A test system and method for ATS device incoming line phase loss automatic switching test

Abstract

A test system and method for the automatic switching test of the incoming line phase loss of an ATS device. The test system is electrically connected to the ATS device, and includes an AC power input module, an AC voltage monitoring module, a processor, a contact on-off output module, and a switch input module. The contact on-off output module simulates the incoming line phase loss fault of the ATS device. When simulating the incoming line phase loss fault, the AC voltage monitoring module monitors the AC voltage of the ATS device, and the switch input module monitors the automatic switching of the ATS device action relay. The processor determines whether the ATS device can perform automatic switching when the incoming line phase loss fault occurs based on the AC voltage monitoring situation and the automatic switching situation of the relay. The test method replaces the method of manually disconnecting the AC voltage input measurement fuse of the ATS controller, avoiding the risk of electric shock and damage to the AC incoming line fuse during the test, and providing important support for ensuring the normal operation of power equipment such as power plants and substations.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and more specifically, to a test system and method for an ATS device incoming line phase loss automatic switching test. Background Art

[0002] The three-phase AC loads such as DC charging devices, main transformer coolers, submersible pumps, and fire pumps in the substation may be damaged if they are operated in a phase-loss state for a long time. When the circuit is equipped with a phase-loss protector, the phase-loss protector will cut off the motor control circuit when a phase loss occurs, causing the load to stop running. In order to ensure the normal operation of important AC loads, it is required that when any phase of the three-phase AC power supply is lost, the station AC switching device should be able to quickly sense and complete the normal power switching. In addition, it is mentioned in the anti-accident measures for the power grid: In order to prevent the station AC system from losing power, the AC distribution panel incoming line phase loss self-transfer test should be carried out phase by phase.

[0003] Automatic transfer switching equipment (ATS) is widely used in power places such as substations and power plants. The function of ATS is to automatically switch the load circuit from one power source to another (backup) power source. Its main function is to ensure the sustainability of power supply in important power-consuming places. When the main power source is powered off, overvoltage, undervoltage, or phase loss occurs, ATS can automatically switch the load circuit to the backup power source. When the main power source is powered on again, ATS switches the load to the main power source to ensure continuous and reliable operation of important loads.

[0004] In the prior art, the main test method for the ATS device incoming line phase loss self-closing test is: when the ATS is normally energized, manually disconnect the AC voltage input measurement fuse of the ATS controller. However, the circuit is a 380V incoming power supply, which poses a great risk of electric shock. In addition, disconnecting the terminal block fuse when energized can easily damage the AC incoming line fuse, which is not conducive to implementation in infrastructure work and affects the normal commissioning of the equipment. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a test system and method for the ATS device incoming line phase loss automatic switching test, which replaces the existing method of manually disconnecting the ATS controller AC voltage input measurement fuse during the infrastructure construction stage of power plants and substations, avoids the risk of electric shock and damage to the AC incoming line fuse during the test, and provides important support for ensuring the normal operation of power equipment such as power plants and substations.

[0006] The present invention adopts the following technical solution.

[0007] A test system for an ATS device incoming line phase loss automatic switching test, the test system is electrically connected to the ATS device, the test system comprises an AC power input module and an AC voltage monitoring module, and the AC power input module is connected to a 220V AC power supply.

[0008] The test system also includes: a processor, a contact on-off output module and a switch input module; the processor is connected to the AC power input module, the AC voltage monitoring module, the contact on-off output module and the switch input module;

[0009] Contact on-off output module, used to simulate the phase failure of the incoming line of the ATS device;

[0010] AC voltage monitoring module, used to monitor the AC voltage of the ATS device when simulating an incoming line phase failure of the ATS device;

[0011] The switch input module is used to monitor the automatic switching action of the ATS device action relay when simulating the ATS device incoming line phase failure;

[0012] The processor is used to judge whether the ATS device can perform automatic switching when simulating an incoming line phase failure of the ATS device based on the monitored AC voltage of the ATS device and the automatic switching signal of the relay.

[0013] Preferably, the AC voltage monitoring module includes three input terminals; the first input terminal is connected to the first voltage input terminal of the ATS device, the second input terminal is connected to the second voltage input terminal of the ATS device, and the third input terminal is connected to the voltage output terminal of the ATS device;

[0014] Among them, the first voltage input terminal of the ATS device is connected to the first AC power supply, and the second voltage input terminal of the ATS device is connected to the second AC power supply. The first AC power supply and the second AC power supply are independent of each other and have different sources; the voltage output terminal of the ATS device outputs the voltage of the first AC power supply or the voltage of the second AC power supply.

[0015] Preferably, the contact on-off output module is connected to the AC incoming terminal block of the ATS device through a conductor;

[0016] The contact on-off output module includes: a normally closed contact and a relay for unidirectional current conduction; before simulating a phase failure of the incoming line of the ATS device, the contact on-off output module is in the on state.

[0017] Preferably, the switch input module is connected to the auxiliary contact of the ATS device action relay through a conductor.

[0018] A test method for an ATS device incoming line phase loss automatic switching test, comprising:

[0019] Step 1: The test system is connected to a 220V AC power supply and is reliably grounded;

[0020] Step 2, reliably connect the test system to the ATS device;

[0021] Step 3: After the ATS device is powered on, a test system is used to simulate a phase failure of the incoming line of the ATS device;

[0022] Step 4, when simulating a phase failure of the incoming line of the ATS device, the test system collects the AC voltage of the ATS device and the automatic switching signal of the action relay;

[0023] Step 5, judging whether the ATS device can perform automatic switching when there is a phase failure in the incoming line according to the AC voltage of the ATS device and the automatic switching action of the action relay.

[0024] Preferably, in step 2, the test system is reliably connected to the ATS device, including: reliably connecting the contact on-off output module to the AC incoming terminal block of the ATS device through a conductor, connecting the switch input module to the auxiliary contact of the action relay of the ATS device through a conductor, reliably connecting the first input end of the AC voltage monitoring module to the first voltage input end of the ATS device, reliably connecting the second input end of the AC voltage monitoring module to the second voltage input end of the ATS device, and reliably connecting the third input end of the AC voltage monitoring module to the voltage output end of the ATS device.

[0025] Preferably, step 4 comprises:

[0026] Step 4.1, before simulating the phase failure of the incoming line of the ATS device, keep the contact on-off output module in the on state;

[0027] Step 4.2, the relay in the contact on-off output module is energized to switch the contact from the normally closed state to the open state, that is, the contact on-off output module is switched to the open state to simulate the phase loss fault of the incoming line of the ATS device;

[0028] Step 4.3, when simulating the phase failure of the incoming line of the ATS device, the switch input module collects the automatic switching signal of the action relay of the ATS device;

[0029] Step 4.4, when simulating a phase failure of the incoming line of the ATS device, the AC voltage monitoring module collects the AC voltage signal of the ATS device.

[0030] Further, in step 4.3, when both the first AC power supply line and the second AC power supply line of the ATS device have no phase failure fault, the first AC power supply line switch is closed, and the second AC power supply line switch is closed;

[0031] When the ATS device has a phase failure in the incoming line, the automatic switching signals of the action relay include:

[0032] When the first AC power supply line of the ATS device fails in phase failure, the operating relay sends a signal to disconnect the first AC power supply line switch and close the second AC power supply line switch;

[0033] When the second AC power supply line of the ATS device fails in a phase failure, the action relay sends a signal to disconnect the second AC power supply line switch and close the first AC power supply line switch.

[0034] Further, in step 4.4, when both the first AC power supply line and the second AC power supply line of the ATS device have no phase failure, the AC voltage signals collected by the first input terminal, the second input terminal, and the third input terminal of the AC voltage monitoring module are all three-phase balanced voltages;

[0035] When the ATS device has a phase failure in the incoming line, the AC voltage signals collected by the first input terminal, the second input terminal, and the third input terminal of the AC voltage monitoring module include:

[0036] When the first AC power supply line of the ATS device fails in phase failure, the first input terminal of the AC voltage monitoring module collects the three-phase unbalanced voltage, and the second input terminal of the AC voltage monitoring module collects the three-phase balanced voltage;

[0037] When the second AC power supply line of the ATS device fails in phase, the first input terminal of the AC voltage monitoring module collects the three-phase balanced voltage, and the second input terminal of the AC voltage monitoring module collects the three-phase unbalanced voltage.

