CN201681115U - Current sensor used for grounding current detection of transmission poles and towers - Google Patents
Current sensor used for grounding current detection of transmission poles and towers Download PDFInfo
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- CN201681115U CN201681115U CN2010201134157U CN201020113415U CN201681115U CN 201681115 U CN201681115 U CN 201681115U CN 2010201134157 U CN2010201134157 U CN 2010201134157U CN 201020113415 U CN201020113415 U CN 201020113415U CN 201681115 U CN201681115 U CN 201681115U
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- current sensor
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Abstract
The utility model discloses a current sensor used for grounding current detection of transmission poles and towers. The current sensor comprises an aluminum alloy casing, an ultracrystallite magnetic core, a coil, a coil lead wire, a shielded cable for signal transmission, and a signal processing device, wherein the aluminum alloy casing is divided into a left casing and a right casing in a detachable way; the ultracrystallite magnetic core is placed in the aluminum alloy casing; the coil is spirally and closely surrounded on an adapter on the ultracrystallite magnetic core, one end of the coil is installed outside the aluminum alloy casing, and a socket is installed at the other end of the coil; the coil lead wire is connected with the socket through the adapter; the shielded cable for signal transmission is connected with the socket; and the signal processing device is connected with the shielded cable for signal transmission and is used for converting the current signal acquired on the coil into square wave. The grounding current of transmission poles and towers can be accurately measured through the current sensor provided by the utility model, and the current sensor can be applied to wider measuring range and wider response frequency band.
Description
Technical field
The utility model relates to a kind of current sensor that can accurately measure the ground current of electric power line pole tower, and particularly a kind of employing is wound with the current sensor of the ultracrystallite magnetic core of tight coil.
Background technology
Transmission line of electricity is dispersed on the wide region, is located in the wilderness, is struck by lightning easily, fault such as pollution flashover.The electric power line pole tower flashover happens occasionally.The electric power line pole tower flashover can make whole piece transmission line of electricity and whole power distribution network break down, and the safe operation of transmission system is caused grave danger.
The electric power line pole tower flashover has comprised insulator contamination flashover and thunderbolt shaft tower flashover.Be exposed to the constantly airborne dunghill of accumulation of airborne insulator surface.If insulator surface equivalent salt deposit density and surface moisture reach certain degree, the leakage current of insulator surface will increase, even finally pollution flashover takes place.The flashover current that the insulator contamination flashover produces can flow to the earth along shaft tower.The electric power line pole tower lightning stroke flashover is to set up discharge channel by the superpotential that thundercloud discharge causes by overhead line structures, causes line insulation to puncture.The lightning stroke flashover electric current also can flow to the earth by shaft tower.Therefore, can and analyze the shaft tower ground current and understand the relevant situation of electric power line pole tower by monitoring.
For obtaining of ground current, generally use the method for current sensor.Tradition band current sensor unshakable in one's determination adopts ferromagnetic material and complicated coil winding to make, and its frequency band is narrower, and iron core can produce magnetic saturation when measuring big electric current, and the signal output waveform distortion is serious when saturated.Simultaneously traditional current sensor exists also that volume is big, cost is high, baroque problem.Traditional current sensor can not well satisfy the ground current Testing requirement, replaces traditional current transformer so press for novel current sensor.
The utility model content
The purpose of this invention is to provide and a kind ofly can accurately measure the current sensor of the ground current of electric power line pole tower, and can be applicable to the bigger measurement range and the response band of broad.
For solving the problems of the technologies described above, the current sensor that is used for the detection of power transmission line shaft tower ground current that the utility model provides comprises:
Aluminum alloy casing, its be divided into be detachable about two shells;
The ultracrystallite magnetic core, it is positioned in the described aluminum alloy casing;
Coil, its in the shape of a spiral formula closely be centered around on the described ultracrystallite magnetic core;
Adapter, one end are installed in described aluminum alloy casing outside, and the other end is equiped with socket; The extension line of described coil links to each other with described socket via described adapter;
The maskable cable of signal transmission usefulness, it links to each other with described socket; And
Signal processing apparatus, its maskable cable with described signal transmission usefulness links to each other, and the current signal that is used for obtaining on the described coil changes into square wave.
As a kind of preferred version of the present utility model, described signal processing apparatus comprises and linking successively
Protective device is used to prevent that described current signal is excessive and signal processing apparatus is caused damage;
Fairing is used for described signal transmission component is converted into direct current signal from the current signal that described coil obtains;
The dividing potential drop sampling apparatus is used for described direct current signal is converted into voltage signal and obtains the dividing potential drop sampled signal; And
Control device is used for the magnitude of voltage from described dividing potential drop sampling apparatus output is compared and then be output as high level or low level with the standard voltage value of presetting.
As a kind of preferred version of the present utility model, described protective device is a fuse, and it is installed in the signal leading-in end of described signal processing apparatus.
As a kind of preferred version of the present utility model, described fairing comprises the bridge rectifier circuit that is constituted by a diode.
As a kind of preferred version of the present utility model, described dividing potential drop sampling apparatus is the two dividing potential drop sampling resistors of connecting mutually.
As a kind of preferred version of the present utility model, described control device is for dividing the computing amplifier.
As a kind of preferred version of the present utility model, described control device judges that when the magnitude of voltage of described dividing potential drop sampling apparatus output was higher than described default standard voltage value, then described control device was exported described default standard voltage value, i.e. high level;
Described control device is judged when the magnitude of voltage of described dividing potential drop sampling apparatus output is lower than described default standard voltage value, then described control device output low level.
As a kind of preferred version of the present utility model, described high level is 3.3 volts of magnitudes of voltage, and described low level is 0 volt of magnitude of voltage.
As a kind of preferred version of the present utility model, described ultracrystallite magnetic core in the form of a ring.
As a kind of preferred version of the present utility model, described be detachable about an end of two shells be movably connected by hinge, and the other end links to each other by screw retention.
The ultracrystallite magnetic core that the current sensor that is used for the detection of power transmission line shaft tower ground current of the present utility model will be wound with the tight coil of one deck is put into aluminum alloy casing, then two of coil is drawn in order to connect signal processing apparatus the ground current signal that obtains on the coil is changed into square wave, by measuring holding time and then distinguishing thunder-strike current, lightning stroke flashover electric current and pollution flashover electric current of square wave high level, thereby realize the accurate measurement of power transmission line shaft tower ground current.
Another technique effect of the present utility model is, utilizes the magnetic core of ultracrystallite magnetic material to have characteristics such as high magnetic permeability, low-loss, coercive force are little, high-saturation magnetic induction, high stability and compares with other soft magnetic material, is easier to processing.
Another technique effect of the present utility model is, only need compare numerical values recited and signal aspect and can distinguish thunder-strike current, lightning stroke flashover electric current and pollution flashover electric current, its reaction velocity rapidly and reaction result accurately and reliably.
Description of drawings
Below in conjunction with accompanying drawing and better embodiment the utility model is described in further detail.
Fig. 1 is the structural representation that is used for the current sensor of power transmission line shaft tower ground current detection of the present utility model;
Fig. 2 is the electrical schematic diagram that is used for the signal processing apparatus of the current sensor that power transmission line shaft tower ground current detects of the present utility model; And
Fig. 3 is the synoptic diagram that thunder-strike current, lightning stroke flashover electric current and pollution flashover electric current is converted into square wave that is used for the signal processing apparatus of the current sensor that power transmission line shaft tower ground current detects of the present utility model.
Among the figure,
10. current sensor
11. aluminum alloy casing 12. ultracrystallite magnetic cores 13. coils
131. lead-out wires of coil 14. adapters 15. 2 core aviation waterproof connectors
16. hinge 17 screws
20. the circuit of signal processing apparatus
FU1, FU2 insurance D1-D4 commutation diode
R1, R2 dividing potential drop sampling resistor U1A operational amplifier
30 thunder-strike currents, lightning stroke flashover electric current and the pairing square wave of pollution flashover electric current
The high level lasting time of T1 thunder-strike current (microsecond level)
The high level lasting time of T2 lightning stroke flashover electric current (microsecond level)
The high level lasting time (Millisecond) of T3 lightning stroke flashover electric current
The high level lasting time (Millisecond) of T4 pollution flashover electric current
Embodiment
As shown in Figure 1, the current sensor that is used for the detection of power transmission line shaft tower ground current that the utility model provides comprises aluminum alloy casing 11, it is divided into left and right two shells that are detachable, one end of these left and right two shells is movably connected by hinge 16, and the other end is fixedly linked by screw 17, when needs are packed into or take out magnetic core 12, only need screw 17 is turned on, pack into or take out and tighten screw 17 behind the magnetic core 12 and get final product; Ultracrystallite magnetic core 12 in the form of a ring, it is positioned in the described aluminum alloy casing 11; Coil 13, its in the shape of a spiral formula closely be centered around on the described ultracrystallite magnetic core 12; Adapter 14, one end are installed in described aluminum alloy casing 11 outsides, and the other end is equiped with socket, and lead-out wires of coil 131 links to each other with described socket via described adapter 14, select two core aviation waterproof connectors 15 for use in socket described in the present embodiment; Two core maskable cables of signal transmission usefulness, it links to each other with described two core aviation waterproof connectors 15; Two kinds of aviation plugs are done at two core maskable cable two ends respectively, and an end of waterproof can be inserted in the two core aviation waterproof connectors 15 of sensor, use an end of common aviation plug can be inserted on the interface on the ground current signal-processing board.
The current sensor that is used for the detection of power transmission line shaft tower ground current that the utility model provides also comprises signal processing apparatus, and its two core maskable cables with described signal transmission usefulness link to each other, and the current signal that is used for obtaining on the described coil changes into square wave.
As shown in Figure 2, described signal processing apparatus comprises the protective device that links successively, be used to prevent that described current signal is excessive and signal processing apparatus is caused damage, in protective device described in the present embodiment is that model is fuse FU1, the FU2 of SMD1812P110TF, and it is installed in the signal leading-in end of described signal processing apparatus; Fairing is used for described signal transmission component is converted into direct current signal from the current signal that described coil obtains, and comprises the bridge rectifier circuit of being made up of diode D1, D2, D3, D4 in fairing described in the present embodiment; The dividing potential drop sampling apparatus is used for described direct current signal being converted into voltage signal and obtaining the dividing potential drop sampled signal, is two dividing potential drop sampling resistor R1, the R2 that connect mutually in the sampling apparatus of dividing potential drop described in the present embodiment; And control device, be used for the magnitude of voltage from described dividing potential drop sampling apparatus output is compared and then be output as high level or low level with the standard voltage value of presetting, be branch computing amplifier U1A in control device described in the present embodiment.
The input signal of the circuit 20 of signal processing apparatus is introduced by two core maskable cables, and output can connect the A/D port of microprocessor.Through behind the treatment circuit, the ground current signal has just become the square wave form, so just can carry out sampling analysis by microprocessor.
Described control device judges that when the magnitude of voltage of described dividing potential drop sampling apparatus output was higher than described default standard voltage value, then described control device was exported described default standard voltage value, i.e. high level; Described control device is judged when the magnitude of voltage of described dividing potential drop sampling apparatus output is lower than described default standard voltage value, then described control device output low level.
In high level described in the present embodiment is 3.3 volts of magnitudes of voltage, and described low level is 0 volt of magnitude of voltage.
Because thunder-strike current, lightning stroke flashover electric current and pollution flashover electric current all can flow to the earth by shaft tower, therefore to distinguish these three kinds of electric currents.By analyzing the curve of three kinds of electric currents, we know that thunder-strike current is that a wave head average length is about 2 μ s-2.5 μ s, and wavelength on average is about the shock wave of 50 μ s; The lightning stroke flashover electric current not only has the similar shock wave of thunder-strike current, and has the generation of industrial frequency harmonic after this ripple; Do not have shock wave in the pollution flashover current waveform profile and have only the power frequency ripple.The circuit 20 of this signal processing apparatus is by being provided with certain cut-off voltage, and the ground current that will flow through shaft tower is converted into square wave.
As shown in Figure 3, the square wave of thunder-strike current correspondence only has a high level of keeping tens microseconds; The square wave of lightning stroke flashover electric current correspondence not only has a high level of keeping tens microseconds, and can detect the high level of a few tens of milliseconds; The square wave of pollution flashover electric current correspondence only can detect the high level of having kept a few tens of milliseconds.Square wave after the circuit 20 of this signal processing apparatus will be handled is received microprocessor A/D port, has made things convenient for microprocessor to the ground current signals sampling like this, and just can easily distinguish this three kinds of ground currents by surveying holding time of square wave high level.
Below preferred embodiment of the present utility model is specified, but the utility model is not limited to described embodiment, those of ordinary skill in the art also can make all modification that is equal to or replacement under the prerequisite of spirit of the present invention, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (10)
1. one kind is used for the current sensor that power transmission line shaft tower ground current detects, and it is characterized in that described current sensor comprises:
Aluminum alloy casing, its be divided into be detachable about two shells;
The ultracrystallite magnetic core, it is positioned in the described aluminum alloy casing;
Coil, its in the shape of a spiral formula closely be centered around on the described ultracrystallite magnetic core;
Adapter, one end are installed in described aluminum alloy casing outside, and the other end is equiped with socket; The extension line of described coil links to each other with described socket via described adapter;
The maskable cable of signal transmission usefulness, it links to each other with described socket; And
Signal processing apparatus, its maskable cable with described signal transmission usefulness links to each other, and the current signal that is used for obtaining on the described coil changes into square wave.
2. current sensor according to claim 1 is characterized in that, described signal processing apparatus comprises and linking successively
Protective device is used to prevent that described current signal is excessive and signal processing apparatus is caused damage;
Fairing is used for described signal transmission component is converted into direct current signal from the current signal that described coil obtains;
The dividing potential drop sampling apparatus is used for described direct current signal is converted into voltage signal and obtains the dividing potential drop sampled signal; And
Control device is used for the magnitude of voltage from described dividing potential drop sampling apparatus output is compared and then be output as high level or low level with the standard voltage value of presetting.
3. current sensor according to claim 2 is characterized in that, described protective device is a fuse, and it is installed in the signal leading-in end of described signal processing apparatus.
4. current sensor according to claim 2 is characterized in that described fairing comprises the bridge rectifier circuit that is constituted by a diode.
5. current sensor according to claim 2 is characterized in that, described dividing potential drop sampling apparatus is the two dividing potential drop sampling resistors of connecting mutually.
6. current sensor according to claim 2 is characterized in that, described control device is for dividing the computing amplifier.
7. according to the described current sensor of one of claim 2 to 6, it is characterized in that, described control device judges that when the magnitude of voltage of described dividing potential drop sampling apparatus output was higher than described default standard voltage value, then described control device was exported described default standard voltage value, i.e. high level;
Described control device is judged when the magnitude of voltage of described dividing potential drop sampling apparatus output is lower than described default standard voltage value, then described control device output low level.
8. current sensor according to claim 7 is characterized in that, described high level is 3.3 volts of magnitudes of voltage, and described low level is 0 volt of magnitude of voltage.
9. current sensor according to claim 8 is characterized in that, described ultracrystallite magnetic core in the form of a ring.
10. current sensor according to claim 9 is characterized in that, described be detachable about an end of two shells be movably connected by hinge, and the other end links to each other by screw retention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201134157U CN201681115U (en) | 2010-02-11 | 2010-02-11 | Current sensor used for grounding current detection of transmission poles and towers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201134157U CN201681115U (en) | 2010-02-11 | 2010-02-11 | Current sensor used for grounding current detection of transmission poles and towers |
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| Publication Number | Publication Date |
|---|---|
| CN201681115U true CN201681115U (en) | 2010-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201134157U Expired - Fee Related CN201681115U (en) | 2010-02-11 | 2010-02-11 | Current sensor used for grounding current detection of transmission poles and towers |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435812A (en) * | 2011-09-22 | 2012-05-02 | 广东电网公司深圳供电局 | Insulator leakage current collecting ring and insulator leakage current collecting device |
| CN103487627A (en) * | 2012-06-11 | 2014-01-01 | 王铁流 | Passive tower grounding lightning current intensity detector |
| CN105548813A (en) * | 2016-01-06 | 2016-05-04 | 天津浩源慧能科技有限公司 | Pole grounding fault detection apparatus and detection method |
| CN108051666A (en) * | 2017-11-21 | 2018-05-18 | 北京智芯微电子科技有限公司 | Non-contact type signal gathers sensor and low pressure branch switch cabinet state monitoring apparatus |
| CN108152565A (en) * | 2018-01-06 | 2018-06-12 | 李海斌 | Electric power line cross arm safety device |
| CN108181499A (en) * | 2018-01-11 | 2018-06-19 | 李海斌 | Electric pole security protection anticollision paint |
-
2010
- 2010-02-11 CN CN2010201134157U patent/CN201681115U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435812A (en) * | 2011-09-22 | 2012-05-02 | 广东电网公司深圳供电局 | Insulator leakage current collecting ring and insulator leakage current collecting device |
| CN102435812B (en) * | 2011-09-22 | 2014-09-03 | 广东电网公司深圳供电局 | Insulator leakage current collecting ring and insulator leakage current collecting device |
| CN103487627A (en) * | 2012-06-11 | 2014-01-01 | 王铁流 | Passive tower grounding lightning current intensity detector |
| CN105548813A (en) * | 2016-01-06 | 2016-05-04 | 天津浩源慧能科技有限公司 | Pole grounding fault detection apparatus and detection method |
| CN105548813B (en) * | 2016-01-06 | 2018-08-14 | 天津浩源慧能科技有限公司 | A kind of tower grounding failure detector and detection method |
| CN108051666A (en) * | 2017-11-21 | 2018-05-18 | 北京智芯微电子科技有限公司 | Non-contact type signal gathers sensor and low pressure branch switch cabinet state monitoring apparatus |
| CN108152565A (en) * | 2018-01-06 | 2018-06-12 | 李海斌 | Electric power line cross arm safety device |
| CN108181499A (en) * | 2018-01-11 | 2018-06-19 | 李海斌 | Electric pole security protection anticollision paint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20110211 |