Grounding switch prevents live operation grounding knife block device and its anti-misoperation method

Abstract

The application discloses a grounding switch prevents live operation grounding knife blocking device and a mistaken operation prevention method thereof. The grounding switch prevents live operation grounding knife blocking device comprises a power supply circuit, a control circuit, a live detection circuit and a motor driving circuit which are connected with the power supply circuit. The data acquisition port of the control circuit is in contact with the cable to be detected through a plurality of groups of live detection circuits. The control end of the control circuit is connected with the input end of the motor driving circuit. The output end of the motor driving circuit is connected with the motor control end. The driving end of the motor is connected with the telescopic rod through a speed reduction mechanism. The application discloses a grounding switch prevents live operation grounding knife blocking device and a mistaken operation prevention method thereof, which can improve the electrical safety performance of the circuit, and the operation diversity and convenience.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of water conservancy equipment, in particular to a grounding switch anti-live-line-operation grounding-knife blocking device and an anti-misoperation method thereof. BACKGROUND

[0002] The grounding switch of a high-voltage switch cabinet is generally mechanically interlocked with a load switch, and when the load switch is closed, the grounding switch cannot be operated to ground, and only when the load switch is opened, the grounding switch can be operated to ground. However, in actual work, when the load switch is not closed, the incoming cable of the incoming switch cabinet is live, and if the grounding switch is grounded at this time, the high-voltage switch cabinet will be instantaneously grounded, and the risk of cabinet explosion will occur. In order to avoid the phenomenon of closing the grounding switch under the condition of live high-voltage line, it is urgent to develop a grounding switch anti-live-line-operation grounding-knife blocking device and an anti-misoperation method thereof which can improve the electrical safety performance of the circuit. SUMMARY

[0003] The application overcomes the shortcomings of the prior art and provides a grounding switch anti-live-line-operation grounding-knife blocking device and an anti-misoperation method thereof, which can improve the electrical safety performance of the circuit, and the operation diversity and convenience.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows: a grounding switch anti-live-line-operation grounding-knife blocking device, comprising: a power supply circuit, and a control circuit, a live-line detection circuit and a motor driving circuit connected with the power supply circuit.

[0005] The data acquisition port of the control circuit is in contact with the cable to be detected through a plurality of groups of live-line detection circuits; the control end of the control circuit is connected with the input end of the motor driving circuit, the output end of the motor driving circuit is connected with the motor control end, and the driving end of the motor is connected with the telescopic rod through a speed reduction mechanism.

[0006] In a preferred scheme of the application, the output end of the control circuit is further connected with a live-line locking output module.

[0007] The live-line locking output module comprises: a Darlington array control chip connected with the control circuit, the port of the Darlington array control chip is connected with an indicator lamp circuit and a relay control circuit respectively, the indicator lamp circuit is used for displaying the detection state of the corresponding cable to be detected; the normally open contact of the output end of the relay control circuit is connected with an external device control loop, when the high-voltage cable is live, the relay contact is disconnected, and the indicator lamp is bright, indicating that the high-voltage cable is live; when the high-voltage cable is not live, the relay contact is closed, and the indicator lamp is not bright, indicating that the high-voltage cable is not live.

[0008] In a preferred solution of the present application, the plurality of groups of live detection circuits comprises an A-phase live detection circuit, a B-phase live detection circuit and a C-phase live detection circuit, and the A-phase live detection circuit, the B-phase live detection circuit and the C-phase live detection circuit are respectively connected to an A-phase live detection sensor, a B-phase live detection sensor and a C-phase live detection sensor in contact with an A-phase cable to be detected, a B-phase cable to be detected and a C-phase cable to be detected in the three-phase cable to be detected.

[0009] In a preferred solution of the present application, the A-phase live detection circuit comprises a capacitor C1A and a capacitor C2A connected to the A-phase live detection sensor, and the capacitor C2A is grounded, and a node of the capacitor C1A and the capacitor C2A is connected to an inverting input terminal of a dual voltage comparator one, and an output terminal of the dual voltage comparator one is connected to a data acquisition port of a control circuit, and the output terminal of the dual voltage comparator one is further connected to a power supply terminal of the dual voltage comparator one through a resistor R2, and the power supply terminal of the dual voltage comparator one is grounded through a regulating resistor RP1, and a control terminal of the regulating resistor RP1 is connected to a forward input terminal of the dual voltage comparator one.

