CN104502724B - A kind of pole tower ground resistance measurement method - Google Patents
A kind of pole tower ground resistance measurement method Download PDFInfo
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- CN104502724B CN104502724B CN201410619014.1A CN201410619014A CN104502724B CN 104502724 B CN104502724 B CN 104502724B CN 201410619014 A CN201410619014 A CN 201410619014A CN 104502724 B CN104502724 B CN 104502724B
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Abstract
The invention discloses a kind of pole tower ground resistance measurement method, belong to electrical instrument field, when carrying out grounding resistance measurement using this method, self-inspection first is carried out to pincerlike meter, then measured using the pincerlike meter after self-inspection, pincerlike meter includes voltage transformer summation current transformer；Electric current self-inspection and voltage self-inspection are included to pincerlike meter self-inspection：The electric current self-inspection be using pincerlike meter inside AC constant-current source module produce the different current signal of multi gear amplitude and flow through first wire, utilize the size of current transformer measurement signal, obtain relation and the preservation of electric current actual value and measured value, the voltage self-inspection is to be sensed the different voltage signal of multi gear amplitude to tower grounding downlead and second wire using voltage transformer, obtains the relation of virtual voltage and induced voltage.Compared with prior art, by voltage self-inspection and electric current self-inspection, the measurement accuracy of voltage, electric current is improved, and then improves the precision of surveyed grounding resistance.
Description
Technical field
The present invention relates to electrical instrument field, a kind of pole tower ground resistance measurement method is particularly related to.
Background technology
Earth resistance tester is widely used in the measurement that electric power line pole tower is grounded performance in power domain.Wherein,
Pincerlike meter is the grounding resistance measurement equipment being most widely used.
The internal structure of pincerlike meter returns slowdown monitoring circuit by voltage transformer, current transformer, voltage generation circuit and electric current
Composition, its operation principle is as follows：Voltage generation circuit sends the sine wave of fixed frequency, and driving voltage transformer, and voltage is mutual
Sensor senses the voltage signal into tested electric power line pole tower, and now the earth-return circuit of transmission line of electricity will appear from electric current, then
Current signal sensing is returned using current transformer, and slowdown monitoring circuit processing is returned through overcurrent, the big of the current value can be obtained
Magnitude of voltage and the grounding resistance of the ratio, as electric power line pole tower that return between the current value surveyed small, sent.
The accuracy of above-mentioned pincerlike meter measurement pole tower ground resistance resistance depends on voltage transformer and sensed to shaft tower voltage
Precision and by current transformer return survey electric current precision.General pincerlike table function is fairly simple, is not improving
Furtherd investigate on the problem of above-mentioned two parts circuit precision.Because voltage, current measurement accuracy be not high, and measure resistance value and be
The ratio of voltage and electric current, so as to cause the resistance deviation of the resistance of the grounding resistance and reality measured larger.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of pole tower ground resistance measurement method, it can improve pincerlike meter
Electric current, voltage measurement accuracy, and then improve pincerlike meter measure pole tower ground resistance accuracy.
In order to solve the above technical problems, present invention offer technical scheme is as follows：
A kind of pole tower ground resistance measurement method, is first carried out self-inspection to pincerlike meter, is then entered using the pincerlike meter after self-inspection
Row measurement, wherein, the pincerlike meter includes voltage transformer summation current transformer；
It is described that electric current self-inspection and voltage self-inspection are included to pincerlike meter progress self-inspection：
The electric current self-inspection is：At the jaw that first wire is passed through to the current transformer, now, the electricity is closed
Transformer is pressed, producing the different current signal of multi gear amplitude using the AC constant-current source module inside pincerlike meter flows through described first
Root wire, the measured value of current signal is obtained using the current transformer, is produced by relatively more described AC constant-current source module
The size of current that measures of actual current and the current transformer, recycle interpolation method to obtain electric current actual value and measured value
Curved line relation, for the actual value of the calculating current size in follow-up measurement；
The voltage self-inspection is：By second wire through at the jaw of the voltage transformer, and keep described the
Two wire two ends open circuits, are sensed the different voltage signal of multi gear amplitude to tower grounding using the voltage transformer under drawing
Line and second wire, the voltage at second wire two ends is the voltage of tower grounding downlead, by comparing
The former end input voltage of voltage transformer and second wire both end voltage size are stated, recycles interpolation method to obtain voltage true
Value and the curved line relation of measured value, for calculating the actual value of voltage swing in follow-up measurement.
Further, first wire and second wire are same wires.
Further, the pincerlike meter includes MCU module, signal generator, bandpass filter and phase measurement module, institute
The control signal output for stating MCU module is connected with the signal input part of the signal generator, the signal generator it is defeated
Go out end with the input of the bandpass filter to be connected, the input and output end of the bandpass filter are surveyed with the phase
The input for measuring module is connected, and the output end of the phase measurement module accesses the data signal input of the MCU module；
It is described that self-inspection is carried out to pincerlike meter also including Selecting phasing self-inspection：
The Selecting phasing self-inspection is：Under the control of the MCU module, the signal generator transmitting certain frequency
Electric signal passes through the bandpass filter, the phase before and after the phase measurement module measurement filtering, and transmits to the MCU moulds
Block, goes out by the phase difference before and after the bandpass filter in the MCU module internal calculation,
If the phase difference is less than certain threshold value, using the signal of this frequency, otherwise, root during follow-up measurement of Grounding Resistance
According to phase is advanced or delayed different situations, change signal generator tranmitting frequency, until untill the phase difference meets requirement.
Further, the center frequency point frequency selected around in the Selecting phasing self-inspection in the bandpass filter is believed
Number.
The invention has the advantages that：
In actually measurement, first, at the jaw that current transformer is passed through by a wire, and the voltage is closed
Transformer, is produced using the AC constant-current source module inside pincerlike meter and measurement frequency identical signal and flows into the wire, profit
This signal is gathered with transformer, then, changes current amplitude size, surveys several groups of data more, obtain actually entering value and line electricity
The relation of influence value is pressed, for the actual value of the calculating current size in follow-up measurement, electric current self-inspection is realized；Then, one is passed through
The inc wire in root two ends, through at voltage transformer jaw, applies different voltage signals to voltage transformer, and detect
The voltage difference at wire two ends, obtains actually entering the relation of value and line voltage distribution influence value, for calculating electricity in follow-up measurement
The actual value of size is pressed, voltage self-inspection is realized；By electric current self-inspection and voltage self-inspection, the measurement accuracy of electric current, voltage is improved,
And then improve the precision of surveyed grounding resistance.
Brief description of the drawings
Fig. 1 is the flow chart of the pole tower ground resistance measurement method of the present invention；
The connection diagram of pincerlike meter when Fig. 2 is the pole tower ground resistance measurement method using the present invention；
Fig. 3 for the circuit part in the pole tower ground resistance measurement method of the present invention corresponding to Selecting phasing self-inspection structure
Schematic diagram.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
As shown in Figure 1-2, the present invention provides a kind of pole tower ground resistance measurement method, first carries out self-inspection to pincerlike meter 24,
Then measured using the pincerlike meter 24 after self-inspection, wherein, pincerlike meter 24 includes the summation current transformer 22 of voltage transformer 21；
Carrying out self-inspection to pincerlike meter 24 includes electric current self-inspection 11 and voltage self-inspection 12：
Electric current self-inspection 11 is：At the jaw that first wire is passed through to the current transformer 22, now, the electricity is closed
Transformer 21 is pressed, producing the different current signal of multi gear amplitude using the AC constant-current source module inside pincerlike meter 24 flows through first
Root wire, the measured value of current signal is obtained using current transformer 22, is produced by relatively more described AC constant-current source module
The size of current that actual current and the current transformer 22 are measured, recycles interpolation method to obtain electric current actual value and measured value
Curved line relation, for the actual value of the calculating current size in follow-up measurement.
Voltage self-inspection 2 is：At the jaw that second wire is passed through to voltage transformer 21, and keep second wire two
End open circuit, the different voltage signal of multi gear amplitude is sensed to tower grounding downlead and second lead using voltage transformer 21
Line, the voltage at second wire two ends is the voltage of tower grounding downlead, and electricity is inputted by the former end of comparison voltage transformer 21
Pressure and second wire both end voltage size, recycle interpolation method to obtain the curved line relation of voltage actual value and measured value, for
The actual value of voltage swing is calculated in follow-up measurement.
General, split-core type meter type earth resistance tester is measured using open type transformer, including voltage transformer 21
Faradic link is disconnected in summation current transformer 22, this open-core transformer, that is, sensing magnetic core is not one
Closed entirety, magnetic circuit efficiency is reduced at gap.Be difficult to accomplish laminating completely during due to measurement, thus in inductive effects and
Certain influence is had in precision, so as to produce measurement error.
Because the uniformity of voltage transformer 21 is poor and the difference of transformer core closure degree, even in voltage
The primary side of transformer 21 applies identical voltage, then the magnitude of voltage induced on the downlead of electric power line pole tower also has
Institute is different, and the voltage error can have a strong impact on the precision of powerline pole tower ground resistance measurement.
It is above-mentioned it is same due to and the environmental factor such as humiture influence, the data of the retaking of a year or grade of current transformer 22 are simultaneously
The situation of electric current in power transmission pole tower ground down lead can not accurately be reacted.
When being measured using method provided by the present invention, first, current transformer 22 is passed through by a wire
At jaw, and voltage transformer 21 is closed, produced using the AC constant-current source module inside pincerlike meter identical with measurement frequency
Signal and flow into the wire, gather this signal using transformer, then, change current amplitude size, survey several groups of data more, obtain
To the relation for actually entering value and line voltage distribution influence value, for the actual value of the calculating current size in follow-up measurement, realize
Electric current self-inspection 11；Then, by an inc wire in two ends, through at the jaw of voltage transformer 21, to voltage transformer
21 apply different voltage signals, and detect the voltage difference at wire two ends, obtain actually entering value and line voltage distribution influence value
Relation, for calculating the actual value of voltage swing in follow-up measurement, realizes voltage self-inspection 12；Pass through electric current self-inspection 11 and voltage
Self-inspection 12, improves the measurement accuracy of electric current, voltage, and then improves the precision of surveyed grounding resistance.In real work, first
Root wire and second wire are preferably same wire.
In addition, as shown in figure 3, pincerlike meter includes MCU module 31, signal generator 32, bandpass filter 33 and phase survey
Module 34 is measured, the control signal output of MCU module 31 is connected with the signal input part of signal generator 32, signal generator 32
Output end be connected with the input of bandpass filter 33, the input and output end of bandpass filter 33 with phase measurement mould
The input of block 34 is connected, and the output end of phase measurement module 34 accesses the data signal input of MCU module 31；
Electric power line pole tower earth-return circuit not purely resistive, if being directly grounded using the method measurement of voltage and current ratio
Resistance, it, which is sent between voltage and time survey electric current, has certain phase difference, if ignoring the index, actual measured value is
The impedance ground value rather than grounding resistance of electric power line pole tower, and the reality for influenceing electric power line pole tower to be grounded performance is shaft tower
Grounding resistance rather than impedance value.
So, as shown in figure 1, to make result more accurate, carrying out self-inspection to pincerlike meter also includes Selecting phasing self-inspection 13：
Selecting phasing self-inspection 3 is：Under the control of MCU module 31, signal generator 32 launches the electric signal of certain frequency
By bandpass filter 33, the phase before and after the measurement filtering of phase measurement module 34, and transmit to MCU module 31, in MCU module
31 internal calculations go out by the phase difference before and after bandpass filter 33, if the phase difference is less than certain threshold value, follow-up measurement
Using the signal of this frequency during grounding resistance, otherwise, according to phase is advanced or delayed different situations, changes signal generator 32 and send out
Radio frequency rate, untill the phase difference meets requirement.
Compared with prior art, generally band logical is used in signal transacting in the current earth resistance tester of pincerlike meter 24
Wave filter 33 obtains signal, because bandpass filter 33 is influenceed by factors such as environment, and its center frequency point filtered can also be sent out
Changing, if do not taken corresponding measure, one side measurement signal is possible to decay, and on the other hand can produce larger phase
Error, so as to produce more serious measurement error, the present invention uses phase filtering, it is to avoid environment causes in bandpass filter 33
The non-resistive influence to measurement result makes measurement result closer to actual electricity in itself for the skew of frequency of heart point and earth-return circuit
Resistance.
In order that Selecting phasing process of self-test carries out faster, it is preferentially selected around in the center frequency point of bandpass filter 33
Frequency signal..
Finally, next just can be with as shown in figure 1, when having carried out electric current self-inspection, voltage self-inspection, Selecting phasing self-inspection
Detection 14 is carried out to grounding resistance.
Beneficial effects of the present invention are as follows：
1st, it is first, mutual to voltage through voltage transformer by an inc wire in two ends in actually measurement
Sensor applies different voltage signals, obtains actually entering the relation of value and line voltage distribution influence value, realizes voltage self-inspection；So
Afterwards, pass through the AC constant-current source module generation inside current transformer, signal circuit identical with measurement frequency by a wire
Signal and flow into the wire and gather this signal using transformer, obtain actually entering the relation of value and line voltage distribution influence value,
Electric current self-inspection is realized, by voltage self-inspection and electric current self-inspection, voltage, the measurement accuracy of electric current is improved, and then improves and is surveyed
The precision of grounding resistance.
2nd, compared with prior art, the present invention uses phase filtering, it is to avoid environment causes bandpass filter centre frequency
The skew and the earth-return circuit non-resistive influence to measurement result in itself of point, make measurement result closer to actual resistance.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (2)
1. a kind of pole tower ground resistance measurement method, it is characterised in that first carry out self-inspection to pincerlike meter, then using self-inspection after
Pincerlike meter is measured, wherein, the pincerlike meter includes voltage transformer summation current transformer；
It is described that electric current self-inspection and voltage self-inspection are included to pincerlike meter progress self-inspection：
The electric current self-inspection is：At the jaw that first wire is passed through to the current transformer, now, the voltage is closed mutual
Sensor, flows through described first using the different current signal of the AC constant-current source module generation multi gear amplitude inside pincerlike meter and leads
Line, the measured value of current signal is obtained using the current transformer, the reality produced by relatively more described AC constant-current source module
The size of current that border electric current is measured with the current transformer, recycles interpolation method to obtain the curve of electric current actual value and measured value
Relation, for the actual value of the calculating current size in follow-up measurement；
The voltage self-inspection is：At the jaw that second wire is passed through to the voltage transformer, and kept for described second
Wire two ends are opened a way, the different voltage signal of multi gear amplitude sensed to tower grounding downlead using the voltage transformer and
Second wire, the voltage at second wire two ends is the voltage of tower grounding downlead, passes through relatively more described electricity
Press the former end input voltage of transformer and second wire both end voltage size, recycle interpolation method obtain voltage actual value with
The curved line relation of measured value, for calculating the actual value of voltage swing in follow-up measurement；
The pincerlike meter includes MCU module, signal generator, bandpass filter and phase measurement module, the control of the MCU module
Signal output part processed is connected with the signal input part of the signal generator, the output end of the signal generator and the band logical
The input of wave filter is connected, the input of the input and output end of the bandpass filter with the phase measurement module
It is connected, the output end of the phase measurement module accesses the data signal input of the MCU module；
It is described that self-inspection is carried out to pincerlike meter also including Selecting phasing self-inspection：
The Selecting phasing self-inspection is：Under the control of the MCU module, the signal generator launches the telecommunications of certain frequency
Number process bandpass filter, the phase before and after the phase measurement module measurement filtering, and transmit to the MCU module,
Go out in the MCU module internal calculation by the phase difference before and after the bandpass filter, if the phase difference is less than certain threshold
Value, then during follow-up measurement of Grounding Resistance using this frequency signal, otherwise, according to phase is advanced or delayed different situations, change
Signal generator tranmitting frequency, untill the phase difference meets requirement；
In the center frequency point frequency signal selected around of the bandpass filter in the Selecting phasing self-inspection.
2. a kind of pole tower ground resistance measurement method according to claim 1, it is characterised in that first wire and
Second wire is same wire.
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| CN105404343B (en) * | 2015-11-20 | 2017-08-29 | 国网山东省电力公司电力科学研究院 | A kind of AC constant-current source corrected suitable for current transformer |
| CN105467220A (en) * | 2015-11-20 | 2016-04-06 | 国网山东省电力公司电力科学研究院 | Portable grounding resistance tester |
| CN107782975B (en) * | 2017-09-19 | 2019-11-12 | 山东建筑大学 | Distributed grounding resistance detection system and detection method based on radio signal source |
| CN108490307A (en) * | 2018-07-06 | 2018-09-04 | 广东电网有限责任公司 | Grounding integrated device and grounding detection system |
| CN109900966A (en) * | 2019-02-15 | 2019-06-18 | 武汉市康达电气有限公司 | Transmission tower grounding impedance measuring system |
| CN113917235A (en) * | 2021-10-19 | 2022-01-11 | 广东电网有限责任公司广州供电局 | Resistance comprehensive measurement system based on intelligent current-voltage clamp meter |
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| EP0864873B1 (en) * | 1997-03-12 | 2003-11-19 | Siemens Aktiengesellschaft | Procedure for determining the grounding resistance and house wiring adapted for same |
| KR100734821B1 (en) * | 2005-10-31 | 2007-07-03 | 한국전력공사 | Measurement Method of Grounding Resistance of Transmission Towers in an Energized Transmission Line System |
| CN2896293Y (en) * | 2006-05-16 | 2007-05-02 | 符美安 | Pliers-shape earthing resistance instrument |
| CN101655544B (en) * | 2008-08-20 | 2012-07-25 | 国网电力科学研究院武汉南瑞有限责任公司 | Device for measuring and checking errors of digital mutual inductor |
| CN101413995B (en) * | 2008-11-28 | 2011-01-12 | 南瑞航天（北京）电气控制技术有限公司 | Apparatus for checking electronic type current mutual inductor |
| US8862648B2 (en) * | 2011-05-24 | 2014-10-14 | Taiwan Semiconductor Manufacturing Company, Ltd. | Fast filter calibration apparatus |
| CN102313879B (en) * | 2011-09-19 | 2014-09-17 | 贵州电力试验研究院 | Electronic current transformer on-line checking system based on double-clamp current coil |
| CN103278791B (en) * | 2013-05-10 | 2015-09-02 | 国家电网公司 | The electronic mutual inductor amplitude phase error check system that Networkable detects |
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