CN101295873B - Medium-voltage power distribution network single-phase ground fault route selection method based on fault procedure analysis - Google Patents
Medium-voltage power distribution network single-phase ground fault route selection method based on fault procedure analysis Download PDFInfo
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- CN101295873B CN101295873B CN2007100401967A CN200710040196A CN101295873B CN 101295873 B CN101295873 B CN 101295873B CN 2007100401967 A CN2007100401967 A CN 2007100401967A CN 200710040196 A CN200710040196 A CN 200710040196A CN 101295873 B CN101295873 B CN 101295873B
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Abstract
The invention provides a single phase grounding fault line selection method for medium voltage distribution networks based on fault process analysis, which comprises the steps of calculating neutral point voltage, determining whether the neutral point voltage exceeds a preset threshold value, diagnosing fault type, determining whether the fault is a single phase grounding fault, describing fault process, positioning line selection area, selecting line for the fault, outputting result and finishing. The method can reflect the process of fault development and evolution intuitively and constitutionally, effectively selects the line for stable grounding with single phase grounding fault time more than 500 milliseconds, and can totally capture and describe transient fault during the fault process.
Description
Technical field
The present invention relates to a kind of fault-line selecting method, relate in particular to a kind of medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process.
Technical background
In the prior art; Route selection for the medium voltage distribution network single phase ground fault; Usually according to single-phase earthing the phenomenon that neutral point of electric network voltage raises appears; And during the ground connection transient state, the stable state information that occur carry out failure line selection, this variant projects of location to earth fault only carries out route selection to the earth fault point.This scheme is bad for high resistance ground or intermittence earth fault line selection validity; Can not carry out route selection in effective route selection interval of fault progression process; And for the time can not the effective route selection of quiet earth greater than 500 milliseconds single phase ground fault; The method that general employing is not handled for the transient earthing fault in addition causes fault all not to be hunted down and to describe.
Summary of the invention
The objective of the invention is to overcome the defective of prior art; And a kind of medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process is provided; It can be directly perceived, essential reflection fault progression, evolution process; For the single phase ground fault time greater than the effective route selection of 500 milliseconds quiet earth, and can all catch and describe for the transient fault in the failure process.
The technical scheme that realizes above-mentioned purpose is: the medium voltage distribution network fault line selection method for single-phase-to-ground fault based on failure process is analyzed wherein, may further comprise the steps:
Step 1: calculate neutral point voltage, promptly, periodically calculate neutral point voltage according to the line voltage information that constantly collects from electrical network;
Step 2: whether judge neutral point voltage above threshold value is set,, judge whether above threshold value is set promptly according to the neutral point voltage that calculates;
If not, promptly neutral point voltage does not surpass threshold value, then gets into step 9;
If promptly neutral point voltage surpasses threshold value, breaks down, and then gets into step 3;
Step 3: tracing trouble type, the i.e. type of the fault that diagnosis occurs;
Step 4: judge whether it is single phase ground fault, the fault type that promptly draws according to diagnosis, whether differentiate is single phase ground fault;
If not, promptly not single phase ground fault, then get into step 8;
If, promptly belong to single phase ground fault, then get into step 5;
Step 5: describe failure process, promptly through the analysis of voltage to neutral, failure process obtains to describe characteristic;
Step 6, the location route selection is interval, and promptly after describing failure process, selection algorithm is interval;
Step 8, the output result promptly exports fault type;
Step 9 finishes.
The above-mentioned medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process, wherein, may further comprise the steps of described step 7:
Step 71: the zero-sequence current to each bar branch road carries out process analysis procedure analysis, promptly the fault that belongs to single-phase earthing is carried out process analysis procedure analysis;
Step 72: judge whether the zero-sequence current data are effective to route selection,, judge whether the zero-sequence current data are effective to route selection promptly according to precalculated reference value;
If invalid, then get into step 721;
Step 721: reject invalid branch road, do not participate in failure line selection;
If effectively, then get into step 73;
Step 73: the stable state route selection, promptly choose the maximum stable state of reference arm amplitude as best route selection state;
The above-mentioned medium voltage distribution network fault line selection method for single-phase-to-ground fault based on the failure process analysis, wherein, the fault type in the described step 3 comprises single phase ground fault, ferro-resonance over-voltage fault, PT fusing fault, other asymmetric earth faults.
Above-mentioned medium voltage distribution network fault line selection method for single-phase-to-ground fault based on the failure process analysis, wherein, the description failure process in the described step 5 is analyzed through the harmonic factor and the form factor of voltage to neutral, wherein:
Harmonic factor λ is the each harmonic of signal and the ratio of effective value,
Wherein A is a signal each harmonic amplitude, subscript i be harmonic wave with respect to the first-harmonic integral multiple, i is an odd number;
Form factor is the filtering factor of morphological filters at different levels.
Above-mentioned medium voltage distribution network fault line selection method for single-phase-to-ground fault based on the failure process analysis, wherein, Φ between steady-state zone is selected through the equilibrium length method that is dominant in the selection algorithm interval in the described step 6, and its algorithm is Φ=Max (L
s, A
s), wherein, the stable state siding-to-siding block length is L
s, the stable state amplitude is A
s, the maximum interval accident analysis interval that is of the equilibrium length of this algorithm.
The above-mentioned medium voltage distribution network fault line selection method for single-phase-to-ground fault based on the failure process analysis, wherein, the line selection algorithm in the described step 7 comprises that stable state harmonic wave method, stable state are than width of cloth phase comparing method, transient state wavelet character method.
The above-mentioned medium voltage distribution network fault line selection method for single-phase-to-ground fault based on the failure process analysis, wherein, described stable state harmonic wave method is 1,3,5,7 power frequency multiple harmonic wave methods.
The above-mentioned medium voltage distribution network fault line selection method for single-phase-to-ground fault based on the failure process analysis, wherein, described transient state wavelet character method comprises energy method and polarity method.
The invention has the beneficial effects as follows: a kind of medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process of the present invention; Adopted the method for failure process; Therefore can carry out route selection in effective route selection interval of fault progression process for high resistance ground or intermittence earth fault line selection, for the single phase ground fault time greater than the effective route selection of 500 milliseconds quiet earth; Transient fault in the failure process can all catch and describe.On the basis of failure process descriptive analysis, locate optimum route selection interval, and then carry out route selection.The present invention carries out failure process to earth fault and describes, analyzes, earth fault as a whole a process describe and analyze, more meet the essential characteristic of fault progression.
Description of drawings
Fig. 1 is the flow chart of the medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process of the present invention;
Fig. 2 is the flow chart that fault is carried out the route selection step of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1, the medium voltage distribution network fault line selection method for single-phase-to-ground fault based on failure process is analyzed may further comprise the steps:
Step 1: calculate neutral point voltage, promptly, periodically calculate neutral point voltage according to the line voltage information that constantly collects from electrical network;
Step 2: whether judge neutral point voltage above threshold value is set,, judge whether above threshold value is set promptly according to the neutral point voltage that calculates;
If not, promptly neutral point voltage does not surpass threshold value, then gets into step 9;
If promptly neutral point voltage surpasses threshold value, breaks down, and then gets into step 3;
Step 3: the tracing trouble type, i.e. the type of the fault that diagnosis occurs comprises single phase ground fault, ferro-resonance over-voltage fault, PT fusing fault, other asymmetric earth faults;
Step 4: judge whether it is single phase ground fault, the fault type that promptly draws according to diagnosis, whether differentiate is single phase ground fault;
If not, promptly not single phase ground fault, then get into step 8;
If, promptly belong to single phase ground fault, then get into step 5;
Step 5: describe failure process, promptly through the harmonic factor and the form factor analysis of voltage to neutral, failure process obtains to describe characteristic, wherein:
Harmonic factor λ is the each harmonic of signal and the ratio of effective value,
Wherein A is a signal each harmonic amplitude, subscript i be harmonic wave with respect to the first-harmonic integral multiple, i is an odd number;
Form factor is the filtering factor of morphological filters at different levels;
Step 6, the location route selection is interval, and promptly after describing failure process, selection algorithm is interval, and the present invention selects Φ between steady-state zone through the equilibrium length method that is dominant, and its algorithm is Φ=Max (L
s, A
s), wherein, the stable state siding-to-siding block length is L
s, the stable state amplitude is A
s, the maximum interval accident analysis interval that is of the equilibrium length of this algorithm;
Step 8, the output result promptly exports fault type;
Step 9 finishes.
See also Fig. 2, the flow chart of step 7 of the present invention be shown among the figure, may further comprise the steps:
Step 71: the zero-sequence current to each bar branch road carries out process analysis procedure analysis, promptly the fault that belongs to single-phase earthing is carried out process analysis procedure analysis;
Step 72: judge whether the zero-sequence current data are effective to route selection,, judge whether the zero-sequence current data are effective to route selection promptly according to precalculated reference value;
If invalid, then get into step 721;
Step 721: reject invalid branch road, do not participate in failure line selection;
If effectively, then get into step 73;
Step 73: the stable state route selection, promptly choose the maximum stable state of reference arm amplitude as best route selection state;
Above embodiment only supplies to explain the present invention's usefulness, but not to the restriction of protection range of the present invention.The technical staff in relevant present technique field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification, and the technical scheme that all are equal to also should belong within the category of the present invention's protection, is limited each claim.
Claims (4)
1. the medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process is characterized in that: may further comprise the steps:
Step 1: calculate neutral point voltage, promptly, periodically calculate neutral point voltage according to the line voltage information that constantly collects from electrical network;
Step 2: whether judge neutral point voltage above threshold value is set,, judge whether above threshold value is set promptly according to the neutral point voltage that calculates;
If not, promptly neutral point voltage does not surpass threshold value, then gets into step 9;
If promptly neutral point voltage surpasses threshold value, breaks down, and then gets into step 3;
Step 3: tracing trouble type, the i.e. type of the fault that diagnosis occurs;
Step 4: judge whether it is single phase ground fault, the fault type that promptly draws according to diagnosis, whether differentiate is single phase ground fault;
If not, promptly not single phase ground fault, then get into step 8;
If, promptly belong to single phase ground fault, then get into step 5;
Step 5: describe failure process, promptly through the analysis of voltage to neutral, failure process obtains to describe characteristic;
Step 6, the location route selection is interval, and promptly after describing failure process, selection algorithm is interval;
Step 7 is carried out route selection to fault, promptly through some line selection algorithms fault is carried out route selection, and relatively each algorithm in the validity of different fault sections to form the active domain of each algorithm in process analysis procedure analysis;
Step 8, the output result promptly exports fault type;
Step 9 finishes,
Description failure process in the described step 5 is analyzed through the harmonic factor and the form factor of voltage to neutral, wherein:
Harmonic factor λ is the each harmonic of signal and the ratio of effective value,
Wherein A is a signal each harmonic amplitude, subscript i be harmonic wave with respect to the first-harmonic integral multiple, i is an odd number;
Form factor is the filtering factor of morphological filters at different levels;
Ф between steady-state zone is selected through the equilibrium length method that is dominant in selection algorithm interval in the described step 6, and its algorithm is Ф=Max (L
s, A
s), wherein, the stable state siding-to-siding block length is L
s, the stable state amplitude is A
s, the maximum interval accident analysis interval that is of the equilibrium length of this algorithm;
May further comprise the steps of described step 7:
Step 71: the zero-sequence current to each bar branch road carries out process analysis procedure analysis, promptly the fault that belongs to single-phase earthing is carried out process analysis procedure analysis;
Step 72: judge whether the zero-sequence current data are effective to route selection,, judge whether the zero-sequence current data are effective to route selection promptly according to precalculated reference value;
If invalid, then get into step 721;
Step 721: reject invalid branch road, do not participate in failure line selection;
If effectively, then get into step 73;
Step 73: stable state route selection;
Step 74; The transient state route selection.
2. the medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process according to claim 1, it is characterized in that: the line selection algorithm in the described step 7 comprises that stable state harmonic wave method, stable state are than width of cloth phase comparing method, transient state wavelet character method.
3. the medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process according to claim 2, it is characterized in that: described stable state harmonic wave method is 1,3,5,7 power frequency multiple harmonic wave methods.
4. the medium voltage distribution network fault line selection method for single-phase-to-ground fault of analyzing based on failure process according to claim 2, it is characterized in that: described transient state wavelet character method comprises energy method and polarity method.
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