CN203561682U - Abnormal overcurrent on-line detection device - Google Patents
Abnormal overcurrent on-line detection device Download PDFInfo
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- CN203561682U CN203561682U CN201320628618.3U CN201320628618U CN203561682U CN 203561682 U CN203561682 U CN 203561682U CN 201320628618 U CN201320628618 U CN 201320628618U CN 203561682 U CN203561682 U CN 203561682U
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Abstract
The utility model relates to an abnormal overcurrent on-line detection device used for a power distribution system. The abnormal overcurrent on-line detection device comprises a current signal collection circuit, an integrated electric parameter detection unit circuit and a single-chip microcomputer system circuit. Two ends of a current transformer of each phase are connected with current signal output ends respectively through a load resistor. Two other load resistors are connected with the current transformers in parallel. Two plastic capacitors are connected between the current signal output ends in parallel. Reference voltage signals are guided out through the connecting node of the two load resistors. Grounding signals are guided out from the connecting node of the two plastic capacitors. The grounding signals are connected with the integrated electric parameter detection circuit correspondingly. The outputs of three-phase current signals are respectively connected to the input end of the integrated electric parameter detection unit circuit, and the output of the integrated electric parameter detection unit circuit is connected with the single-chip microcomputer system circuit. The abnormal overcurrent on-line detection device can achieve the real-time on-line detection and uploading of the abnormal current of the power distribution system, and can play a role in assisting the implementation of the automation control of the power distribution system.
Description
Technical field
The utility model relates to a kind of current sensing means, specifically, has related to a kind of abnormal excess current on-line measuring device for distribution system.
Background technology
So-called abnormal excess current, typically refers to the abnormal excess current that substation transformer overload or three-phase load imbalance cause.Abnormal excess current can have influence on the normal operation of substation transformer.If distributor moves for a long time under this state, will certainly reduce power supply quality, cause power supply unreliable, even can break down and cause device damage rate.
Along with developing rapidly of power industry, distribution system automation is controlled the quickening of process, more and more higher to the monitoring requirement of terminal device, otherwise can not adapt to the progress of distribution system automation control technology at all, affects the construction of intelligent power network.In the past, controller switching equipment had occurred just to know after accident often, cannot accomplish to prevent trouble before it happens.
Therefore how can realize the real time on-line monitoring of various electric parameters and electric equipment operating mode, improve power supply quality, be to be engaged in the constantly problem of thinking of work about electric power person always.
Utility model content
The utility model is not enough for prior art, proposes a kind of abnormal excess current on-line measuring device, and operation characteristic is desirable, and it is economical, convenient to use, and contributes to improve distribution system power supply reliability.
To achieve these goals, the technical scheme that the utility model adopts is:
An abnormal excess current on-line measuring device, comprising: current signal Acquisition Circuit, for the current signal sampling is analyzed, the integrated electric parameter detecting element circuit calculating, microcontroller system circuit, described current signal Acquisition Circuit is by current transformer, and pull-up resistor and shaping capacitance form, and the current transformer two ends of each phase connect current signal output end VP by a pull-up resistor respectively, VN, two other pull-up resistor R3, in parallel with described current transformer after R4 series connection, two shaping capacitance C1, after C2 series connection, be parallel to described current signal output end VP, between VN, from described two pull-up resistor R3, the connected node of R4 is drawn reference voltage signal REFO and is connected integrated electric parameter detecting element circuit corresponding ports, from described two shaping capacitance C1, the connected node of C2 is drawn the earth terminal that ground signalling END connects integrated electric parameter detecting element circuit, three-phase current signal output terminal VP, VN accesses respectively the input end of integrated electrical parameters detection element circuit, the output terminal of described integrated electric parameter detecting element circuit connects microcontroller system circuit.
Described abnormal excess current on-line measuring device, integrated electric parameter detecting element circuit adopts electric parameter measurement integrated circuit (IC) chip, for the current signal sampling is analyzed, is calculated, described microcontroller system circuit is controlled and is calculated abnormal excess current, undercurrent parameter and output to teletransmission unit, and integrated electric parameter detecting element circuit electrical energy pulse is isolated output by light even N1, N2.
Described abnormal excess current on-line measuring device, be connected with teletransmission unit with described microcontroller system circuit, described teletransmission unit adopts bidirectional transmit-receive wireless communication module, single-chip microcomputer is connected with bidirectional transmit-receive wireless communication module by COM port, by described bidirectional transmit-receive wireless communication module, connects wireless communication base station or host computer early warning system.
The useful good effect of utility model:
1, the abnormal excess current on-line measuring device of the utility model, the real-time online of realizing abnormal current that can be comparatively economic, desirable detects and uploads, and it controls the booster action that will play abnormal current on-line monitoring partial function for realizing distribution system automation.
2, the utility model distribution system abnormal current on-line measuring device, design science is reasonable, and signals collecting is stable, and operation is accurately, reliably.
Accompanying drawing explanation
Fig. 1 is current signal Acquisition Circuit schematic diagram described in the utility model;
Fig. 2 is integrated electric parameter detecting element circuit schematic diagram described in the utility model;
Fig. 3 is microcontroller system circuit schematic diagram described in the utility model.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
embodiment 1
Referring to Fig. 1, the abnormal excess current on-line measuring device of the utility model, comprise: current signal Acquisition Circuit, for the current signal sampling is analyzed, the integrated electric parameter detecting element circuit calculating, microcontroller system circuit, described current signal Acquisition Circuit is by current transformer, pull-up resistor and shaping capacitance form, the current transformer two ends of each phase connect current signal output end VP by a pull-up resistor respectively, VN, two other pull-up resistor R3, in parallel with described current transformer after R4 series connection, two shaping capacitance C1, after C2 series connection, be parallel to described current signal output end VP, between VN, from described two pull-up resistor R3, the connected node of R4 is drawn reference voltage signal REFO and is connected integrated electric parameter detecting element circuit corresponding ports, from described two shaping capacitance C1, the connected node of C2 is drawn the earth terminal that ground signalling END connects integrated electric parameter detecting element circuit, three-phase current signal output terminal VP, VN accesses respectively the input end of integrated electrical parameters detection element circuit, the output terminal of described integrated electric parameter detecting element circuit connects microcontroller system circuit.
Described current signal Acquisition Circuit, by A, B, C three-phase alternating current flow through current transformer, pull-up resistor R1, R2, R3, R4, after capacitor C 1, C2 shaping, output is applicable to the current signal that integrated electric parameter detecting unit chip is measured.
embodiment 2
Referring to Fig. 1, Fig. 2, Fig. 3.The abnormal excess current on-line measuring device of the present embodiment, as different from Example 1, integrated electric parameter detecting element circuit adopts electric parameter measurement chip U1 as shown in Figure 2, a current signal Acquisition Circuit wherein road is connected in the output of A phase current mutual inductor and pull-up resistor and is applicable to the current signal V1P that electric energy chip is measured, V1N, two-way is connected to B phase and C phase current mutual inductor and pull-up resistor and takes out B phase in addition, C phase current signal V3P, V3N, V5P, V5N accesses respectively integrated electrical parameters detection unit and measures chip U1, the output of integrated electric parameter detecting element circuit connects microcontroller system circuit, by microcontroller system circuit (as shown in Figure 3), control and calculate abnormal excess current parameter and output to teletransmission unit, electrical energy pulse is by the even N1 of light, N2 isolates output.
Described integrated electric parameter detecting element circuit adopts the electric parameter measurement integrated chip that the current signal sampling can be analyzed, calculated, by described microcontroller system circuit, is controlled and is calculated the electrical quantitys such as abnormal current, undercurrent and outputed to teletransmission unit.
Described abnormal excess current on-line measuring device, be connected with teletransmission unit with microcontroller system circuit, described teletransmission unit adopts bidirectional transmit-receive wireless communication module, single-chip microcomputer is connected with bidirectional transmit-receive wireless communication module by COM port, by described bidirectional transmit-receive wireless communication module, connects wireless communication base station or host computer early warning system.
This distribution system abnormal current on-line measuring device comparatively economy, the desirable real-time online of realizing abnormal current detects and uploads, and it controls the booster action that will play abnormal current on-line monitoring partial function for realizing distribution system automation.
Claims (3)
1. an abnormal excess current on-line measuring device, comprise: current signal Acquisition Circuit, for the current signal sampling is analyzed, the integrated electric parameter detecting element circuit calculating, microcontroller system circuit, it is characterized in that: described current signal Acquisition Circuit is by current transformer, pull-up resistor and shaping capacitance form, the current transformer two ends of each phase connect current signal output end VP by a pull-up resistor respectively, VN, two other pull-up resistor R3, in parallel with described current transformer after R4 series connection, two shaping capacitance C1, after C2 series connection, be parallel to described current signal output end VP, between VN, from described two pull-up resistor R3, the connected node of R4 is drawn reference voltage signal REFO and is connected integrated electric parameter detecting element circuit corresponding ports, from described two shaping capacitance C1, the connected node of C2 is drawn the earth terminal that ground signalling END connects integrated electric parameter detecting element circuit, three-phase current signal output terminal VP, VN accesses respectively the input end of integrated electrical parameters detection element circuit, the output terminal of described integrated electric parameter detecting element circuit connects microcontroller system circuit.
2. abnormal excess current on-line measuring device according to claim 1, is characterized in that: integrated electric parameter detecting element circuit adopts electric parameter measurement integrated circuit (IC) chip, and integrated electric parameter detecting element circuit electrical energy pulse is isolated output by light even N1, N2.
3. abnormal excess current on-line measuring device according to claim 1 and 2, it is characterized in that: be connected with teletransmission unit with described microcontroller system circuit, described teletransmission unit adopts bidirectional transmit-receive wireless communication module, single-chip microcomputer is connected with bidirectional transmit-receive wireless communication module by COM port, by described bidirectional transmit-receive wireless communication module, connects wireless communication base station or host computer early warning system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320628618.3U CN203561682U (en) | 2013-10-12 | 2013-10-12 | Abnormal overcurrent on-line detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320628618.3U CN203561682U (en) | 2013-10-12 | 2013-10-12 | Abnormal overcurrent on-line detection device |
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| Publication Number | Publication Date |
|---|---|
| CN203561682U true CN203561682U (en) | 2014-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320628618.3U Expired - Fee Related CN203561682U (en) | 2013-10-12 | 2013-10-12 | Abnormal overcurrent on-line detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513091A (en) * | 2013-10-12 | 2014-01-15 | 河南开启电力实业有限公司 | Abnormal overcurrent on-line detection device |
-
2013
- 2013-10-12 CN CN201320628618.3U patent/CN203561682U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513091A (en) * | 2013-10-12 | 2014-01-15 | 河南开启电力实业有限公司 | Abnormal overcurrent on-line detection device |
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| Date | Code | Title | Description |
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| 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: 20140423 Termination date: 20161012 |
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| CF01 | Termination of patent right due to non-payment of annual fee |