CN104901211A - Absorption type grounding circuit and method for reducing grounding impedance - Google Patents
Absorption type grounding circuit and method for reducing grounding impedance Download PDFInfo
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- CN104901211A CN104901211A CN201510338859.8A CN201510338859A CN104901211A CN 104901211 A CN104901211 A CN 104901211A CN 201510338859 A CN201510338859 A CN 201510338859A CN 104901211 A CN104901211 A CN 104901211A
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Abstract
The invention discloses an absorption type grounding circuit and method for reducing grounding impedance. The circuit comprises a grounding grid and a capacitance absorption apparatus. Two ends of the capacitance absorption apparatus are respectively in connection with the grounding grid and a zero potential earth pole. In the method, the capacitance absorption apparatus is in series connection between the grounding grid and the zero potential earth pole. The circuit can improve path conditions of transformer station grounding grid discharge over the ground, absorb shock wave wavefront and reduce grounding impedance, and has the characteristics of excellent grounding effect, low ground potential, convenient installation, reliable operation and low manufacturing cost.
Description
Technical field
The present invention relates to grounding technology, particularly relate to a kind of absorption earthed circuit and the method that can reduce impedance ground.
Background technology
The electric installation of transformer station should be struck by lightning, and major part is in soil resistivity district higher, and the counterattack of its earth potential and shaft tower transient voltage raise, and have a strong impact on the safe operation of electric power system.
Traditional ground connection is laid in ground with metal material, is called earth connection or earth mat, since a nearly generation border, the mankind are on the basis of Ohm's law, with the voltage under linear condition, electric current theory, instruct, develop grounding technology, and to pursue lower earth resistance for target.But, in the process pursuing lower earth resistance, show from reports a large amount of both at home and abroad, the grounding system of a lower earth resistance is not most suitable grounding system, very big difference is had when the characteristic of earthing device under impulse current effect and power current effect, due to the impact of the perceptual weight of earthing device own, show obvious nonlinear time-varying characteristics.
For large-scale grounding network, its perceptual weight cannot be ignored, under the impulse current effects such as the lightning current containing high fdrequency component, the inductive effect of substation ground network is obvious, even play Main Function, lightning current cannot safe and effectively be released, and causes power high voltage power transmission and transformation system dynamic potentials to raise, and superpose with earth potential counterattack voltage, even more serious on the safe operation impact of electric power system.
Summary of the invention
The invention provides a kind of absorption earthed circuit and the method that can reduce impedance ground, which overcome in the existing grounding technology described in background technology, under lightning impulse, due to the inductive effect of ground network, lightning current cannot safe and effectively be released, cause the sharply rising of high voltage power transmission and transforming system transients current potential, and superpose with earth potential counterattack voltage, serious impact is caused on the safe operation of electric power system.
One of the technical solution adopted for the present invention to solve the technical problems is:
Can reduce an absorption earthed circuit for impedance ground, it comprises a ground network and an Absorption Capacitance device, and the two ends of described Absorption Capacitance device are connected with zero potential earth polar with described ground network respectively.
Among one embodiment: described Absorption Capacitance device comprises top crown and bottom crown, top crown and bottom crown are that parallel interval is arranged and electrical isolation, and described top crown is connected with ground network, and described bottom crown is connected with zero potential earth polar.
Among one embodiment: described top crown and bottom crown adopt metal or non-metallic conducting material.
Among one embodiment: the top crown of described Absorption Capacitance device and bottom crown be level between the upper and lower every placement, top crown is more than or equal to the fitting depth of ground network at underground fitting depth.
Two of the technical solution adopted for the present invention to solve the technical problems is:
An absorption earthing method for impedance ground can be reduced, between ground network and zero potential earth polar, be connected in series an Absorption Capacitance device.
Among one embodiment: described ground network, Absorption Capacitance device and zero potential earth polar at underground fitting depth are: ground network < Absorption Capacitance device < zero potential earth polar.
Among one embodiment: described Absorption Capacitance device comprises the top crown positioned opposite in parallel interval and bottom crown, electrical isolation between top crown and bottom crown.
The technical program is compared with background technology, and its tool has the following advantages:
By increasing connection one Absorption Capacitance device between ground network originally and zero potential region, in order in and thunder and lightning situation under ground network produce inductive effect, improve the path condition that grounding net of transformer substation is released over the ground, shock wave wave head absorbs, and reduces impedance ground; Under different edaphic condition, this circuit all has the performance of good ground connection, particularly in high resistivity soil, has good earth effect, has earth potential low, simplicity of design, easy for installation, reliable operation and the low advantage of cost of manufacture.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 depicts structural representation of the present invention.
Embodiment
Please refer to Fig. 1, a kind of absorption earthed circuit that can reduce impedance ground, it comprises ground network 10 and an Absorption Capacitance device 20, and the two ends of described Absorption Capacitance device 20 are connected with zero potential earth polar 30 with described ground network 10 respectively.
Described Absorption Capacitance device 20 comprises top crown 21 and bottom crown 22, and top crown 21 and bottom crown 22 are arranged and electrical isolation in parallel interval, and described top crown 21 is connected with ground network 10, and described bottom crown 22 is connected with zero potential earth polar 30.
Described top crown 21 and bottom crown 22 adopt metal or non-metallic conducting material.
The top crown 21 of described Absorption Capacitance device 20 and bottom crown 22 are in level between the upper and lower every placement, and top crown 21 is more than or equal to the fitting depth of ground network 10 at underground fitting depth.
A kind of absorption earthing method that can reduce impedance ground is between ground network 10 and zero potential earth polar 30, be connected in series an Absorption Capacitance device 20.Described ground network 10, Absorption Capacitance device 20 and zero potential earth polar 30 at underground fitting depth are: ground network 10 < Absorption Capacitance device 20 < zero potential earth polar 30.
The above, be only present pre-ferred embodiments, therefore can not limit scope of the invention process according to this, the equivalence change namely done according to the scope of the claims of the present invention and description with modify, all should still belong in scope that the present invention contains.
Claims (7)
1. can reduce an absorption earthed circuit for impedance ground, it is characterized in that: comprise a ground network and an Absorption Capacitance device, the two ends of described Absorption Capacitance device are connected with zero potential earth polar with described ground network respectively.
2. a kind of absorption earthed circuit that can reduce impedance ground according to claim 1, it is characterized in that: described Absorption Capacitance device comprises top crown and bottom crown, top crown and bottom crown are that parallel interval is arranged and electrical isolation, described top crown is connected with ground network, and described bottom crown is connected with zero potential earth polar.
3. a kind of absorption earthed circuit that can reduce impedance ground according to claim 2, is characterized in that: described top crown and bottom crown adopt metal or non-metallic conducting material.
4. a kind of absorption earthed circuit that can reduce impedance ground according to claim 2, it is characterized in that: the top crown of described Absorption Capacitance device and bottom crown be level between the upper and lower every placement, top crown is more than or equal to the fitting depth of ground network at underground fitting depth.
5. can reduce an absorption earthing method for impedance ground, it is characterized in that: between ground network and zero potential earth polar, be connected in series an Absorption Capacitance device.
6. a kind of absorption earthing method that can reduce impedance ground according to claim 5, is characterized in that: described ground network, Absorption Capacitance device and zero potential earth polar at underground fitting depth are: ground network < Absorption Capacitance device < zero potential earth polar.
7. a kind of absorption earthing method that can reduce impedance ground according to claim 5, is characterized in that: described Absorption Capacitance device comprises the top crown positioned opposite in parallel interval and bottom crown, electrical isolation between top crown and bottom crown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510338859.8A CN104901211A (en) | 2015-06-17 | 2015-06-17 | Absorption type grounding circuit and method for reducing grounding impedance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510338859.8A CN104901211A (en) | 2015-06-17 | 2015-06-17 | Absorption type grounding circuit and method for reducing grounding impedance |
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| CN104901211A true CN104901211A (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510338859.8A Pending CN104901211A (en) | 2015-06-17 | 2015-06-17 | Absorption type grounding circuit and method for reducing grounding impedance |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529664A (en) * | 2016-01-28 | 2016-04-27 | 国网山西省电力公司临汾供电公司 | Lightning protection system for high-voltage line |
| CN105552593A (en) * | 2016-01-28 | 2016-05-04 | 国网山西省电力公司临汾供电公司 | Low-impedance lightning protection system of high-voltage circuit |
| CN108896825A (en) * | 2018-06-05 | 2018-11-27 | 国网甘肃省电力公司电力科学研究院 | Harmonic wave grid grounding impedance measurement method with vertical grounding electrode or deep-well earth mat |
| CN112147463A (en) * | 2020-09-25 | 2020-12-29 | 云南电网有限责任公司红河供电局 | Method and device for reducing grounding impedance of transformer substation grounding grid by additionally arranging capacitor module |
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| SU634408A1 (en) * | 1977-04-18 | 1978-11-25 | Саратовский политехнический институт | Electric installation overvoltage protection arrangement |
| CN1069599A (en) * | 1991-08-21 | 1993-03-03 | 东北电业管理局多种经营管理局 | Reduce the grounding technology of earth resistance |
| CN2927440Y (en) * | 2006-04-30 | 2007-07-25 | 戴争鸣 | Sudden-wave absorbing grounding system |
| CN103336177A (en) * | 2013-06-07 | 2013-10-02 | 国家电网公司 | Testing method for ground resistance and ground capacitance of grounding network |
| CN204681084U (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | A kind of absorption earthed circuit that can reduce impedance ground |
-
2015
- 2015-06-17 CN CN201510338859.8A patent/CN104901211A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU634408A1 (en) * | 1977-04-18 | 1978-11-25 | Саратовский политехнический институт | Electric installation overvoltage protection arrangement |
| CN1069599A (en) * | 1991-08-21 | 1993-03-03 | 东北电业管理局多种经营管理局 | Reduce the grounding technology of earth resistance |
| CN2927440Y (en) * | 2006-04-30 | 2007-07-25 | 戴争鸣 | Sudden-wave absorbing grounding system |
| CN103336177A (en) * | 2013-06-07 | 2013-10-02 | 国家电网公司 | Testing method for ground resistance and ground capacitance of grounding network |
| CN204681084U (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | A kind of absorption earthed circuit that can reduce impedance ground |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529664A (en) * | 2016-01-28 | 2016-04-27 | 国网山西省电力公司临汾供电公司 | Lightning protection system for high-voltage line |
| CN105552593A (en) * | 2016-01-28 | 2016-05-04 | 国网山西省电力公司临汾供电公司 | Low-impedance lightning protection system of high-voltage circuit |
| CN108896825A (en) * | 2018-06-05 | 2018-11-27 | 国网甘肃省电力公司电力科学研究院 | Harmonic wave grid grounding impedance measurement method with vertical grounding electrode or deep-well earth mat |
| CN112147463A (en) * | 2020-09-25 | 2020-12-29 | 云南电网有限责任公司红河供电局 | Method and device for reducing grounding impedance of transformer substation grounding grid by additionally arranging capacitor module |
| CN112147463B (en) * | 2020-09-25 | 2022-11-04 | 云南电网有限责任公司红河供电局 | Method and device for reducing grounding impedance of transformer substation grounding grid by additionally arranging capacitor module |
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Application publication date: 20150909 |