CN112305390A - Local discharge fault diagnosis circuit of high-voltage switch cabinet - Google Patents
Local discharge fault diagnosis circuit of high-voltage switch cabinet Download PDFInfo
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- CN112305390A CN112305390A CN202011416507.7A CN202011416507A CN112305390A CN 112305390 A CN112305390 A CN 112305390A CN 202011416507 A CN202011416507 A CN 202011416507A CN 112305390 A CN112305390 A CN 112305390A
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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
- G01R31/1209—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 using acoustic measurements
Abstract
The invention relates to a local discharge fault diagnosis circuit of a high-voltage switch cabinet, wherein a signal conditioning circuit receives a local discharge signal and an electric field collecting signal of the high-voltage switch cabinet detected by an ultrasonic sensor, the local discharge signal and the electric field collecting signal are rectified and filtered, then the local discharge signal and the electric field collecting signal are subjected to mean value filtering by a full-wave rectifier and a mean value filter and then output to a fault diagnosis circuit to serve as a power supply of a trigger circuit, when stronger local discharge occurs, the trigger circuit is conducted, a triode Q3 is conducted, one path enables an output signal after integration to be connected, the conduction angle of a unijunction transistor T2 is changed, the timeliness and accuracy of power failure protection of a later stage circuit are ensured, a thyristor VTL2 is triggered to be conducted, the discharge protection of the high-voltage switch with stronger local discharge is realized, when the other path has strong local discharge, a relay K1 coil is electrified, the power failure protection of, The charge pump boosts the voltage, one path of the boosted signal is fed back to the signal conditioning circuit, and the other path of the boosted signal is output after being integrated by the integrator.
Description
Technical Field
The invention relates to the technical field of high-voltage switch cabinets, in particular to a local discharge fault diagnosis circuit of a high-voltage switch cabinet.
Background
The high-voltage switch cabinet is a switch device which is extremely wide in use and most in quantity, the operation state of the high-voltage switch cabinet has great influence on the power supply reliability of a power system, partial discharge is a common fault which endangers the safe operation of the high-voltage switch cabinet, and in order to guarantee the economical and reliable operation of the high-voltage switch cabinet, the accuracy and timeliness of the diagnosis of the partial discharge fault of the high-voltage switch cabinet are required to be guaranteed.
At present, ultrasonic partial discharge detection is generally adopted, when abnormal signals (suspected defects, some intermittent and unstable abnormal signals) are detected, the abnormal signals are further analyzed and confirmed by different detection modes such as transient voltage to earth, infrared temperature measurement, analyte analysis, X-ray and the like to determine whether obvious defects exist, although the false alarm rate can be reduced to a certain degree and the accuracy is improved, the cost is high, the time delay of information processing can be caused, and particularly when partial discharge is strong, accidents can be caused because the protective measures cannot be taken in time.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention aims to provide a local discharge fault diagnosis circuit for a high-voltage switch cabinet, which effectively solves the problem that the information processing of the fault diagnosis method in the prior art is not timely.
The technical scheme includes that the signal conditioning circuit receives a partial discharge signal and an electric field collecting signal of a high-voltage switch cabinet detected by an ultrasonic sensor, the partial discharge signal and the electric field collecting signal are rectified and filtered, then the partial discharge signal and the electric field collecting signal are output after mean value filtering of a full-wave rectifier and a mean value filter, the energy collecting discharge circuit receives the electric field collecting signal during partial discharge of the high-voltage switch cabinet, the electric field collecting signal drives a composite tube Q1 and a Q2 to be conducted and a thyristor VTL3 to be conducted during slight partial discharge after energy storage, a charge pump is controlled to be boosted, the boosted signal is fed back to the signal conditioning circuit through one path of the composite tube Q2, the other path of the signal is output after integration of an integrator, the boosted signal is discharged through a voltage stabilizing tube Z1 or VTL2, the fault diagnosis circuit adopts the output signal after mean value filtering as a power supply of a trigger circuit with a single-junction transistor T2, one path of trigger thyristor VTL1 is conducted, an output signal is added to a trigger circuit after integration, the conduction angle of a unijunction transistor T2 is changed, the trigger conduction is achieved by the common action of the trigger thyristor VTL2 and the local discharge signal, the strong local discharge high-voltage switch discharge protection is achieved, the other path of trigger thyristor VTL2 is added to the base electrode of the triode Q4 through the voltage stabilizing tube Z3, when the strong local discharge occurs, the triode Q4 is conducted, the coil of the relay K1 is electrified, and the power failure protection of the strong local discharge high-voltage switch cabinet is achieved.
