CN116626533B - Intelligent detection circuit for electric leakage of power switch cabinet - Google Patents
Intelligent detection circuit for electric leakage of power switch cabinet Download PDFInfo
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- CN116626533B CN116626533B CN202310889659.6A CN202310889659A CN116626533B CN 116626533 B CN116626533 B CN 116626533B CN 202310889659 A CN202310889659 A CN 202310889659A CN 116626533 B CN116626533 B CN 116626533B
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- 238000001514 detection method Methods 0.000 title claims abstract description 100
- 230000001934 delay Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 44
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 33
- 229910052710 silicon Inorganic materials 0.000 claims description 33
- 239000010703 silicon Substances 0.000 claims description 33
- 230000005611 electricity Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012790 confirmation Methods 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 208000025274 Lightning injury Diseases 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an intelligent detection circuit for electric leakage of a power switch cabinet, which relates to the field of electric leakage detection, and comprises: the instantaneous driving module is used for supplying power to the control and alarm module after receiving the voltage; the detection driving module is used for supplying power to the control and alarm module after continuously receiving the voltage; the delay grounding module is used for forming a loop by the instant driving module and the circuit cathode after delay; the beneficial effects of the invention are as follows: the invention is provided with the instant driving module, and when detecting that the magnitude of the leakage exceeds the amplitude, the instant driving module supplies power to the control and alarm module for protection treatment; during the protection process, the detection driving module continuously detects whether electric leakage exists or not, and after confirmation, the control and alarm module is also powered to take over protection; after the instantaneous driving module works, the delay grounding module delays to output the signal to the control and alarm module for voltage grounding, so that instantaneous protection is avoided, namely electric leakage misjudgment is avoided.
Description
Technical Field
The invention relates to the field of leakage detection, in particular to an intelligent leakage detection circuit for a power switch cabinet.
Background
In power systems, switch cabinets are widely used. In the operation process of the switch cabinet, if the electric field intensity of a certain area reaches the breakdown intensity, a discharge phenomenon occurs in the area, the severe discharge area reaches the breakdown intensity, faults are caused, and large economic loss can be caused for a power system.
The existing switch cabinet is generally provided with a leakage detection device for detecting whether leakage exists, and the defect is that due to environmental factors (such as lightning stroke, earthquake and other natural factors), electromagnetic interference (changing the current of a power supply line) and other reasons, misjudgment of leakage can be caused, power distribution is affected, and improvement is needed.
Disclosure of Invention
The invention aims to provide an intelligent detection circuit for electric leakage of a power switch cabinet, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an intelligent detection circuit for leakage of a power switch cabinet, comprising:
the switch cabinet power distribution module is used for distributing power for the subordinate equipment;
the leakage detection module is used for detecting whether the distribution line of the switch cabinet leaks electricity or not, acquiring leakage voltage during leakage and outputting the leakage voltage to the leakage amplitude detection module;
the leakage amplitude detection module is used for detecting whether the leakage voltage exceeds a threshold value, and outputting the voltage for the instant driving module and the detection driving module when the leakage voltage exceeds the threshold value;
the instantaneous driving module is used for supplying power to the control and alarm module after receiving the voltage;
the detection driving module is used for supplying power to the control and alarm module after continuously receiving the voltage;
the delay grounding module is used for forming a loop by the instant driving module and the circuit cathode after the instant driving module receives the voltage and delays;
the control and alarm module is used for controlling the switch cabinet power distribution module to change the power distribution condition after receiving the voltage of the instant driving module or the detection driving module, and giving an alarm and prompting at the same time;
the output of switch cabinet distribution module connects the input of electric leakage detection module, and electric leakage detection module's output connects electric leakage amplitude detection module's input, detection drive module's input in the twinkling of an eye is connected to electric leakage amplitude detection module's output, and delay grounding module's input is connected to instant drive module's first output, and control and alarm module's input is connected to instant drive module's second output, and control and alarm module's input is connected to detection drive module's output, and switch cabinet distribution module is connected to control and alarm module's output.
