CN109470993A - A kind of single-phase wire break fault detection method suitable for power distribution network - Google Patents
A kind of single-phase wire break fault detection method suitable for power distribution network Download PDFInfo
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- CN109470993A CN109470993A CN201811319044.5A CN201811319044A CN109470993A CN 109470993 A CN109470993 A CN 109470993A CN 201811319044 A CN201811319044 A CN 201811319044A CN 109470993 A CN109470993 A CN 109470993A
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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
- G01R31/081—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
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Abstract
The invention discloses a kind of single-phase wire break fault detection method suitable for power distribution network, 1) three-phase voltage and three-phase current of measurement point are acquired in real time, and calculation processing is carried out, extract forward-order current, negative-sequence current, three-phase line voltage and residual voltage；2) single-phase wire break fault initiating condition distinguishing is carried out respectively to each measurement point based on aforementioned obtained data, enter step 3) if meeting entry condition；The return step 1 if being unsatisfactory for entry condition)；3) it carries out single-phase wire break fault actions condition distinguishing respectively to each measurement point, is entered step 4) if meeting operation condition；The return step 1 if being unsatisfactory for operation condition)；4) broken string is separate to be determined according to single-phase wire break failure separate decision condition respectively to each measurement point, the present invention realizes accurately identifying for single-phase wire break failure in the distribution network line of multiple-limb load, provides foundation to be further processed disconnection fault.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System fields, and in particular to a kind of single-phase wire break suitable for power distribution network
Fault detection method.
Background technique
China's distribution network system is often referred to the distribution network of 35kV and following voltage class, at present the distribution of most cities
Route is powered using 10kV voltage class.Distribution line distribution is wide, and total length is long, and branch is more, and running environment is multiple
Miscellaneous multiplicity, thus may be influenced by factors cause occur disconnection fault.With the development of electric system, for various short
Road failure has all gradually formed more sound protection theory and protective device, and especially actually answers the research of disconnection fault
With also seldom.
When single-phase wire break failure occurs for power distribution network, system voltage can occur significantly to change, and then influence the peace of system
Full stable operation, also influences whether the normal work of electrical equipment in system, while occurring after disconnection fault in most cases
Security risk directly can be constituted to people and animals around and even result in disaster along with the ground connection of faulty line.
In view of disconnection fault problem present in power distribution network, the route to break down and positioning event accurately and timely are identified
The position of barrier point becomes primary study object.The existing detection method about disconnection fault has the disadvantage that
The prior art does not consider distribution network system route length, the actual conditions of multiple-limb, is only sampled in outlet
Differentiate with broken string, for containing multiple branch loads and disconnection fault occurs from outlet remote position, generation
The variation of outlet voltage and current is not obvious when failure, and may cause can not be recognized accurately disconnection fault, even if identifying
Disconnection fault, it is also difficult to the position for judging fault point, long for route, multiple-limb distribution line, only identify therefore
Barrier route is much unable to satisfy practical application needs.
Summary of the invention
To solve the above problems, the present invention proposes a kind of single-phase wire break fault detection method suitable for power distribution network, realize
Single-phase wire break failure accurately identifies in the distribution network line of multiple-limb load, to be further processed disconnection fault provides foundation.
The present invention adopts the following technical scheme that a kind of single-phase wire break fault detection method suitable for power distribution network is specific to walk
It is rapid as follows:
1) three-phase voltage and three-phase current of acquisition measurement point in real time, and carries out calculation processing, extract forward-order current,
Negative-sequence current, three-phase line voltage and residual voltage；
2) data obtained based on step 1) carry out single-phase wire break fault initiating condition distinguishing to each measurement point respectively, if
Meet entry condition then to enter step 3)；The return step 1 if being unsatisfactory for entry condition)；
3) data obtained based on step 1) carry out single-phase wire break fault actions condition distinguishing to each measurement point respectively, if
Meet operation condition then to enter step 4)；The return step 1 if being unsatisfactory for operation condition)；
4) broken string is separate to be determined according to single-phase wire break failure separate decision condition respectively to each measurement point.
Preferably, the position of the measurement point is the outlet of every route and each bifurcation in distribution network system.
Preferably, single-phase wire break fault initiating condition in the step 2) are as follows: residual voltage is greater than default residual voltage and opens
Dynamic definite value, while three-phase line voltage is symmetrical.
Preferably, single-phase wire break fault actions condition includes: in the step 3)
31) forward-order current is decreased below default forward-order current definite value；
32) negative-sequence current, which rises to, is higher than default negative phase-sequence current ration；
33) a certain phase voltage rises phase current decline simultaneously；
When meeting above three condition simultaneously, then meet single-phase wire break fault actions condition, determines that measurement point institute is online
Single-phase wire break failure occurs for road.
Preferably, single-phase wire break fault actions condition in the step 3) further include:
34) negative -sequence power direction is opposite direction；
When meeting aforementioned four condition simultaneously, then meet single-phase wire break fault actions condition, determines that measurement point institute is online
Single-phase wire break failure occurs for road.
Preferably, single-phase wire break fault actions condition in the step 3) specifically:
31) forward-order current is decreased below default forward-order current definite value, and specially decline percentage is more than the positive sequence set
Threshold k1；
32) negative-sequence current, which rises to, is higher than default negative phase-sequence current ration, specially super with the ratio of failure preload electric current
Cross the negative phase-sequence threshold k2 of setting；
33) a certain phase voltage rises phase current decline simultaneously, and specially a certain phase voltage rising value is greater than the phase of setting
Voltage threshold U.set, while phase current decline percentage is more than the phase current threshold k3 of setting.
Preferably, the separate decision condition of single-phase wire break failure described in the step 4) are as follows: when single-phase wire break failure occurs
Voltage rise and electric current decline it is separate, that is, meet the separate decision condition of single-phase wire break failure it is separate for failure it is separate.
It preferably, further include determining that corresponding measurement point issues single-phase wire break fault warning prompt letter while broken string is separate
Number, relative to source side, fault point is located at the rear of the current measurement point.
Invent achieved the utility model has the advantages that the present invention is a kind of single-phase wire break fault detection method suitable for power distribution network,
Realize that single-phase wire break failure accurately identifies in the distribution network line of multiple-limb load, for be further processed disconnection fault provide according to
According to.It is separate and former that the faulty line that single-phase wire break failure occurs in distribution network system, failure can be recognized accurately in the present invention
The relative position for hindering point, cooperates the application of practical protective relaying device, and timely identification and processing to disconnection fault may be implemented,
To effectively avoid distribution network system because endangering caused by single-phase wire break failure occurs, have a good application prospect.
Detailed description of the invention
Fig. 1 is a kind of flow chart of single-phase wire break fault detection method suitable for power distribution network of the embodiment of the present invention；
Fig. 2 is a kind of system signal of single-phase wire break fault detection method suitable for power distribution network of the embodiment of the present invention
Figure；
Fig. 3 is a kind of fault distinguishing of single-phase wire break fault detection method suitable for power distribution network of the embodiment of the present invention
Logic chart.
Specific embodiment
Below according to attached drawing and technical solution of the present invention is further elaborated in conjunction with the embodiments.
As shown in Figure 1, a kind of single-phase wire break fault detection method suitable for power distribution network, comprising the following steps:
1) three-phase voltage and three-phase current of acquisition measurement point in real time, and carries out calculation processing, extract forward-order current,
Negative-sequence current, three-phase line voltage and residual voltage；
Establish measurement point before acquisition data, the position of the measurement point be in distribution network system the outlet of every route and
At each branch (branch's number >=0 when), as shown in Figure 2.
2) data obtained based on step 1) carry out single-phase wire break fault initiating condition distinguishing to each measurement point respectively, if
Meet entry condition then to enter step 3)；The return step 1 if being unsatisfactory for entry condition)；
Single-phase wire break fault initiating condition in the step 2) are as follows: residual voltage is greater than default residual voltage and starts definite value
(zero voltage starting definite value in figure), while three-phase line voltage is symmetrical.
3) data obtained based on step 1) carry out single-phase wire break fault actions condition distinguishing to each measurement point respectively, if
Meet operation condition then to enter step 4)；The return step 1 if being unsatisfactory for operation condition)；
Single-phase wire break fault actions condition includes: in the step 3)
31) forward-order current is decreased below default forward-order current definite value；
32) negative-sequence current, which rises to, is higher than default negative phase-sequence current ration；
33) a certain phase voltage rises phase current decline simultaneously；
When meeting above three condition simultaneously, then meet single-phase wire break fault actions condition, determines that measurement point institute is online
Single-phase wire break failure occurs for road.
