CN110609207A - T-connection line fault distance measurement method - Google Patents
T-connection line fault distance measurement method Download PDFInfo
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- 238000000691 measurement method Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 239000013307 optical fiber Substances 0.000 claims abstract description 9
- 230000002159 abnormal effect Effects 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 3
- 238000004422 calculation algorithm Methods 0.000 description 13
- 238000004088 simulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses a T-junction line fault location method, which comprises the steps of adopting a T point compensation voltage to identify a fault branch when an optical fiber channel is normal; when the optical fiber channel is abnormal, identifying a fault branch by adopting a three-terminal fault distance measurement result; then determining the three-terminal fault clearing time according to the relation between the minimum fault current value and the set maximum fault current threshold value; and after the fault is removed, calculating a fault location per unit value according to a single-ended location method, and converting the fault location per unit value into the distance from the fault point to the T point. The invention is used in the existing line protection device, and for the T-connection line, the distance measurement can still be normally carried out when the communication of the pilot channel is abnormal, and the distance measurement precision can be ensured particularly when the single-phase high-resistance earth fault occurs.
Description
Technical Field
The invention relates to a T-connection line fault distance measurement method, and belongs to the technical field of relay protection of power systems.
Background
At present, the fault location algorithm applied to the power transmission line mainly comprises: single-ended ranging algorithms and double-ended ranging algorithms. For a double-end ranging algorithm, the method is only suitable for a double-end system, and for a T-connection line (a three-end system), the principle of the double-end ranging algorithm is not suitable; for a single-end fault location algorithm, general metallic faults can be accurately located only by a line at one end, and fault location results are inaccurate due to the existence of shunt branches at the other two ends. For the fault location algorithm of the T-connection line, the common algorithm of some traveling wave methods and wave impedance methods researched at present has large calculation amount or complex principle and difficult engineering. The Yaoliang and the like propose a method for identifying a fault branch by using a T-point compensated voltage and then determining a fault point by using a single-ended fault location algorithm in a self-adaptive fault location method applied to a T-junction circuit, the principle is simple, the calculated amount is small, and the method is suitable for engineering, but the distance measurement result of the method is greatly influenced by a transition resistor, and the area selection result is seriously dependent on three-terminal synchronous data.
Disclosure of Invention
The invention aims to provide a T-connection line fault location method which is used in the existing line protection device, can improve the fault location capability under the abnormal conditions of error codes and the like due to inconsistency of optical fiber channel lines, and has high location precision during high-resistance ground fault location.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a T-junction line fault distance measurement method is suitable for lines with 110kV and the following voltage levels, and comprises the following steps:
performing fault selection, including:
when the optical fiber channel is normal, identifying a fault branch by adopting a T point compensation voltage;
when the optical fiber channel is abnormal, fault location is carried out, and then a fault branch is identified by adopting a three-terminal fault location result;
after the trouble district selection, carry out trouble range finding, include:
excluding the non-power supply side according to a device control word 'throw weak feed side';
after the T-connection circuit has the fault protection device, comparing fault currents measured by all power supply sides, and identifying one end with the minimum fault current;
determining the three-terminal fault clearing time according to the relation between the minimum fault current value and the maximum fault current threshold value;
and after the fault is removed, calculating a fault distance measurement per unit value.
Further, the identifying the faulty branch by using the three-terminal fault location result includes:
when the fault location per unit value at one end is less than 1.00 and the fault location per unit values at the other two ends are greater than 1.00, determining the end with the smallest fault location per unit value as a fault branch;
when the per unit value of the minimum fault distance measurement is larger than 1.00 and the per unit value of the maximum fault distance measurement is smaller than 1.05, determining that a fault point is at a point T;
when the above conditions are not met, the fault selection fails.
Furthermore, the control word of 'throwing weak feedback side' is '1' and is the pure load side, and the fixed value of throwing weak feedback side is '0' and is the power supply side.
Further, the maximum fault current threshold value can bear continuous 200ms maximum fault current setting according to the system.
Further, the determining the three-terminal fault clearing time according to the relationship between the minimum fault current value and the maximum fault current threshold value includes:
if the minimum fault current value is smaller than the maximum fault current threshold value, one side of the minimum fault current value is a rear-cut side, the fault is removed during the rear-cut side, and the fault is instantaneously removed after the T-connection line differential protection action is carried out on the other two ends;
and if the minimum fault current value is larger than the maximum fault current threshold value, the three ends quickly trip after the T-connection line differential protection action.
Further, the fault removal time during the rear cutting side extension is as follows: and +20ms after the fault current disappears at the other two ends.
Further, calculating the fault location per unit value by using a single-ended location method comprises:
wherein k is a fault location per unit value,is a fault phase voltage at the m side of the power transmission line,for the m-side fault phase current of the transmission line,is the zero sequence current of the m-side fault of the power transmission line,is composed ofConjugation of (a) to (b), ZlIs the full-length positive sequence impedance of the transmission line, Z0lThe impedance is the full-length zero-sequence impedance of the transmission line.
The invention achieves the following beneficial effects:
the invention provides a T-connection line fault distance measurement method which is used in the existing line protection device and can still normally measure the distance of a T-connection line when the communication of a pilot channel is abnormal, and especially can ensure the distance measurement precision when a single-phase high-resistance earth fault occurs.
Drawings
FIG. 1 is a schematic diagram of a T-junction circuit partition according to the present invention;
FIG. 2 is a diagram of a fault selection technique route in the present invention;
FIG. 3 is a diagram of a fault location technique route according to the present invention;
FIG. 4 is a RTDS simulation model in an embodiment of the invention.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The embodiment of the invention provides a T-junction line fault location method which is mainly divided into two parts, wherein the first part is a fault area selection method, and the second part is a fault location method.
The selection of the fault area is to determine the range of the fault point in which line, as shown in fig. 1, the line M-T is the area 1, the line N-T is the area 2, and the line P-T is the area 3. Here, M, N, and P are three substations on the T-junction line, and the T-point is an intersection of three lines.
The fault selection area of the T-connection circuit mainly depends on three-terminal electrical quantity, and therefore is closely related to the communication state of the optical fiber channel. The fault area selection method is as shown in FIG. 2:
when the fiber channel is normal, the T point compensation voltage is used for identifying the fault branch, and the method specifically comprises the following steps:
respectively calculating the positive sequence voltage of the point T along three branch circuits of M-T, N-T, P-T
Wherein:for positive sequence voltage and current on each side, Zmt、Znt、ZptIs the positive sequence impedance value of each side branch.
The absolute value of the subtraction of every two positive sequence voltages of the three T-junctions is taken as the voltage difference, and is expressed as:
if MIN (Δ U)mnt,ΔUmpt,ΔUnpt)＝ΔUmntIf the branch P-T is a fault branch, the current injected into the fault branch at the point T is
If MIN (Δ U)mnt,ΔUmpt,ΔUnpt)＝ΔUmptIf the branch N-T is a fault branch, the current injected into the fault branch at the point T is
If MIN (Δ U)mnt,ΔUmpt,ΔUnpt)＝ΔUnptIf the branch M-T is a fault branch, the current injected into the fault branch at the point T is
If Δ Umnt≈ΔUmpt≈ΔUnptIf yes, the fault is judged to be a T point fault.
The technical scheme of the T point compensation voltage identification fault branch circuit comes from the following steps: yao liang, chen fufeng, chenqi, a self-adaptive fault location method applied to a T-junction line, protection and control of an electric power system, 2012, 40 (3): 26-30.
When the optical fiber channel is abnormal (the channel has inconsistent routing and serious error code), the fault location length is directly calculated by using a single-end location algorithm, and then the fault branch is identified by using a three-end fault location result:
when the fault location per unit value (fault location length/line setting length) of one end is less than 1.00 and the other two ends are more than 1.00, determining the end with the smallest fault location per unit value as a fault branch;
when the per unit value of the minimum fault distance measurement is larger than 1.00 and the per unit value of the maximum fault distance measurement is smaller than 1.05, determining that a fault point is near a point T;
and when the conditions are not met, reporting that the fault selection fails.
The distance measurement algorithm of the embodiment of the invention is mainly suitable for the lines with the voltage class of 110kV and below, and provides an improved T-line distance measurement algorithm on the premise of ensuring the stability of a system and not damaging primary equipment, and the distance measurement algorithm is as follows in detail with reference to FIG. 3:
setting a maximum fault current threshold value Idelay_setThe fixed value can bear continuous 200ms maximum fault current setting according to the system.
Before fault location, according to a device control word 'throw weak feed side', eliminating a non-large power supply side: the control word of 'feeding weak feed side' is '1' and is the pure load side, and the constant value of '0' of feeding weak feed side is the power supply side.
And after the fault protection device acts on the line, comparing the fault currents measured by all power supply sides, and identifying the end with the minimum fault current.
Judging whether the minimum value of the fault current is less than the threshold value (I) of the maximum fault currentdelay_set)，
If the judgment condition is not met, the probability of the occurrence of the ground fault through the large excess resistor is small, the three-terminal protection device quickly trips after the T-connection line differential protection action, and the single-terminal distance measurement method is directly used for distance measurement.
If the judgment condition is met, determining that the side is a rear-cut side, removing the fault during the rear-cut side, and instantaneously isolating the fault after the differential protection action of the T-connection line at the other two ends; the fault removal time during the back cut side extension is as follows: and +20ms after the fault current disappears at the other two ends.
After the T-connection line differential protection action, the fault isolation time of the fast switching side is as follows: the protection action time is 30ms + the switch tripping time is 60 ms;
the post-cut side fault isolation time is as follows: the fault isolation time of the fast switching side is 90ms + the protection delay action time is 20ms + the switch tripping time is 60 ms.
Finally, the rear cutting side opening and closing time is 170ms and is less than the set 200 ms.
The fast switching side is the side where the fault is isolated immediately after the protection device acts, and the backward switching side is the side where the fault is isolated after a period of time delay after the protection device acts.
After the back cut side cuts off the fault, the back cut side calculates the per unit value of the fault location by adopting a single-end location method:
since the fast-switching sides are all isolated from the fault, the current flows through RgThe comprehensive zero-sequence current is shown as the formula (2):
formula (1) simultaneous multiplication of both sides of the equation(vector quantity)Conjugate) and calculating to obtain a fault location per unit value k after the imaginary part is taken:
wherein,is a fault phase voltage at the m side of the power transmission line,for the m-side fault phase current of the transmission line,is the zero sequence current of the m-side fault of the power transmission line,for a fault zero-sequence current of n side of the transmission line, ZlIs the full-length positive sequence impedance of the transmission line, Z0lFor full-length zero-sequence impedance, R, of the transmission linegIs a fault point transition resistance.
Examples
An RTDS simulation model as shown in FIG. 4 is established, and model parameters are as shown in Table 1:
TABLE 1 model parameters
| Item | Parameter(s) | Unit of |
| Positive sequence resistor | 0.147 | Ω/km |
| Positive sequence inductive reactance | 0.430 | Ω/km |
| Positive sequence parallel capacitive reactance | 0.530 | MΩ*km |
| Zero sequence resistance | 0.500 | Ω/km |
| Zero sequence inductive reactance | 1.200 | Ω/km |
| Zero sequence parallel capacitive reactance | 0.786 | MΩ*km |
| Line length MT (zone 1) | 20 | km |
| Line length NT (zone 2) | 30 | km |
| Line length PT (zone 3) | 40 | km |
Simulating a fault point K1 at a position 50% away from the M side, wherein the theoretical T point distance measurement result is 20 × 0.5-10 kM; simulating a fault point K2 at a position 50% away from the N side, wherein the theoretical T point distance measurement result is 30 × 0.5-15 kM; the simulated fault point K3 has a fault 30% away from the P side, and the theoretical T point measurement result is 40 × 0.7-28 kM.
