CN108535600A - A kind of transmission line fault judgment means - Google Patents
A kind of transmission line fault judgment means Download PDFInfo
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- CN108535600A CN108535600A CN201810353981.6A CN201810353981A CN108535600A CN 108535600 A CN108535600 A CN 108535600A CN 201810353981 A CN201810353981 A CN 201810353981A CN 108535600 A CN108535600 A CN 108535600A
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- transmission line
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- sample rate
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
Abstract
The present invention provides a kind of transmission line fault judgment means, including：Electricity taking coil, be located at the transmission line of electricity near, according to preset ratio by the current transformation of the transmission line of electricity be sample rate current；Waveform acquisition module, the waveform for obtaining the sample rate current；For determining whether according to the waveform transmission line fault occurs for judging device；Communication device, for the fault message to be uploaded to remote server.Communicator is at least one of RF receiving and transmission module, bluetooth module, WIFI module or wire transmission module.The good characteristics high with the identification precision to waveform, monitoring method is simple, waveform false triggering number is few and has real-time online ability etc..
Description
Technical field
The present invention relates to power system transmission line breakdown judge fields, especially Travelling Wave Fault Location field, especially
Refer to a kind of transmission line fault judgment means.
Background technology
After transmission of electricity is the electric energy boosting for generator being sent out with transformer, then through control devices such as breakers access power transmission line
Road is realized.By structure type, transmission line of electricity is divided into overhead transmission line and cable run.Overhead transmission line route route lever
The compositions such as tower, conducting wire, insulator, line hardware, bracing wire, pole and tower foundation, earthing or grounding means, are erected on ground.According to conveying
The property of electric current, transmission of electricity are divided into ac transmission and direct current transportation.Line accident refers to causing line powering due to various reasons
It interrupts suddenly, after accident occurs, only finds accident point first and determine accident pattern, can just find out cause of accident and take and rob
Measure is repaiied, the normal operation for the circuit that restores electricity, and similar accident occurs after preventing.Transmission line malfunction common are defeated
Electric line windage yaw discharge failure, lightning stroke trip, strands break, transmission line icing failure, circuit pollution flashover, circuit external force destructive malfunction,
Circuit bird pest failure etc..Traveling wave fault judgement is a kind of emerging fault location technology, and can the waveform of wherein fault moment
Can normal acquisition be the important link that is related to traveling wave and position.And the travelling wave current of many high resistance grounds has current amplitude
Small, smaller with the interference traveling wave amplitude difference in circuit characteristic brings prodigious difficulty to traveling wave acquisition with identification.
Current technology triggers the mode with capturing using power current and travelling wave current and believes to obtain fault moment respectively
Breath.This mode has poor resolution capability for fainter travelling wave signal.Therefore in the case of many high resistance grounds
Fault traveling wave be difficult to acquire and differentiate.Current many ways are to make the high resistance ground moment by reducing traveling wave activation threshold value
Traveling wave is able to trigger and upload, but this method can increase communication burden, reduce the equipment longevity with a large amount of traveling wave false triggering
Life, but also the workload of data identification and screening can be increased.
Invention content
The purpose of this patent is to propose a kind of a kind of power transmission line carrying out breakdown judge according to transmission line travelling wave recording
Failure judgment device, including：Electricity taking coil is located near the transmission line of electricity, according to preset ratio by the power transmission line
The current transformation on road is sample rate current；Waveform acquisition module, the waveform for obtaining the sample rate current；Judging device is used for root
Determine whether that transmission line fault occurs according to the waveform；Communication device, for the fault message to be uploaded to remote server.
Further, communicator is that RF receiving and transmission module, bluetooth module, WIFI module or wire transmission mould are in the block at least
One.
Compared with the prior art, the waveform monitoring method based on threshold triggers relative to existing, the present apparatus have following
Advantage：With the identification precision to waveform is high, monitoring method is simple, waveform false triggering number is few and has real-time online ability
Deng good characteristics.
Specific implementation mode
With reference to application example, the present invention is described in further detail.
Embodiment one.
A kind of transmission line fault judgment means, including：Electricity taking coil is located near the transmission line of electricity, according to default
Ratio by the current transformation of the transmission line of electricity be sample rate current；Waveform acquisition module, for obtaining the sample rate current
Waveform；For determining whether according to the waveform transmission line fault occurs for judging device；Communication device, for believing the failure
Breath is uploaded to remote server.
Embodiment two.
A kind of transmission line fault judgment means, including：Electricity taking coil is located near the transmission line of electricity, according to default
Ratio by the current transformation of the transmission line of electricity be sample rate current；Waveform acquisition module, for obtaining the sample rate current
Waveform；For determining whether according to the waveform transmission line fault occurs for judging device；Communication device, for believing the failure
Breath is uploaded to remote server.The present embodiment also creativeness gives a kind of resolving method of abnormal traveling wave comprising such as
Lower step：
Step 1：Sample rate current is monitored in a monitoring cycle, and obtains its waveform；
Step 2：The waveform is analyzed, in the monitoring cycle, to obtain the amplitude x of the wavei, wherein i is 1 to n
Natural number, n be one monitoring cycle in wave number；
Step 3：Recursive calculation is carried out by following formula (1), finds out the amplitude x of the waveiMean value computation value Yn：
Yn=(1-k) Yn-1+kxn (1)
In formula (1), xnFor the amplitude for the wave that the n-th moment measured；YnFor n-th recurrence when, amplitude xiMean value computation
Value；K is computational constant；
Step 4：Recursive calculation is carried out again by formula (2), finds out amplitude xiMean-square value ZnCalculated value；
Zn=(1-k) Zn-1+kxn 2 (2)
ZnFor n-th recurrence when, amplitude xiMean-square value calculated value；
Step 5：X is sought by formula (3)iCalculated value standard value standard (xi)；
Standard (x)=Yn 2-Zn(3)；
Step 6：Again by formula (4), to xiCarry out binary judgement；
S=xi-Yn*standard(xi) (4)
Step 7：Think to occur when S is more than zero not normal.
Embodiment three.
A kind of transmission line fault judgment means, including：Electricity taking coil is located near the transmission line of electricity, according to default
Ratio by the current transformation of the transmission line of electricity be sample rate current；Waveform acquisition module, for obtaining the sample rate current
Waveform；For determining whether according to the waveform transmission line fault occurs for judging device；Communication device, for believing the failure
Breath is uploaded to remote server.The present embodiment also creativeness gives a kind of resolving method of abnormal traveling wave comprising such as
Lower step：
Step 1：Sample rate current is monitored in a monitoring cycle, and obtains its waveform；
Step 2：The waveform is analyzed, in the monitoring cycle, to obtain the amplitude x of the wavei, wherein i is 1 to n
Natural number, n be one monitoring cycle in wave number；
Step 3：Recursive calculation is carried out by following formula (1), finds out the amplitude x of the waveiMean value computation value Yn：
Yn=(1-k) Yn-1+kxn (1)
In formula (1), xnFor the amplitude for the wave that the n-th moment measured；YnFor n-th recurrence when, amplitude xiMean value computation
Value；K is computational constant, and k values, which are 0.005, k, here is worth value to influence the precision judged, can pass through limited experiment
It goes preferentially to obtain.
Step 4：Recursive calculation is carried out again by formula (2), finds out amplitude xiMean-square value ZnCalculated value；
Zn=(1-k) Zn-1+kxn 2 (2)
ZnFor n-th recurrence when, amplitude xiMean-square value calculated value；
Step 5：X is sought by formula (3)iCalculated value standard value standard (xi)；
Standard (x)=Yn 2-Zn(3)；
Step 6：Again by formula (4), to xiCarry out binary judgement；
S=xi-Yn*standard(xi) (4)
Step 7：Think to occur when S is more than zero not normal.
Example IV.
A kind of transmission line fault judgment means, including：Electricity taking coil is located near the transmission line of electricity, according to default
Ratio by the current transformation of the transmission line of electricity be sample rate current；Waveform acquisition module, for obtaining the sample rate current
Waveform；For determining whether according to the waveform transmission line fault occurs for judging device；Communication device, for believing the failure
Breath is uploaded to remote server.
Further, communicator is that RF receiving and transmission module, bluetooth module, WIFI module or wire transmission mould are in the block at least
One.The present embodiment extracts power transmission line power frequency current waveform using Rogowski coil based on the mode of timely collection, adopts
Power transmission line power frequency current waveform is acquired in real time with the mode for recording upload after triggering；When power current triggers, when by failure
It carves waveform and is stored in L2 cache, extract the power frequency component and fault component of fault moment traveling wave；It is laggard to be stored in fault moment waveform
Row failure validation verification, the frequency characteristic of power frequency still can be retained based on normal fault waveform, if after triggering, high frequency waveforms are deposited
A zero is passed through in every half of power frequency period, is judged as breaking down；According to the separating brake moment can there is a phenomenon where defluidizations, instantly
When the maximum value of one cycle is much smaller than the maximum value of previous cycle, it is believed that the separating brake moment in the point of intersection of two cycles, is located at
Before the latter period at a quarter period, the waveform at separating brake moment is extracted, and is uploaded.
Compared with the prior art, the waveform monitoring method based on threshold triggers relative to existing, this method have following
Advantage：With the identification precision to waveform is high, monitoring method is simple, waveform false triggering number is few and has real-time online ability
Deng good characteristics.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (2)
1. a kind of transmission line fault judgment means, including：
Electricity taking coil is located near the transmission line of electricity, is by the current transformation of the transmission line of electricity according to preset ratio
Sample rate current；Waveform acquisition module, the waveform for obtaining the sample rate current；
For determining whether according to the waveform transmission line fault occurs for judging device；Communication device is used for the fault message
It is uploaded to remote server.
2. transmission line fault judgment means as described in claim 1, which is characterized in that
Communicator is at least one of RF receiving and transmission module, bluetooth module, WIFI module or wire transmission module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810353981.6A CN108535600A (en) | 2018-04-19 | 2018-04-19 | A kind of transmission line fault judgment means |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810353981.6A CN108535600A (en) | 2018-04-19 | 2018-04-19 | A kind of transmission line fault judgment means |
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| CN108535600A true CN108535600A (en) | 2018-09-14 |
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| CN201810353981.6A Withdrawn CN108535600A (en) | 2018-04-19 | 2018-04-19 | A kind of transmission line fault judgment means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633380A (en) * | 2019-02-19 | 2019-04-16 | 珠海妙微科技有限公司 | A kind of transmission open acess system |
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Application publication date: 20180914 |