CN104218550A - Grouped grounding system - Google Patents
Grouped grounding system Download PDFInfo
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- CN104218550A CN104218550A CN201310207188.2A CN201310207188A CN104218550A CN 104218550 A CN104218550 A CN 104218550A CN 201310207188 A CN201310207188 A CN 201310207188A CN 104218550 A CN104218550 A CN 104218550A
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Abstract
The invention belongs to the technical field of lightning protection, and provides a grouped grounding system. The system is provided with a lightning protection grounding bar, a working grounding bar and a protection grounding bar, a lightning absorption and isolation circuit is arranged among the lightning protection grounding bar, the working grounding bar and the protection grounding bar, so that the three types of grounding separation do not affect each other, ground potential is effectively prevented from being increased due to lightning current to make working grounding potential of an electric power or electrical communication device system and potential of a shell increased, and normal working of an electric power or electrical communication network and the safety of equipment maintenance personnel are ensured; meanwhile, the potentials of working grounding and protection grounding are not affected by the value of a grounding grid resistance, so that the grounding grid resistance is increased, large first construction investment and future maintenance investment are not required, the investment cost of construction of a grounding grid is saved, and the grounding grid is simple to build; and moreover, chemicals such as a resistance reducing agent is avoided, and the service life of the grounding gird is prolonged.
Description
Technical field
The invention belongs to anti-thunder technical field, particularly relate to a kind of grouping grounding system.
Background technology
Electric power, electronic communication equipment and grid grounding system, mainly comprise the working earthing of equipment or network, protective earthing, this three class of lightning protection.
Wherein, working earthing is divided into again DC operation ground connection and alternate current operation ground connection.DC operation ground connection: such as in a communications system, DC power supply adopts power supply based on-48V mostly, and namely this DC power supply adopts plus earth, and its plus earth just becomes the place of working of all communication systems, i.e. the Zero potential reference of communication network; Alternate current operation ground connection: in ac power supply system, in order to three-phase voltage balance has carried out transformer or generator neutral point ground connection, this neutral ground is alternate current operation ground connection.
Wherein, protective earthing refers in order to avoid AC and DC power supply line touches casing and constitutes a threat to equipment and the person, is formed short circuit current to cut off the electricity supply rapidly the ground connection in loop by chassics earth.
Wherein, lightning protection refers to the lightning-protection system of building, and the lightning-arrest device of the system such as AC/DC power-supply system, computer, network is by the ground connection of metal downlead, and during in order to realize thunderbolt, thunder energy is released fast and reduces surge voltage on circuit.
Prior art is generally adopt conbined earthing system, is connected to same ground network by working earthing line, protective earthing line and lightning protection line.In this kind of conbined earthing system, in order to reduce the impact of surge current on working earthing, protective earthing, the resistance of ground network need be reduced, such as, resistance reducing agent and earth rod series products can be adopted to build ground network.
But there is following problem in existing conbined earthing system: first; because working earthing line, protective earthing line and lightning protection line are linked together by metal object; influencing each other of three is large; especially, when lightning surge voltage enters union ground grid by lightning protection line, electronic equipment can be entered along protective earthing line, working earthing line in metal conduction mode.Secondly, existing engineering and the restriction of method of measurement, the ground network resistance of conbined earthing system is made not meet the requirements of low resistance, and in order to realize little earth resistance, the chemical products such as normal employing resistance reducing agent and earth rod improve soil degree of ionization to reach the object reducing ground network resistance, unavoidably there is couple corrosion in its metal structure, thus accelerates the corrosion rate of ground network, causes that the ground network life-span is low, maintenance cost is high, one-time investment is large.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of grouping grounding system; be intended to solve in existing conbined earthing system; working earthing line, influence each other between protective earthing line and lightning protection line large; and require ground network resistance enough little and cause one-time investment large; according to resistance reducing agent and earth rod, then cause the problem that the ground network life-span is low, maintenance cost is high.
The embodiment of the present invention is achieved in that a kind of grouping grounding system, and described system comprises:
Lightning protection is arranged, and described lightning protection row is provided with at least one lightning protection port;
Working earthing is arranged, and described working earthing row is provided with at least one working earthing port;
Protective earthing is arranged, and described protective earthing row is provided with at least one protective earthing port;
Thunder and lightning absorbs and buffer circuit, described thunder and lightning absorption is connected described lightning protection respectively with two inputs of buffer circuit and arranges, described thunder and lightning absorption is connected described working earthing with an output of buffer circuit and arranges, described thunder and lightning absorption is connected described protective earthing with another output of buffer circuit and arranges, described thunder and lightning absorbs arranges via described lightning protection the part lightning current poured in for storing with buffer circuit, and carry out frequency-selective filtering to arranging via described lightning protection the lightning current poured in, direct current is made and power current is without hindrance passes through to make lightning current to pass through.
The grouping grounding system that the embodiment of the present invention proposes arranges lightning protection row, working earthing row and protective earthing row respectively; and lightning protection row and working earthing row, protective earthing are provided with thunder and lightning and absorb and buffer circuit between arranging; thus make the ground connection of three types be separated and be independent of each other; effectively prevent cause because lightning current makes earth potential improve electric power, electronic communication equipment system working earthing and casing current potential improve, ensure that the normal work of electric power, electronic communication network and the safety of plant maintenance personnel.Simultaneously; the size of ground network resistance no longer affects the current potential of working earthing, protective earthing, thus ground network resistance is amplified, thus; do not need larger first time construction investment and the investment of maintenance from now on, save the input cost of ground mat construction, build simply.Meanwhile, avoid using the chemicals such as resistance reducing agent, improve the useful life of ground network.
Accompanying drawing explanation
Fig. 1 is the structure chart of the grouping grounding system that the embodiment of the present invention provides;
Fig. 2 is that the thunder and lightning that the embodiment of the present invention provides absorbs a kind of structure chart with buffer circuit;
Fig. 3 is that the thunder and lightning that the embodiment of the present invention provides absorbs the another kind of structure chart with buffer circuit;
Fig. 4 is in Fig. 2 and Fig. 3, the circuit diagram of thunder and lightning buffer circuit;
Fig. 5 is in Fig. 2 and Fig. 3, the circuit diagram of thunder and lightning absorbing circuit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
For existing conbined earthing system Problems existing; the embodiment of the present invention proposes a kind of grouping grounding system; this system comprises lightning protection row, working earthing row and protective earthing row, and lightning protection row and working earthing row, protective earthing are provided with thunder and lightning and absorb and buffer circuit between arranging.
Fig. 1 shows the structure of the grouping grounding system that the embodiment of the present invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention.
Specifically, the grouping grounding system that the embodiment of the present invention provides comprises: lightning protection row 1, and lightning protection row 1 is provided with at least one lightning protection port 5; Working earthing row 2, working earthing row 2 is provided with at least one working earthing port 6; Protective earthing row 3, protective earthing row 3 is provided with at least one protective earthing port 7; Thunder and lightning absorbs and buffer circuit 4; thunder and lightning absorption is connected lightning protection respectively with two inputs of buffer circuit 4 and arranges 1; thunder and lightning absorption is connected working earthing with an output of buffer circuit 4 and arranges 2; thunder and lightning absorption is connected protective earthing with another output of buffer circuit 4 and arranges 3; for storing the part lightning current poured in via lightning protection row 1; and carry out frequency-selective filtering to via the lightning current that pours in of lightning protection row 1, make direct current to make lightning current to pass through and power current is without hindrance passes through.
In one case, as shown in Figure 2, thunder and lightning absorbs and can comprise with buffer circuit 4: thunder and lightning absorbing circuit 41, the first end of thunder and lightning absorbing circuit 41 and the second end absorb and two inputs of buffer circuit 4 and be connected lightning protection and arrange 1 as thunder and lightning, for absorbing the surge energy of the part lightning current poured in via lightning protection row 1, to eliminate the crest energy arranging lightning current surge in the 1 part lightning current poured in via lightning protection; Thunder and lightning buffer circuit 42; the first end of thunder and lightning buffer circuit 42 is connected the 3rd end and the 4th end of thunder and lightning absorbing circuit 41 with the second end; 3rd end of thunder and lightning buffer circuit 42 absorbs and an output of buffer circuit 4 and be connected working earthing and arrange 2 as thunder and lightning; 4th end of thunder and lightning buffer circuit 42 absorbs and another output of buffer circuit 4 and be connected protective earthing and arrange 3 as thunder and lightning; electric current for exporting thunder and lightning absorbing circuit 41 carries out frequency-selective filtering, makes direct current and power current is without hindrance passes through to make lightning current to pass through.
In another case, as shown in Figure 3, thunder and lightning absorbs and can comprise with buffer circuit 4: thunder and lightning buffer circuit 42,3rd end of thunder and lightning buffer circuit 42 and the 4th end absorb and two inputs of buffer circuit 4 and be connected lightning protection and arrange 1 as thunder and lightning, for carrying out frequency-selective filtering to via the lightning current that pours in of lightning protection row 1, make direct current to make lightning current to pass through and power current is without hindrance passes through; Thunder and lightning absorbing circuit 41; 3rd end of thunder and lightning absorbing circuit 41 is connected first end and second end of thunder and lightning buffer circuit 42 with the 4th end; the first end of thunder and lightning absorbing circuit 41 absorbs and an output of buffer circuit 4 and be connected working earthing and arrange 2 as thunder and lightning; second end of thunder and lightning buffer circuit 42 absorbs and another output of buffer circuit 4 and be connected protective earthing and arrange 3 as thunder and lightning, for absorb thunder and lightning buffer circuit 42 output electric current in the surge energy of lightning current.
Fig. 4 shows in Fig. 2 and Fig. 3, the circuit of thunder and lightning buffer circuit 42.
Specifically, thunder and lightning buffer circuit 42 can comprise: differential mode inductance L2 and differential mode inductance L3.Wherein, one end A1 of differential mode inductance L2 is as the first end of thunder and lightning buffer circuit 42, and the other end B1 of differential mode inductance L2 is as the 3rd end of thunder and lightning buffer circuit 42; One end A2 of differential mode inductance L3 is as the second end of thunder and lightning buffer circuit 42, and the other end B2 of differential mode inductance L3 is as the 4th end of thunder and lightning buffer circuit 42.
In the embodiment of the present invention, thunder and lightning buffer circuit 42 specifically realizes the isolation to lightning current on the frequency band of 1KHz ~ 100KHz, its operation principle is: when electric current flows through thunder and lightning buffer circuit 42, differential mode inductance L2 and differential mode inductance L3 and parasitic capacitance (or independent capacitance device) thereof and spurious impedance (or individual impedance device) form frequency-selective network, by frequency-selecting effect, make power current frequency band and direct current is without hindrance passes through, and in lightning current frequency band, form transient state high impedance, thus block the transmission of lightning current.
Fig. 5 shows in Fig. 2 and Fig. 3, the circuit of thunder and lightning absorbing circuit 41.
Specifically, thunder and lightning absorbing circuit 41 can comprise: common mode inductance L1, electric capacity Cx1.Wherein, a terminal C1 of common mode inductance L1 side is as the 3rd end of thunder and lightning absorbing circuit 41, another terminal C2 of common mode inductance L1 side is as the 4th end of thunder and lightning absorbing circuit 41, a terminal D1 of common mode inductance L1 opposite side is as the first end of thunder and lightning absorbing circuit 41, and another terminal D2 of common mode inductance L1 opposite side is as the second end of thunder and lightning absorbing circuit 41; Electric capacity Cx1 is connected in parallel between the 3rd end of thunder and lightning absorbing circuit 41 and the 4th end.
In the embodiment of the present invention, electric capacity Cx1 both can be the independent capacitance device of withstand high pressures, also can be the parasitic capacitance that common mode inductance L1 produces.
Find according to research, lightning current energy frequency spectrum is distributed as high frequency, and its energy mainly concentrates on 100Hz ~ 100KHz, and this frequency band energy accounts for more than 95% of gross energy, and wherein the energy of more than 1KHz frequency band accounts for 76%, and near power frequency, the energy of 0 ~ 100Hz only accounts for 2.3%.Therefore, in the embodiment of the present invention, thunder and lightning absorbing circuit 41 specifically realizes the absorption to lightning current energy on the frequency band of 1KHz ~ 100KHz, its operation principle is: when lightning current flows through thunder and lightning absorbing circuit 41 with surge pulse, because electric capacity Cx1 and common mode inductance L1 is energy-storage travelling wave tube, the effect of absorption portion lightning current surge energy thus can be played.
The grouping grounding system that the embodiment of the present invention proposes arranges lightning protection row, working earthing row and protective earthing row respectively; and lightning protection row and working earthing row, protective earthing are provided with thunder and lightning and absorb and buffer circuit between arranging; thus make the ground connection of three types be separated and be independent of each other; effectively prevent cause because lightning current makes earth potential improve electric power, electronic communication equipment system working earthing and casing current potential improve, ensure that the normal work of electric power, electronic communication network and the safety of plant maintenance personnel.Simultaneously; the size of ground network resistance no longer affects the current potential of working earthing, protective earthing; thus ground network resistance is amplified; from less than 5 ohm or 10 ohm that require before; relax to less than 100 ohm, the grounding system that can be 100 ohm at joint grounding resistance reaches effect level and the protection level of grounding system 5 ohm, thus; do not need larger first time construction investment and the investment of maintenance from now on, save the input cost of ground mat construction, build simply.Meanwhile, avoid using the chemicals such as resistance reducing agent, improve the useful life of ground network.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a grouping grounding system, it is characterized in that, described system comprises:
Lightning protection is arranged, and described lightning protection row is provided with at least one lightning protection port;
Working earthing is arranged, and described working earthing row is provided with at least one working earthing port;
Protective earthing is arranged, and described protective earthing row is provided with at least one protective earthing port;
Thunder and lightning absorbs and buffer circuit, described thunder and lightning absorption is connected described lightning protection respectively with two inputs of buffer circuit and arranges, described thunder and lightning absorption is connected described working earthing with an output of buffer circuit and arranges, described thunder and lightning absorption is connected described protective earthing with another output of buffer circuit and arranges, described thunder and lightning absorbs arranges via described lightning protection the part lightning current poured in for storing with buffer circuit, and carry out frequency-selective filtering to arranging via described lightning protection the lightning current poured in, direct current is made and power current is without hindrance passes through to make lightning current to pass through.
2. to divide into groups as claimed in claim 1 grounding system, it is characterized in that, described thunder and lightning absorbs and comprises with buffer circuit:
Thunder and lightning absorbing circuit, the first end of described thunder and lightning absorbing circuit and the second end absorb two inputs with buffer circuit as described thunder and lightning, described thunder and lightning absorbing circuit arranges the surge energy of the part lightning current poured in via described lightning protection for absorbing, to eliminate the crest energy arranging lightning current surge in the part lightning current poured in via described lightning protection;
Thunder and lightning buffer circuit, the first end of described thunder and lightning buffer circuit is connected the 3rd end and the 4th end of described thunder and lightning absorbing circuit with the second end, 3rd end of described thunder and lightning buffer circuit absorbs an output with buffer circuit as described thunder and lightning, 4th end of described thunder and lightning buffer circuit absorbs another output with buffer circuit as described thunder and lightning, the electric current that described thunder and lightning buffer circuit is used for described thunder and lightning absorbing circuit exports carries out frequency-selective filtering, makes direct current and power current is without hindrance passes through to make lightning current to pass through.
3. to divide into groups as claimed in claim 1 grounding system, it is characterized in that, described thunder and lightning absorbs and comprises with buffer circuit:
Thunder and lightning buffer circuit, 3rd end of described thunder and lightning buffer circuit and the 4th end absorb two inputs with buffer circuit as described thunder and lightning, described thunder and lightning buffer circuit is used for carrying out frequency-selective filtering to arranging via described lightning protection the lightning current poured in, and makes direct current and power current is without hindrance passes through to make lightning current to pass through;
Thunder and lightning absorbing circuit, 3rd end of described thunder and lightning absorbing circuit is connected first end and second end of described thunder and lightning buffer circuit with the 4th end, the first end of described thunder and lightning absorbing circuit absorbs an output with buffer circuit as described thunder and lightning, second end of described thunder and lightning buffer circuit absorbs another output with buffer circuit as described thunder and lightning, and described thunder and lightning absorbing circuit is for the surge energy of lightning current in the electric current that absorbs described thunder and lightning buffer circuit and export.
4. divide into groups as claimed in claim 2 or claim 3 grounding system, it is characterized in that, described thunder and lightning buffer circuit comprises: differential mode inductance L2 and differential mode inductance L3;
One end of described differential mode inductance L2 is as the first end of described thunder and lightning buffer circuit, and the other end of described differential mode inductance L2 is as the 3rd end of described thunder and lightning buffer circuit; One end of described differential mode inductance L3 is as the second end of described thunder and lightning buffer circuit, and the other end of described differential mode inductance L3 is as the 4th end of described thunder and lightning buffer circuit.
5. divide into groups as claimed in claim 4 grounding system, it is characterized in that, described thunder and lightning absorbing circuit comprises: common mode inductance L1, electric capacity Cx1;
A terminal of described common mode inductance L1 side is as the 3rd end of described thunder and lightning absorbing circuit, another terminal of described common mode inductance L1 side is as the 4th end of described thunder and lightning absorbing circuit, a terminal of described common mode inductance L1 opposite side is as the first end of described thunder and lightning absorbing circuit, and another terminal of described common mode inductance L1 opposite side is as the second end of described thunder and lightning absorbing circuit; Described electric capacity Cx1 is connected in parallel between the 3rd end of described thunder and lightning absorbing circuit and the 4th end.
6. to divide into groups as claimed in claim 5 grounding system, it is characterized in that, described electric capacity Cx1 is the parasitic capacitance that described common mode inductance L1 produces.
7. divide into groups as claimed in claim 2 or claim 3 grounding system, it is characterized in that, described thunder and lightning absorbing circuit comprises: common mode inductance L1, electric capacity Cx1;
A terminal of described common mode inductance L1 side is as the 3rd end of described thunder and lightning absorbing circuit, another terminal of described common mode inductance L1 side is as the 4th end of described thunder and lightning absorbing circuit, a terminal of described common mode inductance L1 opposite side is as the first end of described thunder and lightning absorbing circuit, and another terminal of described common mode inductance L1 opposite side is as the second end of described thunder and lightning absorbing circuit; Described electric capacity Cx1 is connected in parallel between the 3rd end of described thunder and lightning absorbing circuit and the 4th end.
8. to divide into groups as claimed in claim 7 grounding system, it is characterized in that, described electric capacity Cx1 is the parasitic capacitance that produces of described common mode inductance L1 or independent capacitance device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310207188.2A CN104218550B (en) | 2013-05-29 | 2013-05-29 | One kind packet earthed system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310207188.2A CN104218550B (en) | 2013-05-29 | 2013-05-29 | One kind packet earthed system |
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| CN104218550A true CN104218550A (en) | 2014-12-17 |
| CN104218550B CN104218550B (en) | 2017-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525526A (en) * | 2020-04-30 | 2020-08-11 | 广东电网有限责任公司清远供电局 | Ground net isolating device |
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| CN101159377A (en) * | 2007-07-27 | 2008-04-09 | 张庭炎 | Electric power, electronic equipments and network large ground resistance earth distributing method and device |
| CN201435604Y (en) * | 2009-01-05 | 2010-03-31 | 成都新欣神风电子科技有限公司 | Power supply wave filter |
| CN202917971U (en) * | 2012-09-28 | 2013-05-01 | 西安锐晶微电子有限公司 | Transient surge suppressor with EMI function |
| CN203301141U (en) * | 2013-05-29 | 2013-11-20 | 深圳远征技术有限公司 | Packet grounding system |
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2013
- 2013-05-29 CN CN201310207188.2A patent/CN104218550B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159377A (en) * | 2007-07-27 | 2008-04-09 | 张庭炎 | Electric power, electronic equipments and network large ground resistance earth distributing method and device |
| CN201435604Y (en) * | 2009-01-05 | 2010-03-31 | 成都新欣神风电子科技有限公司 | Power supply wave filter |
| CN202917971U (en) * | 2012-09-28 | 2013-05-01 | 西安锐晶微电子有限公司 | Transient surge suppressor with EMI function |
| CN203301141U (en) * | 2013-05-29 | 2013-11-20 | 深圳远征技术有限公司 | Packet grounding system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111525526A (en) * | 2020-04-30 | 2020-08-11 | 广东电网有限责任公司清远供电局 | Ground net isolating device |
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| CN104218550B (en) | 2017-06-23 |
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