Power equipment information detection system

Abstract

The invention discloses a power equipment information detection system, and relates to the field of electrical variable measurement, and the system comprises a power equipment working module which is used for the working of power equipment; the current acquisition and conversion module is used for acquiring current flowing through power equipment, converting the current into a voltage signal, obtaining real-time voltage and outputting the real-time voltage to the safety detection and protection module; the threshold automatic change module is used for automatically adjusting the threshold voltage based on the altitude and outputting the threshold voltage to the safety detection protection module; compared with the prior art, the power distribution cabinet has the beneficial effects that the power distribution cabinet innovatively constructs dynamic threshold setting with altitude self-adaption, and the designed threshold automatic change module senses altitude parameters in real time and dynamically adjusts the action threshold voltage of the circuit breaker, so that the power distribution cabinet is high in reliability and high in reliability. The electric arc reignition risk of a traditional fixed threshold value scheme in a high-altitude scene is fundamentally solved.

Description

Technical Field

[0001] The present invention relates to the field of measuring electrical variables, and specifically to an information detection system for power equipment. Background Art

[0002] Existing circuit breaker protection mechanisms usually set the rated breaking current setting value based on sea-level operating conditions, and perform a breaking operation when the circuit current exceeds a preset threshold. However, in high-altitude areas, as the air density decreases and the heat dissipation conditions deteriorate with the increase in altitude, the actual breaking current capacity of the circuit breaker decreases. If the parameter configuration of low-altitude areas is directly used, it may cause the circuit breaker to be unable to effectively cut off the arc, resulting in malignant faults such as arc reignition and even contact welding, and there is a systematic risk of fault expansion, which needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to provide an information detection system for power equipment to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] An information detection system for power equipment, comprising:

[0006] A power equipment working module for the operation of power equipment;

[0007] A current acquisition and conversion module for acquiring the magnitude of the current flowing through the power equipment, converting it into a voltage signal, obtaining a real-time voltage, and outputting it to the safety detection and protection module;

[0008] A threshold automatic change module for automatically adjusting the magnitude of the threshold voltage based on the altitude and outputting the threshold voltage to the safety detection and protection module;

[0009] A safety detection and protection module for comparing the magnitudes of the real-time voltage and the threshold voltage to select whether to disconnect the operating voltage of the power equipment working module;

[0010] A fault detection module for detecting whether the threshold voltage is abnormal;

[0011] The output end of the power equipment working module is connected to the input end of the current acquisition and conversion module, the output end of the current acquisition and conversion module is connected to the first input end of the safety detection and protection module, and the output end of the threshold automatic change module is connected to the second input end of the safety detection and protection module and the input end of the fault detection module.

[0012] As a further solution of the present invention: The power equipment working module includes a first switch, an electrical device, and a first resistor. One end of the first switch is connected to the DC power supply, the other end of the first switch is connected to one end of the electrical device, the other end of the electrical device is connected to one end of the first resistor and the input end of the current acquisition and conversion module, and the other end of the first resistor is grounded.

[0013] As a further solution of the present invention: The power equipment working module includes a first switch, an electrical device, and a mutual inductor. One end of the first switch is connected to the live wire, the other end of the first switch is connected to one end of the electrical device, the other end of the electrical device is connected to the neutral wire, the mutual inductor collects the magnitude of the current flowing through the electrical device, one end of the mutual inductor is grounded, and the other end of the mutual inductor is connected to the input end of the current acquisition and conversion module.

[0014] As a further solution of the present invention: The current acquisition and conversion module includes a second resistor, a third resistor, a fourth resistor, a first diode, and a first capacitor. One end of the second resistor is connected to the output end of the power equipment working module, the other end of the second resistor is connected to one end of the third resistor and the positive electrode of the first diode, the other end of the third resistor is grounded, the negative electrode of the first diode is connected to one end of the first capacitor, one end of the fourth resistor, and the first input end of the safety detection and protection module, the other end of the first capacitor is grounded, and the other end of the fourth resistor is grounded.

[0015] As a further solution of the present invention: The threshold automatic change module includes:

[0016] A constant voltage unit for outputting a constant voltage to supply the threshold voltage output unit;

[0017] A variable voltage unit for increasing the variable voltage supplied to the threshold voltage output unit as the altitude increases;

[0018] A threshold voltage output unit for subtracting the variable voltage from the constant voltage and outputting the threshold voltage to the safety detection and protection module;

[0019] The output end of the constant voltage unit is connected to the first input end of the threshold voltage output unit, the output end of the variable voltage unit is connected to the second input end of the threshold voltage output unit, and the output end of the threshold voltage output unit is connected to the second input end of the safety detection and protection module and the input end of the fault detection module.

[0020] As a further solution of the present invention: The constant voltage unit includes an eighth resistor and a ninth resistor. One end of the eighth resistor is connected to the working voltage, the other end of the eighth resistor is connected to one end of the ninth resistor and the first input end of the threshold voltage output unit, and the other end of the ninth resistor is grounded.

[0021] As a further solution of the present invention: The variable voltage unit includes a piezoresistive pressure sensor, a second capacitor, a fifth resistor, a sixth resistor, a seventh resistor, a first amplifier, and a third capacitor. One end of the piezoresistive pressure sensor is connected to the operating voltage, and the second end of the piezoresistive pressure sensor is connected to one end of the second capacitor, one end of the fifth resistor, and the non-inverting input terminal of the first amplifier. The other end of the second capacitor is grounded, the other end of the fifth resistor is grounded, the inverting input terminal of the first amplifier is connected to one end of the sixth resistor and one end of the seventh resistor. The other end of the sixth resistor is grounded, and the other end of the seventh resistor is connected to the output terminal of the first amplifier, one end of the third capacitor, and the second input terminal of the threshold voltage output unit. The other end of the third capacitor is grounded.

[0022] As a further solution of the present invention: The threshold voltage output unit includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second amplifier, and a fourth capacitor. The inverting input terminal of the second amplifier is connected to one end of the tenth resistor and one end of the thirteenth resistor. The other end of the tenth resistor is connected to the output terminal of the variable voltage unit. The non-inverting input terminal of the second amplifier is connected to one end of the eleventh resistor and one end of the twelfth resistor. The other end of the twelfth resistor is grounded, the other end of the eleventh resistor is connected to the output terminal of the constant voltage unit. The output terminal of the second amplifier is connected to the other end of the thirteenth resistor, one end of the fourth capacitor, the second input terminal of the safety detection and protection module, and the input terminal of the fault detection module. The other end of the fourth capacitor is grounded.

[0023] As a further solution of the present invention: The safety detection and protection module includes a fourteenth resistor, a fifteenth resistor, a fourth amplifier, a second switch, a sixteenth resistor, a seventeenth resistor, a first thyristor, a first relay, and a second diode. One end of the fourteenth resistor is connected to the output terminal of the current acquisition and conversion module, one end of the fifteenth resistor is connected to the output terminal of the threshold automatic change module. The other end of the fourteenth resistor is connected to the non-inverting input terminal of the third amplifier, the other end of the fifteenth resistor is connected to the inverting input terminal of the third amplifier. The output terminal of the third amplifier is connected to one end of the second switch. The other end of the second switch is connected to one end of the sixteenth resistor and the control electrode of the first thyristor. The other end of the sixteenth resistor is grounded. The cathode of the first thyristor is connected to one end of the seventeenth resistor, the other end of the seventeenth resistor is grounded. The anode of the first thyristor is connected to one end of the first relay and the anode of the second diode. The other end of the first relay is connected to the cathode of the second diode and the operating voltage.

[0024] As a further solution of the present invention: The fault detection module includes a plurality of fault detection units. Each fault detection unit includes a fourth amplifier, a third diode, and an eighteenth resistor. The non-inverting input terminal of the fourth amplifier is connected to the output terminal of the threshold automatic change module, the inverting input terminal of the fourth amplifier is connected to the reference voltage, the output terminal of the fourth amplifier is connected to the anode of the third diode, the cathode of the third diode is connected to one end of the eighteenth resistor, and the other end of the eighteenth resistor is grounded. The difference between different fault detection units lies in the different magnitudes of the connected reference voltages.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention innovatively constructs a dynamic threshold setting with altitude adaptability. The designed threshold automatic change module can sense altitude parameters in real time and dynamically adjust the action threshold voltage of the circuit breaker, fundamentally solving the risk of arc re-ignition in the traditional fixed threshold scheme in high-altitude scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a power equipment information detection system.

[0027] Figure 2 It is a circuit diagram of the power equipment working module under DC power supply.

[0028] Figure 3 It is a circuit diagram of the power equipment working module under AC power supply.

[0029] Figure 4 It is a circuit diagram of the current acquisition and conversion module.

[0030] Figure 5 It is a circuit diagram of the threshold automatic change module.

[0031] Figure 6 It is a circuit diagram of the safety detection and protection module.

[0032] Figure 7 It is a circuit diagram of the fault detection module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1 , a power equipment information detection system, including:

[0035] The power equipment working module 1 is used for the operation of the power equipment;

[0036] The current acquisition and conversion module 2 is used to acquire the magnitude of the current flowing through the power equipment, convert it into a voltage signal, obtain the real-time voltage, and output it to the safety detection and protection module 4;

[0037] The threshold automatic change module 3 is used to automatically adjust the magnitude of the threshold voltage based on the altitude and output the threshold voltage to the safety detection and protection module 4;

[0038] The safety detection and protection module 4 is used to compare the magnitudes of the real-time voltage and the threshold voltage to select whether to disconnect the operating voltage VCC of the power equipment working module 1;

[0039] The fault detection module 5 is used to detect whether the threshold voltage is abnormal;

[0040] The output end of the power equipment working module 1 is connected to the input end of the current acquisition and conversion module 2. The output end of the current acquisition and conversion module 2 is connected to the first input end of the safety detection and protection module 4. The output end of the threshold automatic change module 3 is connected to the second input end of the safety detection and protection module 4 and the input end of the fault detection module 5.

[0041] In this embodiment: Please refer to Figure 2 , the power equipment working module 1 includes a first switch S1, an electrical device Y, and a first resistor R1. One end of the first switch S1 is connected to the DC power supply VDD. The other end of the first switch S1 is connected to one end of the electrical device Y. The other end of the electrical device Y is connected to one end of the first resistor R1 and the input end of the current acquisition and conversion module 2. The other end of the first resistor R1 is grounded.

[0042] When the first switch S1 is closed, the voltage output by the DC power supply VDD forms a loop through the first switch S1, the electrical device Y, the first resistor R1, and the grounding terminal. The electrical device Y is powered on and works. The voltage on the first resistor R1 reflects the magnitude of the current flowing through the electrical device Y and is output to the current acquisition and conversion module 2.

[0043] In another embodiment: The first resistor R1 can also be arranged between the first switch S1 and the electrical device Y. At this time, by collecting the voltage difference on the first resistor R1, the magnitude of the current flowing through the electrical device Y can also be reflected.

[0044] In this embodiment: Please refer to Figure 3 , the power equipment working module 1 includes a first switch S1, an electrical device Y, and a mutual inductor H1. One end of the first switch S1 is connected to the live wire L. The other end of the first switch S1 is connected to one end of the electrical device Y. The other end of the electrical device Y is connected to the neutral wire N. The mutual inductor H1 collects the magnitude of the current flowing through the electrical device Y. One end of the mutual inductor H1 is grounded. The other end of the mutual inductor H1 is connected to the input end of the current acquisition and conversion module 2.

[0045] When the first switch S1 is closed, the live wire L, the first switch S1, the electrical equipment Y, and the neutral wire N form a loop, and the electrical equipment Y is powered on and operates. The current magnitude flowing through the electrical equipment Y is collected by the current transformer H1 and output to the current acquisition and conversion module 2.

[0046] In another embodiment: The electrical equipment Y can also be a device with a three-phase alternating current working power supply.

[0047] In this embodiment: Please refer to Figure 4 , the current acquisition and conversion module 2 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, and a first capacitor C1. One end of the second resistor R2 is connected to the output end of the power equipment working module 1, and the other end of the second resistor R2 is connected to one end of the third resistor R3 and the positive electrode of the first diode D1. The other end of the third resistor R3 is grounded. The negative electrode of the first diode D1 is connected to one end of the first capacitor C1, one end of the fourth resistor R4, and the first input end of the safety detection and protection module 4. The other end of the first capacitor C1 is grounded, and the other end of the fourth resistor R4 is grounded.

[0048] Regardless of whether the electrical equipment Y is powered by direct current or alternating current (including three-phase alternating current power supply), the common point A3 is divided by the second resistor R2 and the third resistor R3, rectified by the first diode D1, and filtered by the first capacitor C1. Finally, the real-time voltage (common point A4) formed on the fourth resistor R4 reflects the current magnitude flowing through the electrical equipment Y.

[0049] In another embodiment: The third resistor R3 can be replaced with a potentiometer, which can facilitate the adjustment of the real-time voltage magnitude.

[0050] In this embodiment: Please refer to Figure 5 , the threshold automatic change module 3 includes:

[0051] A constant voltage unit for outputting a constant voltage to supply the threshold voltage output unit;

[0052] A variable voltage unit for increasing the variable voltage supplied to the threshold voltage output unit as the altitude increases;

[0053] A threshold voltage output unit for subtracting the variable voltage from the constant voltage and outputting the threshold voltage to the safety detection and protection module 4;

[0054] The output end of the constant voltage unit is connected to the first input end of the threshold voltage output unit. The output end of the variable voltage unit is connected to the second input end of the threshold voltage output unit. The output end of the threshold voltage output unit is connected to the second input end of the safety detection and protection module 4 and the input end of the fault detection module 5.

[0055] In this embodiment: Please refer toFigure 5 , the constant voltage unit includes an eighth resistor R8 and a ninth resistor R9. One end of the eighth resistor R8 is connected to the working voltage VCC, and the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9 and the first input end of the threshold voltage output unit. The other end of the ninth resistor R9 is grounded.

[0056] The working voltage VCC is divided by the eighth resistor R8 and the ninth resistor R9, and the voltage on the ninth resistor R9 is the constant voltage, which is output to the threshold voltage output unit. The working voltage VCC can be converted from 220V alternating current. The specific process is that 220V alternating current is changed into direct current through a transformer, and then through a rectifier and a filter to become stable direct current, and finally through a voltage regulator to become a constant voltage as the working voltage VCC.

[0057] In another embodiment: A constant voltage can also be obtained through devices such as a voltage regulator.

[0058] In this embodiment: Please refer to Figure 5 , the variable voltage unit includes a piezoresistive pressure sensor X, a second capacitor C2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first amplifier U1, and a third capacitor C3. One end of the piezoresistive pressure sensor X is connected to the working voltage VCC, and the second end of the piezoresistive pressure sensor X is connected to one end of the second capacitor C2, one end of the fifth resistor R5, and the non-inverting input end of the first amplifier U1. The other end of the second capacitor C2 is grounded, the other end of the fifth resistor R5 is grounded, the inverting input end of the first amplifier U1 is connected to one end of the sixth resistor R6 and one end of the seventh resistor R7. The other end of the sixth resistor R6 is grounded, and the other end of the seventh resistor R7 is connected to the output end of the first amplifier U1, one end of the third capacitor C3, and the second input end of the threshold voltage output unit. The other end of the third capacitor C3 is grounded.

[0059] The piezoresistive pressure sensor X is a MEMS device based on the principle of semiconductor piezoresistive effect. It converts the air pressure change into a resistance value change through a silicon-based sensitive element, and has the characteristics of high sensitivity, low power consumption and miniaturization. It is widely used in fields such as air pressure detection, altitude measurement and pressure monitoring of closed containers. Therefore, at different altitudes, the resistance value of the piezoresistive pressure sensor X is different, and the higher the altitude, the smaller the resistance value. Therefore, the voltage on the fifth resistor R5 increases with the increase of altitude. After the voltage on the fifth resistor R5 is amplified by the first amplifier U1, the voltage at the common point A1 is the variable voltage. By adjusting the resistance values of the sixth resistor R6 and the seventh resistor R7, the magnitude of the variable voltage is adjusted so that the variable voltage corresponds to the constant voltage and the altitude change.

[0060] In another embodiment: Other methods can be used to amplify the voltage on the fifth resistor R5, such as a boost-type DC-DC converter, a BOOST boost circuit, etc.

[0061] In this embodiment: Please refer to Figure 5 , the threshold voltage output unit includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a second amplifier U2, and a fourth capacitor C4. The inverting terminal of the second amplifier U2 is connected to one end of the tenth resistor R10 and one end of the thirteenth resistor R13. The other end of the tenth resistor R10 is connected to the output terminal of the variable voltage unit. The non-inverting terminal of the second amplifier U2 is connected to one end of the eleventh resistor R11 and one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is grounded. The other end of the eleventh resistor R11 is connected to the output terminal of the constant voltage unit. The output terminal of the second amplifier U2 is connected to the other end of the thirteenth resistor R13, one end of the fourth capacitor C4, the second input terminal of the safety detection and protection module 4, and the input terminal of the fault detection module 5. The other end of the fourth capacitor C4 is grounded.

[0062] The atmospheric pressure approximately decreases exponentially with the increase of altitude, but linear simplification calculation is often used in engineering. Empirical formula: For every approximately 100 meters increase in altitude, the atmospheric pressure drops by about 12 hPa (1.2 kPa).

[0063] According to the IEC 62271-1 standard, for every 100 meters increase in altitude, the breaking capacity of the circuit breaker needs to be reduced by about 1% (that is, the correction factor is 1 - H / 10000, where H is the altitude in meters).

[0064] That is, I(H altitude) = I(0 altitude) * (1 - H / 10000). When the altitude is 3000 meters, the correction factor is 1 - 3000 / 10000 = 0.7. If the rated breaking current of the circuit breaker is 0.3A, the actual breaking capacity becomes 0.3A * 0.7 = 0.21A. To ensure the reliable operation of the circuit breaker when the breaking capacity decreases, it is necessary to reduce the operating current threshold of the protection device, and the corresponding set threshold voltage can be changed from 30V to 21V.

[0065] Here, the second amplifier U2 constructs a subtraction circuit, making the tenth resistor R10 and the thirteenth resistor R13 of equal size. The threshold voltage at the common point A2 = constant voltage - variable voltage. Here, by changing the threshold voltage, the circuit breaker can cut off the arc at the threshold current.

[0066] In another embodiment: Since the connection of the power supply terminal of the amplifier is a common function and is omitted in the figure, the connection relationship of the amplifier power supply terminal can be added.

[0067] In this embodiment: Please refer to Figure 6, the safety detection and protection module 4 includes the fourteenth resistor R14, the fifteenth resistor R15, the fourth amplifier U4, the second switch S2, the sixteenth resistor R16, the seventeenth resistor R17, the first thyristor Z1, the first relay J1, and the second diode D2. One end of the fourteenth resistor R14 is connected to the output end of the current acquisition and conversion module 2, and one end of the fifteenth resistor R15 is connected to the output end of the threshold automatic change module 3. The other end of the fourteenth resistor R14 is connected to the non-inverting input end of the third amplifier U3, and the other end of the fifteenth resistor R15 is connected to the inverting input end of the third amplifier U3. The output end of the third amplifier U3 is connected to one end of the second switch S2, and the other end of the second switch S2 is connected to one end of the sixteenth resistor R16 and the control electrode of the first thyristor Z1. The other end of the sixteenth resistor R16 is grounded. The negative electrode of the first thyristor Z1 is connected to one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is grounded. The positive electrode of the first thyristor Z1 is connected to one end of the first relay J1 and the positive electrode of the second diode D2. The other end of the first relay J1 is connected to the negative electrode of the second diode D2 and the working voltage VCC.

[0068] When the real-time voltage is greater than the threshold voltage, the voltage at the non-inverting input end of the third amplifier U3 is higher than the voltage at the inverting input end. The third amplifier U3 outputs a high level, which triggers the first thyristor Z1 to conduct through the second switch S2. The first relay J1 is energized to work, controlling the first switch S1 to disconnect, and the electrical device Y stops working to protect the electrical safety.

[0069] In another embodiment: An alarm circuit can be added to give an alarm prompt when controlling the electrical device Y to disconnect.

[0070] In this embodiment: Please refer to Figure 7 , the fault detection module 5 includes multiple fault detection units. The fault detection unit includes the fourth amplifier U4, the third diode D3, and the eighteenth resistor R18. The non-inverting input end of the fourth amplifier U4 is connected to the output end of the threshold automatic change module 3, the inverting input end of the fourth amplifier U4 is connected to the reference voltage, the output end of the fourth amplifier U4 is connected to the positive electrode of the third diode D3, the negative electrode of the third diode D3 is connected to one end of the eighteenth resistor R18, and the other end of the eighteenth resistor R18 is grounded. The difference between different fault detection units lies in the different magnitudes of the connected reference voltages ( Figure 7 There are three reference voltages in

[0071] The piezoresistive pressure sensor X changes its resistance based on pressure changes. Therefore, when an instantaneous air pressure (such as blowing air) is applied to the air vent of the piezoresistive pressure sensor X, observe the voltage change at the output end. Under normal sensitivity, the voltage should have obvious fluctuations (such as a change of 50 - 200 mV). If there is no response, it may indicate that the diaphragm is damaged or the circuit fails, and thus whether it is abnormal can be judged. Here, a fault detection module 5 is set. When detecting whether the piezoresistive pressure sensor X is abnormal, the threshold voltage at the common point A2 is synchronously detected. When the resistance of the piezoresistive pressure sensor X changes and the threshold automatic change module 3 is not faulty, the voltage change at the common point A2 causes the output level of the fourth amplifier U4 in some of the fault detection units to change from a high level to a low level, and the corresponding third diode D3 changes from emitting light to extinguishing. Therefore, when detecting whether the piezoresistive pressure sensor X is faulty, the fault of the threshold automatic change module 3 can be synchronously judged by observing the extinguishing status of the light-emitting diode of the fault detection module 5.

[0072] In another embodiment, a voltmeter can also be set to detect the voltage information of the common point A2 to judge whether the threshold automatic change module 3 is faulty.

[0073] The working principle of the present invention is as follows: The power equipment working module 1 is used for the power equipment to work; the current acquisition and conversion module 2 is used to collect the magnitude of the current flowing through the power equipment, convert it into a voltage signal, obtain the real-time voltage, and output it to the safety detection and protection module 4; the threshold automatic change module 3 is used to automatically adjust the magnitude of the threshold voltage based on the altitude and output the threshold voltage to the safety detection and protection module 4 (the constant voltage unit is used to output a constant voltage to supply the threshold voltage output unit; the variable voltage unit is used to increase the variable voltage supplied to the threshold voltage output unit as the altitude increases; the threshold voltage output unit is used to subtract the variable voltage from the constant voltage and output the threshold voltage to the safety detection and protection module 4); the safety detection and protection module 4 is used to compare the magnitudes of the real-time voltage and the threshold voltage to select whether to disconnect the working voltage VCC of the power equipment working module 1; the fault detection module 5 is used to detect whether the threshold voltage is abnormal.

[0074] In view of the limitations of traditional power equipment protection mechanisms in high-altitude areas, the present invention proposes a power equipment information detection system. In a high-altitude environment, the decrease in air density leads to a decline in the heat dissipation capacity of circuit breakers. The traditional fixed-threshold scheme cannot adapt to this change, and serious faults such as arc reignition and contact welding may occur due to insufficient breaking capacity. To solve this problem, the system dynamically adjusts the action threshold voltage by a threshold automatic change module that senses altitude parameters in real time. Specifically, the current acquisition and conversion module converts the real-time current into real-time voltage. The threshold automatic change module combines the altitude data detected by a piezoresistive barometric pressure sensor to generate a dynamic threshold voltage that decreases with the increase in altitude. The safety detection and protection module accurately controls the operation of the circuit breaker by comparing the real-time voltage with the threshold voltage to ensure reliable interruption of fault current in high-altitude scenarios. In addition, the fault detection module monitors the abnormal situation in the threshold generation process to further improve the reliability of the system. This design fundamentally overcomes the defects of the fixed-threshold scheme, significantly reduces the safety risks of power equipment in high-altitude areas, and at the same time reduces the maintenance costs and power outage losses caused by misoperation or protection failure, which has important engineering value for improving the power grid stability and power consumption safety in complex environments.

[0075] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0076] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An information detection system for power equipment, characterized in that, The power equipment information detection system includes: A power equipment working module for the operation of power equipment; A current acquisition and conversion module for acquiring the magnitude of the current flowing through the power equipment, converting it into a voltage signal, obtaining the real-time voltage, and outputting it to the safety detection and protection module; A threshold automatic change module for automatically adjusting the magnitude of the threshold voltage based on the altitude and outputting the threshold voltage to the safety detection and protection module; A safety detection and protection module for comparing the magnitudes of the real-time voltage and the threshold voltage to select whether to disconnect the working voltage of the power equipment working module; A fault detection module for detecting whether the threshold voltage is abnormal; The output end of the power equipment working module is connected to the input end of the current acquisition and conversion module, the output end of the current acquisition and conversion module is connected to the first input end of the safety detection and protection module, and the output end of the threshold automatic change module is connected to the second input end of the safety detection and protection module and the input end of the fault detection module.

2. The power equipment information detection system according to claim 1, wherein The power equipment working module includes a first switch, an electrical device, and a first resistor. One end of the first switch is connected to the DC power supply, the other end of the first switch is connected to one end of the electrical device, the other end of the electrical device is connected to one end of the first resistor and the input end of the current acquisition and conversion module, and the other end of the first resistor is grounded.

3. The power equipment information detection system according to claim 1, characterized in that The power equipment working module includes a first switch, an electrical device, and a current transformer. One end of the first switch is connected to the live wire, the other end of the first switch is connected to one end of the electrical device, the other end of the electrical device is connected to the neutral wire, the current transformer acquires the magnitude of the current flowing through the electrical device, one end of the current transformer is grounded, and the other end of the current transformer is connected to the input end of the current acquisition and conversion module.

4. The power equipment information detection system according to claim 1, wherein The current acquisition and conversion module includes a second resistor, a third resistor, a fourth resistor, a first diode, and a first capacitor. One end of the second resistor is connected to the output end of the power equipment working module, the other end of the second resistor is connected to one end of the third resistor and the positive electrode of the first diode, the other end of the third resistor is grounded, the negative electrode of the first diode is connected to one end of the first capacitor, one end of the fourth resistor, and the first input end of the safety detection and protection module, the other end of the first capacitor is grounded, and the other end of the fourth resistor is grounded.

5. The power equipment information detection system according to claim 1, wherein The threshold automatic change module includes: A constant voltage unit for outputting a constant voltage to supply the threshold voltage output unit; A variable voltage unit for increasing the variable voltage supplied to the threshold voltage output unit as the altitude increases; A threshold voltage output unit for subtracting the variable voltage from the constant voltage and outputting the threshold voltage to the safety detection and protection module; The output end of the constant voltage unit is connected to the first input end of the threshold voltage output unit, the output end of the variable voltage unit is connected to the second input end of the threshold voltage output unit, and the output end of the threshold voltage output unit is connected to the second input end of the safety detection and protection module and the input end of the fault detection module.

