CN218678544U - Low-fault direct-current system power supply loop - Google Patents
Low-fault direct-current system power supply loop Download PDFInfo
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- CN218678544U CN218678544U CN202223259223.9U CN202223259223U CN218678544U CN 218678544 U CN218678544 U CN 218678544U CN 202223259223 U CN202223259223 U CN 202223259223U CN 218678544 U CN218678544 U CN 218678544U
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- power supply
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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
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Abstract
The utility model discloses a direct current system power supply loop of low trouble in the power supply field, including three-phase power supply pack, three-phase power supply pack links to each other with power bus row, is connected with a plurality of AC/DC converters on the power bus row, is connected with three-phase air switch between AC/DC converter and the power bus row, and the output of AC/DC converter links to each other with middle bus row, and middle bus row links to each other with power bus row, and power supply bus row is connected with stand-by power supply; by supplying power generating equipment of generating equipment for the auxiliary assembly is connected to power supply for it by power supply bus bar to when three phase power supply group breaks down unable normal power supply, can also directly continue to supply power for auxiliary assembly through the exhaust of power supply bus bar with stand-by power supply, when three phase power supply group breaks down simultaneously, the empty disconnection of opening of three-phase can provide timely protection of cutting off to the power supply side, avoids the trouble of power supply side to enlarge the power supply side, reduces the holistic fault rate of power supply loop.
Description
Technical Field
The utility model relates to a direct current system power supply loop of low trouble in the direct current power supply field.
Background
Power generation equipment in a power plant is fitted with a series of auxiliary equipment and to ensure that these auxiliary equipment can be used properly, a dc supply loop is typically used to provide dc power. In the prior art, the fault cannot be reliably removed when the fault occurs, the switching device only detects the voltage of the incoming line power supply and always uses the first path of power supply as a main power supply, and the fault of the charging side cannot cause the voltage of the incoming line power supply to be reduced, so that the incoming line power supply contactor is switched repeatedly, and finally the fault is enlarged.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a direct current system power supply loop of low trouble can cut off the trouble fast, realizes protecting the purpose of power supply side, avoids the trouble to enlarge.
In order to realize the above object, the utility model provides a direct current system power supply loop of low trouble, including three-phase power supply group, three-phase power supply group links to each other with power bus row, is connected with a plurality of AC/DC converters on the power bus row, is connected with the empty division of three-phase between AC/DC converter and the power bus row, and the output and the intermediate bus row of AC/DC converter link to each other, and the intermediate bus row links to each other with the power bus row, and the power bus row is connected with stand-by power supply.
Compared with the prior art, the beneficial effects of the utility model reside in that, three-phase power supply group is with 380V alternating current loading on power bus row, and the AC/DC converter then turns into the direct current with the 380V alternating current, and arrange the direct current loading on middle bus, arrange through middle bus and carry the direct current to power supply bus row on, by power supply bus row with power plant power generation equipment be connected for auxiliary assembly, for its power supply, and when three-phase power supply group breaks down unable normal power supply, can also directly continue to supply power for auxiliary assembly through power supply bus exhaust with stand-by power supply, when three-phase power supply group breaks down simultaneously, the empty disconnection that opens of three-phase, can provide timely cut-off protection to the power supply side, avoid the trouble of power supply side to enlarge the power supply side, reduce the holistic fault rate of power supply loop.
As a further improvement of the utility model, three-phase power supply group includes switch 1QF1 and switch 1QF2, switch 1QF1 and switch 1QF 2's input all links to each other with the 380V power, switch 1QF 1's output links to each other with contactor 1KM 1's input, switch 1QF 2's output links to each other with contactor 1KM 2's input, contactor 1KM1 and contactor 1KM 2's output all links to each other with power bus row, link to each other through hand automatic transfer switch between contactor 1KM1 and the contactor 1KM 2.
The circuit of arranging the power supply for power bus has two ways like this, every all has switch and contactor to constitute all the way, normal during operation, connect through manual automatic change over switch between the contactor of two ways circuits, under the normal condition, normally be power bus row power supply all the way, another way then the contactor disconnection, and when this of power supply broke down all the way, then manual automatic change over switch can be with this contactor disconnection all the way of power supply, and the contactor on another way is closed, make power bus arrange can continue to supply power for the AC/DC converter.
As a further improvement, the standby power supply comprises a storage battery pack which is connected with a power supply bus bar.
The bus bar of supplying power is with direct current loading to in the middle of like this, for auxiliary assembly lasts the power supply on the one hand, can last charging for the battery on the one hand, in case the condition of outage appears in the middle bus, then the battery can be backward for supplying power to the bus bar row power supply to ensure that auxiliary assembly does not cut off the power supply.
As a further improvement, the utility model is provided with switch QF11 between the middle bus bar and the power supply bus bar, and is provided with switch QF12 between storage battery and the power supply bus bar.
Therefore, once the storage battery pack has a fault, the switch QF12 can be immediately cut off, and the fault of the storage battery is prevented from influencing the normal power supply between the power supply bus bar and the three-phase power supply pack; and when a fault occurs between the middle bus bar and the three-phase power supply group and the switch QF11 is switched off, the fault can be prevented from spreading to the normal power supply of the power supply bus bar and the storage battery pack, and the fault rate of the whole loop can be effectively reduced.
As a further improvement of the utility model, the three-phase air-open auxiliary contact is connected with the DCS control cabinet; add auxiliary node on the empty division of three-phase like this, with divide closing fault signal independent setting to install the alarm lamp on the DCS control cabinet, can more audio-visual reaction fault point when breaking down, connect auxiliary relay in this return circuit simultaneously, react fault signal to DCS through 24V.
As a further improvement of the utility model, be provided with switch FKD11 between storage battery and switch QF12, switch FKD11 with connect discharge device and link to each other.
Therefore, when the storage battery is periodically detected, the switch QF12 can be switched off, and the switch FKD11 is switched on and switched off, so that the storage battery pack is communicated with the discharging device, and the discharging detection with the storage battery is facilitated.
As a further improvement of the utility model, an anti-reverse diode is arranged on the positive output end of the AC/DC converter.
Therefore, voltage difference of output ends of each AC/DC converter can be effectively prevented, and high voltage flows backwards towards the AC/DC converter with lower output voltage; or when the AC/DC converter cannot output current due to faults, the current reversely output by the storage battery cannot flow backwards to the AC/DC converter, so that safety is ensured.
As a further improvement of the utility model, the storage battery is connected with the battery polling instrument, and the wiring end of the storage battery is provided with a fuse; therefore, the service condition of the battery can be detected in real time, and when faults such as overvoltage or overcurrent occur, the fuse is disconnected, so that the safety of the storage battery is ensured.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the low-fault DC system power supply circuit includes a three-phase power supply set, the three-phase power supply set is connected to a power bus bar, the power bus bar is connected with a plurality of AC/DC converters, a three-phase air switch is connected between the AC/DC converters and the power bus bar, an output end of the AC/DC converters is connected to an intermediate bus bar, the intermediate bus bar is connected to a power supply bus bar, and the power supply bus bar is connected to a standby power supply.
The three-phase power supply group comprises a switch 1QF1 and a switch 1QF2, the input ends of the switch 1QF1 and the switch 1QF2 are connected with a 380V power supply, the output end of the switch 1QF1 is connected with the input end of a contactor 1KM1, the output end of the switch 1QF2 is connected with the input end of a contactor 1KM2, the output ends of the contactor 1KM1 and the contactor 1KM2 are connected with a power bus bar, and the contactor 1KM1 and the contactor 1KM2 are connected through a manual automatic change-over switch.
The standby power supply comprises a storage battery pack, and the storage battery pack is connected with the power supply bus bar; a switch QF11 is arranged between the middle bus bar and the power supply bus bar, and a switch QF12 is arranged between the storage battery pack and the power supply bus bar; the three-phase air-switch auxiliary contact is connected with the DCS control cabinet; a switch FKD11 is arranged between the storage battery pack and the switch QF12, and the switch FKD11 is connected with a discharge device; an anti-reverse diode is arranged on the positive output end of the AC/DC converter; the storage battery pack is connected with the battery patrol instrument, and a fuse is arranged at a wiring terminal of the storage battery pack.
The utility model discloses in, switch 1QF1 and contactor 1KM1 concatenate and form the power supply branch road of the first kind, switch 1QF2 and contactor 1KM2 concatenate and form the power supply branch road of the second kind, first power supply branch road and second power supply branch road all are connected with 380V's power, in normal work, switch 1QF1 and contactor 1KM1 are closed, contactor 1KM2 is the disconnection, supply power for power bus row by the power supply branch road of the first kind, and in case the branch road of the first kind breaks down, then break off contactor 1KM1 through hand automatic switch, contactor 1KM2 is closed, make the power supply branch road of the second kind switch on for its power supply with power bus row.
Because a plurality of AC/DC converters are connected in parallel on the power supply bus bar, alternating current is converted into direct current through the AC/DC converters and is loaded on the middle bus bar, and because the switch QF11 and the switch QF12 are both in a closed state during normal work, the direct current on the middle bus bar is loaded on the power supply bus bar, on one hand, the power supply bus bar is connected with auxiliary equipment of power generation equipment to supply power for the auxiliary equipment, and on the other hand, the storage battery pack can be continuously charged.
Once the middle bus bar cannot normally supply power to the power supply bus bar due to various reasons, the storage battery loads the reverse output direct current on the power supply bus bar, the storage battery continues to supply power to the auxiliary equipment, and the reverse diode can prevent the current of the storage battery from flowing back to the AC/DC converter, so that an operator can disconnect the switch QF11 in sufficient time, and the fault expansion is avoided.
And in case the battery breaks down, then can close switch QF12, cut off the connection between battery and the power supply generating line row to if when faults such as overcurrent overvoltage appear, the fuse also can in time fuse, thereby the quick disconnection battery is connected with the power supply generating line row, avoids the expansion of trouble.
Through setting up the empty switch of three-phase between power supply bus bar and AC/DC converter, when breaking down between power supply bus bar and the three-phase power supply group, in time cut off the AC/DC converter through the empty switch of three-phase and arrange with power supply bus bar between be connected to ensure that the trouble of whole return circuit can not enlarge, reduce the loss, can also continue to supply power for auxiliary assembly through storage battery simultaneously.
The utility model discloses, reduce personnel's repetitive work, improve maintenance process security and whole power supply circuit's operational reliability, save cost of maintenance, can also effectively restrain the fault amplification.
The present invention is not limited to the above embodiments, and based on the technical solutions of the present disclosure, those skilled in the art can make some substitutions and modifications to some technical features without creative labor, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (8)
1. A direct current system power supply circuit of low fault which characterized in that: the three-phase power supply system comprises a three-phase power supply set, wherein the three-phase power supply set is connected with a power bus bar, a plurality of AC/DC converters are connected to the power bus bar, a three-phase air switch is connected between the AC/DC converters and the power bus bar, the output end of each AC/DC converter is connected with an intermediate bus bar, the intermediate bus bar is connected with a power supply bus bar, and the power supply bus bar is connected with a standby power supply.
2. A low fault dc system supply circuit according to claim 1, characterized in that: the three-phase power supply group comprises a switch 1QF1 and a switch 1QF2, the input ends of the switch 1QF1 and the switch 1QF2 are connected with a 380V power supply, the output end of the switch 1QF1 is connected with the input end of a contactor 1KM1, the output end of the switch 1QF2 is connected with the input end of a contactor 1KM2, the output ends of the contactor 1KM1 and the contactor 1KM2 are connected with a power bus bar, and the contactor 1KM1 and the contactor 1KM2 are connected through a manual automatic change-over switch.
3. A low fault dc system supply circuit according to claim 2, characterized in that: the standby power supply comprises a storage battery pack, and the storage battery pack is connected with the power supply bus bar.
4. A low-fault dc system supply circuit according to claim 3, characterized in that: a switch QF11 is arranged between the middle bus bar and the power supply bus bar, and a switch QF12 is arranged between the storage battery pack and the power supply bus bar.
5. A low fault DC system supply circuit according to claim 4, characterized in that: and the three-phase air-open auxiliary contact is connected with the DCS control cabinet.
6. A low fault DC system supply circuit according to claim 5, characterized in that: a switch FKD11 is arranged between the storage battery pack and the switch QF12, and the switch FKD11 is connected with a discharge device.
7. A low fault dc system supply circuit according to claim 6, characterized in that: and an anti-reverse diode is arranged on the positive output end of the AC/DC converter.
8. A low fault dc system supply circuit according to claim 7, characterized in that: the storage battery pack is connected with the battery patrol instrument, and a fuse is arranged at a wiring terminal of the storage battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223259223.9U CN218678544U (en) | 2022-12-06 | 2022-12-06 | Low-fault direct-current system power supply loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223259223.9U CN218678544U (en) | 2022-12-06 | 2022-12-06 | Low-fault direct-current system power supply loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218678544U true CN218678544U (en) | 2023-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223259223.9U Active CN218678544U (en) | 2022-12-06 | 2022-12-06 | Low-fault direct-current system power supply loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218678544U (en) |
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2022
- 2022-12-06 CN CN202223259223.9U patent/CN218678544U/en active Active
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