CN203965558U - Short trouble capture circuit and the fault detector of power cable - Google Patents
Short trouble capture circuit and the fault detector of power cable Download PDFInfo
- Publication number
- CN203965558U CN203965558U CN201420337321.6U CN201420337321U CN203965558U CN 203965558 U CN203965558 U CN 203965558U CN 201420337321 U CN201420337321 U CN 201420337321U CN 203965558 U CN203965558 U CN 203965558U
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- current
- conversion circuit
- short trouble
- power cable
- current conversion
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
- Locating Faults (AREA)
Abstract
The utility model relates to a kind of short trouble capture circuit and fault detector of power cable, and this short trouble capture circuit comprises the first current conversion circuit, in order to the large current signal of the interchange on power cable is converted to the first small voltage signal of direct current; With the second current conversion circuit, in order to the large current signal of the interchange on this power cable is converted to the second small voltage signal of direct current, wherein, this first current conversion circuit comprises the first commutation capacitor, this second current conversion circuit comprises the second commutation capacitor, the capacitance of this second commutation capacitor is less than the capacitance of this first commutation capacitor, thus make the electric current of this second current conversion circuit fall response and the electric current of this first current conversion circuit fall respond different.The utility model can meet the high precision of short trouble detection and the requirement of high-speed response simultaneously.
Description
Technical field
The utility model relates to the checkout equipment of power cable fault, particularly relevant with the testing circuit of the short trouble of power cable.
Background technology
In existing distribution automation system, realizing whether the be short-circuited Real-time Collection of fault and the network distribution device of monitoring of pole line, underground cable is mainly fault detector, fault detector is the device of curent change on a kind of energy monitoring cable, when being short-circuited fault, fault detector can be caught the generation of short circuit event, and by various means of communication notice monitoring personnel.
Fig. 1 shows a kind of structure of existing fault detector, this fault detector mainly comprise current conversion circuit 1 ', microprocessor 2 ' and communication module 3 '.This current conversion circuit 1 ' further comprise current transformer 11, divider resistance 12, rectifier bridge 13 and commutation capacitor 14, they complete the conversion to direct current small voltage signal 16 by the AC great current signal on power cable jointly.Direct current small voltage signal 16 after conversion enter microprocessor 2 ' in analog to digital converter be converted to digital signal, microprocessor 2 ' pass through the storage of digital signal and computing, judge the fault that whether is short-circuited, then by communication module 3 ' spread out of to external unit.There is following problem in this fault detector: when the capacity of commutation capacitor 14 is chosen greatlyr, the ripple of direct current small voltage signal 16 is little, and current detection accuracy is high, but cannot reflect in time falling rapidly of electric current in actual applications; When commutation capacitor 14 choose capacity hour, although can reflect in time falling rapidly of electric current, the ripple of direct current small voltage signal 16 is large, current detection accuracy is low.The Main Basis that detects short trouble due to fault detector is the response of falling of current value and electric current, so scheme of choosing general employing compromise of commutation capacitor 14, to take into account current precision and to fall rate request simultaneously, also can cause thus these two indexs all very common, cannot meet the requirement of high precision and high-speed response.
Utility model content
The technical problems to be solved in the utility model is to avoid can not to meet in prior art the requirement of current detection accuracy that short trouble detects and high-speed response simultaneously and a kind of short trouble capture circuit and fault detector of power cable is provided.
For the above-mentioned technical matters that will solve, the technical solution of the utility model is as follows:
A kind of short trouble capture circuit of power cable is proposed, comprise in order to the AC great current signal on power cable is converted to the first current conversion circuit of direct current the first small voltage signal, also comprise in order to the AC great current signal on this power cable is converted to the second current conversion circuit of direct current the second small voltage signal, wherein, described the first current conversion circuit comprises the first commutation capacitor, described the second current conversion circuit comprises that capacitance is less than the second commutation capacitor of the capacitance of described the first commutation capacitor, described the first current conversion circuit is in parallel with the first current conversion circuit.
Further, described the first current conversion circuit also comprises the first current transformer, the first divider resistance and the first rectifier bridge being electrically connected to successively, and described the first commutation capacitor is electrically connected to the output terminal of this first rectifier bridge.
Further, described the second current conversion circuit also comprises the second current transformer, the second divider resistance and the second rectifier bridge being electrically connected to successively, and described the second commutation capacitor is electrically connected to the output terminal of this second rectifier bridge.
A kind of fault detector of power cable is proposed, comprise short trouble capture circuit in order to the AC great current signal on power cable is converted to direct current small voltage signal, be connected with this short trouble capture circuit in order to according to the microprocessor of small voltage signal judgement short trouble and be connected with this microprocessor in order to the communication module to outside device report short trouble existence according to the judged result of this microprocessor, described short trouble capture circuit is as mentioned above.
Compared with prior art, short trouble capture circuit and the fault detector of power cable of the present utility model have following technique effect: by a special current conversion circuit, meet separately the high-precision requirement of current detecting, by another special current conversion circuit, meet separately the requirement that electric current falls high-speed response, avoided compromise to choose rectified current capacitance and caused the shortcoming that accuracy of detection is low, rate of false alarm is high, having there is higher precision and lower rate of false alarm.
Accompanying drawing explanation
Fig. 1 is the short trouble capture circuit of existing power cable and the structural representation of fault detector.
Fig. 2 is the structural representation of the short trouble capture circuit embodiment of the utility model power cable.
Fig. 3 is the structural representation of the fault detector embodiment of power cable of the present utility model.
Embodiment
In order to describe structure of the present utility model and feature place in detail, hereby lift following preferred embodiment and coordinate accompanying drawing to be described as follows.
Fig. 2 is the structural representation of the short trouble capture circuit embodiment of the utility model power cable.This short trouble capture circuit 1 embodiment comprises: the first current conversion circuit 1a, in order to the large current signal of the interchange on a power cable is converted to the first small voltage signal 16a of direct current; And the second current conversion circuit 1b, in order to the large current signal of the interchange on this power cable is converted to the second small voltage signal 16b of direct current.Described the first current conversion circuit is in parallel with the first current conversion circuit.
Wherein, the electric current of this second current conversion circuit 1b falls response and the electric current of this first current conversion circuit 1a and falls that to respond be different.Short trouble capture circuit 1 falls response different small voltage signal 16a, 16b by the large current signal of the interchange on a power cable is converted to two-way electric current simultaneously, can with the follow-up flexible combination of the fault judging circuits such as microprocessor, meet high precision that short trouble detects and the requirement of high-speed response simultaneously.
Particularly, it is relatively slow that the electric current of this first current conversion circuit 1a falls response, and 16a is comparatively accurate for this first small voltage signal; It is relatively very fast that the electric current of this second current conversion circuit 1b falls response, and 16b is comparatively coarse for this second small voltage signal.Therefore the first current conversion circuit 1a can be used for being responsible for specially, meet high-precision requirement, this second current conversion circuit 1b can be used for being responsible for meeting the requirement of high-speed response.
In the present embodiment, this first current conversion circuit 1a comprises the first current transformer 11a, the first divider resistance 12a, the first rectifier bridge 13a and the first commutation capacitor 14a being electrically connected to successively, and this first current conversion circuit 1a provides the first small voltage signal 16a.
This second current conversion circuit 1b comprises the second current transformer 11b, the second divider resistance 12b, the second rectifier bridge 13b and the second commutation capacitor 14b being electrically connected to successively, and this second current conversion circuit 1b provides the second small voltage signal 16b.
Wherein, the capacitance of this second commutation capacitor 14b is less than the capacitance of this first commutation capacitor 14a.This structure, as long as the capacitance of carrying out simply commutation capacitor 14a, 14b chooses, can make the electric current of this second current conversion circuit 1b fall response and the electric current of this first current conversion circuit 1a fall respond different.
Fig. 3 is the structural representation of the fault detector embodiment of power cable of the present utility model.This fault detector 10 embodiment roughly comprise: short trouble capture circuit 1, the microprocessor 2 being connected with this short trouble capture circuit 1 and the communication module 3 being connected with this microprocessor 2.The output of the two-way current conversion circuit of short trouble capture circuit 1 all enters microprocessor 2, and microprocessor is sampled to two paths of signals simultaneously, by computing failure judgement.
Wherein, this short trouble capture circuit 1 is in order to be converted to the large current signal of the interchange on a power cable small voltage signal of direct current, this microprocessor 2 is in order to judge short trouble according to this small voltage signal, and this communication module 3 is in order to exist to outside device report short trouble according to the judged result of this microprocessor 2.
Particularly, this short trouble capture circuit 1 can provide the first small voltage signal 16a and the second small voltage signal 16b to this microprocessor 2 simultaneously.And then this microprocessor 2 can be realized accurately according to this first small voltage signal 16a the judgement of short trouble; This microprocessor 2 can responsively realize fast according to this second small voltage signal 16b the judgement of short trouble.
Above, be only the preferred embodiment of the utility model, be intended to further illustrate the utility model, but not it is limited.All simple replacements of carrying out according to above-mentioned word and the disclosed content of accompanying drawing, all at the row of the rights protection scope of this patent.
Claims (4)
1. the short trouble capture circuit of a power cable, it is characterized in that: comprise in order to the AC great current signal on power cable is converted to the first current conversion circuit of direct current the first small voltage signal, also comprise in order to the AC great current signal on this power cable is converted to the second current conversion circuit of direct current the second small voltage signal, wherein, described the first current conversion circuit comprises the first commutation capacitor, described the second current conversion circuit comprises that capacitance is less than the second commutation capacitor of the capacitance of described the first commutation capacitor, described the first current conversion circuit is in parallel with the first current conversion circuit.
2. the short trouble capture circuit of power cable according to claim 1, it is characterized in that: described the first current conversion circuit also comprises the first current transformer, the first divider resistance and the first rectifier bridge being electrically connected to successively, and described the first commutation capacitor is electrically connected to the output terminal of this first rectifier bridge.
3. the short trouble capture circuit of power cable according to claim 1, it is characterized in that: described the second current conversion circuit also comprises the second current transformer, the second divider resistance and the second rectifier bridge being electrically connected to successively, and described the second commutation capacitor is electrically connected to the output terminal of this second rectifier bridge.
4. the fault detector of a power cable, it is characterized in that: comprise in order to the AC great current signal on power cable is converted to the short trouble capture circuit of direct current small voltage signal, be connected with this short trouble capture circuit in order to according to the microprocessor of small voltage signal judgement short trouble and be connected with this microprocessor in order to the communication module to outside device report short trouble existence according to the judged result of this microprocessor, wherein, the short trouble capture circuit of the power cable of described short trouble capture circuit as described in claims 1 to 3 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420337321.6U CN203965558U (en) | 2014-06-24 | 2014-06-24 | Short trouble capture circuit and the fault detector of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420337321.6U CN203965558U (en) | 2014-06-24 | 2014-06-24 | Short trouble capture circuit and the fault detector of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203965558U true CN203965558U (en) | 2014-11-26 |
Family
ID=51926122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420337321.6U Expired - Fee Related CN203965558U (en) | 2014-06-24 | 2014-06-24 | Short trouble capture circuit and the fault detector of power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203965558U (en) |
-
2014
- 2014-06-24 CN CN201420337321.6U patent/CN203965558U/en not_active Expired - Fee Related
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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: 20141126 Termination date: 20200624 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |