CN204012683U - A kind of reverse power protection system for containing distributed power source power distribution network - Google Patents
A kind of reverse power protection system for containing distributed power source power distribution network Download PDFInfo
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- CN204012683U CN204012683U CN201420395284.4U CN201420395284U CN204012683U CN 204012683 U CN204012683 U CN 204012683U CN 201420395284 U CN201420395284 U CN 201420395284U CN 204012683 U CN204012683 U CN 204012683U
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Abstract
The utility model discloses a kind of reverse power protection system for containing distributed power source power distribution network, comprise main control chip, current transformer and ammeter, current transformer is for gathering the electric current on distributed power source and power distribution network line, current transformer is connected with ammeter, the electric current that current transformer gathers is by ammeter detected magnitude and direction, after changing by AD converter, be transferred to main control chip, main control chip is connected with circuit breaker performance element by drive circuit, the circuit breaker executive signal that main control chip sends sends to the circuit breaker performance element on distributed power source and power distribution network line after amplifying by drive circuit, the utility model system configuration is simple, easy to use, improves maintainer's personal safety level of protection, also can be used for generator and enters the occasions such as protection mutually.
Description
Technical field
The utility model relates to a kind of reverse power protection system for containing distributed power source power distribution network, belongs to the grid-connected resist technology of distributed power source field.
Background technology
In recent years, the enhancing of the rising of the minimizing of non-renewable resources, energy demand, environmental consciousness has expedited the emergence of a large amount of distributed power sources and micro-electrical network.Distributed power source refers to and is positioned near load, and installation small scale accesses the power supply of low and medium voltage distribution network nearby.Distributed energy can not only be as stand-by power supply in the time of electricity shortage, and can meet area that centralized power generation cannot cover or the power requirement of urban area electrical network, just for these reasons, distributed energy is an indispensable part all the time in the development process of China's electric power system.Exploitation distributed power generation can make full use of the regenerative resource extensively existing with distributed form, improves efficiency of energy utilization, realizes energy-saving and emission-reduction.Distributed power source and corresponding micro-electrical network are incorporated to low-voltage network nearby, can reduce line loss, improve the electrical network end quality of power supply, and alleviation Voltage force improves electrical network anti-disaster ability, ensures the reliable power supply to responsible consumer.
For the distribution system of traditional distribution-free formula power supply, the trend flow direction of old power distribution network is one-way flow, radial.Basic staff is in the time of operation, and pulling open after the disconnecting link of both sides is the safety that can guarantee maintainer.But after distributed power source is connected to the grid, because the generating dutation of distributed power source is uncertain (the especially grid-connected project of 380V, do not participate in electrical network United Dispatching, by client's start and stop voluntarily), its start-stop time is subject to inside even from weather to a great extent, even if this has just caused circuit both sides to have obvious cut-off point, but on this circuit with distributed power source still likely to circuit power transmission, maintainer's operation remains unsafe.
Therefore; when preventing the maintenance of power distribution network to containing distributed power source; in not detecting of causing of the artificial origin situation such as whether all circuit breakers disconnect or island protect device is malfunctioning; distributed power source, is necessary, at the ad-hoc location of system, reverse power protection system is installed to the anti-power transmission of medium voltage network, the misoperation that reduces protective relaying device, the raising quality of power supply by power transformer.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of reverse power protection system for containing distributed power source power distribution network; when this system can realize the power distribution network maintenance to containing distributed power source; in not detecting of causing of the artificial origin situation such as whether all circuit breakers disconnect or island protect device is malfunctioning; cut off in time the power distribution network transmission inverse probability of distributed power source to Awaiting Overhaul, ensure maintainer's safety.
In order to solve the problems of the technologies described above, the technical solution of the utility model is:
A kind of reverse power protection system for containing distributed power source power distribution network, comprise main control chip, current transformer and ammeter, current transformer is for gathering the electric current on distributed power source and power distribution network line, current transformer is connected with ammeter, the electric current that current transformer gathers is by ammeter detected magnitude and direction, after changing by AD converter, be transferred to main control chip, main control chip is connected with circuit breaker performance element by drive circuit, the circuit breaker executive signal that main control chip sends sends to the circuit breaker performance element on distributed power source and power distribution network line after amplifying by drive circuit, circuit breaker on distributed power source and power distribution network line is disconnected, cut off distributed power source and transmit inverse probability to power distribution network.
The utility model system configuration is simple, easy to use, can improve maintainer's personal safety level of protection, enters the occasions such as protection mutually but also can be used for generator.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the existing power distribution network schematic diagram containing distributed power source.
Fig. 2 is the power distribution network fundamental diagram that contains the utility model system.
Fig. 3 is the schematic diagram of the utility model system.
Embodiment
As shown in Figure 1, dotted line frame A represents the power distribution network of Awaiting Overhaul, in the power distribution network of Awaiting Overhaul, ellipse 1,2 ... n, for being connected to foundation to protect device, distributed power source and the load etc. above this power distribution network.N+1 oval distributed power source and load for amplifying, as research object.When owing to artificially not detecting or the malfunctioning circuit breaker three that causes of island protect does not disconnect the power distribution network power-off at Awaiting Overhaul in time; so in the time of maintenance; distributed power source can, to the power distribution network transmission inverse probability of the Awaiting Overhaul without electric, will cause very large potential safety hazard to the maintainer of the power distribution network overhauling.
As shown in Figure 2, on the branch road of the circuit breaker three being connected with power distribution network at distributed power source, increase the utility model protection system on the basis of Fig. 1, as the dotted line frame B in Fig. 2 is the utility model protection system.
As shown in Figure 3; the utility model protection system comprises current transformer, ammeter, AD converter; current transformer in current transformer circuit is for gathering the electric current on distributed power source and power distribution network line; current transformer is connected with ammeter; the electric current that current transformer gathers, by ammeter detected magnitude and direction, is transferred to main control chip after changing by AD converter.
Main control chip is connected with circuit breaker performance element by drive circuit, the circuit breaker executive signal that main control chip sends sends to the circuit breaker performance element on distributed power source and power distribution network line after amplifying by drive circuit, circuit breaker (being the circuit breaker three in Fig. 2) on distributed power source and power distribution network line is disconnected, cut off distributed power source and transmit inverse probability to power distribution network.
The utility model active detecting in the time of power distribution network power-off flows through the size and Orientation of the electric current of distributed power source, has inverse probability to flow to the power distribution network of Awaiting Overhaul, cut-off breaker three by force.Concrete decision logic is: the utility model protection system is in the time the power distribution network of the reverse inflow Awaiting Overhaul of electric current being detected; indicate that power flows into power distribution network from distributed power source; this power is regarded as inverse probability by main control chip, thereby causes reverse power protection action.
Above-described embodiment limits the utility model never in any form, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops in protection range of the present utility model.
Claims (1)
1. the reverse power protection system for containing distributed power source power distribution network, it is characterized in that comprising main control chip, current transformer and ammeter, current transformer is for gathering the electric current on distributed power source and power distribution network line, current transformer is connected with ammeter, the electric current that current transformer gathers is by ammeter detected magnitude and direction, after changing by AD converter, be transferred to main control chip, main control chip is connected with circuit breaker performance element by drive circuit, the circuit breaker executive signal that main control chip sends sends to the circuit breaker performance element on distributed power source and power distribution network line after amplifying by drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420395284.4U CN204012683U (en) | 2014-07-16 | 2014-07-16 | A kind of reverse power protection system for containing distributed power source power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420395284.4U CN204012683U (en) | 2014-07-16 | 2014-07-16 | A kind of reverse power protection system for containing distributed power source power distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204012683U true CN204012683U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420395284.4U Expired - Fee Related CN204012683U (en) | 2014-07-16 | 2014-07-16 | A kind of reverse power protection system for containing distributed power source power distribution network |
Country Status (1)
| Country | Link |
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| CN (1) | CN204012683U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111199292A (en) * | 2018-10-31 | 2020-05-26 | 法国电力公司 | Ensuring safe maintenance in a low voltage network of a power distribution system |
| CN111579863A (en) * | 2020-05-25 | 2020-08-25 | 中国华电科工集团有限公司 | Circuit protection device and distributed energy supply system |
-
2014
- 2014-07-16 CN CN201420395284.4U patent/CN204012683U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111199292A (en) * | 2018-10-31 | 2020-05-26 | 法国电力公司 | Ensuring safe maintenance in a low voltage network of a power distribution system |
| CN111199292B (en) * | 2018-10-31 | 2023-10-13 | 法国电力公司 | Ensuring safe maintenance in a low voltage network of a power distribution system |
| CN111579863A (en) * | 2020-05-25 | 2020-08-25 | 中国华电科工集团有限公司 | Circuit protection device and distributed energy supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20170716 |