CN107153149B - Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic - Google Patents
Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic Download PDFInfo
- Publication number
- CN107153149B CN107153149B CN201710331464.4A CN201710331464A CN107153149B CN 107153149 B CN107153149 B CN 107153149B CN 201710331464 A CN201710331464 A CN 201710331464A CN 107153149 B CN107153149 B CN 107153149B
- Authority
- CN
- China
- Prior art keywords
- negative
- sequence
- current
- phase
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- G01R31/08—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
-
- 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
- G01R31/088—Aspects of digital computing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention discloses a kind of power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic, comprising: step 1: in the three-phase voltage of substation's acquisition bus and the three-phase current of each route；Step 2: extracting bus negative sequence voltage and each route negative-sequence current；Step 3: seeking the derivative of each outlet negative-sequence current；Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence current；Step 5: the related coefficient of more each route, if related coefficient is greater than 0, for sound circuit；If related coefficient is less than 0, for faulty line.The present invention is based on the power distribution network single-phase disconnection recognition methods of negative sequence voltage and negative-sequence current derivative correlation method to have bootstrapping property, is not influenced by neutral grounding in distribution power network, can be with all kinds of disconnection faults of reliable recognition.
Description
Technical field
The present invention relates to power distribution network relay protection field, in particular to a kind of identification side of power distribution network single-phase disconnection failure
Method.
Background technique
With the propulsion of distribution network construction, insulating frame ceases to be busy is using increasing.With the raising of line insulation rate, thunder
There are also the other reasons such as construction for the reason of it is more and more to hit disconnection fault, while causing disconnection fault.Power distribution network occurs single-phase disconnected
The normal operation of power distribution network is not influenced after line, so being often difficult to find this kind of failure.But if disconnection fault cannot be timely
Processed, it will cause the accidents such as the electric shock of people and animals around, and it is therefore necessary to study power distribution network broken string identification technology.
Summary of the invention
The purpose of the present invention is to provide a kind of power distribution network single-phase disconnection fault identifications based on negative sequence voltage current characteristic
Method, to solve the above technical problems.
To achieve the goals above, the present invention adopts the following technical scheme:
Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic, comprising the following steps:
Step 1: in the three-phase voltage of substation's acquisition bus and the three-phase current of each route；
Step 2: extracting bus negative sequence voltage and each route negative-sequence current；
Step 3: seeking the derivative of each outlet negative-sequence current；
Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence current；
Step 5: the related coefficient of more each route, if related coefficient is greater than 0, for sound circuit；If related
Coefficient is then faulty line less than 0.
Further, bus negative sequence voltage and each route negative-sequence current are extracted by formula (3) in step 2:
Wherein u0(k)、i0(k) it is the sample amplitude when reproduced and electric current of residual voltage and zero-sequence current, passes through three-phase voltage and three
Phase current synthesizes to obtain, and N is the sampling number of every frequency cycle.
Further, step 3 seeks the derivative of each outlet negative-sequence current by formula (4):
Further, step 4 seeks the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence current by formula (5):
Compared with the existing technology, the invention has the following advantages: the present invention initially set up power distribution network occur it is single-phase
Model after disconnection fault, negative sequence voltage and the electric current for being then based on Analysis of Failure Model sound circuit and faulty line are special
Sign, and propose the recognition methods of faulty line.The present invention is based on the power distribution networks of negative sequence voltage and negative-sequence current derivative correlation method
Single-phase wire break recognition methods has bootstrapping property, is not influenced by neutral grounding in distribution power network, can be with all kinds of broken strings of reliable recognition
Failure.
Detailed description of the invention
Fig. 1 is that the negative phase-sequence equivalent network schematic diagram after single-phase wire break occurs for power distribution network；
Fig. 2 is 10kV power distribution network simulation model schematic diagram；
Fig. 3 is that negative sequence voltage and negative-sequence current derivative related coefficient after single-phase wire break failure occur for isolated neutral system；
Fig. 4 be arc suppression coil earthing system occur single-phase wire break failure after negative sequence voltage and negative-sequence current derivative phase relation
Number.
Specific embodiment
Present invention seek to address that single-phase wire break fault identification problem occurs for power distribution network.After pointing out that single-phase wire break occurs for power distribution network
Negative phase-sequence equivalent network as shown in Figure 1, wherein ZinIndicate the equivalent negative phase-sequence of i-th outlet route, load transformer and load
Reactance, iinIndicate the negative-sequence current of i-th outlet, Zmdn、imdnIndicate the equivalent negative sequence neactance and negative phase-sequence electricity in faulty line downstream
Stream, Zmun、imunIndicate the equivalent negative sequence neactance and negative-sequence current of faulty line upstream, ZGn、iGnIndicate the equivalent negative of system power supply
Sequence reactance and negative-sequence current, ZLn、iLnIndicate the equivalent negative sequence neactance and negative-sequence current of arc suppression coil, inIndicate that incision position injects net
The equivalent negative phase-sequence current source of network.
As can be seen from Figure 1 bus is flowed to by route for faulty line negative-sequence current, for sound circuit be by
Bus flows to route because by route, load transformer and load it is equivalent at a negative sequence neactance, for perfecting line
Road meets:
Faulty line is met:
It is positively correlated from formula (1), (2) it can be seen that meeting for the derivative of sound circuit negative sequence voltage and negative-sequence current, therefore
The derivative of the negative sequence voltage and negative-sequence current that hinder route meets negatively correlated.The differentiation of faulty line can be realized accordingly, specifically
Step are as follows:
Step 1: in the three-phase voltage (u of substation's acquisition busa(k), ub(k), ucAnd the three-phase current of each route (k))
(ia(k), ib(k), ic(k))；
Step 2: by formula (3), extracting bus negative sequence voltage un(k) and each route negative-sequence current in(k)；
Wherein u0(k)、i0(k) it is the sample amplitude when reproduced and electric current of residual voltage and zero-sequence current, passes through three-phase voltage (ua
(k), ub(k), ucAnd three-phase current (i (k))a(k), ib(k), ic(k)) synthesis obtains, and N is the sampling number of every frequency cycle.
Step 3: the derivative of each outlet negative-sequence current is sought by formula (4)；
Wherein, Δ T is sampling step length；
Step 4: the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence current is sought by formula (5)；
Step 5: the related coefficient of more each route, if related coefficient is greater than 0, for sound circuit；If related
Coefficient is then faulty line less than 0.
Simulating, verifying:
Fig. 2 is the 10kV power distribution network simulation model schematic diagram established based on PSCAD；In the model, 35kV substation has two
It is single busbar form by the 10kV system that two main transformers are allotted back into line；Bus has 4 main feeders, each in outlet
The number of section is as shown in the figure.Wherein, section 1,3,5,10 is cable, and section 2,9,11,12,13 is aerial insulated wire, area
Section 4,6,7,8,14 is overhead bare conductor.Arc suppression coil is on change neutral point used.When switch K is opened, system is neutral point
Isolated neutral system；Switch K closure is then arc suppression coil earthing system, and overcompensation degree is taken as 10%.
Each section length is respectively as follows: L1=5.1km, L2=4km, L3=3.8km, L4=7.5km, L5=4km, L6=
10km, L7=0.1km, L8=3km, L9=4km, L10=3.2km, L11=10km, L12=5km, L13=3km, L14=7.5km.
