CN112104266A - Control circuit and control method of direct-current bus isolating switch - Google Patents
Control circuit and control method of direct-current bus isolating switch Download PDFInfo
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- CN112104266A CN112104266A CN202010802696.5A CN202010802696A CN112104266A CN 112104266 A CN112104266 A CN 112104266A CN 202010802696 A CN202010802696 A CN 202010802696A CN 112104266 A CN112104266 A CN 112104266A
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- contactor
- driving motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/24—Controlling the direction, e.g. clockwise or counterclockwise
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Electromagnetism (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The invention discloses a control circuit and a control method of a direct current bus isolating switch. The direct current bus isolating switch is connected with a driving motor, and the driving motor is used for driving the switching-on and switching-off of the direct current bus isolating switch; the control circuit comprises a main loop and a control loop; the main loop is connected with a driving motor; the control loop comprises a proximity switch, and the proximity switch is used for outputting a control signal to control the main loop to be disconnected when detecting that the direct current bus isolating switch is switched on in place and/or switched off in place, so that the driving motor stops working. Therefore, when the isolating switch detects that the direct-current bus isolating switch is switched on or switched off in place, the isolating switch outputs a control signal to the control loop so as to control the main loop to be disconnected, and therefore the driving motor stops working. The control mode uses the proximity switch to detect whether the closing or opening of the direct-current bus isolating switch is in place, is more reliable compared with a mode of using a mechanical limit to control the disconnection of a contact, and plays a role in protecting a driving motor and a reduction gearbox connected with the driving motor.
Description
Technical Field
The invention relates to the field of circuit control, in particular to a control circuit of a direct-current bus isolating switch and a control method thereof.
Background
In the related art, in the control of the dc bus disconnecting switch of the high-power device, a mechanical limit normally closed contact is usually adopted to be connected in series in a control loop, when a switch is closed or opened in place, a transmission mechanism touches the mechanical limit normally closed contact to open the normally closed contact, and a control loop coil loses power to stop the operation of a dc bus disconnecting switch driving motor. Although the control mode is simple, after the mechanical limit is used for a long time, the phenomena of oxidation of a mechanical limit contact, dust entering the middle of the contact, performance degradation of a contact spring and the like easily exist, the results of overlarge contact resistance of the contact, insensitive action, low control precision, inaccurate background signals and the like are easily caused, a control loop cannot be effectively disconnected when a switch is switched on or switched off in place, a driving motor cannot accurately stop running, and finally the phenomena of reduction gearbox damage, overload of the driving motor and the like are caused.
Disclosure of Invention
The embodiment of the invention discloses a control circuit of a direct-current bus isolating switch and a control method of the control circuit of the direct-current bus isolating switch.
In the control circuit of the direct current bus isolating switch, the direct current bus isolating switch is connected with a driving motor, and the driving motor is used for driving the switching-on and switching-off of the direct current bus isolating switch; the control circuit comprises a main loop and a control loop; the main loop is connected with the driving motor; the control loop comprises a proximity switch, and the proximity switch is used for outputting a control signal to control the main loop to be disconnected when detecting that the direct current bus isolating switch is switched on in place and/or switched off in place, so that the driving motor stops working.
In the control circuit of the direct current bus isolating switch, the proximity switch outputs a control signal to the control loop when detecting that the direct current bus isolating switch is switched on or switched off in place so as to control the main loop to be disconnected, so that the driving motor stops working. The control mode uses the proximity switch to detect whether the switching-on or the switching-off of the direct current bus isolating switch is in place, is more reliable compared with a mode of using a mechanical limit control contact to break, and can effectively avoid the problems of oxidation and performance degradation of a mechanical structure in the mechanical limit control mode, thereby accurately controlling the driving motor to stop working after the switching-on or the switching-off of the direct current bus isolating switch is completed, and playing a role in protecting the driving motor and a reduction gearbox connected with the driving motor.
In some embodiments, the main circuit includes a first contactor and a second contactor, the first contactor and the second contactor are both connected to the driving motor, when the normally open contact of the first contactor is electrically closed, the driving motor rotates forward to drive the dc bus disconnecting switch to switch on, and when the normally open contact of the second contactor is electrically closed, the driving motor rotates backward to drive the dc bus disconnecting switch to switch off. The control signal of the proximity switch is used for controlling the normally open contact of the first contactor to be disconnected in a power-off mode and/or controlling the normally open contact of the second contactor to be disconnected in a power-off mode, so that the main loop is disconnected, and the driving motor stops working.
In some embodiments, the control loop comprises a first control loop and a second control loop, the first control loop comprising a first switch and a second switch. The first switch is connected with a coil of the first contactor, when the first switch is closed, the coil of the first contactor is electrified to enable a normally open contact of the first contactor to be electrified and closed, and the driving motor rotates forwards to drive the direct-current bus isolating switch to be switched on. The second switch is connected with a coil of the second contactor, when the second switch is closed, the coil of the second contactor is electrified to enable a normally open contact of the second contactor to be electrified and closed, and the driving motor rotates reversely to drive the direct-current bus isolating switch to be switched off. The second control loop comprises the proximity switch, the proximity switch is connected with the first control loop, and a control signal output by the proximity switch is used for controlling the first control loop to be disconnected so as to enable the normally open contact of the first contactor and/or the second contactor to be disconnected in a power failure mode, so that the driving motor stops working.
In some embodiments, the first control circuit includes a first relay, the second control circuit includes a first proximity switch, a normally closed contact of the first relay is connected in series with a coil of the first contactor, the coil of the first relay is connected in series with the first proximity switch, when the dc bus isolation switch is switched on in place, the first proximity switch outputs a control signal to control the coil of the first relay to be powered on, the normally closed contact of the first relay is opened, so that the coil of the first contactor is powered off, and the normally open contact of the first contactor is powered off to stop the driving motor.
In some embodiments, the first control loop further comprises a first indicator light connected in series with the normally open contact of the first relay, wherein when the coil of the first relay is energized, the normally open contact of the first relay is closed to operate the first indicator light.
In some embodiments, the first control circuit further includes a second relay, the second control circuit further includes a second proximity switch, a normally closed contact of the second relay is connected in series with a coil of the second contactor, the coil of the second relay is connected in series with the second proximity switch, when the dc bus isolation switch is switched on in place, the second proximity switch outputs a control signal to control the coil of the second relay to be powered on, the normally closed contact of the second relay is opened, so that the coil of the second contactor is powered off, and the normally open contact of the second contactor is powered off and opened, so that the driving motor stops working.
In some embodiments, the first control loop further comprises a second indicator light connected in series with the normally open contact of the second relay, wherein when the coil of the second relay is energized, the normally open contact of the second relay is closed to operate the second indicator light.
According to the control method of the control circuit of the direct-current bus isolating switch, the direct-current bus isolating switch is connected with the driving motor, the driving motor is used for driving the direct-current bus isolating switch to be switched on and switched off, the control circuit comprises a main loop connected with the driving motor and a control loop connected with the main loop, and the control loop comprises the proximity switch. The control method comprises the following steps: judging whether the proximity switch acquires a signal or not; if so, confirming that the direct current bus disconnecting switch is switched on in place or switched off in place; and controlling the main loop to be disconnected so as to stop the driving motor.
In some embodiments, the main circuit includes a contactor connected in series with the drive motor, the drive motor is powered to operate when a normally open contact of the contactor is electrically closed, and the step of controlling the main circuit to open to stop the drive motor includes: and controlling the normally open contact of the contactor to be disconnected in a power failure mode so as to stop the driving motor.
In some embodiments, the control circuit includes a relay having a normally closed contact in series with a coil of the contactor, the coil of the relay being in series with the proximity switch. The step of controlling the normally open contact of the contactor to be disconnected in a power-off mode so as to stop the driving motor comprises the following steps: and controlling the coil of the relay to be electrified so as to break the normally closed contact of the relay, so that the normally open contact of the contactor is disconnected in a power-off mode, and the driving motor stops working.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the connection relationship between a DC bus isolating switch, a control circuit and a driving motor according to an embodiment of the invention;
FIG. 2 is a circuit schematic of the main loop of the control circuit of the DC bus isolation switch of an embodiment of the present invention;
FIG. 3 is a circuit schematic of a first control loop of the control circuit of the DC bus isolation switch according to an embodiment of the present invention;
FIG. 4 is a circuit schematic of a second control loop of the control circuit of the DC bus isolation switch of an embodiment of the present invention;
FIG. 5 is another circuit schematic of the main loop of the control circuit of the DC bus isolation switch of an embodiment of the present invention;
FIG. 6 is another circuit schematic of a first control loop of the control circuit of the DC bus isolation switch according to an embodiment of the present invention;
FIG. 7 is another circuit schematic of a second control loop of the control circuit of the DC bus isolation switch in accordance with an embodiment of the present invention;
FIG. 8 is a flow chart of a control method of a control circuit of a DC bus isolation switch according to an embodiment of the invention;
fig. 9 is another schematic flow chart of a control method of a control circuit of a dc bus isolating switch according to an embodiment of the present invention;
fig. 10 is a schematic flow chart of a control method of a control circuit of a dc bus isolation switch according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1 to 4, the present invention provides a control circuit of a dc bus isolation switch 200. The dc bus isolation switch 200 is connected to a driving motor 300, and the driving motor 300 is used for driving the switching-on and switching-off of the dc bus isolation switch 200. The control circuit comprises a main loop 11 and a control loop 12. The main circuit 11 is connected to a drive motor 300. The control circuit 12 includes a proximity switch SQ, and the proximity switch SQ is used for detecting that the dc bus isolation switch 200 is switched on and/or switched off in place and outputting a control signal to control the main circuit 11 to be switched off, so as to stop the operation of the driving motor 300.
In the embodiment of the present invention, the dc bus isolation switch 200 is driven by the driving motor 300 to perform switching on or switching off, and the control circuit 100 of the dc bus isolation switch 200 may control the driving motor 300 to start and stop.
At present, in the aluminum electrolysis industry, a rectification system converts high-voltage alternating current into strong direct current for aluminum electrolysis to meet the power supply requirement of an electrolysis cell. In the maintenance of the rectifier system, the power supply of the rectifier system needs to be thoroughly disconnected to ensure the safety of personnel. Therefore, in the circuit of the rectifying system, besides a breaker is arranged to cut off the circuit, a disconnecting switch is also required to be arranged for the direct current bus to completely cut off the circuit, and the safety of maintenance personnel is ensured.
In the related art, a mechanical limit normally closed contact is generally connected in series in a control circuit, when a switch is closed or opened in place, a transmission mechanism touches the mechanical limit normally closed contact to disconnect the mechanically limit normally closed contact, and a coil of the control circuit loses power to stop a driving motor of a direct current bus isolating switch. Although the control mode is simple, after the mechanical limit is used for a long time, the phenomena of oxidation of a mechanical limit contact, dust entering the middle of the contact, performance degradation of a contact spring and the like easily exist, the results of overlarge contact resistance of the contact, insensitive action, low control precision, inaccurate background signals and the like are easily caused, a control loop cannot be effectively disconnected when a switch is switched on or switched off in place, a driving motor cannot accurately stop running, and finally the phenomena of reduction gearbox damage, overload of the driving motor and the like are caused.
In the control circuit 100 of the dc bus isolation switch 200, when the proximity switch SQ detects that the dc bus isolation switch 200 is switched on or switched off in place, the proximity switch outputs a control signal to the control circuit 12 to control the main circuit 11 to be switched off, so as to stop the operation of the driving motor 300. The control mode uses the proximity switch SQ to detect whether the switching-on or the switching-off of the direct current bus isolating switch 200 is in place, is more reliable compared with a mode of using a mechanical limit control contact to break, and can effectively avoid the problems of oxidation and performance degradation of a mechanical structure in the mechanical limit control mode, thereby accurately controlling the driving motor 300 to stop working after the switching-on or the switching-off of the direct current bus isolating switch 200 is completed, and playing a role in protecting the driving motor 300 and a reduction gearbox connected with the driving motor 300.
Specifically, in an embodiment of the present invention, the dc bus isolation switch 200 may include a transmission mechanism, and the driving motor 300 drives the transmission mechanism to move, so as to implement switching on and switching off of the dc bus isolation switch 200.
Under the condition that the direct current bus isolating switch 200 is switched on in place, the transmission mechanism can enter a sensing range of the proximity switch SQ, the proximity switch SQ outputs a control signal, and the control signal controls the driving motor 300 to stop working. Under the condition that the direct current bus isolating switch 200 is in place, the transmission structure can also enter the sensing range of the proximity switch SQ, the proximity switch SQ outputs a control signal, and the control signal controls the driving motor 300 to stop working.
It is understood that in the embodiment of the present invention, the number of the proximity switches SQ may be at least two, and the proximity switches SQ are respectively used for detecting the closing in-position condition and the opening in-position condition of the dc bus isolation switch 200.
In embodiments of the present invention, the proximity switch SQ may include an inductive proximity switch, a capacitive proximity switch, a hall proximity switch, an infrared proximity switch, and the like. In the illustrated embodiment, the proximity switch SQ is an inductive proximity switch. Specifically, the inductive proximity switch includes an oscillator composed of an inductor and a transistor, and generates an alternating magnetic field. When a conductive metal (transmission structure) approaches the alternating magnetic field, eddy current is generated inside the conductive metal, so that oscillation of the oscillator is stopped, the change is amplified by an amplifying circuit in the inductive proximity switch and then converted into a transistor switching signal to be output, and the transistor switching signal is understood to be the control signal.
Referring to fig. 1 to 4, in some embodiments, the main circuit 11 includes a first contactor KM1 and a second contactor KM2, and the first contactor KM1 and the second contactor KM2 are connected to the driving motor 300. When the normally open contact KM11 of the first contactor KM1 is electrified and closed, the driving motor 300 rotates forward to drive the DC bus disconnecting switch 200 to close. When the normally open contact KM21 of the second contactor KM2 is electrically closed, the driving motor 300 rotates reversely to drive the DC bus isolation switch 200 to open. The control signal of the proximity switch SQ is used for controlling the normally open contact KM11 of the first contactor KM1 to be disconnected in a power-off mode and/or controlling the normally open contact KM21 of the second contactor KM2 to be disconnected in a power-off mode, so that the main circuit 11 is disconnected, and the driving motor 300 stops working.
Therefore, the driving motor 300 can be driven to be switched on or switched off by forward rotation or reverse rotation under the condition that the normally open contact KM11 of the first contactor KM1 and the normally open contact KM21 of the second contactor KM2 are powered on and closed respectively, and meanwhile, the normally open contact KM11 of the first contactor KM1 and the normally open contact KM21 of the second contactor KM2 can be further powered off and disconnected by a control signal of a proximity switch SQ so as to control the driving motor 300 to stop working, and the control mode is simple and efficient.
Specifically, with reference to fig. 2, after the air switch QF connected to the power supply is closed, in the closing process of the dc bus isolation switch 200, the three normally open contacts KM11 of the first contactor KM1 are electrically closed, the three normally open contacts KM21 of the second contactor KM2 are kept open, the driving motor 300 is wired in the phase sequence of ABC from top to bottom, and the driving motor 300 starts to rotate forward to drive the dc bus isolation switch 200 to start closing. In the switching-off process of the direct-current bus isolating switch 200, the three normally-open contacts KM21 of the second contactor KM2 are powered on and closed, the three normally-open contacts KM11 of the first contactor KM1 are kept open, the driving motor 300 is wired in the phase sequence of ACB from top to bottom, and the driving motor 300 starts to work in a reverse rotation mode to drive the direct-current bus isolating switch 200 to start switching-off.
Of course, in other embodiments, forward rotation of the driving motor 300 may drive the dc bus isolation switch 200 to open, and reverse rotation of the driving motor 300 may drive the dc bus isolation switch 200 to close, which is not limited herein.
With continued reference to fig. 2, in some embodiments, the main circuit 11 may further include a thermal relay FR, which is connected in series with the driving motor 300, and the thermal relay FR may be used as an overload protection element of the driving motor 300 to open a normally closed contact FR1 of the thermal relay FR to open the main circuit 11 in case of overload of the motor, so as to protect the driving motor 300.
Referring to fig. 1-4, in some embodiments, the control loop 12 includes a first control loop 121 and a second control loop 122. The first control loop 121 includes a first switch SB1 and a second switch SB 2. The first switch SB1 is connected in series with the coil KM12 of the first contactor KM1, when the first switch SB1 is closed, the coil KM12 of the first contactor KM1 is energized to energize the normally open contact KM11 of the first contactor KM1 to be closed, and the driving motor 300 is driven to rotate forward to drive the direct current bus isolating switch 200 to be switched on. The second switch SB2 is connected in series with the coil KM22 of the second contactor KM2, when the second switch SB2 is closed, the coil KM22 of the second contactor KM2 is powered to close the normally open contact KM21 of the second contactor KM2, and the driving motor 300 rotates reversely to drive the dc bus isolating switch 200 to open. The second control loop 122 comprises the proximity switch SQ, the proximity switch SQ is connected with the first control loop 121, and a control signal output by the proximity switch SQ is used for controlling the first control loop 121 to be opened so as to make the normally open contact KM11 of the first contactor KM1 or the normally open contact KM21 of the second contactor KM2 be electrically disconnected, so that the driving motor 300 stops working.
In this way, the first switch SB1 and the second switch SB2 of the first control circuit 121 may respectively control the driving motor 300 to rotate forward and backward, and the proximity switch SQ of the second control circuit 122 may output a control signal to control the normally open contact KM11 of the first contactor KM1 or the normally open contact KM21 of the second contactor KM2 to be electrically disconnected, so as to control the driving motor 300 to stop working.
Specifically, with continued reference to fig. 3, in the illustrated embodiment, the normally open contact KM11 of the first contactor KM1 is connected in parallel with the first switch SB1, that is, after the first switch SB1 is closed to energize the coil KM12 of the first contactor KM1 so as to energize the normally open contact KM11 of the first contactor KM1, the first switch SB1 may be restored to an open state, and the first contactor KM1 is in a self-locking state. In this way, after the driving motor 300 drives the dc bus isolation switch 200 to start to switch on to the right position, the first switch SB1 does not need to be operated again by a person, and the function of automatically controlling the first control circuit 121 is achieved.
Similarly, the normally open contact KM21 of the second contactor KM2 is connected in parallel with the second switch SB2, that is, after the second switch SB2 is closed to energize the coil KM22 of the second contactor KM2 so as to energize the normally open contact KM21 of the second contactor KM2 to be closed, the second switch SB2 can be restored to an open state, and the second contactor KM2 is in a self-locking state. In this way, after the driving motor 300 drives the dc bus isolation switch 200 to start to switch on until the switch-on is completed, the second switch SB2 does not need to be operated again by a person, and the function of automatically controlling the first control circuit 121 is achieved.
Referring to fig. 1-4, in some embodiments, the first control circuit 121 further includes a first relay KA1, and the second control circuit 122 includes a first proximity switch SQ 1. The normally closed contact KA11 of the first relay KA1 is connected in series with the coil KM12 of the first contactor KM1, and the coil KA12 of the first relay KA1 is connected in series with the first proximity switch SQ 1. When the direct current bus isolating switch 200 is switched on in place, the first proximity switch SQ1 outputs a control signal to control the coil KA12 of the first relay KA1 to be powered on, the normally closed contact KA11 of the first relay KA1 is opened, so that the coil KM12 of the first contactor KM1 is powered off, and the normally open contact KM11 of the first contactor KM1 is powered off to stop the driving motor 300.
In this way, according to the control signal output by the first proximity switch SQ1, the coil KA12 of the first relay KA1 and the normally closed contact KA11 are used to control the coil KM12 of the first contactor KM1 to lose power, so as to control the normally open contact KM11 of the first contactor KM1 to lose power and open, so as to stop the operation of the driving motor 300.
Referring to fig. 3, in some embodiments, the first control loop 121 further includes a first indicator light HR. The first indicator light HR is connected with a normally open contact KA13 of the first relay KA1 in series, and when a coil KA12 of the first relay KA1 is electrified, the normally open contact KA13 of the first relay KA1 is closed to enable the first indicator light HR to work.
So, when driving motor 300 drive direct current bus isolator 200 closes a floodgate and targets in place, coil KA12 of first relay KA1 gets electric and makes normally open contact KA13 of first relay KA1 closed to make first pilot lamp HR work, remind staff direct current bus isolator 200 to close a floodgate and target in place.
Specifically, in some embodiments, the first control loop 121 may also include a first buzzer. First bee calling organ establishes ties with normally open contact KA13, the first pilot lamp HR of first relay KA1, when coil KA12 of first relay KA1 got electric, normally open contact KA13 of first relay KA1 was closed to make first bee calling organ and first pilot lamp HR simultaneous working, suggestion staff direct current bus isolator 200 has put in place through closing a floodgate.
Referring to fig. 1-4, in some embodiments, the first control circuit 121 further includes a second relay KA2, and the second control circuit 122 further includes a second proximity switch SQ 2. The normally closed contact KA21 of the second relay KA2 is connected in series with the coil KM22 of the second contactor KM2, and the coil KA22 of the second relay KA2 is connected in series with the second proximity switch SQ 2. When the direct current bus isolating switch 200 is switched on in place, the second proximity switch SQ2 outputs a control signal to control the coil KA22 of the second relay KA2 to be powered on, the normally closed contact KA21 of the second relay KA2 is opened, so that the coil KM22 of the second contactor KM2 is powered off, and the normally open contact KM21 of the second contactor KM2 is powered off to stop the driving motor 300.
In this way, according to the control signal output by the second proximity switch SQ2, the coil KA22 of the second relay KA2 and the normally closed contact KA21 are used to control the coil KM22 of the second contactor KM2 to lose power, so as to control the normally open contact KM21 of the second contactor KM2 to lose power and open, so as to stop the operation of the driving motor 300.
Specifically, the normally closed contact KA11 of the first relay KA1 and the coil KM12 of the first contactor KM1 may be connected in series with the normally closed contact KM23 of the second contactor KM2, and the normally closed contact KA21 of the second relay KA2 and the coil KM22 of the second contactor KM2 may be connected in series with the normally closed contact KM13 of the first contactor KM 1. That is, after the first switch SB1 is closed, the coil KM12 of the first contactor KM1 is energized to open the normally closed contact KM13 of the first contactor KM1, and similarly, after the second switch SB2 is closed, the coil KM22 of the second contactor KM2 is energized to open the normally closed contact KM23 of the second contactor KM2, so that the driving motor 300 is only in one power-on state of forward rotation or reverse rotation at the same time, and functions to protect the control circuit 100 and the driving motor 300.
Referring to fig. 3, in some embodiments, the first control loop 121 further includes a second indicator light HG. The second indicator lamp HG is connected in series with the normally open contact KA23 of the second relay KA2, and when the coil KA22 of the second relay KA2 is powered, the normally open contact KA23 of the second relay KA2 is closed to enable the second indicator lamp HG to work.
Therefore, when the driving motor 300 drives the direct-current bus isolating switch 200 to be opened in place, the coil KA22 of the second relay KA2 is electrified to enable the normally open contact KA23 of the second relay KA2 to be closed, so that the second indicator lamp HG works to remind a worker that the direct-current bus isolating switch 200 is opened in place.
Specifically, the first control loop 121 may further include a second buzzer. The second buzzer is connected with the normally open contact KA23 and the second indicator light HG of the second relay KA2 in series, and when the coil KA22 of the second relay KA2 is electrified, the normally open contact KA23 of the second relay KA2 is closed, so that the second buzzer and the second indicator light HG work simultaneously, and the direct-current bus isolating switch 200 of a worker is prompted to be in place through brake separation.
Referring to fig. 5-7, in some embodiments, a rectification system may include a rectification system a cabinet and a rectification system B cabinet. At the positive pole and the negative pole of the direct current bus of the rectification system A cabinet, a first driving motor 1M drives a positive direct current bus isolating switch 200 to be switched on and switched off, and a second driving motor 2M drives a negative direct current bus isolating switch 200 to be switched on and switched off. At the positive pole and the negative pole of the direct current bus of the B cabinet of the rectification system, a third driving motor 3M drives the positive direct current bus isolating switch 200 to be switched on and switched off, and a fourth driving motor 4M drives the negative direct current bus isolating switch 200 to be switched on and switched off.
It should be noted that the main circuit 11 and the control circuit 12 for controlling the start and stop of the first driving motor 1M, the second driving motor 2M, the third driving motor 3M, and the fourth driving motor 4M are consistent with the above embodiments, and detailed descriptions thereof are not repeated here.
Referring to fig. 1 and 8, in the control method of the control circuit 100 of the dc bus isolation switch 200 according to the embodiment of the present invention, the dc bus isolation switch 200 is connected to a driving motor 300, the driving motor 300 is used for driving the dc bus isolation switch 200 to switch on and switch off, the control circuit 100 includes a main loop 11 connected to the driving motor 300 and a control loop 12 connected to the main loop 11, and the control loop 12 includes a proximity switch SQ. The control method comprises the following steps:
s10, judging whether the proximity switch SQ acquires a signal or not;
s20, if yes, confirming that the direct current bus isolating switch 200 is in place for switching on or switching off;
s30, the main circuit 11 is controlled to be opened to stop the operation of the drive motor 300.
In the control circuit 100 of the dc bus isolation switch 200, when the proximity switch SQ detects that the dc bus isolation switch 200 is switched on or switched off in place, the proximity switch outputs a control signal to the control circuit 12 to control the main circuit 11 to be switched off, so as to stop the operation of the driving motor 300. The control mode uses the proximity switch SQ to detect whether the switching-on or the switching-off of the direct current bus isolating switch 200 is in place, is more reliable compared with a mode of using a mechanical limit control contact to break, and can effectively avoid the problems of oxidation and performance degradation of a mechanical structure in the mechanical limit control mode, thereby accurately controlling the driving motor 300 to stop working after the switching-on or the switching-off of the direct current bus isolating switch 200 is completed, and playing a role in protecting the driving motor 300 and a reduction gearbox connected with the driving motor 300.
Referring to fig. 9, in some embodiments, the main circuit 11 includes a contactor connected in series with the driving motor, and the driving motor is powered to operate when the normally open contacts of the contactor are electrically closed. The step of controlling the main circuit 11 to be opened to stop the operation of the driving motor 300 includes:
and S31, controlling the normally open contact of the contactor to be powered off and disconnected so as to stop the driving motor 300.
Therefore, the normally open contact of the control contactor is disconnected in a power-off mode to control the driving motor 300 to stop working, and the control mode is safe and efficient and high in reliability.
Referring to fig. 10, in some embodiments, the control circuit 12 includes a relay having a normally closed contact in series with a coil of the contactor, the coil of the relay being in series with the proximity switch SQ. The step of controlling the normally open contact of the contactor to be electrically disconnected so as to stop the operation of the driving motor 300 includes:
and S311, controlling the coil of the relay to be electrified so as to break the normally closed contact of the relay, and accordingly, enabling the normally open contact of the contactor to be disconnected in a power-off mode so as to stop the driving motor 300.
Therefore, the normally closed contact of the relay can be disconnected by controlling the power on of the coil of the relay, so that the coil of the contactor is controlled to lose power, the normally open contact of the contactor is disconnected by losing power, and finally the driving motor 300 is controlled to stop working. The on-off of large current is controlled by small current, the control mode is simple and efficient, and the reliability is high.
It is to be understood that the contactors in the control method of the embodiment of the present invention may include the first contactor KM1 and the second contactor KM2 in the foregoing embodiment, the relays may include the first relay KA1 and the second relay KA2 in the foregoing embodiment, and the proximity switch SQ may include the first proximity switch SQ1 and the second proximity switch SQ2 in the foregoing embodiment.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A control circuit of a direct current bus isolating switch, wherein the direct current bus isolating switch is connected with a driving motor, and the driving motor is used for driving the closing and opening of the direct current bus isolating switch, and the control circuit comprises:
a main loop connected with the driving motor;
and the control loop comprises a proximity switch, and the proximity switch is used for outputting a control signal to control the main loop to be disconnected when the direct current bus isolating switch is switched on in place and/or switched off in place so as to stop the driving motor.
2. The control circuit according to claim 1, wherein the main circuit comprises a first contactor and a second contactor, the first contactor and the second contactor are both connected with the driving motor, when a normally open contact of the first contactor is electrically closed, the driving motor rotates forwards to drive the direct current bus disconnecting switch to be switched on, and when a normally open contact of the second contactor is electrically closed, the driving motor rotates backwards to drive the direct current bus disconnecting switch to be switched off;
the control signal of the proximity switch is used for controlling the normally open contact of the first contactor to be disconnected in a power-off mode and/or controlling the normally open contact of the second contactor to be disconnected in a power-off mode, so that the main loop is disconnected, and the driving motor stops working.
3. The control circuit of claim 2, wherein the control loop comprises a first control loop and a second control loop, the first control loop comprising a first switch and a second switch;
the first switch is connected with a coil of the first contactor, when the first switch is closed, the coil of the first contactor is electrified to enable a normally open contact of the first contactor to be electrified and closed, and the driving motor rotates forwards to drive the direct-current bus isolating switch to be switched on;
the second switch is connected with a coil of the second contactor, when the second switch is closed, the coil of the second contactor is electrified to enable a normally open contact of the second contactor to be electrified and closed, and the driving motor rotates reversely to drive the direct-current bus isolating switch to be switched off;
the second control loop comprises the proximity switch, the proximity switch is connected with the first control loop, and a control signal output by the proximity switch is used for controlling the first control loop to be disconnected so as to enable the normally open contact of the first contactor and/or the second contactor to be disconnected in a power failure mode, so that the driving motor stops working.
4. The control circuit of claim 3, wherein the first control circuit comprises a first relay, the second control circuit comprises a first proximity switch, a normally closed contact of the first relay is connected in series with a coil of the first contactor, the coil of the first relay is connected in series with the first proximity switch, when the direct-current bus isolating switch is switched on, the first proximity switch outputs a control signal to control the coil of the first relay to be electrified, the normally closed contact of the first relay is opened, so that the coil of the first contactor is electrified, and the normally open contact of the first contactor is electrified and opened to stop the driving motor.
5. The control circuit of claim 4, wherein the first control loop further comprises a first indicator light in series with the normally open contact of the first relay, wherein when the coil of the first relay is energized, the normally open contact of the first relay closes to operate the first indicator light.
6. The control circuit of claim 4, wherein the first control circuit further comprises a second relay, the second control circuit further comprises a second proximity switch, a normally closed contact of the second relay is connected in series with a coil of the second contactor, the coil of the second relay is connected in series with the second proximity switch, when the DC bus isolation switch is switched on in place, the second proximity switch outputs a control signal to control the coil of the second relay to be powered on, the normally closed contact of the second relay is opened, so that the coil of the second contactor is powered off, and the normally open contact of the second contactor is powered off to stop the driving motor.
7. The control circuit of claim 6, wherein the first control loop further comprises a second indicator light in series with the normally open contact of the second relay, wherein when the coil of the second relay is energized, the normally open contact of the second relay closes to operate the second indicator light.
8. A control method of a control circuit of a direct current bus isolating switch is characterized in that the control circuit comprises a main loop and a control loop, wherein the main loop is connected with the driving motor, the control loop is connected with the main loop, and the control loop comprises a proximity switch;
the control method comprises the following steps:
judging whether the proximity switch acquires a signal or not;
if so, confirming that the direct current bus disconnecting switch is switched on in place or switched off in place;
and controlling the main loop to be disconnected so as to stop the driving motor.
9. The control method of claim 8, wherein the main circuit includes a contactor connected in series with the drive motor, the drive motor being energized for operation when normally open contacts of the contactor are electrically closed, the step of controlling the main circuit to open to deactivate the drive motor comprising:
and controlling the normally open contact of the contactor to be disconnected in a power failure mode so as to stop the driving motor.
10. The control method of claim 9, wherein the control circuit includes a relay having a normally closed contact in series with a coil of the contactor, the coil of the relay in series with the proximity switch;
the step of controlling the normally open contact of the contactor to be disconnected in a power-off mode so as to stop the driving motor comprises the following steps:
and controlling the coil of the relay to be electrified so as to break the normally closed contact of the relay, so that the normally open contact of the contactor is disconnected in a power-off mode, and the driving motor stops working.
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| CN202010802696.5A CN112104266A (en) | 2020-08-11 | 2020-08-11 | Control circuit and control method of direct-current bus isolating switch |
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| CN202010802696.5A CN112104266A (en) | 2020-08-11 | 2020-08-11 | Control circuit and control method of direct-current bus isolating switch |
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