State detection device and state detection method for a switch machine

Abstract

The application discloses a state detection device of a switch machine. A phase-off state detection circuit is connected to a three-phase input power supply, detects the state of the three-phase input power supply, and outputs the three-phase input power supply; a control circuit enables a first relay switch, collects the state of the three-phase input power supply from the phase-off state detection circuit, and stops enabling the first relay switch when it is judged that the three-phase input power supply has a phase-off fault according to the state; the first relay switch is connected to the three-phase input power supply from the phase-off state detection circuit, and outputs two-phase alternating current power supply signals in the three-phase input power supply to a second relay switch when enabled, so as to control the starting sequence of the two-phase alternating current power supply signals; and the second relay switch outputs the two-phase alternating current power supply signals input from the first relay switch to the switch machine. The state detection device has a small component volume, and can avoid the defects of high voltage resistance requirement of a filter device and easy saturation of a mutual inductor in a traditional computer interlocking system turnout phase-off protection circuit. A switch machine state detection method is also disclosed.

Description

Technical Field

[0001] This invention relates to the field of switch machine control, and more particularly to a switch machine condition detection device and condition detection method. Background Technology

[0002] Traditional computer-controlled interlocking systems for turnout phase loss protection circuits consist of current transformers, rectifier filters, and gravity relays. The three-phase power input of the switch machine is connected in series with relay contacts, and the relay coils are controlled by the three-phase power supply status. When the three-phase power supply is normal and powers the switch machine, the relay coils remain energized. When any one or more phases of the three-phase power supply fail, the relay coils lose power, causing the relay contacts to disconnect the three-phase power supply to the switch machine. However, in existing switch machine status monitoring equipment, the current transformers and gravity relays are bulky; the filters used have high voltage withstand requirements, and the transformers are prone to saturation. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a switch machine condition detection device with a small component size, which avoids the drawbacks of traditional computer interlocking system turnout phase loss protection circuits, such as high voltage withstand requirements for filter devices and easy saturation of current transformers.

[0004] To achieve the objective of this invention, an embodiment of the invention provides a state detection device for a switch machine, including a phase loss state detection circuit, a control circuit, a first relay switch, and a second relay switch; wherein...

[0005] The phase loss detection circuit is used to connect to a three-phase input power supply, detect the status of the three-phase input power supply, and output the three-phase input power supply.

[0006] The control circuit is used to enable the first relay switch, collect the status of the three-phase input power supply from the phase failure detection circuit, and stop enabling the first relay switch when it is determined that there is a phase failure fault in the three-phase input power supply based on the collected status.

[0007] The first relay switch is used to connect the three-phase input power supply from the phase loss state detection circuit, and when enabled, it outputs the AC power supply signals of two phases of the three-phase input power supply to the second relay switch to control the opening sequence of the two-phase AC power supply signals.

[0008] The second relay switch is used to output the two-phase AC power signal input from the first relay switch to the switch machine. In a specific embodiment, the first relay switch includes three input terminals, and a first output terminal, a second output terminal, and a third output terminal; wherein, the three input terminals are respectively connected to the three-phase input power supply output by the phase loss state detection circuit; the first output terminal and the second output terminal respectively output the first phase signal and the second phase signal to the second relay switch;

[0009] The second relay switch includes a first normally closed relay switch, a second normally closed relay switch, a first normally open relay switch, and a second normally open relay switch. Each of the first and second normally open relay switches has an output terminal that is connected to the input terminals of two sets of switches in the first locking device group of the switch machine. Each of the first and second normally open relay switches has an input terminal that is connected to the first phase signal and the second phase signal, respectively. Each of the first and second normally closed relay switches has an output terminal that is connected to the first input contact and the second input contact in the second locking device group of the switch machine, respectively. Each of the first and second normally closed relay switches has an input terminal that is connected to the first phase signal and the second phase signal, respectively.

[0010] The first locking device group and the second locking device group each have an output terminal of a relay switch connected to the first coil of the switch machine, and the first locking device group and the second locking device group each have an output terminal of another relay switch connected to the second coil of the switch machine.

[0011] The third output terminal of the first relay switch is connected to the third coil of the switch machine.

[0012] In one specific embodiment, the phase loss detection circuit includes three diodes connected in parallel. Each phase of the three-phase input power supply is connected to the anode of the corresponding diode, and the cathodes of the three diodes are connected together. The phase loss detection circuit also includes a first isolation optocoupler and a second isolation optocoupler connected in series between the cathodes of the three parallel diodes and the neutral line. The first isolation optocoupler is connected to the output terminal of the control circuit to receive control signals from the control circuit; the second isolation optocoupler is connected to the input terminal of the control circuit, through which the control circuit acquires the state of the three-phase input power supply.

[0013] In one specific embodiment, the phase loss detection circuit includes three sets of diodes, each corresponding to a one-to-one three-phase input power supply. Each set of diodes includes a first diode and a second diode arranged in the same direction. Each phase of the three-phase input power supply is connected between the anode of the first diode and the cathode of the second diode in the corresponding set of diodes. The cathodes of the first diodes in all three sets are connected together, and the anodes of the second diodes in all three sets are connected together. The phase loss detection circuit also includes a first isolation optocoupler and a second isolation optocoupler connected in series between the cathodes of the first diodes and the anodes of the second diodes in all three sets of diodes. The first isolation optocoupler is connected to the output terminal of the control circuit to receive control signals from the control circuit; the second isolation optocoupler is connected to the input terminal of the control circuit, through which the control circuit acquires the state of the three-phase input power supply.

[0014] In one specific embodiment, the control circuit determines that there is a phase loss fault in the three-phase input power supply based on the acquired status, including: when the signal acquired by the control circuit is a periodic pulse signal and the duty cycle of the pulse signal is within a predetermined first interval, determining that one phase of the three-phase input power supply is lost.

[0015] In one specific embodiment, the control circuit determines that there is a phase loss fault in the three-phase input power supply based on the collected status, including: when the signal collected by the control circuit is continuously at a high level, determining that two phases of the three-phase input power supply are lost.

[0016] In one specific embodiment, the control circuit determines that there is a phase loss fault in the three-phase input power supply based on the acquired status, including: when the signal acquired by the control circuit is a periodic pulse signal and the duty cycle of the pulse signal is within a predetermined second interval, determining that two phases of the three-phase input power supply are out of phase and mixed with the neutral line signal.

[0017] In one specific embodiment, the first relay switch outputs two phases of the three-phase input power supply AC power signal to the second relay switch to control the turn-on sequence of the two phase AC power signals.

[0018] To achieve the objective of this invention, an embodiment of this invention provides a state detection method for a switch machine, applied to a state detection device for a switch machine. The state detection device includes a phase loss state detection circuit, a control circuit, a first relay switch, and a second relay switch. The state detection method includes:

[0019] The status detection device detects the status of the three-phase input power supply and outputs the three-phase input power supply status.

[0020] When the control circuit determines that there is a phase loss fault in the three-phase input power supply based on the status of the three-phase input power supply collected from the phase loss state detection circuit, it stops enabling the first relay switch.

[0021] When the first relay switch is enabled, it outputs AC power signals for two phases of the three-phase input power supply to the second relay switch.

[0022] The second relay switch outputs the two-phase AC power signal input from the first relay switch to the switch machine.

[0023] In one specific embodiment, the step of the control circuit determining whether a phase loss fault exists in the three-phase input power supply based on the status of the three-phase input power supply acquired from the phase loss state detection circuit includes:

[0024] When the signal acquired by the control circuit is a periodic pulse signal, and the duty cycle of the pulse signal is within a predetermined first interval, it is determined that one phase of the three-phase input power supply is disconnected.

[0025] When the signal acquired by the control circuit remains at a high level, it is determined that two phases of the three-phase input power supply are out of phase; and

[0026] When the signal acquired by the control circuit is a periodic pulse signal, and the duty cycle of the pulse signal is within the second interval, it is determined that two phases of the three-phase input power supply are out of phase and mixed with the neutral line signal.

[0027] According to the above scheme, the control circuit, first relay switch, and second relay switch in the switch machine's condition detection equipment can control the power supply to the switch machine's coils. The switch machine's condition detection equipment does not need to use the current transformers and gravity relays of the traditional computer interlocking system's turnout phase-loss protection circuit, thus reducing its size and avoiding the drawbacks of high voltage withstand requirements for filtering devices and easy saturation of current transformers in the traditional computer interlocking system's turnout phase-loss protection circuit.

[0028] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0029] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0030] Figure 1 A circuit diagram of a switch machine condition detection device provided in an embodiment of the present invention;

[0031] Figure 2 The diagram shows a circuit diagram of a half-wave rectifier circuit in the state detection device of a switch machine provided in an embodiment of the present invention.

[0032] Figure 3 The diagram illustrates the phase loss state detection circuit in the switch machine state detection device provided in this embodiment of the invention, which is a half-wave rectifier circuit. The circuit inputs the power supply signal, rectifier signal, control signal from the control circuit, and state acquisition signal when the three-phase input is normal.

[0033] Figure 4 The diagram shows a circuit diagram of a full-wave rectifier circuit in the state detection device of a switch machine provided in an embodiment of the present invention.

[0034] Figure 5The diagram illustrates the phase loss state detection circuit in the switch machine state detection device provided in this embodiment of the invention, which is a full-wave rectifier circuit. The circuit inputs the power supply signal, rectified signal, control signal from the control circuit, and state acquisition signal when the three-phase input is normal.

[0035] Figure 6 The diagram illustrates the input power signal, rectification signal, control signal of the control circuit, and status acquisition signal of the phase loss state detection circuit in the switch machine state detection device provided in this embodiment of the invention when a phase loss state detection circuit is a half-wave rectifier circuit and one phase signal is missing.

[0036] Figure 7 The diagram illustrates the input power signal, rectified signal, control signal of the control circuit, and status acquisition signal of the phase loss state detection circuit in the switch machine state detection device provided in this embodiment of the invention when a phase loss state detection circuit is a full-wave rectifier circuit and one phase signal is missing.

[0037] Figure 8 The diagram illustrates the phase loss state detection circuit input power signal, rectified signal, control signal of the control circuit, and state acquisition signal when two phase signals are missing in the phase loss state detection circuit of the switch machine state detection device provided in this embodiment of the invention is a half-wave rectifier circuit.

[0038] Figure 9 The diagram illustrates the phase loss state detection circuit input power signal, rectification signal, control signal of the control circuit, and state acquisition signal when two phase input signals are missing in the phase loss state detection circuit of the switch machine state detection device provided in this embodiment of the invention, which is a full-wave rectifier circuit.

[0039] Figure 10 The diagram illustrates the phase loss state detection circuit in the switch machine state detection device provided by the present invention when two phase input signals are missing in the three-phase input power supply and the neutral wire signal is interfering with the input terminal line. The circuit includes the input power supply signal, rectified signal, control signal of the control circuit, and state acquisition signal.

[0040] Figure 11 A flowchart of the state detection method for a switch machine provided in an embodiment of the present invention is shown. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.

[0042] The steps illustrated in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than that presented here.

[0043] To address the aforementioned technical problems, embodiments of the present invention provide a switch machine condition detection device, such as... Figure 1 As shown, the status detection equipment of the switch machine includes a phase loss status detection circuit 100, a control circuit 200, a first relay switch 300, and a second relay switch 400.

[0044] The phase loss detection circuit 100 is used to connect to a three-phase input power supply (380VAC-A, 380VAC-B and 380VAC-C), detect the status of the three-phase input power supply, and output the three-phase input power supply to the first relay switch 300.

[0045] The control circuit 200 is used to enable the first relay switch 300, collect the status of the three-phase input power supply from the phase failure detection circuit 100, and stop enabling the first relay switch 300 when it is determined that there is a phase failure fault in the three-phase input power supply based on the collected status.

[0046] The first relay switch 300 is used to connect a three-phase input power supply from the phase loss state detection circuit 100, and when enabled, it outputs two phases of the three-phase input power supply AC power signals to the second relay switch 400 to control the opening sequence of the two phase AC power signals.

[0047] The second relay switch 400 is used to output the two-phase AC power signal input from the first relay switch 300 to the switch machine 500.

[0048] According to the above scheme, the control circuit 200 collects the status of the three-phase input power supply from the phase failure detection circuit 100, and controls the status of the first relay switch 300 when a phase failure fault is detected by the phase failure detection circuit 100. The first relay switch 300 is connected to the three-phase input power supply from the phase failure detection circuit 100, and according to the control signal received from the control circuit 200, the second relay switch 400 outputs AC power signals of two phases of the three-phase input power supply to control the power supply of the first coil 510 and the second coil 520 of the switch machine 500. The first relay switch 300 can also control the power supply of the third coil 530 of the switch machine 500. Therefore, the control circuit 200, the first relay switch 300, and the second relay switch 400 can control the power supply of the coils of the switch machine. The condition monitoring equipment for switch machines does not need to use the current transformers and gravity relays of the traditional computer interlocking system turnout phase loss protection circuit, thus reducing its size and avoiding the defects of high voltage withstand requirements of the filter device and easy saturation of the current transformer in the traditional computer interlocking system turnout phase loss protection circuit.

[0049] In one specific embodiment, the first relay switch 300 includes three input terminals, and a first output terminal, a second output terminal, and a third output terminal; that is, the first relay switch 300 includes three relay switches 1-A, 1-B, and 1-C, where relay switch 1-C has a first input terminal and a first output terminal; relay switch 1-B has a second input terminal and a second output terminal; and relay switch 1-A has a third input terminal and a third output terminal. The three input terminals are respectively connected to the three-phase input power supply output by the phase loss state detection circuit 100; the first and second output terminals output the first phase signal and the second phase signal to the second relay switch 400, respectively.

[0050] The second relay switch 400 includes a first normally closed relay switch 2-1, a second normally closed relay switch 2-3, a first normally open relay switch 2-2, and a second normally open relay switch 2-4. Each of the first normally open relay switches 2-2 and 2-4 has an output terminal that is respectively connected to the input terminals X3 and X4 of the two sets of switches 540-1 and 540-2 in the first locking device group of the switch machine 500. Each of the first normally open relay switches 2-2 and 2-4 has another terminal connected to the first phase signal and the second phase signal, respectively. Each of the first normally closed relay switches 2-1 and 2-3 has an output terminal that is respectively connected to the first input contact X5 and the second input contact X2 of the two sets of switches 550-1 and 550-2 in the second locking device group of the switch machine 500. Each of the first normally closed relay switches 2-1 and 2-3 has an input terminal connected to the first phase signal and the second phase signal, respectively.

[0051] The first and second locking device groups each have an output terminal of a relay switch connected to the first coil 510 of the switch machine 500, and each of the first and second locking device groups has an output terminal of another relay switch connected to the second coil 520 of the switch machine 500.

[0052] The third output terminal 1-A of the first relay switch is connected to the third coil 530 of the switch machine 500.

[0053] In one particular embodiment, such as Figure 2 As shown, the phase loss detection circuit 100 includes three diodes 101, 103, and 105 connected in parallel. Each phase of the three-phase input power supply is connected to the anode of the corresponding diode among the three diodes, and the cathodes of the three diodes are connected together, thus forming a three-phase half-wave rectifier circuit. The phase loss detection circuit 100 also includes a first isolation optocoupler 107 and a second isolation optocoupler 109 connected in series between the cathodes of the three parallel diodes and the neutral line N. The first isolation optocoupler 107 is connected to the output terminal of the control circuit 200 to receive the control signal from the control circuit 200. The second isolation optocoupler 109 is connected to the input terminal of the control circuit 200, and the control circuit 200 acquires the state of the three-phase input power supply through its input terminal. In addition, current-limiting resistors R1, R2, and R3 are connected in series between the three-phase power supply and the positive terminals of diodes 101, 103, and 105, respectively. A voltage-dividing resistor R4 is connected in series between the negative terminals of diodes 101, 103, and 105 and the first isolation optocoupler 107. The phase loss state detection circuit 100 also includes a threshold resistor R5 connected in parallel with the second isolation optocoupler 109, a current-limiting resistor R8 between the second isolation optocoupler 109 and the neutral line N, a current-limiting resistor R6 between the control circuit 200 and the first isolation optocoupler 107, and a current-limiting resistor R7 between the CPU power supply CPU-VCC of the control circuit 200 and the CPU202 of the control circuit 200.

[0054] like Figure 3 As shown, Figure 3 The diagram shows the voltage level waveform of the three-phase half-wave rectifier circuit described above, after rectification by diodes 101, 103, and 105 from the three-phase input power supply of the CPU202 of the control circuit 200 during operation.

[0055] In one particular embodiment, such as Figure 4As shown, the phase loss detection circuit 100 includes three sets of diodes 121, 124, and 127. The first set of diodes 121 includes two diodes, 122 and 123, arranged in the same direction. The second set of diodes 124 includes two diodes, 125 and 126, arranged in the same direction. The third set of diodes 127 includes two diodes, 128 and 129, arranged in the same direction. The three sets of diodes 121, 124, and 127 correspond one-to-one with the three-phase input power supply. Each phase of the three-phase input power supply is connected between two diodes in its corresponding set. For example, as shown... Figure 4 As shown, a single-phase input power supply of 380VAC-A is connected between the anode of the first diode 122 and the cathode of the second diode 123 in a corresponding group of diodes 121. Furthermore, the cathodes of the first diodes in the three groups are connected, and the anodes of the second diodes in the three groups are connected. Specifically, the phase loss detection circuit 100 also includes a first isolation optocoupler 107 and a second isolation optocoupler 109 connected in series between the cathode of the first diode and the anode of the second diode in the three groups of diodes; wherein, the first isolation optocoupler 107 is connected to the output terminal of the control circuit 200 to receive the control signal from the control circuit 200; the second isolation optocoupler 109 is connected to the input terminal of the control circuit 200, and the control circuit 200 acquires the status of the three-phase input power supply through the input terminal. A voltage divider resistor R4 is connected in series between the cathodes of the first diodes 122, 125, and 128 and the first isolation optocoupler 107. The phase loss detection circuit 100 also includes a threshold resistor R5 connected in parallel with the second isolation optocoupler 109, a current-limiting resistor R6 between the control circuit 200 and the first isolation optocoupler 107, and a current-limiting resistor R7 between the CPU power supply CPU-VCC of the control circuit 200 and the CPU 202 of the control circuit 200. The above circuit, when the three-phase input power supply is normal, receives the following input signals: power supply signal, rectified signal, and status acquisition signal: Figure 5 As shown.

[0056] like Figure 5As shown, the three-phase input power supply is input to the phase loss detection circuit 100. At any given time, the phase with the highest voltage level in the three-phase input power supply flows through its series current-limiting resistors R1, R2, or R3 to rectifier diodes 122, 125, or 128, and then to the voltage divider resistor R4 and the threshold resistor R5. When the threshold voltage reaches the conduction condition of the isolation optocoupler 109, the signal simultaneously flows through the threshold resistor R5 and the isolation optocoupler 109 to the phase with the lowest voltage level among the rectifier diodes 123, 123, or 129, and returns to the power ports 380VAC_A, 380VAC_B, and 380VAC_C through its series current-limiting resistors R1, R2, and R3. During this process, when the threshold voltage reaches the conduction condition of the isolation optocoupler 109, the secondary side of the isolation optocoupler 109 is turned on, and the CPU 202 of the control circuit 200 is set to low.

[0057] In one specific embodiment, when the signal acquired by the control circuit is a periodic pulse signal and the duty cycle of the pulse signal is within a predetermined first interval, it is determined that one phase of the three-phase input power supply is out of phase.

[0058] Taking the phase loss state detection circuit 100, which includes a half-wave rectifier circuit, as an example, such as Figure 6 As shown, Figure 6 The top of the diagram shows the input power supply, which is missing the 380VAC-B phase power supply. Because of the missing 380VAC-B phase power supply, some sections of the waveform after diode rectification drop to 0. The CPU 202 of the control circuit 200 collects the status at the point where the rectified waveform drops to a high level. The duration of the high level is less than 10 milliseconds (ms), and the pulse period is 50Hz.

[0059] Taking the phase loss state detection circuit 100, which includes a full-wave rectifier circuit, as an example, such as Figure 7 As shown, Figure 7 The top of the diagram shows the input signals. The 380VAC_B power signal is not connected to the phase loss detection circuit. At any given time, the phase with the highest voltage level in either the 380VAC_A or 380VAC_C power supply flows through its series current-limiting resistors R1 and R3 to either the first rectifier diode 121 or 127, then to the voltage divider resistor R4 and the threshold resistor R5. When the threshold voltage reaches the isolation optocoupler's conduction condition, the phase power signal simultaneously flows through the threshold resistor R5 and the isolation optocoupler 109 to the phase with the lowest voltage level among the rectifier diodes 123 and 129, returning to the power ports 380VAC_A and 380VAC_C through its series current-limiting resistors R1 and R3. During this process, if the threshold voltage reaches the isolation optocoupler T1's conduction condition, the secondary side of the isolation optocoupler conducts, and the CPU acquisition status is set low. Otherwise, the CPU acquisition status is pulled high. Figure 7This is only to illustrate the 380VAC_B phase loss signal. The principles of the 380VAC_A and 380VAC_C phase loss signals are the same. Figure 7 The logic shown is the same.

[0060] In one particular embodiment, the period of the pulse is 20 milliseconds, so when one phase is missing, the predetermined first interval of the duty cycle of the pulse signal can be predetermined to be 20%-30%, that is, around 25%.

[0061] In one particular embodiment, when the signal acquired by the control circuit remains at a high level, it is determined that two phases of the three-phase input power supply are out of phase.

[0062] Taking the phase loss state detection circuit 100, which includes a half-wave rectifier circuit, as an example, such as Figure 8 As shown, Figure 8 The topmost part shows the input power supply, which is missing the 380VAC-B phase and the 380VAC-C phase (any two phases can be missing). Figure 8 (Taking the absence of 380VAC-B phase and 380VAC-C phase power supply as an example). When the input power supply is missing, the rectified waveform drops to 0. The CPU 202 of the control circuit 200 acquires the status when the rectified waveform drops to a high level. The duration of the high level is less than 10ms, and the pulse period is 50Hz.

[0063] Taking the phase loss detection circuit 100, which includes a full-wave rectifier circuit, as an example, any one phase signal in the three-phase input power supply is relative to the other two phase signals. If two phase signals are missing, the remaining phase signal has no reference source, and the signal cannot form a loop. Figure 9 In the current circuit, the power input signals 380VAC_B and 380VAC_C are not connected to the phase loss detection circuit. The positive signal of the 380VAC_A signal flows through its series current limiting resistor R1 to the rectifier diode 122, and then to the voltage divider resistor R4, the threshold resistor R5, and the isolation optocoupler 109, which are cut off. The signal cannot flow back to the power port, so the value of the rectified signal should be "0". During this process, the isolation optocoupler 109 cannot be turned on, and the CPU 202 acquisition status of the control circuit 200 remains high. Figure 9 This is only to illustrate the phase loss of 380VAC_B and 380VAC_C signals; any two phase power input signals are missing. Figure 9 The logic shown is the same.

[0064] In one specific embodiment, when the signal acquired by the control circuit is a periodic pulse signal and the duty cycle of the pulse signal is within the second interval, it is determined that two phases of the three-phase input power supply are out of phase and mixed with the neutral signal.

[0065] Any one phase of the three-phase input signal is relative to the other two phases. If two phases are missing, the remaining phase has no reference source and cannot form a loop. However, if the neutral signal is connected in series with the input line, the line can form a loop. Taking the phase loss detection circuit 100, which includes a full-wave rectifier circuit, as an example... Figure 10 As shown, Figure 10 The three-phase input power signals 380VAC_B and 380VAC_C are not connected to the phase loss detection circuit. However, the neutral signal is connected in series to either phase port of 380VAC_B or 380VAC_C. Therefore, the positive signal of 380VAC_A flows through its series current-limiting resistor R1 to rectifier diode 122, voltage divider resistor R4, and threshold resistor R5. When the threshold voltage reaches the conduction condition of the isolation optocoupler, the signal simultaneously flows through threshold resistor R5 and isolation optocoupler T1 to the phase with the lowest voltage level among rectifier diodes 126 and 129, and returns to the input power port through its series current-limiting resistors R2 and R3. It should be noted that the conduction of the second isolation optocoupler 109 is controlled by the signal of the first isolation optocoupler 107. Only when the signal of the first isolation optocoupler 107 is conducting can the signal of the second isolation optocoupler 109 meet the conduction condition. During this process, when the signal of the first isolation optocoupler 107 is turned on, and the threshold voltage reaches the conduction condition of the second isolation optocoupler 109, the secondary side of the isolation optocoupler is turned on, and the acquisition state of the CPU 202 of the control circuit 200 is set low. Otherwise, the acquisition state of the CPU 202 of the control circuit 200 is pulled up to a high level. Figure 10 This is only for illustrative purposes and shows a single-phase loss of 380VAC_B and 380VAC_C signals. It indicates a missing input signal for any two phases, with the neutral signal interfering with the input circuit. Figure 10 The logic is the same. Furthermore, the power supply voltage of the circuit formed by any one phase signal and the neutral signal is the line voltage, with a rated effective value of 220VAC.

[0066] In one particular embodiment, the period of the pulse is 20 milliseconds, so the second interval of the pulse signal duty cycle when any two phase input signals are missing and the neutral signal is inserted into the input line can be predetermined to be 40%-50%.

[0067] To address the aforementioned technical problems, embodiments of the present invention provide a state detection method for a switch machine, applied to a state detection device for a switch machine. The state detection device includes a phase loss state detection circuit, a control circuit, a first relay switch, and a second relay switch, as follows: Figure 11 As shown, the state detection method includes steps S101-S107.

[0068] In step S101, the status detection device detects the status of the three-phase input power supply and outputs the three-phase input power supply.

[0069] In step S103, when the control circuit determines that there is a phase loss fault in the three-phase input power supply based on the status of the three-phase input power supply collected from the phase loss detection circuit, it stops enabling the first relay switch.

[0070] In step S105, when the first relay switch is enabled, it outputs AC power signals of two phases of the three-phase input power supply to the second relay switch.

[0071] In step S107, the second relay switch outputs the two-phase AC power signal input from the first relay switch to the switch machine.

[0072] In one embodiment, the step of the control circuit in step S103 determining whether there is a phase loss fault in the three-phase input power supply based on the state of the three-phase input power supply acquired from the phase loss state detection circuit includes:

[0073] When the signal acquired by the control circuit is a periodic pulse signal, and the duty cycle of the pulse signal is within a predetermined first interval, it is determined that one phase of the three-phase input power supply is disconnected.

[0074] When the signal acquired by the control circuit remains at a high level, it is determined that two phases of the three-phase input power supply are out of phase; and

[0075] When the signal acquired by the control circuit is a periodic pulse signal, and the duty cycle of the pulse signal is within the second interval, it is determined that two phases of the three-phase input power supply are out of phase and mixed with the neutral line signal.

[0076] While the embodiments disclosed in this invention are as described above, the above content is merely for the purpose of facilitating understanding of this invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes to the form and details of the implementation without departing from the spirit and scope disclosed in this invention; however, the scope of patent protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A condition monitoring device for a switch machine, characterized in that, It includes a phase loss detection circuit, a control circuit, a first relay switch, and a second relay switch; among which, The phase loss state detection circuit is used to connect to a three-phase input power supply, detect the state of the three-phase input power supply, and output the three-phase input power supply. The control circuit is used to enable the first relay switch, collect the status of the three-phase input power supply from the phase failure state detection circuit, and stop enabling the first relay switch when it is determined that there is a phase failure fault in the three-phase input power supply based on the collected status. The first relay switch is used to connect the three-phase input power supply from the phase failure state detection circuit, and when enabled, it outputs two phases of the AC power supply signals of the three-phase input power supply to the second relay switch to control the opening sequence of the two phase AC power supply signals. The second relay switch is used to output the two-phase AC power signal from the first relay switch to the switch machine; The control circuit determines whether there is a phase loss fault in the three-phase input power supply based on the collected status, including: When the signal acquired by the control circuit is a periodic pulse signal, and the duty cycle of the pulse signal is within a predetermined first interval, it is determined that one phase of the three-phase input power supply is disconnected. When the signal acquired by the control circuit remains at a high level, it is determined that two phases of the three-phase input power supply are disconnected. When the signal acquired by the control circuit is a periodic pulse signal, and the duty cycle of the pulse signal is within a predetermined second interval, it is determined that two phases of the three-phase input power supply are out of phase and mixed with the neutral signal.

2. The condition detection device according to claim 1, characterized in that, The first relay switch includes three input terminals, and a first output terminal, a second output terminal, and a third output terminal; wherein, the three input terminals are respectively connected to the three-phase input power supply output by the phase loss state detection circuit; the first output terminal and the second output terminal respectively output the first phase signal and the second phase signal to the second relay switch; The second relay switch includes a first normally closed relay switch, a second normally closed relay switch, a first normally open relay switch, and a second normally open relay switch. Each of the first normally open relay switch and the second normally open relay switch has an output terminal that is respectively connected to the input terminals of two sets of switches in the first locking device group of the switch machine. Each of the first normally open relay switch and the second normally open relay switch has an input terminal that is respectively connected to the first phase signal and the second phase signal. Each of the first normally closed relay switch and the second normally closed relay switch has an output terminal that is respectively connected to the first input contact and the second input contact in the second locking device group of the switch machine. Each of the first normally closed relay switch and the second normally closed relay switch has an input terminal that is respectively connected to the first phase signal and the second phase signal. The first locking device group and the second locking device group each have an output terminal of a relay switch connected to the first coil of the switch machine, and the first locking device group and the second locking device group each have an output terminal of another relay switch connected to the second coil of the switch machine. The third output terminal of the first relay switch is connected to the third coil of the switch machine.

3. The condition detection device according to claim 1, wherein, The phase loss detection circuit includes three diodes connected in parallel. Each phase of the three-phase input power supply is connected to the anode of the corresponding diode, and the cathodes of the three diodes are connected together. The phase loss detection circuit also includes a first isolation optocoupler and a second isolation optocoupler connected in series between the cathodes of the three parallel diodes and the neutral line. The first isolation optocoupler is connected to the output terminal of the control circuit to receive the control signal from the control circuit. The second isolation optocoupler is connected to the input terminal of the control circuit, and the control circuit acquires the state of the three-phase input power supply through its input terminal.

4. The condition detection device according to claim 1, wherein, The phase loss detection circuit includes three sets of diodes, each corresponding to one of the three-phase input power supplies. Each set of diodes includes a first diode and a second diode arranged in the same direction. Each phase of the three-phase input power supply is connected between the anode of the first diode and the cathode of the second diode in the corresponding set of diodes. The cathodes of the first diodes in the three sets of diodes are connected together, and the anodes of the second diodes in the three sets of diodes are connected together. The phase loss detection circuit also includes a first isolation optocoupler and a second isolation optocoupler connected in series between the cathode of the first diode and the anode of the second diode in the three sets of diodes. The first isolation optocoupler is connected to the output terminal of the control circuit to receive the control signal from the control circuit. The second isolation optocoupler is connected to the input terminal of the control circuit, and the control circuit acquires the state of the three-phase input power supply through the input terminal.

5. The condition detection device according to claim 1, wherein, The first relay switch outputs two phases of the three-phase input power supply AC power signal to the second relay switch to control the turn-on sequence of the two phases of the AC power signal.

6. A method for detecting the condition of a switch machine, applied to a switch machine condition detection device, characterized in that, The condition detection device includes a phase loss condition detection circuit, a control circuit, a first relay switch, and a second relay switch; the condition detection method includes: The status detection device detects the status of the three-phase input power supply and outputs the three-phase input power supply. When the control circuit determines that there is a phase failure in the three-phase input power supply based on the status of the three-phase input power supply collected from the phase failure state detection circuit, it stops enabling the first relay switch. When the first relay switch is enabled, it outputs AC power signals of two phases of the three-phase input power supply to the second relay switch. The second relay switch outputs the two-phase AC power signal from the first relay switch to the switch machine; The step of the control circuit determining whether there is a phase loss fault in the three-phase input power supply based on the status of the three-phase input power supply collected from the phase loss state detection circuit includes: When the signal acquired by the control circuit is a periodic pulse signal, and the duty cycle of the pulse signal is within a predetermined first interval, it is determined that one phase of the three-phase input power supply is disconnected. When the signal acquired by the control circuit remains at a high level, it is determined that two phases of the three-phase input power supply are out of phase; and When the signal acquired by the control circuit is a periodic pulse signal, and the duty cycle of the pulse signal is within a predetermined second interval, it is determined that two phases of the three-phase input power supply are out of phase and mixed with the neutral signal.

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