CN108008198A - A kind of impulse earthed resistance measuring method of meter and earth mat temperature - Google Patents
A kind of impulse earthed resistance measuring method of meter and earth mat temperature Download PDFInfo
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- CN108008198A CN108008198A CN201711252173.2A CN201711252173A CN108008198A CN 108008198 A CN108008198 A CN 108008198A CN 201711252173 A CN201711252173 A CN 201711252173A CN 108008198 A CN108008198 A CN 108008198A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
Abstract
The present invention provides the impulse earthed resistance measuring method of a kind of meter and earth mat temperature, and each step of this method is respectively：1) shaft tower earth mat Research on Automatic Measuring System of Temperature is built according to field conditions, 2) the tested grounded screen environment temperature distribution situation of reconnaissance detection, 3) data of each measurement point are calculated to overall impulse earthed resistance weighing factor, 4) according to test point temperature data, shaft tower earth mat is calculated and is considering earth mat temperature Ground shock waves ground resistance.The present invention according to actual condition, can the limited accurate situation that meter and earth mat temperature Ground shock waves ground resistance is calculated, can effectively judge shaft tower by circuit operating status when being struck by lightning by the calculating to impulse earthed resistance；Test platform be easy to arrangement, it is easy and effective, suitable for various operating modes.
Description
Technical field
The present invention relates to electric system lightning protection and ground connection field, more particularly, to the impact of a kind of meter and earth mat temperature
Ground resistance measurement method.
Background technology
The safe operation of shaft tower and its lightning protection characteristic relation are close in transmission system, and its lightning protection effect will be directly by it
The impact characteristics of earthing or grounding means influence.During the shaft tower that is struck by lightning, lightning current is spilt into ground by shaft tower and its earthing or grounding means, and
In this transient process, a certain size voltage drop must be formed on impulse earthed resistance.If this voltage is more than transmission line of electricity electricity
Pressure, hits back circuit, serious threat power plant and substation equipment, and will increase line tripping rate, influences electrical stability.
Thus, it is a currently domestic and international great research topic, and a great problem to reduce impulse earthed resistance to a certain extent.
Existing research finds that the change of grounded screen and its neighbouring temperature has directly system earth impulse earthed resistance
Influence., just can be preferably in different weather, varying environment if dynamic grasps impulse earthed resistance value during temperature change
Lower optimization earthing or grounding means in time, reduces the incidence of counterattack accident.The present invention can promote power grid efficiently to construct, and promote intelligence electricity
Net fast construction, while the present invention monitors shaft tower environment temperature in real time, real-time place can be realized to data close to intelligent monitoring
Reason, and relevant computational methods and calculation formula are drawn by a large number of experiments before, emulation and corresponding theory deduction, can be accurate
Impulse earthed resistance is really calculated in real time, and necessary data and reliable are provided for further protection configuration and drop resistance research
Reference.
The content of the invention
The present invention provides the impulse earthed resistance measuring method of a kind of meter accurate in real time and earth mat temperature.
In order to reach above-mentioned technique effect, technical scheme is as follows：
The impulse earthed resistance measuring method of a kind of meter and earth mat temperature, comprises the following steps：
S1：Live pilot investigation；
S2：Choose measurement point and assemble combined experimental device；
S3：The region division and weight distribution of measurement point；
S4：Signal processor carries out parameters revision；
S5：Impulse earthed resistance is calculated.
Further, the process of the step S1 is：
Grounded screen related physical quantity is measured, measuring shaft tower, nearby soil resistivity is ρ, and grounded screen sectional area is
S1, four skirt of grounded screen into rectangular area be S2, grounded screen buried depth is H, and grounded screen longest edge length is L1, and thunder and lightning punching
It is I to hit electric currentm。
Further, the process of the step S2 is：
Nine measurement points are taken in whole grounded screen, and wherein four angles of grounded screen are chosen for 1 respectively, 2,3,4 points；In grounded screen
Lower section is chosen at 5,6 points；Grounded screen right and left is chosen at 7,8 points；Center is chosen at 9 points, and temperature sensor is placed horizontally at
0.8H under soil, each sensor measure the corresponding temperature, and temperature acquisition mould is passed to by signal transmssion line after signal acquisition
Block, carries out Macro or mass analysis in the device, can respectively obtain the real time temperature x of nine pointsi, wherein i=0,1,9,
For temperature collecting module by coaxial cable by each temperature input signal analysis processor, signal processor passes through coaxial electrical again
Cable is connected to terminal upper computer.
Further, the process of the step S3 is：
The temperature performance and change in resistance of measurement point 1,2,3,4 are considered as identical in allowable range of error；Measurement point 5,
6 be considered as in allowable range of error it is identical；Measurement point 7,8 is considered as identical；9 points are solely a measurement point；1,2,3,4 points account for entirety jointly
Resistance weight is：
5,6 points jointly shared weight be：
7,8 points jointly shared weight be：
Weight shared by 9 points is：
w4=-1.826*S2 0.196+log(S2+S2 0.5+6.704)。
Further, the process of the step S4 is：
The correction factor that lightning current is calculated is：
Grounded screen Area modificatory coefficient is：
Soil resistivity correction factor is：
Further, the process of the step S5 is：
Order：
Then impulse earthed resistance is：
Compared with prior art, the beneficial effect of technical solution of the present invention is：
The present invention discloses the impulse earthed resistance measuring method of a kind of meter and earth mat temperature, and each step of this method is respectively：
1) shaft tower earth mat Research on Automatic Measuring System of Temperature is built according to field conditions, 2) the tested grounded screen environment temperature distribution situation of reconnaissance detection,
3) data of each measurement point are calculated to overall impulse earthed resistance weighing factor, 4) according to test point temperature data, meter
Calculation obtains shaft tower earth mat and is considering earth mat temperature Ground shock waves ground resistance.The present invention, being capable of limited accurate meter according to actual condition
Calculation is counted and the situation of earth mat temperature Ground shock waves ground resistance, can effectively judge shaft tower by the calculating to impulse earthed resistance
By circuit operating status when being struck by lightning；Test platform be easy to arrangement, it is easy and effective, suitable for various operating modes.
Brief description of the drawings
Fig. 1 is the method for the present invention flow chart；
Fig. 2 is earth mat information and moisture measurement point distribution map in the present invention；
The system that Fig. 3 is carried by the method for the present invention.
Embodiment
Attached drawing is only for illustration, it is impossible to is interpreted as the limitation to this patent；
In order to more preferably illustrate the present embodiment, some components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be appreciated that some known features and its explanation, which may be omitted, in attached drawing
's.
Technical scheme is described further with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, the impulse earthed resistance measuring method of a kind of meter and earth mat temperature, comprises the following steps：
The first step：Live pilot investigation
It is H=0.8m, grounded screen longest edge length L that grounded screen, which is chosen, away from ground depth1For 20m, grounded screen sectional area S1For
25*πmm2Four skirt of grounded screen into rectangular area S2For 100m2, lightning impulse current ImFor 70kA region as test section
Domain, the regional soil resistivity are that ρ is 150 (Ω .m-1)。
Second step：Choose measurement point and assemble combined experimental device
Nine measurement points are taken in whole grounded screen, and wherein four angles of grounded screen are chosen for 1 respectively, 2,3,4 points；In grounded screen
Lower section is chosen at 5,6 points；Grounded screen right and left is chosen at 7,8 points；Center is chosen at 9 points.Temperature sensor is placed horizontally at
Under soil under 0.8H, each sensor measures the corresponding temperature, and temperature acquisition is passed to by signal transmssion line after signal acquisition
Module 10, carries out Macro or mass analysis in the device, can respectively obtain the real-time temperature values of nine points, is respectively x1=30 DEG C, x2=
32 DEG C, x3=31 DEG C, x4=31 DEG C, x5=30 DEG C, x6=31 DEG C, x7=30 DEG C, x8=32 DEG C, x9=31 DEG C, temperature acquisition mould
By coaxial cable 13 by each temperature input signal analysis processor 11, signal processor is connected block by coaxial cable 14 again
It is connected to terminal upper computer.
3rd step：The region division and weight distribution of measurement point
The temperature performance and change in resistance of measurement point 1,2,3,4 can be considered identical in allowable range of error；Measurement point
5,6 can be considered identical in allowable range of error；Measurement point 7,8 can be considered identical in allowable range of error；9 points are solely a measurement
Point.
1,2,3,4 points account for overall electrical resistance weight and are jointly：
5,6 points jointly shared weight be：
7,8 points jointly shared weight be：
Weight shared by 9 points is：
w4=-1.826*S2 0.196+log(S2+S2 0.5+6.704)；
4th step：Signal processor carries out parameters revision
The correction factor of lightning current is：
Grounded screen Area modificatory coefficient is：
Soil resistivity correction factor is：
5th step：Impulse earthed resistance is calculated
The data needed according to being obtained in host computer：k1, k2, k3, the temperature value (T of each measurement point1=30 DEG C, T2=32
DEG C, T3=31 DEG C, T4=31 DEG C, T5=30 DEG C, T6=31 DEG C, T7=30 DEG C, T8=32 DEG C, T9=31 DEG C), and four regions
Weight w1, w2, w3, w4,
According to the following formula：
Impulse earthed resistance R is calculatedch=10.569 Ω.
The same or similar label correspond to the same or similar components；
Position relationship is used for only for illustration described in attached drawing, it is impossible to is interpreted as the limitation to this patent；
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (6)
1. the impulse earthed resistance measuring method of a kind of meter and earth mat temperature, it is characterised in that comprise the following steps：
S1：Live pilot investigation；
S2：Choose measurement point and assemble combined experimental device；
S3：The region division and weight distribution of measurement point；
S4：Signal processor carries out parameters revision；
S5：Impulse earthed resistance is calculated.
2. the impulse earthed resistance measuring method of meter according to claim 1 and earth mat temperature, it is characterised in that the step
Suddenly the process of S1 is：
Grounded screen related physical quantity is measured, measuring shaft tower, nearby soil resistivity is ρ, and grounded screen sectional area is S1, ground connection
Four skirt of net into rectangular area be S2, grounded screen buried depth is H, and grounded screen longest edge length is L1, and lightning impulse current is
Im。
3. the impulse earthed resistance measuring method of meter according to claim 2 and earth mat temperature, it is characterised in that the step
Suddenly the process of S2 is：
Nine measurement points are taken in whole grounded screen, and wherein four angles of grounded screen are chosen for 1 respectively, 2,3,4 points；Grounded screen upper and lower
It is chosen at 5,6 points；Grounded screen right and left is chosen at 7,8 points；Center is chosen at 9 points, and temperature sensor is placed horizontally in soil
Lower 0.8H, each sensor measure the corresponding temperature, and temperature collecting module is passed to by signal transmssion line after signal acquisition,
The device carries out Macro or mass analysis, can respectively obtain the real time temperature x of nine pointsi, wherein i=0,1,9, temperature
By coaxial cable by each temperature input signal analysis processor, signal processor is connected acquisition module by coaxial cable again
It is connected to terminal upper computer.
4. the impulse earthed resistance measuring method of meter according to claim 3 and earth mat temperature, it is characterised in that the step
Suddenly the process of S3 is：
The temperature performance and change in resistance of measurement point 1,2,3,4 are considered as identical in allowable range of error；Measurement point 5,6 exists
Allowable range of error is considered as identical；Measurement point 7,8 is considered as identical；9 points are solely a measurement point；1,2,3,4 points account for overall electricity jointly
Hindering weight is：
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5,6 points jointly shared weight be：
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7,8 points jointly shared weight be：
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Weight shared by 9 points is：
w4=-1.826*S2 0.196+log(S2+S2 0.5+6.704)。
5. the impulse earthed resistance measuring method of meter according to claim 4 and earth mat temperature, it is characterised in that the step
Suddenly the process of S4 is：
The correction factor that lightning current is calculated is：
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Grounded screen Area modificatory coefficient is：
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Soil resistivity correction factor is：
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6. the impulse earthed resistance measuring method of meter according to claim 5 and earth mat temperature, it is characterised in that the step
Suddenly the process of S5 is：
Order：
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Then impulse earthed resistance is：
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872709A (en) * | 2018-08-13 | 2018-11-23 | 西南交通大学 | A kind of different moisture content lower leaf soil dynamic electric resistor characteristic test method |
| CN109188088A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | A kind of vertical demixing electric resistance of soil nonlinear characteristic test method |
| CN109188090A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The nonlinear test method of different humidity electric resistance of soil in vertical demixing soil |
| CN109187653A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The Horizontal Layer Soil dynamic electric resistor characteristic test method of meter and different temperatures |
| CN109188092A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | Soil dynamic resistance characteristic test method under a kind of different temperatures |
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| CN109187653A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The Horizontal Layer Soil dynamic electric resistor characteristic test method of meter and different temperatures |
| CN109188092A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | Soil dynamic resistance characteristic test method under a kind of different temperatures |
| CN109187653B (en) * | 2018-08-13 | 2019-07-12 | 西南交通大学 | The Horizontal Layer Soil dynamic electric resistor characteristic test method of meter and different temperatures |
| CN109188090B (en) * | 2018-08-13 | 2019-11-05 | 西南交通大学 | The nonlinear test method of different humidity electric resistance of soil in vertical demixing soil |
| CN109188088B (en) * | 2018-08-13 | 2019-11-05 | 西南交通大学 | A kind of vertical demixing electric resistance of soil nonlinear characteristic test method |
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