Power equipment fault alarm system

Abstract

The utility model provides a power equipment fault alarm system, and belongs to the technical field of power fault detection. The power equipment fault alarm system comprises a constant current module, a temperature detection module, a first temperature output module, a temperature comparison control module and a second temperature output module. The power supply end of the temperature detection module is connected with the output end of the constant-current module, the output end of the temperature detection module is connected with the input end of the first temperature output module, and the output end of the first temperature output module is used for being connected with the first input end of the control module. The output end of the first temperature output module is connected with the input end of the temperature comparison control module, the output end of the temperature comparison control module is connected with the power supply end of the second temperature output module, and the power supply end of the temperature comparison control module is connected with a power supply; the output end of the second temperature output module is used for being connected with the second input end of the control module. The problem that the overtemperature fault of the cable connector cannot be found in time can be solved.

Description

Technical Field

[0001] This disclosure relates to the field of power fault detection technology, and in particular to a power equipment fault alarm system. Background Technology

[0002] In power systems, the stable operation of electrical equipment is crucial. Cable joints, as critical connection points in power transmission, directly impact the reliability of the entire power system. If the temperature of a cable joint becomes too high and is not detected in time, it can easily lead to power equipment failure, causing widespread power outages and severely disrupting production and daily life. Currently available fault alarm systems also have shortcomings in signal processing and alarm timeliness, failing to immediately report cable joint overheating to operators. Utility Model Content

[0003] This disclosure provides a power equipment fault alarm system to solve the problem of failing to detect cable joint overheating faults in a timely manner.

[0004] This disclosure provides a power equipment fault alarm system, including: a constant current module, a temperature detection module, a first temperature output module, a temperature comparison and control module, and a second temperature output module;

[0005] The constant current module is configured to provide a constant operating current to the temperature detection module. The power supply terminal of the temperature detection module is connected to the output terminal of the constant current module. The output terminal of the temperature detection module is connected to the input terminal of the first temperature output module. The output terminal of the first temperature output module is used to connect to the first input terminal of the control module.

[0006] The output terminal of the first temperature output module is connected to the input terminal of the temperature comparison and control module, the output terminal of the temperature comparison and control module is connected to the power supply terminal of the second temperature output module, and the power supply terminal of the temperature comparison and control module is used to connect to a power source.

[0007] The output terminal of the second temperature output module is used to connect to the second input terminal of the control module;

[0008] The temperature detection module is configured to detect the temperature of the cable joint.

[0009] In one exemplary embodiment of this disclosure, the temperature detection module includes: a thermistor RT, a resistor R5, a resistor R6, a resistor R7, an operational amplifier U1, and a resistor R16;

[0010] The first terminal of the thermistor RT is connected to the output terminal of the constant current module, the second terminal of the thermistor RT is grounded through the resistor R5, the first terminal of the thermistor RT is connected to the inverting input terminal of the operational amplifier U1 through the resistor R6, and the second terminal of the thermistor RT is connected to the non-inverting input terminal of the operational amplifier U1 through the resistor R7.

[0011] The output terminal of the operational amplifier U1 is connected to the inverting input terminal of the operational amplifier U1 through the resistor R16, and the output terminal of the operational amplifier U1 is connected to the input terminal of the first temperature output module.

[0012] In one exemplary embodiment of this disclosure, the first temperature output module includes: resistor R4, resistor R8, operational amplifier U3, and resistor R9;

[0013] The first end of resistor R4 is connected to the output terminal of operational amplifier U1, the second end of resistor R4 is connected to the non-inverting input terminal of operational amplifier U3, the first end of resistor R8 is connected to the reference voltage, the second end of resistor R8 is connected to the inverting input terminal of operational amplifier U3, the output terminal of operational amplifier U3 is connected to the inverting input terminal of operational amplifier U3 through resistor R9, and the output terminal of operational amplifier U3 serves as the output terminal of the first temperature output module.

[0014] In one exemplary embodiment of this disclosure, the temperature comparison control module includes: operational amplifier U5 and transistor Q3;

[0015] The non-inverting input of the operational amplifier U5 is connected to the output of the first temperature output module, the inverting input of the operational amplifier U5 is connected to the Vref reference voltage, the output of the operational amplifier U5 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the VEE power supply, and the emitter of the transistor Q3 is connected to the power supply of the second temperature output module.

[0016] In one exemplary embodiment of this disclosure, the second temperature output module includes: timer U4, resistor R11, resistor R12, capacitor C4, capacitor C5, and resistor R13;

[0017] The power supply terminal of the timer U4 and the first terminal of the resistor R11 are both connected to the emitter of the transistor Q3. The second terminal of the resistor R11 is connected to the first terminal of the resistor R12 and the discharge terminal of the timer U4. The second terminal of the resistor R12 is connected to the first terminal of the capacitor C4, the high trigger terminal of the timer U4, and the low trigger terminal of the timer U4. The second terminal of the capacitor C4 is grounded. The output terminal of the timer U4 is connected to the first terminal of the resistor R13 through the capacitor C5. The second terminal of the resistor R13 is used to connect to the second input terminal of the control module.

[0018] In one exemplary embodiment of this disclosure, the constant current module includes: resistor R1, resistor R2, transistor Q1, transistor Q2, and variable resistor RP1;

[0019] The first ends of resistors R1 and R2 are both connected to power supply VCC. The second end of resistor R1 is connected to the emitter of transistor Q1, and the second end of resistor R2 is connected to the emitter of transistor Q2. The base of transistor Q1 is connected to the base of transistor Q2. The collector of transistor Q1 is grounded through rheostat RP1, and the sliding end of rheostat RP1 is connected to the reference voltage.

[0020] The collector of transistor Q2 serves as the output terminal of the constant current module.

[0021] In one exemplary embodiment of this disclosure, the constant current module further includes: a voltage regulator U2 and a resistor R3;

[0022] The first end of the resistor R3 is connected to the VCC power supply, the second end of the resistor R3 is connected to the cathode of the voltage regulator U2, the anode of the voltage regulator U2 is grounded, the reference terminal of the voltage regulator U2 is connected to the second end of the resistor R3, the cathode of the voltage regulator U2 is connected to the sliding terminal of the rheostat RP1, and the cathode of the voltage regulator U2 is used to generate a reference voltage.

[0023] The beneficial effects of the power equipment fault alarm system provided in this embodiment are as follows: The constant current module in this embodiment provides a constant current to the temperature detection module, ensuring the accuracy and stability of temperature detection and avoiding the impact of current fluctuations on the detection results. The temperature detection module can accurately detect the temperature of the cable joint and convert it into an electrical signal. The first temperature output module amplifies the signal and transmits it to the control module, facilitating the control module to accurately determine the cable joint temperature. The temperature comparison control module can compare the signal with a reference voltage, and promptly connect the power supply to the second temperature output module when the temperature is abnormal. The second temperature output module outputs a pulse alarm signal, enabling the control module to quickly transmit the alarm information to the terminal, promptly detect cable joint over-temperature faults, effectively prevent power equipment failures, and ensure the safe and stable operation of the power system. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1This is a schematic diagram of the structure of the power equipment fault alarm system provided in the embodiments of this disclosure;

[0026] Figure 2 This is a circuit diagram of a power equipment fault alarm system provided in an embodiment of this disclosure. Detailed Implementation

[0027] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0028] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0029] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:

[0030] Figure 1 This is a schematic diagram of a power equipment fault alarm system provided in an embodiment of this disclosure. (Refer to...) Figure 1 The power equipment fault alarm system includes: a constant current module, a temperature detection module, a first temperature output module, a temperature comparison and control module, and a second temperature output module.

[0031] The constant current module is configured to provide a constant operating current to the temperature detection module. The power supply terminal of the temperature detection module is connected to the output terminal of the constant current module. The output terminal of the temperature detection module is connected to the input terminal of the first temperature output module. The output terminal of the first temperature output module is used to connect to the first input terminal of the control module.

[0032] The output terminal of the first temperature output module is connected to the input terminal of the temperature comparison and control module, the output terminal of the temperature comparison and control module is connected to the power supply terminal of the second temperature output module, and the power supply terminal of the temperature comparison and control module is used to connect to the power supply.

[0033] The output terminal of the second temperature output module is used to connect to the second input terminal of the control module;

[0034] The temperature detection module is configured to detect the temperature of the cable joint.

[0035] In this embodiment, the constant current module provides a stable and constant operating current to the temperature detection module. This ensures that the temperature detection module can operate under stable power conditions, avoiding the impact of current fluctuations on the accuracy of temperature detection.

[0036] The temperature detection module can use infrared detection or fiber optic temperature detection circuits to monitor the temperature of the cable joint in real time and convert the detected temperature signal into an electrical signal for output.

[0037] The first temperature output module receives the electrical signal from the temperature detection module and amplifies it. The amplified electrical signal is then sent to the control module, which can be a microcontroller. The microcontroller communicates with the terminal wirelessly to determine the temperature of the cable joint based on the voltage signal output by the first temperature output module.

[0038] The temperature comparison control module compares the voltage signal output by the first temperature output module with a reference voltage. When the voltage signal exceeds the preset voltage, it indicates that the cable connector temperature is too high. At this time, the temperature comparison control module can connect the second temperature output module to the power supply.

[0039] The second temperature output module can be composed of a pulse generator. After being powered on, the second temperature output module can output a pulse signal. This pulse signal is sent to the control module as an alarm signal for the cable joint temperature. The control module transmits the alarm signal to the terminal via wireless communication. When the terminal receives the pulse signal, it indicates that the cable joint temperature has exceeded the preset temperature, thus realizing the alarm function for power equipment faults.

[0040] As can be seen from the above, the constant current module in this embodiment provides a constant current to the temperature detection module, ensuring the accuracy and stability of temperature detection and avoiding the impact of current fluctuations on the detection results. The temperature detection module can accurately detect the temperature of the cable joint and convert it into an electrical signal. The first temperature output module amplifies the signal and transmits it to the control module, facilitating the control module's accurate judgment of the cable joint temperature. The temperature comparison control module can compare the signal with a reference voltage, and promptly connect the power supply to the second temperature output module when the temperature is abnormal. The second temperature output module outputs a pulse alarm signal, enabling the control module to quickly transmit alarm information to the terminal, promptly detect cable joint over-temperature faults, effectively prevent power equipment failures, and ensure the safe and stable operation of the power system.

[0041] like Figure 2 As shown, in one embodiment of this disclosure, the temperature detection module includes: a thermistor RT, resistors R5, R6, R7, operational amplifier U1, and resistor R16;

[0042] The first terminal of the thermistor RT is connected to the output terminal of the constant current module, the second terminal of the thermistor RT is grounded through resistor R5, the first terminal of the thermistor RT is connected to the inverting input terminal of operational amplifier U1 through resistor R6, and the second terminal of the thermistor RT is connected to the non-inverting input terminal of operational amplifier U1 through resistor R7.

[0043] The output terminal of operational amplifier U1 is connected to the inverting input terminal of operational amplifier U1 through resistor R16, and the output terminal of operational amplifier U1 is connected to the input terminal of the first temperature output module.

[0044] In this embodiment, the thermistor RT can be installed at the cable connector position, and the constant current module provides a constant operating current to the temperature detection module, which flows through the thermistor RT.

[0045] A thermistor RT changes its resistance in response to variations in the temperature of the cable joint. When the cable joint temperature rises, the resistance of the thermistor RT changes accordingly. Under a constant current, the voltage across the thermistor RT also changes, reflecting the temperature of the cable joint.

[0046] Resistors R6 and R7, operational amplifier U1, and resistor R16 constitute a differential amplifier circuit. The voltage across the thermistor RT is connected to the inverting and non-inverting inputs of operational amplifier U1 via resistors R6 and R7, respectively. Operational amplifier U1 amplifies the voltage difference between the inverting and non-inverting inputs. Resistor R16 is connected between the output and inverting input of operational amplifier U1, forming negative feedback, which stabilizes the amplification factor and ensures the accuracy and stability of the output signal. The amplified signal is output from the output of operational amplifier U1, and this output signal is connected to the input of the first temperature output module.

[0047] like Figure 2 As shown, in one embodiment of this disclosure, the first temperature output module includes: resistor R4, resistor R8, operational amplifier U3, and resistor R9;

[0048] The first end of resistor R4 is connected to the output terminal of operational amplifier U1, and the second end of resistor R4 is connected to the non-inverting input terminal of operational amplifier U3. The first end of resistor R8 is connected to the reference voltage, and the second end of resistor R8 is connected to the inverting input terminal of operational amplifier U3. The output terminal of operational amplifier U3 is connected to the inverting input terminal of operational amplifier U3 through resistor R9. The output terminal of operational amplifier U3 serves as the output terminal of the first temperature output module.

[0049] In this embodiment, resistors R4 and R8, operational amplifier U3, and resistor R9 constitute the second differential amplifier circuit. Two-stage amplification improves detection accuracy. The output of operational amplifier U3 serves as the output of the first temperature output module. The signal, further amplified and processed by the second differential amplifier circuit, is output from the output of operational amplifier U3. This signal is sent to the first input of the control module, allowing the control module to determine the temperature of the cable joint based on this precisely amplified signal.

[0050] like Figure 2 As shown, in one embodiment of this disclosure, the temperature comparison control module includes: operational amplifier U5 and transistor Q3;

[0051] The non-inverting input of op-amp U5 is connected to the output of the first temperature output module, the inverting input of op-amp U5 is connected to the Vref reference voltage, the output of op-amp U5 is connected to the base of transistor Q3, the collector of transistor Q3 is connected to the VEE power supply, and the emitter of transistor Q3 is connected to the power supply of the second temperature output module.

[0052] In this embodiment, operational amplifier U5 forms a comparator. The amplified voltage signal output by the first temperature output module, which reflects the temperature of the cable joint, is connected to the non-inverting input of operational amplifier U5. Simultaneously, a reference voltage Vref is connected to the inverting input of operational amplifier U5. This reference voltage is a pre-set fixed value representing the voltage threshold corresponding to the normal operating temperature of the cable joint.

[0053] When the voltage at the non-inverting input is less than the voltage at the inverting input (i.e., the cable joint temperature is normal), op-amp U5 outputs a low-level signal. When the voltage at the non-inverting input is greater than the voltage at the inverting input (i.e., the cable joint temperature exceeds a preset value), op-amp U5 outputs a high-level signal.

[0054] Transistor Q3 operates in switching mode. When the temperature is normal, op-amp U5 outputs a low level, and transistor Q3 is cut off, equivalent to the switch being open. The second temperature output module cannot obtain power from the VEE power supply, therefore it does not work and will not output an alarm signal.

[0055] When the temperature is abnormal, operational amplifier U5 outputs a high level, and transistor Q3 conducts, which is equivalent to closing a switch. The VEE power supply powers the second temperature output module through the conducting transistor Q3, and the second temperature output module starts working, outputting a pulse signal as an alarm signal for the cable joint temperature.

[0056] As can be seen from the above, the temperature comparison control module compares the voltage signal through operational amplifier U5 and uses transistor Q3 as a switch to control the power supply of the second temperature output module, thus realizing the function of triggering an alarm signal based on whether the cable joint temperature exceeds the preset value.

[0057] like Figure 2 As shown, in one embodiment of this disclosure, the second temperature output module includes: timer U4, resistor R11, resistor R12, capacitor C4, capacitor C5 and resistor R13;

[0058] The power supply terminal of timer U4 and the first terminal of resistor R11 are both connected to the emitter of transistor Q3. The second terminal of resistor R11 is connected to the first terminal of resistor R12 and the discharge terminal of timer U4. The second terminal of resistor R12 is connected to the first terminal of capacitor C4, the high trigger terminal of timer U4, and the low trigger terminal of timer U4. The second terminal of capacitor C4 is grounded. The output terminal of timer U4 is connected to the first terminal of resistor R13 through capacitor C5. The second terminal of resistor R13 is used to connect to the second input terminal of the control module.

[0059] In this embodiment, a 555 timer can be used as timer U4. Timer U4, resistors R11 and R12, capacitors C4 and C5, and resistor R13 constitute a pulse generation circuit.

[0060] When the cable connector temperature is normal, transistor Q3 in the temperature comparison control module is in the off state, and the second temperature output module has no power supply and does not work. When the cable connector temperature exceeds the preset value, transistor Q3 conducts, and the VEE power supply powers the timer U4 through transistor Q3. At the same time, current flows through resistor R11, and the entire pulse generation circuit starts to work.

[0061] After power is supplied, the output of timer U4 continuously switches between high and low levels, generating a pulse signal. This pulse signal is DC-blocked by capacitor C5 to remove the DC component, and then transmitted to the second input of the control module through resistor R13. Upon receiving this pulse signal, the control module can determine that the cable joint temperature exceeds the preset temperature and take appropriate alarm measures.

[0062] like Figure 2 As shown, in one embodiment of this disclosure, the constant current module includes: resistor R1, resistor R2, transistor Q1, transistor Q2, and variable resistor RP1;

[0063] The first end of resistor R1 and the first end of resistor R2 are both connected to the power supply VCC. The second end of resistor R1 is connected to the emitter of transistor Q1, the second end of resistor R2 is connected to the emitter of transistor Q2, the base of transistor Q1 is connected to the base of transistor Q2, and the collector of transistor Q1 is grounded through rheostat RP1. The sliding end of rheostat RP1 is connected to the reference voltage.

[0064] The collector of transistor Q2 serves as the output terminal of the constant current module.

[0065] In this embodiment, when factors such as load changes or power supply voltage fluctuations attempt to alter the collector current of Q2, the circuit generates negative feedback regulation. For example, if the output current tends to increase, the emitter potential of Q2 will rise. Since the base potentials of Q1 and Q2 are connected, the emitter potential of Q1 will also rise, leading to an increase in the collector current of Q1. This increases the current through RP1, increasing the voltage drop across RP1, thereby lowering the base potentials of Q1 and Q2 and suppressing the increase in the collector current of Q2. Conversely, if the output current tends to decrease, the circuit will perform reverse regulation to maintain a relatively stable output current and achieve constant current output.

[0066] The reference voltage connected to the sliding terminal of the rheostat RP1 provides a benchmark for current regulation. This ensures that the circuit can accurately stabilize the output current near the set value under different regulation conditions.

[0067] like Figure 2 As shown, in one embodiment of this disclosure, the constant current module further includes: a voltage regulator U2 and a resistor R3;

[0068] The first end of resistor R3 is connected to the VCC power supply, the second end of resistor R3 is connected to the cathode of voltage regulator U2, the anode of voltage regulator U2 is grounded, the reference terminal of voltage regulator U2 is connected to the second end of resistor R3, the cathode of voltage regulator U2 is connected to the sliding terminal of rheostat RP1, and the cathode of voltage regulator U2 is used to generate a reference voltage.

[0069] In this embodiment, the voltage regulator U2 can automatically adjust the cathode current so that its cathode voltage is stabilized at a fixed value, which is the required reference voltage.

[0070] The anode of voltage regulator U2 is grounded, and the reference electrode is connected to its cathode. When the cathode voltage is higher than the internally set reference voltage, the internal circuit of voltage regulator U2 will increase the cathode current, which will increase the voltage drop across resistor R3 and decrease the cathode voltage; conversely, when the cathode voltage is lower than the internally set reference voltage, the cathode current will decrease, the voltage drop across resistor R3 will decrease, and the cathode voltage will increase.

[0071] A stable reference voltage ensures that the constant current module can accurately stabilize the output current near the set value under different operating conditions (such as power supply voltage fluctuations, ambient temperature changes, etc.), thus improving the performance and reliability of the constant current module.

[0072] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. An electric power equipment failure alarm system, characterized by, The application relates to a temperature detection and control system for a cable joint, which comprises a constant current module, a temperature detection module, a first temperature output module, a temperature comparison control module and a second temperature output module. The constant current module is configured to provide a constant working current for the temperature detection module, a power supply end of the temperature detection module is connected to an output end of the constant current module, an output end of the temperature detection module is connected to an input end of the first temperature output module, and an output end of the first temperature output module is used for connecting a first input end of a control module. An output end of the first temperature output module is connected to an input end of the temperature comparison control module, an output end of the temperature comparison control module is connected to a power supply end of the second temperature output module, and a power supply end of the temperature comparison control module is used for connecting a power supply. An output end of the second temperature output module is used for connecting a second input end of the control module. The temperature detection module is configured to detect a cable joint temperature. The temperature detection module comprises a thermistor RT, resistors R5, R6, R7, an operational amplifier U1 and a resistor R16.

2. The power equipment failure warning system of claim 1, wherein, A first end of the thermistor RT is connected to an output end of the constant current module, a second end of the thermistor RT is grounded through the resistor R5, the first end of the thermistor RT is connected to an inverting input end of the operational amplifier U1 through the resistor R6, and a second end of the thermistor RT is connected to a non-inverting input end of the operational amplifier U1 through the resistor R7. An output end of the operational amplifier U1 is connected to the non-inverting input end of the operational amplifier U1 through the resistor R16, and the output end of the operational amplifier U1 is connected to an input end of the first temperature output module. The first temperature output module comprises resistors R4, R8, an operational amplifier U3 and a resistor R9.

3. The power equipment fault warning system of claim 2, wherein, A first end of the resistor R4 is connected to an output end of the operational amplifier U1, a second end of the resistor R4 is connected to a non-inverting input end of the operational amplifier U3, a first end of the resistor R8 is connected to a reference voltage, a second end of the resistor R8 is connected to an inverting input end of the operational amplifier U3, an output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R9, and the output end of the operational amplifier U3 serves as an output end of the first temperature output module. The temperature comparison control module comprises an operational amplifier U5 and a triode Q3.

4. The power equipment failure warning system of claim 1, wherein, A non-inverting input end of the operational amplifier U5 is connected to an output end of the first temperature output module, an inverting input end of the operational amplifier U5 is connected to a Vref reference voltage, an output end of the operational amplifier U5 is connected to a base of the triode Q3, a collector of the triode Q3 is connected to a VEE power supply, and an emitter of the triode Q3 is connected to a power supply end of the second temperature output module. The second temperature output module comprises a timer U4, resistors R11, R12, capacitors C4, C5 and a resistor R13.

5. The power equipment fault warning system of claim 4, wherein, ​ The power supply end of the timer U4 and the first end of the resistor R11 are connected with the emitter of the triode Q3, the second end of the resistor R11 is connected with the first end of the resistor R12 and the discharge end of the timer U4 respectively, the second end of the resistor R12 is connected with the first end of the capacitor C4, the high trigger end of the timer U4 and the low trigger end of the timer U4 respectively, the second end of the capacitor C4 is grounded, the output end of the timer U4 is connected with the first end of the resistor R13 through the capacitor C5, and the second end of the resistor R13 is used for connecting the second input end of the control module.

6. The power equipment failure warning system of claim 1, wherein, The constant current module comprises a resistor R1, a resistor R2, a triode Q1, a triode Q2 and a variable resistor RP1. The first end of the resistor R1 and the first end of the resistor R2 are connected with the power supply VCC, the second end of the resistor R1 is connected with the emitter of the triode Q1, the second end of the resistor R2 is connected with the emitter of the triode Q2, the base of the triode Q1 is connected with the base of the triode Q2, the collector of the triode Q1 is grounded through the variable resistor RP1, and the sliding end of the variable resistor RP1 is connected with a reference voltage. The collector of the triode Q2 serves as the output end of the constant current module.

7. The power equipment fault warning system of claim 6, wherein, The constant current module further comprises a voltage stabilizer U2 and a resistor R3. The first end of the resistor R3 is connected with the VCC power supply, the second end of the resistor R3 is connected with the cathode of the voltage stabilizer U2, the anode of the voltage stabilizer U2 is grounded, the reference pole of the voltage stabilizer U2 is connected with the second end of the resistor R3, the cathode of the voltage stabilizer U2 is connected with the sliding end of the variable resistor RP1, and the cathode of the voltage stabilizer U2 is used for generating a reference voltage.

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