CN109901005A - Shorted-turn fault detection method, system and the application of axial magnetic field difference - Google Patents
Shorted-turn fault detection method, system and the application of axial magnetic field difference Download PDFInfo
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Abstract
Present disclose provides shorted-turn fault detection method, system and the application of a kind of axial magnetic field difference, measurement point is selected in the vertex up and down of the axial centre axis of dry-type air-core reactor, and measurement point places magnetic field measuring instrument.Magnetic field strength difference when real-time measurement reactor is run between upper vertex and lower vertex is simultaneously compared with threshold value, judges whether reactor turn-to-turn insulation structure is intact.Whole process and reactor without electrical connection, do not influence reactor normal operation, and can real-time monitoring reactor turn-to-turn insulation state, have real-time.
Description
Technical field
This disclosure relates to a kind of shorted-turn fault detection method, system and the application of axial magnetic field difference.
Background technique
Only there is provided background technical informations relevant to the disclosure for the statement of this part, it is not necessary to so constitute first skill
Art.
Dry-type air-core reactor has that price is low, structure is simple, light weight, reactance using more encapsulatings and around structural shape
It is worth the advantages such as invariable, is used widely in the power system.But dry-type air-core reactor burnout failure is big in recent years
There are generation in some areas, affect power network safety operation.Compared with the other equipment of identical voltage class, occur
The probability of failure is much higher by other equipment, and 60% or more failure is caused by turn-to-turn short circuit.Therefore it probes into
A kind of with higher sensitivity hollow reactor interturn short circuit fault monitoring method, reactor occur shorted-turn fault initial stage and
Alarm, cut off from system in time it is very necessary.
Understand according to inventor, solution to the problems described above is tried hard to presently, there are some, such as magnetic flux leakage detection method, high frequency vibrating
Energy absorption or pulse voltage, lightning impulse etc. are swung, still, for these methods during being detected, there are the scope of applications
Narrow, detection process is complicated, degree of difficulty is big, and detection effect is bad, and input cost is high, can damage to reactor itself, reduces
The problems such as service efficiency of reactor script.
Summary of the invention
The disclosure to solve the above-mentioned problems, propose a kind of axial magnetic field difference shorted-turn fault detection method,
System and application, the disclosure have no electrical connection in the detection process, with reactor itself, will not influence property of reactor itself
Can, and input cost is effectively reduced, while detecting shorted-turn fault using axial magnetic field differential technique, expand reactor
Detection range.
According to some embodiments, the disclosure is adopted the following technical scheme that
A kind of shorted-turn fault detection method of axial magnetic field difference, comprising the following steps:
At least magnetic field on detection reactor axial vertex and middle part up and down；
Vertex axial direction magnetic field difference value up and down is calculated, if the difference is greater than first threshold, it is short to determine that turn-to-turn occurs for reactor
Road failure if it is determines that turn-to-turn short circuit occurs for reactor otherwise, it determines whether the magnetic field of middle section is greater than second threshold
Failure, otherwise, it is determined that reactor is without shorted-turn fault.
The above process is judged by twice threshold, so that it may determine shorted-turn fault, detection process is simple, and accurate
Rate is higher.
It is limited as further, is based on finite element analysis, determine reactor steady-state operation and shorted-turn fault occurs
When Distribution of Magnetic Field situation.
The finite element analysis process is the base of the discrete principle and Piecewise polynomial difference value principle in calculating in conjunction with numerical value
On plinth, using maxwell equation group as starting point, the magnetic field that air reactor generates is become discrete from continuous physical quantity
Digital quantity, based on several freedom degrees of limited quantity unit, approximate simulation goes out the situation on unlimited and continuous region,
Constantly approach actual value.
By the analysis of finite element, it can guarantee that detection process basis can constantly approach actual value, to a certain extent
It ensure that accuracy.
It is limited as further, when reactor steady-state operation, the magnetic line of force, in divergent shape, is then in inside in end
It is in closed loop by axis of centre, it is whole symmetrical along central axis.
By that approximate can regard the property of axially symmetric structure, Main Analysis dry-type air-core reactor as using power reactor
Whether there is or not the distribution character of axial magnetic field when turn-to-turn short circuit, the turn-to-turn for detecting dry-type air-core reactor by axial magnetic field differential technique is short
Road failure does not influence reactor normal operation, and being capable of real-time monitoring reactor turn-to-turn insulation shape with reactor without electrical connection
State has real-time.
It is limited as further, when reactor steady-state operation, distribution of the magnetic flux density inside air reactor is also
Symmetrically, maximum value region is the middle section of innermost layer.
The results show that the Distribution of Magnetic Field on vertex is above and below central axis in the case of dry-type air-core reactor steady-state operation
Symmetrically, magnetic field difference can be considered as zero.
