CN214281034U - On-line type direct current power supply system feeder fault isolation device - Google Patents
On-line type direct current power supply system feeder fault isolation device Download PDFInfo
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- CN214281034U CN214281034U CN202120580585.4U CN202120580585U CN214281034U CN 214281034 U CN214281034 U CN 214281034U CN 202120580585 U CN202120580585 U CN 202120580585U CN 214281034 U CN214281034 U CN 214281034U
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- 238000002955 isolation Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 54
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000005465 channeling Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- 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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- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The utility model discloses a fault isolation device for a feeder circuit of a direct current power supply system, which comprises a generator, an isolation type electric energy transmission unit, a straight-through type electric energy transmission unit, an input unit and an output unit; the input unit is respectively connected to the isolated electric energy transmission unit and the straight-through electric energy transmission unit; the input unit is respectively connected to the isolated electric energy transmission unit and the straight-through electric energy transmission unit; the isolated electric energy transmission unit and the straight-through electric energy transmission unit are connected in parallel. The utility model discloses can initiatively realize fault monitoring to keep apart trouble return circuit, and enable the load and do not lose the electricity, thereby guarantee direct current system safety and stability's operation.
Description
Technical Field
The utility model belongs to the direct current power supply system field, concretely relates to online direct current power supply system feeder fault isolation device.
Background
In a transformer substation or a power plant, a direct-current power supply system is used as a power supply for loads such as protection and control, and when power is lost, misoperation or refusal of the protection and control load can be caused, especially, the refusal can further cause paralysis of a local power grid, and the accident of the power grid is a major accident of the power grid. As a more reliable backup power source, some unreliable accidents have occurred in recent years, which mainly include the following two points:
1) when the alternating current power supply loses power, the storage battery cannot be used in time, so that the direct current system loses power;
2) due to the limitation of the monitoring device, when the direct current power supply system generates grounding, alternating current channeling or two groups of direct current channeling faults, a fault branch cannot be selected, or a specific position cannot be found after the fault branch is selected, so that the fault of a certain branch brings the fault of the whole direct current power supply system, such as the grounding-caused ground voltage deviation of the positive electrode and the negative electrode of a bus, the false operation risk brought by alternating current channeling, the overvoltage brought by the two groups of direct current channeling and the like.
Based on the above problems, some solutions are provided for some colleges, scientific research units, operation units and manufacturers, such as:
1) patent 201310668765.8 provides a "charge-discharge compensation system for series-connected storage battery pack", which realizes the compensation of the fault of the single storage battery by providing a charger for each single storage battery;
2) patent 201010598584.9 provides a "dc power system based on parallel connection of storage batteries", in which multiple sets of batteries are connected in parallel by using inverters, and when one or more batteries are failed, the failed storage battery can still provide power for the dc bus;
3) patent 201410316418.3 provides an "automatic zero-gap bypass system for battery pack", in which a monitoring and management unit and a bypass unit are provided on each single battery, and when a fault is detected in the single battery, the battery is automatically bypassed, so that the requirement that the battery pack formed by the single batteries without fault can continuously provide power is realized.
4) Patent CN201611074785.2 provides a "system for preventing DC power supply bus from losing voltage and its operation method", which is to group storage batteries and compensate the grouped storage batteries to the bus in a DC/DC boosting manner, so as to monitor and compensate possible DC bus voltage loss, and ensure the safe and stable operation of the DC system.
Although the above 4 patents monitor and compensate for the loss voltage to a certain extent, they all have their limitations, and the cost is high due to the addition of a large number of components.
5) Patent CN201721110424.9 provides a direct current power supply system feeder return circuit trouble isolating device, solves in the direct current power supply system operation and maintenance engineering of transformer substation or power plant, can keep apart the trouble return circuit, can make the load not lose the device that the electricity provided again, but this trouble isolating device only keeps apart the trouble return circuit through DC/DC alone, can not automatic identification and initiative isolation, can not realize online monitoring and isolation, has the limitation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome prior art's weak point, provide an online direct current power supply system feeder trouble isolating device to can initiatively realize fault monitoring in the hope, and keep apart trouble return circuit, and enable the load and do not lose the electricity, thereby guarantee direct current system safety and stability's operation.
The utility model discloses a reach above-mentioned utility model purpose, adopt following technical scheme:
the utility model relates to an online direct current power supply system feeder fault isolation device's characteristics include: the device comprises a controller, an isolated electric energy transmission unit, a straight-through electric energy transmission unit, an input unit and an output unit;
the input unit comprises two groups of input terminals and is respectively connected with the input ends of the isolated electric energy transmission unit and the straight-through electric energy transmission unit;
the isolated electric energy transmission unit is used for electrically isolating and transmitting electric energy and is connected with the straight-through electric energy transmission unit in parallel;
the through type electric energy transmission unit comprises an electric element with a mechanical breakpoint;
the output unit also comprises two groups of input terminals and is respectively connected with the output ends of the isolated electric energy transmission unit and the straight-through electric energy transmission unit;
the controller includes: the system comprises a direct current voltage acquisition circuit, an alternating current voltage acquisition circuit, a direct current acquisition circuit, an alternating current acquisition circuit, a state input acquisition circuit, an output and control circuit and a central control circuit;
the input ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the input unit, and the output ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the output unit;
the state input acquisition circuit is connected with the isolated electric energy transmission unit;
the output and control circuit is connected with the straight-through type electric energy transmission unit;
the central control circuit is used for coordinating the operation of each unit.
