CN106645975A - Transformer station independent lightning rod grounding device grounding impedance measuring system and method - Google Patents
Transformer station independent lightning rod grounding device grounding impedance measuring system and method Download PDFInfo
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- CN106645975A CN106645975A CN201610913078.1A CN201610913078A CN106645975A CN 106645975 A CN106645975 A CN 106645975A CN 201610913078 A CN201610913078 A CN 201610913078A CN 106645975 A CN106645975 A CN 106645975A
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- 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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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Abstract
The invention provides a transformer station independent lightning rod grounding device grounding impedance measuring system and method. The transformer station independent lightning rod grounding device grounding impedance measuring system comprises an independent lightning rod grounding device and a transformer station grounding grid which are sequentially connected in series to form a closed loop, and a loop impedance measuring device connected to the closed loop and comprising a testing power supply connected to the closed loop. According to the technical scheme, the independent lightning rod grounding device grounding impedance measuring efficiency can be improved, and waste of manpower and material resources is reduced.
Description
Technical field
The present invention relates to technical field of power systems, more specifically, is related to a kind of transformer station's independent lightning rod ground connection
The measuring system and method for device impedance ground.
Background technology
Operation of Electric Systems is highly prone to effects of lightning, in order to meet the lightning protection demand of power system, in transformer station often
Independent lightning rod is set, and the independent lightning rod is mutually not attached to grounding net of transformer substation, to reduce damage of the thunder and lightning to power system.
When thunderbolt independent lightning rod, the earthing potential of independent lightning rod earthing or grounding means has and is lifted by a relatively large margin.To avoid independently keeping away
The lifting of thunder pin earthing or grounding means earthing potential produces impact to other equipment in transformer station, and independent lightning rod earthing or grounding means is generally only
Erect and put, be mutually not attached to grounding net of transformer substation, independent lightning rod earthing or grounding means must not be connected with grounding net of transformer substation major network,
And should have certain distance requirement with grounding net of transformer substation major network in underground.And in order to realize the protection to power system, often
Need to measure independent lightning rod impedance ground.
Measurement currently for impedance ground mainly adopts three-level method, as shown in figure 1, three electrode method footing impedance measuring apparatus
Mainly include：The electric current pole 9 of the ammeter 33, experiment power supply 8 and insertion underground that are sequentially connected in series with tested earthing or grounding means 7 constitutes
Tie point, the voltmeter 34 being sequentially connected in series with tested earthing or grounding means and insertion underground voltage pole 10 composition second
Road.Wherein, electric current pole 9 apart from the unwrapping wire of tested earthing or grounding means 7 apart from DGCFor 4-5D, voltage pole 10 is apart from tested ground connection dress
7 unwrapping wire is put apart from DGPFor 0.618DGC, D is the catercorner length of tested earthing or grounding means 7.Measured by calculating voltmeter 34
Tested earthing or grounding means 7 the measurement of voltage U and ammeter 33 the electric current I for flowing through tested earthing or grounding means 7 ratio, you can
To the impedance ground R of tested earthing or grounding means 7.
It is located in transformer station place yet with independent lightning rod earthing or grounding means, place lower section also has grounding net of transformer substation
Major network, therefore when the impedance ground to independent lightning rod earthing or grounding means is measured, although independent lightning rod earthing or grounding means
Catercorner length is smaller, but to reduce impact of the grounding net of transformer substation to independent lightning rod earthing or grounding means measurement result, electricity
Stream pole and voltage pole unwrapping wire are still needed and are placed into outside transformer station, labor intensive and material resources, along with a transformer station often
There are many independent lightning rods, can more expend substantial amounts of man power and material, cause the measurement efficiency of impedance ground low.
In sum, how to improve the measurement efficiency of transformer station's independent lightning rod earthing or grounding means impedance ground becomes mesh
Front those skilled in the art technical problem urgently to be resolved hurrily.
The content of the invention
It is an object of the invention to provide a kind of measurement scheme of transformer station's independent lightning rod earthing or grounding means impedance ground, to solve
When the impedance ground of independent lightning rod earthing or grounding means is certainly measured in the prior art described in background technology, need measurement dress
The voltage pole and electric current pole put is placed into outside transformer station, causes to expend the problem of a large amount of man power and materials.
In order to solve above-mentioned technical problem, the present invention provides following technical scheme：
According to the first aspect of the invention, there is provided a kind of measurement of transformer station's independent lightning rod earthing or grounding means impedance ground
System, the measuring system includes：
Independent lightning rod earthing or grounding means and grounding net of transformer substation, the independent lightning rod earthing or grounding means and grounding net of transformer substation
Sequential series constitute closed-loop path；
It is connected to the impedance measurement circuit device of the closed-loop path；Wherein, the impedance measurement circuit device includes connecting
It is connected to the test power supply of the closed-loop path.
Preferably, the impedance measurement circuit device includes being connected to the pincerlike earth resistance of the closed-loop path
Instrument；
The test power supply of the pincerlike earth resistance tester, including：It is connected to the potential winding of the closed-loop path, institute
Potential winding is stated for providing electric energy；
The pincerlike earth resistance tester also includes：
It is connected to the current coil of the closed-loop path；And it is electric respectively with the potential winding and the current coil
The ohmmeter body of connection；Wherein,
The ohmmeter body includes the impedance loop being electrically connected with the current coil and the potential winding
Calculator, and the impedance loop display electrically connected with the impedance loop calculator.
Preferably, the test power supply of the impedance measurement circuit device includes：The alien frequencies for being connected to the closed-loop path is surveyed
Examination power supply；
The impedance measurement circuit device also includes：It is connected to the ammeter of the closed-loop path；It is connected to the test
Both ends of power circuit and with the independent lightning rod earthing or grounding means and the voltage of grounding net of transformer substation place lines in parallel
Table.
Preferably, the grounding net of transformer substation is connected with the down conductor for extending ground；
The independent lightning rod earthing or grounding means is connected on the ground by wire with the down conductor.
Preferably, the measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground, also includes：
The impedance ground calculator electrically connected with the impedance measurement circuit device.
According to the second aspect of the invention, a kind of survey of transformer station's independent lightning rod earthing or grounding means impedance ground is additionally provided
Amount method, the method is used for the measurement system of the transformer station's independent lightning rod earthing or grounding means impedance ground described in above-mentioned technical proposal
System, the measuring method includes：
Independent lightning rod earthing or grounding means and grounding net of transformer substation sequential series are constituted into closed-loop path；
Obtain the grounded screen impedance of the grounding net of transformer substation；
Electric energy is applied to the closed-loop path using test power supply, using impedance measurement circuit device described closure back is obtained
The loop voltage and loop current on road, according to the ratio of the loop voltage and loop current the loop resistance of the closed-loop path is calculated
It is anti-；
Calculate the ground connection of the difference as the independent lightning rod earthing or grounding means of the impedance loop and the grounded screen impedance
Impedance.
Preferably, it is described that electric energy is applied to the closed-loop path using test power supply, obtained using impedance measurement circuit device
The loop voltage and loop current of the closed-loop path are taken, the closure is calculated according to the ratio of the loop voltage and loop current
The impedance loop in loop, including：
Alien frequencies test power supply is produced using the potential winding for being connected to the closed-loop path, is produced by the closed-loop path
Loop voltage and loop current；
The loop current is collected by being connected to the current coil of the closed-loop path；
Using the impedance loop calculator that electrically connects with the potential winding and current coil calculate the loop voltage and
The ratio of loop current, as the impedance loop.
Preferably, it is described that electric energy is applied to the closed-loop path using test power supply, obtained using impedance measurement circuit device
The loop voltage and loop current of the closed-loop path are taken, the closure is calculated according to the ratio of the loop voltage and loop current
The impedance loop in loop, including：
Power supply being tested using the alien frequencies for being connected to the closed-loop path, electric energy is applied to the closed-loop path；
The loop current of the closed-loop path is measured using the ammeter for being connected to the closed-loop path；
Using be connected to it is described test both ends of power circuit and with the independent lightning rod earthing or grounding means and the transformer station
The voltmeter of grounded screen place lines in parallel measures the loop voltage of the closed-loop path；
The ratio of the loop voltage and the loop current is calculated, as the impedance loop.
Preferably, difference the connecing as the independent lightning rod earthing or grounding means of the counter circuit impedance and grounded screen impedance
Ground impedance, including：
The impedance loop and institute are calculated using the impedance ground calculator electrically connected with the impedance measurement circuit device
The difference of grounded screen impedance is stated, as the impedance ground of the independent lightning rod earthing or grounding means.
The course of work of the measurement scheme of transformer station's independent lightning rod earthing or grounding means impedance ground that the present invention is provided is as follows：
Independent lightning rod earthing or grounding means be under normal operating condition it is discrete with grounding net of transformer substation, when need it is right
When lightning rod impedance ground is measured, independent lightning rod earthing or grounding means and grounding net of transformer substation are connected first, formed
Closed-loop path, is then connected impedance measurement circuit device with closed-loop path.Because impedance measurement circuit device includes connection
In the test power supply of closed-loop path, test power supply can provide electric energy, effect of the closed-loop path in test power supply to closed-loop path
Under, loop voltage and loop current can be produced, impedance measurement circuit device gathers the loop voltage of closed-loop path, and measurement is flowed through
The loop current of closed-loop path, the then ratio of counter circuit voltage and loop current, you can obtain the impedance loop of closed-loop path,
And the grounded screen impedance of grounding net of transformer substation is known in advance, by counter circuit impedance and the difference of grounded screen impedance, as this
The impedance ground of independent lightning rod earthing or grounding means.Wherein, the grounded screen impedance of grounding net of transformer substation can by design drawing or
Person's preventive test report is obtained.
Can be drawn by the above-mentioned course of work, transformer station's independent lightning rod earthing or grounding means impedance ground that the present invention is provided
Measurement scheme, by the way that original mutually disjunct independent lightning rod earthing or grounding means and grounding net of transformer substation are carried out into sequential series,
Constitute closed-loop path, it is not necessary to the electric current pole unwrapping wire and voltage pole unwrapping wire of the measurement apparatus mentioned in background technology, only by
Impedance measurement circuit device provides test power supply for closed-loop path, and then the loop voltage and loop by measuring closed-loop path is electric
Stream can be calculated the impedance loop of closed-loop path, and then would know that the impedance ground of independent lightning rod earthing or grounding means.Energy
Enough improve the measurement efficiency of transformer station's independent lightning rod earthing or grounding means impedance ground.The technical scheme that the present invention is provided need not be by
Electric current pole unwrapping wire and voltage pole unwrapping wire are positioned over outside transformer station and measure, and can reduce the man power and material that measurement expends.
Description of the drawings
Technical scheme in order to be illustrated more clearly that the embodiment of the present invention, below will be to making needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, for those of ordinary skills, do not paying creative work
Property on the premise of, can be obtaining other accompanying drawings according to these accompanying drawings.
Fig. 1 is a kind of structure chart of three electrode method footing impedance measuring apparatus that correlation technique is provided；
Fig. 2 is a kind of measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground provided in an embodiment of the present invention
Structural representation；
Fig. 3 is a kind of measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground provided in an embodiment of the present invention
Structural representation；
Fig. 4 is a kind of structural representation of pincerlike earth resistance tester provided in an embodiment of the present invention；
Fig. 5 is a kind of measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground provided in an embodiment of the present invention
Structural representation；
Fig. 6 is a kind of measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground provided in an embodiment of the present invention
Structural representation；
Fig. 7 is a kind of measuring method of transformer station's independent lightning rod earthing or grounding means impedance ground provided in an embodiment of the present invention
Schematic flow sheet；
Fig. 8 is a kind of schematic flow sheet of the measuring method of impedance loop that embodiment illustrated in fig. 7 is provided；
Fig. 9 is a kind of schematic flow sheet of the measuring method of impedance loop that embodiment illustrated in fig. 7 is provided；
Figure 10 is a kind of schematic flow sheet of the measuring method of impedance ground that embodiment illustrated in fig. 7 is provided.
Each structure shown in Fig. 1 to Figure 10 is as follows with the corresponding relation of reference：
1- independent lightning rod earthing or grounding means, 2- grounding net of transformer substation, 3- impedance measurement circuit devices, 31- alien frequencies test electricity
Source, 32- pincer ground resistance measuring instruments, 321- potential windings, 322- current coils, 323- ohmmeter bodies, the resistance of 3231- loops
Anti- calculator, 3232- impedance loop displays, 33- ammeters, 34- voltmeters, 4- down conductors, the impedance of 5- grounded screens are surveyed
Amount device, 6- impedance ground calculators, the tested earthing or grounding means of 7-, 8- experiment power supplies, 9- electric currents pole, 10- voltage poles.
Specific embodiment
The measurement scheme of transformer station's independent lightning rod earthing or grounding means impedance ground provided in an embodiment of the present invention, solves the back of the body
When the impedance ground of independent lightning rod earthing or grounding means is measured in the prior art described in scape technology, need measurement apparatus
Voltage pole and electric current pole are placed into outside transformer station, cause to expend the problem of a large amount of man power and materials.
In order that those skilled in the art more fully understand the technical scheme in the embodiment of the present invention, and make of the invention real
Apply the above-mentioned purpose of example, feature and advantage can become apparent from it is understandable, below in conjunction with the accompanying drawings to the technology in the embodiment of the present invention
Scheme is described in further detail.
Fig. 2 is referred to, Fig. 2 is a kind of transformer station's independent lightning rod earthing or grounding means impedance ground provided in an embodiment of the present invention
Measuring system structural representation, as shown in Fig. 2 the measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground
Including following structure：
Independent lightning rod earthing or grounding means 1 and grounding net of transformer substation 2, independent lightning rod earthing or grounding means 1 and grounding net of transformer substation 2
Sequential series constitute closed-loop path.
Grounding net of transformer substation 2 often takes up an area larger, its impedance ground requirement often below 0.5 Europe, and independent lightning rod connects
The impedance ground of ground device 1 often requires that less than 10 Europe both are different on the order of magnitude, and the He of independent lightning rod earthing or grounding means 1
Grounding net of transformer substation 2 is mutually not connected to, therefore when independent lightning rod 1 impedance ground of earthing or grounding means is measured, needing will be independent lightning-arrest
Pin earthing or grounding means 1 and the sequential series of grounding net of transformer substation 2 constitute closed-loop path, can facilitate and the closed-loop path is measured,
Impedance loop is obtained, and because the impedance ground of independent lightning rod earthing or grounding means 1 is much larger than the impedance of grounding net of transformer substation 2, therefore
Electric energy focuses mostly in independent lightning rod earthing or grounding means 1, and the infringement to grounding net of transformer substation 2 is less.Meanwhile, independent lightning rod ground connection
The impedance ground of device 1 is much larger than the impedance of grounding net of transformer substation 2, can be according to impedance loop estimation by obtaining impedance loop
The impedance ground of independent lightning rod earthing or grounding means 1.
It is connected to the impedance measurement circuit device 3 of closed-loop path；Wherein, impedance measurement circuit device 3 includes being connected to closing
Close the test power supply in loop.
By the way that impedance measurement circuit device 3 is connected into closed-loop path, because impedance measurement circuit device 3 includes being connected to
The measurement power supply of closed-loop path, therefore, provided with a certain size loop voltage for closed-loop path by the measurement power supply
Electric energy, forms in the closed circuit loop current, so as to impedance measurement circuit device 3 according to the loop voltage and loop current it
Than, be calculated the impedance loop of closed-loop path, and then calculate the impedance loop and grounding net of transformer substation 2 grounded screen impedance it
Difference, obtains the impedance ground of independent lightning rod earthing or grounding means 1, and the formula is R=Rh-Rg, and wherein R is independent lightning rod ground connection dress
1 impedance ground is put, Rh is impedance loop, and Rg is the grounded screen impedance of grounding net of transformer substation 2.
To sum up, the measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground that the present invention is provided, by by original
First mutually disjunct independent lightning rod earthing or grounding means 1 and grounding net of transformer substation 2 carry out sequential series, constitute closed-loop path and are surveyed
Amount, it is not necessary to the electric current pole unwrapping wire and voltage pole unwrapping wire of the measurement apparatus mentioned in background technology, surveys only by impedance loop
Amount device 3 provides test power supply for closed-loop path, then i.e. can by measuring the loop voltage and loop current of closed-loop path
The impedance loop of closed-loop path is calculated, and then would know that the impedance ground of independent lightning rod earthing or grounding means 1.Change can be improved
The measurement efficiency of the impedance ground of power station independent lightning rod earthing or grounding means 1.The technical scheme that the present invention is provided need not be by electric current pole
Unwrapping wire and voltage pole unwrapping wire are positioned over outside transformer station and measure, and can reduce the man power and material that measurement expends.
The test of the impedance loop of the closed-loop path provided for embodiment illustrated in fig. 2, can be surveyed using pincerlike earth resistance
Amount instrument method, specifically as shown in Figure 3 and Figure 4, the impedance measurement circuit device 3 that embodiment illustrated in fig. 2 is provided includes being connected to closure
The pincerlike ground resistance measuring instrument 32 in loop, the test power supply of the pincerlike ground resistance measuring instrument 32 includes：
The potential winding 321 of closed-loop path is connected to, potential winding 321 is used to provide electric energy；
The pincerlike earth resistance tester also includes：It is connected to the current coil 322 of closed-loop path；And and potential winding
321 and the ohmmeter body 323 that is electrically connected of current coil 322；
Wherein, ohmmeter body 323 includes being hindered with the loop that potential winding 321 and current coil 322 are electrically connected
Anti- calculator 3231, and the impedance loop display 3232 electrically connected with impedance loop calculator 3231.
As shown in Figure 3 and Figure 4, pincerlike ground resistance measuring instrument 32 has 322 two lines of potential winding 321 and current coil
Circle, potential winding 321 can provide test power supply (voltage is U) such as transformer to closed-loop path, serve as the work(of test power supply
Can, so, for example same circuit in closed-loop path, and loop current I is formed in the closed circuit, loop current I is by pincerlike ground connection
Current coil 322 in resistance measuring instrument 32 is gathered, by impedance loop calculator 3231 and current coil 322 and potential winding
321 are connected, by counter circuit voltage and the ratio U/I of loop current, you can obtain impedance loop Rh, so as to according to the loop electricity
The impedance ground of independent lightning rod earthing or grounding means 1 is further calculated in resistance.In addition, the pincerlike ground resistance measuring instrument also includes loop
Impedance display 3232, is shown by the impedance loop of 3232 pairs of measurements of the impedance loop display, enables to operation
Personnel timely and intuitively recognize the impedance loop of the closed-loop path, the convenient impedance ground to independent lightning rod earthing or grounding means 1
Calculated.
For in Fig. 2, the measurement of the impedance loop of closed-loop path can adopt ammeter voltmeter method, the ammeter voltage
Table method is concrete as shown in figure 5, the test power supply of the impedance measurement circuit device 3 of embodiment illustrated in fig. 2 offer includes being connected to closing
The alien frequencies test power supply 31 in loop is closed, it is preferable that the frequency of the alien frequencies test power supply 31 is not equal to 50HZ, to avoid transformer station ground
The frequency interferences of common 50HZ in net.
Alien frequencies test power supply 31 is connected to closed-loop path, can produce loop voltage U, is that the independence on closed-loop path is taken shelter from the thunder
Pin earthing or grounding means 1 and grounding net of transformer substation 2 provide electric energy, so as to form loop current I, material is thus formed a complete electricity
Road.
In addition, the impedance measurement circuit device 3 also includes：It is connected to the ammeter 33 of closed-loop path；It is connected to alien frequencies survey
Examination the two-termial line of power supply 31 and with independent lightning rod earthing or grounding means 1 and the voltmeter of the place lines in parallel of grounding net of transformer substation 2
34。
Ammeter 33 is connected on closed-loop path, can calculate loop current I, and voltmeter 34 is connected to alien frequencies test power supply
31 two-termial lines, and with independent lightning rod earthing or grounding means 1 and the place lines in parallel of grounding net of transformer substation 2, can calculate and be applied to
Loop voltage U of independent lightning rod earthing or grounding means 1 and grounding net of transformer substation 2, by calculate the loop voltage and loop current it
Compare U/I, you can obtain the impedance loop Rh of the closed-loop path.Wherein, ammeter 33 is mountable to alien frequencies test power supply 31 two ends
Main road on, be also mountable on independent lightning rod earthing or grounding means 1 and the place branch road of grounding net of transformer substation 2.
In addition, grounding net of transformer substation 2 is connected with the down conductor 4 for extending ground, in independent lightning rod earthing or grounding means 1
When being connected with grounding net of transformer substation 2, in order to easy to connect, the independent lightning rod earthing or grounding means 1 in Fig. 2 on the ground by wire with
Down conductor 4 connects.
Power equipment in transformer station is attached often through down conductor 4 with grounding net of transformer substation 2, therefore power transformation
Grounded screen of standing 2 generally all has down conductor 4, by the way that independent lightning rod earthing or grounding means 1 by wire and is grounded on the ground
Downlead 4 connects, and independent lightning rod earthing or grounding means 1 is connected in underground with grounding net of transformer substation 2 by the earth, so as to independently keep away
Thunder pin earthing or grounding means 1 constitutes complete closed-loop path with grounding net of transformer substation 2 by wire, down conductor 4 and the earth.Section
The Connection Time to independent lightning rod earthing or grounding means 1 and grounding net of transformer substation 2 has been saved, measuring and calculating efficiency has been improve.
In addition, the automatic measurement in order to realize the impedance ground to independent lightning rod earthing or grounding means 1, as a kind of preferred
Embodiment, as shown in fig. 6, the measuring system of the transformer station's independent lightning rod earthing or grounding means impedance ground shown in Fig. 2 also includes：
The grounded screen impedance measurement device 5 of grounding net of transformer substation 2 is connected to, for measuring the ground connection of grounding net of transformer substation 2
Net impedance.
The grounded screen impedance of grounding net of transformer substation 2 can in advance be obtained by Query Design drawing or preventive test report
Know, when can not in advance know the grounded screen impedance, the grounded screen impedance measurement device 5 that can pass through in the present embodiment is surveyed
Amount, the grounded screen resistance measurement apparatus can be the pincerlike ground resistance measuring instrument shown in Fig. 3, specifically independent will can take shelter from the thunder
Pin earthing or grounding means 1 is connected into before closed-loop path with grounding net of transformer substation 2, and individually grounding net of transformer substation 2 is calculated, or
As in background technology, i.e., the device shown in Fig. 1 is individually calculated to the grounded screen impedance of grounding net of transformer substation 2.
The impedance ground calculator 6 electrically connected with impedance measurement circuit device 3, the impedance ground calculator 6 also with ground connection
Net impedance measurement device 5 is electrically connected.
Impedance ground calculator 6 is electrically connected with grounded screen impedance measurement device 5 and impedance measurement circuit device 3, energy
The grounded screen for enough being measured with grounded screen impedance measurement device 5 by the impedance loop Rh of the measurement of counter circuit impedance measurement device 3
The difference of impedance Rg, obtains the impedance ground R of independent lightning rod earthing or grounding means 1, and formula is：R=Rh-Rg.
Based on same inventive concept, the embodiment of the present invention additionally provides transformer station's independent lightning rod earthing or grounding means impedance ground
Measuring method, because the corresponding system of method is the transformer station independent lightning rod earthing or grounding means ground connection resistance in the embodiment of the present application
Anti- measuring system, and the principle of method solve problem is similar to system, therefore the enforcement of the method may refer to system
Implement, repeat part and repeat no more.
As shown in fig. 7, the embodiment of the present invention additionally provides a kind of transformer station's independent lightning rod earthing or grounding means impedance ground
Measuring method, the measuring method is used for transformer station's independent lightning rod earthing or grounding means ground connection resistance that Fig. 2 is provided to embodiment illustrated in fig. 6
Anti- measuring system, as shown in fig. 7, measuring method provided in an embodiment of the present invention is comprised the following steps：
S110：Independent lightning rod earthing or grounding means 1 and the sequential series of grounding net of transformer substation 2 are constituted into closed-loop path.
S120：Obtain the grounded screen impedance of grounding net of transformer substation 2.
S130：Electric energy is applied to closed-loop path using test power supply, using impedance measurement circuit device 3 closed-loop path is obtained
Loop voltage and loop current, according to the ratio of loop voltage and loop current calculate closed-loop path impedance loop.
S140：Impedance ground of the difference of counter circuit impedance and grounded screen impedance as independent lightning rod earthing or grounding means 1.
Under normal operating condition, independent lightning rod earthing or grounding means 1 and grounding net of transformer substation 2 are mutually not attached to, first will be only
Vertical lightning rod earthing or grounding means 1 and grounding net of transformer substation 2 are connected, and closed-loop path are formed, then by impedance measurement circuit device 3
It is connected with closed-loop path.Because impedance measurement circuit device 3 includes being connected to the test power supply of closed-loop path, power supply energy is tested
Enough to provide electric energy to closed-loop path, now impedance measurement circuit device 3 obtains the loop voltage of closed-loop path, and measurement stream is closed
The loop current in loop, the then ratio of counter circuit voltage and loop current, you can obtain the impedance loop of closed-loop path, and
The grounded screen impedance of grounding net of transformer substation 2 is known in advance, by counter circuit impedance and the difference of grounded screen impedance, as the independence
The impedance ground of lightning rod earthing or grounding means 1.Wherein, the grounded screen impedance of grounding net of transformer substation 2 can by design drawing or
Preventive test report is obtained.The measurement scheme of the impedance ground of transformer station independent lightning rod earthing or grounding means 1 that the present invention is provided, leads to
Cross independent lightning rod earthing or grounding means 1 and the sequential series of grounding net of transformer substation 2, constitute closed-loop path and measure, it is not necessary to carry on the back
The electric current pole unwrapping wire and voltage pole unwrapping wire of the measurement apparatus mentioned in scape technology, is to close only by impedance measurement circuit device 3
Close loop and test power supply is provided, then closed-loop path can be calculated by the loop voltage and loop current of closed-loop path
Impedance loop, and then would know that the impedance ground of independent lightning rod earthing or grounding means 1.Transformer station's independent lightning rod can be improved to connect
The measurement efficiency of the ground impedance ground of device 1.The technical scheme that the present invention is provided need not be by electric current pole unwrapping wire and voltage pole unwrapping wire
It is positioned over outside transformer station and measures, the man power and material that measurement expends can be reduced.
Wherein, as shown in figure 8, step S130 in embodiment illustrated in fig. 7：Using alien frequencies power supply 31 is tested to closed-loop path
Apply electric energy, using impedance measurement circuit device 3 loop voltage and loop current of closed-loop path obtained, according to loop voltage and
The ratio of loop current calculates the impedance loop of closed-loop path, including：
S131：The test power supply of alien frequencies is produced using the potential winding 321 for being connected to closed-loop path, is produced by closed-loop path
Raw loop voltage and loop current；
S132：By the collecting loop electric current of current coil 322 for being connected to closed-loop path；
S133：Using the counter circuit of impedance loop calculator 3231 electrically connected with potential winding 321 and current coil 322
The ratio of voltage and loop current, as impedance loop.
Pincerlike ground resistance measuring instrument 32 has 322 two coils of potential winding 321 and current coil, potential winding 321
Such as transformer, test power supply (voltage is U) can be provided to closed-loop path, serve as the function of test power supply, so, be closed back
The for example same circuit in road, and loop current I is formed in the closed circuit, loop current I is by pincerlike ground resistance measuring instrument 32
Potential winding 322 gather, be connected with current coil 322 and potential winding 321 by impedance loop calculator 3231, by meter
The ratio U/I of loop voltage and loop current is calculated, you can obtain impedance loop Rh, so as to further measuring and calculating is only according to the loop resistance
The impedance ground of vertical lightning rod earthing or grounding means 1.In addition, the pincerlike ground resistance measuring instrument 32 also includes impedance loop display
3232, shown by the impedance loop of 3232 pairs of measurements of the impedance loop display, enable to operating personnel straight in time
The impedance loop that the closed-loop path is recognized on ground is seen, the convenient impedance ground to independent lightning rod earthing or grounding means 1 is calculated.
Wherein as shown in figure 9, step S130 in embodiment illustrated in fig. 7：Electricity is applied to closed-loop path using test power supply
Can, the loop voltage and loop current of closed-loop path are obtained using impedance measurement circuit device 3, according to loop voltage and loop electricity
The ratio of stream calculates the impedance loop of closed-loop path, including：
S134：Power supply 31 being tested using the alien frequencies for being connected to closed-loop path, electric energy is applied to closed-loop path；
S135：The loop current of closed-loop path is measured using the ammeter 33 for being connected to closed-loop path；
S136：Using be connected to alien frequencies test the two-termial line of power supply 31 and with independent lightning rod earthing or grounding means 1 and transformer station
The voltmeter 34 of the place lines in parallel of grounded screen 2 measures the loop voltage of closed-loop path；
S137：The ratio of counter circuit voltage and loop current, as the impedance loop of closed-loop path.
Ammeter 33 is connected on closed-loop path, can calculate loop current I, and voltmeter 34 is connected to alien frequencies test power supply
31 two-termial lines, and with independent lightning rod earthing or grounding means 1 and the place lines in parallel of grounding net of transformer substation 2, can calculate and be applied to
Loop voltage U of independent lightning rod earthing or grounding means 1 and grounding net of transformer substation 2, by calculate the loop voltage and loop current it
Compare U/I, you can obtain the impedance loop Rh of the closed-loop path.Wherein, ammeter 33 is mountable to alien frequencies test power supply 31 two ends
Main road on, be also mountable on independent lightning rod earthing or grounding means 1 and the place branch road of grounding net of transformer substation 2.
In order to realize the automatic measurement of the impedance ground to independent lightning rod earthing or grounding means 1, as shown in Figure 10, shown in Fig. 7
Step S120：The grounded screen impedance of the grounding net of transformer substation 2 is obtained, including：S121：Using being connected to grounding net of transformer substation 2
Grounded screen impedance measurement device 5 measure the grounded screen impedance of the grounding net of transformer substation 2.
Step S140：The difference of counter circuit impedance and grounded screen impedance connects as the independent lightning rod earthing or grounding means 1
Ground impedance, including：S141：Using with the impedance ground calculator 6 of impedance measurement circuit device 3 calculate the impedance loop with it is described
The difference of the grounded screen impedance of the measurement of grounded screen impedance measurement device 5, hinders as the ground connection of the independent lightning rod earthing or grounding means 1
It is anti-.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiments.
Invention described above embodiment, does not constitute limiting the scope of the present invention.It is any in the present invention
Spirit and principle within modification, equivalent and the improvement made etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground, it is characterised in that include：
Independent lightning rod earthing or grounding means and grounding net of transformer substation, the independent lightning rod earthing or grounding means and the grounding net of transformer substation
Sequential series constitute closed-loop path；
It is connected to the impedance measurement circuit device of the closed-loop path；Wherein, the impedance measurement circuit device includes being connected to
The test power supply of the closed-loop path.
