CN109870631A - A kind of distribution line nature of trouble confirmation method based on voltage relationship comparison - Google Patents
A kind of distribution line nature of trouble confirmation method based on voltage relationship comparison Download PDFInfo
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Abstract
The present invention relates to a kind of distribution line nature of trouble confirmation methods based on voltage relationship comparison, belong to electric power network field.This method are as follows: fault phase is judged according to the phase, amplitude and voltage relationship of power supply side and load side and judges the Grounding of power supply side and load side.Conventional method acquires electric current, and electric current is smaller when failure, cannot accurately act, according to amplifier, in minor changes such as loads, then be easy will cause to be mistaken for failure.The present invention is changed greatly using voltage-phase when all kinds of failures and amplitude, and source side differs greatly with load side, conducive to being compared to each other, carries out discriminating fault types by voltage characteristic.
Description
Technical field
The invention belongs to electric power network fields, are related to a kind of distribution line nature of trouble confirmation based on voltage relationship comparison
Method.
Background technique
Due to 10kV distribution network overhead line builds height, it is easy to be caused circuit breaking, Huo Zheqi by external force destruction
Conduction causes people and animals to get an electric shock to his foreign object overlap joint on the line.
Due to the continuous development of the communication technology, terminal data acquisition and the mature application of interaction analysis application technology can lead to
Route two ends voltage-phase and magnitude relation comparative analysis line fault type are crossed, provides technical support for troubleshooting.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of distribution line nature of trouble based on voltage relationship comparison is true
Verifying method.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of distribution line nature of trouble confirmation method based on voltage relationship comparison, this method are as follows: according to source side and
Phase, amplitude and the voltage relationship of load side judge fault phase and judge the Grounding of power supply side and load side.
Further, the method specifically:
Assuming that A phase fault:
(1) when two sides broken string is earth-free, source side voltage-phase and amplitude are constant, load side broken string phase voltage becomes smaller and phase
Position and reverse phase before failure judge that broken string phase to phase fault occurs for route；
(2) source side is grounded after breaking, and when load side is earth-free, source side voltage failure mutually becomes 0, remaining two-phase voltage
Amplitude is 1.732 times of initial value, and 30 degree of phase offset, residual voltage and original A phase voltage opposite in phase, amplitude is identical, and load side is broken
Line phase voltage becomes smaller and reverse phase before phase and failure, is judged as broken string source side ground connection, and load side is earth-free；
(3) source side is earth-free after breaking, when load side is grounded: the offset of source side voltage-phase, amplitude increase, deviation angle
Degree and amplitude increasing degree and the impedance of load side transformer winding have relationship, and load side faulted phase voltage is 0；
(4) two sides broken string ground connection or do not break single-phase earthing when: source side and load side faulted phase voltage are 0, remaining phase
Voltage-phase deviates 30 degree, and amplitude is 1.732 times of open width value.
Further, the method specifically:
Assuming that C phase fault:
(1) C phase breaks, and source side is earth-free, load side ground connection
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and three-phase voltage is balanced three-phase voltage, phase and
Magnitude relation is as follows:
Without negative phase-sequence and zero-sequence component, in which:For A phase voltage,For B phase voltage,For C phase
Voltage, U are voltage standard amplitude, nothing；
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method,
Phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Wherein:For A phase voltage,For B phase voltage,For C phase voltage, U is voltage standard amplitude,For C phase
Residual voltage when failure,Positive sequence voltage when for C phase fault,Negative sequence voltage when for C phase fault；
Judge that C phase breaks by comparing source side and load side voltage relationship, source side is earth-free, load side ground connection；
(2) C phase breaks, and source side is earth-free, and load side is earth-free
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and three-phase voltage is balanced three-phase voltage, phase and
Magnitude relation is as follows:
Without negative phase-sequence and zero-sequence component；
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method,
Phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Judge that C phase breaks by comparing source side and load side voltage relationship, source side and load side are earth-free；
(3) C phase breaks, source side ground connection, and load side is earth-free
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and because source side ground connection C phase is zero, three-phase voltage is
Unbalanced voltages are decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method, and phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method,
Phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Judge that C phase breaks by comparing source side and load side voltage relationship, source side and load side are earth-free；
(4) C phase breaks, source side ground connection, load side ground connection
Source side is identical as load side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and because ground connection C phase is zero, three-phase voltage is asymmetry
Three-phase voltage is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method, and phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
C phase source and load side ground connection are judged by comparing source side and load side voltage relationship.
Electric current is acquired the beneficial effects of the present invention are: conventional method, electric current is smaller when failure, it cannot accurately act,
According to amplifier, in minor changes such as loads, then it is easy will cause to be mistaken for failure.The electricity when present invention utilizes all kinds of failures
Pressure phase and amplitude change greatly, and source side differs greatly with load side, conducive to being compared to each other, is differentiated by voltage characteristic
Fault type.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is phase relation when A phase fault two sides broken string is earth-free；
Fig. 2 is source side ground connection after A phase fault broken string, the earth-free phase relation of load side；
Fig. 3 is that source side is earth-free after A phase fault breaks, and load side is grounded phase relation；
Fig. 4 is A phase fault two sides broken string ground connection or the single-phase earthing phase relation that do not break；
Fig. 5 is C phase fault schematic diagram；
Fig. 6 is that C phase breaks, and source side is earth-free, the lateral spirogram of load side earthing power supply；
Fig. 7 is that C phase breaks, and source side is earth-free, and load side is grounded load side vectogram；
Fig. 8 is that C phase breaks, and source side is earth-free, the lateral spirogram of load side insulated supply system；
Fig. 9 is that C phase breaks, and source side is earth-free, the earth-free load side vectogram of load side；
Figure 10 is that C phase breaks, source side ground connection, the lateral spirogram of load side insulated supply system；
Figure 11 is that C phase breaks, source side ground connection, the earth-free load side vectogram of load side；
Figure 12 is that C phase breaks, source side ground connection, load side earthing power supply side and load side vectogram.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
For when A phase fault:
(1) when two sides broken string is earth-free: source side voltage-phase and amplitude are constant, and load side broken string phase voltage becomes smaller and phase
Position and reverse phase before failure can determine whether that broken string phase to phase fault occurs for route, and phase relation is shown in Fig. 1.
(2) source side is grounded after breaking, and load side is earth-free: source side voltage failure mutually becomes 0, remaining two-phase voltage width
Value is 1.732 times of initial value, and 30 degree of phase offset, residual voltage and original A phase voltage opposite in phase, amplitude is identical, such as Fig. 2 Ua ',
Ub ', U0, load side broken string phase voltage becomes smaller and reverse phase before phase and failure, can determine whether to be grounded for broken string source side, load side is not
Ground connection, phase relation are shown in Fig. 2.
(3) source side is earth-free after breaking, load side ground connection: the offset of source side voltage-phase, amplitude increase, deviation angle
And amplitude increasing degree and the impedance of load side transformer winding have relationship, load side faulted phase voltage is 0；Phase relation is shown in Fig. 3.
(4) two sides broken string ground connection or the single-phase earthing that do not break: source side is 0 with load side faulted phase voltage, remaining phase electricity
30 degree of phase offset of pressure, amplitude are 1.732 times of open width value, and phase relation is shown in Fig. 4.
By taking C phase fault as an example, C phase breaks in route as shown in Figure 5:
1, C phase breaks, and source side is earth-free, load side ground connection
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and three-phase voltage is balanced three-phase voltage, phase and
Magnitude relation is as follows:
Without negative phase-sequence and zero-sequence component, in which:For A phase voltage,For B phase voltage,For C phase
Voltage, U are voltage standard amplitude, nothing.Vectogram is as shown in Figure 6.
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method,
Phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Wherein:For A phase voltage,For B phase voltage,For C phase voltage, U is voltage standard amplitude,For C phase
Residual voltage when failure,Positive sequence voltage when for C phase fault,Negative sequence voltage when for C phase fault.Vectogram after decomposition
As shown in Figure 7.
It can judge that C phase breaks by comparing source side and load side voltage relationship, source side is earth-free, and load flanks
Ground.
2, C phase breaks, and source side is earth-free, and load side is earth-free
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and three-phase voltage is balanced three-phase voltage, phase and
Magnitude relation is as follows:
Without negative phase-sequence and zero-sequence component.Vectogram is as shown in Figure 8.
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method,
Phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Vectogram after decomposition is as shown in Figure 9.
It can judge that C phase breaks by comparing source side and load side voltage relationship, source side and load side are earth-free.
3, C phase breaks, source side ground connection, and load side is earth-free
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and because source side ground connection C phase is zero, three-phase voltage is
Unbalanced voltages are decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method, and phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Vectogram after decomposition is as shown in Figure 10.
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method,
Phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Vectogram after decomposition is as shown in figure 11.
It can judge that C phase breaks by comparing source side and load side voltage relationship, source side and load side are earth-free.
4, C phase breaks, source side ground connection, load side ground connection
Source side is identical as load side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and because ground connection C phase is zero, three-phase voltage is asymmetry
Three-phase voltage is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method, and phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Vectogram after decomposition is as shown in figure 12.
C phase source and load side ground connection can be judged by comparing source side and load side voltage relationship.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (3)
1. a kind of distribution line nature of trouble confirmation method based on voltage relationship comparison, it is characterised in that:
This method are as follows: fault phase is judged according to the phase, amplitude and voltage relationship of power supply side and load side and judges power supply
The Grounding of side and load side.
2. a kind of distribution line nature of trouble confirmation method based on voltage relationship comparison according to claim 1, special
Sign is: the method specifically:
Assuming that A phase fault:
(1) when two sides broken string is earth-free, source side voltage-phase and amplitude is constant, load side broken string phase voltage becomes smaller and phase with
Reverse phase before failure judges that broken string phase to phase fault occurs for route；
(2) source side is grounded after breaking, and when load side is earth-free, source side voltage failure mutually becomes 0, remaining two-phase voltage amplitude
It is 1.732 times of initial value, 30 degree of phase offset, residual voltage and original A phase voltage opposite in phase, amplitude is identical, load side broken string phase
Voltage becomes smaller and reverse phase before phase and failure, is judged as broken string source side ground connection, and load side is earth-free；
(3) break after source side it is earth-free, load side be grounded when: source side voltage-phase offset, amplitude increase, deviation angle and
Amplitude increasing degree and the impedance of load side transformer winding have relationship, and load side faulted phase voltage is 0；
(4) two sides broken string ground connection or do not break single-phase earthing when: source side and load side faulted phase voltage are 0, remaining phase voltage
30 degree of phase offset, amplitude is 1.732 times of open width value.
3. a kind of distribution line nature of trouble confirmation method based on voltage relationship comparison according to claim 1, special
Sign is: the method specifically:
Assuming that C phase fault:
(1) C phase breaks, and source side is earth-free, load side ground connection
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, three-phase voltage are balanced three-phase voltage, phase and amplitude
Relationship is as follows:
Without negative phase-sequence and zero-sequence component, in which:For A phase voltage,For B phase voltage,For C phase voltage,
U is voltage standard amplitude, nothing；
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component, phase with symmetrical component method
And magnitude relation is as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Wherein:For A phase voltage,For B phase voltage,For C phase voltage, U is voltage standard amplitude,For C phase fault
When residual voltage,Positive sequence voltage when for C phase fault,Negative sequence voltage when for C phase fault；
Judge that C phase breaks by comparing source side and load side voltage relationship, source side is earth-free, load side ground connection；
(2) C phase breaks, and source side is earth-free, and load side is earth-free
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, three-phase voltage are balanced three-phase voltage, phase and amplitude
Relationship is as follows:
Without negative phase-sequence and zero-sequence component；
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component, phase with symmetrical component method
And magnitude relation is as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Judge that C phase breaks by comparing source side and load side voltage relationship, source side and load side are earth-free；
(3) C phase breaks, source side ground connection, and load side is earth-free
Source side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and because source side ground connection C phase is zero, three-phase voltage is not right
Claim three-phase voltage, be decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method, phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Load side:
Load side causes asymmetrical three-phase because C phase breaks, and is decomposed into positive sequence, negative phase-sequence, zero-sequence component, phase with symmetrical component method
And magnitude relation is as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
Judge that C phase breaks by comparing source side and load side voltage relationship, source side and load side are earth-free；
(4) C phase breaks, source side ground connection, load side ground connection
Source side is identical as load side:
Source side voltage acquisition terminal acquires source side phase and amplitude, and because ground connection C phase is zero, three-phase voltage is asymmetric three-phase
Voltage is decomposed into positive sequence, negative phase-sequence, zero-sequence component with symmetrical component method, and phase and magnitude relation are as follows:
Phase voltage phase relation:
Zero-sequence component:
Positive-sequence component:
Negative sequence component:
C phase source and load side ground connection are judged by comparing source side and load side voltage relationship.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113203915A (en) * | 2021-04-16 | 2021-08-03 | 国网宁夏电力有限公司电力科学研究院 | Multi-source information fusion power distribution network single-phase line fault analysis method |
| CN113484661A (en) * | 2021-05-26 | 2021-10-08 | 贵州电网有限责任公司 | 10kV distribution line single-phase line break fault direction detection method and system based on line voltage change information |
| CN113484660A (en) * | 2021-05-26 | 2021-10-08 | 贵州电网有限责任公司 | 10kV distribution line single-phase line break and ground crash fault identification method and system based on bus zero sequence voltage information |
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Application publication date: 20190611 |