CN115963429A - Electric leakage detection device for power switch cabinet - Google Patents
Electric leakage detection device for power switch cabinet Download PDFInfo
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- CN115963429A CN115963429A CN202310250350.2A CN202310250350A CN115963429A CN 115963429 A CN115963429 A CN 115963429A CN 202310250350 A CN202310250350 A CN 202310250350A CN 115963429 A CN115963429 A CN 115963429A
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Abstract
The invention discloses an electric leakage detection device of a power switch cabinet, which relates to the technical field of electric leakage detection and comprises an electric leakage current detection module, a control module and a power supply module, wherein the electric leakage current detection module is used for detecting electric leakage current and isolating transmission; the two-way partial pressure detection module is used for partial pressure sampling; the intelligent control module is used for receiving signals and controlling the module; the leakage detection module is used for detecting leakage noise; the amplifying and filtering module is used for filtering and amplifying signals; the analog compensation module is used for signal superposition and gain adjustment; and the differential amplification module is used for differential amplification. According to the electric power switch cabinet electric leakage detection device, the electric leakage current of the electric power switch cabinet is detected by the electric leakage current detection module, the intelligent control module is matched with the sampling signal output by the double-path voltage division detection module to judge the interference degree of the signal and judge whether electric leakage exists or not, the electric leakage detection module judges the electric leakage position through noise detection, the signal processing is carried out through the amplification filtering module and the differential amplification module, and the analog compensation module carries out superposition processing and gain adjustment on the detected signal.
Description
Technical Field
The invention relates to the technical field of electric leakage detection, in particular to an electric leakage detection device of a power switch cabinet.
Background
The power switch cabinet is very important electrical equipment of a power system, and is often used for power generation, switching of the electrical equipment in the power transmission and distribution and electric energy conversion processes, control and protection, because of aging of cables, poor grounding and other factors easily cause the leakage phenomenon of the switch cabinet, and mechanical failure and personnel safety problems are easily caused.
Disclosure of Invention
The embodiment of the invention provides a power switch cabinet electric leakage detection device, which aims to solve the problems in the background technology.
According to an embodiment of the present invention, there is provided a power switch cabinet leakage detection apparatus, including: the device comprises a leakage current detection module, a two-way voltage division detection module, an intelligent control module, a power supply module, a leakage detection module, an amplification filtering module, an analog compensation module and a differential amplification module;
the leakage current detection module is used for detecting whether the power switch cabinet generates leakage current and outputting a first detection signal, and is used for receiving the first detection signal and outputting a second detection signal through the isolation transformation circuit;
the double-path voltage division detection module is connected with the leakage current detection module and the intelligent control module, and is used for performing voltage division sampling on the first detection signal through a capacitance voltage division circuit and outputting a first sampling signal, and is used for performing voltage division sampling on the second detection signal through a resistance voltage division circuit and outputting a second sampling signal;
the intelligent control module is used for receiving the signals of the two-way partial pressure detection module, performing analog-to-digital conversion on the signals output by the differential amplification module, receiving the converted signals, outputting compensation signals and controlling the work of the analog compensation module, and outputting control signals and controlling the work of the power supply module;
the power supply module is connected with the intelligent control module and used for receiving the control signal and controlling the power supply circuit to output direct current voltage stabilization;
the leakage detection module is connected with the power supply module and used for receiving the electric energy of the power supply module, controlling the leakage detection circuit to perform noise detection and outputting a leakage signal;
the amplifying and filtering module is connected with the power supply module and the electric leakage detection module, and is used for performing high-pass filtering and low-pass filtering processing on the electric leakage signal and outputting a first voltage signal, and is used for performing signal amplifying processing on the first voltage signal and outputting a second voltage signal;
the analog compensation module is connected with the power supply module, the amplification and filtering module and the intelligent control module, is used for controlling the work of a compensation circuit through the compensation signal, is used for superposing the first voltage signal and the second voltage signal through the compensation circuit and outputting a third voltage signal, and is used for adjusting the gain effect of the differential amplification module;
and the differential amplification module is connected with the intelligent control module, the power supply module, the amplification filtering module and the analog compensation module and is used for carrying out differential processing on the third voltage signal through a differential amplification circuit and outputting a differential signal.
Compared with the prior art, the invention has the beneficial effects that: according to the electric power switch cabinet leakage detection device, the leakage current generated when the electric power switch cabinet leaks electricity is detected by the leakage current detection module, and the two-way voltage division detection module performs two-way voltage division sampling, so that the intelligent control module can detect the interference degree of a sampling signal and judge whether the electric power switch cabinet leaks electricity, then the power supply module supplies power, the leakage detection module is controlled to judge the position where the leakage occurs through noise detection, the detected signal is respectively subjected to filtering amplification and differential anti-interference processing through the amplification filtering module and the differential amplification module, meanwhile, the intelligent control module controls the analog compensation module to perform superposition processing on the detected signal and adjust the gain effect of the differential amplification module, the signal detection precision is improved, the positions where the leakage occurs and the leakage occur are accurately detected, and the device energy consumption is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a power switchgear leakage detection apparatus according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of an electric leakage detection device for a power switch cabinet according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of an analog compensation module according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a power module according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In embodiment 1, referring to fig. 1, the power switch cabinet leakage detecting apparatus includes: the device comprises a leakage current detection module 1, a two-way voltage division detection module 2, an intelligent control module 3, a power supply module 4, a leakage detection module 5, an amplification filtering module 6, an analog compensation module 7 and a differential amplification module 8;
specifically, the leakage current detection module 1 is configured to detect whether a power switch cabinet generates a leakage current and output a first detection signal, and is configured to receive the first detection signal and output a second detection signal through an isolation transformer circuit;
the double-path voltage division detection module 2 is connected with the leakage current detection module 1 and the intelligent control module 3, is used for performing voltage division sampling on the first detection signal through a capacitance voltage division circuit and outputting a first sampling signal, and is used for performing voltage division sampling on the second detection signal through a resistance voltage division circuit and outputting a second sampling signal;
the intelligent control module 3 is used for receiving the signal of the two-way partial pressure detection module 2, performing analog-to-digital conversion processing on the signal output by the differential amplification module 8, receiving the converted signal, outputting a compensation signal and controlling the work of the analog compensation module 7, and outputting a control signal and controlling the work of the power supply module 4;
the power supply module 4 is connected with the intelligent control module 3 and used for receiving the control signal and controlling the power supply circuit to output direct current voltage stabilization;
the leakage detection module 5 is connected with the power module 4 and used for receiving the electric energy of the power module 4, controlling the leakage detection circuit to perform noise detection and outputting a leakage signal;
the amplifying and filtering module 6 is connected with the power module 4 and the electric leakage detection module 5, and is used for performing high-pass filtering and low-pass filtering on the electric leakage signal and outputting a first voltage signal, and is used for performing signal amplifying processing on the first voltage signal and outputting a second voltage signal;
the analog compensation module 7 is connected with the power module 4, the amplification filtering module 6 and the intelligent control module 3, is used for controlling the work of a compensation circuit through the compensation signal, is used for superposing the first voltage signal and the second voltage signal through the compensation circuit and outputting a third voltage signal, and is used for adjusting the gain effect of the differential amplification module 8;
and the differential amplification module 8 is connected with the intelligent control module 3, the power supply module 4, the amplification filtering module 6 and the analog compensation module 7, and is used for performing differential processing on the third voltage signal through a differential amplification circuit and outputting a differential signal.
In a specific embodiment, the leakage current detection module 1 may adopt a transformer detection circuit and an isolation transformation circuit, the transformer detection circuit detects a leakage current condition of the power switch cabinet, and the isolation transformation circuit performs step-down isolation output; the two-way voltage division detection module 2 can adopt a capacitance voltage division circuit and a resistance voltage division circuit, the capacitance voltage division circuit performs voltage division sampling on a signal detected by the mutual inductor detection circuit, and the resistance voltage division circuit performs voltage division detection on a signal output by the isolation transformation circuit; the intelligent control module 3 can adopt an analog-digital conversion circuit and a micro-control circuit, the analog-digital conversion circuit performs mode conversion, and the micro-control circuit can adopt but is not limited to microcontrollers such as a single chip microcomputer and a DSP, integrates a plurality of components such as an arithmetic unit, a controller, a memory, an input/output device and the like, and realizes functions such as signal processing, data storage, module control, timing control and the like; the power module 4 can adopt an isolation control circuit and a power circuit, the isolation control circuit controls the work of the power circuit, and the power circuit provides required direct current voltage stabilization for the subsequent modules; the leakage detection module 5 may adopt a leakage detection circuit composed of an ultrasonic circuit, and completes the judgment of the leakage position by detecting noise; the amplifying and filtering module 6 can adopt a band-pass filtering module and an amplifying module to carry out high-pass filtering, low-pass filtering and signal amplifying processing on signals; the analog compensation module 7 may adopt a compensation circuit, and is configured to perform superposition processing on the signal output by the amplification and filtering module 6 and adjust a gain value of the differential amplification module 8; the differential amplification module 8 can adopt a differential amplification circuit to perform differential amplification processing on input signals, so that noise interference is reduced, and detection precision is improved.
