CN107069933B - Three-way power supply device - Google Patents
Three-way power supply device Download PDFInfo
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- CN107069933B CN107069933B CN201710180427.8A CN201710180427A CN107069933B CN 107069933 B CN107069933 B CN 107069933B CN 201710180427 A CN201710180427 A CN 201710180427A CN 107069933 B CN107069933 B CN 107069933B
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- power supply
- contactor
- electrically connected
- plc
- power
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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
- H02J9/061—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 DC powered loads
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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
Abstract
The invention discloses a three-way power supply device, which comprises: the power supply system comprises a first power supply, a second power supply, a third power supply, a PLC and a PLC power supply module, wherein each power supply is respectively and sequentially connected with a breaker and a main contactor in series and then is respectively and electrically connected to electric equipment, 2 incoming line side detection relays are arranged between three-phase live wires on the primary side of each main contactor, and coils of 2 incoming line side detection relays are electrically connected with any two-phase live wires which are not repeated; the direct current positive electrode output interface of the PLC is respectively connected with a voltage signal input interface at the wire inlet side and a direct current negative electrode output interface of the PLC through a normally open contact of a wire inlet side detection relay, and is grounded; the PLC power supply module supplies power for the PLC. The three-way power supply of the device is automatically switched, so that the power supply reliability and the safety of personnel and equipment are improved.
Description
Technical Field
The invention relates to the field of power distribution system automation, in particular to a three-way power supply device.
Background
With the development of industry, two power supplies are generally adopted for important equipment to supply power, and the two power supplies are used for one standby, so that automatic switching is realized. In order to further improve the reliability of powering the devices, more and more devices introduce a third power supply.
At present, a commonly used three-way power supply device comprises a first-way power supply, a second-way power supply, a third-way power supply, a power automatic switching device, a first circuit breaker MCCB1, a second circuit breaker MCCB2 and a third circuit breaker MCCB3, wherein the power supply principle is as shown in fig. 1, the first-way power supply is electrically connected with the primary side of the first circuit breaker MCCB1, the second-way power supply is electrically connected with the primary side of the second circuit breaker MCCB2, the third-way power supply is electrically connected with the primary side of the third circuit breaker MCCB3, the secondary side terminals of the first circuit breaker MCCB1, the second circuit breaker MCCB2 and the third circuit breaker MCCB3 are electrically connected with electric equipment after being electrically connected, and the power automatic switching device is respectively in control connection with the first circuit breaker MCCB1 and the second circuit breaker MCCB2 and is used for controlling the automatic switching of the first-way power supply and the second circuit breaker so as to realize the purpose of standby; however, when both the first power supply and the second power supply are powered off, the worker needs to supply power to the electric device from the third power supply by manually closing the third circuit breaker MCCB 3.
However, before the operator needs to manually start the third power supply to supply power to the electric equipment, it needs to ensure that the first circuit breaker MCCB1 and the second circuit breaker MCCB2 are in a switching-off state, otherwise, the situation of inverted power transmission occurs, that is, after the third circuit breaker MCCB3 is manually switched on, the secondary sides of the third circuit breaker MCCB3 are electrified, and because the secondary side terminals of the three circuit breakers are connected together, the secondary sides of the first circuit breaker MCCB1 and the second circuit breaker MCCB2 are also electrified, if the first circuit breaker MCCB1 or the second circuit breaker MCCB2 are in a switching-on state, the primary sides of the first circuit breaker MCCB1 or the second circuit breaker MCCB2 are electrified, so that the safety of the upper-stage power distribution equipment and maintenance personnel thereof is seriously affected.
Disclosure of Invention
The invention provides a three-way power supply device, which aims to solve the problem that when a worker starts a third-way power supply manually in the prior art, the first circuit breaker and the second circuit breaker are required to be in a switching-off state, otherwise, reverse power transmission can occur, and the safety of upper-level power distribution equipment and personnel is affected.
The invention provides a three-way power supply device, which comprises: the first power supply, the second power supply, the third power supply, the programmable logic controller PLC, the first contactor, the second contactor, the third contactor, the first circuit breaker, the second circuit breaker, the third circuit breaker and the PLC power supply module,
the first power supply is sequentially connected with the primary sides of the first circuit breaker and the first contactor main contact in series, the second power supply is sequentially connected with the primary sides of the second circuit breaker and the second contactor main contact in series, the third power supply is sequentially connected with the primary sides of the third circuit breaker and the third contactor main contact in series, secondary side terminals of the first contactor main contact, the second contactor main contact and the third contactor main contact are all electrically connected to electric equipment, 2 incoming line side detection relays are arranged between three-phase live wires of the primary sides of each contactor main contact, and the coils of the 2 incoming line side detection relays are electrically connected with any two-phase live wires which are not repeated;
The PLC comprises a power zero line input interface, a power live line input interface, a direct current positive electrode output interface, a direct current negative electrode output interface, three contactor control signal output interfaces and six incoming line side voltage signal input interfaces, wherein the direct current positive electrode output interfaces are respectively connected with one ends of normally open contacts of all incoming line side detection relays, the other ends of the normally open contacts of all incoming line side detection relays are respectively connected with one incoming line side voltage signal input interface, the direct current negative electrode output interface is grounded, the three contactor control signal output interfaces are respectively connected with one end of one contactor coil, and the other ends of the three contactor coils are electrically connected with the power zero line input interface;
and two output ends of the PLC power supply module are respectively and electrically connected with a power zero line input interface and a power live line input interface of the PLC.
Preferably, the PLC power supply module comprises a 220V ac power supply, the live wire of the 220V ac power supply is electrically connected with the live wire input interface of the power supply, and the zero line of the 220V ac power supply is electrically connected with the zero line input interface of the power supply.
Preferably, the PLC power module includes a first intermediate relay, a second intermediate relay, and an energization delay relay, wherein,
Any phase live wire at the primary side of the third contactor is electrically connected to the power live wire input interface through a normally open contact of a second intermediate relay;
any phase live wire at the primary side of the third contactor is electrically connected to a zero line of a three-way power supply sequentially through an electrifying delay relay delay closing contact and a second intermediate relay coil, and the zero line of the three-way power supply is electrically connected with a power supply zero line input interface; any phase live wire at the primary side of the third contactor is electrically connected to a zero line of the three-way power supply sequentially through a normally closed contact of a detection relay at one incoming line side of the second-way power supply, a normally closed contact of a detection relay at the incoming line side of the first-way power supply and an electrifying delay relay coil;
any phase live wire at the primary side of the second contactor is electrically connected to the power source live wire input interface through a normally closed contact of the first intermediate relay and a normally closed contact of the second intermediate relay in sequence;
any phase live wire at the primary side of the first contactor is electrically connected to a power source live wire input interface through a normally-open contact of the first intermediate relay and a normally-closed contact of the second intermediate relay in sequence; any phase live wire at the primary side of the first contactor is also electrically connected to a zero line of the three-way power supply through a first intermediate relay coil.
Preferably, the method comprises the steps of,
a load side detection relay is respectively connected between the phase A live wire and the phase B live wire and between the phase B live wire and the phase C live wire of the electric equipment; the PLC further comprises two load side voltage signal input interfaces, wherein the two load side voltage signal input interfaces are respectively electrically connected with one end of a normally open contact of a load side detection relay, and the other ends of the normally open contacts of the load side detection relay are electrically connected to a direct current positive electrode interface.
Preferably, the device further comprises six indicator lamps, the PLC further comprises six working state output interfaces, the six working state output interfaces are respectively connected with one end of one indicator lamp, and the other ends of all the indicator lamps are electrically connected with the power supply live wire input interface.
Preferably, the device further comprises four switches, the PLC further comprises four manual operation signal input interfaces, one ends of the four switches are electrically connected with the direct current positive electrode output interface, and the other ends of the four switches are electrically connected with the manual operation signal input interfaces respectively.
Preferably, the PLC comprises Siemens S7-200 CPU224 type PLC.
The technical scheme provided by the invention can comprise the following beneficial effects:
the three-way power supply device provided by the embodiment of the invention comprises: the three-phase power supply comprises a first path of power supply, a second path of power supply, a third path of power supply, a programmable logic controller PLC, a first contactor, a second contactor, a third contactor, a first circuit breaker, a second circuit breaker, a third circuit breaker and a PLC power supply module, wherein the first path of power supply is sequentially connected with the primary sides of a first circuit breaker and a first contactor main contact in series, the second path of power supply is sequentially connected with the primary sides of a second circuit breaker and a second contactor main contact in series, the third path of power supply is sequentially connected with the primary sides of a third circuit breaker and a third contactor main contact in series, secondary side terminals of the first contactor main contact, the second contactor main contact and the third contactor main contact are all electrically connected to electric equipment, 2 wire inlet side detection relays are arranged between three-phase live wires of the primary sides of each contactor main contact, and coils of the 2 wire inlet side detection relays are electrically connected with any two-phase live wires which are not repeated; the PLC comprises a power zero line input interface, a power live line input interface, a direct current positive electrode output interface, a direct current negative electrode output interface, three contactor control signal output interfaces and six incoming line side voltage signal input interfaces, wherein the direct current positive electrode output interfaces are respectively connected with one ends of all incoming line side detection relay normally open contacts, the other ends of all incoming line side detection relay normally open contacts are respectively connected with one incoming line side voltage signal input interface, the direct current negative electrode output interfaces are grounded, the three contactor control signal output interfaces are respectively connected with one end of one contactor coil, and the other ends of the three contactor coils are electrically connected with the power zero line input interfaces; and two output ends of the PLC power supply module are respectively and electrically connected with a power zero line input interface and a power live line input interface of the PLC. The device realizes that the three power supplies automatically switch the first power supply, the second power supply and the third power supply according to the preset logic sequence, and reduces the power failure time. Meanwhile, an interlocking protection function is provided for the three power supplies, when any one power supply supplies power, the other two power supplies cannot be connected, and misoperation can be well prevented. In addition, the device is composed of modularized independent elements, and each independent element can be independently replaced, so that the device is fast and convenient to maintain. The device can automatically switch three power supplies when power is supplied to electric equipment, has high automation degree, improves the working efficiency, reduces the running cost, and improves the power supply reliability of the electric equipment and the safety of personnel and equipment.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a three-way power supply device provided in the prior art;
fig. 2 is a schematic circuit diagram of a three-way power supply device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control principle of a three-way power supply device according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a PLC main wiring according to an embodiment of the present invention;
in fig. 1-4, the symbols represent: 1-a first power supply, 2-a second power supply, 3-a third power supply, 4-electric equipment, 5-PLC, 51-a power zero line input interface, 52-a power live line input interface, 53-a direct current positive electrode output interface, 54-a contactor control signal output interface, 55-a wire side voltage signal input interface, 56-a working state output interface, 57-a manual operation signal input interface, 58-a load side voltage signal input interface, 59-a direct current negative electrode output interface, a 6-PLC power supply module, D1-a first circuit breaker, D2-a second circuit breaker, D3-a third circuit breaker, J11-a first wire side detection relay coil, J12-a first wire side detection relay normally open contact, J13-a first wire side detection relay normally closed contact, J21-a second wire side detection relay coil, J22-second incoming line side detection relay normally open contact, J31-third incoming line side detection relay coil, J32-third incoming line side detection relay normally open contact, J33-third incoming line side detection relay normally closed contact, J41-fourth incoming line side detection relay coil, J42-fourth incoming line side detection relay normally open contact, J51-fifth incoming line side detection relay coil, J52-fifth incoming line side detection relay normally open contact, J61-sixth incoming line side detection relay coil, J62-sixth incoming line side detection relay normally open contact, J71-first load side detection relay coil, J72-first load side detection relay normally open contact, J81-second load side detection relay coil, j82-second load side detection relay normally open contact, K11-first contactor main contact, K12-first contactor coil, K21-second contactor main contact, K22-second contactor coil, K31-third contactor main contact, K32-third contactor coil, Z11-first intermediate relay normally open contact, Z12-first intermediate relay normally closed contact, Z13-first intermediate relay coil, Z21-second intermediate relay normally open contact, Z22-second intermediate relay normally closed contact, Z23-second intermediate relay coil, T11-power-on delay relay delay closed contact, T12-power-on delay relay coil.
Detailed Description
Referring to fig. 2 and 3, the three-way power supply device provided by the embodiment of the present invention includes: a first path of power supply 1, a second path of power supply 2, a third path of power supply 3, a PLC (Programmable Logic Controller ) 5, a first contactor, a second contactor, a third contactor, a first circuit breaker D1, a second circuit breaker D2, a third circuit breaker D3 and a PLC power supply module 6, wherein,
contactors are a common switching device that mainly include a coil, a main contact, and an auxiliary contact. The main contact is applied to the primary loop and is connected with electric equipment, and the electric equipment is controlled to be electrified or powered off; the auxiliary contact comprises a normally open contact and a normally closed contact, and is applied to the secondary circuit. The main contact and the auxiliary contact are controlled by a coil, the main contact is closed after the coil is electrified, the electric equipment is electrified, the auxiliary contact also acts, the normally closed contact of the auxiliary contact is opened, and the normally open contact of the auxiliary contact is closed; after the coil is powered off, the main contact is opened, the electric equipment is powered off, the auxiliary contact also acts, and the normally open contact and the normally closed contact of the auxiliary contact are opened and closed. In the embodiment of the present invention, for convenience of description, the first contactor is denoted by K1, and the first contactor K1 includes a first contactor main contact K11 and a first contactor coil K12; the second contactor is denoted by K2, the second contactor K2 comprises a second contactor main contact K21 and a second contactor coil K22, the third contactor is denoted by K3, and the third contactor K3 comprises a third contactor main contact K31 and a third contactor coil K32.
The first power supply 1 is sequentially connected with the primary sides of the first breaker D1 and the first contactor main contact K11 in series to form a first power supply circuit; the second power supply 2 is sequentially connected with the primary sides of the second breaker D2 and the second contactor main contact K21 in series to form a second power supply circuit; the third power supply 3 is sequentially connected with the third circuit breaker D3 and the primary side of the third contactor main contact K31 in series to form a third power supply circuit; the first power supply circuit, the second power supply circuit and the third power supply circuit are all electrically connected with the electric equipment 4.
The first, second and third circuit breakers D1, D2 and D3 mainly provide a short-circuit protection function for the secondary side circuits thereof, and can also be manual switching elements of three power supply circuits. In the specific implementation process, the first breaker D1, the second breaker D2 and the third breaker D3 comprise miniature circuit breakers or plastic shell circuit breakers, the main differences of the plastic shell circuit breakers and the miniature circuit breakers are different in rated current, and the rated current of the plastic shell circuit breakers is larger, and the largest is 630A generally, so that the plastic shell circuit breakers can be used in a power supply device of electric equipment with rated current between 100A and 630A; the rated current of the miniature circuit breaker is smaller and is generally within 100A, so that the miniature circuit breaker can be used in a power supply device of electric equipment with the rated current within 100A.
In a specific implementation process, the specific manner in which the first power supply circuit, the second power supply circuit and the third power supply circuit are electrically connected with the electric equipment 4 may be: the secondary side terminals of the first contactor main contact K11, the second contactor main contact K21 and the third contactor main contact K31 can be respectively electrically connected with the electric equipment 4, or the secondary side terminals of the first contactor main contact K11, the second contactor main contact K21 and the third contactor main contact K31 are connected in parallel first and then are electrically connected with the electric equipment 4.
In the embodiment of the invention, in order to reduce the number of power interfaces of the electric equipment 4, the three power supply circuits A, B and the C three-phase live wire are respectively connected in parallel and then are electrically connected with A, B of the electric equipment 4 and the C three-phase live wire power interfaces, the three power supplies can share a zero line, and the zero line of the three power supplies is electrically connected with the zero line power interface of the electric equipment 4. As shown in fig. 2, for convenience of description, A, B and C three-phase line conductors of the first power supply 1 are denoted by A1, B1, C1, A, B and C three-phase line conductors of the second power supply 2 are denoted by A2, B2, C2, and A, B and C three-phase line conductors of the third power supply 3 are denoted by A3, B3, C3. In the specific implementation process, the first contactor main contact K11, the second contactor main contact K21 and the third contactor main contact K31 are connected in parallel with A1, A2 and A3 of the secondary side of the three contactor main contacts and then are electrically connected with the A-phase power interface of the electric equipment 4, the B1, B2 and B3 of the secondary side of the three contactor main contacts are connected in parallel and then are electrically connected with the B-phase power interface of the electric equipment 4, and the C1, C2 and C3 of the secondary side of the three contactor main contacts are connected in parallel and then are electrically connected with the C-phase power interface of the electric equipment 4.
In order to detect whether any one of the three power supplies is powered off, 2 incoming line side detection relays are arranged between the three-phase live wires on the primary side of each main contact of each contactor, and the coils of the 2 incoming line side detection relays are electrically connected with any two-phase live wires which are not repeated. In the specific implementation process, the mode of arranging 2 incoming line side detection relays in each power supply comprises the following three modes: an incoming line side detection relay is arranged between the primary side A-phase live wire and the B-phase live wire of the first contactor main contact K11, the second contactor main contact K21 and the third contactor main contact K31, and an incoming line side detection relay is arranged between the B-phase live wire and the C-phase live wire; of course, a wire inlet side detection relay can be arranged between the primary side A-phase wire and the C-phase wire of the main contact of the three contactors, and a wire inlet side detection relay can be arranged between the C-phase wire and the B-phase wire; or, a wire inlet side detection relay is arranged between the primary side B-phase live wire and the primary side A-phase live wire of the three contactor main contacts, and a wire inlet side detection relay is arranged between the primary side A-phase live wire and the primary side C-phase live wire.
As shown in fig. 2, a first contactor main contact K11, a second contactor main contact K21, and a third contactor main contact K31 are respectively provided with a wire inlet side detection relay between a primary side a-phase wire and a B-phase wire, and between the B-phase wire and a C-phase wire.
The three-way power supply circuit is provided with 6 incoming line side detection relays in total, and in order to distinguish the 6 incoming line side detection relays, the 6 incoming line side detection relays are defined as respectively: the first incoming line side detection relay J1, the second incoming line side detection relay J2, the third incoming line side detection relay J3, the fourth incoming line side detection relay J4, the fifth incoming line side detection relay J5 and the sixth incoming line side detection relay J6.
The inlet wire side detection relay of setting at the primary side of first contactor main contact K11 is first inlet wire side detection relay J1 and second inlet wire side detection relay J2, and wherein, first inlet wire side detection relay J1 includes first inlet wire side detection relay coil J11, first inlet wire side detection relay normally open contact J12 and first inlet wire side detection relay normally closed contact J13, and second inlet wire side detection relay J2 includes: the second incoming line side detection relay coil J21 and the second incoming line side detection relay normally open contact J22. The two ends of the first incoming line side detection relay coil J11 are respectively electrically connected with the A-phase live wire and the B-phase live wire of the primary side of the first contactor main contact K11, and the two ends of the second incoming line side detection relay coil J21 are respectively electrically connected with the B-phase live wire and the C-phase live wire of the primary side of the first contactor main contact K11.
The inlet wire side detection relay that sets up in second contactor main contact K21 primary side is third inlet wire side detection relay J3 and fourth inlet wire side detection relay J4, wherein, third inlet wire side detection relay J3 includes third inlet wire side detection relay coil J31, third inlet wire side detection relay normally open contact J32 and third inlet wire side detection relay normally closed contact J33, fourth inlet wire side detection relay J4 includes fourth inlet wire side detection relay coil J41 and fourth inlet wire side detection relay normally open contact J42. The two ends of the third incoming line side detection relay coil J31 are respectively electrically connected with the A-phase live wire and the B-phase live wire of the primary side of the second contactor main contact K21, and the two ends of the fourth incoming line side detection relay coil J41 are respectively electrically connected with the B-phase live wire and the C-phase live wire of the primary side of the second contactor main contact K21.
The wire inlet side detection relay arranged on the primary side of the third contactor main contact K31 is a fifth wire inlet side detection relay J5 and a sixth wire inlet side detection relay J6, wherein the fifth wire inlet side detection relay J5 comprises a fifth wire inlet side detection relay coil J51 and a fifth wire inlet side detection relay normally open contact J52, and the sixth wire inlet side detection relay J6 comprises a sixth wire inlet side detection relay coil J61 and a sixth wire inlet side detection relay normally open contact J62. The two ends of the fifth incoming line side detection relay coil J51 are respectively electrically connected with the A-phase live wire and the B-phase live wire of the primary side of the third contactor main contact K31, and the two ends of the sixth incoming line side detection relay coil J61 are respectively electrically connected with the B-phase live wire and the C-phase live wire of the primary side of the third contactor main contact K31.
The purpose of setting 2 inlet wire side detection relays on the primary side of the main contact of the contactor of each power supply circuit is to detect whether the power supply in the power supply circuit is in power failure or not and send the detection result to the PLC5. The on/off of the main contacts of the three contactors are controlled by the PLC5, so that the on/off of the three-way power supply is controlled.
As shown in fig. 3, the PLC5 includes a power zero line input interface 51, a power live line input interface 52, a dc positive output interface 53, a dc negative output interface 59, three contactor control signal output interfaces 54, and six line side voltage signal input interfaces 55.
The PLC5 can convert input alternating current into low-voltage direct current to be output, the direct current positive electrode output interface 53 and the direct current negative electrode output interface 59 can output 24V direct current, wherein the direct current positive electrode output interface 53 is respectively connected with one ends of all normally open contacts of the incoming line side detection relay, the other ends of all normally open contacts of the incoming line side detection relay are respectively connected with an incoming line side voltage signal input interface 55, and the direct current negative electrode output interface 59 is grounded. In a specific implementation process, as shown in fig. 3, a direct current positive electrode output interface 53 is respectively connected to one ends of a first incoming line side detection relay normally open contact J12, a second incoming line side detection relay normally open contact J22, a third incoming line side detection relay normally open contact J32, a fourth incoming line side detection relay normally open contact J42, a fifth incoming line side detection relay normally open contact J52 and a sixth incoming line side detection relay normally open contact J62, and the other ends of the first incoming line side detection relay normally open contact J12, the second incoming line side detection relay normally open contact J22, the third incoming line side detection relay normally open contact J32, the fourth incoming line side detection relay normally open contact J42, the fifth incoming line side detection relay normally open contact J52 and the sixth incoming line side detection relay normally open contact J62 are respectively connected to an incoming line side voltage signal input interface 55, so that information about whether a detected three-way power supply circuit loses electricity is sent to the PLC5.
Three contactor control signal output interfaces 54 of the PLC5 are each connected to one end of one contactor coil, and the other ends of the three contactor coils are electrically connected to the power zero line input interface 51. In the specific implementation process, as shown in fig. 3, three contactor control signal output interfaces 54 are respectively connected to one ends of the first contactor coil K12, the second contactor coil K22, and the third contactor coil K32, and the other ends of the first contactor coil K12, the second contactor coil K22, and the third contactor coil K32 are electrically connected to the power zero line input interface 51. The PLC5 sends control signals to the three contactors according to the information of whether each power supply circuit loses power.
The PLC controls the on/off of the first, second and third power sources of the three contactors, so that it is grasped whether the contactors are failed to prevent malfunction. In the embodiment of the invention, a load side detection relay is respectively connected between the A-phase live wire and the B-phase live wire and between the B-phase live wire and the C-phase live wire of the electric equipment 4. The PLC5 further includes two load side voltage signal input interfaces 58, where the two load side voltage signal input interfaces 58 are each electrically connected to one end of a normally open contact of a load side detection relay, and the other ends of the two normally open contacts of the load side detection relay are electrically connected to the dc positive output interface 53.
In the specific implementation process, two load side detection relays are arranged on a three-phase fire wire between a parallel node of a three-way power supply circuit and electric equipment 4, the first load side detection relay J7 is arranged between an A-phase fire wire and a B-phase fire wire, and the second load side detection relay J8 is arranged between the B-phase fire wire and a C-phase fire wire. The first load side detection relay J7 comprises a first load side detection relay coil J71 and a first load side detection relay normally open contact J72; the second load side detection relay J8 includes a second load side detection relay coil J81 and a second load side detection relay normally open contact J82. One end of the first load side detection relay coil J71 is electrically connected with an A-phase live wire between the three-way power supply circuit parallel node and the electric equipment 4, and the other end of the first load side detection relay coil J71 is electrically connected with a B-phase live wire between the three-way power supply circuit parallel node and the electric equipment 4. One end of the second load side detection relay coil J81 is electrically connected with the B-phase live wire between the three-way power supply circuit parallel node and the electric equipment 4, and the other end of the second load side detection relay coil J81 is electrically connected with the C-phase live wire between the three-way power supply circuit parallel node and the electric equipment 4. One load side voltage signal input interface 58 of the PLC5 is electrically connected to one end of the first load side detection relay normally open contact J72, and the other load side voltage signal input interface 58 is electrically connected to one end of the second load side detection relay normally open contact J82. The other ends of the first load side detection relay normally open contact J72 and the second load side detection relay normally open contact J82 are electrically connected to the direct current positive electrode output interface 53.
In the specific implementation process, the coil voltages of all the load side detection relays and the incoming line side detection relays are 380V.
The function of the two load side detection relays is to detect whether the load side voltages of the three contactors are normal or not, and whether the three contactors have faults or not can be judged by comparing the working states of the line incoming side detection relays of the primary sides of the three contactors. When the wire inlet side detection relay is normally attracted and the load side detection relay is abnormally attracted, the contactor can be judged to be faulty. When the contactor fails, a fault prompt can be performed.
In order to further prompt the working state of the contactor, the device further comprises six indicator lamps, as shown in fig. 3, the PLC further comprises six working state output interfaces 56, the six working state output interfaces 56 are respectively connected with one end of an indicator lamp, and the other ends of all the indicator lamps are electrically connected with the power supply live wire input interface 52. The six indicator lamps H1-H6 in fig. 3, wherein H1 is a normal operation status indicator lamp of the first contactor K1, H2 is a fault indicator lamp of the first contactor, H3 is a normal operation status indicator lamp of the second contactor K2 operated by the second contactor, H4 is a fault indicator lamp of the second contactor, H5 is a normal operation status indicator lamp of the second contactor K3 operated by the third contactor, and H6 is a fault indicator lamp of the third contactor. In the specific implementation process, the H1 light can indicate that the first contactor K1 is put in, and the light is turned off to indicate that the first contactor K1 is not put in; the H2 lights up to indicate that the first contactor K1 fails, and the lights out to indicate that the first contactor K1 is normal; the H3 lights up to indicate that the second contactor K2 is put into operation, and lights out to indicate that the second contactor K2 is not put into operation; h4 on indicates a failure of the second contactor K2, off indicates normal; h5 is on to indicate that the third contactor K3 is put into operation, and is off to indicate that the third contactor K3 is not put into operation; h6 lights up to indicate a failure of the third contactor K3, and lights down to indicate a normal.
Through the arrangement of the load side detection relay and the six indicator lamps, the three-way power supply device has the function of automatically detecting the faults of the contactor, and when the contactor breaks down, lamplight signals can be given out, so that the fault finding and processing are convenient.
In the embodiment of the present invention, four switches are further provided, as shown in fig. 3, and the four switches are respectively a first switch S0, a second switch S1, a third switch S2, and a fourth switch S3, which are respectively used for manually operating the switching on and stopping the power supply to the electric equipment of the first power supply, the second power supply, and the third power supply. The PLC further includes four manual operation signal input interfaces 57, one ends of the first switch S0, the second switch S1, the third switch S2 and the fourth switch S3 are electrically connected to the dc positive output interface, and the other ends are electrically connected to the manual operation signal input interfaces 57.
Under the condition that the first power supply normally supplies power, pressing S0 firstly opens the contactor (except for the first contactor K1) which is supplying power, then closes the first contactor K1, the first power supply supplies power to the electric equipment, the application conditions of S1 and S2 are similar to S0, except that S1 corresponds to the second power supply, S2 corresponds to the third power supply, and no further description is given here. Pressing S3 will open the first contactor K1, the second contactor K2, and the third contactor K3, and the powered device is in a power-off state. By arranging four switches, the power supply of the electric equipment 4 can be conveniently selected and operated manually.
In the specific implementation process, the PLC comprises a Siemens S7-200 CPU224 type PLC, and the Siemens S7-200 CPU224 type PLC has 14-point input and 10-point output in terms of hardware configuration, so that the design requirement can be completely met. As shown in fig. 4, the N interface and the L interface of the siemens S7-200 cpu224 type PLC are respectively electrically connected to two output ends of the power supply module 6, and the N interface and the L interface are respectively a power zero line input interface 51 and a power live line input interface 52, and the ground interface is used for grounding. 1L, 2L and 3L are three control ends of 10 output interfaces, and 1L, 2L and 3L are respectively and electrically connected with the L interfaces. Three of the output ports 0.0, 0.1, 0.2 may be provided as three contactor control signal output ports 54,0.3, 0.4, 0.5, 0.6, 0.7, and 1.0 six may be provided as six operating state output ports 56. Of course, in the implementation process, the user may select any output interface other than 1L, 2L and 3L as the contactor control signal output interface and the working state output interface, which are not limited herein.
Under the condition of 220V voltage power supply, the Siemens S7-200 CPU224 type PLC can output 24V direct current, L + The interface can be used as a direct current positive electrode output interface, the M interface can be used as a direct current negative electrode output interface, 1M and 2M are two control ends of 14 input interfaces, and the 1M and 2M interfaces are respectively and electrically connected with the M interface. Four input interfaces 0.0, 0.1, 0.2 and 0.3 in the input end can be used as four manual operation signal input interfaces, six input interfaces 0.4, 0.5, 0.6, 0.7, 1.0 and 1.1 can be used as six incoming line side voltage signal input interfaces, and two input interfaces 1.2 and 1.3 can be used as two load side voltage signal input interfaces. Of course, in the implementation process, the user may select any other input interface except 1M and 2M as the manual operation signal input interface, the line-incoming side voltage signal input interface and the load side voltage signal input interface, which is not limited herein.
The power supply module 6 supplies power to the PLC5, and a power zero line input interface 51 and a power live line input interface 52 of the PLC5 are respectively and electrically connected with two output ends of the power supply module 6.
In a specific implementation process, the PLC power supply module 6 includes a 220V ac power supply, a live wire of the 220V ac power supply is electrically connected with the power live wire input interface 52, and a zero wire of the 220V ac power supply is electrically connected with the power zero wire input interface 51.
Of course, the PLC5 may also use the first power supply 1, the second power supply 2, and the third power supply 3 to supply power. In the embodiment of the invention, the PLC power supply module comprises a first intermediate relay Z1, a second intermediate relay Z2 and a power-on delay relay T1, wherein,
the first intermediate relay Z1 comprises a first intermediate relay normally open contact Z11, a first intermediate relay normally closed contact Z12 and a first intermediate relay coil Z13, the second intermediate relay Z2 comprises a second intermediate relay normally open contact Z21, a second intermediate relay normally closed contact Z22 and a second intermediate relay coil Z23, and the energizing delay relay T1 comprises an energizing delay relay delay closed contact T11 and an energizing delay relay coil T12.
Any phase live wire of the primary side of the third contactor is electrically connected to the power live wire input interface 52 through a normally open contact Z21 of the second intermediate relay, and in a specific implementation process, the A3 live wire of the primary side of the third contactor is electrically connected to the power live wire input interface 52 through the normally open contact Z21 of the second intermediate relay.
Any phase live wire at the primary side of the third contactor is also electrically connected to a zero line of a three-way power supply sequentially through the energizing delay relay delay closing contact T11 and the second intermediate relay coil Z23, and the zero line of the three-way power supply is electrically connected with a power supply zero line input interface 51; any phase live wire of the primary side of the third contactor is further electrically connected to a zero line of the three-way power supply through a normally closed contact J33 of the third incoming side detection relay, a normally closed contact J13 of the first incoming side detection relay and an electrifying delay relay coil T12 in sequence.
Any phase live wire on the primary side of the second contactor is electrically connected to the power live wire input interface 52 through a first intermediate relay normally-closed contact Z12 and a second intermediate relay normally-closed contact Z22 in sequence.
Any phase live wire on the primary side of the first contactor is electrically connected to the power live wire input interface 52 through a first intermediate relay normally-open contact Z11 and a second intermediate relay normally-closed contact Z22 in sequence.
Any phase live wire on the primary side of the first contactor is also electrically connected to the zero line of the three-way power supply through a first intermediate relay coil Z13.
The first intermediate relay coil Z13 is connected between an A-phase live wire and a zero line of the first power supply, when the first power supply is electrified, the first intermediate relay coil Z13 is electrified, the normally open contact Z11 of the first intermediate relay is closed, and the PLC is powered by the first power supply. When the first power supply is powered off, the first intermediate relay coil Z13 is powered off, the first intermediate relay normally-open contact Z11 is opened, the first intermediate relay normally-closed contact Z12 is closed, and the PLC is powered by the second power supply. When the first power supply is powered back, the first intermediate relay coil Z13 is powered, the normally open contact Z11 of the first intermediate relay is closed, and the PLC is powered by the first power supply. Only when the first power supply and the second power supply are all powered off, the normally closed contact J13 of the first incoming line side detection relay and the normally closed contact J33 of the third incoming line side detection relay are both closed, and the energizing delay relay coil T12 is turned on. When the delay time reaches the preset delay time of the energizing delay relay T1, the energizing delay relay delay closing contact T11 is closed, the second intermediate relay coil Z23 is electrified, the second intermediate relay normally-closed contact Z22 is opened, the second intermediate relay normally-open contact Z21 is closed, and the PLC is powered by a third power supply. When the first path of power supply or the second path of power supply resumes the power supply, the third inlet wire side detection relay normally closed contact J33 or the first inlet wire side detection relay normally closed contact J13 is disconnected, the power-on delay relay coil T12 is powered off, the power-on delay relay delay closed contact T11 is disconnected, the second intermediate relay coil Z23 is powered off, the second intermediate relay normally open contact Z21 is disconnected, the second intermediate relay normally closed contact Z22 is closed, and the PLC5 is powered by the first path of power supply 1 or the second path of power supply 2. The power-on delay relay has the function that after the first power supply 1 and the second power supply 2 are powered off, the third power supply 3 supplies power for the PLC5 after the power-on delay relay is powered on for a preset delay time, so that the PLC power supply is prevented from being frequently switched when the voltage of the first power supply 1 or the second power supply 2 fluctuates instantaneously. In addition, the PLC is internally inherited with a large capacitor to supply power, and the data of the PLC can be kept for at least 10s under the condition that the PLC loses power, so that the working state of the PLC is not influenced when the first power, the second power and the third power are switched, and the reliability and the stability of the three-way power supply device are ensured.
The three-way power supply device provided by the embodiment of the invention can preset the logic sequence of the three-way power supply in the PLC, so that the three-way power supply can automatically switch the first, second and third power supplies according to the preset logic sequence, and the power failure time is reduced. The device can work in an automatic mode according to a preset logic sequence, and can determine which power supply supplies power to electric equipment according to the running states of three power supplies. In the automatic mode, the logic sequence of the three-way power supply operation may be: the power supply device is powered by a first power supply 1, when the first power supply 1 is powered off, the power supply is powered by a second power supply 2, the first power supply 1 and the second power supply 2 are standby, the device can be automatically switched to a third power supply 3 only when the first power supply 1 and the second power supply 2 are powered off, the third power supply 3 is used for powering electric equipment, the device can be switched to the first power supply 1 or the second power supply 2 only when the third power supply 3 is powered off, and the device is preferentially switched to the first power supply 1 when the first power supply 1 and the second power supply 2 are powered on.
The three-way power supply device provided by the embodiment of the invention comprises: the three-phase power supply comprises a first path of power supply, a second path of power supply, a third path of power supply, a programmable logic controller PLC, a first contactor, a second contactor, a third contactor, a first circuit breaker, a second circuit breaker, a third circuit breaker and a PLC power supply module, wherein the first path of power supply is sequentially connected with the primary sides of a first circuit breaker and a first contactor main contact in series, the second path of power supply is sequentially connected with the primary sides of a second circuit breaker and a second contactor main contact in series, the third path of power supply is sequentially connected with the primary sides of a third circuit breaker and a third contactor main contact in series, secondary side terminals of the first contactor main contact, the second contactor main contact and the third contactor main contact are all electrically connected to electric equipment, 2 wire inlet side detection relays are arranged between three-phase live wires of the primary sides of each contactor main contact, and coils of the 2 wire inlet side detection relays are electrically connected with any two-phase live wires which are not repeated; the PLC comprises a power zero line input interface, a power live line input interface, a direct current positive electrode output interface, a direct current negative electrode output interface, three contactor control signal output interfaces and six incoming line side voltage signal input interfaces, wherein the direct current positive electrode output interfaces are respectively connected with one ends of all incoming line side detection relay normally open contacts, the other ends of all incoming line side detection relay normally open contacts are respectively connected with one incoming line side voltage signal input interface, the direct current negative electrode output interfaces are grounded, the three contactor control signal output interfaces are respectively connected with one end of one contactor coil, and the other ends of the three contactor coils are electrically connected with the power zero line input interfaces; and two output ends of the PLC power supply module are respectively and electrically connected with a power zero line input interface and a power live line input interface of the PLC. The device realizes that the three power supplies automatically switch the first power supply, the second power supply and the third power supply according to the preset logic sequence, and reduces the power failure time. Meanwhile, an interlocking protection function is provided for the three power supplies, when any one power supply supplies power, the other two power supplies cannot be connected, and misoperation can be well prevented. In addition, the device is composed of modularized independent elements, and each independent element can be independently replaced, so that the device is fast and convenient to maintain. The device can automatically switch three power supplies when power is supplied to electric equipment, has high automation degree, improves the working efficiency, reduces the running cost, and improves the power supply reliability of the electric equipment and the safety of personnel and equipment.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the invention herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
The embodiments of the present invention described above do not limit the scope of the present invention.
Claims (6)
1. A three-way power supply device, the device comprising: the first power supply (1), the second power supply (2), the third power supply (3), the programmable logic controller PLC (5), the first contactor, the second contactor, the third contactor, the first breaker (D1), the second breaker (D2), the third breaker (D3) and the PLC power supply module (6),
the first power supply (1) is sequentially connected with the primary sides of the first circuit breaker (D1) and the first contactor main contact (K11) in series, the second power supply (2) is sequentially connected with the primary sides of the second circuit breaker (D2) and the second contactor main contact (K21) in series, the third power supply (3) is sequentially connected with the primary sides of the third circuit breaker (D3) and the third contactor main contact (K31) in series, secondary side terminals of the first contactor main contact (K11), the second contactor main contact (K21) and the third contactor main contact (K31) are all electrically connected to the electric equipment (4), 2 incoming side detection relays are arranged between three-phase live wires of the primary sides of each contactor main contact, and coils of the 2 incoming side detection relays are electrically connected with any two-phase live wires which are not repeated;
A load side detection relay is respectively connected between the A-phase live wire and the B-phase live wire and between the B-phase live wire and the C-phase live wire of the electric equipment (4);
the PLC (5) comprises a power zero line input interface (51), a power live line input interface (52), a direct current positive electrode output interface (53), a direct current negative electrode output interface (59), three contactor control signal output interfaces (54) and six incoming line side voltage signal input interfaces (55), wherein the direct current positive electrode output interfaces (53) are respectively connected with one ends of all incoming line 15 side detection relay normally open contacts, the other ends of all incoming line side detection relay normally open contacts are respectively connected with one incoming line side voltage signal input interface (55), the direct current negative electrode output interface (59) is grounded, the three contactor control signal output interfaces (54) are respectively connected with one end of one contactor coil, and the other ends of the three contactor coils are electrically connected with the power zero line input interface (51);
two output ends of the PLC power supply module (6) are respectively and electrically connected with a power zero line input interface (51) and a power live line input interface (52) of the PLC (5);
The PLC power supply module (6) comprises a first intermediate relay, a second intermediate relay and an electrifying delay relay, wherein any phase live wire on the primary side of the third contactor is electrically connected to the power live wire input interface (52) through a normally open contact (Z21) of the second intermediate relay; any phase live wire at the primary side of the third contactor is further electrically connected to a zero line of a three-way power supply through an electrifying delay relay delay closed contact (T11) and a second intermediate relay coil (Z23) in sequence, and the zero line of the three-way power supply is electrically connected with the power supply zero line input interface (51); any phase live wire at the primary side of the third contactor is electrically connected to a zero line of the three-way power supply through one incoming line side detection relay normally-closed contact (J33), the incoming line side detection relay normally-closed contact (J13) and an electrifying delay relay coil (T12) of the first path power supply (1) in sequence;
any phase live wire at the primary side of the second contactor is electrically connected to the power live wire input interface (52) through a first intermediate relay normally-closed contact (Z12) and a second intermediate relay normally-closed contact (Z22) in sequence;
Any phase live wire at the primary side of the first contactor is electrically connected to a power live wire input interface (52) through a first intermediate relay normally-open contact (Z11) and a second intermediate relay normally-closed contact (Z22) in sequence; any phase live wire on the primary side of the first contactor is also electrically connected to a zero line of the three-way power supply through a first intermediate relay coil (Z13).
2. The apparatus of claim 1, wherein the PLC power module (6) comprises a 220V ac power source, a hot wire of the 220V ac power source being electrically connected to the power hot wire input interface (52), a neutral wire of the 220V ac power source being electrically connected to the power neutral wire input interface (51).
3. The apparatus of claim 1, wherein the PLC (5) further comprises two load side voltage signal input interfaces (58), each of the two load side voltage signal input interfaces (58) being electrically connected to one end of a normally open contact of a load side detection relay, and the other ends of the two normally open contacts of the load side detection relay being electrically connected to a dc positive output interface (53).
4. The device of claim 1, further comprising six indicator lights, wherein the PLC further comprises six operating status output interfaces (56), each of the six operating status output interfaces (56) being connected to one end of an indicator light, and the other ends of all the indicator lights being electrically connected to a power fire wire input interface (52).
5. The device according to claim 1, further comprising four switches, wherein the PLC further comprises four manual operation signal input interfaces (57), one end of each of the four switches being electrically connected to the dc positive output interface (53), and the other end of each of the four switches being electrically connected to a manual operation signal input interface (57).
6. The apparatus of claim 1, wherein the PLC comprises a siemens type S7-200CPU224 PLC.
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| CN108347092A (en) * | 2017-11-18 | 2018-07-31 | 深圳供电局有限公司 | A kind of method of substation's multiterminal in-put of spare power supply control |
| CN108429330A (en) * | 2018-03-23 | 2018-08-21 | 江苏吉野电气有限公司 | Three power supply automatic conversion control systems of elevator |
| CN108281966B (en) * | 2018-03-30 | 2023-12-29 | 国家电网公司 | Dual-power standby power supply operation control system for public building residential distribution room |
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