A method and system for ground tool operation lockout control

Abstract

The present application belongs to the technical field of anti-misoperation locking of power distribution switchgear, and particularly relates to a ground knife operation locking control method and system. The method comprises: acquiring cable side three-phase live display signals, self-check signals, ground knife operation hole state signals, operation handle insertion signals, operation handle rotation trend signals, confirmation action signals and switchgear operation condition signals; performing standardized processing on the three-phase live display signals to determine live support and signal reliability; determining operation intention strength according to the time sequence relationship of ground knife operation related actions; determining the ground knife operation risk level in combination with the live support, signal reliability, operation intention strength and switchgear operation condition, and judging whether the confirmation action is effective; and controlling the ground knife operation hole locking mechanism to execute unlocking, delayed unlocking, keep locking or re-locking according to the risk level and confirmation effective result. The scheme can reduce the risk of mislocking under the condition of abnormal live display signals or ineffective confirmation action.

Description

Technical Field

[0001] This invention belongs to the field of anti-misoperation interlocking technology for power distribution switchgear, and particularly relates to a grounding switch operation interlocking control method and system. Background Technology

[0002] Switchgear typically incorporates a five-prevention interlocking mechanism to prevent accidental opening or closing of circuit breakers, preventing the operation of disconnecting switches under load, preventing the connection of grounding wires or the closing of grounding switches while the circuit is energized, preventing the energization of circuits with grounding wires or grounding switches connected, and preventing accidental entry into energized compartments. For grounding switch operation, existing technologies usually restrict operation through mechanical interlocking conditions such as switch position, grounding switch position, and cabinet door status. A live indicator is also installed on the cable side of the switchgear, allowing operators to observe the indicator before closing the grounding switch and insert the operating handle to operate the grounding switch when there is no live indication. Some improved solutions also incorporate baffles, confirmation buttons, voice prompts, light indicators, or electromagnetic interlocking mechanisms at the grounding switch operating hole to prompt operators to confirm the energized status of the cable side, or to restrict the opening of the grounding switch operating hole when the live indicator outputs a live interlocking signal.

[0003] However, existing grounding switch operation interlocking schemes typically rely directly on a single display status of the live indicator or an interlocking contact to release or lock the switch. This makes it difficult to effectively identify situations such as live indicator signal jitter, contradictory three-phase statuses, abnormal self-test of the live indicator, acquisition channel failure, premature or perfunctory pressing of the confirmation button, and operators skipping confirmation and directly inserting the handle. This can easily lead to problems such as unreliable live status judgments, disconnect between confirmation actions and actual operation processes, and mis-locking or insufficient interlocking control of the grounding switch operating hole. Summary of the Invention

[0004] The purpose of this invention is to provide a grounding bar operation interlocking control method and system to solve the problem in the prior art that grounding bar operation interlocking control relies too much on a single state of the live display or manual confirmation action, making it difficult to reliably restrict grounding bar operation when the live display signal is abnormal or the confirmation action fails.

[0005] To achieve the above objectives, the following solution is adopted: In a first aspect, the present invention provides a method for locking and controlling the operation of a grounding switch, comprising: Acquire the following signals: three-phase live display signal from the cable side, live display self-test signal, grounding switch operating hole status signal, operating handle insertion signal, operating handle rotation trend signal, confirmation action signal, and switch cabinet operating condition signal; The three-phase live display signals on the cable side are standardized to obtain the three-phase live characteristic quantities. The live support is determined based on the three-phase live characteristic quantities, and the signal reliability is determined based on the stability of the three-phase live display signal on the cable side, the consistency between the three-phase live characteristic quantities, and the live display self-test signal. The intensity of the operational intent is determined based on the timing relationship between the status signal of the grounding knife operating hole, the insertion signal of the operating handle, the rotation trend signal of the operating handle, and the confirmation action signal. The risk level of the grounding switch operation is determined based on the live support, signal reliability, strength of the operation intention, and the operating conditions signal of the switchgear. The valid confirmation result is determined based on the live support, signal reliability, live display self-test signal, confirmation action signal, and the time interval between the confirmation action signal and the status signal of the grounding knife operating hole or the operating handle insertion signal. Based on the risk level of the grounding bar operation and the confirmation of the valid results, control instructions for the grounding bar operation hole are generated, and the grounding bar operation hole locking mechanism is controlled to perform unlocking, delayed unlocking, maintaining locking, or relocking according to the grounding bar operation hole control instructions.

[0006] The above solution incorporates the identification of the energized state of the cable side, the judgment of the credibility of the energized display signal, the identification of the grounding switch operation intention, and the judgment of the validity of the confirmation action into the interlocking decision. This solves the problem of misinterpretation of the existing solution that allows grounding switch operation based solely on the single state of the energized display or manual confirmation action. Thus, it achieves the technical effect of reliably interlocking the grounding switch operation hole in the states of energization, suspected energization, unreliable signal, or confirmation failure.

[0007] Furthermore, the three-phase live indication signals on the cable side are standardized to obtain three-phase live characteristic quantities, including: obtaining the non-energized baseline and live reference amplitude corresponding to each phase live indication signal; normalizing the amplitude based on each phase live indication signal, the corresponding non-energized baseline and the corresponding live reference amplitude to obtain the live characteristic quantity of each phase; and limiting the amplitude of each phase live characteristic quantity to ensure that the live characteristic quantity of each phase is within a preset value range.

[0008] The above-mentioned further solution uses a non-electric baseline and an electric reference amplitude to perform uniform scaling on electric display signals from different sources, which solves the problem that electric display signals from different manufacturers, different voltage levels, or different output forms are difficult to use with a unified judgment threshold. This improves the adaptability and consistency of electric status recognition under different switch cabinets and different electric displays.

[0009] Furthermore, the charge support is determined based on the three-phase charge characteristics, including: determining the charge characteristics of phase A, phase B, and phase C respectively; and determining the charge support based on the combined result of the charge characteristics of phase A, phase B, and phase C, such that the charge support increases when the charge characteristic of any phase increases.

[0010] The above-mentioned further scheme determines the charge support by combining the results of the three-phase charge characteristics, which solves the problem that using only the three-phase average value may dilute the risk of single-phase charge, thereby improving the reliability of risk identification in the case of single-phase charge, phase imbalance or local abnormal charge.

[0011] Furthermore, the signal reliability is determined based on the stability of the three-phase live display signal on the cable side, the consistency between the three-phase live characteristic quantities, and the self-test signal of the live display. This includes: determining the signal stability result based on the variation amplitude of the three-phase live display signal on the cable side within a preset time window; determining the three-phase consistency result based on the degree of difference between the three-phase live characteristic quantities; determining the self-test normal result based on the self-test signal of the live display; and determining the signal reliability based on the signal stability result, the three-phase consistency result, and the self-test normal result.

[0012] The above-mentioned further solution uses signal stability, three-phase consistency, and normal self-test results together to judge signal reliability, which solves the problem that live display signal jitter, three-phase inconsistency, or self-test abnormality are easily misjudged as no power, thereby improving the reliability of interlocking decision input data.

[0013] Furthermore, the intensity of the operational intent is determined based on the timing relationship between the grounding switch operating hole status signal, the operating handle insertion signal, the operating handle rotation trend signal, and the confirmation action signal. This includes: determining whether a confirmation action has occurred based on the confirmation action signal; determining whether the grounding switch operating hole is exposed or the baffle is open based on the grounding switch operating hole status signal; determining whether the operating handle is inserted into the grounding switch operating hole based on the operating handle insertion signal; determining whether there is a grounding switch closing operation trend based on the operating handle rotation trend signal; and determining the intensity of the operational intent based on whether the confirmation action, the grounding switch operating hole exposure or baffle opening, the operating handle insertion, and the grounding switch closing operation trend conform to a preset operational sequence.

[0014] The above-mentioned further solution identifies the operation intention by the timing relationship of the grounding bar operation actions, which solves the problem of the disconnect between the prompt or locking action and the actual grounding bar operation process. This improves the relevance of locking and prompting when the operator approaches the actual grounding bar closing action and reduces interference caused by irrelevant prompts.

