CN204347108U - Based on Luo-coil type current transformer wide region measurement control circuit - Google Patents
Based on Luo-coil type current transformer wide region measurement control circuit Download PDFInfo
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- CN204347108U CN204347108U CN201420778105.5U CN201420778105U CN204347108U CN 204347108 U CN204347108 U CN 204347108U CN 201420778105 U CN201420778105 U CN 201420778105U CN 204347108 U CN204347108 U CN 204347108U
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Abstract
The utility model discloses a kind of based on Luo-coil type current transformer wide region measurement control circuit, the signal output part comprised for being connected to current transformer Luo-coil measures with satisfied different gear primary current the resistance adapter circuit required, this resistance adapter circuit is controlled by many driving switch control loop, and the described signal output part of resistance adapter circuit is connected with the collecting unit of current transformer.This wide region measurement control circuit can realize high-precision rogowski coil under different gear rated primary current, the secondary output simulation small-signal being input to collecting unit is definite value, so when carrying out the measurement of different gear primary current, only need to regulate corresponding many gear control switch, the adapter circuit that coupling is corresponding, just the output valve of collecting unit can be controlled in the scope of its requirement, reach the rated primary current measurement realizing several amperes of even several Wan An trainings with single high-precision rogowski coil.
Description
Technical field
The utility model belongs to intelligent substation field, is specifically related to a kind of based on Luo-coil type electronic current mutual inductor wide region measurement control circuit.
Background technology
Along with the lifting of domestic industry and electricity consumption of resident, net capacity needs constantly to expand with the needs meeting economic development, and the construction of New Generation of Intelligent transformer station obtains and develops more and more widely.In New Generation of Intelligent transformer station, the measuring technique of big current is related to reliability and the stability of protected data, the measuring technique relation of small area analysis is then arrived to credibility and the fairness of continuous data.
Along with the progress of industrial manufacturing technology, adopt advanced winding technique and multilayer screen technology, can strengthen Luo-coil coiling uniformity coefficient and anti-electromagnetic interference capability, simultaneously Luo-coil has iron-core-free, without magnetic hysteresis loss, without advantages such as magnetic saturation, measurement bandwidth, test specification are wide.The manufacturing technology of high-precision rogowski coil and simulation small-signal high fidelity processing techniques, for the wide region measuring technique of single Luo-coil provides realization condition, the Technology Precision based on Luo-coil can meet the demand that intelligent grid is under the new situation measured primary current.
Due to Luo-coil iron-core-free, measurement range does not limit by framework material, when a measurement big current, can realize measuring equipment miniaturization, lightweight.But Luo-coil type current transformer is generally applicable to the measurement of small area analysis signal, its progress of disease precision under small-range condition can reach 0.02 grade, if realize the large specified current measurement of Primary Conductor, just need design match circuit comparatively reliably, control the output valve of collecting unit in its range ability, to reach the object that wide region is measured.
Utility model content
The purpose of this utility model is to provide a kind of based on Luo-coil type current transformer wide region measurement control circuit, to meet the measurement requirement of Luo-coil mutual inductor to different size primary current.
In order to realize above object, the technical scheme that the utility model adopts is: a kind of based on Luo-coil type current transformer wide region measurement control circuit, the signal output part comprised for being connected to current transformer Luo-coil measures with satisfied different gear primary current the resistance adapter circuit required, this resistance adapter circuit is controlled by many driving switch control loop, and the described signal output part of resistance adapter circuit is connected with the collecting unit of current transformer.
Described resistance adapter circuit comprises the match circuit of at least one gear, described match circuit is the electric resistance partial pressure branch road of series connection, this dividing potential drop branch road is used for being connected with the output terminal of Luo-coil, and a divider resistance of dividing potential drop branch road is attempted by the input end of collecting unit by a change-over switch; Each dividing potential drop branch road is serially connected with a gauge tap, this gauge tap and corresponding change-over switch are duplex synchronous switch.
Described resistance adapter circuit comprises the match circuit of at least one gear, and described match circuit comprises the divider resistance being attempted by collecting unit input end by a change-over switch, the main circuit of this resistance adapter circuit is also serially connected with a divider resistance.
Described many driving switch control loop comprises the driving switch more than for being connected between power positive cathode, each stationary contact branch road of this many driving switch is serially connected with respectively the coil of corresponding change-over switch.
The coil of each change-over switch is parallel with a diode.
The utility model one based on Luo-coil type current transformer wide region measurement design on control circuit is controlled by the resistance adapter circuit of many driving switch control loop, high-precision rogowski coil can be realized under different gear rated primary current, the secondary output simulation small-signal being input to collecting unit is definite value, so when carrying out the measurement of different gear primary current, only need to regulate corresponding many gear control switch, the adapter circuit that coupling is corresponding, just the output valve of collecting unit can be controlled in the scope of its requirement, reach the rated primary current measurement realizing several amperes of even several Wan An trainings with single high-precision rogowski coil.
In addition, when verifying standard Luo-coil current transformer, adopt this control circuit without the need to changing first and second wiring of standard Luo-coil, the security of its testing efficiency and test process can be improved.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the current transformer wide region measurement control circuit based on Luo-coil;
Fig. 2 is the circuit diagram of many driving switch control loop;
Fig. 3 is resistance adapter circuit first embodiment circuit theory diagrams;
Fig. 4 is resistance adapter circuit second embodiment circuit theory diagrams;
Fig. 5 is the equivalent schematic diagram of the utility model control circuit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the utility model is described further.
Be illustrated in figure 1 the schematic diagram of the utility model based on Luo-coil type current transformer wide region measurement control circuit, as seen from the figure, the signal output part that this circuit comprises for being connected to current transformer Luo-coil measures with satisfied different gear primary current the resistance adapter circuit required, this resistance adapter circuit is controlled by many driving switch control loop, and the signal output part of this resistance adapter circuit is connected with the collecting unit of current transformer.
As shown in Figure 2, the resistance adapter circuit of the first embodiment comprises the match circuit of at least one gear, resistance adapter circuit comprises the match circuit of at least one gear, each match circuit comprises the divider resistance Rn-1 being attempted by collecting unit input end by a change-over switch QHnA, the main circuit of this resistance adapter circuit is also serially connected with a divider resistance Ra.
As shown in Figure 3, the resistance adapter circuit of the second embodiment comprises the match circuit of at least one gear, this match circuit is electric resistance partial pressure branch road at least in series by resistance Rn-1, Rn-2, this dividing potential drop branch road is used for being connected with the output terminal of Luo-coil, and a divider resistance Rn-1 of dividing potential drop branch road is attempted by the input end of collecting unit by a change-over switch QHnA; Each dividing potential drop branch road is also serially connected with a gauge tap QHnB, this gauge tap QHnB and corresponding change-over switch QHnA are duplex synchronous switch.
As shown in Figure 4, many driving switch control loop of the present embodiment comprises the driving switch K more than for being connected between power positive cathode, each stationary contact branch road of this many driving switch is serially connected with respectively the coil QH1/QH2 of corresponding change-over switch ... / QHn (n measures gear number according to primary current and determines), and the coil of each change-over switch is parallel with a corresponding diode D1/D2 ... / Dn.In addition, this control loop is also serially connected with dividing potential drop protective resistance R1 and R2.
When designing this control circuit, first the resistance of the divider resistance of resistance adapter circuit must be determined, its concrete Computing Principle and process as follows: be described with the embodiment of Fig. 2, by the switching of many driving switch K by direct current 220V plant-grid connection in its loop, make the coil power supply branch road conducting of corresponding QHn, input queued switches voltage signal is to corresponding change-over switch QHnA, make its trigger action, control high-precision rogowski coil signal output terminal, collecting unit input end two parts mate with resistance adapter circuit, when rated primary current changes, by many driving switch control loop, the total output impedance of resistance adapter circuit is also changed by a certain percentage, Luo-coil secondary output simulation small-signal can be realized and maintain certain value.
As shown in Figure 5, if the coil-induced voltage signal of high-precision rogowski is U
in, after high-accuracy resistor network conditioning, export U
out, its value is set to definite value u
0, Ra (being equivalent to the Rn-2 in Fig. 3) and Rx (being equivalent to the Rn-2 in Fig. 2 and Fig. 3) is aviation-grade resistance element, and Rb is collecting unit equivalent resistance, and wherein Ra and Rb is definite value.
According to electromagnetic induction, the coil-induced voltage signal U of high-precision rogowski
inproportional with tested primary current, wherein k is scale-up factor, and I is tested primary current value, namely
U
in＝k·I
Meanwhile, obtained by circuit theory:
Can obtain after arrangement:
According to different primary current I, determine respective resistivity values R
x, high-precision rogowski coil can be made to export analog voltage signal u
0for definite value.
After the utility model wide region measurement design on control circuit completes, many gears relay switch, according to the one-shot measurement electric current of different gear, is linked in direct current 220V electric power loop by many driving switch, connects corresponding stationary contact branch road.If many driving switch cut-in relay QHn, then the inner duplex synchronous switch QHnA of relay and QHnB action close, by in Luo-coil signal and the collecting unit access divider resistance Rn-1 of respective notch and Rn-2 network, as shown in Figure 3, realize the measurement of different gear primary current.
It should be noted that the divider resistance in the present embodiment props up route at least two resistant series formations, multiple resistance can certainly be adopted to realize in modes such as series, parallel, will not enumerate at this.
Above embodiment only understands core concept of the present utility model for helping; the utility model can not be limited with this; for those skilled in the art; every according to thought of the present utility model; the utility model is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection domain of the present utility model.
Claims (5)
1. one kind based on Luo-coil type current transformer wide region measurement control circuit, it is characterized in that: the signal output part comprised for being connected to current transformer Luo-coil measures with satisfied different gear primary current the resistance adapter circuit required, this resistance adapter circuit is controlled by many driving switch control loop, and the described signal output part of resistance adapter circuit is connected with the collecting unit of current transformer.
2. according to claim 1 based on Luo-coil type current transformer wide region measurement control circuit, it is characterized in that: described resistance adapter circuit comprises the match circuit of at least one gear, described match circuit is the electric resistance partial pressure branch road of series connection, this dividing potential drop branch road is used for being connected with the output terminal of Luo-coil, and a divider resistance of dividing potential drop branch road is attempted by the input end of collecting unit by a change-over switch; Each dividing potential drop branch road is serially connected with a gauge tap, this gauge tap and corresponding change-over switch are duplex synchronous switch.
3. according to claim 1 based on Luo-coil type current transformer wide region measurement control circuit, it is characterized in that: described resistance adapter circuit comprises the match circuit of at least one gear, described match circuit comprises the divider resistance being attempted by collecting unit input end by a change-over switch, the main circuit of this resistance adapter circuit is also serially connected with a divider resistance.
4. according to Claims 2 or 3 based on Luo-coil type current transformer wide region measurement control circuit, it is characterized in that: described many driving switch control loop comprises the driving switch more than for being connected between power positive cathode, each stationary contact branch road of this many driving switch being serially connected with respectively the coil of corresponding change-over switch.
5. according to claim 4 based on Luo-coil type current transformer wide region measurement control circuit, it is characterized in that: the coil of each change-over switch is parallel with a diode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420778105.5U CN204347108U (en) | 2014-12-11 | 2014-12-11 | Based on Luo-coil type current transformer wide region measurement control circuit |
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|---|---|---|---|
| CN201420778105.5U CN204347108U (en) | 2014-12-11 | 2014-12-11 | Based on Luo-coil type current transformer wide region measurement control circuit |
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| CN204347108U true CN204347108U (en) | 2015-05-20 |
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| CN201420778105.5U Expired - Fee Related CN204347108U (en) | 2014-12-11 | 2014-12-11 | Based on Luo-coil type current transformer wide region measurement control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291080A (en) * | 2016-08-17 | 2017-01-04 | 云南电网有限责任公司电力科学研究院 | A kind of voltage acquisition Apparatus and method for |
| CN109298370A (en) * | 2018-11-23 | 2019-02-01 | 广州供电局有限公司 | The detection method and device of the characteristic of mutual inductor |
-
2014
- 2014-12-11 CN CN201420778105.5U patent/CN204347108U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291080A (en) * | 2016-08-17 | 2017-01-04 | 云南电网有限责任公司电力科学研究院 | A kind of voltage acquisition Apparatus and method for |
| CN109298370A (en) * | 2018-11-23 | 2019-02-01 | 广州供电局有限公司 | The detection method and device of the characteristic of mutual inductor |
| CN109298370B (en) * | 2018-11-23 | 2021-06-18 | 广东电网有限责任公司广州供电局 | Method and device for detecting characteristics of mutual inductor |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20201211 |
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| CF01 | Termination of patent right due to non-payment of annual fee |