[0038] Preferably, step 5 comprises:

[0039] Step 5.1, when the first input terminal of the AC voltage monitoring module collects a three-phase unbalanced voltage and the second input terminal of the AC voltage monitoring module collects a three-phase balanced voltage, the action relay sends a signal to disconnect the incoming switch of the first AC power supply and close the incoming switch of the second AC power supply. If the third input terminal of the AC voltage monitoring module collects a three-phase balanced voltage, it is determined that the ATS device can perform automatic switching under the first AC power incoming line failure; otherwise, it is determined that the ATS device cannot perform automatic switching under the first AC power incoming line failure;

[0040] Step 5.2, when the first input end of the AC voltage monitoring module collects a three-phase balanced voltage and the second input end of the AC voltage monitoring module collects a three-phase unbalanced voltage, the action relay sends a signal to close the incoming switch of the first AC power supply and disconnect the incoming switch of the second AC power supply. If the third input end of the AC voltage monitoring module collects a three-phase balanced voltage, it is determined that the ATS device can perform automatic switching when the second AC power supply incoming line has a phase failure; otherwise, it is determined that the ATS device cannot perform automatic switching when the second AC power supply incoming line has a phase failure.

[0041] The beneficial effect of the present invention is that, compared with the prior art, it successfully realizes the ATS device incoming line phase loss automatic re-closing test, replacing the existing method of manually disconnecting the ATS controller AC voltage input measurement fuse, avoiding the risk of electric shock and damage to the AC incoming line fuse during the test, with high reliability and easy use, providing important support for ensuring the normal commissioning of power equipment such as power plants and substations, and having good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a test system for an ATS device incoming line phase loss automatic switching test according to the present invention;

[0043] The reference numerals in the figures are described as follows:

[0044] 1- Processor;

[0045] 2-AC power input module;

[0046] 3-AC voltage monitoring module;

[0047] 4-contact on-off output module;

[0048] 5-Switch input module;

[0049] Figure 2 The present invention is a flowchart of a test method for an ATS device incoming line phase loss automatic switching test. DETAILED DESCRIPTION

[0050] The present application is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present application.

[0051] like Figure 1 A test system for an ATS device incoming line phase loss automatic switching test, the test system is electrically connected to the ATS device, the test system includes an AC power input module 2 and an AC voltage monitoring module 3, and the AC power input module 2 is connected to a 220V AC power supply.

[0052] In this preferred embodiment, the interface of the AC input power module adopts an aviation socket, which is connected to an AC 220V power supply through an aviation plug power cord to achieve normal power supply for the test system.

[0053] The test system also includes: a processor 1, a contact on / off output module 4 and a switch input module 5; the processor 1 is connected to the AC power input module 2, the AC voltage monitoring module 3, the contact on / off output module 4 and the switch input module 5.

[0054] The contact on-off output module 4 is used to simulate the phase loss fault of the incoming line of the ATS device.

[0055] The AC voltage monitoring module 3 is used to monitor the AC voltage of the ATS device when simulating a phase loss fault in the incoming line of the ATS device.

[0056] The switch quantity input module 5 is used to monitor the automatic switching action of the ATS device action relay when simulating a phase failure of the incoming line of the ATS device.

[0057] Processor 1 is used to judge whether the ATS device can perform automatic switching when simulating an incoming line phase failure of the ATS device according to the monitored AC voltage of the ATS device and the automatic switching signal of the relay.

[0058] Preferably, the AC voltage monitoring module 3 includes three input terminals, the first input terminal is connected to the first voltage input terminal of the ATS device, the second input terminal is connected to the second voltage input terminal of the ATS device, and the third input terminal is connected to the voltage output terminal of the ATS device.

[0059] Among them, the first voltage input terminal of the ATS device is connected to the first AC power supply, and the second voltage input terminal of the ATS device is connected to the second AC power supply. The first AC power supply and the second AC power supply are independent of each other and have different sources; the voltage output terminal of the ATS device outputs the voltage of the first AC power supply or the voltage of the second AC power supply.

[0060] In a preferred embodiment of the present invention, the first voltage input terminal is connected to the 380V three-phase AC first incoming line of the ATS device, i.e., the main power supply terminal, and the second voltage input terminal is connected to the 380V three-phase AC second incoming line of the ATS device, i.e., the secondary power supply terminal. The two 380V three-phase AC incoming lines of the ATS device are independent of each other and have different sources. The voltage output terminal of the ATS device is the 380V three-phase AC voltage output after the device automatically switches, i.e., the output voltage of the ATS device is any one of the 380V three-phase AC first incoming line of the ATS device and the 380V three-phase AC second incoming line of the ATS device.

[0061] The contact on-off output module 4 is connected to the AC incoming line terminal block of the ATS device through a conductor.

[0062] The contact on-off output module 4 includes: a normally closed contact and a relay for unidirectional current conduction; before simulating a phase-loss fault in the incoming line of the ATS device, the contact on-off output module is in a conducting state.

[0063] In this preferred embodiment, the contact on-off output module 4 adopts a normally closed contact with unidirectional current conduction. Before the contact disconnect button is pressed, the contact is in a normally closed on state; if the contact disconnect button is pressed, the relay in the contact on-off output module 4 is energized, and the contact changes from a conducting state to a disconnected state, thereby simulating an AC incoming line phase loss fault of the ATS device; if the contact conduction button is pressed again, the ATS device resumes normal operation, and the incoming line phase loss test simulation ends.

[0064] The switch quantity input module 5 is connected to the auxiliary contact of the ATS device action relay through a conductor.

[0065] In this preferred embodiment, the interfaces of the contact on-off output module 4 and the switch input module 5 are both plug-in interfaces; the interface of the AC voltage monitoring module 3 is three relatively independent cellular interfaces.

[0066] The test system also includes: a grounding protection module; the test system achieves reliable grounding through the grounding protection module to ensure the safety of personnel during the test process.

[0067] In this preferred embodiment, the test system is also equipped with a display screen, through which information such as AC voltage, switch quantity, and alarm can be viewed, making it convenient to read data during the test.

[0068] like Figure 2 A test method for an ATS device incoming line phase loss automatic switching test includes:

[0069] Step 1: Connect the test system to a 220V AC power supply and ensure that it is grounded reliably.

[0070] Step 2: Reliably connect the test system to the ATS device.

[0071] Specifically, in step 2, the test system is reliably connected to the ATS device, including: reliably connecting the contact on-off output module to the AC incoming terminal block of the ATS device through a conductor, connecting the switch input module to the auxiliary contact of the action relay of the ATS device through a conductor, reliably connecting the first input end of the AC voltage monitoring module to the first voltage input end of the ATS device, reliably connecting the second input end of the AC voltage monitoring module to the second voltage input end of the ATS device, and reliably connecting the third input end of the AC voltage monitoring module to the voltage output end of the ATS device.

[0072] Step 3: After the ATS device is powered on, use the test system to simulate a phase loss fault in the incoming line of the ATS device.

[0073] Step 4, when simulating a phase failure of the incoming line of the ATS device, the test system collects the AC voltage of the ATS device and the automatic switching action of the action relay;

[0074] Specifically, step 4 includes:

[0075] Step 4.1, before simulating the phase loss fault of the incoming line of the ATS device, keep the contact on-off output module in the conducting state.

[0076] Step 4.2, the relay in the contact on-off output module is energized to switch the contact from the normally closed state to the open state, that is, the contact on-off output module is switched to the open state to simulate the phase loss fault of the incoming line of the ATS device.

[0077] Step 4.3, when simulating a phase failure of the incoming line of the ATS device, the switch input module collects the automatic switching action signal of the action relay of the ATS device.

[0078] Further, in step 4.3, when both the first AC power supply line and the second AC power supply line of the ATS device have no phase failure fault, the first AC power supply line switch is closed, and the second AC power supply line switch is closed;

[0079] When the ATS device has a phase failure in the incoming line, the automatic switching signals of the action relay include:

[0080] (1) When the first AC power supply line of the ATS device fails in phase failure, the operating relay sends a signal to disconnect the first AC power supply line switch and close the second AC power supply line switch;

[0081] (2) When the second AC power supply line of the ATS device fails in phase, the operating relay sends a signal to disconnect the incoming switch of the second AC power supply and close the incoming switch of the first AC power supply.

[0082] Step 4.4, when simulating a phase failure of the incoming line of the ATS device, the AC voltage monitoring module collects the AC voltage signal of the ATS device.

[0083] Further, in step 4.4, when both the first AC power supply line and the second AC power supply line of the ATS device have no phase failure, the AC voltage signals collected by the first input terminal, the second input terminal, and the third input terminal of the AC voltage monitoring module are all three-phase balanced voltages;

[0084] When the ATS device has a phase failure in the incoming line, the AC voltage signals collected by the first input terminal, the second input terminal, and the third input terminal of the AC voltage monitoring module include:

[0085] (1) When the first AC power supply line of the ATS device fails in phase failure, the first input terminal of the AC voltage monitoring module collects the three-phase unbalanced voltage, and the second input terminal of the AC voltage monitoring module collects the three-phase balanced voltage;

[0086] (2) When the second AC power supply line of the ATS device fails in phase, the first input terminal of the AC voltage monitoring module collects the three-phase balanced voltage, and the second input terminal of the AC voltage monitoring module collects the three-phase unbalanced voltage.

[0087] In a preferred embodiment of the present invention, when the two AC input lines of the ATS device are normal, the voltages collected by the first input terminal, the second input terminal, and the third input terminal of the AC voltage monitoring module are all 380V three-phase balanced voltages; when the first AC line of the ATS device is missing a phase, the AC voltage monitoring module collects the three-phase unbalanced voltage of the first input terminal, and the AC voltage monitoring module collects the voltage of the second input terminal as a 380V three-phase balanced voltage; when the second AC line of the ATS device is missing a phase, the AC voltage monitoring module collects the three-phase unbalanced voltage of the second input terminal, and the AC voltage monitoring module collects the voltage of the first input terminal as a 380V three-phase balanced voltage.

[0088] Step 5, judging whether the ATS device can perform automatic switching when there is a phase failure in the incoming line according to the AC voltage of the ATS device and the automatic switching action of the action relay.

[0089] Specifically, step 5 includes:

[0090] Step 5.1, when the first input terminal of the AC voltage monitoring module collects a three-phase unbalanced voltage and the second input terminal of the AC voltage monitoring module collects a three-phase balanced voltage, the action relay sends a signal to disconnect the incoming switch of the first AC power supply and close the incoming switch of the second power supply. If the third input terminal of the AC voltage monitoring module collects a three-phase balanced voltage, it is determined that the ATS device can perform automatic switching under the first AC power supply incoming line phase failure; otherwise, it is determined that the ATS device cannot perform automatic switching under the first AC power supply incoming line phase failure;

[0091] Step 5.2, when the first input end of the AC voltage monitoring module collects a three-phase balanced voltage and the second input end of the AC voltage monitoring module collects a three-phase unbalanced voltage, the action relay sends a signal to close the incoming switch of the first AC power supply and disconnect the AC incoming switch of the second power supply. If the third input end of the AC voltage monitoring module collects a three-phase balanced voltage, it is determined that the ATS device can perform automatic switching when the second AC power supply incoming line has a phase-loss fault; otherwise, it is determined that the ATS device cannot perform automatic switching when the second AC power supply incoming line has a phase-loss fault.

[0092] In a preferred embodiment of the present invention, the ATS device action relay switches reliably and the ATS device voltage output is normal. For example, when a phase of the 380V three-phase AC first incoming line of the ATS device is disconnected, the ATS device determines that the first incoming line has a phase failure, and the action relay should reliably switch to the 380V three-phase AC second incoming line of the ATS device, and the ATS device output voltage is the 380V three-phase AC second incoming line voltage of the ATS device (still 380V voltage). At this time, the test system should display automatic switching to the second voltage (the AC voltage monitoring module collects the normal input of the second voltage and the first voltage input is disconnected), and the ATS device voltage output displays normal, which means that the phase loss test is successful.

[0093] The beneficial effect of the present invention is that, compared with the prior art, it successfully realizes the ATS device incoming line phase loss automatic re-closing test, replacing the existing method of manually disconnecting the ATS controller AC voltage input measurement fuse, avoiding the risk of electric shock and damage to the AC incoming line fuse during the test, with high reliability and easy use, providing important support for ensuring the normal commissioning of power equipment such as power plants and substations, and having good economic and social benefits.

[0094] The applicant of the present invention has made a detailed explanation and description of the implementation examples of the present invention in conjunction with the drawings in the specification. However, those skilled in the art should understand that the above implementation examples are only preferred implementation schemes of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, but not to limit the scope of protection of the present invention. On the contrary, any improvements or modifications based on the inventive spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. A test method for an ATS device incoming line phase loss self-closing test, wherein the test system is electrically connected to the ATS device, the test system comprises an AC power input module and an AC voltage monitoring module, the AC power input module is connected to a 220V AC power supply, and is characterized in that: include Step 1: The test system is connected to a 220V AC power supply and is reliably grounded; Step 2: The test system is reliably connected to the ATS device; Step 3: After the ATS device is powered on, the test system is used to simulate a phase-loss fault in the incoming line of the ATS device; Step 4: When simulating a phase-loss fault in the incoming line of the ATS device, the test system collects the AC voltage of the ATS device and the automatic switching signal of the action relay; Step 5: Based on the AC voltage of the ATS device and the automatic switching action of the action relay, it is determined whether the ATS device can perform automatic switching when there is a phase-loss fault in the incoming line; The test system further includes: a processor, a contact on-off output module and a switch input module; the processor is connected to the AC power input module, the AC voltage monitoring module, the contact on-off output module and the switch input module; the contact on-off output module is used to simulate the phase-loss fault of the incoming line of the ATS device; the AC voltage monitoring module is used to monitor the AC voltage of the ATS device when simulating the phase-loss fault of the incoming line of the ATS device; the switch input module is used to monitor the automatic switching action of the ATS device action relay when simulating the phase-loss fault of the incoming line of the ATS device; the processor is used to judge whether the ATS device can perform automatic switching when the incoming line is missing according to the monitored AC voltage of the ATS device and the automatic switching signal of the relay when simulating the phase-loss fault of the incoming line of the ATS device; In step 2, the test system is reliably connected to the ATS device, including: reliably connecting the contact on-off output module to the AC incoming terminal block of the ATS device through a conductor, connecting the switch input module to the auxiliary contact of the action relay of the ATS device through a conductor, reliably connecting the first input end of the AC voltage monitoring module to the first voltage input end of the ATS device, reliably connecting the second input end of the AC voltage monitoring module to the second voltage input end of the ATS device, and reliably connecting the third input end of the AC voltage monitoring module to the voltage output end of the ATS device; Step 4 includes: Step 4.1, before simulating the phase-loss fault of the incoming line of the ATS device, keep the contact on-off output module in the on state; Step 4.2, energize the relay in the contact on-off output module, so that the contact switches from the normally closed state to the open state, and switches the contact on-off output module to the open state to simulate the phase-loss fault of the incoming line of the ATS device; Step 4.3, when simulating the phase-loss fault of the incoming line of the ATS device, the switch input module collects the automatic switching signal of the action relay of the ATS device; Step 4.4, when simulating the phase-loss fault of the incoming line of the ATS device, the AC voltage monitoring module collects the AC voltage signal of the ATS device.

2. A test method for an ATS device incoming line phase loss automatic switching test according to claim 1, characterized in that: The AC voltage monitoring module includes three input terminals; the first input terminal is connected to the first voltage input terminal of the ATS device, the second input terminal is connected to the second voltage input terminal of the ATS device, and the third input terminal is connected to the voltage output terminal of the ATS device; Among them, the first voltage input end of the ATS device is connected to the first AC power supply, and the second voltage input end of the ATS device is connected to the second AC power supply. The first AC power supply and the second AC power supply are independent of each other and have different sources; the voltage output end of the ATS device outputs the voltage of the first AC power supply or the voltage of the second AC power supply.

3. A test method for an ATS device incoming line phase loss automatic switching test according to claim 1, characterized in that: The contact on-off output module is connected to the AC incoming line terminal block of the ATS device through a conductor; The contact on-off output module includes: a normally closed contact and a relay that conducts current in one direction; before simulating a phase-loss fault in the incoming line of the ATS device, the contact on-off output module is in a conducting state.

4. A test method for an ATS device incoming line phase loss automatic switching test according to claim 1, characterized in that: The switch quantity input module is connected to the auxiliary contact of the ATS device action relay through a conductor.

5. The test method for the ATS device incoming line phase loss automatic switching test according to claim 1 is characterized in that: In step 4.3, when both the first AC power supply line and the second AC power supply line of the ATS device have no phase failure fault, the first AC power supply line switch is closed, and the second AC power supply line switch is closed; When the ATS device has a phase failure in the incoming line, the automatic switching signal of the action relay includes: When the first AC power supply line of the ATS device fails in phase failure, the operating relay sends a signal to disconnect the first AC power supply line switch and close the second AC power supply line switch; When the second AC power supply line of the ATS device fails in a phase failure, the action relay sends a signal to disconnect the second AC power supply line switch and close the first AC power supply line switch.

6. The test method for the ATS device incoming line phase loss automatic switching test according to claim 5 is characterized in that: In step 4.4, when both the first AC power supply line and the second AC power supply line of the ATS device have no phase failure, the AC voltage signals collected by the first input terminal, the second input terminal, and the third input terminal of the AC voltage monitoring module are all three-phase balanced voltages; When the ATS device has a phase failure in the incoming line, the AC voltage signals collected by the first input terminal, the second input terminal, and the third input terminal of the AC voltage monitoring module include: When the first AC power supply line of the ATS device fails in phase failure, the first input terminal of the AC voltage monitoring module collects the three-phase unbalanced voltage, and the second input terminal of the AC voltage monitoring module collects the three-phase balanced voltage; When the second AC power supply line of the ATS device fails in phase, the first input terminal of the AC voltage monitoring module collects the three-phase balanced voltage, and the second input terminal of the AC voltage monitoring module collects the three-phase unbalanced voltage.

7. The test method for the ATS device incoming line phase loss automatic switching test according to claim 6 is characterized in that: Step 5 includes: Step 5.1, when the first input terminal of the AC voltage monitoring module collects a three-phase unbalanced voltage and the second input terminal of the AC voltage monitoring module collects a three-phase balanced voltage, the action relay sends a signal to disconnect the incoming switch of the first AC power supply and close the incoming switch of the second AC power supply. If the third input terminal of the AC voltage monitoring module collects a three-phase balanced voltage, it is determined that the ATS device can perform automatic switching under the first AC power incoming line failure; otherwise, it is determined that the ATS device cannot perform automatic switching under the first AC power incoming line failure; Step 5.2, when the first input end of the AC voltage monitoring module collects a three-phase balanced voltage and the second input end of the AC voltage monitoring module collects a three-phase unbalanced voltage, the action relay sends a signal to close the incoming switch of the first AC power supply and disconnect the incoming switch of the second AC power supply. If the third input end of the AC voltage monitoring module collects a three-phase balanced voltage, it is determined that the ATS device can perform automatic switching when the second AC power supply incoming line has a phase failure; otherwise, it is determined that the ATS device cannot perform automatic switching when the second AC power supply incoming line has a phase failure.

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