CN204228827U - A kind of Tower Impulse Grounding Resistance site survey systems - Google Patents
A kind of Tower Impulse Grounding Resistance site survey systems Download PDFInfo
- Publication number
- CN204228827U CN204228827U CN201420509693.2U CN201420509693U CN204228827U CN 204228827 U CN204228827 U CN 204228827U CN 201420509693 U CN201420509693 U CN 201420509693U CN 204228827 U CN204228827 U CN 204228827U
- Authority
- CN
- China
- Prior art keywords
- tower
- impulse
- group
- voltage
- site survey
- 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.)
- Active
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses a kind of Tower Impulse Grounding Resistance site survey systems, comprising: impulsive discharge loop, comprises tower grounding downlead, beam lead-in wire, the one group of insulated support supporting beam lead-in wire and impulse current generator; Surge voltage measuring circuit, comprise the voltage divider high-voltage arm slotted line, voltage divider and the pressure testing oscillograph that are electrically connected successively, this loop also comprises the one group of insulated support supporting described voltage divider high-voltage arm slotted line, and impulsive discharge loop and surge voltage measuring circuit are 15 ° ~ 30 ° angles; Backflow pole, comprising one group of Metallic rod and be unified into array, telefault and flow measurement oscillograph, is driven underground in described one group of Metallic rod side.A kind of Tower Impulse Grounding Resistance site survey systems of the present utility model, adopt slotted line and lead wire insulation erection mode and the pole ground array that refluxes, realize adapting to on-site soil speciality erection modulating system, under large impact electric current, system can safety, stably measured obtain impulse earthed resistance accurately.
Description
Technical field
The utility model relates to a kind of electric system measuring impulse earthed resistance, is specifically related to a kind of Tower Impulse Grounding Resistance site survey systems based on heavy impulse current.
Background technology
Stake resistance refers to the resistance when power frequency or DC current flow through, and is usually called power frequency (or direct current) stake resistance, and resistance when lightning protection lightning impulse current is flow through, be called impulse earthed resistance.At the beginning of last century, what people extensively adopted the is equipment such as voltage, reometer is to carry out the experiment of voltammetry stake resistance, and experimental error is very big.In recent years, along with the utilization of Computer Control Technology, intelligent ground resistance measuring instrument arises at the historic moment, as SD-301 type, GPI-745A type, GCT-630 type.But find after deliberation, above-mentioned instrument all adopts the way of output of AC or DC, well can not reflect grounding body presents under thunder and lightning effect impact characteristics and impedance operator, and all belong to the category of power-frequency earthing impedance.
The earthy rising of steel tower earth mat under into the effect of research lightning current is disclosed in the measurement of stake resistance " under the Electrode for Impulse Gurrents " literary composition that the people such as Wang Jianguo, the summer Long March, Wen Xishan deliver in " High-Voltage Technology ", with impulse current generator, Grounding Grids impulse earthed resistance is tested, and give test findings, but have employed the transmission line of single, double shielded cable as signal acquiring system in test, test waveform serious interference, easy distortion.A kind of electric system shaft tower impact grounding impedance measuring system is provided in Master's thesis " development of a shaft tower impact grounding impedance measuring system " literary composition of battalion of grandson family of Xihua Univ, adopting voltage-multiplying circuit to obtain maximal value is that the DC voltage of 2kV is to high-voltage capacitor charging, adopt shunt and digital recorder and utilize plain conductor directly to gather impact current data, test waveform is easily disturbed.In a word, existing impact grounding impedance measuring system well can not reflect the impact characteristics and impedance operator that grounding body presents under thunder and lightning effect, and its weak point main manifestations is that test waveform is disturbed seriously, and measuring error is larger.
Utility model content
The purpose of this utility model is to overcome above-mentioned deficiency, a kind of Tower Impulse Grounding Resistance site survey systems based on heavy impulse current is provided, realize adapting to on-site soil speciality modulation construction system, under large impact electric current, system can safety, stably measured obtain accurate stake resistance.
For reaching the object of above-mentioned utility model, the utility model is achieved through the following technical solutions:
A kind of Tower Impulse Grounding Resistance site survey systems of the present utility model, comprises as follows:
Impulsive discharge loop, it comprises tower grounding downlead, beam lead-in wire, the first group of insulated support supporting beam lead-in wire of drawing from tower grounding downlead and to go between the impulse current generator be electrically connected with beam;
Surge voltage measuring circuit, it comprises the voltage divider high-voltage arm slotted line, voltage divider and the pressure testing oscillograph that are electrically connected successively, this loop also comprises the second group of insulated support supporting described voltage divider high-voltage arm slotted line, described voltage divider high-voltage arm slotted line is drawn from tower grounding downlead, 15 ° ~ 30 ° angles are become between the impulsive discharge loop linearly arranged with the same surge voltage measuring circuit linearly arranged, impulse voltage divider is low-pressure side ground connection, and earth point is as Zero potential reference;
Backflow pole, comprise one group and be unified into the 3rd group of insulated support, telefault and flow measurement oscillograph of the Metallic rod of array, return lead, support return lead, be driven underground in described one group of Metallic rod side, opposite side concurrent connects return lead, return lead is electrically connected impulse current generator one end through after telefault, flow measurement oscilloscope measurement end electrical connection telefault.
Long 100 meters of impulsive discharge loop or more, impulse current generator is apart from backflow pole earth point 10 meters to 20 meters, and voltage measurement circuit is 150m or more, and Zero potential reference is apart from backflow pole 50m or more, and ground distance is 10 meters to 20 meters.Due to backflow being extremely negative potential, and numerical value is higher, and in order to ensure the accuracy of measuring voltage, Zero potential reference needs away from backflow pole.
Described first group of insulated support and second group of insulated support are all adopt every 5 meters of epoxy tubes established on ground, and described beam lead-in wire or voltage divider high pressure wall slotted line are fixed with band in epoxy tube top.
One group of Metallic rod of backflow pole adopts four length 1m, the tip bar parallel of diameter 20mm, and bar spacing forms the quadrate array of 0.5m × 0.5m, and reinforcing bar pointed portion is vertically driven underground dark 0.7m, and basset 0.3m.The reinforcing bar number adopted in theory is The more the better, but realizes the diminishing marginal benefits of water conservancy diversion effect, considers workload and adopts above-mentioned four reinforcing bars.
Zero potential reference electrode used therein adopts a length 1m, and the tip reinforcing bar of diameter 20mm is driven underground dark 0.7m, and basset 0.3m.
Described impulse current generator adopts generator powered, and described pressure testing oscillograph and flow measurement oscillograph all adopt ups power to power.
Described impulse current generator electric pressure is 100kV or more, short-circuit output current amplitude 10kA or more, wave front time 1 ~ 4 μ s.
Compared with prior art, the utility model tool has the following advantages:
A kind of Tower Impulse Grounding Resistance site survey systems of the present utility model utilizes the impact test equipments such as impulse current generator, oscillograph, voltage divider, current coil, adopts slotted line and lead wire insulation erection mode and the pole ground array that refluxes.The Tower Impulse Grounding Resistance site survey systems of such formation, achieves and adapts to on-site soil speciality erection modulating system, and under large impact electric current, system can safety, stably measured obtain accurate stake resistance.
Accompanying drawing explanation
Fig. 1 is the erecting structure schematic diagram of a kind of Tower Impulse Grounding Resistance site survey systems of the present utility model.
Fig. 2 is the insulated support schematic diagram of a kind of Tower Impulse Grounding Resistance site survey systems of the present utility model.
Fig. 3 is the backflow pole ground array schematic diagram of a kind of Tower Impulse Grounding Resistance site survey systems of the present utility model.
Current waveform figure when Fig. 4 is the charging voltage 20kV of a kind of Tower Impulse Grounding Resistance site survey systems of the present utility model.
Voltage oscillogram when Fig. 5 is the charging voltage 20kV of a kind of Tower Impulse Grounding Resistance site survey systems of the present utility model.
Fig. 6 is that the utility model measures the Tower Impulse Grounding Resistance of gained with current amplitude variation diagram.
Embodiment
Be clearly and completely described the technical scheme in the utility model embodiment below in conjunction with drawings and Examples, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.
Refer to Fig. 1, the embodiment of a kind of Tower Impulse Grounding Resistance site survey systems of the present utility model, the building of Tower Impulse Grounding Resistance site survey systems of this embodiment adopts following equipment and material:
1) impulse current generator (more than electric pressure 100kV, more than short-circuit output current amplitude 10kA, wave front time 1 ~ 4 μ s);
2) diesel-driven generator (220kV/5kW);
3) oscillograph × 2;
4) ups power × 2;
5) voltage divider (intrinsic standoff ratio is 1000:1);
6) electro-insulating rubber pad (thickness ≮ 10mm);
7) copper braid over braid 120m (width ≮ 20mm);
8) copper wire line 180m (diameter of phi ≮ 3mm);
9) tip reinforcing bar × 5 (diameter of phi ≮ 20mm);
10) ground wire is some;
11) band is some;
The Tower Impulse Grounding Resistance site survey systems of the present embodiment comprises impulsive discharge loop, surge voltage measuring circuit and backflow pole 116, impulsive discharge loop draws a beam lead-in wire 110 from tower grounding downlead 114, and beam lead-in wire 110 reaches after 90 meters away from this tower grounding downlead 114 and is electrically connected with the negative pole end of impulse current generator 111; Surge voltage measuring circuit draws a voltage divider high-voltage arm slotted line 120 from tower grounding downlead 114, voltage divider high-voltage arm slotted line 120 reaches after 140 meters away from tower grounding downlead 114 and is electrically connected with the high-pressure side of voltage divider 121, voltage divider 121 draws ground lead 124 ground connection of 10 meters to 20 meters in low-pressure side, and institute's earth point is as Zero potential reference; Backflow pole 116 is the Metallic rod adopting into array, insertion ground, side, the return lead 112 of one 10 meters to 20 meters is drawn through the positive terminal being electrically connected impulse current generator 111 after telefault 115, flow measurement oscillograph 113 measuring junction electrical connection telefault 115 after opposite side conllinear.
Please composition graphs 2 and Fig. 3 further, be convenient to clearlyer understand the concrete structure of the present embodiment and electrical principle.
Beam lead-in wire 110 adopts 90m long, width be the copper braid over braid of 20mm as conductive medium, return lead adopts 10m long, and width is that the copper braid over braid of 20mm is as conductive medium.
Because the shaft tower earth mat size at tower grounding downlead 114 place is large, backflow pole 116 must be located at outside earth mat scope, above-mentioned return lead 112 and main flow go between 110 length sum up and reach 100m, thus make to reflux pole 116 away from shaft tower earth mat.
As shown in Figure 2, establish the epoxy tube 210 of a diameter 18mm on the line every 5m, adopt the fixing required circuit supported of band 212 in epoxy tube 210 upper end.The hollow epoxy tube 210 that the second group of insulated support support first group of insulated support of beam lead-in wire 110, supporting voltage divider high-voltage arm slotted line 120 and the 3rd group of insulated support supporting return lead 112 all adopt aforesaid way to arrange.
As shown in Figure 3, backflow pole 116 adopts four length 1m, the tip bar parallel of diameter 20mm, bar spacing forms the quadrate array of 0.5m × 0.5m, reinforcing bar pointed portion is vertically driven underground dark 0.7m, and basset 0.3m, and four reinforcing bar epimeres are wrapped with return lead 116.
A Zero potential reference length 1m, the reinforcing bar of diameter 20mm, reinforcing bar pointed portion is vertically driven underground dark 0.7m, and basset 0.3m.
When measuring shaft tower earth mat potential rise, due to pole 116 of refluxing in impact process being negative potentials, Zero potential reference must away from backflow level 116 and shaft tower earth mat.As shown in Figure 1, Zero potential reference is set in the position that distance tower grounding downlead 114 has 150m by the present embodiment, the angle in the voltage divider high-voltage arm slotted line 120 linearly arranged and 110 one-tenth 15 ° to 30 °, the same impulsive discharge loop linearly arranged, now Zero potential reference is arranged on the place straight line of voltage divider high-voltage arm slotted line 120, accordingly, Zero potential reference and backflow pole 116 are at a distance of 50m or more.Shaft tower earth mat potential rise measured by the pressure testing oscillograph 123 connected by voltage divider 121, voltage divider 121 is apart from Zero potential reference 10m, voltage divider high-voltage arm slotted line 120 is the copper wire line electrical connection tower grounding downleads 116 adopting tape insulation layer, and the ground lead 124 of voltage divider 121 low-voltage arm connects Zero potential reference by the copper wire line of tape insulation layer.
In system building, impulse current generator 111 adopts diesel-driven generator to power, flow measurement oscillograph 113 is by the current signal of signal wire receiving inductance coil 115, pressure testing oscillograph 123 receives the voltage signal on voltage divider 121 by signal wire, and flow measurement oscillograph 113 and pressure testing oscillograph 123 all adopt UPS Power supply.
Comparatively large owing to impacting circuit in impact process, there is earth potential liter in ground, and electrical equipment needs to insulate with ground.The electro-insulating rubber pad that on the device ground pads such as impulse current generator 111, diesel-driven generator, flow measurement oscillograph 113, pressure testing oscillograph 123, signal cable and ups power, 10mm is thick.Generator and impulse current generator 111 are connected to by ground wire pole 116 of refluxing, and ensure impulse current generator 111 each several part and the same current potential of diesel-driven generator.
The use of the Tower Impulse Grounding Resistance site survey systems of the present embodiment is as follows:
1) winner four-electrode method surveys on-site soil resistivity, in same direction with five meters for spacing surveys three groups, survey both direction and average;
2) three electrode method surveys power frequency earthing resistance;
3) disconnect shaft tower down conductor, four radioactive ray beams, charging voltage changes in units of 20kV from 20kV ~ 80kV, carries out impulse test, and USB flash disk connects oscillograph storage test data;
4) connect shaft tower down conductor, four radioactive ray beams, charging voltage changes in units of 20kV from 20kV ~ 80kV, carries out impulse test, and USB flash disk connects oscillograph storage test data.
The present invention carries out impulse test at Wuhan Huang Po shaft tower, and when test oscillograph storage charging voltage is 20kV, impulse current waveform is as Fig. 4, and High Voltage Impulse Waveform is as Fig. 5.
On-the-spot test on pole-tower research shaft tower earth mat impulse earthed resistance with current amplitude change curve as shown in Figure 6.
Tower Impulse Grounding Resistance site survey systems of the present utility model utilizes the impact test equipments such as impulse current generator, oscillograph, voltage divider, current coil, adopts slotted line and lead wire insulation erection mode and the pole ground array that refluxes.The Tower Impulse Grounding Resistance site survey systems of such formation, achieves and adapts to on-site soil speciality erection modulating system, and under large impact electric current, system can safety, stably measured obtain accurate stake resistance.
Above-described embodiment only in order to the utility model is described and and technical scheme described by unrestricted the utility model; Therefore, although this instructions has been described in detail the utility model with reference to each above-mentioned embodiment, those of ordinary skill in the art should be appreciated that and still can modify to the utility model or equivalent replacement; And all do not depart from technical scheme and the improvement thereof of spirit and scope of the present utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (7)
1. a Tower Impulse Grounding Resistance site survey systems, is characterized in that, comprises as follows:
Impulsive discharge loop, it comprises tower grounding downlead, beam lead-in wire, the first group of insulated support supporting beam lead-in wire of drawing from tower grounding downlead and to go between the impulse current generator be electrically connected with beam;
Surge voltage measuring circuit, it comprises the voltage divider high-voltage arm slotted line, voltage divider and the pressure testing oscillograph that are electrically connected successively, this loop also comprises the second group of insulated support supporting described voltage divider high-voltage arm slotted line, described voltage divider high-voltage arm slotted line is drawn from tower grounding downlead, 15 ° ~ 30 ° angles are become between the impulsive discharge loop linearly arranged with the same surge voltage measuring circuit linearly arranged, impulse voltage divider is low-pressure side ground connection, and earth point is as Zero potential reference;
Backflow pole, comprise one group and be unified into the 3rd group of insulated support, telefault and flow measurement oscillograph of the Metallic rod of array, return lead, support return lead, be driven underground in described one group of Metallic rod side, opposite side concurrent connects return lead, return lead is electrically connected impulse current generator one end through after telefault, flow measurement oscilloscope measurement end electrical connection telefault.
2. a kind of Tower Impulse Grounding Resistance site survey systems according to claim 1, it is characterized in that: long 100m in impulsive discharge loop or more, impulse current generator is apart from backflow pole earth point 10m to 20m, voltage measurement circuit is 150m or more, Zero potential reference is apart from backflow pole 50m or more, and ground distance is 10m to 20m.
3. a kind of Tower Impulse Grounding Resistance site survey systems according to claim 1, it is characterized in that: described first group of insulated support and second group of insulated support are all adopt every 5 meters of epoxy tubes established on ground, and described beam lead-in wire or voltage divider high pressure wall slotted line are fixed with band in epoxy tube top.
4. a kind of Tower Impulse Grounding Resistance site survey systems according to claim 1, it is characterized in that: one group of Metallic rod of backflow pole adopts four length 1m, the tip bar parallel of diameter 20mm, bar spacing forms the quadrate array of 0.5m × 0.5m, reinforcing bar pointed portion is vertically driven underground dark 0.7m, and basset 0.3m.
5. a kind of Tower Impulse Grounding Resistance site survey systems according to claim 1, is characterized in that: Zero potential reference electrode used therein adopts a length 1m, and the tip reinforcing bar of diameter 20mm is driven underground dark 0.7m, and basset 0.3m.
6. a kind of Tower Impulse Grounding Resistance site survey systems according to claim 1, is characterized in that: described impulse current generator adopts generator powered, and described pressure testing oscillograph and flow measurement oscillograph all adopt ups power to power.
7. a kind of Tower Impulse Grounding Resistance site survey systems according to claim 1, is characterized in that: described impulse current generator electric pressure is 100kV or more, short-circuit output current amplitude 10kA or more, wave front time 1 ~ 4 μ s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420509693.2U CN204228827U (en) | 2014-09-04 | 2014-09-04 | A kind of Tower Impulse Grounding Resistance site survey systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420509693.2U CN204228827U (en) | 2014-09-04 | 2014-09-04 | A kind of Tower Impulse Grounding Resistance site survey systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204228827U true CN204228827U (en) | 2015-03-25 |
Family
ID=52926907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420509693.2U Active CN204228827U (en) | 2014-09-04 | 2014-09-04 | A kind of Tower Impulse Grounding Resistance site survey systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204228827U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931852A (en) * | 2015-05-28 | 2015-09-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct current earth electrode line flashover fault circuit model, analysis method and system based on arcing of arcing horn |
| CN105652093A (en) * | 2015-12-30 | 2016-06-08 | 国家电网公司 | Grounding device impact grounding impedance test method |
| CN106771639A (en) * | 2016-12-14 | 2017-05-31 | 国家电网公司 | High pressure pole tower ground resistance on-line monitoring system |
| CN106841814A (en) * | 2017-01-26 | 2017-06-13 | 江苏德大自动化设备有限公司 | Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method |
| CN107219423A (en) * | 2017-06-06 | 2017-09-29 | 中国电力科学研究院 | Lightning impulse response measurement system |
| CN107329056A (en) * | 2017-07-10 | 2017-11-07 | 国网浙江省电力公司宁波供电公司 | Test method for distribution line natural grounding substance impact characteristics |
| CN107490725A (en) * | 2017-08-04 | 2017-12-19 | 上海建科检验有限公司 | The pole method of testing of special industry place grounding resistance three |
| CN107728024A (en) * | 2017-10-27 | 2018-02-23 | 清华大学 | A kind of large-scale grounding network impact characteristics method of testing to be flowed back using earth mat |
| CN109342822A (en) * | 2018-11-29 | 2019-02-15 | 国网福建省电力有限公司电力科学研究院 | Tower Impulse Grounding Resistance detection method and device |
| CN109444554A (en) * | 2018-11-01 | 2019-03-08 | 国网新疆电力有限公司检修公司 | Quickly withdraw the device of earth loop impedance test line |
| CN110501549A (en) * | 2019-07-19 | 2019-11-26 | 武汉大学 | A kind of measurement method of tower body impact high voltage |
-
2014
- 2014-09-04 CN CN201420509693.2U patent/CN204228827U/en active Active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931852B (en) * | 2015-05-28 | 2018-03-09 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | The direct current grounding pole line flashover failure analysis methods of arc are built based on arcing horn |
| CN104931852A (en) * | 2015-05-28 | 2015-09-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct current earth electrode line flashover fault circuit model, analysis method and system based on arcing of arcing horn |
| CN105652093A (en) * | 2015-12-30 | 2016-06-08 | 国家电网公司 | Grounding device impact grounding impedance test method |
| CN106771639A (en) * | 2016-12-14 | 2017-05-31 | 国家电网公司 | High pressure pole tower ground resistance on-line monitoring system |
| CN106771639B (en) * | 2016-12-14 | 2019-11-15 | 国家电网有限公司 | High pressure pole tower ground resistance on-line monitoring system |
| CN106841814A (en) * | 2017-01-26 | 2017-06-13 | 江苏德大自动化设备有限公司 | Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method |
| CN107219423A (en) * | 2017-06-06 | 2017-09-29 | 中国电力科学研究院 | Lightning impulse response measurement system |
| CN107329056A (en) * | 2017-07-10 | 2017-11-07 | 国网浙江省电力公司宁波供电公司 | Test method for distribution line natural grounding substance impact characteristics |
| CN107490725A (en) * | 2017-08-04 | 2017-12-19 | 上海建科检验有限公司 | The pole method of testing of special industry place grounding resistance three |
| CN107728024A (en) * | 2017-10-27 | 2018-02-23 | 清华大学 | A kind of large-scale grounding network impact characteristics method of testing to be flowed back using earth mat |
| CN107728024B (en) * | 2017-10-27 | 2020-09-04 | 清华大学 | Large-scale grounding grid impact characteristic testing method utilizing grounding grid backflow |
| CN109444554A (en) * | 2018-11-01 | 2019-03-08 | 国网新疆电力有限公司检修公司 | Quickly withdraw the device of earth loop impedance test line |
| CN109342822A (en) * | 2018-11-29 | 2019-02-15 | 国网福建省电力有限公司电力科学研究院 | Tower Impulse Grounding Resistance detection method and device |
| CN110501549A (en) * | 2019-07-19 | 2019-11-26 | 武汉大学 | A kind of measurement method of tower body impact high voltage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204228827U (en) | A kind of Tower Impulse Grounding Resistance site survey systems | |
| US20150362536A1 (en) | High-voltage direct current broad frequency-domain corona current measurement system | |
| CN102608394B (en) | Line corona current measurement system and method | |
| WO2014173314A1 (en) | System for testing property of thunder and lightning traveling wave of power transmission line | |
| CN104569608A (en) | Method for measuring impact grounding impedance on site based on large impact current | |
| CN103424652A (en) | Impact performance simulation test method and device for grounding body with large simulated size and large amplitude value | |
| CN102914731B (en) | Device for detecting point discharge in transformer oil under impulse voltage based on dual electrodes | |
| CN105510721B (en) | A kind of New Device for Grounding Resistance Measurement of Grounding Grids and its application method | |
| CN105652093A (en) | Grounding device impact grounding impedance test method | |
| Cai et al. | Observation of natural lightning-induced voltage on overhead power lines | |
| CN107632203A (en) | A kind of large ground network earth loop impedance test method for considering earth effect | |
| CN110849799B (en) | Device for researching interference of stray current on buried pipeline cathode protection system | |
| CN107843784A (en) | A kind of large-scale grounding network high frequency characteristics method of testing to be flowed back using earth mat | |
| CN103487725B (en) | A kind of overhead distribution earth fault indicating device based on zero-sequence component method | |
| CN203164258U (en) | High-voltage direct current wide frequency domain corona current measuring system | |
| Ametani | Lightning surge analysis by EMTP and numerical electromagnetic analysis method | |
| CN107728024B (en) | Large-scale grounding grid impact characteristic testing method utilizing grounding grid backflow | |
| CN109884400A (en) | Transmission tower ground resistance on-Line Monitor Device based on double measurement patterns | |
| CN110456176A (en) | A kind of calculation method of high altitude localities ultra-high-tension power transmission line radio interference level | |
| CN203587736U (en) | Overhead distributing line ground fault indicating device based on zero-sequence component method | |
| CN203773008U (en) | Impact characteristic simulation test device for grounding body with large simulated size and large amplitude value | |
| Huang et al. | Characteristics of the flexible graphite grounding material and its engineering application | |
| Cai et al. | Effects of surge protective devices on overhead power line induced voltage from natural lightning | |
| CN202563012U (en) | Large-scale power station grounding net impedance parameter measuring device | |
| CN111856143A (en) | Grounding impedance test method and device for eliminating mutual inductance influence |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |