Logic verification system and method for 400V spare power automatic switching device with three incoming lines and two buses

Abstract

The invention relates to the technical field of relay protection verification. The invention provides a logic verification system and method for a 400V spare power automatic switching device with three incoming lines and two buses. The system comprises a relay protection tester and an auxiliary verification system. The auxiliary verification system comprises a plurality of air switches, a test terminal strip and an indication assembly, the output end of the relay protection tester is connected to the test terminal strip, the test terminal strip is connected to a plurality of voltage input points of a spare power automatic switching device through the plurality of air switches, and the plurality of air switches are connected in parallel; the indication assembly is connected to a position contact led out from a 400V circuit breaker control loop, and the 400V circuit breaker control loop is connected with a 400V primary switch; wherein the indication assembly is used for displaying the on-off state of the 400V circuit breaker in real time. The problems that an existing logic verification method of the 400V spare power automatic switching device is complex in operation, low in efficiency and large in safety risk are solved.

Description

Technical Field

[0001] This invention relates to the field of relay protection verification technology, and more specifically, to a logic verification system and method for a 400V automatic transfer switch with three incoming lines and two busbars. Background Technology

[0002] The power plant's auxiliary power system is a critical power source for ensuring the normal operation of the generating units. The 400V low-voltage system widely adopts a three-incoming-line, two-busbar wiring configuration to improve power supply reliability and flexibility. In this system, automatic transfer switch (ATS) devices are used to automatically switch power sources in the event of an incoming line or busbar failure, ensuring continuous power supply. However, when performing logic verification on ATS devices, because five voltage analog quantities need to be simulated with strict timing requirements for each, traditional methods often require multiple relay protection testers and numerous test personnel to operate collaboratively. This not only results in high equipment costs and complex operation but also makes verification failure highly susceptible to improper coordination, severely impacting test efficiency and system safety.

[0003] Currently, there are two main verification methods: one is to simulate voltage changes by operating the upstream circuit breaker or secondary circuit breaker through an actual energized 400V busbar, but this method requires multiple round trips, posing safety risks and being inefficient; the other is to use two or more relay protection testers to simulate voltage input and verify the automatic transfer switch logic by manually controlling the output timing of the testers, but this method requires extremely high personnel coordination and timing synchronization, and the slightest carelessness may lead to logical misjudgment, which cannot effectively guarantee the accuracy and reliability of the verification. Summary of the Invention

[0004] The purpose of this invention is to provide a logic verification system and method for a 400V automatic transfer switch with three incoming lines and two busbars, aiming to solve the problems of complex operation, low efficiency and high safety risks of existing logic verification methods for 400V automatic transfer switches.

[0005] This invention is achieved through the following technical solution: A logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars includes: a relay protection tester and an auxiliary verification system; the auxiliary verification system includes multiple circuit breakers, a test terminal block, and an indicator component; the output terminal of the relay protection tester is connected to the test terminal block, and the test terminal block is connected to multiple voltage input points of the automatic transfer switch through the multiple circuit breakers, which are connected in parallel; the indicator component is connected to a position contact led out from the control circuit of a 400V circuit breaker, and the control circuit of the 400V circuit breaker is connected to a 400V primary switch; wherein, the indicator component is used to display the open / closed status of the 400V circuit breaker in real time.

[0006] Optionally, the number of circuit breakers is five, labeled K1, K2, K3, K4 and K5 respectively; wherein, K1 is used to control the on / off of bus voltage I, K2 is used to control the on / off of bus voltage II, K3 is used to control the on / off of incoming line 1 voltage, K4 is used to control the on / off of incoming line 2 voltage, and K5 is used to control the on / off of incoming line 3 voltage.

[0007] Optionally, the relay protection tester outputs a three-phase positive sequence rated voltage, including phase A, phase B, phase C and neutral line Un; the test terminal block adopts a color-coded design, wherein phase A, phase B, phase C and neutral line correspond to yellow, green, red and gray test terminals respectively, and are connected to the automatic transfer switch through the corresponding four-color test wires.

