CN203589374U - A TN-S system which is used for a steel structure workshop cable and which can be without a protective ground wire - Google Patents
A TN-S system which is used for a steel structure workshop cable and which can be without a protective ground wire Download PDFInfo
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- CN203589374U CN203589374U CN201320393199.XU CN201320393199U CN203589374U CN 203589374 U CN203589374 U CN 203589374U CN 201320393199 U CN201320393199 U CN 201320393199U CN 203589374 U CN203589374 U CN 203589374U
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Abstract
Provided is a TN-S system which is used for a steel structure workshop cable and which can be without a protective ground wire. According to the TN-S system which is used for the steel structure workshop cable and which can be without the protective ground wire, equipotential and auxiliary equipotential connection are carried out on portions such as uncharged metal structures and devices, material components, and natural and artificial grounding electrodes or form a spatial equipotential grounding body comprising the whole workshop. Special attention is given to the reliable connection and the long-term validity of a grounding grid, and effects of TN-S system equipotential and auxiliary equipotential connection and repeated grounding are enabled to be prominent, so that protection core wires of a power supply cable are enabled to be reduced, and requirements for saving investments and raising the reliability and safety of the TN-S system are satisfied.
Description
Technical field
The utility model relate to a kind of for steel-structure factory building cable can be not with the TN-S system of protection ground wire; utilize the available uncharged metallic conductor of steel-structure factory building to carry out equipotential and the connection of auxiliary equipotential; in whole factory building not live metal partly connect and become reliable, permanently effective ground protection body; guaranteed the Electrical Safety environment in steel-structure factory building; especially can guarantee safe in the situation that; service cable can reduce by a protection ground wire core, relatively saves investment.
Background technology
In steel-structure factory building, metal part is many; from security standpoint, consider; metal parts itself is necessary reliable ground; aspect safety ground protection; utilize these metals partly reliably to weld and ground connection; just can form one and there is the cancellated reliable ground body in equipotential huge space, safe and reliable power utilization environment can not only be provided, and can reduce the safeguard protection grounding measures of other side and reduce investment outlay.But in reality is implemented, although these resource ground connection in steel-structure factory building are not usually accomplished reliable ground connection, have to rely on protective earthing line in feed cable to guarantee the security reliability of TN-S system, the actual waste that causes resource.
Adopt zinc-coated flat steel sheet to be connected with this mode of copper tip, of long duration, can be because of reasons such as oxidations, easily produce loose contact, it is a major reason that affects equipotential coupling reliability, electrical code regulation, steel and copper contact-making surface need to adopt wards off tin processing, but manually ward off tin, processes difficult and difficult quality guarantee.The connection of steel construction metal part is with bolts, and the time has been grown and also easily produced loose contact.
TN-S electric power system is the system with the neutral-point solid ground of privacy protection zero line, and zero line is divided into protection zero line and working zero line, and working zero line is the neutral line, i.e. N line; Protection zero line is protection ground wire, i.e. PE line, and both all draw respectively from transformer neutral point, and working zero line insulation against ground is laid, and protection zero line needs to carry out iterative earthing.In general TN-S system, must there be a protection ground wire in each loop, if single-phase loop is L1 or L2 or L3, N, PE line totally three lines; Three-phase loop is L1, L2, L3, N (N line is not essential as required), PE tetra-or five lines; Power supply loop is generally L1, L2, L3, N, five lines of PE.Corresponding cable is three heart yearns, quad, five heart yearns, and when current supply circuit is more, especially five-core cable consumption is more.In factory building, generally think little of the iterative earthing of protective earthing line and local and whole equipotential and connect, earth connection is very long, the phenomenon that impedance is relatively large and easy generation disconnects; The phenomenon that simultaneously also exist two, three, quad substitutes three, four, five heart yearns, usually lacks corresponding PE protective wire, has in fact reduced TN-S system safety protection effect.
There is again the situation of the long easy open circuit of working zero line in TN-S electric power system simultaneously; in general steel-structure factory building, three-phase load is more; single-phase 220V load is less and capacity is less; operating current on working zero line is also little; except part loop; when most of loop does not arrange earth leakage protective, working zero line also can be done iterative earthing, but is generally subject to the restriction of equipotential connecting mode not do iterative earthing.
Summary of the invention
The utility model is mainly to consider steel-structure factory building, reinforcing bar in column foundation and ring beam, zinc-coated flat steel sheet connecting belt, the indoor and outdoor work that increasing is beaten and lightning protection extremely can form one and have the netted earth electrode in equipotential space, comprise again apparatus body and basis, pipeline and support, cable testing bridge and support, the auxiliary equipotential body in part that the metal partss such as crane runway form, if that implements is relatively good, this net vertical body space electrical grounding body forming can meet the protection against electric shock requirement in factory building completely, connection and the iterative earthing of having emphasized equipotential body that it is outstanding, possessed the protection against electric shock measure more safer than TN-S system, make it can substitute the protective earthing line in TN-S system cable, it is PE line, reached safe and practical, the object reducing costs.
The utility model solves the technical scheme that its technical problem adopts:
A kind of for steel-structure factory building cable can be not with the TN-S system of protection ground wire, comprise power distribution cabinet 1, headstock 2, service cable 3, iterative earthing device 4, equipotential connected body 5, the power supply input of headstock 2 causes an output loop of power distribution cabinet 1 by service cable 3, it is characterized in that: the association that described iterative earthing device 1 and described equipotential connected body 5 have formed reliable connection has replaced the protective earthing line PE in described service cable 3, described service cable 3 adopts and comprises one～tri-phase line that loop is required and two～four-core service cable 3 of a working zero line N, described working zero line N in described service cable 3 is except power distribution cabinet 1 place described is with described iterative earthing device 4 is connected with equipotential connected body 5, described working zero line N is also connected with described equipotential connected body 5 at the earth leakage protective device mains side that earth leakage protective loop is not set or leakage protection loop has been set, also be to be provided with on the equipotential connected body 5 in steel-structure factory building equipotential connection connecting terminal 6-1～6-n,
Described iterative earthing device 1 and described equipotential connected body 5 form, and the reliable association that is connected is the netted combination in space that described iterative earthing device 1 and described equipotential connected body 5 Multipoint Uniforms are welded to connect formation;
Described iterative earthing device 1 comprises natural grounding device and artificial earthing's device, described natural grounding device be by the column foundation of described steel-structure factory building, the main muscle overlapped points that even spot welding connection and described bar-mat reinforcement are carried out in the crosspoint of bar-mat reinforcement at least 30%～50% in lower ring, equipment and pipe network basis all adopt the metal mesh structure in whole steel-structure factory building that is distributed in that the underground circular that is welded to connect is connected;
Described artificial earthing's device comprises vertical grounding electrode and horizontal grounding line, described vertical grounding electrode adopts Zinc-coated angle steel 5 meters of outer ring settings outside described steel-structure factory building axis, described horizontal grounding line adopts zinc-coated flat steel sheet and described vertical grounding electrode, the described interior reinforcing bar host muscle of column foundation, described equipotential connected body 5 to be welded to connect, and described artificial earthing's utmost point also comprises the working earthing device of distribution system, grounding-for-lightning device, information system earthing device;
Described equipotential connected body 5 is to adopt described zinc-coated flat steel sheet ground in the steel construction of described steel-structure factory building, cable testing bridge and steel bracket, metallic conduit and support, bridge crane track, steel protection tube, hardware shell and described steel-structure factory building to be carried out to the netted or ring-type welding equipotential in space in above or underground visible space between normal uncharged metal parts to connect.
Described equipotential connected body 5 also comprises that the netted described equipotential to adopting described zinc-coated flat steel sheet to carry out maximum 30 * 40m between described steel-structure factory building column foundation connects, the permanent plant that also comprises described steel-structure factory building is done the auxiliary equipotential connection of M shape, the described equipotential that also comprises the current supply circuit ground connection backbone from power distribution cabinet described in described steel-structure factory building to described power consumption equipment connects, described equipotential connects all employing welding, but adopt the bolt type of attachment of copper facing band steel or copper cable or copper busbar to carry out equipotential connection to the permanent plant that does not allow to be welded to connect.
In described steel-structure factory building, within the scope of appropriate location and certain intervals, being provided with material is the described equipotential connection connecting terminal 6-1～6-n of copper facing band steel; described copper facing band steel equipotential connection connecting terminal 6-1～6-n and described equipotential connected body 5 are welded to connect, and described copper facing band steel equipotential connection connecting terminal 6-1～6-n is connected to galvanized bolt with ground protection line PE in described steel-structure factory building and is connected.
The beneficial effects of the utility model are, the equipotential of having strengthened TN-S system connects, the iterative earthing of auxiliary equipotential connection and protective earthing line PE and working zero line N, increase less earthing material and earth terminal material and formed the netted ground connection in space and the equipotential association that described iterative earthing device 1 in whole factory building and described equipotential connected body 5 Multipoint Uniforms are connected to form, the interior protective earthing line of the service cable 3 PE heart yearn that has replaced said function, improved the level of the electrocution-proof protection of system, do not reduce the functional requirement of TN-S system, corresponding more input of having saved on cable.
Accompanying drawing explanation
Fig. 1 is that the utility model iterative earthing and equipotential connected body are connected block diagram with TN-S system.
In Fig. 1: 1: power distribution cabinet, 2: headstock, 3: service cable, 4: iterative earthing device, 5: equipotential connected body, 6-1～6-n: equipotential connection connecting terminal, 7: circuit breaker, 8: earth leakage protective device, 9: the first power consumption equipments, 10: the second power consumption equipments.
Embodiment
First utilize reinforcing bar in workshop steel column foundation and ring beam, equipment and pipe network reinforcement foundation are made the described natural grounding device of TN-S system, in basis, steel bar welding is connected into net, the main muscle overlapped points that even spot welding connection and described bar-mat reinforcement are carried out at least 30%～50% crosspoint all adopts and is welded to connect, at least draw two main muscle and carry out described equipotential connection, in factory building, in steel column and basis, reinforcing bar reliably welds, between steel-column foundation, utilize reinforcement foundation and zinc-coated flat steel sheet, workshop steel structure, crane runway, cable testing bridge steel supports to be done longitudinally to connect, between steel structure connection bolt, with zinc-coated flat steel sheet, doing Ω shape connects, every maximum 40m, utilize-40 * 4 zinc-coated flat steel sheets and workshop steel structure to do laterally to connect to steel-column foundation, steel-structure factory building is connected into the netted ground network of described equipotential that maximum grid is 30 * 40m, to doing described auxiliary equipotential between power consumption equipment, connect simultaneously, be that M type equipotential connects.For reliability and the long-term effectiveness that guarantees that ground network connects, except described power distribution cabinet 1, described headstock 2, power consumption equipment 9 10 or other in adopt copper facing band steel terminal or stub cable crimping, between the association that described iterative earthing device 1 and described equipotential connected body 5 form, all adopt and be welded to connect, connecting line adopts the guaranteed zinc-coated flat steel sheet of quality, be embedded in below ground, base concrete and the welding portion exposing, weld connection position adopts anti-corrosion measure, in construction, strict acceptance of concealed work and detection afterwards, guarantee construction quality; The earth resistance of described natural grounding device can not meet while requiring and makes described artificial earthing's utmost point and the working earthing device, grounding-for-lightning device, the information system earthing device that utilize distribution system in outdoor increasing.
It should be noted that the utility model is mainly for hard-wired power consumption equipment in factory building, for the mobile power consumption equipment in factory building, because carrying out being fixedly connected of PE protective wire, in order to facilitate the ground protection PE copper cash of described mobile power consumption equipment reliably to access, in factory building appropriate location with within the scope of certain intervals and near mobile device workplace, be provided with the copper facing band steel that many places are reliably connected described in equipotential binding post 6-1～6-n, described copper facing band steel and equipotential connected body 5 connected modes are welding, copper facing band steel is connected to galvanized bolt with external ground line and is connected, for mobile device easily from power supply or draw protection ground wire nearby, realize the object of safety utilization of electric power.
Reliable, effectively in order to ensure grounding system; not only in steel-structure factory building, formed the space equipotential body 5 of reliable welding; by service cable 3 being laid to the reliable weld connection of equipotential between the zinc-plated channel-section steel of described power distribution cabinet 1 ground connection on path, the ground connection zinc-coated flat steel sheet of cable ditch support, the support channel-section steel of cable testing bridge or ground connection zinc-coated flat steel sheet, heavy wall protection steel pipe and effectively anticorrosion, formed from introduce power supply to described power distribution cabinet 1 again to described power consumption equipment 9 or 10 or other the reliable netted connection of current supply circuit ground connection backbone.
Because single-phase 220V power consumption equipment in factory building is less, capacity is less, and the electric current in described working zero line N is very little, on the other hand, in steel-structure factory building, iterative earthing device 4 is evenly arranged relatively, formed a huge netted electrical grounding body 5, thereby part single-phase load is less, do not establish the described working zero line N in loop before earth leakage protective or earth leakage protective and carried out iterative earthing, by the described equipotential in factory building, connect like this, not only met the iterative earthing requirement of protective earthing line PE, also utilized and linked up reliable described equipotential body 5 the described working zero line N of part has been done to iterative earthing, as as described in there is no the loop of earth leakage protective device 8 as described in installation in headstock 2, the described working zero line N in the loop before described earth leakage protective device 8 carries out iterative earthing, improved the security reliability of TN-S system.
Reliable owing to having formed in steel-structure factory building, effective netted described equipotential connected body 5; thereby possessed and reduced in described service cable 3 from introducing power supply to the condition of the protective earthing line PE between fixing power consumption equipment; though earthing material consumption has increase; but because of total amount little; compare the described service cable 3 using with described protective earthing line PE; not only cost-saving; and can fundamentally meet the designing requirement of TN-S system protection against electric shock, reach and improved the security reliability of system.
Claims (4)
- One kind for steel-structure factory building cable can be not with the TN-S system of protection ground wire, comprise power distribution cabinet (1), headstock (2), service cable (3), iterative earthing device (4), equipotential connected body (5), the power supply input of headstock (2) causes an output loop of power distribution cabinet (1) by service cable (3), it is characterized in that: the association that described iterative earthing device (1) and described equipotential connected body (5) have formed reliable connection has replaced the protective earthing line PE in described service cable (3), described service cable (3) adopts and to comprise one～tri-phase line that loop is required and two～four-core service cable (3) of a working zero line N, described working zero line N in described service cable (3) is except the power distribution cabinet described (1) is located to be connected with equipotential connected body (5) with described iterative earthing device (4), described working zero line N is also connected with described equipotential connected body (5) at the earth leakage protective device mains side that earth leakage protective loop is not set or leakage protection loop has been set, also be to be provided with equipotential connection connecting terminal (6-1～6-n) on the equipotential connected body (5) in steel-structure factory building.
- According to claim 1 a kind of can be not with the TN-S system of protection ground wire, it is characterized in that: described iterative earthing device (1) and described equipotential connected body (5) form, and the reliable association that is connected is the netted combination in space that described iterative earthing device (1) and described equipotential connected body (5) Multipoint Uniform are welded to connect formation.
- According to claim 2 a kind of can be not with the TN-S system of protection ground wire, it is characterized in that: described iterative earthing device (1) comprises natural grounding device and artificial earthing's device, described natural grounding device be by the column foundation of described steel-structure factory building, the main muscle overlapped points that even spot welding connection and described bar-mat reinforcement are carried out in the crosspoint of bar-mat reinforcement at least 30%～50% in lower ring, equipment and pipe network basis all adopt the metal mesh structure in whole steel-structure factory building that is distributed in that the underground circular that is welded to connect is connected;Described artificial earthing's device comprises vertical grounding electrode and horizontal grounding line, described vertical grounding electrode adopts Zinc-coated angle steel 5 meters of outer ring settings outside described steel-structure factory building axis, described horizontal grounding line adopts zinc-coated flat steel sheet and described vertical grounding electrode, the described interior reinforcing bar host muscle of column foundation, described equipotential connected body (5) to be welded to connect, and described artificial earthing's utmost point also comprises the working earthing device of distribution system, grounding-for-lightning device, information system earthing device;Described equipotential connected body (5) is to adopt described zinc-coated flat steel sheet ground in the steel construction of described steel-structure factory building, cable testing bridge and steel bracket, metallic conduit and support, bridge crane track, steel protection tube, hardware shell and described steel-structure factory building to be carried out to the netted or ring-type welding equipotential in space in above or underground visible space between normal uncharged metal parts to connect;Described equipotential connected body (5) also comprises that the netted described equipotential to adopting described zinc-coated flat steel sheet to carry out maximum 30 * 40m between described steel-structure factory building column foundation connects, the permanent plant that also comprises described steel-structure factory building is done the auxiliary equipotential connection of M shape, the described equipotential that also comprises the current supply circuit ground connection backbone from power distribution cabinet described in described steel-structure factory building to described power consumption equipment connects, described equipotential connects all employing welding, but adopt the bolt type of attachment of copper facing band steel or copper cable or copper busbar to carry out equipotential connection to the permanent plant that does not allow to be welded to connect.
- According to claim 3 a kind of can be not with the TN-S system of protection ground wire; it is characterized in that: in described steel-structure factory building, within the scope of appropriate location and certain intervals, being provided with material is the described equipotential connection connecting terminal (6-1～6-n) of copper facing band steel; described copper facing band steel equipotential connection connecting terminal (6-1～6-n) is welded to connect with described equipotential connected body (5), and described copper facing band steel equipotential connection connecting terminal (6-1～6-n) is connected to galvanized bolt with ground protection line PE in described steel-structure factory building and is connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320393199.XU CN203589374U (en) | 2013-07-01 | 2013-07-01 | A TN-S system which is used for a steel structure workshop cable and which can be without a protective ground wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320393199.XU CN203589374U (en) | 2013-07-01 | 2013-07-01 | A TN-S system which is used for a steel structure workshop cable and which can be without a protective ground wire |
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| CN203589374U true CN203589374U (en) | 2014-05-07 |
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| CN201320393199.XU Expired - Fee Related CN203589374U (en) | 2013-07-01 | 2013-07-01 | A TN-S system which is used for a steel structure workshop cable and which can be without a protective ground wire |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109346929A (en) * | 2018-11-26 | 2019-02-15 | 国家电网有限公司 | A secondary general grounding plate structure |
| CN109830917A (en) * | 2019-03-15 | 2019-05-31 | 中国三冶集团有限公司 | A kind of device and method setting up temporary cable |
-
2013
- 2013-07-01 CN CN201320393199.XU patent/CN203589374U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109346929A (en) * | 2018-11-26 | 2019-02-15 | 国家电网有限公司 | A secondary general grounding plate structure |
| CN109830917A (en) * | 2019-03-15 | 2019-05-31 | 中国三冶集团有限公司 | A kind of device and method setting up temporary cable |
| CN109830917B (en) * | 2019-03-15 | 2024-08-30 | 中国三冶集团有限公司 | Device and method for erecting temporary cable |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20160701 |
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| CF01 | Termination of patent right due to non-payment of annual fee |