CN104993387A - Grounding method for power distribution devices in power distribution station - Google Patents
Grounding method for power distribution devices in power distribution station Download PDFInfo
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- CN104993387A CN104993387A CN201510303454.0A CN201510303454A CN104993387A CN 104993387 A CN104993387 A CN 104993387A CN 201510303454 A CN201510303454 A CN 201510303454A CN 104993387 A CN104993387 A CN 104993387A
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Abstract
The invention relates to a grounding method for power distribution devices in a power distribution station. According to the grounding method for power distribution devices in a power distribution station, power distribution devices in a power distribution station are grounded reasonably. The power distribution devices in the power distribution station are grounded in a reasonable manner and have good grounding performance. The running stability of the power distribution devices in the power distribution station and the safety of operation and maintenance personnel during maintenance are improved. In addition, through the technical scheme, the power distribution devices in the power distribution station are grounded in order, grounding of the power distribution devices is conducted in an orderly manner, and missing grounding of the power distribution devices and safety accidents caused thereby are avoided.
Description
Technical field
The present invention relates to the earthing method for distribution component in power distribution station.
Background technology
In much large-scale power plant or transformer station, all need transformer to access in single-phase short circuit ground network, but because the earth resistance in power plant or transformer station is all greater than 0 Ω, if the short circuit current in transformer just can produce a high voltage through resistance, far point voltage in ground network then may keep zero potential, and earth point in power station so just can be caused between getting access to grid to have one from high to low inhomogeneities current potential feature.It can thus be appreciated that, when carrying out single-phase short circuit ground connection in transformer station, ground network there will be certain voltage difference, if may go out to produce the insulator of larger current or damaged line when this voltage difference is larger, thus produce strong interference, also may produce to whole section of cable or terminal box burning property time serious and destroy.
In prior art, in power distribution station, the earthing method of distribution component is unreasonable, easily causes security incident.
Summary of the invention
Earthing method for distribution component in power distribution station provided by the invention, to be intended to overcome in prior art the earthing method of distribution component in power distribution station unreasonable, easily to cause the deficiency of security incident.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: for the earthing method of distribution component in power distribution station, comprise the following steps:
A, laying ground network;
B, the safety ground of secondary device rack enclosure: secondary device rack enclosure is electrically connected with ground network by earthing member;
Whether c, the resistance measured between secondary device rack enclosure and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of earthing member when being greater than 0.5 Ω, make the resistance between secondary device rack enclosure and ground network be less than or equal to 0.5 Ω, then, enter next step;
D, secondary device rack enclosure logic ground: the earth terminal being positioned at rack is electrically connected with ground network by rack grounding copper bar;
Whether the resistance between e, measuring earth terminal and ground network is less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of rack grounding copper bar when being greater than 0.5 Ω, make the resistance between earth terminal and ground network be less than or equal to 0.5 Ω, then, enter next step;
F, analog quantity loop ground connection: independent loops all in power distribution station adopts single-point grounding mode to be electrically connected with ground network by earth cable, and the earthing position of single-point grounding is positioned at indoor;
Whether g, the resistance measured between all independent loops and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of earth cable when being greater than 0.5 Ω, make the resistance between all independent loops and ground network be less than or equal to 0.5 Ω, then, enter next step;
H, secondary cable shielding layer earthing: first, arrange conductive layer in secondary cable shielding layer, then, is electrically connected by conductive layer respectively at the two ends of secondary cable with ground network by shielding layer grounding body;
Whether i, the resistance measured between conductive layer and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of shielding layer grounding body when being greater than 0.5 Ω, make the resistance between conductive layer and ground network be less than or equal to 0.5 Ω, then, enter next step;
J, transformer station's inner terminal case ground connection: terminal box is electrically connected with ground network by the terminal box grounding copper bar adopting cross-sectional area to be not less than 300 square millimeters;
Whether k, resistance between measurement terminal case and ground network are less than or equal to 0.5 Ω, progressive next step when being less than or equal to 0.5 Ω; Increase the conductive area of terminal box grounding copper bar when being greater than 0.5 Ω, make the resistance between terminal box and ground network be less than or equal to 0.5 Ω, then, enter next step;
The main ground connection of l, master-control room: the main grounding copper bar of master-control room adopting cross-sectional area to be not less than 100 square millimeters joins end to end and forms main copper bar looped network, then is electrically connected with ground network by main copper bar looped network;
Whether m, the resistance measured between master-control room and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of master-control room main grounding copper bar when being greater than 0.5 Ω, make the resistance between master-control room and ground network be less than or equal to 0.5 Ω, then, enter next step;
The secondary ground connection of n, master-control room: the secondary grounding copper bar of master-control room adopting cross-sectional area to be not less than 30 square millimeters joins end to end and forms secondary copper bar looped network, then is electrically connected with ground network by secondary copper bar looped network;
O, when disconnecting the main ground connection of master-control room, whether the resistance measured between master-control room and ground network is less than or equal to 0.5 Ω, progressive next step when being less than or equal to 0.5 Ω; Increase the conductive area of master-control room secondary grounding copper bar when being greater than 0.5 Ω, make the resistance between master-control room and ground network be less than or equal to 0.5 Ω, then, enter next step
P, the main ground connection of connection master-control room.
As preferably, described earthing member is arranged between secondary device rack enclosure and ground network by welding manner, and described earthing member is channel-section steel or band steel.Welding manner has good electric conductivity, relative to other connected mode, adopts welding manner to carry out connection and makes earthing member have better electric conductivity.
As preferably, described secondary cable shielding layer is woven formed by steel band, copper mesh, copper strips, polyvinyl chloride.The secondary cable shielding layer of this structure can absorb space radiation, while raising cable security performance, extends the useful life of cable.
Compared with prior art, the present invention passes through technique scheme, by reasonable for the distribution component in power distribution station ground connection, the earthing method of joining interior device in power distribution station rationally and have good ground connection performance, improves the security performance that stability when distribution component is run in power distribution station and fortune inspection personnel overhaul luck inspection personnel; In addition, by technical scheme of the present invention, the distribution component in order in wildcard power station carries out ground connection, carries out in order during distribution component ground connection, avoids distribution component to reveal ground connection and causes security incident.
Embodiment
For the earthing method of distribution component in power distribution station, comprise the following steps:
A, laying ground network;
B, the safety ground of secondary device rack enclosure: secondary device rack enclosure is electrically connected with ground network by earthing member; Described earthing member is arranged between secondary device rack enclosure and ground network by welding manner, and described earthing member is channel-section steel or band steel;
Whether c, the resistance measured between secondary device rack enclosure and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of earthing member when being greater than 0.5 Ω, make the resistance between secondary device rack enclosure and ground network be less than or equal to 0.5 Ω, then, enter next step;
D, secondary device rack enclosure logic ground: the earth terminal being positioned at rack is electrically connected with ground network by rack grounding copper bar;
Whether the resistance between e, measuring earth terminal and ground network is less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of rack grounding copper bar when being greater than 0.5 Ω, make the resistance between earth terminal and ground network be less than or equal to 0.5 Ω, then, enter next step;
F, analog quantity loop ground connection: independent loops all in power distribution station adopts single-point grounding mode to be electrically connected with ground network by earth cable, and the earthing position of single-point grounding is positioned at indoor;
Whether g, the resistance measured between all independent loops and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of earth cable when being greater than 0.5 Ω, make the resistance between all independent loops and ground network be less than or equal to 0.5 Ω, then, enter next step;
H, secondary cable shielding layer earthing: first, arrange conductive layer in secondary cable shielding layer, then, is electrically connected by conductive layer respectively at the two ends of secondary cable with ground network by shielding layer grounding body; Described secondary cable shielding layer is woven formed by steel band, copper mesh, copper strips, polyvinyl chloride, and to absorb the space radiation in transformer station, the weaving manner of secondary cable shielding layer is the common weaving manner of screen in prior art;
Whether i, the resistance measured between conductive layer and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of shielding layer grounding body when being greater than 0.5 Ω, make the resistance between conductive layer and ground network be less than or equal to 0.5 Ω, then, enter next step;
J, transformer station's inner terminal case ground connection: terminal box is electrically connected with ground network by the terminal box grounding copper bar adopting cross-sectional area to be not less than 300 square millimeters;
Whether k, resistance between measurement terminal case and ground network are less than or equal to 0.5 Ω, progressive next step when being less than or equal to 0.5 Ω; Increase the conductive area of terminal box grounding copper bar when being greater than 0.5 Ω, make the resistance between terminal box and ground network be less than or equal to 0.5 Ω, then, enter next step;
The main ground connection of l, master-control room: the main grounding copper bar of master-control room adopting cross-sectional area to be not less than 100 square millimeters joins end to end and forms main copper bar looped network, then is electrically connected with ground network by main copper bar looped network;
Whether m, the resistance measured between master-control room and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of master-control room main grounding copper bar when being greater than 0.5 Ω, make the resistance between master-control room and ground network be less than or equal to 0.5 Ω, then, enter next step;
The secondary ground connection of n, master-control room: the secondary grounding copper bar of master-control room adopting cross-sectional area to be not less than 30 square millimeters joins end to end and forms secondary copper bar looped network, then is electrically connected with ground network by secondary copper bar looped network;
O, when disconnecting the main ground connection of master-control room, whether the resistance measured between master-control room and ground network is less than or equal to 0.5 Ω, progressive next step when being less than or equal to 0.5 Ω; Increase the conductive area of master-control room secondary grounding copper bar when being greater than 0.5 Ω, make the resistance between master-control room and ground network be less than or equal to 0.5 Ω, then, enter next step
P, the main ground connection of connection master-control room.
On be only the preferred embodiment of the present invention, being intended to embody outstanding technique effect of the present invention and advantage, is not the restriction to technical scheme of the present invention.Those skilled in the art will appreciate that all amendments made based on the technology of the present invention content, change or substitute technology feature, all should be covered by the technology category of claims of the present invention opinion.
Claims (3)
1. for the earthing method of distribution component in power distribution station, it is characterized in that, comprise the following steps:
A, laying ground network;
B, the safety ground of secondary device rack enclosure: secondary device rack enclosure is electrically connected with ground network by earthing member;
Whether c, the resistance measured between secondary device rack enclosure and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of earthing member when being greater than 0.5 Ω, make the resistance between secondary device rack enclosure and ground network be less than or equal to 0.5 Ω, then, enter next step;
D, secondary device rack enclosure logic ground: the earth terminal being positioned at rack is electrically connected with ground network by rack grounding copper bar;
Whether the resistance between e, measuring earth terminal and ground network is less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of rack grounding copper bar when being greater than 0.5 Ω, make the resistance between earth terminal and ground network be less than or equal to 0.5 Ω, then, enter next step;
F, analog quantity loop ground connection: independent loops all in power distribution station adopts single-point grounding mode to be electrically connected with ground network by earth cable, and the earthing position of single-point grounding is positioned at indoor;
Whether g, the resistance measured between all independent loops and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of earth cable when being greater than 0.5 Ω, make the resistance between all independent loops and ground network be less than or equal to 0.5 Ω, then, enter next step;
H, secondary cable shielding layer earthing: first, arrange conductive layer in secondary cable shielding layer, then, is electrically connected by conductive layer respectively at the two ends of secondary cable with ground network by shielding layer grounding body;
Whether i, the resistance measured between conductive layer and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of shielding layer grounding body when being greater than 0.5 Ω, make the resistance between conductive layer and ground network be less than or equal to 0.5 Ω, then, enter next step;
J, transformer station's inner terminal case ground connection: terminal box is electrically connected with ground network by the terminal box grounding copper bar adopting cross-sectional area to be not less than 300 square millimeters;
Whether k, resistance between measurement terminal case and ground network are less than or equal to 0.5 Ω, progressive next step when being less than or equal to 0.5 Ω; Increase the conductive area of terminal box grounding copper bar when being greater than 0.5 Ω, make the resistance between terminal box and ground network be less than or equal to 0.5 Ω, then, enter next step;
The main ground connection of l, master-control room: the main grounding copper bar of master-control room adopting cross-sectional area to be not less than 100 square millimeters joins end to end and forms main copper bar looped network, then is electrically connected with ground network by main copper bar looped network;
Whether m, the resistance measured between master-control room and ground network are less than or equal to 0.5 Ω, and improve when being less than or equal to 0.5 Ω next step; Increase the conductive area of master-control room main grounding copper bar when being greater than 0.5 Ω, make the resistance between master-control room and ground network be less than or equal to 0.5 Ω, then, enter next step;
The secondary ground connection of n, master-control room: the secondary grounding copper bar of master-control room adopting cross-sectional area to be not less than 30 square millimeters joins end to end and forms secondary copper bar looped network, then is electrically connected with ground network by secondary copper bar looped network;
O, when disconnecting the main ground connection of master-control room, whether the resistance measured between master-control room and ground network is less than or equal to 0.5 Ω, progressive next step when being less than or equal to 0.5 Ω; Increase the conductive area of master-control room secondary grounding copper bar when being greater than 0.5 Ω, make the resistance between master-control room and ground network be less than or equal to 0.5 Ω, then, enter next step
P, the main ground connection of connection master-control room.
2. the earthing method for distribution component in power distribution station according to claim 1, is characterized in that: described earthing member is arranged between secondary device rack enclosure and ground network by welding manner, and described earthing member is channel-section steel or band steel.
3. the earthing method for distribution component in power distribution station according to claim 1, is characterized in that: described secondary cable shielding layer is woven formed by steel band, copper mesh, copper strips, polyvinyl chloride.
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| CN201510303454.0A CN104993387A (en) | 2015-06-05 | 2015-06-05 | Grounding method for power distribution devices in power distribution station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922219A (en) * | 2021-10-29 | 2022-01-11 | 上海市安装工程集团有限公司 | Method for preventing adjacent high-voltage switch cabinets from mistakenly tripping |
Citations (1)
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| CN103166141A (en) * | 2011-12-14 | 2013-06-19 | 河南省电力勘测设计院 | Grounding grid of urban full-indoor transformer substation of 220kV |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166141A (en) * | 2011-12-14 | 2013-06-19 | 河南省电力勘测设计院 | Grounding grid of urban full-indoor transformer substation of 220kV |
Non-Patent Citations (1)
| Title |
|---|
| 朱前卫，孙力，蒋曙霞: "电力系统二次设备接地技术探讨", 《湖州师范学院学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922219A (en) * | 2021-10-29 | 2022-01-11 | 上海市安装工程集团有限公司 | Method for preventing adjacent high-voltage switch cabinets from mistakenly tripping |
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Application publication date: 20151021 |