[0008] Optionally, the indicating component includes a general terminal block and an indicator light, wherein the indicator light is electrically connected to the general terminal block to form an indicating circuit.

[0009] Optionally, there are several indicator lights, each of which corresponds to a position contact of a 400V circuit breaker.

[0010] Optionally, the position contact is led out from the 400V circuit breaker control circuit and connected to the corresponding indicator light after being converted through the ordinary terminal block.

[0011] Optionally, the open / close position terminals of the 400V circuit breaker are knife switch type terminals.

[0012] Optionally, the auxiliary verification system further includes a guide rail, on which multiple circuit breakers, the test terminal blocks, and the indicating components are mounted.

[0013] Based on the same inventive concept, this invention also provides a logic verification method for a 400V automatic transfer switch with three incoming lines and two busbars, and a logic verification system for the 400V automatic transfer switch with three incoming lines and two busbars, comprising the following steps: The output terminal of the relay protection tester is connected to multiple voltage input points of the standby automatic transfer device through the test terminal block of the auxiliary verification system, and the indicator component is connected to the position contact led out from the 400V circuit breaker control circuit. Start the relay protection tester and output the three-phase positive sequence rated voltage to the test terminal block; By operating multiple circuit breakers in the auxiliary verification system, the on / off state of each voltage input point sent to the standby automatic transfer device is independently controlled, simulating the changes in the energized or de-energized state of the bus or incoming line in the power grid. The indicator component is used to observe the opening and closing status changes of the 400V circuit breaker in real time, and to verify whether the logic operation of the automatic transfer switch meets expectations based on the status changes.

[0014] Optionally, the circuit breaker controls the voltage timing of the input to the automatic transfer switch through opening and closing operations to simulate the energized or de-energized states under different logic conditions.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: By integrating multiple circuit breakers and test terminal blocks into the auxiliary calibration system, only one relay protection tester is needed to simulate multiple voltage inputs, simplifying the wiring process and avoiding the complexity of coordinating multiple devices in traditional methods. At the same time, it reduces the need for personnel coordination, significantly shortens calibration time, and improves testing efficiency.

[0016] This avoids the risk of electric shock and equipment malfunction caused by frequent operation of upstream circuit breakers or secondary circuit breakers in traditional methods; the indicator component displays the open / closed status of the 400V circuit breaker in real time, allowing test personnel to intuitively monitor the status of the primary system and ensure that the verification process is carried out under safe and controllable conditions.

[0017] The auxiliary verification system ensures the timing synchronization of each voltage analog quantity by connecting the circuit breaker and the test terminal block in parallel. This effectively eliminates timing errors caused by human operation, reduces the probability of logic misjudgment, and improves the accuracy of the logic verification of the automatic transfer switch, thereby ensuring the power supply reliability of the plant power system.

[0018] The elimination of the need for multiple relay protection testers reduces equipment investment and maintenance costs; at the same time, the requirement for test personnel is reduced from multiple to one, lowering labor costs and resulting in significant economic benefits.

[0019] The system has a simple structure and is easy to operate, and can adapt to different on-site working conditions. The modular design of the test terminal block and circuit breaker facilitates expansion and maintenance, and is suitable for the periodic verification of automatic transfer switches in various scenarios. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the logic verification system of a 400V standby automatic transfer device with three incoming lines and two busbars according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the indicator component structure of the logic verification system of a 400V standby automatic transfer device with three incoming lines and two busbars according to an embodiment of the present invention. Figure 3 This is a flowchart illustrating the logic verification method for a 400V standby automatic transfer device with three incoming lines and two busbars according to an embodiment of the present invention. Diagram: 1-Relay protection tester, 2-Auxiliary verification system, 201-Circuit breaker, 202-Test terminal block, 203-Indicator assembly, 2031-Ordinary terminal block, 2032-Indicator light, 204-Guide rail, 3-Automatic transfer switch, 4-400V primary switch. Detailed Implementation

[0021] The following is a detailed description of the embodiments, in conjunction with the accompanying drawings.

[0022] Reference Figure 1 A logic verification system for a 400V automatic transfer switch (ATS) device with three incoming lines and two busbars includes: a relay protection tester 1 and an auxiliary verification system 2. The auxiliary verification system 2 includes multiple circuit breakers 201, a test terminal block 202, and an indicator component 203. The output terminal of the relay protection tester 1 is connected to the test terminal block 202, which is connected to multiple voltage input points of the ATS device 3 via the multiple circuit breakers 201, which are connected in parallel. The indicator component 203 is connected to a position contact led out from the 400V circuit breaker control circuit, which is connected to a 400V primary switch 4. The indicator component is used to display the open / closed status of the 400V circuit breaker in real time. The relay protection tester 1 outputs a standard three-phase positive sequence rated voltage (secondary voltage) as an analog power input. The indicator component 203 can be composed of an indicator light (such as an LED) or a small relay. Its input terminal is directly connected in parallel to the auxiliary normally open / normally closed contact of the 400V primary switch 4 (such as 1DL, 2DL, 3DL, 4DL circuit breakers). When the circuit breaker is closed, its auxiliary contact is connected, and the corresponding indicator light on the indicator component 203 lights up, clearly and in real time displaying the actual position status of the primary switch on site.

[0023] In some embodiments, the number of circuit breakers is five, labeled K1, K2, K3, K4, and K5 respectively; where K1 controls the on / off state of bus voltage I, K2 controls the on / off state of bus voltage II, K3 controls the on / off state of incoming line 1 voltage, K4 controls the on / off state of incoming line 2 voltage, and K5 controls the on / off state of incoming line 3 voltage. The energized / de-energized state of the busbar or incoming line is simulated by opening / closing the circuit breakers, controlling the input and disconnection of voltage signals. According to the verification scheme, a set of three-phase voltage values ​​(e.g., 57.7V) representing normal system operation are pre-set on the relay protection tester 1. All circuit breakers 201 in the auxiliary verification system 2 that need to simulate "voltage" are closed. For example, before the test, all five circuit breakers are closed so that all voltage input points of the automatic transfer switch 3 experience normal voltage. The test personnel may need to simulate "de-energization of incoming line #1". At this point, without changing the output of the tester, it is only necessary to disconnect the two circuit breakers 201 in the auxiliary verification system 2 corresponding to "Bus Voltage of Incoming Line I" and "Bus Voltage of Incoming Line II". This operation instantly sends the "loss of voltage" signal to the automatic transfer switch 3, while the other voltage input points of the device remain in a "voltaged" state, thus simulating the working condition where a fault in the No. 1 incoming line causes the two busbars connected to it to lose voltage, while the No. 2 / No. 3 incoming lines are normal. After receiving the voltage change sequence, the automatic transfer switch 3 should start according to the preset logic; the test personnel should simultaneously observe the indicator component 203 to see whether the tripping and closing commands issued by the automatic transfer switch 3 are executed correctly, that is, whether the position indicator of the corresponding 400V circuit breaker 4 changes as expected (e.g., tripping 1DL and closing 3DL). The whole process does not require multiple people to operate multiple devices, nor does it require the operator to operate the device once. If other logic (e.g., loss of power in the No. 2 incoming line) needs to be tested, simply keep the voltage output on the tester unchanged and operate the corresponding different circuit breaker combinations on the auxiliary verification system 2. The operation is extremely simple and fast.

[0024] In some embodiments, the relay protection tester outputs three-phase positive sequence rated voltages, including phase A, phase B, phase C, and neutral line Un. The test terminal block adopts a color-coded design, where phase A, phase B, phase C, and neutral line correspond to yellow, green, red, and gray test terminals, respectively, and are connected to the automatic transfer switch (ATS) via corresponding four-color test leads. The phase A output of the relay protection tester (via yellow test lead) is connected to the yellow terminal of the test terminal block, the phase B output (green lead) is connected to the green terminal, the phase C output (red lead) is connected to the red terminal, and the neutral line Un output (gray lead) is connected to the gray terminal. The other side of the test terminal block is connected to the corresponding voltage input points of the ATS (such as the voltage circuits of bus I, bus II, incoming line 1, incoming line 2, and incoming line 3) via parallel circuit breakers (K1-K5). Since the ATS needs to monitor multiple voltage points (such as two bus sections and three incoming lines), the three-phase voltage output by the relay protection tester is distributed to each voltage input point through the test terminal block and circuit breakers. The color-coded design ensures consistency in phase sequence and polarity, preventing incorrect cross-connections. During calibration, the tester only needs to operate the circuit breakers to simulate voltage switching (e.g., disconnecting K3 and K4 to simulate power loss on incoming line 1), while the relay protection tester maintains its rated voltage output throughout. The color-coded terminal blocks make the wiring clear at a glance, eliminating the need for repeated phase sequence checks.

[0025] In some embodiments, refer to Figure 2The indicating component includes a general-purpose terminal block and indicator lights, which are electrically connected to the general-purpose terminal block to form an indicating circuit. The indicating component 203 mainly consists of a general-purpose terminal block and indicator lights (such as LED signal lights or indicator lights driven by small relays). The general-purpose terminal block serves as a wiring hub, reliably connecting the position contacts (usually auxiliary normally open or normally closed contacts) from the control circuit of a 400V primary switch 4 (such as circuit breakers 1DL, 2DL, 3DL, 4DL). The indicator lights are electrically connected to the general-purpose terminal block via wires, forming independent indicating circuits. Each indicator light corresponds to one circuit breaker and is used to indicate its open / closed status. Control cables from the auxiliary contacts (such as normally open contacts) of each circuit breaker are connected to the input terminal of the general-purpose terminal block. The output terminal of the general-purpose terminal block is connected to one end of the indicator light, and the other end of the indicator light is connected to a control power supply (such as DC 220V or AC 220V). When the circuit breaker is closed, its auxiliary normally open contact closes, the indicating circuit is energized, and the corresponding indicator light illuminates; when the circuit breaker is open, the auxiliary contact opens, and the indicator light goes out. This design creates an intuitive display loop synchronized with the circuit breaker's status. During verification, testers do not need to directly observe the primary switch; instead, they can monitor the circuit breaker's operation in real time through the indicator lights on the indicator components. For example, when the automatic transfer switch 3 triggers a trip command, the corresponding circuit breaker's indicator light will turn off; when a closing command is executed, the indicator light will illuminate. Testers can simultaneously record the indicator light changes to verify the correctness of the automatic transfer switch logic. The indicator lights provide immediate visual feedback on the circuit breaker's open and closed status, allowing testers to clearly and intuitively grasp the action results of the automatic transfer switch, avoiding the cumbersome process of relying on multimeter measurements or on-site inspection of the circuit breaker in traditional methods, greatly improving verification efficiency. The indicator components are connected to the low-voltage signal (secondary circuit) of the circuit breaker control circuit, not the primary high-voltage equipment, allowing testers to operate and observe from a safe distance, effectively reducing the risk of electric shock or safety hazards caused by misoperation.

[0026] In some embodiments, there are several indicator lights, each corresponding to a position contact of a 400V circuit breaker. An auxiliary normally open contact that most directly reflects the mechanical opening and closing state is drawn from the control circuit of each circuit breaker. The state of this contact is synchronized with the main contacts of the circuit breaker: the normally open contact closes when the circuit breaker is closed; the normally open contact opens when the circuit breaker is open. The drawn contact cables are connected to the general terminal block of the indicating assembly 203. Each circuit breaker contact occupies a separate set of terminals on the terminal block. When the 1DL circuit breaker is closed, its auxiliary normally open contact closes, the above-mentioned indicator circuit is activated, and the corresponding LED1 indicator light illuminates, clearly indicating to the test personnel that "1DL is in the closed position". When the automatic transfer switch 3 issues a trip command to open the 1DL circuit breaker, its auxiliary normally open contact opens, the indicator circuit is de-energized, and the LED1 indicator light goes out, intuitively displaying "1DL has been opened". Similarly, when the automatic transfer switch issues a closing command (such as closing the 3DL circuit breaker) and executes it successfully, the indicator light of the 3DL circuit breaker will change from off to on.

[0027] In some embodiments, position contacts are led out from the 400V circuit breaker control circuit and connected to the corresponding indicator light after being transferred through a standard terminal block. An auxiliary contact directly reflecting the mechanical opening and closing status of the circuit breaker is led out from the control circuit of each 400V primary switch (e.g., circuit breakers 1DL, 2DL, 3DL, 4DL). This auxiliary contact can be a normally open contact. The auxiliary contact is led to the standard terminal block of the auxiliary verification system via a control cable. Each circuit breaker's contact occupies a separate set of terminals. The standard terminal block serves as a transfer hub, providing standardized and reliable wiring points for easy connection and subsequent maintenance. One end of the indicator light (e.g., an LED indicator light) is connected to the output terminal of the standard terminal block, and the other end is connected to a control power supply (e.g., DC 220V or AC 220V), thus forming an independent indicating circuit. When the circuit breaker closes, its auxiliary normally open contact closes, the indicating circuit is connected, and the corresponding indicator light illuminates; when the circuit breaker opens, the auxiliary contact opens, and the indicator light goes out. The indicator circuit based on the auxiliary contacts of the circuit breaker is strictly synchronized with the actual status of the primary switch, ensuring the accuracy and reliability of the status display and avoiding logic verification errors caused by human misjudgment or measurement errors in traditional methods.

[0028] In some embodiments, the open / close position terminals of the 400V circuit breaker are knife-switch type terminals. Knife-switch type terminals have a clear physical disconnect point, enabling reliable isolation between the indicating circuit and the circuit breaker control circuit. During verification, test personnel can quickly and safely connect or disconnect the position contacts by operating the knife switch, avoiding the risk of electric shock that may arise from directly operating high-voltage equipment or complex wiring in traditional methods. Simultaneously, the mechanical structure of the knife-switch type terminals ensures effective isolation, reducing the risk of short circuits or false signals due to accidental contact or poor insulation, thus complying with electrical safety regulations.

[0029] In some embodiments, the auxiliary calibration system further includes a guide rail, on which multiple circuit breakers, test terminal blocks, and indicating components are mounted. The guide rail can be a standard industrial guide rail, fixedly installed inside the housing or panel of the auxiliary calibration system 2, for example, a general-purpose 35mm or G-type guide rail. The multiple circuit breakers 201 (K1 to K5) are all rail-mountable miniature circuit breakers (MCBs) with snap-fit ​​designs at their bottoms for direct mounting on the guide rail. The test terminal blocks 202 and ordinary terminal blocks 2031 also have mounting slots or clips at their bottoms that match the guide rails, allowing for easy fixing on the same or multiple parallel guide rails. During installation, the guide rails are first positioned and tightened, and then the circuit breakers 201, test terminal blocks 202, and ordinary terminal blocks 2031 are sequentially snapped into the guide rails according to a preset layout to complete the mechanical fixation. Electrical connections between the components are made via pre-planned cables behind the panel or in the cable trays of the auxiliary calibration system 2. This rail mounting method achieves modular and standardized integration of core components such as circuit breakers and terminal blocks. All calibration components are compactly and orderly fixed on the same support surface, forming an integrated calibration platform. This not only simplifies the system assembly process but also allows the entire auxiliary calibration system to be quickly deployed to different test sites as a complete portable unit, greatly improving the portability of the equipment and the efficiency of on-site preparation.

[0030] Based on the same inventive concept, and corresponding to any of the above embodiments, refer to... Figure 2 This invention provides a logic verification method for a 400V automatic transfer switch with three incoming lines and two busbars, and a logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars, comprising the following steps: Connect the output of the relay protection tester to multiple voltage input points of the automatic transfer switch via the test terminal block of the auxiliary calibration system, and connect the indicating component to the position contact led out from the 400V circuit breaker control circuit. Specifically: Connect the output terminals (phase A, phase B, phase C, and neutral line Un) of the relay protection tester to the test terminal block of the auxiliary calibration system via color-coded test leads (yellow, green, red, and gray corresponding to each phase). The color-coded design of the test terminal block ensures phase sequence consistency and avoids incorrect connections. Lead lines from the test terminal block to the five parallel circuit breakers (K1-K5) in the auxiliary calibration system, connecting them to the five voltage input points of the automatic transfer switch (corresponding to the voltage monitoring circuits of Bus I, Bus II, Incoming Line 1, Incoming Line 2, and Incoming Line 3). The circuit breakers are normally closed to ensure initial continuity. Lead position contacts (auxiliary normally open contacts) from the control circuit of the 400V circuit breakers (e.g., 1DL, 2DL, 3DL, 4DL), and connect them to the indicating components (e.g., LED indicator lights) via ordinary terminal blocks. Each indicator light corresponds to one circuit breaker, forming an independent indicating circuit. The position contacts use knife-switch terminals to ensure safety isolation. After confirming that all wiring is secure, close all circuit breakers (K1 to K5) of the auxiliary verification system to put all voltage input points of the automatic transfer switch into a standby state.

[0031] Start the relay protection tester and output the three-phase positive sequence rated voltage to the test terminal block. Specifically: Start the relay protection tester and output a standard three-phase positive sequence rated voltage (secondary voltage, e.g., 57.7V). The tester continuously outputs a stable voltage without requiring mid-process adjustment. The voltage is distributed to each voltage input point of the automatic transfer switch through the test terminal block and circuit breaker, simulating the normal operating state of the system (all incoming lines and busbars are energized).

[0032] By operating multiple circuit breakers in the auxiliary verification system, the on / off state of each voltage input point supplied to the automatic transfer switch is independently controlled, simulating the changes in the energized or de-energized state of the busbar or incoming line in the power grid. Specifically: According to the verification scheme (such as testing the "Incoming Line 1 Power Loss" logic), the tester only needs to disconnect the corresponding circuit breaker combination in the auxiliary verification system (for example, disconnecting K3 and K4 to control the voltage of Bus I and Bus II of Incoming Line 1 respectively), while keeping the other circuit breakers closed. This operation sends a "voltage loss" signal to the automatic transfer switch, simulating a fault in Incoming Line 1 causing a voltage loss on the connected bus, while other incoming lines remain normal. To test other logic (such as Incoming Line 2 Power Loss), simply operate different circuit breaker combinations (such as disconnecting K4 and K5) while keeping the voltage output of the tester unchanged. Circuit breaker operation is simple and requires no adjustment of the tester or primary equipment.

[0033] The indicator component monitors the opening and closing status changes of the 400V circuit breaker in real time, and verifies whether the logic operation of the automatic transfer switch meets expectations based on the status changes. Specifically: After simulating a fault by operating the circuit breaker, the automatic transfer switch (ATS) automatically triggers logic (such as tripping and closing commands) based on the voltage change sequence. Test personnel observe the opening and closing status changes of the 400V circuit breaker in real time through the indicator lights on the indicator components (e.g., 1DL indicator light off indicates tripping, 3DL indicator light on indicates closing). The expected actions (e.g., the ATS logic requires 1DL to trip and 3DL to close) are compared with the actual indicator light changes, and the results are recorded. If the indicator light changes conform to the preset logic, the verification passes; otherwise, the device or wiring problems need to be investigated. By operating different circuit breaker combinations, various fault scenarios (such as busbar undervoltage and incoming line switching) can be quickly simulated to complete a comprehensive verification.

[0034] In some embodiments, the circuit breakers control the voltage timing of the input to the automatic transfer switch (ATS) through opening and closing operations, simulating energized or de-energized states under different logic conditions. At the start of the verification, the relay protection tester continuously outputs a stable three-phase positive-sequence rated voltage. The operator closes all five circuit breakers (K1 to K5) on the auxiliary verification system. At this time, all voltage input points of the ATS (Bus I, Bus II, Incoming Line 1, Incoming Line 2, Incoming Line 3) receive normal voltage signals, simulating the system in an initial stable operating state where all incoming lines and buses are normally energized. Based on the logic (i.e., the "logic conditions") required to be verified by the ATS, the tester operates the corresponding circuit breakers in a specific sequence according to a preset fault scenario to precisely control the timing of the "energized" and "de-energized" signals at each voltage input point.

[0035] Example 1, simulating the logic of "Power failure of incoming line #1, automatic transfer switch activates incoming line #3": The test personnel simultaneously or rapidly disconnected circuit breakers K3 and K4, which control the voltage of "Incoming Line 1". This operation immediately caused the automatic transfer switch (ATS) to determine that "Bus I and Bus II connected to Incoming Line 1 are undervoltage", while the voltage of other incoming lines (by keeping K1, K2, and K5 closed) is normal. This operation simulates the instant of a fault occurrence. After detecting the above voltage timing change, the ATS, according to preset logic, after a certain delay, sequentially issues commands to "trip 1DL circuit breaker" and "close 3DL circuit breaker". The test personnel verified the correctness of the operation by observing the status changes of the indicator lights corresponding to 1DL and 3DL on the indicator assembly (1DL indicator light off, 3DL indicator light on).

[0036] Example 2, the logic for simulating "Brother I loses pressure, backup action" is as follows: Only circuit breaker K1, which controls the voltage of Bus I, is disconnected, while the other circuit breakers (K2 to K5) remain closed. This simulates a situation where only Bus I experiences a voltage loss, but Bus II and all incoming line voltages remain normal. The automatic transfer switch (ATS) distinguishes this situation and executes the corresponding bus switching logic. Test personnel verify this by observing the changes in indicator lights on relevant circuit breakers (such as sectionalizing circuit breakers).

[0037] In some embodiments, there are 8 ways to perform automatic backup switching, as shown in Table 1 below: Table 1. Automatic Throwing Operation Methods

[0038] The specific verification method is as follows: Verification Method 1: The relay protection device outputs three-phase positive sequence rated voltage. Close circuit breakers K1 and K2, and close primary switches 1DL and 2DL. Indicator lights R1 and R2 will illuminate. After verifying that the charging indicator on the automatic transfer switch is normal, open circuit breaker K1. The automatic transfer switch will trip 1DL and close 3DL after a delay. Indicator light R1 will turn off, and then indicator light R3 will illuminate.

[0039] Verification Method 2: The relay protector outputs three-phase positive sequence rated voltage. Close circuit breakers K1 and K5, and turn on primary switch 1DL. Indicator R1 will illuminate. After verifying that the charging indicator on the automatic transfer switch is normal, open circuit breaker K1. The automatic transfer switch will trip 1DL and close 4DL after a delay. Indicator R1 will turn off, and then indicator R4 will illuminate.

[0040] Verification Method 3: The relay protection device outputs three-phase positive sequence rated voltage. Close circuit breakers K1 and K2, and close primary switches 1DL (or 4DL) and 2DL. Indicator lights R1 (or R4) and R2 will illuminate. After verifying that the charging indicator on the automatic transfer switch is normal, open circuit breaker K2. The automatic transfer switch will trip 2DL and close 3DL after a delay. Indicator light R2 will turn off, and then indicator light R3 will illuminate.

[0041] Verification Method 4: The relay protection device outputs three-phase positive sequence rated voltage. Close circuit breakers K1 and K3, and close primary switch 4DL. At this time, indicator light R4 will light up. After checking that the charging indicator on the automatic transfer switch is normal, open K1. Simulate no voltage on bus I, trip 4DL, close 1DL, and indicator light R4 will turn off and then indicator light R1 will light up.

[0042] Method 5 Verification: The relay protection device outputs three-phase positive sequence rated voltage. Close circuit breakers K1 and K2, and close primary switches 4DL and 2DL. At this time, indicator lights R4 and R2 will illuminate. After checking that the charging indicator on the automatic transfer switch is normal, open K1, trip 4DL, close 3DL, and after indicator light R4 goes out, indicator light R3 will illuminate.

[0043] Verification Method Six: The relay protection device outputs three-phase positive sequence rated voltage. Close circuit breaker K1 and primary switches 2DL and 3DL. Indicator lights R2 and R3 will illuminate. After verifying that the charging indicator on the automatic transfer switch is normal, close K3. After a delay, 3DL will trip, 1DL will close, and indicator light R3 will turn off before indicator light R1 illuminates.

[0044] Verification Method 7: The relay protection device outputs three-phase positive sequence rated voltage. Close circuit breaker K1 and primary switch 4DL. At this time, indicator light R4 will light up. After checking that the charging indicator on the automatic transfer switch is normal, close K3. After a delay, 4DL will trip, and after a delay, 1DL will close. After R4 light goes out, R1 light will light up.

[0045] Method 8 Verification: The relay protection device outputs three-phase positive sequence rated voltage. Close circuit breakers K1 and K2, and close primary switches 1DL (or 4DL) and 3DL. At this time, indicator lights R1 (or R4) and R3 will light up. After checking that the charging indicator on the automatic transfer switch is normal, close K4. After a delay, 3DL will trip, and after another delay, 2DL will close. After indicator light R3 goes out, indicator light R2 will light up.

Claims

1. A logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars, characterized in that, include: The system includes a relay protection tester and an auxiliary verification system. The auxiliary verification system comprises multiple circuit breakers, a test terminal block, and an indicator component. The output terminal of the relay protection tester is connected to the test terminal block, which is connected to multiple voltage input points of an automatic transfer switch via the multiple circuit breakers. The multiple circuit breakers are connected in parallel. The indicator component is connected to a position contact derived from the control circuit of a 400V circuit breaker. The 400V circuit breaker control circuit is connected to a 400V primary switch. The indicator component is used to display the open / closed status of the 400V circuit breaker in real time.

2. The logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in claim 1, characterized in that, The number of circuit breakers is five, labeled K1, K2, K3, K4 and K5 respectively; among them, K1 is used to control the on / off of bus I voltage, K2 is used to control the on / off of bus II voltage, K3 is used to control the on / off of incoming line 1 voltage, K4 is used to control the on / off of incoming line 2 voltage, and K5 is used to control the on / off of incoming line 3 voltage.

3. The logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in claim 1, characterized in that, The relay protection tester outputs a three-phase positive sequence rated voltage, including phase A, phase B, phase C and neutral line Un; the test terminal block adopts a color-coded design, wherein phase A, phase B, phase C and neutral line correspond to yellow, green, red and gray test terminals respectively, and are connected to the automatic transfer switch through the corresponding four-color test wires.

4. The logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in claim 1, characterized in that, The indicating component includes a standard terminal block and an indicator light, with the indicator light electrically connected to the standard terminal block to form an indicating circuit.

5. The logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in claim 4, characterized in that, There are several indicator lights, and each indicator light corresponds to a position contact of a 400V circuit breaker.

6. The logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in claim 5, characterized in that, The position contact is led out from the 400V circuit breaker control circuit and connected to the corresponding indicator light after being transferred through the ordinary terminal block.

7. The logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in claim 1, characterized in that, The opening and closing position terminals of the 400V circuit breaker are knife switch type terminals.

8. The logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in claim 1, characterized in that, The auxiliary verification system also includes a guide rail, on which multiple circuit breakers, test terminal blocks, and indicator components are mounted.

9. A logic verification method for a 400V automatic transfer switch with three incoming lines and two busbars, based on the logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in any one of claims 1-8, characterized in that, Including the following steps: The output terminal of the relay protection tester is connected to multiple voltage input points of the standby automatic transfer device through the test terminal block of the auxiliary verification system, and the indicator component is connected to the position contact led out from the 400V circuit breaker control circuit. Start the relay protection tester and output the three-phase positive sequence rated voltage to the test terminal block; By operating multiple circuit breakers in the auxiliary verification system, the on / off state of each voltage input point sent to the standby automatic transfer device is independently controlled, simulating the changes in the energized or de-energized state of the bus or incoming line in the power grid. The indicator component is used to observe the opening and closing status changes of the 400V circuit breaker in real time, and to verify whether the logic operation of the automatic transfer switch meets expectations based on the status changes.

10. The logic verification system for a 400V automatic transfer switch with three incoming lines and two busbars as described in claim 9, characterized in that, The circuit breaker controls the voltage timing of the input to the automatic transfer switch through its opening and closing operations, simulating the energized or de-energized states under different logic conditions.

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