CN103872666B - A kind of load based on voltage plane and single phase ground fault recognition methods - Google Patents
A kind of load based on voltage plane and single phase ground fault recognition methods Download PDFInfo
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- CN103872666B CN103872666B CN201410116623.5A CN201410116623A CN103872666B CN 103872666 B CN103872666 B CN 103872666B CN 201410116623 A CN201410116623 A CN 201410116623A CN 103872666 B CN103872666 B CN 103872666B
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- phase
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- protection installation
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000009434 installation Methods 0.000 claims abstract description 53
- 230000003111 delayed effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000452 restraining effect Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 150000001875 compounds Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The present invention relates to a kind of load based on voltage plane and single phase ground fault recognition methods, said method comprising the steps of: determine protection installation place phase bucking voltage
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
determine described protection installation place phase bucking voltage
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
movement locus; By more described protection installation place phase bucking voltage
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
the phase place of movement locus judge whether fault.The method can improve the performance of existing transmission line distance protecting when overload, has very important meaning to the safe and stable operation of electrical network and restriction accident expanded range.
Description
Technical field:
The present invention relates to a kind of fault recognition method, more specifically relate to a kind of load based on voltage plane and single phase ground fault recognition methods.
Background technology:
In extra high voltage network; the increase of its transmission capacity and the transfer of line fault afterload can cause transmission line overload; and transmission line overload can affect the performance of distance protection (especially distance protection III section); when load impedance be less than distance protection adjust impedance time; distance protection is by misoperation; cause accident expanded range, time serious, large-area power outage can be caused.
For the problem of distance protection possibility misoperation under overload; the measure taked at present mainly adjusts load restraining line to escape load on impedance plane; and this method can sacrifice the sensitivity of distance protection; along with load constantly increases; the active region of distance protection can significantly reduce; for single phase ground fault; because transition resistance excursion is larger; when transition resistance is larger; due to the impact of load restraining line; distance protection refused action, the tolerance transition resistance ability of distance protection is significantly weakened.
In addition, load restraining line needs dependence manually to adjust; Under Overload, if it is unreasonable to adjust, tuning error accident will be caused.
In sum, there is limitation due to impedance plane escaping load by load restraining line of adjusting, and thoroughly cannot solve distance protection misoperation problem when overload.
The feature (especially the feature of single phase ground fault and load) of current needs analysis of failure and load in new analysis plane; new load and single phase ground fault recognition methods are proposed; eliminate overload adjust the distance protection impact, this safe and stable operation for electrical network and restriction accident expanded range have very important meaning.
Summary of the invention:
The object of this invention is to provide a kind of load based on voltage plane and single phase ground fault recognition methods, the method improves the performance of existing transmission line distance protecting when overload.
For achieving the above object, the present invention is by the following technical solutions: a kind of load based on voltage plane and single phase ground fault recognition methods, said method comprising the steps of:
(1) protection installation place phase bucking voltage is determined
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
(2) described protection installation place phase bucking voltage is determined
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
movement locus;
(3) by more described protection installation place phase bucking voltage
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
the phase place of movement locus judge whether fault.
A kind of load based on voltage plane provided by the invention and single phase ground fault recognition methods, the protection installation place phase bucking voltage in described step (1)
for:
Wherein
for protecting the phase voltage of installation place,
for protecting the phase current of installation place, ρ between 0 ~ ∞, Z
setfor impedance of adjusting,
value be A, B, C.
A kind of load based on voltage plane provided by the invention and single phase ground fault recognition methods, the positive sequence compensation voltage that the protection installation place in described step (1) is benchmark with φ phase
for:
Wherein,
for protection installation place with
be the positive sequence voltage of benchmark mutually,
for protection installation place with
be the forward-order current of benchmark mutually.
Another preferably a kind of load based on voltage plane and single phase ground fault recognition methods provided by the invention, the single phase ground fault on the voltage plane in described step (3) is:
movement locus
phase place lag behind
movement locus
phase place.
Preferably a kind of load based on voltage plane and a single phase ground fault recognition methods more provided by the invention, the load on the voltage plane in described step (3) is judged as:
movement locus
with
movement locus
overlap.
Another preferably a kind of load based on voltage plane provided by the invention and single phase ground fault recognition methods, if
movement locus
phase place lag behind
movement locus
phase place, described single phase ground fault criterion is:
Wherein, p1, p2 are Protection criteria threshold value.
Another preferably a kind of load based on voltage plane provided by the invention and single phase ground fault recognition methods, described p1, p2 are:
When
time, p1=120 °,
γ value is relevant with separate;
When
time, p1=90 °, p2=270 °;
When
time, p1=120 °, p2=270 °;
When
time, p1=90 °, p2=240 °;
Wherein,
for power-factor angle, Q1 is protection installation place reactive power, and P1 is protection installation place average power.
Another preferably a kind of load based on voltage plane provided by the invention and single phase ground fault recognition methods, described γ value is:
Fault phase:
Leading phase:
Delayed phase:
Wherein, leading phase, delayed for fault phase; M is degree of asymmetry, and pu is to U
1cos (arctg
) ask perunit value with rated voltage as benchmark, U
1for protection installation place busbar voltage.
With immediate prior art ratio, the invention provides technical scheme and there is following excellent effect
1, the inventive method improves the performance of existing transmission line distance protecting when overload;
2, the inventive method can when overload, and distance protection is failure to actuate, and during the internal fault of line areas, distance protection action message, excises faulty line fast, improves the resistance to transition resistance ability of ground distance protection simultaneously;
3, in the present invention without the need to manually adjusting, avoid tuning error;
4, the present invention has very important meaning to the safe and stable operation of electrical network and restriction accident expanded range.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention;
Fig. 2 is Equivalent Network schematic diagram under normal circumstances in the present invention;
Fig. 3 is that in the present invention on voltage plane, load is corresponding
with
phase relation schematic diagram;
Compound sequence network schematic diagram when Fig. 4 is single phase ground fault in the present invention;
Equivalent system schematic when Fig. 5 is single phase ground fault in the present invention;
Fig. 6 is that in the present invention on voltage plane, single phase ground fault is corresponding
with
phase relation schematic diagram;
Fig. 7 is in the present invention on voltage plane, load and single phase ground fault identical criterion active region schematic diagram.
Embodiment
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in figs. 1-7, the invention of this example, based on the load of voltage plane and single phase ground fault recognition methods, said method comprising the steps of:
(1) protection installation place phase bucking voltage is determined
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
(2) described protection installation place phase bucking voltage is determined
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
movement locus;
(3) by more described protection installation place phase bucking voltage
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
the phase place of movement locus judge whether fault.
Protection installation place phase bucking voltage in described step (1)
for:
wherein
for protecting the phase voltage of installation place,
for protecting the phase current of installation place, ρ between 0 ~ ∞, Z
setfor impedance of adjusting,
value be A, B, C.
The positive sequence compensation voltage that protection installation place in described step (1) is benchmark with φ phase
for:
wherein,
for protection installation place with
be the positive sequence voltage of benchmark mutually,
for protection installation place with
be the forward-order current of benchmark mutually.
Single phase ground fault on voltage plane in described step (3) for: described in
movement locus
phase place lag behind the phase voltage of protection installation place before fault
movement locus
phase place or
movement locus
phase place lag behind
movement locus
phase;
Load on voltage plane in described step (3) is judged as:
movement locus
with
movement locus
overlap.
If
movement locus
phase place lag behind
movement locus
phase place, described single phase ground fault criterion is:
Wherein p1, p2 are Protection criteria threshold value.
Gather three-phase current and the three-phase voltage of protection installation place, change measure by filtering, Fourier and process, calculate:
and
calculate
Formula (1) is utilized to judge,
When
time, p1=120 °,
γ value is relevant with separate.Leading phase, delayed for fault phase.
Fault phase:
Leading phase:
Delayed phase:
When
time, p1=90 °, p2=270 °;
When
time, p1=120 °, p2=270 °;
When
time, p1=90 °, p2=240 °;
Wherein,
for power-factor angle, Q1 is protection installation place reactive power, and P1 is protection installation place average power, and m is degree of asymmetry, and pu is to U
1cos (arctg
) ask perunit value with rated voltage as benchmark, U
1for protection installation place busbar voltage.
If
be judged as single phase ground fault, if do not meet, be judged as load.
All definite values are realized, without the need to manually adjusting by protective device inside above
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of this right.
Claims (4)
1., based on load and the single phase ground fault recognition methods of voltage plane, it is characterized in that: said method comprising the steps of:
(1) protection installation place phase bucking voltage is determined
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
(2) described protection installation place phase bucking voltage is determined
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
movement locus;
(3) by more described protection installation place phase bucking voltage
the positive sequence compensation voltage that protection installation place is benchmark with φ phase
the phase place of movement locus judge whether fault;
Protection installation place phase bucking voltage in described step (1)
for:
Wherein
for protecting the phase voltage of installation place,
for protecting the phase current of installation place, ρ between 0 ~ ∞, Z
setfor impedance of adjusting,
value be A, B, C;
The positive sequence compensation voltage that protection installation place in described step (1) is benchmark with φ phase
for:
Wherein,
for protecting the positive sequence voltage being benchmark with φ phase of installation place,
for protection installation place with
be the forward-order current of benchmark mutually;
Single phase ground fault on voltage plane in described step (3) is:
movement locus
phase place lag behind
movement locus
phase place;
If
movement locus
phase place lag behind
movement locus
phase place, described single phase ground fault criterion is:
Wherein, p1, p2 are Protection criteria threshold value.
