CN108008249A - Fault Locating Method based on power distribution network - Google Patents
Fault Locating Method based on power distribution network Download PDFInfo
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- CN108008249A CN108008249A CN201711215683.2A CN201711215683A CN108008249A CN 108008249 A CN108008249 A CN 108008249A CN 201711215683 A CN201711215683 A CN 201711215683A CN 108008249 A CN108008249 A CN 108008249A
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- fault
- current
- distribution network
- transient zero
- power distribution
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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
- G01R31/088—Aspects of digital computing
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- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses the Fault Locating Method based on power distribution network, using the electric current of current monitoring device dynamic monitoring power distribution network monitoring point, by compared with setting normal current reference value, judging whether fault overcurrent；When fault detector passes through wireless network and the communication unit communication of control centre of main website；Fault detector detects fault current and failure judgement sense of current, and then failure judgement circuit；Feeder terminal unit calculates failure and starts rear T0The amplitude I of interior transient zero-sequence currentf；Compare the transient zero-sequence current amplitude I of each test point on each bar routef, select transient zero-sequence current amplitude IfMaximum circuit；The situation of change of the transient zero-sequence current amplitude of each test point carries out small current grounding fault positioning on the circuit of selection.The circuit without line selection device for low current in station is overcome, the on-line monitoring of failure can be realized, timely find abort situation.
Description
Technical field
The present invention relates to power domain, and in particular to the Fault Locating Method based on power distribution network.
Background technology
Fault detector be short circuit and earth-fault indicator be for detect short circuit and earth fault equipment.In looped network
In distribution system, in particularly a large amount of systems using ring net load switch, if in next stage distribution network system there occurs
Short trouble or earth fault, the electric power system of upper level must carry out disjunction before the deadline, great to prevent
Accident.By using this product, the part broken down can be marked.Maintenance personal can be according to the alarm signal of this indicator
The section to break down is quickly found, fault section is opened in disjunction, so as to recover the power supply of fault-free section in time, can be saved a large amount of
Working time, reduce power off time and power failure range.
It can be seen from the above that the position of singlephase earth fault is found in time, and timely processing, to improving power supply reliability, ensureing
Controller switching equipment tool safe for operation is of great significance.
The content of the invention
When the technical problems to be solved by the invention are that low current singlephase earth fault occurs for system, fault current very little,
Fault-signal is faint, causes fault detect, route selection, positioning all highly difficult, and it is an object of the present invention to provide the fault location based on power distribution network
Method, solves the problems, such as that fault detect, route selection, positioning are all highly difficult.
The present invention is achieved through the following technical solutions：
Fault Locating Method based on power distribution network, comprises the following steps：
A, using the electric current of current monitoring device dynamic monitoring power distribution network monitoring point, by with setting normal current reference value
Compare, judge whether fault overcurrent；When there are during fault overcurrent, each independent comparators export alarming value 1, otherwise
Output valve 0；Limit value is got over by the fault overcurrent for controlling main website to collect all monitoring points, forms electric current warning message collection；
B, fault detector passes through wireless network and the communication unit communication of control centre of main website；Fault detector detects
Fault current and failure judgement sense of current, and then failure judgement circuit；
C, feeder terminal unit calculating failure starts rear T0The amplitude I of interior transient zero-sequence currentf；Compare each on each bar route
The transient zero-sequence current amplitude I of a test pointf, select transient zero-sequence current amplitude IfMaximum circuit；
D：According to the situation of change of the transient zero-sequence current amplitude of each test point on the circuit selected in the step C into
Row small current grounding fault positions.
Fault Locating Method based on power distribution network, the transient state zero of each test point on each bar circuit is calculated in the step C
Sequence current amplitude IfMethod be：
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.
Fault Locating Method based on power distribution network, the method divide distribution network to improve fault location speed
For active tree and passive branch, for the passive branch of non-faulty current, do not pay attention in positioning, shorten what is solved in algorithm
Dimension, so as to improve location efficiency.
Fault Locating Method based on power distribution network, the failure overcurrent reported first with feed terminal unit in the step A
Information primarily determines that fault section.
Compared with prior art, the present invention have the following advantages and advantages：
1st, the Fault Locating Method of the invention based on power distribution network, overcomes the circuit without line selection device for low current in station, energy
Realize the on-line monitoring of failure, timely find abort situation；
2nd, the Fault Locating Method of the invention based on power distribution network, the present invention is easy to operate, and detection is quick, is easy to use.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment, the present invention is made
Further to describe in detail, exemplary embodiment of the invention and its explanation are only used for explaining the present invention, are not intended as to this
The restriction of invention.
Embodiment 1
Fault Locating Method of the invention based on power distribution network, comprises the following steps：
A, using the electric current of current monitoring device dynamic monitoring power distribution network monitoring point, by with setting normal current reference value
Compare, judge whether fault overcurrent；When there are during fault overcurrent, each independent comparators export alarming value 1, otherwise
Output valve 0；Limit value is got over by the fault overcurrent for controlling main website to collect all monitoring points, forms electric current warning message collection；
B, fault detector passes through wireless network and the communication unit communication of control centre of main website；Fault detector detects
Fault current and failure judgement sense of current, and then failure judgement circuit；
C, feeder terminal unit calculating failure starts rear T0The amplitude I of interior transient zero-sequence currentf；Compare each on each bar route
The transient zero-sequence current amplitude I of a test pointf, select transient zero-sequence current amplitude IfMaximum circuit；
D：According to the situation of change of the transient zero-sequence current amplitude of each test point on the circuit selected in the step C into
Row small current grounding fault positions.
The transient zero-sequence current amplitude I of each test point on each bar circuit is calculated in the step CfMethod be：
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.
The method is divided into active tree and passive branch in order to improve fault location speed, by distribution network, for nothing
The passive branch of fault current, does not pay attention in positioning, shortens the dimension solved in algorithm, so as to improve location efficiency.Institute
State the failure reported first with feed terminal unit in step A and cross stream information and primarily determine that fault section.
Above-described embodiment, has carried out the purpose of the present invention, technical solution and beneficial effect further
Describe in detail, it should be understood that the foregoing is merely the embodiment of the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done, should all include
Within protection scope of the present invention.
Claims (4)
1. the Fault Locating Method based on power distribution network, it is characterised in that comprise the following steps：
A, using the electric current of current monitoring device dynamic monitoring power distribution network monitoring point, by compared with setting normal current reference value
Compared with judging whether fault overcurrent；When there are during fault overcurrent, each independent comparators export alarming value 1, otherwise export
Value 0；Limit value is got over by the fault overcurrent for controlling main website to collect all monitoring points, forms electric current warning message collection；
B, fault detector passes through wireless network and the communication unit communication of control centre of main website；Fault detector detects failure
Electric current and failure judgement sense of current, and then failure judgement circuit；
C, feeder terminal unit calculating failure starts rear T0The amplitude I of interior transient zero-sequence currentf；Compare each inspection on each bar route
The transient zero-sequence current amplitude I of measuring pointf, select transient zero-sequence current amplitude IfMaximum circuit；
D：Carried out according to the situation of change of the transient zero-sequence current amplitude of each test point on the circuit selected in the step C small
Current earthing fault location.
2. the Fault Locating Method according to claim 1 based on power distribution network, is characterized in that, calculated in the step C each
The transient zero-sequence current amplitude I of each test point on bar circuitfMethod be：
<mrow>
<msub>
<mi>I</mi>
<mi>f</mi>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<mfrac>
<mn>1</mn>
<msub>
<mi>T</mi>
<mn>0</mn>
</msub>
</mfrac>
<msubsup>
<mo>&Integral;</mo>
<mn>0</mn>
<msub>
<mi>T</mi>
<mn>0</mn>
</msub>
</msubsup>
<msup>
<msub>
<mi>i</mi>
<mn>0</mn>
</msub>
<mn>2</mn>
</msup>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
</msqrt>
</mrow>
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.
3. the Fault Locating Method according to claim 1 based on power distribution network, it is characterised in that the method is in order to improve
Fault location speed, is divided into active tree and passive branch by distribution network, for the passive branch of non-faulty current, is positioning
When do not pay attention to, shorten the dimension that solves in algorithm, so as to improve location efficiency.
4. the Fault Locating Method according to claim 1 based on power distribution network, it is characterised in that in the step A first
The failure reported with feed terminal unit crosses stream information and primarily determines that fault section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711215683.2A CN108008249A (en) | 2017-11-28 | 2017-11-28 | Fault Locating Method based on power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711215683.2A CN108008249A (en) | 2017-11-28 | 2017-11-28 | Fault Locating Method based on power distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108008249A true CN108008249A (en) | 2018-05-08 |
Family
ID=62054213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711215683.2A Withdrawn CN108008249A (en) | 2017-11-28 | 2017-11-28 | Fault Locating Method based on power distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108008249A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672979A (en) * | 2019-10-21 | 2020-01-10 | 广州航海学院 | Power distribution network line fault diagnosis system and method |
| CN112327097A (en) * | 2020-10-27 | 2021-02-05 | 南方电网科学研究院有限责任公司 | Power failure line positioning method |
-
2017
- 2017-11-28 CN CN201711215683.2A patent/CN108008249A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672979A (en) * | 2019-10-21 | 2020-01-10 | 广州航海学院 | Power distribution network line fault diagnosis system and method |
| CN110672979B (en) * | 2019-10-21 | 2021-12-07 | 广州航海学院 | Power distribution network line fault diagnosis system and method |
| CN112327097A (en) * | 2020-10-27 | 2021-02-05 | 南方电网科学研究院有限责任公司 | Power failure line positioning method |
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180508 |