[0015] Furthermore, the risk level of the grounding switch operation is determined based on the live support, signal reliability, operational intent strength, and switchgear operating condition signals. This includes: determining the switchgear operating condition risk factor based on the switchgear operating condition signals, which include at least one of the following: cabinet door status signal, grounding switch position status signal, switch position status signal, maintenance authorization status signal, or operation ticket status signal; determining the risk value based on the live support, signal reliability, operational intent strength, and switchgear operating condition risk factor; and determining the grounding switch operation risk level based on the risk value, live support, and signal reliability.

[0016] The aforementioned further solution addresses the problem that a single live display judgment cannot cover multiple operational constraints and abnormal states by jointly incorporating the energized state, signal reliability, operational intent, and switchgear operating conditions into the risk level determination, thereby improving the adaptability of interlocking control to changes in on-site operating conditions.

[0017] Furthermore, the risk levels for grounding switch operations include safety-permissible level, alert / confirmation level, suspected live-line interlocking level, strong live-line interlocking level, and fault interlocking level. When the risk level for grounding switch operation is safety-permissible and the confirmation result is valid, the control command for the grounding switch operating hole is an unlocking command or a delayed unlocking command. When the risk level for grounding switch operation is alert / confirmation level, the control command for the grounding switch operating hole is a confirmation prompt command and a hold-lock command. When the risk level for grounding switch operation is suspected live-line interlocking level, strong live-line interlocking level, or fault interlocking level, the control command for the grounding switch operating hole is a hold-lock command or a relock command.

[0018] The above-mentioned further solution addresses the problems of existing interlocking methods, which only offer simple release or interlocking and are difficult to distinguish between warning, suspected live, live, and fault states, by mapping different risk levels to different control outputs. This achieves hierarchical interlocking control and fail-safe control of the grounding switch operating hole.

[0019] Furthermore, based on the live support, signal reliability, live indicator self-test signal, confirmation action signal, and the time interval between the confirmation action signal and the grounding knife operating hole status signal or the operating handle insertion signal, the valid confirmation result is determined, including: within a preset time window before and after the confirmation action, determining whether the live support is continuously lower than the no-power threshold, whether the signal reliability is continuously higher than the reliability threshold, whether the live indicator self-test signal indicates normal self-test, and determining whether the time interval between the confirmation action and the grounding knife operating hole exposure or operating handle insertion does not exceed a preset valid duration; when all the above judgments are true, the valid confirmation result is determined to be valid; when any of the above judgments are false, the valid confirmation result is determined to be invalid.

[0020] The above-mentioned further solution solves the problems of the confirmation button being pressed in advance, remaining valid for a long time, being pressed in a formal way, or still being used as the basis for release under abnormal signal conditions by binding the confirmation action with the trusted power-off state and the timing of subsequent operations. This improves the effectiveness of the confirmation action in constraining the safety control of the grounding switch operation.

[0021] Furthermore, after controlling the grounding switch operating hole locking mechanism to perform unlocking, delayed unlocking, maintaining locking, or relocking according to the grounding switch operating hole control command, the process also includes: recording the live support, signal reliability, operational intent strength, grounding switch operation risk level, confirmation of valid results, grounding switch operating hole control command, and execution feedback information of the grounding switch operating hole locking mechanism; determining whether the grounding switch operating hole locking mechanism has been properly executed based on the execution feedback information; and generating a fault locking command and controlling the grounding switch operating hole locking mechanism to maintain locking or relocking when the grounding switch operating hole locking mechanism has not been properly executed.

[0022] The above-mentioned further solution solves the problems of unverifiable action results and untraceable abnormal events of the interlocking actuator by recording the interlocking decision-making process and execution feedback, and triggering fault interlocking when execution is not in place, thereby improving the closed-loop nature and maintenance traceability of interlocking control.

[0023] In a second aspect, the present invention provides a grounding switch operation interlocking control system, comprising: a data acquisition module for acquiring three-phase live display signals from the cable side, a live display self-test signal, a grounding switch operation hole status signal, an operation handle insertion signal, an operation handle rotation trend signal, a confirmation action signal, and switchgear operation condition signals; a signal standardization module for standardizing the three-phase live display signals from the cable side to obtain three-phase live characteristic quantities; a reliability identification module for determining the live support based on the three-phase live characteristic quantities, and determining the signal reliability based on the stability of the three-phase live display signals from the cable side, the consistency between the three-phase live characteristic quantities, and the live display self-test signal; and an operation intent identification module for identifying the grounding switch operation hole status signal, the operation handle... The timing relationship between the insertion signal, the operating handle rotation trend signal, and the confirmation action signal determines the intensity of the operating intent; the risk decision module is used to determine the risk level of the grounding switch operation based on the live support, signal credibility, intensity of the operating intent, and switchgear operating condition signals; the confirmation validity judgment module is used to determine the confirmation validity result based on the live support, signal credibility, live display self-test signal, confirmation action signal, and the time interval between the confirmation action signal and the grounding switch operating hole status signal or the operating handle insertion signal; the execution control module is used to generate grounding switch operating hole control commands based on the grounding switch operation risk level and the confirmation validity result, and control the grounding switch operating hole locking mechanism to perform unlocking, delayed unlocking, maintaining locking, or relocking according to the grounding switch operating hole control commands.

[0024] The above system and the aforementioned method are based on the same inventive concept. They achieve the standardization of live display signals, reliable identification, operation intention identification, risk decision-making, confirmation of validity and execution control through a modular approach, and can achieve the same or corresponding technical effects.

[0025] In a third aspect, the present invention provides a grounding switch operation locking device, comprising: a grounding switch operation hole assembly, including a grounding switch operation hole and a baffle for blocking or opening the grounding switch operation hole; a live display interface assembly for connecting a three-phase live display signal and a live display self-test signal from the cable side; an operation detection assembly, including a grounding switch operation hole status detection element for detecting the status of the baffle or the grounding switch operation hole, an operation handle insertion detection element for detecting whether the operation handle is inserted into the grounding switch operation hole, an operation handle rotation trend detection element for detecting the rotation trend of the operation handle, and a confirmation detection element for detecting a confirmation action; a switch cabinet status interface assembly for connecting a switch cabinet operation condition signal; a grounding switch operation hole locking mechanism for locking or releasing the baffle or the grounding switch operation hole; and a control system connected to the live display interface assembly, the operation detection assembly, the switch cabinet status interface assembly, and the grounding switch operation hole locking mechanism, respectively; the control system is used for... The three-phase live characteristic quantities are obtained from the three-phase live display signals on the cable side. The live support is determined based on the three-phase live characteristic quantities. The signal reliability is determined based on the stability of the three-phase live display signals on the cable side, the consistency between the three-phase live characteristic quantities, and the self-test signal of the live display. The intensity of the operation intention is determined based on the detection results of the grounding switch operating hole status detection device, the operating handle insertion detection device, the operating handle rotation trend detection device, and the confirmation detection device. The risk level of the grounding switch operation is determined based on the live support, signal reliability, intensity of the operation intention, and the switch cabinet operating condition signal. The valid confirmation result is determined based on the live support, signal reliability, self-test signal of the live display, confirmation action signal, and the time interval between the confirmation action and the exposure of the grounding switch operating hole or the insertion of the operating handle. Based on the risk level of the grounding switch operation and the valid confirmation result, the grounding switch operating hole locking mechanism is controlled to perform unlocking, delayed unlocking, holding lock, or relocking.

[0026] The aforementioned device, through the coordination of the live display interface component, operation detection component, switchgear status interface component, control system, and grounding switch operating hole locking mechanism, enables the aforementioned control method to be implemented at the grounding switch operating hole of the switchgear. It can achieve risk identification, prompting, and locking control of the grounding switch operating hole without changing the main circuit structure of the switchgear. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1A flowchart of a grounding switch operation interlocking control method; Figure 2 This is a structural block diagram of a grounding knife operation interlocking control system. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0029] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0030] This embodiment provides a grounding switch operation interlocking control method, which can be applied to ring main units, medium-voltage switchgear, substation switchgear, distribution room switchgear, and high and low voltage switchgear with cable side live display and grounding switch operation hole.

[0031] like Figure 1 As shown, the method includes: S1. Acquire the three-phase live display signal on the cable side, the live display self-test signal, the grounding switch operating hole status signal, the operating handle insertion signal, the operating handle rotation trend signal, the confirmation action signal, and the switch cabinet operating condition signal. S1. Standardize the three-phase live display signal on the cable side to obtain the three-phase live characteristic quantities; S2. Determine the live support based on the three-phase live characteristic quantities, and determine the signal reliability based on the stability of the three-phase live display signal on the cable side, the consistency between the three-phase live characteristic quantities, and the self-test signal of the live display. S3. Determine the intensity of the operation intention based on the timing relationship between the status signal of the ground knife operating hole, the insertion signal of the operating handle, the rotation trend signal of the operating handle, and the confirmation action signal; S4. Determine the risk level of the grounding switch operation based on the live support, signal reliability, strength of operation intent, and switchgear operation condition signals. S5. Determine the valid confirmation result based on the live support, signal reliability, live display self-test signal, confirmation action signal, and the time interval between the confirmation action signal and the grounding knife operating hole status signal or the operating handle insertion signal. S7. Generate control instructions for the grounding bar operation hole based on the risk level of the grounding bar operation and the confirmed valid results. Control the grounding bar operation hole locking mechanism to perform unlocking, delayed unlocking, maintaining locking or relocking according to the grounding bar operation hole control instructions.

[0032] This method transforms the traditional operation process, which relies on manual observation of the live indicator and manual pressing of the confirmation button, into a closed-loop control process consisting of signal acquisition, reliable identification of the live state, judgment of operational intent, constraint of confirmation validity, and lockout execution. Through this method, the grounding switch operating hole locking mechanism is only unlocked or delayed when the cable side is in a reliable de-energized state, the live indicator self-tests normally, the confirmation action occurs within the effective time window, and the operational risk level allows. When there is liveness, suspected liveness, unreliable signal, invalid confirmation, or device malfunction, the grounding switch operating hole locking mechanism is kept locked or re-locked, thereby reducing the risk of closing the grounding switch while it is live.

[0033] In this embodiment, the three-phase live display signal on the cable side can be a three-phase voltage signal, a three-phase indication status, a pulse signal, a photoelectric signal, a switching signal, or an equivalent status quantity output by the live display. The live display self-test signal indicates whether the live display, acquisition channel, or related detection circuit is in a normal state. The grounding switch operating hole status signal indicates whether the grounding switch operating hole is blocked, whether the baffle is open, or whether the grounding switch operating hole is exposed. The operating handle insertion signal indicates whether the operating handle is inserted into the grounding switch operating hole. The operating handle rotation trend signal indicates whether the operating handle has a rotational action, rotation trend, or change in operating torque. The confirmation action signal indicates whether the operator has triggered the confirmation button or equivalent confirmation component. The switch cabinet operating condition signal indicates the switch cabinet status or authorization status related to the grounding switch operation.

[0034] Specifically, the control commands for the grounding switch operating hole can include unlocking commands, delayed unlocking commands, confirmation commands, hold-lock commands, relock commands, and fault lock commands. The unlocking or delayed unlocking commands are executed by the grounding switch operating hole locking mechanism, which releases the baffle or releases the grounding switch operating hole from its locked state, allowing the operating handle to enter the grounding switch operating hole. Similarly, the hold-lock or relock commands are executed by the grounding switch operating hole locking mechanism, which prevents the operating handle from entering or continuing operation by locking the baffle or blocking the grounding switch operating hole. Confirmation commands can be executed by a light indicator, voice indicator, display screen, or other human-machine interface components to prompt the operator to confirm the live display status or verify any abnormal status.

[0035] In one embodiment, the three-phase live indication signals on the cable side are standardized to obtain three-phase live characteristic quantities, including: obtaining the non-energized baseline and live reference amplitude corresponding to each phase live indication signal; normalizing the amplitude based on each phase live indication signal, the corresponding non-energized baseline and the corresponding live reference amplitude to obtain the live characteristic quantity of each phase; and limiting the amplitude of each phase live characteristic quantity to make each phase live characteristic quantity within a preset value range.

[0036] Specifically, for any phase k among the three phases A, B, and C, the original energized display signal is acquired. The control system can use the no-power baseline obtained by the switchgear or the live indicator during the initialization, maintenance, or self-learning phases. and charged reference amplitude The original live display signal Convert to standardized charged characteristic quantity For example, the following relationship can be used for calculation:

[0037] Where k∈{A,B,C}; ε is a small constant used to prevent the denominator from being zero; clip(·) indicates that the calculation result is restricted to between 0 and 1; The closer a value is to 1, the closer that phase is to being charged. The closer to 0, the closer the phase is to a state of no electricity. No-electric baseline. It can be determined by the live indicator signal when the equipment is in a confirmed no-power state, with a live reference amplitude. It can be determined from initialization, maintenance, calibration, or historical operating data.

[0038] Furthermore, when the output of the live display is in the form of a switching quantity, pulse signal, photoelectric signal, or equivalent state quantity, the control system can first convert the corresponding output into the original live display signal of the corresponding phase. Then, normalization and limiting processing are performed. Thus, live indicators from different manufacturers, with different voltage levels, or different output interface types can all be converted to a unified three-phase live characteristic quantity scale for subsequent judgment.

[0039] The above embodiments introduce a non-electric baseline, an electric reference amplitude, and amplitude limiting processing, so that the electric display signal is no longer limited to the original voltage level or interface form. This can reduce the problem of inconsistent judgment thresholds caused by differences in equipment specifications and improve the recognition adaptability in different switch cabinet retrofits or different electric display access scenarios.

[0040] In one embodiment, determining the charge support based on the three-phase charge characteristics includes: determining the charge characteristics of phase A, phase B, and phase C respectively; and determining the charge support based on the combined result of the charge characteristics of phase A, phase B, and phase C, such that the charge support increases when the charge characteristic of any phase increases.

[0041] Specifically, the energized support is used to represent the degree to which the overall support of the three-phase cable side "has a risk of energization". Considering that any energized phase may lead to the risk of grounding switch failure, it is not appropriate to use only the three-phase average value as the basis for judging the energized state. For example, the energized support E(t) can be determined using the following relationship:

[0042] in, , , Let A, B, and C represent the characteristic quantities of the charge on phases A, B, and C, respectively. This relationship shows that when the characteristic quantity of the charge on any phase increases, the charge support E(t) also increases, thus preventing the risk of a single phase being diluted by the lower values ​​of the other two phases.

[0043] Furthermore, the energized support can also be determined based on the maximum value of the three-phase energized characteristic quantities, the joint probability form, or other joint rules that can reflect the increased risk associated with any phase increase. Regardless of the joint rule used, the energized support should be able to reflect the impact of single-phase, two-phase, or three-phase energization on the risk of grounding switch operation.

[0044] The above embodiments determine the charge support by jointly determining the three-phase charge characteristics, so that the risk of local charge caused by single-phase abnormal charge, phase imbalance or reverse power feeding can be reflected in a timely manner, thereby improving the sensitivity and safety of charge risk identification.

[0045] In one embodiment, determining signal reliability based on the stability of the three-phase live-line indicator signal on the cable side, the consistency between the three-phase live-line characteristic quantities, and the self-test signal of the live-line indicator includes: determining the signal stability result based on the variation amplitude of the three-phase live-line indicator signal on the cable side within a preset time window; determining the three-phase consistency result based on the degree of difference between the three-phase live-line characteristic quantities; determining the self-test normal result based on the self-test signal of the live-line indicator; and determining the signal reliability based on the signal stability result, the three-phase consistency result, and the self-test normal result.

