Intelligent fuse device

Abstract

The present invention relates to an intelligent fuse device, comprising: a fusing circuit, which is used to be connected in series in the voltage transformer inlet circuit and disconnect the connected circuit when the current value of the fusing circuit reaches a preset first threshold; a detection device, which is used to detect the voltage value or current value of the fusing circuit; a signal sending device, which is used to send a fusing signal of the fusing circuit when the voltage value or current value detected by the detection device reaches a preset second threshold; and a signal receiving device, which is connected to a power grid monitoring server and is used to receive and transmit the fusing signal to the power grid monitoring server. The intelligent fuse device provided by the present invention can intelligently detect and transmit a high-voltage fuse fusing signal of a voltage transformer to a power grid monitoring server, so as to remind relevant staff to take effective measures in time, ensure the safe operation of the power grid and equipment, and reduce the losses caused by voltage transformer failures in the distribution network.

Description

Technical Field

[0001] The present invention relates to a fuse, and in particular to an intelligent fuse device for being connected in series to the inlet circuit of a voltage transformer in a distribution network. Background Art

[0002] A potential transformer (PT) is an important device for voltage measurement, metering, and relay protection in a distribution network. To protect the potential transformer and, at the same time, to avoid the adverse effects on the power grid system caused by the faults of the potential transformer body or the high-voltage side lead, it is generally necessary to install a high-voltage fuse at the inlet of the potential transformer. As a protection device for the potential transformer, the high-voltage fuse has been widely used in distribution networks below 110 kV due to its advantages of simple structure, convenient maintenance and repair.

[0003] On the one hand, during the actual operation process, the high-voltage fuse of the potential transformer in the distribution network often fails, resulting in the power outage on the secondary side of the power grid, abnormal increase in the zero-sequence voltage, causing errors in electric energy metering, and even causing false grounding alarms in the system and misoperation of the zero-sequence voltage protection relay, leading to wrong handling measures taken by the operating personnel and further expanding the scope of the accident. On the other hand, it is rather troublesome to replace the high-voltage fuse, which will increase the labor and material costs. Therefore, the traditional high-voltage fuse is not conducive to the safe, reliable, stable, and economic operation of the distribution network. Summary of the Invention

[0004] Based on this, it is necessary to provide an intelligent fuse device, aiming to solve at least one of the technical problems in the related art to a certain extent.

[0005] An intelligent fuse device provided by the present invention is used for being connected in series to the inlet circuit of a voltage transformer in a distribution network, and includes:

[0006] A fusing circuit for being connected in series to the inlet circuit of the voltage transformer and disconnecting the connected circuit when the current value of the fusing circuit reaches a preset first threshold;

[0007] A detection device for detecting the voltage value or current value of the fusing circuit;

[0008] A signal sending device for sending a fusing signal of the fusing circuit when the voltage value or current value detected by the detection device reaches a preset second threshold; and,

[0009] A signal receiving device connected to a power grid monitoring server for receiving the fusing signal sent by the signal sending device and transmitting the fusing signal to the power grid monitoring server.

[0010] The above intelligent fuse device can intelligently detect and transmit the fuse signal of the voltage transformer high-voltage fuse to the power grid monitoring server to remind relevant staff to take effective measures in time to ensure the safe operation of the power grid and equipment and reduce the losses caused by voltage transformer failures in the distribution network.

[0011] In one embodiment, the fusing circuit includes:

[0012] A first fusing device, which is used to be connected in series in the voltage transformer inlet circuit and disconnect the connected circuit when the current value flowing through it reaches a preset third threshold;

[0013] A second fusing device, which is connected in parallel with the first fusing device and disconnects the connected circuit when the current value flowing through it reaches a preset fourth threshold.

[0014] In one embodiment, the resistance value of the second fusing device is greater than that of the first fusing device.

[0015] In one embodiment, the second fusing device includes a fuse element and a high-value resistor connected in series, and the detection device includes a voltage detection device connected in parallel with the second fusing device.

[0016] In one embodiment, a high-value resistor is connected in series in the circuit connected in parallel with the first fusing device, and the high-value resistor is used to reduce the current flowing through the second fusing device. The detection device includes a voltage detection device connected in parallel with the high-value resistor.

[0017] In one embodiment, the first fusing device or the second fusing device further includes a body fusing indicator light, and the indicator light is lit when the body of the first fusing device or the second fusing device is fused.

[0018] In one embodiment, the resistance value of the high-value resistor can be 10 times the resistance value of the second fusing device or 500 Ω.

[0019] In one embodiment, when the voltage value detected by the voltage detection device exceeds 3.0 V, the signal sending device sends the fusing signal of the first fusing device, and the signal receiving device receives and transmits the fusing signal of the first fusing device to the power grid monitoring server.

[0020] In one embodiment, when the voltage value detected by the voltage detection device exceeds 7.5 V, the signal sending device sends the fusing signal of the second fusing device, and the receiving device receives and transmits the fusing signal of the second fusing device to the power grid monitoring server.

[0021] In one embodiment, the signal receiving device further includes:

[0022] A signal processing device is used to process the received fuse signal and then transmit the fuse signal to the power grid monitoring server.

[0023] In one embodiment, the signal sending device is a wireless signal sending device, which can be an infrared signal sending device.

[0024] In one embodiment, the signal receiving device further includes:

[0025] An antenna, which is arranged outside the voltage transformer cabinet and is used to transmit signals externally; and,

[0026] An infrared signal receiver, which is arranged outside the voltage transformer cabinet and is covered with a filter glass and / or plastic with the function of filtering sunlight; or, the infrared signal receiver is arranged inside the voltage transformer cabinet; the infrared signal receiver is powered by a battery and / or obtains electric energy through the voltage transformer. Brief Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the system architecture of the intelligent fuse device provided in the first embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the system architecture of the intelligent fuse device provided in the second embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the system architecture of the intelligent fuse device provided in the third embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of the system architecture of the intelligent fuse device provided in the fourth embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of the system architecture of the intelligent fuse device provided in the fifth embodiment of the present invention.

[0032] Figure 6 It is a schematic diagram of the melt structure of the intelligent fuse device provided in one embodiment of the present invention. Detailed Description of the Embodiments

[0033] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing particular embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] In the case of using "comprising", "having", and "including" described herein, unless an explicit limiting term is used, such as "only", "consisting of", etc., another component may also be added. Unless otherwise mentioned, terms in the singular form may include the plural form and should not be construed as having a quantity of one.

[0036] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present invention, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, in the description of the present invention, unless otherwise specified, the meanings of "a plurality of", "multiple groups", and "multiple roots" are two or more.

[0039] A fuse is to melt the fuse wire by the heat generated by itself after the current exceeds the specified value for a period of time, thereby disconnecting the circuit. As a protector against short circuits and overcurrents, fuses are widely used in high and low voltage power distribution systems, control systems, and electrical equipment, and are one of the most commonly used protection devices.

[0040] A fuse mainly consists of a fuse element, a fuse tube, and additional filling materials, etc. When in use, the fuse is connected in series to the circuit to be protected. When the current in the circuit to be protected exceeds a specified value, which is the rated current value of the fuse element, after a certain period of time, the heat generated by the fuse element itself melts the fuse element, disconnecting the circuit, thus playing a protective role. An electrical appliance that uses a metal conductor as the fuse element to interrupt the circuit is connected in series to the circuit. When an overload or short-circuit current passes through the fuse element, the fuse element will heat up and melt by itself, thereby playing a certain protective role for the power system, various electrical equipment, and household appliances. A fuse mainly consists of three parts: a fuse element, a housing, and a support. Among them, the fuse element is the key component that controls the fusing characteristics.

[0041] An intelligent fuse device provided in an embodiment of the present invention is used to be connected in series to the voltage transformer inlet circuit in a distribution network, and includes:

[0042] A fusing circuit, which is used to be connected in series to the voltage transformer inlet circuit and disconnect the connected circuit when the current value in the fusing circuit reaches a preset first threshold. For example, the fusing circuit may include a fuse element. When the current value flowing through the fuse element reaches the rated current value of the fuse element, the fuse element melts and disconnects the circuit connected to the fuse element;

[0043] A detection device, which is used to detect the voltage value or current value of the fusing circuit. For example, the detection device may be connected in series to the circuit to detect the current value flowing through the circuit where it is located. The detection device may also be connected in parallel to the circuit to be monitored to detect the voltage value of the circuit to be monitored;

[0044] A signal sending device, which is used to send a fusing signal of the fusing circuit when the voltage value or current value detected by the detection device reaches a preset second threshold. In some embodiments, the signal sending device may be a wireless signal sending device. In this embodiment, the signal sending device can be selected as an infrared signal sending device;

[0045] A signal receiving device, which is connected to the power grid monitoring server and is used to receive the fusing signal sent by the signal sending device and transmit the fusing signal to the power grid monitoring server. In some embodiments, the signal receiving device may include a signal processing device, which is used to further process the received fusing signal and then transmit the processed fusing signal to the power grid monitoring server. In some embodiments, the signal receiving device may be a wireless signal receiving device. In this embodiment, the signal receiving device can be selected as an infrared signal receiver.

[0046] The intelligent fuse device provided in the above embodiment can intelligently detect and transmit the fusing signal of the high-voltage fuse of the voltage transformer to the power grid monitoring server to remind relevant staff to take effective measures in time, ensure the safe operation of the power grid and equipment, and reduce the losses caused by voltage transformer failures in the distribution network.

[0047] In some embodiments of the present invention, the fusing circuit may include a plurality of fusing devices connected in parallel. When the current value flowing through a fusing device reaches a specified current value, the circuit connected thereto is disconnected. Taking the example that the fusing circuit includes two fusing devices connected in parallel, the present embodiment will be further described as follows. The fusing circuit includes:

[0048] A first fusing device, which is used to be connected in series in the inlet circuit of a voltage transformer. When the current value flowing through it reaches a preset third threshold value, the connected circuit is disconnected. In some embodiments, the first fusing device includes a fuse element. When the current value flowing through the fuse element in the first fusing device reaches the rated current value of the fuse element, the fuse element melts and disconnects the circuit connected to the first fusing device;

[0049] A second fusing device, which is connected in parallel with the first fusing device and is used to disconnect the connected circuit when the current value flowing through it reaches a preset fourth threshold value. In some embodiments, the second fusing device includes a high-resistance fuse element, and the resistance value of the high-resistance fuse element is greater than that of the first fusing device, so that when the first fusing device disconnects its connected circuit, the second fusing device can continue to work to ensure that the voltage transformer connected thereto can work normally.

[0050] In some embodiments of the present invention, the second fusing device includes a fuse element and a high-value resistor connected in series. When the current value flowing through the fuse element reaches the rated current value of the fuse element, the fuse element melts and disconnects the circuit connected to the second fusing device.

[0051] In some embodiments of the present invention, a high-value resistor is also connected in series with the second fusing device. The high-value resistor and the second fusing device connected in series form a parallel circuit of the first fusing device. The high-value resistor can reduce the current flowing through the second fusing device. After the first fusing device melts, the high-value resistor can play a role in protecting the second fusing device.

[0052] In some embodiments of the present invention, the fusing device includes a body fusing indicator light, which is lit when the body of the fusing device is fused. When the staff sees that the fusing indicator light is lit, it can be preliminarily determined that the fuse in the fusing device has been fused. In this embodiment, the detection device may include a voltage detection device connected in parallel with a high-value resistor for detecting the terminal voltage of the high-value resistor. After the first fusing device is fused and the resonance disappears, the current flowing through the second fusing device will stabilize within a certain range, and the terminal voltage of the high-value resistor will also stabilize within a certain range. By detecting whether the terminal voltage of the high-value resistor is within a preset range, it can be determined whether the second fusing device has been fused. For example, applying the intelligent fusing device in the embodiment of the present invention to the voltage transformer input circuit in a 10KV distribution network and selecting a suitable fuse. In some embodiments, the resistance value of the high-value resistor can be set to about 10 times the resistance value of the second fusing device. Here, the resistance value of the high-value resistor is selected as 500Ω. After the fuse in the first fusing device is fused, the current flowing through the high-value resistor will increase. Therefore, by detecting the terminal voltage of the high-value resistor, it can be determined whether the first fusing device is fused. For example, according to the resistance values of the selected first fusing device and the second fusing device, the first threshold of the voltage detection device is set to 3V. When the measured value of the voltage detection device reaches 3V, the signal sending device is started to send the fusing signal of the first fusing device; after the first fusing device is fused, the current flowing through the second fusing device will quickly stabilize within the range of 10mA - 15mA in the normal working state, and the voltage across the high-value resistor will stabilize within the range of 5V - 7.5V. Therefore, the second threshold of the voltage detection device can be set to 7.5V. When the measured value of the voltage detection device reaches 7.5V, the signal sending device is started to send the fusing signal of the second fusing device.

[0053] In some embodiments of the present invention, the infrared signal receiver is arranged outside the voltage transformer cabinet. Due to sunlight irradiation, a filter glass and / or plastic for filtering sunlight can be covered and arranged outside the infrared signal receiver.

[0054] In some embodiments of the present invention, the signal receiving device can be an infrared signal receiver, which may include an antenna for transmitting signals externally; the infrared signal receiver is arranged inside the voltage transformer cabinet, obtains electric energy through the voltage transformer, or is powered by a battery; the antenna can be arranged outside the voltage transformer cabinet for facilitating signal transmission. In some embodiments, the antenna can transmit signals to the power grid monitoring server through GPRS.

[0055] The following further describes some embodiments of the present invention with reference to the accompanying drawings.

[0056] As Figure 1 shown, an intelligent fuse device 100 provided in an embodiment of the present invention is used to be connected in series in the voltage transformer inlet circuit in the distribution network and includes:

[0057] A fusing circuit 110, which is used to be connected in series in the input circuit of a voltage transformer. When the current value in the fusing circuit reaches a preset first threshold value, the connected circuit is disconnected. For example, the fusing circuit may include a fuse element. When the current flowing through the fuse element reaches its rated current, the fuse element melts and disconnects the circuit connected to the fuse element;

[0058] A detection device 120, which is used to detect the voltage value or current value of the fusing circuit. For example, the detection device can be connected in series in the circuit to detect the current value flowing through the circuit where it is located. The detection device can also be connected in parallel with the circuit to be monitored to detect the voltage value of the circuit to be monitored;

[0059] A signal sending device 130, which is used to send a fusing signal of the fusing circuit when the voltage value or current value detected by the detection device reaches a preset second threshold value. In some embodiments, the signal sending device can be a wireless signal sending device. In this embodiment, the signal sending device can be selected as an infrared signal sending device;

[0060] A signal receiving device 140, which is connected to a power grid monitoring server and is used to receive the fusing signal sent by the signal sending device and transmit the fusing signal to the power grid monitoring server. In some embodiments, the signal receiving device may include a signal processing device, which is used to further process the received fusing signal and then transmit it to the power grid monitoring server. In some embodiments, the signal receiving device can be a wireless signal receiving device. In this embodiment, the signal receiving device can be selected as an infrared signal receiver.

[0061] The intelligent fuse device provided in this embodiment can intelligently detect and transmit the fusing signal of the high-voltage fuse of the voltage transformer to the power grid monitoring server, so as to remind relevant staff to take effective measures in time, ensure the safe operation of the power grid and equipment, and reduce the losses caused by voltage transformer failures in the distribution network.

[0062] As Figure 2 shown, an intelligent fuse device 100 provided in an embodiment of the present invention is used to be connected in series in the input circuit of a voltage transformer in a distribution network. The difference from the embodiment shown in Figure 1 is that the fusing circuit includes two fusing devices connected in parallel, that is,

[0063] A first fusing device 111, which is used to be connected in series in the input circuit of the voltage transformer. When the current value flowing through it reaches a preset third threshold value, the connected circuit is disconnected. In some embodiments, the first fusing device includes a fuse element. When the current value flowing through the fuse element reaches the rated current value of the fuse element, the fuse element melts and disconnects the circuit connected to the first fusing device;

[0064] The second fusing device 112, which is connected in parallel with the first fusing device, is used to disconnect the connected circuit when the flowing current value reaches a preset fourth threshold. The resistance value of the second fusing device is greater than that of the first fusing device. In the case where the first fusing device disconnects its connected circuit, the second fusing device can continue to work to ensure that the voltage transformer it is connected to can work properly.

[0065] In this embodiment, the detection device is a voltage detection device 121 connected in parallel with the second fusing device 112. Since the current value flowing through the second fusing device 112 increases after the first fusing device 111 fuses, the terminal voltage of the second fusing device 112 increases. Therefore, the first threshold of the voltage detection device 121 can be set according to the resistance value of the first fusing device 111. When the measured value of the voltage detection device 121 reaches this first threshold, the signal sending device 130 is triggered to send a fusing signal of the first fusing device 111; the second threshold of the voltage detection device 121 is set according to the resistance value of the second fusing device 112. When the measured value of the voltage detection device 121 reaches this second threshold, the signal sending device 130 is triggered to send a fusing signal of the second fusing device 112;

[0066] The signal receiving device 140, which is connected to the power grid monitoring server, is used to receive the fusing signal sent by the signal sending device and transmit the fusing signal to the power grid monitoring server. In some embodiments, the signal receiving device may include a signal processing device for further processing the received fusing signal and then transmitting it to the power grid monitoring server. In some embodiments, the signal receiving device may be a wireless signal receiving device. In this embodiment, the signal receiving device can be selected as an infrared signal receiver.

[0067] In some embodiments of the present invention, the infrared signal receiver can be arranged outside the voltage transformer cabinet. Since there is sunlight irradiation, a filter glass and / or plastic for filtering sunlight can be covered outside the infrared signal receiver; in some embodiments, the infrared signal receiver may include an antenna for transmitting signals externally. When the infrared signal receiver is arranged inside the voltage transformer cabinet, the antenna can be arranged outside the voltage transformer cabinet to facilitate signal transmission. In this embodiment, the antenna can transmit signals to the power grid monitoring server through GPRS. In this embodiment, the infrared signal receiver can obtain electric energy through the voltage transformer or can also be powered by a battery.

[0068] As Figure 3 shown, an intelligent fusing device 100 provided in an embodiment of the present invention is used to be connected in series in the voltage transformer inlet circuit of the distribution network, and is connected to Figure 2The difference in the embodiment shown is that the second fusing device includes a fuse melt 1121 and a high-value resistor 1122. When the current flowing through the fuse melt 1121 reaches the rated current value of the fuse melt, the fuse melt melts. The high-value resistor 1122 is used to reduce the current flowing through the second fusing device 1122, so that in the case where the first fusing device disconnects the circuit it is connected to, the second fusing device can continue to operate to ensure that the voltage transformer it is connected to can operate normally.

[0069] As Figure 4 shown, an intelligent fuse device 100 provided in an embodiment of the present invention is used to be connected in series in the voltage transformer inlet circuit in the distribution network, and is connected to Figure 2The difference in the embodiment shown is that a high-value resistor 1122 is also connected in series with the second fusing device 112. The high-value resistor 1122 and the series-connected second fusing device 112 form a parallel circuit of the first fusing device 111. The high-value resistor 1122 can reduce the current flowing through the second fusing device 112. After the first fusing device 111 fuses, the high-value resistor 1122 can play a role in protecting the second fusing device 112. In this embodiment, the fusing device includes a body fusing indicator light, and the indicator light lights up when the fusing device body fuses. When the staff sees the fusing indicator light lit, it can be preliminarily judged that the fusing device body has fused. In this embodiment, the detection device may include a voltage detection device 121 connected in parallel with the high-value resistor 1122 for detecting the terminal voltage of the high-value resistor 1122. After the first fusing device 111 fuses and the resonance disappears, the current flowing through the second fusing device 112 will stabilize within a certain range, and the terminal voltage of the high-value resistor 1122 will also stabilize within a certain range. By detecting whether the terminal voltage of the high-value resistor 1122 is within a preset range, it can be judged whether the second fusing device 112 has fused. For example, applying the intelligent fusing device in the embodiment of the present invention to the voltage transformer input circuit in a 10KV distribution network and selecting a suitable fuse. In some embodiments, the resistance value of the high-value resistor 1122 can be set to about 10 times the resistance value of the second fusing device 112. Here, the resistance value of the high-value resistor 1122 is selected as 500Ω. After the fuse in the first fusing device 111 fuses, the current flowing through the high-value resistor 1122 will increase. Therefore, it can be judged whether the first fusing device 111 has fused by detecting the terminal voltage of the high-value resistor 1122. For example, according to the selected resistance values of the first fusing device 111 and the second fusing device 112, the first threshold of the voltage detection device 121 is set to 3V. When the measured value of the voltage detection device 121 reaches 3V, the signal sending device 130 is activated to send a fusing signal of the first fusing device 111; after the first fusing device 111 fuses, the current flowing through the second fusing device 112 quickly stabilizes within the range of 10mA - 15mA in the normal working state, and the voltage across the high-value resistor 1122 will stabilize within the range of 5V - 7.5V. Therefore, the second threshold of the voltage detection device 121 can be set to 7.5V. When the measured value of the voltage detection device 121 reaches 7.5V, the signal sending device is activated to send a fusing signal of the second fusing device 112. The signal receiving device 140 receives the fusing signal and transmits the fusing signal to the power grid monitoring server.

[0070] As Figure 5 shown, an intelligent fuse device 100 provided in an embodiment of the present invention is used to be connected in series in the voltage transformer inlet circuit in the distribution network, and is connected to Figure 4The difference in the illustrated embodiment is that a third fusing device 113 is connected in parallel with the first fusing device 111, and the resistance value of the third fusing device 113 can be set between the resistance value of the first fusing device 111 and the high-value resistor 1122. The third fusing device 113 can continue to operate after the first fusing device 111 fuses, ensuring the normal operation of the voltage transformer connected thereto; after the third fusing device 113 fuses, the second fusing device 112 continues to operate, ensuring the normal operation of the voltage transformer connected thereto. In some embodiments, multiple fusing devices can be connected in parallel at both ends of the first fusing device 111 to form multiple parallel branches of the first fusing device 111, and the resistance values of each branch are different, so that each parallel branch can successively ensure the normal operation of the voltage transformer. Figure 5 The circuit connection form shown schematically illustrates that the number of parallel branches of the first fusing device 111 can be at least 2. In some other embodiments, the number of parallel branches of the first fusing device 111 can be appropriately increased or decreased according to the actual situation.

[0071] As Figure 6 shown, the fuse element of an intelligent fuse device provided in an embodiment of the present invention includes: an outer cap 1123, an outer tube 1124, an inner tube 1125, an inner tube fuse 1126, an outer tube fuse 1127, and quartz sand 1128. The outer tube 1124 is a hollow tubular structure, and the outer cap 1123 is provided at the left and right ends of the outer tube 1124 to close the outer tube 1124 and play an insulating and protective role; the inner tube 1125 is provided in the hollow cavity inside the outer tube 1124, and the left and right ends of the inner tube 1125 are respectively connected to the outer cap 1123, so that a closed cavity body is formed inside the inner tube 1125; the inner tube fuse 1126 is provided in the hollow cavity inside the inner tube 1125, and the left and right ends of the inner tube fuse 1126 are respectively connected to the outer cap 1123; the outer tube fuse 1127 is provided in the hollow cavity formed between the inside of the outer tube 1124 and the outside of the inner tube 1125, and the left and right ends of the outer tube fuse 1127 are respectively connected to the outer cap 1123; the outer tube fuse 1127 and the inner tube fuse 1126 form a parallel structure. In this embodiment, the maximum length of the fuse element can be 194 mm, the diameter of the outer cap 1123 can be 30 mm, and the hollow cavities inside the outer tube 1124 and the inner tube 1125 can be filled with quartz sand 1128 to play a role in isolating, insulating, and protecting the fuse. In this embodiment, the resistance value of the inner tube fuse 1126 can be set to 10 Ω, and the resistance value of the outer tube fuse 1127 can be set to 1.11 Ω. Since the resistance value of the inner tube fuse 1126 is greater than that of the outer tube fuse 1127, the current value flowing through the inner tube fuse 1126 is less than the current value flowing through the outer tube fuse 1127, so that the inner tube fuse 1126 can continue to operate when the outer tube fuse 1127 fuses. Figure 6 Only schematically illustrates the structure of the fuse element, and can be in Figure 6On the basis of the melt structure shown in the figure, increase the number of fuses connected in parallel with the outer tube fuse 1127.

[0072] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0073] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An intelligent fuse device, which is used to be connected in series to the inlet circuit of a voltage transformer in a distribution network, Characterized in that, Comprising: A fusing circuit, which is used to be connected in series to the inlet circuit of the voltage transformer. When the current value of the fusing circuit reaches a preset first threshold, the connected circuit is disconnected, and a high-value resistor is automatically connected to destroy the resonance condition and stabilize the current flowing through the fusing circuit; A detection device, which is used to detect the voltage value or current value of the fusing circuit; A signal sending device, which is used to send a fusing signal of the fusing circuit when the voltage value or current value detected by the detection device reaches a preset second threshold; And, A signal receiving device, which is connected to a power grid monitoring server and is used to receive and transmit the fusing signal to the power grid monitoring server; The fusing circuit includes: A first fusing device, which is used to be connected in series to the inlet circuit of the voltage transformer. When the flowing current value reaches a preset first threshold, the connected circuit is disconnected; A second fusing device, which is connected in parallel with the first fusing device and is used to disconnect the connected circuit when the flowing current value reaches a preset second threshold; The resistance value of the second fusing device is greater than that of the first fusing device; The second fusing device includes a fuse element and a high-value resistor connected in series.

2. The intelligent fuse device according to claim 1, Characterized in that, The detection device includes a voltage detection device connected in parallel with the second fusing device.

3. The intelligent fuse device according to any one of claims 1-2, Characterized in that, The second fusing device is connected in series with a high-value resistor and is connected in parallel with the first fusing device together. The high-value resistor is used to reduce the current flowing through the second fusing device; the detection device includes a voltage detection device connected in parallel with the high-value resistor.

4. The intelligent fuse device according to any one of claims 1-2, Characterized in that, The fusing device includes a body fusing indicator light, and the indicator light is lit when the fusing device body fuses.

5. The intelligent fuse device according to any one of claims 1-2, Characterized in that, The signal sending device is a wireless signal sending device.

6. The intelligent fuse device according to any one of claims 1-2, Characterized in that, The signal receiving device includes: A signal processing device, which is used to process the received fusing signal and then transmit the fusing signal to the power grid monitoring server.

7. The intelligent fuse device according to claim 6, Characterized in that, The signal receiving device further includes: An antenna, which is arranged outside the voltage transformer cabinet and is used to transmit signals externally; and, An infrared signal receiver, which is arranged outside the voltage transformer cabinet and is covered with a filter glass and / or plastic with the function of filtering sunlight; or, the infrared signal receiver is arranged inside the voltage transformer cabinet; the infrared signal receiver is powered by a battery and / or obtains electric energy through the voltage transformer.

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