6. The power equipment information detection system according to claim 5, wherein The constant voltage unit includes an eighth resistor and a ninth resistor. One end of the eighth resistor is connected to the working voltage, the other end of the eighth resistor is connected to one end of the ninth resistor and the first input end of the threshold voltage output unit, and the other end of the ninth resistor is grounded.

7. The power equipment information detection system according to claim 5, characterized in that The variable voltage unit includes a piezoresistive pressure sensor, a second capacitor, a fifth resistor, a sixth resistor, a seventh resistor, a first amplifier, and a third capacitor. One end of the piezoresistive pressure sensor is connected to the operating voltage, and the second end of the piezoresistive pressure sensor is connected to one end of the second capacitor, one end of the fifth resistor, and the non-inverting input terminal of the first amplifier. The other end of the second capacitor is grounded, the other end of the fifth resistor is grounded, the inverting input terminal of the first amplifier is connected to one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is grounded, and the other end of the seventh resistor is connected to the output terminal of the first amplifier, one end of the third capacitor, and the second input terminal of the threshold voltage output unit. The other end of the third capacitor is grounded.

8. The power equipment information detection system according to claim 7, wherein The threshold voltage output unit includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second amplifier, and a fourth capacitor. The inverting input terminal of the second amplifier is connected to one end of the tenth resistor and one end of the thirteenth resistor. The other end of the tenth resistor is connected to the output terminal of the variable voltage unit. The non-inverting input terminal of the second amplifier is connected to one end of the eleventh resistor and one end of the twelfth resistor. The other end of the twelfth resistor is grounded. The other end of the eleventh resistor is connected to the output terminal of the constant voltage unit. The output terminal of the second amplifier is connected to the other end of the thirteenth resistor, one end of the fourth capacitor, the second input terminal of the safety detection and protection module, and the input terminal of the fault detection module. The other end of the fourth capacitor is grounded.

9. The power equipment information detection system according to claim 1, wherein The safety detection and protection module includes a fourteenth resistor, a fifteenth resistor, a fourth amplifier, a second switch, a sixteenth resistor, a seventeenth resistor, a first thyristor, a first relay, and a second diode. One end of the fourteenth resistor is connected to the output terminal of the current acquisition and conversion module. One end of the fifteenth resistor is connected to the output terminal of the threshold automatic change module. The other end of the fourteenth resistor is connected to the non-inverting input terminal of the third amplifier. The other end of the fifteenth resistor is connected to the inverting input terminal of the third amplifier. The output terminal of the third amplifier is connected to one end of the second switch. The other end of the second switch is connected to one end of the sixteenth resistor and the control electrode of the first thyristor. The other end of the sixteenth resistor is grounded. The negative electrode of the first thyristor is connected to one end of the seventeenth resistor. The other end of the seventeenth resistor is grounded. The positive electrode of the first thyristor is connected to one end of the first relay and the positive electrode of the second diode. The other end of the first relay is connected to the negative electrode of the second diode and the operating voltage.

10. The power equipment information detection system according to any one of claims 5 to 8, characterized in that, The fault detection module includes a plurality of fault detection units. Each fault detection unit includes a fourth amplifier, a third diode, and an eighteenth resistor. The non-inverting input terminal of the fourth amplifier is connected to the output terminal of the threshold automatic change module. The inverting input terminal of the fourth amplifier is connected to the reference voltage. The output terminal of the fourth amplifier is connected to the positive electrode of the third diode. The negative electrode of the third diode is connected to one end of the eighteenth resistor. The other end of the eighteenth resistor is grounded. The difference between different fault detection units lies in the different magnitudes of the connected reference voltages.

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