[0046] Specifically, signal reliability is used to characterize whether the current live indicator signal can be used as a reliable basis for the grounding switch operation interlocking decision. Live indicators may experience signal jitter, power loss, sensor circuit abnormalities, contradictory three-phase states, live indicator self-test abnormalities, or acquisition channel failures. Therefore, it is not advisable to directly determine that there is no power when the live indicator support is low. For example, the signal reliability Q(t) can be determined using the following relationship:

[0047] in, This is a signal stability factor, used to reflect whether the three-phase live display signal on the cable side remains stable within a preset time window; This is the self-test normal factor, used to reflect whether the self-test signal of the live display indicates that the self-test is normal; It serves as a three-phase state consistency or rationality factor, used to reflect whether there are obvious contradictions among the three-phase charged characteristic quantities; This is a signal source validity factor, used to reflect whether the signal source, interface, or acquisition channel is valid; It serves as a fault penalty factor, used to reflect fault factors such as self-test faults, acquisition channel faults, and interlock feedback abnormalities. to These are the weighting coefficients.

[0048] Furthermore, when the three-phase live-line indicator signal on the cable side frequently changes within a preset time window, the signal stability result can be reduced; when the difference between the three-phase live-line characteristics exceeds the preset consistency condition and cannot be explained by normal operating conditions, the three-phase consistency result can be reduced; when the live-line indicator self-test signal indicates an abnormality, the normal self-test result can be reduced or the fault lockout related judgment can be directly entered. Therefore, even if the live-line support is temporarily low, if the signal reliability is insufficient, a safe and permissible result will not be directly output, but rather a signal abnormality lockout or a verification state will be entered.

[0049] The above embodiments improve the reliability of the interlocking decision input by comprehensively judging the signal stability, three-phase consistency and self-test status, and can reduce the risk of misjudging no power due to abnormal live display signals.

[0050] In one embodiment, determining the intensity of the operational intent based on the timing relationship of the grounding switch operating hole status signal, the operating handle insertion signal, the operating handle rotation trend signal, and the confirmation action signal includes: determining whether a confirmation action has occurred based on the confirmation action signal; determining whether the grounding switch operating hole is exposed or the baffle is open based on the grounding switch operating hole status signal; determining whether the operating handle is inserted into the grounding switch operating hole based on the operating handle insertion signal; determining whether there is a grounding switch closing operation trend based on the operating handle rotation trend signal; and determining the intensity of the operational intent based on whether the confirmation action, the grounding switch operating hole exposure or baffle opening, the operating handle insertion, and the grounding switch closing operation trend conform to a preset operational sequence.

[0051] Specifically, the intensity of operational intent is used to characterize how close the operator's current behavior is to the actual operation of the cutting tool. For example, the intensity of operational intent I(t) can be determined using the following relationship:

[0052] in, Indicates confirmation of the button press action; This indicates that the baffle is open or the ground knife operating hole is exposed; Indicates that the operating handle has been inserted; This indicates that the control handle is rotating or has a tendency to rotate; This indicates whether the sequence of actions conforms to the normal sequence of "confirm, open, insert, operate"; to This is a weighting coefficient. The higher the intensity of the operational intent, the closer the operator is to the actual operation of the cutting tool; therefore, the more timely and stringent the system prompts and interlocking controls should be.

[0053] Furthermore, when only personnel approaching or confirming actions are detected, it can be determined as the observation or preparation phase; when the baffle is detected to open or the ground knife operating hole is exposed, it can be determined as the preparation operation phase; when the operating handle is detected to be inserted, it can be determined as the insertion phase; when the operating handle rotation trend or operating torque change is detected, it can be determined as the strong operation phase. If the operator skips the confirmation action and directly opens the baffle or inserts the operating handle, the intensity of the operation intent can be increased, and it can trigger a prompt confirmation, relocking, or a suspected violation operation record.

[0054] The above embodiments identify the true operational intent through action timing, matching the prompts and lockout control with the grounding knife operation process, which can reduce irrelevant prompts and improve control strength when the operational risk is close to actual occurrence.

[0055] In one embodiment, determining the grounding switch operation risk level based on live support, signal reliability, operational intent strength, and switchgear operating condition signals includes: determining a switchgear operating condition risk factor based on switchgear operating condition signals, whereby the switchgear operating condition signals include at least one of cabinet door status signals, grounding switch position status signals, switch position status signals, maintenance authorization status signals, or operation ticket status signals; determining a risk value based on live support, signal reliability, operational intent strength, and switchgear operating condition risk factors; and determining the grounding switch operation risk level based on the risk value, live support, and signal reliability.

[0056] Specifically, the switchgear operating condition risk factor G(t) is used to characterize the impact of cabinet door status, current position of the grounding switch, switch position, maintenance authorization status, or operation ticket status related to grounding switch operation on operational risk. For example, the risk value R(t) can be determined using the following relationship:

[0057] Where E(t) is the charge support, Q(t) is the signal confidence, I(t) is the strength of the operational intent, and G(t) is the risk factor of the switchgear operating conditions. to The weighting coefficients are used. The risk decision-making process can determine the risk level of the grounding knife operation based on the combination of the risk value R(t), the charged support E(t), and the signal confidence Q(t), rather than relying solely on a single threshold.

[0058] Furthermore, when the live support is high, even if the intensity of the operation intention is low, it can still be determined as a live-line interlocking level; when the signal reliability is low, even if the live support is low, it can still be determined as a suspected live-line interlocking level or a fault interlocking level; when the intensity of the operation intention increases and the confirmation of the effective result does not meet the requirements, the interlocking can be maintained or re-interlocked; when the live support is low, the signal reliability is high, the operation intention conforms to the timing sequence, and the switchgear operation conditions meet the requirements, it can be determined as a safety-permissible level.

[0059] The above embodiments determine the risk level of the grounding switch operation by fusing multiple factors, enabling the interlocking control to simultaneously consider the energized state, signal reliability, operation progress, and switchgear status, thereby improving the adaptability of risk decision-making under complex field conditions.

[0060] Furthermore, to ensure that each factor in the above formula has a clear basis for acquisition or calculation, this embodiment provides the following explanation for each factor in signal reliability, operational intent strength, and ground knife operation risk value. It should be noted that the following calculation method is an exemplary implementation; those skilled in the art can determine the corresponding factors using equivalent mapping functions, piecewise functions, or lookup table methods without changing the meaning of the factors or the input-output relationship.

[0061] For the signal stability factor in signal confidence Q(t) In one embodiment, the signal stability factor The determination is based on the fluctuation of the three-phase live-line indicator signal or the three-phase live-line characteristic quantity on the cable side within a preset time window. Specifically, within the preset time window before the current time t, the live-line characteristic quantity of phase A is acquired respectively. Phase B charged characteristic quantities and C-phase charged characteristic quantities Multiple sampled values ​​are used to calculate the difference between the maximum and minimum values ​​of the charged characteristic quantity of each phase within the preset time window, thus obtaining the fluctuation quantity D of phase A. A (t), B-phase fluctuation D B (t) and C-phase fluctuation D C (t), and the maximum value among the three-phase fluctuations is determined as the comprehensive fluctuation D(t). A smaller comprehensive fluctuation D(t) indicates a more stable live display signal; a larger comprehensive fluctuation D(t) indicates a less stable live display signal. For example, the signal stability factor... It can be determined in the following way:

[0062] in, The `clip(·)` option sets a preset reference volatility, restricting the calculation result to between 0 and 1. Therefore, when the overall volatility D(t) is less than or equal to the preset reference volatility, the signal stability factor... The signal stability factor decreases as the overall volatility D(t) increases; when the overall volatility D(t) is too large, the signal stability factor... Approaching 0. Preset reference volatility. It can be predetermined based on the output format of the live display, the sampling frequency, the on-site debugging results, or historical operation records.

[0063] For the self-test normality factor in the signal confidence Q(t) In one embodiment, self-testing normal factors Determined by the self-test signal of the live indicator. When the live indicator self-test signal indicates that the live indicator, acquisition channel, or related detection circuit is in a normal state, the self-test normal factor will be activated. The value is determined to indicate a normal self-test result; when the live indicator's self-test signal indicates a self-test abnormality, self-test timeout, or no valid self-test feedback is received, the self-test normal factor is set. The value is determined to indicate a self-test anomaly. For example, when the self-test is normal... Select 1 if there is a self-test error, self-test timeout, or no effective self-test feedback. Take 0.

[0064] For the three-phase state consistency or rationality factor in signal reliability Q(t) In one embodiment, the three-phase state consistency or rationality factor It is determined based on the degree of difference between the three-phase electrical characteristics. Specifically, it is based on the electrical characteristics of phase A. Phase B charged characteristic quantities and C-phase charged characteristic quantities The difference between the maximum and minimum values ​​of the three-phase charged characteristic quantities is determined to obtain the inter-phase difference quantity P(t). A small inter-phase difference quantity P(t) indicates high consistency among the three-phase charged characteristic quantities; a large inter-phase difference quantity P(t) indicates potential contradictions or anomalies in the three-phase state. For example, the three-phase state consistency or rationality factor... It can be determined in the following way:

[0065] in, A preset interphase difference reference value is used. Therefore, the larger the interphase difference value P(t), the greater the consistency or rationality factor of the three-phase state. The lower the value, the better. Preset interphase difference reference value. The parameters can be predetermined based on the switchgear voltage level, the output characteristics of the live indicator, the allowable deviation of three-phase operation, or the results of on-site commissioning. For single-phase energization or three-phase inconsistency under specific maintenance scenarios, the control system can also combine maintenance authorization status signals or operation ticket status signals to... Make corrections.

[0066] For the signal source validity factor in signal confidence Q(t) In one embodiment, the signal source effectiveness factor The signal source validity factor is determined based on the signal interface status, acquisition channel status, or communication status. When the live display interface component is online, the acquisition channel is not disconnected, communication has not timed out, and the received three-phase live display signal from the cable side is a valid signal, the signal source validity factor is set. The value is determined to indicate a valid signal source; when the live display interface component is offline, the acquisition channel is disconnected, communication times out, the signal is lost, or the signal exceeds the interface's valid range, the signal source validity factor is adjusted. This value is determined to indicate that the signal source is invalid. For example, when the signal source is valid... Set to 1 when the signal source is invalid. Take 0.

[0067] For the fault penalty factor in signal reliability Q(t) In one embodiment, the fault penalty factor The fault is determined by fault indicators. Fault indicators may include at least one of the following: live display self-test anomaly indicator, data acquisition channel fault indicator, sensor fault indicator, invalid signal source indicator, and interlocking actuator feedback anomaly indicator. When no of the above fault indicators is detected, a fault penalty factor is applied. The value is determined to represent the absence of a fault penalty; when at least one fault flag is detected, the fault penalty factor is increased based on the number of fault flags or the fault severity. For example, the fault values ​​corresponding to different fault flags can be summed and then subjected to amplitude limiting to obtain the fault penalty factor. When the fault penalty factor When the signal strength is high, the reliability of the signal Q(t) decreases, and the control system is more likely to enter a suspected live-line interlocking state or a fault interlocking state.

[0068] In one embodiment, the weighting coefficients w1 to w5 in the signal reliability Q(t) represent the degree of influence of the signal stability factor, self-test normal factor, three-phase state consistency or rationality factor, signal source validity factor, and fault penalty factor on the signal reliability Q(t). w1 to w5 can be stored as configuration parameters of the control system and can be predetermined based on the type of live display, the form of the acquisition interface, the voltage level of the switchgear, on-site commissioning results, or maintenance safety strategies. For safety-priority application scenarios, the influence of the self-test normal factor, three-phase state consistency or rationality factor, and fault penalty factor can be increased, making it easier to reduce the signal reliability Q(t) when the signal is abnormal, thereby triggering suspected live-line interlocking or fault interlocking.

[0069] For the confirmation action factor in the intensity of operational intent I(t) In one embodiment, the action factor is confirmed. The confirmation action factor is determined by the output of the confirmation detection device. When the confirmation detection device detects that the confirmation button has been pressed, the confirmation switch has been triggered, or other equivalent confirmation actions have occurred, it will generate the confirmation action factor. The value is determined to indicate that a confirmation action has occurred; when no confirmation action is detected, the confirmation action factor is set. This is determined as a value indicating that the confirmation action has not occurred. For example, when the confirmation action has occurred... Set to 1, confirming that the action has not occurred. Take 0.

[0070] For the baffle opening or ground knife operation hole exposure factor in the operational intent intensity I(t). In one embodiment, the baffle is opened or the grounding knife operating hole is exposed. The status is determined by the output of the grounding bar operating hole status detection device. When it detects that the baffle is open, the grounding bar operating hole changes from a covered state to an exposed state, or the grounding bar operating hole is in a state where the operating handle can be inserted, The value is determined to indicate the exposure of the grounding bar operating hole; when the baffle is detected to be closed or the grounding bar operating hole is blocked, The value is determined to indicate that the operating hole of the grounding tool is not exposed.

[0071] For the operating handle insertion factor in the operating intention intensity I(t) In one embodiment, the operating handle insertion factor The output is determined by the insertion of the operating handle into the detection element. When the insertion of the operating handle into the grounding switch operating hole is detected, The value is determined to indicate that the operating handle has been inserted; when no operating handle insertion is detected, it will be... The value is determined to indicate that the operating handle is not inserted.

[0072] For the rotation trend factor in the intensity of operational intent I(t) In one embodiment, the rotation trend factor The output of the operating handle rotation trend detection device determines this. The operating handle rotation trend detection device can detect changes in the operating handle's angular displacement, angular velocity, rotation direction, rotation trigger state, or operating torque. When a change in angular displacement, angular velocity, or torque towards the grounding tool direction is detected, it will... The value is determined to indicate the presence of a tendency to operate the ground-grip tool; when no rotation tendency of the operating handle is detected, The value is determined to indicate the absence of a tendency for the cutting tool to operate. For example, the value can also be determined based on the magnitude of the angular displacement or torque change of the operating handle. It is determined to be a continuous value between 0 and 1.

[0073] For the timing compliance factor in the operational intent intensity I(t) In one embodiment, the timing compliance factor The operation sequence is determined based on whether the confirmation action, exposure of the grounding bar operating hole or opening of the baffle, insertion of the operating handle, and rotation trend of the operating handle conform to a preset operation sequence. The preset operation sequence may include "confirmation, opening, insertion, operation". When a confirmation action is detected, if the grounding bar operating hole exposure or baffle opening, operating handle insertion, and operating handle rotation trend occur sequentially within a preset effective time period, the operation sequence will be determined. The value is determined to indicate timing compliance; when it is detected that the baffle is opened directly without confirmation, the operating handle is inserted directly without confirmation, the operating handle is inserted only after the confirmation action times out, or the rotation trend of the operating handle is earlier than the valid confirmation action, This value is determined to indicate a timing mismatch. The control system can increase the risk level of the grounding switch operation based on the timing mismatch result, or invalidate a confirmed valid result.

[0074] For the weighting coefficients in the intensity of operational intent I(t) to In one embodiment, to It is used to indicate the degree of influence of the confirmation action, the exposure of the ground knife operating hole or the opening of the baffle, the insertion of the operating handle, the rotation trend of the operating handle, and the timing conformity on the intensity of the operating intention I(t). to The parameters can be pre-configured based on how closely each action resembles the actual grounding knife operation. For example, the insertion and rotation trends of the operating handle are closer to the actual grounding knife operation than individual confirmation actions, and therefore can be assigned a higher degree of influence. The timing compliance factor is used to determine whether the operation conforms to the preset safety procedure. When the timing does not conform, the effectiveness of the confirmation action can be reduced or the tendency of risk decision-making to close off can be increased.

[0075] For the switchgear operating condition risk factor G(t) in the risk value R(t), in one embodiment, the switchgear operating condition risk factor G(t) is determined by at least one of the following: cabinet door status signal, grounding switch position status signal, switch position status signal, maintenance authorization status signal, or operation ticket status signal. For example, when the cabinet door status, grounding switch position, switch position, maintenance authorization status, and operation ticket status all meet the conditions for allowing grounding switch operation, G(t) is determined to be a lower risk value; when at least one switchgear operating condition does not meet the conditions for allowing grounding switch operation, G(t) is determined to be a higher risk value. Further, the control system can determine the magnitude of G(t) based on the number of unmet conditions or the risk level; for example, if maintenance authorization is not obtained, the operation ticket status is mismatched, or the switch position does not meet the grounding switch operation conditions, G(t) can be increased, thereby raising the risk value R(t).

[0076] For the weighting coefficients in the risk value R(t) to In one embodiment, to This is used to represent the degree of influence of the live support E(t), the signal unreliability 1-Q(t), the intensity of the operating intent I(t), and the risk factor G(t) of the switchgear operating conditions on the risk value R(t). to It can be stored as configuration parameters for the control system and pre-determined based on switchgear type, voltage level, operation and maintenance procedures, and safety control strategies. To meet the fail-safe principle, when the live support E(t) reaches the strong interlocking condition, the signal confidence Q(t) is lower than the confidence condition, or the live indicator self-test signal indicates an anomaly, the control system can directly determine the grounding switch operation risk level as a strong live interlocking level, a suspected live interlocking level, or a fault interlocking level without relying on the weighted result of the risk value R(t).

[0077] In one embodiment, the thresholds and time parameters used for determining the validity of the confirmation result, including the no-power threshold, the reliable threshold, the energized threshold, the strong interlocking threshold, the preset time window, the preset valid duration, and the intent strength threshold for triggering the confirmation prompt, can be pre-stored in the control system and determined based on the switchgear voltage level, the output format of the energized display, on-site operation and maintenance procedures, equipment debugging results, or historical operation records. These thresholds and time parameters can be updated during equipment initialization, maintenance calibration, or authorization. During operation, the control system calls upon these thresholds and time parameters to determine whether the energized support is lower than the no-power threshold, whether the signal reliability is higher than the reliable threshold, whether the confirmation action is within the valid time window, and whether it is necessary to enter a confirmation prompt, suspected energized interlocking, energized strong interlocking, or fault interlocking state.

[0078] Furthermore, the above factors can be represented using binary, segmented, or continuous quantities. For factors with clearly defined states, such as confirmation action factors, self-test normal factors, and signal source validity factors, binary quantities can be used. For factors that need to reflect changes in degree, such as signal stability factors, three-phase state consistency or rationality factors, rotation trend factors, and switchgear operating condition risk factors, segmented quantities or continuous quantities between 0 and 1 can be used. Regardless of the representation method, the input sources for each factor are the three-phase live-line indicator signal from the cable side, the live-line indicator self-test signal, the grounding switch operating hole status signal, the operating handle insertion signal, the operating handle rotation trend signal, the confirmation action signal, or the switchgear operating condition signal, and these factors are respectively involved in the calculation of signal reliability, operational intent strength, or risk value.

[0079] In one embodiment, the risk level of the grounding switch operation includes a safety allowable level, a reminder confirmation level, a suspected live interlocking level, a strong live interlocking level, and a fault interlocking level. When the risk level of the grounding switch operation is a safety allowable level and the confirmation result is valid, the control command for the grounding switch operation hole is an unlocking command or a delayed unlocking command. When the risk level of the grounding switch operation is a reminder confirmation level, the control command for the grounding switch operation hole is a prompt confirmation command and a hold interlocking command. When the risk level of the grounding switch operation is a suspected live interlocking level, a strong live interlocking level, or a fault interlocking level, the control command for the grounding switch operation hole is a hold interlocking command or a re-interlocking command.

[0080] Specifically, this solution uses a finite state machine to implement the locking control of the grounding switch operating hole. The finite state machine includes at least four states: standby, confirmation prompt, safe standby, suspected live locking, live locking, and fault locking. The entry conditions and control outputs for each state are shown in the table below:

[0081] Furthermore, the delayed unlock command is used to keep the locking mechanism of the grounding switch operating hole in an unlockable state for a preset time window when the confirmed valid result is valid and the risk level is within the safe allowable level. If the operator does not open the baffle or insert the operating handle within the preset time window, the control system cancels the current unlocking condition and relocks. The hold-lock command is used to maintain the current locked state, and the relock command is used to relock after unlocking or delayed unlocking due to state changes, confirmation timeouts, or signal abnormalities.

[0082] The above embodiments, through the corresponding control of different risk levels and finite state machines, enable the latching output to have clear state boundaries, which can avoid the problem that simple binary control cannot effectively handle scenarios such as suspected energization, abnormal signals, or confirmed failure.

[0083] In one embodiment, determining a valid confirmation result based on the power support, signal reliability, power indicator self-test signal, confirmation action signal, and the time interval between the confirmation action signal and the grounding knife operating hole status signal or the operating handle insertion signal includes: within a preset time window before and after the confirmation action, determining whether the power support is continuously lower than the no-power threshold, whether the signal reliability is continuously higher than the reliability threshold, whether the power indicator self-test signal indicates normal self-test, and determining whether the time interval between the confirmation action and the grounding knife operating hole exposure or the operating handle insertion does not exceed a preset valid duration; when all the above determinations are true, the valid confirmation result is determined to be valid; when any of the above determinations are false, the valid confirmation result is determined to be invalid.

[0084] Specifically, the confirmation action is no longer considered a standalone manual authorization switch, but rather a security confirmation trigger condition bound to the trusted identification result of the energized state. The confirmation action can only be used as the basis for unlocking the grounding switch operating hole when the energized support is consistently below the de-energized threshold, the signal trustworthiness is consistently above the trust threshold, the energized indicator self-test is normal, and the confirmation action and subsequent operation actions meet the timing constraints.

[0085] Furthermore, if the confirmation action times out, the live support level increases after confirmation, the signal reliability decreases after confirmation, an abnormal signal occurs before the handle is inserted, the confirmation action occurs in a powered lockout state or a fault lockout state, or the operator skips confirmation and directly inserts the operating handle, the control system will determine the valid confirmation result as invalid and cancel the unlocking conditions corresponding to this confirmation. At this time, the control system can re-enter the confirmation prompt state, the suspected powered lockout state, the powered lockout state, or the fault lockout state.

[0086] The above embodiments, by setting a time window and a reliable no-power constraint for the confirmation action, can prevent the confirmation button from being pressed prematurely, remaining valid for a long time, being pressed in a formal way, or being bypassed, thereby improving the consistency between manual confirmation actions and the actual safety status.

[0087] In one embodiment, after controlling the grounding switch operating hole locking mechanism to perform unlocking, delayed unlocking, maintaining locking, or relocking according to the grounding switch operating hole control command, the method further includes: recording the live support, signal reliability, operation intention strength, grounding switch operation risk level, confirmation of valid results, grounding switch operating hole control command, and execution feedback information of the grounding switch operating hole locking mechanism; determining whether the grounding switch operating hole locking mechanism has been executed properly based on the execution feedback information; and generating a fault locking command and controlling the grounding switch operating hole locking mechanism to maintain locking or relocking when the grounding switch operating hole locking mechanism has not been executed properly.

[0088] Specifically, the execution feedback information can be the positioning feedback of the grounding switch operating hole locking mechanism, the baffle position feedback, the electromagnetic lock engagement or release feedback, the mechanical locking status feedback, or other feedback signals that can characterize the locking execution status. The event logging module can be used to record the energized state identification results, confirmation time, changes in operation intent, changes in risk level, locking output, abnormal states, manual authorized unlocking, and fault codes. The recorded content can be used for subsequent operation and maintenance analysis, threshold calibration, misoperation tracing, and device status assessment.

[0089] Furthermore, when the control system outputs an unlock command but does not receive corresponding unlock feedback, or outputs a hold-lock command but detects that the grounding switch operating hole is in an open state, it can be determined that the grounding switch operating hole locking mechanism has not been properly executed. At this time, the control system generates a fault lock command and outputs fault prompts and lock control to the locking execution component to prevent grounding switch operation from being allowed under the condition of actuator failure.

[0090] The above embodiments, by recording the decision-making process and verifying the execution results, enable the locking control of the grounding knife operating hole to form a closed loop from identification, decision-making, execution to feedback, thereby improving the reliability and traceability of the locking control.

[0091] Example 2 Based on the same inventive concept as in Embodiment 1, such as Figure 2 As shown, This embodiment also provides a grounding bar operation interlocking control system, including a data acquisition module, a signal standardization module, a reliability identification module, an operation intention identification module, a risk decision-making module, a confirmation validity judgment module, and an execution control module.

[0092] The data acquisition module acquires the three-phase live-line indicator signals, live-line indicator self-test signals, grounding switch operating hole status signals, operating handle insertion signals, operating handle rotation trend signals, confirmation action signals, and switchgear operating condition signals from the cable side. The signal standardization module standardizes the three-phase live-line indicator signals from the cable side to obtain three-phase live-line characteristic quantities. The reliability identification module determines the live-line support based on the three-phase live-line characteristic quantities and determines the signal reliability based on the stability of the three-phase live-line indicator signals from the cable side, the consistency between the three-phase live-line characteristic quantities, and the live-line indicator self-test signals. The operation intent identification module determines the intensity of the operation intent based on the timing relationship between the grounding switch operating hole status signals, operating handle insertion signals, operating handle rotation trend signals, and confirmation action signals. The risk decision module determines the risk level of the grounding switch operation based on the live-line support, signal reliability, operation intent intensity, and switchgear operating condition signals. The confirmation validity judgment module determines the validity of the confirmation based on the live-line support, signal reliability, live-line indicator self-test signals, confirmation action signals, and the time interval between the confirmation action signals and the grounding switch operating hole status signals or operating handle insertion signals. The execution control module is used to generate control commands for the grounding bar operation hole based on the risk level of the grounding bar operation and the confirmation of the valid results, and to control the grounding bar operation hole locking mechanism to perform unlocking, delayed unlocking, maintaining locking or relocking according to the grounding bar operation hole control commands.

[0093] Specifically, the data acquisition module can connect to a live display, sensors, confirmation buttons, grounding switch operating hole status detection components, operating handle detection components, switchgear secondary control loops, or operation ticket authorization interfaces. The signal standardization module, reliable identification module, operation intent identification module, risk decision-making module, confirmation validity judgment module, and execution control module can be implemented by different functional units within the same controller, or they can be implemented collaboratively by the switchgear secondary control unit, intelligent lock control unit, or live display expansion module. Intermediate results are transmitted between modules according to the data flow method described above, avoiding data idling or control commands having no execution target.

[0094] Furthermore, the control system may also include an event logging module. This module records the results of energized state identification, confirmation time, changes in operational intent, interlock output, abnormal states, manual authorization for unlocking, and interlock execution feedback, forming a traceable record to prevent misoperation. The data recorded by the event logging module can be used for subsequent operation and maintenance analysis, threshold calibration, and misoperation tracing.

[0095] The system implements the aforementioned ground switch operation interlocking control method through a modular structure, which can be flexibly deployed in different types of switchgear. It also directly links the execution control module with the ground switch operation hole interlocking mechanism to ensure that the risk level and the confirmed valid result can be converted into actual interlocking action.

[0096] Example 3 Based on the same inventive concept as Embodiment 1, this embodiment also provides a grounding switch operation locking device. The device includes a grounding switch operation hole assembly, a live display interface assembly, an operation detection assembly, a switchgear status interface assembly, a grounding switch operation hole locking mechanism, and a control system. The grounding switch operation hole assembly includes a grounding switch operation hole and a baffle for blocking or opening the grounding switch operation hole. The live display interface assembly is used to connect to the three-phase live display signal and the live display self-test signal from the cable side. The operation detection assembly includes a grounding switch operation hole status detection element for detecting the status of the baffle or grounding switch operation hole, an operation handle insertion detection element for detecting whether the operation handle is inserted into the grounding switch operation hole, an operation handle rotation trend detection element for detecting the rotation trend of the operation handle, and a confirmation detection element for detecting a confirmation action. The switchgear status interface assembly is used to connect to the switchgear operation condition signal. The grounding switch operation hole locking mechanism is used to lock or release the baffle or grounding switch operation hole. The control system is connected to the live display interface assembly, the operation detection assembly, the switchgear status interface assembly, and the grounding switch operation hole locking mechanism, respectively.

[0097] Specifically, the grounding bar operating hole status detection component can detect whether the baffle is open, closed, the grounding bar operating hole is blocked, or the grounding bar operating hole is exposed; the operating handle insertion detection component can detect whether the operating handle has entered the grounding bar operating hole; the operating handle rotation trend detection component can detect whether the operating handle has a rotational action, rotation trend, or change in operating torque; the confirmation detection component can be a confirmation button, confirmation switch, or equivalent confirmation detection component. The grounding bar operating hole locking mechanism can be a mechanical locking mechanism, an electromagnetic locking mechanism, or a locking mechanism combining mechanical and electromagnetic mechanisms, and its action object is the baffle or the grounding bar operating hole.

[0098] Furthermore, the control system obtains three-phase live characteristic quantities based on the three-phase live display signals from the cable side connected to the live display interface component, determines the live support based on the three-phase live characteristic quantities, and determines the signal reliability based on the stability of the three-phase live display signals from the cable side, the consistency between the three-phase live characteristic quantities, and the live display self-test signal. It determines the intensity of the operation intent based on the detection results of the operation detection component; determines the risk level of the grounding switch operation based on the live support, signal reliability, intensity of the operation intent, and switchgear operation condition signals; determines the valid confirmation result based on the live support, signal reliability, live display self-test signal, confirmation action signal, and the time interval between the confirmation action and the exposure of the grounding switch operation hole or the insertion of the operation handle; and controls the grounding switch operation hole locking mechanism to perform unlocking, delayed unlocking, maintaining locking, or re-locking based on the grounding switch operation risk level and the valid confirmation result.

[0099] The device can be implemented using an external passive method, an external active method, a built-in intelligent interlocking method, or a unified standardized interface method. In the external passive method, a default-obstructing baffle and a conspicuous confirmation detection element can be installed outside the existing switchgear's grounding switch operating hole. A mechanical linkage is formed between the confirmation detection element and the baffle to reinforce the habit of confirming before operating. In the external active method, an operating handle insertion detection element, a grounding switch operating hole status detection element, a prompting component, and a control system can be added to the external baffle and confirmation detection element. When the operating handle is inserted or the baffle is opened, the control system triggers a prompt and collects or reads the status signal from the live indicator. In the built-in intelligent interlocking method, the signal acquisition, standardized processing, risk decision-making, and interlocking execution components can be installed inside the switchgear during factory manufacturing or modification, and an interface can be established with the live indicator, the grounding switch operating hole interlocking mechanism, and the secondary control circuit. In the unified standardized interface implementation, the control system records the de-energized baseline B_k and the energized reference amplitude H_k during initialization to form a standardized parameter table for the cabinet or the equipment of that model. In subsequent operation, the standardized three-phase energized characteristic quantities, energized support, and signal reliability are used for judgment.

[0100] This device, through the coordination between the basic mechanical structure, data acquisition components, control system and actuator, enables the identification and interlocking control of grounding switch operation risks to be directly applied to the grounding switch operation hole, avoiding the problem of only software judgment without actual interlocking objects, and is easy to implement in the renovation of existing switchgear and the manufacturing of new switchgear.

[0101] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the above embodiments or examples is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0102] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A method for locking and controlling the operation of a grounding switch, characterized in that, include: Acquire the following signals: three-phase live display signal from the cable side, live display self-test signal, grounding switch operating hole status signal, operating handle insertion signal, operating handle rotation trend signal, confirmation action signal, and switch cabinet operating condition signal; The three-phase live display signals on the cable side are standardized to obtain the three-phase live characteristic quantities. The live support is determined based on the three-phase live characteristic quantities, and the signal reliability is determined based on the stability of the three-phase live display signal on the cable side, the consistency between the three-phase live characteristic quantities, and the live display self-test signal. The intensity of the operational intent is determined based on the timing relationship between the status signal of the grounding knife operating hole, the insertion signal of the operating handle, the rotation trend signal of the operating handle, and the confirmation action signal. The risk level of the grounding switch operation is determined based on the live support, signal reliability, strength of the operation intention, and the operating conditions signal of the switchgear. The valid confirmation result is determined based on the live support, signal reliability, live display self-test signal, confirmation action signal, and the time interval between the confirmation action signal and the status signal of the grounding knife operating hole or the operating handle insertion signal. Based on the risk level of the grounding bar operation and the confirmed valid results, control instructions for the grounding bar operation hole are generated. Based on the control instructions for the grounding bar operation hole, the locking mechanism of the grounding bar operation hole is controlled to perform unlocking, delayed unlocking, maintaining locking, or relocking.

2. The grounding bar operation interlocking control method according to claim 1, characterized in that, The three-phase live indication signal on the cable side is standardized to obtain the three-phase live characteristic quantities, including: Obtain the baseline of no voltage and the reference amplitude of voltage corresponding to the voltage display signal of each phase; The amplitude is normalized based on the charged display signal of each phase, the corresponding non-charged baseline and the corresponding charged reference amplitude to obtain the charged characteristic quantity of each phase. The electrical characteristic quantities of each phase are limited to ensure that they are within a preset range.

3. The grounding bar operation interlocking control method according to claim 1, characterized in that, Determining the charge support based on three-phase charge characteristics includes: Determine the characteristic quantities of the charge in phase A, phase B, and phase C respectively; The charge support is determined based on the combined results of the charge characteristics of phase A, phase B, and phase C, such that the charge support increases when the charge characteristic of any phase increases.

4. The grounding bar operation interlocking control method according to claim 1, characterized in that, The reliability of the signal is determined based on the stability of the three-phase live indicator signal on the cable side, the consistency between the three-phase live characteristic quantities, and the self-test signal of the live indicator, including: The signal stability result is determined based on the variation amplitude of the three-phase live display signal on the cable side within a preset time window. The three-phase consistency result is determined based on the degree of difference between the three-phase electrical characteristic quantities; Determine the normal self-test result based on the self-test signal from the live indicator; The reliability of the signal is determined based on the signal stability results, the three-phase consistency results, and the self-test normal results.

5. The grounding bar operation interlocking control method according to claim 1, characterized in that, The intensity of the operational intent is determined based on the timing relationship between the status signal of the grounding tool operating hole, the insertion signal of the operating handle, the rotation trend signal of the operating handle, and the confirmation action signal, including: Determine whether a confirmation action has occurred based on the confirmation action signal; Determine whether the grounding knife operating hole is exposed or whether the baffle is open based on the status signal of the grounding knife operating hole; Determine whether the operating handle is inserted into the ground knife operating hole based on the operating handle insertion signal; Determine whether there is a tendency for the ground-mounted knife to operate based on the rotation trend signal of the operating handle; The intensity of the operational intent is determined by confirming the action, whether the grounding knife operating hole is exposed or the baffle is opened, whether the operating handle is inserted, and whether the grounding knife operation trend conforms to the preset operation sequence.

6. The grounding bar operation interlocking control method according to claim 1, characterized in that, The risk level of the grounding switch operation is determined based on the live support, signal reliability, strength of operational intent, and switchgear operating condition signals, including: The risk factors of switchgear operation conditions are determined based on the switchgear operation condition signals. The switchgear operation condition signals include at least one of the following: cabinet door status signal, grounding switch position status signal, switch position status signal, maintenance authorization status signal, or operation ticket status signal. The risk value is determined based on the live support, signal credibility, strength of operational intent, and risk factors of switchgear operating conditions. The risk level of the grounding knife operation is determined based on the risk value, electrical support, and signal reliability.

7. The grounding bar operation interlocking control method according to claim 1, characterized in that, The risk levels of grounding switch operation include safety allowable level, warning confirmation level, suspected live interlock level, strong live interlock level, and fault interlock level. When the risk level of the grounding tool operation is at the safe level and the confirmed result is valid, the control command for the grounding tool operation hole is an unlock command or a delayed unlock command. When the risk level of the grounding tool operation is the reminder and confirmation level, the control commands for the grounding tool operation hole are the reminder and confirmation command and the keep locked command. When the grounding switch operation risk level is suspected to be energized, energized, or fault-locked, the grounding switch operation hole control command is either a hold-lock command or a relock command.

8. The grounding bar operation interlocking control method according to claim 1, characterized in that, The validity of the confirmation result is determined based on the live support, signal reliability, live indicator self-test signal, confirmation action signal, and the time interval between the confirmation action signal and the status signal of the grounding knife operating hole or the operating handle insertion signal, including: Within the preset time window before and after the confirmation action, determine whether the live support is continuously lower than the no-power threshold, whether the signal confidence is continuously higher than the confidence threshold, whether the live display self-test signal indicates that the self-test is normal, and whether the time interval between the confirmation action and the exposure of the ground knife operating hole or the insertion of the operating handle does not exceed the preset effective time. If all of the above judgments are true, the confirmed result will be deemed valid. If any of the above judgments is not true, the valid result will be determined as invalid.

9. The grounding bar operation interlocking control method according to claim 1, characterized in that, After controlling the locking mechanism of the grounding bar operating hole to perform unlocking, delayed unlocking, maintaining locking, or relocking according to the control command of the grounding bar operating hole, it also includes: Record the live support, signal reliability, intensity of operation intent, risk level of grounding switch operation, confirmation of valid results, control commands for grounding switch operation holes, and execution feedback information of the grounding switch operation hole locking mechanism; Determine whether the locking mechanism of the ground knife operating hole has been properly executed based on the execution feedback information; When the grounding switch operating hole locking mechanism fails to perform properly, a fault locking command is generated and the grounding switch operating hole locking mechanism is controlled to remain locked or relock.

10. A grounding switch operation interlocking control system, characterized in that, include: The data acquisition module is used to acquire the three-phase live display signal on the cable side, the live display self-test signal, the grounding switch operating hole status signal, the operating handle insertion signal, the operating handle rotation trend signal, the confirmation action signal, and the switch cabinet operating condition signal. The signal standardization module is used to standardize the three-phase live display signal on the cable side to obtain the three-phase live characteristic quantities. The reliable identification module is used to determine the live support based on the three-phase live characteristics and to determine the signal reliability based on the stability of the three-phase live display signal on the cable side, the consistency between the three-phase live characteristics, and the live display self-test signal. The operation intent recognition module is used to determine the intensity of the operation intent based on the timing relationship between the ground knife operation hole status signal, the operation handle insertion signal, the operation handle rotation trend signal, and the confirmation action signal. The risk decision module is used to determine the risk level of the grounding switch operation based on the live support, signal credibility, strength of operation intent, and switchgear operation condition signals. The validity determination module is used to determine the validity of the confirmation based on the live support, signal reliability, live display self-test signal, confirmation action signal, and the time interval between the confirmation action signal and the status signal of the grounding knife operating hole or the insertion signal of the operating handle. The execution control module is used to generate control commands for the grounding bar operation hole based on the risk level of the grounding bar operation and the confirmation of the valid results. Based on the grounding bar operation hole control commands, the grounding bar operation hole locking mechanism is controlled to perform unlocking, delayed unlocking, maintaining locking, or relocking.

Images