in an insulating tube and leads respectively arranged outside two ends of the insulating tube and connected with two ends of the fuse body, and is characterized in that a fault current detection device is arranged outside the insulating tube and comprises a box body fixed on the outer side surface of the insulating tube; a detection circuit board is arranged in the box body, at least one external interface is arranged on the box body and electrically connected to the detection circuit board, one lead penetrates into the current detection coil, a control chip is arranged on the detection circuit board, and the current detection coil is electrically connected to the control chip through a wire. Current data acquired and processed by the control chip is stored or uploaded to external equipment through the external interface. According to the utility model, current passing through the fuse can be detected and recorded, fault analysis is accelerated, and economic loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, and more specifically to a fuse with fault current detection. Background Art

[0002] At present, the fuses used in the power system cannot record the magnitude and waveform of the fusing current. Once a fault current occurs, it disappears after the event and leaves no trace. If it is necessary to reproduce it, it is necessary to conduct another test and detection, and some accidental ones are still very difficult to reproduce and detect again.

[0003] For short-circuit faults occurring in different devices or different positions in the system, the fault currents are different. For the same device, for short circuits in different device components or different positions, the fault currents that occur are also different. For technical personnel with the ability to analyze short-circuit fault currents, since they do not know what kind of current has occurred in the system, the troubleshooting of the fault causes still needs to be carried out one by one. If the technical personnel know the magnitude and waveform of the fault current and also have the ability to analyze the fault currents at various positions in the system, they can quickly lock in the fault causes and fault positions, accelerating the analysis of the accident causes and problem solving.

[0004] For the development of related equipment, the construction and testing of project plans, and the installation and commissioning of project equipment in new energy systems such as wind power, photovoltaics, energy storage, and charging, fuses are relatively easy to blow in these three stages. After the fuse blows, since relevant technical personnel cannot easily understand the magnitude and waveform of the current that caused the fuse to blow, it takes a long time to find the cause of the fault. Especially for some fuses that age and blow due to sudden surge currents with a low occurrence frequency caused by the opening and closing of system equipment or internal device failures, such faults are even more difficult to troubleshoot. At the same time, solving equipment failures in various scenarios requires delaying the operation of the equipment, which will cause certain economic losses.

[0005] In view of this, the designer has deeply considered the many deficiencies and inconveniences caused by the imperfect structural design of existing fuses, and has actively studied and improved the trial production to develop and design this creation. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a fuse with fault current detection, which can detect and record the current passing through the fuse, accelerate fault analysis, and reduce economic losses.

[0007] To achieve the above object, the solution of the utility model is:

[0008] A fuse with fault current detection, the fuse includes a melt disposed inside an insulating tube, and leads are respectively disposed outside both ends of the insulating tube to form connections with both ends of the melt. The characteristics are as follows: A fault current detection device is installed outside the insulating tube. The fault current detection device includes a box body fixed on the outer side surface of the insulating tube. A detection circuit board is disposed inside the box body. At least one external interface is disposed on the box body and electrically connected to the detection circuit board. It further includes a current detection coil, and one of the leads passes through the current detection coil. A control chip and a transmission module are disposed on the detection circuit board. The current detection coil is electrically connected to the control chip through a wire. The current data collected and processed by the control chip is stored or uploaded to an external device through the external interface.

[0009] Further, the current detection coil is a Rogowski coil or a Hall coil.

[0010] Further, the current detection coil is a Rogowski coil. A signal amplification module and a signal conversion module are further disposed on the detection circuit board and connected to the control chip. The Rogowski coil is electrically connected to the signal amplification module through a wire.

[0011] Further, the external interface is a USB interface and / or an optical fiber interface.

[0012] Further, a power interface is disposed on the box body, and the power interface is electrically connected to the detection circuit board.

[0013] Further, an insulating protection tube is coated outside the wire, and the insulating protection tube extends from the outside of the current detection coil to the box body.