The invention has the beneficial effects that: the structure is simple, the processing is timely, when slight partial discharge occurs, the electric field collecting signal boosted by the energy storage and charge pump compensates the partial discharge signal of the high-voltage switch cabinet detected by the ultrasonic sensor, the partial discharge signal is rectified and filtered, then the average value of the partial discharge signal is filtered by the full-wave rectifier and the average value filter, the average value of the partial discharge signal is calculated and output as the power supply of the trigger circuit, the electric field collecting signal boosted by the charge pump is integrated by the integrator, the change rate of the electric field collecting signal with a certain time length is output, when stronger partial discharge occurs, the trigger circuit is conducted, further the triode Q3 is triggered to be conducted, one way is conducted by the high-voltage trigger circuit triggering thyristor VTL1, the output signal after integration is added to the trigger circuit, the conduction angle of the unijunction transistor T2 is changed, when the partial discharge occurs, the triggering conduction is accelerated, otherwise, the triggering conduction is, the timeliness and the accuracy of power failure protection of a rear-stage circuit are ensured, the thyristor VTL2 is triggered to be conducted through the high-voltage trigger circuit and the voltage regulator tube Z4, the discharge protection of the high-voltage switch cabinet with stronger partial discharge is realized, the other path of power failure protection is filtered, the direct-current voltage exceeds the voltage stabilizing value of the voltage regulator tube Z3, namely, during the stronger partial discharge, the triode Q4 is conducted, the coil of the relay K1 is electrified, and the power failure protection of the high-voltage switch cabinet with stronger partial discharge is realized.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1. 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.
The embodiment I is characterized in that the high-voltage switch cabinet partial discharge fault diagnosis circuit comprises a signal conditioning circuit, a fault diagnosis circuit and an energy-accumulating discharge circuit, wherein the signal conditioning circuit receives a high-voltage switch cabinet partial discharge signal and an electric field collecting signal detected by an ultrasonic sensor, the signals are rectified and filtered, then the signals are subjected to average filtering by a full-wave rectifier and an average filter, the average value of the partial discharge signal is calculated and output, so that the stability of the signal is improved, and the misoperation of a rear-stage circuit caused by instantaneous and accidental abnormity is avoided, the energy-accumulating discharge circuit receives the electric field collecting signal when the high-voltage switch cabinet is subjected to partial discharge, the signals are subjected to energy storage, when slight partial discharge occurs, a composite tube Q1 and a Q2 are driven to be conducted, a thyristor VTL3 is conducted, a charge pump is controlled to be boosted, the boosted signal is fed back to the signal conditioning circuit through a composite tube Q36, when the detected partial discharge signal is very small, the signal is ignored and is not compensated, the other path of the signal is output after being integrated by an integrator consisting of an operational amplifier AR1, a resistor R13 and a capacitor C6, namely, the change rate of an electric field collecting signal with a certain time length is output, the signal after being boosted exceeds the voltage stabilizing value of a voltage stabilizing tube Z1 (when slight partial discharge is accumulated to a certain intensity) or when a thyristor VTL2 is conducted and is also strongly partial discharge, the high-voltage switch discharge protection of the strong partial discharge is realized by discharging through a capacitor C5, the fault diagnosis circuit adopts an output signal after mean filtering as a power supply of a unijunction transistor T2, a resistor R8, a resistor R16-resistor R18, a resistor R20, a serially connected varactor DC1, a capacitor C8 and a voltage stabilizing tube Z2, when the strong partial discharge occurs, the trigger circuit is conducted, and further triggers the conduction of a triode Q3, one path is conducted through a high-voltage trigger circuit to trigger a thyristor VTL1, an output signal after integration is added to a trigger circuit, the conduction angle of a unijunction transistor T2 is changed, the unijunction transistor T2 is triggered and conducted under the combined action with a partial discharge signal, namely when partial discharge is stronger and stronger, the triggering and conducting are accelerated, otherwise, the triggering and conducting are delayed or are not triggered and conducted when the partial discharge is accidental, so that a definite trigger signal is provided, the timeliness and the accuracy of power failure protection of a rear-stage circuit are ensured, the thyristor VTL2 is triggered and conducted through a high-voltage trigger circuit and a voltage stabilizing tube Z4, the other path is filtered through an inductor L1 and a capacitor C5, direct-current voltage exceeds the voltage stabilizing value of a voltage stabilizing tube Z3, namely when the partial discharge signal is stronger (the partial discharge signal is more than 45 dB), a triode Q4 is conducted, a coil of a relay K1 is electrified.
In the second embodiment, on the basis of the first embodiment, the fault diagnosis circuit uses an output signal after mean filtering as a power supply for a trigger circuit composed of a single junction transistor T2, a resistor R8, a resistor R16-a resistor R18, a resistor R20, a varactor diode DC1 connected in series, a capacitor C8, and a voltage regulator tube Z2, and when a strong partial discharge occurs (i.e., the partial discharge signal is greater than 30dB and less than or equal to 40 dB), the trigger circuit is turned on to trigger the conduction of the triode Q3, one path of the high-voltage trigger circuit composed of a resistor R15, a capacitor C7, and a bidirectional diode BD2 triggers the conduction of a thyristor VTL1, so that the integrated output signal is applied to the trigger circuit to change the conduction angle of the single junction transistor T2, to trigger conduction together with the partial discharge signal, i.e., when the partial discharge becomes stronger, conduction is accelerated, otherwise, the trigger conduction is delayed or the partial discharge is not triggered accidentally, the high-voltage switch cabinet power failure protection circuit comprises a resistor R8, a resistor R16, a resistor R8, one end of the resistor R8, one end of the resistor R16 and one end of the resistor R8 which are connected with the output end of an operational amplifier AR3, the other end of the resistor R8 is respectively connected with the emitter of a single junction transistor T1 and the anode of a diode DC1, the cathode of the diode DC1 is respectively connected with the ground capacitor C8, the high-voltage trigger circuit is connected with the thyristor VTL2 through a high-voltage trigger circuit and a voltage regulator tube Z4 to realize the discharge protection of the high-voltage switch cabinet with stronger partial discharge, the other circuit is filtered by an inductor L1 and a capacitor C1, the direct-current voltage exceeds the voltage stabilizing value of the voltage regulator tube Z3, namely when the local discharge signal is stronger (the local discharge signal is more than 45 dB), the triode Q4 is connected and the relay K1 coil is electrified to realize the power failure protection of the high-voltage switch cabinet with stronger partial discharge protection, and the power failure protection of the high, The cathode of the thyristor VTL1, the second base of the unijunction transistor T1 is connected with the other end of the resistor R16, the first base of the unijunction transistor T1 is respectively connected with one end of a grounding resistor R17, the cathode of a voltage regulator tube Z2 and the base of a triode Q3, the anode of the voltage regulator tube Z2 is connected with the ground, the collector of the triode Q3 is connected with the other end of the resistor R18, the emitter of the triode Q3 is respectively connected with one end of the resistor R20, one end of an inductor L1, one end of the resistor R1 and one end of a grounding capacitor C1, the other end of the resistor R1 is connected with the right end of a bidirectional diode BD1, the left end of the bidirectional diode BD1 is respectively connected with the control electrode of the thyristor VTL1 and the cathode of the voltage regulator tube Z1, the anode of the voltage regulator tube Z1 is connected with the control electrode of the thyristor VTL1, the other end of the inductor L1 is respectively connected with one end of the emitter of the grounding capacitor C1 and the emitter of the triode Q1, the triode Q1, the collector of the triode Q4 is respectively connected with one end of the coil of the relay K1 and the anode of the diode D5, and the other end of the coil of the relay K1 and the cathode of the diode D5 are connected with +48V of a power supply.
In a third embodiment, on the basis of the first embodiment, the energy-collecting discharge circuit receives an electric field collection signal during partial discharge of the high-voltage switch cabinet, stores energy through an energy storage circuit composed of a resistor R9, a MOS transistor T1 and an inductor L1, when slight partial discharge occurs (a partial discharge signal is 3-10 dB), one path drives the composite tubes Q1 and Q2 to be conducted, the other path triggers the thyristor VTL3 to be conducted and controls the charge pump to be boosted through a high-voltage trigger circuit composed of a resistor R12, a capacitor C3 and a bidirectional diode BD1, the specific control diodes D6 and D7 and the charge pump circuit composed of capacitors C9 and C10 are boosted, the boosted signal is fed back to the signal conditioning circuit through one path of the composite tube Q2, the compensation is performed such that the detected partial discharge signal is reduced due to electric field collection, the detected partial discharge signal is very small, the signal is ignored and is not compensated, the other path is integrated and output through an integrator composed of an operational amplifier AR 34, a resistor R13 and a capacitor C, that is, the change rate of the electric field collected signal is output for a certain period of time, the boosted signal exceeds the regulated voltage value of the voltage regulator tube Z1 (when slight partial discharge is accumulated to a certain intensity), or when the thyristor VTL2 is turned on and is also in strong partial discharge, the discharge is performed through the capacitor C5, the discharge protection of the high-voltage switch cabinet is realized when slight partial discharge is accumulated to a certain intensity or in strong partial discharge, unnecessary power failure is reduced, the high-voltage switch cabinet comprises a resistor R9, one end of the resistor R9 receives the electric field collected signal in the partial discharge of the high-voltage switch cabinet, the other end of the resistor R9 is connected with the gate of the MOS tube T1, the source of the MOS tube T1 is connected to ground, the drain of the MOS tube T1 is respectively connected with one end of the inductor L2 and the anode of the diode D6, the other end of the inductor L2 is connected with the power supply +2.5V, the cathode of the diode D6 is respectively connected with one end of the capacitor, The anode of a thyristor VTL2, the collector of a triode Q2 and the cathode of a voltage regulator Z1, the other end of a capacitor C9 is respectively connected with the other end of a capacitor C10 and the anode of a thyristor VTL3, the cathode of the thyristor VTL3 is connected with the ground, the control pole of a thyristor VTL3 is connected with the right end of a bidirectional diode 1, the left end of the bidirectional diode BD1 is connected with one end of a resistor R12, the other end of the resistor R12 is respectively connected with one end of a grounded capacitor C3 and the cathode of a diode D1, the cathode of a thyristor VTL3 is respectively connected with the anode of a voltage regulator Z1 and one end of a capacitor BD 5, the other end of the capacitor C5 and one end of a capacitor C4 are connected with the ground, the other end of a capacitor C4 is connected with the ground, the base of a triode Q2 is connected with the collector of a triode Q11 through a resistor R11, the base of the triode Q11 is connected with a power supply +1.5, an emitter of the triode Q2 is connected to one end of a resistor R14, one end of a resistor R13, one end of a capacitor C6 and an inverting input end of an operational amplifier AR1 respectively, the other end of the resistor R14 is connected to the anode of a diode D2, a non-inverting input end of the operational amplifier AR1 is connected to ground, and an output end of the operational amplifier AR1 is connected to the other end of a resistor R13, the other end of the capacitor C6 and the anode of a thyristor VTL1 respectively.
In a fourth embodiment, on the basis of the first embodiment, the signal conditioning circuit receives a partial discharge signal and an electric field collection signal of the high-voltage switch cabinet detected by the ultrasonic sensor (in the operation of the high-voltage switch cabinet, due to manufacturing process defects of an insulating material, uneven dielectric distribution and uneven electric field distribution, partial discharge occurs in an electric field concentration area, and an electric field energy collector is used for collecting the partial discharge, so that on one hand, the damage to an electric element caused by the partial discharge in a non-electric field concentration area of the high-voltage switch cabinet is reduced, and on the other hand, when the collected electric field energy reaches a certain degree, a discharge channel is provided), after being rectified by the diode D1 and filtered by the capacitor C2, the partial discharge signal is rectified by the operational amplifier AR2, the electrolytic capacitor E2, the resistor R12-resistor R4, the diodes D3 and D4, and a full-wave rectifier rectification is formed by the operational amplifier AR3, the resistor R63, the device comprises a resistor R21, wherein one end of the resistor R21 is connected with a local discharge signal of a high-voltage switch cabinet detected by an ultrasonic sensor, the other end of the resistor R21 is respectively connected with the anode of a diode D1 and the cathode of a diode D2, the cathode of a diode D1 is respectively connected with one end of a grounding capacitor C2 and the anode of an electrolytic capacitor E2, the cathode of the electrolytic capacitor E2 is respectively connected with one end of a resistor R1 and one end of a resistor R2, the other end of the resistor R2 is respectively connected with the inverting input end of an operational amplifier AR2, one end of a resistor R3 and the cathode of a diode D3, the non-inverting input end of the operational amplifier AR2 is connected with the ground through a resistor R4, the output end of the operational amplifier AR2 is respectively connected with the anode of a diode D3 and the cathode of a diode D4, the anode of a diode D4 is connected with the other end of a resistor R3, One end of the resistor R5 and the other end of the resistor R5 are respectively connected with the inverting input end of the operational amplifier AR3, the other end of the resistor R1, one end of the resistor R6 and the anode of the electrolytic capacitor E3, the non-inverting input end of the operational amplifier AR3 is connected with the ground through the resistor R7, and the output end of the operational amplifier AR3, the other end of the resistor R6 and the cathode of the electrolytic capacitor E3 are output signals of the signal conditioning circuit.
When the invention is used, a signal conditioning circuit receives a partial discharge signal and an electric field collecting signal of a high-voltage switch cabinet detected by an ultrasonic sensor, the partial discharge signal and the electric field collecting signal are rectified and filtered, then the partial discharge signal is subjected to mean value filtering by a full-wave rectifier and a mean value filter, the mean value of the partial discharge signal is calculated and then output, so that the stability of the signal is improved, the false operation of a rear-stage circuit caused by instantaneous and accidental abnormality is avoided, then the signal enters a fault diagnosis circuit to be used as a power supply of a trigger circuit consisting of a unijunction transistor T2, a resistor R8, a resistor R16-a resistor R18, a resistor R20, a varactor diode DC1, a capacitor C8 and a voltage stabilizing tube Z2, the trigger circuit is conducted when strong partial discharge is carried out, and further a triode Q3 is triggered to be conducted, one way of the trigger circuit is conducted through a high-voltage trigger circuit consisting of a resistor R15, the conduction angle of a unijunction transistor T2 is changed, the unijunction transistor T2 is triggered and conducted under the combined action with a local discharge signal, namely when the local discharge is stronger and stronger, the triggering and conducting are accelerated, otherwise, the triggering and conducting are delayed or the local discharge is not triggered and conducted when the local discharge is accidental, so as to provide a definite trigger signal, the timeliness and the accuracy of the power failure protection of a rear-stage circuit are ensured, a thyristor VTL2 is triggered and conducted through a high-voltage trigger circuit and a voltage regulator tube Z4, the discharge protection of a high-voltage switch cabinet with stronger local discharge is realized, the unnecessary power failure frequency is reduced, the other circuit is filtered through an inductor L1 and a capacitor C1, the direct current voltage exceeds the voltage stabilizing value of a voltage regulator tube Z3, namely the stronger local discharge is realized, a triode Q4 is conducted, a coil of a relay K1 is electrified, the power failure protection of the high-voltage switch cabinet, the energy is stored by an energy storage circuit, when slight partial discharge (partial discharge signal is 3-10 dB), one path drives a composite tube Q1 and a Q2 to be conducted, the other path triggers a thyristor VTL3 to be conducted to control a charge pump to be boosted by a high-voltage trigger circuit consisting of a resistor R12, a capacitor C3 and a bidirectional diode BD1, the boosted signal is fed back to a signal conditioning circuit through one path of the composite tube Q2, the detected partial discharge signal is reduced due to electric field collection, when the detected partial discharge signal is very small, the signal is ignored and not compensated, the other path is output after being integrated by an integrator, namely, the change rate of the electric field collection signal with a certain time length is output, the boosted signal exceeds the voltage stabilization value of a voltage stabilizing tube Z1, or when the thyristor VTL2 is conducted, namely stronger partial discharge, the discharge is carried out by the capacitor C5, and the discharge protection of the high-voltage switch cabinet when slight partial discharge is accumulated to a certain intensity or, unnecessary power failure is reduced.
