CN106950456B - A kind of grounding net of transformer substation performance estimating method based on man-made short-circuit's experiment - Google Patents
A kind of grounding net of transformer substation performance estimating method based on man-made short-circuit's experiment Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
This application discloses it is a kind of based on man-made short-circuit experiment grounding net of transformer substation performance estimating method, comprising: at the first time and the second time respectively by a test shaft tower of substation to be assessed take up an official post a phase line and test shaft tower tower body short circuit；Respectively measurement at the first time, the electric current that always enters the station that flows into of the aerial earth wire of the second time corresponding substation to be assessed shaft tower after tested, the transformer neutral point electric current of total outbound electric current and substation to be assessed that the aerial earth wires of other shaft towers of substation to be assessed flows out；Calculate the first diverting coefficient of grounded screen under first time and the grounded screen under the second time diverting coefficient again；Judge whether the grounded screen change rate that diverting coefficient is connected to each other the first diverting coefficient of earth mat again is less than default change rate threshold value；If it is less than default change rate threshold value, then determine that the grounded screen performance of substation to be assessed meets grounding requirement.Appraisal procedure provided by the present application is simple, easy to accomplish, is not required to measurement of Grounding Resistance, high reliablity.
Description
Technical field
This application involves High-Voltage Technology field more particularly to a kind of grounding net of transformer substation based on man-made short-circuit's experiment
It can appraisal procedure.
Background technique
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 reticular structure earthing or grounding means of the conducting wire composition of gas equipment ground part.Grounding net of transformer substation is not only that various electrical equipments provide
One public signal is with reference to ground, it is often more important that can drain rapidly fault current in system jam and reduce ground electricity
Position raising, thus grounding net of transformer substation ground connection performance superiority and inferiority be directly related to power system staff personal safety and
The safety and normal operation of various electrical equipments.In recent years, since China's power demand grows at top speed, electric system scale and appearance
Amount expands rapidly, and earth short circuit current is increasing, to propose to the safe and reliable performance of grounding net of transformer substation higher
It is required that.
Currently, the method for assessment grounding net of transformer substation performance is mainly the ground resistance for measuring substation.Ground resistance is
Refer to the resistance when there is electric current to flow into soil by grounded screen, presented in soil.The measurement that the measurement of ground resistance is generallyd use
Method is three electrode method.Measuring process are as follows: firstly, an electric current interpole and earthing or grounding means are arranged at a certain distance from earthing or grounding means
Form current loop；Then, one voltage interpole of setting is used as measurement earthing or grounding means voltage at a certain distance from earthing or grounding means
Zero potential reference；Finally, the voltage and electric current of earthing or grounding means are measured, according to the two by earthing or grounding means Injection Current
Ratio determines the ground resistance of earthing or grounding means.
However, since 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, measures accuracy rate, electricity to improve ground resistance
Press interpole and electric current interpole that setting is needed remotely, to cause measurement that need to be laid with up to hundreds of meters or even count from earthing or grounding means
The voltage interpole lead and electric current interpole lead, preparation amount of kilometer are big；Meanwhile when being measured using three-level method,
The soil texture and soil resistivity for also needing the measured zone formed to earthing or grounding means, voltage interpole and electric current interpole carry out
Measurement, and then ground resistance is assessed, to reduce error, measurement workload is very big.In addition, since heavy current tester cost is special
Not expensive, volume is big, does not have the condition of field conduct substantially, therefore, injects when being measured using three-level method to earthing or grounding means
Electric current be often a lesser electric current, which is much smaller than the earth current of actual short failure, can not really find to connect
The defect that earth mat occurs.
Summary of the invention
This application provides a kind of grounding net of transformer substation performance estimating methods based on man-made short-circuit's experiment, to solve power transformation
The problem that 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 based on man-made short-circuit's experiment, this method packets
It includes:
In first time T1With the second time T2Respectively by a test shaft tower of substation to be assessed take up an official post a phase line with
The tower body of the test shaft tower is shorted；
The first time T is measured respectively1, the second time T2The corresponding substation to be assessed is through the test shaft tower
Aerial earth wire flow into the electric current I that always enters the stationw11、Iw12, the aerial earth wire of other shaft towers of substation to be assessed flows out total
Outbound electric current Iw21、Iw22With the transformer neutral point electric current I of the substation to be assessedN1、IN2；
According toThe substation to be assessed is obtained in the first time T1Under grounded screen at the beginning of
Secondary diverting coefficient k1With in the second time T2Under grounded screen diverting coefficient k again2；
Judge grounded screen diverting coefficient k again2The relatively described first diverting coefficient k of grounded screen1Change rate it is whether small
In default change rate threshold value；
If it is less than default change rate threshold value, then determine that the grounded screen performance of the substation to be assessed meets ground connection and wants
It asks；If it is greater than or equal to default change rate threshold value, then determine that the grounded screen performance of the substation to be assessed is unsatisfactory for being grounded
It is required that.
Preferably, the preset threshold change rate p0Size include 20%.
Preferably, the test shaft tower is a shaft tower nearest apart from the substation to be assessed.
Preferably, the first time T1Before formally coming into operation for the substation to be assessed.
Preferably, the second time T2Any assessment time after coming into operation for the substation to be assessed.
The beneficial effect of grounding net of transformer substation performance estimating method provided by the present application based on man-made short-circuit's experiment includes:
Grounding net of transformer substation performance estimating method provided by the present application based on man-made short-circuit's experiment, by by change to be assessed
A phase line is shorted with the tower body for testing shaft tower on one test shaft tower in power station, realizes the short-circuit event for simulating substation to be assessed
Barrier, by the electric current that always enters the station, total outbound electric current and the transformer neutral point of substation to be assessed electricity that measure substation to be assessed
Stream, is calculated the first diverting coefficient of grounded screen of substation to be assessed, by simulating short trouble and correlation-measuring instrument again
Calculate, obtain the grounded screen of substation to be assessed diverting coefficient again, by the first diverting coefficient of grounded screen and grounded screen again
Diverting coefficient compares calculating, can get the short-circuit current separation capacity situation of change of substation to be assessed, thus real
Now to the Performance Evaluation of grounding net of transformer substation to be assessed；Evaluation process is not required to measure the ground resistance of substation to be assessed, thus
Avoid in the prior art the problem that measurement of Grounding Resistance preparation is complicated, measurement workload is very big, base provided by the present application
In the grounding net of transformer substation performance estimating method of man-made short-circuit's experiment, appraisal procedure is simple, easy to accomplish.Further, this Shen
The grounding net of transformer substation performance estimating method based on man-made short-circuit's experiment that please be provided, what it is due to simulation is short trouble,
The transformer neutral point size of current and reality of the electric current that always enters the station of substation to be assessed, total outbound electric current and substation to be assessed
The correlated current size of short trouble is close, to the high reliablity of substation's Performance Evaluation to be assessed.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of grounding net of transformer substation performance estimating method based on man-made short-circuit's experiment provided by the embodiments of the present application
Flow diagram；
Fig. 2 is a kind of grounding net of transformer substation performance evaluation system based on man-made short-circuit's experiment provided by the embodiments of the present application
Structural schematic diagram；
Symbol is expressed as:
1- transformer, 2- grounding net of transformer substation, 3-A phase line, 4-B phase line, 5-C phase line, 6- reference test bar tower aerial earth wire, 7-
Other shaft tower aerial earth wires, 8- test shaft tower, 9- portal frame, and 10- is shorted lead.
Specific embodiment
It is that a kind of grounding net of transformer substation performance based on man-made short-circuit's experiment provided by the embodiments of the present application is commented referring to Fig. 1
The flow diagram of method is estimated, as shown in Figure 1, the grounding net of transformer substation provided by the embodiments of the present application based on man-made short-circuit's experiment
Performance estimating method, specifically includes the following steps:
Step S110: a test shaft tower of substation to be assessed is being taken up an official post a phase respectively with the second time at the first time
The tower body of route and test shaft tower is shorted.
