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CN109066607B - Voltage acceleration method and device for variable time-limit distance protection of power grid line - Google Patents

Voltage acceleration method and device for variable time-limit distance protection of power grid line Download PDF

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CN109066607B
CN109066607B CN201810785590.1A CN201810785590A CN109066607B CN 109066607 B CN109066607 B CN 109066607B CN 201810785590 A CN201810785590 A CN 201810785590A CN 109066607 B CN109066607 B CN 109066607B
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phasor
voltage
value
phase
sequence current
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CN109066607A (en
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周泽昕
李天华
曹虹
郭雅蓉
杜丁香
王兴国
程琪
王德林
吕鹏飞
刘宇
阮思烨
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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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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Abstract

本发明提供一种用于电网线路的变时限距离保护的电压加速方法和装置，通过建立的潮流方向判据和故障过渡电阻判据判断是否需要对距离保护III段的动作时限进行调整，并在判据确认需要对距离保护III段的动作时限进行调整时，通过设定的计算公式进行距离保护III段的动作时限的修正。本发明所述的方法和装置对于安装在电网线路潮流受端的变时限距离保护，当线路发生经大电阻单相接地故障且仅距离保护III段动作时，能使距离保护III段的动作时限明显缩短。

Figure 201810785590

The invention provides a voltage acceleration method and device for variable time limit distance protection of power grid lines. It is judged whether the action time limit of the distance protection stage III needs to be adjusted according to the established power flow direction criterion and fault transition resistance criterion, and when When the criterion confirms that the action time limit of the distance protection stage III needs to be adjusted, the action time limit of the distance protection stage III stage is corrected through the set calculation formula. The method and device of the present invention can make the action time limit of the third stage of the distance protection obvious when the line has a single-phase grounding fault through a large resistance and only the third stage of the distance protection operates for the variable time limit distance protection installed at the power flow receiving end of the power grid line. shorten.

Figure 201810785590

Description

Voltage acceleration method and device for variable time-limit distance protection of power grid line
Technical Field
The present invention relates to the field of relay protection, and more particularly, to a voltage acceleration method and apparatus for variable time-limited distance protection of a power grid line.
Background
Setting calculation and correct fixed value are necessary conditions for ensuring that the relay protection device can play normal performance, and the relay protection setting of the current power grid comprises line protection, bus protection, transformer protection, breaker protection, failure protection overvoltage, long-jump protection and the like. The setting value of most of protection during the capital construction input can adapt to the local change of the power grid, and the setting value is not frequently changed generally. And the distance backup protection of the line protection needs to be matched with the distance backup protection of the adjacent line, and in the process of breaking and building the power grid line, the fixed value of the related line needs to be recalculated and issued to the related substation to change the fixed value. In fact, the inconsistency of the infrastructure project plan and implementation, the fixed value to be changed cannot be in place at one time, and the fixed value in the changing process is often out of fit.
The variable time-limit distance protection utilizes relevant parameters of the distance protection during the fault action of the line, such as ranging, voltage, current and the like, and relevant off-line information, such as impedance fixed values of the distance I section, the distance II section and the distance III section, the line length and the like, to automatically calculate the action time limit of each section of distance protection, and can realize the automatic matching of the action time limit of each section of distance protection of adjacent lines. Although the workload of the setting calculation of the line protection cannot be reduced, the method can adapt to the local change of the power grid, and the fixed value of the adjacent line protection is not required to be changed except for the fixed value of the disconnected or newly-built line.
For time-limited distance protection installed at a power flow receiving end of a line, when the line has a single-phase earth fault through a large resistor, the protection is subjected to under-range measurement, namely the distance from the measured fault to a protection installation position is multiple times of the actual distance, only a distance protection section III acts, and the automatically calculated action time limit of the distance protection section III is too long. In order to solve the problem that the action time limit of the III section of the protection is too long when the time limit of the receiving end of the power flow is changed from the time limit distance when the large-resistance single-phase earth fault occurs, the action time limit of the III section of the protection is required to be shortened and the protection speed is increased through a related method and a related device.
Disclosure of Invention
In order to solve the problem that the action time limit of a section III of the variable time limit distance protection of a power flow receiving end is too long in the case of a large-resistance single-phase earth fault in the background art, the invention provides a voltage acceleration method for the variable time limit distance protection of a power grid line, which comprises the following steps:
collecting instantaneous values of secondary values of three-phase voltage and current at a variable time-limit distance protection installation position, and determining a voltage fundamental wave phasor value according to the instantaneous values of the secondary values of the three-phase voltage
Figure BDA0001733655700000024
Determining the current fundamental wave phasor value according to the instantaneous value of the secondary value of the three-phase current
Figure BDA0001733655700000025
And setting the fault phase voltage fundamental phasor as
Figure BDA0001733655700000026
A voltage fundamental phasor value having a value equal to the faulted phase;
protection of voltage fundamental phasor values at installation site according to failed phase and variable time-limited distance
Figure BDA0001733655700000027
Figure BDA0001733655700000028
Calculating positive sequence voltage phasor
Figure BDA0001733655700000029
Protecting the current fundamental wave phasor value at the installation site according to the variable time-limit distance
Figure BDA00017336557000000210
Calculating zero sequence current
Figure BDA00017336557000000211
And, protecting the current fundamental phasor value at the installation site according to the faulted phase and the variable time-limited distance
Figure BDA00017336557000000212
Figure BDA00017336557000000213
Calculating the positive sequence current phasor
Figure BDA00017336557000000214
When according to the zero sequence current
Figure BDA00017336557000000215
And positive sequence current phasor
Figure BDA00017336557000000216
The determined value does not satisfy the established flow direction criterion F1And according to the zero sequence current
Figure BDA00017336557000000217
And positive sequence voltage phasor
Figure BDA00017336557000000218
The determined value satisfies the established fault transition resistance criterion F2According to the fault phase voltage fundamental wave phasor
Figure BDA00017336557000000219
Δ t before start-up of the method1Time fault phase voltage fundamental phasor
Figure BDA00017336557000000220
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'III。
Further, the fundamental wave phasor value of the voltage at the installation position is protected according to the faulted phase and the variable time-limit distance
Figure BDA00017336557000000221
Calculating positive sequence voltage phasor
Figure BDA00017336557000000222
The method comprises the following steps:
when the failed phase is A, the positive sequence voltage phasor
Figure BDA00017336557000000223
The calculation formula of (2) is as follows:
Figure BDA0001733655700000021
when the failed phase is B phase, the positive sequence voltage phasor
Figure BDA00017336557000000224
The calculation formula of (2) is as follows:
Figure BDA0001733655700000022
positive sequence voltage phasor when C phase is failed
Figure BDA00017336557000000225
The calculation formula of (2) is as follows:
Figure BDA0001733655700000023
further, protecting the current fundamental wave phasor value at the installation position according to the variable time limit distance
Figure BDA0001733655700000037
Calculating zero sequence current
Figure BDA0001733655700000038
And protecting the current fundamental phasor value at the installation site according to the faulted phase and the variable time-limit distance
Figure BDA0001733655700000039
Calculating the positive sequence current phasor
Figure BDA00017336557000000310
The method comprises the following steps: :
zero sequence current
Figure BDA00017336557000000311
The calculation formula of (2) is as follows:
Figure BDA0001733655700000031
when the fault is A phase, the positive sequence current phasor
Figure BDA00017336557000000312
The calculation formula of (2) is as follows:
Figure BDA0001733655700000032
when the fault is B phase, the positive sequence current phasor
Figure BDA00017336557000000313
The calculation formula of (2) is as follows:
Figure BDA0001733655700000033
positive sequence current phasor when C-phase is failed
Figure BDA00017336557000000314
The calculation formula of (2) is as follows:
Figure BDA0001733655700000034
further, the current according to the zero sequence current
Figure BDA00017336557000000315
And positive sequence current phasor
Figure BDA00017336557000000316
The determined value does not satisfy the established flow direction criterion F1And according to the zero sequence current
Figure BDA00017336557000000317
And positive sequence voltage phasor
Figure BDA00017336557000000318
The determined value satisfies the established fault transition resistance criterion F2According to the fault phase voltage fundamental wave phasor
Figure BDA00017336557000000319
Δ t before start-up of the method1Time fault phase voltage fundamental phasor
Figure BDA00017336557000000320
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'IIIThe method comprises the following steps:
according to zero sequence current
Figure BDA00017336557000000321
And positive sequence current phasor
Figure BDA00017336557000000322
Establishing a power flow direction criterion, wherein the formula of the power flow direction criterion is as follows:
Figure BDA0001733655700000035
wherein, F is1The range of F is less than or equal to minus 60 degrees1≤60°；
According to zero sequence current
Figure BDA00017336557000000323
And positive sequence voltage phasor
Figure BDA00017336557000000324
Establishing fault transition resistance criterion F2The formula is as follows:
Figure BDA0001733655700000036
wherein, F is2In the range of-D.ltoreq.F2D is less than or equal to D, when C isLWhen the ratio is larger than m, the ratio is,
Figure BDA00017336557000000325
when C is presentLWhen the thickness is less than or equal to m,
Figure BDA00017336557000000326
n is the set resistivity, CLThe length of the actual power grid line is m, and the length value of the set power grid line is m;
when determined according to the calculation
Figure BDA00017336557000000327
And positive sequence current phasor
Figure BDA00017336557000000328
Obtained F1The value of F is not more than 60 degrees1Less than or equal to 60 degrees and determined according to calculation
Figure BDA0001733655700000042
And positive sequence voltage phasor
Figure BDA0001733655700000043
Obtained F2Has a value of-D. ltoreq. F2When D is less than or equal to D, according to fault phase voltage fundamental wave phasor
Figure BDA0001733655700000044
Δ t before start-up of the method1Time fault phase voltage fundamental phasor
Figure BDA0001733655700000045
Andset margin factor K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'IIIThe formula of (1) is:
Figure BDA0001733655700000041
when determined according to the calculation
Figure BDA0001733655700000046
And positive sequence current phasor
Figure BDA0001733655700000047
Obtained F1The value of F is more than or equal to 60 degrees1Less than or equal to 60 degrees, or zero sequence current determined according to calculation
Figure BDA0001733655700000048
And positive sequence voltage phasor
Figure BDA0001733655700000049
Obtained F2Has a value of-D. ltoreq. F2And when the voltage is less than or equal to D, ending the voltage acceleration method.
According to another aspect of the present invention, there is provided a voltage step-up device for variable time-limited distance protection of a power grid line, the device comprising:
the data acquisition unit is used for acquiring instantaneous values of secondary values of three-phase voltage and current at a variable time-limit distance protection installation position and determining a voltage fundamental wave phasor value according to the instantaneous values of the secondary values of the three-phase voltage
Figure BDA00017336557000000410
Determining the current fundamental wave phasor value according to the instantaneous value of the secondary value of the three-phase current
Figure BDA00017336557000000411
Figure BDA00017336557000000412
And setting the fault phase voltage fundamental phasor as
Figure BDA00017336557000000413
A voltage fundamental phasor value having a value equal to the faulted phase;
a first calculation unit for protecting the phasor value of the voltage fundamental wave at the installation site according to the failed phase and the variable time-limit distance
Figure BDA00017336557000000414
Calculating positive sequence voltage phasor
Figure BDA00017336557000000415
A second calculation unit for protecting the phasor value of the current fundamental wave at the installation site according to the variable time-limited distance
Figure BDA00017336557000000416
Calculating zero sequence current
Figure BDA00017336557000000417
And protecting the current fundamental phasor value at the installation site according to the faulted phase and the variable time-limit distance
Figure BDA00017336557000000418
Calculating the positive sequence current phasor
Figure BDA00017336557000000419
A third calculation unit for calculating a third zero sequence current according to the first zero sequence current
Figure BDA00017336557000000420
And positive sequence current phasor
Figure BDA00017336557000000421
The determined value does not satisfy the established flow direction criterion F1And according to the zero sequence current
Figure BDA00017336557000000422
And positive sequence voltage phasor
Figure BDA00017336557000000423
The determined value satisfies the established fault transition resistance criterion F2According to the fault phase voltage fundamental wave phasor
Figure BDA00017336557000000424
Before the device starts Δ t1Time fault phase voltage fundamental phasor
Figure BDA00017336557000000425
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'III。
Further, the apparatus further comprises a parameter setting unit for setting a margin coefficient K1And the action time limit t of the original distance protection III sectionIIIResistance coefficient N, length C of actual grid lineLAnd a set line length value m.
Further, the first calculation unit protects the phasor value of the voltage fundamental wave at the installation site according to the failed phase and the variable time-limit distance
Figure BDA0001733655700000058
Calculating positive sequence voltage phasor
Figure BDA0001733655700000059
The method comprises the following steps:
when the failed phase is A, the positive sequence voltage phasor
Figure BDA00017336557000000510
The calculation formula of (2) is as follows:
Figure BDA0001733655700000051
when the failed phase is B phase, the positive sequence voltage phasor
Figure BDA00017336557000000511
The calculation formula of (2) is as follows:
Figure BDA0001733655700000052
positive sequence voltage phasor when C phase is failed
Figure BDA00017336557000000512
The calculation formula of (2) is as follows:
Figure BDA0001733655700000053
further, the second calculating unit protects the phasor value of the current fundamental wave at the installation position according to the variable time limit distance
Figure BDA00017336557000000513
Calculating zero sequence current
Figure BDA00017336557000000514
And protecting the current fundamental phasor value at the installation site according to the faulted phase and the variable time-limit distance
Figure BDA00017336557000000515
Calculating the positive sequence current phasor
Figure BDA00017336557000000516
The method comprises the following steps: :
zero sequence current
Figure BDA00017336557000000517
The calculation formula of (2) is as follows:
Figure BDA0001733655700000054
when the fault is A phase, the positive sequence current phasor
Figure BDA00017336557000000518
The calculation formula of (2) is as follows:
Figure BDA0001733655700000055
when the fault is B phase, the positive sequence current phasor
Figure BDA00017336557000000519
The calculation formula of (2) is as follows:
Figure BDA0001733655700000056
positive sequence current phasor when C-phase is failed
Figure BDA00017336557000000520
The calculation formula of (2) is as follows:
Figure BDA0001733655700000057
further, the third calculation unit is used for calculating the zero sequence current according to the zero sequence current
Figure BDA00017336557000000521
And positive sequence current phasor
Figure BDA00017336557000000522
The determined value does not satisfy the established flow direction criterion F1And according to the zero sequence current
Figure BDA00017336557000000526
And positive sequence voltage phasor
Figure BDA00017336557000000523
The determined value satisfies the established fault transition resistance criterion F2According to the phase power of the faultFundamental phasor of voltage
Figure BDA00017336557000000524
Before the device starts Δ t1Time fault phase voltage fundamental phasor
Figure BDA00017336557000000525
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'IIIThe method comprises the following steps:
according to zero sequence current
Figure BDA0001733655700000064
And positive sequence current phasor
Figure BDA0001733655700000065
Establishing a power flow direction criterion, wherein the formula of the power flow direction criterion is as follows:
Figure BDA0001733655700000061
wherein, F is1The range of F is less than or equal to minus 60 degrees1≤60°；
According to zero sequence current
Figure BDA0001733655700000066
And positive sequence voltage phasor
Figure BDA0001733655700000067
Establishing fault transition resistance criterion F2The formula is as follows:
Figure BDA0001733655700000062
wherein, F is2In the range of-D.ltoreq.F2D is less than or equal to D, when C isLWhen the ratio is larger than m, the ratio is,
Figure BDA0001733655700000068
when C is presentLWhen the thickness is less than or equal to m,
Figure BDA0001733655700000069
n is a set resistance coefficient, and m is a set line length value;
when determined according to the calculation
Figure BDA00017336557000000610
And positive sequence current phasor
Figure BDA00017336557000000611
Obtained F1The value of F is not more than 60 degrees1Less than or equal to 60 degrees and determined according to calculation
Figure BDA00017336557000000612
And positive sequence voltage phasor
Figure BDA00017336557000000613
Obtained F2Has a value of-D. ltoreq. F2When D is less than or equal to D, according to fault phase voltage fundamental wave phasor
Figure BDA00017336557000000614
Before the device starts Δ t1Time fault phase voltage fundamental phasor
Figure BDA00017336557000000615
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'IIIThe formula of (1) is:
Figure BDA0001733655700000063
when determined according to the calculation
Figure BDA00017336557000000616
And positive sequence current phasor
Figure BDA00017336557000000617
Obtained F1The value of F is more than or equal to 60 degrees1Less than or equal to 60 degrees, or zero sequence current determined according to calculation
Figure BDA00017336557000000618
And positive sequence voltage phasor
Figure BDA00017336557000000619
Obtained F2Has a value of-D. ltoreq. F2And when the voltage is less than or equal to D, the voltage accelerating device finishes the operation.
The voltage acceleration method and the voltage acceleration device for time-limit-variable distance protection of the power grid line, provided by the technical scheme of the invention, judge whether the action time limit of the distance protection III section needs to be adjusted or not through the established tide direction criterion and the fault transition resistance criterion, and correct the action time limit of the distance protection III section through a set calculation formula when the criterion confirms that the action time limit of the distance protection III section needs to be adjusted. The method and the device can obviously shorten the action time limit of the distance protection III section for the variable time limit distance protection installed at the tidal current receiving end of the power grid line when the line has a large-resistance single-phase earth fault and only the action of the distance protection III section is carried out.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flow chart of a voltage acceleration method for variable time-limited distance protection of a grid line according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a voltage accelerating device for time-limited distance protection of a power grid line according to a preferred embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a voltage acceleration method for variable time-limited distance protection of a grid line according to a preferred embodiment of the present invention. The voltage acceleration method 100 for variable time-limited distance protection of a grid line according to the preferred embodiment as shown in fig. 1 starts with step 101.
In step 101, instantaneous values of secondary values of three-phase voltage and current at a variable time-limit distance protection installation position are collected, and voltage fundamental wave phasor values are determined according to the instantaneous values of the secondary values of the three-phase voltage
Figure BDA0001733655700000071
Figure BDA0001733655700000072
Determining the current fundamental wave phasor value according to the instantaneous value of the secondary value of the three-phase current
Figure BDA0001733655700000073
And setting the fault phase voltage fundamental phasor as
Figure BDA0001733655700000074
A voltage fundamental phasor value having a value equal to the faulted phase;
at step 102, the phasor value of the fundamental wave of the voltage at the installation is protected according to the faulted phase and the variable time-limited distance
Figure BDA0001733655700000075
Calculating positive sequence voltage phasor
Figure BDA0001733655700000076
At step 103, the current fundamental phasor value at the installation site is protected according to the variable time-limit distance
Figure BDA0001733655700000077
Calculating zero sequence current
Figure BDA0001733655700000078
And protecting the current fundamental phasor value at the installation site according to the faulted phase and the variable time-limit distance
Figure BDA0001733655700000088
Calculating the positive sequence current phasor
Figure BDA0001733655700000089
In step 104, when the zero sequence current is based on
Figure BDA00017336557000000810
And positive sequence current phasor
Figure BDA00017336557000000811
The determined value does not satisfy the established flow direction criterion F1And according to the zero sequence current
Figure BDA00017336557000000812
And positive sequence voltage phasor
Figure BDA00017336557000000813
The determined value satisfies the established fault transition resistance criterion F2According to the fault phase voltage fundamental wave phasor
Figure BDA00017336557000000814
Δ t before start-up of the method1Time fault phase voltage fundamental phasor
Figure BDA00017336557000000815
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'III。
Preferably, the fundamental wave phasor value of the voltage at the installation is protected according to the faulted phase and the variable time-limited distance
Figure BDA00017336557000000816
Calculating positive sequence voltage phasor
Figure BDA00017336557000000817
The formula of (1) is as follows:
when the failed phase is A, the positive sequence voltage phasor
Figure BDA00017336557000000818
The calculation formula of (2) is as follows:
Figure BDA0001733655700000081
when the failed phase is B phase, the positive sequence voltage phasor
Figure BDA00017336557000000819
The calculation formula of (2) is as follows:
Figure BDA0001733655700000082
positive sequence voltage phasor when C phase is failed
Figure BDA00017336557000000820
The calculation formula of (2) is as follows:
Figure BDA0001733655700000083
preferably, said time-dependent distance protectionCurrent fundamental phasor value at protected installation
Figure BDA00017336557000000821
Calculating zero sequence current
Figure BDA00017336557000000822
And protecting the current fundamental phasor value at the installation site according to the faulted phase and the variable time-limit distance
Figure BDA00017336557000000823
Calculating the positive sequence current phasor
Figure BDA00017336557000000824
The method comprises the following steps: :
zero sequence current
Figure BDA00017336557000000825
The calculation formula of (2) is as follows:
Figure BDA0001733655700000084
when the fault is A phase, the positive sequence current phasor
Figure BDA00017336557000000826
The calculation formula of (2) is as follows:
Figure BDA0001733655700000085
when the fault is B phase, the positive sequence current phasor
Figure BDA00017336557000000827
The calculation formula of (2) is as follows:
Figure BDA0001733655700000086
positive sequence current phasor when C-phase is failed
Figure BDA00017336557000000828
The calculation formula of (2) is as follows:
Figure BDA0001733655700000087
preferably, said zero sequence current is used as said reference
Figure BDA00017336557000000829
And positive sequence current phasor
Figure BDA00017336557000000830
The determined value does not satisfy the established flow direction criterion F1And according to the zero sequence current
Figure BDA00017336557000000831
And positive sequence voltage phasor
Figure BDA00017336557000000832
The determined value satisfies the established fault transition resistance criterion F2According to the fault phase voltage fundamental wave phasor
Figure BDA0001733655700000094
Δ t before start-up of the method1Time fault phase voltage fundamental phasor
Figure BDA0001733655700000095
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'IIIThe method comprises the following steps:
according to zero sequence current
Figure BDA0001733655700000096
And positive sequence current phasor
Figure BDA0001733655700000097
Establishing a power flow direction criterion,the formula of the trend direction criterion is as follows:
Figure BDA0001733655700000091
wherein, F is1The range of F is less than or equal to minus 60 degrees1≤60°；
According to zero sequence current
Figure BDA0001733655700000098
And positive sequence voltage phasor
Figure BDA0001733655700000099
Establishing fault transition resistance criterion F2The formula is as follows:
Figure BDA0001733655700000092
wherein, F is2In the range of-D.ltoreq.F2D is less than or equal to D, when C isLWhen the ratio is larger than m, the ratio is,
Figure BDA00017336557000000910
when C is presentLWhen the thickness is less than or equal to m,
Figure BDA00017336557000000911
n is the set resistivity, CLThe length of the actual power grid line is the length of the actual power grid line, and m is the set length value of the power grid line;
when determined according to the calculation
Figure BDA00017336557000000912
And positive sequence current phasor
Figure BDA00017336557000000913
Obtained F1The value of F is not more than 60 degrees1Less than or equal to 60 degrees and determined according to calculation
Figure BDA00017336557000000914
And positive sequence voltage phasor
Figure BDA00017336557000000915
Obtained F2Has a value of-D. ltoreq. F2When D is less than or equal to D, according to fault phase voltage fundamental wave phasor
Figure BDA00017336557000000916
Δ t before start-up of the method1Time fault phase voltage fundamental phasor
Figure BDA00017336557000000917
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'IIIThe formula of (1) is:
Figure BDA0001733655700000093
when determined according to the calculation
Figure BDA00017336557000000918
And positive sequence current phasor
Figure BDA00017336557000000919
Obtained F1The value of F is more than or equal to 60 degrees1Less than or equal to 60 degrees, or zero sequence current determined according to calculation
Figure BDA00017336557000000920
And positive sequence voltage phasor
Figure BDA00017336557000000921
Obtained F2Has a value of-D. ltoreq. F2And when the voltage is less than or equal to D, ending the voltage acceleration method.
Fig. 2 is a schematic structural diagram of a voltage accelerating device for time-limited distance protection of a power grid line according to a preferred embodiment of the invention. As shown in fig. 2, the voltage accelerating device 200 for variable time-limit distance protection of the grid line according to the preferred embodiment includes:
a parameter setting unit 201 for setting a margin coefficient K1And the action time limit t of the original distance protection III sectionIIIResistance coefficient N, length C of actual grid lineLAnd a grid line length value m.
A data acquisition unit 202 for acquiring instantaneous values of secondary values of three-phase voltage and current at a variable time-limit distance protection installation site, and determining a voltage fundamental wave phasor value according to the instantaneous values of the secondary values of the three-phase voltage
Figure BDA0001733655700000104
Determining the current fundamental wave phasor value according to the instantaneous value of the secondary value of the three-phase current
Figure BDA0001733655700000105
And setting the fault phase voltage fundamental phasor as
Figure BDA0001733655700000106
A voltage fundamental phasor value having a value equal to the faulted phase;
a first calculation unit 203 for protecting the phasor value of the fundamental wave of the voltage at the installation site according to the faulted phase and the variable time-limited distance
Figure BDA0001733655700000107
Calculating positive sequence voltage phasor
Figure BDA0001733655700000108
A second calculation unit 204 for protecting the current fundamental phasor value at the installation according to a variable time-limited distance
Figure BDA0001733655700000109
Calculating zero sequence current
Figure BDA00017336557000001010
And, protecting the current fundamental phasor value at the installation site according to the faulted phase and the variable time-limited distance
Figure BDA00017336557000001011
Positive sequence current phasor
Figure BDA00017336557000001012
A third calculation unit 205 for calculating a current according to the zero sequence current
Figure BDA00017336557000001013
And positive sequence current phasor
Figure BDA00017336557000001014
The determined value does not satisfy the established flow direction criterion F1And according to the zero sequence current
Figure BDA00017336557000001015
And positive sequence voltage phasor
Figure BDA00017336557000001016
The determined value satisfies the established fault transition resistance criterion F2According to the fault phase voltage fundamental wave phasor
Figure BDA00017336557000001017
Before the device starts Δ t1Time fault phase voltage fundamental phasor
Figure BDA00017336557000001018
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'III。
Preferably, the first calculation unit 203 protects the phasor value of the voltage fundamental wave at the installation according to the failed phase and the variable time-limit distance
Figure BDA00017336557000001019
Calculating positive sequence voltage phasor
Figure BDA00017336557000001020
The method comprises the following steps:
when the fault is A phase, the positive sequence voltage phasor
Figure BDA00017336557000001021
The calculation formula of (2) is as follows:
Figure BDA0001733655700000101
when the failed phase is B phase, the positive sequence voltage phasor
Figure BDA00017336557000001022
The calculation formula of (2) is as follows:
Figure BDA0001733655700000102
positive sequence voltage phasor when C phase is failed
Figure BDA00017336557000001023
The calculation formula of (2) is as follows:
Figure BDA0001733655700000103
preferably, the second calculation unit 204 protects the phasor value of the current fundamental wave at the installation according to the variable time-limited distance
Figure BDA00017336557000001024
Calculating zero sequence current
Figure BDA00017336557000001025
And protecting the current fundamental phasor value at the installation site according to the faulted phase and the variable time-limit distance
Figure BDA0001733655700000117
Calculating the positive sequence current phasor
Figure BDA0001733655700000118
The formula including the sum positive sequence current phasor is:
zero sequence current
Figure BDA0001733655700000119
The calculation formula of (2) is as follows:
Figure BDA0001733655700000111
when the fault is A phase, the positive sequence current phasor
Figure BDA00017336557000001110
The calculation formula of (2) is as follows:
Figure BDA0001733655700000112
when the fault is B phase, the positive sequence current phasor
Figure BDA00017336557000001111
The calculation formula of (2) is as follows:
Figure BDA0001733655700000113
positive sequence current phasor when C-phase is failed
Figure BDA00017336557000001112
The calculation formula of (2) is as follows:
Figure BDA0001733655700000114
preferably, the third calculation unit 205 calculates the zero sequence current according to the zero sequence current
Figure BDA00017336557000001113
And positive sequence current phasor
Figure BDA00017336557000001114
The determined value does not satisfy the established flow direction criterion F1And according to the zero sequence current
Figure BDA00017336557000001115
And positive sequence voltage phasor
Figure BDA00017336557000001116
The determined value satisfies the established fault transition resistance criterion F2According to the fault phase voltage fundamental wave phasor
Figure BDA00017336557000001117
Before the device starts Δ t1Time fault phase voltage fundamental phasor
Figure BDA00017336557000001118
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'IIIThe method comprises the following steps:
according to zero sequence current
Figure BDA00017336557000001119
And positive sequence current phasor
Figure BDA00017336557000001120
Establishing a power flow direction criterion, wherein the formula of the power flow direction criterion is as follows:
Figure BDA0001733655700000115
wherein, F is1The range of F is less than or equal to minus 60 degrees1≤60°；
According to zero sequence current
Figure BDA00017336557000001121
And positive sequence voltage phasor
Figure BDA00017336557000001122
Establishing fault transition resistance criterion F2The formula is as follows:
Figure BDA0001733655700000116
wherein, F is2In the range of-D.ltoreq.F2D is less than or equal to D, when C isLWhen the ratio is larger than m, the ratio is,
Figure BDA00017336557000001123
when C is presentLWhen the thickness is less than or equal to m,
Figure BDA00017336557000001124
n is a set resistance coefficient, and m is a set line length value;
when determined according to the calculation
Figure BDA00017336557000001125
And positive sequence current phasor
Figure BDA00017336557000001126
Obtained F1The value of F is not more than 60 degrees1Less than or equal to 60 degrees and determined according to calculation
Figure BDA00017336557000001127
And positive sequence voltage phasor
Figure BDA00017336557000001128
Obtained F2Has a value of-D. ltoreq. F2When D is less than or equal to D, according to fault phase voltage fundamental wave phasor
Figure BDA00017336557000001129
Before the device starts Δ t1Time fault phase voltage fundamental phasor
Figure BDA0001733655700000122
And a set margin coefficient K1And the action time limit t of the original distance protection III sectionIIICalculating the corrected distance protection III section operation time t'IIIThe formula of (1) is:
Figure BDA0001733655700000121
when determined according to the calculation
Figure BDA0001733655700000123
And positive sequence current phasor
Figure BDA0001733655700000124
Obtained F1The value of F is more than or equal to 60 degrees1Less than or equal to 60 degrees, or zero sequence current determined according to calculation
Figure BDA0001733655700000125
And positive sequence voltage phasor
Figure BDA0001733655700000126
Obtained F2Has a value of-D. ltoreq. F2And when the voltage is less than or equal to D, the voltage accelerating device finishes the operation.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (9)

1.一种用于电网线路的变时限距离保护的电压加速方法，其特征在于，所述方法包括：1. a voltage acceleration method for variable time limit distance protection of power grid lines, characterized in that the method comprises: 采集变时限距离保护安装处的三相电压和电流二次值的瞬时值，根据所述三相电压二次值的瞬时值确定电压基波相量值
Figure FDA0001733655690000011
根据所述三相电流二次值的瞬时值确定电流基波相量值
Figure FDA0001733655690000012
并设置故障相电压基波相量为
Figure FDA0001733655690000013
其值等于发生故障的相的电压基波相量值；Collect the instantaneous values of the three-phase voltage and current secondary values at the installation location of the variable-time-limited distance protection, and determine the voltage fundamental wave phasor value according to the instantaneous values of the three-phase voltage secondary values
Figure FDA0001733655690000011
Determine the current fundamental wave phasor value according to the instantaneous value of the three-phase current secondary value
Figure FDA0001733655690000012
And set the fault phase voltage fundamental wave phasor as
Figure FDA0001733655690000013
Its value is equal to the voltage fundamental phasor value of the faulted phase; 根据发生故障的相和变时限距离保护安装处的电压基波相量值
Figure FDA0001733655690000014
Figure FDA0001733655690000015
计算正序电压相量
Figure FDA0001733655690000016
Voltage fundamental phasor value at the installation according to the faulted phase and time-varying distance protection
Figure FDA0001733655690000014
Figure FDA0001733655690000015
Calculate the positive sequence voltage phasor
Figure FDA0001733655690000016
 根据变时限距离保护安装处的电流基波相量值
Figure FDA0001733655690000017
计算零序电流
Figure FDA0001733655690000018
以及根据发生故障的相和变时限距离保护安装处的电流基波相量值
Figure FDA0001733655690000019
Figure FDA00017336556900000110
计算正序电流相量
Figure FDA00017336556900000111
According to the current fundamental wave phasor value of the variable time distance protection installation
Figure FDA0001733655690000017
Calculate zero sequence current
Figure FDA0001733655690000018
and the current fundamental phasor value at the protection installation according to the faulted phase and the time-varying distance
Figure FDA0001733655690000019
Figure FDA00017336556900000110
Calculate the positive sequence current phasor
Figure FDA00017336556900000111
 当根据所述零序电流
Figure FDA00017336556900000112
和正序电流相量
Figure FDA00017336556900000113
确定的值不满足建立的潮流方向判据F1，且根据所述零序电流
Figure FDA00017336556900000114
和正序电压相量
Figure FDA00017336556900000115
确定的值满足建立的故障过渡电阻判据F2时，根据故障相电压基波相量
Figure FDA00017336556900000116
所述方法启动前Δt1时刻故障相电压基波相量
Figure FDA00017336556900000117
以及设置的裕度系数K1和原距离保护III段的动作时限tIII计算修正后的距离保护III段动作时限t′III。When according to the zero sequence current
Figure FDA00017336556900000112
and positive sequence current phasors
Figure FDA00017336556900000113
The determined value does not satisfy the established power flow direction criterion F 1 , and according to the zero sequence current
Figure FDA00017336556900000114
and positive sequence voltage phasors
Figure FDA00017336556900000115
When the determined value satisfies the established fault transition resistance criterion F 2 , according to the fault phase voltage fundamental wave phasor
Figure FDA00017336556900000116
The fundamental wave phasor of the faulty phase voltage at the moment Δt 1 before the method starts
Figure FDA00017336556900000117
As well as the set margin coefficient K 1 and the action time limit t III of the original distance protection stage III, the revised action time limit t′ III of the distance protection stage III is calculated. 2.根据权利要求1所述的方法，其特征在于，所述根据发生故障的相和变时限距离保护安装处的电压基波相量值
Figure FDA00017336556900000118
计算正序电压相量
Figure FDA00017336556900000119
的公式为包括：2 . The method according to claim 1 , wherein the voltage fundamental wave phasor value at the installation location is protected according to the faulted phase and the time-varying distance. 3 .
Figure FDA00017336556900000118
Calculate the positive sequence voltage phasor
Figure FDA00017336556900000119
The formula is to include: 当发生故障的是A相时，正序电压相量
Figure FDA00017336556900000120
的计算公式为：When the fault is A-phase, the positive sequence voltage phasor
Figure FDA00017336556900000120
The calculation formula is:
Figure FDA00017336556900000121
Figure FDA00017336556900000121
 当发生故障的是B相时，正序电压相量
Figure FDA00017336556900000122
的计算公式为：When the fault is B-phase, the positive sequence voltage phasor
Figure FDA00017336556900000122
The calculation formula is:
Figure FDA00017336556900000123
Figure FDA00017336556900000123
 当发生故障的是C相时，正序电压相量
Figure FDA00017336556900000124
的计算公式为：When the fault is C-phase, the positive sequence voltage phasor
Figure FDA00017336556900000124
The calculation formula is:
Figure FDA00017336556900000125
Figure FDA00017336556900000125
 3.根据权利要求1所述的方法，其特征在于，根据变时限距离保护安装处的电流基波相量值
Figure FDA0001733655690000021
计算零序电流
Figure FDA0001733655690000022
以及根据发生故障的相和变时限距离保护安装处的电流基波相量值
Figure FDA0001733655690000023
计算正序电流相量
Figure FDA0001733655690000024
包括：：3. The method according to claim 1, characterized in that, according to the current fundamental wave phasor value of the variable time limit distance protection installation place
Figure FDA0001733655690000021
Calculate zero sequence current
Figure FDA0001733655690000022
and the current fundamental phasor value at the protection installation according to the faulted phase and the time-varying distance
Figure FDA0001733655690000023
Calculate the positive sequence current phasor
Figure FDA0001733655690000024
include:: 零序电流
Figure FDA0001733655690000025
的计算公式为：Zero sequence current
Figure FDA0001733655690000025
The calculation formula is:
Figure FDA0001733655690000026
Figure FDA0001733655690000026
 当发生故障的是A相时，正序电流相量
Figure FDA0001733655690000027
的计算公式为：When the fault is A-phase, the positive sequence current phasor
Figure FDA0001733655690000027
The calculation formula is:
Figure FDA0001733655690000028
Figure FDA0001733655690000028
 当发生故障的是B相时，正序电流相量
Figure FDA0001733655690000029
的计算公式为：When the fault occurs in phase B, the positive sequence current phasor
Figure FDA0001733655690000029
The calculation formula is:
Figure FDA00017336556900000210
Figure FDA00017336556900000210
 当发生故障的是C相时，正序电流相量
Figure FDA00017336556900000226
的计算公式为：When the fault is C-phase, the positive sequence current phasor
Figure FDA00017336556900000226
The calculation formula is:
Figure FDA00017336556900000211
Figure FDA00017336556900000211
 4.根据权利要求1所述的方法，其特征在于，所述当根据所述零序电流
Figure FDA00017336556900000212
和正序电流相量
Figure FDA00017336556900000213
确定的值不满足建立的潮流方向判据F1，且根据所述零序电流
Figure FDA00017336556900000214
和正序电压相量
Figure FDA00017336556900000215
确定的值满足建立的故障过渡电阻判据F2时，根据故障相电压基波相量
Figure FDA00017336556900000216
所述方法启动前Δt1时刻故障相电压基波相量
Figure FDA00017336556900000217
以及设置的裕度系数K1和原距离保护III段的动作时限tIII计算修正后的距离保护III段动作时限t′III包括：4. The method according to claim 1, characterized in that, when said zero sequence current is
Figure FDA00017336556900000212
and positive sequence current phasors
Figure FDA00017336556900000213
The determined value does not satisfy the established power flow direction criterion F 1 , and according to the zero sequence current
Figure FDA00017336556900000214
and positive sequence voltage phasors
Figure FDA00017336556900000215
When the determined value satisfies the established fault transition resistance criterion F 2 , according to the fault phase voltage fundamental wave phasor
Figure FDA00017336556900000216
The fundamental wave phasor of the faulty phase voltage at the moment Δt 1 before the method starts
Figure FDA00017336556900000217
As well as the set margin coefficient K 1 and the original action time limit t III of distance protection stage III, the calculated and corrected action time limit t′ III of distance protection stage III includes: 根据零序电流
Figure FDA00017336556900000218
和正序电流相量
Figure FDA00017336556900000219
建立潮流方向判据，所述潮流方向判据的公式为：According to the zero sequence current
Figure FDA00017336556900000218
and positive sequence current phasors
Figure FDA00017336556900000219
A flow direction criterion is established, and the formula of the flow direction criterion is:
Figure FDA00017336556900000220
Figure FDA00017336556900000220
 其中，所述F1的范围为-60°≤F1≤60°；Wherein, the range of F 1 is -60°≤F 1 ≤60°; 根据零序电流
Figure FDA00017336556900000221
和正序电压相量
Figure FDA00017336556900000222
建立故障过渡电阻判据F2，其公式为：According to the zero sequence current
Figure FDA00017336556900000221
and positive sequence voltage phasors
Figure FDA00017336556900000222
The fault transition resistance criterion F 2 is established, and its formula is:
Figure FDA00017336556900000223
Figure FDA00017336556900000223
 其中，所述F2的范围为-D≤F2≤D，当CL＞m时，
Figure FDA00017336556900000224
当CL≤m时，
Figure FDA00017336556900000225
所述N为设置的电阻系数，CL为实际电网线路的长度，m为设置的电网线路长度值；Wherein, the range of F 2 is -D≤F 2 ≤D, and when C L >m,
Figure FDA00017336556900000224
When C L ≤ m,
Figure FDA00017336556900000225
The N is the set resistance coefficient, CL is the length of the actual power grid line, and m is the set power grid line length value; 当根据计算确定的零序电流
Figure FDA0001733655690000031
和正序电流相量
Figure FDA0001733655690000032
得到的F1的值不满足60°≤F1≤60°，且根据计算确定的零序电流
Figure FDA0001733655690000033
和正序电压相量
Figure FDA0001733655690000034
得到的F2的值满足-D≤F2≤D时，根据故障相电压基波相量
Figure FDA0001733655690000035
所述方法启动前Δt1时刻故障相电压基波相量
Figure FDA0001733655690000036
以及设置的裕度系数K1和原距离保护III段的动作时限tIII计算修正后的距离保护III段动作时限t′III的公式为：When the zero-sequence current determined according to the calculation
Figure FDA0001733655690000031
and positive sequence current phasors
Figure FDA0001733655690000032
The obtained value of F 1 does not satisfy 60°≤F 1 ≤60°, and the zero-sequence current determined by calculation
Figure FDA0001733655690000033
and positive sequence voltage phasors
Figure FDA0001733655690000034
When the obtained value of F 2 satisfies -D≤F 2 ≤D, according to the fundamental wave phasor of the fault phase voltage
Figure FDA0001733655690000035
The fundamental wave phasor of the faulty phase voltage at the moment Δt 1 before the method starts
Figure FDA0001733655690000036
As well as the set margin coefficient K 1 and the original action time limit t III of distance protection stage III, the formula for calculating the revised action time limit of distance protection stage III stage t′ III is:
Figure FDA0001733655690000037
Figure FDA0001733655690000037
 当根据计算确定的零序电流
Figure FDA0001733655690000038
和正序电流相量
Figure FDA0001733655690000039
得到的F1的值满足60°≤F1≤60°时，或者根据计算确定的零序电流
Figure FDA00017336556900000310
和正序电压相量
Figure FDA00017336556900000311
得到的F2的值不满足-D≤F2≤D时，所述电压加速方法结束。When the zero-sequence current determined according to the calculation
Figure FDA0001733655690000038
and positive sequence current phasors
Figure FDA0001733655690000039
When the obtained value of F 1 satisfies 60°≤F 1 ≤60°, or the zero-sequence current determined by calculation
Figure FDA00017336556900000310
and positive sequence voltage phasors
Figure FDA00017336556900000311
When the obtained value of F 2 does not satisfy -D≤F 2 ≤D, the voltage acceleration method ends. 5.一种用于电网线路的变时限距离保护的电压加速装置，其特征在于，所述装置包括：5. A voltage acceleration device for variable time limit distance protection of power grid lines, characterized in that the device comprises: 数据采集单元，其用于采集变时限距离保护安装处的三相电压和电流二次值的瞬时值，根据所述三相电压二次值的瞬时值确定电压基波相量值
Figure FDA00017336556900000312
根据所述三相电流二次值的瞬时值确定电流基波相量值
Figure FDA00017336556900000313
Figure FDA00017336556900000314
并设置故障相电压基波相量为
Figure FDA00017336556900000315
其值等于发生故障的相的电压基波相量值；A data acquisition unit, which is used to collect the instantaneous values of the three-phase voltage and current secondary values at the installation location of the variable-time-limited distance protection, and determine the voltage fundamental wave phasor value according to the instantaneous values of the three-phase voltage secondary values
Figure FDA00017336556900000312
Determine the current fundamental wave phasor value according to the instantaneous value of the three-phase current secondary value
Figure FDA00017336556900000313
Figure FDA00017336556900000314
And set the fault phase voltage fundamental wave phasor as
Figure FDA00017336556900000315
Its value is equal to the voltage fundamental phasor value of the faulted phase; 第一计算单元，其用于根据发生故障的相和变时限距离保护安装处的电压基波相量值
Figure FDA00017336556900000316
计算正序电压相量
Figure FDA00017336556900000317
A first calculation unit for protecting the voltage fundamental wave phasor value at the installation according to the faulted phase and the time-varying distance
Figure FDA00017336556900000316
Calculate the positive sequence voltage phasor
Figure FDA00017336556900000317
 第二计算单元，其用于根据变时限距离保护安装处的电流基波相量值
Figure FDA00017336556900000318
计算零序电流
Figure FDA00017336556900000319
以及根据发生故障的相和变时限距离保护安装处的电流基波相量值
Figure FDA00017336556900000320
计算正序电流相量
Figure FDA00017336556900000321
The second calculation unit, which is used to protect the current fundamental wave phasor value at the installation location according to the variable time limit distance
Figure FDA00017336556900000318
Calculate zero sequence current
Figure FDA00017336556900000319
and the current fundamental phasor value at the protection installation according to the faulted phase and the time-varying distance
Figure FDA00017336556900000320
Calculate the positive sequence current phasor
Figure FDA00017336556900000321
 第三计算单元，其用于当根据所述零序电流
Figure FDA00017336556900000322
和正序电流相量
Figure FDA00017336556900000323
确定的值不满足建立的潮流方向判据F1，且根据所述零序电流
Figure FDA00017336556900000324
和正序电压相量
Figure FDA00017336556900000325
确定的值满足建立的故障过渡电阻判据F2时，根据故障相电压基波相量
Figure FDA00017336556900000326
所述装置启动前Δt1时刻故障相电压基波相量
Figure FDA00017336556900000327
以及设置的裕度系数K1和原距离保护III段的动作时限tIII计算修正后的距离保护III段动作时限t′III。A third calculation unit, which is used when the zero-sequence current according to the
Figure FDA00017336556900000322
and positive sequence current phasors
Figure FDA00017336556900000323
The determined value does not satisfy the established power flow direction criterion F 1 , and according to the zero sequence current
Figure FDA00017336556900000324
and positive sequence voltage phasors
Figure FDA00017336556900000325
When the determined value satisfies the established fault transition resistance criterion F 2 , according to the fault phase voltage fundamental wave phasor
Figure FDA00017336556900000326
The fundamental wave phasor of the voltage of the faulty phase at time Δt 1 before the start of the device
Figure FDA00017336556900000327
As well as the set margin coefficient K 1 and the action time limit t III of the original distance protection stage III, the revised action time limit t′ III of the distance protection stage III is calculated. 6.根据权利要求5所述的装置，其特征在于，所述装置还包括参数设置单元，其用于设置裕度系数K1、原距离保护III段的动作时限tIII、电阻系数N、实际电网线路的长度CL、以及设置的电网线路长度值m。6 . The device according to claim 5 , wherein the device further comprises a parameter setting unit, which is used to set the margin coefficient K 1 , the action time limit t III of the original distance protection stage III, the resistance coefficient N, the actual The length CL of the grid line, and the set grid line length value m. 7.根据权利要求6所述的装置，其特征在于，所述第一计算单元根据发生故障的相和变时限距离保护安装处的电压基波相量值
Figure FDA0001733655690000041
计算正序电压相量
Figure FDA0001733655690000042
的公式为包括：7 . The device according to claim 6 , wherein the first calculation unit is based on the phase in which the fault occurs and the voltage fundamental wave phasor value at the time-varying distance protection installation location. 8 .
Figure FDA0001733655690000041
Calculate the positive sequence voltage phasor
Figure FDA0001733655690000042
The formula is to include: 当发生故障的是A相时，正序电压相量
Figure FDA0001733655690000043
的计算公式为：When the fault is A-phase, the positive sequence voltage phasor
Figure FDA0001733655690000043
The calculation formula is:
Figure FDA0001733655690000044
Figure FDA0001733655690000044
 当发生故障的是B相时，正序电压相量
Figure FDA0001733655690000045
的计算公式为：When the fault is B-phase, the positive sequence voltage phasor
Figure FDA0001733655690000045
The calculation formula is:
Figure FDA0001733655690000046
Figure FDA0001733655690000046
 当发生故障的是C相时，正序电压相量
Figure FDA0001733655690000047
的计算公式为：When the fault is C-phase, the positive sequence voltage phasor
Figure FDA0001733655690000047
The calculation formula is:
Figure FDA0001733655690000048
Figure FDA0001733655690000048
 8.根据权利要求6所述的装置，其特征在于，所述第二计算单元根据变时限距离保护安装处的电流基波相量值
Figure FDA0001733655690000049
计算零序电流
Figure FDA00017336556900000410
以及根据发生故障的相和变时限距离保护安装处的电流基波相量值
Figure FDA00017336556900000411
计算正序电流相量
Figure FDA00017336556900000412
包括：和正序电流相量的公式为：8 . The device according to claim 6 , wherein the second calculation unit protects the current fundamental wave phasor value according to the variable time limit distance at the installation location. 9 .
Figure FDA0001733655690000049
Calculate zero sequence current
Figure FDA00017336556900000410
and the current fundamental phasor value at the protection installation according to the faulted phase and the time-varying distance
Figure FDA00017336556900000411
Calculate the positive sequence current phasor
Figure FDA00017336556900000412
Including: and the formula of positive sequence current phasor is: 零序电流
Figure FDA00017336556900000413
的计算公式为：Zero sequence current
Figure FDA00017336556900000413
The calculation formula is:
Figure FDA00017336556900000414
Figure FDA00017336556900000414
 当发生故障的是A相时，正序电流相量
Figure FDA00017336556900000415
的计算公式为：When the fault is A-phase, the positive sequence current phasor
Figure FDA00017336556900000415
The calculation formula is:
Figure FDA00017336556900000416
Figure FDA00017336556900000416
 当发生故障的是B相时，正序电流相量
Figure FDA00017336556900000417
的计算公式为：When the fault occurs in phase B, the positive sequence current phasor
Figure FDA00017336556900000417
The calculation formula is:
Figure FDA00017336556900000418
Figure FDA00017336556900000418
 当发生故障的是C相时，正序电流相量
Figure FDA00017336556900000419
的计算公式为：When the fault is C-phase, the positive sequence current phasor
Figure FDA00017336556900000419
The calculation formula is:
Figure FDA00017336556900000420
Figure FDA00017336556900000420
 9.根据权利要求6所述的装置，其特征在于，所述第三计算单元根据所述零序电流
Figure FDA0001733655690000051
和正序电流相量
Figure FDA0001733655690000052
确定的值不满足建立的潮流方向判据F1，且根据所述零序电流
Figure FDA0001733655690000053
和正序电压相量
Figure FDA0001733655690000054
确定的值满足建立的故障过渡电阻判据F2时，根据故障相电压基波相量
Figure FDA0001733655690000055
所述装置启动前Δt1时刻故障相电压基波相量
Figure FDA0001733655690000056
以及设置的裕度系数K1和原距离保护III段的动作时限tIII计算修正后的距离保护III段动作时限t′III包括：9 . The device according to claim 6 , wherein the third calculation unit is based on the zero-sequence current. 10 .
Figure FDA0001733655690000051
and positive sequence current phasors
Figure FDA0001733655690000052
The determined value does not satisfy the established power flow direction criterion F 1 , and according to the zero sequence current
Figure FDA0001733655690000053
and positive sequence voltage phasors
Figure FDA0001733655690000054
When the determined value satisfies the established fault transition resistance criterion F 2 , according to the fault phase voltage fundamental wave phasor
Figure FDA0001733655690000055
The fundamental wave phasor of the voltage of the faulty phase at time Δt 1 before the start of the device
Figure FDA0001733655690000056
As well as the set margin coefficient K 1 and the original action time limit t III of distance protection stage III, the calculated and corrected action time limit t′ III of distance protection stage III includes: 根据零序电流
Figure FDA0001733655690000057
和正序电流相量
Figure FDA0001733655690000058
建立潮流方向判据，所述潮流方向判据的公式为：According to the zero sequence current
Figure FDA0001733655690000057
and positive sequence current phasors
Figure FDA0001733655690000058
A flow direction criterion is established, and the formula of the flow direction criterion is:
Figure FDA0001733655690000059
Figure FDA0001733655690000059
 其中，所述F1的范围为-60°≤F1≤60°；Wherein, the range of F 1 is -60°≤F 1 ≤60°; 根据零序电流
Figure FDA00017336556900000510
和正序电压相量
Figure FDA00017336556900000511
建立故障过渡电阻判据F2，其公式为：According to the zero sequence current
Figure FDA00017336556900000510
and positive sequence voltage phasors
Figure FDA00017336556900000511
The fault transition resistance criterion F 2 is established, and its formula is:
Figure FDA00017336556900000512
Figure FDA00017336556900000512
 其中，所述F2的范围为-D≤F2≤D，当CL＞m时，
Figure FDA00017336556900000513
当CL≤m时，
Figure FDA00017336556900000514
所述N为设置的电阻系数，m为设置的线路长度值；Wherein, the range of F 2 is -D≤F 2 ≤D, and when C L >m,
Figure FDA00017336556900000513
When C L ≤ m,
Figure FDA00017336556900000514
The N is the set resistance coefficient, and m is the set line length value; 当根据计算确定的零序电流
Figure FDA00017336556900000515
和正序电流相量
Figure FDA00017336556900000516
得到的F1的值不满足60°≤F1≤60°，且根据计算确定的零序电流
Figure FDA00017336556900000517
和正序电压相量
Figure FDA00017336556900000518
得到的F2的值满足-D≤F2≤D时，根据故障相电压基波相量
Figure FDA00017336556900000519
所述装置启动前Δt1时刻故障相电压基波相量
Figure FDA00017336556900000520
以及设置的裕度系数K1和原距离保护III段的动作时限tIII计算修正后的距离保护III段动作时限t′III的公式为：When the zero-sequence current determined according to the calculation
Figure FDA00017336556900000515
and positive sequence current phasors
Figure FDA00017336556900000516
The obtained value of F 1 does not satisfy 60°≤F 1 ≤60°, and the zero-sequence current determined by calculation
Figure FDA00017336556900000517
and positive sequence voltage phasors
Figure FDA00017336556900000518
When the obtained value of F 2 satisfies -D≤F 2 ≤D, according to the fundamental wave phasor of the fault phase voltage
Figure FDA00017336556900000519
The fundamental wave phasor of the voltage of the faulty phase at time Δt 1 before the start of the device
Figure FDA00017336556900000520
As well as the set margin coefficient K 1 and the original action time limit t III of distance protection stage III, the formula for calculating the revised action time limit of distance protection stage III stage t′ III is:
Figure FDA00017336556900000521
Figure FDA00017336556900000521
 当根据计算确定的零序电流
Figure FDA00017336556900000522
和正序电流相量
Figure FDA00017336556900000523
得到的F1的值满足60°≤F1≤60°时，或者根据计算确定的零序电流
Figure FDA00017336556900000524
和正序电压相量
Figure FDA00017336556900000525
得到的F2的值不满足-D≤F2≤D时，所述电压加速装置结束运行。When the zero-sequence current determined according to the calculation
Figure FDA00017336556900000522
and positive sequence current phasors
Figure FDA00017336556900000523
When the obtained value of F 1 satisfies 60°≤F 1 ≤60°, or the zero-sequence current determined by calculation
Figure FDA00017336556900000524
and positive sequence voltage phasors
Figure FDA00017336556900000525
When the obtained value of F 2 does not satisfy -D≤F 2 ≤D, the voltage acceleration device ends the operation.
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