1) In a three-terminal system (a large power supply side, a small power supply side and a load side), the impedance ranging comparison between the traditional impedance ranging method and the impedance ranging method is adopted, and the results are shown in the following table 2:
TABLE 2 impedance ranging results contrast-1
2) Three-terminal system (big power supply side, little power supply side), adopt traditional impedance range finding and the impedance range finding contrast of this patent, the result is as following table 3:
TABLE 3 comparison of impedance ranging results-2
Comparing the distance measurement results of the simulation result table 2 and the simulation result table 3, for different system wiring modes (the three ends of the table 2 are both a power system and a load mixed three-end system of the table 3), the distance measurement method provided by the invention can accurately measure the distance, compared with the traditional single-end distance measurement method and the distance measurement method provided by the invention, the distance measurement precision is basically the same when the metal fault occurs (white bottom data), but when the high-resistance earth fault occurs (grey bottom data), the distance measurement method can accurately measure the distance, and the traditional single-end distance measurement method has large distance measurement error or even cannot measure the distance (the result is used/represented).
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A T-connection line fault distance measurement method is suitable for lines with 110kV and the following voltage levels, and is characterized by comprising the following steps:
performing fault selection, including:
when the optical fiber channel is normal, identifying a fault branch by adopting a T point compensation voltage;
when the optical fiber channel is abnormal, fault location is carried out, and then a fault branch is identified by adopting a three-terminal fault location result;
after the trouble district selection, carry out trouble range finding, include:
excluding the non-power supply side according to a device control word 'throw weak feed side';
after the T-connection circuit has the fault protection device, comparing fault currents measured by all power supply sides, and identifying one end with the minimum fault current;
determining the three-terminal fault clearing time according to the relation between the minimum fault current value and the maximum fault current threshold value;
and after the fault is removed, calculating a fault distance measurement per unit value.
2. The T-line fault location method of claim 1, wherein said identifying the faulty branch using three-terminal fault location results comprises:
when the fault location per unit value at one end is less than 1.00 and the fault location per unit values at the other two ends are greater than 1.00, determining the end with the smallest fault location per unit value as a fault branch;
when the per unit value of the minimum fault distance measurement is larger than 1.00 and the per unit value of the maximum fault distance measurement is smaller than 1.05, determining that a fault point is at a point T;
when the above conditions are not met, the fault selection fails.
3. The T-connection line fault distance measurement method according to claim 1, wherein the control word "1" on the weak feed side is the pure load side, and the constant value "0" on the weak feed side is the power side.
4. A T-line fault location method according to claim 1, wherein said maximum fault current threshold is capable of withstanding 200ms continuous maximum fault current settings based on the system.
5. The method as claimed in claim 1, wherein the determining a three-terminal fault clearing time according to the relation between the fault current minimum value and the maximum fault current threshold value comprises:
if the minimum fault current value is smaller than the maximum fault current threshold value, one side of the minimum fault current value is a rear-cut side, the fault is removed during the rear-cut side, and the fault is instantaneously removed after the T-connection line differential protection action is carried out on the other two ends;
and if the minimum fault current value is larger than the maximum fault current threshold value, the three ends quickly trip after the T-connection line differential protection action.
6. The T-connection line fault location method according to claim 5, wherein the fault removal time during the back-cut side is as follows: and +20ms after the fault current disappears at the other two ends.
7. The method for fault location of a T-junction circuit according to claim 1, wherein the calculation of the fault location per unit value by using a single-ended location method comprises:
wherein k is a fault location per unit value,is a fault phase voltage at the m side of the power transmission line,for the m-side fault phase current of the transmission line,is the zero sequence current of the m-side fault of the power transmission line,is composed ofConjugation of (a) to (b), ZlIs the full-length positive sequence impedance of the transmission line, Z0lThe impedance is the full-length zero-sequence impedance of the transmission line.
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Cited By (3)
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| CN112269144A (en) * | 2020-10-14 | 2021-01-26 | 西安热工研究院有限公司 | Line single-phase earth fault positioning method for wind power generation and transmission system |
| CN112595930A (en) * | 2020-12-18 | 2021-04-02 | 国网河北省电力有限公司 | Backup protection method for petal type urban power grid area containing distributed power supply |
| CN116953383A (en) * | 2023-05-16 | 2023-10-27 | 国电南瑞科技股份有限公司 | Automatic line protection testing method and system capable of simulating abnormality of optical fiber channel |
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| CN116953383A (en) * | 2023-05-16 | 2023-10-27 | 国电南瑞科技股份有限公司 | Automatic line protection testing method and system capable of simulating abnormality of optical fiber channel |
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