CN117439249A - Dual alternating current power supply automatic switching device with power supply priority selection function and operation method - Google Patents
Dual alternating current power supply automatic switching device with power supply priority selection function and operation method Download PDFInfo
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- CN117439249A CN117439249A CN202311273813.3A CN202311273813A CN117439249A CN 117439249 A CN117439249 A CN 117439249A CN 202311273813 A CN202311273813 A CN 202311273813A CN 117439249 A CN117439249 A CN 117439249A
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- 230000009977 dual effect Effects 0.000 title claims description 17
- 238000012544 monitoring process Methods 0.000 claims abstract description 78
- 230000005284 excitation Effects 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 14
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000000428 dust Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- H02J9/062—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 for AC powered loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a double alternating current power supply automatic switching device with power supply preference and an operation method, wherein the device comprises a double alternating current power supply automatic switching box body, two alternating current power supply circuit breakers, two alternating current power supply monitoring relays, a preference power supply switching handle, two power supply self-holding relays, two power supply signal relays, two miniature circuit breakers, two alternating current power supply contactors and two time delay relays, wherein the two alternating current power supply circuit breakers, the two alternating current power supply monitoring relays, the two preference power supply switching handles, the two power supply self-holding relays, the two power supply signal relays, the two miniature circuit breakers, the two alternating current power supply contactors and the two time delay relays are arranged in the device; the lower end of the device is provided with a power terminal for 2 paths of alternating current power input and a power monitoring signal output terminal, the N pole of the relay is externally connected with a terminal, and the device shell is provided with a grounding terminal; the device has solved prior art and has been related to the circuit complicated, occupation space is extremely big, unable problem of selecting priority power supply, has succinct reliable power supply circuit design and makes things convenient for the daily maintenance work advantage, is fit for the characteristics that provide reliable continuity power for important equipment.
Description
Technical Field
The invention belongs to the technical field of power control distribution systems, and particularly relates to a double-alternating-current power source automatic switching device with power source preference.
Background
In the prior art, many power equipment all needs two paths of power input to ensure that equipment can be automatically switched to standby power when main power fails, avoid equipment to shut down and cause unnecessary loss, conventional design adopts a large amount of components to connect in equipment power control cabinet, design return circuit is complicated, occupy in the cabinet terminal row quantity more, the space is great, and easily because certain components are connected unreliable or damage leads to unable realization standby power automatic input function, cause important equipment to cut out. Particularly, in the power industry, if a double-circuit power supply cannot be switched in the transformer control cabinet, a total stop command of the cooler is started after the power supply is in a period of time, so that the tripping of the transformer cannot normally generate power, and an unplanned outage phenomenon is caused.
Aiming at the phenomenon frequently happened in the practical application, the students are researching the device and put forward a plurality of double-power automatic change-over switch researches, however, the double-power automatic change-over device in the prior art has the problems of complex equipment, complex installation and the like, and needs to be further improved. For example, chinese patent application publication No. CN 209641542U discloses a dual-power automatic transfer switch, which mainly includes a box, a first rotating shaft, a second rotating shaft, a telescopic mechanism between the two rotating shafts, a clamping sleeve in a connecting barrel, and the like, and is mainly controlled by adopting a mechanical linkage function. However, due to the numerous mechanical structures in the dual power circuit, metallic grounding is easily caused during use of the power supply. Therefore, it is desirable to design a dual ac power source switching device with power preference and an operating method to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a double alternating current power supply automatic switching device with power supply priority selection and an operation method, and the device solves the problems that a loop is complex, occupied space is extremely large, a priority power supply cannot be selected in the prior art, and has the advantages of simplicity and reliability in power supply loop design, convenience in daily overhaul and maintenance work and reliability in power supply continuity for important equipment.
In order to solve the technical problems, the invention adopts the following technical scheme:
the double alternating current power supply automatic switching device with the power supply priority selection comprises a double alternating current power supply automatic switching box body, wherein the top of the double alternating current power supply automatic switching box body is connected with a power supply output terminal, and the bottom of the double alternating current power supply automatic switching box body is connected with a device N wire and an outgoing signal wiring terminal, a first device power supply inlet wire terminal and a second device power supply inlet wire terminal; the surfaces of two sides of the double alternating current power supply switching box body are respectively provided with holes and shutters, and a device grounding terminal is arranged below the holes; the double-alternating-current power supply automatic switching box body is internally and electrically connected with a first power supply inlet wire alternating-current circuit breaker and a second power supply inlet wire alternating-current circuit breaker.