2. a kind of load based on voltage plane and single phase ground fault recognition methods as claimed in claim 1, is characterized in that: the load on the voltage plane in described step (3) is judged as:
movement locus
with
movement locus
overlap.
3. a kind of load based on voltage plane and single phase ground fault recognition methods as claimed in claim 1, is characterized in that: described p1, p2 are:
When
time, p1=120 °,
γ value is relevant with separate;
When
time, p1=90 °, p2=270 °;
When
time, p1=120 °, p2=270 °;
When
time, p1=90 °, p2=240 °;
Wherein,
for power-factor angle, Q1 is protection installation place reactive power, and P1 is protection installation place average power.
4. a kind of load based on voltage plane and single phase ground fault recognition methods as claimed in claim 3, is characterized in that: described γ value is:
Fault phase:
Leading phase:
Delayed phase:
Wherein, leading phase, delayed for fault phase; M is degree of asymmetry, and pu is to U
1cos
perunit value is asked as benchmark, U with rated voltage
1for protection installation place busbar voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410116623.5A CN103872666B (en) | 2014-03-26 | 2014-03-26 | A kind of load based on voltage plane and single phase ground fault recognition methods |
| PCT/CN2014/090288 WO2015143874A1 (en) | 2014-03-26 | 2014-11-05 | Voltage plane-based load and single-phase ground fault recognition method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410116623.5A CN103872666B (en) | 2014-03-26 | 2014-03-26 | A kind of load based on voltage plane and single phase ground fault recognition methods |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103872666A CN103872666A (en) | 2014-06-18 |
| CN103872666B true CN103872666B (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410116623.5A Active CN103872666B (en) | 2014-03-26 | 2014-03-26 | A kind of load based on voltage plane and single phase ground fault recognition methods |
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| CN (1) | CN103872666B (en) |
| WO (1) | WO2015143874A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872666B (en) * | 2014-03-26 | 2016-02-24 | 国家电网公司 | A kind of load based on voltage plane and single phase ground fault recognition methods |
| CN104332965B (en) * | 2014-10-15 | 2017-09-01 | 国家电网公司 | A kind of method for determining the high limit coefficient of singlephase earth fault identification |
| JP6962926B2 (en) * | 2015-11-04 | 2021-11-05 | ズークス インコーポレイテッド | Remote control systems and methods for trajectory correction of autonomous vehicles |
| CN111487505B (en) * | 2020-05-13 | 2021-11-19 | 国网山东省电力公司泰安供电公司 | Distribution line single-phase earth fault demarcation method, system, terminal and storage medium |
| CN113970686B (en) * | 2021-10-27 | 2022-08-30 | 西南交通大学 | Power distribution network fault detection method and system based on single-ended quantity protection and positioning method |
| CN113970685B (en) * | 2021-10-27 | 2022-08-30 | 西南交通大学 | Power distribution network fault detection method and system based on differential analysis and positioning method |
| CN114034985B (en) * | 2021-11-18 | 2023-09-19 | 国网重庆市电力公司电力科学研究院 | Distribution network asymmetric fault on-site positioning method based on distributed power supply information |
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| CN101227085A (en) * | 2008-01-02 | 2008-07-23 | 朱声石 | Method for ensuring distance to protect backup segment without excess load influence |
| CN102904226A (en) * | 2012-10-08 | 2013-01-30 | 华南理工大学 | Self-adaptive distance protection method for distribution network with distributed power supply |
| CN103199509A (en) * | 2013-03-13 | 2013-07-10 | 福建省电力有限公司 | Electric transmission line failure relay protection method based on double-end positive sequence fundamental components |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE526446C2 (en) * | 2003-03-05 | 2005-09-13 | Jan Berggren | Detection of earth faults in three-phase system |
| CN103872666B (en) * | 2014-03-26 | 2016-02-24 | 国家电网公司 | A kind of load based on voltage plane and single phase ground fault recognition methods |
-
2014
- 2014-03-26 CN CN201410116623.5A patent/CN103872666B/en active Active
- 2014-11-05 WO PCT/CN2014/090288 patent/WO2015143874A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227085A (en) * | 2008-01-02 | 2008-07-23 | 朱声石 | Method for ensuring distance to protect backup segment without excess load influence |
| CN102904226A (en) * | 2012-10-08 | 2013-01-30 | 华南理工大学 | Self-adaptive distance protection method for distribution network with distributed power supply |
| CN103199509A (en) * | 2013-03-13 | 2013-07-10 | 福建省电力有限公司 | Electric transmission line failure relay protection method based on double-end positive sequence fundamental components |
Non-Patent Citations (2)
| Title |
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| 多相补偿阻抗元件的研究与仿真分析;穆大庆等;《电力科学与技术学报》;20071231;第22卷(第4期);26-30,35 * |
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| Publication number | Publication date |
|---|---|
| WO2015143874A1 (en) | 2015-10-01 |
| CN103872666A (en) | 2014-06-18 |
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