CN203595743U - Current acquisition sensor used for lightning stoke tower - Google Patents
Current acquisition sensor used for lightning stoke tower Download PDFInfo
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- CN203595743U CN203595743U CN201320781286.2U CN201320781286U CN203595743U CN 203595743 U CN203595743 U CN 203595743U CN 201320781286 U CN201320781286 U CN 201320781286U CN 203595743 U CN203595743 U CN 203595743U
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- 238000005070 sampling Methods 0.000 claims abstract description 17
- 238000002955 isolation Methods 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 12
- 238000004088 simulation Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 241001354243 Corona Species 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 7
- 230000010354 integration Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a current acquisition sensor used for a lightning stoke tower. The sensor is installed on a tower (3), and comprises four Rogowski coils (1) and an integral circuit (2); the Rogowski coils (1) are parallel connected to a sampling resistor RJ; the integral circuit (2) is also parallelly connected to the sampling resistor RJ; and an isolation resistor is arranged on the output port of each of the Rogowski coils (1). The beneficial effects of the sensor are that the sensor is capable of acquiring multichannel current, and by use of the integral circuit, restoring the multichannel current to a big current wave form before the shunt; with no active devices required on the whole sensor, an d by use of a passive simulation superposition method, power consumption is greatly reduced; and three acquiring channels of the sensor are reduced, so the sensor is simple to arrange and low in implementation costs, produces strong current, and is not liable to produce coronas, highly safe and high in precision.
Description
Technical field
The utility model relates to current sensor, particularly relates to for the shaft tower on-line monitoring system current acquisition sensor that is struck by lightning.
Background technology
The monitoring of the large electric current of electric system is mainly adopted to shunt and Rogowski coil (Luo-coil).Wherein Luo-coil is to utilize Principle of Current Mutual Inductance to carry out the device that electric current is measured indirectly, has the good characteristics such as low-power output, simple in structure, linearity is good, and under many Super-Current Measurement occasions, it is all the first choice of senser element.
Because Luo-coil characteristic sensor is outstanding, be widely used, a lot of scholars have done research to it from different perspectives, comprise Luo-coil Analysis of Spectrum and influence factor thereof; For difference in functionality Luo-coil simulation calculation and experimental study; Distributed capacitance, the impact of the components and parts non-ideal characteristics such as stray inductance on Luo-coil overall performance; Different integral way application scenarios and feature; Pcb board Luo-coil feature and technique; The selection of Luo-coil principles of structural design and components and parts; Luo-coil is in the application in measurement of partial discharge field; Many aspects such as the impact of coiling material on Luo-coil performance, and set forth by scientific paper.In literary composition, analyze and study for single Luo-coil for general.Use four Luo-coils are in parallel, and rear characteristic in parallel etc., document is all also not mentioned.
In actual current monitoring and measuring application, Luo-coil sensor is generally arranged on the position that can directly measure large electric current.For example shaft tower lighting current sensor is arranged on insulator earth terminal, lightning conducter and shaft tower tie point; Transformer station's current sensor is arranged on insulation column earth terminal etc. and locates; These sensors are all used aloneds, have independent acquisition channels.And at some on a large scale,, there is the occasion of shunting situation in hyperchannel, often need to arrange multiple such coils to measure, gather.For example, while measuring thunderbolt shaft tower earth current, electric current enters ground by shaft tower pedestal, needs four Luo-coil sensors.
The method of the large current acquisition of hyperchannel has passage independence acquisition method and active signal method of superposition.The acquisition channel number of passage independence acquisition method is consistent with number of sensors, and number of channels is many, and memory capacity is large, and cost is high; Active signal method of superposition realizes the simulation stack of signal by the active device such as follower, totalizer, but the increase of active device quantity easily causes the increase of pick-up unit power consumption and failure rate, and the characteristic of active device also can have a huge impact signal stack.For this reason, a lot of measuring systems, in the time using Luo-coil sensor, avoid four Luo-coils jointly to measure the situation of total current as far as possible, and to evade the problem of active stack, this has just limited the installation site of Luo-coil, has improved installation difficulty.
Utility model content
The purpose of this utility model is to overcome the shortcoming and defect of above-mentioned prior art, and the shaft tower on-line monitoring system current acquisition sensor that is provided for being struck by lightning, solves in existing multi channel currents acquisition method, and cost is high, power consumption is large, troublesome defect.
The purpose of this utility model is achieved through the following technical solutions: for the shaft tower on-line monitoring system current acquisition sensor that is struck by lightning, be arranged on shaft tower, comprise integrating circuit and four Luo-coils, four Luo-coils are arranged on respectively on four pillars of shaft tower, corresponding Luo-coil place plane is perpendicular to corresponding pillar, and corresponding pillar is through the center of corresponding Luo-coil, and all Luo-coils are all parallel to a sampling resistor R
jupper, integrating circuit is also parallel to sampling resistor R
jupper, on the output port of described Luo-coil, be all provided with respectively an isolation resistance.This device is mainly used in gathering ground current, is connected on the integrating circuit of coupling after Luo-coil parallel connection, is directly connected to afterwards in detection system, can gather multi channel currents, multi channel currents is reduced to the front large current waveform of shunting by the integrating circuit of recycling coupling, and whole sensor does not use active device, adopts passive simulation stacking method, power consumption is very little, because acquisition channel reduces, it is arranged simply, implementation cost is low, and large electric current is difficult for producing corona, its security is good, and precision is high.Isolation resistance is used for isolating the different voltage of different Luo-coils, carries out the isolation of multiple coil output voltage, acts on sampling resistor R by different voltage
jon realize the stack of voltage, different from monocoil integrating circuit here, unicoil is directly connected on integrating circuit, and isolation resistance in the utility model and sampling resistor have realized the stack of multi-coil.
Further, above-mentioned integrating circuit adopts the outer integrating circuit of RC, comprises resistance R and capacitor C, all integration places outside of the integration of multiple like this sensors, only there is one point earth, and adopt Ground Electric Potential Rise or circulation that in traditional LR, integrating circuit can produce because of multipoint earthing mode.
Further, the wave impedance that the resistance of above-mentioned isolation resistance equals corresponding Luo-coil deducts sampling resistor R
jresistance, the resistance of isolation resistance adds sampling resistor R
jresistance should be consistent with the wave impedance of Luo-coil, guarantee the accuracy at electric current interflow in Luo-coil.
The beneficial effects of the utility model are:
(1) the utility model can gather multiple channel currents, and multi channel currents is reduced to the front large current waveform of shunting by the integrating circuit of recycling coupling, and whole sensor does not use active device, adopts passive simulation stacking method, and power consumption obtains very large reduction;
(2) the utility model is because acquisition channel reduces three, and it is arranged simply, implementation cost is low, and large electric current is difficult for producing corona, and its security is good, and precision is high;
(3) adopt the outer integrating circuit of RC,, only there is one point earth at all integration places outside of the integration of multiple like this sensors, Ground Electric Potential Rise or the circulation of avoiding multipoint earthing mode to produce.
Accompanying drawing explanation
Structural representation when Fig. 1 is the utility model application;
Fig. 2 is structural representation of the present utility model;
Fig. 3 is the electrical block diagram of Luo-coil and joint parallel circuit;
Fig. 4 is current waveform figure in pillar;
Fig. 5 is the current waveform figure in Luo-coil;
In figure, 1-Luo-coil, 2-integrating circuit, 3-shaft tower, 4-pillar, 5-detection system.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail:
[embodiment]
As shown in Figure 1, Figure 2, Figure 3 shows, shaft tower on-line monitoring system current acquisition sensor is used for being struck by lightning, be arranged on shaft tower 3, comprise that integrating circuit 2 and 1, four Luo-coil 1 of four Luo-coils are arranged on respectively on four pillars 4 of shaft tower 3, corresponding Luo-coil 1 place plane is perpendicular to corresponding pillar 4, and corresponding pillar 4 is through the center of corresponding Luo-coil 1, and all Luo-coils 1 are all parallel to a sampling resistor R
jupper, integrating circuit 2 is also parallel to sampling resistor R
jupper, on the output port of four Luo-coils 1, be all provided with respectively an isolation resistance, i.e. R in Fig. 3
l1～R
l4.This device is mainly used in gathering ground current, after Luo-coil 1 parallel connection, be connected on the integrating circuit 2 of coupling, be directly connected to afterwards in detection system 5, can gather multi channel currents, multi channel currents is reduced to the front large current waveform of shunting by the integrating circuit 2 of recycling coupling, whole sensor does not use active device, adopt passive simulation stacking method, power consumption is very little, because acquisition channel reduces, it is arranged simply, implementation cost is low, and large electric current is difficult for producing corona, its security is good, and precision is high.Isolation resistance, for isolating the different voltages of different Luo-coils 1, carries out the isolation of multiple coil output voltage, acts on sampling resistor R by different voltage
jon realize the stack of voltage, different from monocoil integrating circuit here, unicoil is directly connected on integrating circuit, and isolation resistance in the utility model and sampling resistor have realized the stack of multi-coil.
Further, above-mentioned integrating circuit 2 adopts the outer integrating circuit of RC, comprises resistance R and capacitor C, all integration places outside of the integration of multiple like this sensors, only there is one point earth, and adopt Ground Electric Potential Rise or circulation that in traditional LR, integrating circuit can produce because of multipoint earthing mode.
Further, the wave impedance that the resistance of above-mentioned isolation resistance equals corresponding Luo-coil 1 deducts sampling resistor R
jresistance, the resistance of isolation resistance adds sampling resistor R
jresistance should be consistent with the wave impedance of Luo-coil 1, guarantee the accuracy at electric current interflow in Luo-coil 1.
As Fig. 3,
mfor coil and be placed in the mutual inductance between the current－carrying conductor in the middle of coil,
l, C 0 the self-induction, the stray capacitance that are respectively coil, self-induction is in Fig. 3
l 1 -
l 4 , stray capacitance is in Fig. 3
c 01 -
c 04 , integral sensors performance calculating formula, its bound frequency, the relation of output signal and tested electric current is respectively:
Above in three formulas,
f l for lower frequency limit,
f h for upper limiting frequency,
u m for output signal,
i 1 ,
i 2 ,
i 3 ,
i 4 be respectively four electric currents in pillar, the electric current that we need to test.
Obviously, four Luo-coil parallel connections and single Luo-coil are without current-limiting resistance comparison, if measure same electric current, output signal
u m amplitude declines, lower frequency limit
f l constant, upper limiting frequency
f h rise, can measured frequency scope broaden, output signal is linearly proportional with measurement electric current, and input component difference does not affect Output rusults.
Therefore, when four Luo-coils of use in parallel are measured electric current, output linearity degree is constant, can survey maximum amplitude and improve, and sensitivity declines, and responsive bandwidth increases.In order to meet former measurement requirement, can carry out corresponding modify to coil parameter or circuit design, for example increase amplifying circuit at collecting unit, reduce integrating resistor, integrating capacitor etc.From another aspect, in the situation that not changing univers parameter, it is larger that Luo-coil in parallel can be measured current amplitude, and frequency is wider, and the more single Luo-coil of overall performance is better.
Carry out an experiment below, i.e. emulation thunderbolt shaft tower earth current is measured:
Luo-coil is arranged on four, shaft tower and supports correct position, and as Figure of abstract, emulation lightning wave adopts wave head 1.2 s, wave rear 50 s triangle oblique waves, and single Luo-coil input amplitude 20kA, four coil total current 80KA, the coiling of Luo-coil peace lightning current measuring,
m=2.26
h; Outer integrating circuit is got
r l1 =R l2 =R l4 =R l3 =R j =50 Ω,
r=500 Ω,
c=1 μ F.
Obtain according to formula (1) (2) (3):
f l= 
hz,
f h =5.9
10
6hz,
u m =1.128V.
Simulation result is as Fig. 5, and amplitude is relevant with simulation software internal processes, different from calculated value, does not affect measurement requirement.Comparison diagram 4 is inputted waveform, Fig. 5 output waveform, and sensor input-output wave shape is consistent, and result can be reduced primary current waveform, meets and measures requirement.
From be applicable to be comparatively speaking the struck by lightning measurement of large electric current of the known the utility model of upper analysis, the more single Luo-coil of overall performance will be got well.Regulate by coil parameter simultaneously, change outer integrating circuit, can meet the measurement of other types hyperchannel dash current.
Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (3)
1. for the shaft tower on-line monitoring system current acquisition sensor that is struck by lightning, be arranged on shaft tower (3), it is characterized in that: comprise integrating circuit (2) and four Luo-coils (1), four Luo-coils (1) are arranged on respectively on four pillars (4) of shaft tower (3), corresponding Luo-coil (1) place plane is perpendicular to corresponding pillar (4), and corresponding pillar (4) is through the center of corresponding Luo-coil (1), and all Luo-coils (1) are all parallel to a sampling resistor R
jupper, integrating circuit (2) is also parallel to sampling resistor R
jupper, on the output port of described Luo-coil (1), be all provided with respectively an isolation resistance.
2. according to claim 1ly it is characterized in that for the shaft tower on-line monitoring system current acquisition sensor that is struck by lightning, described integrating circuit is the outer integrating circuit of RC, comprises resistance R and capacitor C.
3. according to claim 1ly it is characterized in that for the shaft tower on-line monitoring system current acquisition sensor that is struck by lightning, the wave impedance that the resistance of described isolation resistance equals corresponding Luo-coil (1) deducts sampling resistor R
jresistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320781286.2U CN203595743U (en) | 2013-12-03 | 2013-12-03 | Current acquisition sensor used for lightning stoke tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320781286.2U CN203595743U (en) | 2013-12-03 | 2013-12-03 | Current acquisition sensor used for lightning stoke tower |
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| CN203595743U true CN203595743U (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320781286.2U Expired - Lifetime CN203595743U (en) | 2013-12-03 | 2013-12-03 | Current acquisition sensor used for lightning stoke tower |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108701532A (en) * | 2015-11-30 | 2018-10-23 | 鹰港科技有限公司 | High-tension transformer |
| CN109507552A (en) * | 2018-11-29 | 2019-03-22 | 清华大学 | Shaft tower shock wave impedance detection method and device based on tower top back wave |
-
2013
- 2013-12-03 CN CN201320781286.2U patent/CN203595743U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108701532A (en) * | 2015-11-30 | 2018-10-23 | 鹰港科技有限公司 | High-tension transformer |
| CN109507552A (en) * | 2018-11-29 | 2019-03-22 | 清华大学 | Shaft tower shock wave impedance detection method and device based on tower top back wave |
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Granted publication date: 20140514 |
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| CX01 | Expiry of patent term |