CN219247479U - DC control power supply loop of medium-voltage distribution system and medium-voltage distribution system - Google Patents
DC control power supply loop of medium-voltage distribution system and medium-voltage distribution system Download PDFInfo
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- CN219247479U CN219247479U CN202320263926.4U CN202320263926U CN219247479U CN 219247479 U CN219247479 U CN 219247479U CN 202320263926 U CN202320263926 U CN 202320263926U CN 219247479 U CN219247479 U CN 219247479U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The utility model relates to a direct current control power supply loop of a medium voltage distribution system and the medium voltage distribution system, comprising: the device comprises a first power supply device, a second power supply device, a medium-voltage direct-current bus and a ring network loop; the first power supply device is connected with the medium-voltage direct-current bus and used for providing a first power supply voltage for the medium-voltage direct-current bus; the second power supply device is connected with the medium-voltage direct-current bus and is used for providing a second power supply voltage for the medium-voltage direct-current bus; the ring network loop is connected with the medium-voltage direct-current bus and is connected with the medium-voltage direct-current bus in parallel, so that power is supplied through the ring network loop when the medium-voltage direct-current bus is powered off. The ring network loop is arranged to connect the head and the tail of the power supply device to form the ring network, so that when the direct current bus is powered off, continuous power supply is ensured through the ring network loop, the phenomenon of losing the direct current power supply is avoided, and the problem caused by distortion of the direct current power supply can be avoided.
Description
Technical Field
The utility model relates to the technical field of medium voltage distribution systems, in particular to a direct current control power supply loop of a medium voltage distribution system and the medium voltage distribution system.
Background
The nuclear power medium voltage distribution system is powered off by a medium voltage direct current bus, so that a direct current power supply is lost at a later interval. And loss of dc power has the following effects:
1) Losing the direct current power supply to cause the circuit trip of the electric self-holding contactor, and the 6.6kV executing device is inoperable;
2) Loss of the direct current power supply will cause the downstream motor and transformer of the medium voltage distribution system to lose control of the master control room and the on-site test box, and the circuit breaker loop can only be mechanically closed/tripped on site;
3) Loss of the direct current power supply causes power failure of a circuit breaker related to slow switching, so that station service switching cannot be performed;
4) The medium voltage distribution system loses the working power supply of the protection device, so that the medium voltage disc is not protected;
5) The part of the alarm and the monitoring information of the main control room of the medium-voltage distribution system are affected.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a direct current control power supply loop of a medium voltage distribution system and the medium voltage distribution system aiming at the defects of the prior art.
The technical scheme adopted for solving the technical problems is as follows: a dc control power circuit for a medium voltage power distribution system is constructed, comprising: the device comprises a first power supply device, a second power supply device, a medium-voltage direct-current bus and a ring network loop;
the first power supply device is connected with the medium-voltage direct-current bus and used for providing a first power supply voltage for the medium-voltage direct-current bus;
the second power supply device is connected with the medium-voltage direct-current bus and is used for providing a second power supply voltage for the medium-voltage direct-current bus;
the ring network loop is connected with the medium-voltage direct-current bus and is connected with the medium-voltage direct-current bus in parallel, so that power is supplied through the ring network loop when the medium-voltage direct-current bus is powered off.
In the dc control power supply circuit of the medium voltage distribution system of the present utility model, the medium voltage dc bus includes: a first direct current bus and a second direct current bus;
the looped network loop includes: a first sub-ring network and a second sub-ring network;
the first sub-ring network is connected with the first direct current bus in parallel, and power is supplied through the first sub-ring network when the first direct current bus is powered off;
the second sub-ring network is connected with the second direct current bus in parallel, and when the second direct current bus is powered off, power is supplied through the second sub-ring network.
In the dc control power supply circuit of the medium voltage distribution system of the present utility model, the first dc bus includes: a head end connection end and a tail end connection end;
the first sub-ring network includes: a first connection line and a second connection line;
the first end of the first connecting wire of the first sub-ring network is connected with the positive terminal of the head end connecting end of the first direct current bus, and the second end of the first connecting wire of the first sub-ring network is connected with the positive terminal of the tail end connecting end of the first direct current bus;
the first end of the second connecting wire of the first sub-ring network is connected with the negative terminal of the head end connecting end of the first direct current bus, and the second end of the second connecting wire of the first sub-ring network is connected with the negative terminal of the tail end connecting end of the first direct current bus.
In the dc control power supply circuit of the medium voltage distribution system of the present utility model, the second dc bus includes: a head end connection end and a tail end connection end;
the second sub-ring network includes: a first connection line and a second connection line;
the first end of the first connecting wire of the second sub-ring network is connected with the positive terminal of the head end connecting end of the second direct current bus, and the second end of the first connecting wire of the second sub-ring network is connected with the positive terminal of the tail end connecting end of the second direct current bus;
the first end of the second connecting wire of the second sub-ring network is connected with the negative terminal of the head end connecting end of the second direct current bus, and the second end of the second connecting wire of the second sub-ring network is connected with the negative terminal of the tail end connecting end of the second direct current bus.
In the dc control power supply circuit of the medium voltage distribution system of the present utility model, the dc control power supply circuit further includes: the first alarm indication switch and the first electric equipment;
the first alarm indication switch is connected with the first direct current bus and is used for executing a turn-off action when the power supply of the first direct current bus is abnormal;
the first electric equipment is connected with the first direct current bus and is used for receiving the electric signals provided by the first direct current bus and outputting corresponding electric energy to downstream equipment.
In the dc control power supply circuit of the medium voltage distribution system of the present utility model, the dc control power supply circuit further includes: the second alarm indication switch and the second electric equipment;
the second alarm indication switch is connected with the second direct current bus and is used for executing a turn-off action when the power supply of the second direct current bus is abnormal;
the second electric equipment is connected with the second direct current bus and is used for receiving the electric signal provided by the first direct current bus and outputting corresponding electric energy to downstream equipment.
In the dc control power supply circuit of the medium voltage distribution system of the present utility model, the dc control power supply circuit further includes: a power-off detection circuit;
the power-off detection circuit is connected with the medium-voltage direct-current bus and is used for conducting power-on detection on the medium-voltage direct-current bus and outputting a power-off detection signal when the medium-voltage direct-current bus is powered off.
In the dc control power supply circuit of the medium voltage distribution system of the present utility model, the dc control power supply circuit further includes: an alarm circuit;
the alarm circuit is connected with the power-off detection circuit and is used for outputting an alarm signal according to the power-off detection signal.
In the dc control power supply circuit of the medium voltage distribution system of the present utility model, the first power supply device includes: a first DC power supply; the second power supply device includes: a second DC power supply;
the first direct current power supply is connected with the medium voltage direct current bus and used for providing first direct current for the medium voltage direct current bus;
the second direct current power supply is connected with the medium voltage direct current bus and used for providing second direct current for the medium voltage direct current bus.
The utility model also provides a medium voltage power distribution system, comprising: the medium voltage distribution system dc control power supply loop described above.
The DC control power supply loop of the medium-voltage distribution system and the medium-voltage distribution system have the following beneficial effects: comprising the following steps: the device comprises a first power supply device, a second power supply device, a medium-voltage direct-current bus and a ring network loop; the first power supply device is connected with the medium-voltage direct-current bus and used for providing a first power supply voltage for the medium-voltage direct-current bus; the second power supply device is connected with the medium-voltage direct-current bus and is used for providing a second power supply voltage for the medium-voltage direct-current bus; the ring network loop is connected with the medium-voltage direct-current bus and is connected with the medium-voltage direct-current bus in parallel, so that power is supplied through the ring network loop when the medium-voltage direct-current bus is powered off. The ring network loop is arranged to connect the head and the tail of the power supply device to form the ring network, so that when the direct current bus is powered off, continuous power supply is ensured through the ring network loop, the phenomenon of losing the direct current power supply is avoided, and the problem caused by distortion of the direct current power supply can be avoided.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a dc control power supply loop of a medium voltage distribution system according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a dc control power supply loop of a medium voltage distribution system according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the present utility model provides a dc control power supply loop of a medium voltage power distribution system, which can effectively solve the problem that a dc power supply is lost at intervals due to the power failure of a medium voltage dc bus 30, and can also avoid the influence caused by the loss of the dc power supply. The circuit of the electric self-holding contactor is not tripped due to the loss of the direct current power supply, and the 6.6kV executing device is not operable; the control of a main control room and an on-site test box is not lost by a motor and a transformer at the downstream of the medium-voltage distribution system, so that a circuit breaker loop can only be mechanically switched on/tripped on site; the breaker related to slow switching cannot be powered off and cannot be switched on for service; the middle pressure plate is not protected due to the fact that the working power supply of the protection device is lost in the middle voltage distribution system; the part of the medium-voltage distribution system alarm and the monitoring information of the main control room are not affected. The direct-current control power supply loop of the medium-voltage power distribution system can be applied to the medium-voltage power distribution system for nuclear power.
Specifically, as shown in fig. 1, the dc control power supply circuit of the medium voltage distribution system includes: the power supply system comprises a first power supply device 10, a second power supply device 20, a medium-voltage direct-current bus 30 and a looped network loop 40.
The first power supply device 10 is connected to the medium voltage dc bus 30 for providing a first power supply voltage to the medium voltage dc bus 30; the second power supply device 20 is connected to the medium voltage dc bus 30 for providing a second power supply voltage to the medium voltage dc bus 30; the ring network loop 40 is connected with the medium voltage direct current bus 30, and the ring network loop 40 is arranged in parallel with the medium voltage direct current bus 30 so as to supply power through the ring network loop 40 when the medium voltage direct current bus 30 is powered off.
Specifically, by setting the ring network loop 40, the end-to-end connection of the terminal rows of the medium-voltage direct-current bus 30 can form a ring network, when any break point occurs in the direct-current bus, the power can be directly and continuously supplied through the ring network loop 40, and further, the first power supply device 10 and/or the second power supply device 20 can be ensured to continuously supply power through the ring network loop 40, and meanwhile, the power supply reliability of the first power supply device 10 and the second power supply device 20 can be further provided.
Further, as shown in fig. 1, the medium voltage dc bus 30 includes: a first dc bus 31 and a second dc bus 32. Wherein the first dc bus 31 and the second dc bus 32 are independent from each other.
The ring network circuit 40 includes: a first sub-ring network 41 and a second sub-ring network 42.
The first sub-ring network 41 is connected with the first direct current bus 31 in parallel, and power is supplied through the first sub-ring network 41 when the first direct current bus 31 is powered off; the second sub-ring network 42 is connected in parallel with the second direct current bus 32, and when the second direct current bus 32 is powered off, power is supplied through the second sub-ring network 42.
Specifically, when any breakpoint occurs in the first dc bus 31, continuous power supply can be ensured directly through the first sub-ring network 41, and abnormal power supply is not caused; when any breakpoint occurs to the second direct current bus 32, continuous power supply can be ensured directly through the second sub-ring network 42, and abnormal power supply cannot be caused; therefore, when any breakpoint occurs to the direct-current bus, the power supply can be continuously ensured through the ring network loop 40, and the direct-current power supply loss of the medium-voltage distribution system is avoided.
Further, in some embodiments, as shown in fig. 1, the dc control power supply circuit of the medium voltage distribution system further includes: a first alarm indication switch 51 and a first powered device 61.
The first alarm indication switch 51 is connected to the first dc bus 31, and is configured to perform a turn-off operation when the first dc bus 31 is abnormal in power supply. Specifically, as shown in fig. 1, one end of the first alarm indication switch 51 is connected to the positive input end of the head end connection end of the first dc bus 31, and the other end of the first alarm indication switch 51 is connected to the negative input end of the head end connection end of the first dc bus 31. Wherein the first alarm indication switch 51 may be a relay switch.
The first electric device 61 is connected to the first dc bus 31, and is configured to receive an electrical signal provided by the first dc bus 31 and output corresponding electrical energy to a downstream device. Specifically, as shown in fig. 1, the positive input end of the first electric device 61 is connected to the positive end of the tail end connection end of the first dc bus 31, and the negative input end of the first electric device is connected to the negative end of the tail end connection end of the first dc bus 31. In the present utility model, the first electric device 61 includes a plurality of electric power utilization chambers, where the devices in each electric power utilization chamber are the same or different, and are specifically determined according to practical applications.
Further, in some embodiments, as shown in fig. 1, the dc control power supply circuit of the medium voltage distribution system further includes: a second alarm indication switch 52 and a second powered device 62.
The second alarm indication switch 52 is connected to the second dc bus 32, and is used for executing a turn-off action when the power supply of the second dc bus 32 is abnormal. Specifically, as shown in fig. 1, one end of the second alarm indication switch 52 is connected to the positive input end of the head end connection end of the second dc bus 32, and the other end of the second alarm indication switch 52 is connected to the negative input end of the head end connection end of the second dc bus 32. Wherein the second alarm indication switch 52 may be a relay switch.
The second electric device 62 is connected to the second dc bus 32, and is configured to receive the electric signal provided by the second dc bus 32 and output corresponding electric energy to a downstream device. Specifically, as shown in fig. 1, the positive input end of the second electric device 62 is connected to the positive end of the tail end connection end of the second dc bus 32, and the negative input end of the second electric device is connected to the negative end of the tail end connection end of the second dc bus 32. In the present utility model, the second electric device 62 includes a plurality of electric power utilization chambers, where the devices in each electric power utilization chamber are the same or different, and are specifically determined according to practical applications.
Optionally, in an embodiment of the present utility model, the first power supply device 10 includes: a first DC power supply; the second power supply device 20 includes: and a second DC power supply.
The first direct current power supply is connected with the medium voltage direct current bus 30 and is used for providing first direct current for the medium voltage direct current bus 30; the second dc power source is connected to the medium voltage dc bus 30 for providing a second dc power to the medium voltage dc bus 30.
Specifically, when only the first direct current power supply is needed, the first direct current power supply supplies power, and at this time, the direct current provided by the first direct current power supply is transmitted on the medium voltage direct current bus 30; when only the second dc power supply is needed, the second dc power supply supplies power, and the dc power supplied by the second dc power supply is transmitted on the medium voltage dc bus 30.
In one particular embodiment, as shown in fig. 2, the first dc bus 31 includes: a head end connection end and a tail end connection end; the first sub-ring network 41 includes: a first connection line and a second connection line.
Wherein, the first end of the first connection wire of the first sub ring network 41 is connected with the positive terminal of the head end connection end of the first dc bus 31, and the second end of the first connection wire of the first sub ring network 41 is connected with the positive terminal of the tail end connection end of the first dc bus 31; the first end of the second connection line of the first sub ring network 41 is connected with the negative terminal of the head end connection end of the first direct current bus 31, and the second end of the second connection line of the first sub ring network 41 is connected with the negative terminal of the tail end connection end of the first direct current bus 31.
The second dc bus 32 includes: a head end connection end and a tail end connection end; the second sub-ring network 42 includes: a first connection line and a second connection line.
The first end of the first connection line of the second sub-ring network 42 is connected with the positive terminal of the head end connection end of the second dc bus 32, and the second end of the first connection line of the second sub-ring network 42 is connected with the positive terminal of the tail end connection end of the second dc bus 32; the first end of the second connection wire of the second sub-ring network 42 is connected with the negative terminal of the head end connection end of the second direct current bus 32, and the second end of the second connection wire of the second sub-ring network 42 is connected with the negative terminal of the tail end connection end of the second direct current bus 32.
In the embodiment of the present utility model, the first connection line and the second connection line of the first sub-ring network 41 and the second sub-ring network 42 are cables.
As shown in fig. 2, the head and tail terminals of the medium-voltage dc bus 30 are connected to form a ring network, and when any break point occurs in the series circuit, the ring network directly ensures continuous power supply, thereby avoiding losing the dc power supply and ensuring the reliability and stability of power supply.
Further, in some embodiments, the dc control power supply loop of the medium voltage power distribution system further includes: and a power-off detection circuit. The power-off detection circuit is connected with the medium-voltage direct-current bus 30, and is used for carrying out power-on detection on the medium-voltage direct-current bus 30 and outputting a power-off detection signal when the medium-voltage direct-current bus 30 is powered off. It should be noted that, the power failure detection circuit adopted in the embodiment of the present utility model may be a common power failure detection circuit in a medium voltage power distribution system, and the specific circuit structure and the specific composition form thereof may refer to the existing medium voltage power distribution system.
Further, in some embodiments, the dc control power supply loop of the medium voltage power distribution system further includes: and an alarm circuit. The alarm circuit is connected with the power-off detection circuit and is used for outputting an alarm signal according to the power-off detection signal. It should be noted that, the power outage detection circuit adopted in the embodiment of the present utility model may be a common alarm circuit in a medium voltage power distribution system, and the specific circuit structure and the specific composition form thereof may refer to the existing medium voltage power distribution system. By providing the alarm circuit, the related personnel can be reminded of overhauling the medium-voltage direct-current bus 30.
According to the direct current control power supply loop of the medium voltage distribution system, the loop network 40 is additionally arranged, so that the terminals of the head and tail connecting ends of the 110V medium voltage direct current buses 30 in the medium voltage distribution system are connected through the cables to form the loop network, the reliability of the direct current of the medium voltage disc is improved on the premise that the original system functions are not changed, the normal operation and protection functions of the medium voltage equipment are not affected, and the reliability of station service and the safety of a nuclear power unit can be improved.
The utility model also provides a medium voltage power distribution system, which comprises: the embodiment of the utility model discloses a direct-current control power supply loop of a medium-voltage distribution system. Through setting up this middling pressure distribution system direct current control power supply return circuit, can reduce middling pressure distribution system fault rate, promoted middling pressure distribution system's availability. When the method is applied to the nuclear power plant, the reliability of the station service of the nuclear power plant and the safety of the unit can be improved.
The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same according to the content of the present utility model, and not to limit the scope of the present utility model. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
Claims (10)
1. A dc control power circuit for a medium voltage power distribution system, comprising: the device comprises a first power supply device, a second power supply device, a medium-voltage direct-current bus and a ring network loop;
the first power supply device is connected with the medium-voltage direct-current bus and used for providing a first power supply voltage for the medium-voltage direct-current bus;
the second power supply device is connected with the medium-voltage direct-current bus and is used for providing a second power supply voltage for the medium-voltage direct-current bus;
the ring network loop is connected with the medium-voltage direct-current bus and is connected with the medium-voltage direct-current bus in parallel, so that power is supplied through the ring network loop when the medium-voltage direct-current bus is powered off.
2. The medium voltage distribution system dc control power circuit of claim 1 wherein the medium voltage dc bus comprises: a first direct current bus and a second direct current bus;
the looped network loop includes: a first sub-ring network and a second sub-ring network;
the first sub-ring network is connected with the first direct current bus in parallel, and power is supplied through the first sub-ring network when the first direct current bus is powered off;
the second sub-ring network is connected with the second direct current bus in parallel, and when the second direct current bus is powered off, power is supplied through the second sub-ring network.
3. The medium voltage power distribution system dc control power circuit of claim 2 wherein the first dc bus comprises: a head end connection end and a tail end connection end;
the first sub-ring network includes: a first connection line and a second connection line;
the first end of the first connecting wire of the first sub-ring network is connected with the positive terminal of the head end connecting end of the first direct current bus, and the second end of the first connecting wire of the first sub-ring network is connected with the positive terminal of the tail end connecting end of the first direct current bus;
the first end of the second connecting wire of the first sub-ring network is connected with the negative terminal of the head end connecting end of the first direct current bus, and the second end of the second connecting wire of the first sub-ring network is connected with the negative terminal of the tail end connecting end of the first direct current bus.
4. The medium voltage power distribution system dc control power circuit of claim 2 wherein the second dc bus comprises: a head end connection end and a tail end connection end;
the second sub-ring network includes: a first connection line and a second connection line;
the first end of the first connecting wire of the second sub-ring network is connected with the positive terminal of the head end connecting end of the second direct current bus, and the second end of the first connecting wire of the second sub-ring network is connected with the positive terminal of the tail end connecting end of the second direct current bus;
the first end of the second connecting wire of the second sub-ring network is connected with the negative terminal of the head end connecting end of the second direct current bus, and the second end of the second connecting wire of the second sub-ring network is connected with the negative terminal of the tail end connecting end of the second direct current bus.
5. The medium voltage power distribution system dc control power circuit of claim 2, further comprising: the first alarm indication switch and the first electric equipment;
the first alarm indication switch is connected with the first direct current bus and is used for executing a turn-off action when the power supply of the first direct current bus is abnormal;
the first electric equipment is connected with the first direct current bus and is used for receiving the electric signals provided by the first direct current bus and outputting corresponding electric energy to downstream equipment.
6. The medium voltage power distribution system dc control power circuit of claim 2, further comprising: the second alarm indication switch and the second electric equipment;
the second alarm indication switch is connected with the second direct current bus and is used for executing a turn-off action when the power supply of the second direct current bus is abnormal;
the second electric equipment is connected with the second direct current bus and is used for receiving the electric signal provided by the first direct current bus and outputting corresponding electric energy to downstream equipment.
7. The medium voltage distribution system dc control power circuit of claim 1, further comprising: a power-off detection circuit;
the power-off detection circuit is connected with the medium-voltage direct-current bus and is used for conducting power-on detection on the medium-voltage direct-current bus and outputting a power-off detection signal when the medium-voltage direct-current bus is powered off.
8. The medium voltage distribution system dc control power circuit of claim 7, further comprising: an alarm circuit;
the alarm circuit is connected with the power-off detection circuit and is used for outputting an alarm signal according to the power-off detection signal.
9. The direct current control power supply circuit of a medium voltage distribution system according to any one of claims 1 to 8, wherein the first power supply means comprises: a first DC power supply; the second power supply device includes: a second DC power supply;
the first direct current power supply is connected with the medium voltage direct current bus and used for providing first direct current for the medium voltage direct current bus;
the second direct current power supply is connected with the medium voltage direct current bus and used for providing second direct current for the medium voltage direct current bus.
10. A medium voltage power distribution system, comprising: a medium voltage distribution system dc control power circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320263926.4U CN219247479U (en) | 2023-02-17 | 2023-02-17 | DC control power supply loop of medium-voltage distribution system and medium-voltage distribution system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320263926.4U CN219247479U (en) | 2023-02-17 | 2023-02-17 | DC control power supply loop of medium-voltage distribution system and medium-voltage distribution system |
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| CN219247479U true CN219247479U (en) | 2023-06-23 |
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| CN202320263926.4U Active CN219247479U (en) | 2023-02-17 | 2023-02-17 | DC control power supply loop of medium-voltage distribution system and medium-voltage distribution system |
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