CN105203920B - The non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line is surveyed based on fault point voltage Sudden Changing Rate amplitude - Google Patents
The non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line is surveyed based on fault point voltage Sudden Changing Rate amplitude Download PDFInfo
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Abstract
The invention discloses one kind to survey the non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line based on fault point voltage Sudden Changing Rate amplitude.The influence of zero-sequence mutual inductance calculates the zero sequence compensation electric current on double-circuit lines on the same pole road I loop line road between the method for the present invention meter and line, calculate the failure front and back non-same famous prime minister's cross-line earth fault voltage jump amount amplitude of double-circuit line, the range function of double-circuit lines on the same pole road I loop line road every bit is successively calculated using linear search method, reaching minimum corresponding point using range function value at the non-same famous prime minister's cross-line earth fault of double-circuit line is the non-same famous prime minister's cross-line earth fault of double-circuit line, eliminate zero-sequence mutual inductance between line, the influence of transition resistance and load current to fault localization precision, the ability influenced with very strong anti-transition resistance and load current, protect positive direction outlet that fault-free ranging dead zone when double-circuit line non-same famous prime minister's cross-line ground fault occurs, with very high one-end fault ranging precision.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a fault point voltage mutation amplitude actual measurement-based double-circuit line non-homonymous phase overline ground fault distance measurement method.
Background
The method is divided from the electric quantity used for ranging, and the fault ranging method can be divided into two main categories: double-ended ranging and single-ended ranging. The double-end fault location method is a method for determining the fault position of the power transmission line by utilizing the electric quantities at two ends of the power transmission line, and the electric quantity at the opposite end needs to be obtained through a channel, so that the dependence on the channel is strong, and the method is also easily influenced by the synchronism of double-end sampling values in actual use. The single-ended distance measurement method is a method for determining the fault position of the power transmission line by only using voltage and current data at one end of the power transmission line, and is widely applied to medium and low voltage lines because only one end of data is needed, communication and data synchronization equipment is not needed, the operation cost is low, and the algorithm is stable. Currently, the single-ended distance measurement method is mainly divided into two types, one is a traveling wave method, and the other is an impedance method. The traveling wave method utilizes the transmission property of fault transient traveling waves to carry out distance measurement, has high precision, is not influenced by an operation mode, excess resistance and the like, has high requirement on the sampling rate, needs a special wave recording device and is not substantially applied at present. The impedance method utilizes the voltage and the current after the fault to calculate the impedance of the fault loop, and carries out distance measurement according to the characteristic that the line length is in direct proportion to the impedance, the distance measurement principle is simple and reliable, but when the impedance method is applied to single-phase earth fault single-end fault distance measurement of double-circuit lines on the same tower, the distance measurement precision is seriously influenced by the transition resistance of the fault point and zero sequence mutual inductance between lines. Zero sequence mutual inductance exists between double-circuit lines on the same tower, and the zero sequence mutual inductance can influence a zero sequence compensation coefficient, so that the error of the ranging result of the impedance method is large. If single-phase high-resistance grounding faults occur in double-circuit lines on the same tower, the single-phase high-resistance grounding faults are comprehensively influenced by zero sequence mutual inductance and high transition resistance between lines, the distance measurement result of an impedance method often exceeds the full length of the lines or does not have the distance measurement result, accurate fault position information cannot be provided, line fault line inspection is difficult, and quick fault discharge and quick line power supply recovery are not facilitated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a fault point voltage mutation amplitude actual measurement-based double-circuit line non-homonymous phase overline ground fault distance measurement method. The method calculates zero sequence compensation current of the I-loop circuit of the double-loop circuit on the same tower by considering the influence of zero sequence mutual inductance between lines, calculates the voltage mutation amplitude of the non-same-name-phase overline ground fault point of the double-loop circuit before and after the fault, sequentially calculates the distance measurement function of each point on the I-loop circuit of the double-loop circuit on the same tower by adopting a one-dimensional search method, takes the point corresponding to the minimum distance measurement function value at the non-same-name-phase overline ground fault point of the double-loop circuit as the non-same-name-phase overline ground fault point, eliminates the influence of the zero sequence mutual inductance between the lines, the transition resistance and the load current on the fault distance measurement precision, has strong capacity of resisting the influence of the transition resistance and the load current, protects no fault distance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the double-circuit line non-same-name-phase overline ground fault distance measurement method based on the voltage break variable amplitude actual measurement of the fault point 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 towerFault phase currentAnd zero sequence currentZero sequence voltageMeasuring two normal phase voltages at the protection installation position of I-loop circuit of double-loop circuit on the same towerWherein α and β correspond to phase I and phase B and phase C when phi is equal to phase I and phase B, α and β correspond to phase I and phase C and α and β correspond to phase I and phase B when phi is equal to phase I and phase C;
(2) the protection device calculates the zero sequence compensation current of the I-loop line of the double-loop line on the same tower
Wherein, 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 is achieved; zI0Is on the same poleZero sequence impedance of the I-loop circuit of the double-loop circuit is erected; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; is the real part of; an imaginary part of; is the real part of; an imaginary part of; j is a complex operator;
(3) the protection device calculates the voltage sudden change amplitude of the non-same-name-phase overline grounding fault point of the double-circuit line before and after the fault
Wherein,is composed ofAn imaginary part of (d);is composed ofAn imaginary part of (d);
(4) the protection device selects the initial value of the fault distance as lxCalculating distance l of I-line protection installation position of double-circuit line on same towerxZero sequence voltage of a pointWherein 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;
(5) protection device calculates l of I-loop protection installation position of double-loop line on same tower from distancexDistance function rho (l) of pointsx)：
(6) Distance of failure lxIncreasing by a fixed step length delta l, returning to the step (4) to calculate each loop on the same-tower double-loop line I in turnxDistance measurement function of pointsUntil the total length of the I-loop circuit of the double-loop circuit on the same tower is reached; wherein, Δ l is a fixed step length, and Δ l can be 0.001 l; l is the length of the I loop of the double-loop line on the same tower;
(7) selectingOne of the double-circuit lines on the same towerxPoint-corresponding range function ρ (l)x) The point where the value reaches the minimum is the double-circuit line non-same-name-phase overline ground fault point.
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 electric quantity, protects the mutual independence and non-series connection of secondary loops, enhances the accuracy of the fault location result, has high location accuracy when the operation mode of the power system is greatly changed, and has no influence on the operation mode of the power system. 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 fault distance measurement precision. The method eliminates the influence of zero sequence mutual inductance between lines, transition resistance and load current on fault location precision, has strong capacity of resisting the influence of the transition resistance and the load current, protects a positive direction outlet from having no fault location dead zone when a double-circuit line non-same-name-phase overline ground fault occurs, and has high single-end fault location precision.
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 schematic diagram of a double-circuit power transmission system on the same tower and with the application of the invention. 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 towerFault phase currentAnd zero sequence currentZero sequence voltageMeasuring two normal phase voltages at the protection installation position of I-loop circuit of double-loop circuit on the same towerWherein, α, β correspond to I-circuit line phase B and C when phi is I-circuit line phase a, α, β correspond to I-circuit line phase C and a when phi is I-circuit line phase B, α, β correspond to I-circuit line phase a and B when phi is I-circuit line phase C.
The protection device calculates the zero sequence compensation current of the I-loop line of the double-loop line on the same tower
Wherein, 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 is achieved; zI0Is on the same poleZero sequence impedance of the I-loop circuit of the double-loop circuit is erected; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; phi-I loopA phase, I loop B phase and I loop C phase; is the real part of; an imaginary part of; is the real part of; is deficiency ofA section; j is a complex operator.
The protection device calculates the voltage sudden change amplitude of the non-same-name-phase overline grounding fault point of the double-circuit line before and after the fault
Wherein,is composed ofAn imaginary part of (d);is composed ofThe imaginary part of (c).
The protection device selects the initial value of the fault distance as lxCalculating distance l of I-line protection installation position of double-circuit line on same towerxZero sequence voltage of a pointWherein l is the length of the I loop of the double-loop line on the same tower; zI0The zero sequence impedance of the I-loop circuit of the double-loop circuit on the same tower is shown.
Protection device calculates l of I-loop protection installation position of double-loop line on same tower from distancexDistance function rho (l) of pointsx)：
Distance of failure lxSequentially calculating each loop on the I-loop of the double-loop line on the same tower by increasing the fixed step length delta lxDistance measurement function of pointsUntil the total length of the I-loop circuit of the double-loop circuit on the same tower is reached; wherein, Δ l is a fixed step length, and Δ l can be 0.001 l; l is the length of the I loop of the double-loop line on the same tower.
Selecting a certain loop on the I-loop of the double-loop line on the same towerxPoint-corresponding range function ρ (l)x) The point where the value reaches the minimum is the double-circuit line non-same-name-phase overline ground fault point.
The method calculates zero sequence compensation current of the I-loop circuit of the double-loop circuit on the same tower by considering the influence of zero sequence mutual inductance between lines, calculates the voltage mutation amplitude of the non-same-name-phase overline ground fault point of the double-loop circuit before and after the fault, sequentially calculates the distance measurement function of each point on the I-loop circuit of the double-loop circuit on the same tower by adopting a one-dimensional search method, takes the point corresponding to the minimum distance measurement function value at the non-same-name-phase overline ground fault point of the double-loop circuit as the non-same-name-phase overline ground fault point, eliminates the influence of the zero sequence mutual inductance between the lines, the transition resistance and the load current on the fault distance measurement precision, has strong capacity of resisting the influence of the transition resistance and the load current, protects no fault distance.
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 distance measurement method based on the voltage break variable amplitude actual measurement of the fault point 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 towerFault phase currentAnd zero sequence currentZero sequence voltageMeasuring two normal phase voltages at the protection installation position of I-loop circuit of double-loop circuit on the same towerWherein α and β correspond to phase I and phase B and phase C when phi is equal to phase I and phase B, α and β correspond to phase I and phase C and α and β correspond to phase I and phase B when phi is equal to phase I and phase C;
(2) the protection device calculates the zero sequence compensation current of the I-loop line of the double-loop line on the same tower
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;is composed ofThe real part of (a);is composed ofAn imaginary part of (d);is composed ofThe real part of (a);is composed ofAn imaginary part of (d); j is a complex operator;
(3) the protection device calculates the voltage sudden change amplitude of the non-same-name-phase overline grounding fault point of the double-circuit line before and after the fault
Wherein,is composed ofAn imaginary part of (d);is composed ofAn imaginary part of (d);
(4) the protection device selects the initial value of the fault distance as lxCalculating the distance of I-loop protection installation position l of the double-loop line on the same towerxZero sequence voltage of a pointWherein 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;
(5) i-loop protection installation position l of double-loop line on same tower for calculating distance by protection devicexDistance function rho (l) of pointsx)：
(6) Distance of failure lxIncreasing by a fixed step length delta l, returning to the step (4) to calculate each loop on the same-tower double-loop line I in turnxDistance measurement function of pointsUntil the total length of the I-loop circuit of the double-loop circuit on the same tower is reached; wherein, Δ l is a fixed step length, and Δ l is taken to be 0.001 l; l is the length of the I loop of the double-loop line on the same tower;
(7) selecting a certain loop on the I-loop of the double-loop line on the same towerxPoint-corresponding range function ρ (l)x) The point where the value reaches the minimum is the double-circuit line non-same-name-phase overline ground fault point.
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| CN201510581856.7A CN105203920B (en) | 2015-09-14 | 2015-09-14 | The non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line is surveyed based on fault point voltage Sudden Changing Rate amplitude |
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| CN201510581856.7A CN105203920B (en) | 2015-09-14 | 2015-09-14 | The non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line is surveyed based on fault point voltage Sudden Changing Rate amplitude |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107576839A (en) * | 2017-09-18 | 2018-01-12 | 唐山松下产业机器有限公司 | Welding equipment, weldingvoltage detection method and device |
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| CN105785226A (en) * | 2016-03-29 | 2016-07-20 | 国网福建省电力有限公司 | Range finding method for non-homonymic phase overline earth fault of double-circuit line based on directional characteristic of position relative coefficient |
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| CN103293441A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Line single-phase earth fault single-terminal location method implemented by aid of distributed parameters |
| CN104090210A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal location method for double-circuit lines |
| CN104090213A (en) * | 2014-07-25 | 2014-10-08 | 国家电网公司 | Double-circuit-line non-same-name phase overline ground fault positioning method |
| CN104090200A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal amplitude value distance measurement method for double-circuit lines |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293441A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Line single-phase earth fault single-terminal location method implemented by aid of distributed parameters |
| CN104090210A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal location method for double-circuit lines |
| CN104090200A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal amplitude value distance measurement method for double-circuit lines |
| CN104090213A (en) * | 2014-07-25 | 2014-10-08 | 国家电网公司 | Double-circuit-line non-same-name phase overline ground fault positioning method |
Cited By (1)
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| CN107576839A (en) * | 2017-09-18 | 2018-01-12 | 唐山松下产业机器有限公司 | Welding equipment, weldingvoltage detection method and device |
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