CN105826848A - Power station grounding grid - Google Patents
Power station grounding grid Download PDFInfo
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- CN105826848A CN105826848A CN201610262720.4A CN201610262720A CN105826848A CN 105826848 A CN105826848 A CN 105826848A CN 201610262720 A CN201610262720 A CN 201610262720A CN 105826848 A CN105826848 A CN 105826848A
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- connecting terminal
- grounded screen
- electric connecting
- electric
- electrically connects
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B5/00—Non-enclosed substations; Substations with enclosed and non-enclosed equipment
- H02B5/01—Earthing arrangements, e.g. earthing rods
Abstract
The invention discloses a power station grounding grid and belongs to the electric field. The power station grounding grid includes a grid-side grounding grid and a power station-side grounding grid; the grid-side grounding grid is electrically connected with the grounding point of the neutral point of a step-up main transformer; the grid-side grounding grid is electrically connected with the grounding point of first equipment; the first equipment includes equipment directly connected with a power grid; the power station-side grounding grid is electrically connected with the grounding point of second equipment; the second equipment includes equipment of which the working power source is supplied by a power station; and no electrical connection exists between the grid-side grounding grid and the power station-side grounding grid. With the power station grounding grid adopted, harm to the step-up main transformer of the power station caused by ground current can be reduced, and the security of the power grid and the power station can be improved.
Description
Technical field
It relates to electric field, particularly to a kind of electric station grounded screen.
Background technology
Earth-current generally exists in electrical network, and such as, boost main transformer neutral point out-of-balance current, geomagnetic induction current and the earth-current produced in the case of other, and earth-current all exists the biggest potential safety hazard to electric station and electric station staff.Therefore, in order to reduce earth-current, electric station and electric station staff are produced potential safety hazard, need earth-current is carried out earial drainage.
Realize earth-current earial drainage in the following way at present: each electric station includes a grounded screen, this grounded screen has conductive capability, the electric current accessing this grounded screen can be injected the earth, by the earth point by the neutral point of the boosting main transformer of this electric station, the earth point of the equipment that the earth point of electric station station equipment and grid side are directly connected to and the earth point of miscellaneous equipment are connected in this grounded screen so that each earth-current completes earial drainage by this grounded screen.
Inventor, during realizing the disclosure, finds that correlation technique at least has following defects that
Owing to the composition material of the grounded screen of each electric station is not quite similar, the earthing effect causing the grounded screen of each electric station is the most different, and then causes earth-current more to carry out earial drainage by the grounded screen of the preferable electric station of earthing effect.Now, earth-current on electrical network can flow through the main transformer winding of the preferable electric station of this earthing effect by overhead transmission line, make main transformer D.C. magnetic biasing, increase noise, longtime running affects Transformer Winding insulation, time serious, cause dielectric breakdown accident, and then cause the preferable electric station of this earthing effect to there is bigger potential safety hazard.
Summary of the invention
In order to solve problem present in correlation technique, the disclosure provides a kind of electric station grounded screen.Described electric station grounded screen includes: grid side grounded screen and plant side grounded screen；
Described grid side grounded screen electrically connects with the earth point of the neutral point of boosting main transformer, and described grid side grounded screen electrically connects with the earth point of the first equipment, and described first equipment includes the equipment directly electrically connected with electrical network；
Described plant side grounded screen electrically connects with the earth point of the second equipment, and described second equipment includes the equipment that working power is provided by electric station；
Without electrically connecting between described grid side grounded screen with described plant side grounded screen.
Optionally, described grid side grounded screen is spaced apart more than or equal to non-interference distance with described plant side grounded screen, and described non-interference distance does not produce the distance of electromagnetic interference for described grid side grounded screen and described plant side grounded screen.
Optionally, described non-interference distance is 20 meters.
Optionally, described plant side grounded screen electrically connects with the earth point of voltage transformer secondary side, and described plant side grounded screen electrically connects with the earth point of voltage transformer secondary cable shield.
Optionally, described plant side grounded screen electrically connects with the earth point of Current Transformer Secondary side, and described plant side grounded screen electrically connects with the earth point of Current Transformer Secondary cable shield.