Further, all other electrical components were connected in the case by 2.5mm2 wires except for the ac power input/output circuit using 6.0mm2 wires.
Further, the hole is a round hole with the diameter of 8cm, and is tightly covered by the hole cover; the shutter is a shutter window of 100cm 2.
Preferably, the input ends of the first power supply inlet wire alternating current circuit breaker and the second power supply inlet wire alternating current circuit breaker are electrically connected with the first device power supply inlet wire terminal and the second device power supply inlet wire terminal through leads; the output ends of the first power supply inlet wire alternating current circuit breaker and the second power supply inlet wire alternating current circuit breaker are respectively and electrically connected with a first contactor and a second contactor through power supply connecting wires, and the first contactor and the second contactor are connected with a power supply output terminal of the device.
Further, the two alternating current circuit breakers have a function of detecting current, and the two alternating current circuit breakers are automatically cut off when the tripping current of the circuit breakers is achieved.
Preferably, the first power supply inlet wire alternating current circuit breaker and the second power supply inlet wire alternating current circuit breaker are connected with the front panel of the device, and the control handle is positioned outside the panel and plays a role of protecting the circuit breaker and is convenient for manual on-site operation.
Preferably, a first path of power supply monitoring relay and a second path of power supply monitoring relay are arranged in the double-alternating-current power supply automatic switching box body; the monitoring input loop of the first path of power supply monitoring relay is electrically connected between the input and the output of the first path of power supply through the first miniature circuit breaker, and the monitoring input loop of the second path of power supply monitoring relay is electrically connected between the input and the output of the second path of power supply through the second miniature circuit breaker.
Further, the two miniature circuit breakers are respectively connected between the two alternating current circuit breakers and the two alternating current contactors, and three-phase power signals of the miniature circuit breakers are sent to the power monitoring relay.
Further, the first path of power supply monitoring relay and the second path of power supply monitoring relay play a role in monitoring the path of power supply, and meanwhile, the normally open auxiliary contact of the first path of power supply monitoring relay and the second path of power supply monitoring relay are matched with the power supply control loop to play a role in controlling and outputting the path of power supply.
Further, the miniature circuit breaker plays a role in protecting an alternating current power supply input loop and preventing a main power supply loop from tripping faults caused by short circuit of a power supply monitoring relay.
Preferably, the power supply inlet wire ends of the first path of power supply monitoring relay and the second path of power supply monitoring relay are respectively connected with the lower ends of the first path of power supply monitoring relay inlet wire micro switch and the second path of power supply monitoring relay inlet wire micro switch, and the upper ends of the first path of power supply monitoring relay inlet wire micro switch and the second path of power supply monitoring relay inlet wire micro switch are respectively connected with the upper ends of the first path of power supply inlet wire alternating current circuit breaker and the second path of power supply inlet wire alternating current circuit breaker in a three-phase manner, so that the three-phase power supply at the upper end of the power supply inlet wire alternating current circuit breaker is led into the power supply monitoring relay.
Preferably, the normally open auxiliary contacts of the first path power supply monitoring relay and the second path power supply monitoring relay are connected with the power supply switching handle which is preferentially selected.
Further, a power supply switching handle is preferentially selected, and the internal contact state after conversion is utilized to be optimally arranged in the integral switching control loop, so that the purpose of selecting which path of alternating current input power supply is specifically required as the input main power supply is achieved.
Preferably, the preferential power supply switching handle is connected with the first device power supply incoming line terminal and the second device power supply incoming line terminal through the first delay switching relay and the second delay switching relay respectively.
Preferably, the power supply switching handle is preferably connected with the first power supply control relay and the second power supply control relay through the first power supply self-retaining relay and the auxiliary contact and the second power supply self-retaining relay and the auxiliary contact respectively, and the first power supply control relay and the second power supply control relay are connected with the first device power supply inlet wire terminal and the second device power supply inlet wire terminal respectively.