Single-phase wire break fault actions condition in the step 3) specifically:
31) forward-order current is decreased below default forward-order current definite value, and specially decline percentage is more than the positive sequence set
Threshold k1；
32) negative-sequence current, which rises to, is higher than default negative phase-sequence current ration, specially super with the ratio of failure preload electric current
Cross the negative phase-sequence threshold k2 of setting；
33) a certain phase voltage rises phase current decline simultaneously, and specially a certain phase voltage rising value is greater than the phase of setting
Voltage threshold U.set, while phase current decline percentage is more than the phase current threshold k3 of setting.
Single-phase wire break fault actions condition in the step 3) further include:
34) negative -sequence power direction is opposite direction；
When meeting aforementioned four condition simultaneously, then meet single-phase wire break fault actions condition, determines that measurement point institute is online
Single-phase wire break failure occurs for road.
Negative -sequence power direction is that opposite direction refers to that the phase of negative sequence voltage is ahead of the phase of negative-sequence current.Negative sequence power side
It is mainly used for distinguishing faulty line and non-fault line to the condition for opposite direction, when an only outlet in distribution network system
When, which can not need or be used only as supplementary condition.
4) broken string is separate to be determined according to single-phase wire break failure separate decision condition respectively to each measurement point；
The separate decision condition of single-phase wire break failure described in the step 4) are as follows: voltage when single-phase wire break failure occurs and rises
And electric current decline is separate, that is, meeting the separate of the separate decision condition of single-phase wire break failure is that failure is separate.
The present embodiment further includes determining that corresponding measurement point issues single-phase wire break fault warning prompt while broken string is separate
Signal, relative to source side, fault point is located at the rear of the current measurement point.Specific fault distinguishing logic chart is as shown in Figure 3.
Working principle of the present invention is as follows:
Establish measurement point respectively in the outlet of distribution network line and each bifurcation, each measurement point independently into
Acquisition, extraction and the execution of corresponding criterion of row signal, the measurement point of single-phase wire break fault actions condition is met for determining,
Fault warning prompt is provided in time.The distribution network line more for branch, the closer measurement point of distance fault point, failure are special
Sign is more obvious, i.e., it more easily identifies out disconnection fault；And for the farther away measurement point of distance fault point, because fault signature is not
Obviously, possibly disconnection fault can not be identified, but since each measurement point independently carries out fault distinguishing and alarm prompt, so
It has disconnection fault even if part measurement point is unidentified and nor affect on identifying and positioning for whole route single-phase wire break failure.In addition,
The single-phase wire break fault actions criterion as used by this method needs while meeting multiple data qualifications, i.e. operation condition
It is more stringent, it can be happened to avoid erroneous judgement caused by other failures in electric system.
The foregoing is merely the preferred embodiment of the present invention, to illustrate technical solution of the present invention, rather than limit it
System；It is noted that, modifying the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out
Equivalent replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of single-phase wire break fault detection method suitable for power distribution network, which comprises the following steps:
1) three-phase voltage and three-phase current of measurement point are acquired in real time, and carries out calculation processing, extract forward-order current, negative phase-sequence
Electric current, three-phase line voltage and residual voltage；
2) data obtained based on step 1) carry out single-phase wire break fault initiating condition distinguishing to each measurement point respectively, if meeting
3) entry condition then enters step；The return step 1 if being unsatisfactory for entry condition)；
3) data obtained based on step 1) carry out single-phase wire break fault actions condition distinguishing to each measurement point respectively, if meeting
4) operation condition then enters step；The return step 1 if being unsatisfactory for operation condition)；
4) broken string is separate to be determined according to single-phase wire break failure separate decision condition respectively to each measurement point.
2. a kind of single-phase wire break fault detection method suitable for power distribution network according to claim 1, which is characterized in that institute
The position for stating measurement point is the outlet of every route and each bifurcation in distribution network system.
3. a kind of single-phase wire break fault detection method suitable for power distribution network according to claim 1, which is characterized in that institute
State single-phase wire break fault initiating condition in step 2) are as follows: residual voltage is greater than default residual voltage and starts definite value, while triple line
Voltage symmetry.
4. a kind of single-phase wire break fault detection method suitable for power distribution network according to claim 1, which is characterized in that institute
Stating single-phase wire break fault actions condition in step 3) includes:
31) forward-order current is decreased below default forward-order current definite value；
32) negative-sequence current, which rises to, is higher than default negative phase-sequence current ration；
33) a certain phase voltage rises phase current decline simultaneously；
When meeting above three condition simultaneously, then meet single-phase wire break fault actions condition, route hair where determining the measurement point
Raw single-phase wire break failure.
5. a kind of single-phase wire break fault detection method suitable for power distribution network according to claim 4, which is characterized in that institute
State single-phase wire break fault actions condition in step 3) further include:
34) negative -sequence power direction is opposite direction；
When meeting aforementioned four condition simultaneously, then meet single-phase wire break fault actions condition, route hair where determining the measurement point
Raw single-phase wire break failure.
6. a kind of single-phase wire break fault detection method suitable for power distribution network according to claim 4, which is characterized in that institute
State single-phase wire break fault actions condition in step 3) specifically:
31) forward-order current is decreased below default forward-order current definite value, and specially decline percentage is more than the positive sequence threshold set
k1；
32) negative-sequence current, which rises to, is higher than default negative phase-sequence current ration, is more than specially to set with the ratio of failure preload electric current
Fixed negative phase-sequence threshold k2；
33) a certain phase voltage rises phase current decline simultaneously, and specially a certain phase voltage rising value is greater than the phase voltage of setting
Threshold U.set, while phase current decline percentage is more than the phase current threshold k3 of setting.
7. a kind of single-phase wire break fault detection method suitable for power distribution network according to claim 1, which is characterized in that institute
State the separate decision condition of single-phase wire break failure described in step 4) are as follows: voltage rising when single-phase wire break failure occurs and electric current declines
It is separate, that is, meet the separate decision condition of single-phase wire break failure it is separate for failure it is separate.
8. a kind of single-phase wire break fault detection method suitable for power distribution network according to claim 1, which is characterized in that also
Corresponding measurement point issues single-phase wire break fault warning standby signal while including determining that broken string is separate, relative to source side,
Fault point is located at the rear of the current measurement point.
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| CN109839574A (en) * | 2019-03-29 | 2019-06-04 | 云南电网有限责任公司电力科学研究院 | A kind of single-phase wire break fault isolation device and method |
| CN110320432A (en) * | 2019-06-04 | 2019-10-11 | 国网江苏省电力有限公司无锡供电分公司 | Single-phase wire break fault detection and guard method and system |
| CN113422356A (en) * | 2021-07-08 | 2021-09-21 | 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 |
| CN115113001A (en) * | 2022-07-12 | 2022-09-27 | 国网江苏省电力有限公司宿迁供电分公司 | Self-adaptive power distribution network single-phase disconnection fault positioning method |
| CN115166596A (en) * | 2022-06-20 | 2022-10-11 | 国网湖南省电力有限公司 | Yd11 wiring transformer single-phase wire break on-line monitoring method |
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| CN109839574A (en) * | 2019-03-29 | 2019-06-04 | 云南电网有限责任公司电力科学研究院 | A kind of single-phase wire break fault isolation device and method |
| CN110320432A (en) * | 2019-06-04 | 2019-10-11 | 国网江苏省电力有限公司无锡供电分公司 | Single-phase wire break fault detection and guard method and system |
| CN110320432B (en) * | 2019-06-04 | 2021-08-20 | 国网江苏省电力有限公司无锡供电分公司 | Single-phase line-breaking fault detection and protection method and system |
| CN113422356A (en) * | 2021-07-08 | 2021-09-21 | 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 |
| 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 |
| CN115166596A (en) * | 2022-06-20 | 2022-10-11 | 国网湖南省电力有限公司 | Yd11 wiring transformer single-phase wire break on-line monitoring method |
| CN115113001A (en) * | 2022-07-12 | 2022-09-27 | 国网江苏省电力有限公司宿迁供电分公司 | Self-adaptive power distribution network single-phase disconnection fault positioning method |
| CN115113001B (en) * | 2022-07-12 | 2023-10-20 | 国网江苏省电力有限公司宿迁供电分公司 | Self-adaptive power distribution network single-phase disconnection fault positioning method |
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