CN103513154A - Power distribution network electric leakage signal on-line detection device - Google Patents
Power distribution network electric leakage signal on-line detection device Download PDFInfo
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- CN103513154A CN103513154A CN201310474095.6A CN201310474095A CN103513154A CN 103513154 A CN103513154 A CN 103513154A CN 201310474095 A CN201310474095 A CN 201310474095A CN 103513154 A CN103513154 A CN 103513154A
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Abstract
The invention relates to a power distribution network electric leakage signal on-line detection device which comprises current transformers, a single chip microcomputer system circuit and a remote transmission unit. Two annular zero sequence current transformer sets are used. One annular zero sequence current transformer set is connected with a three-phase four-wire power supply wire. The other annular zero sequence current transformer set is connected with a grounding wire. The output ends of the two annular zero sequence current transformer sets are connected into the single chip microcomputer system circuit which is connected with the remote transmission unit through a communication port. The power distribution network electric leakage signal on-line detection device can achieve power distribution network electric leakage signal on-line detection and uploading economically and ideally, and an auxiliary effect of a power distribution network electric leakage signal on-line detection part function can be achieved on power distribution automatic control achieving.
Description
Technical field
The present invention relates to a kind of power distribution network electric leakage signal pick-up unit, especially relate to a kind of power distribution network electric leakage signal on-line measuring device.
Background technology
The proposition of the new problem of power industry intelligent power network, strong promotion developing rapidly of distribution system automation control technology.And distribution system automation is controlled the realization of process, the various aspects that depend on electric system, such as the functional configuration of distribution system basic equipment, the quality of infrastructure signals collecting and transmission etc., be all directly connected to the normal stable or high-quality operation of whole distribution system.
Power distribution network generation leak current fault, is also the problem that often can occur in production reality, once power distribution network generation leak current fault will inevitably have influence on the normal operation of substation transformer, as causes Low-voltage circuit breaker switch Frequent trip, reduces power supply quality.Moreover the leak current fault that the electric leakage of distribution line phase phase line or ground connection are caused, can cause power equipment to produce overheating conventionally, causes generation equipment failure, cause damage sometimes even can to user power utilization equipment.Therefore, if can occur at first, process in time or get rid of in advance line electrical leakage fault before this phenomenon of the failure occurs or in accident, accomplish to prevent trouble before it happens, will inevitably improve distribution system power supply quality and reliability, avoid device damage.
Summary of the invention
The present invention is directed to the problem that background technology proposes, propose a kind of power distribution network electric leakage signal on-line measuring device, can realize and carry out in real time the online detection of distribution line electric leakage.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of power distribution network electric leakage signal on-line measuring device, comprise current transformer, microcontroller system circuit, teletransmission unit, described current transformer adopts two groups of annular zero sequence current mutual inductors, and one group of annular zero sequence current mutual inductor connects three-phase four-wire power line, and another group connects ground wire, the output terminal access microcontroller system circuit of described two groups of annular zero sequence current mutual inductors, described microcontroller system circuit connects teletransmission unit by PORT COM.
Described power distribution network electric leakage signal on-line measuring device, the output signal of two groups of annular zero sequence current mutual inductors accesses A/D modular converter respectively after electric resistance partial pressure, capacitor filtering shaping, and described A/D modular converter output connects microcontroller system circuit.
Described teletransmission unit adopts bidirectional transmit-receive wireless communication module, and 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 invention:
1, power distribution network electric leakage signal on-line measuring device of the present invention, adopt two-way current detection signal, can judge accurately the generation of power distribution network electric leakage signal, realize power distribution network electric leakage signal and detect online and upload, for realizing distribution system automation, control the booster action that will play the online test section of power distribution network electric leakage signal function.
2, power distribution network electric leakage signal on-line measuring device of the present invention, adopts Signal Pretreatment and analog to digital conversion circuit, and signals collecting is accurate, and data are reliable, and operation characteristic is desirable; Line construction is simple, and cost of manufacture is low, economical and practical, easy to use.
Accompanying drawing explanation
Fig. 1 is that power distribution network electric leakage signal on-line measuring device electric leakage signal of the present invention detects schematic diagram;
Fig. 2 is electric leakage signal on-line measuring device signal pre-processing circuit schematic diagram of the present invention;
Fig. 3 is power distribution network electric leakage signal on-line measuring device analog-to-digital conversion module circuit theory diagrams of the present invention; Fig. 4 is power distribution network electric leakage signal on-line measuring device microcontroller system circuit schematic diagram of the present invention.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
embodiment 1
Referring to Fig. 1, power distribution network electric leakage signal on-line measuring device of the present invention, comprise current transformer, microcontroller system circuit, teletransmission unit, described current transformer adopts two groups of annular zero sequence current mutual inductors, and three-phase four-wire power line (distribution transformer secondary output terminal) is passed to annular mutual inductor 101 simultaneously, the output terminal 102 of annular mutual inductor 101 connects microcontroller system circuit, and the neutral line of three-phase four-wire power line is directly connected to ground wire; Annular mutual inductor 201 connects ground wire, the output terminal 202 of annular mutual inductor 201 connects single chip circuit, described microcontroller system circuit connects teletransmission unit by PORT COM, and microcontroller system circuit is controlled and calculated electric leakage signal electrical quantity and output to teletransmission unit.
embodiment 2
Referring to Fig. 1～Fig. 4, the power distribution network electric leakage signal on-line measuring device of the present embodiment, as different from Example 1, adopt filtering shaping circuit to carry out pre-service to mutual inductor output signal, the output signal of two groups of annular zero sequence current mutual inductors accesses A/D modular converter respectively after resistance R 1～R9 dividing potential drop, capacitor C 1～C4 filter shape, and described A/D modular converter output connects microcontroller system circuit.
Described mains by harmonics on-line measuring device, 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 method for making of this power distribution network electric leakage signal on-line measuring device comparatively economy, the desirable power distribution network electric leakage signal of realizing detects online and uploads, and it controls the booster action that will play the online test section of power distribution network electric leakage signal function for realizing distribution system automation.
Claims (3)
1. a power distribution network electric leakage signal on-line measuring device, comprise current transformer, microcontroller system circuit, teletransmission unit, it is characterized in that: described current transformer adopts two groups of annular zero sequence current mutual inductors, one group of annular zero sequence current mutual inductor connects three-phase four-wire power line, and another group connects ground wire, the output terminal access microcontroller system circuit of described two groups of annular zero sequence current mutual inductors, described microcontroller system circuit connects teletransmission unit by PORT COM.
2. power distribution network electric leakage signal on-line measuring device according to claim 1, it is characterized in that: the output signal of two groups of annular zero sequence current mutual inductors accesses A/D modular converter respectively after electric resistance partial pressure, capacitor filtering shaping, described A/D modular converter output connects microcontroller system circuit.
3. mains by harmonics on-line measuring device according to claim 1 and 2, it is characterized in that: 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310474095.6A CN103513154A (en) | 2013-10-12 | 2013-10-12 | Power distribution network electric leakage signal on-line detection device |
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| CN201310474095.6A CN103513154A (en) | 2013-10-12 | 2013-10-12 | Power distribution network electric leakage signal on-line detection device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809017A (en) * | 2014-02-19 | 2014-05-21 | 中国北方车辆研究所 | Detecting device of 900v high voltage leakage current |
| CN103983886A (en) * | 2014-05-08 | 2014-08-13 | 国家电网公司 | Electric leakage detection system applied to rural power distribution network field |
| CN104111370A (en) * | 2014-06-30 | 2014-10-22 | 陕西和硕电气有限公司 | Method for measuring zero-sequence current in three-phase ungrounded system |
| CN106443291A (en) * | 2015-08-04 | 2017-02-22 | 浙江诺尔康神经电子科技股份有限公司 | Electric leakage detecting device and electric leakage detecting method for artificial cochlear implantation prosthesis |
| CN107807263A (en) * | 2017-10-31 | 2018-03-16 | 广东电网有限责任公司中山供电局 | Distribution transformer terminals/electric energy meter of four current measurements |
| CN108089087A (en) * | 2017-12-19 | 2018-05-29 | 北京中交国通智能交通系统技术有限公司 | A kind of electric leakage monitoring and guard method suitable for low-voltage power supply and distribution system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203561715U (en) * | 2013-10-12 | 2014-04-23 | 河南开启电力实业有限公司 | Power distribution network electric leakage signal on-line detection device |
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2013
- 2013-10-12 CN CN201310474095.6A patent/CN103513154A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203561715U (en) * | 2013-10-12 | 2014-04-23 | 河南开启电力实业有限公司 | Power distribution network electric leakage signal on-line detection device |
Non-Patent Citations (1)
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| 赵江波: "用两零序电流互感器的漏电保护原理", 《西山科技》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809017A (en) * | 2014-02-19 | 2014-05-21 | 中国北方车辆研究所 | Detecting device of 900v high voltage leakage current |
| CN103983886A (en) * | 2014-05-08 | 2014-08-13 | 国家电网公司 | Electric leakage detection system applied to rural power distribution network field |
| CN104111370A (en) * | 2014-06-30 | 2014-10-22 | 陕西和硕电气有限公司 | Method for measuring zero-sequence current in three-phase ungrounded system |
| CN106443291A (en) * | 2015-08-04 | 2017-02-22 | 浙江诺尔康神经电子科技股份有限公司 | Electric leakage detecting device and electric leakage detecting method for artificial cochlear implantation prosthesis |
| CN107807263A (en) * | 2017-10-31 | 2018-03-16 | 广东电网有限责任公司中山供电局 | Distribution transformer terminals/electric energy meter of four current measurements |
| CN108089087A (en) * | 2017-12-19 | 2018-05-29 | 北京中交国通智能交通系统技术有限公司 | A kind of electric leakage monitoring and guard method suitable for low-voltage power supply and distribution system |
| CN108089087B (en) * | 2017-12-19 | 2019-11-29 | 北京中交国通智能交通系统技术有限公司 | A kind of electric leakage monitoring and guard method suitable for low-voltage power supply and distribution system |
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Application publication date: 20140115 |