Claims (4)
1. The local discharge fault diagnosis circuit of the high-voltage switch cabinet comprises a signal conditioning circuit, an energy-collecting discharge circuit and a fault diagnosis circuit, and is characterized in that the signal conditioning circuit receives a local discharge signal and an electric field collecting signal of the high-voltage switch cabinet detected by an ultrasonic sensor, the signals are rectified and filtered and then output after being subjected to mean value filtering by a full-wave rectifier and a mean value filter, the energy-collecting discharge circuit receives the electric field collecting signal when the high-voltage switch cabinet is subjected to local discharge, the signals are subjected to energy storage and are subjected to slight local discharge, composite tubes Q1 and Q2 are driven to be conducted, a thyristor VTL3 is controlled to be conducted, a charge pump is controlled to boost, the boosted signal is fed back to the signal conditioning circuit through one path of the composite tubes Q2, the other path is subjected to integration by an integrator and is output, the boosted signal is discharged through a voltage stabilizing tube Z1 or a thyristor VTL2, the fault diagnosis circuit adopts the output signal after mean value, when strong partial discharge occurs, the trigger circuit is conducted, the triode Q3 is conducted, one path of the trigger thyristor VTL1 is conducted, an output signal is added to the trigger circuit after integration, the conduction angle of the unijunction transistor T2 is changed, the trigger thyristor VTL2 is conducted to achieve the purpose of triggering conduction with the partial discharge signal, the other path of the trigger thyristor is added to the base electrode of the triode Q4 through the voltage stabilizing tube Z3, when strong partial discharge occurs, the triode Q4 is conducted, the coil of the relay K1 is electrified, and power failure protection of the high-voltage switch cabinet with strong partial discharge is achieved.
2. The local discharge fault diagnosis circuit of the high-voltage switch cabinet as claimed in claim 1, wherein the fault diagnosis circuit comprises a resistor R8, a resistor R16 and a resistor R8, one end of the resistor R8, one end of the resistor R16 and one end of the resistor R8 are connected to the output end of the operational amplifier AR3, the other end of the resistor R8 is connected to the emitter of the unijunction transistor T1 and the anode of the varactor DC1, the cathode of the varactor DC1 is connected to one end of the grounding capacitor C8 and the cathode of the thyristor VTL1, the second base of the unijunction transistor T1 is connected to the other end of the resistor R16, the first base of the unijunction transistor T1 is connected to one end of the grounding resistor R17, the cathode of the regulator Z2 and the base of the transistor Q3, the anode of the regulator Z2 is connected to ground, the collector of the transistor Q3 is connected to the other end of the resistor R18, and the emitter of the transistor Q3 is connected to one end of the resistor R20, One end of an inductor L1, one end of a resistor R15 and one end of a grounded capacitor C7, the other end of the resistor R15 is connected with the right end of a bidirectional diode BD2, the left end of the bidirectional diode BD2 is respectively connected with a control electrode of a thyristor VTL1 and a negative electrode of a voltage regulator tube Z4, the positive electrode of the voltage regulator tube Z4 is connected with a control electrode of the thyristor VTL2, the other end of the inductor L1 is respectively connected with one end of a grounded capacitor C11 and the negative electrode of a voltage regulator tube Z3, the positive electrode of the voltage regulator tube Z3 is connected with the base electrode of a triode Q4, the emitter of the triode Q4 is connected with the ground through a resistor R22, the collector of a triode Q4 is respectively connected with one end of a coil of a relay K1 and the positive electrode of a diode D5, and the other end.
3. The local discharge fault diagnosis circuit of the high-voltage switch cabinet according to claim 1, wherein the energy-collecting discharge circuit comprises a resistor R9, one end of the resistor R9 receives an electric field collecting signal when the high-voltage switch cabinet is in local discharge, the other end of the resistor R9 is connected with the gate of a MOS tube T1, the source of the MOS tube T1 is connected with the ground, the drain of the MOS tube T1 is connected with one end of an inductor L2 and the anode of a diode D6 respectively, the other end of the inductor L2 is connected with +2.5V, the cathode of a diode D6 is connected with one end of a capacitor C10 and the anode of a diode D7 respectively, the cathode of a diode D7 is connected with one end of a capacitor C9, the anode of a thyristor VTL2, the collector of a triode Q2 and the cathode of a voltage regulator Z5 respectively, the other end of a capacitor C5857323 is connected with the anode of a capacitor C10 and the cathode of a thyristor VTL3, the cathode of a thyristor BD 9 is connected with the right end of a diode BD 63, the left end of a bidirectional diode BD1 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with one end of a grounded capacitor C3 and the negative electrode of a diode D1 respectively, the cathode of a thyristor VTL3 is connected with the anode of a voltage regulator Z1 and one end of a capacitor C5 respectively, the other end of the capacitor C5 and one end of a capacitor C4 are connected with the ground, the other end of a capacitor C4 is connected with the ground, the base of a triode Q2 is connected with the collector of a triode Q1 through a resistor R11, the base of the triode Q1 is connected with +1.5V of a power supply through a resistor R10, the emitter of a triode Q1 is connected with a local discharge signal of a high-voltage switch cabinet detected by an ultrasonic sensor, the emitter of a triode Q2 is connected with one end of a resistor R14, one end of the capacitor C14 and the inverting input end of an operational amplifier AR 14, the other end of the resistor R14 is connected with the anode of the operational amplifier AR, The other end of the capacitor C6, and the anode of the thyristor VTL 1.
4. The local discharge fault diagnosis circuit of the high-voltage switch cabinet according to claim 1, wherein the signal conditioning circuit comprises a resistor R21, one end of the resistor R21 is connected to the local discharge signal of the high-voltage switch cabinet detected by the ultrasonic sensor, the other end of the resistor R21 is connected to the anode of the diode D1 and the cathode of the diode D2, the cathode of the diode D1 is connected to one end of the grounding capacitor C2 and the anode of the electrolytic capacitor E2, the cathode of the electrolytic capacitor E2 is connected to one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R2 is connected to the inverting input terminal of the operational amplifier AR2, one end of the resistor R3 and the cathode of the diode D3, the non-inverting input terminal of the operational amplifier AR2 is connected to ground through the resistor R4, the output terminal of the operational amplifier AR2 is connected to the anode of the diode D3 and the cathode of the diode D4, and the anode of the diode D4 is connected, One end of the resistor R5 and the other end of the resistor R5 are respectively connected with the inverting input end of the operational amplifier AR3, the other end of the resistor R1, one end of the resistor R6 and the anode of the electrolytic capacitor E3, the non-inverting input end of the operational amplifier AR3 is connected with the ground through the resistor R7, and the output end of the operational amplifier AR3, the other end of the resistor R6 and the cathode of the electrolytic capacitor E3 are output signals of the signal conditioning circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011416507.7A CN112305390A (en) | 2020-12-07 | 2020-12-07 | Local discharge fault diagnosis circuit of high-voltage switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011416507.7A CN112305390A (en) | 2020-12-07 | 2020-12-07 | Local discharge fault diagnosis circuit of high-voltage switch cabinet |
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| CN112305390A true CN112305390A (en) | 2021-02-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946350A (en) * | 2021-03-02 | 2021-06-11 | 台山核电合营有限公司 | Single-phase voltage stability monitoring alarm circuit and device |
| CN114062920A (en) * | 2021-11-30 | 2022-02-18 | 河南职业技术学院 | Internet of things detection circuit for power switch cabinet |
-
2020
- 2020-12-07 CN CN202011416507.7A patent/CN112305390A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946350A (en) * | 2021-03-02 | 2021-06-11 | 台山核电合营有限公司 | Single-phase voltage stability monitoring alarm circuit and device |
| CN114062920A (en) * | 2021-11-30 | 2022-02-18 | 河南职业技术学院 | Internet of things detection circuit for power switch cabinet |
| CN114062920B (en) * | 2021-11-30 | 2023-07-14 | 河南职业技术学院 | Internet of things detection circuit for power switch cabinet |
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Application publication date: 20210202 |