CN203589484U - Building power supply system - Google Patents
Building power supply system Download PDFInfo
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- CN203589484U CN203589484U CN201320676646.2U CN201320676646U CN203589484U CN 203589484 U CN203589484 U CN 203589484U CN 201320676646 U CN201320676646 U CN 201320676646U CN 203589484 U CN203589484 U CN 203589484U
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- breaker
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- transformer
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- 230000007935 neutral effect Effects 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a building power supply system. A neutral line N is led out from a low-voltage side of a transformer B, a grounding impedance Z and a grounding breaker QF4 which are connected in parallel are disposed between the neutral line N at the low-voltage side of the transformer B and a grounding point, a wire inlet end of a total breaker QF1 is connected with the low-voltage side of the transformer B, a wire inlet end of a load breaker QF2 is connected with a wire outlet end of the total breaker QF1, a wire outlet end of the load breaker QF2 and the neutral line N provide a three-phase four-wire system power supply for general electrical loads, a wire inlet end of an important-load breaker QF3 is connected with the wire outlet end of the total breaker QF1, a wire outlet end of the important-load breaker QF3 powers important electrical loads, and the important electrical loads are directly grounded through a protective grounding wire PE, and a grounding breaker QF4 is interlocked with the important-load breaker QF3. According to the building power supply system, a TN system and an IT system coexist in the same building and power the general loads and the important loads.
Description
Technical field
The utility model relates to a kind of architectural power supply system, relates in particular to a kind of TN system and the IT system electric power system that coexists in same building, belongs to power technology field.
Background technology
< < design of civil buildings standard > > (JGJ 16-2008) [1] 3.2.8 and 3.2.9 regulation: a stage load should be by two Power supplies, for the particular importance load in a stage load, should set up emergency power supply.The basic electric power system that architectural engineering power supply is used has three-phase three-wire system, three-phase four-wire system etc., and International Electrotechnical Commission (IEC) has made unified regulation to this, be called TT system, TN system and IT system." I " in IT electric power system (being isolated neutral system, hereinafter to be referred as IT system) represents that mains side does not have working earthing, or through high resistance grounding; Second letter " T " represents that load-side electric equipment carries out ground protection.Thereby IT system refers in power supply isolated neutral system, the exposed conductive part of all devices, all through protective wire PE separately direct ground connection respectively, be referred to as IT electric power system, and IT system is generally to three-phase three-wire system.IT electric power system is not while growing very much at power supply distance, have the advantages such as power supply reliability is high, fail safe is good, but because China's architectural electricity technical merit is relatively low, IT system does not obtain due application in the many occasions of China.
Electric device should require to adopt multi-form electric power system according to external environment of living in and power consumption equipment.In general, TN system mostly is in civil buildings and adopts, owing to should not allotting neutral conductor, to single-phase load, power supply causes its application limited to IT system, but for some important load, essential again, in order to guarantee maximum fail safe and flexibility, two different grounding systems can be applied in the power supply grid of same building.
Summary of the invention
The purpose of this utility model is to provide a kind of architectural power supply system, and TN system and IT system coexist and power to general load and important load in same building.
The purpose of this utility model is achieved by the following technical programs:
A kind of architectural power supply system, comprise transformer B, impedance ground Z, main breaker QF1, general load breaker QF2, important load circuit breaker Q F3, earthing breaker QF4, neutral line N, protective earthing line PE, described neutral line N is drawn by the low-pressure side of transformer B, between described transformer B low-pressure side neutral line N and earth point, be provided with impedance ground Z in parallel and earthing breaker QF4, the end of incoming cables of described main breaker QF1 is connected with transformer B low-pressure side, the end of incoming cables of described general load breaker QF2 is connected with the leading-out terminal of main breaker QF1, the leading-out terminal of general load breaker QF2 and neutral line N provide three-phase four-wire system power supply to general power load, the end of incoming cables of described important load circuit breaker Q F3 is connected with the leading-out terminal of main breaker QF1, the leading-out terminal of important load circuit breaker Q F3 is given important power load power supply, important power load is by the direct ground connection of protective earthing line PE, described earthing breaker QF4 and important load circuit breaker Q F3 interlocking.
Compared with prior art, the beneficial effects of the utility model are: supply power mode conversion rapidly, reliable operation, when not needing to use important load, important load breaker open operation, earthing breaker closes a floodgate, and impedance ground short circuit, electric power system provides the three-phase and four-line of neutral-point solid ground to add the power supply of protective wire for the electricity consumption of general load; When using important load electric power system, important load breaker closing, earthing breaker separating brake, electric power system neutral point is by impedance ground ground connection, and general power load and important power load share an electric power system.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of architectural power supply system, comprise transformer B, impedance ground Z, main breaker QF1, general load breaker QF2, important load circuit breaker Q F3, earthing breaker QF4, neutral line N, protective earthing line PE, described neutral line N is drawn by the low-pressure side of transformer B, between described transformer B low-pressure side neutral line N and earth point, be provided with impedance ground Z in parallel and earthing breaker QF4, the end of incoming cables of described main breaker QF1 is connected with transformer B low-pressure side, the end of incoming cables of described general load breaker QF2 is connected with the leading-out terminal of main breaker QF1, the leading-out terminal of general load breaker QF2 and neutral line N provide three-phase four-wire system power supply to general power load, the end of incoming cables of described important load circuit breaker Q F3 is connected with the leading-out terminal of main breaker QF1, the leading-out terminal of important load circuit breaker Q F3 is given important power load power supply, important power load is by the direct ground connection of protective earthing line PE, described earthing breaker QF4 and important load circuit breaker Q F3 interlocking.
When electric power system is powered to general power load (three stage loads) separately, earthing breaker closes a floodgate, and impedance ground, by short circuit, provides the TN-S system power supply of the neutral-point solid ground of standard to general power load.
When the compatible general power load of electric power system and important power load (stage load, two stage loads), important load breaker closing, earthing breaker separating brake, forms neutral point through the three-phase four-wire system IT system of large grounding through resistance.General power load and important power load share an architectural power supply system.
Important power load must be provided with insulation monitoring and warning device.Insulation monitoring and warning device is sent to control unit by acquisition module the current/voltage parameter of electric power system different stage, when there is for the first time single phase ground fault in system, insulated monitor is correctly reported to the police, to get rid of in time this earth fault, guarantees the safe and continuous of system power supply.
In concrete enforcement, transformer B selects oil immersed type.
In addition to the implementation, the utility model can also have other execution modes, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection range of the utility model requirement.
Claims (1)
1. an architectural power supply system, it is characterized in that, comprise transformer B, impedance ground Z, main breaker QF1, general load breaker QF2, important load circuit breaker Q F3, earthing breaker QF4, neutral line N, protective earthing line PE, described neutral line N is drawn by the low-pressure side of transformer B, between described transformer B low-pressure side neutral line N and earth point, be provided with impedance ground Z in parallel and earthing breaker QF4, the end of incoming cables of described main breaker QF1 is connected with transformer B low-pressure side, the end of incoming cables of described general load breaker QF2 is connected with the leading-out terminal of main breaker QF1, the leading-out terminal of general load breaker QF2 and neutral line N provide three-phase four-wire system power supply to general power load, the end of incoming cables of described important load circuit breaker Q F3 is connected with the leading-out terminal of main breaker QF1, the leading-out terminal of important load circuit breaker Q F3 is given important power load power supply, important power load is by the direct ground connection of protective earthing line PE, described earthing breaker QF4 and important load circuit breaker Q F3 interlocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676646.2U CN203589484U (en) | 2013-10-31 | 2013-10-31 | Building power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676646.2U CN203589484U (en) | 2013-10-31 | 2013-10-31 | Building power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203589484U true CN203589484U (en) | 2014-05-07 |
Family
ID=50587337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320676646.2U Expired - Lifetime CN203589484U (en) | 2013-10-31 | 2013-10-31 | Building power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203589484U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560402A (en) * | 2013-10-31 | 2014-02-05 | 江苏镇安电力设备有限公司 | Building power supply system |
| CN105742836A (en) * | 2016-03-16 | 2016-07-06 | 国网天津宝坻供电有限公司 | Grounding method of power distribution room |
-
2013
- 2013-10-31 CN CN201320676646.2U patent/CN203589484U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560402A (en) * | 2013-10-31 | 2014-02-05 | 江苏镇安电力设备有限公司 | Building power supply system |
| CN105742836A (en) * | 2016-03-16 | 2016-07-06 | 国网天津宝坻供电有限公司 | Grounding method of power distribution room |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140507 |
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| CX01 | Expiry of patent term |