Passive high-voltage live display locking device and distribution network live wire locking anti-misoperation system

Abstract

The application provides a passive high-voltage live display locking device and a distribution network live detection locking anti-misoperation system. The passive high-voltage live display locking device comprises N live indication circuits and a controller, each phase circuit integrates a rectifier circuit, a signal driving circuit and a series connection of a light-emitting diode and a first optocoupler. The signal driving circuit controls the power supply of the components according to the direct current signal, and the controller determines the live state of the high-voltage equipment by collecting the pulse signal frequency output by the first optocoupler. Since the light-emitting diode and the first optocoupler are connected in series, the light signal frequency and the pulse signal frequency are completely synchronized, ensuring the consistency of the physical indication of the light-emitting diode and the digital judgment result of the controller. The application effectively overcomes the defect that the display and the judgment are inconsistent due to the discreteness of the traditional device components, eliminates the hidden danger of misoperation, provides high-reliability live detection locking protection for the intelligent power distribution system, and significantly improves the operation and maintenance safety.

Description

Technical Field

[0001] This application relates to the field of intelligent power distribution systems, and is applicable to high-voltage live display interlocking devices in power distribution switch control equipment such as switchgear and ring main units. It is used to realize reliable perception and mandatory safety interlocking of the live status of high-voltage equipment. Specifically, it relates to passive high-voltage live display interlocking devices and power distribution network voltage detection interlocking anti-misoperation systems. Background Technology

[0002] High-voltage live display and interlocking devices are used to monitor the live status of the high-voltage side of power distribution switch control equipment such as switchgear and ring main units, and output a forced interlocking signal to prevent erroneous operation of the equipment while it is energized. They are key devices to ensure the safety of power distribution network operation and maintenance.

[0003] Traditional devices determine whether the power distribution switch control equipment is energized by the flashing signal of the indicator light. This may be inconsistent with the controller's determination of whether the power distribution switch control equipment is energized by the sensor signals received. This may lead to operators misjudging the energized status of the equipment, causing the power distribution network anti-misoperation system to lose its correct judgment basis, thus creating safety hazards in critical operations such as equipment maintenance and grounding.

[0004] As power systems transition towards intelligent and unmanned operation, the shortcomings of traditional devices severely restrict the reliability and safety of intelligent distribution switch control equipment. Therefore, there is an urgent need for a new type of high-voltage live-line display interlocking device to meet the higher requirements of intelligent distribution systems for safety perception and prevention of misoperation. Summary of the Invention

[0005] This application provides a passive high-voltage live display interlocking device and a distribution network voltage detection interlocking anti-misoperation system to reduce the inconsistency between the live status displayed by the indicator light and the digital judgment result of the controller.

[0006] In a first aspect, this application provides a passive high-voltage live display interlocking device, comprising: N live indication circuits and a controller, wherein the value of N is the same as the number of phases of the internal power supply of the high-voltage equipment; each live indication circuit corresponds to one phase; each live indication circuit is used to receive a sensor signal, the sensor signal being a signal obtained by monitoring the corresponding phase power; each live indication circuit includes a first rectifier circuit, a signal driving circuit, and a signal component; wherein the signal component includes a light-emitting diode and a first optocoupler connected in series; the first rectifier circuit is used to receive the corresponding sensor signal and convert the sensor signal into a DC signal output; the signal driving circuit is used to control whether to supply power to the signal component based on the DC signal; when the signal driving circuit supplies power to the signal component, the light-emitting diode is turned on and emits a light signal to indicate whether the corresponding phase power of the high-voltage equipment is live; simultaneously, the first optocoupler outputs a first pulse signal; the controller is used to determine whether the high-voltage equipment is live based on N first pulse signals; the frequency of the light signal is consistent with the frequency of the first pulse signal to ensure that the light emission indication of the light-emitting diode is consistent with the judgment result of the controller.

[0007] In this embodiment, the signal driving circuit controls whether to supply power to the signal component based on a DC signal, thereby enabling the light signal emitted by the LED to reflect whether a corresponding phase is charged. Since the LED and the first optocoupler are connected in series, when the LED is turned on, the first optocoupler also turns on, making the frequency of the light signal consistent with the frequency of the first pulse signal. This reduces the likelihood of inconsistencies between the controller's determination of whether a target is charged based on the received first pulse signal and the determination based on the LED's light signal.

[0008] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the signal driving circuit includes: an energy storage capacitor, a bleeder circuit, and a bidirectional trigger diode; the first terminal of the energy storage capacitor, the first terminal of the bleeder circuit, and the first terminal of the bidirectional trigger diode are all connected to the positive terminal of the DC signal output of the first rectifier circuit; the second terminal of the energy storage capacitor and the second terminal of the bleeder circuit are both connected to the negative terminal of the DC signal output of the first rectifier circuit; the second terminal of the bidirectional trigger diode is connected to the negative terminal of the DC signal output of the first rectifier circuit through the signal component.

[0009] In this embodiment, the energy storage capacitor is charged using a DC signal. Power is supplied to the signal component only when the voltage of the energy storage capacitor is greater than or equal to the forward voltage of the bidirectional trigger diode. The larger the current of the DC signal, the larger the phase voltage of the corresponding phase, which means the energy storage capacitor is charged faster, resulting in a higher frequency of power supply to the signal component. This allows the frequency of the light-emitting diode's light signal and the frequency of the first pulse signal to reflect whether the corresponding phase is charged.

[0010] The bleeder circuit is designed to divert a specified proportion of the current in the DC signal, ensuring that when the DC signal is below this specified proportion, the energy storage capacitor will not continuously charge, preventing the voltage from rising above the turn-on voltage of the bidirectional trigger diode. In other words, when the DC signal is below this specified proportion, the bidirectional trigger diode will not conduct, reducing the possibility of false alarms. Conversely, when the bidirectional trigger diode is conducting, the bleeder circuit can also divert a specified proportion of the current in the DC signal, improving the safety of this design.

[0011] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the signal component further includes: a first current-limiting resistor; the light-emitting diode, the first optocoupler, and the first current-limiting resistor are connected in series.

[0012] In this embodiment, by setting a first current-limiting resistor, the current flowing through the signal component can be reduced when powering the signal component, thereby reducing the possibility of the signal component being burned out by a large current and improving the safety of this solution.

[0013] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the leakage circuit includes: M leakage branches; the first end of each leakage branch is connected to the positive terminal of the DC signal output of the first rectifier circuit, and the second end of each leakage branch is connected to the negative terminal of the DC signal output of the first rectifier circuit; wherein, the resistance values ​​of different leakage branches are different, and at least M-1 leakage branches include switches, the switches being used to control the conduction and disconnection of the leakage branch.

[0014] In this embodiment of the application, by setting the conduction status of different leakage branches, this solution can be applied to a variety of different sensor signals (that is, the current magnitude of the sensor signals is different), thereby improving the applicability of this solution.

[0015] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the switch is a DIP switch or a jumper.

[0016] In this embodiment, using a DIP switch or jumper as a switch makes it easier to select the current leakage branch in the current leakage circuit.

[0017] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the leakage circuit includes four leakage branches to cover the sensor signal current range of 7uA to 300uA, and satisfies the energization indication threshold of 26% to 69% of the phase voltage of the phase current; wherein, the number of leakage branches satisfies (69 / 26). x With a current ratio of ≥300 / 7, a sensor signal current range of 7uA to 300uA is achieved, and the live indication threshold is 26%~69% of the phase voltage of the phase current; 69 / 26 is the dynamic multiple corresponding to 26%~69% of the phase voltage of the phase current; 300 / 7 is the ratio of the upper limit to the lower limit of the sensor signal current range; x is the number of bleeder branches included in the bleeder circuit; and 4 is the value of x satisfying (69 / 26). x The minimum value of ≥300 / 7.

[0018] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the four bleeder branches correspond to one of the following current ranges: small current range, medium-small current range, medium-large current range, and large current range. The current ranges corresponding to the small current range, medium-small current range, medium-large current range, and large current range are 7uA~18uA, 18uA~46uA, 46uA~118uA, and 118uA~300uA, respectively. The bleeder current corresponding to each current range is 26% of the upper limit current of that current range, which is approximately 4.7uA, 12uA, 30.7uA, and 78uA, respectively.

[0019] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, when the breakdown voltage of the bidirectional trigger diode is 30V, the resistance values ​​of the four bleeder branches are as follows: the resistance value of the bleeder branch corresponding to the small current range is approximately 6.4MΩ, the resistance value of the bleeder branch corresponding to the medium-small current range is approximately 2.5MΩ, the resistance value of the bleeder branch corresponding to the medium-large current range is approximately 0.98MΩ, and the resistance value of the bleeder branch corresponding to the large current range is approximately 0.39MΩ.

[0020] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the controller includes N signal receiving ports, one of which is connected to the output terminal of a first optocoupler in the energized indicator circuit; the controller is used to obtain the monitoring result of whether each phase is energized based on the frequency of the N first pulse signals.

[0021] In this embodiment, since the controller can independently receive each first pulse signal, each received first pulse signal can be processed separately, thereby achieving the effect of identifying whether each phase of the N-phase electricity is energized, and thus obtaining the monitoring result of whether each phase of the monitored electricity is energized.

[0022] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the passive high-voltage live display interlocking device further includes: an interlocking output circuit; correspondingly, the signal component further includes a second optocoupler, the light-emitting diode, the first optocoupler and the second optocoupler are connected in series; the signal output terminal of the second optocoupler is used to output a control signal; the interlocking output circuit is used to control the opening and closing of the target circuit in response to N control signals.

[0023] In this embodiment, the interlocking output circuit is controlled by the second optocoupler outputting a control signal in the signal component, thereby controlling the opening and closing of the target circuit. This achieves a reliable interlocking / unlocking function. Furthermore, since the control signal is output through the second optocoupler, electrical isolation can be achieved between other circuit structures in the passive high-voltage live-line display interlocking device (such as the live-line indicator circuit and controller circuit structures) and the target circuit, preventing strong currents in the target circuit from impacting other circuit structures in the passive high-voltage live-line display interlocking device.

[0024] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the interlocking output circuit includes: a second rectifier circuit, a first filter capacitor, a pull-up resistor, a switching transistor, a voltage regulator filter circuit, and a third current-limiting resistor; the first AC input terminal of the second rectifier circuit is used to connect to the first terminal of the target circuit, and the second AC input terminal of the second rectifier circuit is used to connect to the second terminal of the target circuit; the positive DC signal output terminal of the second rectifier circuit is connected to the first terminal of the switching transistor; the positive DC signal output terminal of the second rectifier circuit is also connected to the first terminal of the pull-up resistor through the voltage regulator filter circuit; the second terminal of the pull-up resistor is connected to the control terminal of the switching transistor, the control terminal of the switching transistor is connected to the first terminal of the third current-limiting resistor and the first terminal of the first filter capacitor, respectively, and the second terminal of the switching transistor is connected to the negative DC signal output terminal of the second rectifier circuit and the second terminal of the first filter capacitor; the second terminal of the third current-limiting resistor is connected to the signal output terminal of the second optocoupler in each of the N energized indicator circuits.

[0025] In this embodiment, when the switching transistor is off, current cannot flow between the first and second AC input terminals of the second rectifier circuit, thus disconnecting the target circuit (if the target circuit is an electromagnetic lock power supply circuit supplying power to the electromagnetic lock, the electromagnetic lock cannot operate at this time). When the switching transistor is on, current can flow between the first and second AC input terminals of the second rectifier circuit, making the target circuit on (if the target circuit is an electromagnetic lock power supply circuit supplying power to the electromagnetic lock, the electromagnetic lock can operate at this time). The first filter capacitor can both filter the control signal input to the switching transistor and act as an energy storage capacitor, maintaining the switching transistor in a conducting or off state between two adjacent segments of the control signal used to indicate the switching transistor's on state (the specific holding time is determined by the charging and discharging time of the first filter capacitor).

[0026] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the voltage stabilizing filter circuit includes: a second current-limiting resistor, a Zener diode, and a second filter capacitor; the first end of the second current-limiting resistor is connected to the positive terminal of the DC signal output of the second rectifier circuit, and the second end of the second current-limiting resistor is connected to the first end of the second filter capacitor, the cathode of the Zener diode, and the first end of the pull-up resistor, respectively; the second end of the second filter capacitor and the anode of the Zener diode are both connected to the negative terminal of the DC signal output of the second rectifier circuit.

[0027] In this embodiment, the second current-limiting resistor reduces the current magnitude and improves safety. The second filter capacitor filters the current output from the second rectifier circuit, improving current stability. Therefore, a stable low-voltage DC voltage can be obtained through the second current-limiting resistor, the Zener diode, and the filter rectifier diode.

[0028] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the voltage stabilizing filter circuit further includes: a filter rectifier diode; the second end of the second current limiting resistor is connected to the first end of the pull-up resistor through the filter rectifier diode.

[0029] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the passive high-voltage live display interlocking device further includes: a computer key interface circuit; the computer key interface circuit is used to receive the monitoring result sent by the controller indicating whether the high-voltage equipment is energized, and to send the monitoring result to the computer key.

[0030] In this embodiment of the application, by setting a computer key interface circuit, the controller can send the monitoring results to the computer key through the computer key interface circuit.

[0031] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the computer key interface circuit includes: a power supply circuit and a communication circuit; the power supply circuit is connected to the power supply terminal of the controller, and the power supply circuit is used to provide operating power to the controller; the input terminal of the communication circuit is connected to the signal output terminal of the controller; the communication circuit is used to receive and send the monitoring results output by the controller.

[0032] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the passive high-voltage live display interlocking device further includes: N voltage sensors; each voltage sensor is connected to one of the first rectifier circuits, and each voltage sensor is used to monitor the voltage of one phase of electricity within the high-voltage equipment.

[0033] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the passive high-voltage live display interlocking device further includes N sensor signal interfaces and a phase comparison interface; a voltage sensor is connected to a first rectifier circuit through a sensor signal interface; the phase comparison interface is connected to each of the sensor signal interfaces, and the phase comparison interface is used to receive the sensor signal sent by each of the sensor signal interfaces and send the sensor signal to the phase comparison device.

[0034] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the passive high-voltage live display interlocking device further includes: an interlocking output port, which is connected to the output terminal of the interlocking output circuit, and the interlocking output port is used to connect to the target circuit.

[0035] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the passive high-voltage live display interlocking device further includes: a computer key interface, which is connected to the computer key interface circuit and the power supply circuit.

[0036] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the passive high-voltage live display interlocking device further includes: a housing; N live indicator circuits, a controller, and an interlocking output circuit are disposed inside the housing, and the N optical signals used to indicate whether the device is live can be emitted to the outside of the housing; the phase interface, the computer key interface, and the interlocking output port are exposed on the surface of the housing.

[0037] Secondly, this application provides a power distribution network voltage detection interlocking anti-misoperation system, comprising: a passive high-voltage live display interlocking device as described in the first aspect above, an unlocking device, a server, and at least one first lock; the server is used to send a task to the unlocking device; the unlocking device is communicatively connected to the passive high-voltage live display interlocking device to obtain the voltage detection result; the unlocking device is configured to have unlocking authority for the target first lock when the voltage detection result indicates no voltage and a task to unlock the target first lock is received; when the unlocking device has the unlocking authority, the unlocking device is communicatively connected to the target first lock to unlock the target first lock.

[0038] In conjunction with the technical solution provided in the second aspect above, in some possible implementations, the passive high-voltage live-line display interlocking device, as described in the first aspect above, and the distribution network voltage detection interlocking anti-misoperation system, further include a second lock; the second lock is connected to the interlocking output circuit of the passive high-voltage live-line display interlocking device; the interlocking output circuit controls the opening and closing of the circuit in the second lock; when the circuit in the second lock is open, the second lock is in an inoperable state; when the circuit in the second lock is closed, the second lock is in an operable state.

[0039] The embodiments of the present invention bring the following beneficial effects:

[0040] (1) By directly connecting the light-emitting diode in series with the first optocoupler used for controller judgment, the frequency of the light signal is synchronized with that of the first pulse signal, ensuring that the live indication (the light signal emitted by the light-emitting diode) observed by the naked eye is consistent with the digital voltage detection judgment result performed by the controller, thereby improving the reliability of the digital voltage detection judgment result performed by the controller.

[0041] (2) The current matching component is eliminated, and the current range is set by DIP switch or jumper, so as to realize "plug and play" on-site commissioning without the need for on-site calibration, which greatly reduces material costs and commissioning complexity, making the intelligent power distribution switch control equipment easier to deploy, maintain and upgrade.

[0042] (3) The optocoupler isolation design greatly improves the protection level of the internal circuit (live indicator circuit, controller, etc.) of the passive high voltage live display interlocking device, enabling it to effectively resist external strong electric shocks and ensure long-term stable operation under complex working conditions, providing high reliability guarantee for the unattended safe operation of intelligent switch cabinets, ring network cabinets and other intelligent power distribution switch control equipment. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of a first type of passive high-voltage live display interlocking device shown in an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of a first type of live indicator circuit shown in an embodiment of this application;

[0046] Figure 3 This is a schematic diagram of a second type of live indicator circuit shown in an embodiment of this application;

[0047] Figure 4 This is a schematic diagram of a third type of live indicator circuit shown in an embodiment of this application;

[0048] Figure 5 This is a schematic diagram of a second type of passive high-voltage live display interlocking device shown in an embodiment of this application;

[0049] Figure 6 This is a schematic diagram of a first type of interlocking output circuit shown in an embodiment of this application;

[0050] Figure 7 This is a schematic diagram of a second type of interlocking output circuit shown in an embodiment of this application;

[0051] Figure 8 This is a schematic diagram of a third interlocking output circuit shown in an embodiment of this application;

[0052] Figure 9 This is a schematic diagram of the third type of passive high-voltage live display interlocking device shown in the embodiments of this application;

[0053] Figure 10 This is a schematic diagram of the fourth passive high-voltage live display interlocking device shown in the embodiments of this application;

[0054] Figure 11 This is a structural block diagram of the fifth type of passive high-voltage live display interlocking device shown in the embodiments of this application;

[0055] Figure 12 This is a structural block diagram of a power distribution network voltage detection interlocking anti-misoperation system shown in an embodiment of this application;

[0056] Figure 13 This is a schematic diagram illustrating the connection between a second lock and a passive high-voltage live display locking device, as shown in an embodiment of this application.

[0057] Figure reference numerals: ZD1 - First rectifier diode; ZD2 - Second rectifier diode, ZD3 - Third rectifier diode, ZD4 - Fourth rectifier diode; K1 - First switch; K2 - Second switch; K3 - Third switch; R11 - First bleeder resistor; R12 - Second bleeder resistor; R13 - Third bleeder resistor; R14 - Fourth bleeder resistor; C1 - Energy storage capacitor; SD1 - Bidirectional trigger diode; R4 - First current limiting resistor; LED1 - Light emission diode; U4 - First optocoupler; U1 - Second optocoupler; R1 - Protection resistor; C5 - First filter capacitor; R8 - Pull-up resistor; G1 - Switching transistor; R7 - Third current limiting resistor; R9 - Second current limiting resistor; Z1 - Zener diode; C4 - Second filter capacitor; D1 - Filter rectifier diode; BD4 - Second rectifier circuit; ZD5 - Fifth rectifier diode; ZD6 - Sixth rectifier diode; ZD7 - Seventh rectifier diode; ZD8 - Eighth rectifier diode; 10 - Passive high-voltage live display interlocking device; 100 - Live indicator circuit; 110 - First rectifier circuit; 120 - Signal drive circuit; 121 - Leakage circuit; 130 - Signal component; 200 - Controller; 300 - Interlocking output circuit; 310 - Voltage stabilizing filter circuit; 400 - Computer key interface circuit; 410 - Communication circuit; 420 - Power supply circuit; 500 - Computer key interface; 600 - Interlocking output port; 700 - Voltage sensor; 800 - Phase interface; 900 - Sensor signal interface; 20 - Unlocking device; 21 - Unlocker; 22 - Local anti-misoperation unit; 30 - Server; 40 - First lock; 50 - Second lock; 51 - Electromagnetic lock power supply circuit; 52 - Electromagnetic lock body. Detailed Implementation

[0058] The terms “first,” “second,” “third,” etc., are used only for distinguishing descriptions and do not indicate a sequence number, nor should they be interpreted as indicating or implying relative importance.

[0059] In the description of this application, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” shall be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components.

[0060] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings.

[0061] In existing high-voltage live display devices used for high-voltage detection, the flashing indicator and ADC (Analog-to-Digital Converter) sampling are two independent paths, which may cause the live status displayed by the indicator light to be inconsistent with the digital determination result of the controller.

[0062] Furthermore, existing devices require precision resistors and current matching components to achieve ADC sampling, increasing material costs and debugging complexity. They also cannot be calibrated when there is no high voltage on site and require secondary calibration after commissioning. The MCU circuit lacks electrical isolation and is easily damaged by strong electric shocks. It cannot aggregate signals to drive interlocking outputs, thus limiting its functionality.

[0063] In order to solve the technical problems of existing high-voltage live display devices, this application provides a passive high-voltage live display interlocking device.

[0064] Please see Figure 1 , Figure 1 This is a schematic diagram of a passive high-voltage live display interlocking device shown in this application. Figure 1 As shown, the passive high-voltage live display interlocking device includes N live indicator circuits 100 and a controller 200.

[0065] The value of N is the same as the number of phases of the electrical circuit in the high-voltage equipment, and N is a positive integer.

[0066] For example, if the high-voltage equipment to be monitored has three-phase power, then the value of N is 3. This means the passive high-voltage live-line display and interlocking device includes a controller 200 and three live-line indicator circuits 100. This example is for ease of understanding only; the value of N is not limited to the example presented here.

[0067] Each energized indicator circuit 100 corresponds to a phase current. Each energized indicator circuit 100 is used to receive a sensor signal, which is a signal obtained by monitoring the corresponding phase current.

[0068] Different types of electrical phases have different phases. For example, three-phase electricity includes three different types of electrical phases, each with a different phase.

[0069] For example, if N=3, meaning it includes phase A, phase B, and phase C, then there are three energizing circuits: a first energizing circuit, a second energizing circuit, and a third energizing circuit. The first energizing circuit corresponds to phase A, the second to phase B, and the third to phase C. Therefore, the first energizing circuit receives the sensor signal from monitoring phase A, the second receives the sensor signal from monitoring phase B, and the third receives the sensor signal from monitoring phase C. This example is for illustrative purposes only and should not be construed as limiting the scope of this application.

[0070] Each energized indicator circuit 100 includes: a first rectifier circuit 110, a signal drive circuit 120, and a signal component 130. The signal component 130 includes a light-emitting diode and a first optocoupler connected in series. For easier understanding, please refer to [link to relevant documentation]. Figure 1 .

[0071] The first rectifier circuit 110 is used to receive the corresponding sensor signal and convert the sensor signal into a DC signal output. The sensor signal corresponding to the first rectifier circuit 110 is the sensor signal received by the live indicator circuit 100.

[0072] For example, in the case of three-phase power, the sensor signal is obtained by monitoring one of the three phases. In this case, there will be three sensor signals, and three energized indicator circuits 100 will each receive one of the sensor signals.

[0073] In one implementation, the specific structure of the first rectifier circuit 110 is as follows: Figure 2 As shown. The first rectifier circuit 110 includes a first rectifier diode ZD1, a second rectifier diode ZD2, a third rectifier diode ZD3, and a fourth rectifier diode ZD4.

[0074] The anode of the first rectifier diode ZD1 is used to receive a sensor signal. The cathode of the first rectifier diode ZD1 is connected to the cathode of the second rectifier diode ZD2, and the cathode of the first rectifier diode ZD1 is also connected to one end of the signal driving circuit 120 used to receive the sensor signal.

[0075] The anode of the second rectifier diode ZD2 is connected to the cathode of the third rectifier diode ZD3.

[0076] The anode of the third rectifier diode ZD3 is connected to the anode of the fourth rectifier diode ZD4. The anode of the third rectifier diode ZD3 is also connected to the other end of the signal driving circuit 120, so that the signal driving circuit 120 forms a complete loop.

[0077] The cathode of the fourth rectifier diode ZD4 is connected to the anode of the first rectifier diode.

[0078] in, Figure 2 In the first rectifier circuit 110 shown, the anode of the first rectifier diode ZD1 is the AC signal input terminal, the cathode of the first rectifier diode ZD1 is the DC signal output positive terminal, the anode of the second rectifier diode ZD2 is the AC signal output terminal, and the anode of the third rectifier diode ZD3 is the DC signal output negative terminal. Figure 2 The grounding shown refers to the grounding of AC signals.

[0079] Optionally, in practical applications, the first rectifier circuit 110 can be a packaged circuit corresponding to a bridge rectifier circuit.

[0080] The signal driving circuit 120 is used to control whether to supply power to the signal component 130 based on a DC signal. When the signal driving circuit 120 supplies power to the signal component 130, the light-emitting diode is turned on to emit a light signal to indicate whether the corresponding phase of the high-voltage equipment is energized.

[0081] The first optocoupler outputs a first pulse signal, and the frequency of the optical signal is consistent with the frequency of the first pulse signal. This ensures that the electrical indication observed by the naked eye (the light signal emitted by the light-emitting diode) is consistent with the digital voltage detection result performed by the controller, improving the reliability of the digital voltage detection result performed by the controller and meeting the higher safety perception requirements of intelligent power distribution systems.

[0082] In one implementation, such as Figure 3 As shown, the signal driving circuit 120 includes an energy storage capacitor C1, a current leakage circuit 121, and a bidirectional trigger diode SD1.

[0083] The first terminal of the energy storage capacitor C1, the first terminal of the bleeder circuit 121, and the first terminal of the bidirectional trigger diode SD1 are all connected to the positive terminal of the DC signal output of the first rectifier circuit 110.

[0084] The second terminal of the energy storage capacitor C1 and the second terminal of the bleeder circuit 121 are both connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0085] The second terminal of the bidirectional trigger diode SD1 is connected to the negative terminal of the DC signal output of the first rectifier circuit 110 through the signal component 130.

[0086] The specific type and model of the energy storage capacitor C1 can be selected according to actual needs, as long as the limiting voltage of the energy storage capacitor is greater than the conduction voltage of the bidirectional trigger diode.

[0087] The specific type and model of the bidirectional trigger diode SD1 can be selected according to actual needs, and there is no restriction on its specific type here.

[0088] In one embodiment, the bleeder circuit 121 may include a bleeder resistor, the first end of which is connected to the positive terminal of the DC signal output of the first rectifier circuit 110. The second end of the bleeder resistor is connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0089] In one embodiment, the bleeder circuit 121 may also include M bleeder branches. The first end of each bleeder branch is connected to the positive terminal of the DC signal output of the first rectifier circuit 110, and the second end of each bleeder branch is connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0090] The resistance values ​​of different leakage branches are different, and at least M-1 leakage branches include switches, which are used to control the conduction and disconnection of their respective leakage branches. M is a positive integer greater than or equal to 2.

[0091] The bleed branch excluding the switch includes a bleed resistor, which is connected in the same way as the bleed resistor described above. For the sake of brevity, it will not be repeated here.

[0092] A bleeder branch that includes a switch comprises a bleeder resistor and a switch. The bleeder resistor and the switch are connected in series so that the switch controls the conduction and disconnection of this bleeder branch.

[0093] Specifically, the first end of the bleeder resistor can be connected to the positive terminal of the DC signal output of the first rectifier circuit 110. The second end of the bleeder resistor can be connected to the first end of the switch, and the second end of the switch can be connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0094] Alternatively, the first terminal of the switch can be connected to the positive terminal of the DC signal output of the first rectifier circuit 110. The second terminal of the switch can be connected to the first terminal of the bleeder resistor, and the second terminal of the bleeder resistor can be connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0095] In this design, multiple bleeder branches with different resistance values ​​are used to make the design applicable to a wider range of sensor signals (i.e., the range of current values ​​of the sensor signals). By controlling the on and off states of different bleeder branches, the energized indicator circuit 100 can be adapted to sensor signals with different current ranges.

[0096] Optionally, the bleeder circuit may include four bleeder circuits to cover the sensor signal current range of 7uA to 300uA and meet the live indication threshold of 26% to 69% of the phase voltage of the phase.

[0097] The number of outflow branches satisfies (69 / 26). x With a current rating of ≥300 / 7, it can cover the sensor signal current range of 7uA to 300uA and meet the requirement that the live indication threshold is 26% to 69% of the phase voltage of the phase.

[0098] 69 / 26 is the dynamic multiple corresponding to 26%~69% of the phase voltage of the phase current, 300 / 7 is the ratio of the upper limit to the lower limit of the sensor signal current range, x is the number of bleeder branches included in the bleeder circuit, and 4 is the value of x satisfying (69 / 26). x The minimum value of ≥300 / 7.

[0099] Optionally, the four bleeder branches correspond to one of the following current ranges: low current, medium-low current, medium-high current, and high current. The current ranges corresponding to the low current, medium-low current, medium-high current, and high current ranges are 7uA~18uA, 18uA~46uA, 46uA~118uA, and 118uA~300uA, respectively.

[0100] The discharge current corresponding to each current level is 26% of the upper limit current of that current level, which is approximately 4.7uA, 12uA, 30.7uA and 78uA respectively.

[0101] Optionally, with the breakdown voltage of the bidirectional trigger diode at 30V, the resistance values ​​of the four bleeder branches are as follows: approximately 6.4MΩ for the bleeder branch corresponding to the small current range, approximately 2.5MΩ for the bleeder branch corresponding to the medium-small current range, approximately 0.98MΩ for the bleeder branch corresponding to the medium-large current range, and approximately 0.39MΩ for the bleeder branch corresponding to the large current range.

[0102] For example, taking the requirement of being able to handle sensor signals ranging from 7 to 300 µA as an example, the dynamic range corresponding to 7 to 300 µA is approximately 300 / 7 ≈ 43 times. The DL / T 538 standard requires the energization indication threshold (i.e., the activation threshold, referring to the critical value for verifying whether the equipment is energized under specified test conditions) to be 26% to 69% of the phase voltage of the phase, which translates to a dynamic range of approximately 69 / 26 ≈ 2.65 times. Therefore, to meet the standard threshold and cover the entire current range, a dynamic range of 2.65 is required. x ≥43, rounded down, gives x≥4, meaning 4 different gears are needed, with the dynamic multiplier within each gear being approximately 43. 1 / 4 The value is approximately 2.56 times, which meets the standard requirement of 2.65 times. This means that four drainage branches need to be installed. These can also be configured with three or five levels, and the specific method is similar to the four-level method. For ease of understanding, the following explanation uses a four-level method as an example.

[0103] For the four speed settings, the corresponding current ranges are approximately: 7-18uA (low current setting), 18-46uA (low to medium current setting), 46-118uA (medium to high current setting), and 118-300uA (high current setting).

[0104] The bleeder circuit 121 is designed to divert a specified proportion of the current in the DC signal when the bidirectional trigger diode is not conducting, ensuring that when the DC signal is less than this specified proportion, the energy storage capacitor will not continue to charge, causing the voltage to rise above the conduction voltage of the bidirectional trigger diode. If the sensor's output current flows entirely through the live indicator circuit 100 without loss, the current that needs to be bleed for each setting is 18uA. 26% ≈ 4.7 uA (low current range); 46 uA 26% ≈ 12 uA (small to medium current range); 118 uA 26% ≈ 30.7uA (medium to high current range); 300uA 26%≈78uA (high current range). In actual circuits, there will be some current loss. The current of the lost part can be directly used as part of the discharge current for calculation, and the breakdown voltage can also be calculated by substituting the actual value. The calculation principle is not affected.

[0105] If the breakdown voltage of the live indicator circuit 100 is 30V, then the resistance values ​​of the discharge resistors corresponding to each range are as follows: 30V / 4.7 uA≈6.4MΩ (small current range); 30V / 12 uA≈2.5MΩ (small to medium current range); 30V / 30.7uA≈0.98MΩ (medium to large current range); 30V / 78uA≈0.39MΩ (large current range).

[0106] If each bleed branch includes a switch, then the resistance values ​​of the bleed resistors included in the four bleed branches are 6.4MΩ, 2.5MΩ, 0.98MΩ, and 0.39MΩ, respectively.

[0107] If only three of the four leakage branches include switches (the first switch K1, the second switch K2, and the third switch K3), and the remaining leakage branch only includes the first discharge resistor R11, then... Figure 4 As shown, in the low current range, there is only one bleeder branch (excluding the bleeder branch of the switch) for bleeding, so R11≈6.4MΩ.

[0108] In the case of small to medium current ranges, R11 and R12 are connected in parallel to jointly discharge current. Therefore, R11... R12 / (R11+R12)≈2.5MΩ, so R12≈4.1MΩ.

[0109] In medium to high current applications, R11 and R13 are connected in parallel to discharge current together. Therefore, R11... R13 / (R11+R13)≈0.98MΩ, therefore R13≈1.16MΩ.

[0110] In high current applications, R11 and R13 are connected in parallel to discharge current together. Therefore, R11... R14 / (R11+R14)≈0.39MΩ, therefore R14≈0.42MΩ.

[0111] Based on this, the resistance value of the discharge resistor included in each discharge branch is obtained.

[0112] Optionally, after calculating the required resistance value of the discharge resistor for each discharge branch, when actually producing the circuit, a resistor from a standard resistance series that is closest to the calculated resistance value can be selected for easier procurement.

[0113] Alternatively, the required resistance value can be achieved by combining multiple resistors in series and parallel. In this case, the bleeder resistor includes multiple resistors in series and parallel.

[0114] Optionally, the switch can be a DIP switch or a jumper.

[0115] When the switch is a DIP switch, in actual use, the conduction and disconnection of different leakage branches can be adjusted by toggling the switch handle.

[0116] When the switch is a jumper, in actual use, the bleed branch is connected by an external jumper (or jumper cap, shorting piece, etc.), thus making the bleed branch connected to the jumper conductive. The bleed branch without a jumper connected is in an open state. In this case, the jumper position needs to be preset.

[0117] The setting can be preset to the minimum current level, and the level can be adjusted according to actual needs during subsequent use.

[0118] This design, which replaces traditional replaceable components with DIP switches or jumpers, greatly simplifies the on-site configuration process. For large-scale smart distribution networks, this feature significantly reduces the complexity and cost of on-site commissioning, operation, and subsequent maintenance of smart switchgear, ring main units, and other equipment, enabling convenient operation and maintenance without opening the casing or high-voltage calibration, which meets the core requirement of intelligent power distribution systems for efficient operation and maintenance.

[0119] In one embodiment, the signal component 130 further includes a first current-limiting resistor. The light-emitting diode, the first optocoupler, and the first current-limiting resistor are connected in series. By setting the first current-limiting resistor, the current flowing through the signal component 130 can be reduced when power is supplied to the signal component 130, thereby reducing the possibility of the signal component 130 being burned out by a large current and improving the safety of this solution.

[0120] The specific value of the first current-limiting resistor can be selected according to actual needs, and its specific value is not restricted here.

[0121] The connection order of the light-emitting diode, the first optocoupler, and the first current-limiting resistor can be set according to actual needs. For example, the second terminal of the bidirectional trigger diode can be connected to the anode of the light-emitting diode through the first current-limiting resistor. The cathode of the light-emitting diode is connected to the anode of the first optocoupler. The cathode of the first optocoupler is connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0122] Alternatively, the second terminal of the bidirectional trigger diode can be connected to the anode of the LED. The cathode of the LED is connected to the anode of the first optocoupler through the first current-limiting resistor. The cathode of the first optocoupler is connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0123] Alternatively, the second terminal of the bidirectional trigger diode can be connected to the anode of the first optocoupler. The cathode of the first optocoupler is connected to the anode of the light-emitting diode. The cathode of the light-emitting diode is connected to the negative terminal of the DC signal output of the first rectifier circuit 110 through the first current-limiting resistor.

[0124] The example provided here is for illustrative purposes only, and the connection order between the light-emitting diode, the first optocoupler, and the first current-limiting resistor is not limited to the example provided here.

[0125] The controller 200 is used to determine whether the high-voltage equipment is energized based on N first pulse signals, wherein the power supply system is used to supply power to the high-voltage equipment.

[0126] The controller 200 can be an integrated circuit chip with signal processing capabilities. For example, it can be an MCU (Microcontroller Unit), CPU (Central Processing Unit), NP (Network Processor), etc.; it can also be a DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0127] In one implementation, the controller 200 may include only one signal receiving port, which is connected to the signal output terminal of the first optocoupler in each energized indicator circuit 100 for outputting a first pulse signal.

[0128] Alternatively, the controller 200 may include N signal receiving ports, one of which is connected to the output of a first optocoupler in a energized indicator circuit 100. In this case, the controller 200 is specifically used to obtain a monitoring result of whether each phase is energized based on the frequencies of the N first pulse signals.

[0129] Since the controller 200 can independently receive each first pulse signal, it can process each received first pulse signal separately, thereby achieving the effect of identifying whether each phase of the N-phase electricity is energized, and thus obtaining the monitoring result of whether each phase of the monitored electricity is energized.

[0130] The controller 200 can accurately determine the energization state of each phase by independently acquiring the pulse frequency of each phase and performing hysteresis comparison. This direct and reliable determination mechanism improves the accuracy of the determination results obtained by the controller 200.

[0131] In one embodiment, the passive high-voltage live display interlocking device further includes an interlocking output circuit. Correspondingly, the signal component 130 also includes a second optocoupler, with the light-emitting diode, the first optocoupler, and the second optocoupler connected in series; the signal output terminal of the second optocoupler is used to output a control signal. For ease of understanding, as... Figure 5 As shown.

[0132] The interlocking output circuit 300 is used to control the opening and closing of the target circuit in response to N control signals.

[0133] The target circuit can be the power supply circuit of an electronic control device. For example, it could be the power supply circuit of an electromagnetic lock, and the specific type can be selected according to actual needs, and is not limited to the examples given here.

[0134] The control signal output by the second optocoupler in signal component 130 controls the interlocking output circuit 300, achieving the effect of controlling the opening and closing of the target circuit. This provides a reliable interlocking / unlocking function. Furthermore, because the control signal is output through the second optocoupler, electrical isolation can be achieved between other circuit structures in the passive high-voltage live-line display interlocking device (such as the live-line indicator circuit 100 and the controller 200) and the target circuit, preventing strong currents in the target circuit from impacting other circuit structures in the passive high-voltage live-line display interlocking device.

[0135] In this configuration, when the signal component 130 also includes a first current-limiting resistor, the first current-limiting resistor, the light-emitting diode (LED), the first optocoupler, and the second optocoupler are connected in series. The connection order of the first current-limiting resistor, the LED, the first optocoupler, and the second optocoupler can be set according to actual needs. For example, the second terminal of the bidirectional trigger diode can be connected to the anode of the LED through the first current-limiting resistor. The cathode of the LED is connected to the anode of the first optocoupler. The cathode of the first optocoupler is connected to the anode of the second optocoupler, and the cathode of the second optocoupler is connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0136] Alternatively, the second terminal of the bidirectional trigger diode can be connected to the anode of the LED. The cathode of the LED is connected to the anode of the second optocoupler through the first current-limiting resistor. The cathode of the second optocoupler is connected to the anode of the first optocoupler. The cathode of the first optocoupler is connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0137] The example provided here is for illustrative purposes only, and the connection order between the LED, the first optocoupler, the second optocoupler, and the first current-limiting resistor is not limited to the example provided here.

[0138] In one implementation, such as Figure 6 As shown, the interlocking output circuit 300 may include a second rectifier circuit, a first filter capacitor C5, a pull-up resistor R8, a switching transistor G1, a voltage regulator filter circuit 310, and a third current limiting resistor R7.

[0139] The first AC input terminal of the second rectifier circuit BD4 is used to connect to the first terminal (BS1) of the target circuit, and the second AC input terminal of the second rectifier circuit is used to connect to the second terminal (BS2) of the target circuit.

[0140] The positive terminal of the DC signal output of the second rectifier circuit BD4 is connected to the first terminal of the switching transistor G1. The positive terminal of the DC signal output of the second rectifier circuit is also connected to the first terminal of the pull-up resistor R8 through the voltage regulator filter circuit 310.

[0141] The second end of the pull-up resistor R8 is connected to the control terminal of the switching transistor G1. The control terminal of the switching transistor G1 is connected to the first end of the third current-limiting resistor R7 and the first end of the first filter capacitor C5. The second end of the switching transistor G1 is connected to the negative terminal of the DC signal output of the second rectifier circuit BD4 and the second end of the first filter capacitor C5.

[0142] The second end of the third current-limiting resistor R7 is connected to the signal output terminal of the second optocoupler in each of the N live indicator circuits 100.

[0143] When switch G1 is off, current cannot flow between the first and second AC input terminals of the second rectifier circuit BD4, thus disconnecting the target circuit (if the target circuit is the electromagnetic lock power supply circuit supplying the electromagnetic lock, the electromagnetic lock cannot operate at this time). When switch G1 is on, current can flow between the first and second AC input terminals of the second rectifier circuit, turning on the target circuit (if the target circuit is the electromagnetic lock power supply circuit supplying the electromagnetic lock, the electromagnetic lock can operate at this time). The first filter capacitor C5 can both filter the control signal input to switch G1 and act as an energy storage capacitor, maintaining switch G1 in a stable state (on or off) between two adjacent segments of the control signal indicating switch on (the specific holding time is determined by the charging and discharging time of the first filter capacitor).

[0144] Specifically, when the time interval between two adjacent signals indicating that the switch G1 is on is relatively long, the energy storage capacitor is used to keep the switch G1 in the off state. When the time interval between two adjacent signals indicating that the switch G1 is on is relatively short, the energy storage capacitor is used to keep the switch G1 in the on state.

[0145] Optionally, the specific values ​​of the first filter capacitor C5, pull-up resistor R8, and third current-limiting resistor R7 can be selected according to actual needs, and their specific values ​​are not restricted here.

[0146] Optionally, the switching transistor G1 can be a transistor, MOSFET, or other electronic component that can be used as a switch.

[0147] In one implementation, the specific structure of the second rectifier circuit is as follows: Figure 6 As shown. The second rectifier circuit includes the fifth rectifier diode ZD5, the sixth rectifier diode ZD6, the seventh rectifier diode ZD7, and the eighth rectifier diode ZD8.

[0148] The anode of the fifth rectifier diode ZD5 is connected to the first terminal BS1 of the target circuit. The cathode of the fifth rectifier diode ZD5 is connected to the cathode of the sixth rectifier diode ZD6. The cathode of the fifth rectifier diode ZD5 is also connected to the first terminal of the pull-up resistor R8 and the first terminal of the switching transistor G1.

[0149] The anode of the sixth rectifier diode ZD6 is connected to the second terminal BS2 of the target circuit and the cathode of the seventh rectifier diode ZD7.

[0150] The anode of the seventh rectifier diode ZD7 is connected to the second terminal of the switching transistor G1 and the anode of the eighth rectifier diode ZD8.

[0151] The cathode of the eighth rectifier diode ZD8 is connected to the anode of the fifth rectifier diode ZD5.

[0152] in, Figure 6 In the second rectifier circuit shown, the anode of the fifth rectifier diode ZD5 is the first AC input terminal, the cathode of the fifth rectifier diode ZD5 is the positive terminal of the DC signal output, the anode of the sixth rectifier diode ZD6 is the second AC input terminal, and the anode of the seventh rectifier diode ZD7 is the negative terminal of the DC signal output.

[0153] Optionally, in practical applications, the second rectifier circuit can be a packaged circuit corresponding to a bridge rectifier circuit.

[0154] In one embodiment, the voltage regulator filter circuit 310 may include a second current-limiting resistor, a Zener diode, and a second filter capacitor.

[0155] like Figure 7 As shown, the first end of the second current-limiting resistor R9 is connected to the positive terminal of the DC signal output of the second rectifier circuit, and the second end of the second current-limiting resistor R9 is connected to the first end of the second filter capacitor C4, the cathode of the Zener diode Z1, and the first end of the pull-up resistor R8.

[0156] The second terminal of the second filter capacitor C4 and the anode of the Zener diode Z1 are both connected to the negative terminal of the DC signal output of the second rectifier circuit.

[0157] Optionally, the voltage regulator and filter circuit 310 may also include a filter rectifier diode. The second terminal of the second current-limiting resistor is connected to the first terminal of the pull-up resistor through the filter rectifier diode.

[0158] For example, such as Figure 8 As shown, the first terminal of the second current-limiting resistor R9 is connected to the negative terminal of the DC signal output of the second rectifier circuit, and the second terminal of the second current-limiting resistor R9 is connected to the anode of the filter rectifier diode D1 and the cathode of the Zener diode Z1, respectively. The second terminal of the second filter capacitor C4 and the anode of the Zener diode Z1 are both connected to the negative terminal of the DC signal output of the second rectifier circuit.

[0159] The cathode of the filter rectifier diode D1 is connected to the first terminal of the second filter capacitor C4 and the first terminal of the pull-up resistor R8, respectively.

[0160] Alternatively, the first end of the second current-limiting resistor R9 can be connected to the positive terminal of the DC signal output of the second rectifier circuit, and the second end of the second current-limiting resistor R9 can be connected to the first end of the second filter capacitor C4, the cathode of the Zener diode Z1, and the first end of the pull-up resistor R8.

[0161] Alternatively, the first end of the second current-limiting resistor R9 can be connected to the negative terminal of the DC signal output of the second rectifier circuit, the second end of the second current-limiting resistor R9 can be connected to the anode of the filter rectifier diode D1, and the cathode of the filter rectifier diode D1 can be connected to the cathode of the Zener diode Z1, the first end of the second filter capacitor C4, and the first end of the pull-up resistor R8.

[0162] The second current-limiting resistor R9 reduces the current and improves safety. The second filter capacitor C4 and the filter rectifier diode filter the current output from the second rectifier circuit BD4, improving current stability. Therefore, a stable low-voltage DC circuit can be obtained using the second current-limiting resistor R9, the Zener diode Z1, the second filter capacitor C4, and the filter rectifier diode D1.

[0163] The specific types and models of the second current-limiting resistor R9, Zener diode Z1, second filter capacitor C4, and filter rectifier diode D1 can be selected according to actual needs, and there are no restrictions on their specific types and models here.

[0164] In one embodiment, the passive high-voltage live display interlocking device further includes a computer key interface circuit. The computer key interface circuit receives monitoring results from the controller 200 indicating whether the high-voltage equipment is energized, and sends the monitoring results to the computer key.

[0165] By setting up a computer key interface circuit, the controller 200 can send the monitoring results to the computer key through the computer key interface circuit.

[0166] Optionally, the computer key interface circuit may include: a power supply circuit and a communication circuit.

[0167] The power supply circuit is connected to the power supply terminal of the controller 200, and the power supply circuit is used to provide operating power to the controller 200.

[0168] The power supply circuit can be any existing type of circuit that can power the controller 200; there are no restrictions on its specific type here.

[0169] The input terminal of the communication circuit is connected to the signal output terminal of the controller 200; the communication circuit is used to receive and send the monitoring results output by the controller 200.

[0170] The communication circuit can be a wireless communication circuit, such as a wireless communication circuit based on Bluetooth, WiFi and other technologies, which transmits the monitoring results wirelessly.

[0171] Alternatively, the communication circuit can transmit monitoring results via a computer key interface.

[0172] In this configuration, the input terminal of the communication circuit is connected to the signal output terminal of the controller 200, and the output terminal of the communication circuit is used to connect to the computer key interface. The communication circuit is used to receive and send the monitoring results output by the controller 200. The computer key interface includes a unique identification coding device.

[0173] The communication circuit can be any existing type of circuit that enables data transmission via a computer key interface; there are no restrictions on its specific type.

[0174] To facilitate understanding of the aforementioned passive high-voltage live display interlocking device, the following will combine... Figure 9 Please provide an explanation.

[0175] like Figure 9 As shown, the passive high-voltage live display interlocking device includes three live indicator circuits 100, a controller 200, and an interlocking output circuit 300.

[0176] Each energized indicator circuit 100 includes a first rectifier circuit 110 (i.e., Figure 9 The components shown are BD1, BD2, and BD3, signal driving circuit 120, signal component 130, and first current limiting resistor. Signal component 130 includes a light-emitting diode, a first optocoupler, and a second optocoupler connected in series.

[0177] Taking the live indicator circuit 100 corresponding to the A-phase sensor signal as an example, the signal driving circuit 120 includes an energy storage capacitor, a leakage circuit 121, and a bidirectional trigger diode.

[0178] The leakage circuit 121 includes four leakage branches, three of which include switches (K1~K3) and leakage resistors (second leakage resistor R12, third leakage resistor R13, and fourth leakage resistor R14), and the other leakage branch includes a leakage resistor (first leakage resistor R11).

[0179] The first terminal of the energy storage capacitor C1, the first terminal of the bidirectional trigger diode SD1, the first terminal of the first bleeder resistor R11, the first terminal of the first switch K1, the first terminal of the second switch K2, and the first terminal of the third switch K3 are all connected to the positive terminal of the DC signal output of the first rectifier circuit 110. The second terminal of the first switch K1 is connected to the first terminal of the second bleeder resistor R12, the second terminal of the second switch K2 is connected to the first terminal of the third bleeder resistor R13, and the second terminal of the third switch K3 is connected to the first terminal of the fourth bleeder resistor R14.

[0180] The second terminal of the energy storage capacitor C1, the second terminal of the first bleeder resistor R11, the second terminal of the second bleeder resistor R12, the second terminal of the third bleeder resistor R13, and the second terminal of the fourth bleeder resistor R14 are all connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0181] The second terminal of the bidirectional trigger diode SD1 is connected to the anode of the light-emitting diode LED1 through the first current-limiting resistor R4. The cathode of the light-emitting diode LED1 is connected to the anode of the first optocoupler U4, and the signal output terminal of the first optocoupler U4 is connected to the PSA terminal of the controller 200. The cathode of the first optocoupler U4 is connected to the anode of the second optocoupler U1, and the cathode of the second optocoupler U1 is connected to the negative terminal of the DC signal output of the first rectifier circuit 110.

[0182] The AC signal output terminal of the first rectifier circuit 110 is grounded through the protection resistor R1 (referring to the grounding of the AC signal). The second output terminal of the first optocoupler U4 is grounded (referring to the grounding of the digital signal, i.e., the reference zero potential), and the second output terminal of the second optocoupler U1 is connected to the negative terminal of the DC signal output of the second rectifier circuit. Figure 9 The locations marked as VSS indicate that they are interconnected.

[0183] The interlocking output circuit 300 includes a second rectifier circuit, a first filter capacitor C5, a pull-up resistor R8, a switching transistor G1, a third current-limiting resistor R7, and a voltage regulator filter circuit 310. The voltage regulator filter circuit 310 includes a second current-limiting resistor R9, a Zener diode Z1, a second filter capacitor C4, and a filter rectifier diode D1.

[0184] The first AC input terminal of the second rectifier circuit is used to connect to the first terminal BS1 of the target circuit, and the second AC input terminal of the second rectifier circuit is used to connect to the second terminal BS2 of the target circuit.

[0185] The positive terminal of the DC signal output of the second rectifier circuit is connected to the drain of the switching transistor G1 and the first terminal of the second current-limiting resistor R9.

[0186] The second terminal of the second current-limiting resistor R9 is connected to the cathode of the Zener diode Z1 and the anode of the filter rectifier diode D1, respectively. The second terminal of the second filter capacitor C4 and the anode of the Zener diode Z1 are both connected to the negative terminal of the DC signal output of the second rectifier circuit.

[0187] The cathode of the filter rectifier diode D1 is connected to the first terminal of the second filter capacitor C4 and the first terminal of the pull-up resistor R8, respectively.

[0188] The second end of the pull-up resistor R8 is connected to the gate of the switching transistor G1. The gate of the switching transistor G1 is also connected to the signal output terminals of the second optocouplers U1, U2, and U3, respectively. The gate of the switching transistor G1 is also connected to the negative terminal of the DC signal output of the second rectifier circuit through the first filter capacitor C5.

[0189] The source of switching transistor G1 is connected to the negative terminal of the DC signal output of the second rectifier circuit. The source of switching transistor G1 is also connected to the negative terminal of the DC signal output of the second rectifier circuit.

[0190] like Figure 9 The circuit shown is illustrated using the aforementioned high-current setting as an example. In actual operation, as the voltage rises from zero to the nominal voltage (energized), the current value of the sensor signal increases. After rectification by rectifier circuits BD1, BD2, and BD3, it is converted into direct current.

[0191] Taking the high-voltage live indicator circuit 100 corresponding to the A-phase signal as an example, when the current is less than the current discharged by the high current range of 78uA, most of the current in the sensor signal is discharged by the first discharge resistor R11 and the fourth discharge resistor R14. The energy storage capacitor C1 cannot be charged to a level that makes the bidirectional trigger diode SD1 conduct above the voltage, and the light-emitting diode LED1 remains off. At this time, the indication is that the high voltage is not live.

[0192] As the high voltage continues to rise, the AC current (i.e., the sensor signal) drawn from the sensor continues to rise. When the current exceeds the 78uA current discharged from the high current level, the energy storage capacitor C1 continues to charge, and the voltage across the energy storage capacitor C1 increases. When it exceeds the breakdown voltage of the bidirectional trigger diode SD1, SD1 is in the conducting state. The electrical energy on the energy storage capacitor C1 supplies power to the light-emitting diode LED1 and the second optocoupler U1 and the first optocoupler U4 through the first current-limiting resistor R4, causing the light-emitting diode LED1 to light up, and at the same time, the output terminal of the optocoupler is turned on.

[0193] When the energy stored in the energy storage capacitor C1 is continuously consumed, and the voltage across the bidirectional trigger diode SD1 drops below the disconnection voltage, the bidirectional trigger diode SD1 disconnects, the light-emitting diode goes out, the output terminal of the optocoupler also disconnects, and the energy storage capacitor enters the next charging and discharging cycle. This process repeats continuously, thereby synchronizing the flash frequency of the light signal emitted by the light-emitting diode with the frequency of the first pulse signal at the output terminal of the first optocoupler.

[0194] Since the LED flash signal is triggered by the capacitor charging and storing energy, the current is much higher than the original sensor signal, reaching the mA level or above, ensuring that the first and second optocouplers can operate reliably.

[0195] When there is no high voltage, the sensor has no signal, the live indicator circuit 100 does not work, the live indicator light goes out, and the output terminals of the first and second optocouplers are disconnected.

[0196] Compared with existing solutions, in each energized indicator circuit 100, current flows through both the first and second optocouplers simultaneously, enabling the software to acquire a first pulse signal that is completely synchronized with the flash frequency of the light-emitting diode.

[0197] When the key performs an electrical test, power is supplied to the controller 200 via the computer key interface circuit, and the controller 200 begins operation. The controller 200 accurately obtains the flashing frequency of the corresponding light signal emitted by the LED by measuring the pulse interval period in each first pulse signal. This frequency is compared with a preset charging frequency threshold. When the flashing frequency is less than the charging frequency threshold, it is determined that there is no high voltage. When the flashing frequency is greater than or equal to the charging frequency threshold, it is determined that there is high voltage.

[0198] Furthermore, to eliminate potential instability near the electrified frequency threshold, a certain hysteresis margin, such as 5%, can be added to the electrified frequency threshold. That is, when the flicker frequency is greater than or equal to 5% of the electrified frequency threshold (i.e., flicker frequency ≥ electrified frequency threshold × 105%), it is judged as high voltage electrified. When the flicker frequency is less than 5% of the electrified frequency threshold (i.e., flicker frequency < electrified frequency threshold × 95%), it is judged as high voltage de-energized.

[0199] The energizing frequency threshold can be referenced from the DLT538 standard, which requires a repetition frequency of at least 1Hz. The final overall logic for determining whether the high-voltage equipment is energized is as follows: if any single phase is energized, the entire high-voltage system is considered energized; only when all N phases are de-energized is the entire high-voltage system considered de-energized.

[0200] Furthermore, the signal output terminals of the three second optocouplers U1, U2, and U3 are all connected together, and the signal is filtered and limited by the third current-limiting resistor R7 and the first filter capacitor C5, and then used as the on / off control signal of the switching transistor G1 in the interlocking output circuit 300.

[0201] Meanwhile, in practical applications, the output terminals BS1 and BS2 of the interlocking output circuit 300 need to be connected to the target circuit (taking the target circuit as the electromagnetic lock power supply circuit as an example). The second rectifier circuit BD4 enables this scheme to be compatible with AC and DC power supplies. The external power supply (the power provided by the target circuit) is converted into DC. After current limiting by the second current limiting resistor R9, voltage regulation by the Zener diode Z1, and filtering by the second filter capacitor C4 and the filter rectifier diode D1, a stable low DC voltage can be obtained. This voltage is then used as a pull-up resistor R8 as a pull-up for the control signal. When any of the second optocoupler output terminals is turned on (i.e., when the high voltage is on), the control signal is low, the switching transistor G1 is turned off, and the interlocking output terminals BS1 and BS2 are in the off state. The electromagnetic lock cannot obtain working power and is in the locked state.

[0202] When all output terminals of the second optocoupler are disconnected (i.e., when there is no high voltage), the control signal is at a high level under the pull-up resistor R8, the switching transistor G1 is turned on, and the interlock output terminals BS1 and BS2 are in the on state, so the electromagnetic lock can obtain working power and is in the operable unlocking state.

[0203] Since the output of the second optocoupler is in an intermittent on-off state when the high voltage is on, the charging and discharging time of the first filter capacitor C5 can be controlled by selecting appropriate parameters for the pull-up resistor R8 and the first filter capacitor C5, and selecting an appropriate Z1 regulated voltage. This ensures that even if only one of the second optocoupler switching frequencies is at the minimum allowable switching frequency value, the control signal can remain at a stable low level, thus achieving reliable interlocking output blocking.

[0204] In this solution, the passive high-voltage live display interlocking device 10 can indicate the live status of high-voltage equipment without the need for an external power supply. Each live indicator circuit 100 has two optocouplers connected in series, which are electrically connected to the interlocking output circuit 300 and the controller 200, respectively. They are used to drive the interlocking output and to collect the flashing pulses of the live indicator light. It can directly lock electromagnetic locks and other electrical control equipment on-site through the interlocking output, and can also exchange data with the computer key and cooperate with the anti-misoperation lock to perform voltage detection and anti-misoperation interlocking operations, thereby preventing accidental entry into the live compartment and preventing live misoperation.

[0205] The examples provided are for illustrative purposes only and should not be construed as limiting the scope of this application.

[0206] In one implementation, the signal output terminals of the three first optocouplers are combined and output to the controller 200. For example... Figure 10 As shown, after the signal output terminals of the first optocouplers U4, U5, and U6 are connected, they are connected to the PS terminal of the controller 200.

[0207] This method cannot individually acquire the first pulse signal from each energized indicator circuit 100, but it only requires occupying one I / O port of the controller 200. Furthermore, only one first pulse signal needs to be measured to obtain the final monitoring result of whether the high-voltage equipment is energized.

[0208] in, Figure 10 Other structures of the circuit shown are similar to Figure 9 The method shown is the same, and for the sake of brevity, it will not be elaborated further here.

[0209] In one embodiment, the passive high-voltage live display interlocking device further includes N voltage sensors. Each voltage sensor is connected to a first rectifier circuit 110, and each voltage sensor is used to monitor the voltage of one phase of electricity within the high-voltage equipment.

[0210] Optionally, in the case where the passive high-voltage live display interlocking device includes N sensor signal interfaces, each voltage sensor is connected to a first rectifier circuit 110 through a sensor signal interface.

[0211] The specific type of voltage sensor can be selected according to actual needs. Each voltage sensor is used to monitor one of the phases of the N-phase electricity to obtain a sensor signal.

[0212] In one implementation, such as Figure 11 As shown, the passive high-voltage live display interlocking device 10 also includes: N sensor signal interfaces 900 and phase interface 800.

[0213] One of the voltage sensors 700 is connected to a first rectifier circuit 110 through a sensor signal interface 900.

[0214] The phase identification interface 800 is connected to each sensor signal interface 900. The phase identification interface 800 is used to receive the sensor signals sent by each sensor signal interface 900 and send the sensor signals to the phase identification device.

[0215] In one embodiment, the passive high-voltage live display interlocking device 10 further includes an interlocking output port 600. The interlocking output port 600 is connected to the output terminal of the interlocking output circuit 300 and is used to connect to the target circuit.

[0216] In one embodiment, the passive high-voltage live display interlocking device 10 further includes a computer key interface 500. The computer key interface 500 is connected to the communication circuit 410 and the power supply circuit 420 included in the computer key interface circuit 400.

[0217] In one embodiment, the passive high-voltage live display interlocking device 10 further includes a housing. N live indicator circuits 100, a controller 200, and an interlocking output circuit 300 are disposed within the housing, and N optical signals for indicating whether the device is live can be emitted outside the housing; a phase interface 800, a computer key interface 500, and an interlocking output port 600 are exposed on the surface of the housing.

[0218] The passive high-voltage live display interlocking device 10 provided in this application can be used to visually indicate whether high-voltage equipment is energized. For example, it can be applied to intelligent power distribution switch control equipment such as switchgear and ring main units in smart power distribution networks. It can indicate whether high-voltage equipment is energized through light-emitting diodes, and it can also determine whether high-voltage equipment is energized through the controller 200.

[0219] Based on the same technical concept, this application also provides a power distribution network voltage detection interlocking anti-misoperation system, such as... Figure 12 As shown, the interlocking system includes a passive high-voltage live display interlocking device 10, an unlocking device 20, a server 30, and at least one first lock 40.

[0220] Server 30 is used to send tasks to the unlocking device.

[0221] This task can be used to instruct the unlocking of a designated first lock.

[0222] Optionally, the server 30 can be one or more devices such as a server, mobile management terminal, IoT platform, workstation, etc.

[0223] The unlocking device 20 is communicatively connected to the passive high-voltage live display interlocking device 10 to obtain the voltage detection result.

[0224] The unlocking device 20 is configured to have unlocking authority for the target first lock when the voltage test result indicates that it is not energized and a task to unlock the target first lock is received. When the unlocking device 20 has unlocking authority, it communicates with the target first lock to unlock the target first lock 40.

[0225] Optionally, the unlocking device 20 can be an unlocker 21, which has communication capabilities and can receive tasks sent by the server 30, as well as receive the voltage verification results sent by the passive high-voltage live display interlocking device 10.

[0226] Alternatively, the unlocking device 20 may also include a local anti-misoperation unit 22 and an unlocker 21, both of which have communication capabilities. The local anti-misoperation unit 22 can receive tasks sent by the server 30 and send the received tasks to the corresponding unlocker 21. The unlocker 21 receives the voltage verification result sent by the passive high-voltage live display interlocking device 10.

[0227] Optionally, if the unlocking device 20 includes a local anti-misoperation unit 22 and an unlocker 21, the unlocker 21 can also be directly connected to the server 30 and receive tasks directly from the server 30.

[0228] Optionally, the first lock 40 can be any lock that can be unlocked via communication, such as a smart electronic lock.

[0229] Optionally, the local anti-misoperation unit 22 can serve as a communication and control hub to receive tasks from the server 30, communicate with the unlocker 21, and manage the local unlocker 21.

[0230] The unlocker 21 can be the core tool for maintenance personnel to perform unlocking operations. The unlocking permission of the unlocker 21 can be determined by the unlocker 21 itself based on the received task and the power verification result, or it can be issued by the local anti-misoperation unit 22. If the local anti-misoperation unit 22 determines that unlocking is permissible based on the received task and the power verification result, it will issue unlocking permission to the corresponding unlocker.

[0231] In one embodiment, the passive high-voltage live-line display interlocking device includes an interlocking output circuit. In this case, the distribution network voltage detection interlocking anti-misoperation system also includes a second lock 50.

[0232] The second lock 50 is connected to the interlocking output circuit of the passive high-voltage live display interlocking device 10. The interlocking output circuit control is used to control the opening and closing of the circuit in the second lock 50;

[0233] When the circuit in the second lock 50 is disconnected, the second lock 50 is inoperable; when the circuit in the second lock 50 is connected, the second lock is operable.

[0234] The second lock 50 can be, for example, an electromagnetic lock.

[0235] The operable state can mean that the second lock 50 is in the unlocked state, or it can mean that the second lock 50 is in a state that can be unlocked.

[0236] An inoperable state can mean that the second lock 50 is in a locked state, or it can mean that the second lock 50 is in a state that cannot be unlocked.

[0237] The second lock 50 may include an electromagnetic lock power supply circuit 51 and an electromagnetic lock body 52. ​​For example... Figure 13 As shown, the passive high-voltage live display interlocking device 10, the electromagnetic lock power supply circuit 51, and the electromagnetic lock body 52 are shown.

[0238] The passive high-voltage live display interlocking device 10 is connected to the electromagnetic lock power supply circuit 51, which is used to supply power to the electromagnetic lock body 52.

[0239] The electromagnetic lock power supply circuit 51 provides power to the electromagnetic lock body 52. ​​When the electromagnetic lock power supply circuit 51 is disconnected, the electromagnetic lock body 52 is de-energized, thus rendering the electromagnetic lock body 52 inoperable. The specific methods and principles for controlling the electromagnetic lock body 52 have been clearly described above and will not be repeated here for the sake of brevity.

[0240] To facilitate understanding of the working logic of the power distribution network detection interlocking anti-misoperation system described above, examples will be provided below.

[0241] When the unlocking device 20 includes a local anti-misoperation unit 22 and an unlocker 21, the server 30 can send a task to the local anti-misoperation unit 22. The local anti-misoperation unit 22 then issues unlocking permission to the unlocker 21 corresponding to the task.

[0242] Meanwhile, after the unlocking device 21 receives the unlocking permission from the local anti-misoperation unit 22, it also needs to obtain the power verification result of the corresponding first lock 40. If the power verification result indicates that there is no power, it has the unlocking permission for the first lock 40.

[0243] Furthermore, the passive high-voltage live display interlocking device 10 controls the conduction of the circuit in the corresponding second lock 50, so that the second lock 50 is in an operable state, allowing maintenance personnel to open the second lock 50.

[0244] Alternatively, the on-site anti-misoperation unit 22 may receive the task and then issue the task to the corresponding unlocker 21. Upon receiving the task, the unlocker 21 obtains the corresponding voltage detection result. If the voltage detection result indicates no power, the unlocker 21 obtains unlocking permission for the first lock 40. If the voltage detection result indicates power, the unlocker 21 does not obtain unlocking permission for the first lock 40.

[0245] Alternatively, the server 30 can directly send the task to the unlocker 21. Upon receiving the task, the unlocker 21 obtains the corresponding voltage test result. If the voltage test result indicates no power, the unlocker 21 gains unlocking permission for the first lock 40. If the voltage test result indicates power, the unlocker 21 does not gain unlocking permission for the first lock 40.

[0246] The distribution network voltage detection interlocking anti-misoperation system provided in this application can directly drive the second lock through the interlocking output port 600 of the passive high-voltage live display interlocking device 10, and communicate with the server 30 and the passive high-voltage live display interlocking device 10 through the unlocking device 20 to unlock the first lock 40. It implements the use of the high-voltage equipment's live state as a criterion for preventing misoperation, and binds two unlocking logics, both of which are indispensable, thus improving safety. Furthermore, this solution can be applied to unlocking distribution network equipment, solving misoperation problems such as "closing the grounding switch while energized," "energizing with grounding on," and "accidentally entering a live hazardous area" in the operation of distribution network equipment.

[0247] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A passive high-voltage live display interlocking device, characterized in that, include: There are N live indicator circuits and controllers, wherein the value of N is the same as the number of phases of the power supply in the high-voltage equipment; each live indicator circuit corresponds to one phase of power; each live indicator circuit is used to receive a sensor signal, which is a signal obtained by monitoring the corresponding phase of power. Each of the aforementioned live indicator circuits includes a first rectifier circuit, a signal driving circuit, and a signal component; wherein the signal component includes a light-emitting diode and a first optocoupler connected in series. The first rectifier circuit is used to receive the corresponding sensor signal and convert the sensor signal into a DC signal output; The signal driving circuit is used to control whether to supply power to the signal component based on the DC signal; the signal driving circuit includes an energy storage capacitor, a bleeder circuit, and a bidirectional trigger diode; the first terminal of the energy storage capacitor, the first terminal of the bleeder circuit, and the first terminal of the bidirectional trigger diode are all connected to the positive terminal of the DC signal output of the first rectifier circuit; the second terminal of the energy storage capacitor and the second terminal of the bleeder circuit are both connected to the negative terminal of the DC signal output of the first rectifier circuit; the second terminal of the bidirectional trigger diode is connected to the negative terminal of the DC signal output of the first rectifier circuit through the signal component; When the signal driving circuit supplies power to the signal component, the light-emitting diode is turned on and emits a light signal to indicate whether the corresponding phase of the high-voltage equipment is energized; at the same time, the first optocoupler outputs a first pulse signal; the controller is used to determine whether the high-voltage equipment is energized based on N first pulse signals; the frequency of the light signal is consistent with the frequency of the first pulse signal to ensure that the light emission indication of the light-emitting diode is consistent with the judgment result of the controller.

2. The passive high-voltage live display interlocking device according to claim 1, characterized in that, The leakage circuit includes M leakage branches; The first end of each of the aforementioned bleed branch is connected to the positive terminal of the DC signal output of the first rectifier circuit, and the second end of each of the aforementioned bleed branch is connected to the negative terminal of the DC signal output of the first rectifier circuit. The resistance values ​​of different leakage branches are different, and at least M-1 leakage branches include switches, which are used to control the conduction and disconnection of the leakage branch.

3. The passive high-voltage live display interlocking device according to claim 2, characterized in that, The bleed circuit includes four bleed branches to cover the sensor signal current range of 7uA to 300uA, and meets the requirement that the live indication threshold is 26% to 69% of the phase voltage of the phase. The number of the discharge branches satisfies (69 / 26). x With a current rating of ≥300 / 7, it achieves a sensor signal current range covering 7uA to 300uA, and meets the requirement that the live indication threshold is 26% to 69% of the phase voltage of the phase. 69 / 26 is the dynamic multiple corresponding to 26%~69% of the phase voltage of the phase current, 300 / 7 is the ratio of the upper limit to the lower limit of the sensor signal current range, x is the number of leakage branches included in the leakage circuit, and 4 is x satisfying (69 / 26). x The minimum value of ≥300 / 7.

4. The passive high-voltage live display interlocking device according to claim 3, characterized in that, The four bleeder branches are respectively one of the following speed ranges: low current range, medium-low current range, medium-high current range, and high current range; The current ranges corresponding to the small current range, the medium-small current range, the medium-large current range, and the large current range are respectively: 7uA~18uA, 18uA~46uA, 46uA~118uA, and 118uA~300uA; The discharge current corresponding to each current level is 26% of the upper limit current of that current level, namely 4.7uA, 12uA, 30.7uA and 78uA respectively.

5. The passive high-voltage live display interlocking device according to claim 4, characterized in that, With the breakdown voltage of the bidirectional trigger diode at 30V, the resistance values ​​of the four bleeder branches are as follows: 6.4MΩ for the bleeder branch corresponding to the small current range, 2.5MΩ for the bleeder branch corresponding to the medium-small current range, 0.98MΩ for the bleeder branch corresponding to the medium-large current range, and 0.39MΩ for the bleeder branch corresponding to the large current range.

6. The passive high-voltage live display interlocking device according to claim 1, characterized in that, The controller includes N signal receiving ports, one of which is connected to the output of a first optocoupler in the energized indicator circuit. The controller is used to obtain the monitoring result of whether each phase of the monitored electricity is energized based on the frequency of N first pulse signals.

7. The passive high-voltage live display interlocking device according to claim 1, characterized in that, The signal component further includes a first current-limiting resistor; wherein the light-emitting diode, the first optocoupler, and the first current-limiting resistor are connected in series.

8. The passive high-voltage live display interlocking device according to claim 1, characterized in that, The passive high-voltage live display interlocking device further includes: an interlocking output circuit; The signal component further includes a second optocoupler; wherein the light-emitting diode, the first optocoupler, and the second optocoupler are connected in series; the signal output terminal of the second optocoupler is used to output a control signal; The interlocking output circuit is used to control the opening and closing of the target circuit in response to N control signals.

9. The passive high-voltage live display interlocking device according to claim 8, characterized in that, The interlocking output circuit includes: a second rectifier circuit, a first filter capacitor, a pull-up resistor, a switching transistor, a voltage regulator filter circuit, and a third current limiting resistor; The first AC input terminal of the second rectifier circuit is used to connect to the first terminal of the target circuit, and the second AC input terminal of the second rectifier circuit is used to connect to the second terminal of the target circuit; The positive terminal of the DC signal output of the second rectifier circuit is connected to the first terminal of the switching transistor; the positive terminal of the DC signal output of the second rectifier circuit is also connected to the first terminal of the pull-up resistor through the voltage regulation and filtering circuit. The second end of the pull-up resistor is connected to the control terminal of the switching transistor. The control terminal of the switching transistor is connected to the first end of the third current-limiting resistor and the first end of the first filter capacitor. The second end of the switching transistor is connected to the negative DC signal output terminal of the second rectifier circuit and the second end of the first filter capacitor. The second end of the third current-limiting resistor is connected to the signal output end of the second optocoupler in each of the N charged indicator circuits.

10. The passive high-voltage live display interlocking device according to claim 9, characterized in that, The voltage stabilizing and filtering circuit includes: a second current-limiting resistor, a Zener diode, and a second filter capacitor; The first end of the second current-limiting resistor is connected to the positive terminal of the DC signal output of the second rectifier circuit, and the second end of the second current-limiting resistor is connected to the first end of the second filter capacitor, the cathode of the Zener diode, and the first end of the pull-up resistor, respectively. The second terminal of the second filter capacitor and the anode of the Zener diode are both connected to the negative terminal of the DC signal output of the second rectifier circuit.

11. The passive high-voltage live display interlocking device according to claim 10, characterized in that, The voltage stabilizing filter circuit further includes: a filter rectifier diode; The second end of the second current-limiting resistor is connected to the first end of the pull-up resistor through the filter rectifier diode.

12. The passive high-voltage live display interlocking device according to claim 10, characterized in that, The passive high-voltage live display interlocking device further includes: N voltage sensors; Each of the voltage sensors is connected to one of the first rectifier circuits, and each of the voltage sensors is used to monitor the voltage of one phase of electricity within the high-voltage equipment.

13. A power distribution network voltage detection interlocking anti-misoperation system, characterized in that, include: The unlocking device, the server, at least one first lock, and the passive high-voltage live display locking device as described in any one of claims 1-12; The server is used to send tasks to the unlocking device; The unlocking device is communicatively connected to the passive high-voltage live display interlocking device to obtain the voltage detection result; The unlocking device is configured to have the authority to unlock the target first lock when the voltage test result indicates that it is not energized and a task to unlock the target first lock is received. When the unlocking device has the unlocking authority, the unlocking device is communicatively connected to the target first lock to unlock the target first lock.

14. The distribution network voltage detection interlocking anti-misoperation system according to claim 13, characterized in that, The passive high-voltage live display interlocking device is the passive high-voltage live display interlocking device according to any one of claims 8-12, and the power distribution network voltage detection interlocking anti-misoperation system further includes a second lock; The second lock is connected to the interlocking output circuit of the passive high-voltage live display interlocking device; the interlocking output circuit is used to control the opening and closing of the circuit in the second lock; When the circuit in the second lock is disconnected, the second lock is inoperable; when the circuit in the second lock is connected, the second lock is operable.

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