Further, the left side panel hole and the shutter of the right side panel are designed aiming at the problems of heating and dust accumulation in the equipment after long-term operation.
Further, the self-use self-relay and the auxiliary contact of the self-hold relay always keep continuous power supply function when the power supply is normal in loop design, and meanwhile, the normally closed auxiliary contact of the other group of power supply contactors is connected in series in the self-hold loop, so that the operation risk of simultaneously supplying power to two groups of power supplies is avoided.
Further, the two ac releases are the final elements of control in the overall design, and when the contactor is energized, the power supply is powered by the important equipment after passing through the circuit breaker and the contact in response to the contact being turned on.
Further, the two ac releases are the final elements of control in the overall design, and when the contactor is energized, the power supply is powered by the important equipment after passing through the circuit breaker and the contact in response to the contact being turned on.
Preferably, the operation method of the double alternating current power supply switching device with power supply preference comprises the following steps:
s1, when a priority power supply selects a 1-path position of a switching handle, and after a first path of power supply monitoring relay detects that the voltage at the outlet of an alternating current breaker of a first path of power supply incoming line is normal, a normally open auxiliary contact of the first path of power supply monitoring relay is matched with a contact point and a single-phase miniature breaker contact point when the priority power supply selects the 1-path position of the switching handle, so that a single-phase positive excitation power supply is provided for a first path of power supply self-holding relay and the auxiliary contact point, and the relay is excited;
s2, after excitation of the first power supply self-holding relay and the auxiliary contact, the normally open auxiliary contact is closed, and then the first power supply control relay loop is conducted, and the three-phase contact of the first contactor is closed after excitation of the relay, so that the first external power supply is used as an output power supply of the device;
s3, the control logic of the second power supply loop and the control logic of the first power supply loop are the same;
s4, applying the first delay switching relay, the second delay switching relay and the auxiliary contact to perform combined action with other components, and completing automatic switching to a standby power supply for power supply through set delay after power failure of a main power supply in two paths of external power supplies, wherein the specific method is as follows:
the first path is selected as a main power supply under the normal condition of two paths of external input power supplies, when the first path of external power supply suddenly disappears, the self-holding relay of the first path of power supply and the normally closed auxiliary contact of the auxiliary contact are closed, and because the normally open contact of the second path of power supply monitoring relay and the second single-phase miniature circuit breaker is in a closed state at this moment, the positive power supply loop of the second delay switching relay is further connected, the internal timer is started after the second delay switching relay is excited, after the set switching time is reached, the normally open auxiliary contact of the second delay switching relay is closed, and because the normally closed contact of the first path of power supply control relay is in a closed state at this moment, the second path of power supply control relay excitation loop is further conducted, the second contactor is closed, and thus the function of switching the second group of power supply into the second group through the delay of the second delay switching relay after the first path of power supply of the main power supply disappears is completed.
The beneficial effects of the invention are as follows:
1, in the design link of important equipment needing to be powered by adopting a dual power supply, the invention greatly saves the design steps of an electric loop and can be realized only by wire connection; the control loop is integrated in the device, so that the installation space of equipment and the use quantity of the terminals in the electrical panel cabinet are greatly saved through reasonable design and configuration;
2, the invention effectively solves the problem that the selected main power supply in the dual-power supply system is automatically switched to the standby power supply after disappearing; the design of the preferential power supply can be selected, so that the purpose of automatically switching back to the power supply of the main power supply in the process of disappearance and resumption of the main power supply is realized;
the auxiliary contact output loop of the power supply monitoring relay can be matched with a monitoring system to realize the purpose of monitoring the power supply state in real time; the auxiliary contact of the power monitoring relay, the auxiliary contact of the miniature circuit breaker, the priority power supply switching handle and other loops are perfectly matched, so that the function of selecting a main power supply is realized;
4, the self-control loop self-holding relay is matched with the auxiliary contact of the other power supply contactor, so that an interlocking effect is achieved, and the effect of avoiding power supply of two paths of power supplies at the same time is achieved; the left side panel hole of the device is designed to facilitate the maintenance personnel to clean the inside of the device, and dust in the device is discharged through the louver on the right side panel by using the air speed and the pressure externally applied by the blower.
Drawings
FIG. 1 is a schematic diagram of a secondary system of internal components of the apparatus of the present invention.
FIG. 2 is a schematic diagram showing the connection of the internal components of the device of the present invention.
Fig. 3 is a front view of the device of the present invention.
Fig. 4 is a schematic view of the structure of the device of the present invention.
In the figure: the power supply system comprises a first power supply inlet alternating current circuit breaker 1, a second power supply inlet alternating current circuit breaker 2, a first power supply monitoring relay 3, a second power supply monitoring relay 4, a priority power supply selection switching handle 5, a first power supply self-holding relay and auxiliary contacts 6, a second power supply self-holding relay and auxiliary contacts 7, a first power supply monitoring relay inlet micro switch 8, a second power supply monitoring relay inlet micro switch 9, a first power supply control relay 10, a second power supply control relay 11, a first delay switching relay 12, a second delay switching relay 13, a first single-phase micro circuit breaker 14, a second single-phase micro circuit breaker 15, a power supply connection wire 16, a first contactor 17, a second contactor 18, a power supply switching device box 19, holes 20, shutters 21, a device grounding terminal 22, a device N line and outgoing signal wiring terminal 23, a first device power supply inlet terminal 24, a second device power inlet terminal 25 and a device power output terminal 26.
Detailed Description
As shown in fig. 1-4, a dual ac power supply automatic switching device with power supply preference selection comprises a dual ac power supply automatic switching box 19, wherein a power supply output terminal 26 is connected to the top of the dual ac power supply automatic switching box 19, and a device N wire and outgoing signal wiring terminal 23, a first device power supply incoming wire terminal 24 and a second device power supply incoming wire terminal 25 are connected to the bottom of the dual ac power supply automatic switching box 19; the surfaces of the two sides of the double alternating current power supply switching box body 19 are respectively provided with a hole 20 and a shutter 21, and a device grounding terminal 22 is arranged below the hole 20; the inside of the double-alternating-current power supply switching box 19 is electrically connected with a first-path power supply incoming line alternating-current circuit breaker 1 and a second-path power supply incoming line alternating-current circuit breaker 2.
Further, all other electrical components were connected in the case by 2.5mm2 wires except for the ac power input/output circuit using 6.0mm2 wires.
Further, the hole 20 is a round hole with the diameter of 8cm, and is tightly covered by a hole cover; shutter 21 is a shutter window of 100cm 2.
Preferably, the input ends of the first power supply inlet wire alternating current circuit breaker 1 and the second power supply inlet wire alternating current circuit breaker 2 are connected with a first device power supply inlet wire terminal 24 and a second device power supply inlet wire terminal 25 through leads; the output ends of the first power supply incoming line alternating current circuit breaker 1 and the second power supply incoming line alternating current circuit breaker 2 are respectively connected with a first contactor 17 and a second contactor 18 through a power connection wire 16, and the first contactor 17 and the second contactor 18 are connected with a device power output terminal 26.
Further, the two alternating current circuit breakers have a function of detecting current, and the two alternating current circuit breakers are automatically cut off when the tripping current of the circuit breakers is achieved.
Preferably, the first power supply inlet wire alternating current circuit breaker 1 and the second power supply inlet wire alternating current circuit breaker 2 are connected with the front panel of the device, and the control handle is positioned outside the panel and plays a role of protecting the circuit breaker and is convenient for manual on-site operation.
Preferably, a first path of power supply monitoring relay 3 and a second path of power supply monitoring relay 4 are arranged in the double-alternating-current power supply automatic switching box 19; the monitoring input loop of the first path of power supply monitoring relay 3 is connected between the input and the output of the first path of power supply through the first miniature circuit breaker 14, and the monitoring input loop of the second path of power supply monitoring relay 4 is electrically connected between the input and the output of the second path of power supply through the second miniature circuit breaker 15.
Further, the two miniature circuit breakers are respectively connected between the two alternating current circuit breakers and the two alternating current contactors, and three-phase power signals of the miniature circuit breakers are sent to the power monitoring relay.
Further, the first path of power supply monitoring relay 3 and the second path of power supply monitoring relay 4 play a role in monitoring the path of power supply, and meanwhile, the normally open auxiliary contact of the first path of power supply monitoring relay is matched with the power supply control loop to play a role in controlling and outputting the path of power supply.
Further, the miniature circuit breaker plays a role in protecting an alternating current power supply input loop and preventing a main power supply loop from tripping faults caused by short circuit of a power supply monitoring relay.
Preferably, the power supply inlet terminals of the first path of power supply monitoring relay 3 and the second path of power supply monitoring relay 4 are respectively connected with the lower ends of the first path of power supply monitoring relay inlet micro switch 8 and the second path of power supply monitoring relay inlet micro switch 9, and the upper ends of the first path of power supply monitoring relay inlet micro switch 8 and the upper ends of the second path of power supply monitoring relay inlet micro switch 9 are respectively connected with the upper ends of the first path of power supply inlet alternating current circuit breaker 1 and the second path of power supply inlet alternating current circuit breaker 2 in a three-phase manner, so that the three-phase power supply at the upper ends of the power supply inlet alternating current circuit breakers is led into the power supply monitoring relay.
Preferably, the normally open auxiliary contacts of the first path power supply monitoring relay 3 and the second path power supply monitoring relay 4 are connected with the preferential power supply switching handle 5.
Further, a power supply switching handle is preferentially selected, and the internal contact state after conversion is utilized to be optimally arranged in the integral switching control loop, so that the purpose of selecting which path of alternating current input power supply is specifically required as the input main power supply is achieved.
Preferably, the preferential power supply switching handle 5 is connected to the first device power supply incoming terminal 24 and the second device power supply incoming terminal 25 through the first delay switching relay 12 and the second delay switching relay 13, respectively.
Preferably, the preferential power supply switching handle 5 is connected to the first power supply control relay 10 and the second power supply control relay 11 through the first power supply self-holding relay and the auxiliary contact 6 and the second power supply self-holding relay and the auxiliary contact 7, respectively, and the first power supply control relay 10 and the second power supply control relay 11 are connected to the first device power supply inlet wire terminal 24 and the second device power supply inlet wire terminal 25, respectively.
Further, the left side panel hole and the shutter of the right side panel are designed aiming at the problems of heating and dust accumulation in the equipment after long-term operation.
Further, the self-use self-relay and the auxiliary contact of the self-hold relay always keep continuous power supply function when the power supply is normal in loop design, and meanwhile, the normally closed auxiliary contact of the other group of power supply contactors is connected in series in the self-hold loop, so that the operation risk of simultaneously supplying power to two groups of power supplies is avoided.
Further, the two ac contactors are the final elements of control in the overall design, and when the contactors are energized, the corresponding internal contacts are turned on, and the power supply source supplies power to the important equipment through the circuit breaker and the contacts.
Preferably, the operation method of the double alternating current power supply switching device with power supply preference comprises the following steps:
s1, when a priority power supply selects a 1-path position of a switching handle 5, and after a first path of power supply monitoring relay 3 detects that the voltage at the outlet of a first path of power supply incoming line alternating current circuit breaker 1 is normal, a normally open auxiliary contact of the first path of power supply monitoring relay is matched with a contact when the priority power supply selects the 1-path position of the switching handle 5 and a single-phase miniature circuit breaker 14 contact, so that a single-phase positive excitation power supply is provided for a first path of power supply self-holding relay and the auxiliary contact 6, and the relay is excited;
s2, after the first power supply self-holding relay and the auxiliary contact 6 are excited, the normally open auxiliary contact is closed, and then the loop of the first power supply control relay 10 is conducted, the three-phase contact of the first contactor 17 is closed after the excitation of the relay, so that the first external power supply is used as the output power of the device, and as the normally open contact of the first power supply self-holding relay and the auxiliary contact 6 is always kept in a closed state after the excitation of the first power supply control relay 10, the contact of the first contactor 17 is kept in a connected state after the excitation of the relay is continuously excited, and finally the purpose of continuously outputting the first external power supply is achieved;
s3, the control logic of the second power supply loop and the control logic of the first power supply loop are the same;
s4, the first delay switching relay 12, the second delay switching relay 13 and auxiliary contacts are applied and coact with other components, so that after the power of a main power supply in two external power supplies is lost, the power can be automatically switched to a standby power supply through set delay, and the specific method is as follows:
the first path of external input power source is selected as a main power source under the normal condition, when the first path of external power source suddenly disappears, the self-holding relay of the first path of power source and the normally closed auxiliary contact of the auxiliary contact 6 are closed, and because the normally open contacts of the second path of power source monitoring relay 4 and the second single-phase miniature circuit breaker 15 are in a closed state at this moment, the positive power circuit of the second delay switching relay 13 is further connected, the internal timer is started after the second delay switching relay 13 is excited, after the set switching time is reached, the normally open auxiliary contact of the second delay switching relay 13 is closed, and at this moment, because the normally closed contact of the first path of power source control relay 10 is in a closed state, the exciting circuit of the second path of power source control relay 11 is further conducted, and the second contactor 18 is closed, so far, the function of switching the second group of power source through the delay of the second delay switching relay 13 after the first path of power source of the main power source disappears is completed.
The foregoing embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without collision. The protection scope of the present invention is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (9)
1. Double alternating current power supply automatic switching device with power supply preference is characterized in that: the automatic double-alternating-current power supply switching box comprises a double-alternating-current power supply switching box body (19), wherein the top of the double-alternating-current power supply switching box body (19) is connected with a power supply output terminal (26), and the bottom of the double-alternating-current power supply switching box body (19) is connected with a device N wire and an outgoing signal wiring terminal (23), a first device power supply incoming wire terminal (24) and a second device power supply incoming wire terminal (25); the surfaces of two sides of the double alternating current power supply switching box body (19) are respectively provided with a hole (20) and a shutter (21), and a device grounding terminal (22) is arranged below the hole (20); the inside electric connection of the double-alternating-current power supply automatic switching box body (19) is provided with a first path of power supply incoming line alternating-current circuit breaker (1) and a second path of power supply incoming line alternating-current circuit breaker (2).
2. The dual ac power source automatic switching device with power preference of claim 1, wherein: the input ends of the first power supply inlet wire alternating current circuit breaker (1) and the second power supply inlet wire alternating current circuit breaker (2) are electrically connected with a first device power supply inlet wire terminal (24) and a second device power supply inlet wire terminal (25) through leads; the output ends of the first power supply incoming line alternating current circuit breaker (1) and the second power supply incoming line alternating current circuit breaker (2) are respectively electrically connected with a first contactor (17) and a second contactor (18) through power supply connecting wires (16), and the first contactor (17) and the second contactor (18) are electrically connected with a device power supply output terminal (26).
3. The dual ac power source automatic switching device with power preference of claim 1, wherein: the first power supply inlet wire alternating current circuit breaker (1) and the second power supply inlet wire alternating current circuit breaker (2) are connected with the front panel of the device, and the control handle is positioned outside the panel, so that the circuit breaker is protected and meanwhile manual on-site operation is facilitated.
4. The dual ac power source automatic switching device with power preference of claim 1, wherein: a first path of power supply monitoring relay (3) and a second path of power supply monitoring relay (4) are arranged in the double-alternating-current power supply automatic switching box body (19); the monitoring input loop of the first path of power supply monitoring relay (3) is electrically connected between the input and the output of the first path of power supply through a first miniature circuit breaker (14), and the monitoring input loop of the second path of power supply monitoring relay (4) is electrically connected between the input and the output of the second path of power supply through a second miniature circuit breaker (15).
5. The dual ac power source automatic switching device with power preference of claim 4, wherein: the power supply inlet wire ends of the first path of power supply monitoring relay (3) and the second path of power supply monitoring relay (4) are respectively connected with the lower ends of the first path of power supply monitoring relay inlet wire micro switch (8) and the second path of power supply monitoring relay inlet wire micro switch (9), the upper ends of the first path of power supply monitoring relay inlet wire micro switch (8) and the upper ends of the second path of power supply monitoring relay inlet wire micro switch (9) are respectively connected with the upper ends of the first path of power supply inlet wire alternating current circuit breaker (1) and the second path of power supply inlet wire alternating current circuit breaker (2) in a three-phase mode, and then three-phase power at the upper ends of the power supply inlet wire alternating current circuit breaker is led into the power supply monitoring relay.
6. The dual ac power source automatic switching device with power preference of claim 1, wherein: the normally open auxiliary contacts of the first path of power supply monitoring relay (3) and the second path of power supply monitoring relay (4) are connected with a preferential power supply switching handle (5).
7. The dual ac power source automatic switching device with power preference of claim 6, wherein: the preferential power supply switching handle (5) is connected with a first device power supply incoming line terminal (24) and a second device power supply incoming line terminal (25) through a first delay switching relay (12) and a second delay switching relay (13) respectively.
8. The dual ac power source automatic switching device with power preference of claim 6, wherein: the power supply switching handle (5) is preferably connected with the first power supply control relay (10) and the second power supply control relay (11) through the first power supply self-retaining relay and the auxiliary contact (6) and the second power supply self-retaining relay and the auxiliary contact (7) respectively, and the first power supply control relay (10) and the second power supply control relay (11) are connected with the first device power supply inlet wire terminal (24) and the second device power supply inlet wire terminal (25) respectively.
9. The operation method of a dual ac power automatic switching device with power preference according to any one of claims 1 to 8, comprising the steps of:
s1, when a priority power supply selection switching handle (5) selects a 1-way position, and after a first power supply monitoring relay (3) detects that the voltage at the outlet of a first power supply incoming line alternating current circuit breaker (1) is normal, a normally open auxiliary contact of the first power supply monitoring relay is matched with a contact point when the priority power supply selection switching handle (5) selects the 1-way position and a contact point of a single-phase miniature circuit breaker (14), so that a single-phase positive excitation power supply is provided for a first power supply self-holding relay and the auxiliary contact point (6), and the relay is excited;
s2, after excitation of the first power supply self-holding relay and the auxiliary contact (6), the normally open auxiliary contact is closed, and then a loop of the first power supply control relay (10) is conducted, and after excitation of the relay, the three-phase contact of the first contactor (17) is closed, so that the first external power supply is used as an output power of the device, and as the normally open contact of the first power supply self-holding relay and the auxiliary contact (6) is always kept in a closed state after excitation, the contact of the first contactor (17) is kept in a switch-on state after excitation of the relay after continuous excitation of the first power supply control relay (10), and finally the purpose of continuous output of the first external power supply is achieved;
s3, the control logic of the second power supply loop and the control logic of the first power supply loop are the same;
s4, applying a first delay switching relay (12), a second delay switching relay (13) and auxiliary contacts to perform combined action with other components, and completing automatic switching to a standby power supply for power supply through set delay after power failure of a main power supply in two external power supplies, wherein the specific method is as follows:
the first path is selected as a main power supply under the normal condition of two paths of external input power supplies, when the first path of external power supply suddenly disappears, the self-holding relay of the first path of power supply and the normally closed auxiliary contact of the auxiliary contact (6) are closed, and because the normally open contact of the second path of power supply monitoring relay (4) and the second single-phase miniature circuit breaker (15) is in a closed state at this moment, the positive power supply loop of the second delay switching relay (13) is further connected, the internal timer is started after the second delay switching relay (13) is excited, the normally open auxiliary contact of the second delay switching relay (13) is closed after the set switching time is reached, and at this moment, the normally closed contact of the first path of power supply control relay (10) is in a closed state, and then the exciting loop of the second path of power supply control relay (11) is conducted, and the second contactor (18) is closed, so far, the function of switching on the second group of power supply through the second delay switching relay (13) after the first path of power supply of the main power supply disappears is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311273813.3A CN117439249A (en) | 2023-09-28 | 2023-09-28 | Dual alternating current power supply automatic switching device with power supply priority selection function and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311273813.3A CN117439249A (en) | 2023-09-28 | 2023-09-28 | Dual alternating current power supply automatic switching device with power supply priority selection function and operation method |
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| Publication Number | Publication Date |
|---|---|
| CN117439249A true CN117439249A (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311273813.3A Pending CN117439249A (en) | 2023-09-28 | 2023-09-28 | Dual alternating current power supply automatic switching device with power supply priority selection function and operation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117439249A (en) |
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2023
- 2023-09-28 CN CN202311273813.3A patent/CN117439249A/en active Pending
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