CN204439784U - A kind of voltage traveling wave sensor - Google Patents
A kind of voltage traveling wave sensor Download PDFInfo
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- CN204439784U CN204439784U CN201520165367.9U CN201520165367U CN204439784U CN 204439784 U CN204439784 U CN 204439784U CN 201520165367 U CN201520165367 U CN 201520165367U CN 204439784 U CN204439784 U CN 204439784U
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Abstract
The utility model discloses a kind of voltage traveling wave sensor, comprise the cylindrical shell of base, connecting portion and the hollow connected successively, CVT ground wire, TYD ground wire or transformer core grounding line pass in the middle of cylindrical shell, the signal processing circuit being provided with traveling wave sensor body in cylindrical shell and being connected with traveling wave sensor body secondary side, the output terminal of signal processing circuit connects the input end of wavefront testing circuit.Can when with primary side circuit without when directly be electrically connected, directly gather the travelling wave signal of primary equipment ground wire, and the hardware-initiated signal of real-time output row ripple effectively carries out wave head identification to wavefront testing circuit.
Description
Technical field
The utility model relates to a kind of sensor, particularly relates to a kind of voltage traveling wave sensor.
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.
Traditional travelling wave ranging all realizes by gathering CT secondary side signal, and its sample frequency is generally not less than 1MHz.Electronic mutual inductor provides necessary sample information for protection and measure and control device, and its sampling rate, generally lower than 10kHz, far can not meet the demand of traditional travelling wave ranging.
Utility model content
The purpose of this utility model is to provide a kind of voltage traveling wave sensor, can when with primary side circuit without when being directly electrically connected, the travelling wave signal of direct collection primary equipment ground wire, and the real-time hardware-initiated signal of row ripple that effectively exports carries out wave head identification to wavefront testing circuit.
The utility model adopts following technical proposals:
A kind of voltage traveling wave sensor, comprise the cylindrical shell of base, connecting portion and the hollow connected successively, CVT ground wire, TYD ground wire or transformer core grounding line pass in the middle of cylindrical shell, the signal processing circuit being provided with traveling wave sensor body in cylindrical shell and being 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 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.
Also comprise hood type fixed support or flat fixed support, described hood type fixed support comprises the curved splint and horizontal clamping plate that are bolted, be arc in the middle part of curved splint and two ends for dull and stereotyped, the middle part of horizontal clamping plate is provided with sensor installing plate; Flat fixed support comprises sensor installing plate, and the bottom surface of sensor installing plate is provided with supporting leg.
Traveling wave sensor body in the utility model has desirable bandpass filter amplitude-frequency, phase-frequency characteristic and transient characterisitics, can realize the requirement of electric current, the detection of voltage steady-state quantity, and the advantage that the time delay detected is very little; 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 the structural representation of voltage traveling wave sensor in the utility model;
Fig. 2 is the schematic diagram of voltage traveling wave sensor in the utility model;
Fig. 3 is the theory diagram of row ripple negative pole wave head testing circuit;
Fig. 4 is using state schematic diagram of the present utility model.
Embodiment
As shown in Figures 1 to 4, voltage traveling wave sensor described in the utility model, comprise the cylindrical shell 8 of base 6, connecting portion and the hollow connected successively, CVT ground wire, TYD ground wire or transformer core grounding line 5 pass in the middle of cylindrical shell 8, the signal processing circuit being provided with traveling wave sensor body 1 in cylindrical shell 8 and being connected with traveling wave sensor body 1 secondary side, the output terminal of signal processing circuit connects the input end of wavefront testing circuit;
The annular core that traveling wave sensor body 1 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 1.In the present embodiment, annular core is iron cobalt nickel alloy annular core, and the coil be wound on annular core 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 1 forms current measurement device that is similar and Rogowski coil, has desirable bandpass filter amplitude-frequency, phase-frequency characteristic and transient characterisitics.Traveling wave sensor body 1 is when pulsed current measurement, measured signal is restricted hardly, traveling wave sensor body 1 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, the requirement of electric current, the detection of voltage steady-state quantity can be realized, and the advantage that the time delay detected 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 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 utility model, 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 bleeder circuit in the utility model, voltage signal is reduced to the level level required by wavefront testing circuit.
In the present embodiment, protection circuit lightning protection circuit comprises the first resistance R1 and the lightning arrester 2 in parallel with the first resistance R1.The secondary side of traveling wave sensor body 1 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-0.3V, 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, 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.
For the ease of installing, the utility model also comprises hood type fixed support or flat fixed support, and described hood type fixed support comprises the curved splint and horizontal clamping plate that are bolted.Be arc in the middle part of curved splint and two ends for dull and stereotyped, the middle part of horizontal clamping plate is provided with sensor installing plate.When using hood type fixed support, curved splint and horizontal clamping plate first can be utilized to be fixed on cylinder by hood type fixed support, then voltage traveling wave sensor to be fixed on sensor installing plate.Flat fixed support comprises sensor installing plate, and the bottom surface of sensor installing plate is provided with supporting leg.When using flat fixed support, directly voltage traveling wave sensor is fixed on sensor installing plate.
Voltage traveling wave sensor described in the utility model in use, directly be set in CVT ground wire, on TYD ground wire or transformer core grounding line 5, when circuit normally runs, the electric current flowing to ground wire is very little, the output voltage being reflected in traveling wave sensor body 1 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 1 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 1 is arranged on trap in the utility model.
Claims (8)
1. a voltage traveling wave sensor, it is characterized in that: the cylindrical shell comprising base, connecting portion and the hollow connected successively, CVT ground wire, TYD ground wire or transformer core grounding line pass in the middle of cylindrical shell, the signal processing circuit being provided with traveling wave sensor body in cylindrical shell and being 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 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. voltage traveling wave sensor 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. voltage traveling wave sensor according to claim 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. voltage traveling wave sensor 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. voltage traveling wave sensor 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. voltage traveling wave sensor according to claim 5, is characterized in that: described annular core is iron cobalt nickel alloy annular core.
7. voltage traveling wave sensor according to claim 6, is characterized in that: before described traveling wave sensor body is arranged on trap.
8. voltage traveling wave sensor according to claim 7, it is characterized in that: also comprise hood type fixed support or flat fixed support, described hood type fixed support comprises the curved splint and horizontal clamping plate that are bolted, be arc in the middle part of curved splint and two ends for dull and stereotyped, the middle part of horizontal clamping plate is provided with sensor installing plate; Flat fixed support comprises sensor installing plate, and the bottom surface of sensor installing plate is provided with supporting leg.
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| CN201520165367.9U CN204439784U (en) | 2015-03-24 | 2015-03-24 | A kind of voltage traveling wave sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730419A (en) * | 2015-03-24 | 2015-06-24 | 国网河南省电力公司电力科学研究院 | Voltage traveling-wave sensor and installation and use method |
| US10969409B2 (en) | 2018-12-28 | 2021-04-06 | General Electric Company | Miniaturized current sensors |
| US11187727B2 (en) | 2019-04-29 | 2021-11-30 | Schweitzer Engineering Laboratories, Inc. | Capacitance-coupled voltage transformer monitoring |
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2015
- 2015-03-24 CN CN201520165367.9U patent/CN204439784U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730419A (en) * | 2015-03-24 | 2015-06-24 | 国网河南省电力公司电力科学研究院 | Voltage traveling-wave sensor and installation and use method |
| US10969409B2 (en) | 2018-12-28 | 2021-04-06 | General Electric Company | Miniaturized current sensors |
| US11187727B2 (en) | 2019-04-29 | 2021-11-30 | Schweitzer Engineering Laboratories, Inc. | Capacitance-coupled voltage transformer monitoring |
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