CN216720910U - Direct-current power supply circuit - Google Patents

Direct-current power supply circuit Download PDF

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Publication number
CN216720910U
CN216720910U CN202122918506.9U CN202122918506U CN216720910U CN 216720910 U CN216720910 U CN 216720910U CN 202122918506 U CN202122918506 U CN 202122918506U CN 216720910 U CN216720910 U CN 216720910U
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bus
direct current
power supply
current
charging
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CN202122918506.9U
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Inventor
李传东
赵伟帆
赵兴永
徐昭
徐亮
梁鹏
李传红
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Shandong Iron and Steel Co Ltd
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Shandong Iron and Steel Co Ltd
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Abstract

The utility model discloses a DC power supply circuit, which comprises: the system comprises a low-voltage alternating current bus, a charging module, a direct current charging bus, a direct current master control bus and a direct current sectional control bus. The low-voltage alternating current bus is used for connecting an external alternating current inlet wire; the charging module is connected with the low-voltage alternating current bus, and can receive alternating current input by the low-voltage alternating current bus and output direct current; the direct current charging bus is connected with the charging module and can receive direct current from the charging module; the direct current master control bus is connected with the direct current charging bus and can receive direct current from the direct current charging bus; the direct current subsection control bus is used for connecting external electric equipment, the direct current subsection control bus is connected with the direct current main control bus, and the direct current subsection control bus can transmit direct current from the direct current main control bus to the external electric equipment. The circuit can meet the requirement of safe power utilization, and has the advantages of low investment, simple and convenient wiring operation, low failure rate of the direct-current power supply and the like.

