Intelligent temperature monitoring and early warning system for cable terminal of distribution box type equipment

Abstract

The invention provides a power distribution box type equipment cable terminal intelligent temperature monitoring and early warning system, and belongs to the technical field of cable terminal parameter detection, and the system comprises a radio frequency energy transmitter which is used for transmitting radio frequency energy; the radio frequency energy receiver is used for receiving and converting the radio frequency energy into an electric signal; the temperature sensor is used for acquiring temperature information of the cable terminal; the RFID transmitting component is used for transmitting the temperature information to the outside; the RFID read-write assembly is used for receiving the temperature information sent by the RFID transmitting assembly; and the controller is used for controlling the power supply assembly to supply power to the RFID transmitting assembly and controlling the power supply duration according to the electric signal. The system has the advantages that the function of wirelessly transmitting temperature data is achieved through the RFID technology, the active RFID wireless mode is not only high in anti-interference performance and good in penetrating capacity, but also can be more conveniently installed in a place where wiring is difficult, and the active RFID powered by the power supply assembly can provide high anti-interference performance and a long transmitting distance.

Description

Technical Field

[0001] The invention belongs to the technical field of cable terminal parameter detection, and in particular relates to an intelligent temperature monitoring and early warning system for cable terminals of distribution network box-type equipment. Background Art

[0002] The connection parts of the cable terminals of distribution network box-type equipment are all metal devices. Due to changes in weather, changes in equipment foundation, processing technology and other reasons, the contact parts of the cable connection points change, causing the contact resistance to increase. When the current passes through, it will cause the temperature to rise, which will further cause equipment aging, insulation performance degradation, and even cause arc short circuits, burn equipment, and cause accidents. Therefore, temperature monitoring is the most effective and economical way to monitor the safety of distribution network box-type equipment cable terminals; At present, the temperature monitoring method for cable terminals of distribution network box-type equipment is mainly infrared temperature measurement, but infrared temperature measurement technology is easily affected by the environment, and has a greater impact on the temperature readings of bright or polished metal surfaces. It can only measure the surface temperature of objects. If it is blocked, it is difficult to well reflect the internal temperature of the measured object. Power equipment has high voltage, large current, and magnetic field interference. Therefore, a cable terminal intelligent temperature monitoring and early warning system that can wirelessly control temperature measurement and has good anti-interference performance is needed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to monitor the temperature of power equipment. In view of the shortcomings of the prior art, an intelligent temperature monitoring and early warning system for cable terminals of distribution network box-type equipment is provided, which can wirelessly control temperature measurement and has good anti-interference performance. In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a radio frequency energy transmitter, which is arranged at a remote end and is used to send radio frequency energy; a radio frequency energy receiver, which is arranged in a cable terminal and is used to receive the radio frequency energy and convert the radio frequency energy into an electrical signal; a temperature sensor, which is arranged in the cable terminal and is used to obtain temperature information of the cable terminal; an RFID transmitting component, which is arranged in the cable terminal and is connected to the output end of the temperature sensor and automatically sends the temperature information to the outside after power-on; an RFID reading and writing component, which is arranged at a remote end and is used to receive the temperature information sent by the RFID transmitting component; a power supply component, which is arranged in the cable terminal and is used to power the RFID transmitting component and the temperature sensor; a controller, which is arranged in the cable terminal and is used to receive the electrical signal and control the power supply component to power the RFID transmitting component and control the power supply duration according to the electrical signal. Furthermore, the RF energy receiver includes an antenna, the antenna is connected to a RF signal amplifier, the power supply component is configured to provide power to the RF signal amplifier, the output end of the RF signal amplifier is connected to a power recovery circuit, the power recovery circuit is connected to a voltage regulator, and the voltage regulator is connected to a controller.

[0004] Furthermore, the power supply component includes a magnetic induction power supply device, the output end of the electromagnetic induction power supply device is connected to a super capacitor, and the super capacitor is used to supply power to the temperature sensor, the RFID transmitting component and the controller.

[0005] Furthermore, resistors R1, R2 and R3 of the same resistance are connected in series in sequence between the positive power supply electrode VCC and the negative power supply electrode GND of the controller, and voltage comparators C1 and C2 are provided inside the controller, the inverting input terminal of the voltage comparator C1 is connected between the resistor R1 and the resistor R2, the non-phase input terminal of the voltage comparator C2 is connected between the resistor R2 and the resistor R3, the output terminals of the voltage comparator C1 and the voltage comparator C2 are connected to RS trigger G, the output terminal of the voltage comparator C1 is connected to the R terminal of the RS trigger G, the output terminal of the voltage comparator C2 is connected to the S terminal of the RS trigger G, the output terminal of the RS trigger G is connected to a NAND gate, the output terminal of the NAND gate is connected to a NOT gate, and the output terminal of the NOT gate is connected to a radio frequency energy receiver; A resistor R4 and a capacitor CC are connected in series between the positive power supply electrode VCC and the negative power supply electrode GND of the controller, and the positive input terminal of the voltage comparator C1 is connected between the resistor R4 and the capacitor CC; The controller is also provided with a voltage comparator C3 and a resistor R5. The positive input terminal of the voltage comparator C3 is connected between the resistor R1 and the resistor R2 by the resistor R5, the negative input terminal is connected to the RF energy receiver, and the output terminal is connected to the negative input terminal of the voltage comparator C2. The output end of the NAND gate is connected to a transistor, the base of the transistor is connected to the output end of the NAND gate, the emitter of the transistor is connected to the negative electrode of the controller, and the collector of the transistor is connected to the output end of the resistor R4.

[0006] A method for intelligent temperature monitoring and early warning of cable terminals of distribution network box-type equipment is completed based on an intelligent temperature monitoring and early warning system for cable terminals of distribution network box-type equipment, and is characterized in that it includes: a radio frequency energy transmitter sends radio frequency energy; a radio frequency energy receiver receives the radio frequency energy and converts the radio frequency energy into an electrical signal; a controller receives the electrical signal, controls the power supply component to supply power to an RFID transmitting component and controls the power supply duration according to the electrical signal; after the RFID transmitting component is powered on, uses a temperature sensor to obtain the temperature information of the cable terminal and sends it; and an RFID reading and writing component receives the temperature information sent by the RFID transmitting component.

[0007] Furthermore, the controller receives the electrical signal, and according to the electrical signal, controls the power supply component to supply power to the RFID transmitting component and controls the power supply duration, including: Control the RF energy receiver to convert the on-off control RF energy emitted by the RF energy transmitter into the on-off control of the electrical signal, and control the output result of the voltage comparator C3 through the on-off control of the electrical signal; The output result of the voltage comparator C2 is controlled by the voltage comparator C3; The output result of RS trigger G is controlled by voltage comparator C2, and RS trigger G controls the power supply for RFID transmitting component; The output result of the transistor is controlled by RS trigger G; The transistor controls the power supply of capacitor CC, and prolongs the voltage rise time of capacitor CC through resistor R4, thereby controlling the power supply time of the RFID transmitter component. When the charging voltage of capacitor CC reaches the set value, the output result of voltage comparator C1 is changed, and voltage comparator C1 controls the output result of RS trigger G.

[0008] Furthermore, the method of controlling the output result of the voltage comparator C3 includes: The electrical signal is input to the inverting input terminal of the voltage comparator C3. The power supply component adjusts the voltage to be less than the electrical signal through the resistors R1 and R5 and then inputs the voltage to the positive input terminal of the voltage comparator C3. By controlling the input result of the inverting input terminal of the voltage comparator C3, the output result of the voltage comparator C3 is controlled.

[0009] Furthermore, the method of controlling the output result of the transistor by using the RS trigger G includes: The voltage comparator C2 changes, the output result of the RS trigger G changes, the NOT gate outputs a low voltage to control the transistor to a high impedance state, and the current passes through the resistor R4 to charge the capacitor CC; The charging of capacitor CC controls the change of voltage comparator C1. Capacitor CC is charged to a voltage greater than 2 / 3VCC and sent to the positive input of voltage comparator C1. The positive input of voltage comparator C1 is greater than the negative input and outputs a high voltage to RS trigger G. RS trigger G outputs a low voltage and then outputs a high voltage after being inverted by the NOT gate. The output high voltage of the NOT gate controls the transistor to be converted into a low-resistance state. The current passes through the transistor to GND to disconnect the capacitor CC, so that the capacitor CC outputs a 0V voltage to the non-inverting input terminal of the voltage comparator C1.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The system uses RFID technology to achieve the function of wireless transmission of temperature data. Compared with the traditional wired temperature monitoring system, the active RFID wireless method not only has strong anti-interference performance and good penetration ability, but is also suitable for relatively closed spaces such as distribution network box-type equipment, has a wide signal transmission range, and can be more conveniently installed in places where wiring is difficult, and is more convenient for upgrading distribution equipment; active RFID powered by power supply components can provide higher anti-interference performance and longer transmission distance.

[0011] 2. Control the on and off of the RF energy transmitter. Since the on and off frequency of the RF signal is encoded in the RF signal, the electrical signal will also have the same on and off frequency. Control the on and off frequency of the RF energy receiver converted into an electrical signal. The power supply frequency of the power supply component is controlled by the on and off frequency of the electrical signal. The power supply duration is controlled by the controller. The controller independently controls the power supply duration of the power supply component. The control frequency and duration of the wireless signal are controlled separately. This separate control method ensures that the frequency of the RF signal and the power supply duration can be adjusted separately, thereby improving the flexibility and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0013] Figure 1 : A schematic diagram of the process of the radio frequency energy receiver in Embodiment 1 of the present invention; Figure 2 : A schematic diagram of a flow chart of a system control signal in Embodiment 1 of the present invention; Figure 3 : Schematic diagram of the initial power-on state and the discharge of the triode low-resistance grounding capacitor in embodiment 2 of the present invention; Figure 4 : Schematic diagram of the connection of the reverse input terminal of the C3 comparator in Embodiment 2 of the present invention; Figure 5 : Schematic diagram of power-off after C3 is powered on and the transistor is disconnected in Embodiment 2 of the present invention; Figure 6 : Schematic diagram of the state of C1 changing and no longer supplying power after the capacitor voltage is charged to 5V in Embodiment 2 of the present invention; DETAILED DESCRIPTION

[0014] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments and the accompanying drawings, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0015] Example 1: See Figure 1-3The present embodiment is a distribution network box type equipment cable terminal intelligent temperature monitoring and early warning system, which includes A radio frequency energy transmitter is arranged at a remote end and is used to transmit radio frequency energy, wherein the frequency of the radio frequency energy transmitter is 2.4G; A radio frequency energy receiver is arranged in the cable terminal, and is used to receive the radio frequency energy and convert the radio frequency energy into an electrical signal. The frequency of the radio frequency energy receiver is 2.4G. A temperature sensor is arranged in the cable terminal and is used to obtain temperature information of the cable terminal; The RFID transmitting component is arranged in the cable terminal, connected to the output end of the temperature sensor, and automatically sends the temperature information to the outside after power-on; The RFID reading and writing component is arranged at the remote end and is used to receive the temperature information sent by the RFID transmitting component; A power supply component, disposed in the cable terminal, for supplying power to the RFID transmitting component and the temperature sensor; The controller is arranged in the cable terminal, and is used to receive the electrical signal, and control the power supply component to supply power to the RFID transmitting component and control the power supply duration according to the electrical signal;

[0016] See also Figure 1 The RF energy receiver includes an antenna, and the antenna has multiple groups. By deploying multiple receiving antennas at different positions, spatial diversity technology is used to enhance signal strength and reduce the impact of multipath fading. The antenna is connected to a RF signal amplifier, and the power supply component is configured to provide power to the RF signal amplifier. The output end of the RF signal amplifier is connected to a power recovery circuit, and the power recovery circuit is connected to a voltage regulator, and the voltage regulator is connected to a controller; the power recovery circuit is used to receive RF energy through the antenna and convert the RF energy into an electrical signal, and the voltage regulator is used to stabilize the voltage of the electrical signal; The power supply component includes a magnetic induction power supply device and a voltage stabilizer. The output end of the electromagnetic induction power supply device is connected to a supercapacitor. The voltage stabilizer is installed at the output end of the supercapacitor to stabilize the output voltage of the power supply component. The supercapacitor is used to power the temperature sensor, RFID transmitting component and controller. The system draws power through the magnetic induction power supply device and stores electrical energy through the supercapacitor. It can work without an external power supply and is suitable for occasions where it is impossible to access the power grid or it is difficult to replace batteries.

[0017] See also Figure 3The controller is powered by a 5V power supply. Resistors R1, R2 and R3 of the same resistance are connected in series in sequence between the positive power supply VCC and the negative power supply GND of the controller. The three series resistors distribute the voltage of VCC on the three resistors according to the resistance values. A voltage comparator C1 and a voltage comparator C2 are arranged inside the controller. The inverting input end of the voltage comparator C1 is connected between the resistor R1 and the resistor R2, and the non-phase input end of the voltage comparator C2 is connected between the resistor R2 and the resistor R3. The output ends of the voltage comparator C1 and the voltage comparator C2 are connected to an RS trigger G. The output end of the voltage comparator C1 is connected to the R end of the RS trigger G, and the output end of the voltage comparator C2 is connected to the S end of the RS trigger G. The output end of the RS trigger G is connected to a NAND gate, and the output end of the NAND gate is connected to a NOT gate. The output end of the NOT gate is connected to a radio frequency energy receiver.

[0018] A resistor R4 and a capacitor CC are connected in series between the positive power supply electrode VCC and the negative power supply electrode GND of the controller. The positive input terminal of the voltage comparator C1 is connected between the resistor R4 and the capacitor CC. The charging time of the capacitor CC is controlled by setting the resistance value of the resistor R4.

[0019] The controller is also provided with a voltage comparator C3, the non-phase input end of the voltage comparator C3 is connected between the resistor R1 and the resistor R2 by means of a resistor R5, the inverting input end is connected to the radio frequency energy receiver, and the output end is connected to the inverting input end of the voltage comparator C2. The output end of the NAND gate is connected to a transistor, the base of the transistor is connected to the output end of the NAND gate, the emitter of the transistor is connected to the negative electrode GND of the controller, and the collector of the transistor is connected between the resistor R4 and the capacitor CC.

[0020] Beneficial effects: 1. The system uses RFID technology to achieve the function of wireless transmission of temperature data. Compared with the traditional wired temperature monitoring system, the active RFID wireless method not only has strong anti-interference performance and good penetration ability, but is also suitable for relatively closed spaces such as distribution network box-type equipment, has a wide signal transmission range, and can be more conveniently installed in places where wiring is difficult, and is more convenient for upgrading distribution equipment; active RFID powered by power supply components can provide higher anti-interference performance and longer transmission distance.

[0021] 2. Control the on and off of the RF energy transmitter. Since the on and off frequency of the RF signal is encoded in the RF signal, the electrical signal will also have the same on and off frequency. Control the on and off frequency of the RF energy receiver converted into an electrical signal. The power supply frequency of the power supply component is controlled by the on and off frequency of the electrical signal. The power supply duration is controlled by the controller. The controller independently controls the power supply duration of the power supply component. The control frequency and duration of the wireless signal are controlled separately. This separate control method ensures that the frequency of the RF signal and the power supply duration can be adjusted separately, thereby improving the flexibility and stability of the system.

[0022] 3. The power supply component of the system uses a radio frequency energy receiver to convert the received radio frequency energy into electrical signals, thereby controlling the power supply of the entire system; the system takes power through a magnetic induction power supply device and stores the power through a supercapacitor. It can work without an external power supply and is suitable for scenarios where it is impossible to access the power grid or it is difficult to replace the battery; 4. The use of RFID technology and wireless communication reduces the need for expensive data cables and reduces the overall cost of the system. At the same time, due to the high degree of system integration, it has less maintenance requirements.

[0023] Embodiment 2: An intelligent temperature monitoring and early warning system for cable terminals of distribution network box-type equipment, wherein the power supply component includes a photovoltaic power generation panel, and the output end of the photovoltaic power generation panel is connected to a super capacitor, and the super capacitor is used to power a temperature sensor, an RFID transmitting component and a controller; By using photovoltaic panels, in some scenarios where it is inconvenient to draw electricity through cables, it is possible to provide power for the system, ensure the normal operation of the system, and expand the system's usage scenarios.

[0024] Embodiment 3: A distribution network box-type equipment cable terminal intelligent temperature monitoring and early warning method is implemented based on the distribution network box-type equipment cable terminal intelligent temperature monitoring and early warning system as in Embodiment 1 or Embodiment 2, and it includes a temperature sensor sensing temperature and generating temperature information; The radio frequency energy transmitter transmits radio frequency energy; The radio frequency energy receiver receives the radio frequency energy and converts the radio frequency energy into an electrical signal; The controller receives the electrical signal, and controls the power supply component to supply power to the RFID transmitting component and controls the power supply duration according to the electrical signal; After the RFID transmitting component is powered on, it uses the temperature sensor to obtain the temperature information of the cable terminal and sends it; The RFID reading and writing component receives the temperature information sent by the RFID transmitting component.

[0025] Also includes: S1, by controlling the on-off of the RF energy transmitter to control the on-off of the RF energy receiver converted into an electrical signal, and by controlling the on-off of the electrical signal to control the output result of the voltage comparator C3; S2. See Figure 4 The electrical signal is input to the inverting input terminal of the voltage comparator C3, and the power supply component adjusts the voltage to be less than the electrical signal through the resistor R1 and the resistor R5 and then inputs the positive input terminal of the voltage comparator C3. The voltage comparator C3 outputs 0v to the inverting input terminal of the voltage comparator C2; S3. See Figure 3 ; When the controller is initially powered on, the power supply component divides the voltage through resistors R1, R2 and R3, and the output end of resistor R2 outputs 1 / 3 VCC voltage to the positive input end of the voltage comparator C2; S4. See Figure 3 ; When the controller is initially powered on, the output end of resistor R1 outputs 2 / 3VCC voltage to the reverse input end of voltage comparator C1, the voltage of resistor R4 is released through the transistor connected to GND, 0V voltage is input to the positive input end of voltage comparator C1, voltage comparator C1 outputs low voltage, and voltage comparator C1 outputs low voltage to the R end of RS trigger G; S5. According to the results of S1 and S2, the voltage comparator C2 outputs a high voltage. The voltage comparator C2 outputs a high voltage to the S terminal of the RS trigger G. The RS trigger G outputs a high voltage, which is inverted by the NOT gate and then outputs a low voltage. The high voltage is inverted by the NAND gate and then outputs a high voltage to power the RFID transmitter component and the temperature sensor. S6. See Figure 5 The interruption electrical signal causes the voltage comparator C3 to output a high voltage to the voltage comparator C2, causing the voltage comparator C2 to output a low voltage. The R and S terminals of the RS trigger both input a low voltage, and the RS trigger maintains the state and outputs a high voltage. S7, the NOT gate outputs a low voltage to control the transistor to be converted into a high impedance state, and the current charges the capacitor CC through the resistor R4. During charging, the NOT gate continuously outputs a high voltage; S8. See Figure 6 ; The capacitor CC is charged to a voltage greater than 2 / 3VCC to the positive input terminal of the voltage comparator C1. The positive input terminal of the voltage comparator C1 is greater than the negative input terminal and outputs a high voltage to the RS trigger G. The RS trigger G outputs a low voltage, which is inverted by the NOT gate and outputs a high voltage. The inversion of the NAND gate outputs a low voltage to stop powering the RFID transmitter component and the temperature sensor. S9. See Figure 1 The NOT gate outputs a high voltage to control the transistor to be converted into a low-resistance state, and the capacitor CC is grounded and discharged. The capacitor CC outputs a 0V voltage to the non-inverting input terminal of the voltage comparator C1, and the voltage comparator C1 outputs a low level to the R terminal of the RS trigger.

[0026] Beneficial Effects The output result of the voltage comparator C3 is controlled by the on-off control of the electrical signal, and then the output result of the RS trigger G is controlled to control the power supply for the RFID transmitting component. At the same time, the transistor is opened to charge the capacitor CC. The time it takes for the capacitor CC to charge to 2 / 3VCC voltage is the time it takes for the power supply component to power the RFID transmitting component. By setting a combination of resistor R4 with different resistance values ​​and capacitor CC with different capacities, a single electrical signal can be set to control temperature monitoring and RFID transmitting components with different working times.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An intelligent temperature monitoring and early warning system for cable terminals of distribution network box-type equipment, characterized in that: include: A radio frequency energy transmitter is arranged at a remote end and is used to transmit radio frequency energy; A radio frequency energy receiver is arranged in the cable terminal and is used to receive the radio frequency energy and convert the radio frequency energy into an electrical signal; A temperature sensor is arranged in the cable terminal and is used to obtain temperature information of the cable terminal; The RFID transmitting component is arranged in the cable terminal, connected to the output end of the temperature sensor, and automatically sends the temperature information to the outside after power-on; The RFID reading and writing component is arranged at the remote end and is used to receive the temperature information sent by the RFID transmitting component; A power supply component, disposed in the cable terminal, for supplying power to the RFID transmitting component and the temperature sensor; The controller is arranged in the cable terminal, and is used for receiving the electrical signal, and controlling the power supply component to supply power to the RFID transmitting component and controlling the power supply duration according to the electrical signal.

2. The intelligent temperature monitoring and early warning system for cable terminals of distribution network box-type equipment according to claim 1 is characterized in that: The RF energy receiver includes an antenna, the antenna is connected to a RF signal amplifier, the power supply component is configured to provide power to the RF signal amplifier, the output end of the RF signal amplifier is connected to a power recovery circuit, the power recovery circuit is connected to a voltage regulator, and the voltage regulator is connected to a controller.

3. The intelligent temperature monitoring and early warning system for cable terminals of distribution network box-type equipment according to claim 1 is characterized in that: The power supply component includes a magnetic induction power supply device, the output end of the electromagnetic induction power supply device is connected to a super capacitor, and the super capacitor is used to supply power to the temperature sensor, the RFID transmitting component and the controller.

4. The intelligent temperature monitoring and early warning system for cable terminals of distribution network box-type equipment according to claim 1 is characterized in that: Resistors R1, R2 and R3 of the same resistance are connected in series in sequence between the positive power supply electrode VCC and the negative power supply electrode GND of the controller. Voltage comparators C1 and C2 are provided inside the controller. The inverting input terminal of the voltage comparator C1 is connected between the resistors R1 and R2, and the non-inverting input terminal of the voltage comparator C2 is connected between the resistors R2 and R3. The output terminals of the voltage comparator C1 and C2 are connected to RS triggers G, the output terminal of the voltage comparator C1 is connected to the R terminal of the RS trigger G, the output terminal of the voltage comparator C2 is connected to the S terminal of the RS trigger G, the output terminal of the RS trigger G is connected to a NAND gate, the output terminal of the NAND gate is connected to a NOT gate, and the output terminal of the NOT gate is connected to a radio frequency energy receiver; A resistor R4 and a capacitor CC are connected in series between the positive power supply electrode VCC and the negative power supply electrode GND of the controller, and the positive input terminal of the voltage comparator C1 is connected between the resistor R4 and the capacitor CC; The controller is also provided with a voltage comparator C3 and a resistor R5. The positive input terminal of the voltage comparator C3 is connected between the resistor R1 and the resistor R2 by the resistor R5, the negative input terminal is connected to the RF energy receiver, and the output terminal is connected to the negative input terminal of the voltage comparator C2. The output end of the NAND gate is connected to a transistor, the base of the transistor is connected to the output end of the NAND gate, the emitter of the transistor is connected to the negative electrode of the controller, and the collector of the transistor is connected to the output end of the resistor R4.

