CN112345927B - Monitoring system of fuse and intelligent fuse - Google Patents

Abstract

The invention discloses a fuse monitoring system and an intelligent fuse. The system includes: an intelligent monitoring base arranged at the bottom of the fuse, a CT ring set at the lower lead of the fuse, and a management terminal; Wherein, the intelligent monitoring base includes: a PCB board, circuit elements welded on the PCB board, and a pair of copper foils covered on the PCB board and the lower surface; the CT ring includes a current measurement sensor; The circuit elements welded on the PCB include: an electric field measurement module, a first amplifier, an MCU, a second amplifier, and a wireless module; the management terminal judges that the fuse is blown according to the current value and the electric field value reported by the MCU, or There is a power failure on the line. The application of the present invention can not only monitor the fuse state of the fuse, but also monitor the current and electric field value of the line and judge whether there are other situations such as power failure.

Description

A monitoring system for a fuse and an intelligent fuse

technical field

The invention relates to the technical field of power grid monitoring, in particular to a fuse monitoring system and an intelligent fuse.

Background technique

In my country's distribution network lines, fuses are widely used. The principle mainly depends on the selected fuses with different rated currents to limit the line current. When a large current fault occurs, the current exceeds the rated current of the fuse, and the melt itself fuses to form Arc, and then under the action of high temperature, the arc will vaporize the special material in the arc extinguishing tube to produce a large amount of gas, and then rely on this gas to blow out the arc when the current crosses zero, and push the fuse tube out of the fuse body through the action of a spring. Form an electrical port, cut off the fault, and realize the protection of the distribution network line. The problem now is that it is difficult to accurately judge the operating status of the fuse itself and the operating status of the line, and it is difficult to locate the fault.

At this stage, there are many methods for monitoring the state of fuse-carrying tubes, such as monitoring by gravity sensing and monitoring by displacement sensors. Among them, the monitoring method using the gravity sensing method is that when the fuse carrying tube pops up, the gravity sensing detection circuit detects that the carrying tube has fallen, and when the melting tube falls, the trigger circuit wakes up the single-chip microcomputer. After the single-chip is awakened, the acquisition status The data information is processed to determine that the fuse is blown. However, this method needs to drill additional holes on the fuse base to install the sensor, which makes the structure complicated, affects the appearance and is not easy to install.

The method of using the displacement sensor to monitor is that a position monitoring component is installed on the fuse body, and the position of the monitoring component corresponds to the position of the fuse-carrying tube on the fuse body. off state. However, this method can only monitor the fuse state of the fuse, but it cannot be judged whether there are other states in the distribution network line, such as power failure.

Contents of the invention

In view of this, the object of the present invention is to propose a fuse monitoring system and an intelligent fuse, which has a simple structure, does not affect the appearance, is easy to install, and can not only monitor the state of the fuse, but also monitor the Monitor the current and electric field values and judge whether there are other conditions, such as power failure.

Based on the above purpose, the present invention provides a fuse monitoring system for monitoring fuses installed on three-phase lines. The system includes:

The intelligent monitoring base arranged at the bottom of the fuse, the CT ring set on the lower lead of the fuse, and the management terminal; wherein, the intelligent monitoring base includes: a PCB board, a circuit welded on the PCB board Components, and a pair of copper foils covered on the PCB board and the lower surface; the CT ring includes a current measurement sensor; the circuit components welded on the PCB include: an electric field measurement module, a first amplifier, MCU, second amplifier, wireless module;

Wherein, the electric field measurement module is used to measure the potential difference formed by the copper foil, and output the measured electric field value to the first amplifier; the signal amplified by the first amplifier is input to the MCU;

The current measurement sensor is used to measure the current of the circuit where the fuse is located, and output the measured current value to the second amplifier; the signal amplified by the second amplifier is input to the MCU;

The MCU reports the measured current value and electric field value to the management terminal through the wireless module; the management terminal judges that the fuse is blown according to the reported current value and electric field value, or the line where the fuse is located is broken. Power outage failure.

