CN103698656B - Non-contact earth leakage fault detection method - Google Patents
Non-contact earth leakage fault detection method Download PDFInfo
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- CN103698656B CN103698656B CN201310651311.XA CN201310651311A CN103698656B CN 103698656 B CN103698656 B CN 103698656B CN 201310651311 A CN201310651311 A CN 201310651311A CN 103698656 B CN103698656 B CN 103698656B
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Abstract
The invention relates to a non-contact earth leakage fault detection method. The method is characterized by comprising the following steps: performing direct magnetic coupling detection on a leakage magnetic field along a line space by utilizing a magnetic field detector, wherein an antenna of the magnetic field detector is a rectangular magnetic coupling coil, the included angle between the opening surface of the rectangular magnetic coupling coil and the trend of a detected line conducting wire is theta, and the long side of the rectangular magnetic coupling coil is parallel to the detected conducting wire; directly indicating the path of an electric leakage current and the position of a fault point by detecting the relative relation between the positions of the antenna and the conducting wire and the intensity analysis; when an earth leakage current is detected, setting the earth leakage current as the first point of a fault, gradually translating the magnetic coupling coil along the deduced trench of the conducting wire to obtain the electric leakage current of any point, so that the distances between positions of the magnetic coupling coil and the conducting wire are the same, and the position at which the maximum value of the electric leakage current is reduced suddenly is the position of the earth leakage of the conducting wire. According to the method, a detection magnetic field serves as a way for detecting the electric leakage, external signals are not required to be injected additionally, and the earth leakage fault is detected without cutting power, so that the method is easy to operate, safe, and high in efficiency.
Description
Technical field
The invention belongs to power system detection of electrical leakage technical field, more particularly to a kind of circuit（Cable）Non-contact grounding leaks
Electric fault detection method.
Background technology
In China's electric power system, the proportion that power distribution network is put is very big, and power distribution network is widely distributed, and wiring is complicated, branch
Lu Duo, the probability that power distribution network occurs earth fault is very high, can account for the 80% of total failare, the power-off condition caused by earth fault
It is widely present.Simultaneously because the technical force of operation of power networks electrician is limited, after there is earth leakage failure, it is impossible to which real looks into
Find earth leakage trouble point or troubleshooting time is more long, it is impossible to recover power transmission in time, the production, life to numerous people are made
Into large effect, the normal operation of safety of electric power system is also have impact on.Traditional earth leakage trouble shoot is by artificial
Line walking, drawing road have a power failure and test or separately add the methods such as input signal lookup earth leakage trouble point, and inefficiency is searched and overflows nothing
Purpose, it is impossible to ensure power grid security reliability service, some lookup methods need to have a power failure in search procedure, influence other clients
Normal electricity consumption, lookup method not science.
The content of the invention
It is an object of the invention to provide a kind of non-contact grounding leak current fault detection method.In three-phase and single phase power supply system
In system, if current phasor and be zero during absence-of-ground leakage failure, concentric circles distributed magnetic field would not be produced, earth leakage occurs
Out-of-balance current can be produced after failure, so as to cause current phasor and be not zero, vector is not zero will produce concentric circles point
Cloth magnetic field.According to above-mentioned principle, non-contact grounding leak current fault detection method of the present invention is：Along magnetic field measurement instrument
To the direct magnetic coupling detection in leakage magnetic field, the antenna of magnetic field measurement instrument is rectangle magnetic coupling coil, rectangle magnetic coupling coil mouthful in road space
It is θ that face and test line wire move towards angle, the side long of rectangle magnetic coupling coil parallel to test line wire, by rectangle magnetic
Coupling coil directly indicates the path and trouble point of leakage current with the relativeness of test line lead location and intensive analysis
Position, when earth leakage stream has been detected, is set at first point of failure, if rectangle magnetic coupling coil coupler center distance is tested
Line conductor is r, and rectangle magnetic coupling coil side long is b, and narrow side is a, and side long is parallel to test line wire, rectangle magnetic coupling coil
It is n circles, transient current is i in test line wire, and leakage current modulus value is in test line wireI 0, then rectangle magnetic coupling coil is defeated
The instantaneous voltage for going out is：
Knowable to induced electromotive force formula, it is the maximum electricity of 0 Du Shike get that angle is moved towards in rectangular opening face with test line wire
Kinetic potential, thus deducibility test line wire trend；Rectangle magnetic coupling coil is progressively put down along the test line wire trend inferred
Move, the leakage current of arbitrfary point can be obtained, make rectangle magnetic coupling coil distance test line wire same distance, it is electric when electric leakage is reached
The position that stream maximum is reduced suddenly, is the position of test line wired earth electric leakage.
Principle of the invention is as shown in Fig. 1, and certain moment single phase power supply line current state is as follows：In figure, L is fire
Line, N is zero line.In 1 position live wire electric current, neutral line current is, then electric current is sweared between live wire and zero line
Measure and be；If live wire and zero line spacing be zero and in the same direction, angle is 0 degree, the current phasor of live wire and zero line andCan be with
Produce concentric circles distribution magnetic field, according to modulus value size can extrapolate Distribution of Magnetic Field rule, intensity.2
At position, live wire electric current is, neutral line current is, such as above-mentioned assumed condition, then two line current vectors are zero, so that will not
Residual current is produced, concentric circular field will not be also produced, be may determine that Lou according to the magnetic field intensity detected at 1 and at 2
Electricity is at 1 and between 2.
The present invention is to detect magnetic field as detection of electrical leakage approach, it is not necessary to external signal is additionally injected, due to being noncontact
Formula is detected, do not have a power failure detection, thus simple to operate, safety, efficiency high.
Brief description of the drawings
Fig. 1 is principle schematic of the invention.
Specific embodiment
In three-phase and single phase power supply system, if current phasor and be zero during absence-of-ground leakage failure, would not produce
Concentric circles distributed magnetic field, out-of-balance current can be produced after there is earth leakage failure, so as to cause current phasor and be not zero, sweared
Measuring and be not zero will produce concentric circles distributed magnetic field.Non-contact grounding leak current fault detection method of the present invention is：Using magnetic
Field detector detects that the antenna of magnetic field measurement instrument is rectangle magnetic coupling coil, square along circuit space to the direct magnetic coupling in leakage magnetic field
It is θ that angle is moved towards in shape magnetic coupling coil mouthful face with test line wire, and the side long of rectangle magnetic coupling coil is led parallel to test line
Line, leakage current is directly indicated by the relativeness and intensive analysis of rectangle magnetic coupling coil and test line lead location
Path and position of failure point, when earth leakage stream has been detected, are set at first point of failure, if rectangle magnetic coupling coil is coupled
Centre distance test line wire is r, and rectangle magnetic coupling coil side long is b, and narrow side is a, and side long is parallel to test line wire,
Rectangle magnetic coupling coil is n circles, and transient current is i in test line wire, and leakage current modulus value is in test line wireI 0, then square
Shape magnetic coupling coil output instantaneous voltage be：
Knowable to induced electromotive force formula, it is the maximum electricity of 0 Du Shike get that angle is moved towards in rectangular opening face with test line wire
Kinetic potential, thus deducibility test line wire trend；Rectangle magnetic coupling coil is progressively put down along the test line wire trend inferred
Move, the leakage current of arbitrfary point can be obtained, make rectangle magnetic coupling coil distance test line wire same distance, it is electric when electric leakage is reached
The position that stream maximum is reduced suddenly, is the position of test line wired earth electric leakage.
Principle of the invention is as illustrated, certain moment single phase power supply line current state is as follows：In figure, L is live wire, N
It is zero line.In 1 position live wire electric current, neutral line current is, then between live wire and zero line current phasor and
For；If live wire and zero line spacing be zero and in the same direction, angle is 0 degree, the current phasor of live wire and zero line andCan produce
Concentric circles distribution magnetic field, according to modulus value size can extrapolate Distribution of Magnetic Field rule, intensity.At 2 positions,
Live wire electric current is, neutral line current is, such as above-mentioned assumed condition, then two line current vectors are zero, so as to will not produce surplus
Aftercurrent, will not also produce concentric circular field, may determine that electric leakage is in 1 according to the magnetic field intensity detected at 1 and at 2
Between place and 2.
If rectangle magnetic coupling coil coupler center is r apart from test line wire, rectangle magnetic coupling coil side long is b, narrow side
It is a, and side long, parallel to test line wire, rectangle magnetic coupling coil is n circles, transient current is i in test line wire,
Leakage current modulus value is in test line wireI 0（Leakage current signal phasor modulus value）, then the instantaneous voltage that rectangle magnetic coupling coil is exported
For:
Knowable to induced electromotive force formula, it is 0 Du Shike get maximum that angle is moved towards in rectangular opening face with test line wire
Electromotive force, thus deducibility test line wire is moved towards, while can go out leakage current mould with backwards calculation by maximum electromotive force
It is worth and is：
Magnetic coupling coil is moved towards into move step by step along the test line wire inferred, the leakage current of arbitrfary point can be obtained,
Make magnetic coupling coil distance test line wire same distance, be tested when the position that leakage current maximum is reduced suddenly is reached
The position of line conductor earth leakage.
Claims (1)
1. a kind of non-contact grounding leak current fault detection method, it is characterised in that：The method is using along magnetic field measurement instrument
To the direct magnetic coupling detection in leakage magnetic field, the antenna of magnetic field measurement instrument is rectangle magnetic coupling coil, rectangle magnetic coupling coil mouthful in road space
It is θ that face and test line wire move towards angle, the side long of rectangle magnetic coupling coil parallel to test line wire, by rectangle magnetic coupling
Coil directly indicates path and the trouble point position of leakage current with the relativeness of test line lead location and intensive analysis
Put, when earth leakage stream has been detected, be set at first point of failure；
If rectangle magnetic coupling coil coupler center is r apart from test line wire, rectangle magnetic coupling coil side long is b, and narrow side is a, and
Side long is n circles parallel to test line wire, rectangle magnetic coupling coil, and transient current is i in test line wire, and test line is led
Leakage current modulus value is in lineI 0, then rectangle magnetic coupling coil output instantaneous voltage be：
Knowable to induced electromotive force formula, it is 0 Du Shike get maximum electromotive force that angle is moved towards in rectangular opening face with test line wire,
Thus deducibility test line wire is moved towards；Rectangle magnetic coupling coil is moved towards into move step by step along the test line wire inferred, can
To obtain the leakage current of arbitrfary point, make rectangle magnetic coupling coil distance test line wire same distance, when reach leakage current most
The position that big value is reduced suddenly, is the position of test line wired earth electric leakage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310651311.XA CN103698656B (en) | 2013-12-06 | 2013-12-06 | Non-contact earth leakage fault detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310651311.XA CN103698656B (en) | 2013-12-06 | 2013-12-06 | Non-contact earth leakage fault detection method |
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| CN103698656B true CN103698656B (en) | 2017-05-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI644112B (en) | 2016-12-14 | 2018-12-11 | 旺玖科技股份有限公司 | Sensor for sensing usage status of electrical device and its associated method |
| CN108205085A (en) * | 2016-12-19 | 2018-06-26 | 旺玖科技股份有限公司 | To sense the sensor of electrical equipment use state and its method for sensing |
| CN109946558B (en) * | 2019-04-08 | 2024-03-26 | 国网山东省电力公司夏津县供电公司 | Leakage fault detector based on magnetic field signal analysis and use method thereof |
| CN114280412A (en) * | 2021-11-22 | 2022-04-05 | 中国地质大学（武汉） | Low-current overhead line ground fault positioning device and fault positioning method |
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| CN100410675C (en) * | 2005-02-03 | 2008-08-13 | 淄博博鸿电气有限公司 | Power cable damage synchronous magnetic field directioning positioning method |
| CN200965562Y (en) * | 2006-08-31 | 2007-10-24 | 中通客车控股股份有限公司 | A non-contact type electric line fault detection device |
| JP5168534B2 (en) * | 2007-02-06 | 2013-03-21 | 東京電力株式会社 | Electric charge type accident investigation device |
| CN102495332B (en) * | 2011-11-25 | 2013-11-13 | 天津市翔晟远电力设备实业有限公司 | System and method for sampling unbalanced current |
| CN102645613B (en) * | 2012-04-25 | 2014-09-24 | 电子科技大学 | Transmission line malfunction positioning method based on non-contact magnetic measurement |
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Inventor after: Li Chaoying Inventor after: Wang Yi Inventor after: Yang Yuming Inventor after: Liu Jian Inventor after: Han Zhenquan Inventor after: Liu Lei Inventor after: Zhang Dejin Inventor after: Han Zhaoru Inventor after: Liu Yang Inventor after: Li Hongmei Inventor before: Li Chaoying Inventor before: Yang Yuming Inventor before: Zhu Zhongbo Inventor before: Liu Jian |
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