CN105896486A - Composite voltage protection method for non-phase interline earth fault of double-circuit lines based on zero sequence current actual measurement of adjacent lines - Google Patents
Composite voltage protection method for non-phase interline earth fault of double-circuit lines based on zero sequence current actual measurement of adjacent lines Download PDFInfo
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- CN105896486A CN105896486A CN201610186405.8A CN201610186405A CN105896486A CN 105896486 A CN105896486 A CN 105896486A CN 201610186405 A CN201610186405 A CN 201610186405A CN 105896486 A CN105896486 A CN 105896486A
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- 239000002131 composite material Substances 0.000 title claims abstract description 7
- 238000005259 measurement Methods 0.000 title claims abstract description 7
- 230000009471 action Effects 0.000 claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims abstract description 7
- 230000006978 adaptation Effects 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000007704 transition Effects 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
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- PYIHTIJNCRKDBV-UHFFFAOYSA-L trimethyl-[6-(trimethylazaniumyl)hexyl]azanium;dichloride Chemical group [Cl-].[Cl-].C[N+](C)(C)CCCCCC[N+](C)(C)C PYIHTIJNCRKDBV-UHFFFAOYSA-L 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
-
- 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 composite voltage protection method for a non-phase interline earth fault of double-circuit lines based on zero sequence current actual measurement of adjacent lines. The method includes the steps of measuring the fault phase voltage, fault phase voltage abrupt change, fault phase current, fault phase current abrupt change, zero sequence current and two fault phase voltage at the protection installation part of a circuit line I of double parallel-circuit lines on same tower, calculating the zero sequence phase angle, zero sequence current of a circuit line II, calculating the fault phase voltage of the circuit line I under normal operation, and determining whether the fault phase voltage abrupt change amplitude at the protection setting scope of the circuit line I is smaller than the fault phase voltage amplitude of the circuit line I under normal operation so as to decide whether to send trip-out signals or not. Only the electrical amount of single-end single circuit line is used, and the method is good in adaptation capability. The influence of interline zero sequence mutual inductance on protection action performance is eliminated, and the hardware design of a protective relaying device is simplified. No protection dead zone for a non-phase interline earth fault in a positive outlet exists, and error action of a non-phase interline earth fault in a reverse outlet is prevented.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a double-circuit line non-homonymous phase overline ground fault compound voltage protection method based on adjacent line zero sequence current actual measurement.
Background
The double-circuit line on the same tower has the advantages of small occupied area, low manufacturing cost and stable and reliable operation of connecting a power grid, and becomes a common power transmission line connecting mode of a power system. Zero sequence mutual inductance exists between double-circuit lines on the same tower, the zero sequence mutual inductance influences a zero sequence compensation coefficient, additional impedance is further generated, the additional impedance caused by the zero sequence mutual inductance can cause the fault impedance measured by a protection device to be larger than the actual fault impedance, and when ground fault occurs at a position close to a protection setting range in a protection area of the double-circuit lines on the same tower, misoperation occurs in protection, and safety and stability operation of a power grid are not facilitated.
Even if the double-circuit line on the same tower is directly grounded through a tower, the transition resistance is near 10 omega in the area with lower soil resistivity; the transition resistance may reach 30 omega, or even higher, where the resistivity is higher. The transition resistance is not zero so that the fault impedance calculated by the protection device comprises an additional impedance generated by the transition resistance in addition to a fault impedance component reflecting the real fault distance. The additional impedance generated by the transition resistance is resistive-inductive or resistive-capacitive, which easily causes the earth impedance distance protection to reject or exceed a steady state. Protection malfunction or failure brings great loss to the safe operation of the power system, and even possibly threatens the stability of the power system.
The boundary of an action characteristic circle of the existing double-circuit line grounding distance protection on the same tower passes through the origin of coordinates, the origin of coordinates is positioned on the boundary of the action characteristic circle, dead zones exist in the protection process of protecting the forward outlet grounding fault, and the dead zones of the forward outlet are protected to be larger along with the increase of transition resistance and load current. Because the origin of coordinates is located on the boundary of the action characteristic circle, the protection of the ground fault of the reverse direction outlet has the possibility of false operation, and the larger the transition resistance is, the more the protection is easy to false operation when the ground fault of the reverse direction outlet is protected.
Because strong zero sequence mutual inductance exists between the double-circuit lines on the same tower, the existing single-phase grounding distance protection cannot acquire the zero sequence current of the other circuit line, the influence of the zero sequence mutual inductance between the lines cannot be eliminated in an algorithm model, and the influence of the zero sequence mutual inductance between the lines is received.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a double-circuit line non-homonymous phase overline ground fault composite voltage protection method based on adjacent line zero sequence current actual measurement, which can protect non-homonymous phase overline ground faults at an opposite direction outlet from false operation, does not need to memorize the voltage before line faults, does not need to set a voltage holding loop before line faults, simplifies the hardware design of a relay protection device, and has no influence on the action performance by line zero sequence mutual inductance, transition resistance and load current.
In order to achieve the purpose, the invention adopts the following technical scheme:
the double-circuit line non-same-name-phase overline ground fault composite voltage protection method based on adjacent line zero sequence current actual measurement is characterized by comprising the following sequential steps of:
(1) the protection device measures the fault phase voltage at the protection installation position of the I-loop circuit of the double-loop circuit on the same towerSudden change of fault phase voltageFault phase currentPhase current break amount of faultAnd zero sequence currentMeasuring two-fault phase voltage at I-loop circuit protection installation position of double-loop circuit on same towerWherein phi rho is an I loop line ACB phase, an I loop line BAC phase and an I loop line CBA phase;
(2) the protection device calculates the zero-sequence current phase angle alpha of the II-loop line of the double-loop line on the same tower:
α＝r1+r2-π-β
wherein, Zmzero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved; zI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; phi rho is an I loop line ACB phase, an I loop line BAC phase and an I loop line CBA phase;
(3) the protection device calculates the zero sequence current of the II-loop line of the double-loop line on the same tower
(4) The protection device calculates phi phase voltage of I-loop circuit of double-loop circuit on the same tower during normal operationWherein phi rho is an I loop line ACB phase, an I loop line BAC phase and an I loop line CBA phase;
(5) protection device judgmentIf yes, judging that the cross-line ground fault point with the same phase is positioned atIn the I-loop circuit protection setting range of the double-loop circuit on the same tower, the protection device sends an action trip signal; wherein lsetProtecting and setting a range for a circuit I of a double-circuit line on the same tower; l is the length of the I loop of the double-loop line on the same tower; zI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; zmThe zero sequence mutual inductance is the zero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower.
The invention has the characteristics and technical achievements that:
the method only uses the single-end single-loop line electric quantity, does not need to introduce another loop line electric quantity, has no influence on the action performance by the operation mode of the power system, and has strong adaptability when the operation mode of the power system is greatly changed. The method of the invention takes the influence of the zero sequence mutual inductance between the lines into account, and eliminates the influence of the zero sequence mutual inductance between the lines on the performance of the protection action. The method of the invention does not need to memorize the voltage before the line fault and set the voltage holding loop before the line fault, thereby simplifying the hardware design of the relay protection device. The action characteristic circle of the method passes through the third quadrant, the origin of coordinates is positioned in the action characteristic circle, no protection dead zone exists when the non-same-name-phase overline ground fault of the forward outlet is protected, and the non-same-name-phase overline ground fault of the reverse outlet is protected from misoperation. The method has the advantages that the action characteristic is transient action characteristic in two cycles after the double-circuit line non-same-name-phase overline ground fault, and the method has strong capability of resisting the influence of transition resistance and load current.
Drawings
Fig. 1 is a schematic diagram of a double-circuit power transmission system on the same tower and with the application of the invention.
Detailed Description
FIG. 1 is a parallel rack on the same tower to which the present invention is appliedSchematic diagram of a double-circuit power transmission system. The protection device measures the fault phase voltage at the protection installation position of the I-loop circuit of the double-loop circuit on the same towerSudden change of fault phase voltageFault phase currentPhase current break amount of faultAnd zero sequence currentMeasuring two-fault phase voltage at I-loop circuit protection installation position of double-loop circuit on same towerWherein, phi rho is an I-loop ACB phase, an I-loop BAC phase and an I-loop CBA phase.
The protection device calculates the zero-sequence current phase angle alpha of the II-loop line of the double-loop line on the same tower:
α＝r1+r2-π-β
wherein, Zmzero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved; zI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1For double-circuit line I loop on the same towerPositive sequence impedance of the line.
The protection device calculates the zero sequence current of the II-loop line of the double-loop line on the same tower
The protection device calculates the fault phase voltage (phi phase voltage) when the I-loop circuit of the same-pole double-loop circuit normally operatesWherein, phi rho is an I-loop ACB phase, an I-loop BAC phase and an I-loop CBA phase.
If the non-same-name-phase overline ground fault point of the double-circuit line is positioned in the protection setting range, the amplitude of the fault phase voltage abrupt change quantity at the protection setting range is metOn the contrary, if the non-same-name-phase overline ground fault point of the double-circuit line is positioned outside the protection setting range, the fault phase voltage abrupt change amplitude value at the protection setting range is metA composite voltage protection criterion of the double-circuit line non-same-name-phase overline ground fault is provided according to the voltage amplitude characteristic as follows:
judgment ofAnd if the fault is true, judging that the non-same-name phase overline ground fault point is positioned in the I-loop circuit protection setting range of the double-loop circuit on the same tower, and sending an action trip signal by the protection device.
Wherein lsetProtecting and setting a range for a circuit I of a double-circuit line on the same tower; l is the length of the I loop of the double-loop line on the same tower; zI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1Is a straight line of a double-circuit line I on the same towerA sequence impedance; zmThe zero sequence mutual inductance is the zero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower.
The method only uses the single-end single-loop line electric quantity, does not need to introduce another loop line electric quantity, has no influence on the action performance by the operation mode of the power system, and has strong adaptability when the operation mode of the power system is greatly changed.
The method of the invention takes the influence of the zero sequence mutual inductance between the lines into account, and eliminates the influence of the zero sequence mutual inductance between the lines on the performance of the protection action.
The method of the invention does not need to memorize the voltage before the line fault and set the voltage holding loop before the line fault, thereby simplifying the hardware design of the relay protection device.
The action characteristic circle of the method passes through the third quadrant, the origin of coordinates is positioned in the action characteristic circle, no protection dead zone exists when the non-same-name-phase overline ground fault of the forward outlet is protected, and the non-same-name-phase overline ground fault of the reverse outlet is protected from misoperation.
The method has the advantages that the action characteristic is transient action characteristic in two cycles after the double-circuit line non-same-name-phase overline ground fault, and the method has strong capability of resisting the influence of transition resistance and load current.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (1)
1. The double-circuit line non-same-name-phase overline ground fault composite voltage protection method based on adjacent line zero sequence current actual measurement is characterized by comprising the following sequential steps of:
(1) the protection device measures the fault phase voltage at the protection installation position of the I-loop circuit of the double-loop circuit on the same towerSudden change of fault phase voltageFault phase currentPhase current break amount of faultAnd zero sequence currentMeasuring two-fault phase voltage at I-loop circuit protection installation position of double-loop circuit on same towerWherein,rho is respectively and correspondingly expressed as an I loop line ACB phase, an I loop line BAC phase and an I loop line CBA phase;
(2) the protection device calculates the zero-sequence current phase angle alpha of the II-loop line of the double-loop line on the same tower:
α＝r1+r2-π-β
wherein, Zmzero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved; zI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained;
(3) the protection device calculates the zero sequence current of the II-loop line of the double-loop line on the same tower
(4) The protection device calculates phi phase voltage when the I-loop circuit of the same-pole parallel double-loop circuit normally operates:
(5) protection device judgmentIf yes, judging that the non-same-name phase overline ground fault point is located in the I-loop circuit protection setting range of the double-loop circuit on the same tower, and sending an action trip signal by the protection device; wherein lsetProtecting and setting a range for a circuit I of a double-circuit line on the same tower; l is the length of the I loop of the double-loop line on the same tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610186405.8A CN105896486A (en) | 2016-03-29 | 2016-03-29 | Composite voltage protection method for non-phase interline earth fault of double-circuit lines based on zero sequence current actual measurement of adjacent lines |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610186405.8A CN105896486A (en) | 2016-03-29 | 2016-03-29 | Composite voltage protection method for non-phase interline earth fault of double-circuit lines based on zero sequence current actual measurement of adjacent lines |
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| CN105896486A true CN105896486A (en) | 2016-08-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968384A (en) * | 2017-10-20 | 2018-04-27 | 中国电力科学研究院有限公司 | A kind of same bar multiloop zero-sequence protection method and device |
| CN109270405A (en) * | 2018-11-02 | 2019-01-25 | 广东电网有限责任公司 | A kind of Zero sequence parameter calculation method and system based on double-circuit line characteristic equation |
| CN113009375A (en) * | 2021-02-23 | 2021-06-22 | 重庆大学 | Power distribution network disconnection and grounding composite fault protection method considering transition resistance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968384A (en) * | 2017-10-20 | 2018-04-27 | 中国电力科学研究院有限公司 | A kind of same bar multiloop zero-sequence protection method and device |
| CN107968384B (en) * | 2017-10-20 | 2022-04-05 | 中国电力科学研究院有限公司 | Same-pole multi-loop zero-sequence current protection method and device |
| CN109270405A (en) * | 2018-11-02 | 2019-01-25 | 广东电网有限责任公司 | A kind of Zero sequence parameter calculation method and system based on double-circuit line characteristic equation |
| CN109270405B (en) * | 2018-11-02 | 2021-01-26 | 广东电网有限责任公司 | Zero sequence parameter calculation method and system based on double-circuit line characteristic equation |
| CN113009375A (en) * | 2021-02-23 | 2021-06-22 | 重庆大学 | Power distribution network disconnection and grounding composite fault protection method considering transition resistance |
| CN113009375B (en) * | 2021-02-23 | 2022-02-01 | 重庆大学 | Power distribution network disconnection and grounding composite fault protection method considering transition resistance |
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Application publication date: 20160824 |