CN107656144A - A kind of comprehensive detection system and method for transmission line of electricity earthed system - Google Patents
A kind of comprehensive detection system and method for transmission line of electricity earthed system Download PDFInfo
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- CN107656144A CN107656144A CN201711125195.2A CN201711125195A CN107656144A CN 107656144 A CN107656144 A CN 107656144A CN 201711125195 A CN201711125195 A CN 201711125195A CN 107656144 A CN107656144 A CN 107656144A
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Classifications
-
- 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
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
Abstract
Description
Technical field
The present invention relates to power system earthing detection technical field, specifically a kind of transmission line of electricity earthed system it is comprehensive Close detecting system and method.
Background technology
In the last few years, lightning stroke trip was constantly in first of all kinds of failures.Earthed system is to improve the resistance to thunder of transmission line of electricity A horizontal basic measures, but do not paid attention to currently for the research of transmission line of electricity earthed system.Not yet carry out and be directed to The earthed system of transmission line of electricity carries out holistic approach, more lacks the overall merit and detection method of transmission line of electricity lightning protection properties.
At present, earthing or grounding means (overhead ground wire, down conductor and grounding body etc.) is to improve the transmission line of electricity water of resistance to thunder A flat basic measures.And grounding resistance is to check the sole indicator whether earthing or grounding means reaches regulatory requirements.Therefore, pass through The feasible method of science, grounding resistance is accurately measured, for ensureing that transmission line of electricity lightning protection properties are particularly important.With It is several existing typical ground resistance measurement methods down：
Method one：Three electrode method
Low-frequency ac electric current I caused by hand generator, the voltage U between grounding body and voltage pole is measured, according to ohm Law R=U/I, calculate the grounding resistance of tested grounding body.But this method, which has measurement every time, will make a call to two auxiliarily The shortcomings that pole.Labor intensity is added, many scenes can not even beat auxiliary earth polar；This method can not find to be present in draw under The positions such as line, each connection are because the situation of corrosion or loose contact.
Method two：Split-core type meter method
Split-core type meter method is the improvement to traditional ground resistance measurement method, as long as being clamped with split-core type meter under overhead line structures grounding lead Line, with regard to grounding resistance can be surveyed.But the result for clamping meter method for measuring can introduce certain original reason error.Influence factor includes：Connect Ground form, lightning conducter form, lightning-arrest line length, measurement frequency.Secondly, it is not suitable for the shaft tower of more downlead earthing types.
In order to which solve antitheft and down conductor is reliably connected problem, the bolt of partial earthing line connecting plate is all changed to Directly weld, and the mode of this welding earth stud makes the measurement of three electrode method and split-core type meter method run into very big difficulty.
Patent such as entitled release-free electric cable tower ground resistance measuring method and its device (Patent No. 96120774.4) carries A kind of method gone out, its object is to provide one kind to untie electric tower down conductor and electric tower tie point, you can measure electricity The method for fast measuring and device of tower ground resistance.This method is that pincerlike transformer is vised more with down conductor, the ground resistance of survey Value, although realizing the function of exempting to solve line, set environment for electric pylon and have higher requirements：It is more inclined for residing region Far, and the higher more dangerously steep electric tower of physical features, operating personnel can not directly measure, and be not easy to carry out the electric tower of manual measurement more Easily there is the hidden danger that hits a mine, suitable emphasis monitoring excludes hidden danger.
Also the two of shaft tower left and right ends are connected on respectively using four pairs of voltage transformer summation current transformers using split-core type meter method On bar lightning protection line, voltage signal is sensed to lightning protection line, collection measurement current signal by voltage transformer and simultaneously put by filtering It is big to wait signal transacting link, the relation of feedback current and induced voltage is obtained, eventually through specific computational methods, is tested The grounding resistance resistance of shaft tower.Although this method overcomes tester in existing method of Testing Earth-Contact Resistance to reach test Scene and the problem of must the unnecessary downlead of shaft tower be untied, but hang over due to pincers voltage transformer and electric current on lightning protection line Presence gap between transformer and lightning protection line, measuring environment is larger by natural environment influence, causes to deposit between one group of measured value In relative error.
The content of the invention
In view of the shortcomings of the prior art, the present invention proposes comprehensive detection system and the side of a kind of transmission line of electricity earthed system Method, its can the relevant Lightning-Protected Grounding of Transmission Line performance of comprehensive detection, provided safeguard for the safe operation of power network.
The present invention solves its technical problem and adopted the technical scheme that：
On the one hand, a kind of comprehensive detection system of transmission line of electricity earthed system provided in an embodiment of the present invention includes ground connection electricity Hinder test device and eight annular voltage transformers being connected respectively with earth resistance device and eight ring currents are mutual Sensor, described eight annular voltage transformers and eight ring current transformers are separately positioned on four down conductors of shaft tower And on the overhead ground wire of shaft tower left and right ends, and annular voltage transformer and ring current transformer in pairs and are disposed adjacent； The annular voltage transformer being arranged on the overhead ground wire of shaft tower left and right ends is used to apply voltage on overhead ground wire, if The voltage signal for putting annular voltage transformer collection four down conductors of shaft tower on four down conductors of shaft tower is concurrent Earth resistance device is given, the ring current transformer gathers four down conductors of shaft tower and shaft tower or so two respectively Eight groups of current signals of the overhead ground wire at end are simultaneously sent to earth resistance device, and the earth resistance device is to eight Group voltage signal and current signal be calculated the contact resistance resistance of tested shaft tower transmission line of electricity earthed system.
As a kind of possible implementation of the present embodiment, the earth resistance device includes MCU, mould occurs for signal Block, the first Current Voltage modular converter, signal amplification module, signal selection module, power amplifier module, the second Current Voltage turn Change the mold block, filtration module, range handover module, AC-DC conversion module, the first AD conversion module, display module, GPRS module, Second AD conversion module and power module, the MCU is successively by signal generating module, the first Current Voltage modular converter, letter Number amplification module, signal selection module and power amplifier module and the annular being arranged on the overhead ground wire of shaft tower left and right ends Voltage transformer is connected, and eight ring current transformers are successively by the second Current Voltage modular converter, filtration module, amount Journey handover module, AC-DC conversion module and the first AD conversion module are connected with MCU, described to be arranged under four grounding leads of shaft tower Annular voltage transformer on line is connected by the second AD conversion module with MCU, and the power module fills for earth resistance Offer stable operating voltage is provided；
Wherein, the MCU control signals generation module sends sinusoidal ac signal and by the first Current Voltage modulus of conversion Block, the output of signal amplification module determine the sinusoidal ac signal of magnitude of voltage, then by signal selection module by different magnitudes of voltage Distribute to overhead ground wire Shang No. tetra- voltage transformers for being arranged on shaft tower left and right ends and export in branch road, while put by power The load driving force of big module raising circuit is arranged on the roads of overhead ground wire Shang tetra- electricity of shaft tower left and right ends so as to drive Press transformer；When overhead ground wire Shang No. tetra- voltage transformers by being arranged on shaft tower left and right ends are sensed to shaft tower or so two On the overhead ground wire at end during voltage signal, electric current should be produced in tested loop, by eight ring current transformers respectively by eight Road current signal detects, and is converted to magnitude of voltage by the second Current Voltage modular converter, then is filtered by filtration module, root Range is selected by range handover module according to measured size, then DC quantity is converted to by AC-DC conversion module and measures it Size, be converted to digital quantity by the first AD conversion module and be sent into MCU, meanwhile, it is arranged on four down conductors of shaft tower The voltage signal of annular voltage transformer collection four down conductors of shaft tower is simultaneously converted to numeral by the second AD conversion module Amount is sent into MCU；MCU is carried out tested shaft tower transmission line of electricity earthed system is calculated and connect to eight groups of voltage signals and current signal Point resistance is simultaneously shown by display module and sent by GPRS module to the host computer of remote monitoring center.
As a kind of possible implementation of the present embodiment, the earth resistance device also includes serial port module, institute State serial port module and be used for adjusting parameter and program.
As a kind of possible implementation of the present embodiment, the earth resistance device also includes clock module, institute Clock module is stated to be used to determine system time.
As a kind of possible implementation of the present embodiment, the earth resistance device also includes memory module, institute Memory module is stated to be used to store the related data and grounding resistance measurement result during earth resistance.
On the other hand, the method for comprehensive detection of a kind of transmission line of electricity earthed system provided in an embodiment of the present invention, in utilization State described comprehensive detection system to test the contact resistance of transmission line of electricity earthed system, detailed process includes following step Suddenly：
Step 1, eight pairs of voltage transformer summation current transformers are separately mounted to two lightning conducters of shaft tower left and right ends On upper and down conductor, and it is attached with earth resistance device；
Step 2, earth resistance device is mutual to four voltages on two lightning protection lines of shaft tower left and right ends Sensor sends sine voltage signal, and this alternating voltage is sensed to lightning conducter；
Step 3, eight current transformers sense to obtain the electric current in lightning conducter and down conductor and are sent into grounding resistance Test device；
Step 4, second is carried out after certain interval of time to test, four voltage transformers on down conductor Sensing obtains the voltage in voltage transformer and is sent into earth resistance device, at the same time, eight current transformer sensings Obtain the electric current in lightning conducter and down conductor and be sent into earth resistance device；
Step 5, earth resistance device according to sensing to four voltage signals on lightning conducter and collection voltage and Current signal carries out that grounding resistance resistance is calculated.
As a kind of possible implementation of the present embodiment, the detailed process of the step 2 is：MCU control signals occur Module sends sinusoidal ac signal and is determining magnitude of voltage just by the first Current Voltage modular converter, the output of signal amplification module String AC signal, then distributed different magnitudes of voltage to two lightning protection installed in shaft tower left and right ends by signal selection module In four voltage transformers output branch road on line, while the load driving force of circuit is improved so as to driving by power amplifier module Dynamic four voltage transformers on two lightning protection lines of shaft tower left and right ends sense alternating voltage to corresponding lightning-arrest On line.
As a kind of possible implementation of the present embodiment, eight current transformers sense to obtain lightning conducter and ground connection Electric current in downlead is simultaneously sent into the detailed process of earth resistance device and is：Eight current transformers are respectively by eight road electric currents Signal detection goes out, and is converted to magnitude of voltage by the second Current Voltage modular converter, then is filtered by filtration module, according to tested Measure size and range selected by range handover module, then DC quantity is converted to by AC-DC conversion module and measures its size, Digital quantity, which is converted to, by the first AD conversion module is sent into MCU.
As a kind of possible implementation of the present embodiment, four voltage transformers on down conductor Sensing obtains the voltage in voltage transformer and is sent into the detailed process of earth resistance device：Installed in down conductor On four voltage transformers collection down conductor voltage signal and be converted to digital quantity by the second AD conversion module and give Enter MCU.
As a kind of possible implementation of the present embodiment, in steps of 5, the specific mistake of grounding resistance resistance is calculated Cheng Wei：
If RegFor tested pole tower ground resistance impedance value, ZLFor all shaft tower parallel equivalent resistance impedance values in left side, ZRFor All shaft tower parallel equivalent resistance impedance values in right side, Z1And Z2It is respectively tested two aerial between shaft tower and left side first order shaft tower Lightning conducter equivalent resistance impedance value, Z3And Z4Respectively tested two overhead ground wires between shaft tower and right side first order shaft tower are equivalent Resistive impedance value, Z5、Z6、Z7、Z8Respectively four down conductor equivalent resistances, ZegFor four down conductor parallel connections etc. Imitate resistance；
When measure for the first time, pass through voltage transformer pt1~PT4The voltage applied on to lightning conducter is,The current data of eight current transformer measurements is simultaneously Produced to be measured using current transformer in corresponding overhead ground wire branch road Raw electric current, can obtain following matrix equation：
Wherein, unknown number has Z1、Z2、Z3、Z4、ZL、ZR、Reg、ZegTotally 8；
When carrying out second of measurement, pass through voltage transformer pt5~PT8The voltage of measurement is At the same time, corresponded to using 4 overhead ground wires 4 and down conductor of current transformer measurement current generated in branch road For：
By I5Z5=I6Z6=I7Z7=I8Z8(4 down conductor resistor coupled in parallel)：
And Zeg=Z5//Z6//Z7//Z8
Simultaneous Equations (1) and (2) are understood：
Unknown number has Z1、Z2、Z3、Z4、ZL、ZR、Reg、Z5Totally 8, and meeting
Under conditions of, solution of equations presence is simultaneously unique；
Solve equation group and obtain circuit parameter Reg。
The technical scheme of the embodiment of the present invention can have the advantage that as follows：
On the one hand, technical scheme of the embodiment of the present invention divides eight annular voltage transformers and eight ring current transformers It is not arranged on four down conductors of shaft tower and the overhead ground wire of shaft tower left and right ends, and annular voltage transformer and annular Current transformer is paired and is disposed adjacent；The annular voltage transformer being arranged on the overhead ground wire of shaft tower left and right ends is used for Apply voltage on to overhead ground wire, annular voltage transformer four, the shaft tower of collection being arranged on four down conductors of shaft tower The voltage signal of down conductor is simultaneously sent to earth resistance device, and the ring current transformer gathers shaft tower four respectively Eight groups of current signals of bar down conductor and the overhead ground wire of shaft tower left and right ends are simultaneously sent to earth resistance device, The earth resistance device carries out that tested shaft tower transmission line of electricity ground connection is calculated to eight groups of voltage signals and current signal The contact resistance resistance of system.Using four down conductors of shaft tower and overhead ground wire simultaneously as measurement point, using multigroup mutual Sensor measures, for comprehensive detection tower body and grounding body resistance.
On the one hand, eight pairs of voltage transformer summation current transformers are separately mounted to by technical scheme of the embodiment of the present invention first On two lightning conducters of shaft tower left and right ends and on down conductor, and it is attached with earth resistance device；Next connects Ground resistance test device sends sinusoidal voltage to four voltage transformers on two lightning protection lines of shaft tower left and right ends Signal, and this alternating voltage is sensed to lightning conducter；Then eight current transformers sense to obtain under lightning conducter and grounding lead Electric current in line is simultaneously sent into earth resistance device；Furthermore carry out testing for second after certain interval of time, installed in ground connection Four voltage transformers on downlead sense to obtain the voltage in voltage transformer and are sent into earth resistance device, with this Meanwhile eight current transformers sense to obtain the electric current in lightning conducter and down conductor and are sent into earth resistance device； Last earth resistance device enters according to the voltage and current signal of sensing to four voltage signals on lightning conducter and collection Grounding resistance resistance is calculated in row.Using four down conductors of shaft tower and overhead ground wire simultaneously as measurement point, using more The method of group transformer measurement, for comprehensive detection tower body and grounding body resistance.
Technical scheme of the embodiment of the present invention realizes the function that remotely can quickly measure tower body and grounding body resistance, significantly Reduce tester and carry out the workload of field survey, and this device achieves that exempt to tear function open, without untiing unnecessary draw Offline (shaft tower containing any a plurality of downlead), substantially increases monitoring efficiency.In addition, technical scheme of the embodiment of the present invention is also The function of overhead ground wire and the dual measurement of down conductor is realized, has been ensured in the case of one group of equipment failure, normally Monitor shaft tower lightning protection properties.Every group of transformer measurable downlead or overhead ground wire resistance when working independently, from algorithm to the greatest extent Calculation error may be reduced, and avoid the error of transformer link as far as possible.The data of measurement are stored, establish transmission line of electricity lightning protection System comprehensive management platform, establish lightning protection early warning expert system.
Brief description of the drawings
Fig. 1 is a kind of signal of the comprehensive detection system of transmission line of electricity earthed system according to an exemplary embodiment Figure；
Fig. 2 is a kind of specific installation signal of voltage transformer summation current transformer according to an exemplary embodiment Figure；
Fig. 3 is a kind of schematic diagram of earth resistance device according to an exemplary embodiment；
Fig. 4 is a kind of flow of the method for comprehensive detection of transmission line of electricity earthed system according to an exemplary embodiment Figure；
Fig. 5 is a kind of schematic diagram of grounding resistance measurement equivalent circuit according to an exemplary embodiment.
Embodiment
For the technical characterstic for illustrating this programme can be understood, below by embodiment, and its accompanying drawing is combined, to this hair It is bright to be described in detail.Following disclosure provides many different embodiments or example is used for realizing the different knots of the present invention Structure.In order to simplify disclosure of the invention, hereinafter the part and setting of specific examples are described.In addition, the present invention can be with Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated Relation between various embodiments are discussed and/or set.It should be noted that part illustrated in the accompanying drawings is not necessarily to scale Draw.Present invention omits the description to known assemblies and treatment technology and process to avoid being unnecessarily limiting the present invention.
Fig. 1 is a kind of signal of the comprehensive detection system of transmission line of electricity earthed system according to an exemplary embodiment Figure.As depicted in figs. 1 and 2, a kind of comprehensive detection system of transmission line of electricity earthed system provided in an embodiment of the present invention includes connecing Ground resistance test device 1 and eight annular voltage transformers 2 (2-1 and 2-2) being connected respectively with earth resistance device With eight ring current transformers 3, described eight annular voltage transformers and eight ring current transformers are separately positioned on On four down conductors 6 of shaft tower 4 and the overhead ground wire 5 of the left and right ends of shaft tower 4, and annular voltage transformer and annular electro Current transformer is paired and is disposed adjacent；The annular voltage transformer PT1- being arranged on the overhead ground wire of the left and right ends of shaft tower 4 PT4 is used to apply voltage on overhead ground wire, the annular voltage transformer PT5- being arranged on four down conductors of shaft tower The voltage signal of PT8 collection four down conductors of shaft tower is simultaneously sent to earth resistance device, the ring current mutual inductance Device CT1-CT8 gathers eight groups of current signals of four down conductors of shaft tower and the overhead ground wire of shaft tower left and right ends simultaneously respectively Earth resistance device is sent to, the earth resistance device to eight groups of voltage signals and current signal calculate To the contact resistance resistance of tested shaft tower transmission line of electricity earthed system.
Using four down conductors of shaft tower and overhead ground wire simultaneously as measurement point, surveyed using multigroup transformer Amount, for comprehensive detection tower body and grounding body resistance.
In a kind of possible implementation, as shown in figure 3, the earth resistance device includes MCU, signal occurs Module, the first Current Voltage modular converter, signal amplification module, signal selection module, power amplifier module, the second Current Voltage Modular converter, filtration module, range handover module, AC-DC conversion module, the first AD conversion module, display module, GPRS moulds Block, the second AD conversion module and power module, the MCU successively by signal generating module, the first Current Voltage modular converter, Signal amplification module, signal selection module and power amplifier module are respectively with being arranged on the overhead ground wire of shaft tower left and right ends Annular voltage transformer PT1-PT4 be connected, eight ring current transformer CT1-CT8 pass through the second electric current successively respectively Voltage transformation module, filtration module, range handover module, AC-DC conversion module and the first AD conversion module are connected with MCU, institute State the annular voltage transformer PT5-PT8 being arranged on four down conductors of shaft tower respectively by the second AD conversion module with MCU is connected, and the power module provides stable operating voltage for earth resistance device；
Wherein, the MCU control signals generation module sends sinusoidal ac signal and by the first Current Voltage modulus of conversion Block, the output of signal amplification module determine the sinusoidal ac signal of magnitude of voltage, then by signal selection module by different magnitudes of voltage Distribute to overhead ground wire Shang No. tetra- voltage transformers for being arranged on shaft tower left and right ends and export in branch road, while put by power The load driving force of big module raising circuit is arranged on the roads of overhead ground wire Shang tetra- electricity of shaft tower left and right ends so as to drive Press transformer；When overhead ground wire Shang No. tetra- voltage transformers by being arranged on shaft tower left and right ends are sensed to shaft tower or so two On the overhead ground wire at end during voltage signal, electric current should be produced in tested loop, by eight ring current transformers respectively by eight Road current signal detects, and is converted to magnitude of voltage by the second Current Voltage modular converter, then is filtered by filtration module, root Range is selected by range handover module according to measured size, then DC quantity is converted to by AC-DC conversion module and measures it Size, be converted to digital quantity by the first AD conversion module and be sent into MCU, meanwhile, it is arranged on four down conductors of shaft tower The voltage signal of annular voltage transformer collection four down conductors of shaft tower is simultaneously converted to numeral by the second AD conversion module Amount is sent into MCU；MCU is carried out tested shaft tower transmission line of electricity earthed system is calculated and connect to eight groups of voltage signals and current signal Point resistance is simultaneously shown by display module and sent by GPRS module to the host computer of remote monitoring center.
In a kind of possible implementation, the earth resistance device also includes serial port module, the serial ports mould Block is used for adjusting parameter and program.
In a kind of possible implementation, the earth resistance device also includes clock module, the clock mould Block is used to determine system time.
In a kind of possible implementation, the earth resistance device also includes memory module, the storage mould Block is used to store the related data and grounding resistance measurement result during earth resistance.
The present embodiment realizes the function that remotely can quickly measure tower body and grounding body resistance, greatly reduces tester Member carries out the workload of field survey, and this device achieves that exempts to tear function open, without untiing unnecessary downlead (containing any The shaft tower of a plurality of downlead), substantially increase monitoring efficiency.In addition, this implementation is also achieved under overhead ground wire and grounding lead The function of the dual measurement of line, ensure in the case of one group of equipment failure, it is normal to monitor shaft tower lightning protection properties.Every group of transformer Measurable downlead or overhead ground wire resistance, reduces calculation error, and keep away as far as possible as far as possible from algorithm when working independently Exempt from the error of transformer link.The data of measurement are stored, transmission line of electricity lightning-protection system comprehensive management platform is established, it is pre- to establish lightning protection Alert expert system, provides safeguard for the safe operation of power network.
Fig. 4 is a kind of flow of the method for comprehensive detection of transmission line of electricity earthed system according to an exemplary embodiment Figure.As shown in figure 4, a kind of method for comprehensive detection of transmission line of electricity earthed system provided in an embodiment of the present invention, utilizes above-mentioned institute The comprehensive detection system stated is tested the contact resistance of transmission line of electricity earthed system, and detailed process comprises the following steps：
Step 1, eight pairs of voltage transformer summation current transformers are separately mounted to two lightning conducters of shaft tower left and right ends On upper and down conductor, and it is attached with earth resistance device；
Step 2, earth resistance device is mutual to four voltages on two lightning protection lines of shaft tower left and right ends Sensor sends sine voltage signal, and this alternating voltage is sensed to lightning conducter；
Step 3, eight current transformers sense to obtain the electric current in lightning conducter and down conductor and are sent into grounding resistance Test device；
Step 4, second is carried out after certain interval of time to test, four voltage transformers on down conductor Sensing obtains the voltage in voltage transformer and is sent into earth resistance device, at the same time, eight current transformer sensings Obtain the electric current in lightning conducter and down conductor and be sent into earth resistance device；
Step 5, earth resistance device according to sensing to four voltage signals on lightning conducter and collection voltage and Current signal carries out that grounding resistance resistance is calculated.
After calculating grounding resistance resistance, earth resistance device is simultaneously stored related data and by showing mould Block shows and sent by GPRS module to the host computer of remote monitoring center.
In a kind of possible implementation, the detailed process of the step 2 is：MCU control signals occur module and sent Sinusoidal ac signal simultaneously determines that the simple alternating current of magnitude of voltage is believed by the first Current Voltage modular converter, the output of signal amplification module Number, then distributed different magnitudes of voltage to four on two lightning protection lines of shaft tower left and right ends by signal selection module In individual voltage transformer output branch road, while the load driving force of circuit is improved so as to which drive installation exists by power amplifier module Four voltage transformers on two lightning protection lines of shaft tower left and right ends sense alternating voltage to corresponding lightning conducter.
In a kind of possible implementation, eight current transformers sense to obtain in lightning conducter and down conductor Electric current and be sent into the detailed process of earth resistance device and be：Eight current transformers are respectively by eight road current signal detections Go out, and magnitude of voltage is converted to by the second Current Voltage modular converter, then filtered by filtration module, led to according to measured size Range handover module selection range is crossed, then DC quantity is converted to by AC-DC conversion module and measures its size, by first AD conversion module is converted to digital quantity and is sent into MCU.
In a kind of possible implementation, four voltage transformers on down conductor sense to obtain Voltage in voltage transformer is simultaneously sent into the detailed process of earth resistance device and is：Four on down conductor The voltage signal of voltage transformer collection down conductor is simultaneously converted to digital quantity feeding MCU by the second AD conversion module.
In a kind of possible implementation, in steps of 5, the detailed process that grounding resistance resistance is calculated is：
If RegFor tested pole tower ground resistance impedance value, ZLFor all shaft tower parallel equivalent resistance impedance values in left side, ZRFor All shaft tower parallel equivalent resistance impedance values in right side, Z1And Z2It is respectively tested two aerial between shaft tower and left side first order shaft tower Lightning conducter equivalent resistance impedance value, Z3And Z4Respectively tested two overhead ground wires between shaft tower and right side first order shaft tower are equivalent Resistive impedance value, Z5、Z6、Z7、Z8Respectively four down conductor equivalent resistances, ZegFor four down conductor parallel connections etc. Imitate resistance；As shown in Figure 5.
When measure for the first time, pass through voltage transformer pt1~PT4The voltage applied on to lightning conducter is,The current data of eight current transformer measurements is simultaneously Produced to be measured using current transformer in corresponding overhead ground wire branch road Raw electric current, can obtain following matrix equation：
Wherein, unknown number has Z1、Z2、Z3、Z4、ZL、ZR、Reg、ZegTotally 8；
When carrying out second of measurement, pass through voltage transformer pt5~PT8The voltage of measurement is At the same time, corresponded to using 4 overhead ground wires 4 and down conductor of current transformer measurement current generated in branch road For：
By I5Z5=I6Z6=I7Z7=I8Z8(4 down conductor resistor coupled in parallel, therefore I5Z5=I6Z6=I7Z7=I8Z8) ：
And Zeg=Z5//Z6//Z7//Z8
Simultaneous Equations (1) and (2) are understood：
Unknown number has Z1、Z2、Z3、Z4、ZL、ZR、Reg、Z5Totally 8, and meeting
Under conditions of, solution of equations exists and is unique；
Solve equation group and obtain circuit parameter Reg。
The present embodiment realizes the function that remotely can quickly measure tower body and grounding body resistance, greatly reduces tester Member carries out the workload of field survey, and this device achieves that exempts to tear function open, without untiing unnecessary downlead (containing any The shaft tower of a plurality of downlead), substantially increase monitoring efficiency.In addition, this implementation is also achieved under overhead ground wire and grounding lead The function of the dual measurement of line, ensure in the case of one group of equipment failure, it is normal to monitor shaft tower lightning protection properties.Every group of transformer Measurable downlead or overhead ground wire resistance, reduces calculation error, and keep away as far as possible as far as possible from algorithm when working independently Exempt from the error of transformer link.The data of measurement are stored, transmission line of electricity lightning-protection system comprehensive management platform is established, it is pre- to establish lightning protection Alert expert system, provides safeguard for the safe operation of power network.
The present invention using eight couples of voltage transformer pt summation current transformer CT be connected on respectively two of shaft tower left and right ends it is anti- On thunder line and on down conductor, sensed by voltage transformer to tested one specific voltage signal of shaft tower, while by electric current The transformer measurement now electric current in lightning conducter and its down conductor, and voltage is converted to by Current Voltage modular converter Value, then filtered by filtration module, range is selected by range handover module according to measured size, then pass through AC-DC conversion Module is converted to DC quantity and measures its size, by AD conversion module be converted to digital quantity be sent into MCU units, obtain voltage with The relation of electric current, eventually through specific computational methods, the grounding resistance resistance of tested shaft tower is obtained, the program need not consider bar Tower ground lead quantity, it is applicable to the shaft tower containing any a plurality of downlead.Evaluation system passes through the contrast to two groups of data And analysis, it is ensured that the precision of tested resistance.Consider to greatest extent and remove electromagnetic interference mistake existing for single overhead ground wire measurement point Difference and the error caused by voltage (electric current) transformer has contact gap.Consider to greatest extent and remove single down conductor Measurement point is because ground environment is severe, the larger caused error of Hz noise.
Simply the preferred embodiment of the present invention described above, for those skilled in the art, Without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also regarded as this hair Bright protection domain.
Claims (10)
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