specifically, a first end and a second end of the circuit switch cabinet are respectively connected with a first end and a second end of a first transformer U5, a third end and a fourth end of the first transformer U5 are respectively connected with a first end and a second end of a primary side of a first transformer W1, a first end and a second end of a secondary side of the first transformer W1 are respectively connected with a first end and a second end of a primary side of a second transformer W2, a first end of a secondary side of the second transformer W2 is connected with a first end of a first resistor R1 through a first inductor L1, and a second end of the first resistor R1 is connected with a second end and a ground end of a secondary side of the second transformer W2 through a first capacitor C1.
In a specific embodiment, the first transformer U5 may be a current transformer, and the specific type is not limited; the first transformer W1 may be a coupling transformer for isolation transmission and impedance matching, and the second transformer W2 may be a conventional step-down transformer, which is not described herein.
Further, the two-way voltage division detection module 2 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, and a third capacitor C3; the intelligent control module 3 comprises a first controller U1;
specifically, the second IO end of the first controller U1 is connected to one end of the second resistor R2 and is grounded through the third resistor R3, the first end of the secondary side of the first transformer W1 is connected to one end of the fourth resistor R4 and one end of the second capacitor C2, the first end of the fifth resistor R5, the other end of the second capacitor C2, the first end of the third capacitor C3 and the first IO end of the first controller U1 are connected to the other end of the fourth resistor R4, and the other end of the fifth resistor R5 and the other end of the third capacitor C3 are grounded.
In a specific embodiment, the second resistor R2 and the third resistor R3 form a resistor voltage dividing circuit, and the fourth resistor R4, the fifth resistor R5, the second capacitor C2 and the third capacitor C3 form a capacitor voltage dividing circuit, which all divide a signal detected by the first transformer U5; the first controller U1 can be selected, but is not limited to an STM32 single chip microcomputer, and receives a divided signal to determine whether the power switch cabinet generates a leakage current.
Further, the power module 4 includes a first optocoupler J1, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a first key switch S1, a first power tube Q1, a direct-current power supply, and a multi-path voltage regulator;
specifically, the first end of the first optocoupler J1 is connected to the fourth IO end of the first controller U1, the second end of the first optocoupler J1 is grounded, the third end of the first optocoupler J1 is connected to the first end of the direct current power supply through an eighteenth resistor R18, the fourth end of the first optocoupler J1 is connected to the one end of the first key switch S1, the grid of the first power tube Q1 and the one end of the twentieth resistor R20, the other end of the twentieth resistor R20 is grounded, the other end of the first key switch S1 is connected to the second end of the direct current power supply and the drain of the first power tube Q1 through a nineteenth resistor R19, and the source of the first power tube Q1 is connected to the input end of the multi-path voltage regulator.
In a specific embodiment, the first optical coupler J1 may be a PC817 optoelectronic coupler, and is used for signal isolation transmission; the first power tube Q1 can be an N-channel enhanced MOS tube and is controlled by a first key switch S1 and a first optocoupler J1; the multi-path voltage stabilizing device can adopt a multi-path switching power supply circuit to provide multi-path voltage stabilization, which is not described herein.
Further, the electric leakage detection module 5 includes an ultrasonic sensor; the amplifying and filtering module 6 comprises a band-pass filtering device, a sixth resistor R6, a first operational amplifier OP1 and a seventh resistor R7;
specifically, the ultrasonic sensor is connected with an input end of a band-pass filter device, an output end of the band-pass filter device is connected with an inverting end of a first operational amplifier OP1 through a sixth resistor R6, a non-inverting end of the first operational amplifier OP1 is grounded through a seventh resistor R7, and an output end of the first operational amplifier OP1 is connected with the analog compensation module 7 and the differential amplification module 8.
In a specific embodiment, the ultrasonic sensor detects slight noise generated during electric leakage to judge the position of the electric leakage, the specific model is not limited, and the ultrasonic sensor can be composed of a plurality of ultrasonic sensors to improve the detection accuracy; the band-pass filtering device can adopt a high-pass filter and a low-pass filter to realize the filtering processing of signals, which is not described herein; the first operational amplifier OP1 can be selected from, but not limited to, OP07 operational amplifiers for signal amplification.
Further, the analog compensation module 7 includes a fourth capacitor C4, a fourteenth resistor R14, a fifteenth resistor R15, a first voltage regulator VD1, a sixteenth resistor R16, a second controller U4, and a seventeenth resistor R17;
specifically, one end of the fifteenth resistor R15, one end of the fourteenth resistor R14, and one end of the fourth capacitor C4 are all connected to the inverting terminal of the first operational amplifier OP1, the other end of the fourteenth resistor R14 is connected to the other end of the fourth capacitor C4, the second end of the second controller U4, the first end of the seventeenth resistor R17, and the output terminal of the first operational amplifier OP1, the second end of the seventeenth resistor R17 is connected to the differential amplification module 8, the ninth end of the second controller U4 is connected to the cathode of the first voltage regulator VD1, one end of the sixteenth resistor R16, and the third IO end of the first controller U1, the anode of the first voltage regulator VD1, the other end of the sixteenth resistor R16, the seventh end, the eighth end, the third end, and the fourth end of the second controller U4 are all grounded, and the tenth end and the fifth end of the second controller U4 are all connected to the output terminal of the multi-path voltage regulator.
In a specific embodiment, the second controller U4 may use an ADG621 chip, and the first controller U1 controls a potential of the ninth terminal of the second controller U4 to control the operation of the second controller U4.
Further, the differential amplification module 8 includes a first amplifier U3, a ninth resistor R9, an eighth resistor R8, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13; the intelligent control module 3 further comprises an analog-to-digital converter U2;
specifically, one end of the ninth resistor R9 is connected to the output end of the first operational amplifier OP1 and the first end of the seventeenth resistor R17, the other end of the ninth resistor R9 is connected to the eighth end of the first amplifier U3 and one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the fifth end of the first amplifier U3, one end of the twelfth resistor R12 and the second end of the seventeenth resistor R17, the second end of the first amplifier U3 is grounded, the first end of the first amplifier U3 is connected to one end of the eleventh resistor R11 and is grounded through the eighth resistor R8, the fourth end of the first amplifier U3 is connected to the other end of the eleventh resistor R11 and is connected to the first input end of the analog-to-digital converter U2 through the thirteenth resistor R13, the other end of the twelfth resistor R12 is connected to the second input end of the analog-to-digital converter U2, the output end of the analog-to-digital converter U2 is connected to the fifth IO end of the first controller U1, and the third end and the sixth end of the multi-path voltage stabilizing device are connected to the output end of the multi-path voltage stabilizing device.
In a specific embodiment, the first amplifier U3 may use an AD8138 operational amplifier, and a ninth resistor R9, an eighth resistor R8, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13 form a differential amplification circuit, and the second controller U4 adjusts the electric energy input to the seventeenth resistor R17 to adjust the gain value of the first amplifier U3; the analog-to-digital converter U2 can be used for analog-to-digital conversion, but is not limited to the AD7356 chip.
The invention relates to a leakage detection device of a power switch cabinet, which detects the electric energy condition of the power switch cabinet through a first mutual inductor U5, carries out isolated step-down transmission by a first transformer W1 and a second transformer W2, simultaneously carries out voltage division sampling on a second resistor R2 and a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second capacitor C2 and a third capacitor C3 respectively, transmits the sampled signals to a first controller U1, judges whether the power switch cabinet generates leakage current or not through the first controller U1, if the leakage current is generated, the first controller U1 controls the conduction of a first power tube Q1 through a first optical coupler J1 to control the work of an ultrasonic sensor, a plurality of groups of ultrasonic sensors judge the leakage position through noise detection, signals detected by a plurality of groups of ultrasonic sensors are subjected to signal filtering and signal amplification processing through a band-pass filtering device and a first operational amplifier OP1 and are input into a first amplifier U3, meanwhile, a first controller U1 controls a second controller U4 to work, so that the second controller U4 superposes signals before amplification and the signals after amplification, meanwhile, the gain effect of the first amplifier U3 is adjusted through controlling electric energy transmitted by a seventeenth resistor R17, the working efficiency of the first amplifier U3 is improved, the precision of the detected signals is improved, then, an analog-to-digital converter U2 performs analog-to-digital conversion on the signals output by the first amplifier U3 and transmits the signals to the first controller U1, the specific electric leakage position is calculated through the first controller U1, and meanwhile, the ultrasonic sensors can be directly controlled to access to work by directly pressing a first key switch S1.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. Electric power switch cabinet electric leakage detection device, its characterized in that:
this electric power switch cabinet electric leakage detection device includes: the device comprises a leakage current detection module, a two-way voltage division detection module, an intelligent control module, a power supply module, a leakage detection module, an amplification filtering module, an analog compensation module and a differential amplification module;
the leakage current detection module is used for detecting whether the power switch cabinet generates leakage current and outputting a first detection signal, and is used for receiving the first detection signal and outputting a second detection signal through the isolation transformation circuit;
the two-way voltage division detection module is connected with the leakage current detection module and the intelligent control module, and is used for performing voltage division sampling on the first detection signal through a capacitance voltage division circuit and outputting a first sampling signal, and is used for performing voltage division sampling on the second detection signal through a resistance voltage division circuit and outputting a second sampling signal;
the intelligent control module is used for receiving the signals of the two-way partial pressure detection module, performing analog-to-digital conversion on the signals output by the differential amplification module, receiving the converted signals, outputting compensation signals and controlling the work of the analog compensation module, and outputting control signals and controlling the work of the power supply module;
the power supply module is connected with the intelligent control module and used for receiving the control signal and controlling the power supply circuit to output direct current voltage stabilization;
the leakage detection module is connected with the power supply module and used for receiving the electric energy of the power supply module, controlling the leakage detection circuit to perform noise detection and outputting a leakage signal;
the amplifying and filtering module is connected with the power supply module and the electric leakage detection module, and is used for performing high-pass filtering and low-pass filtering processing on the electric leakage signal and outputting a first voltage signal, and is used for performing signal amplifying processing on the first voltage signal and outputting a second voltage signal;
the analog compensation module is connected with the power supply module, the amplification and filtering module and the intelligent control module, is used for controlling the work of a compensation circuit through the compensation signal, is used for superposing the first voltage signal and the second voltage signal through the compensation circuit and outputting a third voltage signal, and is used for adjusting the gain effect of the differential amplification module;
and the differential amplification module is connected with the intelligent control module, the power supply module, the amplification filtering module and the analog compensation module and is used for carrying out differential processing on the third voltage signal through a differential amplification circuit and outputting a differential signal.
2. The power switch cabinet leakage detection device according to claim 1, wherein the leakage current detection module comprises a power switch cabinet, a first transformer, a second transformer, a first inductor, a first resistor and a first capacitor;
the first end and the second end of the circuit switch cabinet are respectively connected with the first end and the second end of the first mutual inductor, the third end and the fourth end of the first mutual inductor are respectively connected with the first end and the second end of the primary side of the first transformer, the first end and the second end of the secondary side of the first transformer are respectively connected with the first end and the second end of the primary side of the second transformer, the first end of the secondary side of the second transformer is connected with the first end of the first resistor through the first inductor, and the second end of the first resistor is connected with the second end and the ground end of the secondary side of the second transformer through the first capacitor.
3. The electric leakage detection device of the power switch cabinet according to claim 2, wherein the two-way voltage division detection module comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second capacitor and a third capacitor; the intelligent control module comprises a first controller;
one end of the second resistor is connected with a second IO end of the first controller and is grounded through the third resistor, one end of the fourth resistor and one end of the second capacitor are connected with the first end of the secondary side of the first transformer, the other end of the fourth resistor is connected with one end of the fifth resistor, the other end of the second capacitor, the first end of the third capacitor and the first IO end of the first controller, and the other end of the fifth resistor and the other end of the third capacitor are grounded.
4. The electric leakage detection device of the power switch cabinet according to claim 3, wherein the power module comprises a first optical coupler, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a first key switch, a first power tube, a direct current power supply and a multi-path voltage stabilizing device;
the first end of the first optical coupler is connected with the fourth IO end of the first controller, the second end of the first optical coupler is grounded, the third end of the first optical coupler is connected with the first end of the direct-current power supply through an eighteenth resistor, the fourth end of the first optical coupler is connected with one end of a first key switch, the grid electrode of the first power tube and one end of a twentieth resistor, the other end of the twentieth resistor is grounded, the other end of the first key switch is connected with the second end of the direct-current power supply through a nineteenth resistor and the drain electrode of the first power tube, and the source electrode of the first power tube is connected with the input end of the multi-path voltage stabilizing device.
5. The power switch cabinet leakage detection device of claim 4, wherein the leakage detection module comprises an ultrasonic sensor; the amplifying and filtering module comprises a band-pass filtering device, a sixth resistor, a first operational amplifier and a seventh resistor;
the ultrasonic sensor is connected with the input end of the band-pass filter device, the output end of the band-pass filter device is connected with the inverting end of the first operational amplifier through a sixth resistor, the inverting end of the first operational amplifier is grounded through a seventh resistor, and the output end of the first operational amplifier is connected with the analog compensation module and the differential amplification module.
6. The power switch cabinet leakage detection device according to claim 5, wherein the analog compensation module comprises a fourth capacitor, a fourteenth resistor, a fifteenth resistor, a first voltage regulator tube, a sixteenth resistor, a second controller, and a seventeenth resistor;
one end of the fifteenth resistor, one end of the fourteenth resistor and one end of the fourth capacitor are all connected with the inverting end of the first operational amplifier, the other end of the fourteenth resistor is connected with the other end of the fourth capacitor, the second end of the second controller, the first end of the seventeenth resistor and the output end of the first operational amplifier, the second end of the seventeenth resistor is connected with the differential amplification module, the ninth end of the second controller is connected with the cathode of the first voltage regulator tube, one end of the sixteenth resistor and the third IO end of the first controller, the anode of the first voltage regulator tube, the other end of the sixteenth resistor, the seventh end, the eighth end, the third end and the fourth end of the second controller are all grounded, and the tenth end and the fifth end of the second controller are all connected with the output end of the multi-path voltage regulator.
7. The electric power switch cabinet leakage detection device according to claim 6, wherein the differential amplification module comprises a first amplifier, a ninth resistor, an eighth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a thirteenth resistor; the intelligent control module also comprises an analog-to-digital converter;
one end of the ninth resistor is connected with the output end of the first operational amplifier and the first end of the seventeenth resistor, the other end of the ninth resistor is connected with the eighth end of the first amplifier and one end of the tenth resistor, the other end of the tenth resistor is connected with the fifth end of the first amplifier, one end of the twelfth resistor and the second end of the seventeenth resistor, the second end of the first amplifier is grounded, the first end of the first amplifier is connected with one end of the eleventh resistor and grounded through the eighth resistor, the fourth end of the first amplifier is connected with the other end of the eleventh resistor and connected with the first input end of the analog-to-digital converter through the thirteenth resistor, the other end of the twelfth resistor is connected with the second input end of the analog-to-digital converter, the output end of the analog-to-digital converter is connected with the fifth IO end of the first controller, and the third end and the sixth end of the first amplifier are connected with the output end of the multi-path voltage stabilizing device.
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Cited By (1)
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| CN116774101A (en) * | 2023-08-21 | 2023-09-19 | 保定传能电子科技有限公司 | Low-voltage line leakage current detection device |
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| CN102520324A (en) * | 2011-12-27 | 2012-06-27 | 镇江市诚翔电器有限责任公司 | On-line insulation monitoring system for intelligent medium voltage switchgear and monitoring method of system |
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