As still further aspects of the invention: the switch cabinet power distribution module comprises a first live wire, a second live wire, a first zero line, a second zero line, a first switch, a second switch, a first interface, a second interface, a third interface and a fourth interface, wherein the first switch and the second switch are double-pole double-throw switches, the first live wire is connected with one end of the first interface, the first zero line is connected with one end of the second interface, the second live wire is connected with one end of the third interface, the second zero line is connected with one end of the fourth interface, one end of the first switch is connected with the first interface or the third interface, one end of the second switch is connected with the second interface or the fourth interface, the other end of the first switch is connected with lower-level equipment, and the other end of the second switch is connected with lower-level equipment.
As still further aspects of the invention: the leakage detection module comprises a transformer, a first diode, a first capacitor, a first resistor and a first potentiometer, wherein one end of the transformer is connected with the positive electrode of the first diode, the other end of the transformer is grounded, the negative electrode of the first diode is connected with one end of the first capacitor and one end of the first resistor, the other end of the first capacitor is grounded, the other end of the first resistor is connected with one end of the first potentiometer, the other end of the first potentiometer is grounded, and the sliding end of the first potentiometer is connected with the leakage amplitude detection module.
As still further aspects of the invention: the leakage amplitude detection module comprises a first amplifier, a second resistor, a second diode and a second capacitor, wherein the in-phase end of the first amplifier is connected with the output end of the leakage detection module, the inverting end of the first amplifier is connected with one end of the second resistor, the cathode of the second diode and one end of the second capacitor, the anode of the second diode is grounded, the other end of the second capacitor is grounded, and the other end of the second resistor is connected with a supply voltage.
As still further aspects of the invention: the instantaneous driving module comprises a first silicon controlled rectifier and a fourth diode, wherein the positive electrode of the first silicon controlled rectifier is connected with the power supply voltage, the reference electrode of the first silicon controlled rectifier is connected with the output end of the leakage amplitude detection module, the negative electrode of the first silicon controlled rectifier is connected with the positive electrode of the fourth diode and the input end of the delay grounding module, and the negative electrode of the fourth diode is connected with the input end of the control and alarm module.
As still further aspects of the invention: the detection driving module comprises a third diode, a third resistor, a second potentiometer, a third capacitor, a first MOS tube, a third silicon controlled rectifier and a fifth diode, wherein the positive electrode of the third diode is connected with the output end of the leakage amplitude detection module, the negative electrode of the third diode is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the second potentiometer, the other end of the second potentiometer is connected with one end of the third capacitor, the G electrode of the first MOS tube is grounded, the D electrode of the first MOS tube is connected with the power supply voltage and the positive electrode of the third silicon controlled rectifier, the S electrode of the first MOS tube is connected with the control electrode of the third silicon controlled rectifier, the negative electrode of the third silicon controlled rectifier is connected with the positive electrode of the fifth diode, and the negative electrode of the fifth diode is connected with the input end of the control and alarm module.
As still further aspects of the invention: the delay grounding module comprises a fourth resistor, a fourth capacitor, a second MOS tube and a second silicon controlled rectifier, wherein one end of the fourth resistor is connected with the anode of the second silicon controlled rectifier, the D electrode of the second MOS tube and the first output end of the instant driving module, the other end of the fourth resistor is connected with one end of the fourth capacitor and the G electrode of the second MOS tube, the other end of the fourth capacitor is grounded, the S electrode of the second MOS tube is connected with the control electrode of the second silicon controlled rectifier, and the negative electrode of the second silicon controlled rectifier is grounded.
As still further aspects of the invention: the control and alarm module comprises a relay, a sixth diode and a loudspeaker, wherein one end of the relay is connected with the cathode of the sixth diode, the second output end of the instant driving module and the output end of the detection driving module, the other end of the relay is connected with the anode of the sixth diode and one end of the loudspeaker, and the other end of the loudspeaker is grounded.
Compared with the prior art, the invention has the beneficial effects that: the invention is provided with the instant driving module, and when detecting that the magnitude of the leakage exceeds the amplitude, the instant driving module supplies power to the control and alarm module for protection treatment; during the protection process, the detection driving module continuously detects whether electric leakage exists or not, and after confirmation, the control and alarm module is also powered to take over protection; after the instantaneous driving module works, the delay grounding module delays to output the signal to the control and alarm module for voltage grounding, so that instantaneous protection is avoided, namely electric leakage misjudgment is avoided.
Drawings
Fig. 1 is a schematic diagram of an intelligent detection circuit for leakage of a power switch cabinet.
Fig. 2 is a circuit diagram of a first part of an intelligent detection circuit for electric leakage of a power switch cabinet.
Fig. 3 is a second partial circuit diagram of the intelligent detection circuit for electric leakage of the power switch cabinet.
Fig. 4 is a third partial circuit diagram of the intelligent detection circuit for electric leakage of the power switch cabinet.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Referring to fig. 1, an intelligent detection circuit for leakage of a power switch cabinet includes:
the switch cabinet power distribution module 1 is used for distributing power for lower-level equipment;
the leakage detection module 2 is used for detecting whether a distribution line of the switch cabinet leaks electricity or not, acquiring leakage voltage during leakage and outputting the leakage voltage to the leakage amplitude detection module 3;
the leakage amplitude detection module 3 is used for detecting whether the leakage voltage exceeds a threshold value, and outputting voltage for the instant driving module 4 and the detection driving module 5 when the leakage voltage exceeds the threshold value;
the instant driving module 4 is used for supplying power to the control and alarm module 7 after receiving the voltage;
the detection driving module 5 is used for supplying power to the control and alarm module 7 after continuously receiving the voltage;
the delay grounding module 6 is used for forming a loop by the instant driving module 4 and the circuit negative electrode (namely grounding) after the instant driving module 4 receives the voltage and delays;
the control and alarm module 7 is used for controlling the switch cabinet power distribution module 1 to change the power distribution condition after receiving the voltage of the instant driving module 4 or the detection driving module 5, and alarming and prompting at the same time;
the input of leakage detection module 2 is connected to switch cabinet distribution module 1's output, the input of leakage amplitude detection module 3 is connected to leakage detection module 2's output, the input of instantaneous drive module 4 is connected to leakage amplitude detection module 3's output, detect the input of drive module 5, the input of delay grounding module 6 is connected to instantaneous drive module 4's first output, control and alarm module 7's input is connected to instantaneous drive module 4's second output, control and alarm module 7's input is connected to detection drive module 5's output, switch cabinet distribution module 1 is connected to control and alarm module 7's output.
In this embodiment: referring to fig. 2, the switch cabinet power distribution module 1 includes a first live wire L1, a second live wire L2, a first neutral wire N1, a second neutral wire N2, a first switch S1, a second switch S2, a first interface K1, a second interface K2, a third interface K3, and a fourth interface K4, where the first switch S1 and the second switch S2 are double pole double throw switches, the first live wire L1 is connected with one end of the first interface K1, the first neutral wire N1 is connected with one end of the second interface K2, the second live wire L2 is connected with one end of the third interface K3, the second neutral wire N2 is connected with one end of the fourth interface K4, one end of the first switch S1 is connected with the first interface K1 or the third interface K3, one end of the second switch S2 is connected with the second interface K2 or the fourth interface K4, the other end of the first switch S1 is connected with a lower device, and the other end of the second switch S2 is connected with a lower device.
Under the normal power distribution condition of the switch cabinet, the first switch S1 is connected with the first interface K1, the second switch S2 is connected with the second interface K2, and the first live wire L1 and the second live wire L2 supply power for the subordinate equipment through the first switch S1 and the second switch S2; under the condition that the electricity leakage of the distribution lines occurs, the first switch S1 is controlled by the final control and alarm module 7 to be connected with the third interface K3, the second switch S2 is controlled by the fourth interface K4, and the other group of distribution lines are used for supplying power to the subordinate equipment.
In another embodiment: the second live wire L2 and the second neutral wire N2 are used as standby power supply lines to supply power to the subordinate devices, and the control switch can be directly turned off to stop supplying power to the subordinate devices.
In this embodiment: referring to fig. 2, the leakage detection module 2 includes a transformer X, a first diode D1, a first capacitor C1, a first resistor R1, and a first potentiometer RP1, wherein one end of the transformer X is connected to the positive electrode of the first diode D1, the other end of the transformer X is grounded, the negative electrode of the first diode D1 is connected to one end of the first capacitor C1 and one end of the first resistor R1, the other end of the first capacitor C1 is grounded, the other end of the first resistor R1 is connected to one end of the first potentiometer RP1, the other end of the first potentiometer RP1 is grounded, and the sliding end of the first potentiometer RP1 is connected to the leakage amplitude detection module 3.
When no electric leakage exists in the first live wire L1 and the first zero line N1, the current of the first live wire L1 and the current of the first zero line N1 passing through the transformer X are equal in magnitude and opposite in direction, and the transformer X does not output current; when leakage exists, the transformer X outputs a current signal, and finally forms a stable voltage signal on the first resistor R1 and the first potentiometer RP1 through the first diode D1 and the first capacitor C1, the part below the sliding end of the first potentiometer RP1 is a sampling resistor, the upper voltage of the first potentiometer RP1 is a sampling voltage (namely the leakage voltage), and the sampling voltage is output to the leakage amplitude detection module 3.
In another embodiment: the first potentiometer RP1 may be omitted such that the duty cycle of the sampled voltage on the acquisition voltage based on the transformer X will not be adjusted.
In this embodiment: referring to fig. 2, the leakage amplitude detection module 3 includes a first amplifier U1, a second resistor R2, a second diode D2, and a second capacitor C2, wherein the in-phase end of the first amplifier U1 is connected to the output end of the leakage detection module 2, the inverting end of the first amplifier U1 is connected to one end of the second resistor R2, the cathode of the second diode D2, one end of the second capacitor C2, the anode of the second diode D2 is grounded, the other end of the second capacitor C2 is grounded, and the other end of the second resistor R2 is connected to the supply voltage VCC.
In the use process of the power supply line, the loss of the power supply line exists, the insulation degree is reduced, the current of the first live wire L1 and the first zero wire N1 passing through the transformer X is inconsistent, sampling voltage can be generated, and therefore the leakage amplitude detection module 3 is arranged to filter the sampling voltage with lower voltage; the second diode D2 is used as a zener diode, the voltage on the second diode D2 is stable, and only if the sampling voltage is greater than the voltage on the second diode D2, the first amplifier U1 is triggered to output a high level, so that a high level is provided for a subsequent circuit.
In another embodiment: instead of a zener diode, other voltage stabilizing devices may be used as a voltage stabilizing source to provide a stabilized voltage to the inverting terminal of the first amplifier U1.
In this embodiment: referring to fig. 3, the instantaneous driving module 4 includes a first silicon controlled rectifier Z1 and a fourth diode D4, wherein the positive electrode of the first silicon controlled rectifier Z1 is connected with the power supply voltage VCC, the reference electrode of the first silicon controlled rectifier Z1 is connected with the output end of the leakage amplitude detection module 3, the negative electrode of the first silicon controlled rectifier Z1 is connected with the positive electrode of the fourth diode D4, the input end of the delay grounding module 6, and the negative electrode of the fourth diode D4 is connected with the input end of the control and alarm module 7.
Because the switch cabinet is dangerous once electric leakage occurs, the switch cabinet needs to be processed in time, after the electric leakage amplitude detection module 3 outputs high level, the first silicon controlled rectifier Z1 is conducted, and the power supply voltage VCC supplies power to the control and alarm module 7 through the first silicon controlled rectifier Z1 and the fourth diode D4, so that the power distribution problem of the switch cabinet power distribution module 1 is processed in time.
In another embodiment: the power supply voltage VCC may be supplied by a battery or may be supplied by converting ac power into dc power.
In this embodiment: referring to fig. 3, the detection driving module 5 includes a third diode D3, a third resistor R3, a second potentiometer RP2, a third capacitor C3, a first MOS transistor V1, a third thyristor Z3, and a fifth diode D5, where an anode of the third diode D3 is connected to an output end of the leakage amplitude detection module 3, a cathode of the third diode D3 is connected to one end of the third resistor R3, another end of the third resistor R3 is connected to one end of the second potentiometer RP2, another end of the second potentiometer RP2 is connected to one end of the third capacitor C3, a G pole of the first MOS transistor V1 is grounded, a D pole of the first MOS transistor V1 is connected to a supply voltage VCC, an anode of the third thyristor Z3, an S pole of the first MOS transistor V1 is connected to a control pole of the third thyristor Z3, a cathode of the third thyristor Z3 is connected to an anode of the fifth diode D5, and a cathode of the fifth diode D5 is connected to an input end of the alarm module 7.
