CN201697960U - Lightning current sensor with iron core - Google Patents
Lightning current sensor with iron core Download PDFInfo
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- CN201697960U CN201697960U CN2010202427136U CN201020242713U CN201697960U CN 201697960 U CN201697960 U CN 201697960U CN 2010202427136 U CN2010202427136 U CN 2010202427136U CN 201020242713 U CN201020242713 U CN 201020242713U CN 201697960 U CN201697960 U CN 201697960U
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- iron core
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- protective layer
- transient voltage
- current sensor
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Abstract
The utility model discloses a lightning current sensor with an iron core. The lightning current sensor comprises the iron core, an insulated sheath, an induction coil, a signal resistor, a transient voltage suppressor, signal lead-out heads, an insulated protective layer and movable connectors. The iron core is embedded in an insulated sheath cylinder; the induction coil is wound on the surface of the insulated sheath, and the tail end of the induction coil penetrates through the iron core inside the insulated sheath cylinder; the signal resistor is connected with the transient voltage suppressor in parallel and then connected to the head end and the tail end of the induction coil; the iron core, the insulated sheath, the induction coil, the signal resistor and the transient voltage suppressor are encapsulated in a hollow cavity by the insulated protective layer, bended to a ring shape, and connected into a closed ring by the movable connectors; and the signal lead-out heads are fixed on the movable connectors. The lightning current sensor has the advantages of firstly allowing the measured current range to be large, achieving good stability and good linearity of the output signals, and enabling the measurement precision to be capable of meeting related measurement demands, secondly being provided with the movable connectors and being easy for installation and use, and thirdly being small in volume, light in weight, simple in structure and low in construction cost.
Description
Technical field
The utility model relates to a kind of current measuring device, specifically is a kind of ribbon core formula lighting current sensor, is applicable to the measurement of high frequency or pulse high current.
Background technology
At present, be used for the pulse high current measured sensor and mainly contain two kinds, be i.e. divertor and Luo-coil.
The only suitable following electric current of 10kA of measuring of divertor; For the electric current more than the 10kA, though can adopt the mode of a plurality of divertor parallel connections to measure, the volume of back in parallel package unit will be very huge, heavy.Though the accuracy of industrial resistance shunt is nominally 0.5 grade usually, when it is used to measure big electric current,, thereby will have a strong impact on its accuracy of measurement because of self temperature variation will cause resistance value to change.Simultaneously, when adopting divertor to measure fast-changing pulse high current,, make its voltage of current potential output terminal that time shift can take place because there is kelvin effect in shunt.In addition, the defective that also has following two aspects when using divertor to measure the big electric current of lightning impulse: one, the shunt primary circuit must be disconnected and inserts tested loop during measurement, give to install and use and bring a lot of inconvenience, and the access of shunt also can have influence on the electric parameter of tested current return; Its two because shunt primary circuit and secondary circuit do not have electrical isolation, so it is not suitable for metering outfit or control device that microcomputer protective relay etc. contains computing machine.
Compare with divertor, Luo-coil itself does not have direct electrical link with tested current return, but by the measurement of electromagnetic field couples realization to big electric current, therefore with tested loop good electric insulation is arranged.Luo-coil survey frequency wide ranges (is generally 0.1～100MHz, the Luo-coil of particular design can reach the bandwidth of 2000MHz), the rise time of coil self little (as the nS order of magnitude), the accuracy of measurement height (is generally between 0.5%～2%, the Luo-coil of particular design can be better than 0.1%), be easy to digital quantity output, thereby realize measuring digitizing, networking and robotization, and can not produce danger such as inflammable, explosive, compliance with environmental protection requirements.
The Luo-coil of present domestic use mostly is hollow Luo-coil.Loss and non-linear effects that hollow Luo-coil has been brought when having avoided using iron core, but the inductance in this moment loop mainly provides by coil, is difficult for satisfying from integral condition, therefore the required coil turn of hollow Luo-coil is more, and volume is bigger.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming that existing hollow Luo-coil exists, and a kind of ribbon core formula lighting current sensor that is used for the lightning current monitoring is provided.
The utility model is as follows for the technical scheme that solves the problems of the technologies described above:
Ribbon core formula lighting current sensor, it is made up of insulating protective layer 1, active joint 2, signal leading-out end 3, iron core 4, insulation sheath 5, inductive coil 6, signal resistance 7 and Transient Voltage Suppressor 8; This sensor is an annular, and insulating protective layer 1 is the open annular pipe, and insulation sheath 5 is cylindric, and signal resistance 7 is metalfilmresistors; Each component locations and annexation are as follows:
Iron core 4 is embedded in insulation sheath 5 cylinders; Inductive coil 6 is wound on insulation sheath 5 outside surfaces, and its end passes in the insulation sheath cylinder, between iron core; Be connected to inductive coil 6 head and ends after signal resistance 7 and Transient Voltage Suppressor 8 are in parallel; Insulating protective layer 1 is encapsulated in above-mentioned iron core 4, insulation sheath 5, inductive coil 6, signal resistance 7, Transient Voltage Suppressor 8 in its cavity, and looped-shaped bending also is unified into close ring by active joint 2; Signal leading-out end 3 is fixed on the active joint 2.
Above-mentioned insulating protective layer 1 is the open annular pipe that adopts the PPR material to make.
The utlity model has following advantage and good effect:
1. the utility model volume is little, and is in light weight, simple in structure, cheap, and design has active joint, is easy to install and use.
2. the measurement range of the utility model lightning impulse current is 3kA～150kA; Stable output signal is good, good linearity, and precision can satisfy the measurement of correlation requirement, and its measuring error can be controlled in 3%; Coefficient of self-induction is big, internal resistance is little and be easy to realization from the integration structure.
3. be equiped with Transient Voltage Suppressor in the utility model device, can limit output voltage, the precision components in the signal measurement electronic module is shielded.
4. the utility model itself need not to install metal screen layer.
Description of drawings
Fig. 1 is the utility model ribbon core formula lighting current sensor schematic appearance;
Fig. 2 is the utility model ribbon core formula lighting current sensor inner structure synoptic diagram;
Fig. 3 is the active joint synoptic diagram.
Among the figure: insulating protective layer 1, active joint 2, signal leading-out end 3, iron core 4, insulation are outer 5, inductive coil 6, signal resistance 7, Transient Voltage Suppressor 8.
Embodiment
Using method of the present utility model and principle of work are:
Tested current passes from the center of ribbon core formula lighting current sensor during work, according to the law of electromagnetic induction, the output voltage of sensor becomes differential relationship with tested electric current, for this reason, for restoring tested electric current, make the output voltage of coil consistent, at port increase integrator induced potential is carried out Integral Processing and get final product with the actual phase of primary current.
Carry out the accurate measurement of big electric current by magnetic field coupling between the utility model and the tested current, need not and being electrically connected of tested current return, so can realize isolation between the high-low pressure.
The utility model selects for use the resistance sampling method to carry out signal sampling, this method is applicable to the measurement of high-frequency signal: when the frequency of tested electric current is very high (as the lightning impulse electric current), its angular frequency is very big, and the induction reactance ω L of sensor will be very big, easily satisfies from integral condition; The output voltage at sampling resistor two ends is directly proportional with the primary current amplitude, and phase place is identical, reaches by measuring the purpose that output voltage records input current.
Signal resistance (7) adopts metalfilmresistor, and its self-induction is little, and resistance is stable, is not subjected to the influence of tested electric current and variation of ambient temperature substantially; Simultaneously, it has enough thermal capacity, can prevent to blow; In addition, signal resistance has good shielding, has reduced the influence to the resistance inductance of tested current return and other stray magnetic fields.
Signal resistance (7) two ends are parallel with Transient Voltage Suppressor (8).When the two poles of the earth of Transient Voltage Suppressor were subjected to reverse transient state high energy impact events, it can be 10
-12In the time of S magnitude, the high impedance of its two interpolar is become Low ESR, absorb the surge power up to thousands of watts, the voltage clamp that makes two interpolars is in a predetermined value, protects precision components in the electronic circuit to avoid the damage of various surge pulses effectively.Transient Voltage Suppressor in the utility model magnitude of voltage of clamp is as required selected different parameters.
Linearity when the utility model is measured is good, and measurement requirement is satisfied in its shielding anti-interference measure, thus need not to be provided with metal screen layer, thereby simple in structure, cheap.
The utility model has been selected PPR material insulating protective layer.Good PPR tubing, that pipe fitting has is corrosion-resistant, waterproof knot, high temperature high voltage resistant, life-span are long, be easy to characteristics such as connection, and the flexibility of pipe fitting makes the device installation comparatively quick and safe and reliable, but the reduction of erection time, and executive cost saves 60% than copper pipe, has superior economy.
Below in conjunction with drawings and Examples the utility model is elaborated.
One, overall
As Fig. 1, Fig. 2, shown in Figure 3, the utility model comprises insulating protective layer 1, active joint 2, signal leading-out end 3, iron core 4, insulation sheath 5, inductive coil 6, signal resistance 7, Transient Voltage Suppressor 8.
Its position and annexation are:
Ribbon core formula lighting current sensor is iron core 4, insulation sheath 5, inductive coil 6, insulating protective layer 1 by internal layer to skin successively.
Iron core 4 is embedded in insulation sheath 5 cylinders; Inductive coil 6 is wound on insulation sheath 5 outside surfaces, and its end passes in the insulation sheath cylinder, between iron core; Be connected to inductive coil 6 head and ends after signal resistance 7 and Transient Voltage Suppressor 8 are in parallel; Insulating protective layer 1 is encapsulated in above-mentioned iron core 4, insulation sheath 5, inductive coil 6, signal resistance 7, Transient Voltage Suppressor 8 in its cavity, and looped-shaped bending also is unified into close ring by active joint 2; Signal leading-out end 3 is fixed on the active joint 2.
Two. functional part
1. insulating protective layer 1
The function of insulating protective layer 1 is that device package and sensor are shaped.
2. active joint 2
But active joint 2 is a kind of rotary joint style active joints made from the PPR material.
Its function is to disconnect or to connect sensor, so that install and use.
3. the signal leading-out end 3
Signal leading-out end 3 is a kind of common Signal connectors.
Its function is the extraction voltage signal.
4. iron core 4
Iron core 4 is to be made of several thin wires.
Its function is to increase inductance, thereby helps satisfying from integral condition, and required number of inductive coil turns is reduced.
5. insulation sheath 5
Insulation sheath 5 is that a kind of xsect is the cable sheath material of annulus, also desirable other elastomeric materials.
Its function is to support and insulation, isolates inner iron core 4 and outside inductive coil 6, and works to support inductive coil 6.
6. inductive coil 6
Inductive coil 6 is the multiturn coils that formed by the thin copper wire coiling.
Its function is the magnetic field that produces by tested electric current, realizes the mutual conversion of electric energy and magnetic energy, in coil induced potential.
7. signal resistance 7
Signal resistance 7 is metalfilmresistors, and its head and end is connected on the head and end of inductive coil 6.
Its function is the output measuring-signal.
8. Transient Voltage Suppressor 8
Transient Voltage Suppressor 8 is a kind of diodes.
Its function is the ceiling voltage of restriction inductive coil 6 outputs.
Three. principle of work
The ribbon core formula lighting current sensor that the utility model proposes comprises insulating protective layer 1, active joint 2, signal leading-out end 3, iron core 4, insulation sheath 5, inductive coil 6, signal resistance 7, Transient Voltage Suppressor 8.
During work, ribbon core formula lighting current sensor becomes closed hoop.When tested current when the center of ribbon core formula lighting current sensor is passed, can obtain required measuring-signal from the signal exit of sensor.
Claims (2)
1. ribbon core formula lighting current sensor, it is characterized in that it is made up of insulating protective layer (1), active joint (2), signal leading-out end (3), iron core (4), insulation sheath (5), inductive coil (6), signal resistance (7) and Transient Voltage Suppressor (8); This sensor is an annular, and insulating protective layer (1) is the open annular pipe, and insulation sheath (5) is cylindric, and signal resistance (7) is a metalfilmresistor; Each component locations and annexation are as follows:
Iron core (4) is embedded in insulation sheath (5) cylinder; Inductive coil (6) is wound on insulation sheath (5) outside surface, and its end passes in the insulation sheath cylinder, between iron core; Signal resistance (7) be connected to inductive coil (6) head and end after Transient Voltage Suppressor (8) is in parallel; Insulating protective layer (1) is encapsulated in above-mentioned iron core (4), insulation sheath (5), inductive coil (6), signal resistance (7), Transient Voltage Suppressor (8) in its cavity, and looped-shaped bending also is unified into close ring by active joint (2); Signal leading-out end (3) is fixed on the active joint (2).
2. ribbon core formula lighting current sensor according to claim 1 is characterized in that, described insulating protective layer (1) is the open annular pipe that adopts the PPR material to make, and by active joint, can disconnect or connect sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202427136U CN201697960U (en) | 2010-06-30 | 2010-06-30 | Lightning current sensor with iron core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202427136U CN201697960U (en) | 2010-06-30 | 2010-06-30 | Lightning current sensor with iron core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201697960U true CN201697960U (en) | 2011-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202427136U Expired - Fee Related CN201697960U (en) | 2010-06-30 | 2010-06-30 | Lightning current sensor with iron core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201697960U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346213A (en) * | 2011-08-09 | 2012-02-08 | 刘睿刚 | Weak current detection sensor |
| CN108776250A (en) * | 2017-03-30 | 2018-11-09 | 福特全球技术公司 | The current diverter of ultra high bandwidth |
| CN110579632A (en) * | 2018-06-08 | 2019-12-17 | 共立电气计器株式会社 | Clamp-on sensor and clamp-on ammeter |
-
2010
- 2010-06-30 CN CN2010202427136U patent/CN201697960U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346213A (en) * | 2011-08-09 | 2012-02-08 | 刘睿刚 | Weak current detection sensor |
| CN108776250A (en) * | 2017-03-30 | 2018-11-09 | 福特全球技术公司 | The current diverter of ultra high bandwidth |
| CN110579632A (en) * | 2018-06-08 | 2019-12-17 | 共立电气计器株式会社 | Clamp-on sensor and clamp-on ammeter |
| CN110579632B (en) * | 2018-06-08 | 2024-10-01 | 共立电气计器株式会社 | Clamp-on sensor and clamp-on ammeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20160630 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |