CN113232694B - Three-phase motor power supply system - Google Patents
Three-phase motor power supply system Download PDFInfo
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- CN113232694B CN113232694B CN202110614587.5A CN202110614587A CN113232694B CN 113232694 B CN113232694 B CN 113232694B CN 202110614587 A CN202110614587 A CN 202110614587A CN 113232694 B CN113232694 B CN 113232694B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/06—Electric devices for operating points or scotch-blocks, e.g. using electromotive driving means
- B61L5/065—Construction of driving mechanism
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The application discloses three-phase motor power supply system, wherein, three-phase motor is applied to train switch drive. This three-phase motor power supply system includes: an input side signal detection circuit and three input side voltage detection relays. Each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay. And the input side signal detection circuit is used for detecting a first state after the normally open contacts of the three input side voltage detection relays are connected in series and a second state after the normally closed contacts of the three input side voltage detection relays are connected in series, and when the first state and the second state are consistent, the input side power supply abnormality of the three-phase motor is determined. Whether power supply on the input side of the three-phase motor is abnormal or not can be accurately detected through an input side signal detection circuit and three input side voltage detection relays which are arranged on the input side of the three-phase motor.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a three-phase motor power supply system.
Background
The line turnout in the high-speed magnetic suspension traffic system adopts an integral movable design, and a three-phase motor drives gears and racks in the line turnout to transmit. Whether the three-phase motor supplies power is normal or not is related to the accuracy of turnout movement and the safety of train operation.
At present, whether the three-phase motor supplies power normally can be detected by continuously detecting the voltage state of the power supply output side of the three-phase motor. However, by the method, only whether the power supply output side of the three-phase motor is normal can be known, and the safety requirement of the line turnout cannot be met.
Disclosure of Invention
In order to solve the technical problem, the application provides a three-phase motor power supply system, and whether the power supply state of the input side of a three-phase motor is normal or not can be accurately detected through an input side signal detection circuit and an input side voltage detection relay in the three-phase motor power supply system.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
the embodiment of the application provides a three-phase motor power supply system, wherein the three-phase motor is applied to train turnout driving; the method comprises the following steps: an input side signal detection circuit and three input side voltage detection relays;
each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay;
the input side signal detection circuit is used for detecting a first state after the normally open contacts of the three input side voltage detection relays are connected in series, and a second state after the normally closed contacts of the three input side voltage detection relays are connected in series, and when the first state is consistent with the second state, the input side signal detection circuit determines that the input side power supply of the three-phase motor is abnormal.
Optionally, the input side signal detection circuit includes an input side optical coupler or an input side magnetic coupler.
Optionally, the input-side optical coupler comprises a first input-side optical coupler and a second input-side optical coupler;
the first input end of the first input side optical coupler is grounded, and the second input end of the first input side optical coupler is connected with the normally open contacts of the three input side voltage detection relays in series; the first output end of the first input side optical coupler is grounded, and the second output end of the first input side optical coupler is used for outputting high and low levels after the normally open contacts of the three input side voltage detection relays are connected in series as a first state;
the first input end of the second input side optical coupler is grounded, and the second input end of the second input side optical coupler is connected with the normally closed contacts of the three input side voltage detection relays in series; and a first output end of the second input side optical coupler is grounded, and a second output end is used for outputting high and low levels after the normally closed contacts of the three input side voltage detection relays are connected in series as a second state.
Optionally, when the first state is a low level and the second state is a high level, it is determined that the input side of the three-phase motor is in a power-on state.
Optionally, when the first state is a high level and the second state is a low level, it is determined that the input side of the three-phase motor is in a power-off state.
Optionally, the three-phase motor power supply system further includes: the device comprises an output side signal detection circuit, three output side voltage detection relays and a control auxiliary relay;
each phase power supply line on the output side of the three-phase motor is grounded through a corresponding output side voltage detection relay;
and the output side signal detection circuit is used for detecting a third state after the normally open contacts of the three output side voltage detection relays are connected in series, and a fourth state after the normally closed contacts of the three output side voltage detection relays and the normally closed contacts of the control auxiliary relays are connected in series.
Optionally, the output side signal detection circuit includes an output side optical coupler or an output side magnetic coupler.
Optionally, the output side optical coupler includes a first output side optical coupler and a second output side optical coupler;
the first input end of the first output side optical coupler is grounded, and the second input end of the first output side optical coupler is connected with normally open contacts of the three output side voltage detection relays in series; the first output end of the first output side optical coupler is grounded, and the second output end of the first output side optical coupler is used for outputting high and low levels of the three output side voltage detection relays after the normally open contacts are connected in series as a third state;
the first input end of the second output side optical coupler is grounded, and the second input end is connected in series with the normally closed contacts of the three output side voltage detection relays and the normally closed contact of the control auxiliary relay; and a first output end of the second output side optical coupler is grounded, and a second output end of the second output side optical coupler is used for outputting high and low levels after the normally closed contacts of the three output side voltage detection relays and the normally closed contact of the control auxiliary relay are connected in series as a fourth state.
Optionally, when the third state is a low level and the fourth state is a high level, it is determined that the output side of the three-phase motor is in a power-on state.
Optionally, when the third state is a high level and the fourth state is a low level, it is determined that the output side of the three-phase motor is in a power-off state.
According to the technical scheme, the method has the following beneficial effects:
the embodiment of the application provides a three-phase motor power supply system, wherein, three-phase motor is applied to train switch drive. This three-phase motor power supply system includes: an input side signal detection circuit and three input side voltage detection relays. Each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay. And the input side signal detection circuit is used for detecting a first state after the normally open contacts of the three input side voltage detection relays are connected in series and a second state after the normally closed contacts of the three input side voltage detection relays are connected in series, and when the first state and the second state are consistent, the input side power supply abnormality of the three-phase motor is determined. Whether power supply on the input side of the three-phase motor is abnormal or not can be accurately detected through an input side signal detection circuit and three input side voltage detection relays which are arranged on the input side of the three-phase motor.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a three-phase motor power supply system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another three-phase motor power supply system provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of another three-phase motor power supply system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another three-phase motor power supply system according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
The line turnout of the high-speed magnetic suspension traffic system adopts an integral movable turnout design, and is driven by a three-phase motor through a gear and a rack. During the turnout driving and maintaining process, the three-phase motor is powered on and powered off. Whether the three-phase motor supplies power normally is related to the accuracy of turnout movement and the safety of train operation.
Currently, a method for determining whether a three-phase motor supplies power normally in the related art is to continuously monitor a voltage state of a power supply output side. However, the method cannot realize the power supply detection of the input side of the three-phase motor, so that the safety level of the power supply/cut-off detection of the three-phase motor is low, and the safety requirement of the high-speed magnetic suspension turnout cannot be met.
Based on this, this application embodiment provides a three-phase motor power supply system, and the three-phase motor is applied to train switch drive. This three-phase motor power supply system includes: an input side signal detection circuit and three input side voltage detection relays. Each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay. And the input side signal detection circuit is used for detecting a first state after the normally open contacts of the three input side voltage detection relays are connected in series and a second state after the normally closed contacts of the three input side voltage detection relays are connected in series, and when the first state and the second state are consistent, the input side power supply abnormality of the three-phase motor is determined. The input side signal detection circuit and the three input side voltage detection relays are arranged on the input side of the three-phase motor, so that whether power supply on the input side of the three-phase motor is abnormal or not can be accurately detected, and the detection safety level of power supply/cut-off of the three-phase motor is improved.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a three-phase motor power supply system according to an embodiment of the present application. Wherein, the three-phase motor is applied to train switch drive. As shown in fig. 1, the three-phase motor power supply system includes: an input side signal detection circuit 2 and three input side voltage detection relays 11, 12, and 13.
The three-phase motor includes a three-phase motor input side and a three-phase motor output side. And the input side of the three-phase motor is connected with a power supply, and the power supply supplies power to the input side of the three-phase motor through a three-phase power supply line. The output side of the three-phase motor is connected with a load and used for supplying power to the load. As shown in fig. 1, the three-phase power supply lines on the input side of the three-phase motor are L1, L2, and L3, respectively. Each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay. That is, the L1 power supply line on the input side of the three-phase motor is grounded through the corresponding input side voltage detection relay 11. The L2 power supply line on the input side of the three-phase motor is grounded through the corresponding input side voltage detection relay 12. The L3 power supply line on the input side of the three-phase motor is grounded through the corresponding input-side voltage detection relay 13.
The working principle of the input side voltage detection relay is that when the voltage at two ends of the input side voltage detection relay reaches a voltage threshold condition, namely the voltage rises to or is greater than the voltage threshold, the input side voltage detection relay acts, a normally closed contact of the input side voltage detection relay is opened, and a normally open contact of the input side voltage detection relay is closed. As shown in fig. 1, the three normally open contacts of the input side voltage detection relays 11, 12, and 13 are connected in series in this order, and the three normally closed contacts of the input side voltage detection relays 11, 12, and 13 are connected in series in this order. It can be understood that, when the power supply source on the input side of the three-phase motor supplies power normally, the voltage across each input side voltage detection relay satisfies the voltage threshold condition, so that the normally open contact of each input side voltage detection relay is closed and the normally closed contact is opened. When the power supply at the input side of the three-phase motor is normally cut off, the normally open contact and the normally closed contact of each input side voltage detection relay keep not to act.
And the input side signal detection circuit 2 is used for detecting a first state after the normally open contacts of the three input side voltage detection relays 11, 12 and 13 are connected in series and a second state after the normally closed contacts of the three input side voltage detection relays 11, 12 and 13 are connected in series, and when the first state and the second state are consistent, determining that the input side power supply of the three-phase motor is abnormal.
It is understood that the first state is associated with the normally open contacts of the three input side voltage detecting relays 11, 12, and 13 connected in series in this order, and the second state is associated with the normally closed contacts of the three input side voltage detecting relays connected in series in this order. The first state and the second state are not identical when the input side of the three-phase motor is normally powered on or off. That is, when the first state and the second state detected by the input side signal detection circuit 2 coincide, it is determined that an abnormality occurs in the input side power supply of the three-phase motor. Therefore, whether power supply on the input side of the three-phase motor is abnormal or not can be accurately detected by using the input side signal detection circuit and the three input side voltage detection relays which are arranged on the input side of the three-phase motor.
As an example, the first state is high and low, and the second state is high and low.
As an example, the input side signal detection circuit 2 includes an input side photo coupler, i.e., the input side signal detection circuit 2 is composed of an input side photo coupler. As another example, the input side signal detection circuit 2 includes an input side magnetic coupler. It should be noted that, in the embodiments of the present application, specific components of the input-side signal detection circuit are not limited, and other coupling devices may be selected to replace the input-side optical coupler or the input-side magnetic coupler according to actual needs.
Through the three-phase motor power supply system that this application embodiment provided, three-phase motor is applied to train switch drive. The three-phase motor power supply system includes an input side signal detection circuit and three input side voltage detection relays provided at an input side of the three-phase motor. Each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay. The input side signal detection circuit can accurately detect whether the power supply of the input side of the three-phase motor is abnormal or not by utilizing the first state obtained by detecting the series connection of the normally open contacts of the three input side voltage detection relays and the second state obtained by detecting the series connection of the normally closed contacts of the three input side voltage detection relays, so that the detection safety level of the power supply/cut-off of the three-phase motor is improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another three-phase motor power supply system provided in the embodiment of the present application. It should be noted that fig. 2 is an exemplary structure of the three-phase power supply system shown in fig. 1 in practical application.
As shown in fig. 2, the three-phase motor power supply system includes an input side signal detection circuit and three input side voltage detection relays L1A, L2A, and L3A.
In this example, the input side signal detection circuit includes an input side photo coupler, i.e., the input side signal detection circuit is composed of an input side photo coupler. Further, the input side optical couplers include a first input side optical coupler OC _ A1 and a second input side optical coupler OC _ A2. The first input-side optocoupler OC _ A1 and the second input-side optocoupler OC _ A2 each comprise a diode and a transistor. The two ends of the diode are two input ends of the optical coupler, and the two ends of the triode are two output ends of the optical coupler.
As shown in fig. 2, the first input terminal of the first input side photocoupler OC _ A1 is grounded, and the second input terminal is connected in series with the normally open contacts of the three input side voltage detection relays L1A, L2A, and L3A. That is, one end of the diode in the first input side photo-coupler OC _ A1 is grounded, and the other end is connected in series with the normally open contacts of the three input side voltage detection relays L1A, L2A, and L3A.
The first output end of the first input side optical coupler OC _ A1 is grounded, and the second output end is used for outputting high and low levels after the normally open contacts L1A, L2A and L3A of the three input side voltage detection relays are connected in series as a first state. That is, one end of the transistor in the first input side photocoupler OC _ A1 is grounded, and the other end outputs a high-low level Sd _ a obtained by connecting normally open contacts of three input side voltage detection relays L1A, L2A, and L3A in series, and the first state is also represented by Sd _ a.
A first input terminal of the second input side photo-coupler OC _ A2 is grounded, and a second input terminal is connected in series with normally closed contacts of the three input side voltage detection relays L1A, L2A, and L3A. That is, one end of the diode in the second input side photo-coupler OC _ A2 is grounded, and the other end is connected in series with the normally closed contacts of the three input side voltage detection relays L1A, L2A, and L3A.
A first output terminal of the second input side photo coupler OC _ A2 is grounded, and a second output terminal is used for outputting a high-low level after the normally closed contacts of the three input side voltage detection relays L1A, L2A, and L3A are connected in series as a second state. That is, one end of the transistor in the second input side photo coupler OC _ A2 is grounded, and the other end outputs a high-low level/Sd _ a after the normally closed contacts of the three input side voltage detection relays L1A, L2A, and L3A are connected in series, and the second state is also represented by/Sd _ a.
It should be noted that, when the power supply on the input side of the three-phase motor supplies power normally, all three input side voltage detection relays L1A, L2A, and L3A reach the voltage threshold condition, the normally closed contact of each input side voltage detection relay is opened, and the normally open contact is closed. The normally open contacts of the three input-side voltage detection relays L1A, L2A, and L3A connected in series in sequence are all closed, so that the high-low level Sd _ a output by the second output terminal of the first input-side optical coupler OC _ A1 is a low level. And the normally closed contacts of the three input side voltage detection relays L1A, L2A, and L3A connected in series in this order are all opened, so that the high-low level/Sd _ a of the second output terminal of the second input side photo-coupler OC _ A2 is high level. The input side of the three-phase motor is determined to be in a power-on state when the first state is a low level and the second state is a high level.
In addition, when the power supply on the input side of the three-phase motor is disconnected, all of the three input side voltage detection relays L1A, L2A, and L3A do not reach the voltage threshold condition, and the normally closed contact and the normally open contact of each input side voltage detection relay are held. The normally open contacts of the three input-side voltage detection relays L1A, L2A, and L3A connected in series in sequence are all in an open state, so that the high-low level Sd _ a output by the second output terminal of the first input-side optocoupler OC _ A1 is at a high level. And the normally closed contacts of the three input side voltage detection relays L1A, L2A, and L3A connected in series in this order are all closed, so that the high-low level/Sd _ a of the second output terminal of the second input side photocoupler OC _ A2 is at a low level. The input side of the three-phase motor is determined to be in a power-off state when the first state is a high level and the second state is a low level.
When the first state and the second state are both high level or both low level, it means that the first state and the second state are identical. At this time, the input side power supply of the three-phase motor is abnormal. In general, a failure of a power supply source on the input side of a three-phase motor may cause a power supply abnormality, or a disconnection of a power supply line on the input side of the three-phase motor may cause a power supply abnormality.
Through the three-phase motor power supply system that this application embodiment provided, three-phase motor is applied to train switch drive. The three-phase motor power supply system includes an input-side signal detection circuit and three input-side voltage detection relays provided on the input side of the three-phase motor. Each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay. The input side signal detection circuit utilizes the first state obtained by detecting that the normally open contacts of the three input side voltage detection relays are connected in series and the second state obtained by detecting that the normally closed contacts of the three input side voltage detection relays are connected in series, so that the purpose of accurately detecting whether the power supply on the input side of the three-phase motor is abnormal is realized, and the detection safety level of the power supply/cut-off of the three-phase motor is improved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another three-phase motor power supply system provided in the embodiment of the present application. As shown in fig. 3, in the embodiment of the present application, in addition to the input side signal detection circuit and the three input side voltage detection relays, the three-phase motor power supply system further includes: an output side signal detection circuit 4, three output side voltage detection relays 31, 32, and 33, and a control auxiliary relay RA. The control auxiliary relay RA comprises a normally open contact and a normally closed contact.
The three-phase power supply lines on the output side of the three-phase motor are L1', L2' and L3', respectively. Each phase power supply line on the output side of the three-phase motor is grounded through a corresponding output side voltage detection relay. That is, the L1' power supply line on the output side of the three-phase motor is grounded through the corresponding output-side voltage detection relay 31. The L2' power supply line on the output side of the three-phase motor is grounded through the corresponding output-side voltage detection relay 32. The L3' power supply line on the output side of the three-phase motor is grounded through the corresponding output-side voltage detection relay 33.
It should be noted that the power supply system of the three-phase motor further includes a power supply switch KM, and the power supply switch KM connects the input side of the three-phase motor and the output side of the three-phase motor. After the normally open contact of the auxiliary control relay RA is closed, the coil of the power supply switch KM is controlled to be electrified, and therefore the power supply switch KM is controlled to be closed to control the output side of the three-phase motor to be electrified. When the normally open contact of the auxiliary relay RA is controlled not to be closed, the coil of the power supply switch KM is not powered, and the power supply switch KM is in a disconnected state to control the power failure of the output side of the three-phase motor.
It can be understood that when the output sides of the three-phase motor are normally supplied with power, the voltage at two ends of each output-side voltage detection relay meets the voltage threshold condition, so that the normally open contact of each output-side voltage detection relay is closed and the normally closed contact is opened. When the power supply of the output side of the three-phase motor is normally cut off, the normally open contact and the normally closed contact of each output side voltage detection relay keep not to act.
As shown in fig. 3, the three normally open contacts of the output side voltage detection relays 31, 32, and 33 are connected in series in this order, and the three normally closed contacts of the output side voltage detection relays 31, 32, and 33 and the normally closed contact of the control auxiliary relay are connected in series in this order.
And the output side signal detection circuit 4 is used for detecting a third state after the normally open contacts of the three output side voltage detection relays 31, 32 and 33 are connected in series, and a fourth state after the normally closed contacts of the three output side voltage detection relays 31, 32 and 33 and the normally closed contact of the control auxiliary relay RA are connected in series, and when the third state and the fourth state are consistent, determining that the output side power supply of the three-phase motor is abnormal.
It is to be understood that the third state is associated with the normally open contacts of the three output side voltage detection relays 31, 32, and 33 connected in series in this order, and the fourth state is associated with the normally closed contacts of the three output side voltage detection relays connected in series in this order and the control auxiliary relay RA. The third state and the fourth state are not identical when the output side of the three-phase motor is normally powered on or off. That is, when the third state and the fourth state detected by the output side signal detection circuit 4 coincide, it is determined that an abnormality occurs in the output side power supply of the three-phase motor. Thus, it is possible to accurately detect whether or not the power supply on the output side of the three-phase motor is abnormal by the output-side signal detection circuit provided on the output side of the three-phase motor and the three output-side voltage detection relays 31, 32, and 33.
As an example, the third state is high and low, and the fourth state is high and low.
As an example, the output side signal detection circuit 4 includes an output side optical coupler, i.e., the output side signal detection circuit 4 is composed of an output side optical coupler. As another example, the output side signal detection circuit 4 includes an output side magnetic coupler. It should be noted that, in the embodiment of the present application, the specific structure of the output-side signal detection circuit is not limited, and devices of other coupling modes may be selected to replace the output-side optical coupler or the output-side magnetic coupler according to actual needs.
It should be noted that the input side signal detection circuit and the three input side voltage detection relays, which are included on the input side of the three-phase motor and included in the three-phase motor power supply system in the embodiment of the present application, are the same as those in the foregoing embodiment, and for the sake of brevity, detailed description thereof is omitted.
Through the three-phase motor power supply system that this application embodiment provided, three-phase motor is applied to train switch drive. The three-phase motor power supply system comprises an input side signal detection circuit and three input side voltage detection relays which are arranged on the input side of the three-phase motor, and an output side signal detection circuit and three output side voltage detection relays which are arranged on the output side of the three-phase motor. Each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay. The input side signal detection circuit achieves the purpose of accurately detecting whether power supply on the input side of the three-phase motor is abnormal or not by using the first state obtained by detecting that the normally open contacts of the three input side voltage detection relays are connected in series and the second state obtained by detecting that the normally closed contacts of the three input side voltage detection relays are connected in series. Each phase power supply line on the output side of the three-phase motor is grounded through a corresponding output side voltage detection relay. The output side signal detection circuit realizes the purpose of accurately detecting whether the power supply on the input side of the three-phase motor is abnormal or not by using the third state obtained by detecting that the normally open contacts of the three output side voltage detection relays are connected in series, and the fourth state obtained by detecting that the normally closed contacts of the three output side voltage detection relays are connected in series and the normally closed contact of the control auxiliary relay are connected in series. Through the three-phase motor power supply system, whether power supply on the input side and the output side of the three-phase motor is abnormal or not can be checked at the same time, and the detection safety level of power supply/cut-off of the three-phase motor is improved.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another three-phase motor power supply system provided in the embodiment of the present application. It should be noted that fig. 4 is an exemplary structure of the three-phase power supply system shown in fig. 3 in practical application.
As shown in fig. 4, the three-phase motor power supply system includes an input-side signal detection circuit and three input-side voltage detection relays L1A, L2A, and L3A. In addition, the three-phase motor power supply system further includes an output side signal detection circuit and three output side voltage detection relays L1B, L2B, and L3B. The input side signal detection circuit and the three input side voltage detection relays L1A, L2A, and L3A included in the three-phase motor power supply system are described in the embodiment shown in fig. 2, and are not described again here.
In this example, the output side signal detection circuit comprises an output side optical coupler, i.e. the output side signal detection circuit consists of an output side optical coupler. Further, the output side optical couplers include a first output side optical coupler OC _ B1 and a second output side optical coupler OC _ B2. The first output-side optical coupler OC _ B1 and the second output-side optical coupler OC _ B2 each include a diode and a transistor. The two ends of the diode are two input ends of the optical coupler, and the two ends of the triode are two output ends of the optical coupler.
As shown in fig. 4, the first input terminal of the first output-side optical coupler OC _ B1 is grounded, and the second input terminal is connected in series with the normally open contacts of the three output-side voltage detection relays L1B, L2B, and L3B. That is, one end of the diode in the first output-side optical coupler OC _ B1 is grounded, and the other end is connected in series with normally open contacts of the three output-side voltage detection relays L1B, L2B, and L3B.
The first output end of the first output side optical coupler OC _ B1 is grounded, and the second output end is used for outputting the high and low levels of the three output side voltage detection relays after the L1B, L2B and L3B normally open contacts are connected in series as a third state. That is, one end of the transistor in the first output side optical coupler OC _ B1 is grounded, and the other end outputs a high-low level Sd _ B after the normally open contacts of the three output side voltage detection relays L1B, L2B, and L3B are connected in series, and a third state is also represented by Sd _ B.
The first input terminal of the second output-side optical coupler OC _ B2 is grounded, and the second input terminal is connected in series with the normally closed contacts of the three output-side voltage detection relays L1B, L2B, and L3B and the normally closed contact of the control auxiliary relay RA. That is, one end of the diode in the second output-side optical coupler OC _ B2 is grounded, and the other end is connected in series with the normally closed contacts of the three output-side voltage detection relays L1B, L2B, and L3B and the normally closed contact of the control auxiliary relay RA.
The first output end of the second output side optical coupler OC _ B2 is grounded, and the second output end is used for outputting a high-low level after the normally closed contacts of the three output side voltage detection relays L1B, L2B and L3B and the normally closed contact of the control auxiliary relay RA are connected in series as a fourth state. That is, one end of the transistor in the second output side optical coupler OC _ B2 is grounded, and the other end outputs a high-low level/Sd _ B after the normally closed contacts of the three output side voltage detection relays L1B, L2B, and L3B and the normally closed contact of the control auxiliary relay RA are connected in series, and the fourth state is also represented by/Sd _ B.
It should be noted that, when the power supply of the output side of the three-phase motor is normal, the normally closed contact of the auxiliary relay RA is controlled to be opened, and the three output side voltage detection relays L1B, L2B, and L3B all reach the voltage threshold condition, the normally closed contact of each output side voltage detection relay is opened, and the normally open contact is closed. Normally open contacts of the three output side voltage detection relays L1B, L2B, and L3B connected in series in sequence are all closed, so that the high-low level Sd _ B output by the second output end of the first output side optical coupler OC _ B1 is a low level. And the normally closed contacts of the three output side voltage detection relays L1B, L2B, L3B and the control auxiliary relay RA, which are connected in series in sequence, are all opened, so that the high-low level/Sd _ B of the second output end of the second output side optical coupler OC _ B2 is high level. When the third state is a low level and the fourth state is a high level, it is determined that the output side of the three-phase motor is in the power-on state.
In addition, when the power supply of the output side of the three-phase motor is disconnected, none of the three output side voltage detection relays L1B, L2B, and L3B reaches the voltage threshold condition, and the normally closed contact and the normally open contact of each output side voltage detection relay are maintained. Normally open contacts of the three output side voltage detection relays L1B, L2B, and L3B connected in series in sequence are all in an open state, so that the high-low level Sd _ B output by the second output end of the first output side optical coupler OC _ B1 is a high level. And the normally closed contacts of the three output side voltage detection relays L1B, L2B, L3B and the control auxiliary relay RA connected in series in sequence are all in a closed state, so that the high-low level/Sd _ B of the second output end of the second output side optical coupler OC _ B2 is at a low level. It is determined that the output side of the three-phase motor is in a power-off state when the third state is a high level and the fourth state is a low level.
When the third state and the fourth state are both high or low, it means that the third state and the fourth state are identical. At this time, the output side power supply of the three-phase motor is abnormal. In general, a failure in the load on the output side of the three-phase motor may cause an abnormal power supply, or a disconnection in the power supply line on the output side of the three-phase motor may cause an abnormal power supply.
It should also be noted that the input side of the three-phase motor in the three-phase motor power supply system can be connected with two power supplies, and the output side of the three-phase motor is connected with a load, so that the three-phase motor has two redundant power supply circuits to supply power to the load at the same time.
In addition, when the power supply abnormality at the input side or the output side of the three-phase motor is detected, a specific abnormal position needs to be searched, and fault maintenance is carried out on the abnormal position, so that the accuracy of turnout movement and the safety of train operation are ensured.
Through the three-phase motor power supply system that this application embodiment provided, three-phase motor is applied to train switch drive. The three-phase motor power supply system comprises an input side signal detection circuit and three input side voltage detection relays which are arranged on the input side of the three-phase motor, and an output side signal detection circuit and three output side voltage detection relays which are arranged on the output side of the three-phase motor. Each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay. The input side signal detection circuit achieves the purpose of accurately detecting whether power supply on the input side of the three-phase motor is abnormal or not by using the first state obtained by detecting that the normally open contacts of the three input side voltage detection relays are connected in series and the second state obtained by detecting that the normally closed contacts of the three input side voltage detection relays are connected in series. Each phase power supply line on the output side of the three-phase motor is grounded through a corresponding output side voltage detection relay. The output side signal detection circuit realizes the purpose of accurately detecting whether the power supply on the input side of the three-phase motor is abnormal or not by using the third state obtained by detecting that the normally open contacts of the three output side voltage detection relays are connected in series, and the fourth state obtained by detecting that the normally closed contacts of the three output side voltage detection relays are connected in series and the normally closed contact of the control auxiliary relay are connected in series. Through the three-phase motor power supply system, whether power supply on the input side and the output side of the three-phase motor is abnormal or not can be checked at the same time, and the detection safety level of power supply/cut-off of the three-phase motor is improved.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the method disclosed by the embodiment, the method corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The three-phase motor power supply system is characterized in that the three-phase motor is applied to train turnout driving; the method comprises the following steps: an input side signal detection circuit and three input side voltage detection relays;
each phase power supply line on the input side of the three-phase motor is grounded through a corresponding input side voltage detection relay;
the input side signal detection circuit is used for detecting a first state after the normally open contacts of the three input side voltage detection relays are connected in series and a second state after the normally closed contacts of the three input side voltage detection relays are connected in series, and when the first state is consistent with the second state, the input side signal detection circuit determines that the input side power supply of the three-phase motor is abnormal;
the input side signal detection circuit comprises an input side optical coupler or an input side magnetic coupler;
the input side optical coupler comprises a first input side optical coupler and a second input side optical coupler; the first input side optical coupler comprises a diode and a triode; the second input side optical coupler comprises a diode and a triode; the two ends of the diode in the first input side optical coupler are a first input end and a second input end of the first input side optical coupler; two ends of a triode in the first input side optical coupler are a first output end and a second output end of the first input side optical coupler; the two ends of the diode in the second input side optical coupler are a first input end and a second input end of the second input side optical coupler; two ends of a triode in the second input side optical coupler are a first output end and a second output end of the second input side optical coupler;
the first input end of the first input side optical coupler is grounded, and the second input end of the first input side optical coupler is connected with the normally open contacts of the three input side voltage detection relays in series; the first output end of the first input side optical coupler is grounded, and the second output end of the first input side optical coupler is used for outputting high and low levels after the normally open contacts of the three input side voltage detection relays are connected in series as a first state;
the first input end of the second input side optical coupler is grounded, and the second input end of the second input side optical coupler is connected with the normally closed contacts of the three input side voltage detection relays in series; and a first output end of the second input side optical coupler is grounded, and a second output end is used for outputting high and low levels after the normally closed contacts of the three input side voltage detection relays are connected in series as a second state.
2. The three-phase motor power supply system according to claim 1, wherein when the first state is a low level and the second state is a high level, it is determined that the input side of the three-phase motor is in a power-on state.
3. The three-phase motor power supply system according to claim 1, wherein when the first state is a high level and the second state is a low level, it is determined that the input side of the three-phase motor is in a power-off state.
4. The three-phase electric motor power supply system of claim 1, further comprising: the device comprises an output side signal detection circuit, three output side voltage detection relays and a control auxiliary relay;
each phase of power supply line on the output side of the three-phase motor is grounded through a corresponding output side voltage detection relay;
output side signal detection circuitry for detect the third state after the normally open contact of three output side voltage detection relay establishes ties, the fourth state after the normally closed contact of three output side voltage detection relay and the normally closed contact of control auxiliary relay establish ties, work as the third state with when the fourth state is unanimous, confirm the output side power supply of three-phase motor is unusual.
5. The three-phase electromechanical power supply system according to claim 4, wherein the output-side signal detection circuit includes an output-side optical coupler or an output-side magnetic coupler.
6. The three-phase dynamoelectric system of claim 5, wherein said output-side optical coupler comprises a first output-side optical coupler and a second output-side optical coupler; the first output side optical coupler comprises a diode and a triode; the second output side optical coupler comprises a diode and a triode; two ends of a diode in the first output side optical coupler are a first input end and a second input end of the first output side optical coupler; two ends of a triode in the first output side optical coupler are a first output end and a second output end of the first output side optical coupler; two ends of a diode in the second output side optical coupler are a first input end and a second input end of the second output side optical coupler; two ends of a triode in the second output side optical coupler are a first output end and a second output end of the second output side optical coupler;
the first input end of the first output side optical coupler is grounded, and the second input end of the first output side optical coupler is connected with normally open contacts of the three output side voltage detection relays in series; the first output end of the first output side optical coupler is grounded, and the second output end of the first output side optical coupler is used for outputting high and low levels of the three output side voltage detection relays after the normally open contacts are connected in series as a third state;
the first input end of the second output side optical coupler is grounded, and the second input end is connected in series with the normally closed contacts of the three output side voltage detection relays and the normally closed contact of the control auxiliary relay; and a first output end of the second output side optical coupler is grounded, and a second output end of the second output side optical coupler is used for outputting high and low levels after the normally closed contacts of the three output side voltage detection relays and the normally closed contact of the control auxiliary relay are connected in series as a fourth state.
7. A three-phase motor power supply system according to any one of claims 4 to 6, characterized in that when said third state is a low level and said fourth state is a high level, it is determined that the output side of said three-phase motor is in a power-on state.
8. A three-phase motor power supply system according to any one of claims 4 to 6, characterized in that when said third state is a high level and said fourth state is a low level, it is determined that the output side of said three-phase motor is in a power-off state.
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| JP2010172149A (en) * | 2009-01-26 | 2010-08-05 | Panasonic Corp | Overvoltage protection device |
| CN104142470A (en) * | 2013-05-10 | 2014-11-12 | 台达电子工业股份有限公司 | Relay detection device and operation method thereof |
| CN203745620U (en) * | 2013-12-30 | 2014-07-30 | 深圳市凯世光电科技有限公司 | Lamp testing circuit and device |
| CN108226747A (en) * | 2017-11-30 | 2018-06-29 | 北京康拓科技有限公司 | A kind of dynamic circuit failure on-line detecting method |
| CN108152730B (en) * | 2018-01-15 | 2023-07-18 | 南京工业职业技术学院 | Automobile relay detection device |
| CN108675076B (en) * | 2018-07-20 | 2023-08-15 | 上海新时达电气股份有限公司 | Door lock short circuit detection device |
| CN208874279U (en) * | 2018-08-29 | 2019-05-17 | 广西电网有限责任公司电力科学研究院 | A kind of improved breaker body unbalanced three-phase lines outlet loop |
| CN109586292A (en) * | 2019-01-31 | 2019-04-05 | 中车株洲电力机车有限公司 | A kind of library power supply protection system |
| CN111029212A (en) * | 2019-12-26 | 2020-04-17 | 深圳市蓝海华腾技术股份有限公司 | Relay contact state detection circuit, vehicle and high-voltage power distribution system |
| CN213069121U (en) * | 2020-09-16 | 2021-04-27 | 无锡太湖学院 | Power output voltage detection device |
| CN112666494A (en) * | 2020-12-30 | 2021-04-16 | 大禹电气科技股份有限公司 | Circuit for detecting three-phase mains power failure |
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