CN104931793B - A kind of grounding net of transformer substation impedance ground acquisition methods - Google Patents
A kind of grounding net of transformer substation impedance ground acquisition methods Download PDFInfo
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- CN104931793B CN104931793B CN201510315723.5A CN201510315723A CN104931793B CN 104931793 B CN104931793 B CN 104931793B CN 201510315723 A CN201510315723 A CN 201510315723A CN 104931793 B CN104931793 B CN 104931793B
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Abstract
The present invention relates to a kind of grounding net of transformer substation impedance ground acquisition methods, comprise the following steps：1) live dash current generation module produces dash current and acts on the online input grounding downlead of substation grounding；2) dash current, the transient response voltage waveform signal of input grounding downlead caused by module occur for down conductor transient current and voltage logging modle, collection site dash current；3) electric current and voltage waveform data that TT＆C system computing module is provided down conductor transient current and voltage logging modle are handled to obtain the Transient grounding resistance of grounded screen, power-frequency earthing impedance, grounding resistance and reactance value, are as a result stored in test result storage and logging modle.Compared with prior art, the present invention has the advantages that simple, accurate and not limited by live service condition.
Description
Technical field
The present invention relates to grounding net of transformer substation monitoring technology, is obtained more particularly, to a kind of grounding net of transformer substation impedance ground
Method.
Background technology
Grounding net of transformer substation is to ensure that electrical equipment and the critical facility of personal safety.Currently used power frequency earthing resistance
Obtained impedance ground value is tested for 50Hz or close to the power-frequency earthing impedance value under 50Hz, but generation is short actually in transformer station
Under road earth fault, or Lightning Incoming Wave or operation ripple effect, the transient state Transient grounding resistance of grounded screen plays a decisive role.Cause
This only measure power-frequency earthing impedance can not represent grounding net of transformer substation can be with safe operation under fault condition.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of grounding net of transformer substation
Impedance ground acquisition methods.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of grounding net of transformer substation impedance ground acquisition methods, it is characterised in that comprise the following steps：
1) module occur for live dash current produce dash current to act under the online input grounding of substation grounding draws
Line；
2) down conductor transient current and voltage logging modle, collection site dash current occur to impact caused by module
The transient response voltage waveform signal of electric current, input grounding downlead；
3) electric current and voltage that TT＆C system computing module is provided down conductor transient current and voltage logging modle
Wave data is handled to obtain the Transient grounding resistance of grounded screen, power-frequency earthing impedance, grounding resistance and reactance value, is as a result deposited
It is stored in test result storage and logging modle.
It is impulse current generator that module, which occurs, for described live dash current, described down conductor transient current and
Voltage logging modle is transient-wave recorder.
Described TT＆C system computing module and test result storage are embedded in observing and controlling analysis with logging modle and shown flat
On platform.
Described Transient grounding resistance ZcjIt is calculated as follows：
Wherein n is pendulous frequency；Max is to take peak value；Iin_GFor the standard impulse current waveform sequence of down conductor G inputs
Row, common m points, amplitude A；Uout_GFor the transient state High Voltage Impulse Waveform sequence of down conductor G outputs, common m points, amplitude V.
Described power-frequency earthing impedance Zgp：
Wherein, n is pendulous frequency；FFT50HzFor the modulus value to taking 50Hz components after signal progress Fast Fourier Transform (FFT)；
Iin_GFor the standard impulse current wave sequence of down conductor G inputs, common m points, amplitude A；Uout_GExported for down conductor G
Transient state High Voltage Impulse Waveform sequence, common m points, amplitude V.
Described grounding resistance R and reactance L：
Take for the first time measurement obtain electric current, waveform voltage signal FFT corresponds to angular frequency and isWhen computing impedance value be Z1,
Second of measurement is taken to obtain electric current, waveform voltage signal FFT corresponds to angular frequency and isComputing impedance value be Z2, wherein k is
Nonzero integer, byThen
Compared with prior art, the present invention obtains the impedance of grounded screen power-frequency earthing, Transient grounding resistance, grounding resistance simultaneously
And reactance, it can understand the running status of grounded screen in the case where not having a power failure and earth mat not being excavated, judge whether grounded screen is sent out
Raw corrosion, ensures the safe and reliable operation of power system；And have simple, accurate and do not limited by live service condition
Advantage.
Brief description of the drawings
Fig. 1 is the high-level schematic functional block diagram of the present invention；
Fig. 2 is flow chart of the method for the present invention；
Fig. 3 is the on-the-spot test wiring diagram of the present invention；
Fig. 4 is the on-the-spot test dash current of the present invention, voltage oscillogram.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
Power-frequency earthing impedance, Transient grounding resistance, grounding resistance and the reactance of grounded screen can be obtained simultaneously by the present invention,
Live impulse current generator outputting standard impulse current waveform is used, puts on evaluated grounding net of transformer substation, is measured
The dash current and transient response voltage waveform signal of chosen input grounding downlead, punching is based on using the software of TT＆C system
The algorithm of impedance ground, the impedance ground algorithm of 50Hz power frequencies and resistance-reactance separation algorithm are hit, respectively obtains the grounded screen
Power-frequency earthing impedance, Transient grounding resistance, grounding resistance and reactance.
The concrete outcome of the present invention can refer to accompanying drawing, and Fig. 1 is one kind of a preferred embodiment of the present invention while is grounded
The impedance of net power-frequency earthing, Transient grounding resistance, the acquisition methods main modular block diagram of grounding resistance and reactance.The transformer station connects
Mesh grounding impedance acquisition methods comprise at least：Module 10, down conductor transient current and voltage occur for live dash current
Logging modle 11, TT＆C system computing module 12, test result storage and record (the inquiry of historical data) module 13.Between module
Connecting relation：Module 10 occur for live dash current produce dash current to act under the online input grounding of substation grounding draws
Line, down conductor transient current occur to impact caused by module 10 with the collection site dash current of voltage logging modle module 11
The transient response voltage waveform signal of electric current, input grounding downlead, TT＆C system computing module 12 is to down conductor transient state
The electric current and voltage waveform data that electric current and voltage logging modle 11 provide handled to obtain the Transient grounding resistance of grounded screen,
Power-frequency earthing impedance, grounding resistance and reactance value, test result storage and record (the inquiry of historical data) mould 13 are as a result stored in,
It is easy to the inquiry of historical data and contrast.
The live impulse current generator 8/20 μ s standard impulse currents of generation of the present invention act on grounding net of transformer substation and connect
On ground downlead, and the shock response voltage of input dash current and down conductor is recorded, carry out data processing and calculate to divide
Analysis, obtains Transient grounding resistance, power-frequency earthing impedance, grounding resistance and the reactance value of grounded screen.
As shown in Fig. 2 acquisition methods that are a kind of while obtaining the impedance of grounded screen power-frequency earthing and Transient grounding resistance, including
Following steps：
Step 1, into transformer station, grounding net of transformer substation testing impedance point is selected, and put according to grounded screen catercorner length
Voltage, testing current line；
Step 2, live impulse current generator, transient-wave recorder are connected, and is connected to measuring-controlling and analyzing system and shows
Show platform；
Step 3, test record (at least 2 times) and calculated and analyzed, obtain Transient grounding resistance, the power frequency of grounded screen
Impedance ground, grounding resistance and reactance value；
Step 4, store to database.
Field conduct case explanation
As shown in figure 3, into a 110kV transformer stations, it is grounded screen testing impedance to select transformer station 1# main transformers earthing bar
Point G, p-wire 200m afield voltage pole, electric current are pressed according to DL/T475-2006 electric discharges according to grounded screen catercorner length 50m
P-wire 250m afield electric current poles.Connecting live dash current transmitting apparatus, (the μ s of outputting standard current waveform 8/20, peak value are more than
10A), shock response waveform voltage line is connected to multi-channel transient wave tracer (sample rate is arranged to 100MS/s).Test note
Record (at least 2 times) is simultaneously calculated and analyzed, obtain the Transient grounding resistance of grounded screen, power-frequency earthing impedance, grounding resistance and
Reactance value.Wherein, Transient grounding resistance is calculated, shock response curve is drawn and coefficient correlation is calculated and is defined as below respectively.
(1) Transient grounding resistance Zcj：
Note：N --- pendulous frequency, generally 2 times；
Max --- take peak value；
Iin_G--- the standard impulse current wave sequence of down conductor G inputs, common m points, amplitude A；
Uout_G--- the transient state High Voltage Impulse Waveform sequence of down conductor G outputs, common m points, amplitude V.
(2) power-frequency earthing impedance Zgp：
Note：N --- pendulous frequency, generally 2 times；
FFT50Hz--- the modulus value to taking 50Hz components after signal progress Fast Fourier Transform (FFT)；
Iin_G--- the standard impulse current wave sequence of down conductor G inputs, common m points, amplitude A；
Uout_G--- the transient state High Voltage Impulse Waveform sequence of down conductor G outputs, common m points, amplitude V.
(3) grounding resistance R and reactance L：
The first measurement is taken to obtain electric current, waveform voltage signal FFT corresponds to angular frequency and isWhen computing impedance value be Z1, take
Second measurement obtains electric current, waveform voltage signal FFT corresponds to angular frequency and isThe computing impedance value of (k is nonzero integer) is Z2。
ByThen
Module, 2) selection of shock response output head grounding downlead are occurred with regard to 1) live dash current and 3) tests and remembers
Recording device, two links do following explanation：
1) module occurs for live dash current
The present invention based on live dash current module occurs, it is recommended to use 8/20 μ s normalized current ripples, but can also make
With non-standard dash current ripples such as 1/20 μ s, 4/10 μ s, 30/80 μ s, peak value size can also change in addition.
2) selection of shock response output head grounding downlead
The selection position of the shock response output head grounding downlead of foregoing description can change, and choose number and also may be used
With change.
3) test and tape deck
Module, transient-wave register instrument and observing and controlling analysis and display platform, which occur, for dash current to convert, i.e.,
It is optionally combined or master dresses up all-in-one.
Claims (4)
1. a kind of grounding net of transformer substation impedance ground acquisition methods, it is characterised in that comprise the following steps：
1) live dash current generation module produces dash current and acts on the online input grounding downlead of substation grounding；
2) impact electricity caused by module occurs for down conductor transient current and voltage logging modle, collection site dash current
Stream, the transient response voltage waveform signal of input grounding downlead；
3) electric current and voltage waveform that TT＆C system computing module is provided down conductor transient current and voltage logging modle
Data are handled to obtain the Transient grounding resistance of grounded screen, power-frequency earthing impedance, grounding resistance and reactance value, are as a result stored in
Test result stores and logging modle；
Described power-frequency earthing impedance Zgp：
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Wherein, n is pendulous frequency；FFT50HzFor the modulus value to taking 50Hz components after signal progress Fast Fourier Transform (FFT)；Iin_GFor
The standard impulse current wave sequence of down conductor G inputs, common m points, amplitude A；Uout_GFor the transient state of down conductor G outputs
High Voltage Impulse Waveform sequence, common m points, amplitude V；
Described grounding resistance R and reactance L：
Take for the first time measurement obtain electric current, waveform voltage signal FFT corresponds to angular frequency and isWhen computing impedance value be Z1, take
Double measurement obtains electric current, waveform voltage signal FFT corresponds to angular frequency and isComputing impedance value be Z2, wherein k is that non-zero is whole
Number, byThen
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2. a kind of grounding net of transformer substation impedance ground acquisition methods according to claim 1, it is characterised in that described shows
It is impulse current generator that module, which occurs, for field dash current, and described down conductor transient current and voltage logging modle are temporary
State wave tracer.
A kind of 3. grounding net of transformer substation impedance ground acquisition methods according to claim 1, it is characterised in that described survey
Control system-computed module and test result storage are embedded in observing and controlling analysis and display platform with logging modle.
4. a kind of grounding net of transformer substation impedance ground acquisition methods according to claim 1, it is characterised in that described rushes
Hit impedance ground ZcjIt is calculated as follows：
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| CN108318764A (en) * | 2018-03-28 | 2018-07-24 | 国网上海市电力公司 | A kind of earthing or grounding means shock response test jamproof system and method |
| CN108548962A (en) * | 2018-04-13 | 2018-09-18 | 国网上海市电力公司 | A kind of grounded screen alternating current and direct current and impulse resistance integrated test system and method |
| CN108445297A (en) * | 2018-04-18 | 2018-08-24 | 中国石油天然气集团有限公司 | The monitoring method and system of Resistance of Grounding Grids |
| CN110202254A (en) * | 2019-06-21 | 2019-09-06 | 国网河南省电力公司方城县供电公司 | A kind of welding method of grounding net of transformer substation connector |
| CN111880010B (en) * | 2020-08-10 | 2021-11-09 | 西南交通大学 | Method for detecting impact effective length of grounding electrode of power transmission line tower |
| CN112595938B (en) * | 2020-12-03 | 2023-08-22 | 河南四达电力设备股份有限公司 | Method for evaluating adaptability of graphite-based flexible grounding device of pole tower of overhead transmission line |
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| US7720619B2 (en) * | 2006-08-04 | 2010-05-18 | Schweitzer Engineering Laboratories, Inc. | Systems and methods for detecting high-impedance faults in a multi-grounded power distribution system |
| CN102928673B (en) * | 2012-10-25 | 2015-04-22 | 清华大学 | Method for acquiring impulse grounding resistance |
| CN103852695B (en) * | 2014-03-05 | 2017-02-08 | 中国科学院电工研究所 | Grounding grid state detection method based on high-frequency impulse reverse-scattering imaging |
| CN104535842B (en) * | 2015-01-04 | 2017-05-17 | 云南电网有限责任公司电力科学研究院 | Converter station grounding grid surge impedance testing method based on artificial short-circuit test |
| CN104678246B (en) * | 2015-02-03 | 2017-10-27 | 国网上海市电力公司 | A kind of grounding net of transformer substation etch state appraisal procedure and its system |
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