CN103235238A - Transmission line travelling wave recording method - Google Patents
Transmission line travelling wave recording method Download PDFInfo
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- CN103235238A CN103235238A CN2013101410545A CN201310141054A CN103235238A CN 103235238 A CN103235238 A CN 103235238A CN 2013101410545 A CN2013101410545 A CN 2013101410545A CN 201310141054 A CN201310141054 A CN 201310141054A CN 103235238 A CN103235238 A CN 103235238A
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Abstract
The invention provides a transmission line travelling wave recording method and belongs to the technical field of electricity according to the classification of international patent classification (IPC) table. The problems that when the current waveform monitoring method based on threshold triggering is used for monitoring high-resistance ground, a travelling signal cannot be monitored due to being relatively weak, and after triggering threshold of travelling wave monitoring is purely reduced, uploaded data amount is large, error triggering waveforms are excessive in number, a fault waveform is difficultly identified and selected, and meanwhile the service life of a monitoring terminal is shortened, the data transmission cost is increased, and the fault diagnosis difficulty is increased are solved. Power-frequency fault monitoring and travelling wave fault monitoring are combined, fault moment information is accurately extracted according to waveform information in a power-frequency fault, and travelling wave current at the fault moment is accurately extracted, so that fault real-time wave recording of fault components is realized, and the identifying precision of the waveform is improved. The monitoring method is simple and small in waveform error triggering number, and has the characteristic of real-time online ability.
Description
Technical field
The present invention relates to power system transmission line localization of fault field, particularly Travelling Wave Fault Location field.
Background technology
Travelling Wave Fault Location is a kind of emerging Fault-Locating Test, and wherein can the waveform of fault moment normally be gathered, and is to be related to the important step that capable wave energy negates the position.And the travelling wave current of a lot of high resistance grounds has little, less with the interference row wave amplitude difference in the circuit characteristic of current amplitude, has brought very big difficulty for row ripple collection and identification.
Present technology is used power current and travelling wave current to trigger respectively with the mode that catches and is obtained fault moment information.This mode has poor resolution characteristic for fainter travelling wave signal.Fault traveling wave under therefore a lot of high resistance ground situations is difficult to gather and differentiates.
Present a lot of ways are to make high resistance ground capable ripple constantly be triggered and upload by reducing capable ripple activation threshold value, but this method can be followed a large amount of capable ripple false triggerings, increase the communication burden, reduce equipment life, but also can increase the workload of data identification and screening.
Summary of the invention
The purpose of this patent is to propose a kind of transmission line travelling wave Wave record method, to solve traditional waveform monitoring method based on threshold triggers when the reply monitoring high resistance ground, travelling wave signal fainter and frequent occur existing behind the activation threshold value of monitoring less than the situation of travelling wave signal and existing pure reduction row ripple monitoring upload that data volume is big, the false triggering waveform is many, fault waveform is difficult to identification and screening, also can cause the reduction of monitoring terminal life-span simultaneously, the data transmission cost increases, and a series of problems such as fault diagnosis difficulty increase.
It is by adopting following new technical scheme to realize that the present invention will solve the problems of the technologies described above: use Luo-coil to extract the power transmission line power frequency current waveform based on the mode of real-time acquisition process, adopt the mode that record is uploaded after triggering to gather the power transmission line power frequency current waveform in real time; When power current triggers, deposit the fault moment waveform in L2 cache, extract power frequency component and the fault component of the capable ripple of fault moment; Carry out the fault validation verification after depositing the fault moment waveform in, still can keep the frequency characteristic of power frequency based on normal fault waveform, if after triggering, high frequency waveforms exists per half power frequency period to pass through zero point one time, is judged as and breaks down; The phenomenon of defluidization can take place according to separating brake constantly, when the maximal value of next cycle during much smaller than the maximal value of previous cycle, be engraved in the intersection point place of two cycles when thinking separating brake, be positioned at the preceding four/one-period of back one-period place, extract separating brake waveform constantly, and upload.
Compared with the prior art, with respect to existing waveform monitoring method based on threshold triggers, this method has the following advantages: have identification precision height to waveform, monitoring method is simple, waveform false triggering number is few and possesses the good characteristics of real-time online ability etc.
Description of drawings
Fig. 1 has represented the oscillogram of a power frequency that breaks down;
Fig. 2 is the oscillogram of fault component;
Fig. 3 realizes the algorithm pattern of the real-time record ripple of row ripple;
Fig. 4 realizes the process flow diagram of the real-time record ripple of row ripple.
Embodiment
This method sudden change can occur according to the fault moment power current, utilizes the fault component method to find out accurate fault-time, extracts fault moment and trigger the waveform of uploading in short-term.Principle is as described below:
The power frequency waveform is the present 50Hz sinusoidal current waveform of transmission on the line that we use, and when handling the power frequency waveform, we adopt following basic assumption usually:
(1) be desirable smooth sinusoidal waveform through the power frequency waveform after the filtering processing.
(2) frequency of normal power frequency waveform can not change, and is 50Hz in China.
Power current when (3) circuit moves can not take place significantly to suddenly change.
Fig. 1 has represented the oscillogram of a power frequency that breaks down, and the fault moment power current raises suddenly, and separating brake moment electric current reduces suddenly.In order to handle the process that electric current raises easily, the power frequency waveform that collects deducts its normal power current, namely obtains the oscillogram of fault component, as shown in Figure 2.
Based on the characteristic of power frequency load current, Fig. 2 leading portion presents the less characteristic of variable quantity, should be 0 straight line under the ideal state, when fault, because fault current is bigger, differentiation is clearly arranged during with normal power frequency.Separating brake current attenuation constantly is 0, and fault component can present normal power frequency characteristic, and the intersection between the different qualities is fault moment and separating brake constantly.
Transient characterisitics when travelling wave current has reflected current transients, therefore the row ripple results from fault moment and the separating brake moment.Accurately the fault location moment and the separating brake moment, namely can accurately find the generation time of fault traveling wave, and by searching this capable wave-wave shape constantly, obtain the capable ripple that has trouble spot information.Simultaneously, also need very short time fault location constantly and separating brake constantly because fault location cost constantly is more long, need the capable wave datum of buffer memory more many, also can be more big to the pressure of system.Therefore, we propose the algorithm thought as Fig. 3, realize the real-time record ripple of row ripple, and calculation flow chart is seen Fig. 4, and concrete implementation method is as follows:
1, the extraction of power current waveform
The power current waveform uses Luo-coil to adopt the mode of real-time acquisition process to extract, and adopts the mode that record is uploaded after triggering to gather.
2, the extraction of the capable ripple of fault moment
Travelling wave signal uses the collection of Luo-coil real-time continuous, adopts the mode of buffer memory to carry out record, when power current triggers, deposits the fault moment waveform in L2 cache, uploads after validation fault takes place.
3, the checking of fault validity
Normal fault waveform still can keep the frequency characteristic of power frequency, relies on this characteristic, and we can judge if after triggering, high frequency waveforms exists per half power frequency period to pass through zero point one time, then for breaking down.
4, the separating brake extraction of waveform constantly
The phenomenon of defluidization can take place constantly in separating brake, therefore we can be according to this characteristic, when the maximal value of next cycle during much smaller than the maximal value of previous cycle, we are engraved in the intersection point place of two cycles when then thinking separating brake, and the position is the preceding four/one-period of back one-period place.Upload power frequency waveform and high frequency waveforms at last.
Claims (6)
1. transmission line travelling wave Wave record method, it is characterized in that: this method is that power frequency malfunction monitoring and traveling wave fault monitoring are combined, rely on shape information in the power frequency fault whether accurately to judge fault and fault moment, when being judged to be true fault, extract separating brake capable wave-wave shape constantly, and upload.
2. transmission line travelling wave Wave record method according to claim 1 is characterized in that: power frequency malfunction monitoring and traveling wave fault monitoring are in conjunction with specifically may further comprise the steps:
Gather the power transmission line power frequency current waveform in real time;
Extract power frequency component and the fault component of the capable ripple of fault moment;
Power frequency component or fault component are carried out the checking of the validity of fault;
Extract separating brake capable wave-wave shape constantly, and upload.
3. transmission line travelling wave Wave record method according to claim 2 is characterized in that: use Luo-coil to extract the power transmission line power frequency current waveform based on the mode of real-time acquisition process, adopt the mode that record is uploaded after triggering to gather.
4. transmission line travelling wave Wave record method according to claim 3 is characterized in that: when power current triggers, deposit the fault moment waveform in L2 cache, upload after validation fault takes place.
5. transmission line travelling wave Wave record method according to claim 4 is characterized in that: carry out the fault validation verification after depositing the fault moment waveform in; Still can keep the frequency characteristic of power frequency based on normal fault waveform, if after triggering, high frequency waveforms exists per half power frequency period to pass through zero point one time, is judged as and breaks down; Otherwise, then be not fault.
6. a kind of transmission line travelling wave Wave record method according to claim 5, it is characterized in that: separating brake is the extraction of waveform constantly, the phenomenon of defluidization can take place according to separating brake constantly, when the maximal value of next cycle during much smaller than the maximal value of previous cycle, be engraved in the intersection point place of two cycles when thinking separating brake, be positioned at the preceding four/one-period of back one-period place.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085166A (en) * | 2017-04-13 | 2017-08-22 | 中国南方电网有限责任公司 | A kind of travelling wave ranging method for adapting to the intensive thunderbolt of transmission line of electricity |
| CN107831351A (en) * | 2017-11-30 | 2018-03-23 | 中国工程物理研究院激光聚变研究中心 | A kind of streak camera scanning impulse monitoring device |
| CN108957231A (en) * | 2018-07-17 | 2018-12-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of method of distributed system and its host and handset data interaction |
| CN110161376A (en) * | 2019-06-24 | 2019-08-23 | 四川电安智能科技有限公司 | A kind of traveling wave fault moment extraction algorithm |
| CN110703033A (en) * | 2019-09-17 | 2020-01-17 | 国电南瑞科技股份有限公司 | Weak fault traveling wave signal enhancement method |
| CN110954729A (en) * | 2019-12-27 | 2020-04-03 | 国网河北省电力有限公司电力科学研究院 | Continuous recording device of power system |
Families Citing this family (1)
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| CN109557417B (en) * | 2018-12-12 | 2020-09-25 | 国电南瑞科技股份有限公司 | Distributed traveling wave diagnosis starting method and system for power transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107085166A (en) * | 2017-04-13 | 2017-08-22 | 中国南方电网有限责任公司 | A kind of travelling wave ranging method for adapting to the intensive thunderbolt of transmission line of electricity |
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| CN108957231A (en) * | 2018-07-17 | 2018-12-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of method of distributed system and its host and handset data interaction |
| CN108957231B (en) * | 2018-07-17 | 2021-09-14 | 国网辽宁省电力有限公司电力科学研究院 | Distributed system and method for data interaction between host machine and submachine of distributed system |
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| CN110703033A (en) * | 2019-09-17 | 2020-01-17 | 国电南瑞科技股份有限公司 | Weak fault traveling wave signal enhancement method |
| CN110954729A (en) * | 2019-12-27 | 2020-04-03 | 国网河北省电力有限公司电力科学研究院 | Continuous recording device of power system |
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