Dual-power-supply automatic switching system applied to alternating-current motor

Abstract

The utility model discloses a dual-power-supply automatic switching system applied to an alternating-current motor, and relates to the technical field of industrial power supply switching, and the method comprises the steps that the input end of a first power supply circuit is connected with a first three-phase power supply, and the output end of the first power supply circuit is connected with the first input end of an automatic switching circuit; the input end of the second power supply circuit is connected with a second three-phase power supply, and the output end of the second power supply circuit is connected with the second input end of the automatic switching circuit; the output end of the automatic switching circuit is connected with the alternating-current motor; and the automatic switching circuit is used for automatically switching to the other power supply circuit when any one of the first power supply circuit and the second power supply circuit fails. According to the invention, real-time seamless switching can be automatically carried out on the two power supplies of the AC motor, the power supply switching efficiency of the AC motor is improved, and the power supply reliability of the AC motor is enhanced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of industrial power switching, in particular to a dual-power automatic switching system applied to an alternating-current motor. BACKGROUND

[0002] At present, in an industrial control process, power supply of an alternating-current motor is mostly in a two-way power supply mode, when one-way power supply fails, another way of power supply can be started to ensure the needs of industrial production.

[0003] However, the power supply switching process of the alternating-current motor mostly adopts manual switching, the power supply circuit of the failure is manually disconnected, and then another power supply circuit is manually started, in the process, the alternating-current motor will lose power, and there is a time delay in connecting another power supply, so that real-time seamless switching of the two-way power supply cannot be realized, the power supply switching efficiency is low, and the reliability of the power supply of the alternating-current motor is poor. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a dual-power automatic switching system applied to an alternating-current motor, which can automatically realize real-time seamless switching of two-way power supply of the alternating-current motor, improve the power supply switching efficiency of the alternating-current motor, and enhance the reliability of the power supply of the alternating-current motor.

[0005] To achieve the above-mentioned purpose, the application provides the following solutions.

[0006] The application provides a dual-power automatic switching system applied to an alternating-current motor, which is connected with a first three-phase power supply, a second three-phase power supply and the alternating-current motor respectively, and comprises a first power supply circuit, a second power supply circuit, an automatic switching circuit and a power supply driving circuit; an input end of the first power supply circuit is connected with the first three-phase power supply, and an output end of the first power supply circuit is connected with a first input end of the automatic switching circuit; an input end of the second power supply circuit is connected with the second three-phase power supply, and an output end of the second power supply circuit is connected with a second input end of the automatic switching circuit; an output end of the automatic switching circuit is connected with the alternating-current motor; and the automatic switching circuit is used for automatically switching to another way of power supply when any one of the first power supply circuit or the second power supply circuit fails.

[0007] According to the specific embodiments provided by the application, the following technical effects are disclosed.

[0008] The application controls the first power supply circuit and the second power supply circuit through the automatic switching circuit, automatically switches to another way of power supply when any one of the first power supply circuit or the second power supply circuit fails, can automatically realize real-time seamless switching of two-way power supply of the alternating-current motor, improves the power supply switching efficiency of the alternating-current motor, and enhances the reliability of the power supply of the alternating-current motor. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a circuit diagram of a dual-power automatic switching system for AC motors, provided as an embodiment of this application.

[0011] Figure 2 The circuit diagram for manual dual power supply switching provided in the embodiments of this application is shown.

[0012] Figure label:

[0013] First power supply circuit-1; Second power supply circuit-2; Automatic switching circuit-3; Power drive circuit-4; First intermediate relay-KA1; Second intermediate relay-KA2; First contactor-KM1; Second contactor-KM2; Third contactor-KM3; First circuit breaker-KM1; Second circuit breaker-KM2; Third circuit breaker-KM3; First phase sequence detection device-KQ1; Second phase sequence detection device-KQ2; First two-position switch-KK1, Second two-position switch-KK2 and AC motor-M1. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Example 1, such as Figure 1 As shown, this embodiment provides a dual-power automatic switching system for an AC motor M1, which is connected to a first three-phase power supply, a second three-phase power supply, and the AC motor M1. The dual-power automatic switching system for the AC motor M1 includes: a first power supply circuit 1, a second power supply circuit 2, an automatic switching circuit 3, and a power drive circuit 4.

[0017] The input end of the first power supply circuit 1 is connected with the first three-phase power supply, and the output end of the first power supply circuit 1 is connected with the first input end of the automatic switching circuit 3.

[0018] The input end of the second power supply circuit 2 is connected with the second three-phase power supply, and the output end of the second power supply circuit 2 is connected with the second input end of the automatic switching circuit 3.

[0019] The output end of the automatic switching circuit 3 is connected with the alternating current motor M1; the automatic switching circuit 3 is used for automatically switching to another power supply when any one of the first power supply circuit 1 or the second power supply circuit 2 fails.

[0020] Further, the automatic switching circuit 3 specifically comprises: a first intermediate relay KA1, a second intermediate relay KA2, a first contactor KM1 and a second contactor KM2.

[0021] The input end of the main contact of the first contactor KM1 is connected with the output end of the first power supply circuit 1, and the output end of the main contact of the first contactor KM1 is connected with the power supply driving circuit 4.

[0022] The normally closed contact of the second intermediate relay KA2, the normally open contact of the first contactor KM1 and the A1 end of the coil of the first intermediate relay KA1 are all connected with the first target firewire of the output end of the first power supply circuit 1, and the A2 end of the coil of the first intermediate relay KA1 is respectively connected with the zero line of the output end of the first power supply circuit 1 and the zero line of the output end of the second power supply circuit 2.

[0023] The normally closed contact of the second contactor KM2 is respectively connected with the normally closed contact of the second intermediate relay KA2 and the normally open contact of the first contactor KM1.

[0024] The A1 end of the coil of the first contactor KM1 is connected with the normally closed contact of the second contactor KM2, and the A2 end of the coil of the first contactor KM1 is respectively connected with the zero line of the output end of the first power supply circuit 1 and the zero line of the output end of the second power supply circuit 2.

[0025] The input end of the main contact of the second contactor KM2 is connected with the output end of the second power supply circuit 2, and the output end of the main contact of the second contactor KM2 is connected with the power supply driving circuit 4.

[0026] The normally closed contact of the first intermediate relay KA1, the normally closed contact of the first intermediate relay KA1 and the normally open contact of the second contactor KM2 are all connected with the first target firewire of the output end of the second power supply circuit 2; the first target firewire is any one of the firewire of the output end of the first power supply circuit 1 and the output end of the second power supply circuit 2.

[0027] The A1 end of the coil of the second intermediate relay KA2 is connected with the normally closed contact of the second contactor KM2, and the A2 end of the coil of the first intermediate relay KA1 is connected with the zero line of the output end of the first power supply circuit 1 and the zero line of the output end of the second power supply circuit 2 respectively.

[0028] The normally closed contact of the first contactor KM1 is connected with the normally closed contact of the first intermediate relay KA1 and the normally open contact of the second contactor KM2 respectively.

[0029] The A1 end of the coil of the second contactor KM2 is connected with the normally closed contact of the first contactor KM1, and the A2 end of the coil of the second contactor KM2 is connected with the zero line of the output end of the first power supply circuit 1 and the zero line of the output end of the second power supply circuit 2 respectively.

[0030] Further, the automatic switching circuit 3 further comprises: a first two-position switching switch and a second two-position switching switch.

[0031] One end of the first two-position switching switch is connected with the first target fire line of the output end of the first power supply circuit 1, and the other end of the first two-position switching switch is connected with the normally closed contact of the first intermediate relay KA1 and the normally open contact of the second contactor KM2 respectively.

[0032] One end of the second two-position switching switch is connected with the first target fire line of the output end of the second power supply circuit 2, and the other end of the second two-position switching switch is connected with the normally closed contact of the second intermediate relay KA2 and the normally open contact of the second contactor KM2 respectively.

[0033] Further, the model of the first two-position switching switch KK1 or the second two-position switching switch KK2 is XB2BD25C.

[0034] Optionally, the first two-position switching switch KK1 or the second two-position switching switch KK2 is provided with two positions of on and off; the first two-position switching switch KK1 or the second two-position switching switch KK2 is used for controlling the start and stop of the dual-power automatic switching system applied to the alternating current motor M1.

[0035] Optionally, the first contactor KM1 or the second contactor KM2 is a 220V contactor using a 220V alternating current coil; the third contactor KM3 is a 380V contactor using a 380V alternating current coil.

[0036] Further, the model of the first intermediate relay KA1 or the second intermediate relay KA2 is CDZ9-62P.

[0037] Further, the first power supply circuit 1 specifically comprises: a first circuit breaker KM1.

[0038] The main contact input end of the first circuit breaker KM1 is connected with the first three-phase power supply, and the main contact output end of the first circuit breaker KM1 is connected with the first input end of the automatic switching circuit 3.

[0039] Further, the first power supply circuit 1 further comprises a first phase sequence detection device KQ1.

[0040] The input end of the main contact of the first phase sequence detection device KQ1 is connected with the output end of the main contact of the first circuit breaker KM1, and the output end of the first phase sequence detection device KQ1 is connected with the first input end of the automatic switching circuit 3.

[0041] One end of the normally open contact of the first phase sequence detection device KQ1 is connected with the first target firewire end of the first circuit breaker KM1, and the other end of the normally open contact of the first phase sequence detection device KQ1 is connected with the first input end of the automatic switching circuit 3; the first phase sequence detection device KQ1 is used for detecting the phase sequence of the first power supply circuit 1, and when the phase sequence of the first power supply circuit 1 is correct, the normally open contact of the first phase sequence detection device KQ1 is closed.

[0042] Further, the second power supply circuit 2 specifically comprises a second circuit breaker KM2.

[0043] The main contact input end of the second circuit breaker KM2 is connected with the second three-phase power supply, and the main contact output end of the second circuit breaker KM2 is connected with the second input end of the automatic switching circuit 3.

[0044] Further, the second power supply circuit 2 further comprises a second phase sequence detection device KQ2.

[0045] The input end of the main contact of the second phase sequence detection device KQ2 is connected with the output end of the main contact of the second circuit breaker KM2, and the output end of the second phase sequence detection device KQ2 is connected with the second input end of the automatic switching circuit 3.

[0046] One end of the normally open contact of the second phase sequence detection device KQ2 is connected with the first target firewire end of the second circuit breaker KM2, and the other end of the normally open contact of the second phase sequence detection device KQ2 is connected with the second input end of the automatic switching circuit 3; the second phase sequence detection device KQ2 is used for detecting the phase sequence of the second power supply circuit 2, and when the phase sequence of the second power supply circuit 2 is correct, the normally open contact of the second phase sequence detection device KQ2 is closed.

[0047] Optionally, the first circuit breaker KM1 and the second circuit breaker KM2 are used for overload protection and short circuit protection.

[0048] Further, the power supply driving circuit 4 specifically comprises a third contactor KM3 and a third circuit breaker KM3.

[0049] The input end of the main contact of the third contact KM3 is connected with the output end of the first power supply circuit 1 and the output end of the second power supply circuit 2 respectively, and the output end of the main contact of the third contact KM3 is connected with the input end of the main contact of the third circuit breaker KM3.

[0050] The output end of the main contact of the third circuit breaker KM3 is connected with the alternating current motor M1.

[0051] The A1 end of the coil of the third contact KM3 is connected with the second target fire line of the output end of the second power supply circuit 2, and the A2 end of the coil of the third contact KM3 is connected with the third target fire line of the output end of the second power supply circuit 2; the second target fire line is any fire line of the output end of the first power supply circuit 1 and the output end of the second power supply circuit 2; the third target fire line is any fire line of the output end of the first power supply circuit 1 and the output end of the second power supply circuit 2 except the second target fire line.

[0052] Optionally, the model of the first phase sequence detection device KQ1 or the second phase sequence detection device KQ2 is RM22TG20.