Preferably, the management terminal is specifically used for if the current value reported by the intelligent monitoring base of the fuse of one phase line in the three-phase line is lower than the set current threshold, the electric field value is not lower than the set electric field threshold, and Compared with the previously reported electric field value, the decrease of the current reported electric field value is greater than the set amplitude threshold, and the current value and electric field value reported by the intelligent monitoring base of the other two fuses are normal, then it is judged that the phase line is blown The fuse in the fuse is blown, and the fuse-carrying tube pops out; if the current values reported by the intelligent monitoring base of the three fuses of the three-phase line are all lower than the set current threshold value, the electric field value is lower than the set electric field threshold value, and the current If the reported electric field values are all lower than the previously reported electric field values by more than the set amplitude threshold, it is determined that the three-phase line has a power outage fault.

Preferably, the CT ring also includes: an inductive power-taking sensor; the circuit element welded on the PCB board also includes: a booster module;

Wherein, the inductive power-taking sensor takes power from the alternating electric field and then outputs it, which is boosted by the booster module; the boosted voltage output by the booster module is used for each circuit element in the intelligent monitoring base. powered by.

Alternatively, the CT ring further includes: an inductive power-taking sensor; the circuit elements welded on the PCB further include: a supercapacitor, a diode D1, a boost module, a diode D2, and a charging management module;

Wherein, the inductive power-taking sensor charges the supercapacitor through the charging management module;

The anode of the diode D1 is connected to the output of the inductive power-taking sensor, and the cathode of the diode D1 is connected to the input of the boost module;

The anode of the diode D2 is connected to the voltage output terminal of the supercapacitor, and the cathode of the diode D2 is connected to the input of the boost module;

The output of the step-up module is connected with the power lines of each circuit element in the intelligent monitoring base to supply power for each circuit element.

Alternatively, the CT ring further includes: an inductive power-taking sensor; the circuit elements welded on the PCB further include: a supercapacitor, a diode D1, a boost module, a diode D2, and a charging management module;

Wherein, the inductive power-taking sensor charges the supercapacitor through the charging management module;

The anode of the diode D1 is connected to the output of the inductive power-taking sensor, and the cathode of the diode D1 is connected to the input of the boost module;

The anode of the diode D2 is connected to the voltage output terminal of the supercapacitor, and the cathode of the diode D2 is connected to the input of the boost module;

The output of the step-up module is connected with the power lines of each circuit element in the intelligent monitoring base to supply power for each circuit element.

Preferably, the outputs of the inductive power-taking sensor, the supercapacitor, and the backup battery are all connected to the MCU; and

The MCU is also configured to periodically report the collected output voltages of the inductive power-taking sensor, the supercapacitor, and the backup battery to the management terminal through the wireless module.

Preferably, the management terminal is also used to determine that the intelligent monitoring base has a low battery after confirming that the output voltages of the inductive power-taking sensor, the supercapacitor, and the backup battery reported by the intelligent monitoring base are all lower than the set voltage threshold event.

Preferably, the management terminal is further configured to determine that the intelligent monitoring base has a communication failure if it does not receive the data reported by the intelligent monitoring base for three consecutive periods and there is no low battery event.

Further, the system also includes: a system master station;

The management terminal is also used to upload the judgment result made according to the data reported by the intelligent monitoring base to the system master station.

The present invention also provides an intelligent fuse, including: a fuse body, an intelligent monitoring base and a CT ring in the system as described above.

The fuse monitoring system of the technical solution of the present invention includes an intelligent monitoring base arranged at the bottom of the fuse, a CT ring set at the lower lead of the fuse, and a management terminal; wherein, the intelligent monitoring base It includes: a PCB board, circuit elements welded on the PCB board, and a pair of copper foils covered on the PCB board and the lower surface; the CT ring includes a current measurement sensor; the soldered on the PCB board The circuit components include: an electric field measurement module, a first amplifier, an MCU, a second amplifier, and a wireless module; wherein, the electric field measurement module is used to measure the potential difference formed by the copper foil, and output the measured electric field value to the first Amplifier; the signal amplified by the first amplifier is input to the MCU; the current measurement sensor is used to measure the current of the line where the fuse is located, and the measured current value is output to the second amplifier; the amplified signal of the second amplifier The signal is input to the MCU; the MCU reports the measured current value and electric field value to the management terminal through the wireless module; the management terminal judges that the fuse of the fuse is blown according to the reported current value and electric field value, Or a power failure occurs on the line where the fuse is located. Since it is only necessary to install an intelligent monitoring base at the bottom of the fuse and put a CT ring on the lower lead of the fuse, the structure is simple, does not affect the appearance, and is easy to install. Not only can the state of the fuse be monitored, but also the circuit Monitor current and electric field values and judge whether there are other conditions, such as power failure.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a monitoring system for a fuse provided by the present invention;

Figures 2a and 2b are respectively schematic diagrams of states where the melt-carrying tube is not ejected and the melt-carrying tube is popping up in the fuse provided by the present invention;

Fig. 3 is a schematic diagram of connection of circuit elements in an intelligent monitoring base provided by the present invention;

Fig. 4 is a schematic diagram of the connection between a CT ring and an intelligent monitoring base provided by the present invention;

Figures 5a, 5b and 5c are respectively schematic diagrams of connection of circuit elements in the intelligent monitoring base of the three embodiments provided by the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

A fuse monitoring system provided by the present invention is used to monitor three fuses arranged on a three-phase line, and its architecture is shown in Figure 1, including: The intelligent monitoring base 111 at the bottom of the fuse, the annular CT (current mutual induction) ring 112 sleeved at the lower lead of the fuse, and the management terminal 113 for wireless communication with the intelligent monitoring base 111 of each fuse.

Wherein, the fuse (or called fuse body) in Fig. 1 is consistent with the existing fuse structure, specifically may include: upper lead wire 101, closed ceramic body 102, mounting hoop 103, lower lead wire 104, and melting tube 105 . The state where the melt-carrying tube 105 is not ejected, that is, the normal state, as shown in Figure 2a;

The intelligent monitoring base 111 installed at the bottom of the fuse has a hole in the middle so that the fuse-carrying tube 105 can pop out through the hole; the pop-up state of the fuse-carrying tube 105 is shown in Figure 2b.

The intelligent monitoring base 111 includes: a PCB board, circuit elements welded on the PCB board, and a pair of copper foils covering the PCB board, the lower surface, and opposite in shape.

There is an alternating electric field around the circuit where the fuse is located, and the copper foil is used as a capacitor, and the capacitor is located in the electric field to form a potential difference. The position of the copper foil is directly below the lower lead 104 to ensure the maximum value of the monitored electric field.

As shown in FIG. 3 , the circuit elements soldered on the PCB in the intelligent monitoring base 111 include: an electric field measurement module 301 , a first amplifier 302 , an MCU 303 , a second amplifier 304 , and a wireless module 305 .

Wherein, the input of the electric field measurement module 301 is connected to the copper foil, the output of the electric field measurement module 301 is connected to the input of the first amplifier 302, and the output of the first amplifier 302 is connected to the input of the MCU303;

The electric field measurement module 301 is used to measure the potential difference formed by the copper foil, and obtains the electric field value by detecting the magnitude of the potential difference; the electric field measurement module 301 outputs the measured electric field value to the first amplifier 302; amplified by the first amplifier 302 The signal of is input to MCU303, so that MCU303 obtains the measured electric field value.

The CT ring 112 includes: a current measuring sensor 311;

The output of the current measurement sensor 311 in the CT ring 112 is connected to the intelligent monitoring base 111, as shown in Figure 4;

Specifically, the output of the current measuring sensor 311 is connected with the input of the second amplifier 304 in the intelligent monitoring base 111, and the output of the second amplifier 304 is connected with the input of the MCU303;

The current measurement sensor 311 converts the large current in the line into a certain proportion of small current output, and realizes the real-time measurement of the current of the line where the fuse is located; the current measurement sensor 311 outputs the measured current value to the second amplifier 304; The signal amplified by the second amplifier 304 is amplified and input to the MCU 303 , so that the MCU 303 obtains the measured current value.

The wireless module 305 is connected to the MCU 303 , and the MCU 303 reports the monitored current value and electric field value to the management terminal 113 through the wireless module 305 through wireless communication. Specifically, the MCU 303 may periodically report the monitored current value and electric field value to the management terminal 113 through the wireless module 305.

The management terminal 113 can judge the situation that the fuse of the fuse is blown through the current and electric field values reported by the intelligent monitoring base 111, or the situation of a power failure on the line where the fuse is located:

If the current value reported by the intelligent monitoring base 111 of the fuse of one phase line in the three-phase line is lower than the set current threshold value, the electric field value is not lower than the set electric field threshold value, and the current reported electric field value is higher than that reported before. The decline of the electric field value is greater than the set amplitude threshold, and the current value and electric field value reported by the intelligent monitoring base of the other two fuses are normal, then the management terminal 113 judges that the fuse in the fuse of the phase line is blown, and the load The fuse tube pops up; where the current value is normal refers to the current value is not lower than the set current threshold; the electric field value is normal refers to the electric field value is not lower than the set electric field threshold, and the current Compared with the electric field value reported before, the decrease range of the reported electric field value is not greater than the set amplitude threshold.

If the current values reported by the intelligent monitoring base of the three fuses of the three-phase line are all lower than the set current threshold, the electric field values are all lower than the set electric field threshold, and the current reported electric field value is higher than the previously reported electric field value. If the drop ranges of the values are greater than the set range threshold, the management terminal 113 judges that a power outage occurs on the three-phase line.

For the scheme of supplying power to the circuit elements welded on the PCB board in the intelligent monitoring base 111, the present invention provides the following three embodiments:

Embodiment one

On the basis of the circuit structure shown in Figure 3, other circuit elements can also be included, as shown in Figure 5a; wherein, the CT ring 112 can also include: an induction power-taking sensor 312; the intelligent monitoring base 111 is welded on the PCB board The circuit components above may also include: a boost module 308 .

Wherein, the output of the inductive power-taking sensor 312 in the CT ring 112 is connected to the intelligent monitoring base 111, as shown in Figure 1; specifically, the output of the inductive power-taking sensor 312 is connected with the input of the boost module 308; the boost module The output of 308 is connected with the power lines of each circuit element in the intelligent monitoring base 111;

The inductive power-taking sensor 312 takes power from the alternating electric field and then outputs it. After the boost module 308 boosts the voltage, the boost module 308 outputs the boosted voltage to supply power for each circuit element in the intelligent monitoring base 111 .

Embodiment two

On the basis of the circuit structure shown in Figure 3, other circuit elements can also be included, as shown in Figure 5b; wherein, the CT ring 112 can also include: an induction power-taking sensor 312; the intelligent monitoring base 111 is welded on the PCB board The above circuit components may also include: a supercapacitor 306 , a diode D1 , a boost module 318 , a diode D2 , and a charge management module 309 .

Wherein, the inductive power-taking sensor 312 charges the supercapacitor 306 through the charging management module 309;

The anode of the diode D1 is connected to the output of the inductive power-taking sensor 312, and the cathode of the diode D1 is connected to the input of the boost module 318;

The anode of the diode D2 is connected to the voltage output terminal of the supercapacitor 306, and the cathode of the diode D2 is connected to the input of the boost module 318;

The output of the boost module 318 is connected to the power lines of each circuit element in the intelligent monitoring base to supply power for each circuit element.

Embodiment three

On the basis of the circuit structure shown in Figure 3, other circuit elements can also be included, as shown in Figure 5c; wherein, the CT ring 112 can also include: an induction power-taking sensor 312; the intelligent monitoring base 111 is welded on the PCB board The circuit components on the circuit may also include: a supercapacitor 306, a diode D1, a diode D2, a charge management module, a boost module 328, a backup battery 307, a diode D3, and a diode D4.

Wherein, the inductive power-taking sensor 312 charges the supercapacitor 306 through the charging management module 309;

The anode of the diode D1 is connected to the output of the inductive power-taking sensor 312, and the cathode of the diode D1 is connected to the input of the boost module 328;

The anode of the diode D2 is connected to the voltage output terminal of the supercapacitor 306, and the cathode of the diode D2 is connected to the input of the boost module 328;

The anode of the diode D3 is connected to the output of the backup battery 307, and the anode of the diode D4 is connected to the output of the boost module 328; the cathodes of the diodes D3 and D4 are connected to the power lines of each circuit element in the intelligent monitoring base, for each circuit components for power supply.

In addition, the output of the inductive power-taking sensor 312, the supercapacitor 306, and the backup battery 307 can also be connected to the MCU303. Select the appropriate power supply mode for the current fuse operation mode; the MCU 303 can also periodically report the collected output voltages of the inductive power-taking sensor 312 , the supercapacitor 306 , and the backup battery 307 to the management terminal 113 through the wireless module 305 .

Furthermore, the management terminal 113 can also judge the following abnormalities or faults through the voltage value reported by the intelligent monitoring base 111:

If the management terminal 113 confirms that the output voltages of the inductive power-taking sensor, supercapacitor, and backup battery reported by an intelligent monitoring base are all lower than the set voltage threshold, then it is judged that a low battery event occurs in the intelligent monitoring base, which is not enough to support the intelligent monitoring base. The monitoring base 111 works.

If the management terminal 113 does not receive the data reported by the intelligent monitoring base 111 for three consecutive cycles, and there is no low battery event, that is, at least the output voltage of the previously reported inductive power-taking sensor 312, supercapacitor 306, and backup battery 307 If a voltage is greater than or equal to the voltage threshold, it is determined that the intelligent monitoring base 111 has a communication failure.

Further, a fuse monitoring system provided by the present invention may further include: a system master station 114 .

The management terminal 113 can also be used to upload the judgment result made according to the data reported by the intelligent monitoring base 111 to the system main station 114 .

An intelligent fuse provided by an embodiment of the present invention includes: the above-mentioned fuse (or fuse body), an intelligent monitoring base 111 and a CT ring 112 .

Intelligent fuses can be installed on the three-phase lines A, B, and C on the primary side of the distribution network transformer, which can protect the distribution network lines, and at the same time realize the monitoring of the operating status of the fuses, as well as real-time collection of line current and electric field. Three intelligent fuses installed in A, B, and C three-phase lines form a group.

The MCU power supply selection method in the intelligent fuse can include the following rules:

Rule 1: When the measured current value is greater than 0.5A, the inductive power-taking sensor can be selected to realize online continuous power-taking, which meets the requirement of intelligent fuses to collect current and electric field data once every 5s (this interval can be set), and the interval is 5min (this interval Configurable) The basic function of reporting data to the management terminal once, at this time, the radio frequency circuit of the wireless module is turned on at regular intervals;

Rule 2: Smart fuses support real-time data reporting; when the measured current value is greater than 3A, the power supply of continuous online power supply can meet the function of immediate real-time reporting, and the radio frequency circuit that supports the wireless module is always on.

Rule 3: Prioritize the power supply mode of online continuous power acquisition. When the measured current value cannot meet the power requirements required by the operating conditions of the smart fuse and cannot complete online continuous power acquisition, use super capacitors as backup power to supply power to the equipment .

Rule 4: If the discharge voltage of the supercapacitor is lower than the threshold, the supercapacitor cannot supply power; when neither the inductive power-taking sensor nor the supercapacitor can supply power for the device, the battery is selected for power supply.