Cable data are as follows: positive sequence resistance r1=0.157 Ω/km, positive sequence induction reactance x1=0.076 Ω/km, positive sequence accommodate b1=
132×10-6S/km；Zero sequence resistance r0=0.307 Ω/km, zero sequence induction reactance x0=0.304 Ω/km, zero sequence accommodate b0=110 ×
10-6S/km。
Aerial insulated wire parameter are as follows: r1=0.27 Ω/km, positive sequence induction reactance x1=0.352 Ω/km, positive sequence accommodate b1=
3.178×10-6S/km；Zero sequence resistance r0=0.42 Ω/km, zero sequence induction reactance x0=3.618 Ω/km, zero sequence accommodate b0=0.676
×10-6S/km。
Bare conductor parameter in section 7,8 are as follows: positive sequence resistance r1=0.91 Ω/km, positive sequence induction reactance x1=0.403 Ω/km, just
Sequence accommodates b1=2.729 × 10-6S/km；Zero sequence resistance r0=1.06 Ω/km, zero sequence induction reactance x0=3.618 Ω/km, zero sequence accommodate
b0=0.672 × 10-6S/km。
Other section bare conductor parameters are as follows: positive sequence resistance r1=0.63 Ω/km, positive sequence induction reactance x1=0.392 Ω/km, positive sequence
Accommodate b1=2.807 × 10-6S/km；Zero sequence resistance r0=0.78 Ω/km, zero sequence induction reactance x0=3.593 Ω/km, zero sequence accommodate b0
=0.683 × 10-6S/km。
Two main transformer parameters are respectively as follows: capacity SN=2MVA, short circuit loss Pk=20.586kW, short-circuit voltage percentage
Uk%=6.37%, no-load loss P0=2.88kW, no-load current percentage I0%=0.61%；Capacity SN=2MVA, short circuit damage
Consume Pk=20.591kW, short-circuit voltage percentage Uk%=6.35%, no-load loss P0=2.83kW, no-load current percentage
I0%=0.62%.
Each distribution transformer and institute's jointing is enabled to number consistent, then their capacity is respectively as follows: S5N=50kVA, S7N=
500kVA, S8N=200kVA, S9N=1MVA, S10N=100kVA, S12N=1MVA, S13N=400kVA, S14N=630kVA.For
For the sake of simplicity, each distribution transformer institute on-load is unified for the 80% of transformer capacity, power factor 0.85.
Fig. 3 is that the waveform that single-phase wire break phase to phase fault emulates is arranged in the end of isolated neutral system section 1.It can be with
Find out, the related coefficient of route 1 is negative value, other routes are positive, it is possible to which determination is that disconnection fault has occurred in route 1.
Fig. 4 flanks earth fault in the head end setting single-phase wire break application of load of section 4 for arc suppression coil earthing system and emulates
The waveform arrived.As can be seen that the related coefficient of route 4 is negative value, other routes are positive, it is possible to which true timing circuit 4 occurs
Disconnection fault.
To sum up analysis based on the power distribution network single-phase disconnection of negative sequence voltage and negative-sequence current derivative correlation method it can be seen that identified
Method has bootstrapping property, is not influenced by neutral grounding in distribution power network, can be with all kinds of disconnection faults of reliable recognition.
Claims (2)
1. the power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic, which is characterized in that including following step
It is rapid:
Step 1: in the three-phase voltage of substation's acquisition bus and the three-phase current of each route；
Step 2: extracting bus negative sequence voltage and each route negative-sequence current；
Step 3: seeking the derivative of each outlet negative-sequence current；
Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence current；
Step 5: the related coefficient of more each route, if related coefficient is greater than 0, for sound circuit；If related coefficient
It is then faulty line less than 0；
Bus negative sequence voltage and each route negative-sequence current are extracted by formula (3) in step 2:
Wherein u0(k)、i0(k) it is the sample amplitude when reproduced and electric current of residual voltage and zero-sequence current, passes through three-phase voltage and three-phase electricity
Stream synthesis obtains, and N is the sampling number of every frequency cycle；
Step 4 seeks the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence current by formula (5):
2. the power distribution network single-phase disconnection fault recognition method according to claim 1 based on negative sequence voltage current characteristic,
It is characterized in that, step 3 seeks the derivative of each outlet negative-sequence current by formula (4):
Δ T is sampling step length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710331464.4A CN107153149B (en) | 2017-05-11 | 2017-05-11 | Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710331464.4A CN107153149B (en) | 2017-05-11 | 2017-05-11 | Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107153149A CN107153149A (en) | 2017-09-12 |
| CN107153149B true CN107153149B (en) | 2019-06-11 |
Family
ID=59793931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710331464.4A Active CN107153149B (en) | 2017-05-11 | 2017-05-11 | Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107153149B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054739B (en) * | 2017-12-18 | 2019-05-28 | 广东电网有限责任公司珠海供电局 | A kind of overhead transmission line feeder automation method and system based on negative-sequence current |
| CN109375030A (en) * | 2018-09-06 | 2019-02-22 | 深圳供电局有限公司 | The recognition methods of high voltage overhead lines disconnection fault and device |
| CN109596945B (en) * | 2019-01-18 | 2020-09-25 | 广东电网有限责任公司 | Novel power distribution network fault line selection method based on correlation coefficient vector similarity degree |
| CN110187220B (en) * | 2019-05-23 | 2021-09-07 | 昆明理工大学 | MMC direct current transmission line fault identification method based on correlation |
| CN111337855B (en) * | 2020-03-18 | 2022-06-21 | 贵州电网有限责任公司 | Active power distribution network disconnection fault protection method based on negative sequence current ratio |
| CN111323733B (en) * | 2020-03-23 | 2021-12-07 | 贵州电网有限责任公司 | Single-phase disconnection monitoring method based on negative sequence voltage at distributed power supply terminal |
| CN113422356B (en) * | 2021-07-08 | 2022-07-22 | 国网河北省电力有限公司电力科学研究院 | Active power distribution network disconnection fault protection method and device and power distribution terminal |
| CN113848429B (en) * | 2021-10-15 | 2023-07-18 | 国网陕西省电力公司电力科学研究院 | Single-phase disconnection fault protection method and system for power distribution network |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162838A (en) * | 2007-11-29 | 2008-04-16 | 昆明理工大学 | Low current neutral grounding system fault route selecting method by wavelet package decompose and correlation analysis |
| CN102419408A (en) * | 2011-12-31 | 2012-04-18 | 上海交通大学 | System and method for determining single-phase disconnection fault sections based on load monitors |
| CN102866326A (en) * | 2012-09-06 | 2013-01-09 | 国家电网公司 | Distribution network fault line selection method based on zero sequence current variable quantity waveform correlation coefficient matrix |
| CN103197203A (en) * | 2013-03-29 | 2013-07-10 | 昆明理工大学 | Fault line selection method based on time domain waveform correlation analysis of three-phase current breaking variable |
| CN103743998A (en) * | 2013-12-23 | 2014-04-23 | 华北电力大学（保定） | Cross correlation coefficient-based distribution network single-phase grounding fault positioning method and system |
| CN104181442A (en) * | 2014-08-21 | 2014-12-03 | 西安交通大学 | Power distribution network single-phase earth fault section locating method based on correlation analysis |
| KR101598536B1 (en) * | 2014-11-04 | 2016-02-29 | 한전케이디엔주식회사 | Feeder remote terminal unit |
| CN105842583A (en) * | 2016-03-25 | 2016-08-10 | 西安交通大学 | Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change |
| CN105954640A (en) * | 2016-05-03 | 2016-09-21 | 河南师范大学 | Power distribution network fault line selection method based on dominant frequency zero sequence power |
| CN106501668A (en) * | 2016-03-16 | 2017-03-15 | 济南大学 | A kind of conventional electrical distribution net single-phase wire break fault-line selecting method |
-
2017
- 2017-05-11 CN CN201710331464.4A patent/CN107153149B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162838A (en) * | 2007-11-29 | 2008-04-16 | 昆明理工大学 | Low current neutral grounding system fault route selecting method by wavelet package decompose and correlation analysis |
| CN102419408A (en) * | 2011-12-31 | 2012-04-18 | 上海交通大学 | System and method for determining single-phase disconnection fault sections based on load monitors |
| CN102866326A (en) * | 2012-09-06 | 2013-01-09 | 国家电网公司 | Distribution network fault line selection method based on zero sequence current variable quantity waveform correlation coefficient matrix |
| CN103197203A (en) * | 2013-03-29 | 2013-07-10 | 昆明理工大学 | Fault line selection method based on time domain waveform correlation analysis of three-phase current breaking variable |
| CN103743998A (en) * | 2013-12-23 | 2014-04-23 | 华北电力大学（保定） | Cross correlation coefficient-based distribution network single-phase grounding fault positioning method and system |
| CN104181442A (en) * | 2014-08-21 | 2014-12-03 | 西安交通大学 | Power distribution network single-phase earth fault section locating method based on correlation analysis |
| KR101598536B1 (en) * | 2014-11-04 | 2016-02-29 | 한전케이디엔주식회사 | Feeder remote terminal unit |
| CN106501668A (en) * | 2016-03-16 | 2017-03-15 | 济南大学 | A kind of conventional electrical distribution net single-phase wire break fault-line selecting method |
| CN105842583A (en) * | 2016-03-25 | 2016-08-10 | 西安交通大学 | Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change |
| CN105954640A (en) * | 2016-05-03 | 2016-09-21 | 河南师范大学 | Power distribution network fault line selection method based on dominant frequency zero sequence power |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107153149A (en) | 2017-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107153149B (en) | Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic | |
| CN109669103B (en) | Real type power distribution network multi-state complex fault simulation test platform and test method | |
| CN105842583B (en) | Distribution single-phase earthing Section Location based on faulted phase voltage and jump-value of current | |
| CN105119255B (en) | Photovoltaic microgrid fault isolation method based on fault state | |
| CN107192922B (en) | Resonant earthed system Earth design method based on phase current phase bit comparison | |
| CN102073795B (en) | 110kV cable hybrid line switching overvoltage level prediction method | |
| CN109494696B (en) | Power distribution network asymmetric fault positioning and isolating method and system based on adaptive reclosing | |
| CN107219442B (en) | Resonant earthed system Earth design method based on phase voltage current phase | |
| CN104360227B (en) | Substation cable outlet fault monitoring method based on traveling wave method and transient basic frequency method | |
| CN106199330B (en) | A kind of marine wind electric field collection line fault positioning system and method | |
| CN106997016B (en) | A kind of low-voltage distributing line disconnection fault recognition methods and device | |
| CN107015113A (en) | The power distribution network broken string recognition methods compared is mutated based on forward-order current | |
| CN107015114A (en) | The broken string recognition methods compared based on non-faulting phase current correlation | |
| CN207541193U (en) | A kind of polymorphic complex fault analogue test platform of power distribution network | |
| CN104360226B (en) | Method for monitoring fault of cable outgoing lines of transformer substation on basis of current initial traveling wave polarity | |
| CN104375056B (en) | Substation cable outgoing line fault monitoring method based on voltage and current initial row waves | |
| CN106980067B (en) | The broken string recognition methods compared based on residual voltage differential values | |
| CN113848429B (en) | Single-phase disconnection fault protection method and system for power distribution network | |
| CN112540259A (en) | Distribution network disconnection fault identification method and system suitable for intelligent power distribution terminal | |
| CN109001592A (en) | A kind of resonant earthed system fault line selection method for single-phase-to-ground fault based on transient | |
| CN105445567B (en) | The nuclear-phase method of totally enclosed type generalized information system | |
| CN107255765B (en) | A kind of resonant earthed system singlephase earth fault Section Location | |
| CN112986743B (en) | Active intervention type arc suppression device test system function system | |
| CN106501674A (en) | Medium voltage distribution network single-phase earth fault positioning device and its Fault Locating Method | |
| CN201054500Y (en) | Direction ground arc-elimination and cable selection suite device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201231 Address after: Room D301, gazelle Valley, No.1, Zone C, venture R & D Park, 69 Jinye Road, high tech Zone, Xi'an City, Shaanxi Province, 710077 Patentee after: XI'AN XIRUI CONTROL TECHNOLOGY Co.,Ltd. Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University |