CN102832553A - Transformer substation earthing system - Google Patents

Transformer substation earthing system Download PDF

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Publication number
CN102832553A
CN102832553A CN2012102957761A CN201210295776A CN102832553A CN 102832553 A CN102832553 A CN 102832553A CN 2012102957761 A CN2012102957761 A CN 2012102957761A CN 201210295776 A CN201210295776 A CN 201210295776A CN 102832553 A CN102832553 A CN 102832553A
Authority
CN
China
Prior art keywords
earthing
ground
weak current
building
earth electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012102957761A
Other languages
Chinese (zh)
Inventor
丘国良
田志峰
高强
陈杰
邱续东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Zhongguang Electronic Technology Co Ltd
Shenzhen Power Supply Bureau Co Ltd
Original Assignee
Guangzhou Zhongguang Electronic Technology Co Ltd
Shenzhen Power Supply Bureau Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Zhongguang Electronic Technology Co Ltd, Shenzhen Power Supply Bureau Co Ltd filed Critical Guangzhou Zhongguang Electronic Technology Co Ltd
Priority to CN2012102957761A priority Critical patent/CN102832553A/en
Publication of CN102832553A publication Critical patent/CN102832553A/en
Pending legal-status Critical Current

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Abstract

The invention provides an earthing system for solving the problem of ground potential counterattack or electromagnetic crosstalk generated by a main earthing body possibly existing a transformer substation to a communication earthing loop. The earthing system comprises a main earthing body, a direct lightning stroke lightning conductor, a comprehensive building lightning protection body, an in-building earthing line net arranged in a comprehensive building, a heavy current installation earthing loop and a weak current installation earthing loop, especially, the earthing system also comprises a weak current earthing leading bus, a weak current earthing body and an earthing connecting body, wherein the weak current installation earthing loop is not connected with the in-building earthing line net; the weak current installation earthing loop, the weak current earthing leaking bus and the weak current earthing body are sequentially connected; one end of the earthing connecting body is connected with the main earthing body, the other end of the earthing connecting body is connected with the weak current earthing body through an equipotential connector; the minimum distance between the weak current earthing body and the main earthing body is not less than 15m; and the weak current earthing leading bus is a high-voltage insulation line. The invention can ensure normal operation of a communication device in the transformer substation.

Description

The substation grounding system
Technical field
The invention belongs to the lightning protection field, relate in particular to a kind of grounding system that transformer station's weak current equipment suffers earth potential counterattack and electromagnetic crosstalk problem that solves.
Background technology
Comprise in the existing substation grounding system: earth connection road network in main ground connection (net) body, direct lightning strike lightning rod, the lightning-arrest body of complex building building and the building.Wherein, the earth connection road network is with the ground loop conducting that comprises heavy current installation ground loop and weak current equipment ground loop in the building.The heavy current installation ground loop refers to the ground loop in the room that is arranged at main configuration such as relay bungalow, GIS chamber heavy current installation.The weak current equipment ground loop refers to the ground loop in the room that is arranged at main configuration such as communication machine room, battery room weak current equipment.
Like Fig. 1, shown in Figure 2, existing weak current equipment ground loop 6 ' is to be communicated on the ground connection busbar of same floor with heavy current installation ground loop 5 ', then passes through earth connection road network 4 ' in the building of floor again and with main earth electrode 1 ' conducting.What adopt between weak current equipment ground loop and heavy current installation ground loop and the main earth electrode is the single-point grounding of connecting, i.e. S type earthing mode.
Yet such grounding system; Operation to equipment in the communications equipment room is not enough with protection; Reason is: when the protection of heavy current installation and control system ground short circuit, big electric current are flowed through in the building earth connection road network, and the earth potential of the local potential missionary society of earth connection road network interference weak current equipment in the building; When lightning current gets into main earth electrode through the direct lightning strike lightning rod, then might form the earth potential counterattack, cause the interference or the damage of weak current equipment.
So, need improve existing substation grounding system implementation, to guarantee the normal operation of weak current equipment.
Summary of the invention
The purpose of this invention is to provide a kind of main earth electrode that possibly occur in the transformer station produces earth potential counterattack or electromagnetic crosstalk problem to the communication ground loop grounding system that solves; The normal operation of support equipment and operating personnel's safety, and equipment to the full extent.
For achieving the above object, the present invention takes following technical scheme:
The substation grounding system comprises: main earth electrode, direct lightning strike lightning rod, complex building are built lightning-arrest body, are arranged on earth connection road network in the building in the complex building, and heavy current installation ground loop and weak current equipment ground loop; The heavy current installation ground loop in the building earth connection road network and with main earth electrode conducting; Especially, comprise that also light current ground connection draws Down Highway, light current earth electrode and ground connection connector; The weak current equipment ground loop is not attached to earth connection road network in the building; Weak current equipment ground loop, light current ground connection are drawn Down Highway, the conducting successively of light current earth electrode; One end of ground connection connector and main earth electrode conducting, the other end of ground connection connector is connected with the light current earth electrode through the equipotential connector; Minimum range between said light current earth electrode and the main earth electrode is not less than 15 meters; It is the High-Voltage Insulation line that said light current ground connection is drawn Down Highway.
Operation principle of the present invention is following: lightning protection, working earthing, protective earthing are isolated, and each ground path that makes different in kind can be shared low-resistance and be separate, is independent of each other.The weak current equipment ground loop is separated the earth connection road network in the building, and transformer station adopts S+M type wire structures to reduce the pressure drop of circuit between weak current equipment ground loop and the main earth electrode on the whole, reduces the counterattack probability of main earth electrode to weak current equipment.
The present invention can effectively reduce the probability of earth potential counterattack, thereby ensures the normal operation of communication equipment in the transformer station.
Description of drawings
Fig. 1 is the ground junction composition of certain floor in the complex building of existing transformer station;
Fig. 2 is the grounding system schematic diagram of existing transformer station;
Fig. 3 is the ground junction composition of certain floor in the complex building of embodiment;
Fig. 4 is the grounding system schematic diagram of embodiment.
Description of reference numerals: 1-master's earth electrode; 2-direct lightning strike lightning rod; The lightning-arrest body of 3-complex building building; Earth connection road network in the 4-building; 5-heavy current installation ground loop; 6-weak current equipment ground loop; 7-light current ground connection is drawn Down Highway; 8-light current earth electrode; 9-ground connection connector; 10-equipotential connector; 1 '-main earth electrode; Earth connection road network in 4 '-building; 5 '-heavy current installation ground loop; 6 '-weak current equipment ground loop.
Embodiment
Below in conjunction with accompanying drawing and embodiment content of the present invention is described further.
Like Fig. 3, shown in Figure 4; The grounding system of present embodiment comprises: main earth electrode 1, direct lightning strike lightning rod 2, the lightning-arrest body 3 of complex building building, be arranged on earth connection road network 4, heavy current installation ground loop 5, weak current equipment ground loop 6 in the building in the complex building, and light current ground connection is drawn Down Highway 7, light current earth electrode 8 and ground connection connector 9.
Wherein, the weak current equipment ground loop 6 of present embodiment refers to the ground loop that is arranged in communications equipment room, the first communication power supply chamber, first battery room, second communication power supply room and second battery room.
As shown in Figure 4, the weak current equipment ground loop 6 of grounding system of the present invention is not connected to on the earth connection road network 4 in the building that connected of heavy current installation ground loop 5 of layer, but draws Down Highway 7 and light current earth electrode 8 and ground connection through light current ground connection.The existing relatively substation grounding system of light current earth electrode 8 is the earth electrode of extra increase, and an end of itself and ground connection connector 9 links together through equipotential connector 10.The other end of ground connection connector 9 and 1 conducting of main earth electrode.
At ordinary times, the weak current equipment in the complex building draws Down Highway 7 through weak current equipment ground loop 6, light current ground connection and light current earth electrode 8 is realized protective earthing and working earthing; Heavy current installation in the complex building is realized protective earthing and working earthing through earth connection road network 4 and main earth electrode 1 in heavy current installation ground loop 5, the building, and light current ground connection and forceful electric power ground connection are isolated mutually, and weak current equipment can not receive the electromagnetic crosstalk of heavy current installation.When thunder and lightning taking place hit the lightning-arrest body 3 of direct lightning strike lightning rod 2 or complex building building, main earth electrode 1 will be born the earial drainage effect of the overwhelming majority and lightning current leaked into underground this moment, also can play the earial drainage effect with the ground connection connector 9 of main earth electrode 1 conducting.Equipotential connector 10 will make light current earth electrode 8 and 9 conductings of ground connection connector during owing to be struck by lightning; Thereby make light current earth electrode 8 equate with current potential between the main earth electrode 1; Therefore will can not produce earth potential counterattack phenomenon this moment, weak current equipment will be played a protective role.
In the present embodiment, light current ground connection is drawn Down Highway 7 and is the High-Voltage Insulation line, but not bare wire or naked rib can be reduced in probability that produces induced potential on this section conductor and the value that reduces institute's induced potential like this.
Metallic conductor as shown in Figure 4, that ground connection connector 9 buries for artificial soil can be the monomer of strip, also can be the grid body of strip.When setting up light current earth electrode 8, should guarantee light current earth electrode 8 go into ground on schedule and the minimum range D of ground between on schedule that go into of main earth electrode 1 be not less than 15 meters.
In addition; Light current earth electrode 8 go into ground on schedule and direct lightning strike lightning rod 2 go into the distance of ground between on schedule; And light current earth electrode 8 go into ground on schedule and the lightning-arrest body 3 of complex building building go into the distance of ground between on schedule; All should be not less than 15 meters, with guarantee light current earth electrode 8 respond to the current potential of generation can be not too high.
This specification lists be merely preferred embodiments of the present invention, all equivalent technologies conversion of under operation principle of the present invention and thinking, being done all are regarded as protection scope of the present invention.

Claims (4)

1. substation grounding system comprises: main earth electrode, direct lightning strike lightning rod, complex building are built lightning-arrest body, are arranged on earth connection road network in the building in the complex building, and heavy current installation ground loop and weak current equipment ground loop; The heavy current installation ground loop in the building earth connection road network and with main earth electrode conducting; It is characterized in that: comprise that also light current ground connection draws Down Highway, light current earth electrode and ground connection connector; The weak current equipment ground loop is not attached to earth connection road network in the building; Weak current equipment ground loop, light current ground connection are drawn Down Highway, the conducting successively of light current earth electrode; One end of ground connection connector and main earth electrode conducting, the other end of ground connection connector is connected with the light current earth electrode through the equipotential connector; Minimum range between said light current earth electrode and the main earth electrode is not less than 15 meters.
2. substation grounding as claimed in claim 1 system, it is characterized in that: it is the High-Voltage Insulation line that said light current ground connection is drawn Down Highway.
3. substation grounding as claimed in claim 1 system, it is characterized in that: ground connection connector (9) is the monomer of strip, or the grid body of strip.
4. substation grounding as claimed in claim 1 system; It is characterized in that: light current earth electrode (8) go into ground on schedule and direct lightning strike lightning rod (2) go into the distance of ground between on schedule; And light current earth electrode (8) go into ground on schedule and the lightning-arrest body (3) of complex building building go into the distance of ground between on schedule, all be not less than 15 meters.
CN2012102957761A 2012-08-20 2012-08-20 Transformer substation earthing system Pending CN102832553A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012102957761A CN102832553A (en) 2012-08-20 2012-08-20 Transformer substation earthing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012102957761A CN102832553A (en) 2012-08-20 2012-08-20 Transformer substation earthing system

Publications (1)

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CN102832553A true CN102832553A (en) 2012-12-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104466761A (en) * 2014-10-21 2015-03-25 深圳供电局有限公司 Transformer substation temporary wiring anti-misoperation locking system, detection method and computer key
CN113341206A (en) * 2021-06-21 2021-09-03 广东电网有限责任公司 Method and device for determining steps of GIS double-bus parallel current

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101478119A (en) * 2009-01-24 2009-07-08 国网电力科学研究院 Earthing process for transforming plant protecting device shielding chamber
CN202127103U (en) * 2011-03-04 2012-01-25 中国铁路通信信号上海工程集团有限公司 Lightning prevention grounding system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101478119A (en) * 2009-01-24 2009-07-08 国网电力科学研究院 Earthing process for transforming plant protecting device shielding chamber
CN202127103U (en) * 2011-03-04 2012-01-25 中国铁路通信信号上海工程集团有限公司 Lightning prevention grounding system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
何艳娇: "变电站弱电设备防雷保护的研究", 《万方数据企业知识服务平台》, 17 March 2008 (2008-03-17), pages 51 - 54 *
陈国新: ""大型建筑中强弱电系统的接地问题"", 《电气时代》, no. 2, 31 December 2001 (2001-12-31), pages 48 *
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104466761A (en) * 2014-10-21 2015-03-25 深圳供电局有限公司 Transformer substation temporary wiring anti-misoperation locking system, detection method and computer key
CN113341206A (en) * 2021-06-21 2021-09-03 广东电网有限责任公司 Method and device for determining steps of GIS double-bus parallel current
CN113341206B (en) * 2021-06-21 2022-03-04 广东电网有限责任公司 Method and device for determining steps of GIS double-bus parallel current

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Application publication date: 20121219