CN106526421A - Method for adding current traveling wave signal acquisition to transmission line matching device - Google Patents
Method for adding current traveling wave signal acquisition to transmission line matching device Download PDFInfo
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- CN106526421A CN106526421A CN201610984550.0A CN201610984550A CN106526421A CN 106526421 A CN106526421 A CN 106526421A CN 201610984550 A CN201610984550 A CN 201610984550A CN 106526421 A CN106526421 A CN 106526421A
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- Prior art keywords
- transmission line
- traveling wave
- electricity
- wave signal
- corollary apparatus
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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
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- General Physics & Mathematics (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a method for adding current traveling wave signal acquisition to a transmission line matching device. On the basis of the software and hardware of a conventional power transmission line support device, the external hardware interface of the device is maintained to be unchanged, a signal amplifying circuit is added to a current transformer secondary side in the device to realize traveling wave signal amplification, and the amplified traveling wave signal is outputted to a newly added traveling wave DSP plug-in through a device backplane to carry out traveling wave signal collection. The full ranges of a traveling wave signal amplification circuit and a traveling wave DSP plug-in collection circuit are designed according to a four-time overload capacity, and a signal which exceeds a full range is subjected to amplitude limiting. The method can be applied to a transmission line matching device of conventional sampling such as a transmission line protection device and a fault recording device, a traveling wave signal acquisition function can be conveniently, reliably and effectively added, and the signal noise ratio and resolution of the traveling wave signal can be effectively improved.
Description
Technical field
The present invention relates to electric network protection and automatic technology, more particularly to one kind increases row on transmission line of electricity corollary apparatus
The technology of ripple signals collecting.
Background technology
Current power transmission line protective devices and fault wave recording device carry out fault localization using impedance methodologies, and the method is easy
Affected by system operation mode, transition resistance, attenuating dc component and measurement error, it is difficult to realize that accurate failure is fixed
Position.A kind of effective way for improving line fault range accuracy is to increase current traveling wave range finding work(in transmission line of electricity corollary apparatus
Can, so that monitored circuit realizes both-end traveling wave fault location and single-ended traveling wave fault location.But current conventional power transmission line
Road corollary apparatus, such as line protection, fault wave recording device, measure and control device etc., only have power frequency component collection related
Module, not with travelling wave signal acquisition module and travelling wave ranging function.To increase electric current in the corollary apparatus of conventional electrical power lines road
Travelling wave signal acquisition module, need to meet some technical requirements, including：(1) the external communication signal input of holding meanss is needed to connect
Mouth is constant, and the complexity and load that can otherwise cause CT secondary circuits increases, while being also unfavorable for that having device to scene is carried out
Transformation；(2) addition of travelling wave signal acquisition circuit should not affect the reliability of former power frequency component acquisition circuit, can otherwise bring peace
Full hidden danger；(3) device need to keep the acquisition capacity of the power current to high overload multiple, so as to meet the need of relay protection function
Ask, be provided simultaneously with the acquisition capacity of the current traveling wave signal to relative amplitude very little, so as to meet the demand of travelling wave ranging function.
Conventional line protection and wave recording device typically press larger overload magnification (as 50 times specified at present
Electric current) design communication current signal dynamic range, and effectively the amplitude of travelling wave signal is generally within 4 times of scopes.If straight
Connect and travelling wave signal is provided using the original transformer of device, then the output amplitude meeting very little of travelling wave signal, the direct Jing of the small-signal
When device backboard is transferred to sampling DSP plug-in units, it is easy to by backboard effect of noise, and be difficult to and adopt because signal amplitude is little
The input range matching in sample loop, causes the signal to noise ratio of travelling wave signal, resolution all relatively low, can badly influence travelling wave ranging
Precision.If not utilizing original transformer plug-in unit, but special traveling wave transformer is set up in transmission line of electricity corollary apparatus
Plug-in unit, the then external cabling of device need to change, and can increase complexity and the load of CT secondary circuits, engineering adaptability and reliability
Property can be substantially reduced.Accordingly, it would be desirable to study conveniently, reliably and efficiently increase current traveling wave letter in transmission line of electricity corollary apparatus
Number collection method.
The content of the invention
The technical problem to be solved is：Research one kind is convenient on transmission line of electricity corollary apparatus, reliable, effective
The method that ground increases current traveling wave signals collecting, it is to avoid traveling wave acquisition circuit has influence on the external communication input interface of device, keeps away
Exempting from traveling wave acquisition circuit increases complexity and the load in scene CT loops, it is to avoid traveling wave acquisition circuit has influence on original power frequency component
The reliability of acquisition circuit, it is to avoid travelling wave signal is because the little and caused signal to noise ratio of amplitude is low, sampling resolution is low.
In order to reach above-mentioned purpose, the invention provides one kind increases current traveling wave signal on transmission line of electricity corollary apparatus
The method of collection, the method are to increase travelling wave signal in the Current Transformer Secondary side of the original exchange input plug-in unit of device to amplify electricity
Road, the amplified output of travelling wave signal to device backboard, device are set up high speed traveling wave and gather DSP plug-in units from backboard acquirement traveling wave letter
Number it is acquired, travelling wave signal loop and traveling wave DSP plug-in unit adopt identical range ability, the signal of no to scale scope to be expert at
Ripple signal amplification circuit will be limited.
