CN106950456A - A kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit - Google Patents
A kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
This application discloses a kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit, including：The very first time and the second time respectively by a test shaft tower of transformer station to be assessed take up an official post a phase line with test shaft tower tower body short circuit；The electric current that always enters the station that the aerial earth wire of the measurement very first time, the second time corresponding transformer station to be assessed shaft tower after tested is flowed into respectively, total outbound electric current and the transformer neutral point electric current of transformer station to be assessed that the aerial earth wires of other shaft towers of transformer station to be assessed flows out；Calculate the first diverting coefficient of grounded screen under the very first time and the grounded screen under the second time diverting coefficient again；Judging grounded screen, whether diverting coefficient relative to ground nets the rate of change of first diverting coefficient less than default rate of change threshold value again；If less than default rate of change threshold value, then judge that the grounded screen performance of transformer station to be assessed meets grounding requirement.The appraisal procedure that the application is provided simply, is easily realized, is not required to measurement of Grounding Resistance, and reliability is high.
Description
Technical field
The application is related to High-Voltage Technology field, more particularly to a kind of grounding net of transformer substation tested based on man-made short-circuit
Can appraisal procedure.
Background technology
Grounding net of transformer substation is to be embedded in multiple metallic ground poles of underground certain depth and for connecting earthing pole and electricity
The network structure earthing or grounding means of the wire composition of gas equipment ground part.Grounding net of transformer substation is not only that various electrical equipments are provided
One public signal reference ground, it is often more important that fault current can be drained rapidly in system jam and ground electricity is reduced
Position rise, thus grounding net of transformer substation ground connection performance quality be directly connected to work of electric power system personnel personal safety and
The safety of various electrical equipments and normal operation.In recent years, due to China's need for electricity rapid growth, power system scale and appearance
Amount is rapid to be expanded, and earth short circuit current is increasing, so as to be proposed to the safe and reliable performance of grounding net of transformer substation higher
It is required that.
At present, the method for assessing grounding net of transformer substation performance is mainly the earth resistance of measurement transformer station.Earth resistance is
Refer to when there is electric current to flow into soil by grounded screen, the resistance presented in soil.The measurement that measurement to earth resistance is generally used
Method is three electrode method.Measuring process is：First, an electric current interpole and earthing or grounding means are set at a certain distance from earthing or grounding means
Form current loop；Then, a voltage interpole is set at a certain distance from earthing or grounding means as measurement earthing or grounding means voltage
Zero potential reference；Finally, by earthing or grounding means Injection Current, the voltage and electric current of earthing or grounding means being measured, according to the two
Ratio determines the earth resistance of earthing or grounding means.
However, because the electric field distortion that electric current interpole more closely causes Injection Current to generate with earthing or grounding means is bigger, voltage
Interpole more closely causes Zero potential reference more inaccurate with earthing or grounding means, therefore, to improve grounding resistance measurement accuracy rate, electricity
Pressure interpole and electric current interpole need to be arranged on from earthing or grounding means remotely, cause measurement to lay up to hundreds of meters or even number
The voltage interpole lead and electric current interpole lead of kilometer, preparation amount are big；Meanwhile, when being measured using three-level method,
The soil texture and soil resistivity of the measured zone constituted to earthing or grounding means, voltage interpole and electric current interpole is also needed to carry out
Measurement, and then earth resistance is assessed, to reduce error, measurement workload is very big.Further, since heavy current tester cost is special
Not expensive, volume is big, does not possess the condition of field conduct substantially, therefore, is injected when being measured using three-level method to earthing or grounding means
Electric current be often a less electric current, the electric current is much smaller than the earth current of actual short failure, it is impossible to real to find to connect
The defect that earth mat occurs.
The content of the invention
This application provides a kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit, to solve power transformation
The problem of grounded screen of standing Performance Evaluation is complicated, reliability is low.
This application provides a kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit, this method bag
Include：
In very first time T1With the second time T2Respectively by a test shaft tower of transformer station to be assessed take up an official post a phase line with
The tower body short circuit of the test shaft tower；
The very first time T is measured respectively1, the second time T2The corresponding transformer station to be assessed is through the test shaft tower
Aerial earth wire flow into the electric current I that always enters the stationw11、Iw12, other shaft towers of transformer station to be assessed aerial earth wire outflow it is total
Outbound electric current Iw21、Iw22With the transformer neutral point electric current I of the transformer station to be assessedN1、IN2；
According toThe transformer station to be assessed is obtained in the very first time T1Under grounded screen it is first
Diverting coefficient k1With in second time T2Under grounded screen diverting coefficient k again2；
Judge grounded screen diverting coefficient k again2The relatively described first diverting coefficient k of grounded screen1Rate of change it is whether small
In default rate of change threshold value；
If less than default rate of change threshold value, then judge that the grounded screen performance of the transformer station to be assessed meets ground connection and wanted
Ask；If greater than or equal to default rate of change threshold value, then judge that the grounded screen performance of the transformer station to be assessed is unsatisfactory for ground connection
It is required that.
Preferably, the predetermined threshold value rate of change p0Size include 20%.
Preferably, the test shaft tower is a shaft tower nearest apart from the transformer station to be assessed.
Preferably, the very first time T1Before formally being come into operation for the transformer station to be assessed.
Preferably, second time T2Any assessment time after being come into operation for the transformer station to be assessed.
The beneficial effect for the grounding net of transformer substation performance estimating method tested based on man-made short-circuit that the application is provided is included：
The grounding net of transformer substation performance estimating method tested based on man-made short-circuit that the application is provided, by becoming to be assessed
The tower body short circuit of a phase line and test shaft tower on one test shaft tower in power station, realizes the short circuit event of simulation transformer station to be assessed
Barrier, the transformer neutral point electricity of the electric current that always enters the station, total outbound electric current and transformer station to be assessed by measuring transformer station to be assessed
Stream, calculates the first diverting coefficient of grounded screen for obtaining transformer station to be assessed, by simulating short trouble and correlation-measuring instrument again
Calculate, obtain the grounded screen of transformer station to be assessed diverting coefficient again, by the first diverting coefficient of grounded screen and grounded screen again
Diverting coefficient carries out comparing calculation, can obtain the short-circuit current separation capacity situation of change of transformer station to be assessed, so that real
Now to the Performance Evaluation of grounding net of transformer substation to be assessed；Evaluation process is not required to measure the earth resistance of transformer station to be assessed, so that
Avoid the problem of measurement of Grounding Resistance preparation in the prior art is complicated, measurement workload is very big, the base that the application is provided
The grounding net of transformer substation performance estimating method tested in man-made short-circuit, appraisal procedure is simple, easily realize.Further, this Shen
The grounding net of transformer substation performance estimating method tested based on man-made short-circuit that please be provide, what it is due to simulation is short trouble, therefore,
The transformer neutral point size of current and reality of the electric current that always enters the station of transformer station to be assessed, total outbound electric current and transformer station to be assessed
The correlated current size of short trouble is close, and the reliability to transformer station's Performance Evaluation to be assessed is high.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the accompanying drawing to be used needed for embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
A kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit that Fig. 1 provides for the embodiment of the present application
Schematic flow sheet；
A kind of grounding net of transformer substation performance evaluation system tested based on man-made short-circuit that Fig. 2 provides for the embodiment of the present application
Structural representation；
Symbol is expressed as：
1- transformers, 2- grounding net of transformer substation, 3-A phase lines, 4-B phase lines, 5-C phase lines, 6- reference test bar tower aerial earth wires, 7-
Other shaft tower aerial earth wires, 8- test shaft towers, 9- portal frames, 10- short circuit leads.
Embodiment
Referring to Fig. 1, commented for a kind of grounding net of transformer substation performance tested based on man-made short-circuit that the embodiment of the present application is provided
The schematic flow sheet of method is estimated, as shown in figure 1, the grounding net of transformer substation tested based on man-made short-circuit that the embodiment of the present application is provided
Performance estimating method, specifically includes following steps：
Step S110：A test shaft tower of transformer station to be assessed is taken up an official post a phase respectively in the very first time and the second time
The tower body short circuit of circuit and test shaft tower.
Specifically, the very first time is preferably transformer station to be assessed come into operation before.Building up input in transformer station to be assessed makes
With it is preceding live testing is carried out to transformer station to be assessed when, outside transformer station to be assessed inlet wire carry out man-made short-circuit's experiment, that is, select
Belong to a shaft tower of transformer station to be assessed as test shaft tower, will test on shaft tower a wherein phase line for three-phase line with
The tower body short circuit of shaft tower is tested, single line shorted to earth failure is simulated.After man-made short-circuit's experiment is carried out, it will be produced on test shaft tower short
Road electric current, the part of short circuit current flow enters ground by testing pole tower ground resistance, another part flow into test shaft tower built on stiltsly
Line, and transformer station to be assessed is flowed into by the aerial earth wire for testing shaft tower, the short circuit current flow for flowing into transformer station to be assessed is designated as
Iw11。
Second time was preferably that transformer station to be assessed came into operation after a period of time.Transformer station to be assessed comes into operation one section
After time, the ground connection performance of its grounded screen is likely to occur decline, influences safe operation and the transformer station's work of transformer station to be assessed
Make the personal safety of personnel, therefore, after a period of time is come into operation in transformer station to be assessed, enter again outside transformer station to be assessed
Line carries out man-made short-circuit's experiment, to realize that the grounded screen Performance Evaluation before being come into operation with transformer station to be assessed is contrasted, obtains
Take transformer station to be assessed after coming into operation with come into operation before grounded screen performance change.It is real that second time carried out man-made short-circuit
The method tested is identical with the method that the very first time carries out man-made short-circuit's experiment, will not be repeated here.Second time carried out artificial short
The short circuit current flow that transformer station to be assessed is flowed into after the experiment of road is designated as Iw12。
Certainly, the very first time and the second time can also select other times respectively, and such as very first time is also chosen as to be assessed
After transformer station comes into operation 1 year, the second time may be selected after transformer station to be assessed comes into operation 3 years etc..
Further, in the embodiment of the present application, the transformer station to be assessed for the raising very first time and the progress of the second time connects
The reliability of earth mat performance change contrast, same shaft tower is as test shaft tower outside prioritizing selection transformer station to be assessed, and preferentially
Same phase line and the tower body short circuit of test shaft tower on selection test shaft tower, and the selection of phase line can be according to the arrangement feelings of triple line
Condition determines that such as triple line is horizontally arranged, and any one phase line may be selected and carries out short circuit, such as triple line is vertical arrangement, optional
Select the phase line nearest apart from ground and carry out short circuit, short circuit position is preferably also same position twice.
Step S120：The measurement very first time, the second time corresponding transformer station to be assessed shaft tower after tested is built on stilts respectively
The electric current I that always enters the station that ground wire is flowed intow11、Iw12, total outbound electric current of the aerial earth wire outflow of other shaft towers of transformer station to be assessed
Iw21、Iw22With the transformer neutral point electric current I of transformer station to be assessedN1、IN2。
Specifically, the very first time corresponding transformer station to be assessed after tested shaft tower aerial earth wire flow into the electric current that always enters the station
As flow into the short circuit current flow I of transformer station to be assessedw11.Flow into the short circuit current flow I of transformer station to be assessedw11First a part warp
The grounded screen of transformer station to be assessed flows into the earth, and this one part of current is designated as grounded screen earth current Ig1；Part II is then flowed to
Aerial earth wire on other shaft towers of transformer station to be assessed, this one part of current is designated as total outbound electric current Iw21；Part III is then flowed to
The transformer of transformer station to be assessed, the neutral point through transformer flows into the earth, and this one part of current is designated as IN1.By above-mentioned short circuit electricity
Flow Iw11Flow to visible, grounded screen earth current Ig11Computing formula be Ig1=Iw11-Iw21-IN1。
Measure the electric current I that always enters the station respectively using current probew11, total outbound electric current Iw21With transformer neutral point electric current IN1,
And further calculate grounded screen earth current Ig1。
The second time corresponding electric current I that always enters the stationw12, total outbound electric current Iw22With transformer neutral point electric current IN2Measurement side
Method measures the electric current I that always enters the station with the very first timew11, total outbound electric current Iw21With transformer neutral point electric current IN1Method it is identical, meter
Calculate corresponding grounded screen earth current Ig2Method with calculating the very first time corresponding grounded screen earth current Ig1Method phase
Together.
Step S130：According toObtain grounded screen of the transformer station to be assessed under the very first time first
Diverting coefficient k1With the diverting coefficient k again of the grounded screen under the second time2。
Specifically, grounded screen diverting coefficient k (including the first diverting coefficient k of grounded screen1With grounded screen diverting coefficient k again2)
The grounded screen of transformer station as to be assessed is for the shunting accounting of short circuit current flow, and the short circuit current flow flow direction analyzed by step S120 can
Release, the first diverting coefficient k of grounded screen of the transformer station to be assessed under the very first time1Computing formula beGrounded screen of the transformer station to be assessed under the second time diverting coefficient k again2Calculating it is public
Formula is
Step S140：Judge grounded screen diverting coefficient k again2Relative to ground net first diverting coefficient k1Rate of change whether
Less than default rate of change threshold value.
Specifically, according to the step S130 first diverting coefficient k of grounded screen1With grounded screen diverting coefficient k again2Calculating
Process understands that grounded screen diverting coefficient k has reacted shunting accounting of the grounded screen for short circuit current flow of transformer station to be assessed, because
This, grounded screen diverting coefficient k change (the first diverting coefficient k of the embodiment of the present application middle finger grounded screen1Shunted again with grounded screen
Coefficient k2Change) change of the grounded screen for the separation capacity of short circuit current flow of transformer station to be assessed can be represented, so as to make
For the important indicator of the grounded screen Performance Evaluation of transformer station to be assessed.
By grounded screen diverting coefficient k again2Relative to ground net first diverting coefficient k1Rate of change be designated as transformer station to be assessed
Grounded screen performance change rate p1, p1Computing formula be：
The default rate of change threshold value p of one transformer station to be assessed is set0.Default rate of change threshold value p0According to Grounding
It is required that be configured, in the embodiment of the present application, preferably predetermined threshold value rate of change p0Size be 20%.In the very first time and second
Time is carried out to transformer station to be assessed after man-made short-circuit's experiment and measurement of correlation calculating, calculates the ground connection for obtaining transformer station to be assessed
Net performance change rate p1, judge p1Whether p is less than0。
Step S150：If less than default rate of change threshold value, then judging the grounded screen performance of the transformer station to be assessed expires
Sufficient grounding requirement.
If specifically, grounded screen performance change rate p1Less than default rate of change threshold value p0, then transformer station to be assessed is shown
Grounded screen performance change is smaller, so as to judge that the grounded screen performance of transformer station to be assessed meets grounding requirement.
Step S160：If greater than or equal to default rate of change threshold value, then the grounded screen of the transformer station to be assessed is judged
Performance meets grounding requirement.
If specifically, grounded screen performance change rate p1More than or equal to default rate of change threshold value p0, then change to be assessed is shown
The grounded screen performance change in power station is larger, i.e., grounded screen performance of the transformer station to be assessed after a period of time of coming into operation is with throwing
Enter the grounded screen performance gap before use larger (normally coupled to ground net hydraulic performance decline amplitude is larger), so as to judge power transformation to be assessed
The grounded screen performance in the second time of standing can not meet grounding requirement, it is necessary to be overhauled.
In the embodiment of the present application, by carrying out man-made short-circuit's experiment and measurement of correlation and calculating to transformer station to be assessed,
The grounded screen Performance Evaluation to transformer station to be assessed can be achieved.Referring to Fig. 2, connect for a kind of transformer station that the embodiment of the present application is provided
The structural representation of earth mat performance evaluation system.As shown in Fig. 2 the grounding net of transformer substation Performance Evaluation that the embodiment of the present application is provided
System, including transformer 1, grounding net of transformer substation 2, A phase lines 3, B phase lines 4, C phase lines 5, test shaft tower 8 aerial earth wire 6, other bars
Tower aerial earth wire 7, test shaft tower 8, portal frame 9 and short circuit lead 10.
Specifically, the test aerial earth wire 6 of shaft tower 8 is connected by portal frame 9 with grounding net of transformer substation 2, on test shaft tower 8
The C phase lines 5 that A phase lines 3, B phase lines 4 and C phase lines 5 are connected on transformer 1, test shaft tower 8 respectively pass through short circuit lead 10 and test
The tower body short circuit of shaft tower 8.Electric current I on the test aerial earth wire 6 of shaft tower 8 is measured by current probe C1w1, pass through current probe C2
Measure the total current I on other shaft tower aerial earth wires 7w2, pass through the neutral point of transformer 1 electricity of current probe C3 measuring transformers 1
Flow IN.Wherein, other shaft tower aerial earth wires 7 include many aerial earth wires, and corresponding current probe C2 quantity is multiple.
Certain transformer station (transformer station to be assessed) before being taken into use, carries out man-made short-circuit's experiment, obtains the electric current I that always enters the stationw11
For 6.2kA, total outbound electric current Iw21For 0.8kA, transformer neutral point electric current is 0.9kA, then can calculate and obtain entering by grounded screen
The electric current I on groundg1For 4.5kA, the initial diverting coefficient k of grounded screen1For 72.6%.After substation operation 5 years, re-start artificial short
The examination of road is tested, and obtains the electric current I that always enters the stationw12For 4.2kA, total outbound electric current Iw22For 1.2kA, transformer neutral point electric current is 1.9kA,
Then enter the electric current I on ground by grounded screeng2For 1.1kA, diverting coefficient is 26.2% to grounded screen again, before being put into operation much smaller than transformer station
Diverting coefficient 72.6%, calculating obtain grounding net of transformer substation performance change rate p1For 63.9%, much larger than default rate of change threshold
Value p0, therefore can determine whether that the substation grounding network is unsatisfactory for grounding requirement, in some instances it may even be possible to there is failure, it is necessary to the transformer station
Further overhauled.
From above-described embodiment as can be seen that the grounding net of transformer substation performance tested based on man-made short-circuit that the application is provided is commented
Estimate method, by the tower body short circuit of a phase line on a test shaft tower by transformer station to be assessed and test shaft tower, realize mould
Intend the short trouble of transformer station to be assessed, by measuring the electric current that always enters the station of transformer station to be assessed, total outbound electric current and to be assessed
The transformer neutral point electric current of transformer station, calculates the first diverting coefficient of grounded screen for obtaining transformer station to be assessed, passes through mould again
Intend short trouble and measurement of correlation to calculate, the grounded screen of transformer station to be assessed diverting coefficient again is obtained, by the beginning of grounded screen
Diverting coefficient carries out comparing calculation again for secondary diverting coefficient and grounded screen, can obtain the short-circuit current point of transformer station to be assessed
Capacity variation situation is flowed, so as to realize the Performance Evaluation to grounding net of transformer substation to be assessed；The application provide based on artificial short
The grounding net of transformer substation performance estimating method of road experiment, evaluation process is not required to measure the earth resistance of transformer station to be assessed, so that
Avoid the problem of measurement of Grounding Resistance preparation in the prior art is complicated, measurement workload is very big, the base that the application is provided
The grounding net of transformer substation performance estimating method tested in man-made short-circuit, appraisal procedure is simple, easily realize.Further, this Shen
The grounding net of transformer substation performance estimating method tested based on man-made short-circuit that please be provide, what it is due to simulation is short trouble, therefore,
The transformer neutral point size of current and reality of the electric current that always enters the station of transformer station to be assessed, total outbound electric current and transformer station to be assessed
The correlated current size of short trouble is close, and the reliability to transformer station's Performance Evaluation to be assessed is high.
Invention described above embodiment is not intended to limit the scope of the present invention..
Claims (5)
1. a kind of grounding net of transformer substation performance estimating method tested based on man-made short-circuit, it is characterised in that including：
In very first time T1With the second time T2Respectively by a test shaft tower of transformer station to be assessed take up an official post a phase line with it is described
Test the tower body short circuit of shaft tower；
The very first time T is measured respectively1, the second time T2Frame of the corresponding transformer station to be assessed through the test shaft tower
The electric current I that always enters the station that vacant lot line is flowed intow11、Iw12, other shaft towers of transformer station to be assessed aerial earth wire outflow it is total outbound
Electric current Iw21、Iw22With the transformer neutral point electric current I of the transformer station to be assessedN1、IN2；
According toThe transformer station to be assessed is obtained in the very first time T1Under grounded screen shunt for the first time
Coefficient k1With in second time T2Under grounded screen diverting coefficient k again2；
Judge grounded screen diverting coefficient k again2The relatively described first diverting coefficient k of grounded screen1Rate of change whether be less than it is pre-
If rate of change threshold value；
If less than default rate of change threshold value, then judge that the grounded screen performance of the transformer station to be assessed meets grounding requirement；
If greater than or equal to default rate of change threshold value, then judge that the grounded screen performance of the transformer station to be assessed is unsatisfactory for ground connection
It is required that.
2. the grounding net of transformer substation performance estimating method according to claim 1 tested based on man-made short-circuit, its feature is existed
In the predetermined threshold value rate of change p0Size include 20%.
3. the grounding net of transformer substation performance estimating method according to claim 1 tested based on man-made short-circuit, its feature is existed
In the test shaft tower is a shaft tower nearest apart from the transformer station to be assessed.
4. the grounding net of transformer substation performance estimating method according to claim 1 tested based on man-made short-circuit, its feature is existed
In the very first time T1Before formally being come into operation for the transformer station to be assessed.
5. the grounding net of transformer substation performance estimating method according to claim 1 tested based on man-made short-circuit, its feature is existed
In second time T2Any assessment time after being come into operation for the transformer station to be assessed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257794A (en) * | 2020-01-20 | 2020-06-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Transformer substation grounding device thermal stability checking method based on conduction test |
| CN111426916A (en) * | 2020-05-14 | 2020-07-17 | 昆明理工大学 | Grounding electrode line fault simulation method and system |
| CN117849446A (en) * | 2024-03-07 | 2024-04-09 | 国网山东省电力公司莱芜供电公司 | Transformer substation ground current detection system, method, electronic equipment and medium |
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Cited By (5)
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| CN111257794A (en) * | 2020-01-20 | 2020-06-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Transformer substation grounding device thermal stability checking method based on conduction test |
| CN111257794B (en) * | 2020-01-20 | 2022-04-12 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Transformer substation grounding device thermal stability checking method based on conduction test |
| CN111426916A (en) * | 2020-05-14 | 2020-07-17 | 昆明理工大学 | Grounding electrode line fault simulation method and system |
| CN111426916B (en) * | 2020-05-14 | 2021-06-25 | 昆明理工大学 | Grounding electrode line fault simulation method and system |
| CN117849446A (en) * | 2024-03-07 | 2024-04-09 | 国网山东省电力公司莱芜供电公司 | Transformer substation ground current detection system, method, electronic equipment and medium |
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Effective date of registration: 20210413 Address after: 650217 No. 105 Yunda West Road, Kunming Economic and Technological Development Zone, Yunnan Province Patentee after: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Address before: 650217 No. 105 Yunda West Road, Kunming Economic and Technological Development Zone, Yunnan Province Patentee before: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Patentee before: TSINGHUA University |