An aircraft AC power supply system network power supply detection system and detection method

Abstract

A detection system for the network power supply of an aircraft alternating current power supply system. The aircraft alternating current power supply system network is provided with alternating current power by the on-board right generator and left generator, auxiliary alternating current power by the on-board auxiliary generator, and ground maintenance power by the ground alternating current power socket. The detection system includes a detection test bench, two ground alternating current power supplies, and one ground direct current power supply. The two ground alternating current power supplies and one ground direct current power supply are connected to the power input port of the detection test bench, and the output port of the detection test bench is connected to the aircraft alternating current power supply system network to provide detection power for the aircraft alternating current power supply system network.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft general assembly power supply detection, and specifically to a detection system and a detection method for network power supply of an aircraft alternating current power supply system. Background Art

[0002] The first power supply of the aircraft power network is a very important node in the aircraft general assembly stage. The qualified power-on inspection of the power network is a prerequisite for the power-on commissioning of airborne equipment. Since the aircraft alternator does not have working conditions in the general assembly stage, it is necessary to use a ground alternating current power supply to simulate its work and supply power to the aircraft alternating current power network for various function detections of the alternating current power supply system. The traditional method is to simulate each alternator and ground alternating current power supply socket with a ground alternating current power supply. The number of ground alternating current power supplies required during the power-on inspection is the same as the number of aircraft alternating current power channels, resulting in low equipment utilization rate, high cost, and poor economy. Since multiple ground alternating current power supplies supply power to the aircraft alternating current power network through multiple alternating current power channel inlets, in case of a dangerous situation, it is impossible to quickly disconnect all the ground alternating current power supplies supplying power to the aircraft at the same time. When powering on the aircraft for the first time, since the ground alternating current power supply is directly connected to the wires at the inlets of each alternating current channel of the aircraft without passing through a protection device that can limit the short-circuit current, it is impossible to provide effective short-circuit protection for the equipment and wires on the aircraft during the first power supply. When performing the reverse phase sequence inspection of the ground alternating current power supply, it is also necessary to remove the A and C phase wires of the ground alternating current power supply socket for exchange to adjust the phase sequence. After the reverse phase sequence inspection, it needs to be restored to the original state, with repeated operations, which is time-consuming, laborious, and unsafe. Summary of the Invention

[0003] In order to solve the above problems, the present application provides a detection system and a detection method for network power supply of an aircraft alternating current power supply system. Through the electrical components and control circuits installed inside the detection test bench, the two-way input of two ground alternating current power supplies is changed into four-way output to supply power to the aircraft alternating current power supply system network, especially realizing functions such as parallel power supply of left and right generators, short-circuit protection during the first power supply, rapid power-off in case of an emergency, automatic conversion of the forward and reverse phase sequences of the ground alternating current power supply, forward and reverse phase sequence interlocking, input and output display, etc.

[0004] To achieve the above objectives, the present application adopts the following technical solutions:

[0005] A detection system for network power supply of an aircraft AC power supply system. The aircraft AC power supply system network is supplied with AC power by the on-board right generator and left generator, with auxiliary power supplied by the on-board auxiliary AC generator, and ground maintenance power supplied by the ground AC power socket. It is characterized in that the detection system includes a detection test bench, two ground AC power supplies and one ground DC power supply. The two ground AC power supplies and one ground DC power supply are connected to the power input ports of the detection test bench, and the output ports of the detection test bench are connected to the aircraft AC power supply system network to provide detection power for the aircraft AC power supply system network.

[0006] On one side of the detection test bench, there are three power input ports, namely the first AC input port, the second AC input port and a DC input port. On the other side of the detection test bench, there are four power output ports, namely the first AC output port, the second AC output port, the third AC output port and the fourth AC output port. A first circuit breaker and a first AC contactor are connected in series between the first AC input port and the first AC output port to form a first AC circuit. The second AC input terminal is connected to the second AC output port, the third AC output port and the fourth AC output port respectively through a three-phase busbar, a second AC contactor, a third AC contactor and a positive phase sequence AC contactor to form a second AC circuit. The DC input port provides power for all the contactors in the detection test bench, and the DC input port controls the working power of all the contactors through a main switch.

[0007] In the second AC circuit, a current conversion circuit is connected in series between the second AC input terminal and the three-phase busbar. The current conversion of this current conversion circuit is controlled by a current conversion switch and a reverse phase sequence interlock relay. This current conversion circuit includes two parallel current paths. One current path contains a rated circuit breaker and a rated contactor, and the other current path contains a short-circuit-proof circuit breaker and a short-circuit-proof contactor.

[0008] In the second AC circuit, a reverse phase sequence circuit is connected in series between the second AC input terminal and the fourth AC output port. This reverse phase sequence circuit contains a reverse phase sequence circuit breaker and a reverse phase sequence contactor. The reverse phase sequence contactor is controlled by a positive and reverse phase sequence conversion switch and a positive phase sequence interlock relay.

[0009] On the shell of the detection test bench, there is also a control panel and a display panel. On the control panel, there are control switches for the first AC contactor, the second AC contactor and the third AC contactor, the positive and reverse phase sequence conversion switch for the positive and reverse phase sequence AC contactor, the power supply current conversion switch and signal lights. On the display panel, there are a voltmeter for the ground AC power supply, a band switch and signal lights.

[0010] A detection method for the network power supply of an aircraft AC power system, characterized by including the following steps: 1) Using the detection system for the network power supply of the aircraft AC power system described above; 2) Connecting the first AC input port and the second AC input port of the detection test bench to a ground AC power supply respectively, and connecting the DC input port to a ground DC power supply; 3) Connecting the first AC output port of the detection test bench to the feeder line of the right generator on the aircraft, the second AC output port to the feeder line of the left generator on the aircraft, the third AC output port to the feeder line of the auxiliary generator on the aircraft, and the fourth AC output port to the ground AC power socket on the aircraft; 4) During detection, first turn on the first AC circuit through the control switch of the first AC contactor on the control panel to simulate the operation of the right generator, and detect the power supply and operating status of the right generator to the aircraft AC power system network; 5) Before turning on the second AC circuit, set the current conversion switch to the short-circuit prevention position through the control panel, then turn on the control switches of the second AC contactor and the third AC contactor, and turn on the positive and negative phase sequence conversion switch to the positive phase sequence position to simulate the operation of the left generator and the auxiliary generator and the operation of the ground AC power socket, and detect whether the left generator, the auxiliary generator and the ground AC power socket are operating normally. After the left generator, the auxiliary generator and the ground AC power supply are operating normally, then set the current conversion switch to the rated position and detect the power supply and operating status of the aircraft AC power system network; 6) Turn on the positive and negative phase sequence conversion switch to the positive phase sequence position through the control panel to provide positive phase sequence alternating current for the ground AC power socket, and detect the positive phase sequence power supply and operating status of the aircraft AC power system network; 7) After the detection of the power supply and operating status of the aircraft AC power system network is completed, set the current conversion switch to the neutral position through the control panel, and turn on the positive and negative phase sequence conversion switch to the negative phase sequence position to detect whether the reverse phase sequence monitoring function of the aircraft ground AC power supply is normal.

[0011] The advantages of this application lie in designing a detection test bench in combination with the actual needs of the initial power supply of the aircraft AC power system network: 1) By changing the two-way input of the ground AC power into four-way output, the parallel power supply of the left and right generators is realized, and the utilization rate of the equipment is improved; 2) By setting 10A circuit breakers on the first AC power input circuit and the second AC power input circuit, short-circuit protection for the on-board circuits and equipment during the initial power supply of the aircraft is achieved; 3) When a dangerous situation occurs, all AC power supplies supplying power to the aircraft AC power system network port can be quickly disconnected through the main switch; 4) Through the positive and negative phase sequence conversion switch, the automatic conversion of the positive and negative phase sequences of the ground AC power supply circuit can be conveniently realized. 5) Through the relay interlocking circuit, it is possible to prevent short circuits between different phases of the AC power caused by misoperation of the reverse phase sequence (or positive phase sequence) switch during positive phase sequence (or reverse phase sequence) power supply. This detection test bench is simple to operate, safe and reliable, eliminates the risk of operation errors existing in traditional test methods, and reduces the working intensity of operators. The design idea of this invention is novel, easy to implement, and widely applicable. It can provide technical solutions for aviation manufacturing, promote the development of the power supply detection technology of the aircraft final assembly AC power network, and has innovation, extremely high application value and promotion potential.

[0012] The following further describes this application in detail with reference to the accompanying drawings of the embodiments.

[0013] Explanation of the drawings in the specification

[0014] Figure 1 Schematic diagram of the connection of a detection system for the power supply of an aircraft AC power system network;

[0015] Figure 2 Schematic diagram of the principle of the detection test bench;

[0016] Figure 3 Schematic diagram of the input display panel of the detection test bench;

[0017] Figure 4 Schematic diagram of the control panel of the detection test bench;

[0018] Figure 5 Schematic diagram of the first AC circuit of the detection test bench;

[0019] Figure 6 Schematic diagram of the second AC conversion circuit of the detection test bench;

[0020] Figure 7 Schematic diagram of the second AC output circuit of the detection test bench;

[0021] Figure 8 Schematic diagram of the second AC positive and negative phase sequence conversion and interlocking circuit of the detection test bench;

[0022] Figure 9 Schematic diagram of the emergency power-off circuit of the detection test bench;

[0023] Figure 10 Schematic diagram of the input indication circuit of the detection test bench;

[0024] Figure 11 Schematic diagram of the output indication circuit of the detection test bench;

[0025] Figure 12 Schematic diagram of the circuit of the detection test bench;

[0026] Description of the numbers in the figure: 1. First ground AC power supply; 2. Second ground AC power supply; 3. Ground DC power supply; 4. Detection test bench; 5. Right generator; 6. Left generator; 7. Auxiliary generator; 8. Ground AC power socket; 9. First AC input port; 10. First circuit breaker; 11. First AC contactor; 12. First AC output port; 13. Second AC input port; 14. Rated circuit breaker; 15. Rated contactor; 16. Three-phase busbar; 17. Short-circuit prevention circuit breaker; 18. Short-circuit prevention contactor; 19. Second AC contactor; 20. Second AC output port; 21. Third AC contactor; 22. Third AC output port; 23. Positive-sequence AC contactor; 24. Fourth AC output port; 25. Reverse-sequence circuit breaker; 26. Reverse-sequence contactor; 27. DC input port; 28. Display panel; 29. Control panel; 30. First AC contactor control switch; 31. Current conversion switch; 32. Second AC contactor control switch; 33. Third AC contactor control switch; 34. Positive / negative sequence conversion switch; 35. Main switch; 36. Reverse-sequence interlock relay; 37. Positive-sequence interlock relay; 38. First AC input voltmeter fuse; 39. First AC input band switch; 40. First AC input signal lamp; 41. First AC input voltmeter; 42. DC signal lamp; 43. Second AC output signal lamp; 44. Positive-sequence AC output signal lamp; 45. Reverse-sequence AC output signal lamp; 46. Positive / negative sequence signal lamp conversion relay; 47. Second AC input voltmeter fuse; 48. Second AC input band switch; 49. Second AC input signal lamp; 50. Second AC input voltmeter; 51. First AC output signal lamp; 52. Third AC output signal lamp; Detailed implementation method

[0027] See Figure 1, the detection system for the network power supply of the aircraft AC power supply system of the present application. The aircraft AC power supply system network is provided with AC power by the on-board right generator 5 and left generator 6, auxiliary AC power by the on-board auxiliary generator 7, and ground maintenance power by the ground AC power socket 8. The detection system includes a detection test bench 4, two ground AC power supplies 1 and 2, and one ground DC power supply 3. The two ground AC power supplies 1 and 2 and the one ground DC power supply 3 are connected to the power input ports of the detection test bench 4, and the output ports of the detection test bench 4 are connected to the aircraft AC power supply system network to provide detection power for the aircraft AC power supply system network.

[0028] The principle of the detection test bench is as Figure 2 shown. There are three power input ports on one side of the detection test bench, the first AC input port 9, the second AC input port 13, and one DC input port 27. There are four power output ports on the other side of the detection test bench, the first AC output port 12, the second AC output port 20, the third AC output port 22, and the fourth AC output port 24. A first circuit breaker 10 and a first AC contactor 11 are connected in series between the first AC input port 9 and the first AC output port 12 to form a first AC circuit.

[0029] The second AC input port 13 is connected to the second AC output port 20, the third AC output port 22, and the fourth AC output port 24 respectively through a three-phase busbar 16, a second AC contactor 19, a third AC contactor 21, and a positive sequence AC contactor 23 to form a second AC circuit.

[0030] The DC input port 27 provides power for the operation of all contactors in the detection test bench, and the DC input port 27 controls the power supply for the operation of all contactors through a main switch 35.

[0031] The first AC circuit of the detection test bench is shown in the appendix Figure 5 . By turning on the first AC contactor control switch 30 through the detection test bench control panel 29, the first AC contactor 11 in the detection test bench operates, and the alternating current input from the first AC input port 9 of the detection test bench 4 is output to the first AC output port 12 of the detection test bench 4 through the first circuit breaker 10 and the first AC contactor 11. In the embodiment, the first AC contactor control switch 30 is selected with the model MJK-2, the first AC contactor 11 is selected with the model HJJ-10, the first AC input port 9 is selected with the model PJ-500AB, and the first circuit breaker 10 is selected with the model DBG-10.

[0032] The second AC conversion circuit of the detection test bench is shown in the appendix Figure 6。Between the second AC input port 13 (model PJ-500AB selected) of the detection test bench 4 and the three-phase busbar 16 inside the test bench, two parallel power supply paths are set up. One is the short-circuit prevention path with a rated current of 10 amperes; the other is the rated path with a rated current of 50 amperes. The selection of the current path is achieved by setting the corresponding position of the current conversion switch 31 (model MLK-3 selected) on the control panel of the detection test bench to make the short-circuit prevention contactor 18 (model HJJ-10 selected) and the rated contactor 15 (model HJJ-100 selected) work. The current conversion switch 31 is a single-pole conversion switch with a neutral disconnect position, which can ensure the uniqueness of the current path selection. When the current conversion switch 31 is set in the short-circuit prevention position, the short-circuit prevention contactor 18 works, and the alternating current input from the second AC input port 13 is transmitted to the three-phase busbar 16 inside the detection test bench 4 through the short-circuit prevention circuit breaker 17 (model DBG-10 selected) and the short-circuit prevention contactor 18; when the current conversion switch 31 is set in the rated position, the rated contactor 15 works, and the alternating current input from the second AC input port 13 is transmitted to the three-phase busbar 16 inside the detection test bench 4 through the rated circuit breaker 14 (model SDB-A50 selected) and the rated contactor 15.

[0033] For the second AC output circuit of the detection test bench, see the appendix Figure 7 。By turning on the control switch 32 of the second AC contactor (model MJK-2 selected) through the control panel of the detection test bench, the second AC contactor 19 (model HJJ-10 selected) of the detection test bench works, and the alternating current on the three-phase busbar 16 inside the detection test bench 4 is transmitted to the second AC output port 20 of the detection test bench 4 through the second AC contactor 19.

[0034] By turning on the control switch 33 of the third AC contactor (model MJK-2 selected) through the control panel of the detection test bench, the third AC contactor 21 (model HJJ-10 selected) inside the detection test bench works, and the alternating current on the three-phase busbar 16 inside the detection test bench is transmitted to the third AC output port 22 of the detection test bench 4 through the third AC contactor 21.

[0035] By setting the positive and negative phase sequence conversion switch 34 (model MLK-3 selected) on the control panel of the detection test bench to the positive phase sequence position, the positive phase sequence AC contactor 23 (model HJJ-100 selected) inside the detection control test bench works, and the alternating current on the three-phase busbar 16 inside the detection test bench is transmitted to the fourth AC output port 24 of the detection test bench 4 through the positive phase sequence AC contactor 23.

[0036] For the second AC positive and negative phase sequence conversion and interlock circuit of the detection test bench, see the appendix Figure 8According to the inspection requirements of the aircraft AC power supply system network: when supplying reverse-phase AC power to the aircraft ground AC power socket 8, the reverse-phase power supply should not be connected to the aircraft AC power supply system network. To verify the correctness of the reverse-phase sequence monitoring circuit function of the aircraft ground AC power socket 8, it is necessary to supply reverse-phase AC power to the aircraft ground AC power socket 8. Set up an automatic conversion circuit in the test bench 4. Through the test bench control panel, set the forward and reverse phase sequence conversion switch 34 to the reverse-phase position, so that the reverse-phase sequence contactor 26 (model HJJ-10 selected) in the test bench 4 works. The positive-phase AC power input from the second AC input port 13 becomes reverse-phase AC power after passing through the reverse-phase sequence circuit breaker 25 (model DBG-5 selected) and the reverse-phase sequence contactor 26, and is output to the fourth AC output port 24 of the test bench 4. Through the fourth AC output port 24 and the process cable, it is output to the ground AC power socket 8 on the aircraft. Set a reverse-phase sequence circuit breaker 25 in the reverse-phase sequence path to protect the circuit. The rated current of this reverse-phase sequence circuit is 5A.

[0037] To prevent short circuits between different phases of the forward and reverse-phase AC power supplies when the second AC power supply supplies power in the forward or reverse phase sequence, the forward and reverse phase sequence working states should be set to interlock with each other, and their logical relationship is set to the first worker being prioritized. When the rated AC contactor 15 or the short-circuit prevention contactor 18 works, the reverse-phase sequence contactor 26 cannot work; when the forward and reverse phase sequence conversion switch 34 is set to the reverse-phase position, the rated AC contactor 15 and the short-circuit prevention contactor 18 cannot work. Therefore, the design idea of the circuit is to connect a reverse-phase sequence interlock relay 36 (model JKC-52B selected) in series between the main switch 35 (model MJK-2 selected) and the current conversion switch 31. The middle point circuit of the current conversion switch 31 passes through the normally closed contact of this relay. When the forward and reverse phase sequence conversion switch 34 is set to the reverse-phase position, the reverse-phase sequence interlock relay 36 works, cutting off the working coil circuits of the short-circuit prevention contactor 18 and the rated contactor 15; at the same time, connect a positive-phase sequence interlock relay 37 (model JZM-52 selected) in series between the reverse-phase position of the forward and reverse phase sequence conversion switch 34 and the coil of the reverse-phase sequence contactor 26. The coil circuit of the reverse-phase sequence contactor 26 passes through the normally closed contact of this positive-phase sequence interlock relay 37. When the rated AC contactor 15 or the short-circuit prevention contactor 18 works, phase A of the three-phase busbar 16 makes this positive-phase sequence interlock relay 37 work, cutting off the coil circuit of the reverse-phase sequence contactor 26.

[0038] For the emergency power-off circuit of the test bench, see Appendix Figure 9

[0039] When a dangerous situation occurs during the power supply process of the aircraft, in order to quickly cut off the power emergently, the first AC contactor control switch 30, the second AC contactor control switch 32, the third AC contactor control switch 33, the current conversion switch 31, and the forward and reverse phase sequence conversion switch 34 in the detection test bench 4 are all connected to a main switch 35. After that, all operation switches are controlled by the main switch. When a dangerous situation occurs, disconnecting this switch can cut off the alternating current supplied to the aircraft through all the circuits on the test bench, that is, the function of quickly cutting off the power.

[0040] For the input indication circuit diagram of the detection test bench, see the appendix Figure 10

[0041] To observe the working state of the input power supply, a first AC band switch 39 (model PZK-1 selected), a first AC signal lamp 40, and a first AC voltmeter 41 (model BVJ-2A selected) are set at the entrance of the first AC input port 9 in the detection test bench 4. When the first ground AC power supply works, the first AC signal lamp 40 lights up. Rotate the first AC band switch 39 to select phases A, B, and C, and the first AC voltmeter 41 indicates the corresponding phase voltage value. First AC voltmeter fuses 38 (model TB-2 selected) are respectively set on the A, B, and C phase circuits of the first AC band switch 39 to protect each phase measurement circuit. The input indication circuits of the first AC input port 9 and the second AC input port 13 are the same. The appendix Figure 10 uses the indication circuit of the first AC input port 9 as an example for explanation.

[0042] To observe the working state of the DC control power supply, a DC signal lamp 42 (model ZSD-1 selected) is set after the main switch 35. When the main switch 35 is turned on, the DC signal lamp 42 lights up.

[0043] For the output indication circuit diagram of the detection test bench, see the appendix Figure 11

[0044] To indicate the power supply states of the first AC output port 12, the second AC output port 20, and the third AC output port 22, AC signal lamps 51, 43, and 52 are respectively set corresponding to the above AC output ports. When there is alternating current at the above AC output ports, the corresponding AC signal lamps light up. The indication circuits of the first AC output port 12, the second AC output port 20, and the third AC output port 22 are the same. The appendix Figure 11 uses the second AC output port 20 as an example for explanation.

[0045] The fourth AC output port 24 has two power supply states: positive phase sequence and negative phase sequence. The conversion of the signal lamp circuits in these two states is achieved by the operation of the positive / negative phase sequence signal lamp conversion relay 46 (model JKC-S2B selected). When the power supply is in the positive phase sequence, the positive / negative phase sequence signal lamp conversion relay 46 does not operate, causing the positive phase sequence signal lamp 44 to light up; when the power supply is in the negative phase sequence, the positive / negative phase sequence signal lamp conversion relay 46 operates, causing the negative phase sequence signal lamp 45 to light up.

[0046] For the circuit of the detection test bench, see the appendix Figure 12 。Working principle of the detection test bench: Connect the first and second ground AC power supplies. The first AC input signal lamp 40 lights up, and the second AC input signal lamp 49 lights up. Rotate the A, B, and C phase positions of the first AC input band switch 39, and the first AC input voltmeter 41 shows the voltages of phases A, B, and C respectively. Rotate the A, B, and C phase positions of the second AC input band switch 48 (model PZK-1 selected), and the second AC input voltmeter 50 (model BVJ-2A selected) shows the voltages of phases A, B, and C respectively. Turn on the main switch 35, and the DC signal lamp 42 lights up. Turn on the first circuit breaker 10, and then turn on the control switch 30 of the first AC contactor to make the first AC contactor 11 operate. The first AC output signal lamp 51 lights up, and there is alternating current at the first AC output port 12. Turn on the anti-short circuit breaker 17 and the rated circuit breaker 14, connect the current conversion switch 31 to the anti-short circuit position, make the anti-short circuit contactor 18 operate, and the anti-short circuit input path works. There is alternating current in the A, B, and C phase busbars of the three-phase busbar 16 in the detection test bench in the anti-short circuit working state. At this time, the alternating current output to the second AC output port 20, the third AC output port 22, and the fourth AC output port 24 will work in the anti-short circuit state. Connect the current conversion switch 31 to the neutral position, and then connect it to the rated position to make the rated contactor 15 operate and the rated input path work. There is alternating current in the A, B, and C phase busbars of the three-phase busbar 16 in the detection test bench in the rated working state. At this time, the alternating current output to the second AC output port 20, the third AC output port 22, and the fourth AC output port 24 will work in the rated state.

[0047] After the rated or anti-short circuit path of the second AC circuit works, if the control switch 32 of the second AC contactor is turned on again to make the second AC contactor 19 operate, the second AC output signal lamp 43 lights up, and there is alternating current at the second AC output port 20; if the control switch 33 of the third AC contactor is turned on again to make the third AC contactor 21 operate, the third AC output signal lamp 52 lights up, and there is alternating current at the third AC output port 22; if the positive / negative phase sequence conversion switch 34 is connected to the positive phase sequence position to make the positive phase sequence AC contactor 23 operate, the positive phase sequence AC output signal lamp 44 lights up, and there is alternating current with positive phase sequence at the fourth AC output port 24.

[0048] After the rated or short-circuit-proof path of the second AC circuit operates, the A phase of the three-phase busbar 16 in the test bench supplies power to the coil of the positive phase sequence interlocking relay 37, causing the positive phase sequence interlocking relay 37 to operate. Its normally closed contact opens, cutting off the circuit of the reverse phase sequence contactor 26 coil from the reverse phase sequence position of the forward and reverse phase sequence changeover switch 34. At this time, if the reverse phase sequence changeover switch 34 is then connected to the reverse phase sequence position again, the reverse phase sequence contactor 26 will not operate, and the reverse phase sequence alternating current will not be output to the fourth AC output port 24. After the operation, the forward and reverse phase sequence changeover switch 34 should be connected to the neutral position again.

[0049] Before supplying reverse phase sequence power, the current changeover switch 31 should first be connected to the neutral position, and then the forward and reverse phase sequence changeover switch 34 should be connected to the reverse phase sequence position, causing the reverse phase sequence contactor 26, the reverse phase sequence interlocking relay 36, and the forward / reverse phase sequence signal lamp changeover relay 46 to operate. At this time, the reverse phase sequence AC output signal lamp 45 lights up, and there is reverse phase sequence alternating current at the fourth AC output port 24. After the reverse phase sequence interlocking relay 36 operates, its normally closed contact opens, cutting off the circuit between the main switch 35 and the intermediate position of the current changeover switch 31. At this time, if the current changeover switch 31 is then connected to the short-circuit-proof position or the rated position, the short-circuit-proof contactor 18 and the rated contactor 15 will not operate, and the positive phase sequence alternating current will not be output to the three-phase busbar 16. At the same time, after the reverse phase sequence interlocking relay 36 operates, its normally closed contact also opens, cutting off the circuits of the first AC contactor control switch 30, the second AC contactor control switch 32, and the third AC contactor control switch 33. At this time, if these switches are then turned on again, the first AC contactor 11, the second AC contactor 19, and the third AC contactor 21 will not operate.

Claims

1. A detection system for network power supply of an aircraft alternating current power supply system. The aircraft alternating current power supply system network provides alternating current power by the on-board right generator (5) and left generator (6), provides auxiliary alternating current power by the on-board auxiliary generator (7), and provides ground maintenance power by the ground alternating current power socket (8). It is characterized in that, The detection system includes a detection test bench (4), two ground AC power supplies (1), (2) and one ground DC power supply (3). The two ground AC power supplies (1), (2) and one ground DC power supply (3) are connected to the power input ports of the detection test bench (4). The output ports of the detection test bench (4) are connected to the aircraft AC power system network to provide detection power for the aircraft AC power system network. There are three power input ports on one side of the detection test bench, namely the first AC input port (9), the second AC input port (13) and one DC input port (27). There are four power output ports on the other side of the detection test bench, namely the first AC output port (12), the second AC output port (20), the third AC output port (22), and the fourth AC output port (24). A first circuit breaker (10) and a first AC contactor (11) are connected in series between the first AC input port (9) and the first AC output port (12) to form a first AC circuit. The second AC input port (13) is connected to the second AC output port (20), the third AC output port (22), and the fourth AC output port (24) respectively through a three-phase busbar (16), a second AC contactor (19), a third AC contactor (21), and a positive phase sequence AC contactor (23) to form a second AC circuit. The DC input port (27) provides power for all the contactors in the detection test bench, and the DC input port (27) controls the working power of all the contactors through a main switch (35).

2. The detection system for network power supply of the aircraft AC power supply system according to claim 1, characterized in that In the second AC circuit, a current conversion circuit is connected in series between the second AC input port (13) and the three-phase busbar (16). The conversion of this current conversion circuit is controlled by a current conversion switch (31) and a reverse phase sequence interlock relay (36). This current conversion circuit includes two parallel current paths. One current path contains a rated circuit breaker (14) and a rated contactor (15), and the other current path contains a short-circuit-proof circuit breaker (17) and a short-circuit-proof contactor (18).

3. The detection system for network power supply of the aircraft AC power supply system according to claim 1 or 2, characterized in that, In the second AC circuit, an anti-phase sequence circuit is connected in series between the second AC input port (13) and the fourth AC output port (24). This anti-phase sequence circuit contains an anti-phase sequence circuit breaker (25) and an anti-phase sequence contactor (26). The anti-phase sequence contactor (26) is controlled by a positive and reverse phase sequence conversion switch (34) and a positive phase sequence interlock relay (37).

4. The detection system for network power supply of the aircraft AC power supply system according to claim 3, characterized in that, On the housing of the detection test bench (4), there is also provided a control panel (29) and a display panel (28). On the control panel (29), there are a main switch (35) and a DC signal lamp (42), a current conversion switch (31) for controlling the short-circuit prevention contactor (18) and the rated contactor (15), a control switch (30) of the first AC contactor and a first AC output signal lamp (51), a control switch (32) of the second AC contactor and a second AC output signal lamp (43), a control switch (33) of the third AC contactor and a third AC output signal lamp (52), a positive and negative phase sequence conversion switch (34) for controlling the positive phase sequence AC contactor (23) and the negative phase sequence contactor (26), and a positive phase sequence AC output signal lamp (44) and a negative phase sequence AC output signal lamp (45). On the display panel, there are a first AC input band switch (39), a second AC input band switch (48), a first AC input signal lamp (40), a second AC input signal lamp (49), a first AC input voltmeter (41), and a second AC input voltmeter (50).

5. A detection method for network power supply of an aircraft AC power system, characterized in that It includes the following: 1) A detection system powered by the aircraft AC power system network described in claim 1 or 2 or 3 or 4; 2) Connect the first AC input port (9) and the second AC input port (13) of the detection test bench (4) to a ground AC power supply (1), (2) respectively, and connect the DC input port (27) to a ground DC power supply (3); 3) Connect the first AC output port (12) of the detection test bench (4) to the feeder line of the right generator (5) on the aircraft, the second AC output port (20) to the feeder line of the left generator (6) on the aircraft, the third AC output port (22) to the feeder line of the auxiliary generator (7) on the aircraft, and the fourth AC output port (24) to the ground AC power socket (8) on the aircraft; 4) During detection, first turn on the first AC circuit through the control switch (30) of the first AC contactor on the control panel (29) to simulate the operation of the right generator (5), and detect the power supply and operating status of the right generator (5) to the aircraft AC power system network; 5) Before turning on the second AC circuit, set the current conversion switch (31) to the short-circuit prevention position through the control panel (29), then turn on the control switch (32) of the second AC contactor, the control switch (33) of the third AC contactor, and turn on the positive and negative phase sequence conversion switch (34) to the positive phase sequence position to simulate the operation of the left generator (6) and the auxiliary generator (7) and the operation of the ground AC power socket (8), and detect whether the left generator (6), the auxiliary generator (7), and the ground AC power socket (8) are operating normally. After the left generator (6), the auxiliary generator (7), and the ground AC power socket (8) are operating normally, set the current conversion switch (31) to the rated position and detect the power supply and operating status of the aircraft AC power system network; 6) Turn on the positive and negative phase sequence conversion switch (34) to the positive phase sequence position through the control panel (29) to provide positive phase sequence alternating current for the ground AC power socket (8), and detect the positive phase sequence power supply and operating status of the aircraft AC power system network; 7) After the detection of the power supply and operating status of the aircraft AC power system network is completed, set the current conversion switch (31) to the neutral position through the control panel, and then turn on the positive and negative phase sequence conversion switch (34) to the reverse phase sequence position to detect whether the reverse phase sequence monitoring function of the aircraft ground AC power socket (8) is normal.

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