Low-voltage dual-power-supply control practical training device and method

Abstract

The invention discloses a low-voltage dual power supply control practical training device and method, two power supply simulation devices are respectively in secondary connection with a low-voltage spare power automatic switching simulation device, each power supply simulation device comprises a power supply control unit and a power supply simulation loop, and each power supply simulation loop comprises a self-coupling voltage stabilizing transformer. The self-coupling voltage stabilizing transformer is connected with a current loop and a transformation device, and a current adjusting device is arranged on the current loop; the low-voltage spare power automatic switching simulation device comprises a processor control unit, a voltage acquisition loop, a current acquisition unit, a control output loop, a control feedback loop and a fault feedback loop, and the voltage acquisition loop and the current acquisition unit are respectively connected with the voltage transformation device and the current regulation device; the three analog switches are connected with the low-voltage spare power automatic switching simulation device in a single-bus segmented mode and connected to a control output loop, a control feedback loop and a fault feedback loop, a low-voltage single-bus segmented dual-power-supply power supply scene in actual work can be truly simulated, and the low-voltage dual-power-supply spare power automatic switching control practical training function is achieved.

Description

Technical Field

[0001] The invention belongs to the field of low-voltage power distribution and relates to a low-voltage dual-power supply control training device and method. Background Art

[0002] In order to improve the reliability of power supply in the power system, reduce the power outage time caused by power failure, and ensure stable power supply to users, more and more low-voltage distribution stations adopt a single busbar segmented main wiring method with dual power supply. With the gradual increase of single busbar segmented power supply methods in 0.4kV distribution systems, low-voltage standby automatic switching devices are increasingly used in distribution systems. Low-voltage standby automatic switching devices are mainly used to automatically or manually switch the load to the backup power supply when the working power supply fails or the power is cut off, ensuring the continuity and reliability of power supply.

[0003] When using low-voltage standby automatic start-up devices, distribution operation and maintenance personnel lack practical training conditions for low-voltage standby automatic start-up device operation mode selection, loop closing and switching operations, and standby automatic start-up device parameter settings.

[0004] Low-voltage standby automatic transfer devices have been widely used in low-voltage power distribution systems, but there is currently no relevant training equipment on the market; existing training on low-voltage standby automatic transfer devices can only perform simple operations on low-voltage complete sets of equipment that are actually in use, and cannot simulate power failure problems such as overvoltage, undervoltage, voltage drop, and phase sequence error; cannot simulate actions such as circuit breaker tripping failure and circuit breaker refusal to operate; cannot simulate the alarm and load reduction actions of standby automatic transfer equipment in the case of load overload; and cannot demonstrate the impact of the standby automatic transfer device on different types of loads during its operation. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a low-voltage dual power supply control training device and method, which can truly simulate the low-voltage single-bus segmented dual power supply scenario in actual work and realize the low-voltage dual power supply standby automatic control training function.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A low-voltage dual power supply control training device, comprising a low-voltage standby automatic switching simulation device, three simulation switches and two power supply simulation devices; The two power supply simulation devices are used as working power supply and standby power supply respectively, and are connected to the low-voltage standby automatic switching simulation device. The power supply simulation device includes a power supply control unit and a power supply simulation circuit. The power supply simulation circuit includes an auto-coupling voltage-stabilizing transformer. The auto-coupling voltage-stabilizing transformer is connected to a current circuit and a transformer. A current regulating device is provided on the current circuit. The low-voltage standby automatic transfer simulation device includes a processor control unit, a voltage acquisition circuit, a current acquisition unit, a control output circuit, a control feedback circuit and a fault feedback circuit. The voltage acquisition circuit and the current acquisition unit are respectively connected to the transformer and the current regulating device. The three simulation switches are connected to the low-voltage standby automatic transfer simulation device in sections using a single busbar, and are connected to the control output circuit, the control feedback circuit and the fault feedback circuit.

[0007] Preferably, the analog switch is provided with electrical tripping simulation, control error simulation and signal error simulation circuits.

[0008] Preferably, a display unit is provided in the low-voltage standby automatic transfer simulation device.

[0009] Preferably, the analog switches on both sides are respectively connected to an analog load.

[0010] Preferably, the simulated load is a conventional load, an uninterruptible power supply load or a restart load, and the simulated switches on both sides are connected to the same simulated load.

[0011] A low-voltage dual power supply control training method includes the following processes: Set the low-voltage standby automatic transfer simulation device to the automatic transfer and self-recovery mode, simulate a power failure, and observe that the low-voltage standby automatic transfer simulation device automatically switches to the backup power supply. Remove the fault and observe that the low-voltage standby automatic transfer simulation device automatically restores the working power supply. Set the low-voltage standby automatic switching simulation device to the automatic switching manual recovery mode, simulate the failure of one power supply simulation device, observe the system automatically switching to the standby power supply, and manually restore to the working power supply; Set the low-voltage standby automatic switching simulation device to manual mode, manually simulate the power switching operation, and switch to the standby power supply or working power supply; Set the low-voltage standby automatic switching simulation device to the closing mode, confirm that the closing conditions are met, release the electrical interlock, and operate the three simulated switches to close at the same time to demonstrate the non-stop switching operation; Use the power supply simulation device to simulate overvoltage, undervoltage, loss of voltage and phase loss power supply faults, and observe the fault identification and control response of the low-voltage standby automatic transfer simulation device.

[0012] Preferably, observe the response and state changes of different loads in different modes; test the impact of the low-voltage standby automatic transfer simulation device on the three loads under various fault conditions respectively; test the intelligent load reduction function: control the current regulating device to the system preset load upper limit, activate the intelligent load reduction function, observe the automatic disconnection of low-priority loads by the low-voltage standby automatic transfer simulation device, ensure the stable power supply of the uninterruptible power supply load, and adjust the total load.

[0013] Preferably, an electrical tripping simulation is performed: a power supply simulation device is set, and the voltage and current are adjusted to a normal power supply state; the electrical tripping circuit is manually activated to simulate the tripping phenomenon of the circuit breaker due to overcurrent or short circuit; the response of the low-voltage standby automatic transfer simulation device to the tripping signal is checked, and the standby automatic transfer device is observed to enter the lockout mode; the feedback of the display unit is observed, and various types of information during the circuit breaker tripping and the standby automatic transfer lockout process are recorded; and the lockout release operation is manually simulated.

[0014] Preferably, a control error simulation is performed: under abnormal power supply conditions, such as simulating a low-voltage standby automatic transfer simulation device to send a signal to switch to the backup power supply when the main power supply loses voltage; observing whether the system has any unswitching operation; recording and analyzing the reasons for unsuccessful error control and solutions.

[0015] Preferably, a signal error simulation is performed: simulate the scenario in which the system collects incorrect switch position signals, such as erroneously displaying that the main power switch is disconnected, or erroneously displaying that the backup power switch is in the closed state; check the response of the backup automatic transfer device to the error signal, and observe whether the system incorrectly switches to the backup power supply or generates a false alarm; manually correct the signal error, re-collect the position signal, and observe whether the system automatically recovers to normal operation; record the impact of the signal error on the system, and analyze the conduction path of the error signal in the control logic of the backup automatic transfer device.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The low-voltage dual power supply control training device of the present invention can truly simulate the low-voltage single-bus segmented dual power supply scenario in actual work, so that trainees can learn and operate in a close to real environment. At the same time, the device can simulate common power supply, equipment, and load failures in low-voltage dual power supply scenarios, set various fault operating environments, and improve trainees' practical application ability and emergency response capabilities to complex situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the working principle of the low-voltage dual power supply control training device of the present invention; Figure 2 It is a schematic diagram of the principle of the power supply simulation circuit of the present invention; Figure 3 It is a schematic diagram of the principle of the power control unit of the present invention; Figure 4 It is a schematic diagram of the control output principle of the low-voltage standby automatic switching simulation device of the present invention; Figure 5 It is a schematic diagram of the analog switch control principle of the present invention. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" used in this article includes any and all combinations of one or more related listed items. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0021] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0022] like Figure 1 As shown, the low-voltage dual power supply control training device described in this embodiment is composed of a low-voltage standby automatic switching simulation device, a simulation switch, a power supply simulation device and a simulation load. It simulates the low-voltage single bus segmented operation mode of the distribution station room, and restores the actual operation scene through the low-voltage standby automatic switching simulation device and 3 simulation switches to realize low-voltage dual power supply control, station room switching, loop switching and other training functions.

