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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
mtd
mover
msub
mtr
centerdot
Prior art date
Application number
CN201711125195.2A
Other languages
Chinese (zh)
Inventor
刘洪正
袁海燕
姚金霞
辜超
师伟
李秀卫
李�杰
任敬国
王辉
郑建
王斌
孙艳迪
孙承海
张振军
孙景文
刘嵘
刘辉
庄燕飞
隋首钢
胡显哲
Original Assignee
国网山东省电力公司电力科学研究院
国家电网公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 国网山东省电力公司电力科学研究院, 国家电网公司 filed Critical 国网山东省电力公司电力科学研究院
Priority to CN201711125195.2A priority Critical patent/CN107656144A/en
Publication of CN107656144A publication Critical patent/CN107656144A/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G01R27/205Measuring contact resistance of connections, e.g. of earth connections

Abstract

The invention discloses a kind of comprehensive detection system and method for transmission line of electricity earthed system, eight pairs of voltage transformer summation current transformers are separately positioned on four down conductors of shaft tower and the overhead ground wire of shaft tower left and right ends by system, and in pairs and be disposed adjacent;The annular voltage transformer being arranged on lightning conducter is used to apply voltage to it, the annular voltage transformer being arranged on four down conductors of shaft tower gathers its voltage signal and is sent to earth resistance device, ring current transformer 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 and is sent to earth resistance device respectively, and earth resistance device carries out that contact resistance resistance is calculated.The present invention carries out the comprehensive detection of the resistance of tower body and grounding body using four down conductors of shaft tower and overhead ground wire as measurement point simultaneously.

Description

A kind of comprehensive detection system and method for transmission line of electricity earthed system

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)

1. a kind of comprehensive detection system of transmission line of electricity earthed system, it is characterized in that, including earth resistance device and point The eight annular voltage transformers and eight ring current transformers not being connected with earth resistance device, described eight rings Shape voltage transformer and eight ring current transformers are separately positioned on four down conductors of shaft tower and shaft tower left and right ends On overhead ground wire, and annular voltage transformer and ring current transformer in pairs and are disposed adjacent;It is arranged on shaft tower or so two Annular voltage transformer on the overhead ground wire at end is used to apply voltage on overhead ground wire, is arranged on four ground connection of shaft tower The voltage signal of annular voltage transformer collection four down conductors of shaft tower on downlead is simultaneously sent to earth resistance Device, the ring current transformer gather four down conductors of shaft tower and the overhead ground wire of shaft tower left and right ends respectively Eight groups of current signals are simultaneously sent to earth resistance device, and the earth resistance device is to eight groups of voltage signals and electric current Signal be calculated the contact resistance resistance of tested shaft tower transmission line of electricity earthed system.
2. a kind of comprehensive detection system of transmission line of electricity earthed system as claimed in claim 1, it is characterized in that, the ground connection electricity Hindering test device includes MCU, signal generating module, the first Current Voltage modular converter, signal amplification module, signal behavior mould Block, power amplifier module, the second Current Voltage modular converter, filtration module, range handover module, AC-DC conversion module, One AD conversion module, display module, GPRS module, the second AD conversion module and power module, the MCU are sent out by signal successively Raw module, the first Current Voltage modular converter, signal amplification module, signal selection module and power amplifier module are with being arranged on bar Annular voltage transformer on the overhead ground wire of tower left and right ends is connected, and eight ring current transformers are successively by the Two Current Voltage modular converters, filtration module, range handover module, AC-DC conversion module and the first AD conversion module and MCU It is connected, the annular voltage transformer being arranged on four down conductors of shaft tower passes through the second AD conversion module and MCU phases Even, 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 modular converter, letter The output of number amplification module determines the sinusoidal ac signal of magnitude of voltage, then by signal selection module by different magnitudes of voltage distribute to It is arranged in overhead ground wire Shang No. tetra- voltage transformer output branch roads of shaft tower left and right ends, while by power amplifier module The load driving force of raising circuit is arranged on the road mutual induction of voltage of overhead ground wire Shang tetra- of shaft tower left and right ends so as to drive Device;When overhead ground wire Shang No. tetra- voltage transformers by being arranged on shaft tower left and right ends are sensed to the frame of shaft tower left and right ends On empty lightning conducter during voltage signal, electric current should be produced in tested loop, by eight ring current transformers 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, meanwhile, the annular electro being arranged on four down conductors of shaft tower The voltage signal of pressure transformer collection four down conductors of shaft tower is simultaneously converted to digital quantity feeding by the second AD conversion module MCU;MCU to eight groups of voltage signals and current signal be calculated the contact resistance of tested shaft tower transmission line of electricity earthed system Resistance is simultaneously shown by display module and sent by GPRS module to the host computer of remote monitoring center.
3. a kind of comprehensive detection system of transmission line of electricity earthed system as claimed in claim 2, it is characterized in that, the ground connection electricity Resistance test device also includes serial port module, and the serial port module is used for adjusting parameter and program.
4. a kind of comprehensive detection system of transmission line of electricity earthed system as claimed in claim 2, it is characterized in that, the ground connection electricity Resistance test device also includes clock module, and the clock module is used to determine system time.
5. a kind of comprehensive detection system of transmission line of electricity earthed system as claimed in claim 2, it is characterized in that, the ground connection electricity Resistance test device also includes memory module, and the memory module is for the related data during storing earth resistance and connects Ground resistance measurement result.
6. a kind of method for comprehensive detection of transmission line of electricity earthed system, it is characterized in that, utilize the synthesis described in claim 1 to 5 Detecting system 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 on two lightning conducters of shaft tower left and right ends and On down conductor, and it is attached with earth resistance device;
Step 2, earth resistance device is to four voltage transformers on two lightning protection lines of shaft tower left and right ends Sine voltage signal is sent, 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 earth resistance Device;
Step 4, second is carried out after certain interval of time to test, four voltage transformers sensing on down conductor Obtain the voltage in voltage transformer and be sent into earth resistance device, at the same time, eight current transformers sense to obtain Electric current in lightning conducter and down conductor is simultaneously sent into earth resistance device;
Step 5, earth resistance device is according to sensing to four voltage signals on lightning conducter and the voltage and current gathered Signal carries out that grounding resistance resistance is calculated.
7. a kind of method for comprehensive detection of transmission line of electricity earthed system as claimed in claim 6, it is characterized in that, the step 2 Detailed process be:MCU control signals occur module and send sinusoidal ac signal and by the first Current Voltage modular converter, letter The output of number amplification module determines the sinusoidal ac signal of magnitude of voltage, then by signal selection module by different magnitudes of voltage distribute to In four voltage transformers output branch road on two lightning protection lines of shaft tower left and right ends, while by power amplifier module The load driving force of circuit is improved so as to four mutual induction of voltage of the drive installation on two lightning protection lines of shaft tower left and right ends Device senses alternating voltage to corresponding lightning conducter.
8. a kind of method for comprehensive detection of transmission line of electricity earthed system as claimed in claim 6, it is characterized in that, eight electricity Current transformer senses to obtain the electric current in lightning conducter and down conductor and is sent into the detailed process of earth resistance device: Eight current transformers respectively detect eight road current signals, and are converted to voltage by the second 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, and being converted to digital quantity by the first AD conversion module is sent into MCU.
9. a kind of method for comprehensive detection of transmission line of electricity earthed system as claimed in claim 6, it is characterized in that, it is described to be arranged on Four voltage transformers on down conductor sense to obtain the voltage in voltage transformer and are sent into earth resistance device Detailed process be:The voltage signal and process of four voltage transformers collection down conductor on down conductor Second AD conversion module is converted to digital quantity and is sent into MCU.
10. a kind of method for comprehensive detection of transmission line of electricity earthed system as described in claim 6-9 any one, its feature It is that 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 right side institute There are shaft tower parallel equivalent resistance impedance value, Z1And Z2Respectively tested two overhead ground wires between shaft tower and left side first order shaft tower Equivalent resistance impedance value, Z3And Z4Respectively tested two overhead ground wire equivalent resistances between shaft tower and right side first order shaft tower hinder Anti- value, Z5、Z6、Z7、Z8Respectively four down conductor equivalent resistances, ZegFor four down conductor parallel equivalent resistances;
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 To utilize the corresponding overhead ground wire branch road of current transformer measurement In it is current generated, following matrix equation can be obtained:
<mrow> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> </msub> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> </msub> </mrow> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> </msub> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> </msub> </mrow> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> </msub> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> </msub> </mrow> </mtd> <mtd> <mrow> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> </msub> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> </msub> </mrow> </mtd> <mtd> <mrow> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> </msub> <mo>+</mo> <msub> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msub> <mi>Z</mi> <mn>1</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>2</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>3</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>4</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mi>L</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mi>R</mi> </msub> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mi>g</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>Z</mi> <mrow> <mi>e</mi> <mi>g</mi> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>=</mo> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
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 With this Meanwhile correspond to using 4 overhead ground wires 4 and down conductor of current transformer measurement and current generated in branch road be
<mrow> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> <mo>&amp;prime;</mo> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>5</mn> <mo>&amp;prime;</mo> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> <mo>&amp;prime;</mo> </msubsup> </mrow> </mtd> <mtd> <mtable> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>5</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>6</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>7</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>8</mn> <mo>&amp;prime;</mo> </msubsup> </mrow> </mtd> </mtr> </mtable> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> <mo>&amp;prime;</mo> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>6</mn> <mo>&amp;prime;</mo> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>1</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>2</mn> <mo>&amp;prime;</mo> </msubsup> </mrow> </mtd> <mtd> <mtable> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>5</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>6</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>7</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>8</mn> <mo>&amp;prime;</mo> </msubsup> </mrow> </mtd> </mtr> </mtable> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> <mo>&amp;prime;</mo> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>7</mn> <mo>&amp;prime;</mo> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> <mo>&amp;prime;</mo> </msubsup> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>5</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>6</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>7</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>8</mn> <mo>&amp;prime;</mo> </msubsup> </mrow> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> <mo>&amp;prime;</mo> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>8</mn> <mo>&amp;prime;</mo> </msubsup> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mrow> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>3</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>4</mn> <mo>&amp;prime;</mo> </msubsup> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>5</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>6</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>7</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>I</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>8</mn> <mo>&amp;prime;</mo> </msubsup> </mrow> </mtd> </mtr> </mtable> </mfenced> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msub> <mi>Z</mi> <mn>1</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>2</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>3</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>4</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>5</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>6</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>7</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mn>8</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mi>L</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>Z</mi> <mi>R</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>R</mi> <mrow> <mi>e</mi> <mi>g</mi> </mrow> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>=</mo> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>5</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>6</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>7</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>U</mi> <mo>&amp;CenterDot;</mo> </mover> <mn>8</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
By I5Z5=I6Z6=I7Z7=I8Z8
<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>Z</mi> <mn>6</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>I</mi> <mn>5</mn> </msub> <msub> <mi>I</mi> <mn>6</mn> </msub> </mfrac> <msub> <mi>Z</mi> <mn>5</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>Z</mi> <mn>7</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>I</mi> <mn>5</mn> </msub> <msub> <mi>I</mi> <mn>7</mn> </msub> </mfrac> <msub> <mi>Z</mi> <mn>5</mn> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>Z</mi> <mn>8</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>I</mi> <mn>5</mn> </msub> <msub> <mi>I</mi> <mn>8</mn> </msub> </mfrac> <msub> <mi>Z</mi> <mn>5</mn> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>
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 meetingCondition Under, solution of equations presence is simultaneously unique;
Solve equation group and obtain circuit parameter Reg
CN201711125195.2A 2017-11-14 2017-11-14 A kind of comprehensive detection system and method for transmission line of electricity earthed system CN107656144A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711125195.2A CN107656144A (en) 2017-11-14 2017-11-14 A kind of comprehensive detection system and method for transmission line of electricity earthed system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711125195.2A CN107656144A (en) 2017-11-14 2017-11-14 A kind of comprehensive detection system and method for transmission line of electricity earthed system

