CN102621435A - Grounding simulation testing device and method - Google Patents

Grounding simulation testing device and method Download PDF

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Publication number
CN102621435A
CN102621435A CN2012101173511A CN201210117351A CN102621435A CN 102621435 A CN102621435 A CN 102621435A CN 2012101173511 A CN2012101173511 A CN 2012101173511A CN 201210117351 A CN201210117351 A CN 201210117351A CN 102621435 A CN102621435 A CN 102621435A
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CN
China
Prior art keywords
earthing
test
grounding
resistivity
transparent
Prior art date
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CN2012101173511A
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Chinese (zh)
Inventor
李景禄
满超楠
贾莹坤
Original Assignee
李景禄
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Application filed by 李景禄 filed Critical 李景禄
Priority to CN2012101173511A priority Critical patent/CN102621435A/en
Publication of CN102621435A publication Critical patent/CN102621435A/en

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Abstract

The invention discloses a grounding simulation testing device and a grounding simulation testing method. The grounding simulation testing device consists of a transparent container, a transparent liquid medium and an equivalently-contracted grounding device model. The method comprises the following steps of: simulating the variation of earth resistivity by adjusting the resistivity of the liquid medium in the transparent container; simulating non-uniform distribution of soil resistivity by arranging a horizontal or vertical insulated spacer layer in the transparent container; simulating grounding devices of different types by changing the shape of the grounding device model; simulating different grounding device types or the dispersion processes and dispersion mechanisms of different soil structures flowing through working frequency, direct-current and lightning impulse current by arranging working frequency, direct-current and impact testing power supplies; embedding a sampling sensor; measuring needed testing parameters; and recording a testing process through a video camera. The grounding simulation testing device and the method have the advantages of simple and compact structure, easiness in operating and high equivalence.

Description

Ground connection simulation test device and method
Technical field
The present invention is mainly concerned with the lightning protection field, refers in particular to a kind of ground connection simulation test device and method.
Background technology
Earthing device is one of most important link in the shocking preventing technology, and when the ground short circuit fault took place, power frequency earth short circuit current and lightning impulse current were when going into ground through earthing device; Because the distribution of current on the earthing pole is uneven, and different along with the state parameters such as shape, buried depth and shielding factor of earthing device, the distribution of ground current is different; Local current densities at earthing pole reaches maximal value, causes internal field's field intensity to concentrate, and earth potential raises; Produce dangerous touch voltage and step voltage; If there is this moment the people movable nearby, will produce pickup current by touch voltage, step voltage produces the electric current that strides; Life security to the people constitutes a threat to, and can cause human casualty accident when serious.
Research during ground short circuit personal safety factors of influence such as the touch voltage that produces, pickup current, step voltage and the electric current that strides not only relevant with the short-circuit current duration with the amplitude of short-circuit current; Also relevant with state parameters such as the layout pattern of earthing device, buried depth, shape coefficient, coefficient of impact, impedance grounds, relevant with soil soil property parameter around the earthing device and each to the uneven distribution situation.For carry out above-mentioned research must be to earthing device diffusing during through power frequency, direct current and lightning impulse current flow through journey and parameter distribution is carried out simulation test, to understand the diffusing stream rule and the spark discharge process of earthing device.
The normal at present performance that adopts on-the-spot actual measurement, 2 kinds of method assessments of simulation test earthing device.
1, actual measurement method: because the scene provides heavy impulse current to have any problem, adopt the method testing expense of actual earthmeter high, operation easier is big, and must on the electrical network that builds up, test, and can not in design process, adopt.
2, experimental analogic method: the simulation test investment is little, easy and simple to handle, can conveniently change earthing device model topology structure, and the impact characteristics that adopts the method research earthed system of simulation test is an important means of ground connection research.Present existing simulation test fado is a groundwater simulation, promptly digs a semisphere ground connection pond underground, uses the fine sand simulated soil, improves soil resistivity with the heater heats fine sand that is embedded in the sand, adds water or salt solution reduces soil resistivity.Though this method realizes more easily that than the little dash current of on-the-spot true type its sand pond coats with iron sheet, soil is simulated with fine sand, and what it adopted all is non-transparent material, is not easy to observe the spark discharge phenomenon of soil; It is through to fine sand heating and the method that adds water or salt solution comes the variation of simulated soil resistivity to be not easy to operation and degree of accuracy is difficult to grasp; The device that this method provides is fixed on a place, can't move, and is connected inconvenient with the large-scale experiment power supply; This method can not embody the uneven distribution situation of soil resistivity along different directions.
Summary of the invention
The problem that the present invention will solve just is: to the problem that prior art exists, the present invention provide a kind of easy to operate, can the different ground connection patterns of effecting reaction and the ground connection simulation test device and the method for different soil property situation.
For solving the problems of the technologies described above, the solution that the present invention proposes is: form the ground connection simulation test device by transparent vessel, transparent liquid medium and the equivalent earthing device model that dwindles.Come the variation of simulated soil resistivity through the resistivity of liquid medium in the adjustment transparent vessel; Come the uneven distribution of simulated soil resistivity through built-in level in transparent vessel or vertical isolating separator layer; Simulate the earthing device of different types through the shape that changes the earthing device model; Through adding power frequency, direct current and impulse test power supply, simulate diffusing journey and diffusing stream mechanism, the built-in sampling sensor of flowing through that different earthing device patterns or different soil structure flow through power frequency, direct current and lightning impulse current; Measure required test parameters, through the camera record process of the test.
Description of drawings
Fig. 1 transparent vessel is always schemed;
Fig. 2 transparent vessel elevation cross-sectional view;
Fig. 3 transparent vessel top plan view;
Fig. 4 earthing device illustraton of model;
Fig. 5 ground connection simulation test device wiring diagram.
Embodiment
As shown in Figure 1, the liquid clear medium is injected transparent vessel, the soil horizon around the analogue ground device.Can come the variation of simulated soil resistivity through the resistivity that changes the liquid clear medium.
Like Fig. 2, shown in 3; Level or vertical isolating separator layer (specifically separating the number of plies is set by concrete edaphic structure) are set in the transparent vessel; Effectively link with nut and pad between each separate layer, come the uneven distribution situation of simulated soil resistivity along different directions through the liquid clear medium that in each separate layer, injects different resistivity.
As shown in Figure 4, the earthing device model supports with insulation framework, and the earthing device model of scaled down is comprised that earthing pole places transparent vessel, and the place uses the insulation framework fixed support at corresponding buried depth.Form the ground connection simulation test device.Can simulate the earthing device of different types through the shape that changes the earthing device model.
As shown in Figure 5; Butt joint simulation test unit (transparent vessel (4), transparent liquid medium (5), earthing device model (3,6)) injects DC experiment electric current, industrial frequency experiment electric current or lightning impulse current (1); Connect direct current, power frequency or surge voltage sensor (2) simultaneously; Measure earthing pole region of interest current density and electric field intensity, through the camera record process of the test, the frequency domain characteristic of research ground current looses to ground current and flows the influence of rule and Potential distribution.
Compared with prior art, advantage of the present invention just is: (1) adopts transparent material to come simulated soil, is convenient to observe the spark discharge phenomenon; (2) come simulated soil resistivity with the transparent liquid medium, can make things convenient for the variation of simulated soil resistivity accurately; (3) dielectric level or vertical separate layer are set in the transparent vessel, in each separate layer, inject the liquid clear medium of different resistivity can simulated soil resistivity along the uneven distribution situation of different directions; (4) built-in sensors is convenient to the collection of correlation parameter in the transparent vessel; (5) removable pulley is equipped with in earthing device model bottom, makes things convenient for test operation; (6) laboratory ground connection simulation test device, strong with on-the-spot earthing device comparability, can simulated field different geological structure and different earthing device patterns; (7) the present invention is a kind of simple and compact for structure, good reliability, easy for installation, operation is simple and easy, equivalence is good earthing device simulation test device and method.

Claims (5)

1. ground connection simulation test device and method is characterized in that: earthing device model that simulation test device is dwindled by equivalence and transparent vessel and the transparent liquid medium that injects are wherein formed; The earthing device model that the built-in equivalence of transparent vessel dwindles can add power frequency, direct current and the test of impulse test power supply, measures and write down process of the test through sampling sensor and video camera.
2. the ground connection simulation test device to electric system according to claim 1; It is characterized in that: process circular or square transparent vessel with transparent insulation material; Earthing pole and mobile pulley are equipped with in the bottom; Be provided with level or vertical isolating separator layer at internal tank, in container, inject the transparent liquid medium, soil around the analogue ground device and soil resistivity thereof are respectively to the uneven distribution situation.
3. the ground connection simulation test device to electric system according to claim 1; It is characterized in that: the earthing device model that equivalence dwindles supports with insulation framework; It is positioned in the transparent vessel, can changes its shape as required and be used for simulating difform earthing device.
4. the earthing device simulation experiment method to electric system according to claim 1; It is characterized in that: can be through adding power frequency, direct current and impulse test power supply; Simulate diffusing journey and the diffusing stream mechanism of flowing through that different earthing device patterns or different soil structure flow through power frequency, direct current and lightning impulse current; Built-in sensors is measured required test parameters, through the camera record process of the test.
5. the earthing device simulation experiment method to electric system according to claim 4; It is characterized in that: come the variation of simulated soil resistivity through the resistivity of liquid medium in the adjustment transparent vessel, come the uneven distribution of simulated soil resistivity through built-in level in container or vertical separate layer.
CN2012101173511A 2012-04-20 2012-04-20 Grounding simulation testing device and method CN102621435A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102944771A (en) * 2012-10-24 2013-02-27 中国电力科学研究院 Simulation experiment device and method of alternating current, direct current and impact performance of large earth screen
CN103018536A (en) * 2012-12-25 2013-04-03 宁波电业局 Device and method for measuring dispersal impulse current characteristics of grounding electrode
CN103293451A (en) * 2013-05-24 2013-09-11 华南理工大学 Method of estimating lightning protection of high-voltage transmission line pole/tower earthing device
CN103389742A (en) * 2013-07-29 2013-11-13 国家电网公司 Grounding simulation test positioning system and positioning method thereof
CN103424652A (en) * 2013-07-30 2013-12-04 中国电力科学研究院 Impact performance simulation test method and device for grounding body with large simulated size and large amplitude value
CN103424647A (en) * 2013-05-28 2013-12-04 上海理工大学 Soil body electrical response measuring device under lightning impulse action
CN105929274A (en) * 2016-05-03 2016-09-07 国网江西省电力科学研究院 Apparatus and method for impact current test of dimension adjustable grounding module
CN106597114A (en) * 2016-11-28 2017-04-26 国家电网公司 Simulated grounding test system and method for grounding material
CN108020739A (en) * 2017-11-29 2018-05-11 中国南方电网有限责任公司超高压输电公司广州局 A kind of method for reducing deep well grounding electrode maximum current density

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CN201828638U (en) * 2010-09-28 2011-05-11 达州电业局 Portable multifunctional insulating tool test rack
CN102298108A (en) * 2011-05-25 2011-12-28 重庆大学 Impact characteristic simulation test apparatus of earthing device and method thereof

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CN101592585A (en) * 2009-07-07 2009-12-02 山东电力研究院 Evaluation device for grounding material for electric power system
CN201828638U (en) * 2010-09-28 2011-05-11 达州电业局 Portable multifunctional insulating tool test rack
CN102298108A (en) * 2011-05-25 2011-12-28 重庆大学 Impact characteristic simulation test apparatus of earthing device and method thereof

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102944771B (en) * 2012-10-24 2015-01-07 中国电力科学研究院 Simulation experiment device and method of alternating current, direct current and impact performance of large earth screen
CN102944771A (en) * 2012-10-24 2013-02-27 中国电力科学研究院 Simulation experiment device and method of alternating current, direct current and impact performance of large earth screen
CN103018536B (en) * 2012-12-25 2016-01-20 宁波电业局 A kind of earthing pole impacts characteristics of the dispersed flow measurement mechanism and method
CN103018536A (en) * 2012-12-25 2013-04-03 宁波电业局 Device and method for measuring dispersal impulse current characteristics of grounding electrode
CN103293451A (en) * 2013-05-24 2013-09-11 华南理工大学 Method of estimating lightning protection of high-voltage transmission line pole/tower earthing device
CN103293451B (en) * 2013-05-24 2015-10-28 华南理工大学 A kind of appraisal procedure of high-voltage transmission line pole tower earthing device lightning protection characteristic
CN103424647A (en) * 2013-05-28 2013-12-04 上海理工大学 Soil body electrical response measuring device under lightning impulse action
CN103424647B (en) * 2013-05-28 2015-12-23 上海理工大学 The soil body electrically responds determinator under lightning impulse effect
CN103389742A (en) * 2013-07-29 2013-11-13 国家电网公司 Grounding simulation test positioning system and positioning method thereof
CN103424652A (en) * 2013-07-30 2013-12-04 中国电力科学研究院 Impact performance simulation test method and device for grounding body with large simulated size and large amplitude value
CN105929274A (en) * 2016-05-03 2016-09-07 国网江西省电力科学研究院 Apparatus and method for impact current test of dimension adjustable grounding module
CN106597114A (en) * 2016-11-28 2017-04-26 国家电网公司 Simulated grounding test system and method for grounding material
CN108020739A (en) * 2017-11-29 2018-05-11 中国南方电网有限责任公司超高压输电公司广州局 A kind of method for reducing deep well grounding electrode maximum current density

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