CN103487721A - Traveling wave distance measuring system based on electronic transformer - Google Patents
Traveling wave distance measuring system based on electronic transformer Download PDFInfo
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- CN103487721A CN103487721A CN201310337830.9A CN201310337830A CN103487721A CN 103487721 A CN103487721 A CN 103487721A CN 201310337830 A CN201310337830 A CN 201310337830A CN 103487721 A CN103487721 A CN 103487721A
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Abstract
The invention discloses a traveling wave distance measuring system based on an electronic transformer. The traveling wave distance measuring system comprises the electronic current transformer, a low-frequency signal collecting circuit and a secondary processing circuit. The electronic current transformer comprises an annular hollow coil which is connected with the secondary processing circuit through the low-frequency signal collecting circuit, and the electronic current transformer further comprises a traveling wave signal high-speed collecting circuit, a traveling wave signal merging unit, a traveling wave signal processing unit and a 61850 standard traveling wave data transmission unit. The annular hollow coil of the electronic current transformer is sequentially connected with the traveling wave signal high-speed collecting circuit, the traveling wave signal merging unit, the traveling wave signal processing unit and the 61850 standard traveling wave data transmission unit and outputs traveling wave signals, wherein the annular hollow coil is a Rogowski annular hollow coil. While the original structure of the low-frequency signal collecting and output circuit is kept, the traveling wave signal collecting and output circuit is added, and thus the traveling wave distance measuring system is suitable for being used for the electronic current transformer.
Description
Technical field
The present invention relates to a kind of travelling wave ranging system based on electronic mutual inductor.
Background technology
Along with the development of intelligent grid, the digitizing of transformer station has become a kind of trend.And, in digital transformer substation, because some first and second equipment and the method for operation are different from conventional transformer station, therefore more original equipment cisco unity malfunction only could continue to be applied to digital transformer substation after improvement.Just there is the problem of this respect in traveling wave ranging device as line fault range finding location use.
In digital transformer substation, traveling wave ranging device is the same with traditional transformer station on range measurement principle, and both Main Differences are the change of signal extraction and processing mode.In traditional transformer station, mainly to utilize electromagnetic type CT/PT to obtain traveling wave fault information, and due to what adopt, be electronic mutual inductor in digital transformer substation, so how from electronic mutual inductor, extracting available traveling wave fault information just becomes the key that realizes travelling wave ranging.
Because the main satisfied protection on sample frequency of existing electronic mutual inductor waits functional requirement; thereby its sample frequency is substantially in 10kHz; although can be able to meet the requirement that protection waits equipment; but the signal of the upper megahertz needed for traveling wave fault location; existing electronic mutual inductor can not provide, thereby can not meet the requirement of travelling wave ranging.Therefore, in digital transformer substation, to realize the traveling wave fault location function, at first will solve the extraction problem of travelling wave signal.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of travelling wave ranging system based on electronic mutual inductor.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: the travelling wave ranging system based on electronic mutual inductor comprises electronic current mutual inductor, low frequency signal Acquisition Circuit and secondary treating circuit; Electronic current mutual inductor comprises annular air core coil, the annular air core coil is connected with the secondary treating circuit by the low frequency signal Acquisition Circuit, also comprises travelling wave signal high speed acquisition circuit, travelling wave signal merge cells, travelling wave signal processing unit and 61850 standard row wave datum transmission units; The annular air core coil of electronic current mutual inductor is connected with travelling wave signal high speed acquisition circuit, travelling wave signal merge cells, travelling wave signal processing unit and 61850 standard row wave datum transmission units successively and exports travelling wave signal (should be more than fault-signal, also comprise normal travelling wave signal).
As preferably, annular air core coil is Rogowski annular air core coil.
Preferred as another, the travelling wave signal of output is not less than 1MHz.
The invention has the beneficial effects as follows:
In the original structure that keeps low frequency signal collection and output circuit, increase by road travelling wave signal collection and an output circuit, to be applicable to the use of electronic current mutual inductor.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the structural representation that the present invention is based on the travelling wave ranging system embodiment of electronic mutual inductor.
Embodiment
Fig. 1 is based on the travelling wave ranging system of electronic mutual inductor, electronic current mutual inductor, low frequency signal Acquisition Circuit and secondary treating circuit, travelling wave signal high speed acquisition circuit, travelling wave signal merge cells, travelling wave signal processing unit and 61850 standard row wave datum transmission units, consists of.
Wherein, electronic current mutual inductor comprises annular air core coil, and annular air core coil is connected with the secondary treating circuit by the low frequency signal Acquisition Circuit, for collection and the transmission of low frequency signal.
The annular air core coil of electronic current mutual inductor is connected with travelling wave signal high speed acquisition circuit, travelling wave signal merge cells, travelling wave signal processing unit and 61850 standard row wave datum transmission units successively and exports the travelling wave signal for traveling wave fault location.
The coil form electronic current mutual inductor is commonly called as Luo-coil type electronic current mutual inductor, it is by the Rogowski annular air core coil primary current of inducting, transfer to electrical secondary system through being arranged on after on high-tension side electronic circuit board is converted to light signal by the current signal of inducting again, with traditional electromagnetic current transducer, compare, it has realized high and low pressure side isolation, and its principle is still electromagnetic induction principle.Electronic current mutual inductor under this mode, its sample frequency in 10kHz, in order to realize the traveling wave fault signal output of electronic mutual inductor, has been done following change to it substantially:
As shown in Figure 1, in the situation that do not change the mutual inductor characteristic and do not affect legacy data collection, increase a high-speed data acquisition unit, gather the data of Rogowski coil simultaneously, in the situation that accomplish that two acquisition modules are independent of each other, can either guarantee the output of low-frequency signals, also can meet the collection of traveling wave fault signal.
Travelling wave ranging mainly contains following 4 points for the technical requirement of electronic mutual inductor:
1) provide the above sampled signal of 500KHZ;
2) the sampled signal bandwidth is more than 100KHZ;
3) sampling precision is not less than 12;
4) reliable with the traveling wave ranging device communication.
For above requirement, in the digital transformer substation transformation, in order to gather the data of Rogowski coil, for existing electronic mutual inductor collector, done following change:
1) increase hardware integral element in collector and carry out signal condition, and select the required operational amplifier of integrating circuit, to meet the requirement of bandwidth and response speed;
2) select the A/D chip of high sampling rate in collector;
3) select the corresponding MCU that controls the high-speed a/d chip.
At existing guard signal, export under constant prerequisite, the road increased in addition is applicable to the signal output of traveling wave fault location, and its sampling preferably is not less than 1MHz.The signal that the special module output sampling frequency rate increased is 500KHz in Luo-coil type electronic current mutual inductor, because this frequency still is less than 1MHz, therefore need to be further processed this signal, with reliability and the precision that meets traveling wave fault location.
The processing of traveling wave fault information and distance measurement function are realized
The signal gathered from electronic current mutual inductor, by optical fiber line of input ripple fault location device.What be different from traveling wave ranging device collection in normal station is simulating signal, what now from electronic mutual inductor, gather is digital signal, therefore, for the signal input module of original fault location device, also to change the digital signal load module that is applicable to electronic mutual inductor into.
In order to guarantee Range finding reliability, the traveling wave fault location device is sent in the Information Monitoring of electronic mutual inductor institute in real time, but only when fault being detected, just traveling wave ranging device starts.In order to realize the both-end distance measuring function, the same with the device in normal station, traveling wave ranging device needs synchronizing signal turn-on time.
Restriction due to the collection signal frequency, therefore need to do the processing that is different from normal station to the traveling wave fault signal, so that final data, with traveling wave fault location data in conventional substation, to realize both-end distance measuring and single end distance measurement analytic function, guarantees distance accuracy simultaneously.
Above-described embodiment of the present invention, do not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection domain of the present invention.
Claims (3)
1. the travelling wave ranging system based on electronic mutual inductor, comprise electronic current mutual inductor, low frequency signal Acquisition Circuit and secondary treating circuit; Described electronic current mutual inductor comprises annular air core coil, described annular air core coil is connected with the secondary treating circuit by the low frequency signal Acquisition Circuit, it is characterized in that: also comprise travelling wave signal high speed acquisition circuit, travelling wave signal merge cells, travelling wave signal processing unit and 61850 standard row wave datum transmission units; The annular air core coil of described electronic current mutual inductor is connected with travelling wave signal high speed acquisition circuit, travelling wave signal merge cells, travelling wave signal processing unit and 61850 standard row wave datum transmission units successively and exports travelling wave signal.
2. the travelling wave ranging system based on electronic mutual inductor according to claim 1 is characterized in that: described annular air core coil is Rogowski annular air core coil.
3. the travelling wave ranging system based on electronic mutual inductor according to claim 1, it is characterized in that: the travelling wave signal of described output is not less than 1MHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310337830.9A CN103487721A (en) | 2013-08-05 | 2013-08-05 | Traveling wave distance measuring system based on electronic transformer |
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| CN201310337830.9A CN103487721A (en) | 2013-08-05 | 2013-08-05 | Traveling wave distance measuring system based on electronic transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375018A (en) * | 2014-07-11 | 2015-02-25 | 国家电网公司 | Method for applying traveling wave fault location technology to electronic transformer intelligent transformer substation |
| CN104515932A (en) * | 2014-12-03 | 2015-04-15 | 许继电气股份有限公司 | Rapid line current fault detection method and rapid line current fault detection device |
| CN108983036A (en) * | 2017-06-05 | 2018-12-11 | 许继集团有限公司 | A kind of travelling wave ranging system based on electronic mutual inductor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203490323U (en) * | 2013-08-05 | 2014-03-19 | 国网安徽省电力公司铜陵供电公司 | Electronic transformer-based travelling wave fault location system |
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- 2013-08-05 CN CN201310337830.9A patent/CN103487721A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203490323U (en) * | 2013-08-05 | 2014-03-19 | 国网安徽省电力公司铜陵供电公司 | Electronic transformer-based travelling wave fault location system |
Non-Patent Citations (1)
| Title |
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| 周裕龙等: "新型行波故障测距装置在智能变电站中的应用", 《江西电力》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375018A (en) * | 2014-07-11 | 2015-02-25 | 国家电网公司 | Method for applying traveling wave fault location technology to electronic transformer intelligent transformer substation |
| CN104515932A (en) * | 2014-12-03 | 2015-04-15 | 许继电气股份有限公司 | Rapid line current fault detection method and rapid line current fault detection device |
| CN108983036A (en) * | 2017-06-05 | 2018-12-11 | 许继集团有限公司 | A kind of travelling wave ranging system based on electronic mutual inductor |
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Application publication date: 20140101 |