[0053] Optionally, the third circuit breaker KM3 is used for overload protection.

[0054] As shown in the figure, Figure 2 When the first three-phase power supply is lost during the manual power supply circuit switching process, the first circuit breaker KM1 is manually opened, the second circuit breaker KM2 is closed, and the second three-phase power supply is switched to. When the first three-phase power supply is restored, the second circuit breaker KM2 is manually opened, the first circuit breaker KM1 is closed, and the first three-phase power supply is switched to. This process is tedious, has a large delay, and affects normal industrial production.

[0055] In actual application, the actual operation process of the dual-power automatic switching system applied to the alternating current motor M1 is as follows:

[0056] S1. When the first circuit breaker KM1 and the second circuit breaker KM2 are closed, the first phase sequence detection device KQ1 and the second phase sequence detection device KQ2 are powered, and the first phase sequence detection device KQ1 and the second phase sequence detection device KQ2 detect that the phase sequence of the two power supplies (the first three-phase power supply and the second three-phase power supply) from the low-voltage distribution room is correct, and the normally open contact of the first phase sequence detection device KQ1 and the second phase sequence detection device KQ2 is closed.

[0057] S2. After the normally open contact of the first phase sequence detection device KQ1 is closed, the coil of the first intermediate relay KA1 is powered, and the normally closed contact of the first intermediate relay KA1 connected with the coil of the second intermediate relay KA2 is opened.

[0058] S3. The normally open contact of the second phase sequence detector KQ2 is closed, and the normally closed contact of the first intermediate relay KA1 is opened, so the coil of the second intermediate relay KA2 cannot be energized.

[0059] S4. The first and second two-gear switches are both set to the on position, and the ① and ② terminals of the first and second two-gear switches are connected.

[0060] S5. The normally closed contact of the second intermediate relay KA2 is closed, and the normally closed contact of the second contactor KM2 is closed, so the coil of the first contactor KM1 is energized.

[0061] S6. The coil of the first contactor KM1 is energized, and the main circuit contact connected to the first contactor KM1 is closed, so the main circuit L1, L2, L3 (fire wire) is connected.

[0062] S7. The coil of the first contactor KM1 is energized, and the normally open contact of the first contactor KM1 connected in parallel with the normally closed contact of the second intermediate relay KA2 remains closed.

[0063] S8. When the L1, L2, L3 circuit is energized, the coil of the third contactor KM3 is energized and attracted, and the main contact connected to the AC motor M1 is closed. When the third contactor KM3 is closed, the AC motor M1 starts running.

[0064] S9. When the first three-phase power supply fails and loses power, the coil of the first intermediate relay KA1 loses power instantaneously, and the normally closed contact of the first contactor KM1 connected to the coil of the second intermediate relay KA2 will change from an open state to a closed state instantaneously, connecting the coil of the second intermediate relay KA2 and energizing the coil of the second intermediate relay KA2.

[0065] S10. After the coil of the first intermediate relay KA1 loses power, the normally closed contact connected to the second two-gear switch will change from an open state to a closed state instantaneously.

[0066] S11. After the first contactor KM1 loses power, the normally closed contact connected to the second contactor KM2 will change from an open state to a closed state instantaneously.

[0067] S12. After the normally closed contacts of the first intermediate relay KA1 and the first contactor KM1 are closed, the coil of the second contactor KM2 is energized.

[0068] S13. After the coil of the second contactor KM2 is energized, the main circuit contact connected to the second contactor KM2 is closed, and the main circuit L1, L2, L3 is connected.

[0069] S14. When the L1, L2, L3 line is electrified, the coil of the third contactor KM3 is electrified and attracted, and its main contact connected with the AC motor M1 is closed. When the third contactor KM3 is closed, the AC motor M1 starts to run.

[0070] Since the above action process is completed in an instant, the AC motor M1 will not stop rotating under naked eye observation.

[0071] S15. The normally closed contact of the first contactor KM1 is connected with the coil of the second contactor KM2, and the normally closed contact of the second contactor KM2 is connected with the coil of the first contactor KM1, which is to interlock and prevent the coils of the first contactor KM1 and the second contactor KM2 from being electrified at the same time, and at the same time, the first three-phase power supply and the second three-phase power supply are simultaneously sent to L1, L2, L3. Since the first three-phase power supply and the second three-phase power supply come from two transformers, it is strictly prohibited to close the loop of the two power supplies at the low-voltage side.

[0072] S16. When the first three-phase power supply is re-electrified, the first phase sequence detection device KQ1 detects no error, and its (the normally open contact of the first phase sequence detection device KQ1) normally open contact is closed, and the coil of the first intermediate relay KA1 is electrified. At this time, the normally closed contact of the first intermediate relay KA1 is closed to open, the second intermediate relay KA2 loses power, and L1, L2, L3 are re-powered by the first three-phase power supply.

[0073] The technical effects of the present application are as follows:

[0074] The present application controls the first power supply circuit and the second power supply circuit through the automatic switching circuit, and automatically switches to another power supply when any one of the first power supply circuit or the second power supply circuit fails, which can automatically switch the two power supplies of the AC motor in real time without interruption, improves the power switching efficiency of the AC motor, enhances the reliability of the AC motor power supply, and can ensure that the entire switching process is completed instantaneously, and the AC motor will not stop rotating.

[0075] All actions of obtaining signals, information or data in the present application are performed under the premise of complying with the corresponding data protection regulations and policies of the place, and with the authorization given by the owner of the corresponding device.

[0076] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0077] The principles and implementation manners of the present application are described herein by using specific examples, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will have changes. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A dual power automatic switching system applied to an alternating current motor, connected with a first three-phase power supply, a second three-phase power supply and an alternating current motor respectively, characterized in that, The dual power automatic switching system applied to the alternating current motor comprises a first power supply circuit, a second power supply circuit, an automatic switching circuit and a power supply driving circuit; The input end of the first power supply circuit is connected with the first three-phase power supply, and the output end of the first power supply circuit is connected with the first input end of the automatic switching circuit; The input end of the second power supply circuit is connected with the second three-phase power supply, and the output end of the second power supply circuit is connected with the second input end of the automatic switching circuit; The output end of the automatic switching circuit is connected with the alternating current motor; the automatic switching circuit is used for automatically switching to another power supply when any one of the first power supply circuit or the second power supply circuit fails.

2. The dual automatic transfer system for AC motor according to claim 1, wherein The automatic switching circuit specifically comprises a first intermediate relay, a second intermediate relay, a first contactor and a second contactor; The input end of the main contact of the first contactor is connected with the output end of the first power supply circuit, and the output end of the main contact of the first contactor is connected with the power supply driving circuit; The normally closed contact of the second intermediate relay, the normally open contact of the first contactor and the A1 end of the coil of the first intermediate relay are all connected with the first target fire line of the output end of the first power supply circuit, and the A2 end of the coil of the first intermediate relay is respectively connected with the zero line of the output end of the first power supply circuit and the zero line of the output end of the second power supply circuit; The normally closed contact of the second contactor is respectively connected with the normally closed contact of the second intermediate relay and the normally open contact of the first contactor; The A1 end of the coil of the first contactor is connected with the normally closed contact of the second contactor, and the A2 end of the coil of the first contactor is respectively connected with the zero line of the output end of the first power supply circuit and the zero line of the output end of the second power supply circuit; The input end of the main contact of the second contactor is connected with the output end of the second power supply circuit, and the output end of the main contact of the second contactor is connected with the power supply driving circuit; The normally closed contact of the first intermediate relay, the normally closed contact of the first intermediate relay and the normally open contact of the second contactor are all connected with the first target fire line of the output end of the second power supply circuit; the first target fire line is any one of the fire line of the output end of the first power supply circuit and the output end of the second power supply circuit; The A1 end of the coil of the second intermediate relay is connected with the normally closed contact of the second contactor, and the A2 end of the coil of the first intermediate relay is respectively connected with the zero line of the output end of the first power supply circuit and the zero line of the output end of the second power supply circuit; The normally closed contact of the first contactor is respectively connected with the normally closed contact of the first intermediate relay and the normally open contact of the second contactor; The A1 end of the coil of the second contactor is connected with the normally closed contact of the first contactor, and the A2 end of the coil of the second contactor is respectively connected with the zero line of the output end of the first power supply circuit and the zero line of the output end of the second power supply circuit.

3. The dual automatic transfer system for AC motor according to claim 2, wherein The automatic switching circuit further comprises a first two-position switch and a second two-position switch; One end of the first two-position switch is connected with the first target firewire of the output end of the first power supply circuit, and the other end of the first two-position switch is connected with the normally closed contact of the first intermediate relay and the normally open contact of the second contactor respectively; One end of the second two-position switch is connected with the first target firewire of the output end of the second power supply circuit, and the other end of the second two-position switch is connected with the normally closed contact of the second intermediate relay and the normally open contact of the second contactor respectively.

4. The dual automatic transfer system for AC motor according to claim 3, wherein The model of the first two-position switch or the second two-position switch is XB2BD25C.

5. The dual automatic transfer system for AC motor of claim 2, wherein The model of the first intermediate relay or the second intermediate relay is CDZ9-62P.

6. The dual automatic transfer system for AC motor of claim 1, wherein The first power supply circuit specifically comprises a first circuit breaker. The main contact input end of the first circuit breaker is connected with the first three-phase power supply, and the main contact output end of the first circuit breaker is connected with the first input end of the automatic switching circuit.

7. The dual automatic transfer system for AC motor according to claim 6, wherein The first power supply circuit further comprises a first phase sequence detection device. The main contact input end of the first phase sequence detection device is connected with the main contact output end of the first circuit breaker, and the output end of the first phase sequence detection device is connected with the first input end of the automatic switching circuit. One end of the normally open contact of the first phase sequence detection device is connected with the first target firewire end of the first circuit breaker, and the other end of the normally open contact of the first phase sequence detection device is connected with the first input end of the automatic switching circuit; the first phase sequence detection device is used for detecting the phase sequence of the first power supply circuit, and when the phase sequence of the first power supply circuit is correct, the normally open contact of the first phase sequence detection device is closed.

8. The dual automatic transfer system for AC motor of claim 1, wherein The second power supply circuit specifically comprises a second circuit breaker. The main contact input end of the second circuit breaker is connected with the second three-phase power supply, and the main contact output end of the second circuit breaker is connected with the second input end of the automatic switching circuit.

9. The dual automatic transfer system for AC motor according to claim 8, wherein The second power supply circuit further comprises a second phase sequence detection device. The main contact input end of the second phase sequence detection device is connected with the main contact output end of the second circuit breaker, and the output end of the second phase sequence detection device is connected with the second input end of the automatic switching circuit. One end of the normally open contact of the second phase sequence detection device is connected with the first target firewire end of the second circuit breaker, and the other end of the normally open contact of the second phase sequence detection device is connected with the second input end of the automatic switching circuit; the second phase sequence detection device is used for detecting the phase sequence of the second power supply circuit, and when the phase sequence of the second power supply circuit is correct, the normally open contact of the second phase sequence detection device is closed.

10. The dual automatic transfer system for AC motor of claim 1, wherein The power supply driving circuit specifically comprises a third contactor and a third circuit breaker. The input end of the main contact of the third contactor is connected with the output end of the first power supply circuit and the output end of the second power supply circuit respectively, and the output end of the main contact of the third contactor is connected with the main contact input end of the third circuit breaker. The main contact output end of the third circuit breaker is connected with the alternating current motor. The A1 end of the coil of the third contactor is connected with the second target firewire of the output end of the second power supply circuit, and the A2 end of the coil of the third contactor is connected with the third target firewire of the output end of the second power supply circuit; the second target firewire is any firewire among the output end of the first power supply circuit and the output end of the second power supply circuit; and the third target firewire is any firewire among the output end of the first power supply circuit and the output end of the second power supply circuit except the second target firewire.

Images