CN104730418A - Travelling wave sensing device for measuring voltage travelling waves - Google Patents
Travelling wave sensing device for measuring voltage travelling waves Download PDFInfo
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- CN104730418A CN104730418A CN201510128292.1A CN201510128292A CN104730418A CN 104730418 A CN104730418 A CN 104730418A CN 201510128292 A CN201510128292 A CN 201510128292A CN 104730418 A CN104730418 A CN 104730418A
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Abstract
The invention discloses a travelling wave sensing device for measuring voltage travelling waves. The travelling wave sensing device comprises a travelling wave sensor body and a signal processing circuit connected with the secondary side of the travelling wave sensor body, wherein the output end of the signal processing circuit is connected with the input end of a travelling wave head detection circuit. The travelling wave sensor body of the travelling wave sensing device has ideal amplitude-frequency, phase-frequency and transient characteristics of a band-pass filter, can meet the requirement for current and voltage steady state quantity detection and has the advantage that detected time delay is very small. The signal processing circuit directly identifies travelling wave heads, detects the polarity of the travelling wave heads and records the arrival moment of the travelling wave heads through a hardware circuit and performs protection and fault positioning, and protection accuracy and speed can be improved.
Description
Technical field
The present invention relates to a kind of sensing device, particularly relate to a kind of row ripple sensing device of measuring voltage row ripple.
Background technology
China's electric utility just vigorously develops rapidly, and long distance high-voltage or extra high voltage network are exposed to wilderness, and mostly is mountain area undulating topography in China, and the weather such as heavy rain, lightning reason and human factor usually make line failure.Trouble spot quick, accurately locate, it is the difficult problem that power department not yet thoroughly solves always, larger threat is formed to the safety of electric system, high-quality, economical operation, brings heavy burden also to circuit operation maintenance personnel, bring incalculable damage to especially electricity consumption department.After transmission line malfunction, the localization of faults is quickly and accurately the gordian technique ensureing power network safety operation, is also one of main bugbear of long-standing problem operation of power networks.Conventional power transmission line fault locating method mainly contains impedance method and traveling wave method and voltage's distribiuting method, and impedance method, due to the defect in principle, is difficult to ensure positioning precision; Voltage's distribiuting method, due to the impact by transition resistance and line parameter circuit value, is also difficult to the precision ensureing range measurement; Along with the continuous progress of computing machine, communication and measuring technique, traveling wave method obtains and develops rapidly, and progressively enters practical stage.
Summary of the invention
The object of this invention is to provide a kind of row ripple sensing device of measuring voltage row ripple, when can be tested primary system without direct electrical connection, by hardware circuit identification wavefront, and coordinate row ripple recording device records wavefront time of arrival.
The present invention adopts following technical proposals:
A row ripple sensing device for measuring voltage row ripple, the signal processing circuit comprising traveling wave sensor body and be connected with traveling wave sensor body secondary side, the output terminal of signal processing circuit connects the input end of wavefront testing circuit;
The annular core that described traveling wave sensor body comprises sectional uniform and the coil be wound on annular core, coil winding becomes even level and the coiling direction of adjacent two layers coil is contrary, the secondary side connection signal treatment circuit of traveling wave sensor body;
Described signal processing circuit comprises protection circuit lightning protection circuit in parallel and overvoltage suppression circuit, and the two ends of overvoltage suppression circuit circuit are parallel with bleeder circuit, and the output terminal of bleeder circuit connects the input end of wavefront testing circuit;
Described wavefront testing circuit comprises row ripple positive pole wave head testing circuit and row ripple negative pole wave head testing circuit; Row ripple positive pole wave head testing circuit comprises positive rate of change comparer and positive peak comparer; The definite value end of positive rate of change comparer connects positive rate of change level and to adjust the output terminal of module, the comparison end of positive rate of change comparer connects the output terminal of bleeder circuit by differentiating circuit, the output terminal of positive rate of change comparer connects the comparison end of reverse countdown comparer, and the definite value end of reverse countdown comparer connects the retention time and to adjust the output terminal of module; The output terminal of reverse countdown comparer connects the first input end of first and door; The comparison end of positive peak comparer connects the output terminal of bleeder circuit, and the definite value end of positive peak comparer connects positive peak level and to adjust the output terminal of module, the output terminal of positive peak comparer connect first with the second input end of door; First with the electrode input end of the output terminal connected row ripple pen recorder of door;
Row ripple negative pole wave head testing circuit comprises negative rate of change comparer and negative peak comparer; The definite value end of negative rate of change comparer connects negative rate of change level and to adjust the output terminal of module, the comparison end of negative rate of change comparer connects the output terminal of bleeder circuit by differentiating circuit, the output terminal of negative rate of change comparer connects the comparison end of negative timing comparer, and the definite value end of negative timing comparer connects the retention time and to adjust the output terminal of module; The output terminal of negative timing comparer connects the first input end of second and door; The comparison end of negative peak comparer connects the output terminal of bleeder circuit, and the definite value end of negative peak comparer connects negative peak level and to adjust the output terminal of module, the output terminal of negative peak comparer connect second with the second input end of door; Second with the negative input of the output terminal connected row ripple pen recorder of door.
Described protection circuit lightning protection circuit comprises the first resistance and the lightning arrester with the first resistor coupled in parallel.
The secondary side of described traveling wave sensor body also connects overvoltage suppression circuit by the first double shielded coaxial cable, described overvoltage suppression circuit comprises the series circuit formed by the first transient voltage suppressor diode and the second transient voltage suppressor diode, and the negative pole of the first transient voltage suppressor diode connects the negative pole of the second transient voltage suppressor diode.
Described bleeder circuit comprises the second resistance and the 3rd resistance of series connection, the first end of the second resistance connects the positive pole of the first transient voltage suppressor diode, second end of the second resistance connects the first end of the 3rd resistance, and the second end of the 3rd resistance connects the positive pole of the second transient voltage suppressor diode; Second end of the second resistance connects the input end of wavefront testing circuit by the second double shielded coaxial cable.
The described coil be wound on annular core is 12 circle to 20 circles, and the coil number of plies is 2 layers.
Described annular core is iron cobalt nickel alloy annular core.
Before described traveling wave sensor body is arranged on trap.
In the present invention, traveling wave sensor body has desirable bandpass filter amplitude-frequency, phase-frequency characteristic and transient characterisitics, can realize electric current, requirement that voltage steady-state quantity detects, and has the very little advantage of the time delay that detects; Signal processing circuit directly by hardware circuit identification wavefront, detection wavefront polarity, and records wavefront due in, carries out protecting and localization of fault, can improve precision and the speed of protection.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the theory diagram of row ripple negative pole wave head testing circuit;
Fig. 3 is use principle schematic diagram of the present invention.
Embodiment
As shown in Figure 1 to Figure 3, the row ripple sensing device of measuring voltage row ripple of the present invention, the signal processing circuit comprising traveling wave sensor body and be connected with traveling wave sensor body secondary side, the output terminal of signal processing circuit connects the input end of wavefront testing circuit.
The annular core 1 that traveling wave sensor body comprises sectional uniform and the coil be wound on annular core 1, coil winding becomes even level and the coiling direction of adjacent two layers coil is contrary, the secondary side connection signal treatment circuit of traveling wave sensor body.In the present embodiment, annular core 1 is iron cobalt nickel alloy annular core 1, and the coil be wound on annular core 1 is 12 circle to 20 circles, and the coil number of plies is 2 layers, and the design that the coil number of plies is even number can eliminate the magnetic linkage impact of large coil institute interlinkage.
Traveling wave sensor body forms the current measurement device being similar to Rogowski coil, has desirable bandpass filter amplitude-frequency, phase-frequency characteristic and transient characterisitics.Traveling wave sensor body is when pulsed current measurement, measured signal is restricted hardly, traveling wave sensor body all can not be saturated in any case, the electric current that the rise time is nanosecond can be measured, and be electrically connected without direct with primary side circuit, electric current can be realized, requirement that voltage steady-state quantity detects, there is the advantage that the time delay that detects is very little.
Signal processing circuit comprises protection circuit lightning protection circuit in parallel and overvoltage suppression circuit, and the two ends of overvoltage suppression circuit circuit are parallel with bleeder circuit, and the output terminal of bleeder circuit connects the input end of wavefront testing circuit.Because electric system is when breaking down, overvoltage may be had to produce, in order to protect row ripple locating device, avoiding overvoltage signal to scurry into, in the present invention, using overvoltage suppression circuit to play the effect of voltage clamp.Due to the feature of high-frequency signal transmission, require to consider the resistance of bleeder circuit and the resistance matching problem of signal cable, reflect at cable and sensor tie-point to avoid high-frequency signal, reach the object reducing signal to noise ratio (S/N ratio), also use in the present invention and have bleeder circuit, voltage signal is reduced to the level level required by wavefront testing circuit.
In the present embodiment, protection circuit lightning protection circuit comprises and the first resistance R1 and the lightning arrester 2 in parallel with the first resistance R1.The secondary side of traveling wave sensor body also connects overvoltage suppression circuit by the first double shielded coaxial cable 3, described overvoltage suppression circuit comprises the series circuit formed by the first transient voltage suppressor diode D1 and the second transient voltage suppressor diode D2, and the negative pole of the first transient voltage suppressor diode D1 connects the negative pole of the second transient voltage suppressor diode D2.Bleeder circuit comprises the second resistance R2 and the 3rd resistance R3 of series connection, the first end of the second resistance R2 connects the positive pole of the first transient voltage suppressor diode D1, second end of the second resistance R2 connects the first end of the 3rd resistance R3, and second end of the 3rd resistance R3 connects the positive pole of the second transient voltage suppressor diode D2; Second end of the second resistance R2 connects the input end of wavefront testing circuit by the second double shielded coaxial cable 4.
Wavefront testing circuit for identifying wavefront, and sends a signal to interocclusal record when row ripple pen recorder drives it to carry out.Row ripple pen recorder is existing apparatus, does not repeat them here.Wavefront testing circuit comprises row ripple positive pole wave head testing circuit and row ripple negative pole wave head testing circuit; Row ripple positive pole wave head testing circuit comprises positive rate of change comparer and positive peak comparer; The definite value end of positive rate of change comparer connects positive rate of change level and to adjust the output terminal of module, be generally 0.3V, the comparison end of positive rate of change comparer connects the output terminal of bleeder circuit by differentiating circuit, the output terminal of positive rate of change comparer connects the comparison end of reverse countdown comparer, the definite value end of reverse countdown comparer connects the retention time and to adjust the output terminal of module, is generally 10 μ S; The output terminal of reverse countdown comparer connects the first input end of first and door; The comparison end of positive peak comparer connects the output terminal of bleeder circuit, and the definite value end of positive peak comparer connects positive peak level and to adjust the output terminal of module, is generally 1V, the output terminal of positive peak comparer connect first with the second input end of door; First with the electrode input end of the output terminal connected row ripple pen recorder of door; For the capable ripple of positive pole, when row ripple rate of change produces trigger pip higher than during 0.3V, if produce the wavefront being greater than 1V in 10 μ S, be then defined as fault traveling wave, and output signal with door by first.
Row ripple negative pole wave head testing circuit comprises negative rate of change comparer and negative peak comparer; The definite value end of negative rate of change comparer connects negative rate of change level and to adjust the output terminal of module, be generally the output terminal of comparison end by differentiating circuit connection bleeder circuit that-0.3V bears rate of change comparer, the output terminal of negative rate of change comparer connects the comparison end of negative timing comparer, the definite value end of negative timing comparer connects the retention time and to adjust the output terminal of module, is generally 10 μ S; The output terminal of negative timing comparer connects the first input end of second and door; The comparison end of negative peak comparer connects the output terminal of bleeder circuit, and the definite value end of negative peak comparer connects negative peak level and to adjust the output terminal of module, is generally 1V, the output terminal of negative peak comparer connect second with the second input end of door; Second with the negative input of the output terminal connected row ripple pen recorder of door.For the capable ripple of negative pole, when row ripple rate of change produces trigger pip lower than during-0.3V, if produce the wavefront being less than-1V in 10 μ S, be then defined as fault traveling wave, and output signal with door by second.
The present invention in use, directly be set on the ground wire 5 of CVT or coupling condenser, when circuit normally runs, the electric current flowing to ground wire is very little, the output voltage being reflected in traveling wave sensor body is zero substantially: when line failure, fault traveling wave enters from circuit, due to the operation voltage of lightning arrester 22 low (2kV ~ 4kV), fast response time, when wavefront arrives, lightning arrester 21 or lightning arrester 22 action, voltage will be produced between AB, depending on fault type, the difference of fault moment and transition resistance, the skip signal rising fast or decline of 40V ~ 100V will be produced between AB, the transient state Transfer characteristic that traveling wave sensor body utilizes magnetic potentiometer good by its verily progress of disease to signal processing circuit and wavefront testing circuit, as the detection signal of wavefront, really record is carried out for fault traveling wave by this skip signal start line ripple pen recorder when wavefront testing circuit detects.In order to eliminate level and smooth to wavefront of trap and bus capacitor, ensure that row ripple sensing device has the enough little rise time, before traveling wave sensor body is arranged on trap in the present invention.
In the present invention, traveling wave sensor body has desirable bandpass filter amplitude-frequency, phase-frequency characteristic and transient characterisitics, can realize electric current, requirement that voltage steady-state quantity detects, and has the very little advantage of the time delay that detects; Signal processing circuit directly by hardware circuit identification wavefront, detection wavefront polarity, and records wavefront due in, carries out protecting and localization of fault, can improve precision and the speed of protection.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. a row ripple sensing device for measuring voltage row ripple, is characterized in that: the signal processing circuit comprising traveling wave sensor body and be connected with traveling wave sensor body secondary side, and the output terminal of signal processing circuit connects the input end of wavefront testing circuit;
The annular core that described traveling wave sensor body comprises sectional uniform and the coil be wound on annular core, coil winding becomes even level and the coiling direction of adjacent two layers coil is contrary, the secondary side connection signal treatment circuit of traveling wave sensor body;
Described signal processing circuit comprises protection circuit lightning protection circuit in parallel and overvoltage suppression circuit, and the two ends of overvoltage suppression circuit circuit are parallel with bleeder circuit, and the output terminal of bleeder circuit connects the input end of wavefront testing circuit;
Described wavefront testing circuit comprises row ripple positive pole wave head testing circuit and row ripple negative pole wave head testing circuit; Row ripple positive pole wave head testing circuit comprises positive rate of change comparer and positive peak comparer; The definite value end of positive rate of change comparer connects positive rate of change level and to adjust the output terminal of module, the comparison end of positive rate of change comparer connects the output terminal of bleeder circuit by differentiating circuit, the output terminal of positive rate of change comparer connects the comparison end of reverse countdown comparer, and the definite value end of reverse countdown comparer connects the retention time and to adjust the output terminal of module; The output terminal of reverse countdown comparer connects the first input end of first and door; The comparison end of positive peak comparer connects the output terminal of bleeder circuit, and the definite value end of positive peak comparer connects positive peak level and to adjust the output terminal of module, the output terminal of positive peak comparer connect first with the second input end of door; First with the electrode input end of the output terminal connected row ripple pen recorder of door;
Row ripple negative pole wave head testing circuit comprises negative rate of change comparer and negative peak comparer; The definite value end of negative rate of change comparer connects negative rate of change level and to adjust the output terminal of module, the comparison end of negative rate of change comparer connects the output terminal of bleeder circuit by differentiating circuit, the output terminal of negative rate of change comparer connects the comparison end of negative timing comparer, and the definite value end of negative timing comparer connects the retention time and to adjust the output terminal of module; The output terminal of negative timing comparer connects the first input end of second and door; The comparison end of negative peak comparer connects the output terminal of bleeder circuit, and the definite value end of negative peak comparer connects negative peak level and to adjust the output terminal of module, the output terminal of negative peak comparer connect second with the second input end of door; Second with the negative input of the output terminal connected row ripple pen recorder of door.
2. the row ripple sensing device of measuring voltage row ripple according to claim 1, is characterized in that: described protection circuit lightning protection circuit comprises the first resistance and the lightning arrester with the first resistor coupled in parallel.
3. the row ripple sensing device of measuring voltage row ripple according to claim 1 and 2, it is characterized in that: the secondary side of described traveling wave sensor body also connects overvoltage suppression circuit by the first double shielded coaxial cable, described overvoltage suppression circuit comprises the series circuit formed by the first transient voltage suppressor diode and the second transient voltage suppressor diode, and the negative pole of the first transient voltage suppressor diode connects the negative pole of the second transient voltage suppressor diode.
4. the row ripple sensing device of measuring voltage row ripple according to claim 3, it is characterized in that: described bleeder circuit comprises the second resistance and the 3rd resistance of series connection, the first end of the second resistance connects the positive pole of the first transient voltage suppressor diode, second end of the second resistance connects the first end of the 3rd resistance, and the second end of the 3rd resistance connects the positive pole of the second transient voltage suppressor diode; Second end of the second resistance connects the input end of wavefront testing circuit by the second double shielded coaxial cable.
5. the row ripple sensing device of measuring voltage row ripple according to claim 4, is characterized in that: the described coil be wound on annular core is 12 circle to 20 circles, and the coil number of plies is 2 layers.
6. the row ripple sensing device of measuring voltage row ripple according to claim 5, is characterized in that: described annular core is iron cobalt nickel alloy annular core.
7. the row ripple sensing device of measuring voltage row ripple according to claim 6, is characterized in that: before described traveling wave sensor body is arranged on trap.
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| CN201510128292.1A CN104730418A (en) | 2015-03-24 | 2015-03-24 | Travelling wave sensing device for measuring voltage travelling waves |
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| CN201510128292.1A CN104730418A (en) | 2015-03-24 | 2015-03-24 | Travelling wave sensing device for measuring voltage travelling waves |
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Cited By (1)
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| CN105448498A (en) * | 2015-12-07 | 2016-03-30 | 深圳供电局有限公司 | Traveling wave sensor and coil winding method for magnetic core for traveling wave sensor |
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Application publication date: 20150624 |