CN205139235U - Stabilize non -linear transmission line thunder current measurement circuit - Google Patents
Stabilize non -linear transmission line thunder current measurement circuit Download PDFInfo
- Publication number
- CN205139235U CN205139235U CN201520859827.8U CN201520859827U CN205139235U CN 205139235 U CN205139235 U CN 205139235U CN 201520859827 U CN201520859827 U CN 201520859827U CN 205139235 U CN205139235 U CN 205139235U
- Authority
- CN
- China
- Prior art keywords
- current
- voltage
- transmission line
- lightning
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model belongs to the technical field of high voltage electric power equip ment state monitoring and fault diagnosis's research, application, in particular to stabilize non -linear transmission line thunder current measurement circuit, including thunder current measurement coil, induced voltage amplifier, voltage -current conversion ware and wireless transmitter, thunder current measurement coil changes into the lightning current that detects the magnetic field of change and exports induced voltage to induced voltage amplifier, the induced voltage amplifier enlargies the back with voltage signal, exports it to the voltage -current conversion ware, the voltage -current conversion ware converts voltage signal to current signal, exports it to wireless transmitter, wireless transmitter is with its electric current signal transmission to distal end after receiving measuring -signal, the utility model discloses avoid the influence of ground resistance transmutation to measurement accuracy, promoted thunder current monitoring and thunderbolt fault type diagnosis effect by a wide margin.
Description
Technical field
The utility model belongs to research, the applied technical field of high voltage electric power equip ment condition monitoring and fault diagnosis, and particularly one stablizes nonlinear power transmission line lightning shielding flow measurement circuit.
Background technology
Transmission line of electricity tripping operation directly affects the electric power concerning national economy and reliably supplies.And data statistics shows, because the number of times accounting tripped by cause of lightning stroke can reach 65% in 110kV and above transmission line of electricity tripping operation sum.In addition, the lightning fault of transmission line of electricity causes primarily of lightning current shielding or counterattack; And the mechanism occurred because of both is different, safeguard procedures are also not quite similar.Wherein amplitude of lightning current is received in shielding, the impact of earth-wire protection angle is comparatively large, and the grounded screen electric resistance of strikeing back by amplitude of lightning current, thunder and lightning interference and shaft tower affects larger.As the concrete reason type (shielding, counterattack) of lightning fault cannot be judged, be then difficult to formulate lightning protection measures targetedly, and then also affect the safe and stable operation of electric system.Therefore, the lightning current studying power transmission line corridor is monitored of great advantage national development, social stability.
Lighting current sensor can must launch a surprise attack time, lightning current peak value by real-time telemetry thundercloud over the ground, and can reliably for thunder activity law research and transmission line of electricity lightning Protection Design.But lightning current is huge, traditional shunt is not also suitable for measurement lightning current.Therefore be necessary that design one has that low-power exports, structure simply, the linear characteristic such as good, and the lightning current monitoring device on electric power line pole tower or insulator chain can be arranged on.
Given this, to need in existing application experience research and development badly and can possess and stablize nonlinear power transmission line lightning shielding flow measurement circuit, and in order to promote the effect of lightning current monitoring device.
Utility model content
The purpose of this utility model is the problems referred to above solving prior art, provide a kind of non-linear and can by large lightning current measuring coil and integrating amplifier realize measurements in real time, high-speed response, can not the power transmission line lightning shielding flow measurement circuit of saturated, low-power output, and be applicable to the thunderbolt monitoring of the large alternating current of high frequency in transmission line of electricity running environment, thus promote the effect of lightning monitoring device, to achieve these goals, the technical solution adopted in the utility model is as follows:
One stablizes nonlinear power transmission line lightning shielding flow measurement circuit, it is characterized in that: comprise lightning current measuring coil, induced voltage amplifier, voltage current adapter and wireless signal transmitter, the lightning current of detection is changing into the magnetic field of change and exports induced voltage to induced voltage amplifier by described lightning current measuring coil, after voltage signal amplifies by described induced voltage amplifier, exported to voltage current adapter, described voltage current adapter converts voltage signal to current signal, exported to wireless signal transmitter, its current signal is delivered to far-end by described wireless signal transmitter after receiving measuring-signal.
Preferably, described induced voltage amplifier is scaling signal amplifying circuit, described scaling signal amplifying circuit comprises the first proportion operational amplifier, resistance R1 and resistance R2, described voltage current adapter is anti-phase integrated signal change-over circuit, described anti-phase integrated signal change-over circuit comprises the second proportion operational amplifier, resistance R3 and electric capacity Cx, be connected with the output terminal of lightning current measuring coil again after one end of described resistance R1 is connected with one end of resistance R2, the described resistance R1 other end is connected with the output terminal of proportional amplifier, the other end of resistance R2 is connected with the negative input of the first proportion operational amplifier, the electrode input end of described first proportion operational amplifier is connected to ground, one end of described resistance R3 is connected with the electrode input end of the first proportion operational amplifier, the other end of described resistance R3 respectively with one end of electric capacity Cx, the negative input of the second proportion operational amplifier connects, the other end of described electric capacity Cx is connected with the first input end of wireless signal transmitter respectively, the output terminal of described second proportion operational amplifier is also connected with the second input end of wireless signal transmitter, the electrode input end of described second proportion operational amplifier is connected to ground.
Preferably, the output area of described voltage current adapter is 4 ~ 20mA/DC.
Preferably, described wireless signal transmitter is antenna or GPRS wireless communication module.
Preferably, described lightning current measuring coil is by flexible back bone be wrapped in the copper cash on flexible back bone and the hollow circular coil that formed.
Preferably, described lightning current measuring coil measurement range is no more than 500000A/AC.
Preferably, the diameter of described copper cash is 1.8mm.
In sum, the utility model is owing to have employed above technical scheme, and the utility model has following beneficial effect:
The first, the utility model accurate measurements flows through the monitoring device of equipment lightning current nonlinearities change, has thoroughly evaded the impact of stake resistance transmuting on measuring accuracy, significantly improves lightning current monitoring and lightning fault type diagnostic effect.
The second, based on the capacitive filter undesired signal in anti-phase integrator, capture the deviation between output signal and tested current amplitude at one stroke, significantly improved the inspection effect of line tripping trouble spot.
3rd, the utility model has started lightning current measuring data persistence Real-time feed back techniques, has broken the technical bottleneck of trace analysis power transmission line corridor thunder activity law and thunderbolt type, has has effectively prevented and treated transmission line lightning stroke tripping operation.
4th, the utility model structure is simple, can measure lightning current easily, reduces the production cost of lightning current monitoring device, facilitates applying of monitoring device.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model example or technical scheme of the prior art, introduce doing accompanying drawing required in embodiment or description of the prior art simply below, obviously, accompanying drawing in the following describes is only examples more of the present utility model, to those skilled in the art, do not paying under creationary prerequisite, other accompanying drawing can also obtained according to these accompanying drawings.
Fig. 1 is that one of the present utility model stablizes nonlinear power transmission line lightning shielding flow measurement circuit.
Fig. 2 is lightning current measuring coil principle structural drawing of the present utility model.
In figure: 1-lightning current measuring coil, 2-induced voltage amplifier, 3-voltage current adapter, 4-wireless signal transmitter.
Embodiment
Below in conjunction with the accompanying drawing in the utility model example, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, one stablizes nonlinear power transmission line lightning shielding flow measurement circuit, comprise lightning current measuring coil 1, induced voltage amplifier 2, voltage current adapter 3, wireless signal transmitter 4, when tested lightning current by described by lightning current measuring coil 1 center time, the magnetic field of corresponding change is formed in the volume that Circular Winding is surrounded, and export induced voltage to induced voltage amplifier 2, described induced voltage amplifier 2 is after passing ratio signal amplification circuit amplifies induced voltage signal, exported to voltage current adapter 3, described voltage current adapter 3 filters undesired signal by electric capacity Cx, and after being current signal by anti-phase integrator changing voltage, exported to wireless signal transmitter 4, wireless signal transmitter 4 is after receiving measuring-signal, time will be launch aed surprise attack, the key messages such as lightning current peak value are sent to monitoring and warning center or the server of far-end, described wireless signal transmitter is timely with monitor value of being correlated with TCP or UDP communications protocol by the mode of GPRS radio communication, stably be sent to monitoring and warning center or the server of far-end.
In the utility model is implemented, described induced voltage amplifier is scaling signal amplifying circuit, and described scaling signal amplifying circuit comprises the first proportion operational amplifier, resistance R
1with resistance R
2, described voltage current adapter is anti-phase integrated signal change-over circuit, and described anti-phase integrated signal change-over circuit comprises the second proportion operational amplifier, resistance R
3with electric capacity Cx, described resistance R
1one end and resistance R
2one end connect after be connected with the output terminal of lightning current measuring coil again, the described resistance R1 other end is connected with the output terminal of proportional amplifier, resistance R
2the other end be connected with the negative input of the first proportion operational amplifier, the electrode input end of described first proportion operational amplifier is connected to ground, described resistance R
3one end be connected with the electrode input end of the first proportion operational amplifier, described resistance R
3the other end be connected with one end of electric capacity Cx, the negative input of the second proportion operational amplifier respectively, the other end of described electric capacity Cx is connected with the first input end of wireless signal transmitter respectively, the output terminal of described second proportion operational amplifier is also connected with the second input end of wireless signal transmitter, and the electrode input end of described second proportion operational amplifier is connected to ground.Its signal amplification factor K=R of described induced voltage amplifier
2/ R
1; Integration time constant τ=the R of described voltage current adapter
3cx; The output area of described voltage current adapter is 4 ~ 20mA/DC.
As shown in Figure 2, in the utility model is implemented, described lightning current measuring coil 1 is by flexible back bone and be wrapped in the copper cash on nonferromagnetic flexible back bone and the hollow circular coil that formed, belongs to flexible open-close type loop configuration; And adopting diameter to be the nonmagnetic polyurethane paint copper round wire of 1.8mm around the copper cash on flexible back bone, the material outsourcing of flexible back bone is in order to the electrically insulating silicone rubber of compensating thermal errors.Lightning current measuring coil 1 can measure alternating current, specifically known according to " Faraday's electromagnetic induction law " and " Ampere circuit law ", when lightning current passes through lightning current measuring coil 1 center along set annular axis, the magnetic field of corresponding change will be formed in the volume that Circular Winding is surrounded, field intensity is H, can be obtained by Ampere circuit law: ∮ Hdl=I (t)
By B=μ H, e (t)=d Φ/dt, Ф=N ∫ BdS, e (t)=Mdi/dt:
The section of lightning current measuring coil 1 is rectangle, its coefficient of mutual inductance M, and the coefficient of mutual inductance M of described lightning current measuring coil 1 is definite value, and its output voltage is also directly proportional to di/dt, therefore,
M＝μ
0Nhln(b/a)/2π，
In above formula, H is the magnetic field intensity of lightning current measuring coil 1 inside, and B is the magnetic induction density of lightning current measuring coil 1 inside, μ
0for permeability of vacuum, N is coil turn, and e (t) is the induced voltage at coil two ends, and a, b are respectively the internal-and external diameter of coil section, and h is depth of section.
Composition graphs 1, the utility model embody rule process is as follows:
1) combing transmission line of electricity history trip condition, determines the transmission of electricity corridor area that the thunderbolt frequency is higher, formulates the lightning current measuring circuit mount scheme of differentiation:
2) at the #28 shaft tower place of certain 220kV transmission line of electricity, point A/B/C three-phase installs lightning current measuring circuit.
3) lightning current measuring coil 1 is monitored and is responded to the big current (38kA) of launch aing surprise attack on #28 bar C phase insulator, and generates induced voltage and be sent to induced voltage amplifier 2;
4) amplify induced voltage signal at induced voltage amplifier 2, after voltage current adapter 3 changes the signal after amplifying into current signal, by wireless signal transmitter 4 measuring-signal is sent to far-end monitoring and warning center or or server; Namely be the measurement, the contrast and analysis that realize measuring thunder-strike current size by lightning current measuring coil 1, induced voltage amplifier 2, voltage current adapter 3, and Monitoring Data can be sent to monitoring personnel by wireless signal transmitter 4.In the utility model, described wireless signal transmitter 4 adopts G300 type industry GPRS wireless data transmission module;
5) transmission line of electricity operation maintenance personnel is after receiving trip signal, and global alignment analyzes lightning current measuring circuit and circuit master one protects, main two protections, the electric current of fault wave recording device, separate, find range and the information such as time.
6) flow through each phase insulator chain of a certain transmission line of electricity, impact that the distribution of current of lightning conducter and shaft tower junction change by stake resistance is limited, be considered as and suffer key character parameter of being struck by lightning.Given this, stablizing nonlinear power transmission line lightning shielding flow measurement circuit by having installed one on transmission line of electricity, lightning current size, the number of times of monitoring thunderbolt can be realized, and judge lightning fault type.Wherein, when lightning conducter is greater than insulator chain branch current to the electric current of shaft tower branch road, can be judged to be that explanation there occurs counterattack; Insulator chain branch current is larger to shaft tower branch current than lightning conducter, then there occurs shielding flashover;
7) through global alignment analysis, carry out trouble spot and make an inspection tour and diagnosis; In addition transformation, defect elimination work is targetedly formulated according to trip condition.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; allly to use within novel spirit and principle at this, any amendment done, equivalent replacement, improvement etc., within the protection domain that all should be included in utility model.
Claims (7)
1. stablize nonlinear power transmission line lightning shielding flow measurement circuit for one kind, it is characterized in that: comprise lightning current measuring coil, induced voltage amplifier, voltage current adapter and wireless signal transmitter, the lightning current of detection is changing into the magnetic field of change and exports induced voltage to induced voltage amplifier by described lightning current measuring coil, after voltage signal amplifies by described induced voltage amplifier, exported to voltage current adapter, described voltage current adapter converts voltage signal to current signal, exported to wireless signal transmitter, its current signal is delivered to far-end by described wireless signal transmitter after receiving measuring-signal.
2. one according to claim 1 stablizes nonlinear power transmission line lightning shielding flow measurement circuit, it is characterized in that: described induced voltage amplifier is scaling signal amplifying circuit, described scaling signal amplifying circuit comprises the first proportion operational amplifier, resistance R1 and resistance R2, described voltage current adapter is anti-phase integrated signal change-over circuit, described anti-phase integrated signal change-over circuit comprises the second proportion operational amplifier, resistance R3 and electric capacity Cx, be connected with the output terminal of lightning current measuring coil again after one end of described resistance R1 is connected with one end of resistance R2, the described resistance R1 other end is connected with the output terminal of proportional amplifier, the other end of resistance R2 is connected with the negative input of the first proportion operational amplifier, the electrode input end of described first proportion operational amplifier is connected to ground, one end of described resistance R3 is connected with the electrode input end of the first proportion operational amplifier, the other end of described resistance R3 respectively with one end of electric capacity Cx, the negative input of the second proportion operational amplifier connects, the other end of described electric capacity Cx is connected with the first input end of wireless signal transmitter respectively, the output terminal of described second proportion operational amplifier is also connected with the second input end of wireless signal transmitter, the electrode input end of described second proportion operational amplifier is connected to ground.
3. one according to claim 2 stablizes nonlinear power transmission line lightning shielding flow measurement circuit, it is characterized in that: the output area of described voltage current adapter is 4 ~ 20mA/DC.
4. one according to claim 1 and 2 stablizes nonlinear power transmission line lightning shielding flow measurement circuit, it is characterized in that: described wireless signal transmitter is antenna or GPRS wireless communication module.
5. one according to claim 1 and 2 stablizes nonlinear power transmission line lightning shielding flow measurement circuit, it is characterized in that: described lightning current measuring coil is by flexible back bone and be wrapped in the copper cash on flexible back bone and the hollow circular coil that formed.
6. one according to claim 5 stablizes nonlinear power transmission line lightning shielding flow measurement circuit, it is characterized in that: described lightning current measuring coil measurement range is no more than 500000A/AC.
7. one according to claim 5 stablizes nonlinear power transmission line lightning shielding flow measurement circuit, it is characterized in that: the diameter of described copper cash is 1.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520859827.8U CN205139235U (en) | 2015-11-02 | 2015-11-02 | Stabilize non -linear transmission line thunder current measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520859827.8U CN205139235U (en) | 2015-11-02 | 2015-11-02 | Stabilize non -linear transmission line thunder current measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205139235U true CN205139235U (en) | 2016-04-06 |
Family
ID=55625015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520859827.8U Active CN205139235U (en) | 2015-11-02 | 2015-11-02 | Stabilize non -linear transmission line thunder current measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205139235U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896812A (en) * | 2018-06-25 | 2018-11-27 | 国网湖南省电力有限公司 | A kind of counter for lightning arrester being easily installed |
| CN110007180A (en) * | 2018-01-05 | 2019-07-12 | 深圳康普盾科技股份有限公司 | A kind of ground line connection reliability test method and device |
-
2015
- 2015-11-02 CN CN201520859827.8U patent/CN205139235U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007180A (en) * | 2018-01-05 | 2019-07-12 | 深圳康普盾科技股份有限公司 | A kind of ground line connection reliability test method and device |
| CN108896812A (en) * | 2018-06-25 | 2018-11-27 | 国网湖南省电力有限公司 | A kind of counter for lightning arrester being easily installed |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107132445B (en) | Real-time on-line monitoring device for AC/DC lightning arrester | |
| CN102128972B (en) | Sensor device for monitoring transient voltage of broadband integral type power grid | |
| CN105158543A (en) | Acquisition unit for leak current of ultra high voltage direct-current arrester based on two Hall elements | |
| CN105182044A (en) | Ultrahigh voltage DC arrester state detection device with Hall sensor acting as framework | |
| CN106814243A (en) | City cable line-to-ground circulation on-Line Monitor Device | |
| CN104569671B (en) | A kind of current conversion station grounded screen direct current diverting coefficient method of testing | |
| CN205139235U (en) | Stabilize non -linear transmission line thunder current measurement circuit | |
| CN105182163B (en) | The online detecting system of UHVDC Arrester leakage current based on cloud | |
| CN203929870U (en) | A kind of superpotential harvester based on Zinc-oxide piezoresistor | |
| CN205103292U (en) | Acquisition unit based on two hall element reveal electric current to special high voltage direct current arrester | |
| CN103399258B (en) | Based on the travelling wave ranging front end analogue amount collection plate of high-precision hall effect | |
| CN211043488U (en) | Lightning arrester direct current reference voltage test acquisition device based on Zigbee | |
| CN103018571A (en) | Dual-coupling type on-line monitoring device of ground impedance of electric transmission line | |
| CN105301323A (en) | Ultrahigh voltage DC lightning arrester leakage current online detection method by using cloud technology | |
| CN204166047U (en) | A kind of lightning induced voltage sensor based on D-dot principle and measuring system | |
| CN104076193A (en) | Overvoltage collecting device based on zinc oxide varistor | |
| CN204008832U (en) | A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring | |
| CN205103294U (en) | Use device that hall sensor detected special high voltage direct current arrester state as framework | |
| CN206096238U (en) | Monitoring system of insulator flashover electric current | |
| CN204925306U (en) | System that listens on line of electric current is revealed to special high voltage direct current arrester based on cloud | |
| CN105158633B (en) | The method of UHVDC Arrester state on-line checking data is shared with cloud platform | |
| CN105445521A (en) | Optical voltage transformer | |
| CN210243745U (en) | Intelligent ground resistance monitoring terminal of highway lightning grounding device | |
| CN105182043B (en) | Detection device with non-contact sensor to UHVDC Arrester leakage current | |
| CN205103356U (en) | Use soft -magnetic piece as core to faint acquisition unit who reveals current signal of non -contact |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |