CN211505803U - Low-voltage load fault detection device - Google Patents
Low-voltage load fault detection device Download PDFInfo
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- CN211505803U CN211505803U CN201922373109.0U CN201922373109U CN211505803U CN 211505803 U CN211505803 U CN 211505803U CN 201922373109 U CN201922373109 U CN 201922373109U CN 211505803 U CN211505803 U CN 211505803U
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Abstract
The utility model provides a low pressure load fault detection device belongs to the electrical equipment field to a low pressure load fault detection device that can detect and report to the police to the trouble type of load after low voltage circuit breaker separating brake is provided. Through setting up voltage acquisition and power module, load electric leakage fault detection module and control module, a device that can detect the fault type of load and report to the police after low-voltage circuit breaker tripping operation is provided, can accurately judge the short-circuit fault or the electric leakage fault of load through the device, and send alarm signal notice maintenance, therefore can reduce because the problem that the load can bring danger for load and operating personnel is given to the low-voltage circuit breaker of coincidence when load end short-circuit fault or electric leakage fault still exist, have important meaning to avoiding secondary failure.
Description
Technical Field
The utility model relates to an electrical equipment technical field especially relates to a low pressure load fault detection device.
Background
Statistically, 80% of the faults causing tripping of the low-voltage circuit breaker are accidental, and the permanent fault accounts for no more than 10%. In particular, a leakage current breaker causes malfunction due to many factors, such as a surge voltage caused by disconnection of a large power load or lightning, harmonics caused by power electronic equipment, and a capacitive leakage current from a long conductor to the ground.
Under the condition that the low-voltage circuit breaker is opened, if faults such as short circuit and residual current of a load circuit can be detected and the faults can be found and alarm in time, the problem that the danger is brought to loads and operators due to the fact that the low-voltage circuit breaker is overlapped when the short circuit fault or the open circuit fault of the load end still exists is greatly reduced, and the method has important significance for avoiding secondary faults and the like.
Therefore, it is necessary to provide a device capable of detecting and alarming the fault type of the load after the low-voltage circuit breaker is opened.
Disclosure of Invention
The utility model aims at providing a can detect the low pressure load fault detection device who reports to the police to the trouble type of load after low voltage circuit breaker separating brake.
In order to solve the technical problem, the utility model discloses a technical scheme is:
the utility model provides a low pressure load fault detection device, its includes voltage acquisition and power module, load electric leakage fault detection module, load short circuit fault detection module and control module, wherein:
the voltage acquisition and power supply module comprises a plug J1, a thermistor R1, a piezoresistor VDR1, a capacitor C6, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a capacitor C2, a diode D1, an electrolytic capacitor C4, a capacitor C3, a 24V power chip U1, a diode D4, a resistor R5, an electrolytic capacitor C11, a resistor R7, an electrolytic capacitor C12, a capacitor C7, a capacitor C5, an electrolytic capacitor C1, a diode D6, a zener diode D2, a diode D6372, an inductor L3, a zener diode D3, an electrolytic capacitor C3, a capacitor C8472 and a capacitor C3, wherein the plug J3 is used for being plugged in an alternating current power supply, a pin 2 of the plug J3 is connected with a live wire, a pin 1 of the plug J3 is connected with a zero wire, one end of the thermistor R3 is connected with a pin 2 of the plug J3, the other end of the plug J3 is connected with the VDR 3, and the other end of the plug is connected with the VDR 3, and the pin of the other end of, a capacitor C6 is connected in parallel with a voltage dependent resistor VDR1, one end of a resistor R2 is connected with the other end of the thermistor R1 and is connected with an external +5V power supply, the other end of a resistor R2 is connected with one end of a resistor R3, the other end of a resistor R3 is connected with one end of a resistor R4, the other end of a resistor R4 is connected with one end of a resistor R6, the other end of the resistor R6 is grounded, one end of a capacitor C6 is connected with one end of the resistor R6, the other end of the capacitor C6 is grounded, the anode of a diode D6 is connected with one end of the capacitor C6, the cathode of the diode D6 is connected with the anode of the electrolytic capacitor C6, the cathode of the electrolytic capacitor C6 is grounded, the capacitor C6 is connected in parallel with the electrolytic capacitor C6, the anode of the diode D6 is connected with the other end of the resistor R6, the cathode of the diode D6 is connected with the cathode of the electrolytic capacitor C6 in parallel with the diode D6, the cathode of the electrolytic capacitor C, the other end of the resistor R5 is connected with the anode of an electrolytic capacitor C12, the cathode of the electrolytic capacitor C12 is grounded, the pin 5, the pin 6, the pin 7 and the pin 8 of a 24V power supply chip U1 are all connected with the cathode of a diode D1, the pin 1 and the pin 2 of the 24V power supply chip U1 are all connected with one end of a capacitor C7, the other end of the capacitor C7 is grounded, the pin 3 of the 24V power supply chip U1 is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with one end of a capacitor C7, the pin 4 of the 24V power supply chip U1 is connected with the anode of an electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is connected with the cathode of a diode D6, the anode of a diode D6 is grounded, the cathode of a voltage stabilizing diode D2 is connected with the anode of an electrolytic capacitor C1, the anode of a stabilizing diode D2 is connected with the pin 3 of the 24V power supply chip U1, one end of an inductor L1 is connected with the anode of one end of the capacitor C, the anode of the diode D3 is connected with the cathode of the voltage stabilizing diode D5, the anode of the voltage stabilizing diode D5 is grounded, the other end of the inductor L1 is connected with the anode of the diode D3, and the electrolytic capacitor C8, the capacitor C9 and the capacitor C10 are all connected with the voltage stabilizing diode D5 in parallel;
the load leakage fault detection module comprises a resistor R8, a zener diode D8, a resistor R8, a capacitor C8, a zener diode D8, a diode D8, an electrolytic capacitor C8, a resistor R8, an electrolytic capacitor C8, a relay K8, a diode D8 and a patch transistor TR 8, wherein one end of the resistor R8 is connected with an external +5V power supply, the other end of the resistor R8 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the negative electrode of the zener diode D8, the positive electrode of the zener diode D8 is connected with the positive electrode of the zener diode D8, the negative electrode of the zener diode D8 is grounded, one end of the resistor R8 is connected with the other end of the resistor R8, the other end of the capacitor C8 is connected with the negative electrode of the zener diode D8, and the other end of the capacitor C8 is connected with the negative electrode of the zener diode D8. The anode of a voltage-stabilizing diode D10 is grounded, the anode of a diode D9 is connected with the other end of a capacitor C13, the cathode of a diode D9 is connected with the anode of an electrolytic capacitor C14, the cathode of an electrolytic capacitor C14 is grounded, a resistor R13 is connected with an electrolytic capacitor C14 in parallel, one end of a resistor R11 is connected with the cathode of a diode D9, the other end of a resistor R11 is connected with the anode of an electrolytic capacitor C15, the cathode of an electrolytic capacitor C15 is grounded, one end of a normally open contact of a relay K1 is connected with a wire outlet end of a low-voltage circuit breaker, the other end of the normally open contact of a relay K1 is connected with the other end of a resistor R9, one end of a coil of a relay K1V power chip U1, the other end of a coil of a relay K1 is connected with a pin 3 of a patch triode TR1, the cathode of a diode D7 is connected with one end of a coil of a relay K1, the, pin 2 of the patch transistor TR1 is grounded;
the load short-circuit fault detection module comprises a resistor R15, a relay K2, a diode D15, a patch triode TR2, a resistor R14, a capacitor C16, a capacitor C17, a diode D12, an electrolytic capacitor C18, a diode D13, a diode D14, a diode D16, a resistor R17 and an electrolytic capacitor C17, wherein one end of a coil of the relay K17 is connected with a pin 1 of a 24V power supply chip U17, the other end of the coil of the relay K17 is connected with a pin 3 of the patch triode TR 17, a pin 2 of the patch triode TR 17 is grounded, the cathode of the diode D17 is connected with one end of the coil of the relay K17, the anode of the diode D17 is connected with a pin 3 of the patch triode TR 17, a contact of the relay K17 is used for switching between a power supply incoming line of a load and two ends of the resistor R17, one end of the resistor R17 is connected with an external +5V power supply, the other end of the diode R, the anode of the diode D12 is further connected with the fixed end of the contact of the relay K2, the capacitor C16 and the capacitor C17 are both connected in parallel with the resistor R14, the cathode of the diode D12 is connected with the anode of the electrolytic capacitor C18, the cathode of the electrolytic capacitor C18 is grounded, the diode D13, the diode D14 and the diode D16 are connected in series and then connected in parallel with the electrolytic capacitor C18, the resistor R17 is connected in parallel with the electrolytic capacitor C18, one end of the resistor R16 is connected with the cathode of the diode D12, the other end of the resistor R16 is connected with the anode of the electrolytic capacitor C19, and the cathode of the electrolytic capacitor C19 is grounded;
the control module comprises a capacitor C21, a capacitor C22, a resistor R18, a control chip U2 and a capacitor C20, a pin 13 of the control chip U2 is connected with a pin 1 of a patch triode TR1, a pin 14 of the control chip U2 is connected with a pin 1 of a patch triode TR2, a pin 4 and a pin 6 of the control chip U2 and one end of a capacitor C21 are both connected with an external +5V power supply, the other end of the capacitor C21 is grounded, a pin 3 and a pin 5 of the control chip U2 are both grounded, a pin 18 and a pin 20 of the control chip U2 and one end of the capacitor C22 are both connected with an external +5V power supply, the other end of the capacitor C22 and a pin 21 of the control chip U2 are both grounded, a pin 19 of the control chip U2 is connected with the anode of an electrolytic capacitor C15, a pin 22 of the control chip U2 is connected with the anode of an electrolytic capacitor C19, a pin 27 of the control chip U56 is connected with the anode of a capacitor C12, and one end of the resistor R865 are, the other end of the resistor R18 is connected with one end of the capacitor C20, the other end of the capacitor C20 is grounded, the pin 29 of the control chip U2 is connected with the other end of the resistor R18, and the pin 2, the pin 9, the pin 10 and the pin 11 of the control chip U2 are respectively connected with an alarm lamp.
The utility model has the advantages that:
through setting up voltage acquisition and power module, load electric leakage fault detection module and control module, a device that can detect the fault type of load and report to the police after low-voltage circuit breaker tripping operation is provided, can accurately judge the short-circuit fault or the electric leakage fault of load through the device, and send alarm signal notice maintenance, therefore can reduce because the problem that the load can bring danger for load and operating personnel is given to the low-voltage circuit breaker of coincidence when load end short-circuit fault or electric leakage fault still exist, have important meaning to avoiding secondary failure.
Drawings
Fig. 1 is a schematic diagram of the structure of the medium voltage acquisition and power supply module of the present invention.
Fig. 2 is a schematic diagram of the structure of the middle load leakage fault detection module of the present invention.
Fig. 3 is a schematic diagram of the structure of the middle load short-circuit fault detection module of the present invention.
Fig. 4 is a schematic diagram of the structure of the control module according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The low-voltage load fault detection device in the embodiment comprises a voltage acquisition and power supply module, a load leakage fault detection module and a control module.
As shown in fig. 1, the voltage collecting and power supply module includes a plug J1, a thermistor R1, a voltage dependent resistor VDR1, a capacitor C6, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a capacitor C2, a diode D1, an electrolytic capacitor C4, a capacitor C3, a 24V power chip U1, a diode D4, a resistor R5, an electrolytic capacitor C11, a resistor R7, an electrolytic capacitor C12, a capacitor C7, a capacitor C5, an electrolytic capacitor C1, a diode D6, a zener diode D2, a diode D3, an inductor L3, a zener diode D3, an electrolytic capacitor C3, a capacitor C3 and a capacitor C3, the plug J3 is used for being plugged into an ac power supply, a pin 2 of the plug J3 is connected with a live wire, a pin 1 of the plug J3 is connected with a null line, one end of the thermistor J3 is connected with a pin 2 of the plug J3, and the other end of the resistor R3 is connected with a pin of the VDR 3, and the other end of the plug 3 is connected with a pin of the plug 3, a capacitor C6 is connected in parallel with a voltage dependent resistor VDR1, one end of a resistor R2 is connected with the other end of the thermistor R1 and is connected with an external +5V power supply, the other end of a resistor R2 is connected with one end of a resistor R3, the other end of a resistor R3 is connected with one end of a resistor R4, the other end of a resistor R4 is connected with one end of a resistor R6, the other end of the resistor R6 is grounded, one end of a capacitor C6 is connected with one end of the resistor R6, the other end of the capacitor C6 is grounded, the anode of a diode D6 is connected with one end of the capacitor C6, the cathode of the diode D6 is connected with the anode of the electrolytic capacitor C6, the cathode of the electrolytic capacitor C6 is grounded, the capacitor C6 is connected in parallel with the electrolytic capacitor C6, the anode of the diode D6 is connected with the other end of the resistor R6, the cathode of the diode D6 is connected with the cathode of the electrolytic capacitor C6 in parallel with the diode D6, the cathode of the electrolytic capacitor C, the other end of the resistor R5 is connected with the anode of an electrolytic capacitor C12, the cathode of the electrolytic capacitor C12 is grounded, the pin 5, the pin 6, the pin 7 and the pin 8 of a 24V power supply chip U1 are all connected with the cathode of a diode D1, the pin 1 and the pin 2 of the 24V power supply chip U1 are all connected with one end of a capacitor C7, the other end of the capacitor C7 is grounded, the pin 3 of the 24V power supply chip U1 is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with one end of a capacitor C7, the pin 4 of the 24V power supply chip U1 is connected with the anode of an electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is connected with the cathode of a diode D6, the anode of a diode D6 is grounded, the cathode of a voltage stabilizing diode D2 is connected with the anode of an electrolytic capacitor C1, the anode of a stabilizing diode D2 is connected with the pin 3 of the 24V power supply chip U1, one end of an inductor L1 is connected with the anode of one end of the capacitor C, the anode of the diode D3 is connected with the cathode of the voltage stabilizing diode D5, the anode of the voltage stabilizing diode D5 is grounded, the other end of the inductor L1 is connected with the anode of the diode D3, and the electrolytic capacitor C8, the capacitor C9 and the capacitor C10 are all connected with the voltage stabilizing diode D5 in parallel.
In order to meet the requirement of load fault detection work, the voltage acquisition and power supply module provides +24V output voltage through a 24V power supply chip U1(VIPer12A PWM power switch chip), and is externally connected with a +5V direct current power supply (VCC). A thermistor R1 and a piezoresistor VDR1 are added to a 220V alternating current power supply end for current limiting and overheating protection, so that a circuit is protected when instantaneous abrupt voltage is generated, and meanwhile, high-frequency noise can be filtered by the parallel capacitor C6, and voltage resistance is improved. The VIPer12A PWM power switch chip has protection functions of overcurrent, high temperature, overvoltage/undervoltage and the like, and the stability of the circuit is further improved.
As shown in fig. 2, the load leakage fault detection module includes a resistor R8, a resistor R9, a zener diode D8, a zener diode D11, a resistor R10, a resistor R12, a capacitor C13, a zener diode D13, a diode D13, an electrolytic capacitor C13, a resistor R13, an electrolytic capacitor C13, a relay K13, a diode D13, and a patch transistor TR 13, wherein one end of the resistor R13 is connected to an external +5V power supply (VCC), the other end of the resistor R13 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to a cathode of the zener diode D13, an anode of the zener diode D13 is connected to an anode of the zener diode D13, a cathode of the zener diode D13 is connected to ground, one end of the resistor R13 is connected to the other end of the resistor R13, the other end of the resistor R13 is connected to ground, and one end of the capacitor C13 is connected to the resistor R13, the other end of the capacitor C13 is connected with the negative electrode of a voltage stabilizing diode D10, the positive electrode of a voltage stabilizing diode D10 is grounded, the positive electrode of a diode D9 is connected with the other end of a capacitor C13, the negative electrode of a diode D9 is connected with the positive electrode of an electrolytic capacitor C14, the negative electrode of an electrolytic capacitor C14 is grounded, a resistor R13 is connected with an electrolytic capacitor C14 in parallel, one end of a resistor R11 is connected with the negative electrode of a diode D9, the other end of a resistor R11 is connected with the positive electrode of an electrolytic capacitor C15, the negative electrode of an electrolytic capacitor C15 is grounded, one end of a normally open contact of a relay K1 is connected with a lead terminal (load terminal) of a low-voltage circuit breaker, the other end of the normally open contact of a relay K1 is connected with the other end of a resistor R9, one end of a coil of a relay K1 is connected with a pin 1 of a 24V power chip U1, the other end of a coil of a, the anode of the diode D7 is connected to pin 3 of the chip transistor TR1, and pin 2 of the chip transistor TR1 is grounded.
The zener diode D8 and the zener diode D11 are used for voltage stabilization to prevent the influence caused by voltage fluctuation, and thus, function as a protection circuit.
As shown in fig. 3, the load short-circuit fault detection module includes a resistor R15, a relay K2, a diode D15, a patch transistor TR2, a resistor R14, a capacitor C16, a capacitor C17, a diode D12, an electrolytic capacitor C18, a diode D13, a diode D14, a diode D16, a resistor R17, and an electrolytic capacitor C17, wherein one end of a coil of the relay K17 is connected to a pin 1 of a 24V power chip U17, the other end of the coil of the relay K17 is connected to a pin 3 of the patch transistor TR 17, a pin 2 of the patch transistor TR 17 is grounded, a cathode of the diode D17 is connected to one end of the coil of the relay K17, an anode of the diode D17 is connected to a pin 3 of the patch transistor TR 17, a contact of the relay K17 is used for switching between a power supply line of a load and two ends of the resistor R17, one end of the resistor R17 is connected to an external +5V power supply, and the other end of the, the anode of the diode D12 is further connected with the fixed end of the contact of the relay K2, the capacitor C16 and the capacitor C17 are both connected in parallel with the resistor R14, the cathode of the diode D12 is connected with the anode of the electrolytic capacitor C18, the cathode of the electrolytic capacitor C18 is grounded, the diode D13, the diode D14 and the diode D16 are connected in series and then connected in parallel with the electrolytic capacitor C18, the resistor R17 is connected in parallel with the electrolytic capacitor C18, one end of the resistor R16 is connected with the cathode of the diode D12, the other end of the resistor R16 is connected with the anode of the electrolytic capacitor C19, and the cathode of the electrolytic capacitor C19 is grounded.
The capacitor C16 and the capacitor C17 are connected in parallel to VCC to stabilize the circuit voltage, and the diode D12, the diode D13, the diode D14 and the diode D16 prevent reverse current and stabilize the voltage.
As shown in fig. 4, the control module includes a capacitor C21, a capacitor C22, a resistor R18, a control chip U2(ATmega48) and a capacitor C20, a pin 13 of the control chip U2 is connected to a pin 1 of a chip transistor TR1, a pin 14 of the control chip U2 is connected to a pin 1 of a chip transistor TR2, a pin 4 and a pin 6 of a control chip U2 and one end of a capacitor C21 are both connected to an external +5V power supply, the other end of the capacitor C21 is grounded, a pin 3 and a pin 5 of the control chip U2 are both grounded, a pin 18 and a pin 20 of the control chip U2 and one end of the capacitor C22 are both connected to an external +5V power supply, the other end of the capacitor C22 and a pin 21 of the control chip U2 are both grounded, a pin 19 of the control chip U2 is connected to a positive electrode of an electrolytic capacitor C15, a pin 22 of the control chip U2 is connected to a positive electrode of an electrolytic capacitor C19, and a pin 8653 of the control chip U6327 are, one end of a resistor R18 is connected with an external +5V power supply, the other end of a resistor R18 is connected with one end of a capacitor C20, the other end of the capacitor C20 is grounded, a pin 29 of a control chip U2 is connected with the other end of a resistor R18, and a pin 2, a pin 9, a pin 10 and a pin 11 of a control chip U2 are respectively connected with an alarm lamp. Specific circuit composition of a clock circuit and the like connected to the control chip U2 can be referred to as a circuit in the related art.
The functions realized by the control chip U2 mainly include main contact state detection, short-circuit fault detection, leakage fault detection, alarm and the like. The ATmega48 singlechip has an 8-channel 10-bit ADC, the voltage acquisition is similar to that of the ATmega128 singlechip, 1024 times of sampling are carried out on the voltage in one period by setting interruption, the voltage value is calculated by adopting a root-mean-square calculation mode to obtain an effective value of the voltage, and a calculation formula of the root-mean-square is shown in formula (1).
In equation (1): u is a sampling voltage effective value; x is a sampling value; n is the number of sampling points.
Faults that cause tripping of a low-voltage circuit breaker typically include leakage (open circuit) faults and short-circuit faults. The detection principle of the leakage fault is mainly to obtain the grounding resistance between the L line or the N line and the PE line through measurement, and whether the leakage fault exists in the line can be indirectly known through the resistance value of the grounding resistance. The cause of the short-circuit fault is simple, and the communication is usually caused by conductor connection or insufficient creepage distance, electric clearance and the like between different phases. The detection of the short-circuit fault is to detect the loop resistance of the system, and whether the short-circuit fault exists in the line can be indirectly obtained through the resistance value of the loop resistance.
The utility model discloses when using, insert plug J1 earlier on 220V alternating current power supply, with relay K1 normally open contact's termination in low voltage circuit breaker's inlet wire end. When detecting whether low-voltage circuit breaker is leakage fault, control chip U2 control relay K1's coil gets electric, and then control relay K1's normally open contact actuation to insert the load of trouble (through loaddiode array) detection circuitry. At the moment, the voltage acquisition and power supply module starts to acquire the voltage of the circuit, the acquired voltage signal is sent to the control chip U2 through the anode of the electrolytic capacitor C12, the control chip U2 receives the voltage signal, firstly, A/D conversion is carried out on the voltage signal to obtain an effective value of the voltage, then, the resistance value of the grounding resistor of the load is calculated, and finally, whether the resistance value of the grounding resistor is larger than a preset electric leakage threshold value (100 omega) or not is judged; if yes, the earth fault is determined to occur, and at the moment, the control chip U2 controls a yellow light connected with the pin 2 of the control chip U2 to light to give an alarm. Wherein, the control coreWhen calculating the resistance value of the ground resistance of the load, the chip U2 calculates the voltage effective value U by the formula (1) and then calculates the ground resistance value R by the following formula (2)x：
When detecting whether the low-voltage circuit breaker is in a short-circuit fault, the control chip U2 controls the relay K2 to attract and enable a contact of the relay K2 to be switched from a 2 end to a 5 end to a1 end and a4 end, at the moment, an external +5V power supply (VCC) is conducted with an L line and an N line of a load, a voltage acquisition and power supply module starts to acquire the voltage of a circuit and transmits an acquired voltage signal to the control chip U2 through the anode of an electrolytic capacitor C12, the control chip U2 receives the voltage signal, firstly carries out A/D conversion to obtain an effective value of the voltage, then calculates the resistance value of a loop resistor of the load, and finally judges whether the resistance value of the loop resistor is smaller than a short-; if yes, the short-circuit fault is determined to occur, and at the moment, the control chip U2 controls a red light connected with the pin 10 of the control chip to light to give an alarm. When the control chip U2 calculates the resistance value of the loop resistor of the load, the voltage effective value U is calculated by the formula (1), and then the loop resistor value R is calculated by the following formula (3)x：
The utility model discloses both can regard as the module to install additional in the low voltage circuit breaker side, also can regard as hand-held type equipment to carry out load fault's detection.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (1)