Specifically, being at the first time preferably before substation to be assessed comes into operation.Building up investment in substation to be assessed makes
With it is preceding live testing is carried out to substation to be assessed when, outside substation to be assessed inlet wire carry out man-made short-circuit's experiment, that is, select
Belong to a shaft tower of substation to be assessed as test shaft tower, will test on shaft tower a wherein phase line for three-phase line with
The tower body for testing shaft tower is shorted, and simulates single line shorted to earth failure.After man-made short-circuit tests progress, it will be generated on test shaft tower short
Road electric current, a part of short circuit current enter ground by testing pole tower ground resistance, another part flow into test shaft tower aerially
Line, and substation to be assessed is flowed by the aerial earth wire of test shaft tower, the short circuit current for flowing into substation to be assessed is denoted as
Iw11。
Second time was preferably that substation to be assessed came into operation after a period of time.Substation to be assessed comes into operation one section
After time, the ground connection performance of grounded screen is likely to occur decline, influences the safe operation and substation's work of substation to be assessed
Make the personal safety of personnel, therefore, after a period of time is come into operation in substation to be assessed, again outside substation to be assessed into
Line carries out man-made short-circuit's experiment, to realize that the grounded screen Performance Evaluation before coming into operation with substation to be assessed compares, obtains
Grounded screen performance change before taking substation to be assessed after coming into operation and coming into operation.It is real that second time carried out man-made short-circuit
The method tested is identical as the first time progress method of man-made short-circuit's experiment, and details are not described herein.Second time carried out artificial short
The short circuit current that substation to be assessed is flowed into after the experiment of road is denoted as Iw12。
Certainly, other times can also be selected respectively with the second time at the first time, be such as also chosen as at the first time to be assessed
After substation comes into operation 1 year, the second time be may be selected after substation to be assessed comes into operation 3 years etc..
Further, it in the embodiment of the present application, is connect at the first time with the substation to be assessed of the second time progress to improve
The reliability of earth mat performance change comparison preferentially selects outside substation to be assessed the same shaft tower as test shaft tower, and preferentially
The tower body of same phase line and test shaft tower on selection test shaft tower is shorted, and the selection of phase line can be according to the arrangement feelings of triple line
Condition determine, as triple line be it is horizontally arranged, any one phase line may be selected and be shorted, if triple line be vertical arrangement, it is optional
It selects the phase line nearest apart from ground to be shorted, is shorted position twice and is preferably also same position.
Step S120: respectively measurement at the first time, the second time corresponding substation to be assessed shaft tower after tested it is aerial
The electric current I that always enters the station that ground wire flows intow11、Iw12, total outbound electric current of the aerial earth wire outflow of other shaft towers of substation to be assessed
Iw21、Iw22With the transformer neutral point electric current I of substation to be assessedN1、IN2。
Specifically, the electric current that always enters the station that the aerial earth wire of corresponding substation to be assessed shaft tower after tested flows at the first time
As flow into the short circuit current I of substation to be assessedw11.Flow into the short circuit current I of substation to be assessedw11First a part warp
The grounded screen of substation to be assessed flows into the earth, this one part of current is denoted as grounded screen earth current Ig1；Second part then flows to
Aerial earth wire on other shaft towers of substation to be assessed, this one part of current are denoted as total outbound electric current Iw21；Part III then flows to
The transformer of substation to be assessed, the neutral point through transformer flow into the earth, this one part of current is denoted as IN1.By above-mentioned short circuit electricity
Flow Iw11Flow direction as it can be seen that grounded screen earth current Ig11Calculation formula be Ig1=Iw11-Iw21-IN1。
The electric current I that always enters the station is measured 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 and first time measure the electric current I that always enters the stationw11, total outbound electric current Iw21With transformer neutral point electric current IN1Method it is identical, meter
Calculate corresponding grounded screen earth current Ig2Method with calculate corresponding grounded screen earth current I at the first timeg1Method phase
Together.
Step S130: according toIt is first to obtain grounded screen of the substation to be assessed under first time
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)
For the grounded screen of substation as to be assessed for the shunting accounting of short circuit current, the short circuit current flow direction analyzed by step S120 can
It releases, the first diverting coefficient k of grounded screen of the substation to be assessed under first time1Calculation formula beGrounded screen of the substation to be assessed under the second time diverting coefficient k again2Calculating it is public
Formula is
Step S140: judge grounded screen diverting coefficient k again2It is connected to each other the first diverting coefficient k of earth mat1Change rate whether
Less than default change rate threshold value.
Specifically, according to the first diverting coefficient k of grounded screen of step S1301With grounded screen diverting coefficient k again2Calculating
Process it is found that grounded screen diverting coefficient k has reacted shunting accounting of the grounded screen for short circuit current of substation to be assessed, because
This, variation (the first diverting coefficient k of the embodiment of the present application middle finger grounded screen of grounded screen diverting coefficient k1It is shunted again with grounded screen
Coefficient k2Variation) variation of the grounded screen of substation to be assessed for the separation capacity of short circuit current can be represented, so as to make
For the important indicator of the grounded screen Performance Evaluation of substation to be assessed.
By grounded screen diverting coefficient k again2It is connected to each other the first diverting coefficient k of earth mat1Change rate be denoted as substation to be assessed
Grounded screen performance change rate p1, p1Calculation formula are as follows:
The default change rate threshold value p of one substation to be assessed is set0.Default change rate threshold value p0According to Grounding
It is required that be configured, in the embodiment of the present application, preferably preset threshold change rate p0Size be 20%.In first time and second
After time carries out man-made short-circuit's test and measurement of correlation calculating to substation to be assessed, the ground connection of substation to be assessed is calculated
Net performance change rate p1, judge p1Whether p is less than0。
Step S150: if it is less than default change rate threshold value, then determine that the grounded screen performance of the substation to be assessed is full
Sufficient grounding requirement.
Specifically, if grounded screen performance change rate p1Less than default change rate threshold value p0, then show substation to be assessed
Grounded screen performance change is smaller, therefore, it is determined that the grounded screen performance of substation to be assessed meets grounding requirement.
Step S160: if it is greater than or equal to default change rate threshold value, then determine the grounded screen of the substation to be assessed
Performance meets grounding requirement.
Specifically, if grounded screen performance change rate p1More than or equal to default change rate threshold value p0, then show change to be assessed
The grounded screen performance change in power station is larger, i.e., grounded screen performance of the substation to be assessed after a period of time of coming into operation with throwing
Grounded screen performance gap before entering use is larger (normally coupled to ground net performance declines by a big margin), therefore, it is determined that power transformation to be assessed
The grounded screen performance in the second time of standing is no longer satisfied grounding requirement, is overhauled.
In the embodiment of the present application, by carrying out man-made short-circuit's experiment and measurement of correlation and calculating to substation to be assessed,
The grounded screen Performance Evaluation to substation to be assessed can be achieved.It referring to fig. 2, is that a kind of substation provided by the embodiments of the present application connects
The structural schematic diagram of earth mat performance evaluation system.As shown in Fig. 2, grounding net of transformer substation Performance Evaluation provided by the embodiments of the present application
System, including transformer 1, grounding net of transformer substation 2, A phase line 3, B phase line 4, C phase line 5, test 8 aerial earth wire 6 of shaft tower, other bars
Tower aerial earth wire 7, test shaft tower 8, portal frame 9 and short circuit lead 10.
Specifically, test 8 aerial earth wire 6 of shaft tower is connect by portal frame 9 with grounding net of transformer substation 2, test on shaft tower 8
A phase line 3, B phase line 4 and C phase line 5 are separately connected transformer 1, test the C phase line 5 on shaft tower 8 by being shorted lead 10 and test
The tower body of shaft tower 8 is shorted.The electric current I on test 8 aerial earth wire 6 of shaft tower 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 transformer 1 neutral point electricity of current probe C3 measuring transformer 1
Flow IN.Wherein, other shaft tower aerial earth wires 7 include more aerial earth wires, and the quantity of corresponding current probe C2 is multiple.
Certain substation (substation to be assessed) before being put into use, carries out man-made short-circuit's experiment, always entered the station electric current Iw11
For 6.2kA, total outbound electric current Iw21For 0.8kA, transformer neutral point electric current is 0.9kA, then can be calculated to enter by grounded screen
The electric current I on groundg1For 4.5kA, the initial diverting coefficient k of grounded screen1It is 72.6%.After substation operation 5 years, re-start artificial short
Road test is tested, and always entered the station electric current Iw12For 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%, before putting into operation much smaller than substation to grounded screen again
Diverting coefficient 72.6%, grounding net of transformer substation performance change rate p is calculated1It is 63.9%, much larger than default change rate 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 are failure, need to the substation
Further overhauled.
From above-described embodiment as can be seen that the grounding net of transformer substation performance provided by the present application based on man-made short-circuit's experiment is commented
Estimate method, is shorted by the tower body of a phase line on a test shaft tower by substation to be assessed and test shaft tower, realizes mould
The short trouble for intending substation to be assessed passes through the electric current that always enters the station, the total outbound electric current and to be assessed for measuring substation to be assessed
The transformer neutral point electric current of substation is calculated the first diverting coefficient of grounded screen of substation to be assessed, passes through mould again
Quasi- short trouble and measurement of correlation calculate, and the grounded screen of substation to be assessed diverting coefficient again are obtained, by the beginning of grounded screen
Diverting coefficient compares calculating again for secondary diverting coefficient and grounded screen, can get the short-circuit current point of substation to be assessed
Capacity variation situation is flowed, to realize the Performance Evaluation to grounding net of transformer substation to be assessed；It is provided by the present application based on artificial short
The grounding net of transformer substation performance estimating method of road experiment, evaluation process are not required to measure the ground resistance of substation to be assessed, thus
Avoid in the prior art the problem that measurement of Grounding Resistance preparation is complicated, measurement workload is very big, base provided by the present application
In the grounding net of transformer substation performance estimating method of man-made short-circuit's experiment, appraisal procedure is simple, easy to accomplish.Further, this Shen
The grounding net of transformer substation performance estimating method based on man-made short-circuit's experiment that please be provided, what it is due to simulation is short trouble,
The transformer neutral point size of current and reality of the electric current that always enters the station of substation to be assessed, total outbound electric current and substation to be assessed
The correlated current size of short trouble is close, to the high reliablity of substation's Performance Evaluation to be assessed.
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 based on man-made short-circuit's experiment characterized by comprising
In first time T1With the second time T2Respectively by a test shaft tower of substation to be assessed take up an official post a phase line with it is described
The tower body for testing shaft tower is shorted；
The first time T is measured respectively1, the second time T2Frame of the corresponding substation to be assessed through the test shaft tower
The electric current I that always enters the station that vacant lot line flows intow11、Iw12, the aerial earth wire of other shaft towers of substation to be assessed flows out total outbound
Electric current Iw21、Iw22With the transformer neutral point electric current I of the substation to be assessedN1、IN2；
According toThe substation to be assessed is obtained in the first time T1Under grounded screen divide for the first time
Flow coefficient k1, according toThe substation to be assessed is obtained in the second time T2Under grounded screen
Diverting coefficient k again2；
Judge grounded screen diverting coefficient k again2The relatively described first diverting coefficient k of grounded screen1Change rate whether be less than it is pre-
If change rate threshold value；
If it is less than default change rate threshold value, then determine that the grounded screen performance of the substation to be assessed meets grounding requirement；
If it is greater than or equal to default change rate threshold value, then determine that the grounded screen performance of the substation to be assessed is unsatisfactory for being grounded
It is required that.
2. the grounding net of transformer substation performance estimating method according to claim 1 based on man-made short-circuit's experiment, feature exist
In the preset threshold change rate p0Size include 20%.
3. the grounding net of transformer substation performance estimating method according to claim 1 based on man-made short-circuit's experiment, feature exist
In the test shaft tower is a shaft tower nearest apart from the substation to be assessed.
4. the grounding net of transformer substation performance estimating method according to claim 1 based on man-made short-circuit's experiment, feature exist
In the first time T1Before formally coming into operation for the substation to be assessed.
5. the grounding net of transformer substation performance estimating method according to claim 1 based on man-made short-circuit's experiment, feature exist
In the second time T2Any assessment time after coming into operation for the substation to be assessed.
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| 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 |
| 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 |