CN105527543A - High voltage line longitudinal zero sequence direction discrimination method and device - Google Patents

High voltage line longitudinal zero sequence direction discrimination method and device Download PDF

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Publication number
CN105527543A
CN105527543A CN201610050073.0A CN201610050073A CN105527543A CN 105527543 A CN105527543 A CN 105527543A CN 201610050073 A CN201610050073 A CN 201610050073A CN 105527543 A CN105527543 A CN 105527543A
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China
Prior art keywords
phase voltage
tension line
zero sequence
zero
relative angle
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CN201610050073.0A
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CN105527543B (en
Inventor
倪传坤
李宝伟
靳东晖
樊占峰
李顺昕
聂文海
刘丽
朱正甲
张嵩
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State Grid Corp of China SGCC
Xuji Group Co Ltd
Economic and Technological Research Institute of State Grid Jibei Electric Power Co Ltd
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State Grid Corp of China SGCC
Xuji Group Co Ltd
Economic and Technological Research Institute of State Grid Jibei Electric Power Co Ltd
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Priority to CN201610050073.0A priority Critical patent/CN105527543B/en
Publication of CN105527543A publication Critical patent/CN105527543A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a high voltage line longitudinal zero sequence direction discrimination method and a device. The high voltage line longitudinal zero sequence direction discrimination method comprises steps of determining a first relative angle difference between zero sequence current on one side of the high voltage line and a phase voltage and determining a second relative angle difference between the zero sequence current on other side of the high voltage line and same phase voltage, wherein if the difference value of a first relative angle difference and a second relative angle difference is in a preset angle difference range, the direction of the longitudinal zero sequence direction is a positive direction, otherwise the longitudinal zero sequence direction is the negative direction. When one phase voltage has PT disconnection, the other phase voltage can be utilized to perform determination in order to avoid the locking zero sequence direction protection problem when the three-phase PT is disconnected. In high resistance fault, the invention avoids the problem that the zero sequence voltage is small and the sensitivity is not enough, which causes the incorrect operation of the zero sequence direction member and solves the problem of the false operation of the zero sequence direction protection caused by the non-faulted line affected by the faulted zero sequence mutual inductance which is related to the weak current and strong magnetic.

Description

A kind of high-tension line vertical connection zero sequence direction method of discrimination and device
Technical field
The present invention relates to Relay Protection Technology in Power System field, particularly a kind of high-tension line vertical connection zero sequence direction method of discrimination and device.
Background technology
Current high-tension line pilot zero sequence direction relay is mainly for the protection of single-phase high-impedance; zero-sequence direction component adopts and differentiates the residual voltage of high-tension line side and the phase compare result of zero-sequence current; when 90 °, advanced residual voltage direction, zero-sequence current direction; then think that vertical connection zero sequence direction is positive dirction, zero-sequence pilot relay protection can action.Adopt zero-sequence direction component to carry out pilot zero sequence direction relay and there is highly sensitive feature, but also there is following problem:
General after PT (PotentialTransforme, voltage transformer (VT)) secondary circuit disconnection fault occurs protective device, zero-sequence pilot relay protection will be blocked, then in generating region during high resistive fault, and zero-sequence pilot relay protection will tripping;
When in near-end generating region, high-tension line side during high resistance earthing fault, the residual voltage amplitude that distal embolic protection collects may be lower, and now the direction of residual voltage is insincere, and vertical connection zero sequence positive dirction will tripping;
In addition; when same bar high-tension line has light current strong magnetic contact feature; when ground connection unbalanced fault occurs a high-tension line; an other high-tension line will affect by the zero-sequence mutual inductance between high-tension line; and cause the zero-sequence current of the high-tension line both sides perfected all to meet the feature in 90 °, residual voltage direction, advanced each side, thus cause zero-sequence pilot relay protection misoperation.
Summary of the invention
Embodiments provide a kind of high-tension line vertical connection zero sequence direction method of discrimination, adopt and the relative angle difference of the same phase voltage in the zero-sequence current of high-tension line both sides and three-phase voltage is compared, can solve in prior art and adopt the technical matters existing for the residual voltage of high-tension line side and the phase compare result of zero-sequence current differentiated.The method comprises:
Determine that the first relative angle of the phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor;
Determine that the second relative angle of the phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor;
If the difference of the first relative angle difference and the second relative angle difference is in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage.
In one embodiment, the phase voltage in the phase voltage in the three-phase voltage of described high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage, comprising:
If A phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is A phase voltage;
If A phase voltage is less than 30V, and B phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is B phase voltage;
If B phase voltage is less than 30V, and C phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is C phase voltage.
In one embodiment, also comprise:
If C phase voltage is less than 30V, then determine that vertical connection zero sequence direction is in the other direction.
In one embodiment, the first relative angle difference of the phase voltage in the zero-sequence current of described high-tension line side and three-phase voltage is determined by following formula:
X = arg U · I o ;
Second relative angle difference of the phase voltage in the zero-sequence current of described high-tension line opposite side and three-phase voltage is determined by following formula:
Y = arg U · I o ;
Wherein, X is that the first relative angle of a phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor; Y is that the second relative angle of a phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor; I ofor zero-sequence current, for the arbitrary phase voltage in three-phase voltage; When time, X=Y=-1.
In one embodiment, described predetermined angle difference scope is (-60 °, 60 °).
In one embodiment, if the difference of described first relative angle difference and the second relative angle difference is in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction, comprising:
Work as X a>-1 and Y aduring >-1, if-60 ° of < X a-Y a< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X a=-1 or Y a=-1, X b>-1 and Y bduring >-1, if-60 ° of < X b-Y b< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X b=-1 or Y b=-1, X c>-1 and Y cduring >-1, if-60 ° of < X c-Y c< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, X a, X b, X cthe zero-sequence current being respectively high-tension line side is poor with the relative angle of A phase, B phase, C phase voltage;
Y a, Y b, Y cthe zero-sequence current being respectively high-tension line opposite side is poor with the relative angle of A phase, B phase, C phase voltage.
The embodiment of the present invention additionally provides a kind of high-tension line vertical connection zero sequence direction discriminating gear, adopt and the relative angle difference of the same phase voltage in the zero-sequence current of high-tension line both sides and three-phase voltage is compared, can solve in prior art and adopt the technical matters existing for the residual voltage of high-tension line side and the phase compare result of zero-sequence current differentiated.This device comprises:
First relative angle difference determination module, poor for determining the first relative angle of the phase voltage in the zero-sequence current of high-tension line side and three-phase voltage;
Second relative angle difference determination module, poor for determining the second relative angle of the phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage;
Vertical connection zero sequence direction determination module, if for the difference of the first relative angle difference and the second relative angle difference in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage.
In one embodiment, the phase voltage in the phase voltage in the three-phase voltage of described high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage, comprising:
If A phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is A phase voltage;
If A phase voltage is less than 30V, and B phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is B phase voltage;
If B phase voltage is less than 30V, and C phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is C phase voltage.
In one embodiment, also comprise:
If C phase voltage is less than 30V, then determine that vertical connection zero sequence direction is in the other direction.
In one embodiment, described first relative angle difference determination module specifically for:
Poor by the first relative angle of the phase voltage in the zero-sequence current of following formula determination high-tension line side and three-phase voltage:
X = arg U &CenterDot; I o ;
Described second relative angle difference determination module specifically for:
Poor by the second relative angle of the phase voltage in the zero-sequence current of following formula determination high-tension line opposite side and three-phase voltage:
Y = arg U &CenterDot; I o ;
Wherein, X is that the first relative angle of a phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor; Y is that the second relative angle of a phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor; I ofor zero-sequence current, for the arbitrary phase voltage in three-phase voltage; When time, X=Y=-1.
In one embodiment, described predetermined angle difference scope is (-60 °, 60 °).
In one embodiment, described vertical zero sequence direction determination module specifically for:
Work as X a>-1 and Y aduring >-1, if-60 ° of < X a-Y a< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X a=-1 or Y a=-1, X b>-1 and Y bduring >-1, if-60 ° of < X b-Y b< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X b=-1 or Y b=-1, X c>-1 and Y cduring >-1, if-60 ° of < X c-Y c< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, X a, X b, X cthe zero-sequence current being respectively high-tension line side is poor with the relative angle of A phase, B phase, C phase voltage;
Y a, Y b, Y cthe zero-sequence current being respectively high-tension line opposite side is poor with the relative angle of A phase, B phase, C phase voltage.
In embodiments of the present invention, the present invention adopts the first relative angle of the zero-sequence current of high-tension line side and a certain phase voltage poor, compare with the zero-sequence current of high-tension line opposite side and the second relative angle difference of same phase voltage, judge that vertical connection zero sequence direction is positive dirction or opposite direction, when wherein there is PT broken string in a phase voltage, other phase voltage can also be utilized to proceed to differentiate, therefore can avoid locking zero-sequence voltage injection problem when non-three-phase PT breaks that occurs; When high resistive fault, phase voltage is used to differentiate the zero-sequence direction component incorrect operation problem that residual voltage also can be avoided to cause not compared with sluggishness; The phase differential of corresponding phase voltage and zero-sequence current that the present invention's key takes high-tension line both sides compares differentiation zero sequence direction, fundamentally solves the zero-sequence voltage injection misoperation problem that non-fault line that the strong magnetic of same bar light current contacts causes by the impact of faulty line zero-sequence mutual inductance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of high-tension line vertical connection zero sequence direction method of discrimination process flow diagram that the embodiment of the present invention provides;
Fig. 2 is the direction schematic diagram of both sides zero-sequence current in A phase fault in a kind of high-tension line district of providing of the embodiment of the present invention;
Fig. 3 is a kind of high-tension line N side that provides of the embodiment of the present invention direction schematic diagram of both sides zero-sequence current in district A phase fault behind;
Fig. 4 is a kind of high-tension line M side that provides of the embodiment of the present invention direction schematic diagram of both sides zero-sequence current in district A phase fault behind;
Fig. 5 is a kind of high-tension line vertical connection zero sequence direction discriminating gear structural drawing that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Existing electric system high pressure, supertension line pilot zero sequence direction relay are for the protection of circuit single-phase high-impedance; zero-sequence direction component adopts and differentiates the residual voltage of high-tension line side and the phase compare result of zero-sequence current; but the method is subject to that residual voltage sensitivity is not enough, PT break impact, and under the same bar line condition contacted at the strong magnetic of light current, the zero sequence direction of routine can be judged by accident and caused protection misoperation.
For above-mentioned prior art Problems existing; the present invention proposes a kind of high-tension line vertical connection zero sequence direction method of discrimination; the method carries out related information transmission based on circuit longitudinal optical-fibre channel; circuit both sides protective device can pass through optical-fibre channel transportation simulator numerical value; the zero-sequence current of this side and the relative phase relation of phase voltage are transferred to offside, then carry out comprehensive distinguishing fault direction in conjunction with the relative phase relation result of offside.
Concrete, as shown in Figure 1, the method comprises high-tension line vertical connection zero sequence direction method of discrimination flow process:
Step 101: determine that the first relative angle of the phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor;
Step 102: determine that the second relative angle of the phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor;
Step 103: if the first relative angle difference and the difference of the second relative angle difference are in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction, zero-sequence pilot relay protection can action; Otherwise vertical connection zero sequence direction is that zero-sequence pilot relay protection is failure to actuate in the other direction;
Wherein, the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage.
During concrete enforcement, need the first relative angle difference of high-tension line side to utilize vertical connection optical-fibre channel to transfer in the protective device of high-tension line opposite side, then the first relative angle difference is done difference with the second relative angle difference;
Or, utilize vertical connection optical-fibre channel to transfer to the protective device of high-tension line side the second relative angle difference of high-tension line opposite side, the first relative angle difference done difference with the second relative angle difference.
During concrete enforcement, the foundation proposing the inventive method is:
When in high-tension line generating region during single-phase high-impedance, zero-sequence current flows to high-tension line both sides by trouble spot, consider that high-tension line both sides system zero sequence angle of impedance is substantially identical, therefore zero-sequence current direction in high-tension line both sides is substantially in the same way, as shown in Figure 2.
When high-tension line generation external area error, zero-sequence current flows to high-tension line distally by trouble spot through high-tension line nearside, passing through property of zero-sequence current on high-tension line, and therefore zero-sequence current direction in high-tension line both sides is reverse, as shown in Figures 3 and 4.
When high-tension line generating region, inside and outside high resistance earthing fault, each phase voltage direction of high-tension line both sides remains close in the same way, if high-tension line side (M side) A phase voltage and high-tension line offside (N side) A phase voltage direction are close in the same way, phase differential is less than 30 °.
Because high-tension line both sides protective device can not synchronized sampling, so directly can not carry out phase compare between the zero-sequence current phasor calculated after the protective device collection of high-tension line both sides.But it is synchronous that each phase voltage of the every side of high-tension line is sampled with zero-sequence current, its phasor calculated can carry out phase compare.
The present invention just utilizes above-mentioned feature to carry out.
Wherein, all alphabetical implication in Fig. 2, Fig. 3 and Fig. 4 is respectively:
I oMfor zero-sequence current, the I of high-tension line M side oNfor the zero-sequence current of high-tension line N side;
U aMfor A phase voltage, the U of high-tension line M side aNfor the A phase voltage of high-tension line N side;
U bMfor B phase voltage, the U of high-tension line M side bNfor the B phase voltage of high-tension line N side;
U cMfor C phase voltage, the U of high-tension line M side cNfor the C phase voltage of high-tension line N side.
During concrete enforcement, the phase voltage in the three-phase voltage of the phase voltage in the three-phase voltage of high-tension line side (M side) and high-tension line opposite side (N side) is in-phase voltage, comprising:
If A phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is A phase voltage;
If A phase voltage is less than 30V, and B phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is B phase voltage;
If B phase voltage is less than 30V, and C phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is C phase voltage.
Separately, if C phase voltage is less than 30V, then directly can determine that vertical connection zero sequence direction is in the other direction, without the need to calculating phase angle difference.
During concrete enforcement, the first relative angle difference of the phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is determined by following formula:
X = arg U &CenterDot; I o ;
Second relative angle difference of the phase voltage in the zero-sequence current of described high-tension line opposite side and three-phase voltage is determined by following formula:
Y = arg U &CenterDot; I o ;
Wherein, X is that the first relative angle of a phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor; Y is that the second relative angle of a phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor; I ofor zero-sequence current, for the arbitrary phase voltage in three-phase voltage; When time, X=Y=-1.
Concrete, voltage phasor calculates and adopts the all-round Fourier filtering algorithm of power frequency, and after zero-sequence pilot relay protection starts, 20ms starts to carry out.
When A phase voltage is all got in both sides, relative angle difference is: the scope that phase difference calculating result adopts is 0 ° ~ 360 °.
Only when time, X a=-1, I ofor zero-sequence current, for A phase voltage.
When B phase voltage is all got in both sides, relative angle difference is: the scope that phase difference calculating result adopts is 0 ° ~ 360 °.
Only when time, X b=-1, I ofor zero-sequence current, for B phase voltage.
When C phase voltage is all got in both sides, relative angle difference is: the scope that phase difference calculating result adopts is 0 ° ~ 360 °.
Only when time, X c=-1, I ofor zero-sequence current, for C phase voltage.
Wherein, X a, X b, X cthe zero-sequence current being respectively high-tension line side is poor with the relative angle of A phase, B phase, C phase voltage;
Y a, Y b, Y cthe zero-sequence current being respectively high-tension line opposite side is poor with the relative angle of A phase, B phase, C phase voltage.
During concrete enforcement, if the difference of described first relative angle difference and the second relative angle difference is in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction, comprising:
Work as X a>-1 and Y aduring >-1, if-60 ° of < X a-Y a< 60 °, then vertical connection zero sequence direction is positive dirction, and zero-sequence pilot relay protection can action; Otherwise vertical connection zero sequence direction is that zero-sequence pilot relay protection is failure to actuate in the other direction;
Work as X a=-1 or Y a=-1, X b>-1 and Y bduring >-1, if-60 ° of < X b-Y b< 60 °, then vertical connection zero sequence direction is positive dirction, and zero-sequence pilot relay protection can action; Otherwise vertical connection zero sequence direction is that zero-sequence pilot relay protection is failure to actuate in the other direction;
Work as X b=-1 or Y b=-1, X c>-1 and Y cduring >-1, if-60 ° of < X c-Y c< 60 °, then vertical connection zero sequence direction is positive dirction, and zero-sequence pilot relay protection can action; Otherwise vertical connection zero sequence direction is that zero-sequence pilot relay protection is failure to actuate in the other direction.
Based on same inventive concept, additionally provide a kind of high-tension line vertical connection zero sequence direction discriminating gear in the embodiment of the present invention, as described in the following examples.Indulge principle that connection zero sequence direction discriminating gear deals with problems and high-tension line due to high-tension line and indulge that to join zero sequence direction method of discrimination similar, therefore high-tension line indulges the enforcement joining zero sequence direction discriminating gear can indulge connection zero sequence direction method of discrimination enforcement see high-tension line, repeats part and repeats no more.Following used, term " unit " or " module " can realize the software of predetermined function and/or the combination of hardware.Although the device described by following examples preferably realizes with software, hardware, or the realization of the combination of software and hardware also may and conceived.