It is limited as further, when shorted-turn fault occurs for reactor, the Distribution of Magnetic Field on the upper and lower vertex of reactor is not
It is symmetrical again.
The results show that in the case of dry type hollow reactor interturn short circuit fault, the symmetrical magnetic on vertex above and below central axis
Field distribution is broken, it may appear that biggish magnetic field difference.
This can use the variation of this difference to carry out the judgement of shorted-turn fault with this phenomenon.
As a kind of achievable technical solution, above and below reactor center axis at vertex position and at axial centre position
Detect alternating magnetic field.
As a kind of achievable technical solution, detecting alternating magnetic field can use search coil realization.
It is limited as further, the first threshold is that preceding 24 hours differential voltages are maximum effectively after reactor dispatches from the factory
K times of value, k are safety margin, are greater than 1.It can be arranged as the case may be.
It is limited as further, when the second threshold is reactor steady-state operation, the magnetic of reactor middle position
N times of field intensity, n are greater than 100.It can be arranged as the case may be.
A kind of computer readable storage medium, wherein being stored with a plurality of instruction, described instruction is suitable for by terminal device
Reason device loads and executes the shorted-turn fault detection method of the axial magnetic field difference.
A kind of terminal device, including processor and computer readable storage medium, processor is for realizing each instruction；It calculates
For storing a plurality of instruction, it is poor that described instruction is suitable for being loaded by processor and being executed the axial magnetic field machine readable storage medium storing program for executing
The shorted-turn fault detection method of value.
A kind of shorted-turn fault detection system of axial magnetic field difference, including processor and data acquisition module, it is described
Processor loads and executes the shorted-turn fault detection method of the axial magnetic field difference, and the data acquisition module includes
At least three, it is respectively arranged at reactor axial vertex and middle section up and down, the data acquisition module is by the data of acquisition
It is transferred to the processor.
Compared with prior art, the disclosure has the beneficial effect that
The disclosure approximate can regard the property of axially symmetric structure, Main Analysis dry-type hollow reactance as using power reactor
Whether there is or not the distribution characters of axial magnetic field when turn-to-turn short circuit for device, and the turn-to-turn of dry-type air-core reactor is detected by axial magnetic field differential technique
Short trouble does not influence reactor normal operation, and being capable of real-time monitoring reactor turn-to-turn insulation with reactor without electrical connection
State has real-time；
When the disclosure can effectively solve dry-type air-core reactor small turn number occurs than shorted-turn fault, be difficult from inductance and
The problem of angle of electric current detects turn-to-turn short circuit；
The detection process of the disclosure will not damage the performance of power reactor itself, and detection limit is easy to obtain,
Magnetic field induction element only need to be can be realized, input cost is small.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the field circuit method simulating schematic diagram in the present embodiment；
Fig. 2 is electric reactor magnetic field distribution map in the case of steady-state operation in the present embodiment；
Fig. 3 is electric reactor magnetic field distribution map in the case of turn-to-turn short circuit in the present embodiment；
Fig. 4 is axial magnetic field difference value method flow chart in the present embodiment；
Specific embodiment:
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As described in the background art, dry-type air-core reactor occur small turn number than shorted-turn fault when, be difficult from
The angle of inductance and electric current detects turn-to-turn short circuit.
Angle research dry type hollow reactor interturn short circuit fault detection method of the present embodiment from magnetic field.Consider further that electricity
Power reactor can approximation regard axially symmetric structure as, therefore whether there is or not axial magnetic fields when turn-to-turn short circuit for Main Analysis dry-type air-core reactor
Distribution character, pass through axial magnetic field differential technique detect dry-type air-core reactor shorted-turn fault.Specifically, measurement point
It is selected in the vertex up and down of the axial centre axis of dry-type air-core reactor, measurement point places magnetic field measuring instrument.Real-time measurement reactance
Magnetic field strength difference when device is run between upper vertex and lower vertex is simultaneously compared with threshold value, judges reactor turn-to-turn insulation knot
Whether structure is intact.
The finite element analysis of electric reactor magnetic field is carried out first, and FInite Element is to be applied to according to mathematical approach to physical system
Realistic simulation, by continuous physical quantity discretization, then accumulate the physical quantity of approaching to reality.FInite Element is that computational EM waves are asked
The basic skills of topic, that is, on the basis of combining discrete principle and the Piecewise polynomial difference value principle in numerical value calculating, with max
Wei equation group is starting point, the magnetic field that air reactor generates is become discrete digital quantity from continuous physical quantity, with limited
Based on several freedom degrees of a unit, approximate simulation goes out the situation on unlimited and continuous region, constantly approaches actual value.
Its coupling magnetic field with electric circuit principle is as shown in Figure 1.
Magnetic field strength calculates step are as follows:
1. setting electromagnetism basic parameter；
2. founding mathematical models；
3. analyzing mathematical model, corresponding circuit model is obtained；
4. establishing finite element model, coupling magnetic field with electric circuit is completed；
5. pair model solution calculates；
6. handling calculated result.
Above-mentioned detailed process is known technology, and details are not described herein.
Finite element method analyzes reactor steady-state operation and Distribution of Magnetic Field when shorted-turn fault, conclusion occurs
It is as follows:
As shown in Fig. 2, the magnetic line of force of reactor steady state operation dry-type air-core reactor in end in divergent shape,
It is then using centre in inside is axis in closed loop, it is whole symmetrical along central axis.Magnetic flux density is in hollow electricity
Distribution inside anti-device is also that symmetrically, maximum value region is the middle section of innermost layer.
In the case of steady-state operation, the Distribution of Magnetic Field on vertex is symmetrical, magnetic field above and below dry-type air-core reactor central axis
Difference is approximately 0.
As shown in figure 3, reactor solenoid structure will be no longer symmetrical, at this time on reactor when shorted-turn fault occurs
The Distribution of Magnetic Field on lower vertex is no longer symmetrical, i.e. the distribution in magnetic field is distorted, at this moment the magnetic field difference at upper and lower vertex position
It will no longer be 0.
The reason of magnetic field is distorted is under interturn short-circuit state that short-circuited conducting sleeve reverse current generation magnetic field can weaken original
Magnetic field.At short-circuited conducting sleeve, this field weakening effect is more obvious；At short-circuited conducting sleeve, it is weaker to weaken effect.Circle
Between short circuit make the distribution of electric reactor magnetic field that apparent variation have occurred, the magnetic field strength at failure increases hundreds of times.Therefore, such as
There is shorted-turn fault in fruit reactor, then short-circuited conducting sleeve wherein no matter occurs, surrounding has very strong toroidal magnetic field, and
And the magnetic field of other positions can also be impacted.
Shorted-turn fault makes the Distribution of Magnetic Field of dry-type air-core reactor the central axis asymmetric phenomenon in vertex up and down occur.
Therefore, judging that the problem of whether dry-type air-core reactor occurs shorted-turn fault translates into judges electric reactor magnetic field in space
It is upper distribution whether symmetrical problem.Select search coil method detect alternating magnetic field, can above and below reactor center axis vertex position
Install whether two magnetic field detecting coils detection magnetic fields symmetrically judge whether reactor occurs shorted-turn fault.
In view of shorted-turn fault may occur exactly at reactor axial centre position, reactor is axial up and down at this time
The Distribution of Magnetic Field on vertex is symmetrical, it is therefore desirable to additionally place a search coil in middle position and detect its magnetic field.Due to failure
The magnetic field strength at place will increase hundreds of times, therefore the shorted-turn fault detection of the position can be completed by the search coil.
Specific implementation flow is as shown in figure 4, at least detect the magnetic field on reactor axial vertex and middle part up and down；
Vertex axial direction magnetic field difference value up and down is calculated, if the difference is greater than first threshold, it is short to determine that turn-to-turn occurs for reactor
Road failure if it is determines that turn-to-turn short circuit occurs for reactor otherwise, it determines whether the magnetic field of middle section is greater than second threshold
Failure, otherwise, it is determined that reactor is without shorted-turn fault.
In the above process, judge whether reactor occurs shorted-turn fault needs and set using reactor axial magnetic field difference
Set a reasonable threshold value.Fault detection directly sets a threshold value according to axial magnetic field difference, when reactor axial magnetic field is poor
Being worth size is more than the threshold value alarm.
The threshold value is set by experimental method, and this method can consider being positive for first 24 hours for operation of casting net after reactor factory
Normal operating status, user can count therein according to self registering first 24 hours reactor axial magnetic field differences of software
Then maximum value is set.It specifically can be according to formula:
Δ D=k Δ dmax
It is wherein the threshold value of Δ D setting, Δ dmaxFirst 24 hours differential voltage maximum virtual values after dispatching from the factory for reactor,
To guarantee that safety need to there are certain nargin, secure threshold k to take 1.05 in the present embodiment.
Correspondingly, as another embodiment, a kind of computer readable storage medium is provided, wherein being stored with a plurality of finger
It enables, instruction is suitable for being loaded by the processor of terminal device and executes the turn-to-turn short circuit of axial magnetic field difference provided by the above embodiment
Fault detection method.