[0014] Further, the fuse includes a melt disposed in a porcelain tube. Knife contacts and end caps are respectively disposed at both ends of the porcelain tube. Both ends of the melt are welded to the knife contacts. The leads are the knife contacts, and one of the knife contacts passes through the current detection coil.

[0015] Further, fixing pieces are respectively convexly provided on both sides of the box body, fixing holes are respectively provided on the fixing pieces, and the box body is locked on the insulating tube through screws.

[0016] After adopting the above structure, the present utility model provides a fuse with a fault current detection function. The fuse has a built-in fault current detection function and does not require an additional current detection function to be designed in the circuit, making it more convenient and fast to use. Through the fault current detection device, the current passing through the fuse and the abnormal current during a fault can be recorded in real time, stored or uploaded to the background for recording, which is convenient for providing an effective reference during subsequent fault analysis, facilitating the acceleration of fault analysis and elimination, and reducing economic losses. Description of the Drawings

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2It is a schematic structural diagram of the fault current detection device in the present utility model;

[0019] Figure 3 It is a schematic sectional view of the fault current detection device in the present utility model;

[0020] Figure 4 It is a circuit schematic diagram of the fault current detection device in the present utility model. Specific embodiments

[0021] In order to further explain the technical solution of the present utility model, the present utility model will be elaborated in detail through specific embodiments below.

[0022] As Figure 1 shown, the present utility model discloses a fuse with fault current detection. The fuse includes a melt (not shown in the figure) provided inside an insulating tube. Leads are respectively provided outside both ends of the insulating tube and form connections with both ends of the melt. The leads can be contact blades or pins, etc. to form terminal blocks and can be conductively connected to an external circuit or other devices. In this embodiment, the fuse includes a melt (not shown in the figure) provided in a porcelain tube 1. Contact blades 11 and end caps 12 are respectively provided at both ends of the porcelain tube 1. Both ends of the melt are welded to the contact blades 11, and the contact blades 11 protrude outside the porcelain tube 1.

[0023] In the present utility model, in combination with Figures 1 to 4 shown, in order to detect and record the current passing through the fuse, accelerate fault analysis, and reduce economic losses, a fault current detection device is installed outside the insulating tube 1 of the fuse. The fault current detection device includes a box body 21 fixed on the outer side surface of the insulating tube. A detection circuit board 22 is provided inside the box body 21. It also includes a current detection coil 3 capable of detecting current. One of the leads is inserted into the current detection coil. In this embodiment, the lead is a contact blade, and one of the contact blades 11 is inserted into the current detection coil 3. A control chip (not shown in the figure) is provided on the detection circuit board 22. The current detection coil 3 is electrically connected to the control chip through a wire 41. At least one external interface 26 is also provided on the box body 21 and is electrically connected to the detection circuit board. The current data collected and processed by the control chip can be stored or uploaded to an external device through the external interface.

[0024] Specifically, the current detection coil 3 can be a Rogowski coil or a Hall coil. In this embodiment, the current detection coil 3 adopts a Rogowski coil. A signal amplification module 23 and a signal conversion module 24 are also provided on the detection circuit board 22 and are connected to the control chip 25 (as Figure 4As shown in the figure, the Rogowski coil is electrically connected to the signal amplification module 23 through the wire 41. During operation, the Rogowski coil induces a large current to generate a voltage, forming a voltage signal detection coil. Then, the signal amplification module 23 (integrating circuit or differentiating circuit) is used to amplify the voltage. The output voltage is proportional to the current. After passing through the signal conversion module 24, this voltage analog quantity is converted into a digital quantity and transmitted to the control chip. The control chip 24 processes the current data to form waveform data, and then transmits it to the temporary memory or uploads it to the background control system through the external interface.

[0025] In this embodiment, two external interfaces 26 are provided on the box body 21. The external interfaces can be connected to the control chip through electric wires. The external interface 26 can be a USB interface or an optical fiber interface, or both the USB interface and the optical fiber interface can be set at the same time. Using optical fiber serial communication, the data is not easily lost and has strong anti-interference ability. Through the external interface 26, wired transmission can be realized, and the data collected by the control chip can be directly transmitted to the external memory or uploaded to the background data control center through the data line connected by the USB interface or the optical fiber interface at the same time.

[0026] A power interface (not shown in the figure) can also be provided on the box body 21. The power interface is electrically connected to the detection circuit board, and after the power interface is connected to the power supply, it supplies power to the detection circuit board 22. An indicator light can also be provided on the box body to indicate the working condition of the fault current detection device.

[0027] For the wire 41, an insulating protection tube 42 can be coated on the outside of the wire 41. The insulating protection tube 42 can be a rigid insulating tube. The wire 41 is passed through the insulating protection tube 42 to isolate and protect the wire 41. The insulating protection tube 42 extends from the outside of the current detection coil to the box body 21. Fixing pieces 27 are respectively convexly provided on both sides of the box body 21, and fixing holes are respectively provided on the fixing pieces 82. The box body 21 can be locked on the insulating tube through screws.

[0028] After adopting the above structure, the utility model directly assembles a current detection device on the fuse. The detection device can collect and record the current flowing through the fuse, and record the current in the external memory, or can be connected to the background data control system to transmit the data in real time, so as to remotely understand the current and action conditions flowing through the fuse. When a circuit failure occurs, the fault current and waveform that have occurred can be obtained from the external memory or the background data control system, which is beneficial to quickly analyze and determine the cause of the fault, and reduce the economic loss caused by the delay of equipment operation due to the unresolved equipment failure. At the same time, the current monitoring of the customer system can be improved, and the current monitoring and detection configuration at other positions can be saved. When the uncertainty and blind spots are the most in the new product system development stage of the customer, this fuse is beneficial for the customer to further understand the current situation during the development and research stage, and accelerate its development speed and correct selection of the fuse.

[0029] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by those of ordinary skill in the relevant technical field shall be regarded as not departing from the patent scope of the present utility model.

Claims

1. A fuse with fault current detection, the fuse comprising a melt disposed inside an insulating tube, and leads respectively disposed outside both ends of the insulating tube and forming connections with both ends of the melt, characterized in that: A fault current detection device is installed on the outer side of the insulating tube. The fault current detection device includes a box body fixed on the outer side surface of the insulating tube. A detection circuit board is arranged inside the box body. At least one external interface is arranged on the box body and electrically connected to the detection circuit board. It also includes a current detection coil. One of the leads penetrates into the current detection coil. A control chip is arranged on the detection circuit board. The current detection coil is electrically connected to the control chip through a wire. The current data collected and processed by the control chip is stored or uploaded to an external device through the external interface.

2. The fuse with fault current detection according to claim 1, characterized in that: The current detection coil is a Rogowski coil or a Hall coil.

3. A fuse with fault current detection according to claim 2, characterized in that: The current detection coil is a Rogowski coil. A signal amplification module and a signal conversion module are also arranged on the detection circuit board and connected to the control chip. The Rogowski coil is electrically connected to the signal amplification module through a wire.

4. A fuse with fault current detection according to claim 1, characterized in that: The external interface is a USB interface and / or an optical fiber interface.

5. A fuse with fault current detection according to claim 1 or 4, characterized in that: A power interface is arranged on the box body, and the power interface is electrically connected to the detection circuit board.

6. A fuse with fault current detection according to claim 1, characterized in that: An insulating protection tube is coated on the outside of the wire, and the insulating protection tube extends from the outside of the current detection coil to the box body.

7. The fuse with fault current detection according to claim 1, characterized in that: The fuse includes a fuse wire arranged in a porcelain tube. Knife contacts and end caps are respectively arranged at both ends of the porcelain tube. Both ends of the fuse wire are welded to the knife contacts. The lead is the knife contact, and one of the knife contacts penetrates into the current detection coil.

8. A fuse with fault current detection as described in claim 1, characterized in that: Fixing pieces are respectively convexly arranged on both sides of the box body. Fixing holes are respectively arranged on the fixing pieces. The box body is locked on the insulating tube through screws.

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