CN211744020U - Arc tube management intelligent line selection device - Google Patents
Arc tube management intelligent line selection device Download PDFInfo
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- CN211744020U CN211744020U CN202020479798.3U CN202020479798U CN211744020U CN 211744020 U CN211744020 U CN 211744020U CN 202020479798 U CN202020479798 U CN 202020479798U CN 211744020 U CN211744020 U CN 211744020U
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Abstract
The utility model relates to an electric power protection technical field, and disclose arc lamp management intelligence route selection device, including high-voltage isolator GN, three-phase combination formula large capacity overvoltage protection ware KYB, PT high-voltage fuse RD, anti saturation voltage transformer TV, harmonic elimination device XX, single-phase eddy current drive quick circuit breaker Ka, Kb, Kc, zero sequence current transformer 1LH, purpose-made resistance R, single-phase eddy current drive quick circuit breaker ARSa, ARSb, ARSc, intelligent microcomputer control route selection device ZK, zero sequence current transformer 2LH, the upper end and the generating line electricity of high-voltage isolator GN are connected. This arc light management intelligence line selection device through a plurality of quick circuit breakers and purpose-built resistance R component instantaneous increase fault point electric current, accurately selects the fault line, turns into metal ground connection with arc light ground connection through quick circuit breaker, can effectively eliminate arc light ground connection overvoltage, avoids the electrical equipment damage accident that arc light ground connection arouses, improves the power supply reliability.
Description
Technical Field
The utility model relates to an electric power protection technical field specifically is an arc tube management intelligence line selection device.
Background
The medium voltage system in China has various neutral point grounding modes including arc suppression coil, neutral point grounding resistance device and arc and resonance suppression cabinet. The main function of the arc suppression coil is to compensate the single-phase grounding capacitance current of the system, and the arc is automatically extinguished after compensation, but from the practical operation experience of the power system, a plurality of defects still exist: the arc suppression coil only compensates power frequency capacitance current, the current actually passing through the grounding point not only has capacitance current but also contains a large amount of high-frequency current and resistive current, and the arc can be continuously burnt only by the high-frequency current and the resistive current in serious conditions, which cannot be solved by the arc suppression coil; the line is difficult to find a single-phase grounding fault line, the current of a fault point becomes small after compensation, the line selection success rate of a plurality of small-current grounding line selection methods is not ideal, a trial pulling method is often adopted, and when the trial pulling method is adopted, the short-time power failure of a non-fault line is caused, and the operation overvoltage is caused.
The main advantage of the low-resistance grounding system is that the overvoltage level of the system is low, and a grounding fault line can be found out quickly to disconnect the fault line, but the following disadvantages exist: the power supply reliability is low, when the system is subjected to transient arc grounding or short-time grounding caused by other factors, the system cannot extinguish the arc and must be tripped immediately; the safety is poor, when the system is in single-phase grounding, the grounding current is very large, the personal near the grounding point is threatened greatly, and other equipment can be burnt out by the large current.
The arc suppression cabinet is used for converting arc grounding into stable metallic grounding and transferring fault points, but has the following defects: after the fault point is transferred, the existing small-current grounding line selection device is difficult to accurately select the fault point, and only a trial pulling method can be adopted to search a fault line; the arc suppression cabinets are installed in all high distribution chambers from the total descending in one system, whether arc light grounding occurs or not is judged through sampling voltage signals of a voltage transformer, the voltage on one bus is the same, when the system is in single-phase grounding, a plurality of arc suppression cabinets on the system act simultaneously, multiple points of the bus are grounded, and fault points cannot be found.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Not enough to prior art, the utility model provides an arc lamp management intelligence line selection device possesses the advantage that the practicality is good, has solved the problem of proposing among the above-mentioned background art.
(II) technical scheme
In order to achieve the above object, the utility model provides a following technical scheme: an arc tube management intelligent line selection device comprises a high-voltage isolating switch GN, a three-phase combined high-capacity overvoltage protector KYB, a PT high-voltage fuse RD, an anti-saturation voltage transformer TV, a primary resonance elimination device XX, single-phase eddy current driving fast circuit breakers Ka, Kb and Kc, a zero-sequence current transformer 1LH, a special resistor R, a single-phase eddy current driving fast circuit breaker ARSa, ARSb and ARSc, an intelligent microcomputer control line selection device ZK and a zero-sequence current transformer 2LH, wherein the upper end of the high-voltage isolating switch GN is electrically connected with a bus, the lower end of the high-voltage isolating switch GN is electrically connected with the upper end of the three-phase combined high-capacity overvoltage protector KYB, the lower end of the high-voltage isolating switch GN is electrically connected with the upper end of the high-voltage fuse RD, the lower end of the high-voltage isolating switch GN is electrically connected with the anti-saturation voltage transformer TV through the PT high-, the lower end of the anti-saturation voltage transformer TV is electrically connected with one end of an intelligent microcomputer control line selection device ZK, the lower end of a high-voltage isolating switch GN is electrically connected with the upper ends of single-phase eddy current driving quick breakers Ka, Kb and Kc, the lower ends of the single-phase eddy current driving quick breakers Ka, Kb and Kc are electrically connected with the upper end of a zero sequence current transformer 1LH, the lower end of the high-voltage isolating switch GN is electrically connected with the upper ends of the single-phase eddy current driving quick breakers ARSa, ARSb and ARSc, the lower end of the high-voltage isolating switch GN is electrically connected with the upper end of a specially-made resistor R through the single-phase eddy current driving quick breakers ARSa, ARSb and ARSc, the lower end of the specially-made resistor R is electrically connected with the upper end of the single-phase eddy current driving quick breaker AR.
Preferably, the special resistor R is an element having the same function as a capacitive element or an inductive element.
Preferably, the lower end of the high-voltage isolating switch GN is grounded through a three-phase combined high-capacity overvoltage protector KYB, a neutral point of the anti-saturation voltage transformer TV is grounded through a primary harmonic elimination device XX, the lower end of the high-voltage isolating switch GN is grounded through single-phase eddy current driving quick breakers Ka, Kb and Kc, the switching-off time of the single-phase eddy current driving quick breakers Ka, Kb and Kc is less than or equal to 5ms, the switching-on time of the single-phase eddy current driving quick breakers ARSL is less than or equal to 20ms, the lower end of the high-voltage isolating switch GN is grounded through a single-phase eddy current driving quick breaker ARSL after being connected with a special resistor R in series, the switching-off time of the single-phase eddy current driving quick breaker ARSL and the single-phase eddy current.
Preferably, the lower ends of the single-phase eddy current driving fast breakers Ka, Kb and Kc and the single-phase eddy current driving fast breakers ARSa, ARSb and ARSc are electrically connected with the upper end of the intelligent microcomputer control line selection device ZK.
Preferably, the single-phase eddy current driving fast breakers Ka, Kb and Kc and the single-phase eddy current driving fast breakers ARSa, ARSb and ARSc are electrical components having the same functions as vacuum contactors, switches and the like.
(III) advantageous effects
Compared with the prior art, the utility model provides an arc tube management intelligence line selection device possesses following beneficial effect:
1. this arc light management intelligence line selection device is applied to the ungrounded system of neutral point, replaces the PT cabinet, through a plurality of quick circuit breakers and purpose-built resistance R component instantaneous increase fault point electric current, and the fault line is elected to the accuracy, turns into metal ground connection with arc light ground connection through quick circuit breaker, can effectively eliminate arc light ground connection overvoltage, avoids the electrical equipment damage accident that arc light ground connection arouses, improves the power supply reliability.
2. The arc tube management intelligent line selection device adopts single-phase eddy current to drive rapid circuit breakers ARSa, ARSb and ARScc, the switching-off time is less than or equal to 5ms, the switching-on time is less than or equal to 20ms, the circuit breakers are grounded in series with a special resistor R, the rapid characteristic of the circuit breakers is utilized, high-energy resistors are rapidly and accurately put in and taken out, a fault line is accurately selected by utilizing the current of an instantaneously increased fault point, the accuracy of line selection reaches 100 percent, the single-phase eddy current is adopted to drive the circuit breakers Ka, Kb and Kc to be grounded, the switching-off time is less than or equal to 5ms, the switching-on time is less than or equal to 20ms, after the intelligent microcomputer controls the line selection device to accurately select the fault line, the intelligent microcomputer controls the line selection device to send a switching-on command to the single-phase eddy current to drive the circuit breakers Ka, Kb and Kc, the arc grounding is converted, after the abnormal operation of the device occurs, if the system has two different short circuits, the device can send a tripping command within 3ms, and the grounding fast breaker withdraws from the grounding phase within 10ms in total within 5ms of internal breaking, so as to prevent two-phase short circuit.
3. The arc tube management intelligent line selection device adopts an anti-saturation voltage transformer TV to replace a voltage transformer in a conventional PT cabinet, the transformer can effectively inhibit ferromagnetic resonance and reduce the damage of resonance to equipment, a primary resonance elimination device XX is arranged at a neutral point of the anti-saturation voltage transformer TV, the primary resonance elimination device XX can effectively inhibit the ferromagnetic resonance of the anti-saturation voltage transformer TV and reduce the damage of resonance to the equipment, a specially-made high-energy resistor R element is adopted, the resistor element has the advantages of small volume, convenient installation, large absorbed energy and the like, the arc tube management intelligent line selection device is matched with a single-phase eddy current driving quick circuit breaker ARSL to limit single-phase grounding current so that the grounding current is in a safety range and meets the requirement of line selection accuracy, the opening time of the circuit breaker is less than or equal to 5ms, the closing time is less than or equal to 20ms, and the circuit breaker serving as a backup protection to prevent the quick circuit breaker, the two-phase short circuit accident is caused by the burning out of the resistor.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, an arc tube management intelligent line selection device comprises a high-voltage isolating switch GN, a three-phase combined large-capacity overvoltage protector KYB, a PT high-voltage fuse RD, an anti-saturation voltage transformer TV, a primary resonance elimination device XX, a single-phase eddy current driving fast breaker Ka, Kb, Kc, a zero-sequence current transformer 1LH, a special resistor R, a single-phase eddy current driving fast breaker ARSa, ARSb, ARSc, an intelligent microcomputer control line selection device ZK and a zero-sequence current transformer 2LH, wherein the upper end of the high-voltage isolating switch GN is electrically connected with a bus, the lower end of the high-voltage isolating switch GN is electrically connected with the upper end of the three-phase combined large-capacity overvoltage protector KYB, the lower end of the high-voltage isolating switch GN is electrically connected with the upper end of the PT high-voltage fuse RD, the lower end of the high-voltage isolating switch GN is electrically connected with the anti-saturation voltage transformer TV, the lower end of an anti-saturation voltage transformer TV is electrically connected with one end of an intelligent microcomputer control line selection device ZK, the intelligent microcomputer control line selection device ZK calculates through a microcomputer processor for detecting system voltage change, the grounding property and the grounding phase can be accurately judged and processed, the lower end of a high-voltage isolating switch GN is electrically connected with the upper ends of single-phase eddy current driving quick breakers Ka, Kb and Kc, the lower ends of the single-phase eddy current driving quick breakers Ka, Kb and Kc are electrically connected with the upper end of a zero-sequence current transformer 1LH, the lower end of the high-voltage isolating switch GN is electrically connected with the upper ends of single-phase eddy current driving quick breakers ARSa, ARSb and ARSc, the lower ends of the single-phase eddy current driving quick breakers Ka, Kb and Kc and the single-phase eddy current driving quick breakers ARSa, ARSb and ARSc are electrically connected with the upper end of the intelligent microcomputer control line, Kb. Kc and single-phase eddy current driving fast breakers ARSa, ARSb and ARSc are electric elements with the same effects as a vacuum contactor, a switch and the like, an adopted intelligent microcomputer control line selection device ZK comprises a microcomputer processor, a power supply module, an alternating current input signal acquisition module, a switching value acquisition module and a display module, wherein the power supply module, the alternating current input signal acquisition module, the switching value acquisition module and the display module are connected to the microcomputer processor, the intelligent microcomputer control line selection device ZK can accurately judge which phase of a single-phase grounding fault is through acquiring the voltage change of the secondary side of a voltage transformer, the grounding point fault current is increased through controlling the switching of the eddy current breaker connected with a special resistor R in series, a fault line is accurately selected through sampling the current change of a feeder line loop zero sequence current transformer, the arc grounding is converted into stable metallic grounding through controlling the switching-on of the eddy current breaker after the fault line is selected, and the lower end of, ARSb and ARSc are electrically connected with the upper end of a special resistor R, the special resistor R is an element with the same effect as a capacitance element and an inductance element, the lower end of the special resistor R is electrically connected with the upper end of a single-phase eddy current driving fast breaker ARSL, the lower end of a high-voltage isolating switch GN is grounded through a three-phase combined large-capacity overvoltage protector KYB, the neutral point of an anti-saturation voltage transformer TV is grounded through a primary harmonic elimination device XX, the lower end of the high-voltage isolating switch GN is grounded through single-phase eddy current driving fast breakers Ka, Kb and Kc, the opening time of the single-phase eddy current driving fast breakers Ka, Kb and Kc is less than or equal to 5ms, the closing time is less than or equal to 20ms, the lower end of the high-voltage isolating switch GN is connected with the special resistor R in series and then drives the fast breaker ARSL to be grounded through the single-phase eddy current driving fast, and the closing time is less than or equal to 20ms, and the lower end of the single-phase eddy current driving rapid breaker ARSL is electrically connected with the upper end of the zero sequence current transformer 2 LH.
The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like. High-voltage isolating switch GN, 2, three-phase combined high-capacity overvoltage protector KYB, 3, PT high-voltage fuse RD, 4, anti-saturation voltage transformer TV, 5, primary harmonic elimination device XX,6, single-phase eddy current driving fast circuit breakers Ka, Kb, Kc, 7, zero sequence current transformer 1LH,8, single-phase eddy current driving fast circuit breaker ARSa, ARSb, ARSc, 9, special resistor R, 10, single-phase eddy current driving fast circuit breakers ARSL,11, zero sequence current transformer 2LH, 12, intelligent microcomputer control line selection device ZK
When in use, when in normal operation, the high-voltage isolating switch GN is switched on, the single-phase eddy current driving fast breakers Ka, Kb and Kc and the single-phase eddy current driving fast breakers ARSa, ARSb, ARSc and ARSL are switched off, the single-phase eddy current driving fast breaker ARSL is switched on, the anti-saturation voltage transformer TV is connected with a bus through the PT high-voltage fuse RD, the anti-saturation voltage transformer TV detects the voltage of a measuring system in real time and outputs the voltage to secondary measuring equipment, when the system has atmospheric overvoltage and operating overvoltage, the three-phase combined overvoltage protector KYB is put into operation to limit the system overvoltage in a safety range allowed by the insulation of the electrical equipment, the intelligent microcomputer control line selection device ZK acquires signals of three-phase voltages Ua, Ub and Uc provided by the anti-saturation voltage transformer TV, the signals of the three-phase voltages Ua, Ub and Uo and the like and the signals are, the intelligent microcomputer control line selection device ZK calculates by a microcomputer processor for detecting the voltage change of the system, can accurately judge the grounding property and the grounding phase and process the same, if the fault of the system is metallic grounding, the switching value acquisition module of the intelligent microcomputer control line selection device ZK monitors the change of the fault in real time after acquiring the grounding phase, the fault is eliminated after time delay, the fault is instantaneous metallic grounding, the system recovers to normal operation, if the fault still exists after time delay, the fault is permanent metallic grounding fault, the intelligent microcomputer control line selection device ZK sends a command to single-phase eddy current quick breakers ARSa, ARSb and ARSc of non-fault phase after determining that the fault is permanent metallic grounding, (A phase arc grounding is switched into B phase quick breakers, B phase arc grounding is switched into C phase quick breakers, C phase arc grounding is switched into A phase quick breakers) for a plurality of milliseconds, and then the intelligent microcomputer control line selection device ZK switches on The single-phase fast breaker of the brake sends out a brake-separating command, the breaker separates the brake, a resistance current is injected through a resistance butt joint point in the single-phase fast breaker putting process, the current of a fault point is increased, a line selection module of an intelligent microcomputer control line selection device ZK accurately selects a fault line through calculation and analysis by sampling the current change of a zero sequence current transformer of a feeder line cabinet, if the fault is intermittent arc grounding, a switching value acquisition module of the intelligent microcomputer control line selection device ZK sends out a closing command to single-phase eddy current fast breakers Ka, Kb and Kc of a grounding phase after acquiring the phase of the grounding, the single-phase fast breaker of the fault phase closes to enable the system to be quickly converted into stable metallic grounding from unstable arc grounding, the voltage of the fault phase drops to zero, the arc light of the fault point extinguishes, and the intelligent microcomputer control line selection device ZK sends out the brake-separating command to the grounded single-phase fast, the single-phase fast breaker opens the brake, if the trouble disappears, this trouble is the instantaneous arc light ground, the system resumes normal operation, if after the single-phase fast breaker breaks off, the unstable arc light ground continues to appear in the former trouble phase, the trouble is permanent arc light ground fault, the single-phase fast breaker opens the brake back intelligence microcomputer control line selection device ZK sends the command of closing a floodgate simultaneously to the fast breaker of ground phase, the single-phase fast breaker closes a floodgate, change unstable arc light ground into stable metallicity ground fast, the trouble phase voltage drops to zero, trouble point arc light extinguishes, intelligence microcomputer control line selection device ZK sends alarm signal and shows the fault type, the trouble phase is other and the fault line of ground connection.
To sum up, this arc tube management intelligence line selection device is applied to the ungrounded system of neutral point, replaces the PT cabinet, through a plurality of quick circuit breakers and purpose-built resistance R component instantaneous increase fault point electric current, accurately selects the fault line, turns into metal ground connection with arc light ground connection through quick circuit breaker, can effectively eliminate arc light ground connection overvoltage, avoids the electrical equipment damage accident that arc light ground connection arouses, improves the power supply reliability.
The arc tube management intelligent line selection device adopts single-phase eddy current to drive rapid circuit breakers ARSa, ARSb and ARScc, the switching-off time is less than or equal to 5ms, the switching-on time is less than or equal to 20ms, the circuit breakers are grounded in series with a special resistor R, the rapid characteristic of the circuit breakers is utilized, high-energy resistors are rapidly and accurately put in and taken out, a fault line is accurately selected by utilizing the current of an instantaneously increased fault point, the accuracy of line selection reaches 100 percent, the single-phase eddy current is adopted to drive the circuit breakers Ka, Kb and Kc to be grounded, the switching-off time is less than or equal to 5ms, the switching-on time is less than or equal to 20ms, after the intelligent microcomputer controls the line selection device to accurately select the fault line, the intelligent microcomputer controls the line selection device to send a switching-on command to the single-phase eddy current to drive the circuit breakers Ka, Kb and Kc, the arc grounding is converted, after the abnormal operation of the device occurs, if the system has two different short circuits, the device can send a tripping command within 3ms, and the grounding fast breaker withdraws from the grounding phase within 10ms in total within 5ms of internal breaking, so as to prevent two-phase short circuit.
