CN107317310A - The residual voltage compensating element, blocking method and device of a kind of multiple-circuit on same tower - Google Patents
The residual voltage compensating element, blocking method and device of a kind of multiple-circuit on same tower Download PDFInfo
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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
- H02H7/267—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 for parallel lines and wires
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Abstract
The invention provides the residual voltage compensating element, blocking method and device of a kind of multiple-circuit on same tower, including collection faulty line break down before load current and the zero-sequence current after breaking down and the residual voltage at residual voltage compensating element,；The first criterion is built according to zero-sequence current, Second Criterion is built according to residual voltage, the 3rd criterion is built according to zero-sequence current and load current；After zero-sequence current meets the zero-sequence voltage injection entry condition of the first criterion：If residual voltage meets the barring condition of Second Criterion, or zero-sequence current and load current meet the barring condition of the 3rd criterion, then locking residual voltage compensating element,.Compared with prior art, a kind of residual voltage compensating element, blocking method for multiple-circuit on same tower that the present invention is provided, ensure that common-tower double-return line wherein a loop line occur asymmetric open conductors when, the residual voltage compensating element, of another loop line will not misoperation, and occur earth fault when being capable of reliably working.
Description
Technical Field
The invention relates to the technical field of power transmission of power systems, in particular to a zero sequence voltage compensation element locking method suitable for a same-tower double-circuit line with long distance, double ends and a common bus.
Background
The power system faults mainly comprise two types of faults, namely a transverse fault and a longitudinal fault, wherein the transverse fault refers to various types of short-circuit faults and comprises a three-phase short circuit, a two-phase short circuit, a single-phase grounding short circuit and a two-phase grounding short circuit, and the longitudinal fault refers to various types of disconnection faults and comprises a single-phase disconnection, a two-phase disconnection and a three-phase disconnection. When a transverse fault occurs in a long-distance transmission line, such as a line end ground fault or a line end ground fault via high resistance, a zero sequence voltage compensation method is generally adopted to overcome the problem that a zero sequence directional element fails due to low zero sequence voltage: the zero sequence voltage compensation is established based on the characteristics of a zero sequence fault component network when the earth fault occurs, if the positive earth fault occurs, the compensated zero sequence voltage is obviously increased, and the action of elements in the zero sequence direction is more reliable; if a reverse earth fault occurs, the zero sequence voltage after compensation is smaller, the elements in the zero sequence direction cannot malfunction, and the judgment result after compensation is kept to be the same as the actual fault direction.
However, the zero sequence voltage compensation method mainly aims at the asymmetric transverse fault of the transmission line, and does not consider the longitudinal fault of the transmission line. For example, when a long-distance double-end common bus on the same tower is used for transmitting larger power, after an asymmetric longitudinal fault occurs on one line, larger zero-sequence unbalanced current can be generated on a fault line and a non-fault line due to power flow transfer, and zero-sequence mutual impedance also exists between the double lines on the same tower, and the value of the zero-sequence mutual impedance can reach 50-70% of the self impedance of the line, so that the zero-sequence current on the fault line is less shunted along systems at two ends, and zero-sequence voltage at two ends of the line is smaller, so that the false starting of a zero-sequence voltage compensation element and the false judgment of a zero-sequence directional element on the non-fault line can be caused, and the.
Disclosure of Invention
In order to meet the needs of the prior art, the invention provides a zero sequence voltage compensation element locking method and device for a same-tower double-circuit line, and a zero sequence direction element.
In a first aspect, a technical scheme of a zero-sequence voltage compensation element locking method for a same-tower double-circuit line in the invention is as follows:
the method comprises the following steps:
collecting the load current before the fault occurs in the fault line in the same-tower double-circuit line, the zero-sequence current after the fault occurs and the zero-sequence voltage at the zero-sequence voltage compensation element;
establishing a first criterion according to the zero sequence current, establishing a second criterion according to the zero sequence voltage, and establishing a third criterion according to the zero sequence current and the load current;
when the zero-sequence current meets the zero-sequence direction protection starting condition of the first criterion: and if the zero sequence voltage meets the locking condition of a second criterion, or the zero sequence current and the load current meet the locking condition of a third criterion, locking the zero sequence voltage compensation element.
In a second aspect, a technical solution of the zero-sequence voltage compensation element locking device for the double-circuit line on the same tower in the present invention is:
the zero-sequence voltage compensation element locking device comprises a data acquisition unit, a first criterion unit, a second criterion unit and a third criterion unit;
the data acquisition unit is used for acquiring the load current before the fault occurs in the fault line in the same-tower double-circuit line, the zero-sequence current after the fault occurs and the zero-sequence voltage at the zero-sequence voltage compensation element;
the first criterion unit is used for constructing a first criterion according to the zero-sequence current and starting zero-sequence direction protection after the zero-sequence current meets the zero-sequence direction protection starting condition;
the second data unit constructs second data according to the zero sequence voltage, and locks the zero sequence voltage compensation element when the zero sequence current meets the zero sequence direction protection starting condition and the zero sequence voltage meets the locking condition of the second criterion;
and the third criterion unit is used for constructing a third criterion according to the zero sequence current and the load current, and locking the zero sequence voltage compensation element when the zero sequence current meets the zero sequence direction protection starting condition and the zero sequence current and the load current meet the locking condition of the third criterion.
In a third aspect, a technical scheme of a zero-sequence directional element of a double-circuit line on the same tower in the invention is as follows:
the zero sequence directional element comprises a zero sequence voltage compensation module and the zero sequence voltage compensation element locking device of the double circuit line on the same tower as claimed in claims 4-6.
Compared with the closest prior art, the invention has the beneficial effects that:
1. the zero-sequence voltage compensation element locking method for the double-circuit line on the same tower provided by the invention has the advantages that the zero-sequence voltage compensation element locking criterion is established based on the longitudinal fault zero-sequence unbalanced current, the zero-sequence voltage and the load current before the fault, so that when one circuit of the double-circuit line on the same tower has an asymmetric longitudinal fault, the zero-sequence voltage compensation element of the other circuit can not malfunction, and can reliably work when a ground fault occurs;
2. according to the zero sequence voltage compensation element locking method for the double-circuit on the same tower, the floating zero sequence current threshold value of the zero sequence current is set in the third criterion, so that the accuracy of the third criterion is improved, and the zero sequence voltage compensation element cannot malfunction;
3. the zero sequence voltage compensation element locking device of the same-tower double-circuit line can be arranged in a longitudinal zero sequence direction protection device together with a zero sequence voltage compensation element, can also be arranged in a zero sequence direction element with a zero sequence voltage compensation function, is suitable for different working conditions, and is convenient to use.
Drawings
FIG. 1: the invention discloses a flow chart of a zero sequence voltage compensation element locking method of a same-tower double-circuit line;
FIG. 2: the schematic diagram of the zero sequence voltage compensation element locking device of the same-tower double-circuit line in the embodiment of the invention;
FIG. 3: the embodiment of the invention discloses a schematic diagram of a same-tower double-circuit line;
wherein, 11: a data acquisition unit; 12: a first criterion unit; 13: a second criterion unit; 14: a third criterion unit; 21: i return wire of double return wires on the same tower; 22: the M side longitudinal zero sequence direction protection device in the I loop; 23: the N side longitudinal zero sequence direction protection device in the loop I; 24: a II return wire of the double return wires on the same tower; 25: the M side longitudinal zero sequence direction protection device in the loop II; 26: and the N side longitudinal zero sequence direction protection device in the II loop.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes a zero sequence voltage compensation element locking method for a double-circuit line on the same tower according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for locking zero-sequence voltage compensation elements of a double-circuit line on the same tower according to an embodiment of the present invention, where as shown in the figure, the method for locking zero-sequence voltage compensation elements in this embodiment includes the following steps:
step S101: and collecting the load current before the fault occurs in the fault line in the same-tower double-circuit line, the zero-sequence current after the fault occurs and the zero-sequence voltage at the zero-sequence voltage compensation element.
1. Load current
In the embodiment, a fault recorder is adopted to obtain the load current before the fault occurs in the fault line.
2. Zero sequence current and zero sequence voltage
When one circuit of the double-circuit circuits on the same tower has a fault, the longitudinal zero-sequence direction protection device installed on the same tower is started, and the three-phase current I of the fault circuit is collecteda、Ib、IcAnd three phase voltage Ua、Ub、UcCalculating to obtain zero sequence current I0And zero sequence voltage U0。
Step S102: and constructing a first criterion according to the zero sequence current, constructing a second criterion according to the zero sequence voltage, and constructing a third criterion according to the zero sequence current and the load current.
The first criterion in this embodiment is: and if the value of the zero-sequence current is greater than or equal to the fixed threshold value, starting the zero-sequence direction protection action, otherwise, not starting the zero-sequence direction protection action. The second criterion is: and if the zero-sequence voltage is greater than the threshold value, locking the zero-sequence voltage compensation element, otherwise, starting the zero-sequence voltage compensation element. The third criterion is: and if the load current is greater than the heavy load threshold value and the zero sequence current is greater than the floating threshold value, starting the zero sequence voltage compensation element, and otherwise, locking the zero sequence voltage compensation element.
In this embodiment, the zero sequence direction protection action is started, when the longitudinal zero sequence direction protection device is installed on the same-tower double-circuit line, if the value of the zero sequence current is greater than or equal to the fixed threshold value, the longitudinal zero sequence direction protection device starts zero sequence direction protection.
In this embodiment, the fixed threshold value of the zero-sequence current, the threshold value of the zero-sequence voltage, and the heavy-load threshold value of the load current may be preset by a technician. The method for calculating the floating threshold value of the zero-sequence current comprises the following steps:
I′OMK＝Kramp·(Iload-Iload,MK)+IOMK(3)
wherein, KrampIs a floating threshold value I'OMKSlope of (1), IloadFor the load current before the fault in the faulty line in the double-circuit line on the same tower, Iload,MKIs a heavy load threshold value of the load current, IOMKThe fixed threshold value of zero sequence current after the fault line in the same tower double-circuit line has fault;
threshold value I 'floats'OMKSlope K oframpThe calculation formula of (2) is as follows:
wherein, Y is 1/ZkT1[ZkT1ZkT0(ZkF1+2ZkF0)+ZkF1ZkF0(ZkT1+2ZkT0)]；ZkT1Is a forward sequence impedance of the same direction, ZkT0For equidirectional zero-sequence impedance, ZkF1Is a reverse positive sequence impedance, ZkF0Is a reverse zero sequence impedance. In this embodiment, Z is calculated by a six-order component methodkT1、ZkT0、ZkF1、ZkF0The method specifically comprises the following steps:
wherein Z isMs1、ZNs1Positive sequence impedance, Z, for two-end systems of double loops on the same towerMs0、ZNs0Zero sequence impedance, Z, for two-end systems of double-circuit lines on the same towerLIs the self-impedance of a single loop, ZMIs interphase mutual impedance of a single loop line, Z'MIs the mutual impedance between the double loops.
Step S103: when the zero-sequence current meets the zero-sequence direction protection starting condition of the first criterion: and if the zero-sequence voltage meets the locking condition of the second criterion, locking the zero-sequence voltage compensation element and calculating the zero-sequence direction.
When the zero-sequence current meets the zero-sequence direction protection starting condition of the first criterion: if the zero sequence current and the load current meet the locking condition of a third criterion, locking the zero sequence voltage compensation element and calculating the zero sequence direction; if the locking condition is not met, the zero sequence voltage compensation element is started, and the zero sequence direction is calculated according to the compensated zero sequence voltage.
The following describes a zero sequence voltage compensation element locking device for a double-circuit line on the same tower according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 2 is a schematic diagram of a zero-sequence voltage compensation element locking device of a double-circuit line on the same tower in an embodiment of the present invention, and as shown in the drawing, the zero-sequence voltage compensation element locking device in this embodiment includes a data acquisition unit 11, a first criterion unit 12, a second criterion unit 13, and a third criterion unit 14. Wherein,
and the data acquisition unit 11 is used for acquiring the load current before the fault occurs in the fault line in the same-tower double-circuit line, the zero-sequence current after the fault occurs and the zero-sequence voltage at the zero-sequence voltage compensation element.
The first criterion unit 12 constructs a first criterion according to the zero sequence current, and starts the zero sequence direction protection when the zero sequence current satisfies the zero sequence direction protection starting condition.
The second criterion unit 13 constructs a second criterion according to the zero-sequence voltage, and locks the zero-sequence voltage compensation element when the zero-sequence current satisfies the zero-sequence direction protection starting condition and the zero-sequence voltage satisfies the locking condition of the second criterion.
And a third criterion unit 14 for constructing a third criterion according to the zero sequence current and the load current, and locking the zero sequence voltage compensation element when the zero sequence current satisfies the zero sequence direction protection starting condition and the zero sequence current and the load current satisfy the locking condition of the third criterion.
The first criterion of the first criterion unit 12 in this embodiment is: and if the value of the zero-sequence current is greater than or equal to the fixed threshold value, starting the zero-sequence direction protection action, otherwise, not starting the zero-sequence direction protection action.
The second criterion of the second criterion unit 13 is: and if the zero-sequence voltage is greater than the threshold value, locking the zero-sequence voltage compensation element and calculating the zero-sequence direction, otherwise, starting the zero-sequence voltage compensation element.
The third criterion of the third criterion unit 14 is: and if the load current is greater than the heavy load threshold value and the zero sequence current is greater than the floating threshold value, starting the zero sequence voltage compensation element, and calculating the zero sequence direction according to the compensated zero sequence voltage, otherwise, locking the zero sequence voltage compensation element and directly calculating the zero sequence direction. In this embodiment, the third criterion unit 14 includes a floating threshold value calculation model, which specifically includes:
I′OMK＝Kramp·(Iload-Iload,MK)+IOMK(6)
wherein, KrampIs a floating threshold value I'OMKSlope of (1), IloadFor the load current before the fault in the faulty line in the double-circuit line on the same tower, Iload,MKIs a heavy load threshold value of the load current, IOMKThe fixed threshold value of zero sequence current after the fault line in the same tower double-circuit line has fault;
threshold value I 'floats'OMKSlope K oframpThe calculation model of (a) is:
wherein, Y is 1/ZkT1[ZkT1ZkT0(ZkF1+2ZkF0)+ZkF1ZkF0(ZkT1+2ZkT0)]；ZkT1Is a forward sequence impedance of the same direction, ZkT0For equidirectional zero-sequence impedance, ZkF1Is a reverse positive sequence impedance, ZkF0Is a reverse zero sequence impedance.
The invention also provides a zero sequence direction element of the same-tower double-circuit line, which comprises a zero sequence voltage compensation module and the zero sequence voltage compensation element locking device of the same-tower double-circuit line. When the single circuit line in the same-tower double-circuit line has a longitudinal fault, the other single circuit line does not carry out zero sequence voltage compensation, so that the reliability of the zero sequence directional element is ensured, and the action performance of the zero sequence directional element is improved.
In the following, the zero sequence voltage compensation element locking method proposed by the present invention is explained by taking the double-circuit line on the same tower as shown in fig. 3 as an example, as shown in the figure, an M-side longitudinal zero sequence direction protection device 22 is installed on the M side of the I-circuit line 21, an N-side longitudinal zero sequence direction protection device 23 is installed on the N side, an M-side longitudinal zero sequence direction protection device 25 is installed on the M side of the II-circuit line 24, and an N-side longitudinal zero sequence direction protection device 26 is installed on the N side. The method for locking the zero sequence voltage compensation element in the embodiment specifically comprises the following steps:
1. the three-phase current of the M side of the I loop is collected, and after the M side longitudinal zero sequence direction protection device 22 is started, the load current before the fault of the I loop, the zero sequence current after the fault and the zero sequence voltage at the installation position of the M side longitudinal zero sequence direction protection device 22 after the fault are obtained.
2. And judging whether the zero sequence current, the load current and the zero sequence voltage accord with the locking condition of the zero sequence voltage compensation element, if so, locking the zero sequence voltage compensation element of the M-side longitudinal zero sequence direction protection device 22, and ensuring that the zero sequence voltage compensation element of the I loop line does not malfunction when the asymmetric longitudinal fault occurs in the II loop line.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The zero sequence voltage compensation element locking method for the same-tower double-circuit line can ensure that the long-distance double-end common bus same-tower double-circuit line, when one circuit line has an asymmetric longitudinal fault, the zero sequence voltage compensation element of the other circuit line does not malfunction, and can reliably work when a ground fault occurs.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A method for locking zero sequence voltage compensation elements of a same-tower double-circuit line is characterized by comprising the following steps:
collecting the load current before the fault occurs in the fault line in the same-tower double-circuit line, the zero-sequence current after the fault occurs and the zero-sequence voltage at the zero-sequence voltage compensation element;
establishing a first criterion according to the zero sequence current, establishing a second criterion according to the zero sequence voltage, and establishing a third criterion according to the zero sequence current and the load current;
when the zero-sequence current meets the zero-sequence direction protection starting condition of the first criterion: and if the zero sequence voltage meets the locking condition of a second criterion, or the zero sequence current and the load current meet the locking condition of a third criterion, locking the zero sequence voltage compensation element.
2. The method for locking the zero sequence voltage compensation element of the double-circuit line on the same tower as the claim 1,
the first criterion is: if the zero-sequence current is larger than or equal to a fixed threshold value, starting a zero-sequence direction protection action, otherwise, not starting the zero-sequence direction protection action;
the second criterion is: if the zero sequence voltage is larger than a threshold value, locking the zero sequence voltage compensation element, otherwise, starting the zero sequence voltage compensation element;
the third criterion is: and if the load current is greater than a heavy load threshold value and the zero sequence current is greater than a floating threshold value, starting the zero sequence voltage compensation element, and otherwise, locking the zero sequence voltage compensation element.
3. The method as claimed in claim 2, wherein the floating threshold is calculated by the following formula:
I′OMK＝Kramp·(Iload-Iload,MK)+IOMK(1)
wherein, KrampIs a floating threshold value I'OMKSlope of (1), IloadFor the load current before the fault of the faulty line in the double-circuit line on the same tower, Iload,MKIs a heavy load threshold value, I, of the load currentOMKThe fixed threshold value of the zero sequence current after the fault occurs in the fault line in the same-tower double-circuit line is obtained;
the floating threshold value I'OMKSlope K oframpThe calculation formula of (2) is as follows:
<mrow> <msub> <mi>K</mi> <mrow> <mi>r</mi> <mi>a</mi> <mi>m</mi> <mi>p</mi> </mrow> </msub> <mo>=</mo> <mo>|</mo> <mn>3</mn> <mrow> <mo>(</mo> <msub> <mi>Z</mi> <mrow> <mi>k</mi> <mi>T</mi> <mn>0</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>Z</mi> <mrow> <mi>k</mi> <mi>F</mi> <mn>0</mn> </mrow> </msub> <mo>)</mo> </mrow> <msubsup> <mi>Z</mi> <mrow> <mi>k</mi> <mi>T</mi> <mn>1</mn> </mrow> <mn>2</mn> </msubsup> <msub> <mi>Z</mi> <mrow> <mi>k</mi> <mi>F</mi> <mn>1</mn> </mrow> </msub> <mi>Y</mi> <mo>|</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
wherein, Y is 1/ZkT1[ZkT1ZkT0(ZkF1+2ZkF0)+ZkF1ZkF0(ZkT1+2ZkT0)]；
ZkT1Is a forward sequence impedance of the same direction, ZkT0For equidirectional zero-sequence impedance, ZkF1Is a reverse positive sequence impedance, ZkF0Is a reverse zero sequence impedance.
4. The zero-sequence voltage compensation element locking device of the same-tower double-circuit line is characterized by comprising a data acquisition unit, a first criterion unit, a second criterion unit and a third criterion unit;
the data acquisition unit is used for acquiring the load current before the fault occurs in the fault line in the same-tower double-circuit line, the zero-sequence current after the fault occurs and the zero-sequence voltage at the zero-sequence voltage compensation element;
the first criterion unit is used for constructing a first criterion according to the zero-sequence current and starting zero-sequence direction protection after the zero-sequence current meets the zero-sequence direction protection starting condition;
the second data unit constructs second data according to the zero sequence voltage, and locks the zero sequence voltage compensation element when the zero sequence current meets the zero sequence direction protection starting condition and the zero sequence voltage meets the locking condition of the second criterion;
and the third criterion unit is used for constructing a third criterion according to the zero sequence current and the load current, and locking the zero sequence voltage compensation element when the zero sequence current meets the zero sequence direction protection starting condition and the zero sequence current and the load current meet the locking condition of the third criterion.
5. The zero-sequence voltage compensating element blocking device of the double-circuit line on the same tower as claim 4, wherein the first criterion is as follows: if the zero-sequence current is larger than or equal to a fixed threshold value, starting a zero-sequence direction protection action, otherwise, not starting the zero-sequence direction protection action;
the second criterion is: if the zero sequence voltage is larger than a threshold value, locking the zero sequence voltage compensation element, otherwise, starting the zero sequence voltage compensation element;
the third criterion is: and if the load current is greater than a heavy load threshold value and the zero sequence current is greater than a floating threshold value, starting the zero sequence voltage compensation element, and otherwise, locking the zero sequence voltage compensation element.
6. The zero-sequence voltage compensation element locking device of the double-circuit line on the same tower as claim 5, wherein the third criterion unit comprises a floating threshold value calculation model, specifically:
I′OMK＝Kramp·(Iload-Iload,MK)+IOMK(3) wherein, KrampIs a floating threshold value I'OMKSlope of (1), IloadFor the load current before the fault of the faulty line in the double-circuit line on the same tower, Iload,MKIs a heavy load threshold value, I, of the load currentOMKFor the fault line in the same-tower double-circuit lineA fixed threshold value of zero sequence current after a fault occurs on a road;
the floating threshold value I'OMKSlope K oframpThe calculation model of (a) is:
<mrow> <msub> <mi>K</mi> <mrow> <mi>r</mi> <mi>a</mi> <mi>m</mi> <mi>p</mi> </mrow> </msub> <mo>=</mo> <mo>|</mo> <mn>3</mn> <mrow> <mo>(</mo> <msub> <mi>Z</mi> <mrow> <mi>k</mi> <mi>T</mi> <mn>0</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>Z</mi> <mrow> <mi>k</mi> <mi>F</mi> <mn>0</mn> </mrow> </msub> <mo>)</mo> </mrow> <msubsup> <mi>Z</mi> <mrow> <mi>k</mi> <mi>T</mi> <mn>1</mn> </mrow> <mn>2</mn> </msubsup> <msub> <mi>Z</mi> <mrow> <mi>k</mi> <mi>F</mi> <mn>1</mn> </mrow> </msub> <mi>Y</mi> <mo>|</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
wherein, Y is 1/ZkT1[ZkT1ZkT0(ZkF1+2ZkF0)+ZkF1ZkF0(ZkT1+2ZkT0)]；
ZkT1Is a forward sequence impedance of the same direction, ZkT0For equidirectional zero-sequence impedance, ZkF1Is a reverse positive sequence impedance, ZkF0Is a reverse zero sequence impedance.
7. Zero sequence directional element of a double circuit on the same tower, comprising a zero sequence voltage compensation module, characterized in that it comprises a zero sequence voltage compensation element blocking device of a double circuit on the same tower as claimed in claims 4-6.
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| CN108092245A (en) * | 2018-01-09 | 2018-05-29 | 国网江苏省电力有限公司无锡供电分公司 | A kind of high voltage transmission line line protection device and method |
| CN108521116A (en) * | 2018-03-07 | 2018-09-11 | 中国电力科学研究院有限公司 | A kind of method and system for transmission line of electricity longitudinal direction failure to be identified |
| CN109301799A (en) * | 2018-10-12 | 2019-02-01 | 中国电力科学研究院有限公司 | A kind of method and system preventing multiple-loop line line pilot zero sequence direction relay malfunction |
| CN113659546A (en) * | 2021-08-19 | 2021-11-16 | 国网湖南省电力有限公司 | Zero sequence direction element compensation method and system for double-circuit line power supply system |
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| CN105337256A (en) * | 2015-11-23 | 2016-02-17 | 西安交通大学 | Zero sequence voltage compensation element locking method for double-circuit same-tower line |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092245A (en) * | 2018-01-09 | 2018-05-29 | 国网江苏省电力有限公司无锡供电分公司 | A kind of high voltage transmission line line protection device and method |
| CN108092245B (en) * | 2018-01-09 | 2023-07-21 | 国网江苏省电力有限公司无锡供电分公司 | High-voltage transmission line protection device and method |
| CN108521116A (en) * | 2018-03-07 | 2018-09-11 | 中国电力科学研究院有限公司 | A kind of method and system for transmission line of electricity longitudinal direction failure to be identified |
| CN109301799A (en) * | 2018-10-12 | 2019-02-01 | 中国电力科学研究院有限公司 | A kind of method and system preventing multiple-loop line line pilot zero sequence direction relay malfunction |
| CN113659546A (en) * | 2021-08-19 | 2021-11-16 | 国网湖南省电力有限公司 | Zero sequence direction element compensation method and system for double-circuit line power supply system |
| CN113659546B (en) * | 2021-08-19 | 2023-08-08 | 国网湖南省电力有限公司 | Zero sequence direction element compensation method and system for double-circuit line power supply system |
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