CN206223961U - Simulate the experimental rig of short-circuit fault of power system electric current - Google Patents
Simulate the experimental rig of short-circuit fault of power system electric current Download PDFInfo
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- CN206223961U CN206223961U CN201621228015.4U CN201621228015U CN206223961U CN 206223961 U CN206223961 U CN 206223961U CN 201621228015 U CN201621228015 U CN 201621228015U CN 206223961 U CN206223961 U CN 206223961U
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- 238000012360 testing method Methods 0.000 claims abstract description 15
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
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Abstract
The utility model discloses a kind of experimental rig for simulating short-circuit fault of power system electric current.Wherein, the device includes：Input module, the information for receiving the fault current for needing simulation；Control module, is connected with input module, capture card, Program Control Direct Current Source；Capture card, is connected with control module and power amplifier；Power amplifier, with capture card and etc. ampere-turn be connected, for wait ampere-turn output ac-decay current signal；Program Control Direct Current Source, is connected with grade ampere-turn, for grade ampere-turn output dc-decay current signal；Deng ampere-turn, it is connected with power amplifier, Program Control Direct Current Source, current transformer, for receiving ac-decay current signal and dc-decay current signal, and ac-decay current signal and dc-decay current signal is applied in current transformer.The utility model solves the big technical problem of the short-circuit test caloric value for carrying out current transformer using direct method in the prior art.
Description
Technical field
The utility model is related to power domain, in particular to a kind of examination for simulating short-circuit fault of power system electric current
Experiment device.
Background technology
In the running of power system, often break down, wherein most of is short trouble.So-called short circuit event
Barrier, refers to that power system occurs improper connection between phase and phase or between phase and ground (or neutral conductor) in operation.Due to
The now impedance of trouble point becomes very little, and electric current will be raised in a flash, and the voltage before short dot declines, and influences whether electricity
The stable operation of Force system, serious short circuit even can cause systemic breakdown.
It is insulation in addition to neutral point, between phase and phase or phase and ground in normal operation.In three-phase system, short circuit
The fundamental type of failure is single-line to ground fault, line to line fault, line to line fault ground connection and three-phase shortcircuit etc..Single-line to ground fault is
Refer to phase line and the earth into equipotential state in three-phase AC electrical supply system, both the current potential phase of the line current potential of the phase and the earth
Deng being all " zero ".Popular saying is exactly single-phase earthing in A phases or B phases or C phases.Line to line fault refers to three-phase alternating-current powered system
Unite any two phase conductor, direct metal is connected or linked together through too small impedance.Line to line fault ground connection refers to three-phase alternating current
Two phase lines and the earth into equipotential state in electric power system.It is popular say be exactly any two-phase in A, B, C three-phase simultaneously with
The non-resistance of the earth is directly connected to.Three-phase shortcircuit refer in three-phase AC electrical supply system A, B, C three-phase certain point zero resistance,
Zero reactance is directly connected to.Wherein, three-phase shortcircuit belongs to symmetrical short-circuit, and the short circuit of other forms belongs to unsymmetrical short-circuit；In neutrality
In the system that point is directly grounded, generation single phase grounding fault is most commonly seen, and the possibility that three phase short circuit fault occurs is minimum,
But it is harm system most serious.
Current transformer is a kind of special transformer according to electromagnetic induction principle manufacture, is a kind of important in power system
Electric signal progress of disease equipment, be divided into metering type and the major class of protection type two.The Main Function of current transformer is by primary system
High current be transformed into secondary low current, then respectively to measuring instrument or protective relay current coil provide electric current believe
Number, correctly to measure the normal operational parameters of electrical equipment and system and reflect its failure situation.Current transformer can be realized
The electrical isolation of the secondary devices such as measuring instrumentss, protective relay and primary system, both can effectively prevent the overvoltage from introducing
To double measurement and protection equipment, the fault impact of secondary meter and equipment to the normal operation of primary circuit can be avoided again, from
And improve the operation security and reliability in whole first and second loop.Meanwhile, current transformer causes that secondary side apparatus realize standard
Change, minimize, be easy to shield interior I＆M.Although Rogowski coil current transformer, optical current mutual inductor in recent years
Greater advance is achieved etc. the development of new-style electronic transformer, with good characteristics such as diamagnetic saturations, but still in research and development rank
Section and the application of part, electromagnetic current transducer is still largely used in current system.Electromagnetic current transducer is used as standard
Metering and protection test equipment, be widely used in power system, but the iron of electromagnetic current transducer
Core can form substantial amounts of remanent magnetism after the disconnection of failed shorted electric current, and remanent magnetism would not disappear automatically once producing, and normal
Long-term existence under service condition.For metering type current transformer, the presence of remanent magnetism declines iron core magnetic conductivity, causes transformer
Angular difference polarization, than difference partially bear, be cause accuracy of instrument transformers grade decline main reason.For protection type Current Mutual Inductance
Device, if the magnetic flux that aperiodic component is produced is consistent with remanence direction, the presence of remanent magnetism will make current transformer on excitation curve
Start work point change, shorten iron core enter saturation time, aggravate core sataration degree, cause secondary current ripple
Shape is distorted, and quick-break overcurrent protection will occur tripping because the current effective value for obtaining is smaller, and differential protection is because of imbalance
The generation of electric current will occur malfunction.In order to accurately analyze influence of the short trouble to current transformer for metering Transfer characteristic, need
Actual short failure is simulated, the exporting change of current transformer is examined.
The short-circuit test of current transformer is carried out using direct method in the prior art, wherein direct method experiment needs an appearance
Amount is sufficiently large, and possesses the current source of phase selection function, additionally, it needs to meet primary circuit time constant requirement, heating
Amount is big, and the extent of deterioration to equipment is larger.
For above-mentioned problem, effective solution is not yet proposed at present.
Utility model content
The utility model embodiment provides a kind of experimental rig for simulating short-circuit fault of power system electric current, at least to solve
The big technical problem of the short-circuit test caloric value that certainly carries out current transformer using direct method in the prior art.
According to the one side of the utility model embodiment, there is provided a kind of examination of simulation short-circuit fault of power system electric current
Experiment device, including：Input module, is connected with control module, the information for receiving the fault current for needing simulation；The control
Molding block, is connected with the input module, capture card, Program Control Direct Current Source；The capture card, with the control module and
Power amplifier is connected；Power amplifier, with the capture card and etc. ampere-turn be connected, for it is described wait ampere-turn output hand over
Stream decaying current signal；The Program Control Direct Current Source, waits ampere-turn to be connected with described, for waiting ampere-turn output direct current to described
Decaying current signal；It is described to wait ampere-turn, it is connected with the power amplifier, the Program Control Direct Current Source, current transformer
Connect, for receiving the ac-decay current signal and the dc-decay current signal, and the ac-decay electric current is believed
Number and the dc-decay current signal be applied in the current transformer.
Further, the information of the fault current for needing to simulate includes test waveform, and the input module includes：Figure
Shape tablet, is connected with the control module, for receiving the test waveform.
Further, the information of the fault current for needing to simulate includes Wave data, and the input module includes：Number
According to gatherer, it is connected with the control module and monitoring device, for importing the monitoring device to the control module
Derived Wave data.
Further, the information of the fault current for needing to simulate includes frequency, amplitude, phase, attenuation coefficient, direct current
Biasing, the input module includes：Keyboard, is connected with control module, for receiving at least one of：It is described to need simulation
Fault current frequency, amplitude, phase, attenuation coefficient, direct current biasing.
Further, the equal decile in central area of iron core of the multiturn wire of the ampere-turn such as described in the current transformer
Cloth.
Further, the ac-decay current signal and the dc-decay current signal etc. ampere-turn interlock coiling,
Centre is isolated with insulation board.
Further, it is described to wait ampere-turn to use 3mm*12mm copper bar coilings.
Further, it is described to wait ampere-turn insulating materials to couple together the copper bar of different circles.
Further, the number of turn of the ampere-turn such as described is 80 circles.
Further, it is described to wait left and right each 40 circle of ampere-turn.
In the utility model embodiment, by input module by the information input of the fault current of required simulation to control
Module, control module controls capture card, power amplifier and Program Control Direct Current Source to export respectively according to the information of fault current
Ac-decay current signal and dc-decay current signal to etc. ampere-turn, AC signal and direct current signal superposition are applied in ampere-turn is waited
It is added in current transformer, realizes the short circuit current experiment of current transformer, simulation short trouble produces alternating current by exchanging
Current source is produced, and the direct current signal that short trouble is produced is produced by programmable DC current source, and reached is carried out using indirect method
The small technique effect of the short-circuit test caloric value of current transformer, and then solve and carry out electric current using direct method in the prior art
The big technical problem of the short-circuit test caloric value of transformer.
Brief description of the drawings
Accompanying drawing described herein is used for providing being further understood to of the present utility model, constitutes of the present utility model one
Point, schematic description and description of the present utility model is used to explain the utility model, does not constitute to of the present utility model
Improper restriction.In the accompanying drawings：
Fig. 1 is a kind of showing for the experimental rig of the simulation short-circuit fault of power system electric current according to the utility model embodiment
It is intended to；
Fig. 2 is the experimental rig of another simulation short-circuit fault of power system electric current according to the utility model embodiment
Schematic diagram；
Fig. 3 is the front view for waiting ampere-turn according to the utility model embodiment；
Fig. 4 is the top view for waiting ampere-turn according to the utility model embodiment.
Specific embodiment
In order that those skilled in the art more fully understand the utility model scheme, below in conjunction with the utility model reality
The accompanying drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the embodiment of the utility model part, rather than whole embodiments.Based on the reality in the utility model
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made all should
When the scope for belonging to the utility model protection.
According to the utility model embodiment, there is provided a kind of reality of the experimental rig of simulation short-circuit fault of power system electric current
Apply example.
Fig. 1 is a kind of showing for the experimental rig of the simulation short-circuit fault of power system electric current according to the utility model embodiment
It is intended to, as shown in figure 1, the device includes：Input module 10, control module 20, capture card 30, power amplifier 40, programmed direct
Stream current source 50, etc. ampere-turn 60.
Input module 10, is connected with control module 20, the information for receiving the fault current for needing simulation.
Control module 20, is connected with input module 10, capture card 30, Program Control Direct Current Source 50.
Capture card 30, is connected with control module 20 and power amplifier 40.
Power amplifier 40, with capture card 30 and etc. ampere-turn 60 be connected, for wait ampere-turn 60 output ac-decay electricity
Stream signal.
Program Control Direct Current Source 50, is connected with grade ampere-turn 60, for grade output dc-decay current signal of ampere-turn 60.
Deng ampere-turn 60, it is connected with power amplifier 40, Program Control Direct Current Source 50, current transformer 70, for connecing
Ac-decay current signal and dc-decay current signal are received, and ac-decay current signal and dc-decay current signal are applied
It is added in current transformer 70.
In the utility model embodiment, by input module by the information input of the fault current of required simulation to control
Module, control module controls capture card, power amplifier and Program Control Direct Current Source to export respectively according to the information of fault current
Ac-decay current signal and dc-decay current signal to etc. ampere-turn, AC signal and direct current signal superposition are applied in ampere-turn is waited
It is added in current transformer, realizes the short circuit current experiment of current transformer, simulation short trouble produces alternating current by exchanging
Current source is produced, and the direct current signal that short trouble is produced is produced by programmable DC current source, it is to avoid direct use alternating current-direct current
The big problem of power amplifier device caloric value, has reached the short-circuit test caloric value for carrying out current transformer using indirect method small
Technique effect.
The device that the utility model embodiment is provided, for carrying out short-circuit fault test to current transformer, is respectively adopted
Ac current source and programmable DC current source based on Digital Signal Processing, using etc. ampere-turn, by AC signal and straight
Stream signal is applied to current transformer simultaneously, by peak value, frequency, phase, die-away time and the direct current biasing etc. that change electric current
Parameter, the various current signals of short trouble in simulation power system.Allow multiturn wire equal distribution on winding circumference,
The magnetic field piecewise uniform on the whole that it is produced, realizes a High-current output of 4kA.Exchange based on Digital Signal Processing
Current source is mainly made up of capture card, power amplifier, input module and control module.
Alternatively, it is necessary to the information of the fault current of simulation includes test waveform, input module includes：Graphic tablet.
Graphic tablet, is connected with control module, for receiving test waveform.
Alternatively, it is necessary to the information of the fault current of simulation includes Wave data, input module includes：Data import dress
Put.Data importing device, is connected with control module and monitoring device, for importing ripple derived from monitoring device to control module
Graphic data.
Alternatively, it is necessary to the information of the fault current of simulation includes frequency, amplitude, phase, attenuation coefficient, direct current biasing,
Input module includes：Keyboard.Keyboard, is connected with control module, for receiving at least one of：Need the failure electricity of simulation
The frequency of stream, amplitude, phase, attenuation coefficient, direct current biasing.
As shown in Fig. 2 input module 10 includes：Graphic tablet 102, data importing device 104, keyboard 106.It is corresponding
Input mode has figure to be input into, data are imported and three kinds of modes of input through keyboard, and figure input is by electricity on graphic tablet
Hold pen and draw waveform needed for experiment, the information input of waveform to capture card is drawn by sensor identification, capture card calculates place again
Reason draws the parameters such as frequency, amplitude, phase, cycle and the attenuation coefficient of drafting waveform, is then communicated to control module；Data
Lead-in mode is the data that fault waveform is first obtained with monitoring device, generates database, then imported into the data of database
Control module；Input through keyboard is frequency, amplitude, phase, attenuation coefficient and the direct current biasing etc. for directly inputting required fault current
Parameter is to control module.The information that control module is input into according to input module controls the DA on capture card to export the electricity of respective waveforms
Pressure signal, then by the voltage signal input power amplification module output current signal, then the current signal is input to " day "
The ampere-turns such as font are applied on current transformer.
The utility model can according to demand simulate the short circuit current of short trouble generation, and short circuit is carried out to current transformer
Test to Failure.Maximum primary current can reach 4kA, the amplitude of electric current, frequency, phase, attenuation factor and direct current biasing
Set.
Using etc. ampere-turn, unrolled structure using " Si " font, each 40 circle in left and right, totally 80 circle, allows wire of multiturn in electricity
Current transformer core center region equal distribution, the magnetic field piecewise uniform on the whole that it is produced, realizes a high current up to 4kA
Output.Fig. 3 is the front view for waiting ampere-turn according to the utility model embodiment.Fig. 4 is according to the utility model embodiment
Deng the top view of ampere-turn.
Using the ac current source based on Digital Signal Processing, the ac current source is mainly put by capture card, power
Big device, input module and control module composition, frequency bandwidth can export 100A electric currents up to 100kHz, maximum.
Be the influence for avoiding current source to synthesize as far as possible, by ac current source and DC current source etc. ampere-turn interlock coiling,
Centre is isolated with insulation board.
The utility model is utilized compared with low capacity transient current source and DC current source superposition by the way of indirect method
Current source solves the problems, such as high-power test.
In the present embodiment, what graphic tablet was selected is friendly base (UGEE) UG2150 Digitizing plates, what control module was selected
It is to grind magnificent industrial computer IPC-610L, that capture card is selected is the PCI-6259 of NI, and that power amplifier is selected is AE Techron
The amplifier power supply 7548 of company, what programme-controlled dc power was selected is the PWS2326 of Tektronix companies, waits ampere-turn to use 3mm*
12mm copper bar coilings, totally 80 circle.The copper bar of different circles is linked up and kept each other Deng ampere-turn loop insulating materials
Insulation.
The above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as protection domain of the present utility model.
Claims (10)
1. it is a kind of simulate short-circuit fault of power system electric current experimental rig, it is characterised in that including：
Input module, is connected with control module, the information for receiving the fault current for needing simulation；
The control module, is connected with the input module, capture card, Program Control Direct Current Source；
The capture card, is connected with the control module and power amplifier；
Power amplifier, with the capture card and etc. ampere-turn be connected, for waiting ampere-turn output ac-decay electric current to believe to described
Number；
The Program Control Direct Current Source, waits ampere-turn to be connected with described, for waiting ampere-turn output dc-decay electric current to believe to described
Number；
It is described to wait ampere-turn, it is connected with the power amplifier, the Program Control Direct Current Source, current transformer, for connecing
Receive the ac-decay current signal and the dc-decay current signal, and by the ac-decay current signal and described straight
Stream decaying current signal is applied in the current transformer.
2. device according to claim 1, it is characterised in that the information of the fault current of the needs simulation includes experiment
Waveform, the input module includes：
Graphic tablet, is connected with the control module, for receiving the test waveform.
3. device according to claim 1, it is characterised in that the information of the fault current of the needs simulation includes waveform
Data, the input module includes：
Data importing device, is connected with the control module and monitoring device, for importing the prison to the control module
Survey Wave data derived from device.
4. device according to claim 1, it is characterised in that the information of the fault current of the needs simulation includes frequency
Rate, amplitude, phase, attenuation coefficient, direct current biasing, the input module include：
Keyboard, is connected with control module, for receiving at least one of：The frequency of the fault current for needing to simulate,
Amplitude, phase, attenuation coefficient, direct current biasing.
5. device according to claim 1, it is characterised in that the multiturn wire for waiting ampere-turn is in the current transformer
Iron core central area equal distribution.
6. device according to claim 1, it is characterised in that the ac-decay current signal and dc-decay electricity
The ampere-turn that waits of stream signal interlocks coiling, and centre is isolated with insulation board.
7. device according to claim 1, it is characterised in that described to wait ampere-turn to use 3mm*12mm copper bar coilings.
8. device according to claim 1, it is characterised in that described to wait ampere-turn insulating materials to connect the copper bar of different circles
Pick up and.
9. device according to claim 1, it is characterised in that the number of turn for waiting ampere-turn is 80 circles.
10. device according to claim 9, it is characterised in that described to wait left and right each 40 circle of ampere-turn.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621228015.4U CN206223961U (en) | 2016-11-15 | 2016-11-15 | Simulate the experimental rig of short-circuit fault of power system electric current |
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| CN201621228015.4U CN206223961U (en) | 2016-11-15 | 2016-11-15 | Simulate the experimental rig of short-circuit fault of power system electric current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108446441A (en) * | 2018-02-11 | 2018-08-24 | 中国电力科学研究院有限公司 | A kind of analogue system for analog current mutual inductor short trouble |
| CN115047224A (en) * | 2022-05-18 | 2022-09-13 | 中检质技检验检测科学研究院有限公司 | Experimental short circuit and fault identification and protection system and application method thereof |
-
2016
- 2016-11-15 CN CN201621228015.4U patent/CN206223961U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108446441A (en) * | 2018-02-11 | 2018-08-24 | 中国电力科学研究院有限公司 | A kind of analogue system for analog current mutual inductor short trouble |
| CN115047224A (en) * | 2022-05-18 | 2022-09-13 | 中检质技检验检测科学研究院有限公司 | Experimental short circuit and fault identification and protection system and application method thereof |
| CN115047224B (en) * | 2022-05-18 | 2024-01-09 | 中检质技检验检测科学研究院有限公司 | Using method of identification and protection system for experimental short circuit and fault |
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