CN204188699U - Transformer iron core grounding current on-line monitoring system - Google Patents
Transformer iron core grounding current on-line monitoring system Download PDFInfo
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- CN204188699U CN204188699U CN201420561735.7U CN201420561735U CN204188699U CN 204188699 U CN204188699 U CN 204188699U CN 201420561735 U CN201420561735 U CN 201420561735U CN 204188699 U CN204188699 U CN 204188699U
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- sample circuit
- iron core
- monitoring system
- core grounding
- line monitoring
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Abstract
Transformer iron core grounding current on-line monitoring system disclosed in the utility model, comprising: current sensor group, the first sample circuit, the second sample circuit, the 3rd sample circuit, the 4th sample circuit, the 5th sample circuit, the 6th sample circuit, single-chip microcomputer, arm processor and server.The transformer iron core grounding current on-line monitoring system that the utility model provides, carries out block sampling by measurement range, and the linearity of block sampling is controlled within 0.02%.
Description
Technical field
The utility model relates to electrical equipment technical field, is specifically related to transformer iron core grounding current on-line monitoring system.
Background technology
Up to now, various types of system for monitoring transformer iron core grounding current has been proposed.But the iron core grounding current monitoring range of this type systematic is little, be milliampere level current range, monitoring accuracy is inconsistent, poor linearity.In this existing transformer iron core grounding current on-line monitoring system, in order to the accuracy of iron core grounding current value can be monitored, to be adjusted the linearity for meeting measuring accuracy by sampling with high precision sensor in a segment limit of transformer iron core grounding current normal value, all occur that the obvious linearity declines in this extraneous measuring accuracy, even if also measuring accuracy requirement cannot be met by the mode of software compensation, on-line monitoring cannot be met and substitute the requirement that prophylactic repair realizes repair based on condition of component.
Utility model content
The transformer iron core grounding current on-line monitoring system that the utility model provides, for solving the problem being improved the linearity by the mode of hard ware measure.
The transformer iron core grounding current on-line monitoring system that the utility model provides, comprising: current sensor group, the first sample circuit, the second sample circuit, the 3rd sample circuit, the 4th sample circuit, the 5th sample circuit, the 6th sample circuit, single-chip microcomputer, arm processor and server;
Described current sensor group is installed on transformer core grounding row, described current sensor group is connected described single-chip microcomputer respectively by the first sample circuit, described second sample circuit, described 3rd sample circuit, described 4th sample circuit, described 5th sample circuit with described 6th sample circuit, described single-chip microcomputer connects described arm processor, and described arm processor connects described server; Described single-chip microcomputer inputs to described arm processor after the analog electrical signal coming from described current sensor group is converted to digital electric signal, and described digital electric signal is delivered to described server by 232 debugging interfaces by described arm processor.
Further, the sample circuit that described first sample circuit adopts the sample circuit of 0.07mA to 0.7mA, described second sample circuit adopts the sample circuit of 0.7mA to 7mA, described 3rd sample circuit adopts the sample circuit of 7mA to 70mA, described 4th sample circuit adopts the sample circuit of 70mA to 100mA, described 5th sample circuit adopts the sample circuit of 100mA to 1000mA, described 6th sample circuit adopts 1000mA to 10000mA.
Further, described current sensor group adopts a circle core-theaded type Zero flux passive sensor.
Further, 232 debugging interfaces of described arm processor are connected with described server by fiber optical transceiver.
Further, the signal output part of described single-chip microcomputer is connected with described arm processor by asynchronous receiving-transmitting transmitter.
Further, the upper surface of described arm processor is provided with temperature monitoring.
Further, described temperature monitoring connects described server and sends alerting signal to described server.
The transformer iron core grounding current on-line monitoring system that the utility model provides, carries out block sampling by measurement range, and the linearity of block sampling is controlled within 0.02%.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings;
Fig. 1 is the circuit structure diagram of the transformer iron core grounding current on-line monitoring system of the utility model embodiment;
Fig. 2 is the circuit structure diagram of the sample circuit of the utility model embodiment.
Embodiment:
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the circuit structure diagram of the transformer iron core grounding current on-line monitoring system of the utility model embodiment, as shown in Figure 1, the transformer iron core grounding current on-line monitoring system that the utility model provides, comprising: for the iron core grounding leakage current of measuring transformer and current sensor group 2, first sample circuit 701, second sample circuit 702, the 3rd sample circuit 703, the 4th sample circuit 704, the 5th sample circuit 705, the 6th sample circuit 706, single-chip microcomputer 3, arm processor 4 and the server 6 for sending iron core grounding leakage current analog signals;
Described current sensor group 2 is installed on the earthing bar of transformer core 1, described current sensor group 2 is connected described single-chip microcomputer 3 respectively by the first sample circuit 701, described second sample circuit 702, described 3rd sample circuit 703, described 4th sample circuit 704, described 5th sample circuit 705 with described 6th sample circuit 706, described single-chip microcomputer 3 connects described arm processor 4, and 232 debugging interfaces of described arm processor 4 connect described server 6 by fiber optical transceiver 5; The analog electrical signal coming from described current sensor group 2 is converted to after digital electric signal by asynchronous receiving-transmitting transmitter (UART by described single-chip microcomputer 3, Universal Asynchronous Receiver/Transmitter) input to described arm processor 4, described digital electric signal is delivered to described server 6 by 232 debugging interfaces by described arm processor 4, server 6 by LCD display display transformer iron core grounding current with time target status information.
Wherein, first sample circuit 701 adopts the sample circuit of 0.07mA to 0.7mA, described second sample circuit 702 adopts the sample circuit of 0.7mA to 7mA, described 3rd sample circuit 703 adopts the sample circuit of 7mA to 70mA, described 4th sample circuit 704 adopts the sample circuit of 70mA to 100mA, described 5th sample circuit 705 adopts the sample circuit of 100mA to 1000mA, described 6th sample circuit 706 adopts the sample circuit of 1000mA to 10000mA, separately measuring accuracy is regulated to each passage, such segmentation limit regulates can go with the accuracy standard of 0.5% to perform.Current sensor group 2 by five-core cable as transmission medium by analog signal transmission to single-chip microcomputer 3, wherein five-core cable includes three core iron core grounding current signal wires and two core power leads, iron core power supply and signal wire have a core to be commonly, so iron core grounding current signal transmits respectively from two cores respectively, one core is connected with the first sample circuit 701, described second sample circuit 702, described 3rd sample circuit 703, and another core is connected with described 4th sample circuit 704, described 5th sample circuit 705, described 6th sample circuit 706.
Fig. 2 is the circuit structure diagram of the sample circuit of the utility model embodiment, as shown in Figure 2, first sample circuit 701, described second sample circuit 702, described 3rd sample circuit 703, described 4th sample circuit 704, the form that described 5th sample circuit 705 and described 6th sample circuit 706 all adopt I/V change-over circuit 7001 (current/voltage converter circuit) to be connected with negative-feedback circuit 7002, I/V change-over circuit 7001 imports the current analog signal received into negative-feedback circuit 7002, to carry out all like amplifications and detection, precision regulates such process of adjusting, ensure that the precision controlling of current measurement value is within 0.2%.
Described current sensor group 2 adopts a circle core-theaded type Zero flux passive sensor.Current sensor group 2 comprises the second current sensor that the first current sensor that range ability is 0.1mA to 70mA and range ability are 1mA to 10A, is respectively used to the separating and measuring of small area analysis and big current.Described first current sensor and described second current sensor all adopt a circle core-theaded type Zero flux passive sensor.232 debugging interfaces refer to serial communication interface, meet the interface standard of the serial data communication that Electronic Industries alliance (EIA) formulates.Fiber optical transceiver employing model is the optical fiber communication chip of 5IP113C; optical fiber communication is as the communication mode of arm processor and server; meet long-distance transmissions transformer iron core grounding current information; improve the anti-interference of communication in transformer station's strong electric field environment, therefore can keep communicating with the satisfied of the transformer iron core grounding current on-line monitoring system background server being arranged on transforming plant protecting room.Single-chip microcomputer 3 adopts Cotex-M3 processor, and single-chip microcomputer 3 is for the zero crossing collection of the current analog signal to sampling channel, AD conversion and communicate.Arm processor 4 is a risc microcontrollers of Acorn computing machine company limited design, and arm processor 4 is for judging, storing and communicating current digital signal medium filtering, overload, and provide 232 debugging interfaces be connected with server.
Further, the upper surface of described arm processor is provided with temperature monitoring, and described temperature monitoring connects described server and sends alerting signal to described server.Temperature monitoring is for detecting the temperature of arm processor, when temperature monitoring detects that temperature exceedes setting threshold value, illustrate that now monitoring means temperature is too high, temperature monitoring sends alerting signal to server, and staff can utilize server closing monitoring means according to alerting signal.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (7)
1. transformer iron core grounding current on-line monitoring system, it is characterized in that, comprising: current sensor group, the first sample circuit, the second sample circuit, the 3rd sample circuit, the 4th sample circuit, the 5th sample circuit, the 6th sample circuit, single-chip microcomputer, arm processor and server;
Described current sensor group is installed on transformer core grounding row, described current sensor group is connected described single-chip microcomputer respectively by the first sample circuit, described second sample circuit, described 3rd sample circuit, described 4th sample circuit, described 5th sample circuit with described 6th sample circuit, described single-chip microcomputer connects described arm processor, and described arm processor connects described server; Described single-chip microcomputer inputs to described arm processor after the analog electrical signal coming from described current sensor group is converted to digital electric signal, and described digital electric signal is delivered to described server by 232 debugging interfaces by described arm processor.
2. transformer iron core grounding current on-line monitoring system according to claim 1, it is characterized in that, the sample circuit that described first sample circuit adopts the sample circuit of 0.07mA to 0.7mA, described second sample circuit adopts the sample circuit of 0.7mA to 7mA, described 3rd sample circuit adopts the sample circuit of 7mA to 70mA, described 4th sample circuit adopts the sample circuit of 70mA to 100mA, described 5th sample circuit adopts the sample circuit of 100mA to 1000mA, described 6th sample circuit adopts 1000mA to 10000mA.
3. transformer iron core grounding current on-line monitoring system according to claim 1, is characterized in that, described current sensor group adopts a circle core-theaded type Zero flux passive sensor.
4. transformer iron core grounding current on-line monitoring system according to claim 1, is characterized in that, 232 debugging interfaces of described arm processor are connected with described server by fiber optical transceiver.
5. transformer iron core grounding current on-line monitoring system according to claim 1, is characterized in that, the signal output part of described single-chip microcomputer is connected with described arm processor by asynchronous receiving-transmitting transmitter.
6. the transformer iron core grounding current on-line monitoring system according to claim 1-5 any one, is characterized in that, the upper surface of described arm processor is provided with temperature monitoring.
7. transformer iron core grounding current on-line monitoring system according to claim 6, is characterized in that, described temperature monitoring connects described server and sends alerting signal to described server.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420561735.7U CN204188699U (en) | 2014-09-27 | 2014-09-27 | Transformer iron core grounding current on-line monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420561735.7U CN204188699U (en) | 2014-09-27 | 2014-09-27 | Transformer iron core grounding current on-line monitoring system |
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| Publication Number | Publication Date |
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| CN204188699U true CN204188699U (en) | 2015-03-04 |
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| CN201420561735.7U Expired - Fee Related CN204188699U (en) | 2014-09-27 | 2014-09-27 | Transformer iron core grounding current on-line monitoring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610358A (en) * | 2020-05-27 | 2020-09-01 | 许昌中科森尼瑞技术有限公司 | Method for calculating residual current by collecting three-phase and zero-sequence currents under three-phase four-wire system |
| CN112951670A (en) * | 2019-12-10 | 2021-06-11 | 华为数字技术（苏州）有限公司 | Circuit breaker with current detection function and communication power supply |
-
2014
- 2014-09-27 CN CN201420561735.7U patent/CN204188699U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112951670A (en) * | 2019-12-10 | 2021-06-11 | 华为数字技术（苏州）有限公司 | Circuit breaker with current detection function and communication power supply |
| CN111610358A (en) * | 2020-05-27 | 2020-09-01 | 许昌中科森尼瑞技术有限公司 | Method for calculating residual current by collecting three-phase and zero-sequence currents under three-phase four-wire system |
| CN111610358B (en) * | 2020-05-27 | 2022-09-27 | 许昌中科森尼瑞技术有限公司 | Method for calculating residual current by collecting three-phase and zero-sequence currents under three-phase four-wire system |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20170927 |