As another embodiment, a kind of terminal device, including processor and computer readable storage medium are provided, handled
Device is for realizing each instruction；Computer readable storage medium is suitable for being loaded by processor for storing a plurality of instruction, described instruction
And execute the shorted-turn fault detection method of axial magnetic field difference provided by the above embodiment.
As another embodiment, a kind of shorted-turn fault detection system of axial magnetic field difference, including processing are provided
Device and data acquisition module, the processor load and execute the turn-to-turn short circuit event of axial magnetic field difference provided by the above embodiment
Hinder detection method, the data acquisition module includes at least three, is respectively arranged at reactor axial vertex and middle part up and down
Point, the data of acquisition are transferred to the processor by the data acquisition module.
Data acquisition module can select magnetic field induction element, including magnetic field detecting coil.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, model not is protected to the disclosure
The limitation enclosed, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (10)
1. a kind of shorted-turn fault detection method of axial magnetic field difference, it is characterized in that: the following steps are included:
At least magnetic field on detection reactor axial vertex and middle part up and down；
Vertex axial direction magnetic field difference value up and down is calculated, if the difference is greater than first threshold, determines that turn-to-turn short circuit event occurs for reactor
Barrier if it is determines that turn-to-turn short circuit event occurs for reactor otherwise, it determines whether the magnetic field of middle section is greater than second threshold
Barrier, otherwise, it is determined that reactor is without shorted-turn fault.
2. a kind of shorted-turn fault detection method of axial magnetic field difference as described in claim 1, it is characterized in that: further including
Based on finite element analysis, determines reactor steady-state operation and Distribution of Magnetic Field situation when shorted-turn fault occurs.
3. a kind of shorted-turn fault detection method of axial magnetic field difference as claimed in claim 2, it is characterized in that: described have
Finite element analysis process be in conjunction with numerical value calculate in discrete principle and Piecewise polynomial difference value principle on the basis of, with Maxwell
Equation group is starting point, the magnetic field that air reactor generates is become discrete digital quantity from continuous physical quantity, with Finite Number
Based on several freedom degrees for measuring unit, approximate simulation goes out the situation on unlimited and continuous region, constantly approaches actual value.
4. a kind of shorted-turn fault detection method of axial magnetic field difference as claimed in claim 2, it is characterized in that: reactor
When steady-state operation, the magnetic line of force be then using centre in inside is axis in closed loop, whole edge in divergent shape in end
It is symmetrical at central axis；
Or/and when reactor steady-state operation, distribution of the magnetic flux density inside air reactor is also symmetrical, maximum value area
Domain is the middle section of innermost layer.
5. a kind of shorted-turn fault detection method of axial magnetic field difference as claimed in claim 2, it is characterized in that: reactor
When shorted-turn fault occurs, the Distribution of Magnetic Field on vertex is no longer symmetrical above and below reactor.
The results show that in the case of dry type hollow reactor interturn short circuit fault, the symmetric magnetic field point on vertex above and below central axis
Cloth is broken, it may appear that biggish magnetic field difference.
6. a kind of shorted-turn fault detection method of axial magnetic field difference as described in claim 1, it is characterized in that: in reactance
Alternating magnetic field is detected above and below device central axis at vertex position and at axial centre position.
7. a kind of shorted-turn fault detection method of axial magnetic field difference as described in claim 1, it is characterized in that: described the
One threshold value is k times of first 24 hours differential voltage maximum virtual values after reactor dispatches from the factory, and k is safety margin, is greater than 1；
Or/and the second threshold be reactor steady-state operation when, n times of the magnetic field strength of reactor middle position, n is big
In 100.
8. a kind of computer readable storage medium, it is characterized in that: being wherein stored with a plurality of instruction, described instruction is suitable for being set by terminal
Standby processor load and perform claim requires the shorted-turn fault detection side of axial magnetic field difference described in any one of 1-7
Method.
9. a kind of terminal device, including processor and computer readable storage medium, it is characterized in that: processor is for realizing each finger
It enables；Computer readable storage medium is suitable for for storing a plurality of instruction, described instruction by processor load and perform claim requirement
The shorted-turn fault detection method of axial magnetic field difference described in any one of 1-7.
10. a kind of shorted-turn fault detection system of axial magnetic field difference, it is characterized in that: including processor and data acquisition module
Block, the processor load and perform claim require the shorted-turn fault inspection of axial magnetic field difference described in any one of 1-7
Survey method, the data acquisition module include at least three, are respectively arranged at reactor axial vertex and middle section up and down, institute
It states data acquisition module and the data of acquisition is transferred to the processor.
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| CN112345983A (en) * | 2020-11-10 | 2021-02-09 | 国网江苏省电力有限公司盐城供电分公司 | Reactor winding fault detection system based on optical fiber transmission and detection method thereof |
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Application publication date: 20190618 |