The management terminal 113 can be installed in the JP cabinet, the secondary equipment of the distribution network, etc., works with the intelligent fuse, and has the functions of data collection, analysis, abnormal reporting, and management. A management terminal can simultaneously receive the uploaded data of at least one group of fuses, so as to realize the management of at least one group of fuses. The management terminal 113 collects monitoring data of multiple sets of intelligent fuses through micro-power wireless, and analyzes and processes them through edge computing, supports local data interaction with other distribution network equipment in the form of RS232/485, and uploads the results to the system master station 114; at the same time, it supports remote 4G transmission to the system master station 114.

Through database management and reported information analysis, the system master station 114 can quickly judge the operation status of distribution network lines, generate report records and work orders, and provide reliable data support for distribution network inspection.

The fuse monitoring system of the technical solution of the present invention includes an intelligent monitoring base arranged at the bottom of the fuse, a CT ring set at the lower lead of the fuse, and a management terminal; wherein, the intelligent monitoring base It includes: a PCB board, circuit elements welded on the PCB board, and a pair of copper foils covered on the PCB board and the lower surface; the CT ring includes a current measurement sensor; the soldered on the PCB board The circuit components include: an electric field measurement module, a first amplifier, an MCU, a second amplifier, and a wireless module; wherein, the electric field measurement module is used to measure the potential difference formed by the copper foil, and output the measured electric field value to the first Amplifier; the signal amplified by the first amplifier is input to the MCU; the current measurement sensor is used to measure the current of the line where the fuse is located, and the measured current value is output to the second amplifier; the amplified signal of the second amplifier The signal is input to the MCU; the MCU reports the measured current value and electric field value to the management terminal through the wireless module; the management terminal judges that the fuse of the fuse is blown according to the reported current value and electric field value, Or a power failure occurs on the line where the fuse is located. Since it is only necessary to install an intelligent monitoring base at the bottom of the fuse and put a CT ring on the lower lead of the fuse, the structure is simple, does not affect the appearance, and is easy to install. Not only can the state of the fuse be monitored, but also the circuit Whether there are other conditions, such as power outages, etc. are monitored.

Further, in the technical solution of the present invention, the management terminal can also judge low battery events and communication failures.

The computer-readable medium in this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is exemplary only, and is not intended to imply that the scope of the present disclosure (including claims) is limited to these examples; under the idea of the present invention, the above embodiments or Combinations between technical features in different embodiments are also possible, steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not presented in detail for the sake of brevity.

Additionally, well-known power/ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided figures, for simplicity of illustration and discussion, and so as not to obscure the present invention. . Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and this also takes into account the fact that details regarding the implementation of these block diagram devices are highly dependent on the platform on which the invention is to be implemented (i.e. , these details should be well within the understanding of those skilled in the art). Where specific details (eg, circuits) have been set forth to describe example embodiments of the invention, it will be apparent to those skilled in the art that other embodiments may be implemented without or with variations from these specific details. Implement the present invention down. Accordingly, these descriptions should be regarded as illustrative rather than restrictive.

Although the invention has been described in conjunction with specific embodiments of the invention, many alternatives, modifications and variations of those embodiments will be apparent to those of ordinary skill in the art from the foregoing description. For example, other memory architectures such as dynamic RAM (DRAM) may use the discussed embodiments.

Embodiments of the present invention are intended to embrace all such alterations, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A system for monitoring a fuse disposed on a three-phase line, the system comprising:

the intelligent monitoring base is arranged at the bottom of the fuse, the CT ring is sleeved at the lower lead of the fuse, and the management terminal is arranged at the bottom of the fuse; wherein, include in the intelligent monitoring base: the PCB, the circuit element welded on the PCB, and a pair of copper foils paved on the upper surface and the lower surface of the PCB; the CT ring comprises a current measurement sensor; the circuit element welded on the PCB board comprises: the device comprises an electric field measurement module, a first amplifier, an MCU, a second amplifier and a wireless module;

the electric field measurement module is used for measuring the potential difference formed by the copper foil and outputting the measured electric field value to the first amplifier; the signal amplified by the first amplifier is input to the MCU;

the current measuring sensor is used for measuring the current of the circuit where the fuse is located and outputting the measured current value to the second amplifier; the signal amplified by the second amplifier is input to the MCU;

the MCU reports the measured current value and the electric field value to the management terminal through the wireless module; and the management terminal judges whether the fuse wire of the fuse is blown or a power failure fault occurs on a line where the fuse is located according to the reported current value and the electric field value.

2. The system of claim 1, wherein the system further comprises a controller configured to control the controller,

the management terminal is specifically configured to determine that the fuse wire in the fuse wire of the phase line is blown if the current value reported by the intelligent monitoring base of the fuse wire of the phase line is lower than the set current threshold value, the electric field value is not lower than the set electric field threshold value, the current reported electric field value is larger than the set amplitude threshold value compared with the electric field value reported before, and the current value and the electric field value reported by the intelligent monitoring base of the other two fuse wires are normal; if the current values reported by the intelligent monitoring bases of the three fuses of the three-phase line are lower than the set current threshold value, the electric field values are lower than the set electric field threshold value, and the descending amplitude of the currently reported electric field values compared with the previously reported electric field values is larger than the set amplitude threshold value, judging that the three-phase line has a power failure.

3. The system of claim 1, wherein the CT loop further comprises: an induction pickup sensor; the circuit element welded on the PCB board further comprises: a boost module;

the induction power taking sensor takes power from the alternating electric field and outputs the power, and the power is boosted by the boosting module; the boosting module outputs boosted voltage to supply power for all circuit elements in the intelligent monitoring base.

4. The system of claim 1, wherein the CT loop further comprises: an induction pickup sensor; the circuit element welded on the PCB board further comprises: the device comprises a super capacitor, a diode D1, a boosting module, a diode D2 and a charging management module;

the induction electricity taking sensor charges the super capacitor through the charging management module;

the anode of the diode D1 is connected with the output of the induction pickup sensor, and the cathode of the diode D1 is connected with the input of the boosting module;

the anode of the diode D2 is connected with the voltage output end of the super capacitor, and the cathode of the diode D2 is connected with the input of the boosting module;

the output of the boosting module is connected with the power line of each circuit element in the intelligent monitoring base to supply power for each circuit element.

5. The system of claim 1, wherein the CT loop further comprises: an induction pickup sensor; the circuit element welded on the PCB board further comprises: super capacitor, diode D1, boost module, diode D2, charge management module, standby battery, diode D3, diode D4;

the induction electricity taking sensor charges the super capacitor through the charging management module;

the anode of the diode D1 is connected with the output of the induction pickup sensor, and the cathode of the diode D1 is connected with the input of the boosting module;

the anode of the diode D2 is connected with the voltage output end of the super capacitor, and the cathode of the diode D2 is connected with the input of the boosting module;

the anode of the diode D3 is connected with the output of the standby battery, and the anode of the diode D4 is connected with the output of the boosting module; the cathodes of the diodes D3 and D4 are connected with power lines of all circuit elements in the intelligent monitoring base to supply power for all the circuit elements.

6. The system of claim 5, wherein the outputs of the inductive pickup sensor, the super capacitor, and the backup battery are all connected to the MCU; and

the MCU is also used for periodically reporting the acquired output voltage of the induction power-taking sensor, the super capacitor and the standby battery to the management terminal through the wireless module.

7. The system of claim 6, wherein the system further comprises a controller configured to control the controller,

the management terminal is also used for judging that the intelligent monitoring base has a low-power event after confirming that the output voltage of the induction power taking sensor and the super capacitor reported by the intelligent monitoring base and the output voltage of the standby battery are lower than a set voltage threshold.

8. The system of claim 7, wherein the system further comprises a controller configured to control the controller,

the management terminal is also used for judging that the intelligent monitoring base has communication faults if the data reported by the intelligent monitoring base is not received in three continuous periods and no low-power event exists.

9. The system of claim 7, further comprising: a system main station;

and the management terminal is also used for uploading a judgment result made according to the data reported by the intelligent monitoring base to the system master station.

10. An intelligent fuse, comprising: a fuse body and an intelligent monitoring base and a CT ring in a system as claimed in any one of claims 1 to 9.

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