2. the measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground according to claim 1, its feature exists
In the impedance measurement circuit device includes being connected to the pincerlike earth resistance tester of the closed-loop path；
The test power supply of the pincerlike earth resistance tester includes：It is connected to the potential winding of the closed-loop path, the electricity
Line ball circle is used to provide electric energy；
The pincerlike earth resistance tester also includes：
It is connected to the current coil of the closed-loop path；And
The ohmmeter body being electrically connected with the potential winding and the current coil；Wherein,
The ohmmeter body includes being calculated with the impedance loop that the current coil and the potential winding are electrically connected
Device, and the impedance loop display electrically connected with the impedance loop calculator.
3. the measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground according to claim 1, its feature exists
In,
The test power supply includes：It is connected to the alien frequencies test power supply of the closed-loop path；
The impedance measurement circuit device also includes：It is connected to the ammeter of the closed-loop path；It is connected to the test power supply
Two-termial line and with the independent lightning rod earthing or grounding means and the voltmeter of grounding net of transformer substation place lines in parallel.
4. the measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground according to claim 1, its feature exists
In,
The grounding net of transformer substation is connected with the down conductor for extending ground；
The independent lightning rod earthing or grounding means is connected on the ground by wire with the down conductor.
5. the measuring system of transformer station's independent lightning rod earthing or grounding means impedance ground according to claim 1, its feature exists
In also including：
The impedance ground calculator electrically connected with the impedance measurement circuit device.
6. a kind of measuring method of transformer station's independent lightning rod earthing or grounding means impedance ground, it is characterised in that for claim
The measuring system of the transformer station's independent lightning rod earthing or grounding means impedance ground described in 1-5, the measuring method includes：
Independent lightning rod earthing or grounding means and grounding net of transformer substation sequential series are constituted into closed-loop path；
Obtain the grounded screen impedance of the grounding net of transformer substation；
Electric energy is applied to the closed-loop path using test power supply, using impedance measurement circuit device the closed-loop path is obtained
Loop voltage and loop current, according to the ratio of the loop voltage and loop current the impedance loop of the closed-loop path is calculated；
Calculate the impedance ground of the difference as the independent lightning rod earthing or grounding means of the impedance loop and the grounded screen impedance.
7. the measuring method of transformer station's independent lightning rod earthing or grounding means impedance ground according to claim 6, its feature exists
In, it is described that electric energy is applied to the closed-loop path using test power supply, obtain described closure back using impedance measurement circuit device
The loop voltage and loop current on road, according to the ratio of the loop voltage and loop current the loop resistance of the closed-loop path is calculated
It is anti-, including：
Alien frequencies test power supply is produced using the potential winding for being connected to the closed-loop path, loop is produced by the closed-loop path
Voltage and loop current；
The loop current is collected by being connected to the current coil of the closed-loop path；
The loop voltage and loop are calculated using the impedance loop calculator electrically connected with the potential winding and current coil
The ratio of electric current, as the impedance loop.
8. the measuring method of transformer station's independent lightning rod earthing or grounding means impedance ground according to claim 6, its feature exists
In, it is described that electric energy is applied to the closed-loop path using test power supply, obtain described closure back using impedance measurement circuit device
The loop voltage and loop current on road, according to the ratio of the loop voltage and loop current the loop resistance of the closed-loop path is calculated
It is anti-, including：
Power supply being tested using the alien frequencies for being connected to the closed-loop path, electric energy is applied to the closed-loop path；
The loop current of the closed-loop path is measured using the ammeter for being connected to the closed-loop path；
Using be connected to it is described test both ends of power circuit and with the independent lightning rod earthing or grounding means and the substation grounding
The voltmeter of net place lines in parallel measures the loop voltage of the closed-loop path；
The ratio of the loop voltage and the loop current is calculated, as the impedance loop.
9. the measuring method of transformer station's independent lightning rod earthing or grounding means impedance ground according to claim 6, its feature exists
In, the difference of the counter circuit impedance and grounded screen impedance as the independent lightning rod earthing or grounding means impedance ground, including：
The impedance loop is calculated using the impedance ground calculator electrically connected with the impedance measurement circuit device to connect with described
The difference of earth mat impedance, as the impedance ground of the independent lightning rod earthing or grounding means.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110658388A (en) * | 2019-10-11 | 2020-01-07 | 中国铁道科学研究院集团有限公司通信信号研究所 | Detection method and device for ground resistance and electronic equipment |
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Application publication date: 20170510 |