CN108646085A - A kind of earth mat shunting relating rule system and test method based on mobile network - Google Patents
A kind of earth mat shunting relating rule system and test method based on mobile network Download PDFInfo
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- CN108646085A CN108646085A CN201810466669.8A CN201810466669A CN108646085A CN 108646085 A CN108646085 A CN 108646085A CN 201810466669 A CN201810466669 A CN 201810466669A CN 108646085 A CN108646085 A CN 108646085A
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- 239000002184 metal Substances 0.000 abstract description 6
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to a kind of earth mat shunting relating rule system and test method based on mobile network, completion substation metal frame, cable metal oversheath cause the shunting phasor of error influence to the test of earth mat characterisitic parameter and test, to obtain the earth mat diverting coefficient of substation.The earth mat diverting coefficient can be used in the earth mats characterisitic parameters such as the impedance ground to substation, step voltage, contact voltage and Potential distribution and be modified, and the earth mat shunting relating rule system of the present invention based on mobile network includes experiment power supply, isolating transformer, main computer unit and shunting relating rule unit.
Description
Technical field
The present invention relates to substation's large ground network metal frames and cable metal oversheath to be grounded, and tests ground grid parameter
The technical field of measurement and test of shunt influence, specifically a kind of earth mat shunting relating rule system and test side based on mobile network
Method.
Background technology
Earth mat diverting coefficient refers to the ratio of the fault current and short dot total failare electric current that flow through grounding net of transformer substation, is
Substation grounding resistance is designed, the important parameter that must take into consideration when ground potential liter, step voltage and contact voltage is calculated.In order to drop
The overhead transmission line of low land net diverting coefficient, substation's connection should all set up the good lightning conducter of electric conductivity and and power transformation
The grounded screen stood is reliably connected, and tower grounding step by step, reduces the 8-10 base shaft tower ground resistances close to substation emphatically, to increase
The separation capacity of big lightning conducter；The cable run of substation's connection, 10kV system cable metallic jackets both ends all should be reliable
Ground connection, 35kV and above system cable metallic jacket answer one end to be grounded, and return wire are completely laid, to increase cable
Metallic jacket separation capacity reduces earth mat and enters ground short circuit electric current, and in the case where condition is permitted, earth mat diverting coefficient can reach
To 30%.
Large-scale substation (current conversion station) grounded screen area coverage of the system of extra-high voltage AC and DC transmission of electricity is big, complicated,
It to meet the requirement of power grid reliability service, needs to minimize earth mat and enters earth fault electric current, increase overhead power transmission lightning conducter and electricity
The circulation of the separation capacities such as cable metallic jacket, large-scale framework is increasingly complex, and electromagnetic environment is harsher, accurate to carry out earth mat point
It is more difficult to flow coefficient measurement.And it carries out being difficult to unlock all points when grounded screen characterisitic parameter measures according to method as defined in standard
Flow path is to eliminate its influence so that impedance ground, step voltage, contact voltage and Potential distribution of measurement etc. are less than practical
Value, causes great systematic error, influences power grid reliability service.
The substation built is completed, earth mat diverting coefficient should be measured, verification earth mat fault current distribution calculates, and is that power grid can
It is provided by operation and more accurately calculates data basis.Meanwhile parameter is shunted according to earth mat, method as defined in existing standard is carried out
The earth mats characterisitic parameters such as obtained impedance ground, step voltage, contact voltage and Potential distribution are measured to be modified.
Invention content
The present invention relates to a kind of earth mat shunting relating rule system and test method based on mobile network, to earth mat characteristic
Parameter testing causes the shunting phasor that error influences and is tested, these shunting phasors are by flowing through several substation's metal structures
Frame, the phasor of cable metal oversheath and composition.To obtain the earth mat diverting coefficient of substation.The earth mat diverting coefficient can be used
It is modified in the earth mats characterisitic parameter such as the impedance ground of substation, step voltage, contact voltage and Potential distribution.
It is of the present invention based on mobile network earth mat shunting relating rule system include experiment power supply, isolating transformer,
Main computer unit and shunting relating rule unit；
The experiment power supply is connect with isolating transformer primary side winding, and the one of terminal of isolating transformer vice-side winding connects
Distant place current electrode lead is connect, another terminal connects grounded screen Current injection points in substation；
Main computer unit include the first CPU and the GPS module being connect respectively with the first CPU, mobile network data transmission module,
A/D conversion modules further include the first current sensor being connect with A/D conversion modules, to the total current of testing experiment power supply；
Shunt relating rule unit, including the 2nd CPU and the GPS module, the mobile network data that are connect respectively with the 2nd CPU
Transmission module, A/D conversion modules further include the second current sensor being connect with A/D conversion modules, to test strange land shunting
The electric current of point；
Between the main computer unit and shunting relating rule unit by its internal mobile network data transmission module into
Row data exchange；The GPS module provides time data and pulse per second (PPS) edge for main computer unit and shunting relating rule unit.
Signal-regulated kinase is further respectively had in the main computer unit and shunting relating rule unit, the letter in main computer unit
Number conditioning module is connected between the first current sensor and A/D conversion modules, shunts the signal condition in relating rule unit
Module is connected between the second current sensor and A/D conversion modules.
Earth mat shunting relating rule method of the present invention based on mobile network includes the following steps：
(1) it requires arrangement to measure current electrode lead according to standard, is tested using alien frequencies of the experiment power supply output not less than 3A
Signal injects grounded screen by isolating transformer, and signal code enters ground lead by grounded screen main body and framework and enters ground, from remote
Square current electrode lead returns；
(2) the first CPU send the test command of shunting phasor to the 2nd CPU by mobile network data transmission module and divide
It is carved at the beginning of stream relating rule；
(3) the first CPU and the 2nd CPU receive respective time data and pulse per second (PPS) edge by GPS module respectively, to of about
Fixed test start time, the first CPU and the 2nd CPU are respectively started respective A/D conversion portions using pulse per second (PPS) edge and start simultaneously at
Acquisition；
(4) after the completion of data acquisition, the first CPU and the 2nd CPU carry out data analysis and process and obtain respective electricity respectively
Flow amplitude and phase information；
(5) the first CPU receive the amplitude and phase of the shunt current phasor of the 2nd CPU by mobile network data transmission module
Position information, and be compared respectively with the current amplitude of the first CPU and phase information, obtain the amplitude and phase of diverting coefficient.
The advantageous effect of above-mentioned test system and test method is：
1, it can be accurately detected the shunting phasor current signal of each split point, high sensitivity is power grid construction and operation
Accurately and reliably data basis is provided；
2, parameter can be shunted according to the earth mat tested, is connect to what method as defined in existing standard measured
The earth mats characterisitic parameter such as ground impedance, step voltage, contact voltage and Potential distribution is modified.
3, the data at both ends can be ensured to main computer unit and shunting relating rule unit sync identification using GPS module
Initial time precise synchronization is acquired, precision is better than 100ns.
4, using mobile network data transmission module, by mobile data network, it can be achieved that main computer unit and shunting phasor
The test in unit strange land and data transmission, are not limited by distance and region.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Specific implementation mode
Below in conjunction with attached drawing detailed description of the present invention embodiment.
As shown in Figure 1, the technical solution of the earth mat shunting relating rule system based on mobile network described in the present embodiment
Including experiment power supply 1, isolating transformer 2, main computer unit 13 and shunting relating rule unit 14.
The experiment power supply 1 is connect with the primary side winding of isolating transformer 2, the vice-side winding wherein one of isolating transformer 2
Terminal accesses distant place current electrode lead 3, and another terminal meets grounded screen Current injection points A in substation；
The main computer unit 13 includes the first CPU11 and the mobile network data being connect respectively with the first CPU11 transmission mould
Block 7, GPS module 8, A/D conversion modules 6, the Signal-regulated kinase 5 being connect with A/D conversion modules 6 connect with Signal-regulated kinase 5
The first current sensor 9 connect；
The shunting relating rule unit 14 includes the 2nd CPU12 and the mobile network's number being connect respectively with the 2nd CPU12
According to transmission module 7, GPS module 8, A/D conversion modules 6, the Signal-regulated kinase 5 being connect with A/D conversion modules 6, with signal tune
Manage the second current sensor 10 that module 5 connects；
First current sensor 9 passes through total electricity of 2 output injection earth mat A points of isolating transformer to testing experiment power supply 1
Stream；
Second current sensor 10, to test strange land split point B, C, D, F for entering the ground shunting of lead 4 by framework etc.
Electric current；
Mobile network data transmission module 7, to carry out main computer unit 13 and shunt the number between relating rule unit 14
According to exchange；
GPS module 8 is that main computer unit 13 and shunting relating rule unit 14 provide time data and pulse per second (PPS) edge.
Following detailed description is using above-mentioned technical proposal to the survey calculation step of earth mat diverting coefficient：
As shown in Figure 1, require arrangement to measure current electrode lead according to standard, it is different not less than 3A using experiment power supply output
Frequency test signal (40~60Hz of frequency does not include 49Hz, 50Hz, 51Hz), by isolating transformer, injects grounded screen from A points,
Signal code enters ground lead (B, C, D, E are the split point that framework enters ground lead) by grounded screen main body and framework and enters ground, from remote
Square current electrode lead returns.
First, the first CPU of main computer unit by mobile network data transmission module to the of shunting relating rule unit
Two CPU are carved at the beginning of sending the test command for shunting phasor and test；Then, the first CPU and the 2nd CPU pass through GPS respectively
Module receives respective time data and pulse per second (PPS) edge, and precision is better than 100ns；
Using the first current sensor of main computer unit, in Current injection points A, the total current into ground is detectedUse shunting
Second current sensor of relating rule unit detects each point of electric current in strange land split point B, C, D, E ... successively respectivelyN is natural number；Reach agreement test start time, the first CPU of main computer unit and point
2nd CPU of stream relating rule unit is respectively started respective A/D conversion modules using pulse per second (PPS) edge and starts simultaneously at acquisition；
After the completion of data acquisition, the first CPU of main computer unit and the 2nd CPU of shunting relating rule unit are respectively into line number
Respective current amplitude and phase information are obtained according to analysis and processing；
Finally, the first CPU of main computer unit receives shunting relating rule unit the by mobile network data transmission module
The amplitude and phase information of the shunt current phasor of two CPU, and compared respectively with the current amplitude of the first CPU and phase information
Compared with obtaining the amplitude and phase of diverting coefficient.
In the above-described embodiments, GPS module provides time data for test system and starts pulse per second (PPS), ensures the first electric current
The test initial time of sensor and the second current sensor is identical, realizes synchronous detection, can effectively ensure that test data
Precision reduces data processing error.
In the above-described embodiments, mobile network data transmission module utilizes mobile data network, exchanges the first CPU and second
Data between CPU realize main computer unit and shunt the remote-site testing of relating rule unit, do not limited by distance and region.
In the above-described embodiments, Signal-regulated kinase completes data programming amplifying, filtering, impedance in data transmission procedure
Transformation.
The calculating process after the earth mat shunting relating rule systematic survey based on mobile network is described below：
Calculate grounded screen earth current
WhereinFor each split point electric current phasor summation.
Calculate earth mat diverting coefficient
In formula (2),For each shunt current synchronism detection moment and total current ratio.
Above-mentioned calculating process is illustrated with a specific example below：
Using experiment power supply by isolating transformer, 3A, 45Hz simple sinusoidal alternating current are injected in earth mat A points.
It is detected into ground total current in A points using the first current sensor of main computer unitUse shunting relating rule unit
The second current sensor B points detect shunt currentFrom main computer unit by mobile network data transmission module to shunting
Relating rule unit is carved at the beginning of sending test command and test, after being completed, passes through shifting by shunting relating rule unit
Test data is transmitted to main computer unit by dynamic network data transmission module.
Measuring ratio of the B point shunt currents at synchronism detection moment and total current is：
According to above step, using the second current sensor of shunting relating rule unit, minute of C, D, E point is tested successively
Galvanic electricity stream
Measuring C point results is：
Measuring D point results is：
Measuring E point results is：
Calculate total shunting phasor accounting：
Calculate earth mat diverting coefficient
In the above-described embodiments, experiment power supply tests power supply using self-control POWER10 earth mats, and 0-800V, 40-65Hz can
It adjusts, isolating transformer improves amplification module YDX201, AD conversion using self-control YDTR10, Signal-regulated kinase using program control signal
Device use 16 6 channel AD7656, mobile network data transmission module use ZSD3410, GPS module use GPS-15X, first
Current sensor uses forcipated mutual-inductor KEW8148, and the second current sensor is using flexible Luo-coil ME005-2700, and first
CPU uses TMS320F2812, the 2nd CPU to use TMS320F2812.
It these are only the preferred embodiment of the present invention, be not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of earth mat based on mobile network shunts relating rule system, it is characterised in that：Including experiment power supply, isolation transformation
Device, main computer unit and shunting relating rule unit；
The experiment power supply is connect with isolating transformer primary side winding, and the one of terminal connection of isolating transformer vice-side winding is remote
Square current electrode lead, another terminal connect grounded screen Current injection points in substation；
Main computer unit includes the first CPU and the GPS module being connect respectively with the first CPU, mobile network data transmission module, A/D
Conversion module further includes the first current sensor being connect with A/D conversion modules, to the total current of testing experiment power supply；
Shunt relating rule unit, including the 2nd CPU and connect respectively with the 2nd CPU GPS module, mobile network data transmit
Module, A/D conversion modules further include the second current sensor being connect with A/D conversion modules, to test strange land split point
Electric current；
By its internal mobile network data transmission module into line number between the main computer unit and shunting relating rule unit
According to exchange；The GPS module provides time data and pulse per second (PPS) edge for main computer unit and shunting relating rule unit.
2. earth mat according to claim 1 shunts relating rule system, it is characterised in that：The main computer unit and shunting phase
Signal-regulated kinase is further respectively had in amount test cell, the Signal-regulated kinase in main computer unit is connected to the first current sense
Between device and A/D conversion modules, the Signal-regulated kinase shunted in relating rule unit is connected to the second current sensor and A/D
Between conversion module.
3. a kind of earth mat shunting relating rule system with earth mat described in claim 2 shunts relating rule method, feature
It is to include the following steps：
(1) it requires arrangement to measure current electrode lead according to standard, the alien frequencies test signal of 3A is not less than using experiment power supply output,
By isolating transformer, grounded screen is injected, signal code enters ground lead by grounded screen main body and framework and enters ground, from distant place electric current
Pole lead returns；
(2) the first CPU send the test command and shunting phase of shunting phasor by mobile network data transmission module to the 2nd CPU
It is carved at the beginning of measuring examination；
(3) the first CPU and the 2nd CPU receive respective time data and pulse per second (PPS) edge by GPS module respectively, reach agreement
Test start time, the first CPU and the 2nd CPU are respectively started respective A/D conversion portions using pulse per second (PPS) edge and start simultaneously at acquisition；
(4) after the completion of data acquisition, the first CPU and the 2nd CPU carry out data analysis and process and obtain respective electric current width respectively
Value and phase information；
(5) the first CPU receive the amplitude of the shunt current phasor of the 2nd CPU by mobile network data transmission module and phase is believed
Breath, and be compared respectively with the current amplitude of the first CPU and phase information, obtain the amplitude and phase of diverting coefficient.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112782610A (en) * | 2019-11-11 | 2021-05-11 | 国网天津市电力公司 | Grounding grid performance detection method and system based on wireless sensor network |
| CN117849446A (en) * | 2024-03-07 | 2024-04-09 | 国网山东省电力公司莱芜供电公司 | Transformer substation ground current detection system, method, electronic equipment and medium |
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Patent Citations (5)
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| CN103197133A (en) * | 2013-03-26 | 2013-07-10 | 广东电网公司电力科学研究院 | Large earth screen shunt vector quantity measurement method based on wireless transmission |
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| CN112782610A (en) * | 2019-11-11 | 2021-05-11 | 国网天津市电力公司 | Grounding grid performance detection method and system based on wireless sensor network |
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