1. The utility model provides a low pressure load fault detection device which characterized in that, includes voltage acquisition and power module, load electric leakage fault detection module, load short circuit fault detection module and control module, wherein:
the voltage acquisition and power supply module comprises a plug J1, a thermistor R1, a piezoresistor VDR1, a capacitor C6, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a capacitor C2, a diode D1, an electrolytic capacitor C4, a capacitor C3, a 24V power chip U1, a diode D4, a resistor R5, an electrolytic capacitor C11, a resistor R7, an electrolytic capacitor C12, a capacitor C7, a capacitor C5, an electrolytic capacitor C1, a diode D6, a zener diode D2, a diode D6372, an inductor L3, a zener diode D3, an electrolytic capacitor C3, a capacitor C8472 and a capacitor C3, wherein the plug J3 is used for being plugged in an alternating current power supply, a pin 2 of the plug J3 is connected with a live wire, a pin 1 of the plug J3 is connected with a zero wire, one end of the thermistor R3 is connected with a pin 2 of the plug J3, the other end of the plug J3 is connected with the VDR 3, and the other end of the plug is connected with the VDR 3, and the pin of the other end of, a capacitor C6 is connected in parallel with a voltage dependent resistor VDR1, one end of a resistor R2 is connected with the other end of the thermistor R1 and is connected with an external +5V power supply, the other end of a resistor R2 is connected with one end of a resistor R3, the other end of a resistor R3 is connected with one end of a resistor R4, the other end of a resistor R4 is connected with one end of a resistor R6, the other end of the resistor R6 is grounded, one end of a capacitor C6 is connected with one end of the resistor R6, the other end of the capacitor C6 is grounded, the anode of a diode D6 is connected with one end of the capacitor C6, the cathode of the diode D6 is connected with the anode of the electrolytic capacitor C6, the cathode of the electrolytic capacitor C6 is grounded, the capacitor C6 is connected in parallel with the electrolytic capacitor C6, the anode of the diode D6 is connected with the other end of the resistor R6, the cathode of the diode D6 is connected with the cathode of the electrolytic capacitor C6 in parallel with the diode D6, the cathode of the electrolytic capacitor C, the other end of the resistor R5 is connected with the anode of an electrolytic capacitor C12, the cathode of the electrolytic capacitor C12 is grounded, the pin 5, the pin 6, the pin 7 and the pin 8 of a 24V power supply chip U1 are all connected with the cathode of a diode D1, the pin 1 and the pin 2 of the 24V power supply chip U1 are all connected with one end of a capacitor C7, the other end of the capacitor C7 is grounded, the pin 3 of the 24V power supply chip U1 is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with one end of a capacitor C7, the pin 4 of the 24V power supply chip U1 is connected with the anode of an electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is connected with the cathode of a diode D6, the anode of a diode D6 is grounded, the cathode of a voltage stabilizing diode D2 is connected with the anode of an electrolytic capacitor C1, the anode of a stabilizing diode D2 is connected with the pin 3 of the 24V power supply chip U1, one end of an inductor L1 is connected with the anode of one end of the capacitor C, the anode of the diode D3 is connected with the cathode of the voltage stabilizing diode D5, the anode of the voltage stabilizing diode D5 is grounded, the other end of the inductor L1 is connected with the anode of the diode D3, and the electrolytic capacitor C8, the capacitor C9 and the capacitor C10 are all connected with the voltage stabilizing diode D5 in parallel;
the load leakage fault detection module comprises a resistor R8, a zener diode D8, a resistor R8, a capacitor C8, a zener diode D8, a diode D8, an electrolytic capacitor C8, a resistor R8, an electrolytic capacitor C8, a relay K8, a diode D8 and a patch transistor TR 8, wherein one end of the resistor R8 is connected with an external +5V power supply, the other end of the resistor R8 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the negative electrode of the zener diode D8, the positive electrode of the zener diode D8 is connected with the positive electrode of the zener diode D8, the negative electrode of the zener diode D8 is grounded, one end of the resistor R8 is connected with the other end of the resistor R8, the other end of the capacitor C8 is connected with the negative electrode of the zener diode D8, and the other end of the capacitor C8 is connected with the negative electrode of the zener diode D8. The anode of a voltage-stabilizing diode D10 is grounded, the anode of a diode D9 is connected with the other end of a capacitor C13, the cathode of a diode D9 is connected with the anode of an electrolytic capacitor C14, the cathode of an electrolytic capacitor C14 is grounded, a resistor R13 is connected with an electrolytic capacitor C14 in parallel, one end of a resistor R11 is connected with the cathode of a diode D9, the other end of a resistor R11 is connected with the anode of an electrolytic capacitor C15, the cathode of an electrolytic capacitor C15 is grounded, one end of a normally open contact of a relay K1 is connected with a wire outlet end of a low-voltage circuit breaker, the other end of the normally open contact of a relay K1 is connected with the other end of a resistor R9, one end of a coil of a relay K1V power chip U1, the other end of a coil of a relay K1 is connected with a pin 3 of a patch triode TR1, the cathode of a diode D7 is connected with one end of a coil of a relay K1, the, pin 2 of the patch transistor TR1 is grounded;
the load short-circuit fault detection module comprises a resistor R15, a relay K2, a diode D15, a patch triode TR2, a resistor R14, a capacitor C16, a capacitor C17, a diode D12, an electrolytic capacitor C18, a diode D13, a diode D14, a diode D16, a resistor R17 and an electrolytic capacitor C17, wherein one end of a coil of the relay K17 is connected with a pin 1 of a 24V power supply chip U17, the other end of the coil of the relay K17 is connected with a pin 3 of the patch triode TR 17, a pin 2 of the patch triode TR 17 is grounded, the cathode of the diode D17 is connected with one end of the coil of the relay K17, the anode of the diode D17 is connected with a pin 3 of the patch triode TR 17, a contact of the relay K17 is used for switching between a power supply incoming line of a load and two ends of the resistor R17, one end of the resistor R17 is connected with an external +5V power supply, the other end of the diode R, the anode of the diode D12 is further connected with the fixed end of the contact of the relay K2, the capacitor C16 and the capacitor C17 are both connected in parallel with the resistor R14, the cathode of the diode D12 is connected with the anode of the electrolytic capacitor C18, the cathode of the electrolytic capacitor C18 is grounded, the diode D13, the diode D14 and the diode D16 are connected in series and then connected in parallel with the electrolytic capacitor C18, the resistor R17 is connected in parallel with the electrolytic capacitor C18, one end of the resistor R16 is connected with the cathode of the diode D12, the other end of the resistor R16 is connected with the anode of the electrolytic capacitor C19, and the cathode of the electrolytic capacitor C19 is grounded;
the control module comprises a capacitor C21, a capacitor C22, a resistor R18, a control chip U2 and a capacitor C20, a pin 13 of the control chip U2 is connected with a pin 1 of a patch triode TR1, a pin 14 of the control chip U2 is connected with a pin 1 of a patch triode TR2, a pin 4 and a pin 6 of the control chip U2 and one end of a capacitor C21 are both connected with an external +5V power supply, the other end of the capacitor C21 is grounded, a pin 3 and a pin 5 of the control chip U2 are both grounded, a pin 18 and a pin 20 of the control chip U2 and one end of the capacitor C22 are both connected with an external +5V power supply, the other end of the capacitor C22 and a pin 21 of the control chip U2 are both grounded, a pin 19 of the control chip U2 is connected with the anode of an electrolytic capacitor C15, a pin 22 of the control chip U2 is connected with the anode of an electrolytic capacitor C19, a pin 27 of the control chip U56 is connected with the anode of a capacitor C12, and one end of the resistor R865 are, the other end of the resistor R18 is connected with one end of the capacitor C20, the other end of the capacitor C20 is grounded, the pin 29 of the control chip U2 is connected with the other end of the resistor R18, and the pin 2, the pin 9, the pin 10 and the pin 11 of the control chip U2 are respectively connected with an alarm lamp.
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| CN201922373109.0U CN211505803U (en) | 2019-12-26 | 2019-12-26 | Low-voltage load fault detection device |
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| CN201922373109.0U CN211505803U (en) | 2019-12-26 | 2019-12-26 | Low-voltage load fault detection device |
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