CN106093543A - Direct current cables leakage current electrification detection system - Google Patents
Direct current cables leakage current electrification detection system Download PDFInfo
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- CN106093543A CN106093543A CN201610398869.5A CN201610398869A CN106093543A CN 106093543 A CN106093543 A CN 106093543A CN 201610398869 A CN201610398869 A CN 201610398869A CN 106093543 A CN106093543 A CN 106093543A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A kind of direct current cables leakage current electrification detection system, including low current sensor, differential amplification and filtration module, A/D module, DSP control circuit, display module and communication module；The current analog signal detected is transmitted to differential amplification and filtration module by low current sensor；Differential amplification and filtration module produce the analogue signal after amplifying and transmit to A/D module；A/D module is that digital data transmission is to DSP control circuit；Digital signal is carried out processing generation control signal and transmission signal by DSP control circuit, and control signal feeds back to differential amplification and filtration module；Transmission signal is shown by DSP control circuit by display module, and transmission signal is carried out communication by communication module by DSP control circuit.The present invention can detect the state of insulation of direct current cables system effectively, reliably, to ensureing that electrical network power supply safety is significant.
Description
Technical field
The present invention relates to cable insulation detection, in particular to a kind of direct current cables leakage current electrification detection system.
Background technology
In order to reduce the greenhouse effect impact on weather, the whole world just at extensive development green energy resource, exploitation solar energy,
Wind energy and tidal power generation etc..Direct current transportation can have wind-power electricity generation, tidal power generation, solar electrical energy generation etc. the power supply of instability
Link up and do not interfere with the quality of power supply level of electrical network with power system.
HVDC transmission line low cost, be lost little, do not have reactive power, easy to connect, be easily controlled and regulate, from
And be widely adopted in long distance powedr transmission.It addition, the working field strength of insulation DC electric cable insulation is high, insulation thickness
Thin, the outside diameter of cable is little, lightweight, manufacture install easily, current-carrying capacity is big, do not have AC magnetic field, have the advantage in terms of environmental protection.Cause
This, direct current high tension transmission cable, as a part indispensable in DC transmission system, is the important topic in high voltage power transmission.
Relatively for AC electric power systems, the research of high voltage DC power cable is delayed.Try at high voltage direct current cable
Testing and insulation diagnosis technical elements, in existing standard, the cable testing project of regulation is few.Thus, lack in the prior art directly
The state of insulation live detection means of stream cable system, accordingly, it would be desirable to according to direct current cables system structure, propose direct current cables and let out
Leakage current electrification detection system, it can detect the state of insulation of direct current cables system effectively, reliably, to ensureing that electrical network is powered
Safety is significant.
Summary of the invention
Present invention aim to for above-mentioned the problems of the prior art, it is provided that a kind of direct current cables leakage current band
Electricity detecting system, it can detect the state of insulation of direct current cables system effectively, reliably, to ensureing that electrical network power supply safety has weight
Want meaning.
For achieving the above object, the direct current cables leakage current electrification detection system designed by the present invention, its special character
It is: include low current sensor, differential amplification and filtration module, A/D module, DSP control circuit, display module and the mould that communicates
Block；The current analog signal detected is transmitted to differential amplification and filtration module by described low current sensor；Described difference is put
Big and filtration module receives current analog signal, is filtered described current analog signal and amplifies the mould produced after amplifying
Intend signal, and transmit to A/D module；Described A/D module receive amplification after analogue signal after be converted to digital signal, and pass
Transport to DSP control circuit；Described DSP control circuit carries out processing generation control signal and transmission signal to digital signal, described
Control signal feeds back to differential amplification and filtration module；Transmission signal is shown by described DSP control circuit by display module
Showing, transmission signal is carried out communication by communication module by described DSP control circuit.
Further, described current analog signal includes direct current cables leakage current analogue signal and geoinduction current-mode
Intend signal；Described low current sensor includes the first low current sensor and the inspection detecting direct current cables leakage current analogue signal
Survey the second low current sensor of geoinduction current analog signal；Described first low current sensor along direct current cables body or
Earth lead axis direction is arranged on direct current cables body or earth lead, and described second low current sensor and first micro-electric current pass
Sensor direction is as one man remotely from the grounding body of cable body.
Further, described low current sensor is open type structure.
Yet further, the detection sensitivity of described low current sensor is microampere order.
In technique scheme, described differential amplification and filtration module, A/D module and DSP control circuit are all by power supply
Module for power supply.
In technique scheme, described low current sensor, differential amplification and filtration module, A/D module, DSP control
Circuit, display module and communication module are integral type structure.
In the direct current cables leakage current electrification detection system designed by the present invention, low current sensor is a kind of permissible
The sensor of detection microampere order precision weak current, is a kind of sensor based on magnetic strength effect, the analogue signal warp of its output
Cross differential amplification and filtration module enters A/D module and is digitally converted, then to DSP control circuit.According to different voltages etc.
The direct current cables circuit of level, by software design patterns differential amplification and the corresponding amplification of filtration module, the micro-electricity of Indirect method
The detection range of flow sensor, thus adapt to the range of different voltage levels direct current cable leakage current.
Differential amplification and filtration module are for carrying out signal amplitude adjustment to the detection signal of low current sensor so that it is defeated
The analogue signal gone out is in the range of the detection range of A/D module.Low current sensor includes that first micro-electric current passes in the present invention
Sensor and the second low current sensor, differential amplification and filtration module are simultaneously to direct current cables leakage current analogue signal and the earth
Faradic current analogue signal carries out differential amplification and filtering interference signals.The design of two low current sensors has preferably inspection
Survey reliability.Above-mentioned two sensor is open type structure, so can install under the conditions of not removing cable run,
And the sensitivity of two sensors is all microampere order.
Described DSP control circuit is a kind of special microprocessor, mainly processes digital signal.Operation principle is
0 received, 1 digital signal are shown, communicate, and automatically adjusts differential amplification and filtering mould according to actual test environment
The analogue signal of block detection, it is possible to realize signal switching on different ranges.DSP control circuit has powerful data and processes
Function and the higher speed of service, can be programmed according to demand, and can quickly locate the mass data of detection by instruction
Reason.
Described power module is for providing power supply for differential amplification and filtration module, A/D module and DSP control circuit.Will
Described low current sensor, differential amplification and filtration module, A/D module, DSP control circuit, display module and communication module set
Being calculated as integral structure, such structure facilitates technical staff to carry out communication and process in detection.Integral type the most of the present invention
Structure be also more suitable for being designed as handheld device, be convenient for carrying.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
In order to be more clearly understood from the technical characteristic of the present invention, purpose and effect, now comparison accompanying drawing describes in detail
The detailed description of the invention of the present invention.
As it is shown in figure 1, direct current cables leakage current electrification detection system of the present invention, by first micro-current sense
Device, the second low current sensor, differential amplification and filtration module, A/D module, DSP control circuit, display module, communication module
Form with power module, and above-mentioned components and parts are integral structure.First low current sensor is along direct current cables body or connects
Ground wire axis direction is arranged on direct current cables body or earth lead, the second low current sensor and the first low current sensor side
It is remotely from the grounding body of cable body to as one man.The direct current cables leakage current that first low current sensor detects
The geoinduction current analog signal that analogue signal and the second low current sensor detect is sent to differential amplification and filtering mould
Block.Described first low current sensor and the second low current sensor are open type structure, it is achieved do not removing cable run
Under the conditions of install, and its detection sensitivity is microampere order.
Described differential amplification and filtration module is unidirectional is connected to A/D module, by putting that differential amplification and filtration module produce
Analogue signal after great is sent to A/D module and is digitally converted.The unidirectional DSP control circuit that is connected to of described A/D module, will
The digitized signal of A/D module output is delivered to DSP control circuit.Described DSP control circuit is unidirectional be connected to display module with
Communication module, the transmission signal of DSP control circuit is shown by display module, and communication module is by the transmission of DSP control circuit
Signal communicates.The control signal that described DSP control circuit produces feeds back to differential amplification and filtration module.
Described power module is differential amplification filtration module, A/D module and DSP control circuit provide power supply.
The detailed process of present invention work is:
(1) the first low current sensor is arranged on direct current cables body or earth lead, detection direct current cables leakage electricity
Flow field simulation signal；Second low current sensor is placed into away from the grounding body of cable body, detects geoinduction current-mode
Intend signal.
(2) by differential amplification and filtration module above-mentioned two-way current analog signal carried out signal amplification and difference is filtered
Ripple；
If above-mentioned two-way current analog signal value range is in the range of the detection range of A/D module, then directly by two-way
Current analog signal is transferred to A/D module by differential amplification and filtration module；If arbitrary current analog signal value range is little
In or more than the detection range ability of A/D module, then be enlarged or reduced A/D module by differential amplification and filtration module
Detection range in the range of after be transferred to A/D module.
(3) by A/D module, the current analog signal received is digitally converted.
(4) by DSP control circuit, the digital signal after converting is transported to display module and communication module, shows
With communicate.
(5) signal shown according to display module send new instruction to DSP control circuit and feed back to differential amplification and
Filtration module.
Above in conjunction with accompanying drawing, embodiments of the invention are described, but the invention is not limited in above-mentioned concrete
Embodiment, above-mentioned detailed description of the invention is only schematic rather than restrictive, those of ordinary skill in the art
Under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, it may also be made that a lot
Form, within these belong to the protection of the present invention.
Claims (7)
1. a direct current cables leakage current electrification detection system, it is characterised in that: include low current sensor, differential amplification and
Filtration module, A/D module, DSP control circuit, display module and communication module；
The current analog signal detected is transmitted to differential amplification and filtration module by described low current sensor；
Described differential amplification and filtration module receive current analog signal, are filtered described current analog signal and amplify
Produce the analogue signal after amplifying, and transmit to A/D module；
Described A/D module receive amplification after analogue signal after be converted to digital signal, and transmit to DSP control circuit；
Digital signal is carried out processing generation control signal and transmission signal by described DSP control circuit, and described control signal is fed back
To differential amplification and filtration module；Transmission signal is shown by described DSP control circuit by display module, and described DSP is controlled
Transmission signal is carried out communication by communication module by circuit processed.
Direct current cables leakage current electrification detection system the most according to claim 1, it is characterised in that: described current analog
Signal includes direct current cables leakage current analogue signal and geoinduction current analog signal；
Described low current sensor includes the first low current sensor and the detection detecting direct current cables leakage current analogue signal
Second low current sensor of geoinduction current analog signal；
Described first low current sensor is arranged on direct current cables body along direct current cables body or earth lead axis direction or connects
On ground wire, described second low current sensor and the first low current sensor direction are as one man remotely from connecing of cable body
On terrain.
Direct current cables leakage current electrification detection system the most according to claim 2, it is characterised in that: described micro-electric current passes
Sensor is open type structure.
Direct current cables leakage current electrification detection system the most according to claim 3, it is characterised in that: described micro-electric current passes
The detection sensitivity of sensor is microampere order.
5. according to the direct current cables leakage current electrification detection system described in any one of Claims 1-4, it is characterised in that: institute
State differential amplification and filtration module, A/D module and DSP control circuit are all powered by power module.
6. according to the direct current cables leakage current electrification detection system described in any one of Claims 1-4, it is characterised in that: institute
Stating low current sensor, differential amplification and filtration module, A/D module, DSP control circuit, display module and communication module is one
Body formula structure.
Direct current cables leakage current electrification detection system the most according to claim 5, it is characterised in that: described micro-electric current passes
Sensor, differential amplification and filtration module, A/D module, DSP control circuit, display module and communication module are integral type structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610398869.5A CN106093543B (en) | 2016-06-07 | 2016-06-07 | Direct current cables leakage current electrification detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610398869.5A CN106093543B (en) | 2016-06-07 | 2016-06-07 | Direct current cables leakage current electrification detection system |
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| CN106093543A true CN106093543A (en) | 2016-11-09 |
| CN106093543B CN106093543B (en) | 2018-09-14 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492870A (en) * | 2017-08-16 | 2017-12-19 | 国网浙江省电力公司杭州供电公司 | A kind of cable leakage detection control apparatus |
| WO2018165970A1 (en) * | 2017-03-17 | 2018-09-20 | 浙江巨磁智能技术有限公司 | Leakage current sensor, and apparatus for monitoring leakage current |
| CN108614184A (en) * | 2018-06-06 | 2018-10-02 | 浙江巨磁智能技术有限公司 | Electric vehicle combined type leakage current sensing device |
| CN108872696A (en) * | 2018-01-09 | 2018-11-23 | 国网山东省电力公司滨州供电公司 | A kind of leakage current circuit measuring high voltage iron tower tester |
| CN109884369A (en) * | 2019-01-28 | 2019-06-14 | 广州炫通电气科技有限公司 | A kind of 8 channel voltage of high-speed, high precision, 8 channel current sampling system |
| CN110146738A (en) * | 2019-06-03 | 2019-08-20 | 上海采日能源科技有限公司 | Electric current measures device and method and energy-storage system |
| CN111679114A (en) * | 2020-04-24 | 2020-09-18 | 国网江苏省电力有限公司营销服务中心 | Direct current on-line measuring device for distributed energy efficiency calibration |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018165970A1 (en) * | 2017-03-17 | 2018-09-20 | 浙江巨磁智能技术有限公司 | Leakage current sensor, and apparatus for monitoring leakage current |
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| CN108614184A (en) * | 2018-06-06 | 2018-10-02 | 浙江巨磁智能技术有限公司 | Electric vehicle combined type leakage current sensing device |
| CN109884369A (en) * | 2019-01-28 | 2019-06-14 | 广州炫通电气科技有限公司 | A kind of 8 channel voltage of high-speed, high precision, 8 channel current sampling system |
| CN110146738A (en) * | 2019-06-03 | 2019-08-20 | 上海采日能源科技有限公司 | Electric current measures device and method and energy-storage system |
| CN111679114A (en) * | 2020-04-24 | 2020-09-18 | 国网江苏省电力有限公司营销服务中心 | Direct current on-line measuring device for distributed energy efficiency calibration |
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| CN106093543B (en) | 2018-09-14 |
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