CN110138076B - Two-incoming-line one-bus-connection automatic switching control system and method - Google Patents
Two-incoming-line one-bus-connection automatic switching control system and method Download PDFInfo
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- CN110138076B CN110138076B CN201910365053.6A CN201910365053A CN110138076B CN 110138076 B CN110138076 B CN 110138076B CN 201910365053 A CN201910365053 A CN 201910365053A CN 110138076 B CN110138076 B CN 110138076B
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- 238000004146 energy storage Methods 0.000 claims description 34
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- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 12
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Classifications
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
A two-inlet-wire one-bus-connection automatic switching control system and method comprise a first inlet wire cabinet, a second inlet wire cabinet, a bus-connection cabinet and a PLC module. The first inlet wire cabinet, the second inlet wire cabinet and the bus-bar cabinet respectively output a first state signal, a second state signal and a third state signal, the PLC module monitors the power supply condition of the first path of commercial power and the second path of commercial power in real time, and correspondingly selects and controls the first inlet wire cabinet and the second inlet wire cabinet to work, or controls the bus-bar cabinet and the first inlet wire cabinet to work. According to the system and the method for automatically switching the two-wire-inlet and one-bus-connection, the working conditions of the first wire-inlet cabinet, the second wire-inlet cabinet and the bus-connection cabinet are monitored in real time through the PLC module, when one wire-inlet cabinet cannot supply power, the bus-connection cabinet is controlled to work in time, so that an electric signal in the power-supply wire-inlet cabinet is shunted into the wire-inlet cabinet which cannot supply power, the problem of manpower waste caused by the need of personnel guard is avoided, and the problem of misoperation or inactivity when automatic switching is realized by adopting a relay is solved.
Description
Technical Field
The invention belongs to the technical field of power distribution systems, and particularly relates to a two-incoming-line one-bus automatic switching control system and method.
Background
In the low-voltage distribution technology, a two-wire and one-bus power supply mode is generally adopted. The two incoming lines are connected in a bus way, namely two incoming line cabinets are arranged in the system, each incoming line cabinet is connected with one line of mains supply through a transformer, and meanwhile, a certain number of loads are connected; a bus-bar cabinet is arranged between the two incoming line cabinets.
At present, a power supply system of a two-inlet-wire one-bus-connection is usually in a manual switching mode or in an automatic relay switching mode, so that when one of two lines of mains supply fails, the normal working mains supply is led out to an inlet wire cabinet with the failure of the mains supply through the bus-connection cabinet in time, and the load connected with the two inlet wire cabinets can work normally. However, the manual switching method needs to be performed manually, so that 24 hours of people are required to be on duty in a power distribution room, and manpower is wasted; the automatic switching mode of the relay has the risk of misoperation or non-operation due to instability of the relay and rapid aging of a coil of the relay in a long-term electrified working state.
Therefore, the conventional technical scheme of switching or automatic switching of relays has the problems that the switching needs to be performed manually, the power distribution room needs to be attended by a person, and the risk of misoperation or inactivity exists.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a two-wire-in-one bus-tie automatic switching control system and method, which aim to solve the problems that manual operation is needed, personnel in a power distribution room are needed to be attended, and risks of misoperation or inactivity exist in the traditional manual switching or relay automatic switching technical scheme.
A first aspect of the embodiment of the present invention provides a two-wire-in-one bus-tie automatic switching control system, including:
the first line inlet cabinet is connected with the first line commercial power and is configured to supply power to the first load outlet cabinet and output a first state signal; the first state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the first incoming cabinet;
the second line inlet cabinet is connected with a second line commercial power and is configured to supply power to the second load outlet cabinet and output a second state signal; the second state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the second incoming line cabinet;
The bus-bar cabinet is connected with the first wire inlet cabinet and the second wire inlet cabinet and is configured to output a third state signal; the third state signal represents the working state, the fault state and the energy storage state of the bus-tie cabinet; and
The system comprises a first inlet wire cabinet, a second inlet wire cabinet and a bus-bar cabinet, wherein the first inlet wire cabinet, the second inlet wire cabinet and the bus-bar cabinet are connected, and the system is configured to monitor the working conditions of the first inlet wire cabinet and the second inlet wire cabinet in real time according to the first state signal, the second state signal and the third state signal, and respectively control the first inlet wire cabinet to supply power to the first load outlet wire cabinet and the second inlet wire cabinet to supply power to the second load outlet wire cabinet when the first inlet wire cabinet and the second inlet wire cabinet are powered; or when the first incoming line cabinet cannot supply power, respectively controlling the operation of the bus-tie cabinet and the second incoming line cabinet to lead the second path of commercial power out of the second incoming line cabinet to the first load outgoing line cabinet; or when the second incoming line cabinet cannot supply power, the master connection cabinet and the first incoming line cabinet are respectively controlled to work, so that the first path of commercial power is led out from the first incoming line cabinet to the PLC module of the second load outgoing line cabinet.
The second aspect of the embodiment of the invention provides a two-incoming-line one-bus automatic switching control method, which comprises the following steps:
Accessing a first line inlet cabinet to a first line of commercial power, supplying power to a first load outlet cabinet, and outputting a first state signal; the first state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the first incoming cabinet;
a second incoming line cabinet is used for accessing a second path of commercial power, supplying power to a second load outgoing line cabinet, and outputting a second state signal; the second state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the second incoming line cabinet;
outputting a third state signal by adopting a bus-bar cabinet; the third state signal represents the working state, the fault state and the energy storage state of the bus-tie cabinet;
the PLC module is used for monitoring the working conditions of the first incoming line cabinet and the second incoming line cabinet in real time according to the first state signal, the second state signal and the third state signal, and respectively controlling the first incoming line cabinet to supply power to the first load outgoing line cabinet and the second incoming line cabinet to supply power to the second load outgoing line cabinet when the first incoming line cabinet and the second incoming line cabinet are powered; or when the first incoming line cabinet cannot supply power, respectively controlling the operation of the bus-tie cabinet and the second incoming line cabinet to lead the second path of commercial power out of the second incoming line cabinet to the first load outgoing line cabinet; or when the second incoming line cabinet cannot supply power, the bus-tie cabinet and the first incoming line cabinet are respectively controlled to work so as to lead the first path of commercial power out of the first incoming line cabinet to the second load outgoing line cabinet.
According to the system and the method for controlling the automatic switching of the two-wire-inlet and one-bus-connection, the working conditions of the first wire-inlet cabinet, the second wire-inlet cabinet and the bus-connection cabinet are monitored in real time through the PLC module, when one wire-inlet cabinet cannot supply power, the bus-connection cabinet is controlled to work in time, so that an electric signal in the wire-inlet cabinet which supplies power is shunted into the wire-inlet cabinet which cannot supply power, the problem of manpower waste caused by the need of personnel guard is avoided, and the problem of misoperation or inactivity existing when the relay is adopted to realize automatic switching is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a two-wire-in-one bus automatic switching control system according to an embodiment of the present invention;
FIG. 2 is an exemplary circuit diagram of a PLC module in the two-wire-in-one bus automatic switching control system shown in FIG. 1;
FIG. 3 is an exemplary circuit diagram of a first incoming line cabinet in the two incoming line-bus automatic switching control system shown in FIG. 1;
FIG. 4 is an exemplary circuit diagram of a second incoming line cabinet in the two incoming line-bus automatic switching control system shown in FIG. 1;
FIG. 5 (a) is an electrical connection diagram of a first incoming cabinet, a second incoming cabinet and a bus-tie cabinet in the two incoming and bus-tie automatic switching control system shown in FIG. 1;
FIG. 5 (b) is an exemplary circuit diagram of a master batch cabinet in the two-wire-in-one master batch automatic switching control system shown in FIG. 1;
Fig. 6 is a specific flowchart of a two-wire-in-one bus automatic switching control method according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a schematic block diagram of a two-wire-in-one bus automatic switching control system according to an embodiment of the present invention is shown, for convenience of explanation, only the portions related to the embodiment are shown, and the details are as follows:
A first aspect of the embodiment of the present invention provides a two-wire-in-one bus-tie automatic switching control system, which includes a first wire-in cabinet 100, a second wire-in cabinet 200, a bus-tie cabinet 300, and a PLC module 400.
The first incoming line cabinet 100 is connected to a first path of commercial power, and is configured to supply power to the first load outgoing line cabinet and output a first state signal.
Specifically, the first status signal characterizes an operational status, a fault status, an energy storage status, and a voltage signal status of the first incoming line cabinet 100. The first incoming line cabinet 100 comprises a first breaker 1QF, when the first breaker 1QF is closed, the first line mains supply is allowed to be input into the first incoming line cabinet 100 through the first transformer T1, and the working state of the first incoming line cabinet 100 represents the on-off state of the first breaker 1 QF.
The second incoming line cabinet 200 is connected to a second line of mains electricity, and is configured to supply power to the second load outgoing line cabinet and output a second status signal.
Specifically, the second status signal characterizes an operational status, a fault status, an energy storage status, and a voltage signal status of the second incoming cabinet 200. The second incoming line cabinet 200 comprises a second breaker 2QF, when the second breaker 2QF is closed, the second line mains supply is allowed to be input into the second incoming line cabinet 200 through the second transformer T2, and the working state of the second incoming line cabinet 200 indicates the on-off state of the second breaker 2 QF.
The bus bar 300 is connected to the first and second incoming line cabinets 100 and 200 and configured to output a third status signal.
Specifically, the third status signal characterizes the operational status, the fault status, and the energy storage status of the master batch 300. The master batch 300 includes a third breaker 3QF, and when the third breaker 3QF is closed, the master batch 300 operates.
The PLC module 400 is connected to the first incoming line cabinet 100, the second incoming line cabinet 200, and the bus bar cabinet 300, and is configured to monitor the working conditions of the first incoming line cabinet 100 and the second incoming line cabinet 200 in real time according to the first status signal, the second status signal, and the third status signal, and when both the first incoming line cabinet 100 and the second incoming line cabinet 200 supply power, respectively control the first incoming line cabinet 100 to supply power to the first load outgoing line cabinet and the second incoming line cabinet 200 to supply power to the second load outgoing line cabinet; or when the first incoming line cabinet 100 cannot supply power, the bus-tie cabinet 300 and the second incoming line cabinet 200 are respectively controlled to work so as to lead the second path of commercial power from the second incoming line cabinet 200 to the first load outgoing line cabinet; or when the second incoming line cabinet 200 cannot supply power, the bus-tie cabinet 300 and the first incoming line cabinet 100 are controlled to work respectively so as to lead the first path of commercial power from the first incoming line cabinet 100 to the second load outgoing line cabinet.
Alternatively, the PLC module 400 is implemented using a PLC controller. The PLC controller is convenient to use, simple in programming, high in reliability and high in anti-interference capability, and the traditional relay control system uses a large number of intermediate relays and time relays and is easy to fail due to poor contact. The PLC controller replaces a large number of intermediate relays and time relays by software, only a small number of hardware elements related to input and output are left, wiring can be reduced to 1% -10% of a relay control system, and faults caused by poor contact points are reduced. The PLC controller adopts a series of hardware and software anti-interference measures, has strong anti-interference capability, and has an average fault-free time of tens of thousands of hours.
The two inlet wires one female automatic switching control system that allies oneself with, through the working condition of PLC module 400 real-time supervision first inlet wire cabinet 100, second inlet wire cabinet 200 and female allies oneself with cabinet 300, when one of them inlet wire cabinet can't supply power, in time control female allies oneself with cabinet 300 work to in the inlet wire cabinet that can't supply power with the electric signal reposition of redundant personnel in the inlet wire cabinet of supplying power, avoided the problem of the extravagant manpower that needs special personnel to lead to, and solved the malfunction or the problem of not acting that exist when adopting the relay to realize automatic switching.
Referring to fig. 2, an exemplary circuit diagram of the PLC module 400 in the two-wire one-bus automatic switching control system shown in fig. 1 is shown, for convenience of explanation, only the portions related to the present embodiment are shown, and the details are as follows:
in an alternative embodiment, the PLC module 400 includes an input unit 401, an output unit 402, and a power supply unit.
The input unit 401 is connected to the first incoming line cabinet 100, the second incoming line cabinet 200 and the bus bar cabinet 300, and is configured to receive the first status signal, the second status signal and the third status signal.
Specifically, the first status signal includes a first stored energy signal, a first switch signal, a first fault signal, and a first transfer switch position signal; the second state signal comprises a second energy storage signal, a second switch signal, a second fault signal and a second transfer switch position signal; the third status signal includes a third stored energy signal, a third switch signal, a third fault signal, and a third transfer switch position signal.
The output unit 402 is connected to the first incoming line cabinet 100, the second incoming line cabinet 200 and the bus bar cabinet 300, and is configured to output control signals to control the working states of the first incoming line cabinet 100, the second incoming line cabinet 200 and the bus bar cabinet 300, respectively.
Specifically, the control signals include a signal for controlling the first circuit breaker 1QF of the first incoming line cabinet 100 to open or close, a signal for controlling the second circuit breaker 2QF of the second incoming line cabinet 200 to open or close, and a signal for controlling the third circuit breaker 3QF of the bus bar cabinet 300 to open or close.
The power supply unit is configured to supply power to the input unit 401 and the output unit 402.
Optionally, the input unit 401 includes a first tank signal input 10, a first switch signal input 11, a first fault signal input 12, a first switch position signal input 13, a second tank signal input 15, a second switch signal input 16, a second fault signal input 17, a second switch position signal input 18, a third tank signal input 110, a third switch signal input 111, a third fault signal input 112, and a third switch position signal input 113.
The first energy storage signal input end 10, the first switch signal input end 11, the first fault signal input end 12 and the first switch position signal input end 13 are connected with the first incoming line cabinet 100, and respectively receive the first energy storage signal, the first switch signal, the first fault signal and the first switch position signal output by the first incoming line cabinet 100.
The second energy storage signal input end 15, the second switch signal input end 16, the second fault signal input end 17 and the second change-over switch position signal input end 18 are connected to the second incoming line cabinet 200, and respectively receive the second energy storage signal, the second switch signal, the second fault signal and the second change-over switch position signal output by the second incoming line cabinet 200.
The third energy storage signal input end 110, the third switch signal input end 111, the third fault signal input end 112 and the third change-over switch position signal input end 113 are connected to the bus-tie cabinet 300, and respectively receive the third energy storage signal, the third switch signal, the third fault signal and the third change-over switch position signal output by the bus-tie cabinet 300.
Optionally, the output unit 402 includes a first intermediate relay KA11, a second intermediate relay KA12, a third intermediate relay KA13, and a fourth intermediate relay KA14.
Specifically, the first intermediate relay KA11 includes a first coil and a first normally open contact, the second intermediate relay KA12 includes a second coil and a second normally open contact, the third intermediate relay KA13 includes a third coil and a third normally open contact, and the fourth intermediate relay KA14 includes a fourth coil and a fourth normally open contact.
The first end of the first coil, the first end of the second coil, the first end of the third coil and the first end of the coil of the fourth intermediate relay KA14 are all connected with the bus bar 300; the second end of the first coil is connected with the first incoming line cabinet 100, the second end of the second coil is connected with the second incoming line cabinet 200, and the second end of the third coil and the second end of the fourth coil are connected with the bus-tie cabinet 300.
The first normally open contact is connected with the first incoming cabinet 100; the second normally open contact is connected with the second incoming cabinet 200; the third and fourth normally open contacts are connected to the master batch 300.
Specifically, the switching-on loop of the first normally open contact, which is connected to the first incoming line cabinet 100, is connected in parallel with the first switching-on button SBC1, and when the first coil of the first intermediate relay KA11 is electrically attracted, the first normally open contact is closed, and the first circuit breaker 1QF of the first incoming line cabinet 100 is switched on. The closing loop of the second normally open contact, which is connected with the second incoming line cabinet 200, is connected with the second closing button SBC2 in parallel, and when the second coil of the second intermediate relay KA12 is electrified and sucked, the second normally open contact is closed, and the second breaker 2QF of the second incoming line cabinet 200 is closed. The third normally open contact is connected with a closing loop of the bus-bar cabinet 300 and is connected with a third closing button SBC3 in parallel, and when the third coil of the third intermediate relay KA13 is electrified and sucked, the third normally open contact is closed, and the third breaker 3QF of the bus-bar cabinet 300 is closed; the fourth normally open contact is connected with the brake release loop of the bus-bar cabinet 300 and is connected with the third brake release button SBS3 in parallel, and when the four coils of the fourth intermediate relay KA14 are electrified and sucked, the fourth normally open contact is closed, and the third breaker 3QF of the bus-bar cabinet 300 is operated for brake release.
Referring to fig. 3, an exemplary circuit diagram of the first incoming line cabinet 100 in the two incoming line-bus automatic switching control system shown in fig. 1 is shown, for convenience of explanation, only the portions related to the present embodiment are shown, and the details are as follows:
In an alternative embodiment, the first incoming cabinet 100 includes a first fuse 1FU, a first switch 1SA, a fifth intermediate relay 1KA1, a first circuit breaker 1QF, a first switch-on button SBC1, a first switch-off button SBS1, a first switch-on indicator HR1, and a first switch-off indicator HG1.
Specifically, the first changeover switch 1SA includes manual, stop, and automatic position options. When the first transfer switch 1SA is in an automatic position option (the third contact 3 and the fourth contact 4 of the first transfer switch 1SA are communicated), the PLC module 400 operates, and when the PLC module 400 outputs a control signal to the first incoming line cabinet 100, the first normally open contact of the first intermediate relay KA11 is closed, and the first circuit breaker 1QF is automatically closed. When the first switch 1SA is in the manual position option (the first contact 1 and the second contact 2 of the first switch 1SA are communicated), the PLC module 400 does not work, and the first switch-on button SBC1 needs to be manually pressed to switch on, or the first switch-off button SBS1 needs to be manually pressed to switch off.
The fifth intermediate relay 1KA1 includes a fifth coil and a fifth normally open contact.
The first end of the first fuse 1FU is connected with a first path of commercial power, the second end of the first fuse 1FU, the first end of the first closing button SBC1, the first end of the first opening button SBS1 and the PLC module 400 are connected with the first conversion switch 1SA; the second end of the first closing button SBC1 is connected with the second end of the first opening button SBS1 to form a first breaker 1QF; the first end of the first closing indicator lamp HR1 is connected with the first end of the first opening indicator lamp HG1 to form a second end of the first fuse 1FU, and the second end of the first closing indicator lamp HR1 is connected with the second end of the first opening indicator lamp HG1 to form a first breaker 1QF.
The first end of the fifth coil is connected with the second end of the first fuse 1FU, and the second end of the fifth coil is connected with the first breaker 1QF; a first end of the fifth normally open contact is connected to the second end of the first fuse 1FU, and a second end of the fifth normally open contact is connected to the PLC module 400.
Specifically, when the fifth coil of the fifth intermediate relay 1KA1 is electrically attracted, the fifth normally open contact is closed, and the first energy storage signal is output to the PLC module 400. The first fuse 1FU is used to protect the circuitry of the first incoming cabinet 100 from damaging internal components due to abnormally large currents. When the first circuit breaker 1QF is switched on, outputting a first switching signal to the first switching signal input end 11 OF the PLC module 400 through the normally open contact 1QF-OF, wherein the first switching signal is a switching-on signal; when the first breaker 1QF fails, outputting a first failure signal to the first failure signal input end 12 of the PLC module 400 through the normally open contact 1 QF-SDE; when the first changeover switch 1SA is in the automatic position option or in the manual position option, the corresponding first changeover switch position signal is output to the first changeover switch position signal input 13 of the PLC module 400.
Referring to fig. 4, an exemplary circuit diagram of the second incoming line cabinet 200 in the two incoming line-bus automatic switching control system shown in fig. 1 is shown, for convenience of explanation, only the portions related to the present embodiment are shown, and the details are as follows:
In an alternative embodiment, the second incoming cabinet 200 includes a second fuse 2FU, a second switch 2SA, a sixth intermediate relay 2KA1, a second circuit breaker 2QF, a second switch-on button SBC2, a second switch-off button SBS2, a second switch-on indicator HR2, and a second switch-off indicator HG2; the second changeover switch 2SA includes manual, stop and automatic position options.
Specifically, when the second transfer switch 2SA is in the automatic position option (the third contact 3 and the fourth contact 4 of the second transfer switch 2SA are in communication), the PLC module 400 operates. When the PLC module 400 outputs a control signal to the second incoming line cabinet 200, the second normally open contact of the second intermediate relay KA12 is closed, and the second circuit breaker 2QF is automatically closed. When the second switch 2SA is in the manual position option (the first contact 1 and the second contact 2 of the second switch 2SA are connected), the PLC module 400 does not work, and the second switch-on button SBC2 needs to be manually pressed to switch on, or the second switch-off button SBS2 needs to be manually pressed to switch off.
The sixth intermediate relay 2KA1 includes a sixth coil and a sixth normally open contact.
The first end of the second fuse 2FU is connected with a second path of commercial power, the second end of the second fuse 2FU, the first end of the second closing button SBC2, the first end of the second opening button SBS2 and the PLC module 400 are connected with the second change-over switch 2SA; the second end of the second closing button SBC2 is connected with the second end of the second opening button SBS2 to form a second breaker 2QF; the first end of the second closing indicator lamp HR2 is connected with the first end of the second opening indicator lamp HG2 to form a second end of the second fuse 2FU, and the second end of the second closing indicator lamp HR2 is connected with the second end of the second opening indicator lamp HG2 to form a second breaker 2QF.
The first end of the sixth coil is connected with the second end of the second fuse 2FU, and the second end of the sixth coil is connected with the second breaker 2QF; a first end of the sixth normally open contact is connected to a second end of the second fuse 2FU, and a second end of the sixth normally open contact is connected to the PLC module 400.
Specifically, when the sixth coil of the sixth intermediate relay 2KA1 is electrically attracted, the sixth normally open contact is closed, and the second energy storage signal is output to the PLC module 400. The second fuse 2FU is used to protect the circuitry of the second incoming cabinet 200 from damaging internal components due to abnormally high currents. When the second circuit breaker 2QF is closed, outputting a second switching signal to the second switching signal input end 16 OF the PLC module 400 through the normally open contact 1QF-OF, wherein the second switching signal is a closing signal; when the second breaker 2QF fails, outputting a second failure signal to the second failure signal input terminal 17 of the PLC module 400 through the normally open contact 2 QF-SDE; the second switch 2SA outputs a corresponding second switch position signal to the second switch position signal input 18 of the PLC module 400 when it is in the automatic position option or when it is in the manual position option, respectively.
Referring to fig. 5 (a) and 5 (b), fig. 5 (a) is an electrical connection diagram of the first incoming line cabinet 100, the second incoming line cabinet 200 and the bus bar cabinet 300 in the two incoming line-bus automatic switching control system shown in fig. 1, and fig. 5 (b) is an exemplary circuit diagram of the bus bar cabinet 300 in the two incoming line-bus bar automatic switching control system shown in fig. 1, and for convenience of explanation, only the portions related to this embodiment are shown in detail as follows:
In an alternative embodiment, the bus-bar 300 includes a third transfer switch 3SA, a seventh intermediate relay 3KA1, an eighth intermediate relay 3KA2, a ninth intermediate relay 3KA3, a third circuit breaker 3QF, a third switch-on button SBC3, a third switch-off button SBS3, a third switch-on indicator lamp HR3, and a third switch-off indicator lamp HG3.
Specifically, the third changeover switch 3SA includes manual, stop, and automatic position options. When the third transfer switch 3SA is in the automatic position option (the third contact 3 and the fourth contact 4 of the third transfer switch 3SA are in communication), the PLC module 400 operates. When the PLC module 400 outputs a control signal to the master batch 300, the third normally open contact of the third intermediate relay KA13 is closed, and the third circuit breaker 3QF is automatically closed. When the third switch 3SA is in the manual position option (the first contact 1 and the second contact 2 of the third switch 3SA are connected), the PLC module 400 does not work, and the third switch-on button SBC3 needs to be manually pressed to switch on, or the third switch-off button SBS3 needs to be manually pressed to switch off.
The seventh intermediate relay 3KA1 includes a seventh coil and a seventh normally open contact, the eighth intermediate relay 3KA2 includes an eighth coil and an eighth normally open contact, and the ninth intermediate relay 3KA3 includes a ninth coil and a first normally closed contact.
The first end of the eighth coil and the first end of the eighth normally-open contact are connected with the first incoming line cabinet 100, and the first end of the ninth coil and the first end of the first normally-closed contact are connected with the second incoming line cabinet 200; the second end of the eighth coil and the second end of the ninth coil are connected with a zero line; the second end of the eighth normally open contact and the second end of the first normally closed contact are commonly connected as an electrical signal input end of the bus-tie cabinet 300.
The third change-over switch 3SA is connected with the electric signal input end, and the first end of the third switch-on button SBC3, the first end of the third switch-off button SBS3 and the PLC module 400 are connected with the third change-over switch 3SA; the second end of the third closing button SBC3 and the second end of the third opening button SBS3 are connected with a third breaker 3QF; the first end of the third switch-on indicator lamp HR3 is connected with the first end of the third switch-off indicator lamp HG3 to be connected with the electric signal input end, and the second end of the third switch-on indicator lamp HR3 is connected with the second end of the third switch-off indicator lamp HG3 to be connected with the third breaker 3QF.
The first end of the seventh coil is connected with the electric signal input end, and the second end of the seventh coil is connected with the third breaker 3QF; the seventh normally open contact is connected to the PLC module 400.
Specifically, when the seventh coil of the seventh intermediate relay 3KA1 is electrically attracted, the seventh normally open contact is closed, and the third energy storage signal is output to the PLC module 400. When the third circuit breaker 3QF is closed, outputting a third switching signal to the third switching signal input end 111 OF the PLC module 400 through the normally open contact 3QF-OF, wherein the third switching signal is a closing signal; when the third breaker 3QF fails, outputting a third failure signal to the third failure signal input terminal 112 of the PLC module 400 through the normally open contact 3 QF-SDE; when the third switch 3SA is in the automatic position option or in the manual position option, the corresponding third switch position signal is output to the third switch position signal input 113 of the PLC module 400, respectively.
The eighth coil of the eighth intermediate relay 3KA2 is connected between the live wire and the zero wire of the first incoming line cabinet 100, and the eighth normally open contact of the eighth intermediate relay is connected between the electric signal output end of the first incoming line cabinet 100 and the electric signal input end of the bus-tie cabinet 300, when the eighth coil is electrified and attracted, the eighth normally open contact is closed, and the first path of commercial power in the first incoming line cabinet 100 is led into the bus-tie cabinet 300. The ninth coil of the ninth intermediate relay 3KA3 is connected between the live wire and the zero wire of the second incoming wire cabinet 200, the ninth normally open contact of the ninth intermediate relay 3KA3 is connected between the electric signal output end of the ground second incoming wire cabinet and the electric signal input end of the bus-bar cabinet 300, and when the ninth coil is electrified and attracted, the ninth normally open contact is closed to enable the second path of commercial power in the second incoming wire cabinet 200 to be introduced into the bus-bar cabinet 300.
The PLC module monitors the power supply condition of the first path of commercial power and the second path of commercial power, and correspondingly controls the on-off of the eighth intermediate relay and the ninth intermediate relay, so as to control the bus-bar cabinet to obtain power from the path of commercial power with power and supply power to the two load outlet cabinets.
In an alternative embodiment, the PLC module 400 is disposed inside the first incoming line cabinet 100, or may be disposed inside the second incoming line cabinet 200, or may be disposed inside the bus bar cabinet 300.
In an alternative embodiment, the PLC module 400 is implemented using a PLC controller. Specifically, the PLC controller has the following program settings:
When the first breaker 1QF, the second breaker 2QF and the third breaker 3QF are all in the opening state, only any two of the first breaker 1QF, the second breaker 2QF and the third breaker 3QF are allowed to be closed. When the first and second commercial power are powered, the first and second circuit breakers 1QF and 2QF are switched on, and the bus-tie cabinet 300 is switched off. When any one of the first and second circuit breakers 1QF and 2QF fails to cause tripping, the master batch 300 cannot be closed.
When the first change-over switch 1SA, the second change-over switch 2SA and the third change-over switch 3SA are all in manual position options, the first breaker 1QF and the second breaker 2QF can be controlled to be switched on according to actual conditions through manual operation, or the first breaker 1QF and the third breaker 3QF can be controlled to be switched on, or the second breaker 2QF and the third breaker 3QF can be controlled to be switched on.
When the first change-over switch 1SA, the second change-over switch 2SA and the third change-over switch 3SA are all in automatic position options, the PLC controller works and automatically controls the first breaker 1QF and the second breaker 2QF to switch on according to actual conditions, or controls the first breaker 1QF and the third breaker 3QF to switch on, or controls the second breaker 2QF and the third breaker 3QF to switch on, specifically:
when the first and second mains supplies are powered on, the PLC controller outputs a control signal, a first power-on circuit breaker is closed after a first preset time (for example, 5 s) is delayed (for example, the first circuit breaker 1QF is powered on first, then the second circuit breaker 2QF is powered on later relatively), and a second power-on circuit breaker is closed after a second preset time (for example, 5 s) is delayed on the basis of the first preset time (for example, the first circuit breaker 1QF is powered on first, then the second circuit breaker 2QF is powered on later relatively);
when the first line of commercial power has power and the second line of commercial power does not have power, the PLC outputs a control signal, and the third circuit breaker 3QF is closed by delaying for a third preset time (for example, 5 s) so that the first line of commercial power is led into the bus-bar cabinet 300 through the first incoming line cabinet 100, and the first line of commercial power supplies power to the first load outgoing line cabinet and the second load outgoing line cabinet at the same time. When the first mains supply is in a new call, the PLC outputs a control signal, delays a fourth preset time (for example, 5 s) to open the third circuit breaker 3QF, and delays a fifth preset time (for example, 5 s) to control the second circuit breaker 2QF to be closed on the basis of the fourth preset time;
When the second line of commercial power has power and the first line of commercial power does not have power, the PLC outputs a control signal, and the third breaker 3QF is closed by delaying for a sixth preset time (for example, 5 s) so that the second line of commercial power is led into the bus-bar cabinet 300 through the second inlet wire cabinet 200, and the second line of commercial power supplies power to the first load outlet wire cabinet and the second load outlet wire cabinet at the same time. When the first mains supply is re-supplied, the PLC outputs a control signal, delays a seventh preset time (for example, 5 s) to open the third circuit breaker 3QF, and delays an eighth preset time (for example, 5 s) to control the first circuit breaker 1QF to be closed on the basis of the seventh preset time.
Referring to fig. 6, a specific flowchart of a two-wire one-bus automatic switching control method according to another embodiment of the present invention is shown, for convenience of explanation, only the portions related to the embodiment are shown, and the detailed description is as follows:
The second aspect of the embodiment of the invention provides a two-incoming-line one-bus automatic switching control method, which comprises the following steps:
S01: the first incoming line cabinet 100 is used for accessing a first path of commercial power, supplying power to a first load outgoing line cabinet and outputting a first state signal; the first state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the first incoming line cabinet 100;
S02: a second incoming line cabinet 200 is used for accessing a second path of commercial power, supplying power to a second load outgoing line cabinet, and outputting a second state signal; the second state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the second incoming line cabinet 200;
s03: outputting a third state signal by using the bus-bar 300; the third state signal characterizes the working state, the fault state and the energy storage state of the bus-tie cabinet 300;
S04: the working conditions of the first wire inlet cabinet 100 and the second wire inlet cabinet 200 are monitored in real time by adopting the PLC module 400 according to the first state signal, the second state signal and the third state signal, and when the first wire inlet cabinet 100 and the second wire inlet cabinet 200 are powered, the first wire inlet cabinet 100 is controlled to supply power to the first load wire outlet cabinet and the second wire inlet cabinet 200 is controlled to supply power to the second load wire outlet cabinet respectively; or when the first incoming line cabinet 100 cannot supply power, the bus-tie cabinet 300 and the second incoming line cabinet 200 are respectively controlled to work so as to lead the second path of commercial power from the second incoming line cabinet 200 to the first load outgoing line cabinet; or when the second incoming line cabinet 200 cannot supply power, the bus-tie cabinet 300 and the first incoming line cabinet 100 are controlled to work respectively so as to lead the first path of commercial power from the first incoming line cabinet 100 to the second load outgoing line cabinet.
In summary, the invention provides an automatic switching system and method, which monitor the working conditions of a first incoming line cabinet, a second incoming line cabinet and a bus-bar cabinet in real time through a PLC module, and when one of the incoming line cabinets cannot supply power, timely control the bus-bar cabinet to work so as to shunt the electric signal in the supplied incoming line cabinet into the incoming line cabinet which cannot supply power, thereby avoiding the problem of wasting manpower caused by the need of personnel guard, and solving the problem of misoperation or inactivity when the relay is adopted to realize automatic switching.
Various embodiments are described herein for various systems and methods. Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and shown in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the specification. It will be appreciated by persons skilled in the art that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A two inlet wire one female automatic switching control system that allies oneself with, its characterized in that includes:
the first line inlet cabinet is connected with the first line commercial power and is configured to supply power to the first load outlet cabinet and output a first state signal; the first state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the first incoming cabinet;
the second line inlet cabinet is connected with a second line commercial power and is configured to supply power to the second load outlet cabinet and output a second state signal; the second state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the second incoming line cabinet;
The bus-bar cabinet is connected with the first wire inlet cabinet and the second wire inlet cabinet and is configured to output a third state signal; the third state signal represents the working state, the fault state and the energy storage state of the bus-tie cabinet; and
The system comprises a first inlet wire cabinet, a second inlet wire cabinet and a bus-bar cabinet, wherein the first inlet wire cabinet, the second inlet wire cabinet and the bus-bar cabinet are connected, and the system is configured to monitor the working conditions of the first inlet wire cabinet and the second inlet wire cabinet in real time according to the first state signal, the second state signal and the third state signal, and respectively control the first inlet wire cabinet to supply power to the first load outlet wire cabinet and the second inlet wire cabinet to supply power to the second load outlet wire cabinet when the first inlet wire cabinet and the second inlet wire cabinet are powered; or when the first incoming line cabinet cannot supply power, respectively controlling the operation of the bus-tie cabinet and the second incoming line cabinet to lead the second path of commercial power out of the second incoming line cabinet to the first load outgoing line cabinet; or when the second incoming line cabinet cannot supply power, respectively controlling the operation of the bus-tie cabinet and the first incoming line cabinet to lead the first path of commercial power out of the first incoming line cabinet to the PLC module of the second load outgoing line cabinet;
the first incoming line cabinet comprises:
The switching device comprises a first fuse, a first change-over switch, a fifth intermediate relay, a first circuit breaker, a first switching-on button, a first switching-off button, a first switching-on indicator lamp and a first switching-off indicator lamp; the first transfer switch includes manual, stop, and automatic position options; the working state of the first incoming line cabinet is used for representing the on-off state of the first circuit breaker;
The fifth intermediate relay comprises a fifth coil and a fifth normally-open contact;
The first end of the first fuse is connected to the first path of commercial power, the second end of the first fuse, the first end of the first closing button, the first end of the first opening button and the PLC module are connected with the first transfer switch; the second end of the first switch-on button and the second end of the first switch-off button are connected with the first circuit breaker; the first end of the first switch-on indicator lamp is connected with the first end of the first switch-off indicator lamp to be connected with the second end of the first fuse, and the second end of the first switch-on indicator lamp is connected with the second end of the first switch-off indicator lamp to be connected with the first circuit breaker;
A first end of the fifth coil is connected with a second end of the first fuse, and a second end of the fifth coil is connected with the first circuit breaker; and the first end of the fifth normally-open contact is connected with the second end of the first fuse, and the second end of the fifth normally-open contact is connected with the PLC module.
2. The two-wire-in-one bus-tie automatic switching control system according to claim 1, wherein the PLC module comprises:
The input unit is connected with the first incoming line cabinet, the second incoming line cabinet and the bus-tie cabinet and is configured to receive the first state signal, the second state signal and the third state signal;
The output unit is connected with the first wire inlet cabinet, the second wire inlet cabinet and the bus-bar cabinet and is configured to output control signals so as to respectively control the working states of the first wire inlet cabinet, the second wire inlet cabinet and the bus-bar cabinet; and
And a power supply unit configured to supply power to the input unit and the output unit.
3. The two-wire-in-one bus automatic switching control system according to claim 2, wherein the input unit comprises:
The switching device comprises a first energy storage signal input end, a first switch signal input end, a first fault signal input end, a first change-over switch position signal input end, a second energy storage signal input end, a second switch signal input end, a second fault signal input end, a second change-over switch position signal input end, a third energy storage signal input end, a third switch signal input end, a third fault signal input end and a third change-over switch position signal input end;
the first energy storage signal input end, the first switch signal input end, the first fault signal input end and the first transfer switch position signal input end are connected with the first incoming line cabinet;
The second energy storage signal input end, the second switch signal input end, the second fault signal input end and the second change-over switch position signal input end are connected with the second incoming line cabinet;
the third energy storage signal input end, the third switch signal input end, the third fault signal input end and the third transfer switch position signal input end are connected with the bus-bar cabinet.
4. The two-wire-in-one bus automatic switching control system according to claim 2, wherein the output unit comprises:
the first intermediate relay, the second intermediate relay, the third intermediate relay and the fourth intermediate relay;
The first intermediate relay comprises a first coil and a first normally open contact, the second intermediate relay comprises a second coil and a second normally open contact, the third intermediate relay comprises a third coil and a third normally open contact, and the fourth intermediate relay comprises a fourth coil and a fourth normally open contact;
The first end of the first coil, the first end of the second coil, the first end of the third coil and the first end of the coil of the fourth intermediate relay are all connected with the bus-bar cabinet; the second end of the first coil is connected with the first incoming line cabinet, the second end of the second coil is connected with the second incoming line cabinet, and the second end of the third coil and the second end of the fourth coil are connected with the bus-bar cabinet;
the first normally open contact is connected with the first incoming line cabinet; the second normally open contact is connected with the second incoming line cabinet; the third normally open contact and the fourth normally open contact are connected with the bus-bar cabinet.
5. The two-wire-in-one bus-tie automatic switching control system according to claim 1, wherein the second wire-in cabinet comprises:
the switching-on/switching-off device comprises a second fuse, a second change-over switch, a sixth intermediate relay, a second circuit breaker, a second switching-on button, a second switching-off button, a second switching-on indicator lamp and a second switching-off indicator lamp; the second transfer switch comprises manual, stop and automatic position options;
the sixth intermediate relay comprises a sixth coil and a sixth normally open contact;
The first end of the second fuse is connected with the second line of commercial power, the second end of the second fuse, the first end of the second switch-on button, the first end of the second switch-off button and the PLC module are connected with the second change-over switch; the second end of the second switch-on button and the second end of the second switch-off button are connected with the second circuit breaker; the first end of the second switch-on indicator lamp is connected with the first end of the second switch-off indicator lamp to be connected with the second end of the second fuse, and the second end of the second switch-on indicator lamp is connected with the second end of the second switch-off indicator lamp to be connected with the second circuit breaker;
The first end of the sixth coil is connected with the second end of the second fuse, and the second end of the sixth coil is connected with the second circuit breaker; and the first end of the sixth normally open contact is connected with the second end of the second fuse, and the second end of the sixth normally open contact is connected with the PLC module.
6. The two-wire-in-one bus-tie automatic switching control system according to claim 1, wherein the bus-tie cabinet comprises:
The third change-over switch, the seventh intermediate relay, the eighth intermediate relay, the ninth intermediate relay, the third circuit breaker, the third switching-on button, the third switching-off button, the third switching-on indicator lamp and the third switching-off indicator lamp; the third transfer switch comprises manual, stop and automatic position options;
the seventh intermediate relay comprises a seventh coil and a seventh normally open contact, the eighth intermediate relay comprises an eighth coil and an eighth normally open contact, and the ninth intermediate relay comprises a ninth coil and a first normally closed contact;
The first end of the eighth coil and the first end of the eighth normally open contact are connected with the first incoming line cabinet, and the first end of the ninth coil and the first end of the first normally closed contact are connected with the second incoming line cabinet; a second end of the eighth coil and a second end of the ninth coil are connected with a zero line; the second end of the eighth normally-open contact and the second end of the first normally-closed contact are commonly connected to serve as an electric signal input end of the bus-bar cabinet;
the third transfer switch is connected with the electric signal input end, and the first end of the third switch-on button, the first end of the third switch-off button and the PLC module are connected with the third transfer switch; the second end of the third switch-on button and the second end of the third switch-off button are connected with the third circuit breaker; the first end of the third switch-on indicator lamp is connected with the first end of the third switch-off indicator lamp, and the second end of the third switch-on indicator lamp is connected with the second end of the third switch-off indicator lamp;
A first end of the seventh coil is connected with the electric signal input end, and a second end of the seventh coil is connected with the third circuit breaker; and the seventh normally open contact is connected with the PLC module.
7. The two-wire-in-one bus-tie automatic switching control system according to claim 1, wherein the PLC module is disposed inside the first wire-in cabinet or inside the second wire-in cabinet or inside the bus-tie cabinet.
8. The two-wire-in-one bus automatic switching control system according to claim 1, wherein the PLC module is realized by a PLC controller.
9. The two-incoming-line one-bus automatic switching control method is characterized by comprising the following steps of:
Accessing a first line inlet cabinet to a first line of commercial power, supplying power to a first load outlet cabinet, and outputting a first state signal; the first state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the first incoming cabinet;
a second incoming line cabinet is used for accessing a second path of commercial power, supplying power to a second load outgoing line cabinet, and outputting a second state signal; the second state signal represents the working state, the fault state, the energy storage state and the voltage signal state of the second incoming line cabinet;
outputting a third state signal by adopting a bus-bar cabinet; the third state signal represents the working state, the fault state and the energy storage state of the bus-tie cabinet;
The PLC module is used for monitoring the working conditions of the first incoming line cabinet and the second incoming line cabinet in real time according to the first state signal, the second state signal and the third state signal, and respectively controlling the first incoming line cabinet to supply power to the first load outgoing line cabinet and the second incoming line cabinet to supply power to the second load outgoing line cabinet when the first incoming line cabinet and the second incoming line cabinet are powered; or when the first incoming line cabinet cannot supply power, respectively controlling the operation of the bus-tie cabinet and the second incoming line cabinet to lead the second path of commercial power out of the second incoming line cabinet to the first load outgoing line cabinet; or when the second incoming line cabinet cannot supply power, respectively controlling the operation of the bus-tie cabinet and the first incoming line cabinet to lead the first path of commercial power out of the first incoming line cabinet to the second load outgoing line cabinet;
the first incoming line cabinet comprises:
The switching device comprises a first fuse, a first change-over switch, a fifth intermediate relay, a first circuit breaker, a first switching-on button, a first switching-off button, a first switching-on indicator lamp and a first switching-off indicator lamp; the first transfer switch includes manual, stop, and automatic position options; the fifth intermediate relay comprises a fifth coil and a fifth normally-open contact;
The first end of the first fuse is connected to the first path of commercial power, the second end of the first fuse, the first end of the first closing button, the first end of the first opening button and the PLC module are connected with the first transfer switch; the second end of the first switch-on button and the second end of the first switch-off button are connected with the first circuit breaker; the first end of the first switch-on indicator lamp is connected with the first end of the first switch-off indicator lamp to be connected with the second end of the first fuse, and the second end of the first switch-on indicator lamp is connected with the second end of the first switch-off indicator lamp to be connected with the first circuit breaker;
A first end of the fifth coil is connected with a second end of the first fuse, and a second end of the fifth coil is connected with the first circuit breaker; and the first end of the fifth normally-open contact is connected with the second end of the first fuse, and the second end of the fifth normally-open contact is connected with the PLC module.
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| CN117375208B (en) * | 2023-11-01 | 2024-05-24 | 希格玛电气(珠海)有限公司 | Novel control system of automatic switching equipment |
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