The arc tube management intelligent line selection device adopts an anti-saturation voltage transformer TV to replace a voltage transformer in a conventional PT cabinet, the transformer can effectively inhibit ferromagnetic resonance and reduce the damage of resonance to equipment, a primary resonance elimination device XX is arranged at a neutral point of the anti-saturation voltage transformer TV, the primary resonance elimination device XX can effectively inhibit the ferromagnetic resonance of the anti-saturation voltage transformer TV and reduce the damage of resonance to the equipment, a specially-made high-energy resistor R element is adopted, the resistor element has the advantages of small volume, convenient installation, large absorbed energy and the like, the arc tube management intelligent line selection device is matched with a single-phase eddy current driving quick circuit breaker ARSL to limit single-phase grounding current so that the grounding current is in a safety range and meets the requirement of line selection accuracy, the opening time of the circuit breaker is less than or equal to 5ms, the closing time is less than or equal to 20ms, and the circuit breaker serving as a backup protection to prevent the quick circuit breaker, the two-phase short circuit accident is caused by the burning out of the resistor.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. An arc tube management intelligent line selection device comprises a high-voltage isolating switch GN, a three-phase combined high-capacity overvoltage protector KYB, a PT high-voltage fuse RD, an anti-saturation voltage transformer TV, a primary harmonic elimination device XX, single-phase eddy current driving quick breakers Ka, Kb and Kc, a zero sequence current transformer 1LH, a special resistor R, a single-phase eddy current driving quick breaker ARSa, ARSb and ARSc, an intelligent microcomputer control line selection device ZK and a zero sequence current transformer 2LH, and is characterized in that: the upper end of the high-voltage isolating switch GN is electrically connected with a bus, the lower end of the high-voltage isolating switch GN is electrically connected with the upper end of a three-phase combined high-capacity overvoltage protector KYB, the lower end of the high-voltage isolating switch GN is electrically connected with the upper end of a PT high-voltage fuse RD, the lower end of the high-voltage isolating switch GN is electrically connected with an anti-saturation voltage transformer TV through the PT high-voltage fuse RD, one end of the anti-saturation voltage transformer TV is electrically connected with one end of a primary resonance elimination device XX, the lower end of the anti-saturation voltage transformer TV is electrically connected with one end of an intelligent microcomputer control line selection device ZK, the lower end of the high-voltage isolating switch GN is electrically connected with the upper ends of single-phase eddy current driving quick breakers Ka, Kb and Kc, the lower ends of the single-phase eddy current driving quick breakers Ka, Kb and Kc are electrically connected with, The upper ends of the ARSb and the ARSc are electrically connected, the lower end of the high-voltage isolating switch GN is electrically connected with the upper end of a special resistor R through a single-phase eddy current driving fast breaker ARSa, ARSb and ARSc, the lower end of the special resistor R is electrically connected with the upper end of a single-phase eddy current driving fast breaker ARSL, and the lower end of the single-phase eddy current driving fast breaker ARSL is electrically connected with the upper end of a zero sequence current transformer 2 LH.
2. The arc tube management intelligent wire selection device according to claim 1, wherein: the special resistor R is an element with the same effect as a capacitance element and an inductance element.
3. The arc tube management intelligent wire selection device according to claim 1, wherein: the low-voltage circuit breaker is characterized in that the lower end of the high-voltage isolating switch GN is grounded through a three-phase combined high-capacity overvoltage protector KYB, a neutral point of the anti-saturation voltage transformer TV is grounded through a primary harmonic elimination device XX, the lower end of the high-voltage isolating switch GN is grounded through single-phase eddy current driving quick breakers Ka, Kb and Kc, the switching-off time of the single-phase eddy current driving quick breakers Ka, Kb and Kc is less than or equal to 5ms, the switching-on time of the single-phase eddy current driving quick breakers ARSL is less than or equal to 20ms, the lower end of the high-voltage isolating switch GN is grounded through a single-phase eddy current driving quick breaker ARSL after being connected with a special resistor R in series, the switching-off time of the single-phase eddy current driving.
4. The arc tube management intelligent wire selection device according to claim 1, wherein: the lower ends of the single-phase eddy current driving rapid circuit breakers Ka, Kb and Kc and the single-phase eddy current driving rapid circuit breakers ARSa, ARSb and ARSc are electrically connected with the upper end of the intelligent microcomputer control line selection device ZK.
5. The arc tube management intelligent wire selection device according to claim 1, wherein: the single-phase eddy current driving fast circuit breakers Ka, Kb and Kc and the single-phase eddy current driving fast circuit breakers ARSa, ARSb and ARSc are electric elements with the same effects as a vacuum contactor, a switch and the like.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116466193A (en) * | 2023-06-19 | 2023-07-21 | 安徽帕维尔智能技术有限公司 | Multi-loop cable fault management and control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116466193A (en) * | 2023-06-19 | 2023-07-21 | 安徽帕维尔智能技术有限公司 | Multi-loop cable fault management and control device |
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