The technical scheme is that what is be achieved in that：
A kind of method that transmission line of electricity corollary apparatus increase current traveling wave signals collecting, is applied to the power transmission line of routine sampling
In the corollary apparatus of road, the external hardware of transmission line of electricity corollary apparatus on the basis of conventional transmission line of electricity corollary apparatus, is kept
Interface is constant, and the Current Transformer Secondary side increase travelling wave signal amplifying circuit in transmission line of electricity corollary apparatus realizes electric current row
Ripple signal amplifies, and increases traveling wave DSP plug-in unit and sample for travelling wave signal in transmission line of electricity corollary apparatus.
Used as present invention further optimization scheme, travelling wave signal amplifying circuit is located at the exchange of transmission line of electricity corollary apparatus
In input plug-in unit, the travelling wave signal output after amplification to transmission line of electricity corollary apparatus backboard, traveling wave DSP plug-in unit are matched somebody with somebody from transmission line of electricity
The backboard collection travelling wave signal of covering device.
Used as present invention further optimization scheme, travelling wave signal amplifying circuit and traveling wave DSP plug-in unit Acquisition Circuit press k times
Overload capacity design full scale, k value is according to rated voltage Un of transmission line of electricity, rated current In and electric transmission line positive sequence wave resistance
Anti- Z determines that m traveling wave Downward addition is without departing from range ability, k=m*Un/ (Z*In) in phase-to phase fault.
Used as present invention further optimization scheme, signal amplification circuit includes amplitude limit function, beyond k times of travelling wave signal
To be limited in signal amplification circuit.
Used as present invention further optimization scheme, the transmission line of electricity corollary apparatus of the routine sampling include transmission line of electricity
Protection device, fault wave recording device.The invention has the beneficial effects as follows：Can be square in transmission line of electricity corollary apparatus using the present invention
Just, reliably and efficiently increase current traveling wave Signals collecting function.The external communication input interface of transmission line of electricity corollary apparatus need not
Change, advantageously reduces live CT secondary circuits complexity, is conducive to the field device of line protection to transform and new equipment
Installation and operation.The collection of travelling wave signal does not affect the reliability and certainty of measurement of former power frequency component collection, and transmission line of electricity is with suit
Put the collection energy of the acquisition capacity and travelling wave signal to relative amplitude very little for being provided simultaneously with the power current to high overload multiple
Power, travelling wave signal have big amplitude and signal to noise ratio, are conducive to improving the precision of travelling wave ranging.
Description of the drawings
Fig. 1 is the line protection application scenarios schematic diagram for being integrated with travelling wave ranging function；
Amplification and collection schematic diagram of the Fig. 2 for current traveling wave signal.
Fig. 3 is the travelling wave signal amplifying circuit built using high frequency amplifier
Specific embodiment
Embodiments provide a kind of method for increasing travelling wave signal collection in transmission line of electricity corollary apparatus, the party
Method can be applicable to the transmission line of electricity corollary apparatus such as line protection, fault wave recording device.Traveling wave is integrated with by this method
The application scenarios of the line protection of distance measurement function are as shown in Figure 1.
The specific embodiment of the embodiment of the present invention is as follows：
On the basis of the software and hardware of conventional transmission line of electricity corollary apparatus, the external hardware interface of holding meanss is constant,
Transformer secondary side in device increases signal amplification circuit and realizes that travelling wave signal amplifies, and increases traveling wave DSP plug-in unit in a device
Sample for travelling wave signal.
Travelling wave signal amplifying circuit is located in the exchange input plug-in unit of device, and the travelling wave signal output after amplification is carried on the back to device
Plate, traveling wave DSP plug-in unit gather travelling wave signal from device backboard, as shown in Figure 2.
Travelling wave signal Design of Amplification Circuit is with k times of overload capacity, to improve the amplitude and signal to noise ratio of travelling wave signal.
Traveling wave amplifying circuit and traveling wave DSP plug-in unit press this k value matching design signal acquisition range.
K value determined according to rated voltage Un of transmission line of electricity, rated current In and electric transmission line positive sequence natural impedance Z, and will
M traveling wave Downward addition is sought in phase-to phase fault without departing from range ability.K=m*Un/ (Z*In).M=2 is taken so that signal is put
Front 2 wavefronts in big circuit and the correct faults waveform of acquisition circuit energy.1st wavefront is used for both-end traveling wave
Range finding, the 2nd wavefront are used for Single Terminal Traveling Wave Fault Location.
For 220kV～1000kV electric pressures, the specified phase current scopes of 1000A～4000A, transmission line of electricity natural impedance take
It is worth 300～500 ohm of scope, the representative value of k is：
The typical minima of k：K=2*220kV/ (300 Europe * 4000A)=0.367；
The typical maximum of k：K=2*1000kV/ (500 Europe * 1000A)=4.0.
Therefore, k can in the range of 0.367～4 value.For making device be applied to different transmission lines of electricity, k=4 is can use.
To be limited in signal amplification circuit beyond k times of signal, so as to protect acquisition circuit below.Amplitude limit can be adopted
Various ways, for example, realize nature amplitude limit by the power supply of signal amplification circuit because amplitude output signal not over
The power supply of signal amplification circuit；Or amplitude limit is carried out in signal output point shunt voltage protection device, for example with two pole of voltage stabilizing
Pipe, Transient Suppression Diode etc..Fig. 3 is the travelling wave signal amplifying circuit built using high frequency amplifier, and the circuit will by power supply
Signal output amplitude is restricted in the range of -10V～+10V.
The above, only presently preferred embodiments of the present invention is not intended to limit protection scope of the present invention.It is any
Those familiar with the art the present invention disclosure technical scope in, the change or replacement that can be readily occurred in, all
Should be included within the scope of the present invention.
Claims (5)
1. a kind of method that transmission line of electricity corollary apparatus increase current traveling wave signals collecting, is applied to the transmission line of electricity of routine sampling
In corollary apparatus, it is characterised in that：On the basis of conventional transmission line of electricity corollary apparatus, transmission line of electricity corollary apparatus are kept
Externally hardware interface is constant, and the Current Transformer Secondary side in transmission line of electricity corollary apparatus increases travelling wave signal amplifying circuit reality
Existing current traveling wave signal amplifies, and increases traveling wave DSP plug-in unit and sample for travelling wave signal in transmission line of electricity corollary apparatus.
2. the method that transmission line of electricity corollary apparatus according to claim 1 increase current traveling wave signals collecting, its feature exist
In：Travelling wave signal amplifying circuit is located in the exchange input plug-in unit of transmission line of electricity corollary apparatus, the travelling wave signal output after amplification
To transmission line of electricity corollary apparatus backboard, backboard collection travelling wave signal of the traveling wave DSP plug-in unit from transmission line of electricity corollary apparatus.
3. the method that transmission line of electricity corollary apparatus according to claim 1 increase current traveling wave signals collecting, its feature exist
In：Travelling wave signal amplifying circuit and traveling wave DSP plug-in unit Acquisition Circuit press k times of overload capacity design full scale, and k value is according to transmission of electricity
Rated voltage Un of circuit, rated current In and electric transmission line positive sequence natural impedance Z determine that m traveling wave is positive in phase-to phase fault
Superposition is without departing from range ability, k=m*Un/ (Z*In).
4. the method that transmission line of electricity corollary apparatus according to claim 1 increase current traveling wave signals collecting, its feature exist
In：Signal amplification circuit includes amplitude limit function, will be limited in signal amplification circuit beyond k times of travelling wave signal.
5. the method that transmission line of electricity corollary apparatus according to claim 1 increase current traveling wave signals collecting, its feature exist
In：The transmission line of electricity corollary apparatus of the routine sampling include line protection, fault wave recording device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610984550.0A CN106526421A (en) | 2016-11-09 | 2016-11-09 | Method for adding current traveling wave signal acquisition to transmission line matching device |
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| CN201610984550.0A CN106526421A (en) | 2016-11-09 | 2016-11-09 | Method for adding current traveling wave signal acquisition to transmission line matching device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247214A (en) * | 2017-06-30 | 2017-10-13 | 南京南瑞继保电气有限公司 | A kind of integrated line protection, travelling wave ranging method |
| CN107807308A (en) * | 2017-10-10 | 2018-03-16 | 南京南瑞继保电气有限公司 | A kind of transmission line travelling wave velocity of wave self-learning method and traveling wave ranging device |
| CN110109041A (en) * | 2019-06-03 | 2019-08-09 | 南方电网科学研究院有限责任公司 | Detection system and method of non-contact traveling wave distance measuring device |
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| CN105629127A (en) * | 2015-12-23 | 2016-06-01 | 南京国电南自电网自动化有限公司 | EHV line protection method with integration with traveling wave ranging function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107247214A (en) * | 2017-06-30 | 2017-10-13 | 南京南瑞继保电气有限公司 | A kind of integrated line protection, travelling wave ranging method |
| CN107247214B (en) * | 2017-06-30 | 2019-06-21 | 南京南瑞继保电气有限公司 | A kind of integrated line protection, travelling wave ranging method |
| CN107807308A (en) * | 2017-10-10 | 2018-03-16 | 南京南瑞继保电气有限公司 | A kind of transmission line travelling wave velocity of wave self-learning method and traveling wave ranging device |
| CN107807308B (en) * | 2017-10-10 | 2020-01-10 | 南京南瑞继保电气有限公司 | Transmission line traveling wave speed self-learning method and traveling wave distance measuring device |
| CN110109041A (en) * | 2019-06-03 | 2019-08-09 | 南方电网科学研究院有限责任公司 | Detection system and method of non-contact traveling wave distance measuring device |
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Application publication date: 20170322 |