A method, system, device, and medium for high-voltage live display interlocking with contact input.

Abstract

This invention discloses a high-voltage live display interlocking method, system, device, and medium with contact input, relating to the field of safety monitoring and control technology for high-voltage equipment in power systems. It includes acquiring the live information of the high-voltage equipment under test through non-contact sensing and outputting a sensing signal; extracting signal features from the sensing signal to obtain criterion information characterizing whether the high-voltage equipment is live and generating a live status signal; receiving the live status signal, contact input signals from external devices, and the status signal of the anti-misoperation key; performing comprehensive logical judgment to generate control commands; executing status operations according to the control commands; and displaying and recording the live status, the control command execution result, and the device's own status; and driving the transition between safe states based on the results. This invention achieves a comprehensive improvement in high-voltage equipment anti-misoperation protection, moving from single-judgment to systematic, intelligent, and reliable protection.

Description

Technical Field

[0001] This invention relates to the field of safety monitoring and control technology for high-voltage equipment in power systems, specifically to a high-voltage live display interlocking method, system, equipment, and medium with contact input. Background Technology

[0002] High-voltage live display interlocking devices are the core line of defense for ensuring the safety of personnel and equipment in power systems. They are mainly used to monitor the live status of high-voltage equipment in real time and forcibly control the opening and closing of grounding switches or cabinet doors according to preset logic to prevent serious accidents such as accidental entry into live compartments. With the advancement of smart grid construction, traditional electromagnetic induction display technology is gradually evolving towards electronic and digital directions based on capacitive sensing and microprocessor processing. Non-contact signal acquisition using the principle of electric field coupling has become the mainstream.

[0003] However, existing high-voltage live-line interlocking technologies still have significant shortcomings in the safety logic control of the system. These shortcomings are mainly reflected in the singularity of interlocking criteria and the limitations of system interaction. Most existing technologies rely solely on the sensing signal of a single high-voltage sensor as the only condition for interlocking, lacking comprehensive logical analysis of the actual position contacts of primary equipment such as circuit breakers and disconnect switches, as well as the operation status of anti-misoperation keys. This makes them prone to false operation or failure to operate due to occasional sensor failures or signal distortions, and they are difficult to meet the stringent requirements of the "five-proof" system for complex interlocking logic. In addition, in terms of the reliability of state confirmation, existing technologies often lack a timing stability verification mechanism based on multi-source information fusion, which cannot effectively filter out instantaneous state disturbances, thus posing a safety hazard to the interlocking logic in critical states. Summary of the Invention

[0004] In view of the above-mentioned existing problems, the present invention provides a high-voltage live display interlocking method, system, device and medium with contact input, to solve the problem that the prior art lacks a timing stability verification mechanism based on multi-source information fusion and cannot effectively filter out instantaneous state disturbances.

[0005] To address the aforementioned technical problems, a high-voltage live-line display and interlocking method with contact input is proposed, comprising: The system acquires the energization information of the high-voltage equipment under test through non-contact sensing and outputs an induction signal. The induction signal undergoes signal feature extraction processing to obtain criterion information indicating whether the high-voltage equipment is energized. Based on this criterion information, the system determines the energization status of each phase of the high-voltage line and generates an energization status signal. It receives the energization status signal, contact input signals from external equipment, and the status signal from the anti-misoperation key, performs comprehensive logical judgment, and generates control commands. Based on the control commands, the system executes status operations and displays and records the energization status, the control command execution results, and the device's own status. Based on the results, it drives the transition between safe states.

[0006] As a preferred embodiment of the high-voltage live display interlocking method with contact input described in this invention, the output sensing signal includes three independent capacitive sensors installed on the three-phase high-voltage line respectively, sensing based on the principle of electric field coupling. The relationship between the induced voltage output by the sensor and the high-voltage line voltage is determined by the equivalent coupling capacitance between the sensor and the line and the equivalent input capacitance of the detection circuit. The actual voltage of the high-voltage line is calculated by measuring the induced voltage.

[0007] As a preferred embodiment of the high-voltage live display interlocking method with contact input described in this invention, the signal feature extraction process includes: synchronously acquiring the induced signal, converting it into a digital signal sequence, performing frequency domain interference suppression processing on the digital signal sequence, and analyzing and judging the core feature quantity of the live state from the signal after interference suppression processing.

[0008] As a preferred embodiment of the high-voltage live display interlocking method with contact input described in this invention, the comprehensive logic judgment includes: acquiring and monitoring the live status signal, the status of multiple external contact input signals, and the insertion and removal and identity information of the anti-misoperation key in real time; matching and verifying the monitored signal status combination with the pre-stored safety interlocking rules; and making a decision and generating the final control command based on the matching and verification results and the preset timing stability conditions.

[0009] As a preferred embodiment of the high-voltage live display interlocking method with contact input described in this invention, the frequency domain interference suppression processing includes applying a fourth-order Butterworth low-pass digital filter to the digital signal sequence, setting the cutoff frequency to 200Hz, and multiplying the filtered data sequence by a Hanning window function for windowing processing. The discrete difference equation of the filter is expressed as: in, Let n be the output value of the filter at the current sampling time. Let be the input value of the filter at the k-th sampling time in the past. Let be the output value of the filter at the k-th sampling time in the past. These are the forward filter coefficients. For the feedback filter coefficients, This is the index of the filter order; The formula for windowing is expressed as follows: in, Let be the window value of the Hanning window function at the m-th sampling point. The index is the sequence number of the sampling point. The length of the data window for the FFT transform. Pi is a constant. For cosine trigonometric functions, The signal sequence after windowing. The output sequence of the filter; The core feature quantities for analyzing and determining the charged state include performing a fast Fourier transform on the windowed data sequence to obtain the spectrum, locating the spectral line corresponding to the 50Hz power frequency from the spectrum, calculating the amplitude of the current spectral line, and using the amplitude as the core feature quantity for determining the charged state.

[0010] As a preferred embodiment of the high-voltage live display interlocking method with contact input described in this invention, the safety interlocking rules include: requiring all three-phase live status signals to indicate no energization, and at least one designated circuit breaker or disconnector switch auxiliary contact input signal indicating open state; requiring all three-phase live status signals to indicate no energization, and the grounding switch auxiliary contact input signal indicating closed state, while the anti-misoperation key interface detects that the preset maintenance key has been correctly inserted; The preset timing stability conditions include that the duration for a signal state combination to match a security interlocking rule must reach a first preset delay threshold before an unlocking command is generated; and if the matching state fails within the first preset delay threshold, an interlocking command is generated immediately. The formula for calculating the timing stability condition is expressed as follows: in, The discharge threshold is... The charge-attracting threshold, The background noise amplitude, The determination coefficient is used to distinguish between charged and uncharged states. The coefficient is used to determine whether a substance is uncharged or charged.

[0011] As a preferred embodiment of the high-voltage live display interlocking method with contact input described in this invention, the step of driving the transition between safety states based on the result includes: power-on self-test state: after power-on, a self-test is performed; if the self-test passes and any phase is energized, the system transitions to the live interlocking state; if the self-test passes and all three phases are de-energized, the system transitions to the unlocking determination state; if the self-test fails, the system transitions to the fault interlocking state. Live-line interlocking state: When all three-phase live-line status signals indicate that the circuit is not live, and the external contact input signal meets the preset safety combination, and the duration of the anti-misoperation key process in the allowed step reaches the second preset delay threshold, the circuit can be transferred to the allowed unlocking judgment state. Allow unlocking determination state: In the current state, the unlocking condition is confirmed. When the condition is stably maintained for a period of time that reaches the third preset delay threshold, the state is switched to the unlock holding state and an unlocking command is output. If the condition fails during the period, the state is returned to the live lockout state. Unlocking and holding state: Outputs unlocking command and allows key operation. When any phase is detected to be energized again or the contact input becomes an unsafe combination, it immediately returns to the energized lockout state. Fault lockout state: Entered when the device self-test is abnormal or a critical fault occurs, outputting a lockout command and prohibiting key operation.

[0012] The beneficial effects of this preferred technical solution are as follows: it realizes live identification in a strong noise environment by combining non-contact induction with frequency domain feature extraction, constructs a multi-dimensional comprehensive safety interlocking logic by using multi-source signal fusion and timing stability verification, and realizes progressive unlocking confirmation and instantaneous response to dangerous states by means of a rigorous state machine transition mechanism, thus ensuring the system reliability and operation and maintenance safety under complex working conditions.

[0013] As a preferred embodiment of the high-voltage live display interlocking system with contact input described in this invention, it is characterized by comprising a high-voltage sensing module, a signal processing module, an interlocking logic and execution module, and a human-machine interaction and recording module.

[0014] The high-voltage sensing module uses three independent capacitive sensors that operate based on the principle of electric field coupling. When the sensors are installed on a high-voltage line, an equivalent coupling capacitor is formed between the line and the sensors, and the line voltage is induced by the capacitor to generate a voltage signal.

[0015] The signal processing module is used to protect, amplify, and convert analog induction signals to digital signals, suppress high-frequency noise through digital filtering, perform spectrum analysis using fast Fourier transform, separate and calculate the amplitude of the 50Hz power frequency component, and output the status signal of each phase.

[0016] The interlocking logic and execution module is used to receive energized status signals, auxiliary contact status signals, and anti-misoperation key status signals, and to make a comprehensive judgment based on preset interlocking rules and timing conditions. By driving relays, it controls the mechanical interlocking device of the high-voltage switchgear to perform forced interlocking and allow unlocking of electrical operations.

[0017] The human-machine interaction and recording module is used to display the energized status, interlocked status, device self-test results and fault information of each phase in real time through dual-color LED indicator lights and LCD screen, and automatically record key events in a structured format in chronological order.

[0018] A computer device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of a method for a high-voltage live display interlocking with contact input.

[0019] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a method for a high-voltage live display interlocking with contact input.

[0020] The beneficial effects of this invention are as follows: This invention utilizes three independent capacitive sensors based on the principle of electric field coupling to acquire induced signals. Through synchronous acquisition, digital filtering, windowing processing, and Fast Fourier Transform, the amplitude of the 50Hz power frequency line is extracted as the core feature quantity. This achieves non-contact, highly reliable monitoring of the energized state of high-voltage equipment and accurate identification in noisy environments, avoiding misjudgments caused by high-order harmonics and non-power frequency interference. Furthermore, by real-time fusion of the energized state signal, multiple external contact input signals, and anti-misoperation key state signal, and matching them with pre-stored safety interlocking rules, combined with… The continuous judgment cycle verification based on the time-series stability formula realizes the leap from single monitoring to multi-dimensional comprehensive safety interlocking, effectively filtering out instantaneous signal fluctuations. By constructing a complete state machine including power-on self-test, live interlocking, unlocking permission judgment, unlocking hold, and fault interlocking, and driving state transitions based on multiple delay thresholds and fast bounce mechanisms, it realizes progressive confirmation of the unlocking process and instantaneous response to dangerous states. Under complex electromagnetic environments and extreme working conditions, it ensures that the interlocking logic decision has high robustness, keeps the system on the safe side, and maximizes the personal safety of operation and maintenance personnel. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a general flowchart of a high-voltage live display interlocking method with contact input provided in one embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of a hybrid digital-analog processing structure for a high-voltage live display interlocking method with contact input, provided as an embodiment of the present invention.

[0024] Figure 3 The present invention provides a system scheme flowchart for a high-voltage live display interlocking system with contact input, according to one embodiment of the present invention. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0026] Example 1, referring to Figure 1 As an embodiment of the present invention, a high-voltage live display interlocking method with contact input is provided, comprising: S100: Acquires the energization information of the high-voltage equipment under test through non-contact induction and outputs an induction signal. The induction signal is processed by signal feature extraction to obtain criterion information characterizing whether the high-voltage equipment is energized.

[0027] S200: Based on the criterion information, determine the energized status of each phase of the high-voltage line and generate an energized status signal. Receive the energized status signal, contact input signals from external equipment, and status signals from the anti-misoperation key, perform comprehensive logical judgment, and generate control commands.

[0028] S300: Performs status operations according to control commands, and displays and records the energized state, the result of control command execution, and the state of the device itself, and drives the transition between safe states based on the results.

[0029] It should be noted that this invention integrates energized state, contact and key signals to construct multi-dimensional comprehensive logic and timing stability verification, realizes working condition linkage protection, and uses state machine management to solidify safety procedures into deterministic behaviors with fault-safe orientation, effectively improving detection accuracy and error prevention level.

[0030] Example 2, refer to Figure 1 and Figure 2 This is a second embodiment of the present invention, which provides a high-voltage live display interlocking method with contact input, comprising: In step S100, the output sensing signal includes steps S101 to S103: S101: Three independent capacitive sensors are installed near the three-phase high-voltage lines A, B, and C respectively, and sensing is performed based on the principle of electric field coupling.

[0031] S102: The relationship between the induced voltage output by the sensor and the high-voltage line voltage is determined by the equivalent coupling capacitance between the sensor and the line, and the equivalent input capacitance of the detection circuit, expressed by the formula: in, The induced voltage output by the sensor. This refers to the voltage of the high-voltage line. This is the equivalent coupling capacitance between the sensor and the high-voltage line. The equivalent input capacitance of the detection circuit.

[0032] S103: Since the two capacitor values ​​are constant after the sensor is installed in a fixed position, the induced voltage and the high-voltage line voltage show a stable linear proportional relationship. The actual voltage of the high-voltage line can be calculated by accurately measuring the induced voltage.

[0033] Furthermore, in step S100, the signal feature extraction process includes steps S111~S113: S111: The induced signal enters the protection circuit, where a reverse series Zener diode is used to limit the input voltage to prevent overvoltage damage to subsequent circuits. The signal is then amplified proportionally by an analog amplifier circuit, with the amplification factor set according to the sensor sensitivity and ADC input range.

[0034] S112: A 12-bit resolution multi-channel successive approximation analog-to-digital converter (ADC) is used to synchronously sample the three-phase induction signals, and three independent sampling channels are set up to correspond to the three phases A, B and C respectively. The ADC works in multi-channel scanning mode. The sampling frequency is set to 2kHz, and the sampling is triggered by the microcontroller's internal timer with a fixed period of 0.5ms. The three phases are switched sequentially within one sampling period, with a time difference of less than 50μs to ensure the accuracy of phase measurement. Each channel is set with a circular buffer of 1024 points, and the sampled data is stored in integer form.

[0035] S113: Perform a fourth-order Butterworth IIR low-pass filter on the sampled sequence to suppress noise; when the buffer data is full, multiply the filtered data by the Hanning window function to perform windowing to reduce spectral leakage, and perform a fast Fourier transform on the windowed sequence to obtain the complex spectrum, locate and extract the spectral line corresponding to the 50Hz power frequency component, and calculate the amplitude as the core characteristic quantity for phase characterization of the charged state. The discrete difference equation of the filter is expressed as: in, Let n be the output value of the filter at the current sampling time. Let be the input value of the filter at the k-th sampling time in the past. Let be the output value of the filter at the k-th sampling time in the past. These are the forward filter coefficients. For the feedback filter coefficients, This is the index of the filter order.

[0036] In an optional implementation, in step S100, the signal feature extraction process further includes generating an adaptive 50Hz sine / cosine reference signal internally after ADC sampling, and dynamically adjusting the filter coefficients according to the minimum mean square error principle to achieve the best match between the reference signal and the power frequency component in the sampled signal. The amplitude of the reference signal after matching is the extracted power frequency feature.

[0037] In another optional implementation, in step S100, the signal feature extraction process may further include: inputting the sampled signal into a digital phase-locked loop (PLL), locking and tracking the power frequency phase in the signal, generating a standard sine wave with the same phase, multiplying the original sampled signal with the sine wave and low-pass filtering it, and obtaining a DC component that is proportional to the power frequency amplitude.

[0038] Furthermore, in this embodiment of the application, step S113, the windowing process includes steps A1~A2: A1: The induced signal is subjected to anti-aliasing filtering and amplification, and is synchronously sampled by a multi-channel ADC at a fixed frequency (e.g., 2kHz) and converted into a digital sequence.

[0039] A2: Perform Butterworth low-pass digital filtering on the digital sequence to suppress high-frequency noise, and add a Hanning window to the filtered data and perform FFT operation to accurately calculate the amplitude of the 50Hz power frequency component from the spectrum as the core criterion; The formula for windowing is expressed as follows: in, Let be the window value of the Hanning window function at the m-th sampling point. The index is the sequence number of the sampling point. The length of the data window for the FFT transform. Pi is a constant. For cosine trigonometric functions, The signal sequence after windowing. This is the filter output sequence.

[0040] In an optional implementation, in step S113, the windowing process further includes decimating the sampled signal to reduce the data rate, designing a more targeted narrowband filter (such as a bandpass filter around 50Hz) for filtering at a lower sampling rate, and then interpolating to restore the original rate after processing.

[0041] In another alternative implementation, in step S113, the windowing process may further include using a high-quality power frequency notch filter to deeply attenuate strong background interference to 50 Hz, and using an adaptive filter to cancel residual power frequency-related specific harmonic interference (100 Hz).

[0042] In step S200, determining the energized state of each phase of the high-voltage line includes steps S201~S202: S201: Through a self-calibration mechanism, when it is confirmed that the high-voltage equipment is not energized, the three-phase induction signal is collected to calculate the background noise amplitude, and the energized pull-in threshold and energized release threshold with hysteresis characteristics are set. The formula for calculating the amplitude of background noise is expressed as: in, The discharge threshold is... The charge-attracting threshold, The background noise amplitude, The determination coefficient is used to distinguish between charged and uncharged states. The coefficient is used to determine whether a substance is uncharged or charged.

[0043] S202: Hysteresis comparison logic is used for state determination. If the current state is uncharged and the amplitude detected in multiple consecutive analysis cycles reaches or exceeds the pull-in threshold, the current phase state is set to charged. Conversely, if the current state is charged and the amplitude detected in multiple consecutive analysis cycles is lower than the release threshold, the current phase state is reset to uncharged. Record information containing the charged state of each phase is generated, avoiding state jitter caused by signal fluctuations within a single cycle and ensuring the accuracy of the determination.

[0044] Furthermore, in step S200, the comprehensive logic judgment includes steps S211~ S211: Receives auxiliary contact signals from the disconnecting switch, grounding switch, and cabinet door position of external devices, as well as the insertion and identity status of the anti-misoperation key. It performs software debouncing on the contact signals and makes comprehensive logic judgments based on the signals and the three-phase energized status. It constructs a state machine by defining five system states: power-on self-test, energized interlock, unlocking permission judgment, unlock holding, and fault interlock. S212: Perform interlocking logic judgment. After power-on, enter the corresponding initial state according to the self-test results and the energized status. In the energized interlocking state, when it is detected that all three phases are not energized, the contact input meets the preset safety combination, and the anti-misoperation key process is in the allowed step and continues to be stable for a preset time, then it will be transferred to the allowed unlocking judgment state.

[0045] S213: In the current state, further delay the confirmation of the unlocking conditions. After confirmation, output the unlocking command and enter the unlock holding state to allow key operation. If any condition fails or the maximum holding time is exceeded during this period, immediately return to the live lockout state. When a critical hardware failure is detected, the system unconditionally enters the fault lockout state, forcibly outputs the lockout command and prohibits operation, ensuring that the system is always on the fault-safe side.

[0046] Furthermore, in this embodiment of the application, in step S212, the locking logic judgment includes using a static rule table matching method based on "AND" logic. The pre-stored rules exist in the form of "condition A AND condition B AND condition C..." ("three-phase de-energized" AND "grounding switch closed" AND "maintenance key inserted"). During verification, the real-time collected Boolean state (0 / 1) is compared with each item in the rules. If all of them are in agreement, it is considered a match.

[0047] In an optional implementation, step S212, the locking logic judgment further includes constructing the security locking logic into a tree-like or flowchart-like structure. During verification, starting from the root node (initial state), branches are selected based on the real-time input signal values, and the process is traversed sequentially until the leaf node representing whether unlocking is allowed or locking is required is reached.

[0048] In another optional implementation, in step S212, the locking logic judgment may further include the system maintaining a current state security rule defined as "in state X, if condition set Y is satisfied, then action Z and transition to state K". During verification, the current state and input signal are combined to find the executable rule.

[0049] In step S300, the execution state operation includes steps S301 to S303: S301: According to the control command, the relay output mechanism performs the corresponding locking or unlocking operation, and the hardware design ensures that the relay is in the locked state when there is no working power to achieve power failure protection. S302: The system displays and records the energized status, control command execution results and device status in real time. The dual-color LED indicator lights equipped on each phase intuitively present the non-energized, energized, uncertain status and measurement fault status with different colors and flashing frequencies. The LCD screen displays the voltage detection information, lockout status and fault information of each phase in detail. S303: Utilizing SPI serial Flash memory, it adopts a structured format that includes timestamps, event types, phase flags, and event content parameters. It logs changes in energized state, latching and unlocking operations, anti-misoperation process events, and fault alarms in a circular queue. When the queue is full, it automatically overwrites the oldest data, achieving full-process traceability management.

[0050] It should be noted that in step S300, the safety status includes steps B1 to B5: B1: Power-on self-test status: After power-on, a self-test is performed. If the self-test passes and any phase is energized, it enters the energized interlock status. If the self-test passes and all three phases are de-energized, it enters the unlocking judgment status. If the self-test fails, it enters the fault interlock status.

[0051] B2: Live-line interlocking state: When all three-phase live-line status signals indicate that the circuit is not live, and the external contact input signal meets the preset safety combination, and the duration of the anti-misoperation key process in the allowed step reaches the second preset delay threshold, the circuit can be transferred to the allowed unlocking judgment state.

[0052] B3: Unlocking determination state: In the current state, the unlocking condition is confirmed. When the condition is held stably for a period of time that reaches the third preset delay threshold, the state is switched to the unlock holding state and an unlocking command is output. If the condition fails during the period, the state is returned to the live lockout state.

[0053] B4: Unlock Hold State: Outputs an unlock command and allows key operation. If any phase is detected to be energized again or the contact input becomes an unsafe combination, it immediately returns to the energized lockout state.

[0054] B5: Fault Lockout State: Entered when the device self-test is abnormal or a critical fault occurs, outputting a lockout command and prohibiting key operation.

[0055] Furthermore, in this embodiment of the application, in step S300, the transfer between security states driven by the result includes steps S311~S312: S311: Set the operation key and maintenance key. By maintaining the anti-misoperation process sequence and controlling the release and locking of the key in different states, ensure that the circuit breaker opening and grounding switch closing operations are performed in a predetermined order. When the key insertion or removal sequence is detected to be inconsistent with the pre-stored process, the operation is refused and an error is prompted to maintain the locked state.

[0056] S312: To adapt to changes in the long-term operating environment, an online threshold adaptive method is adopted. During specific periods when a phase is not energized and there is no operation, the noise amplitude distribution is statistically analyzed and the noise estimate is slowly corrected using an exponential moving average algorithm. The energized engagement and disengagement thresholds are recalculated, and a safety boundary is set to limit the adjustment range. This ensures the sensitivity and reliability of the device during long-term operation while preventing safety risks caused by adaptive adjustment.

[0057] In an optional implementation, in step S300, the transfer between safety states driven by the result further includes the transfer logic being described by ECA rules, whereby when an event (such as key removal) occurs and the condition (three phases not energized) is met, an action (releasing the lockout and updating the state variables) is executed.

[0058] In another optional implementation, in step S300, the transition between safe states driven by the result may further include, based on the deterministic state machine, adding a maximum holding time limit (10 minutes) for each state that may remain for a long time, automatically forcing a return to the safe lockout state after the timeout, and setting a watchdog for the critical state transition process, triggering fault protection when a state transition that is expected to be completed within a limited time fails to be completed.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0060] Example 3, referring to Figure 3 The third embodiment of the present invention provides a high-voltage live display interlocking system with contact input, including a high-voltage sensing module, a signal processing module, an interlocking logic and execution module, and a human-machine interaction and recording module.

[0061] The high-voltage sensing module uses three independent capacitive sensors that operate based on the principle of electric field coupling. When the sensors are installed on a high-voltage line, an equivalent coupling capacitor is formed between the line and the sensors, and the line voltage is induced by the capacitor to generate a voltage signal.

[0062] The signal processing module is used to protect, amplify, and convert analog induction signals to digital signals, suppress high-frequency noise through digital filtering, perform spectrum analysis using fast Fourier transform, separate and calculate the amplitude of the 50Hz power frequency component, and output the status signal of each phase.

[0063] The interlocking logic and execution module is used to receive energized status signals, auxiliary contact status signals, and anti-misoperation key status signals, and to make a comprehensive judgment based on preset interlocking rules and timing conditions. By driving relays, it controls the mechanical interlocking device of the high-voltage switchgear to perform forced interlocking and allow unlocking of electrical operations.

[0064] The human-machine interaction and recording module is used to display the energized status, interlocked status, device self-test results and fault information of each phase in real time through dual-color LED indicator lights and LCD screen, and automatically record key events in a structured format in chronological order.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0066] Example 4, the fourth embodiment of the present invention, differs from the previous three embodiments in that: If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0067] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0068] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0069] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

Claims

1. A high-voltage live-line display and interlocking method with contact input, characterized in that: include, The energization information of the high-voltage equipment under test is obtained by non-contact induction and an induction signal is output. The induction signal is processed by signal feature extraction to obtain the criterion information characterizing whether the high-voltage equipment is energized. Based on the criterion information, determine the energized status of each phase of the high-voltage line and generate an energized status signal. Receive the energized status signal, contact input signals from external equipment, and status signals from the anti-misoperation key, perform comprehensive logical judgment, and generate control commands. According to the control command, the device performs state operations and displays and records the energized state, the result of the control command execution, and the state of the device itself. Based on the result, it drives the transition between safe states.

2. The high-voltage live display interlocking method with contact input as described in claim 1, characterized in that: The output sensing signal includes three independent capacitive sensors installed on the three-phase high-voltage line respectively, which are based on the principle of electric field coupling. The relationship between the induced voltage output by the sensor and the voltage of the high-voltage line is determined by the equivalent coupling capacitance between the sensor and the line and the equivalent input capacitance of the detection circuit. The actual voltage of the high-voltage line is calculated by measuring the induced voltage.

3. The high-voltage live display interlocking method with contact input as described in claim 2, characterized in that: The signal feature extraction process includes synchronously acquiring the induced signal, converting it into a digital signal sequence, performing frequency domain interference suppression processing on the digital signal sequence, and analyzing and determining the core feature quantities of the charged state from the signal after interference suppression processing.

4. The high-voltage live display interlocking method with contact input as described in claim 3, characterized in that: The comprehensive logic judgment includes real-time acquisition and monitoring of the energized status signal, the status of multiple external contact input signals, and the insertion and removal and identity information of the anti-misoperation key. The monitored signal status is then matched and verified with the pre-stored safety interlocking rules. Based on the matching and verification results and the preset timing stability conditions, a decision is made and the final control command is generated.

5. A high-voltage live display interlocking method with contact input as described in claim 4, characterized in that: The frequency domain interference suppression process includes applying a fourth-order Butterworth low-pass digital filter to the digital signal sequence, setting the cutoff frequency to 200Hz, and multiplying the filtered data sequence by a Hanning window function for windowing processing. The discrete difference equation of the filter is expressed as: in, Let n be the output value of the filter at the current sampling time. Let be the input value of the filter at the k-th sampling time in the past. Let be the output value of the filter at the k-th sampling time in the past. These are the forward filter coefficients. For the feedback filter coefficients, This is the index of the filter order; The formula for windowing is expressed as follows: in, Let be the window value of the Hanning window function at the m-th sampling point. The index is the sequence number of the sampling point. The length of the data window for the FFT transform. Pi is a constant. For cosine trigonometric functions, The signal sequence after windowing. The output sequence of the filter; The core feature quantities for analyzing and determining the charged state include performing a fast Fourier transform on the windowed data sequence to obtain the spectrum, locating the spectral line corresponding to the 50Hz power frequency from the spectrum, calculating the amplitude of the current spectral line, and using the amplitude as the core feature quantity for determining the charged state.

6. The high-voltage live display interlocking method with contact input as described in claim 5, characterized in that: The safety interlocking rules include requiring all three-phase energized status signals to indicate that they are not energized, and at least one designated circuit breaker or disconnector switch auxiliary contact input signal to indicate that it is open; requiring all three-phase energized status signals to indicate that they are not energized, and the grounding switch auxiliary contact input signal to indicate that it is closed, while the anti-misoperation key interface detects that the preset maintenance key has been correctly inserted. The preset timing stability conditions include that the duration for a signal state combination to match a security interlocking rule must reach a first preset delay threshold before an unlocking command is generated; and if the matching state fails within the first preset delay threshold, an interlocking command is generated immediately. The formula for calculating the timing stability condition is expressed as follows: in, The discharge threshold is... The charge-attracting threshold, The background noise amplitude, The determination coefficient is used to distinguish between charged and uncharged states. The coefficient is used to determine whether a substance is uncharged or charged.

7. A high-voltage live display interlocking method with contact input as described in claim 6, characterized in that: The transfer between safety states driven by the result includes the following: power-on self-test state: after power-on, a self-test is performed. If the self-test passes and any phase is energized, the state is switched to the energized lockout state. If the self-test passes and all three phases are de-energized, the state is switched to the unlocking determination state. If the self-test fails, the state is switched to the fault lockout state. Live-line interlocking state: When all three-phase live-line status signals indicate that the circuit is not live, and the external contact input signal meets the preset safety combination, and the duration of the anti-misoperation key process in the allowed step reaches the second preset delay threshold, the circuit can be transferred to the allowed unlocking judgment state. Allow unlocking determination state: In the current state, the unlocking condition is confirmed. When the condition is stably maintained for a period of time that reaches the third preset delay threshold, the state is switched to the unlock holding state and an unlocking command is output. If the condition fails during the period, the state is returned to the live lockout state. Unlocking and holding state: Outputs unlocking command and allows key operation. When any phase is detected to be energized again or the contact input becomes an unsafe combination, it immediately returns to the energized lockout state. Fault lockout state: Entered when the device self-test is abnormal or a critical fault occurs, outputting a lockout command and prohibiting key operation.

8. A high-voltage live-line display interlocking system with contact input, employing the high-voltage live-line display interlocking method with contact input as described in any one of claims 1 to 7, characterized in that, It includes a high-voltage sensing module, a signal processing module, a lockout logic and execution module, and a human-machine interaction and recording module; The high-voltage sensing module uses three independent capacitive sensors that operate based on the principle of electric field coupling. When the sensors are installed on a high-voltage line, an equivalent coupling capacitor is formed between the line and the sensors, and the line voltage is induced by the capacitor to generate a voltage signal. The signal processing module is used to protect, amplify, and convert analog induction signals to digital signals, suppress high-frequency noise through digital filtering, perform spectrum analysis using fast Fourier transform, separate and calculate the amplitude of the 50Hz power frequency component, and output the status signal of each phase. The interlocking logic and execution module is used to receive energized status signals, auxiliary contact status signals, and anti-misoperation key status signals, and to make a comprehensive judgment based on preset interlocking rules and timing conditions. By driving the relay, it controls the mechanical interlocking device of the high-voltage switchgear to perform electrical operation interlocking and allow unlocking. The human-machine interaction and recording module is used to display the energized status, interlocked status, device self-test results and fault information of each phase in real time through dual-color LED indicator lights and LCD screen, and automatically record key events in a structured format in chronological order.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the high-voltage live display interlocking method with contact input as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the high-voltage live display interlocking method with contact input as described in any one of claims 1 to 7.

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