Publications (1)

Publication Number Publication Date
CN107656144A true CN107656144A (en) 2018-02-02

Family

ID=61121506

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711125195.2A CN107656144A (en) 2017-11-14 2017-11-14 A kind of comprehensive detection system and method for transmission line of electricity earthed system

Country Status (1)

Country Link
CN (1) CN107656144A (en)

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61132880A (en) * 1984-11-30 1986-06-20 Kyushu Electric Power Co Inc Method and instrument for measuring ground resistance of individual steel tower of transmission line brought to interlocked earthing
CN1158425A (en) * 1996-11-26 1997-09-03 山西省忻州地区电业局 Release-free electric cable tower ground resistance testing method and device
KR20060038542A (en) * 2004-10-30 2006-05-04 한국전력공사 The techniques and the device to measure the ground resistance using the leakage current in the ground conductor
CN1828313A (en) * 2006-02-21 2006-09-06 武汉高压研究所 Pole tower earthing resistance quick testing method without unfastening wire and device
KR20070046645A (en) * 2005-10-31 2007-05-03 한국전력공사 Measurement method of grounding resistance of transmission towers in an energized transmission line system
CN101290336A (en) * 2008-06-18 2008-10-22 昆明理工大学 Alternating-current powerline thunderbolt shielding failure and counterattack recognition method
CN101980032A (en) * 2010-08-17 2011-02-23 南京信息工程大学 Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode
WO2012015107A1 (en) * 2010-07-28 2012-02-02 한국전력공사 Method for apparatus for measuring composite ground resistance of neutral wire of distribution line in operation
CN102680798A (en) * 2012-02-28 2012-09-19 山东建筑大学 Online measurement method and device for grounding resistor of rod tower
CN104635087A (en) * 2015-02-09 2015-05-20 云南电网有限责任公司电力科学研究院 Inspection method for grounding safety performance of power transmission wire pole tower during lightning wire insulation erection
CN204903655U (en) * 2015-08-17 2015-12-23 国网辽宁省电力有限公司抚顺供电公司 Tower grounding resistance measurement device of disconnect ground downlead exempts from
CN105891604A (en) * 2016-04-11 2016-08-24 国网安徽省电力公司电力科学研究院 Loop impedance method of measuring power transmission support grounding impedance and testing system
CN105891606A (en) * 2016-06-27 2016-08-24 国网甘肃省电力公司白银供电公司 Device for testing tower grounding resistance through disassembly-free ground lead
CN206450761U (en) * 2016-06-27 2017-08-29 国网甘肃省电力公司白银供电公司 Exempt from the device that dismounting ground wire tests steel tower grounding resistance

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61132880A (en) * 1984-11-30 1986-06-20 Kyushu Electric Power Co Inc Method and instrument for measuring ground resistance of individual steel tower of transmission line brought to interlocked earthing
CN1158425A (en) * 1996-11-26 1997-09-03 山西省忻州地区电业局 Release-free electric cable tower ground resistance testing method and device
KR20060038542A (en) * 2004-10-30 2006-05-04 한국전력공사 The techniques and the device to measure the ground resistance using the leakage current in the ground conductor
KR20070046645A (en) * 2005-10-31 2007-05-03 한국전력공사 Measurement method of grounding resistance of transmission towers in an energized transmission line system
CN1828313A (en) * 2006-02-21 2006-09-06 武汉高压研究所 Pole tower earthing resistance quick testing method without unfastening wire and device
CN101290336A (en) * 2008-06-18 2008-10-22 昆明理工大学 Alternating-current powerline thunderbolt shielding failure and counterattack recognition method
WO2012015107A1 (en) * 2010-07-28 2012-02-02 한국전력공사 Method for apparatus for measuring composite ground resistance of neutral wire of distribution line in operation
CN101980032A (en) * 2010-08-17 2011-02-23 南京信息工程大学 Method and device for measuring grounding resistance of lightning protection belt on top in wireless mode
CN102680798A (en) * 2012-02-28 2012-09-19 山东建筑大学 Online measurement method and device for grounding resistor of rod tower
CN104635087A (en) * 2015-02-09 2015-05-20 云南电网有限责任公司电力科学研究院 Inspection method for grounding safety performance of power transmission wire pole tower during lightning wire insulation erection
CN204903655U (en) * 2015-08-17 2015-12-23 国网辽宁省电力有限公司抚顺供电公司 Tower grounding resistance measurement device of disconnect ground downlead exempts from
CN105891604A (en) * 2016-04-11 2016-08-24 国网安徽省电力公司电力科学研究院 Loop impedance method of measuring power transmission support grounding impedance and testing system
CN105891606A (en) * 2016-06-27 2016-08-24 国网甘肃省电力公司白银供电公司 Device for testing tower grounding resistance through disassembly-free ground lead
CN206450761U (en) * 2016-06-27 2017-08-29 国网甘肃省电力公司白银供电公司 Exempt from the device that dismounting ground wire tests steel tower grounding resistance

Similar Documents

Publication Publication Date Title
CN102221644B (en) System and method for online monitoring grounding networks of power stations and substations
TWI442062B (en) Method of measuring earth ground resistance of a pylon using a single clamp
AU2012203278B2 (en) Directional detection of a resistive earth fault and of breaking of a medium-voltage conductor
CN201229389Y (en) Cable sheath insulation on-line monitoring device
WO2015117304A1 (en) System for online monitoring of zinc oxide arrester and method thereof
CN104655982B (en) A kind of distribution circuit single-phase earth fault point inspection system and method
CN101825657B (en) Medium-high voltage single-core crosslinked cable induction voltage and circular-current online detection method and device
US20140247063A1 (en) Earth Ground Tester With Remote Control
CN2549477Y (en) DC system ground fault tester
CN101459334A (en) Electrical power system failure information obtaining method
CN203811728U (en) Single-core power cable sheath earth fault detecting system based on circulation measurement
CN102955088B (en) A kind of zero resistance insulator detection method based on finite element data storehouse
CN103926510A (en) Current and carrying capacity online monitoring and fault diagnosing and locating method for cable protection layer
CN104155526A (en) Method for measuring impact earthing impedance of electric transmission overhead line structure earthing device with lightning conductor
CN102095999B (en) Measuring device for diagnosing connecting state of grounding network
CN102707191B (en) Diagnosis device and diagnosis method for corrosion of earth screen of large-size transformer substation
AU2013327204B2 (en) Method for monitoring a plurality of electrical energy lines in a cable harness
CN202126470U (en) Power cable insulation online monitoring device
CN104374993B (en) Electricity larceny prevention method and device based on power internet of things and processor
CN104267305B (en) A kind of method and system judging Surge Protector SPD degradation
CN103941161A (en) On-line monitoring system for current and carrying capacity of cable sheath
CN202939222U (en) Cable conductor direct-current resistance test device
CN102879704B (en) Multiparameter data fusion detection method for high resistance ground faults of high-voltage transmission line
CN106771933A (en) Power cable shelf depreciation high frequency electric monitoring system based on wireless network
CN104698311B (en) A kind of DC line direct current arrester live detection method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination