Low-voltage spare power automatic switching simulation test device and method

Abstract

The invention discloses a low-voltage spare power automatic switching simulation test device and method, and belongs to the technical field of power equipment testing. The device comprises a main switch simulation module, a signal interaction module and an operation panel module. The main switch simulation module adopts a contactor and a self-locking circuit to simulate the opening and closing states and electrical characteristics of a low-voltage incoming line and a bus tie switch; the signal interaction module receives a control signal of the spare power automatic switching device, drives the analog switch to act, and feeds back a switch state signal to the spare power automatic switching device to form a closed-loop test; the operation panel module provides a local manual operation interface. During testing, the spare power automatic switching device is connected to a secondary line of a real switch and is switched to the device, and the logic function of the spare power automatic switching device and the correctness of secondary wiring can be comprehensively verified under the condition that primary power supply of a power distribution room is not interrupted by setting an initial state and simulating fault triggering. According to the invention, the problem that power-off debugging must be carried out in a traditional mode is solved, and the working efficiency and the power supply reliability are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power equipment testing, and particularly relates to a low-voltage backup automatic switching simulation testing device and method. BACKGROUND

[0002] In order to guarantee the safety and reliability of power supply to users and improve the automatic switching capability of double power distribution rooms at the low-voltage side, a low-voltage backup automatic switching device is usually installed in a power distribution room without related devices, and the original device running for more than a certain period of time or having a fault is replaced.

[0003] In the existing working mode, after the installation or replacement of the new device is completed, in order to ensure that the user side does not have frequent voltage fluctuations caused by debugging, the traditional method needs to implement power failure of the entire power distribution room in order to carry out subsequent transmission debugging and function verification. This conventional process mainly includes the following steps: first, all transformers and low-voltage main switches in the power distribution room are powered off; second, the original low-voltage backup automatic switching device and its related secondary wiring are disassembled; third, the new device is installed and the secondary wiring is laid; fourth, on-site debugging is carried out under the condition of power failure and problems found in the debugging are processed; and finally, the device can be formally put into operation.

[0004] However, the above-mentioned traditional working mode has several inherent defects: first, all debugging work needs to be completed on the engineering site, and the work efficiency is low; second, the transmission test must be carried out under the condition of overall power failure of the primary switch cabinet, resulting in a long power failure time; third, the function and performance of the low-voltage backup automatic switching device itself cannot be verified in advance before the secondary wiring is completed; fourth, if the device function is found to be abnormal after the wiring is completed, it is difficult to replace and process it in a short time; and fifth, the efficiency of on-site transmission acceptance work is easily affected by various external environmental factors.

[0005] Therefore, it is urgent to seek a new technical means to solve these problems in the existing working mode. SUMMARY

[0006] The present application aims to provide a low-voltage backup automatic switching simulation testing device and method to at least solve one of the problems in the prior art.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: In a first aspect, the present application provides a low-voltage backup automatic switching simulation testing device, comprising: A main switch simulation module, comprising at least three simulated switch units, for simulating the physical action and state of the main switch of the low-voltage incoming line cabinet and the bus tie cabinet; The signal interaction module is electrically connected with the main switch simulation module, and is provided with a control signal input terminal and a state signal output terminal. The operation panel module is electrically connected with the main switch simulation module, and is used for providing a local manual operation interface to manually control the opening and closing states of the simulation switch units.

[0008] Further, each simulation switch unit comprises: A contactor, whose main contact is used for simulating the opening and closing states of the low-voltage main switch; A self-locking circuit, which is formed by connecting the closing button in parallel with the normally open auxiliary contact of the contactor, and is used for maintaining the attraction state of the contactor after being triggered; An opening button, which is connected in series in the loop of the self-locking circuit, and is used for cutting off the self-locking loop after being triggered.

[0009] Further, each simulation switch unit further comprises: A closing indicator lamp and an opening indicator lamp, which are respectively connected to the normally open auxiliary contact and the normally closed auxiliary contact of the contactor, and are used for directly displaying the current state of the simulation switch unit.

[0010] Further, the signal interaction module comprises a remote closing relay and a remote opening relay corresponding to each simulation switch unit. The coil of the remote closing relay constitutes the closing signal input terminal of the control signal input terminal, and the normally open contact thereof is connected in parallel with the closing button; The coil of the remote opening relay constitutes the opening signal input terminal of the control signal input terminal, and the normally closed contact thereof is connected in series with the opening button.

[0011] Further, the state signal output terminal comprises a closing signal terminal led out by the normally open auxiliary contact of the contactor and an opening signal terminal led out by the normally closed auxiliary contact.

[0012] Further, the device is of a portable structure, and all the modules are integrated in a box body, and the wiring terminals of the operation panel module and the signal interaction module are arranged on the box body panel.

[0013] In the second aspect, the application provides a method for testing by using the low-voltage backup power automatic switching simulation testing device, which comprises the following steps: The wiring step: connecting the low-voltage backup power automatic switching device in the to-be-tested power distribution room to the secondary control line and the state signal line of the low-voltage main switch body, and then connecting the secondary control line and the state signal line to the corresponding control signal input terminal and state signal output terminal of the testing simulation device; The simulation testing step: The initial state of each analog switch unit is manually set through the operation panel module; An analog switch unit is tripped by simulating power grid faults or manually triggering; The measured backup automatic switching device sends a control signal to the test simulation device according to the received state signal change according to the preset logic; The final action state of each analog switch unit on the test simulation device is observed and compared with the expected logic of the measured backup automatic switching device to verify its function and wiring correctness.

[0014] Further, in the simulation test step, the preset logic includes at least one of the functions of automatic switching, manual switching, and loop closing.

[0015] Further, in the wiring step, the closing control output end, the tripping control output end, the closing signal input end, and the tripping signal input end of the measured backup automatic switching device are connected to the terminals with the same number on the test simulation device.

[0016] Further, the entire test process is completed without power interruption in the primary power supply circuit of the distribution room.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows: The device is connected to the measured backup automatic switching device through its signal interaction module, and a test environment completely isolated from the primary high-voltage system of the distribution room is constructed. During the test process, the real primary switch does not need to be actuated, thereby completely avoiding user power interruption caused by debugging, eliminating the impact of frequent flickering on user equipment, and greatly improving power supply reliability and user satisfaction.

[0018] Using the device, the staff can fully verify the function of the backup automatic switching device and the correctness of its secondary wiring in the warehouse or laboratory before installation, or on site without power interruption in the distribution room. This changes the traditional mode of "finding and processing problems after power interruption" to "verifying in advance and only performing final connection during power interruption", which shortens the on-site transmission acceptance time from several hours to tens of minutes, and greatly improves work efficiency.

[0019] The device can comprehensively and accurately simulate various states and fault scenarios of the low-voltage main switch. Through simulation testing, it can identify the functional defects, logic errors, and secondary wiring errors of the backup automatic switching device itself, such as misconnection, omission, and virtual connection, before connecting to the real power grid, effectively avoiding risks and uncontrollable factors that may be encountered during on-site debugging, ensuring personnel and equipment safety, and reducing engineering rework costs and project delay risks.

[0020] The device can simulate test conditions in various working modes such as "self-throwing and self-recovery", "self-throwing and manual recovery", "manual" and "looping", etc. By manually setting initial state and triggering faults through the operation panel module, all preset logics of the backup power automatic switching device can be closed-loop tested to verify the accuracy and reliability of the action logic and ensure that the device can correctly act after being put into operation.

[0021] The core of the device uses contactors, relays and their auxiliary contacts to build analog switch units, and the electrical characteristics (such as driving of opening and closing coils and feedback of auxiliary contacts) are highly consistent with those of real low-voltage circuit breakers. This Hardware-in-the-Loop simulation method can more truly reflect the actual working state of the backup power automatic switching device and switch cooperation than pure software simulation, and the test results are accurate and reliable, and highly consistent with the actual operation.

[0022] All modules of the device are integrated in a portable box, the panel layout is clear, and the wiring terminal identification is clear. This design makes the device flexible and easy to operate, and is very suitable for on-site use in different distribution rooms, greatly enhancing the practicality and convenience of the tool. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, serve to explain the application. The present application is shown in the drawings as follows: Figure 1 A basic principle diagram of the low-voltage backup power automatic switching simulation test device according to the embodiment of the present application; Figure 2 A front panel structure diagram of the low-voltage backup power automatic switching simulation test device according to the embodiment of the present application; Figure 3 A low-voltage wiring diagram of the distribution room in the embodiment of the present application; Figure 4 A low-voltage backup power automatic switching device wiring diagram in the embodiment of the present application. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0025] The following detailed description is exemplary and is intended to provide further detailed description of the present application. Unless otherwise specified, all technical terms used in the present application have the same meaning as understood by those skilled in the art. The terms used in the present application are only for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0026] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. It should be noted in the description of this invention that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Example 1 To address the aforementioned issues, a low-voltage automatic transfer switch (ATS) device and its wiring testing equipment were developed. This device verifies the correctness of the ATS logic before its formal commissioning and the correctness of the wiring after modification, ensuring the normal operation of the replaced ATS equipment, effectively shortening on-site power outage time, and improving the efficiency of engineering renovation. The core purpose of the device is to conduct comprehensive functional verification and logic testing of newly built, replaced, or overhauled low-voltage ATS devices and their secondary wiring in an on-site or laboratory environment without power outages in the distribution room. By simulating the electrical behavior and status signals of the low-voltage incoming main switches QF1 and QF2 and the bus tie main switch QF3, this device can form a complete and isolated testing system with the ATS under test, thereby identifying and eliminating defects in the device itself and wiring errors in advance, greatly shortening on-site power outage debugging time, and improving power supply reliability and work efficiency.

[0029] It should be noted that the low-voltage standby automatic transfer simulation test device in this solution is essentially a programmable logic simulator based on relays and contactors. Its hardware circuit mainly consists of the following three core modules: 1. The main switch action simulation module is the core execution unit.

[0030] The main switch operation simulation module is used to physically simulate the bodies of three low-voltage circuit breakers QF1, QF2, and QF3, receive and execute opening / closing commands, and provide auxiliary contact signals that are completely consistent with the actual switches.

[0031] The main switch operation simulation module includes: Three identical AC contactors, KM1, KM2, and KM3, and their matching auxiliary contacts, which can be configured as normally open or normally closed as needed. The on / off states of the contactor's main contacts simulate the opening and closing of the circuit breaker's main contacts, and the energization and de-energization of its coils simulate the circuit breaker's operating mechanism.

[0032] The self-locking circuit consists of a self-locking loop formed by a closing button (SB11 / SB21 / SB51) and a normally open auxiliary contact of the contactor connected in parallel. This loop ensures that the contactor remains engaged after a simulated manual or remote closing signal is triggered, until a tripping signal is received.

[0033] The indicator circuit uses LED indicators (HL10 / HL20 / HL50 - closing indicator, HL11 / HL21 / HL51 - opening indicator) connected in series with the corresponding auxiliary contacts of the contactor to visually display the real-time status of each analog switch.

[0034] 2. Signal input / output interaction panel, serving as a signal interface and relay unit.

[0035] The signal input / output interaction panel serves as a standardized interface panel between the test device and the low-voltage automatic transfer switch under test. It is responsible for receiving control signals from the automatic transfer switch and feeding back switch status signals to it.

[0036] The circuit configuration of the signal input / output interaction panel includes: The input channel (control signal reception) consists of three groups of six remote control relays (KA10, KA11, KA20, KA21, KA30, KA31).

[0037] The remote-controlled closing relays (KA11, KA21, KA31) have coil terminals 101-102 connected to the panel wiring terminals. When the automatic transfer switch issues a closing command (energizing terminals 101-102), the relay activates, its normally open contacts close, equivalent to pressing a manual closing button, triggering the corresponding contactor to close.

[0038] Remote control tripping relays (KA10, KA20, KA30): The coil terminals 103-104 of the remote control tripping relay are led to the panel wiring terminals. When the automatic transfer switch issues a tripping command (energizing terminals 103-104), the relay operates, its normally closed contact opens, which is equivalent to pressing a manual tripping button, cutting off the self-locking circuit and causing the corresponding contactor to trip.

[0039] The output channel (status signal feedback) is used to directly lead the auxiliary contacts (normally open contacts 113-114, normally closed contacts 111-112) of the three contactors (KM1, KM2, KM3) to the panel terminals. The status of these contacts changes synchronously with the main contacts, and is used to provide key remote signaling signals such as "switch closed" and "switch open" to the automatic transfer switch.

[0040] 3. The operation simulation panel serves as the human-computer interaction and local control unit.

[0041] The operation simulation panel provides a local manual operation interface, simulating the local operation buttons on the low-voltage switchgear, for device self-testing, manual mode testing, or simulating on-site switch operation.

[0042] The circuit configuration for operating the analog panel includes: The manual operation buttons include three groups of six illuminated mechanical buttons (SB10 / SB11, SB20 / SB21, SB50 / SB51), corresponding to the "open" and "close" positions of the three analog switches, respectively. The buttons are directly connected to their respective control circuits, have higher priority than remote signals, and can force the switch status to be operated.

[0043] The status indicator lights, including the indicator circuit shared with the main switch analog module, are integrated on the panel.

[0044] The main power supply of the device, including the power switch, fuse and power indicator, provides working power (AC 220V) for the control circuits (contaminants, relay coils, indicator lights) within the entire test device.

[0045] 4. System Integration and Structure All electrical components are housed in a portable carrying case. The front panel integrates all operating buttons, status indicators, and the main power switch. Terminal blocks are neatly arranged below the panel or in easily accessible locations inside the case, with all input / output signal lines (101, 102, ... 314) routed to these terminal blocks and clearly labeled with wire numbers for easy and quick wiring.

[0046] Example 2 As can be seen from Example 1, the working principle of this device is based on the concept of hardware-in-the-loop simulation. It simulates the electrical characteristics of a real switch through circuitry and forms a closed-loop test system with the standby automatic transfer device under test.

[0047] Below, based on the apparatus of Embodiment 1, an optional embodiment of a testing method is provided, including the following steps: 1. Transfer all secondary control lines and status signal lines (i.e., outputs of the automatic transfer switch: 101, 103, 113, 114, etc.) originally connected to the actual low-voltage circuit breakers (QF1, QF2, QF3) in the distribution room to the corresponding terminals on the terminal block of this test device. Simultaneously, correctly connect the common terminal (e.g., the neutral line) required by the automatic transfer switch. At this point, all control outputs and status inputs of the automatic transfer switch under test are no longer connected to the actual switches, but interact with this test device.

[0048] 2. Taking the testing of the "self-reply" function as an example, the workflow is explained as follows: The initial state simulation includes: manually setting via the operation panel to simulate incoming line 1 with QF1 (KM1) in the closed state (HL10 lit), simulating incoming line 2 with QF2 (KM2) in the closed state (HL20 lit), and simulating bus tie with QF3 (KM3) in the open state (HL51 lit). This state simulates the standard operating state with two power supplies operating separately and the bus tie disconnected.

[0049] Simulated fault triggering includes: manually pressing the trip button (SB10) of QF1 to simulate power failure of incoming line 1 or tripping of QF1 switch due to fault. KM1 contactor trips due to power failure, its normally open auxiliary contact (113-114) opens, and its normally closed auxiliary contact (111-112) closes.

[0050] Status signal feedback includes: status changes of the KM1 auxiliary contact, which are transmitted in real time to the tested automatic transfer switch via terminals (113-114, 111-112). The automatic transfer switch detects the "QF1 vacancy" signal.

[0051] The automatic transfer switch logic judgment and output include: Based on preset logic (e.g., "Incoming line 1 loses power"), the automatic transfer switch, after a set delay, sequentially issues two control commands: Issuing a tripping command includes: outputting a signal to the control terminals (203-204) of QF2 to activate the tripping relay KA20 in the test device, causing the KM2 contactor to trip (simulating the disconnection of the incoming power switch to prevent loop closing).

[0052] Issuing a closing command includes: outputting a signal to the control terminals (301-302) of QF3 to activate the closing relay KA31 in the test device, causing the KM3 contactor to close (simulating the connection of the bus tie switch, with the entire load carried by incoming line 2).

[0053] The execution and result verification of the actions include: the test device correctly executed the commands "Open QF2" and "Close QF3", and the corresponding indicator lights (HL21, HL50) changed state. The operator observes whether the indicator lights of the three switches on the test device ultimately show: QF1 open, QF2 open, QF3 closed. This state is consistent with the expected result of the "automatic transfer and automatic reset" logic. At the same time, the indications or messages of the standby automatic transfer device itself can be observed to confirm that its logic is executed correctly. Thus, a complete standby transfer logic test is completed without operating any actual primary switches. The test procedures for other functions such as "automatic transfer and manual reset", "manual", and "loop closing" are similar, and different initial states and trigger conditions can be set through the operation panel.

[0054] It should be noted that the key to the working principle of this device lies in "signal-level simulation and closed-loop control". The device receives the control signal (input) of the automatic transfer switch, drives the analog switch to operate, and immediately feeds back the new status signal (output) generated by the analog switch to the automatic transfer switch. The automatic transfer switch determines its next action based on the feedback signal, thus forming a complete logical test closed loop that is completely consistent with the field operation. All of this is carried out in a safe environment completely isolated from the high-voltage primary system, achieving "uninterrupted power supply commissioning".

[0055] This low-voltage automatic transfer switch (ATS) simulation test device solution successfully constructs a safe, reliable, and efficient test platform through three main circuit components: a main switch action simulation module, a signal input / output interaction panel, and an operation simulation panel. Its working principle is clear; through hardware circuitry, it accurately simulates the electrical behavior of field switches, achieving seamless integration and functional verification with various low-voltage ATS devices. The widespread application of this device will fundamentally change traditional working methods, significantly improve work efficiency, shorten power outage time, and is an important technical tool for ensuring the reliability of power distribution networks.

[0056] Example 3 In one optional embodiment, the device of Embodiment 3 of the present invention mainly consists of three parts: a signal input / output interaction panel, a main switch operation simulation module for low-voltage incoming cabinet and bus tie cabinet, and an operation simulation panel.

[0057] (1) The signal input / output interaction panel includes control signal input and switch logic status signal output.

[0058] The signal input / output interactive panel simulates the control and position signal input / output between the low-voltage standby automatic transfer device and the low-voltage main switch, and uses relays to simulate the open and closed positions of the main switches in the low-voltage incoming cabinet and bus tie cabinet. (2) Simulation module for main switch operation of low-voltage incoming line cabinet and bus tie cabinet The main switch operation simulation module for low-voltage incoming line cabinets and bus tie cabinets uses contactors and auxiliary contacts to simulate the switching state of the low-voltage main switch and the remote signaling signals required by the low-voltage automatic transfer switch. A self-locking circuit simulates the switch closing state.

[0059] (3) Operation simulation panel The operation simulation panel simulates the electric operating mechanism of the low-voltage main switch in the low-voltage incoming line cabinet and bus tie cabinet, the detection of the low-voltage automatic transfer device in the "manual" position, or the manual operation of the incoming line when the low-voltage standby automatic transfer device is not connected.

[0060] In one optional embodiment, the low-voltage automatic transfer switch (ATS) simulation test device is temporarily configured according to the quantity and standard of three low-voltage main switches, which is compatible with low-voltage ATS equipment from common manufacturers. The ATS simulation test device can identify the relevant characteristics of the low-voltage main switches in the low-voltage switchgear and make physical wiring connections with the ATS equipment under test. According to the four working states of the current low-voltage ATS device, namely "automatic transfer and automatic reset", "automatic transfer and manual reset", "manual", and "loop closing", it can accurately test and verify the switching quantity change and automatic transfer functions of the low-voltage main switch.

[0061] The basic principle of the low-voltage standby automatic transfer simulation test device is as follows: Figure 1 As shown: QF1, QF3, and QF2 are located on the left, middle, and right respectively.

[0062] KM1: Contactor, simulating a power switch, i.e., QF1 (or 401) switch. KM1 has many normally open or normally closed auxiliary contacts for self-locking and opening / closing indication, etc. The state of the auxiliary contacts changes simultaneously with that of the main contacts.

[0063] SB11: Closing button. This closing button is normally open. When the SB11 button is pressed, the closing button contact closes, forming a circuit. The KM1 main contact closes, and the KM1 auxiliary contact is connected in parallel with SB11. This KM1 auxiliary contact changes from open to closed, forming a self-locking mechanism. Thus, when the SB11 button is released and pops up, the KM1 main contact remains closed.

[0064] HL10: Closing indicator light. This indicator light is connected in series with the KM1 auxiliary contact. When the KM1 main contact is closed, the auxiliary contact is also closed, and the closing indicator light illuminates.

[0065] HL11: Trip indicator light. This indicator light is connected in series with the KM1 auxiliary contact. When the KM1 main contact is open, the auxiliary contact is also open, and the trip indicator light illuminates.

[0066] SB10: Trip button. This trip button is normally closed. When the SB10 button is pressed, the trip button contacts open, cutting off the self-locking circuit formed when the KM1 main contacts are closed. KM1 is de-energized, and the main contacts open.

[0067] KA11: Relay, used for remote closing, equivalent to the closing coil. The normally open auxiliary contact of this relay is connected in parallel with the SB11 button. When the relay is energized, that is, when 101 and 102 are energized, the auxiliary contact closes, which is equivalent to pressing the SB11 button, thus achieving the purpose of closing the KM1 main contact.

[0068] KA10: Relay, used for remote tripping, equivalent to the tripping coil. The normally open auxiliary contact of this relay is connected in series with the SB10 button. When the relay is energized, that is, when 103 and 104 are powered on, the auxiliary contact is opened, which is equivalent to pressing the SB10 button, thus achieving the purpose of opening the KM1 main contact.

[0069] The leads of KA11 relays 101 and 102 are connected to the terminals of this test device for remote control closing. Connect the leads of KA10 relays 103 and 104 to the terminals of this test device for remote tripping.

[0070] The KM1 contactor has two sets of auxiliary contacts: one normally open set (113, 114) and one normally closed set (111, 112). These are connected to the terminals of this test device and are used by the low-voltage automatic transfer switch to determine the closed or open state of the contactor.

[0071] like Figure 2 As shown, the device's panel is made of 2mm thick iron plate. Holes are drilled for the corresponding panel buttons, power supply, and input / output lines, and corresponding function buttons are installed. Relays and contactors are installed inside the carrying case. The relays and contactors are wired and connected according to the schematic diagram, and the device panel is installed inside the carrying case. The buttons are connected to terminal blocks. Each terminal block is connected to 101, 102, 103, 104, 111, 112, 113, 114; 201, 202, 203, 204, 211, 212, 213, 214; 301, 302, 303, 304, 311, 312, 313, 314 for transmitting opening and closing signals, etc.

[0072] SB10 is the 401 (QF1) trip button, SB11 is the 401 (QF1) close button, HL10 is the 401 (QF1) close indicator light, and HL11 is the 401 (QF1) trip indicator light.

[0073] SB20 is the 402 (QF2) trip button, SB21 is the 402 (QF2) close button, HL20 is the 402 (QF2) close indicator light, and HL21 is the 402 (QF2) trip indicator light.

[0074] SB50 is the 445 (QF3) trip button, SB51 is the 445 (QF3) close button, HL50 is the 445 (QF3) close indicator light, and HL51 is the 445 (QF3) trip indicator light.

[0075] The main power supply for the device is located in the lower left corner of the front panel. When the device power is switched on, the three switch open / close indicator lights will illuminate; the default initial state is open. The remaining portion of the front panel contains the three main switch open / close indicator lights and the open / close buttons. When the close button is pressed, the corresponding switch's close indicator light will illuminate. The low-voltage automatic transfer switch simulation test device is connected to the low-voltage automatic transfer switch via a control line.

[0076] In one embodiment, this device is used to test the low-voltage automatic transfer switch and its wiring. The usage method is as follows: 1) Introduction to Use Cases Low-voltage automatic transfer switches are mainly used in power distribution rooms and other dual-power automatic transfer applications. For low-voltage wiring in power distribution rooms, see [link to relevant documentation]. Figure 3 Lead the voltage and current lines from the low-voltage distribution room to the low-voltage automatic transfer switch. See the attached diagram for specific wiring instructions. Figure 4 .

[0077] Figure 4 This shows the typical terminal wiring for an existing low-voltage automatic transfer switch. The area inside the box represents the terminals of the low-voltage automatic transfer switch, and the area outside the box represents the wiring.

[0078] The normal wiring is for the low-voltage automatic transfer switch (ATS), with terminals connected to the terminal block, cabinet door, and switch body via control cables. When the ATS is replaced and rewired, to verify the correctness of the ATS and wiring, and to prevent power outages for users, the terminals originally connected to the switch (101, 103, 113, 114, 201, 203, 213, 214, 301, 303, 313, 314) – which control switch opening and closing and transmit switch position – are connected to this test device. This prevents power outages caused by switch operation during debugging.

[0079] The low-voltage automatic transfer switch (ATS) is used for backup power between two power sources. Its basic logic is that when one power source fails, the switch is disconnected, and the bus tie switch is automatically closed. This device is used to verify the wiring after replacing the low-voltage ATS in the distribution room.

[0080] 2) How to use After the low-voltage standby automatic transfer device is replaced in the power distribution room and the wiring is completed, this device verifies the wiring.

[0081] 101, 103, 113, 114; 201, 203, 213, 214; 301, 303, 313, 314 are connected to the switch body via the cabinet-to-cabinet terminal block, etc., and then the power-on debugging steps are performed. In order to avoid frequent power outages to users during the opening and closing of the switch during the debugging process, the wiring connected to the switch body is connected to this test device accordingly, and 102, 104, 202, 204, 302, 304 are connected to the neutral wire.

[0082] The terminals "101, 103, 113, 114; 201, 203, 213, 214; 301, 303, 313, 314" for low-voltage automatic transfer switches are no longer connected to the switch body, but are instead connected to this testing device. The terminals originally connected to the switch (101, 103, 113, 114, 201, 203, 213, 214, 301, 303, 313, 314) for controlling switch opening and closing and transmitting switch position should be connected to the corresponding terminals on this testing device to prevent power outages caused by switch operation during commissioning.

[0083] The primary circuit of the switchgear is not electrically connected to this device; only the secondary circuit is connected. This device serves as a substitute for the user during commissioning of the switchgear itself.

[0084] After wiring is completed, it is debugged to prevent power outages caused by switch operation.

[0085] During the commissioning process, 101, 201, and 301 transmit closing signals, 103, 203, and 303 transmit opening signals, and 113, 114, 213, 214, 313, and 314 are used to transmit switch positions.

[0086] 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 that embodiment or example is included in at least one embodiment or example of the invention. In this specification, 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.

[0087] 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 low-voltage standby automatic transfer simulation test device, characterized in that, include: The main switch simulation module includes at least three simulation switch units, used to simulate the physical actions and states of the main switches in the low-voltage incoming cabinet and bus tie cabinet; The signal interaction module is electrically connected to the main switch analog module. The signal interaction module is equipped with a control signal input terminal and a status signal output terminal. The control signal input terminal is used to receive the opening or closing control signal from the external automatic transfer device under test and drive the corresponding analog switch unit to operate. The status signal output terminal is used to feed back the status signal after the operation of the analog switch unit to the automatic transfer device under test. The operation panel module is electrically connected to the main switch simulation module and is used to provide a local manual operation interface for manually controlling the opening and closing status of the simulation switch unit.

2. The low-voltage standby automatic transfer simulation test device according to claim 1, characterized in that, Each analog switch unit includes: The contactor, whose main contact states are open and closed, is used to simulate the opening and closing states of a low-voltage main switch. The self-locking circuit consists of the closing button and the normally open auxiliary contact of the contactor connected in parallel, and is used to maintain the contactor's energized state after triggering. The trip button is connected in series in the self-locking circuit and is used to cut off the self-locking circuit after being triggered.

3. The low-voltage standby automatic transfer simulation test device according to claim 2, characterized in that, Each analog switch unit also includes: The closing indicator and the opening indicator are connected to the normally open and normally closed auxiliary contacts of the contactor, respectively, to visually display the current status of the analog switch unit.

4. The low-voltage standby automatic transfer simulation test device according to claim 2 or 3, characterized in that, The signal interaction module includes remote closing relays and remote opening relays corresponding to each analog switch unit; The coil of the remote control closing relay forms the closing signal input terminal of the control signal input terminal, and its normally open contact is connected in parallel with the closing button; The coil of the remote-controlled trip relay forms the trip signal input terminal of the control signal input terminal, and its normally closed contact is connected in series with the trip button.

5. The low-voltage standby automatic transfer simulation test device according to claim 4, characterized in that, The status signal output terminals include a closed position signal terminal led out from the normally open auxiliary contact of the contactor and an open position signal terminal led out from the normally closed auxiliary contact.

6. The low-voltage standby automatic transfer simulation test device according to claim 1, characterized in that, The device is portable, with all modules integrated into one box. The wiring terminals for the operation panel module and the signal interaction module are located on the box panel.

7. A method for testing using any one of the low-voltage standby automatic transfer simulation test devices as described in claims 1-6, characterized in that, Includes the following steps: Wiring steps: Connect the secondary control lines and status signal lines of the low-voltage standby automatic transfer device in the power distribution room under test to the corresponding control signal input terminals and status signal output terminals on the test simulation device. Simulation test steps: The initial state of each analog switch unit can be manually set via the operation panel module; Simulate a power grid fault or manually trigger a simulated switch unit to trip; The device under test sends control signals to the test simulation device according to the received status signal changes and preset logic. Observe the final operating state of each simulated switch unit on the test simulation device and compare it with the expected logic of the automatic transfer switch under test to verify its function and wiring correctness.

8. The method according to claim 7, characterized in that, In the simulation test steps, the preset logic of the simulation includes at least one of the following: self-starting and self-resetting, self-starting and manual resetting, manual operation, and loop closing function.

9. The method according to claim 7, characterized in that, In the wiring process, the closing control output terminal, opening control output terminal, closing position signal input terminal, and opening position signal input terminal of the automatic transfer switch under test are connected to the terminals with the same markings on the test simulation device.

10. The method according to claim 7, characterized in that, The entire test was conducted without interrupting the primary power supply circuit in the power distribution room.

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