The on-line type direct current power supply system feeder line fault isolation device of the utility model is also characterized in that,
the isolated electric energy transmission unit comprises at least one isolated DC/DC device;
the through type electric energy transmission unit comprises at least one breaker, and/or contactor, and/or relay, and/or isolating switch, and/or solid-state switch.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a setting has the transmission electric energy, and the component of input/output in electric isolation, can be in transformer substation or power plant direct current electrical power generating system operation maintenance engineering, under the condition that makes the load not lose the electricity, automatic identification and initiative keep apart trouble return circuit, and install simple easily realization, reduced equipment cost, have higher practicality.
Drawings
Fig. 1 is a technical schematic diagram of the fault isolation device of the present invention;
fig. 2 is a technical schematic diagram of the controller of the present invention;
fig. 3 is a schematic diagram of the connection between the isolated power transmission unit and the through power transmission unit according to the present invention.
Detailed Description
In this embodiment, as shown in fig. 1, an online dc power supply system feeder fault isolation apparatus may be installed in a dc screen, and includes: the device comprises a controller, an isolated electric energy transmission unit, a straight-through electric energy transmission unit, an input unit and an output unit;
the input unit comprises two groups of input terminals, the two groups of input terminals can be one element or two elements, in the specific implementation, one group or two groups of wiring terminals are used for input wiring of a user, wherein, as shown in fig. 3, the two groups of wiring terminals are preferably adopted and are respectively connected with the input ends of the isolated electric energy transmission unit and the through type electric energy transmission unit;
the isolated type electric energy transmission unit comprises at least one isolated type DC/DC device, is used for realizing electric energy transmission from the input unit to the output unit and electric isolation in the transmission process, and is connected with the straight-through type electric energy transmission unit in parallel; the parallel connection is important, and in a normal power supply state, electric energy is supplied by the through type electric energy transmission unit through control, and in a fault state, the electric energy is supplied by the isolation type electric energy transmission unit through control.
The through type electric energy transmission unit comprises at least one controllable electric element with a mechanical breakpoint; for example, at least one circuit breaker, and/or contactor, and/or relay, and/or disconnector, and/or solid state switch, or a combination of the above.
The output unit also comprises two groups of input terminals, and the two groups of input terminals can be one element or two elements; in specific implementation, the device can be a group of or two groups of wiring terminals for output wiring of users, wherein a group of wiring terminals is preferably adopted and is respectively connected with the output ends of the isolated type electric energy transmission unit and the through type electric energy transmission unit;
as shown in fig. 2, the controller is a core of the apparatus, and is used for implementing coordinated control of the apparatus as a whole, and includes: the system comprises a direct current voltage acquisition circuit, an alternating current voltage acquisition circuit, a direct current acquisition circuit, an alternating current acquisition circuit, a state input acquisition circuit, an output and control circuit and a central control circuit; the operation of each unit, especially the operation of the isolated type electric energy transmission unit and the straight-through type electric energy transmission unit, is coordinated through collection, operation, logic judgment and output.
The input ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the input unit, and the output ends of the direct current voltage acquisition circuit, the alternating current acquisition circuit and the alternating current acquisition circuit are respectively connected with the output unit;
the state input acquisition circuit is connected with the isolated electric energy transmission unit;
the output and control circuit is connected with the through type electric energy transmission unit.
Claims (2)
1. An online direct current power supply system feeder fault isolation device, its characterized in that includes: the device comprises a controller, an isolated electric energy transmission unit, a straight-through electric energy transmission unit, an input unit and an output unit;
the input unit comprises two groups of input terminals and is respectively connected with the input ends of the isolated electric energy transmission unit and the straight-through electric energy transmission unit;
the isolated electric energy transmission unit is used for electrically isolating and transmitting electric energy and is connected with the straight-through electric energy transmission unit in parallel;
the through type electric energy transmission unit comprises an electric element with a mechanical breakpoint;
the output unit also comprises two groups of input terminals and is respectively connected with the output ends of the isolated electric energy transmission unit and the straight-through electric energy transmission unit;
the controller includes: the system comprises a direct current voltage acquisition circuit, an alternating current voltage acquisition circuit, a direct current acquisition circuit, an alternating current acquisition circuit, a state input acquisition circuit, an output and control circuit and a central control circuit;
the input ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the input unit, and the output ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the output unit;
the state input acquisition circuit is connected with the isolated electric energy transmission unit;
the output and control circuit is connected with the straight-through type electric energy transmission unit;
the central control circuit is used for coordinating the operation of each unit.
2. A feeder fault isolation apparatus for an online dc power supply system as claimed in claim 1, wherein:
the isolated electric energy transmission unit comprises at least one isolated DC/DC device;
the through type electric energy transmission unit comprises at least one breaker, and/or contactor, and/or relay, and/or isolating switch, and/or solid-state switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120580585.4U CN214281034U (en) | 2021-03-23 | 2021-03-23 | On-line type direct current power supply system feeder fault isolation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120580585.4U CN214281034U (en) | 2021-03-23 | 2021-03-23 | On-line type direct current power supply system feeder fault isolation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214281034U true CN214281034U (en) | 2021-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120580585.4U Active CN214281034U (en) | 2021-03-23 | 2021-03-23 | On-line type direct current power supply system feeder fault isolation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214281034U (en) |
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2021
- 2021-03-23 CN CN202120580585.4U patent/CN214281034U/en active Active
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