[0010] The B-phase live detection circuit comprises a capacitor C1B and a capacitor C2B connected to the B-phase live detection sensor, and the capacitor C2B is grounded, and a node of the capacitor C1B and the capacitor C2B is connected to an inverting input terminal of a dual voltage comparator two, and an output terminal of the dual voltage comparator two is connected to a data acquisition port of a control circuit, and the output terminal of the dual voltage comparator two is further connected to a power supply terminal of the dual voltage comparator two through a resistor R4, and the power supply terminal of the dual voltage comparator two is grounded through a regulating resistor RP2, and a control terminal of the regulating resistor RP2 is connected to a forward input terminal of the dual voltage comparator two.

[0011] The C-phase live detection circuit comprises a capacitor C1C and a capacitor C2C connected to the C-phase live detection sensor, and the capacitor C2C is grounded, and a node of the capacitor C1C and the capacitor C2C is connected to an inverting input terminal of a dual voltage comparator three, and an output terminal of the dual voltage comparator three is connected to a data acquisition port of a control circuit, and the output terminal of the dual voltage comparator three is further connected to a power supply terminal of the dual voltage comparator three through a resistor R5, and the power supply terminal of the dual voltage comparator three is grounded through a regulating resistor RP3, and a control terminal of the regulating resistor RP3 is connected to a forward input terminal of the dual voltage comparator three.

[0012] In a preferred solution of the present application, the control circuit comprises a single-chip microcomputer control chip, and the single-chip microcomputer control chip is connected with a reset switch and a clock circuit.

[0013] In a preferred scheme of the present application, the power supply circuit comprises: a power supply, the output end of the power supply is connected with an input filter capacitor C16 in parallel, one end of the input filter capacitor C16 is grounded, the other end of the input filter capacitor C16 is connected with the input end of a linear voltage regulator U12, the output end of the linear voltage regulator U12 serves as a VCC power supply, and the output end of the linear voltage regulator U12 is grounded through an output filter capacitor C30;

[0014] The output end of the linear voltage regulator U12 is connected with the input end of a power conversion chip U13, the output end of the power conversion chip U13 serves as a power supply VDD, the input end of the power conversion chip U13 is grounded through a filter capacitor C19, and the output end of the power conversion chip U13 is grounded through filter capacitors C18 and C17 connected in parallel.

[0015] In a preferred scheme of the present application, the motor driving circuit comprises: one end of parallel-connected resistors R9 and R10 connected with the in pin of the single-chip microcomputer control chip, the other end of the resistor R9 connected with the base of a transistor Q4, the emitter of the transistor Q4 connected with the power supply; the other end of the resistor R10 connected with the base of a transistor Q2, the emitter of the transistor Q2 grounded, and the collector of the transistor Q4 connected with one end of a motor U5.

[0016] One end of a signal shaping trigger connected with the in pin of the single-chip microcomputer control chip, the other end of the signal shaping trigger connected with one end of parallel-connected resistors R11 and R12, the other end of the resistor R11 connected with the base of a transistor Q1, the emitter of the transistor Q1 connected with the power supply, the other end of the resistor R12 connected with the base of a transistor Q3, the emitter of the transistor Q3 grounded, and the collector of the transistor Q1 connected with the other end of the motor U5.

[0017] In a preferred scheme of the present application, the speed reduction mechanism adopts a brushless planetary speed reduction motor lead screw. The brushless planetary speed reduction motor lead screw adopts a 3640 type brushless planetary speed reduction motor lead screw. The brushless planetary speed reduction motor lead screw comprises two groups of large speed ratio reduction gears, the speed reduction ratio is 500-1000:1, and the output torque is increased.

[0018] In a preferred scheme of the present application, the single-chip microcomputer control chip is further connected with a Bluetooth communication module circuit; the Bluetooth communication module circuit comprises a Bluetooth module chip H6 connected with the TX pin and the RX pin of the single-chip microcomputer control chip.

[0019] In a preferred scheme of the present application, a false operation prevention method of a grounding switch prevents a live operation grounding knife blocking device, is realized by using a grounding switch prevents a live operation grounding knife blocking device, and comprises the following steps:

[0020] When the A-phase live-line measurement sensor, the B-phase live-line measurement sensor and the C-phase live-line measurement sensor measure that the three-phase to-be-measured cable does not have square wave signals, the three-phase to-be-measured cable is not live, the control circuit sends a command to the motor drive circuit, the motor drive circuit drives the motor to reverse, drives the telescopic rod to retract, and the telescopic rod exits the grounding switch operation hole, so that the grounding switch operation hole is not blocked, and the grounding switch can be operated at this time, and the corresponding indicator lamp of the live-line display circuit is off, and the locking relay contact of the live-line locking output circuit is closed.

[0021] When the A-phase live-line measurement sensor, the B-phase live-line measurement sensor and the C-phase live-line measurement sensor measure that the three-phase to-be-measured cable does not have square wave signals, the three-phase to-be-measured cable is not live, the control circuit sends a command to the motor drive circuit, the motor drive circuit drives the motor to reverse, drives the telescopic rod to retract, and the telescopic rod exits the grounding switch operation hole, so that the grounding switch operation hole is not blocked, and the grounding switch can be operated at this time, and the corresponding indicator lamp of the live-line display circuit is off, and the locking relay contact of the live-line locking output circuit is closed.

[0022] When the to-be-measured cable is live, the grounding switch operation hole is removed.

[0023] The grounding switch prevents the live-line operation grounding knife blocking device and the anti-misoperation method thereof can improve the electrical safety performance of the circuit, and the operation diversity and convenience.

[0024] 1. The metal sheet wrapped on the surface of the cable is used to collect the live-line information of the high-voltage cable, and the live-line measurement conditioning circuit is used to convert the alternating voltage signal into a 50Hz square wave signal, so that the frequency of the square wave signal is measured to determine whether the cable is live, and the accuracy of the live-line information is further improved, and the misjudgment caused by the induced current is avoided.

[0025] 2. The forward and reverse rotation of the control micro motor is used to block the grounding switch operation hole, so that the risk of closing the grounding knife when live is avoided.

[0026] 3. When the live condition needs to be forcibly unlocked, a mobile phone is used to send a signal to unlock, which is more secure. BRIEF DESCRIPTION OF DRAWINGS

[0027] The application will be further described below in combination with the drawings and examples.

[0028] Figure 1 is a working principle diagram of a grounding switch live-line operation grounding knife blocking device of the application;

[0029] Figure 2 is a minimum system circuit diagram of a microprocessor module of a grounding switch live-line operation grounding knife blocking device of the application;

[0030] Figure 3 is a A phase live measurement conditioning circuit diagram of the grounding switch prevents live operation grounding knife blocking device of the application;

[0031] Figure 4 is a B phase live measurement conditioning circuit diagram of the grounding switch prevents live operation grounding knife blocking device of the application;

[0032] Figure 5 is a C phase live measurement conditioning circuit diagram of the grounding switch prevents live operation grounding knife blocking device of the application;

[0033] Figure 6 is a 9V to 5V circuit diagram of the grounding switch prevents live operation grounding knife blocking device of the application;

[0034] Figure 7 is a 5V to 3.3V circuit diagram of the grounding switch prevents live operation grounding knife blocking device of the application;

[0035] Figure 8 is a motor drive circuit diagram of the grounding switch prevents live operation grounding knife blocking device of the application;

[0036] Figure 9 is a live display and locking output circuit diagram of the grounding switch prevents live operation grounding knife blocking device of the application;

[0037] Figure 10 is a Bluetooth communication module circuit diagram of the grounding switch prevents live operation grounding knife blocking device of the application. DETAILED DESCRIPTION

[0038] The technical solutions of the application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the embodiments of the application and the specific features in the embodiments are detailed descriptions of the technical solutions of the application, rather than limitations of the technical solutions of the application. In the case of no conflict, the technical features in the embodiments of the application and the embodiments can be combined with each other.

[0039] The term "and / or", only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / ", generally represents that the front and rear associated objects are a "or" relationship.

[0040] Embodiment one, such as Figures 1-10As shown, a grounding switch prevents live operation grounding knife blocking device, including: power supply circuit, and with power supply circuit connected control circuit, live detection circuit, motor drive circuit. Control circuit data acquisition port through a number of groups of live detection circuit and the cable to be measured contact; control circuit control end and motor drive circuit input end connection, the output end of the motor drive circuit and motor control end connection, the drive end of the motor through the speed reduction mechanism and telescopic rod connection. In this embodiment, telescopic rod adopts metal or non-metal material, through the positive and negative rotation of the motor can realize telescopic rod extension and contraction, telescopic rod shielding operation hole when telescopic rod contraction, grounding switch operation hole without shielding.

[0041] Specifically, the power supply circuit includes: power supply, in this embodiment, the power supply is powered by a 9-12V lithium battery. The output end of the power supply is connected with an input filter capacitor C16 in parallel, one end of the input filter capacitor C16 is grounded, the other end of the input filter capacitor C16 is connected with the input end of a linear voltage regulator U12, the output end of the linear voltage regulator U12 is used as a VCC power supply, and the output end of the linear voltage regulator U12 is grounded through an output filter capacitor C30; the output end of the linear voltage regulator U12 is connected with the input end of a power conversion chip U13, the output end of the power conversion chip U13 is used as a power supply VDD, the input end of the power conversion chip U13 is grounded through a filter capacitor C19, and the output end of the power conversion chip U13 is grounded through parallel filter capacitors C18 and C17.

[0042] Specifically, the control circuit includes a single-chip microcomputer control chip, and the single-chip microcomputer control chip is connected with a reset switch and a clock circuit.

[0043] Specifically, the plurality of groups of live detection circuits include A-phase live detection circuit, B-phase live detection circuit and C-phase live detection circuit, and the A-phase live detection circuit, the B-phase live detection circuit and the C-phase live detection circuit are respectively connected with A-phase live measurement sensors, B-phase live measurement sensors and C-phase live measurement sensors which are in contact with A-phase cables to be measured, C-phase cables to be measured and C-phase cables to be measured in the three-phase cables to be measured.

[0044] Specifically, the motor drive circuit includes: one end of resistors R9 and R10 connected in parallel to the in pin of the microcontroller control chip; the other end of resistor R9 is connected to the base of transistor Q4, and the emitter of transistor Q4 is connected to the power supply; the other end of resistor R10 is connected to the base of transistor Q2, and the emitter of transistor Q2 is grounded; the collector of transistor Q4 and the collector of transistor Q4 are connected to one end of motor U5 at the same point; one end of a signal shaping trigger connected to the in pin of the microcontroller control chip is connected; the other end of the signal shaping trigger is connected to one end of resistors R11 and R12 connected in parallel; the other end of resistor R11 is connected to the base of transistor Q1, and the emitter of transistor Q1 is connected to the power supply; the other end of resistor R12 is connected to the base of transistor Q3, and the emitter of transistor Q3 is grounded; the collector of transistor Q1 and the collector of transistor Q3 are connected to the other end of motor U5 at the same point. The motor drive circuit uses four transistors to form an H-bridge circuit to achieve forward and reverse rotation of the micro motor. In this embodiment, the motor is a DC brushed motor with a speed of 10,000 rpm and an operating voltage of 5-12VDC.

[0045] Example 2, based on Example 1, such as Figures 1-10 As shown, in this embodiment, the output terminal of the control circuit is also connected to a live-lock output module. The live-lock output module includes a Darlington array control chip connected to the control circuit. The ports of the Darlington array control chip are respectively connected to an indicator light circuit and a relay control circuit. The indicator light circuit is used to display the detection status of the corresponding cable under test. The normally closed contact of the relay control circuit output terminal is connected to the external device control circuit. When the high-voltage cable is energized, the relay contact opens, and the indicator light illuminates, indicating that the high-voltage cable is energized; when the high-voltage cable is not energized, the relay contact closes, and the indicator light does not illuminate, indicating that the high-voltage cable is not energized. Further, the indicator light circuit uses three LEDs (yellow, green, and red) to represent whether the three phases A, B, and C of the cable are energized, respectively. The live-lock output module uses a 5V DC relay. When any phase of the three phases A, B, or C of the cable is energized, the relay contact opens; when none of the three phases A, B, or C of the cable are energized, the relay contact closes.

[0046] In Example 3, based on Example 1 or Example 2, the microcontroller control chip is further connected to a Bluetooth communication module circuit. The Bluetooth communication module circuit includes a Bluetooth module chip H6 connected to the TX and RX pins of the microcontroller control chip. In this example, the Bluetooth module chip H6 uses an HC-05 high-speed wireless serial port transparent transmission SPP / BLE5.0 dual-mode module data transmission communication Bluetooth module.

[0047] In the fourth embodiment, on the basis of the first embodiment or the second embodiment or the third embodiment, the control circuit comprises a single-chip microcomputer control chip, and the single-chip microcomputer control chip is connected with a reset switch and a clock circuit. Specifically, the single-chip microcomputer control chip is an STM32 chip, and the single-chip microcomputer control chip in this embodiment is an STM32F103C8T6 single-chip microcomputer. The reset switch comprises a switch SW1, one end of the switch SW1 is connected with a RESET pin of the single-chip microcomputer control chip, the other end of the switch SW1 is grounded, and the two ends of the switch SW1 are further connected with a capacitor C7 in parallel, and the path connecting the switch SW1 and the RESET pin further connects to a power supply through a resistor R3; the clock circuit is a passive crystal oscillator clock circuit, which comprises a passive crystal oscillator Y1 connected in parallel with an osc-in pin and an osc-out pin of the single-chip microcomputer control chip, and the passive crystal oscillator Y1 is connected with a feedback resistor R1 in parallel, and the two ends of the passive crystal oscillator Y1 are respectively connected to the ground through a starting capacitor C1 and a starting capacitor C2; the single-chip microcomputer control chip is further connected with a download port H1, and the access end of the download port H1 is respectively connected with a SWCLK pin and a SWDIO pin of the single-chip microcomputer control chip.

[0048] Specifically, the A-phase live detection circuit comprises a capacitor C1A and a capacitor C2A connected with an A-phase live measurement sensor and grounded through the capacitor C2A, and a node of the capacitor C1A and the capacitor C2A is connected with an inverting input end of a dual-voltage comparator one, an output end of the dual-voltage comparator one is connected with a data acquisition port of the control circuit, the output end of the dual-voltage comparator one is further connected with a power supply end of the dual-voltage comparator one through a resistor R2, the power supply end of the dual-voltage comparator one is grounded through an adjusting resistor RP1, and a control end of the adjusting resistor RP1 is connected with a forward input end of the dual-voltage comparator one. The dual-voltage comparator one in this embodiment is an LM393 comparator. The LM393 comparator can convert an AC sinusoidal voltage source signal with a large input resistance into a 50Hz square wave signal, and send the square wave signal to a microprocessor module, so that whether the signal is induced electricity or high-voltage live voltage can be judged by measuring the square wave signal and the frequency, and misjudgment is avoided.

[0049] Specifically, the B-phase live detection circuit comprises a capacitor C1B and a capacitor C2B connected with a B-phase live measurement sensor and grounded through the capacitor C2B, and a node of the capacitor C1B and the capacitor C2B is connected with an inverting input end of a dual-voltage comparator two, an output end of the dual-voltage comparator two is connected with a data acquisition port of the control circuit, the output end of the dual-voltage comparator two is further connected with a power supply end of the dual-voltage comparator two through a resistor R4, the power supply end of the dual-voltage comparator two is grounded through an adjusting resistor RP2, and a control end of the adjusting resistor RP2 is connected with a forward input end of the dual-voltage comparator two. The dual-voltage comparator two in this embodiment is an LM393 comparator.

[0050] Specifically, the C-phase live detection circuit comprises a capacitor C1C and a capacitor C2C connected with the C-phase live measurement sensor, the capacitor C2C is grounded, a node of the capacitor C1C and the capacitor C2C is connected with an inverting input terminal of a dual-voltage comparator three, an output terminal of the dual-voltage comparator three is connected with a data acquisition port of the control circuit, the output terminal of the dual-voltage comparator three is further connected with a power terminal of the dual-voltage comparator three through a resistor R5, the power terminal of the dual-voltage comparator three is grounded through a regulating resistor RP3, and a control terminal of the regulating resistor RP3 is connected with a forward input terminal of the dual-voltage comparator three. The dual-voltage comparator three in the embodiment is an LM393 comparator.

[0051] Further, the A-phase live measurement sensor, the B-phase live measurement sensor and the C-phase live measurement sensor are all 0.1mm metal sheets, which are wrapped on the surface of the cable to obtain information about whether the internal conductor of the high-voltage cable is live, there is a distributed capacitor C1 between the metal sheet and the internal conductor of the cable, and there is a distributed capacitor C2 between the metal sheet and the ground, so that two capacitors are connected in series, according to the voltage division effect of the distributed impedance, a voltage signal with a certain amplitude can be obtained at both ends of the distributed capacitor C2, that is, it is equivalent to a voltage source with a very large internal resistance, and the load capacity is very weak, so signal enhancement processing is required.

[0052] Specifically, the speed reduction mechanism comprises a micro speed reduction mechanism, and a brushless planetary speed reduction motor screw is adopted, and the brushless planetary speed reduction motor screw is a 3640 type brushless planetary speed reduction motor screw. The brushless planetary speed reduction motor screw comprises two groups of large speed ratio reduction gears, the speed reduction ratio is 500-1000:1, and the output torque is increased.

[0053] Embodiment five is a method for preventing misoperation of the grounding switch live operation grounding knife blocking device, which is implemented by the grounding switch live operation grounding knife blocking device in embodiment one or embodiment two or embodiment three or embodiment four, and the method comprises the following steps:

[0054] When the A-phase live measurement sensor, the B-phase live measurement sensor and the C-phase live measurement sensor measure that the three-phase to-be-measured cables do not have square wave signals, it is determined that the three-phase to-be-measured cables are not live, the control circuit sends a command to the motor drive circuit, the motor drive circuit drives the motor to reverse, the telescopic rod is retracted, the telescopic rod exits the grounding switch operation hole, and the grounding switch operation hole is not blocked, so that the grounding switch can be operated at this time, the corresponding indicator lamp of the live display circuit is turned off, and the latching relay contact of the live latching output circuit is closed;

[0055] When the A-phase live-line measurement sensor, the B-phase live-line measurement sensor and the C-phase live-line measurement sensor measure that the three-phase to-be-measured cable all have square wave signals, the to-be-measured cable is live, the control circuit sends a command to the motor drive circuit, the motor drive circuit drives the motor to rotate forward, the telescopic rod is extended, the telescopic rod enters the grounding switch operation hole, the grounding switch operation hole of the high-voltage switch cabinet is blocked by the telescopic rod, the grounding switch cannot be operated, and the corresponding indicator lamp of the live-line display circuit is bright, and the locking relay contact of the live-line locking output circuit is disconnected.

[0056] In the embodiment five, the anti-misoperation method of the grounding switch live-line operation grounding knife blocking device further includes: when the to-be-measured cable is live and needs to be forcibly unlocked, the grounding switch operation hole is removed from the blocking, and the control circuit can be sent with an operation command by the mobile phone through the Bluetooth wireless module.

[0057] Working principle:

[0058] The grounding switch live-line operation grounding knife blocking device and the anti-misoperation method thereof can improve the electrical safety performance of the circuit, and the operation diversity and convenience. The metal sheet wrapped on the surface of the cable is used to collect the live-line information of the high-voltage cable, and the live-line measurement conditioning circuit is used to convert the alternating voltage signal into a 50Hz square wave signal, so that whether the cable is live or not is judged by measuring the frequency of the square wave signal, the accuracy of the live-line information is further improved, and the misjudgment caused by the induced current is avoided. The forward and reverse rotation of the control micro motor is used to block the grounding switch operation hole, so that the risk of closing the grounding knife under live-line condition is avoided. When the to-be-measured cable is live and needs to be forcibly unlocked, the mobile phone is used to send a signal to unlock, which is more safe.

[0059] The application provides a high-voltage grounding switch live-line operation grounding knife blocking device and an anti-misoperation method thereof, the device is used for detecting whether a high-voltage line is live, when the high-voltage line is live, the device blocks a grounding knife operation hole, so that the grounding knife cannot be operated, and when the high-voltage line is not live, the device automatically removes the blocking object of the grounding knife operation hole, so that the grounding knife can be operated, thereby guaranteeing power supply safety.

[0060] According to the ideal embodiments of the application, the above description can be changed and modified in various ways without departing from the technical concept of the application. The technical scope of the application is not limited to the content in the specification, and should be determined according to the scope of claims.

Claims

1. A ground switch live operating ground blade blocking device, characterized by, The utility model relates to a kind of high-voltage cable detection device, including: Power supply circuit, and control circuit, electrification detection circuit, motor drive circuit connected with power supply circuit; The data acquisition port of the control circuit is contacted with the cable to be measured by several groups of electrification detection circuit;The control end of the control circuit is connected with the input end of the motor drive circuit, and the output end of the motor drive circuit is connected with the control end of the motor, and the driving end of the motor is connected with the telescopic rod through the speed reduction mechanism; The output end of the control circuit is also connected with electrification locking output module; The electrification locking output module includes: darlington array control chip connected with control circuit, the port of the darlington array control chip is connected with indicator light circuit and relay control circuit respectively, the indicator light circuit is used to show the detection state of corresponding cable to be measured, the normally closed contact of the output end of the relay control circuit is connected with external device control loop, when high-voltage cable is electrified, the relay contact is disconnected, and the indicator light is bright, indicating that high-voltage cable is electrified;When high-voltage cable is not electrified, the relay contact is closed, and the indicator light is not bright, indicating that high-voltage cable is not electrified, to ensure that the relay remains in closed state when it fails; Several groups of electrification detection circuit include A-phase electrification detection circuit, B-phase electrification detection circuit, C-phase electrification detection circuit, A-phase electrification detection circuit, B-phase electrification detection circuit and C-phase electrification detection circuit are connected with A-phase cable to be measured, C-phase cable to be measured and C-phase cable to be measured on A-phase electrification measurement sensor, B-phase electrification measurement sensor and C-phase electrification measurement sensor respectively in three-phase cable to be measured; A-phase electrification measurement sensor, B-phase electrification measurement sensor and C-phase electrification measurement sensor are all metal sheets, which are wrapped around the surface of the cable to obtain information about whether the internal conductor of the high-voltage cable is electrified, and there is a distributed capacitance C1 between the metal sheet and the internal conductor of the cable and a distributed capacitance C2 between the metal sheet and the ground; When any phase of A, B and C three-phase cable is electrified, the relay contact is disconnected, and when A, B and C three-phase cable are all not electrified, the relay contact is closed.

2. The grounding switch live operating grounding blade blocking device according to claim 1, characterized in that: A-phase electrification detection circuit includes: capacitor C1A and capacitor C2A connected with A-phase electrification measurement sensor, and grounded through capacitor C2A, a node of the series connection of capacitor C1A and capacitor C2A is led out and connected with the inverting input end of double-voltage comparator one, the output end of double-voltage comparator one is connected with the data acquisition port of control circuit, the output end of double-voltage comparator one is also connected with the power supply end of double-voltage comparator one through resistor R2, the power supply end of double-voltage comparator one is grounded through adjusting resistor RP1, and the control end of adjusting resistor RP1 is connected with the positive input end of double-voltage comparator one. The B-phase live wire detection circuit comprises a capacitor C1B and a capacitor C2B connected with a B-phase live wire measurement sensor, and grounded through the capacitor C2B, and a joint node of the capacitor C1B and the capacitor C2B is connected with an inverting input terminal of a dual-voltage comparator two, an output terminal of the dual-voltage comparator two is connected with a data acquisition port of a control circuit, and the output terminal of the dual-voltage comparator two is further connected with a power supply terminal of the dual-voltage comparator two through a resistor R4, the power supply terminal of the dual-voltage comparator two is grounded through an adjusting resistor RP2, and a control terminal of the adjusting resistor RP2 is connected with a forward input terminal of the dual-voltage comparator two. The C-phase live wire detection circuit comprises a capacitor C1C and a capacitor C2C connected with a C-phase live wire measurement sensor, and grounded through the capacitor C2C, and a joint node of the capacitor C1C and the capacitor C2C is connected with an inverting input terminal of a dual-voltage comparator three, an output terminal of the dual-voltage comparator three is connected with a data acquisition port of a control circuit, and the output terminal of the dual-voltage comparator three is further connected with a power supply terminal of the dual-voltage comparator three through a resistor R5, the power supply terminal of the dual-voltage comparator three is grounded through an adjusting resistor RP3, and a control terminal of the adjusting resistor RP3 is connected with a forward input terminal of the dual-voltage comparator three.

3. The grounding switch live operating grounding blade blocking device according to claim 2, characterized in that: The control circuit comprises a single-chip microcomputer control chip, and the single-chip microcomputer control chip is connected with a reset switch and a clock circuit.

4. The grounding switch live operating ground blade blocking device of claim 3, wherein: The power supply circuit comprises a power supply, and the output terminal of the power supply is connected with an input filter capacitor C16 in parallel, one end of the input filter capacitor C16 is grounded, the other end of the input filter capacitor C16 is connected with an input terminal of a linear voltage stabilizer U12, the output terminal of the linear voltage stabilizer U12 serves as a VCC power supply, and the output terminal of the linear voltage stabilizer U12 is grounded through an output filter capacitor C30. The output terminal of the linear voltage stabilizer U12 is connected with an input terminal of a power supply conversion chip U13, the output terminal of the power supply conversion chip U13 serves as a power supply VDD, the input terminal of the power supply conversion chip U13 is grounded through a filter capacitor C19, and the output terminal of the power supply conversion chip U13 is grounded through filter capacitors C18 and C17 connected in parallel.

5. The grounding switch live operating ground blade blocking device of claim 4, wherein: The motor driving circuit comprises one end of a resistor R9 and a resistor R10 connected in parallel and connected with an in pin of the single-chip microcomputer control chip, the other end of the resistor R9 is connected with a base of a triode Q4, an emitter of the triode Q4 is connected with the power supply, the other end of the resistor R10 is connected with a base of a triode Q2, an emitter of the triode Q2 is grounded, a collector of the triode Q4 is connected with one end of a motor U5 at a common point. The other end of the signal shaping trigger connected with the in pin of the single-chip microcomputer control chip is connected with one end of a resistor R11 and a resistor R12 connected in parallel, the other end of the resistor R11 is connected with a base of a triode Q1, an emitter of the triode Q1 is connected with the power supply, the other end of the resistor R12 is connected with a base of a triode Q3, an emitter of the triode Q3 is grounded, a collector of the triode Q1 is connected with the other end of the motor U5 at a common point.

6. The grounding switch live operating ground blade blocking device of claim 5, wherein: The speed reduction mechanism comprises a brushless planetary speed reduction motor lead screw transmission.

7. The grounding switch live operating ground blade blocking device of claim 5, wherein: The single-chip control chip is further connected with a Bluetooth communication module circuit; the Bluetooth communication module circuit comprises a Bluetooth module chip H6 connected with TX and RX pins of the single-chip control chip.

8. A method of preventing misoperation of a ground switch preventing live operating ground blade blocking device, characterized by, The method for preventing misoperation of the grounding switch is realized by the live-line operating grounding switch blocking device of any one of claims 1-7. When the A-phase live-line measurement sensor, the B-phase live-line measurement sensor and the C-phase live-line measurement sensor measure that the three-phase to-be-measured cables have no square wave signals, the three-phase to-be-measured cables are not live, the control circuit sends a command to the motor drive circuit, the motor drive circuit drives the motor to reverse, the telescopic rod is retracted, the telescopic rod exits the grounding switch operating hole, and the grounding switch operating hole is not blocked, so that the grounding switch can be operated at this time, the corresponding indicator lamp of the live-line display circuit is off, and the locking relay contact of the live-line locking output circuit is closed; When the A-phase live-line measurement sensor, the B-phase live-line measurement sensor and the C-phase live-line measurement sensor measure that the three-phase to-be-measured cables have square wave signals, the to-be-measured cables are live, the control circuit sends a command to the motor drive circuit, the motor drive circuit drives the motor to rotate forward, the telescopic rod is extended, the telescopic rod enters the grounding switch operating hole, the grounding switch operating hole of the high-voltage switch cabinet is blocked by the telescopic rod, the grounding switch cannot be operated, the corresponding indicator lamp of the live-line display circuit is on, and the locking relay contact of the live-line locking output circuit is opened; When the to-be-measured cables are live, the grounding switch operating hole is removed.

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