Description

Direct-current power supply circuit
Technical Field
The utility model relates to the technical field of direct-current power supplies of transformer substations, in particular to a direct-current power supply circuit.
Background
The transformer substation is a place for converting voltage and current, receiving electric energy and distributing electric energy in an electric power system. The direct current power supply is an important component of a transformer substation, is used as a main working power supply of secondary equipment in the transformer substation, and is an important power supply of devices for control, protection, signal indication, automation devices, emergency lighting and the like of the transformer substation. The direct current power supply can provide powerful guarantee for continuous and stable operation of equipment, and can be used as an emergency power supply for protecting, controlling and normally operating a communication device under the condition of full stop of an electricity utilization accident of an alternating current station in the station.
The circuit breaker of early transformer substation adopts electromagnetic operating mechanism more, and circuit breaker closing current is great, and especially partial inlet wire circuit breaker closing current is higher, can cause the direct current change great when circuit breaker closing operation, influences direct current supply voltage reliable and stable. In order to meet the requirement of direct current power supply equipment on the stability and reliability of direct current, a special direct current closing bus and a special control bus are designed. And a silicon chain voltage reduction device is arranged between the closing bus and the control bus, so that the silicon chain voltage reduction grouping control switching can be realized in a manual mode or an automatic mode, and the direct current power supply reliability is improved.
In the prior art, as shown in fig. 1, two main and slave hot backup mains supplies respectively provide three-phase ac power to an intelligent high-frequency switching power supply module through an automatic switching device system. The charging module converts three-phase alternating current into controllable direct current which accords with the charging characteristic of the storage battery pack, one path of the controllable direct current is connected to the storage battery pack to carry out intelligent charging and floating charging on the storage battery pack, and the other path of the controllable direct current is connected to a closing loop to supply power to the storage battery pack. The power supply module can convert the three-phase alternating current into standard 220V direct current and supply power to the control loop through the control feeder circuit breaker. Under the normal working condition, the storage battery pack is in a floating charging state, and when the breaker is switched on and off, the charging module and the storage battery pack are connected in parallel to provide instantaneous time division and switching-on heavy current. The two ends of the silicon chain voltage reduction unit are respectively connected to the output end of the charging module and the output end of the power supply module, under the normal condition, the silicon chain voltage reduction unit is in a hot standby state, and when the power supply module breaks down or is in alternating current power failure, the storage battery and the charging module supply power to the control loop through voltage reduction of the silicon chain voltage reduction unit. When the alternating current is cut off, all the direct current load loops are powered by the storage battery pack. In addition, closing circuit and control circuit all are connected with insulating monitoring unit, and insulating monitoring unit can patrol and examine each branch road insulation condition in real time. The alternating current distribution unit, the charging module, the power supply module, the storage battery pack, the silicon chain voltage reduction unit, the closing loop and the control loop are all connected to the monitoring device, the monitoring device can achieve system management, control and alarming, and meanwhile, the monitoring device is communicated with the background monitoring system to form a comprehensive automatic system. However, the silicon chain voltage reduction unit can improve the complexity of the whole wiring, increase the manufacturing cost of equipment, and simultaneously improve the difficulty of operation, so that the silicon element is likely to be broken down or internally opened due to transient overvoltage in the running process of the direct current system, the reliability of power supply of the direct current system is affected, the failure rate is improved, and the potential safety hazard is greatly improved.
SUMMERY OF THE UTILITY MODEL
In order to solve some or all technical problems in the prior art, the utility model provides a direct current power supply circuit.
The technical scheme of the utility model is as follows:
a dc power supply circuit comprising:
the low-voltage alternating current bus is used for connecting an external alternating current inlet wire;
the charging module is connected with the low-voltage alternating current bus, and can receive alternating current input by the low-voltage alternating current bus and output direct current;
the direct current charging bus is connected with the charging module and can receive direct current from the charging module;
the direct current master control bus is connected with the direct current charging bus through a first direct current breaker and can receive direct current from the direct current charging bus;
the direct current subsection control bus is used for being connected with external electric equipment, the direct current subsection control bus is connected with the direct current main control bus through a direct current breaker, and the direct current subsection control bus can transmit direct current from the direct current main control bus to the external electric equipment.
Optionally, the dc power supply circuit further includes a storage battery pack connected to the dc bus via an isolation switch, and the storage battery pack is capable of providing dc power to the dc bus.
Optionally, a battery fuse is further arranged between the storage battery pack and the direct current main control bus.
Optionally, the number of the charging modules is M, where M is a positive integer less than or equal to 7.
Optionally, the low-voltage alternating-current bus with still be provided with three-phase alternating-current circuit breaker between the module of charging, wherein, the low-voltage alternating-current bus includes A looks bus, B looks bus, C looks bus and neutral conductor N, A looks bus B looks bus with C looks bus connects gradually the A, B, C three phase current's of three-phase alternating-current circuit breaker one end, A, B, C three phase current's the other end is connected to the input that exchanges of module of charging.
Optionally, the dc output of the charging module includes a positive output and a negative output, the positive output and the negative output are respectively connected to the positive row and the negative row of the dc charging bus, the positive row and the negative row of the dc charging bus are respectively connected to the positive row and the negative row of the dc general control bus through the first dc circuit breaker, and the positive row and the negative row of the dc general control bus are respectively connected to the positive row and the negative row of the dc sectional control bus through the dc circuit breaker.
Optionally, an insulation inspection device is arranged between the positive row and the negative row of the direct current bus.
Optionally, the number of the dc segmented control buses is at least two, and a bus bar interconnection isolating switch is connected between adjacent dc segmented control buses.
Optionally, the number of the dc segmented control masters is less than or equal to 16.
Optionally, the charging module is further connected with a master control device, the master control device is provided with a monitor, and the monitor can monitor the charging module and can alarm and record when the charging module breaks down or has abnormal voltage.
The technical scheme of the utility model has the following main advantages:
the direct current power supply circuit provided by the utility model is provided with a charging module, three-phase alternating current can be rectified into direct current through the charging module, then the direct current is transmitted to a direct current charging bus by the charging module, the direct current is transmitted to a direct current master control bus through a direct current breaker by the direct current charging bus, the direct current master control bus is respectively connected to a direct current I-section control bus and a direct current II-section control bus through the direct current breaker, and finally, each direct current power supply load is respectively supplied with power through each feed-out direct current breaker on the direct current I-section control bus and the direct current II-section control bus. In addition, the direct current master control bus is also connected with a storage battery pack, and when the alternating current power supply loses power, the storage battery pack can supply power to the direct current master control bus so as to ensure that the circuit can normally run. Therefore, the direct-current power supply circuit can meet the requirement of direct-current power supply load safety power utilization, ensures that a direct-current power supply system is reliable in power supply operation, and has the advantages of small investment, simple and convenient wiring operation, low direct-current power supply failure rate and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic structural diagram of a dc power supply circuit in the prior art;
fig. 2 is a schematic structural diagram of a dc power supply circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the utility model, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the utility model is described in detail below with reference to the accompanying drawings.
In one embodiment according to the present invention, there is provided a direct current power supply circuit capable of converting alternating current into direct current and transmitting the direct current to a consumer. The direct-current power supply circuit can meet the requirement of direct-current power supply load safety power utilization, can ensure the stable operation of a direct-current power supply system, can simplify wiring operation, reduces the fault rate, and can reduce investment cost.
Specifically, as shown in fig. 2, the dc power supply circuit in this embodiment includes a low-voltage ac bus, a charging module, a dc charging bus, a dc master bus, and a dc segment control bus.
The low-voltage alternating current bus is used for connecting an external alternating current inlet wire and can receive alternating current input from the external alternating current inlet wire. The alternating current incoming line comprises three phase lines and a neutral line N, and correspondingly, the low-voltage alternating current bus comprises an A-phase bus TMA, a B-phase bus TMB, a C-phase bus TMC and a neutral line TMN which can be respectively connected with the alternating current incoming line.
The charging module is connected with the low-voltage alternating current bus, and the charging module can receive alternating current input by the low-voltage alternating current bus and can output direct current. In this embodiment, a three-phase ac circuit breaker is further disposed between the low-voltage ac bus and the charging module, the a-phase bus TMA, the B-phase bus TMB, and the C-phase bus TMC in the low-voltage ac bus are sequentially connected to one end of A, B, C three-phase power supply of the three-phase ac circuit breaker, and the other end of A, B, C three-phase power supply is connected to the ac input end of the charging module, so as to implement transmission of ac power.
Further, the number of the charging modules is M, where M is a positive integer less than or equal to 7.
For example, in fig. 2, the charging modules in the present embodiment have N blocks, which are numbered 1N1, 1N2, and up to 1Nn in this order. The charging module 1N1 is connected to the low-voltage ac bus via a three-phase ac disconnector 1MK1, and so on, and the charging module 1Nn is connected to the low-voltage ac bus via a three-phase ac disconnector 1 MKn. It can be understood that the low-voltage ac busbars TMA, TMB, TMC are connected to one end of the A, B, C three-phase power supply of the three-phase ac breaker 1MK1, and the other end of the A, B, C three-phase power supply is connected to the ac input of the charging module 1N 1; the low-voltage ac busbars TMA, TMB, TMC are connected to one end of the A, B, C three-phase power supply of the three-phase ac circuit breaker 1MKn, and the other end of the A, B, C three-phase power supply is connected to the ac input terminal of the charging module 1 Nn. In this way, the low-voltage ac bus can be connected to the plurality of charging modules via the plurality of three-phase ac breakers.
The direct current charging bus is connected with the charging module, and the direct current charging bus can receive direct current from the charging module.
In this embodiment, the dc output terminals of all the charging modules include a positive output terminal and a negative output terminal, the dc charging bus includes a positive 1CM + and a negative 1CM-, and the positive output terminal and the negative output terminal of the charging module can be respectively connected to the positive 1CM + and the negative 1 CM-of the dc charging bus. That is to say, the positive output terminals and the negative output terminals of all the charging modules are connected to the positive row and the negative row of the dc charging bus, so as to realize the transmission of the dc power of all the charging modules.
The dc bus is connected to the dc charging bus via the first dc breaker 1CK1, and the dc bus can receive dc power from the dc charging bus.
In the embodiment, the direct current master control bus comprises a positive row 1KM + and a negative row 1KM-, and the positive row 1CM + and the negative row 1 CM-of the direct current charging bus can be respectively connected to the positive row 1KM + and the negative row 1 KM-of the direct current master control bus through a first direct current breaker 1CK1, so as to realize further transmission of direct current.
Preferably, an insulation inspection device IZN2 is further arranged between the positive row 1KM + and the negative row 1 KM-of the direct current master control bus so as to realize real-time sampling and monitoring of the voltage of the direct current master control bus.
The direct current subsection control bus is used for being connected with external electric equipment, the direct current subsection control bus is connected with the direct current main control bus through the direct current circuit breaker, and the direct current subsection control bus can transmit direct current from the direct current main control bus to the external electric equipment.
In the embodiment, the number of the direct current subsection control buses is at least two, and a bus connection isolating switch is connected and arranged between the adjacent direct current subsection control buses. Preferably, the number of the direct current segmented control masters is less than or equal to 16.
Illustratively, the direct-current segmented control bus comprises a direct-current segment I control bus and a direct-current segment II control bus, wherein the direct-current segment I control bus 1KM1+ and 1KM 1-is connected with a multi-path feed-out direct-current line, such as a first feed-out direct-current breaker KM1+, KM1-, a second feed-out direct-current breaker KM2+, KM2-, and an nth feed-out direct-current breaker KMn + and KMn-; the direct current II section control bus 1KM2+ and 1KM 2-has a multi-path direct current feeding line, such as a first direct current feeding breaker KM1+ and KM1-, a second direct current feeding breaker KM2+ and KM2-, and a direct current breaker KMn + and KMn-are fed out at the nth.
A bus communication isolating switch LK is arranged between the direct current I section control bus 1KM1+, 1KM 1-and the direct current II section control bus 1KM2+, 1KM 2-.
The direct current I section control bus 1KM1+ and 1KM 1-can be connected to the positive row 1KM + and the negative row 1 KM-of the direct current main control bus through a second direct current breaker FK 1; the direct current II-section bus 1KM2+ and 1KM 2-can be connected to the positive row 1KM + and the negative row 1 KM-of the direct current bus through a third direct current breaker FK 2.
Further, the direct current power supply circuit also comprises a storage battery pack, the storage battery pack is connected to the direct current master control bus through an isolating switch, and the storage battery pack can provide direct current for the direct current master control bus. In addition, in order to ensure safety, a battery fuse is arranged between the storage battery pack and the direct current main control bus.
In the present embodiment, the positive row 1KM + and the negative row 1 KM-of the dc bus are connected to the battery pack via the disconnecting switch 1DK1 and the battery fuses 1RD1 and 1RD 2. In a specific embodiment, the voltage of the substation dc power supply is 220V, and the battery capacity of the battery pack may be 200 Ah. Therefore, for a storage battery pack with a single battery rated voltage of 2V, only 104 batteries are required to be configured; for a storage battery pack with a single battery rated at 12V, only 17 batteries are required to be configured. The bus voltage is about 230V, and the technical and safety requirements of direct current equipment on a direct current power supply can be met.
Preferably, the charging module is further connected with a master control device 1ZN1, the master control device 1ZN1 is provided with a monitor, the monitor can monitor the charging module, can give an alarm and record when the charging module breaks down or has abnormal voltage, and can send related information to a background server.
In order to ensure that the direct current power supply circuit can effectively operate, the low-voltage alternating current bus can be connected with alternating current inlet wires of two paths of low-voltage alternating current power supplies, and when one path of alternating current power supply loses power, the other path of alternating current power supply can be automatically or manually switched to supply power.
In addition, the ac bus and the dc bus in the present embodiment may be both copper bus bars.
The dc power supply circuit in this embodiment has the following advantages:
the direct current power supply circuit provided by the utility model is provided with a charging module, three-phase alternating current can be rectified into direct current through the charging module, then the charging module firstly transmits the direct current to a direct current charging bus, the direct current charging bus transmits the direct current to a direct current master bus through a direct current breaker, the direct current master bus is respectively connected to a direct current I-section control bus and a direct current II-section control bus through the direct current breaker, and finally, each direct current power supply load is respectively supplied with power through each feed-out line direct current breaker on the direct current I-section control bus and the direct current II-section control bus. In addition, the direct current master control bus is also connected with a storage battery pack, and when the alternating current power supply loses power, the storage battery pack can supply power to the direct current master control bus so as to ensure that the circuit can normally run. Therefore, the direct-current power supply circuit can meet the requirement of direct-current power supply load safety power utilization, ensures that a direct-current power supply system is reliable in power supply operation, and has the advantages of small investment, simple and convenient wiring operation, low direct-current power supply failure rate and the like.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A dc power supply circuit, comprising:
the low-voltage alternating current bus is used for connecting an external alternating current inlet wire;
the charging module is connected with the low-voltage alternating current bus, and can receive alternating current input by the low-voltage alternating current bus and output direct current;
the direct current charging bus is connected with the charging module and can receive direct current from the charging module;
the direct current master control bus is connected with the direct current charging bus through a first direct current breaker and can receive direct current from the direct current charging bus;
the direct current subsection control bus is used for being connected with external electric equipment, the direct current subsection control bus is connected with the direct current main control bus through a direct current breaker, and the direct current subsection control bus can transmit direct current from the direct current main control bus to the external electric equipment.
2. The DC power supply circuit of claim 1, further comprising a battery pack connected to the DC bus via an isolator, the battery pack capable of providing DC power to the DC bus.
3. The dc power supply circuit of claim 2, wherein a battery fuse is further disposed between said battery pack and said dc bus bar.
4. The DC power supply circuit according to claim 1, wherein the number of the charging modules is M, wherein M is a positive integer less than or equal to 7.
5. A dc power supply circuit according to claim 1, wherein a three-phase ac circuit breaker is further provided between the low-voltage ac bus and the charging module, wherein the low-voltage ac bus comprises an a-phase bus, a B-phase bus, a C-phase bus and a neutral line N, the a-phase bus, the B-phase bus and the C-phase bus are sequentially connected to one end of A, B, C three-phase power supply of the three-phase ac circuit breaker, and the other end of A, B, C three-phase power supply is connected to the ac input end of the charging module.
6. The DC power supply circuit according to claim 1, wherein the DC output terminal of the charging module comprises a positive output terminal and a negative output terminal, the positive output terminal and the negative output terminal are respectively connected with the positive row and the negative row of the DC charging bus, the positive row and the negative row of the DC charging bus are respectively connected to the positive row and the negative row of the DC general control bus via the first DC circuit breaker, and the positive row and the negative row of the DC general control bus are respectively connected to the positive row and the negative row of the DC sectional control bus via the DC circuit breaker.
7. The DC power supply circuit according to claim 6, wherein an insulation check device is disposed between the positive row and the negative row of the DC main control bus.
8. The direct-current power supply circuit according to claim 1, wherein the number of the direct-current segmented control buses is at least two, and a bus bar connection isolating switch is connected between adjacent direct-current segmented control buses.
9. The dc power supply circuit according to claim 8, wherein the number of the dc segment control bus is equal to or less than 16.
10. The direct-current power supply circuit according to claim 1, wherein the charging module is further connected with a master control device, the master control device is provided with a monitor, the monitor can monitor the charging module, and can give an alarm and record when the charging module has a fault or abnormal voltage.
CN202122918506.9U 2021-11-25 2021-11-25 Direct-current power supply circuit Active CN216720910U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122918506.9U CN216720910U (en) 2021-11-25 2021-11-25 Direct-current power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122918506.9U CN216720910U (en) 2021-11-25 2021-11-25 Direct-current power supply circuit

Publications (1)

Publication Number Publication Date
CN216720910U true CN216720910U (en) 2022-06-10

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CN202122918506.9U Active CN216720910U (en) 2021-11-25 2021-11-25 Direct-current power supply circuit

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