[0023] The power simulation device is composed of a power control unit and a power simulation circuit. The power control unit is connected to and controls the power simulation circuit. Figure 2 As shown, the power simulation circuit uses an auto-coupling voltage-stabilizing transformer to stabilize the device power supply to AC 230V to ensure the stability of the simulated power supply control. The auto-coupling voltage-stabilizing transformer is connected to a current circuit and a transformer. Through different ratio transformers, overvoltage, undervoltage, loss of voltage and normal voltage power are simulated. The current circuit and transformer convert the single-phase power supply into a three-phase four-wire power supply to provide simulated power supply for the low-voltage standby automatic transfer simulation device. A current regulating device is provided on the current circuit, which has a current output regulating function. The simulated secondary current is output through the current regulating knob to provide a current simulation function for the low-voltage standby automatic transfer simulation device.

[0024] like Figure 3 As shown, the power control unit adopts the form of an integrated circuit, with a built-in power simulation circuit safety locking system. It realizes the simulation of power supply fault control such as overvoltage, undervoltage, loss of voltage and lack of phase and secondary current regulation through external button and knob control, and realizes the fault simulation of voltage and current collected by the low-voltage standby automatic simulation device.

[0025] There are two power supply simulation devices, which serve as the working power supply and the backup power supply respectively. The low-voltage backup automatic switching simulation device is secondarily connected to the two power supply simulation devices to ensure that the power system can automatically switch to the backup power supply when the working power supply fails. It belongs to the segmented power supply connection mode. In this mode, two independent power supply simulation devices supply power separately, and the low-voltage backup automatic switching simulation device is installed on the busbar segmented circuit breaker. When one of the power supply simulation device lines fails and is cut off, the segmented circuit breaker will automatically be put into operation, and the other power supply will supply all the loads. This method is usually used in busbar segmented power supply systems to ensure that when one power supply line fails, the other line can continue to supply power.

[0026] The low-voltage standby automatic transfer simulation device integrates the common functions of the existing dual power supply control in the distribution room and adds the functions of closing loop and intelligent load shedding. It includes a processor control unit, a voltage acquisition circuit, a current acquisition unit, a control output circuit, a control feedback circuit, a fault feedback circuit and a display unit; the processor control unit is used to collect and analyze voltage, current and fault signals and perform control operations. The voltage acquisition circuit and the current acquisition unit are connected to the transformer device and the current regulating device respectively. The voltage acquisition circuit and the current acquisition unit are used to collect the two power supply voltages and current signals of the power supply simulation device in real time as input data of the low-voltage standby automatic transfer simulation device. The control and feedback circuits are used to output control instructions and receive feedback to realize the functions of automatic transfer and automatic recovery, automatic transfer and manual recovery, manual, closing loop and intelligent load shedding. The display unit is used to display the power supply, current, switch position and fault information in real time for easy operation and monitoring.

[0027] The secondary connection of the low-voltage standby automatic switching simulation device includes the access of the voltage collection transformer (PT), the access of the current transformer (CT) and the access of the control circuit of the simulation switch.

[0028] The connection of the voltage collection transformer (PT) forms a voltage collection loop, which is used to detect the voltage status of the working power supply and the backup power supply. It is an important basis for the low-voltage standby automatic transfer simulation device to determine whether the power supply needs to be switched. The voltage input end of the low-voltage standby automatic transfer simulation device is usually connected to the secondary side of the voltage transformer of the working power supply and the backup power supply. In this way, the low-voltage standby automatic transfer simulation device can monitor the voltage conditions of the two power supply simulation devices in real time.

[0029] The connection of the current transformer (CT) forms a current collection loop, which is used to detect the current state of the power supply simulation device. The current input end of the low-voltage standby automatic transfer simulation device can be connected to the secondary side of the current transformer of the power supply simulation device. In this way, the low-voltage standby automatic transfer simulation device can simulate the intelligent load reduction function in the case of power overload by detecting the current state.

[0030] The output of the low voltage standby automatic switching simulation device is as follows Figure 4As shown, by collecting the voltage of the 2-way power supply simulation circuit, simulating the incoming line, contact current, simulation switch position information and fault information and displaying them through the display unit, the processor control unit judges and controls the output of the output circuit to realize functions such as automatic throwing and automatic recovery, automatic throwing and manual recovery, manual, closing loop and intelligent load reduction. In the automatic throwing and automatic recovery, automatic throwing and manual recovery and manual modes, there is an electrical interlock between the three simulation switches, and only two simulation switches are allowed to be closed. In the closing loop mode, after the processor control unit judges that the closing loop conditions are met, the electrical interlock between the three simulation switches is released, and the three simulation switches are allowed to be closed at the same time, so as to realize the non-power-off switching operation training.

[0031] like Figure 5 As shown, the simulation switch is used to simulate the low-voltage circuit breaker control unit. The three simulation switches and the low-voltage standby automatic transfer simulation device are connected in sections using a single busbar, and are connected to the control output circuit, the control feedback circuit and the fault feedback circuit. The simulation switch adds electrical tripping simulation, control error simulation and signal error simulation circuits, and cooperates with the low-voltage standby automatic transfer simulation device to realize the simulation functions of electrical tripping faults and circuit breaker operation abnormalities.

[0032] The working principle is: Normal working state: The power supply simulation device outputs stable power for the low-voltage standby automatic switching simulation device. The standby automatic switching simulation device collects and analyzes voltage and current information, and simulates different incoming lines, contact currents and other operations through analog switches.

[0033] Fault simulation: Through the power control unit, overvoltage, undervoltage, loss of voltage and other faults are manually set, and the low-voltage standby automatic simulation device monitors and judges the fault in real time and outputs the corresponding control signal. At the same time, the display unit can feedback the fault information in real time, which is convenient for operation and observation.

[0034] Automatic and manual mode switching: The low-voltage standby automatic switching simulation device supports automatic switching and automatic recovery, automatic switching and manual recovery, and manual modes. Depending on the mode, it automatically closes or manually controls. The electrical locking function prevents misoperation.

[0035] Loop-closing mode and intelligent load shedding: In loop-closing mode, the processor control unit determines to release the electrical interlock, allowing the three simulated switches to close at the same time, simulating a non-stop power-off scenario. When the intelligent load shedding function detects that the load exceeds the limit, it automatically determines and reduces non-important loads to ensure system stability.

[0036] In this embodiment, the analog switches on both sides are respectively connected to a simulated load, and the simulated loads include three types: conventional load, uninterruptible power supply load and restart load. The influence of the dual-power low-voltage standby automatic transfer simulation device on different types of loads in different operating modes can be demonstrated. The analog switches on both sides are connected to the same simulated load.

[0037] Conventional loads are used to simulate the power supply requirements of common equipment and can demonstrate the switching of power supply to it in normal, fault and switching operations.

[0038] Uninterruptible power supply load (UPS load) is used to simulate key equipment that requires continuous power supply, test the switching response of UPS load in different modes of low-voltage standby automatic switching simulation device, and ensure uninterrupted power supply to UPS load during switching process.

[0039] The restart load is used to simulate a device that needs to be restarted after a power outage. It shows how the system controls the restart of the load after the fault is restored or switched to the backup power source, reflecting the dependence of the restart load on the power supply mode.

[0040] In the automatic switching and self-recovery mode, the low-voltage standby automatic switching simulation device will automatically switch to the backup power supply and automatically restore to the original state. After the automatic recovery, the normal load and the restart load will enter the power supply and restart state respectively; the uninterruptible power supply load will not be interrupted during the switching process to ensure continuous operation.

[0041] In the automatic reset mode, the low voltage standby automatic reset simulation device automatically switches to the backup power supply, but manual operation is required to restore it. At this time, the normal load and the restart load need to be manually confirmed to restore the power supply, and the uninterruptible power supply load still guarantees uninterruptible power supply.

[0042] In manual mode, all switching operations require manual intervention. It is suitable for maintenance or specific scenarios. The power supply status depends on the operation. The restart load is restored after power failure and restart, and the normal load is powered according to the operation. The uninterruptible power supply load always maintains a stable power supply.

[0043] In the closed loop mode, the electrical interlock is released when the closed loop conditions are met, allowing the three analog switches to close at the same time, realizing the switching operation without power outage. The uninterruptible power supply load continues to operate stably, and the normal load and the restart load are stably supplied with power by real-time judgment of the power supply path.

[0044] Under intelligent load shedding, when the load exceeds the limit, the low-voltage standby automatic simulation device automatically disconnects some conventional loads and restarts the load according to the preset priority, ensuring continuous power supply to the uninterruptible power supply load and important loads.

[0045] The low-voltage dual power control training device of this embodiment is used to help trainees deeply understand the operating logic of the dual power backup automatic switching device under different working conditions. The following is a detailed training method and process: S1. Equipment inspection and preparation Check whether the various components of the training device are connected correctly, and ensure that the connections between the power supply simulation device, low-voltage standby automatic transfer simulation device, simulation switch and simulation load meet the training requirements.

[0046] Adjust the current adjustment knob of the power simulation device to set the initial current value to simulate the normal power state of the system.

[0047] S2. Basic operation and analog switch control Observe and become familiar with the operation of three simulated switches, including closing, opening, manual mode and electrical interlocking.

[0048] Manually control each analog switch, observe the effect of different analog switch states on the power supply of the analog load, and understand the electrical latching logic.

[0049] S3. Mode setting and operation Automatic transfer and automatic recovery mode: Set the low-voltage standby automatic transfer simulation device to automatic transfer and automatic recovery mode. Simulate a power failure and observe that the low-voltage standby automatic transfer simulation device automatically switches to the backup power supply to ensure continuous power supply to the load. Resolve the fault and observe that the low-voltage standby automatic transfer simulation device automatically restores the working power supply, and record the power supply status of the normal load, UPS load, and restart load.

[0050] Automatic reset mode: Set the low voltage backup automatic reset simulation device to the automatic reset mode. Simulate a power failure and observe the system automatically switching to the backup power supply. Manually restore to the working power supply and observe the status changes of the conventional load, UPS load or restart load during the manual recovery process.

[0051] Manual mode: Set the low voltage standby automatic switching simulation device to manual mode. Manually simulate the power switching operation, switch to the standby power supply or working power supply, and observe the response of different loads.

[0052] Loop closing mode: Set the low-voltage standby automatic switching simulation device to loop closing mode. Confirm that the loop closing conditions are met, release the electrical interlock, and operate the three simulated switches to close at the same time to demonstrate the non-stop switching operation. Observe the state changes of each load under the loop closing operation, especially the power supply stability of the UPS load.

[0053] S4. Fault simulation and response Use the power supply simulation device to simulate power supply faults such as overvoltage, undervoltage, voltage loss, and phase loss, and observe the fault identification and control response of the low-voltage standby automatic transfer simulation device. Test the impact of the low-voltage standby automatic transfer simulation device on the three loads under various fault conditions, and record the system switching and recovery process.

[0054] By simulating the electrical tripping simulation and signal error simulation circuit of the simulating switch, the simulation function of electrical tripping failure and abnormal operation of the circuit breaker is realized.

[0055] Electrical tripping simulation: Electrical tripping fault simulation is used to reproduce the automatic disconnection state of the circuit breaker in the event of an electrical fault, allowing students to understand the triggering conditions and system response of the circuit breaker tripping. The simulation steps are as follows: 1. Set up the power simulation device and adjust the voltage and current to normal power supply status.

[0056] 2. Manually activate the electrical trip circuit to simulate the circuit breaker tripping due to overcurrent or short circuit.

[0057] 3. Check the response of the low-voltage standby automatic transfer simulation device to the trip signal and observe whether the standby automatic transfer device enters the lockout mode.

[0058] 4. Observe the feedback from the display unit, record various information during the circuit breaker tripping and standby automatic lockout process; manually simulate the lockout release operation.

[0059] Control error simulation: Control error simulation is to examine the system's response when a control signal error occurs (such as misoperation, command conflict, etc.), so that students can master how to identify and deal with the risks brought by control errors. The simulation steps are as follows: 1. Under abnormal power supply conditions, such as the simulated low-voltage standby automatic switching simulation device, when the main power supply loses voltage, it sends a signal to switch to the backup power supply.

[0060] 2. Observe whether the system has any non-switching operation; 3. Record and analyze reasons for unsuccessful error control and solutions.

[0061] Signal error simulation: Signal error simulation is used to reproduce the abnormal power supply situation caused by the error of the collected position signal or status information, and help students master the method of detecting and correcting signal errors. The simulation steps are as follows: 1. Simulate the scenario where the system collects the wrong switch position signal, such as incorrectly showing that the main power switch is disconnected, or incorrectly showing that the backup power switch is in the closed state.

[0062] 2. Check the response of the backup automatic transfer device to the error signal and observe whether the system incorrectly switches to the backup power supply or generates a false alarm.

[0063] 3. Correct the signal error manually, re-collect the position signal, and observe whether the system automatically recovers to normal operation.

[0064] 4. Record the impact of signal errors on the system and analyze the conduction path of the error signal in the control logic of the backup automatic transfer device.

[0065] S5. Intelligent load shedding function test Control the current regulating device to the preset upper load limit of the system and activate the intelligent load reduction function. Observe the automatic disconnection of low-priority loads (such as regular loads and partial restart loads) by the low-voltage standby automatic switching simulation device to ensure the stable power supply of the uninterruptible power supply load.

[0066] S6. Data recording and analysis In each training step, record the operating data of various loads in different modes and fault conditions, including voltage, current, switch status and power supply status of the load. By analyzing the data, summarize the response law and control logic of the dual power backup automatic transfer device in different operating modes and fault conditions.

[0067] After the practical training of this process, trainees can master the following contents: the basic structure and operation principle of low-voltage dual power backup automatic transfer device. Switching operation and load response under various control modes. Automatic control logic and fault handling process of backup automatic transfer device under power failure. Triggering conditions and priority control strategy of intelligent load reduction function.

[0068] This practical training process helps trainees understand the functions and maintenance methods of the low-voltage dual power supply control system in actual distribution stations during operation, and improves their skills in dealing with various working conditions in actual power systems.

[0069] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0070] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0071] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0072] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0073] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

[0074] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A low voltage dual power supply control training device, characterized in that: It includes a low voltage standby automatic switching simulation device, three simulation switches and two power supply simulation devices; The two power supply simulation devices are used as working power supply and standby power supply respectively, and are connected to the low-voltage standby automatic switching simulation device. The power supply simulation device includes a power supply control unit and a power supply simulation circuit. The power supply simulation circuit includes an auto-coupling voltage-stabilizing transformer. The auto-coupling voltage-stabilizing transformer is connected to a current circuit and a transformer. A current regulating device is provided on the current circuit. The low-voltage standby automatic transfer simulation device includes a processor control unit, a voltage acquisition circuit, a current acquisition unit, a control output circuit, a control feedback circuit and a fault feedback circuit. The voltage acquisition circuit and the current acquisition unit are respectively connected to the transformer and the current regulating device. The three simulation switches are connected to the low-voltage standby automatic transfer simulation device in sections using a single busbar, and are connected to the control output circuit, the control feedback circuit and the fault feedback circuit.

2. The low-voltage dual power supply control training device according to claim 1 is characterized in that: The simulation switch is provided with electrical tripping simulation, control error simulation and signal error simulation circuits.

3. The low-voltage dual power supply control training device according to claim 1 is characterized in that: A display unit is provided in the low-voltage standby automatic transfer simulation device.

4. The low-voltage dual power supply control training device according to claim 1 is characterized in that: The analog switches on both sides are respectively connected to an analog load.

5. The low-voltage dual power supply control training device according to claim 1 is characterized in that: The simulated load adopts a normal load, an uninterruptible power supply load or a restart load, and the simulated switches on both sides are connected to the same simulated load.

6. A low-voltage dual power supply control training method based on the device according to any one of claims 1 to 5, characterized in that: The process includes: Set the low-voltage standby automatic transfer simulation device to the automatic transfer and self-recovery mode, simulate a power failure, and observe that the low-voltage standby automatic transfer simulation device automatically switches to the backup power supply. Remove the fault and observe that the low-voltage standby automatic transfer simulation device automatically restores the working power supply. Set the low-voltage standby automatic switching simulation device to the automatic switching manual recovery mode, simulate the failure of one power supply simulation device, observe the system automatically switching to the standby power supply, and manually restore to the working power supply; Set the low-voltage standby automatic switching simulation device to manual mode, manually simulate the power switching operation, and switch to the standby power supply or working power supply; Set the low-voltage standby automatic switching simulation device to the closing mode, confirm that the closing conditions are met, release the electrical interlock, and operate the three simulated switches to close at the same time to demonstrate the non-stop switching operation; Use the power supply simulation device to simulate overvoltage, undervoltage, loss of voltage and phase loss power supply faults, and observe the fault identification and control response of the low-voltage standby automatic transfer simulation device.

7. The low-voltage dual power supply control training method according to claim 6 is characterized in that: Observe the response and status changes of different loads in different modes; test the impact of the low-voltage standby automatic transfer simulation device on the three loads under various fault conditions; intelligent load reduction function test: control the current regulating device to the system preset load upper limit to the system preset load upper limit, activate the intelligent load reduction function, observe the automatic disconnection of low-priority loads by the low-voltage standby automatic transfer simulation device, ensure the stable power supply of the uninterruptible power supply load, and adjust the total load.

8. The low voltage dual power supply control training method according to claim 6 is characterized in that: Perform electrical tripping simulation: set up the power supply simulation device, adjust the voltage and current to the normal power supply state; manually activate the electrical tripping circuit to simulate the tripping phenomenon of the circuit breaker due to overcurrent or short circuit; check the response of the low-voltage standby automatic transfer simulation device to the tripping signal, and observe the standby automatic transfer device entering the lockout mode; observe the feedback from the display unit, and record various types of information during the circuit breaker tripping and standby automatic transfer lockout process; manually simulate the lockout release operation.

9. The low-voltage dual power supply control training method according to claim 6 is characterized in that: Conduct control error simulation: Under abnormal power supply conditions, such as simulating the low-voltage standby automatic transfer simulation device to send a signal to switch to the backup power supply when the main power supply loses voltage; observe whether the system has any unswitched operations; record and analyze the reasons for the failure of error control and the solution.

10. The low voltage dual power supply control training method according to claim 6, characterized in that: Perform signal error simulation: simulate the scenario where the system collects switch position signal errors, such as erroneously showing that the main power switch is disconnected, or erroneously showing that the backup power switch is in the closed state; check the response of the backup automatic transfer device to the error signal, and observe whether the system incorrectly switches to the backup power supply or generates a false alarm; manually correct the signal error, re-collect the position signal, and observe whether the system automatically recovers to normal operation; record the impact of the signal error on the system, and analyze the conduction path of the error signal in the control logic of the backup automatic transfer device.

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