Fig. 5 is a kind of structured flowchart that the high-tension line of the embodiment of the present invention indulges connection zero sequence direction discriminating gear, as shown in Figure 5, comprising:
First relative angle difference determination module 501, poor for determining the first relative angle of the phase voltage in the zero-sequence current of high-tension line side and three-phase voltage;
Second relative angle difference determination module 502, poor for determining the second relative angle of the phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage;
Vertical connection zero sequence direction determination module 503, if for the difference of the first relative angle difference and the second relative angle difference in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage.
Below this structure is described.
During concrete enforcement, the phase voltage in the phase voltage in the three-phase voltage of described high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage, comprising:
If A phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is A phase voltage;
If A phase voltage is less than 30V, and B phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is B phase voltage;
If B phase voltage is less than 30V, and C phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is C phase voltage.
During concrete enforcement, also comprise:
If C phase voltage is less than 30V, then determine that vertical connection zero sequence direction is in the other direction.
During concrete enforcement, described first relative angle difference determination module 501 specifically for:
Poor by the first relative angle of the phase voltage in the zero-sequence current of following formula determination high-tension line side and three-phase voltage:
X = arg U &CenterDot; I o ;
Described second relative angle difference determination module 502 specifically for:
Poor by the second relative angle of the phase voltage in the zero-sequence current of following formula determination high-tension line opposite side and three-phase voltage:
Y = arg U &CenterDot; I o ;
Wherein, X is that the first relative angle of a phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor; Y is that the second relative angle of a phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor; I ofor zero-sequence current, for the arbitrary phase voltage in three-phase voltage; When time, X=Y=-1.
During concrete enforcement, described predetermined angle difference scope is (-60 °, 60 °).
During concrete enforcement, described vertical zero sequence direction determination module 503 specifically for:
Work as X a>-1 and Y aduring >-1, if-60 ° of < X a-Y a< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X a=-1 or Y a=-1, X b>-1 and Y bduring >-1, if-60 ° of < X b-Y b< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X b=-1 or Y b=-1, X c>-1 and Y cduring >-1, if-60 ° of < X c-Y c< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, X a, X b, X cthe zero-sequence current being respectively high-tension line side is poor with the relative angle of A phase, B phase, C phase voltage;
Y a, Y b, Y cthe zero-sequence current being respectively high-tension line opposite side is poor with the relative angle of A phase, B phase, C phase voltage.
In sum, the present invention adopts the first relative angle of the zero-sequence current of high-tension line side and a certain phase voltage poor, compare with the zero-sequence current of high-tension line opposite side and the second relative angle difference of same phase voltage, judge that vertical connection zero sequence direction is positive dirction or opposite direction, when wherein there is PT broken string in a phase voltage, other phase voltage can also be utilized to proceed to differentiate, therefore can avoid locking zero-sequence voltage injection problem when non-three-phase PT breaks that occurs; When high resistive fault, phase voltage is used to differentiate the zero-sequence direction component incorrect operation problem that residual voltage also can be avoided to cause not compared with sluggishness; The phase differential of corresponding phase voltage and zero-sequence current that the present invention's key takes high-tension line both sides compares differentiation zero sequence direction, fundamentally solves the zero-sequence voltage injection misoperation problem that non-fault line that the strong magnetic of same bar light current contacts causes by the impact of faulty line zero-sequence mutual inductance.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the process flow diagram of the method for the embodiment of the present invention, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and process flow diagram and/or block scheme and/or square frame.These computer program instructions can being provided to the processor of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computing machine or other programmable data processing device produce device for realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. a high-tension line vertical connection zero sequence direction method of discrimination, is characterized in that, comprising:
Determine that the first relative angle of the phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor;
Determine that the second relative angle of the phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor;
If the difference of the first relative angle difference and the second relative angle difference is in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage.
2. high-tension line as claimed in claim 1 vertical connection zero sequence direction method of discrimination, is characterized in that, the phase voltage in the phase voltage in the three-phase voltage of described high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage, comprising:
If A phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is A phase voltage;
If A phase voltage is less than 30V, and B phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is B phase voltage;
If B phase voltage is less than 30V, and C phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is C phase voltage.
3. high-tension line as claimed in claim 2 vertical connection zero sequence direction method of discrimination, is characterized in that, also comprise:
If C phase voltage is less than 30V, then determine that vertical connection zero sequence direction is in the other direction.
4. high-tension line as claimed in claim 2 vertical connection zero sequence direction method of discrimination, is characterized in that, the first relative angle difference of the phase voltage in the zero-sequence current of described high-tension line side and three-phase voltage is determined by following formula:
X = arg U &CenterDot; I o ;
Second relative angle difference of the phase voltage in the zero-sequence current of described high-tension line opposite side and three-phase voltage is determined by following formula:
Y = arg U &CenterDot; I o ;
Wherein, X is that the first relative angle of a phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor; Y is that the second relative angle of a phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor; I ofor zero-sequence current, for the arbitrary phase voltage in three-phase voltage; When time, X=Y=-1.
5. high-tension line as claimed in claim 4 vertical connection zero sequence direction method of discrimination, is characterized in that, described predetermined angle difference scope is (-60 °, 60 °).
6. high-tension line as claimed in claim 5 vertical connection zero sequence direction method of discrimination, is characterized in that, if the difference of described first relative angle difference and the second relative angle difference is in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction, comprising:
Work as X a>-1 and Y aduring >-1, if-60 ° of < X a-Y a< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X a=-1 or Y a=-1, X b>-1 and Y bduring >-1, if-60 ° of < X b-Y b< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X b=-1 or Y b=-1, X c>-1 and Y cduring >-1, if-60 ° of < X c-Y c< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, X a, X b, X cthe zero-sequence current being respectively high-tension line side is poor with the relative angle of A phase, B phase, C phase voltage;
Y a, Y b, Y cthe zero-sequence current being respectively high-tension line opposite side is poor with the relative angle of A phase, B phase, C phase voltage.
7. a high-tension line vertical connection zero sequence direction discriminating gear, is characterized in that, comprising:
First relative angle difference determination module, poor for determining the first relative angle of the phase voltage in the zero-sequence current of high-tension line side and three-phase voltage;
Second relative angle difference determination module, poor for determining the second relative angle of the phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage;
Vertical connection zero sequence direction determination module, if for the difference of the first relative angle difference and the second relative angle difference in predetermined angle difference scope, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage.
8. high-tension line as claimed in claim 7 vertical connection zero sequence direction discriminating gear, is characterized in that, the phase voltage in the phase voltage in the three-phase voltage of described high-tension line side and the three-phase voltage of high-tension line opposite side is in-phase voltage, comprising:
If A phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is A phase voltage;
If A phase voltage is less than 30V, and B phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is B phase voltage;
If B phase voltage is less than 30V, and C phase voltage is greater than 30V, then the phase voltage in the phase voltage in the three-phase voltage of high-tension line side and the three-phase voltage of high-tension line opposite side is C phase voltage.
9. high-tension line as claimed in claim 8 vertical connection zero sequence direction discriminating gear, is characterized in that, also comprise:
If C phase voltage is less than 30V, then determine that vertical connection zero sequence direction is in the other direction.
10. high-tension line as claimed in claim 8 vertical connection zero sequence direction discriminating gear, is characterized in that, described first relative angle difference determination module specifically for:
Poor by the first relative angle of the phase voltage in the zero-sequence current of following formula determination high-tension line side and three-phase voltage:
X = arg U &CenterDot; I o ;
Described second relative angle difference determination module specifically for:
Poor by the second relative angle of the phase voltage in the zero-sequence current of following formula determination high-tension line opposite side and three-phase voltage:
Y = arg U &CenterDot; I o ;
Wherein, X is that the first relative angle of a phase voltage in the zero-sequence current of high-tension line side and three-phase voltage is poor; Y is that the second relative angle of a phase voltage in the zero-sequence current of high-tension line opposite side and three-phase voltage is poor; I ofor zero-sequence current, for the arbitrary phase voltage in three-phase voltage; When time, X=Y=-1.
11. high-tension lines as claimed in claim 10 vertical connection zero sequence direction discriminating gear, is characterized in that, described predetermined angle difference scope is (-60 °, 60 °).
12. high-tension lines as claimed in claim 11 vertical connection zero sequence direction discriminating gear, is characterized in that, described vertical zero sequence direction determination module specifically for:
Work as X a>-1 and Y aduring >-1, if-60 ° of < X a-Y a< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X a=-1 or Y a=-1, X b>-1 and Y bduring >-1, if-60 ° of < X b-Y b< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Work as X b=-1 or Y b=-1, X c>-1 and Y cduring >-1, if-60 ° of < X c-Y c< 60 °, then vertical connection zero sequence direction is positive dirction; Otherwise vertical connection zero sequence direction is in the other direction;
Wherein, X a, X b, X cthe zero-sequence current being respectively high-tension line side is poor with the relative angle of A phase, B phase, C phase voltage;
Y a, Y b, Y cthe zero-sequence current being respectively high-tension line opposite side is poor with the relative angle of A phase, B phase, C phase voltage.
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