CN111352010B - Switch board insulation fault early warning device - Google Patents
Switch board insulation fault early warning device Download PDFInfo
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- CN111352010B CN111352010B CN202010328709.XA CN202010328709A CN111352010B CN 111352010 B CN111352010 B CN 111352010B CN 202010328709 A CN202010328709 A CN 202010328709A CN 111352010 B CN111352010 B CN 111352010B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
Abstract
The invention relates to a power distribution cabinet insulation fault early warning device, wherein a peak value acquisition circuit receives a power distribution cabinet insulation strength signal, under the control of a variable sampling clock with an NAND gate as a core, a peak value detection circuit extracts the peak value of the power distribution cabinet insulation strength signal, one path of the peak value signal enters a threshold value triggering conduction circuit, whether the insulation strength signal exceeds the threshold value is judged through the on-off of a high-voltage triggering circuit, when the threshold value is exceeded, the insulation strength signal enables one end of a primary coil of a transformer T1 to be in delayed connection with the ground, the other path of the primary coil enters an instantaneous judgment circuit, when the instantaneous or non-instantaneous high voltage is generated, a trigger triode Q7 is conducted or a triode Q2 is continuously conducted, the average value insulation strength signal or the insulation strength signal is added to the other end of a primary of a transformer T1 of a voltage reduction output circuit after being delayed, the possibility of early warning errors is avoided, when the secondary side of the transformer T1 induces the high voltage, the output signal drives the alarm to perform insulation fault early warning, and the transformer T1 drives the alarm circuit structure to realize timely alarm.
Description
Technical Field
The invention relates to the technical field of power distribution cabinets, in particular to an insulation fault early warning device for a power distribution cabinet.
Background
The switch board is insulating to be satisfied and to run for a long time under the switch board rated voltage and should instantaneously endure several times in the rated voltage requirement, if dielectric strength has the defect, switch board short circuit fault often takes place, and then the condition that leads to the distribution network accident takes place, can know the dielectric strength health status of switch board, realize carrying out accurate prediction, in time report to the police to switch board insulation fault, it takes place to reduce insulation fault, unnecessary power failure test and maintenance, accomplish to repair then, it is necessary to have improved electric power system reliability and economic nature.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the invention aims to provide a power distribution cabinet insulation fault early warning device, which can accurately predict the insulation fault of a power distribution cabinet and give an alarm in time.
The technical scheme is that the device comprises a peak value acquisition circuit, a threshold crossing triggering conduction circuit, an instantaneous discrimination circuit and a voltage reduction output circuit, and is characterized in that the peak value acquisition circuit receives insulation strength signals of a power distribution cabinet, under the control of a variable sampling clock formed by taking an NAND gate as a core, a peak value detection circuit formed by taking an operational amplifier AR1 and an operational amplifier AR2 as the core extracts the peak value of the insulation strength signals of the power distribution cabinet, one path of the peak value signals enters the threshold crossing triggering conduction circuit, whether the insulation strength signals exceed the threshold is judged through the on-off of a high-voltage triggering circuit formed by a voltage stabilizing tube Z1, a triode Q1 and a resistor R5, a thyristor VTL1 is triggered to be conducted when the insulation strength signals exceed the threshold, then the thyristor VTL1 is charged through a capacitor C1, a bidirectional diode SD1 is conducted, the triode Q6 is conducted, the other path enters the instantaneous discrimination circuit, the change of the peak value signals is converted into resistance through a memristor RM1, when the voltage is high instantaneously, the trigger triode Q7 is conducted, the signal is converted into a mean value insulation strength signal through the diode D6 and is added to the primary side of the transformer T1 of the voltage reduction output circuit, a small voltage is induced on the secondary side of the transformer T1, the diode D4 is cut off, no output signal drives the alarm, when the voltage is not high instantaneously, the trigger triode Q2 is conducted, the insulation strength signal is added to the primary side of the transformer T1 of the voltage reduction output circuit after being delayed through the conducting triode Q2 and a delay circuit consisting of the triodes Q3, Q4 and Q5, a high voltage is induced on the secondary side of the transformer T1, the diode D4 is conducted, and the output signal drives the alarm to perform insulation fault early warning.
The beneficial effects of the invention are: under the control of a variable sampling clock formed by taking a NAND gate as a core, a peak detection circuit extracts the peak value of the insulation strength signal of the power distribution cabinet according to the preset sampling clock frequency or 2-time-multiplication sampling clock frequency, so that the frequency of acquiring the insulation strength peak signal of the power distribution cabinet is increased, and the accuracy of data is improved;
2, when the insulation strength signal of the power distribution cabinet exceeds the threshold value, the trigger thyristor VTL1 is conducted, the insulation strength signal enables one end of the primary coil of the transformer T1 to be in delayed connection with the ground, the change of the front and rear peak value signals is converted into resistance value through the memristor RM1, the instantaneous high voltage is generated, the trigger triode Q7 is conducted, the peak value of the insulation strength signal is converted into an average value insulation strength signal through the diode D6 and is added to the other end of the primary of the transformer T1 of the voltage reduction output circuit, the trigger triode Q2 is continuously conducted during the non-instantaneous high voltage, the insulation strength signal is added to the other end of the primary of the transformer T1 of the voltage reduction output circuit after the delay of the delay circuit, the possibility of early warning error is avoided, the accuracy of predicting the insulation fault of the power distribution cabinet is improved, when the high voltage is induced by the secondary of the transformer T1, the diode D4 is conducted, the output signal drives the alarm to perform the insulation fault early warning, the transformer T1 drives the alarm circuit structure, and can realize timely alarm.
Drawings
Fig. 1 is a schematic diagram of a peak acquisition circuit of the present invention.
FIG. 2 is a schematic diagram of an over-threshold trigger-on circuit according to the present invention.
FIG. 3 is a schematic diagram of the instantaneous discrimination circuit of the present invention.
Fig. 4 is a schematic diagram of the step-down output circuit of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying drawings, in which FIGS. 1 to 4 are shown. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A power distribution cabinet insulation fault early warning device comprises a peak value obtaining circuit, an over-threshold triggering conduction circuit, an instantaneous judging circuit and a voltage reduction output circuit, wherein the peak value obtaining circuit receives a power distribution cabinet insulation strength signal, under the control of a variable sampling clock which is formed by taking an NAND gate as a core (when the variable sampling clock is closed at a normally open contact K1-1 of a relay K1 and is opened at a normally closed contact K1-2, a preset sampling clock controls the on-off frequency of a switch K2 after frequency doubling), an operational amplifier AR1 and an operational amplifier AR2 extract the peak value of the power distribution cabinet insulation strength signal from a peak value detection circuit which is formed by taking the core as the core, one path of the peak value signal enters the threshold triggering conduction circuit, whether the peak value of the insulation strength signal exceeds a threshold value is judged through the on-off of a high-voltage triggering circuit which is formed by a voltage stabilizing tube Z1, a triode Q1 and a resistor R5, when an insulation strength signal of the power distribution cabinet exceeds a threshold value, a voltage regulator tube Z1 is broken down, a triode Q1 is conducted, one path of +12V is added to one end of a coil of a relay K1 and the cathode of a diode D3, the other end of the coil of the relay K1 and the anode of a diode D3 are connected with the ground to form a loop for current circulation, at the moment, the coil of the relay K1 is electrified, the other path of the loop further triggers a thyristor VTL1 to be conducted, the insulation strength signal is charged through a capacitor C3, the voltage on the capacitor C3 is gradually increased, when the voltage is increased to the trigger voltage of a bidirectional diode SD1, a bidirectional diode SD1 is conducted, the triode Q6 is conducted in a saturated mode, one end of a primary coil of a transformer T1 is connected with the ground, namely, one end of the primary coil of the transformer T1 is connected to the ground in a delayed mode, the possibility of early warning errors caused by mistaken judgment of an instantaneous judgment circuit, the primary coil of the transformer T1 is avoided, and the early warning errors occur, the other path of the instantaneous circuit enters the instantaneous circuit, the change of a peak value signal is converted into a resistance value through a memristor RM1, when the instantaneous high voltage is generated, a trigger triode Q7 is conducted, the average value insulation strength signal is converted into an average value insulation strength signal through a diode D6, the average value insulation strength signal is added to the primary side of a transformer T1 of a voltage reduction output circuit, a small voltage is induced at the secondary side of the transformer T1, a diode D4 is cut off, no output signal drives an alarm, when the non-instantaneous high voltage is generated, the trigger triode Q2 is conducted, the insulation strength signal is delayed through a delay circuit formed by a conducted triode Q2 and then a triode Q3, a Q4 and a Q5, the delay circuit is added to the primary side of a transformer T1 of the voltage reduction output circuit, when the high voltage is induced at the secondary side of the transformer T1, the diode D4 is conducted, the output signal drives the alarm to perform insulation fault early warning, the accuracy of the prediction of the insulation fault of the power distribution cabinet is improved, the transformer T1 drives the alarm circuit structure, and the alarm can be timely realized.
In the embodiment of the invention, as shown in fig. 1, the peak value obtaining circuit receives a power distribution cabinet insulation strength signal (power distribution cabinet insulation strength detected by a power distribution cabinet insulation strength online detection device is transmitted and demodulated) and a variable sampling clock (when the variable sampling clock is closed at a normally open contact K1-1 and opened at a normally closed contact K1-2 of a relay K1, a preset sampling clock controls the on-off frequency of a switch K2 after frequency doubling and frequency doubling, and the sampling clock frequency doubling is provided by a pulse frequency multiplier which is composed of nand gates U2 and U3 of a model CD4011, resistors R4 and R20, capacitors C2 and C6 and is used for frequency doubling the preset sampling clock, wherein the nand gate U2 is an inverter and inverts the falling edge of an input pulse, so that the circuit outputs a pulse under the action of the rising edge and the falling edge of the input pulse respectively, realize circuit doubling), a peak detection circuit consisting of an operational amplifier AR1, an operational amplifier AR2, a resistor R1, a resistor R3, a diode D1, a diode D2 and a capacitor C1 extracts the peak value of an insulation strength signal of a power distribution cabinet, one path of the peak value signal enters a threshold value triggering conduction circuit, the other path of the peak value signal enters an instantaneous discrimination circuit and comprises a resistor R1, a normally open contact K1-1 of a relay K1, a normally closed contact K1-2 of a relay K1, one end of a resistor R1 is connected with the insulation strength signal, the other end of the resistor R1 is respectively connected with an inverting input end of an operational amplifier AR1, one end of a resistor R3 and the cathode of a diode D1, a non-inverting input end of the operational amplifier AR1 is connected to the ground through a resistor R2, an output end of the operational amplifier AR1 is respectively connected with the anode of a diode D1 and the anode of a diode D2, and the cathode of a diode D2 is connected with the left end of a switch K2, the right end of the switch K2 is respectively connected with one end of a grounded capacitor C1 and the non-inverting input end of an operational amplifier AR2, the inverting input end and the output end of an operational amplifier AR2 and the other end of a resistor R3 are peak circuit output signals, the left end of a normally open contact K1-1 of a relay K1 and the left end of a normally closed contact K1-2 of a relay K1 are connected with sampling clock signals, the right end of a normally open contact K1-1 of a relay K1 is connected with a pin 1 and a pin 2 of a NAND gate U2 and one end of a capacitor C2, the other end of the capacitor C2 is respectively connected with one end of a resistor R4 and a pin 1 of a NAND gate U3, a pin 3 of a NAND gate U2 is connected with one end of a capacitor C6, the other end of a capacitor C6 is respectively connected with one end of a resistor R20 and a pin 2 of a NAND gate U3, a pin 3 of a NAND gate U3 and the right end of a contact K1 are connected with the control end of a switch K2, and the right end of a contact K1 and the other end of a resistor R4 are connected with the control end of a switch K1-2, The other end of the resistor R20 is connected with a power supply of + 5V.
In the embodiment of the invention, as shown in fig. 2, the over-threshold trigger conduction circuit is used for judging whether the peak value of the insulation strength signal exceeds the threshold value through the on-off of a high-voltage trigger circuit composed of a voltage regulator tube Z1, a triode Q1 and a resistor R5, when the insulation strength signal of the power distribution cabinet exceeds the threshold value (namely, when the power distribution cabinet works and the insulation performance is worse), the voltage regulator tube Z1 is broken down, the triode Q1 is conducted, one path of +12V is added to one end of a coil of a relay K1 and the negative electrode of a diode D3, because the other end of the coil of the relay K1 is connected with the positive electrode of the diode D3 to form a loop for current circulation, at the moment, the coil of the relay K1 is electrified, a normally open contact K1-1 of the relay K1 is closed, and a normally closed contact K1-2 is disconnected, a preset sampling clock controls the on-off frequency of a switch K2 after double frequency, so as to increase the frequency of the obtained frequency of the insulation strength peak value signal of the power distribution cabinet, the accuracy of data is improved, the other path further triggers the conduction of the thyristor VTL1, an insulation strength signal is charged through the capacitor C3, the voltage on the capacitor C3 is gradually increased, when the voltage is increased to the trigger voltage of the bidirectional diode SD1, the bidirectional diode SD1 is conducted, further the triode Q6 is conducted in a saturated mode, one end of a primary coil of the transformer T1 is connected with the ground, namely, one end of the primary coil of the transformer T1 is connected to the ground in a delayed mode, the possibility that the transient discrimination circuit is wrong, the voltage of the primary coil of the transformer T1 is increased by mistake, and early warning errors occur is avoided, the circuit comprises a voltage stabilizing tube Z1, a thyristor VTL1, the negative electrode of a voltage stabilizing tube Z1, the anode of a thyristor VTL1 and a peak value obtaining circuit output signal, the positive electrode of the voltage stabilizing tube Z1 is respectively connected with the base electrode of the triode Q1 and one end of the grounding resistor R5, the collector electrode of the triode Q1 is connected with a power supply +12V, the emitter of the triode Q1 is respectively connected with the control electrode of the VTL1, The left end of a coil of the relay K1, the cathode of the diode D3, the right end of a coil of the relay K1 and the anode of the diode D3 are connected to the ground, the cathode of the thyristor VTL1 is respectively connected to one end of the resistor R11 and one end of the grounded capacitor C3, the other end of the resistor R11 is respectively connected to one end of the grounded capacitor C4 and the left end of the bidirectional diode SD1, the right end of the bidirectional diode SD1 is connected to the base of the triode Q6, the collector of the triode Q6 and the cathode of the diode D5 are used as output signals of an over-threshold trigger conduction circuit, the anode of the diode D5 is connected to the ground, and the emitter of the triode Q6 is connected to the ground through the resistor R10.
In the embodiment of the invention, as shown in fig. 3, the instantaneous discrimination circuit converts the change of the peak value signal into the resistance value through a memristor RM1, the instantaneous high voltage (when the peak value of the insulation strength signal exceeds the threshold instantaneously and is lower than 1 min), the triode Q2 is conducted for a short time, the charging voltage cannot enable the later stage circuit to work due to the charging of the electrolytic capacitor E1 through the resistor R7, then the low-voltage trigger triode Q7 is conducted, the peak value of the insulation strength signal is converted into the mean insulation strength signal through the diode D6, the mean insulation strength signal is added to the primary side of the transformer T1 of the step-down output circuit, a small voltage is induced in the secondary side of the transformer T1, the diode D4 is cut off, no output signal drives the alarm, when the non-instantaneous high voltage, the trigger triode Q2 is continuously conducted, the insulation strength signal is charged to the electrolytic capacitor E1 through the resistor R7 through the conducting triode Q2, the charging time is long, the charging voltage delays a delay circuit consisting of triodes Q3, Q4 and Q5 and then is added to the primary side of a transformer T1 of the step-down output circuit, high voltage is induced in the secondary side of the transformer T1, a diode D4 is conducted, an output signal drives an alarm to perform insulation fault early warning, the alarm comprises a memristor RM1, the control end of the memristor RM1 is connected with a peak value acquisition circuit output signal, the left end of the memristor RM1 is connected with the ground, the right end of the memristor RM1 is respectively connected with the base of a triode Q2, the base of a triode Q7 and one end of a resistor R6, the other end of the resistor R6 is connected with a power supply +12V, the emitter of the triode Q2 and the emitter of the triode Q7 are connected with the cathode of a thyristor VTL1, the collector of the triode Q2 is respectively connected with one end of a resistor R7, one end of a resistor R8 and the emitter of a triode Q3, the other end of the resistor R35 7 is respectively connected with the positive electrode of an electrolytic capacitor E1 and the collector of a transistor Q4, the base of the triode Q4 is connected with the base of the triode Q5, the negative electrode of the electrolytic capacitor E1, the emitter of the triode Q4 and the emitter of the triode Q5 are connected to the ground, the collector of the triode Q5 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with the other end of the resistor R8 and the base of the triode Q3 respectively, the collector of the triode Q7 is connected with the positive electrode of the diode D6, the negative electrode of the diode D6 is connected with one end of the resistor R10, and the other end of the resistor R10 and the collector of the triode Q3 are output signals of the instantaneous judging circuit.
In the embodiment of the invention, as shown in fig. 4, the step-down output circuit steps down through a step-down transformer, so that the secondary insulation prediction result of the transformer T1, namely high voltage and low voltage, is induced by the secondary of the transformer T1 to obtain very small voltage or high voltage after step-down, when the high voltage is detected, namely the insulation prediction is failure, the diode D4 is conducted, the output signal drives the alarm to perform insulation failure early warning, the transformer T1 drives the alarm circuit structure to realize timely alarm, the voltage drives the alarm to perform alarm, the simple sound alarm of the PNP triode driving buzzer is provided, which is the prior art, and the details are not described herein, the step-down output circuit comprises a transformer T1, one end of the primary coil of the transformer T1 is connected with the threshold value triggering conduction circuit output signal, the other end of the primary coil of the transformer T1 is connected with the instantaneous discrimination circuit output signal, one end of the secondary coil of the transformer T1 is connected with the anode of the diode D4, and the cathode of the diode D4 and the other end of the secondary coil of the transformer T1 output signals to drive an alarm for insulation fault early warning.
When the peak value acquisition circuit is used specifically, the peak value acquisition circuit receives an insulation strength signal of a power distribution cabinet under the control of a variable sampling clock formed by taking an NAND gate as a core, the operational amplifier AR1, the operational amplifier AR2, a resistor R1-a resistor R3, a diode D1, a diode D2 and a capacitor C1 carry out preset sampling clock frequency or 2-frequency multiplication sampling clock frequency to extract the peak value of the insulation strength signal of the power distribution cabinet, one path of the peak value signal enters a threshold value triggering and conducting circuit, whether the peak value of the insulation strength signal exceeds a threshold value is judged through the on-off of a high-voltage triggering circuit, when the insulation strength signal of the power distribution cabinet exceeds the threshold value, a voltage regulator tube Z1 is broken down, a triode Q1 is conducted, the normally open coil of a relay K1 is powered on by the path of +12V, a normally open contact K1-1 of the relay K1 is closed, and a normally closed contact K1-2 is disconnected, the variable sampling clock is controlled to carry out 2-frequency multiplication sampling clock frequency switching from the preset sampling clock frequency The frequency of obtaining a peak value signal of the insulation strength of the power distribution cabinet is increased, the accuracy of data is improved, the thyristor VTL1 is triggered to be conducted by the other 12V path, the insulation strength signal is charged through the capacitor C3, the voltage on the capacitor C3 is gradually increased, when the voltage is increased to the trigger voltage of the bidirectional diode SD1, the bidirectional diode SD1 is conducted, the triode Q6 is further conducted in a saturated mode, one end of a primary coil of the transformer T1 is connected to the ground, namely, one end of the primary coil of the transformer T1 is conducted to the ground in a delayed mode, the possibility of early warning errors caused by the fact that the primary coil of the transformer T1 is increased in voltage in a wrong mode is avoided, the other path of the peak value signal enters the instantaneous judgment circuit, the change of the peak value signal is converted into a resistance value through the memristor RM1, the instantaneous high voltage is obtained, the triode Q2 is conducted for a short time, and the electrolytic capacitor E1 is charged through the resistor R7, so that the charging time is short, the voltage is obtained, The charging voltage can not make the post-stage circuit work, then the low-voltage trigger triode Q7 is conducted, the peak value of the insulation strength signal is converted into a mean value insulation strength signal through the diode D6, the mean value insulation strength signal is added to the primary side of the transformer T1 of the step-down output circuit, a small voltage is induced on the secondary side of the transformer T1, the diode D4 is cut off, no output signal drives the alarm, when the non-instantaneous high voltage is generated, the trigger triode Q2 is continuously conducted, the insulation strength signal is charged to the electrolytic capacitor E1 through the conducted triode Q2 and the resistor R7, the charging time is long, the charging voltage enables the time delay circuit formed by the triodes Q3, Q4 and Q5 to be added to the primary side of the transformer T1 of the step-down output circuit after the time delay, the high voltage is induced on the secondary side of the transformer T1, the diode D4 is conducted, the output signal drives the alarm to early warn the insulation fault, the possibility of the error is avoided, the possibility of the error is improved, the prediction accuracy of the insulation fault is improved, the transformer T1 drives the alarm circuit structure, and can realize timely alarm.
Claims (3)
1. A power distribution cabinet insulation fault early warning device comprises a peak value obtaining circuit, a threshold value passing triggering conduction circuit, an instantaneous discrimination circuit and a voltage reduction output circuit, and is characterized in that the peak value obtaining circuit receives a power distribution cabinet insulation strength signal, under the control of a variable sampling clock formed by taking an NAND gate as a core, a peak value detection circuit formed by taking an operational amplifier AR1 and an operational amplifier AR2 as the core extracts the peak value of the power distribution cabinet insulation strength signal, one path of the peak value signal enters the threshold value triggering conduction circuit, whether the insulation strength signal exceeds the threshold value is judged through the on-off of a high-voltage trigger circuit formed by a voltage stabilizing tube Z1, a triode Q1 and a resistor R5, when the insulation strength signal exceeds the threshold value, a thyristor VTL1 is triggered to be conducted, then the power distribution cabinet insulation fault early warning device is charged by a capacitor C1, a bidirectional diode SD1 is conducted, the triode Q6 is conducted, the other path of the instantaneous discrimination circuit enters the instantaneous discrimination circuit, the variation of the peak value signal is converted into a resistor by a memory RM1, when the voltage is high instantaneously, the trigger triode Q7 is conducted, the signal is converted into a mean value insulation strength signal through the diode D6 and is added to the primary side of the transformer T1 of the voltage reduction output circuit, a small voltage is induced on the secondary side of the transformer T1, the diode D4 is cut off, no output signal drives the alarm, when the voltage is not high instantaneously, the trigger triode Q2 is conducted, the insulation strength signal is added to the primary side of the transformer T1 of the voltage reduction output circuit after being delayed through the conducting triode Q2 and a delay circuit consisting of the triodes Q3, Q4 and Q5, a high voltage is induced on the secondary side of the transformer T1, the diode D4 is conducted, and the output signal drives the alarm to perform insulation fault early warning;
the over-threshold triggering and conducting circuit comprises a voltage regulator tube Z1 and a thyristor VTL1, wherein the negative electrode of a voltage regulator tube Z1 and the positive electrode of a thyristor VTL1 are connected with a peak value acquisition circuit output signal, the positive electrode of the voltage regulator tube Z1 is respectively connected with the base electrode of a triode Q1 and one end of a grounding resistor R5, the collector electrode of the triode Q1 is connected with +12V, the emitter electrode of the triode Q1 is respectively connected with the control electrode of the thyristor VTL1, the left end of a relay K1 coil and the negative electrode of a diode D3, the right end of the relay K1 coil and the positive electrode of a diode D3 are connected with ground, the cathode electrode of a VTL1 is respectively connected with one end of a resistor R11 and one end of a grounding capacitor C3, the other end of the resistor R11 is respectively connected with one end of a grounding capacitor C4 and the left end of a bidirectional diode SD1, the right end of a bidirectional diode SD1 is connected with the base electrode of a triode Q6, the collector electrode of the triode Q6 and the negative electrode of the diode D5 are output signal of the over-threshold triggering and conducting circuit output signal, the anode of the diode D5 is connected to ground, and the emitter of the triode Q6 is connected to ground through the resistor R10;
the instantaneous judging circuit comprises a memristor RM1, the control end of the memristor RM1 is connected with the output signal of the peak value obtaining circuit, the left end of the memristor RM1 is connected with the ground, the right end of the memristor RM1 is respectively connected with the base of a triode Q2, the base of a triode Q7 and one end of a resistor R6, the other end of the resistor R6 is connected with a power supply +12V, the emitter of a triode Q2 and the emitter of a triode Q7 are connected with the cathode of a thyristor VTL1, the collector of a triode Q2 is respectively connected with one end of a resistor R7, one end of a resistor R8 and the emitter of a triode Q3, the other end of a resistor R7 is respectively connected with the anode of an electrolytic capacitor E1 and the collector of a triode Q4, the base of a triode Q4 is connected with the base of a triode Q5, the cathode of the electrolytic capacitor E1, the emitter of a triode Q4 and the emitter of a triode Q5 are connected with the ground, the collector of the triode Q5 is connected with one end of a resistor R9, the other end of the resistor R9 is respectively connected with the other end of the peak value R8, The base of the triode Q3, the collector of the triode Q7 are connected with the anode of the diode D6, the cathode of the diode D6 is connected with one end of the resistor R10, and the other end of the resistor R10 and the collector of the triode Q3 are output signals of the instantaneous discrimination circuit.
2. The insulation fault early warning device of the power distribution cabinet according to claim 1, wherein the peak value obtaining circuit comprises a resistor R1, a normally open contact K1-1 of a relay K1, a normally closed contact K1-2 of a relay K1, one end of a resistor R1 is connected with the insulation strength signal, the other end of the resistor R1 is respectively connected with the inverting input end of an operational amplifier AR1, one end of a resistor R3 and the cathode of a diode D1, the non-inverting input end of the operational amplifier AR1 is connected with the ground through a resistor R2, the output end of the operational amplifier AR1 is respectively connected with the anode of the diode D1 and the anode of a diode D2, the cathode of the diode D2 is connected with the left end of a switch K2, the right end of the switch K2 is respectively connected with one end of a grounded capacitor C1 and the non-inverting input end of the operational amplifier AR2, the inverting input end and the output end of the operational amplifier AR2 and the other end of the resistor R3 are the peak value circuit output signal, the left end of a normally open contact K1-1 of a relay K1 and the left end of a normally closed contact K1-2 of a relay K1 are connected with a sampling clock signal, the right end of a normally open contact K1-1 of a relay K1 is connected with a pin 1 and a pin 2 of a NAND gate U2 and one end of a capacitor C2, the other end of the capacitor C2 is respectively connected with one end of a resistor R4 and a pin 1 of a NAND gate U3, a pin 3 of the NAND gate U2 is connected with one end of a capacitor C6, the other end of the capacitor C6 is respectively connected with one end of a resistor R20 and a pin 2 of the NAND gate U3, a pin 3 of the NAND gate U3 and the right end of a normally closed contact K1-2 of the relay K1 are connected with a control end of a switch K2, and the other end of the resistor R4 and the other end of the resistor R20 are connected with a power supply + 5V.
3. The insulation fault early warning device of the power distribution cabinet according to claim 1, wherein the step-down output circuit comprises a transformer T1, one end of a primary coil of the transformer T1 is connected with an output signal of a threshold-crossing triggering conducting circuit, the other end of the primary coil of the transformer T1 is connected with an output signal of an instantaneous discrimination circuit, one end of a secondary coil of the transformer T1 is connected with an anode of a diode D4, a cathode of the diode D4 and an output signal of the other end of the secondary coil of the transformer T1 drive the alarm to perform insulation fault early warning.
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| CN202010328709.XA CN111352010B (en) | 2020-04-23 | 2020-04-23 | Switch board insulation fault early warning device |
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| CN202010328709.XA CN111352010B (en) | 2020-04-23 | 2020-04-23 | Switch board insulation fault early warning device |
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| CN111352010B true CN111352010B (en) | 2022-06-14 |
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Citations (11)
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Denomination of invention: An insulation fault warning device for distribution cabinets Effective date of registration: 20230720 Granted publication date: 20220614 Pledgee: China Postal Savings Bank Co.,Ltd. Yantai Development Zone sub branch Pledgor: YANTAI HAIFA ELECTRIC SCIENCE & TECHNOLOGY CO.,LTD. Registration number: Y2023980049120 |