5. A distribution network box-type equipment cable terminal intelligent temperature monitoring and early warning method, based on the distribution network box-type equipment cable terminal intelligent temperature monitoring and early warning system as claimed in claim 4, characterized in that: include: The RF energy transmitter transmits RF energy; The radio frequency energy receiver receives the radio frequency energy and converts the radio frequency energy into an electrical signal; The controller receives the electrical signal, and controls the power supply component to supply power to the RFID transmitting component and controls the power supply duration according to the electrical signal; After the RFID transmitting component is powered on, it uses the temperature sensor to obtain the temperature information of the cable terminal and sends it; The RFID reading and writing component receives the temperature information sent by the RFID transmitting component.

6. The intelligent temperature monitoring and early warning method for cable terminals of distribution network box-type equipment according to claim 5 is characterized in that: The method in which the controller receives the electrical signal and controls the power supply component to supply power to the RFID transmitting component and controls the power supply duration according to the electrical signal includes: Control the RF energy receiver to convert the on-off control RF energy emitted by the RF energy transmitter into the on-off control of the electrical signal, and control the output result of the voltage comparator C3 through the on-off control of the electrical signal; The output result of the voltage comparator C2 is controlled by the voltage comparator C3; The output result of RS trigger G is controlled by voltage comparator C2, and RS trigger G controls the power supply for RFID transmitting component; The output result of the transistor is controlled by RS trigger G; The transistor controls the power supply of capacitor CC, and prolongs the voltage rise time of capacitor CC through resistor R4, thereby controlling the power supply time of the RFID transmitter component. When the charging voltage of capacitor CC reaches the set value, the output result of voltage comparator C1 is changed, and voltage comparator C1 controls the output result of RS trigger G.

7. The intelligent temperature monitoring and early warning method for cable terminals of distribution network box-type equipment according to claim 6 is characterized in that: The method for controlling the output result of the voltage comparator C3 includes: The electrical signal is input to the inverting input terminal of the voltage comparator C3. The power supply component adjusts the voltage to be less than the electrical signal through the resistors R1 and R5 and then inputs the voltage to the positive input terminal of the voltage comparator C3. By controlling the input result of the inverting input terminal of the voltage comparator C3, the output result of the voltage comparator C3 is controlled.

8. The intelligent temperature monitoring and early warning method for cable terminals of distribution network box-type equipment according to claim 6 is characterized in that: The method of controlling the output result of the transistor by RS trigger G includes: The voltage comparator C2 changes, the output result of the RS trigger G changes, the NOT gate outputs a low voltage to control the transistor to a high impedance state, and the current passes through the resistor R4 to charge the capacitor CC; The charging of capacitor CC controls the change of voltage comparator C1. Capacitor CC is charged to a voltage greater than 2 / 3VCC and sent to the positive input of voltage comparator C1. The positive input of voltage comparator C1 is greater than the negative input and outputs a high voltage to RS trigger G. RS trigger G outputs a low voltage and then outputs a high voltage after being inverted by the NOT gate. The output high voltage of the NOT gate controls the transistor to be converted into a low-resistance state. The current passes through the transistor to GND to disconnect the capacitor CC, so that the capacitor CC outputs a 0V voltage to the positive input terminal of the voltage comparator C1.

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