Optionally, described electric station grounded screen includes the first bus-bar, described first bus-bar includes first electric connecting terminal and at least one second electric connecting terminal, described first electric connecting terminal is connected with at least one second electric connecting terminal described, each electric connecting terminal at least one second electric connecting terminal described is in parallel, and each described electric connecting terminal is for connecting an earth point；
Described grid side grounded screen is with described first electric connecting terminal electricity in succession, the earth point of described neutral point electrically connects with an electric connecting terminal at least one second electric connecting terminal described, and the earth point of each described first equipment electrically connects with an electric connecting terminal at least one second electric connecting terminal described.
Optionally, described electric station grounded screen includes the second bus-bar, described second bus-bar includes the 3rd electric connecting terminal and at least one the 4th electric connecting terminal, described 3rd electric connecting terminal is connected with at least one the 4th electric connecting terminal described, each electric connecting terminal at least one the 4th electric connecting terminal described is in parallel, and each described electric connecting terminal is for connecting an earth point；
Described plant side grounded screen electrically connects with described 3rd electric connecting terminal, and the earth point of each described second equipment electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described；
Described plant side grounded screen electrically connects with described 3rd electric connecting terminal, and the earth point of described voltage transformer secondary side electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described；
The earth point of described voltage transformer secondary cable shield electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described.
Optionally, described electric station grounded screen includes the second bus-bar, described second bus-bar includes the 3rd electric connecting terminal and at least one the 4th electric connecting terminal, described 3rd electric connecting terminal is connected with at least one the 4th electric connecting terminal described, each electric connecting terminal at least one the 4th electric connecting terminal described is in parallel, and each described electric connecting terminal is for connecting an earth point；
Described plant side grounded screen electrically connects with described 3rd electric connecting terminal, and the earth point of each described second equipment electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described；
Described plant side grounded screen electrically connects with described 3rd electric connecting terminal, and the earth point of described Current Transformer Secondary side electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described；
The earth point of described Current Transformer Secondary cable shield electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described.
Optionally, described neutral point includes the Y type neutral point of the boosting main transformer directly electrically connected with electrical network, and described grid side grounded screen electrically connects with the earth point of described Y type neutral point.
Embodiment of the disclosure that the technical scheme of offer can include following beneficial effect:
The electric station grounded screen provided in disclosure embodiment includes grid side grounded screen and plant side grounded screen, and therebetween without electrical connection.Therefore, when laying this grid side grounded screen, can select to lay the position of this grid side grounded screen easily, thus can preferably this grid side grounded screen be laid in the environment same or like with other grid side grounded screen on electrical network, and then make this grid side grounded screen have same or like resistance to earth with other each grid side grounded screen in electrical network, and then the flowing of earth-current on minimizing electrical network, thus reduce and flow through booster transformer main transformer winding and the earth-current of neutral point, and then alleviate the earth-current harm to electric station boosting main transformer, reach the effect of the safety improving electrical network and electric station.
It should be appreciated that it is only exemplary that above general description and details hereinafter describe, the disclosure can not be limited.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meets and embodiment of the disclosure, and in description together for explaining the principle of the disclosure.
Figure 1A is the block diagram according to a kind of electric station grounded screen shown in an exemplary embodiment；
Figure 1B is the schematic diagram according to a kind of electric station grounded screen shown in another exemplary embodiment；
Fig. 2 is the schematic diagram according to a kind of voltage transformer secondary side summation current transformer secondary side sending and receiving power station side joint earth mat shown in another exemplary embodiment；
Fig. 3 is the schematic diagram according to a kind of voltage transformer secondary cable shield summation current transformer secondary cable shielding layer sending and receiving power station side joint earth mat shown in another exemplary embodiment；
Fig. 4 is and according to the schematic diagram of a kind of grounded screen including bus-bar shown in an exemplary embodiment.
Detailed description of the invention
Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.When explained below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.Embodiment described in following exemplary embodiment does not represent all embodiments consistent with the disclosure.On the contrary, they only with describe in detail in appended claims, the disclosure some in terms of the example of consistent apparatus and method.
Figure 1A is the schematic diagram according to a kind of electric station grounded screen G shown in exemplary partial embodiment, and as shown in Figure 1A, this electric station grounded screen G can include grid side grounded screen G1 and plant side grounded screen G2.
This electric station grounded screen G can be used for earth-current present in the equipment that earial drainage electric station includes, so this electric station grounded screen G electrically connects with the equipment that there may be earth-current in power station plant, with the earth-current on these equipment of earial drainage.
The mode or the equipment that produce earth-current comprise the steps that the equipment that the neutral point out-of-balance current that may be present of boosting main transformer directly electrically connects with electrical network is likely to be due to other reason such as insulation breakdown, electromagnetic induction and causes electric current present in these equipment, and the equipment that working power is provided by electric station is possibly also owing to other reason such as insulation breakdown, electromagnetic induction causes the electric current that there is also in these equipment.
Further, see Figure 1B, it Figure 1B is the schematic diagram of a kind of electric station grounded screen, this electric station grounded screen can include following equipment: boost main transformer 1, the neutral point 2 of boosting main transformer 1, the first equipment 3, second equipment 4, electromotor 5 (being also the one of the second equipment 4), this first equipment 3 can include the equipment directly electrically connected with electrical network, and this second equipment 4 includes the equipment that working power is provided by electric station.
It addition, W, Y, Z are that this boosting main transformer 1 is to the three-phase bus after the boost in voltage in electric station.This boosting main transformer 1 is delta connection (can also be for star connection) with the three-phase line of electromotor 5 outlet side, and with grid side without electrically connecting, the neutral point 2 of boosting main transformer 1 is wye connection.
This grid side grounded screen G1 that this electric station grounded screen G includes and the equipment that this plant side grounded screen G2 includes with electric station are connected by following connected mode:
This grid side grounded screen G1 electrically connects with the earth point of this neutral point 2, and this grid side grounded screen G1 also earth point with this first equipment 3 electrically connects.
This plant side grounded screen G2 electrically connects with the earth point of this second equipment 4.
Without electrically connecting between this grid side grounded screen G1 with this plant side grounded screen G2.
In the present embodiment, as shown in figure 1 a or figure 1b, this electric station grounded screen G can include this grid side grounded screen G1 and two grounded screens of this plant side grounded screen G2.So, G1 and G2 divides out, and grid side grounded screen G1 can be made to be laid in as required, and it suitably lays place.Such as, optional have with other grid side grounded screen on electrical network same or like lay environment, make the resistance to earth of each grid side grounded screen on electrical network same or like, and then the flowing of earth-current on minimizing electrical network, thus decrease main transformer winding and the earth-current of neutral point 2 flowing through boosting main transformer 1, and then improve the safety of electrical network and electric station.
Optionally, this neutral point 2 also includes the delta-type neutral point directly electrically connected with electrical network.
Optionally, in order to make not produce electromagnetic interference between this grid side grounded screen G1 and this plant side grounded screen G2, between this grid side grounded screen G1 and this plant side grounded screen G2 spaced apart more than or equal to non-interference distance, this non-interference distance does not produce the distance of electromagnetic interference for being this grid side grounded screen G1 and this plant side grounded screen G2.
Additionally, this non-interference distance can be determined according to the practical situation of this electric station grounded screen G, such as, when grid side grounded screen G1 of this electric station and this plant side grounded screen G2 lay area bigger time, this non-interference distance can be defined as a bigger distance, such as, be defined as 40 meters, when grid side grounded screen G1 of this electric station and this plant side grounded screen G2 lay area less time, this non-interference distance can be defined as a less distance, such as, be defined as 10 meters or 20 meters.Here it is not specifically limited.
Additionally, (the such as Nuclear Power Station when this electric station is in coastal, Nuclear Power Station is in coastal mostly), owing to sea water has certain electric conductivity, so when laying the grounded screen of electric station, grid side grounded screen G1 of this electric station and the distance on seashore are more than or equal to non-electric-connecting distance, to avoid this grid side grounded screen G1 to realize electrically connecting by sea water with this plant side grounded screen G2, this non-electric-connecting distance refers to the distance that this grid side grounded screen G1 can not be electrically connected by sea water realization with this plant side grounded screen G2.
It addition, for voltage transformer summation current transformer, grounded screen can be electrically connected in the following way:
For voltage transformer, its side joint is in high-pressure system, if the insulation damages of first and second side of this voltage transformer that is in operation, primary side high pressure will be scurried into secondary side, and not only damage secondary side equipment and also threaten the safety of staff.Therefore, the secondary side of voltage transformer needs one point earth.Electrically connecting to not exist with grid side grounded screen G1, see Fig. 2, this plant side grounded screen G2 also earth point with voltage transformer secondary side 6 electrically connects.It addition, in order to protect voltage transformer further, improving the safety of electric station, see Fig. 3, this plant side grounded screen G2 also earth point with voltage transformer secondary cable shield 8 electrically connects.
For current transformer, its side joint enters big electric current, and secondary side accesses small area analysis, in order to prevent when first and second side is broken down by high-voltage because of insulation breakdown, the big electric current of its primary side scurries into secondary side, thus damages secondary side equipment, and threatens the safety of staff.Therefore, the secondary side of current transformer needs one point earth.Electrically connect to not exist with grid side grounded screen G1, see Fig. 2, this plant side grounded screen G2 also earth point with voltage transformer secondary side 7 electrically connects, in order to improve the safety of secondary side further, seeing Fig. 3, this plant side grounded screen G2 also earth point with Current Transformer Secondary cable shield 9 electrically connects.
Additionally, owing to this voltage transformer primary side and this current transformer primary side are directly connected with electrical network, and electrical network directly electrically connects with the neutral point 2 of this boosting main transformer 1, and the earth point of the neutral point 2 of this boosting main transformer 1 electrically connects this grid side grounded screen G1, so this voltage transformer primary side and this current transformer primary side electrically connect with grid side grounded screen G1 indirectly, thus without again electrically connecting grounded screen.
Optionally, see Fig. 4, this electric station grounded screen G can also include the first bus-bar 10, this first bus-bar 10 includes one first electric connecting terminal 11 and at least one second electric connecting terminal 12, this the first electric connecting terminal 11 with this at least one second electric connecting terminal 12 connect, each electric connecting terminal in this at least one second electric connecting terminal 12 is in parallel, and this electric connecting terminal each is for connecting an earth point.
Additionally, referring still to Fig. 4, can realize this neutral point 2 by the following method and electrically connect with grid side grounded screen G1, and this first equipment 3 electrically connects with grid side grounded screen G1:
This grid side grounded screen G1 is with this first electric connecting terminal 11 electricity in succession, an electric connecting terminal at least one second electric connecting terminal 12 of the earth point and this of this neutral point 2 electrically connects, and an electric connecting terminal at least one second electric connecting terminal 12 of the earth point and this of this first equipment 3 each electrically connects.
Optionally, referring still to Fig. 4, this electric station grounded screen G also includes the second bus-bar 20, this second bus-bar 20 includes one the 3rd electric connecting terminal 21 and at least one the 4th electric connecting terminal 22,3rd electric connecting terminal 21 with this at least one the 4th electric connecting terminal 22 connect, each electric connecting terminal in this at least one the 4th electric connecting terminal 22 is in parallel, and this electric connecting terminal each is for connecting an earth point.
Additionally, referring still to Fig. 4, this second equipment 4 can be realized by the following method and electrically connects with this plant side grounded screen G2:
This plant side grounded screen G2 electrically connects with the 3rd electric connecting terminal 21, and an electric connecting terminal at least one the 4th electric connecting terminal 22 of the earth point and this of this second equipment 4 each electrically connects.
Additionally, referring still to Fig. 4, can realize this voltage transformer secondary side 6 by the following method and electrically connect with this plant side grounded screen G2, and this voltage transformer secondary cable shield 8 electrically connects with this plant side grounded screen G2:
This plant side grounded screen G2 electrically connects with the 3rd electric connecting terminal 21, and an electric connecting terminal at least one the 4th electric connecting terminal 22 of the earth point and this of this voltage transformer secondary side 6 electrically connects.An electric connecting terminal at least one the 4th electric connecting terminal 22 of the earth point and this of this voltage transformer secondary cable shield 8 electrically connects.
Additionally, referring still to Fig. 4, can realize this voltage transformer secondary side 7 by the following method and electrically connect with this plant side grounded screen G2, and this Current Transformer Secondary cable shield 9 electrically connects with this plant side grounded screen G2:
This plant side grounded screen G2 electrically connects with the 3rd electric connecting terminal 21, and an electric connecting terminal at least one the 4th electric connecting terminal 22 of the earth point and this of this voltage transformer secondary side 7 electrically connects.An electric connecting terminal at least one the 4th electric connecting terminal 22 of the earth point and this of this Current Transformer Secondary cable shield 9 electrically connects.
nullIt should be noted that，This electric station grounded screen G is also suitable for Nuclear Power Station，Existing Nuclear Power Station is substantially at coastal，And the resistance to earth of Nuclear Power Station grounded screen is much smaller than the resistance to earth of electric station, inland，Therefore，The earth-current of existing electrical network more passes through the grounded screen of Nuclear Power Station to sea earial drainage，So main transformer winding and neutral point on Nuclear Power Station causes the biggest impact，When the grounded screen using the disclosure to include，By the grounded screen of Nuclear Power Station，Lay as grid side grounded screen and plant side grounded screen，And the distance being laid in this grid side grounded screen with seashore is more than or equal to the inland of this non-electric-connecting distance，This Nuclear Power Station grid side grounded screen is made to have same or like resistance to earth with other grid side grounded screen on electrical network，Reduce earth-current on electrical network and flow through this Nuclear Power Station main transformer winding and neutral point，Improve the safety of electrical network and this Nuclear Power Station.
Additionally, for the electric station built up, the electric station grounded screen that this has built up will can be transformed according to electric station grounded screen G disclosed in the disclosure, will this Grounding Network Reconstruction be the grounded screen being made up of this grid side grounded screen G1 and this plant side grounded screen G2.
In sum, the electric station grounded screen provided in disclosure embodiment includes grid side grounded screen and plant side grounded screen, and therebetween without electrical connection.Therefore, when laying this grid side grounded screen, can select to lay the position of this grid side grounded screen easily, thus can preferably this grid side grounded screen be laid in the environment same or like with other grid side grounded screen on electrical network, and then make this grid side grounded screen have same or like resistance to earth with other each grid side grounded screen in electrical network, and then the flowing of earth-current on minimizing electrical network, thus reduce and flow through booster transformer main transformer winding and the earth-current of neutral point, and then alleviate the earth-current harm to electric station boosting main transformer, reach the effect of the safety improving electrical network and electric station.
Those skilled in the art, after considering description and putting into practice invention disclosed herein, will readily occur to other embodiment of the disclosure.The application is intended to any modification, purposes or the adaptations of the disclosure, and these modification, purposes or adaptations are followed the general principle of the disclosure and include the undocumented common knowledge in the art of the disclosure or conventional techniques means.Description and embodiments is considered only as exemplary, and the true scope of the disclosure and spirit are pointed out by claim below.
It should be appreciated that the disclosure is not limited to precision architecture described above and illustrated in the accompanying drawings, and various modifications and changes can carried out without departing from the scope.The scope of the present disclosure is only limited by appended claim.
Claims (9)
1. an electric station grounded screen, it is characterised in that described electric station grounded screen includes: grid side grounded screen and plant side grounded screen；
Described grid side grounded screen electrically connects with the earth point of the neutral point of boosting main transformer, and described grid side grounded screen electrically connects with the earth point of the first equipment, and described first equipment includes the equipment directly electrically connected with electrical network；
Described plant side grounded screen electrically connects with the earth point of the second equipment, and described second equipment includes the equipment that working power is provided by electric station；
Without electrically connecting between described grid side grounded screen with described plant side grounded screen.
Electric station the most according to claim 1 grounded screen, it is characterised in that
Described grid side grounded screen is spaced apart more than or equal to non-interference distance with described plant side grounded screen, and described non-interference distance does not produce the distance of electromagnetic interference for described grid side grounded screen and described plant side grounded screen.
Electric station the most according to claim 2 grounded screen, it is characterised in that described non-interference distance is 20 meters.
Electric station the most according to claim 1 grounded screen, it is characterised in that described plant side grounded screen electrically connects with the earth point of voltage transformer secondary side, described plant side grounded screen electrically connects with the earth point of voltage transformer secondary cable shield.
Electric station the most according to claim 1 grounded screen, it is characterised in that described plant side grounded screen electrically connects with the earth point of Current Transformer Secondary side, described plant side grounded screen electrically connects with the earth point of Current Transformer Secondary cable shield.
Electric station the most according to claim 1 grounded screen, it is characterized in that, described electric station grounded screen includes the first bus-bar, described first bus-bar includes first electric connecting terminal and at least one second electric connecting terminal, described first electric connecting terminal is connected with at least one second electric connecting terminal described, each electric connecting terminal at least one second electric connecting terminal described is in parallel, and each described electric connecting terminal is for connecting an earth point；
Described grid side grounded screen is with described first electric connecting terminal electricity in succession, the earth point of described neutral point electrically connects with an electric connecting terminal at least one second electric connecting terminal described, and the earth point of each described first equipment electrically connects with an electric connecting terminal at least one second electric connecting terminal described.
Electric station the most according to claim 4 grounded screen, it is characterized in that, described electric station grounded screen includes the second bus-bar, described second bus-bar includes the 3rd electric connecting terminal and at least one the 4th electric connecting terminal, described 3rd electric connecting terminal is connected with at least one the 4th electric connecting terminal described, each electric connecting terminal at least one the 4th electric connecting terminal described is in parallel, and each described electric connecting terminal is for connecting an earth point；
Described plant side grounded screen electrically connects with described 3rd electric connecting terminal, and the earth point of each described second equipment electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described；
Described plant side grounded screen electrically connects with described 3rd electric connecting terminal, and the earth point of described voltage transformer secondary side electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described；
The earth point of described voltage transformer secondary cable shield electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described.
Electric station the most according to claim 5 grounded screen, it is characterised in that
Described electric station grounded screen includes the second bus-bar, described second bus-bar includes the 3rd electric connecting terminal and at least one the 4th electric connecting terminal, described 3rd electric connecting terminal is connected with at least one the 4th electric connecting terminal described, each electric connecting terminal at least one the 4th electric connecting terminal described is in parallel, and each described electric connecting terminal is for connecting an earth point；
Described plant side grounded screen electrically connects with described 3rd electric connecting terminal, and the earth point of each described second equipment electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described；
Described plant side grounded screen electrically connects with described 3rd electric connecting terminal, and the earth point of described Current Transformer Secondary side electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described；
The earth point of described Current Transformer Secondary cable shield electrically connects with an electric connecting terminal at least one the 4th electric connecting terminal described.
9. according to the arbitrary described electric station grounded screen of claim 1 to 8, it is characterised in that described neutral point includes the Y type neutral point of the boosting main transformer directly electrically connected with electrical network, and described grid side grounded screen electrically connects with the earth point of described Y type neutral point.
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| CN201610262720.4A CN105826848B (en) | 2016-04-25 | 2016-04-25 | Power station grounded screen |
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| CN201610262720.4A CN105826848B (en) | 2016-04-25 | 2016-04-25 | Power station grounded screen |
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| CN110275078A (en) * | 2019-07-16 | 2019-09-24 | 国网江苏省电力有限公司电力科学研究院 | Substation secondary cable earth-return harasses differentiating method, system and storage medium |
| CN110850238A (en) * | 2019-12-18 | 2020-02-28 | 济南泰景电力技术有限公司 | Power cable leakage detection method and system |
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| Publication number | Publication date |
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| CN105826848B (en) | 2018-03-27 |
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