CN107317310A  The residual voltage compensating element, blocking method and device of a kind of multiplecircuit on same tower  Google Patents
The residual voltage compensating element, blocking method and device of a kind of multiplecircuit on same tower Download PDFInfo
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 CN107317310A CN107317310A CN201610270856.XA CN201610270856A CN107317310A CN 107317310 A CN107317310 A CN 107317310A CN 201610270856 A CN201610270856 A CN 201610270856A CN 107317310 A CN107317310 A CN 107317310A
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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 shortcircuit, 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 shortcircuit, 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 multiplecircuit on same tower, including collection faulty line break down before load current and the zerosequence current after breaking down and the residual voltage at residual voltage compensating element,；The first criterion is built according to zerosequence current, Second Criterion is built according to residual voltage, the 3rd criterion is built according to zerosequence current and load current；After zerosequence current meets the zerosequence voltage injection entry condition of the first criterion：If residual voltage meets the barring condition of Second Criterion, or zerosequence 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 multiplecircuit on same tower that the present invention is provided, ensure that commontower doublereturn 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 sametower doublecircuit 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 shortcircuit faults and comprises a threephase short circuit, a twophase short circuit, a singlephase grounding short circuit and a twophase grounding short circuit, and the longitudinal fault refers to various types of disconnection faults and comprises a singlephase disconnection, a twophase disconnection and a threephase disconnection. When a transverse fault occurs in a longdistance 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 longdistance doubleend common bus on the same tower is used for transmitting larger power, after an asymmetric longitudinal fault occurs on one line, larger zerosequence unbalanced current can be generated on a fault line and a nonfault line due to power flow transfer, and zerosequence mutual impedance also exists between the double lines on the same tower, and the value of the zerosequence mutual impedance can reach 5070% of the self impedance of the line, so that the zerosequence current on the fault line is less shunted along systems at two ends, and zerosequence voltage at two ends of the line is smaller, so that the false starting of a zerosequence voltage compensation element and the false judgment of a zerosequence directional element on the nonfault 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 sametower doublecircuit line, and a zero sequence direction element.
In a first aspect, a technical scheme of a zerosequence voltage compensation element locking method for a sametower doublecircuit 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 sametower doublecircuit line, the zerosequence current after the fault occurs and the zerosequence voltage at the zerosequence 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 zerosequence current meets the zerosequence 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 zerosequence voltage compensation element locking device for the doublecircuit line on the same tower in the present invention is:
the zerosequence 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 sametower doublecircuit line, the zerosequence current after the fault occurs and the zerosequence voltage at the zerosequence voltage compensation element;
the first criterion unit is used for constructing a first criterion according to the zerosequence current and starting zerosequence direction protection after the zerosequence current meets the zerosequence 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 zerosequence directional element of a doublecircuit 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 46.
Compared with the closest prior art, the invention has the beneficial effects that:
1. the zerosequence voltage compensation element locking method for the doublecircuit line on the same tower provided by the invention has the advantages that the zerosequence voltage compensation element locking criterion is established based on the longitudinal fault zerosequence unbalanced current, the zerosequence voltage and the load current before the fault, so that when one circuit of the doublecircuit line on the same tower has an asymmetric longitudinal fault, the zerosequence 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 doublecircuit 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 sametower doublecircuit 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 sametower doublecircuit line;
FIG. 2: the schematic diagram of the zero sequence voltage compensation element locking device of the sametower doublecircuit line in the embodiment of the invention;
FIG. 3: the embodiment of the invention discloses a schematic diagram of a sametower doublecircuit 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 doublecircuit 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 zerosequence voltage compensation elements of a doublecircuit line on the same tower according to an embodiment of the present invention, where as shown in the figure, the method for locking zerosequence 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 sametower doublecircuit line, the zerosequence current after the fault occurs and the zerosequence voltage at the zerosequence 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 doublecircuit circuits on the same tower has a fault, the longitudinal zerosequence direction protection device installed on the same tower is started, and the threephase current I of the fault circuit is collected_{a}、I_{b}、I_{c}And three phase voltage U_{a}、U_{b}、U_{c}Calculating to obtain zero sequence current I_{0}And zero sequence voltage U_{0}。
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 zerosequence current is greater than or equal to the fixed threshold value, starting the zerosequence direction protection action, otherwise, not starting the zerosequence direction protection action. The second criterion is: and if the zerosequence voltage is greater than the threshold value, locking the zerosequence voltage compensation element, otherwise, starting the zerosequence 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 sametower doublecircuit 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 zerosequence current, the threshold value of the zerosequence voltage, and the heavyload threshold value of the load current may be preset by a technician. The method for calculating the floating threshold value of the zerosequence current comprises the following steps:
I′_{OMK}＝K_{ramp}·(I_{load}I_{load,MK})+I_{OMK}(3)
wherein, K_{ramp}Is a floating threshold value I'_{OMK}Slope of (1), I_{load}For the load current before the fault in the faulty line in the doublecircuit line on the same tower, I_{load,MK}Is a heavy load threshold value of the load current, I_{OMK}The fixed threshold value of zero sequence current after the fault line in the same tower doublecircuit line has fault;
threshold value I 'floats'_{OMK}Slope K of_{ramp}The calculation formula of (2) is as follows:
wherein, Y is 1/Z_{kT1}[Z_{kT1}Z_{kT0}(Z_{kF1}+2Z_{kF0})+Z_{kF1}Z_{kF0}(Z_{kT1}+2Z_{kT0})]；Z_{kT1}Is a forward sequence impedance of the same direction, Z_{kT0}For equidirectional zerosequence impedance, Z_{kF1}Is a reverse positive sequence impedance, Z_{kF0}Is a reverse zero sequence impedance. In this embodiment, Z is calculated by a sixorder component method_{kT1}、Z_{kT0}、Z_{kF1}、Z_{kF0}The method specifically comprises the following steps:
wherein Z is_{Ms1}、Z_{Ns1}Positive sequence impedance, Z, for twoend systems of double loops on the same tower_{Ms0}、Z_{Ns0}Zero sequence impedance, Z, for twoend systems of doublecircuit lines on the same tower_{L}Is the selfimpedance of a single loop, Z_{M}Is interphase mutual impedance of a single loop line, Z'_{M}Is the mutual impedance between the double loops.
Step S103: when the zerosequence current meets the zerosequence direction protection starting condition of the first criterion: and if the zerosequence voltage meets the locking condition of the second criterion, locking the zerosequence voltage compensation element and calculating the zerosequence direction.
When the zerosequence current meets the zerosequence 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 doublecircuit 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 zerosequence voltage compensation element locking device of a doublecircuit line on the same tower in an embodiment of the present invention, and as shown in the drawing, the zerosequence 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 sametower doublecircuit line, the zerosequence current after the fault occurs and the zerosequence voltage at the zerosequence 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 zerosequence voltage, and locks the zerosequence voltage compensation element when the zerosequence current satisfies the zerosequence direction protection starting condition and the zerosequence 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 zerosequence current is greater than or equal to the fixed threshold value, starting the zerosequence direction protection action, otherwise, not starting the zerosequence direction protection action.
The second criterion of the second criterion unit 13 is: and if the zerosequence voltage is greater than the threshold value, locking the zerosequence voltage compensation element and calculating the zerosequence direction, otherwise, starting the zerosequence 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}＝K_{ramp}·(I_{load}I_{load,MK})+I_{OMK}(6)
wherein, K_{ramp}Is a floating threshold value I'_{OMK}Slope of (1), I_{load}For the load current before the fault in the faulty line in the doublecircuit line on the same tower, I_{load,MK}Is a heavy load threshold value of the load current, I_{OMK}The fixed threshold value of zero sequence current after the fault line in the same tower doublecircuit line has fault;
threshold value I 'floats'_{OMK}Slope K of_{ramp}The calculation model of (a) is:
wherein, Y is 1/Z_{kT1}[Z_{kT1}Z_{kT0}(Z_{kF1}+2Z_{kF0})+Z_{kF1}Z_{kF0}(Z_{kT1}+2Z_{kT0})]；Z_{kT1}Is a forward sequence impedance of the same direction, Z_{kT0}For equidirectional zerosequence impedance, Z_{kF1}Is a reverse positive sequence impedance, Z_{kF0}Is a reverse zero sequence impedance.
The invention also provides a zero sequence direction element of the sametower doublecircuit line, which comprises a zero sequence voltage compensation module and the zero sequence voltage compensation element locking device of the sametower doublecircuit line. When the single circuit line in the sametower doublecircuit 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 doublecircuit line on the same tower as shown in fig. 3 as an example, as shown in the figure, an Mside longitudinal zero sequence direction protection device 22 is installed on the M side of the Icircuit line 21, an Nside longitudinal zero sequence direction protection device 23 is installed on the N side, an Mside longitudinal zero sequence direction protection device 25 is installed on the M side of the IIcircuit line 24, and an Nside 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 threephase 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 Mside 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 computerreadable 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 ReadOnly Memory (ROM), a Random Access Memory (RAM), or the like.
The zero sequence voltage compensation element locking method for the sametower doublecircuit line can ensure that the longdistance doubleend common bus sametower doublecircuit 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 sametower doublecircuit line is characterized by comprising the following steps:
collecting the load current before the fault occurs in the fault line in the sametower doublecircuit line, the zerosequence current after the fault occurs and the zerosequence voltage at the zerosequence 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 zerosequence current meets the zerosequence 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 doublecircuit line on the same tower as the claim 1,
the first criterion is: if the zerosequence current is larger than or equal to a fixed threshold value, starting a zerosequence direction protection action, otherwise, not starting the zerosequence 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}＝K_{ramp}·(I_{load}I_{load,MK})+I_{OMK}(1)
wherein, K_{ramp}Is a floating threshold value I'_{OMK}Slope of (1), I_{load}For the load current before the fault of the faulty line in the doublecircuit line on the same tower, I_{load,MK}Is a heavy load threshold value, I, of the load current_{OMK}The fixed threshold value of the zero sequence current after the fault occurs in the fault line in the sametower doublecircuit line is obtained;
the floating threshold value I'_{OMK}Slope K of_{ramp}The 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/Z_{kT1}[Z_{kT1}Z_{kT0}(Z_{kF1}+2Z_{kF0})+Z_{kF1}Z_{kF0}(Z_{kT1}+2Z_{kT0})]；
Z_{kT1}Is a forward sequence impedance of the same direction, Z_{kT0}For equidirectional zerosequence impedance, Z_{kF1}Is a reverse positive sequence impedance, Z_{kF0}Is a reverse zero sequence impedance.
4. The zerosequence voltage compensation element locking device of the sametower doublecircuit 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 sametower doublecircuit line, the zerosequence current after the fault occurs and the zerosequence voltage at the zerosequence voltage compensation element;
the first criterion unit is used for constructing a first criterion according to the zerosequence current and starting zerosequence direction protection after the zerosequence current meets the zerosequence 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 zerosequence voltage compensating element blocking device of the doublecircuit line on the same tower as claim 4, wherein the first criterion is as follows: if the zerosequence current is larger than or equal to a fixed threshold value, starting a zerosequence direction protection action, otherwise, not starting the zerosequence 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 zerosequence voltage compensation element locking device of the doublecircuit line on the same tower as claim 5, wherein the third criterion unit comprises a floating threshold value calculation model, specifically:
I′_{OMK}＝K_{ramp}·(I_{load}I_{load,MK})+I_{OMK}(3) wherein, K_{ramp}Is a floating threshold value I'_{OMK}Slope of (1), I_{load}For the load current before the fault of the faulty line in the doublecircuit line on the same tower, I_{load,MK}Is a heavy load threshold value, I, of the load current_{OMK}For the fault line in the sametower doublecircuit lineA fixed threshold value of zero sequence current after a fault occurs on a road;
the floating threshold value I'_{OMK}Slope K of_{ramp}The 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/Z_{kT1}[Z_{kT1}Z_{kT0}(Z_{kF1}+2Z_{kF0})+Z_{kF1}Z_{kF0}(Z_{kT1}+2Z_{kT0})]；
Z_{kT1}Is a forward sequence impedance of the same direction, Z_{kT0}For equidirectional zerosequence impedance, Z_{kF1}Is a reverse positive sequence impedance, Z_{kF0}Is 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 46.
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CN108521116A (en) *  20180307  20180911  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) *  20181012  20190201  中国电力科学研究院有限公司  A kind of method and system preventing multipleloop line line pilot zero sequence direction relay malfunction 
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Cited By (6)
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CN108092245A (en) *  20180109  20180529  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) *  20180109  20230721  国网江苏省电力有限公司无锡供电分公司  Highvoltage transmission line protection device and method 
CN108521116A (en) *  20180307  20180911  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) *  20181012  20190201  中国电力科学研究院有限公司  A kind of method and system preventing multipleloop line line pilot zero sequence direction relay malfunction 
CN113659546A (en) *  20210819  20211116  国网湖南省电力有限公司  Zero sequence direction element compensation method and system for doublecircuit line power supply system 
CN113659546B (en) *  20210819  20230808  国网湖南省电力有限公司  Zero sequence direction element compensation method and system for doublecircuit line power supply system 
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