CN109521252A - The detection device of DC leakage current - Google Patents
The detection device of DC leakage current Download PDFInfo
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- CN109521252A CN109521252A CN201811424030.XA CN201811424030A CN109521252A CN 109521252 A CN109521252 A CN 109521252A CN 201811424030 A CN201811424030 A CN 201811424030A CN 109521252 A CN109521252 A CN 109521252A
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- leakage current
- detection device
- electron beam
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- route
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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
Abstract
The invention discloses a kind of detection devices of DC leakage current, comprising: electronic emitter is for generating electron beam；The electronics in electron beam that electron accelerator is used to generate electronic emitter accelerates, and electronics is made to obtain kinetic energy；Electromagnetic deflection coil includes magnetic core and the insulated conductor that is wound on magnetic core, and magnetic core has air gap, and insulated conductor has input terminal and output end, electromagnetic deflection coil is serially connected in route to be measured according to input terminal and output end；The electronics that electronic generator generates passes through the air gap of electromagnetic deflection coil, beats on fluorescent display screen.The position according to image on fluorescent display screen may be implemented in the detection device of DC leakage current provided in this embodiment, intuitively judges the size of leakage current；Line powering quality is not influenced, and facilitates detection when the number of branches of direct current system are more yet.
Description
Technical field
The present invention relates to a kind of detection device, in particular to a kind of detection device of DC leakage current.
Background technique
As electric system is using more and more extensive, the safety of electric system becomes particularly important.
DC power supply device in electric system, as electric equipments emergency power supply and control signal power source, be
One very huge multiple-limb supply network.The reliability service of DC power system is the technology base for ensureing electric power reliability service
Plinth, when the dielectric level between the positive or negative pole of direct current system and the earth is lower than a certain specified value, claims in direct current system
For DC system grounding.Direct current system has a very wide distribution, and exposed parts are more, when receiving the corrosion of dust moisture, makes certain insulation
Weak original part insulation reduces or insulation breakdown causes DC earthing.Endangering in DC earthing biggish is two points ground fault, may
Ground short circuit is constituted, causes relay to be shorted, causes major accident.In addition, current leakage may also lead to wound caused by electric shock
Harmful or dead, therefore, the detection of leakage current becomes one of the safety factor for influencing electric system.
Currently, the detection method about DC system earth fault mainly passes through bridge balance method.Bridge balance principle is just
It is artificial one resistance bridge of access between positive and negative bus, allows itself and direct current system positive and negative busbar insulation against ground resistance group
At an electric bridge, electric bridge using ground as bridge intermediate point, by connect the relay between two resistance bridges to determine whether in the presence of
Insulation fault.When system does not normally have insulation fault, DC bus positive and negative anodes insulation against ground resistance is equal with resistance value, and electric bridge is flat
It weighs, the small out-of-balance current in relay only less than setting valve flows through, and device does not issue alarm signal；And works as and insulate
When failure, positive and negative busbar insulation against ground resistance unevenly declines or one end is directly grounded, electric bridge disequilibrium, at this time in relay
It has biggish out-of-balance current to flow through, if this electric current is bigger than setting valve, device will issue insulation alarm by relay
Signal indicates that insulation fault occurs.
Report is issued it was found by the inventors of the present invention that the detection of bridge balance method is only able to detect out-of-balance current based on this
It is alert, abort situation cannot be directly determined, the detection to fault branch is usually realized by open line method, will affect direct current system
Electricity supply.When demanding more than the number of branches of direct current system or to power supply reliability, bridge balance method often can not
Meet detection demand.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of detection devices of DC leakage current, so that existing open line method be overcome to detect
The shortcomings that will affect the electricity supply of direct current system.
The present invention provides a kind of detection device of DC leakage current, and the detection device includes: that electronic emitter, electronics add
Fast device, electromagnetic deflection coil and fluorescent display screen；The electronic emitter is for generating electron beam；The electron accelerator is used
Electronics in the electron beam generated to the electronic emitter accelerates, and the electronics is made to obtain kinetic energy；The electromagnetic deflection line
Circle includes magnetic core and the insulated conductor being wound on magnetic core, and the magnetic core has air gap, and the insulated conductor has input terminal
And output end, the electromagnetic deflection coil is serially connected in the route to be measured according to the input terminal and output end；The electricity
Son passes through at the air gap of the electromagnetic deflection coil, bombards on the fluorescent display screen.
In one possible implementation, when the route to be measured is DC earthing branch, the insulated conductor is
The electromagnetic deflection coil is serially connected in the DC earthing according to the input terminal of single open traverse and output end by single open traverse
In branch.
In one possible implementation, when the route to be measured is power supply major loop, the insulated conductor is double
Open traverse, the canoe of double open traverses, the number of turns are all the same.
In one possible implementation, double open traverses have electrode input end, cathode output end, cathode input
End, cathode output end, the electrode input end of double open traverses are connected with positive pole, and the cathode output end and power supply are negative
Pole is connected, and cathode output end, the negative input of the conducting wire are connected with the input of load, output end respectively.
In one possible implementation, the magnetic core of the electromagnetic deflection coil is described perpendicular to horizontally arranged
The magnetic direction of air gap is vertical direction.
In one possible implementation, when leakage current is not present in the route to be measured, the electron beam is described
Point or vertical line are formed on fluorescent display screen；When the route to be measured is there are when leakage current, the electron beam is in the fluorescence
Point or vertical line are formed on display screen and the offset of horizontal direction occurs when leakage current is not present；Electron beam horizontal direction it is inclined
Moving distance is deflection distance.
In one possible implementation, the magnetic core of the electromagnetic deflection coil and horizontal direction parallel are arranged, described
The magnetic direction of air gap is perpendicular to paper direction.
In one possible implementation, when leakage current is not present in the route to be measured, the electron beam is described
The line of point or level is formed on fluorescent display screen；When the route to be measured is there are when leakage current, the electron beam is in the fluorescence
The line of point or level is formed on display screen and the deflection of vertical direction occurs when leakage current is not present；Electron beam vertical direction it is inclined
Moving distance is deflection distance.
In one possible implementation, electron beam described in the leakage current of the route to be measured is aobvious in the fluorescence
Deflection distance in display screen is directly proportional.
Compared with prior art, the invention has the following beneficial effects: the detections of DC leakage current provided in this embodiment
The insulated conductor that device includes magnetic core by setting electromagnetic deflection coil and is wound on magnetic core, the magnetic core have air gap,
The insulated conductor has input terminal and output end, is serially connected in the electromagnetic deflection coil according to the input terminal and output end
In the route to be measured；The electronics that electronic generator generates passes through at the air gap of the electromagnetic deflection coil, bombards described glimmering
On light display screen.The detection device of DC leakage current provided in this embodiment may be implemented according to image on fluorescent display screen
Position intuitively judges the size of leakage current；Line powering quality is not influenced, and when the number of branches of direct current system are more
Facilitate detection.
Also, any electrical link is not present with system under test (SUT), it is (such as low without any auxiliary signal is injected to direct current system
Frequency AC signal), any influence will not be generated to the operation of direct current system, realize Noninvasive testing；It leaks electricity for high frequency
Accurately it can detect and protect；Detection circuit realization is relatively easy, and very useful when searching fault branch, sexual valence is relatively high.
Detailed description of the invention
Fig. 1 is a kind of detection device of DC leakage current provided in an embodiment of the present invention；
The detection device that Fig. 2 is route to be measured provided in an embodiment of the present invention when being power supply major loop；
The detection device that Fig. 3 is route to be measured provided in an embodiment of the present invention when being DC earthing branch；
Fig. 4 is the display schematic diagram of leakage current on the fluorescent display screen of the embodiment of the present invention；
Fig. 5 is the magnetic deflection schematic diagram that the magnetic direction of the embodiment of the present invention is vertical paper direction.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
Embodiment one
Fig. 1 is a kind of detection device of DC leakage current provided in an embodiment of the present invention, and the detection device includes: electronics
Transmitter 1, electron accelerator 2, electromagnetic deflection coil 3 and fluorescent display screen 4；
The electronic emitter 1 is for generating electron beam.
Specifically, electronic generator is responsible for generating charged particle, in electronic generator, after filament electrified regulation, and surface
A large amount of thermoelectron is generated, filament must select the material that fusing point is high, resistivity is big, usually made of tungsten wire, by strong
After electric current, filament is heated to 1,000 degree or more.The material that cathode must select work function low, the outer layer electricity of cathode surface atom
Son after the excitation by certain thermal energy or electric energy, can be detached from nuclear constraint and get over errant and become free electron.
The electronics in electron beam that the electron accelerator 2 is used to generate the electronic emitter accelerates, and makes the electricity
Son obtains kinetic energy.
The electromagnetic deflection coil 3 includes magnetic core and the insulated conductor being wound on magnetic core, and the magnetic core has certain
Air gap, the insulated conductor has input terminal and output end, according to the input terminal and output end by the electromagnetic deflection line
Circle is serially connected in the route to be measured.
It is to be understood that route to be measured is the winding of electromagnetic deflection coil, it is wound on detection magnetic core.Route to be measured and leakage
Electric detection means is non-electrical connection.
The electronics passes through at the air gap of the electromagnetic deflection coil 3, bombards on the fluorescent display screen 4.
Specifically, charged particle obtains kinetic energy and is accelerated after electron accelerator pole plate, the conducting wire of electromagnetic deflection coil
Using common mode coiling, magnetic core has air gap, after electric current has flowed through load, returns from power supply negative terminal.If detection branch is sent out
When raw leak current fault, a leakage current can be generated to the earth, form the electricity directly proportional to leakage current numerical value at the air gap of magnetic core
Magnetic field B, and then change the motion profile of charged particle, it beats and forms displacement in fluorescent screen Shi Huiyu origin, it can in real time accurately
React the leakage current condition in DC circuit.
The detection device of DC leakage current provided in this embodiment as a result, includes magnetic core by setting electromagnetic deflection coil 3
And it is wound on the insulated conductor on magnetic core, the magnetic core has air gap, and the insulated conductor has input terminal and output end, root
The electromagnetic deflection coil is serially connected in the route to be measured according to the input terminal and output end；What electronic generator 1 generated
Electronics passes through at the air gap of the electromagnetic deflection coil 3, bombards on the fluorescent display screen.Leakage current provided in this embodiment
Detection device, the position according to image on fluorescent display screen may be implemented, intuitively judge the size of leakage current；Do not influence line
Road power supply quality, and also facilitate detection when the number of branches of direct current system are more.
Also, any electrical link is not present with system under test (SUT), it is (such as low without any auxiliary signal is injected to direct current system
Frequency AC signal), any influence will not be generated to the operation of direct current system, realize Noninvasive testing；It leaks electricity for high frequency
Accurately it can detect and protect；Detection circuit realization is relatively easy, and very useful when searching fault branch, sexual valence is relatively high.
Embodiment two
The present embodiment on the basis of example 1, for two kinds of routes to be measured, carries out electromagnetic deflection coil further
It limits.
In one possible implementation, Fig. 2 is route to be measured provided in an embodiment of the present invention when being power supply major loop
Detection device, referring to Fig. 2, the insulated conductor is double open traverses, described when the route to be measured is power supply major loop
The canoe of double open traverses, the number of turns are all the same.
Specifically, double open traverses have electrode input end a, cathode output end c, negative input d, cathode output end
The electrode input end a of b, double open traverses are connected with positive pole, and the cathode output end b is connected with power cathode,
Cathode output end c, the negative input d of the conducting wire are connected with the input of load, output end respectively.
If leak current fault is not present in detection branch, the size of current flowed out from power positive end and the electricity for flowing into negative terminal power supply
Flow it is equal in magnitude, contrary, when across sensor two electric currents generate magnetic field cancel out each other, electromagnetic deflection coil is without magnetic field
It generates, particle is beaten on fluorescent screen along original direction of motion, forms fixed bright spot.If leak current fault occurs for detection branch,
A leakage current can be generated to the earth by positive or cathode, the electric current and inflow power supply negative terminal flowed out at this time from power positive end
Electric current can exist a current differential, across two electric currents of electromagnetic deflection coil generate magnetic field can not cancel out each other, in gas
The electromagnetic field B directly proportional to leakage current numerical value is formed at gap, and then changes the motion profile of charged particle, plays the meeting in fluorescent screen
It is formed and is displaced with origin, can accurately react the leakage current condition in DC circuit in real time.It should be noted that the present embodiment
The insulated conductor of middle electromagnetic deflection coil defines electrode input end a, anode to describe the connection relationship with route to be measured
Output end c, negative input d, cathode output end b, cathode output end b can also be connected with positive pole, but at this point,
The cathode output end a is connected with power cathode, cathode output end d, the negative input c of the conducting wire respectively with load
Input, output end are connected.
In one possible implementation, it is DC earthing branch that Fig. 3, which is route to be measured provided in an embodiment of the present invention,
When detection device, referring to Fig. 3, the insulated conductor is single open traverse when the route to be measured is DC earthing branch,
The electromagnetic deflection coil is serially connected in the DC earthing branch according to the input terminal e of single open traverse and Ausgang.
It is believed that ground wire branch is the winding of electromagnetic deflection coil, it is wound on detection magnetic core.Under normal circumstances, directly
It flows and electric current is not present in ground branch, therefore input, output end is just for the sake of differentiation.
Under normal circumstances, electric current is not present in DC earthing branch, when DC earthing branch generates leakage current, electromagnetism is inclined
Switch coil forms the electromagnetic field B directly proportional to leakage current numerical value at air gap, and then changes the motion profile of charged particle, beats
Fluorescent screen Shi Huiyu origin forms displacement, can accurately react the leakage current condition in DC circuit in real time.
The detection device of DC leakage current provided in this embodiment as a result, may be implemented can a detection branch direct current connect
Earth signal is not influenced by system distribution capacity.
Embodiment three
In the present embodiment, on the basis of the above embodiments, the setting direction of electromagnetic deflection coil is further limited
It is fixed.
In one possible implementation, Fig. 2, Fig. 3 are please referred to, the magnetic core of the electromagnetic deflection coil is perpendicular to level
Direction setting, the magnetic direction of the air gap are vertical direction.
When leakage current is not present in the route to be measured, the electron beam forms a little or vertical on the fluorescent display screen
Line.
Specifically, when not applying horizontal magnetic field, electron beam is formed a little on the fluorescent display screen.For watcher
Just, can at the air gap of electromagnetic deflection coil applying horizontal magnetic field, at this time be not present leakage current when, the electron beam is described
Vertical line is formed on fluorescent display screen.
When the route to be measured is there are when leakage current, the electron beam is formed a little or vertically on the fluorescent display screen
Line and the offset that horizontal direction occurs when leakage current is not present；The offset distance of electron beam horizontal direction is deflection distance.
In one possible implementation, the magnetic core of the electromagnetic deflection coil and horizontal direction parallel are arranged, described
The magnetic direction of air gap is perpendicular to paper direction (attached drawing is not shown).
When leakage current is not present in the route to be measured, the electron beam forms a little or horizontal on the fluorescent display screen
Line.
Specifically, when not applying horizontal magnetic field, electron beam is formed a little on the fluorescent display screen.For watcher
Just, can at the air gap of electromagnetic deflection coil outside plus vertical magnetic field, when leakage current being not present at this time, the electron beam is described
Horizontal line is formed on fluorescent display screen.
Fig. 4 is the display schematic diagram of leakage current on the fluorescent display screen of the embodiment of the present invention, referring to Fig. 4, when it is described to
Survey line road there are when leakage current, the electron beam formed on the fluorescent display screen a little or horizontal line with there is no leakage currents
The deflection of Shi Fasheng vertical direction, the offset distance of electron beam vertical direction are deflection distance.
Example IV
In the present embodiment, the size of leakage current is further analyzed.Fig. 5 is that the magnetic direction of the embodiment of the present invention is
The magnetic deflection schematic diagram in vertical paper direction, referring to Fig. 5, the uniform magnetic field formed at electromagnetic deflection coil air gap, by adding
The electronics e of speed, enters magnetic field B with speed v, by the effect of Lorentz force, (direction of Lorentz force is according to leakage along the Z direction
The locality that electric current occurs is different) it deflects, deflection radius R are as follows:
It is Φ that electronics, which leaves magnetic field and Z axis angle, are as follows:
Deflection distance S are as follows:
Wherein, L is the lateral shift distance that fluorescent screen goes out magnetic field to electronics, and l is lateral shift of the electronics in magnetic field
Distance.
Electron accelerator voltage is V, then having:
Wherein, e is the quantity of electric charge of electronics.
And: B=K1I (5)
Wherein, K1For constant, I is leakage current value.
According to calculating, remaining parameter is definite value in formula, then formula can simplify are as follows:
Wherein, K is the constant value simplified after publicity.
Therefore, the leakage current of the route to be measured and deflection distance of the electron beam on the fluorescent display screen
It is directly proportional.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (9)
1. a kind of detection device of DC leakage current, which is characterized in that the detection device includes:
Electronic emitter, electron accelerator, electromagnetic deflection coil and fluorescent display screen；
The electronic emitter is for generating electron beam；
The electronics in electron beam that the electron accelerator is used to generate the electronic emitter accelerates, and obtains the electronics
Kinetic energy；
The electromagnetic deflection coil includes magnetic core and the insulated conductor that is wound on magnetic core, and the magnetic core has air gap, described
Insulated conductor has input terminal and output end, is serially connected in the electromagnetic deflection coil according to the input terminal and output end described
In route to be measured；
The electronics passes through at the air gap of the electromagnetic deflection coil, bombards on the fluorescent display screen.
2. detection device according to claim 1, which is characterized in that described when the route to be measured is ground branch
Insulated conductor is single open traverse, and the electromagnetic deflection coil is serially connected in institute according to the input terminal of single open traverse and output end
It states in ground branch.
3. detection device according to claim 1, which is characterized in that when the route to be measured is power supply major loop, institute
Stating insulated conductor is double open traverses, and the canoe of double open traverses, the number of turns are all the same.
4. detection device according to claim 3, which is characterized in that double open traverses have electrode input end, anode
The electrode input end of output end, negative input, cathode output end, double open traverses is connected with positive pole, described negative
Pole output end is connected with power cathode, the cathode output end of the conducting wire, negative input respectively with the input of load, output
End is connected.
5. detection device according to claim 1, which is characterized in that the magnetic core of the electromagnetic deflection coil is perpendicular to level
Direction setting, the magnetic direction of the air gap are vertical direction.
6. detection device according to claim 5, which is characterized in that
When leakage current is not present in the route to be measured, the electron beam is formed a little or vertically on the fluorescent display screen
Line；
When the route to be measured is there are when leakage current, the electron beam formed on the fluorescent display screen a little or vertical line with
There is no the offsets that horizontal direction occurs when leakage current；
The offset distance of electron beam horizontal direction is deflection distance.
7. detection device according to claim 1, which is characterized in that the magnetic core and horizontal direction of the electromagnetic deflection coil
It is arranged in parallel, the magnetic direction of the air gap is perpendicular to paper direction.
8. detection device according to claim 7, which is characterized in that
When the route to be measured be not present leakage current when, the electron beam is formed on the fluorescent display screen a little or level
Line；
When the route to be measured is there are when leakage current, the electron beam formed on the fluorescent display screen a little or horizontal line with
There is no the deflections that vertical direction occurs when leakage current；
The offset distance of electron beam vertical direction is deflection distance.
9. the detection device according to claim 6 or 8, which is characterized in that the leakage current of the route to be measured and institute
It is directly proportional to state deflection distance of the electron beam on the fluorescent display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811424030.XA CN109521252A (en) | 2018-11-27 | 2018-11-27 | The detection device of DC leakage current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811424030.XA CN109521252A (en) | 2018-11-27 | 2018-11-27 | The detection device of DC leakage current |
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Family
ID=65779517
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| CN201811424030.XA Pending CN109521252A (en) | 2018-11-27 | 2018-11-27 | The detection device of DC leakage current |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10895592B2 (en) | 2017-03-24 | 2021-01-19 | Rosemount Aerospace Inc. | Probe heater remaining useful life determination |
| US10914777B2 (en) | 2017-03-24 | 2021-02-09 | Rosemount Aerospace Inc. | Probe heater remaining useful life determination |
| US10962580B2 (en) | 2018-12-14 | 2021-03-30 | Rosemount Aerospace Inc. | Electric arc detection for probe heater PHM and prediction of remaining useful life |
| US11061080B2 (en) | 2018-12-14 | 2021-07-13 | Rosemount Aerospace Inc. | Real time operational leakage current measurement for probe heater PHM and prediction of remaining useful life |
| US11060992B2 (en) | 2017-03-24 | 2021-07-13 | Rosemount Aerospace Inc. | Probe heater remaining useful life determination |
| US11293995B2 (en) | 2020-03-23 | 2022-04-05 | Rosemount Aerospace Inc. | Differential leakage current measurement for heater health monitoring |
| US11472562B2 (en) | 2019-06-14 | 2022-10-18 | Rosemount Aerospace Inc. | Health monitoring of an electrical heater of an air data probe |
| US11630140B2 (en) | 2020-04-22 | 2023-04-18 | Rosemount Aerospace Inc. | Prognostic health monitoring for heater |
| US11639954B2 (en) | 2019-05-29 | 2023-05-02 | Rosemount Aerospace Inc. | Differential leakage current measurement for heater health monitoring |
| US11930563B2 (en) | 2019-09-16 | 2024-03-12 | Rosemount Aerospace Inc. | Monitoring and extending heater life through power supply polarity switching |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10895592B2 (en) | 2017-03-24 | 2021-01-19 | Rosemount Aerospace Inc. | Probe heater remaining useful life determination |
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| US11061080B2 (en) | 2018-12-14 | 2021-07-13 | Rosemount Aerospace Inc. | Real time operational leakage current measurement for probe heater PHM and prediction of remaining useful life |
| US11639954B2 (en) | 2019-05-29 | 2023-05-02 | Rosemount Aerospace Inc. | Differential leakage current measurement for heater health monitoring |
| US11472562B2 (en) | 2019-06-14 | 2022-10-18 | Rosemount Aerospace Inc. | Health monitoring of an electrical heater of an air data probe |
| US11930563B2 (en) | 2019-09-16 | 2024-03-12 | Rosemount Aerospace Inc. | Monitoring and extending heater life through power supply polarity switching |
| US11293995B2 (en) | 2020-03-23 | 2022-04-05 | Rosemount Aerospace Inc. | Differential leakage current measurement for heater health monitoring |
| US11630140B2 (en) | 2020-04-22 | 2023-04-18 | Rosemount Aerospace Inc. | Prognostic health monitoring for heater |
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