Considering short-time electric leakage caused by environmental factors (such as lightning stroke, earthquake and other natural factors), electromagnetic interference (changing the current of a power supply line) and other reasons, the detection driving module 5 is arranged, the third capacitor C3 is charged enough to conduct the first MOS tube V1 only through the third diode D3, the third resistor R3 and the second potentiometer RP2 within a certain time, the third controllable silicon Z3 is triggered to conduct, the power supply voltage VCC continuously supplies power to the control and alarm module 7 through the third controllable silicon Z3 and the fifth diode D5, and the power distribution problem of the switch cabinet power distribution module 1 is solved; otherwise, based on short-time leakage caused by environmental factors, electromagnetic interference and the like, the third capacitor C3 cannot be charged enough to turn on the first MOS transistor V1, so that the control and alarm module 7 cannot continuously work.
In another embodiment: the second potentiometer RP2 can be replaced with a common resistor, which will not be able to adjust the charging speed of the third capacitor C3.
In this embodiment: referring to fig. 3, the delay grounding module 6 includes a fourth resistor R4, a fourth capacitor C4, a second MOS transistor V2, and a second thyristor Z2, one end of the fourth resistor R4 is connected to the positive electrode of the second thyristor Z2, the D electrode of the second MOS transistor V2, the first output end of the instant driving module 4, the other end of the fourth resistor R4 is connected to one end of the fourth capacitor C4, the G electrode of the second MOS transistor V2, the other end of the fourth capacitor C4 is grounded, the S electrode of the second MOS transistor V2 is connected to the control electrode of the second thyristor Z2, and the negative electrode of the second thyristor Z2 is grounded.
When the leakage amplitude detection module 3 outputs a high level, the instant driving module 4 is conducted to supply power to the control and alarm module 7, and the control and alarm module 7 performs protection treatment on the power distribution cabinet; meanwhile, the detection driving module 5 detects whether the leakage amplitude detection module 3 continuously outputs a high level, the delay grounding module 6 charges a fourth capacitor C4 through a fourth resistor R4, after the fourth capacitor C4 is charged enough to conduct a second MOS tube V2 (the charging time of the fourth capacitor C4 is required to be longer than that of a third capacitor C3), the second silicon controlled rectifier Z2 is controlled to be conducted to the ground, the instant driving module 4 is grounded and discharged, the power supply to the control and alarm module 7 is stopped, and based on the fact that the charging time of the fourth capacitor C4 is longer than that of the third capacitor C3, if short-time leakage is caused by environmental factors, electromagnetic interference and the like, the detection driving module 5 cannot supply power to the control and alarm module 7, and the switch cabinet distribution module 1 is restored to an initial state; if the power is continuously leaked due to abnormal insulation of the distribution line, the detection driving module 5 supplies power to the control and alarm module 7 (before the instant driving module 4 is turned on and stops supplying power to the control and alarm module 7), so that the power supply switching problem is avoided.
After the instant driving module 4 is triggered once, the time delay grounding module 6 continuously works and is grounded, the instant driving module 4 can not supply power to the control and alarm module 7 due to environmental factors, electromagnetic interference and the like, and safety (the instant driving module 4 timely processes when the electric leakage is performed for the first time) and false alarm prevention (the detection driving module 5 processes after the electric leakage information is fully detected) are considered; after the detection driving module 5 supplies power to the control and alarm module 7 for processing based on continuous electric leakage caused by abnormal insulation of the distribution line and the like, a user needs to cut off power in the detection processing process of the distribution cabinet.
In another embodiment, a light emitting diode may be added to indicate whether the time delay grounding module 6 is operating.
In this embodiment: referring to fig. 4, the control and alarm module 7 includes a relay J1, a sixth diode D6, and a SPEAKER, wherein one end of the relay J1 is connected to the negative electrode of the sixth diode D6, the second output end of the instant driving module 4, and the output end of the detection driving module 5, the other end of the relay J1 is connected to the positive electrode of the sixth diode D6 and one end of the SPEAKER, and the other end of the SPEAKER is grounded.
When voltage is input, the relay J1 is powered on, the first switch S1 is controlled to be connected with the third interface K3, the second switch S2 is controlled to be connected with the fourth interface K4 (the original control of the first switch S1 is connected with the first interface K1, the second switch S2 is connected with the second interface K2), the standby power supply line is switched to supply power for the subordinate equipment, and meanwhile the loudspeaker SPEAKER is powered on and is in operation to give a warning.
In another embodiment: the sixth diode D6 may be omitted, and the sixth diode D6 may function as a freewheel diode for discharging a large current at the moment when the relay J1 is operated or stopped.
The working principle of the invention is as follows: the switch cabinet power distribution module 1 is used for distributing power for subordinate equipment; the leakage detection module 2 is used for detecting whether a distribution line of the switch cabinet leaks electricity or not, acquiring leakage voltage during leakage and outputting the leakage voltage to the leakage amplitude detection module 3; the leakage amplitude detection module 3 is used for detecting whether the leakage voltage exceeds a threshold value, and outputting voltage for the instant driving module 4 and the detection driving module 5 when the leakage voltage exceeds the threshold value; the instant driving module 4 is used for supplying power to the control and alarm module 7 after receiving the voltage; the detection driving module 5 is used for supplying power to the control and alarm module 7 after continuously receiving the voltage; the delay grounding module 6 is used for forming a loop by the instant driving module 4 and the circuit negative electrode after the instant driving module 4 receives the voltage and delays; the control and alarm module 7 is used for controlling the switch cabinet power distribution module 1 to change the power distribution condition after receiving the voltage of the instant driving module 4 or the detection driving module 5, and simultaneously giving an alarm and prompting.
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 characteristics 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. An intelligent detection circuit for leakage of a power switch cabinet, comprising:
the switch cabinet power distribution module is used for distributing power for the subordinate equipment;
the leakage detection module is used for detecting whether the distribution line of the switch cabinet leaks electricity or not, acquiring leakage voltage during leakage and outputting the leakage voltage to the leakage amplitude detection module;
the leakage amplitude detection module is used for detecting whether the leakage voltage exceeds a threshold value, and outputting the voltage for the instant driving module and the detection driving module when the leakage voltage exceeds the threshold value;
the intelligent detection circuit for the electric leakage of the power switch cabinet is characterized by further comprising:
the instantaneous driving module is used for supplying power to the control and alarm module after receiving the voltage;
the detection driving module is used for supplying power to the control and alarm module after continuously receiving the voltage;
the delay grounding module is used for forming a loop by the instant driving module and the circuit cathode after the instant driving module receives the voltage and delays;
the control and alarm module is used for controlling the switch cabinet power distribution module to change the power distribution condition after receiving the voltage of the instant driving module or the detection driving module, and giving an alarm and prompting at the same time;
the output end of the switch cabinet power distribution module is connected with the input end of the electric leakage detection module, the output end of the electric leakage detection module is connected with the input end of the electric leakage amplitude detection module, the output end of the electric leakage amplitude detection module is connected with the input end of the instantaneous driving module and the input end of the detection driving module, the first output end of the instantaneous driving module is connected with the input end of the delay grounding module, the second output end of the instantaneous driving module is connected with the input end of the control and alarm module, the output end of the detection driving module is connected with the input end of the control and alarm module, and the output end of the control and alarm module is connected with the switch cabinet power distribution module;
the instantaneous driving module comprises a first silicon controlled rectifier and a fourth diode, wherein the positive electrode of the first silicon controlled rectifier is connected with the power supply voltage, the reference electrode of the first silicon controlled rectifier is connected with the output end of the leakage amplitude detection module, the negative electrode of the first silicon controlled rectifier is connected with the positive electrode of the fourth diode and the input end of the delay grounding module, and the negative electrode of the fourth diode is connected with the input end of the control and alarm module;
the detection driving module comprises a third diode, a third resistor, a second potentiometer, a third capacitor, a first MOS tube, a third silicon controlled rectifier and a fifth diode, wherein the positive electrode of the third diode is connected with the output end of the leakage amplitude detection module, the negative electrode of the third diode is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the second potentiometer, the other end of the second potentiometer is connected with one end of the third capacitor and the G electrode of the first MOS tube, the other end of the third capacitor is grounded, the D electrode of the first MOS tube is connected with a power supply voltage and the positive electrode of the third silicon controlled rectifier, the S electrode of the first MOS tube is connected with the control electrode of the third silicon controlled rectifier, the negative electrode of the third silicon controlled rectifier is connected with the positive electrode of the fifth diode, and the negative electrode of the fifth diode is connected with the input end of the control and alarm module;
the delay grounding module comprises a fourth resistor, a fourth capacitor, a second MOS tube and a second silicon controlled rectifier, wherein one end of the fourth resistor is connected with the anode of the second silicon controlled rectifier, the D electrode of the second MOS tube and the first output end of the instant driving module, the other end of the fourth resistor is connected with one end of the fourth capacitor and the G electrode of the second MOS tube, the other end of the fourth capacitor is grounded, the S electrode of the second MOS tube is connected with the control electrode of the second silicon controlled rectifier, and the negative electrode of the second silicon controlled rectifier is grounded.
2. The intelligent detection circuit for electric leakage of power switch cabinet according to claim 1, wherein the switch cabinet power distribution module comprises a first live wire, a second live wire, a first zero wire, a second zero wire, a first switch, a second switch, a first interface, a second interface, a third interface and a fourth interface, the first switch and the second switch are double-pole double-throw switches, the first live wire is connected with one end of the first interface, the first zero wire is connected with one end of the second interface, the second live wire is connected with one end of the third interface, the second zero wire is connected with one end of the fourth interface, one end of the first switch is connected with the first interface or the third interface, one end of the second switch is connected with the second interface or the fourth interface, the other end of the first switch is connected with lower-level equipment, and the other end of the second switch is connected with lower-level equipment.
3. The intelligent detection circuit for electric leakage of power switch cabinet according to claim 1, wherein the electric leakage detection module comprises a transformer, a first diode, a first capacitor, a first resistor and a first potentiometer, one end of the transformer is connected with the positive electrode of the first diode, the other end of the transformer is grounded, the negative electrode of the first diode is connected with one end of the first capacitor and one end of the first resistor, the other end of the first capacitor is grounded, the other end of the first resistor is connected with one end of the first potentiometer, the other end of the first potentiometer is grounded, and the sliding end of the first potentiometer is connected with the electric leakage amplitude detection module.
4. The intelligent detection circuit for electric leakage of power switch cabinet according to claim 1, wherein the electric leakage amplitude detection module comprises a first amplifier, a second resistor, a second diode and a second capacitor, the in-phase end of the first amplifier is connected with the output end of the electric leakage detection module, the reverse phase end of the first amplifier is connected with one end of the second resistor, the negative electrode of the second diode and one end of the second capacitor, the positive electrode of the second diode is grounded, the other end of the second capacitor is grounded, and the other end of the second resistor is connected with the power supply voltage.
5. The intelligent detection circuit for electric leakage of power switch cabinet according to claim 1, wherein the control and alarm module comprises a relay, a sixth diode and a loudspeaker, one end of the relay is connected with the cathode of the sixth diode, the second output end of the instant driving module and the output end of the detection driving module, the other end of the relay is connected with the anode of the sixth diode and one end of the loudspeaker, and the other end of the loudspeaker is grounded.
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| CN117650482B (en) * | 2024-01-30 | 2024-04-05 | 深圳市群晖智能科技股份有限公司 | Leakage detection safety protection circuit |
| CN118091486B (en) * | 2024-04-18 | 2024-06-28 | 山东云开电力有限公司 | Power switch cabinet state monitoring system |
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Denomination of invention: An intelligent leakage detection circuit for power switchgear Granted publication date: 20231013 Pledgee: Weihai City Commercial Bank Limited by Share Ltd. high tech branch Pledgor: Shandong Yunkai Electric Power Co.,Ltd. Registration number: Y2024980005066 |
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