CN207010233U - A kind of transformer station direct current system based on DC/DC isolation modules - Google Patents
A kind of transformer station direct current system based on DC/DC isolation modules Download PDFInfo
- Publication number
- CN207010233U CN207010233U CN201721023260.6U CN201721023260U CN207010233U CN 207010233 U CN207010233 U CN 207010233U CN 201721023260 U CN201721023260 U CN 201721023260U CN 207010233 U CN207010233 U CN 207010233U
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- China
- Prior art keywords
- direct current
- isolation modules
- main screen
- transformer station
- isolation
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Abstract
The utility model discloses a kind of transformer station direct current system based on DC/DC isolation modules.The current existing transformer station direct current system based on DC/DC isolation modules, will cause the road DC load to lose power supply, the program may can also reduce the reliability of straight-flow system when DC/DC isolation module failures.The technical solution adopted in the utility model is：Two sides direct current main screen inlet wire is connected by breaker with a set of charging device and a set of batteries；It is connected between described two sides direct current main screen using bus connection switch；Each road outlet of two sides direct current main screen is respectively mounted DC/DC isolation modules, then is connected by breaker with each face direct current split screen inlet wire；Each face direct current split screen outlet is connected with each DC load again by breaker.The utility model make earth fault coverage be limited in the DC load where direct current split screen in, straight-flow system reliability and earth fault search efficiency can be effectively improved.
Description
Technical field
Transformer station direct current system technical field is the utility model is related to, it is specifically a kind of to be based on DC/DC isolation modules
Transformer station direct current system.
Background technology
Transformer station direct current system provides work electricity for protective relaying device, control and operation circuit, communication system in station etc.
Source, it is the basis of electric power system control and protection, its reliable power supply is the important leverage of substation safety stable operation.Direct current system
System one point earth occurs mainly in the positions such as dc bus, outdoor feeder cable, terminal box, is most common in straight-flow system
Fault type.Traditional DC system uses the connection of all DC equipments in the realization stations such as bus, cable, switch, between each other
Electrical isolation is not carried out, any of which point earth fault can all travel to bus and All other routes, cause whole station both positive and negative polarity electric
The exception of pressure, if ground connection now occurs again in another point will form 2 short troubles, recoil simulator, relay can be caused to protect
The malfunction of shield and breaker, or cause short trouble between two points ground fault loop and cause the generation of major accident.Therefore, when straight
Streaming system occurs that during one-point grounding fault failure need to be eliminated immediately, avoids more serious failure from occurring.
Insulated monitoring method common in straight-flow system has balanced bridge method, low-frequency ac injection method, leakage current inspection at present
Survey method etc., but because the route selection sensitivity present in existing microcomputer line selection apparatus is low, anti-distribution capacity interference performance deficiency etc. is asked
Topic, causes earthing position correctly to be selected completely, now needs to take artificial drawing to earth fault coverage inner looping
Road method not only takes time and effort to search faulty line and may also result in Partial DC load transient-power failure.
It is existing at present to be based on DC/DC isolation modules in order to reduce the coverage of transformer station direct current system one point earth
Transformer station direct current system, DC/DC isolation modules are arranged on each direct current point/between main screen and the loop of DC load so that
Electrical isolation is produced between each DC load loop.But because DC/DC isolation modules itself are there is also potential faults, when DC/DC every
The road DC load will be caused to lose power supply during from module failure, therefore work as DC/DC isolation modules reliability level not enough
Gao Shi, the allocation plan may can also reduce the reliability of straight-flow system.On the other hand, due to DC load crowd in straight-flow system
It is more, if being respectively mounted DC/DC isolation modules in each DC load loop, it will greatly increase equipment investment and maintenance work amoun.
Utility model content
In view of this, the utility model provides a kind of improved transformer station direct current system based on DC/DC isolation modules, uses
In solving the problems, such as that one-point grounding fault coverage is big in traditional transformer station direct current system, trouble shoot is difficult and existing
Transformer station direct current system based on DC/DC isolation modules is to the reliability lifting deficiency that effect is limited, equipment investment is costly.
To achieve the above object, the technical solution adopted in the utility model is as follows：A kind of change based on DC/DC isolation modules
Electric station DC system, it includes two sets of charging devices, two sets of batteries, two sides direct current main screen and some direct current split screens, broken
Road device and DC/DC isolation modules；
The said equipment is attached using following topological structure：
Two sides direct current main screen inlet wire is connected by breaker with a set of charging device and a set of batteries, charging dress
Put and provide power supply with batteries for direct current main screen；
It is connected between described two sides direct current main screen using bus connection switch, the mother when transformer station direct current system normal operation
Switch off, when the charging device and batteries of certain face direct current main screen need to carry out trouble hunting, by closing mother
Switch can be powered by another set of charging device and batteries to the direct current main screen；
Each road outlet of two sides direct current main screen is respectively mounted DC/DC isolation modules, then passes through breaker and each face direct current point
Screen inlet wire is connected, i.e., each face direct current split screen can be powered by two sides direct current main screen, wherein being normal power supply loop all the way, separately
It is stand-by power supply loop all the way；Each face direct current split screen outlet is connected with each DC load again by breaker, is DC load
It is powered.
According to the utility model, when one-point grounding fault occurs for a certain DC load loop, due to the electricity of DC/DC modules
Gas isolation features, earth fault coverage is limited in the direct current split screen where the DC load, whole without being diffused into
Individual straight-flow system, straight-flow system reliability and earth fault search efficiency can be effectively improved.
Further, the DC/DC isolation modules use the full-bridge DC/DC converters containing high-frequency isolation transformer, can
DC/DC converters both ends are made to produce electrical isolation.
Further, the input and output voltage ratio of the DC/DC isolation modules is 1:1.
Implement the utility model, have the advantages that：（1）Reduce two points ground fault probability.Ground connection event occurs for any place
Whole straight-flow system is not diffused into during barrier, and is limited in the direct current split screen residing for earth point, in different direct current split screens
Generation one point earth will not cause two points ground fault failure.（2）Reduce protection misoperation probability.Distribution is electric between reducing different circuits
The parallel connection of appearance, reduce the probability of happening of protection misoperation caused by distribution capacity electric discharge.（3）Improve failure line selection accuracy rate.
By the way that insulating monitor is respectively configured in different direct current split screens, the distributed insulation prison between different direct current split screens is realized
Examine, therefore one-point grounding fault seeking scope can be reduced, effectively increase failure line selection accuracy rate and reduce failure line selection work
Amount.（4）Because direct current split screen is connected by DC/DC isolation modules with two sides direct current main screen, as wherein normal power supply backflow DC/DC
During isolation module failure, another direct current main screen can be quickly switched into by switching manipulation and is powered, therefore the utility model phase
It is higher that the scheme reliability in each DC load loop is installed on compared with DC/DC isolation modules, and greatly reduces DC/DC isolation
The installation number and maintenance of module.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment transformer station direct current system.
Embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Referring to Fig. 1, a kind of transformer station direct current system based on DC/DC isolation modules provided by the utility model, it is by 2 sets
Charging device, 2 sets of batteries, 2 face direct current main screens, 4 face direct current split screens, 8 DC/DC isolation modules, 80 road DC loads, 92
Individual breaker and 1 bus connection switch composition.
In transformer station direct current system, two sides direct current main screen inlet wire passes through breaker and a set of charging device and a set of electric power storage
Pond group is connected, for providing power supply for direct current main screen；It is connected between the direct current main screen of two sides using bus connection switch, works as straight-flow system
Bus connection switch disconnects during normal operation, when the charging device and batteries of certain face direct current main screen need to carry out trouble hunting
When, the direct current main screen can be powered by another set of charging device and batteries by closing bus connection switch；Two sides is straight
4 tunnel outlets of stream main screen are mounted on DC/DC isolation modules, then are connected by breaker with 4 face direct current split screen inlet wires, i.e., each
Face direct current split screen can be powered by two sides direct current main screen, wherein being normal power supply loop all the way, another way is returned for stand-by power supply
Road；DC/DC isolation modules use the full-bridge DC/DC converters containing high-frequency isolation transformer, and the input of DC/DC isolation modules
Output voltage ratio is 1:1, DC/DC converters both ends can be made to produce electrical isolation；4 face direct current split screens again respectively with 20 road direct currents
Load is connected, and dc source is provided for it.
In the former straight-flow system of DC/DC isolation modules is not installed, when a little connecing occurs in some loop of DC load
During earth fault, because both positive and negative polarity electric voltage exception occurs for whole straight-flow system, therefore need successively to return all 80 roads DC load
Road carries out microcomputer route selection or artificial open line method route selection operation.According to the utility model proposed based on DC/DC isolation modules
Straight-flow system, when one-point grounding fault occurs in some DC load loop, only this DC load loop is connected
Direct current split screen and the positive and negative pole tension in corresponding 20 road DC load loop abnormal, and direct current in other face direct current split screens occurs
Load is still up, and is unaffected.Now the DC load 1-20 loops that earth fault occurs need to only be carried out micro-
Machine route selection or artificial open line method route selection operation, route selection workload reduces 75% in theory, substantially increases earth fault choosing
Line efficiency.On the other hand, the scheme for DC/DC isolation modules being respectively mounted according to every DC load loop need to install 80 altogether
DC/DC isolation modules, and DC/DC isolation module allocation plans are proposed using the utility model, need to install 8 DC/DC every
From module, quantity is only the former 10%.
Although content of the present utility model is discussed in detail by above-described embodiment, but it should be appreciated that above-mentioned
Description is not considered as to limitation of the present utility model.After those skilled in the art have read the above, for this reality
All it will be apparent with new a variety of modifications and substitutions.Therefore, the scope of protection of the utility model should be by appended power
Profit is required to limit.
Claims (3)
1. a kind of transformer station direct current system based on DC/DC isolation modules, it is characterised in that it includes two sets of charging devices, two
Cover batteries, two sides direct current main screen and some direct current split screens, breaker and DC/DC isolation modules；
The said equipment is attached using following topological structure：
Two sides direct current main screen inlet wire is connected by breaker with a set of charging device and a set of batteries；
It is connected between described two sides direct current main screen using bus connection switch, the bus connection switch when transformer station direct current system normal operation
Disconnect, when the charging device and batteries of certain face direct current main screen need to carry out trouble hunting, by closing bus connection switch
The direct current main screen can be powered by another set of charging device and batteries；
Each road outlet of two sides direct current main screen is respectively mounted DC/DC isolation modules, then is entered by breaker and each face direct current split screen
Line is connected；Each face direct current split screen outlet is connected with each DC load again by breaker.
2. the transformer station direct current system according to claim 1 based on DC/DC isolation modules, it is characterised in that described
DC/DC isolation modules use the full-bridge DC/DC converters containing high-frequency isolation transformer.
3. the transformer station direct current system according to claim 1 or 2 based on DC/DC isolation modules, it is characterised in that described
The input and output voltage ratio of DC/DC isolation modules is 1:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721023260.6U CN207010233U (en) | 2017-08-16 | 2017-08-16 | A kind of transformer station direct current system based on DC/DC isolation modules |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721023260.6U CN207010233U (en) | 2017-08-16 | 2017-08-16 | A kind of transformer station direct current system based on DC/DC isolation modules |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207010233U true CN207010233U (en) | 2018-02-13 |
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ID=61459157
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721023260.6U Expired - Fee Related CN207010233U (en) | 2017-08-16 | 2017-08-16 | A kind of transformer station direct current system based on DC/DC isolation modules |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207010233U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482613A (en) * | 2017-08-16 | 2017-12-15 | 国网浙江省电力公司电力科学研究院 | A kind of transformer station direct current system based on DC/DC isolation modules |
-
2017
- 2017-08-16 CN CN201721023260.6U patent/CN207010233U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482613A (en) * | 2017-08-16 | 2017-12-15 | 国网浙江省电力公司电力科学研究院 | A kind of transformer station direct current system based on DC/DC isolation modules |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180213 |
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| CF01 | Termination of patent right due to non-payment of annual fee |