CN202978379U - Direct current power supply system applied to 110KV substation - Google Patents
Direct current power supply system applied to 110KV substation Download PDFInfo
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- CN202978379U CN202978379U CN2012205756721U CN201220575672U CN202978379U CN 202978379 U CN202978379 U CN 202978379U CN 2012205756721 U CN2012205756721 U CN 2012205756721U CN 201220575672 U CN201220575672 U CN 201220575672U CN 202978379 U CN202978379 U CN 202978379U
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Abstract
The utility model relates to a direct current power supply system applied to an 110KV substation. The direct current power supply system applied to the 110KV substation comprises an alternating current input unit (1) and two groups of high frequency power supply modules (21).The high frequency power supply modules (21) are connected with the alternating current input unit (1). A circuit breaker (7) is arranged between two groups of high frequency power supply modules. Each high frequency power supply module (21) comprises a current equalization control unit. The current equalization control units are connected through a first current equalization line (41) and a second current equalization line. A bus couple switch (8) is arranged between the first current equalization line (41) and the second current equalization line (42). The circuit breaker is in linkage connection with the bus couple switch. According to the utility model, the current equalization control units and the current equalization lines are arranged, thus each high frequency power supply module shares the same load current; the problem that the thermal stress of one module unit is too large is avoided; the stability of the direct current power supply system is improved; and the linkage connection of the circuit breaker and the bus couple switch improves the security of the system.
Description
Technical field
The utility model relates to transformer station's technical field, relates in particular to a kind of DC power system for 110KV transformer station.
Background technology
In 110KV transformer station field, the DC power system major part is the DC control supply that becomes with charhing unit after the storage battery series connection.As shown in Figure 1, traditional DC power system is made of equipment such as batteries, charging device 4, direct current cabinet, monitoring units 3, being widely used in the fields such as various types of power plants and transformer station, is a kind of power-supply system that can guarantee reliable power supply under normal and various accident conditions.Batteries is the heart of direct current system, and batteries is to be composed in series to 108 joint storage batterys 22 by 9 joints in traditional DC power system, obtains corresponding 110V or 220V power supply.It is all no problem that this series system is made a false report every joint storage battery, every all intact connection of storage battery, the quality of whole batteries is determined by a joint storage battery wherein, needs to change whole group storage battery after wherein a certain Battery pack breaks down, and easily like this causes waste; And batteries some storage batterys can occur in when charging and is in and overcharges, some storage batterys are the phenomenon of underfill electricity also, and when discharge batteries load capacity bad, phenomenon easily appearred putting, can make like this life of storage battery not long, have more than is needed how long just discarded, discarded storage battery can be to environment.
In order to solve above-mentioned technological deficiency, existing prior art adopts storage battery parallel connection formation indirectly 110KV transforming plant DC power-supply system, this DC power system forms a modular unit by storage battery and HF switch usually, a plurality of modular units are in parallel by HF switch, HF switch can be converted into direct current with alternating current, realizes simultaneously discharging and recharging storage battery.But in above-mentioned technology, do not take the current-sharing measure between each modular unit, can not guarantee to share equal load current between each modular unit, easily cause the maldistribution of each modular unit thermal stress, make part of module power module overload, and then damage DC power system.
The utility model content
The technical problems to be solved in the utility model is the defective for prior art, has proposed a kind of DC power system that is used for 110KV transformer station of safety and reliability.
the technical scheme that its technical problem that solves the utility model adopts is: constructed a kind of DC power system for 110KV transformer station, comprise AC input cell and a plurality of high frequency power module, described high frequency power module electrically is connected with storage battery, described high frequency power module comprises input and output, the input of described high frequency power module is connected with described AC input cell, described a plurality of high frequency power module is divided into first group of high frequency power module and second group of high frequency power module, the output of described the first high frequency power module is connected with described the first bus, the output of described second group of high frequency power module is connected with described the second bus, described the first bus and described the second bus are provided with circuit breaker, described high frequency power module is used for receiving alternating current and the output DC that described AC input cell transmits, described high frequency power module also is used for described charge in batteries, described high frequency power module receives electric current and the output DC that described storage battery discharges when described AC input cell outage, described high frequency power module also comprises the sharing control unit, the sharing control unit of described first group of high frequency power module is connected by the first current equalizer, the sharing control unit of described second group of high frequency power module is connected by the second current equalizer, be provided with bus connection switch between described the first current equalizer and described the second current equalizer, described circuit breaker and described bus connection switch are connected.
In the above-mentioned DC power system that is used for 110KV transformer station, described DC power system also comprises the interchange monitoring unit, and described interchange monitoring unit is used for monitoring described AC input cell.
In the above-mentioned DC power system that is used for 110KV transformer station, described DC power system also comprises the high-frequency model monitoring unit, and described high-frequency model monitoring unit is used for monitoring described high frequency power module.
In the above-mentioned DC power system that is used for 110KV transformer station, described DC power system also comprises lightning protection unit.
In the above-mentioned DC power system that is used for 110KV transformer station, the rated voltage of described storage battery is 12V.
In the above-mentioned DC power system that is used for 110KV transformer station, described direct current is 220V.
In the above-mentioned DC power system that is used for 110KV transformer station, the alternating current that described AC input cell is carried is single-phase or three-phase.
Implement the beneficial effect that the utility model is used for the DC power system of 110KV transformer station: be provided with the sharing control unit between each high frequency power module, each sharing control unit is connected by current equalizer, sharing control unit and current equalizer are set can make each high frequency power module share identical load current, can avoid that wherein a modular unit thermal stress is excessive, thereby improve the stability of DC power system.Simultaneously be provided with circuit breaker between the first bus and the second bus, be provided with bus connection switch between the first current equalizer and the second current equalizer, short-circuiting device and bus connection switch are connected, and have improved Security of the system.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 is the DC power system circuit theory diagrams of 110KV transformer station in conventional art;
Fig. 2 is the circuit theory diagrams of a kind of DC power system preferred embodiment for 110KV transformer station of the utility model;
Embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
with reference to Fig. 2, Fig. 2 is the circuit theory diagrams of a kind of DC power system preferred embodiment for 110KV transformer station of the utility model, the modular unit 2 that comprises AC input cell 1 and 8 parallel connections in this DC power system, modular unit 2 comprises that high frequency power module 21 and rated voltage are the storage battery 22 of 12V, high frequency power module 21 comprises input 211 and output 212, AC input cell 1 is connected with the input 211 of high frequency power module 21, a plurality of high frequency power modules 21 are divided into first group of high frequency power module and second group of high frequency power module, the output 212 of first group of high frequency power module is connected with the first bus 61, the output 212 of second group of high frequency power module is connected with the second bus 62, be provided with circuit breaker 7 between the first bus 61 and the second bus 62, high frequency power module 21 is used for receiving the alternating current of AC input cell 1 transmission and exporting the 220V direct current, high frequency power module 21 also is used for storage battery 22 is charged.High frequency power module 21 can receive the electric current that storage battery 22 discharges when AC input cell 1 outage in addition, and this current conversion is become the output of 220V direct current.
High frequency power module 21 also comprises sharing control unit (not shown), the sharing control unit of first group of high frequency power module 21 is connected by the first current equalizer 41, the sharing control unit of second group of high frequency power module 21 is connected by the second current equalizer 42, be provided with bus connection switch 8 between the first current equalizer 41 and the second current equalizer 42, circuit breaker 7 and bus connection switch 8 are connected, namely when circuit breaker 7 disconnects, bus connection switch 8 is also along with disconnection, when circuit breaker 7 was closed, bus connection switch 8 was also along with closure.
The benefit that the first current equalizer 41 and the second current equalizer 42 are set is the load current that makes sharing of each modular unit 2 identical, can avoid wherein modular unit 2 thermal stress excessive and make the Systems balanth reduction.Simultaneously circuit breaker 7 and bus connection switch 8 are connected, have further improved Systems balanth.
Also be provided with in addition high-frequency model monitoring unit (not shown) in high frequency power module 21, this high-frequency model unit is used for also completing patrolling and examining storage battery 22 simultaneously to monitoring high frequency power module 21.
Particularly, AC input cell 1 adopts three-phase alternating current in the present embodiment, and the ac input circuit mean allocation has also been introduced ground wire simultaneously in AC input cell in three-phase bus.Input 211 and three-phase bus wherein a bus are connected, and input 211 also joins with ground wire.Be provided with circuit breaker between input 211 and three-phase bus and ground wire, circuit breaker adopts high-breaking miniature breaker, for example C66N type circuit breaker in the present embodiment.
Furthermore, this DC power system also comprises interchange monitoring unit 3, exchange monitoring unit 3 and be electrically connected with AC input cell 1, exchange output current and output voltage that monitoring unit 3 is used for the monitoring AC input cell, and surpass the warning value alarm at output current and output voltage.
Furthermore, this DC power system also is provided with lightning protection unit 5, and lightning protection unit 5 joins with three-phase bus and ground wire simultaneously, and lightning protection unit 5 comprises lightning rod and ground network, at 30 meters high lightning rods of periphery design, underground generally according to standard laying grid ground network.Traditional lightning protection grounding network adopts zinc-coated flat steel sheet, uses now copper covered steel or pure copper material.Earth resistance requires to reach 0.5 Europe once.
The utility model is the type of limiting AC input unit 1 not, and the alternating current that AC input cell 1 flows to high frequency power module 21 can also be single-phase alternating current.Similarly, at the utility model, the rated voltage of storage battery and the output voltage of this DC power system are not restricted yet.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection range of the utility model claims.
Claims (7)
1. DC power system that is used for 110KV transformer station, comprise AC input cell (1) and a plurality of high frequency power module (21), described high frequency power module (21) is electrically connected with storage battery (22), described high frequency power module (21) comprises input (211) and output (212), the input (211) of described high frequency power module (21) is connected with described AC input cell (1), described a plurality of high frequency power module is divided into first group of high frequency power module and second group of high frequency power module, the output of described the first high frequency power module (211) is connected with described the first bus (61), the output of described second group of high frequency power module (212) is connected with described the second bus (62), described the first bus (61) is provided with circuit breaker (7) with described the second bus (62), described high frequency power module (21) is used for receiving alternating current and the output DC that described AC input cell (1) transmits, described high frequency power module (21) also is used for described storage battery (22) is charged, described high frequency power module (21) receives electric current and the output DC that described storage battery (22) discharges when described AC input cell (1) is cut off the power supply,
It is characterized in that, described high frequency power module (21) also comprises the sharing control unit, the sharing control unit of described first group of high frequency power module is connected by the first current equalizer (41), the sharing control unit of described second group of high frequency power module is connected by the second current equalizer (42), be provided with bus connection switch (8) between described the first current equalizer (41) and described the second current equalizer (42), described circuit breaker (7) is connected with described mother (8) switch gearing.
2. the DC power system for 110KV transformer station according to claim 1, is characterized in that, described DC power system also comprises interchange monitoring unit (3), and described interchange monitoring unit (3) is used for monitoring described AC input cell (1).
3. the DC power system for 110KV transformer station according to claim 2, is characterized in that, described DC power system also comprises the high-frequency model monitoring unit, and described high-frequency model monitoring unit is used for monitoring described high frequency power module (21).
4. the DC power system for 110KV transformer station according to claim 3, is characterized in that, described DC power system also comprises lightning protection unit (5), and described lightning protection unit (5) is connected with described AC input cell (1).
5. the DC power system for 110KV transformer station according to claim 1, is characterized in that, the rated voltage of described storage battery (22) is 12V.
6. the DC power system for 110KV transformer station according to claim 1, is characterized in that, described direct current is 220V.
7. the described DC power system for 110KV transformer station of according to claim 1-4 any one, is characterized in that, the alternating current that described AC input cell (1) is carried is single-phase or three-phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205756721U CN202978379U (en) | 2012-11-05 | 2012-11-05 | Direct current power supply system applied to 110KV substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205756721U CN202978379U (en) | 2012-11-05 | 2012-11-05 | Direct current power supply system applied to 110KV substation |
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| Publication Number | Publication Date |
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| CN202978379U true CN202978379U (en) | 2013-06-05 |
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| CN2012205756721U Expired - Lifetime CN202978379U (en) | 2012-11-05 | 2012-11-05 | Direct current power supply system applied to 110KV substation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538948A (en) * | 2014-12-26 | 2015-04-22 | 中达电通股份有限公司 | High-voltage direct-current power supply system and power supply control method thereof |
| CN104810894A (en) * | 2015-05-08 | 2015-07-29 | 山东鲁能智能技术有限公司 | Split type direct-current charging piles for electric automobiles, system and method |
| CN107846075A (en) * | 2017-12-13 | 2018-03-27 | 国网上海市电力公司 | A kind of modularized distribution type batteries in parallel connection straight-flow system |
| CN111371170A (en) * | 2020-02-17 | 2020-07-03 | 深圳供电局有限公司 | Direct current power supply |
| CN112787394A (en) * | 2020-11-28 | 2021-05-11 | 国网河南省电力公司经济技术研究院 | Transformer substation direct current bus type distributed parallel direct current power supply system with prefabricated cabin |
-
2012
- 2012-11-05 CN CN2012205756721U patent/CN202978379U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538948A (en) * | 2014-12-26 | 2015-04-22 | 中达电通股份有限公司 | High-voltage direct-current power supply system and power supply control method thereof |
| CN104538948B (en) * | 2014-12-26 | 2019-03-26 | 中达电通股份有限公司 | High voltage direct current power supply system and its method for controlling power supply |
| CN104810894A (en) * | 2015-05-08 | 2015-07-29 | 山东鲁能智能技术有限公司 | Split type direct-current charging piles for electric automobiles, system and method |
| CN104810894B (en) * | 2015-05-08 | 2017-04-05 | 山东鲁能智能技术有限公司 | A kind of split type direct-current charging post of electric automobile, system and method |
| CN107846075A (en) * | 2017-12-13 | 2018-03-27 | 国网上海市电力公司 | A kind of modularized distribution type batteries in parallel connection straight-flow system |
| CN111371170A (en) * | 2020-02-17 | 2020-07-03 | 深圳供电局有限公司 | Direct current power supply |
| CN112787394A (en) * | 2020-11-28 | 2021-05-11 | 国网河南省电力公司经济技术研究院 | Transformer substation direct current bus type distributed parallel direct current power supply system with prefabricated cabin |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |