CN208805810U - The anti-resonant electromagnetic formula voltage transformer of high-damping - Google Patents
The anti-resonant electromagnetic formula voltage transformer of high-damping Download PDFInfo
- Publication number
- CN208805810U CN208805810U CN201821633044.8U CN201821633044U CN208805810U CN 208805810 U CN208805810 U CN 208805810U CN 201821633044 U CN201821633044 U CN 201821633044U CN 208805810 U CN208805810 U CN 208805810U
- Authority
- CN
- China
- Prior art keywords
- iron core
- primary side
- damping
- voltage transformer
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Abstract
A kind of anti-resonant electromagnetic formula voltage transformer of high-damping belongs to energy electrical network field, including iron core, armature winding, secondary windings composition；Voltage transformer voltage rating, when primary side is 10000/ √ 3V, 100/ √ 3V of primary side, 12000 circle of primary side umber of turn, 120 circle of low-pressure side；Bilateral arrangement, iron core is rectangular hollow iron core, armature winding, secondary windings around the concentric side of iron core around；Resistive component is evenly distributed in armature winding by realization, effective to inhibit ferromagnetic resonance problem.It can be widely used in energy electrical network field.
Description
Technical field
The invention belongs to a kind of high-damping of energy technology field, more particularly, to electric system power grid control protection is anti-
Resonant electromagnetic formula voltage transformer and mutual sensing method.
Background technique
Ferromagnetic resonance is a kind of self-oscillatory form of electric system, is due to the ferromagnetic electricity such as transformer, voltage transformer
Duration caused by the saturation of sense, amplitude resonance overvoltage phenomenon.It is mainly characterized in that:
(1) in resonant tank iron inductance be it is nonlinear, inductance with electric current increase, core sataration and tend to be steady.
(2) ferromagnetic resonance needs certain shooting condition, as supply voltage temporarily increases, system is by stronger electric current
Impact etc., makes voltage, current amplitude be transferred to resonant state from normal operating conditions.
(3) there are self-sustaining phenomenons for ferromagnetic resonance.After excitation condition disappears, ferro-resonance over-voltage still can continue to grow
Phase exists.
By These characteristics, ferromagnetic resonance has self-sustaining characteristic, continues working PT in saturation excited state, causes PT mistake
Heat is until burn；So that systems stay is operated in overvoltage condition, causes electrical apparatus insulation to destroy and even puncture.Ferromagnetic resonance is to influence
One of major issue of safe operation of power system.
Experts and scholars both domestic and external have carried out a large amount of research to ferromagnetic resonance for decades, including theory analysis, various
It tests and gradually carries out the phenomenon that numerical simulation calculating etc. explains PT ferromagnetic resonance from each different angle using computer
And its changing rule, and a series of measures for inhibiting ferromagnetic resonance are proposed, corresponding device is had developed, in system operation
Achieve certain effect.But scene operation the result shows that, these measures fail to solve whole issue, have certain office
Limit.Harmonic elimination effect most preferably preset arc suppression coil, but be generally all installed in system of the system power greater than 10A, regulation
Regulation system capacitive current is less than 10A and is typically chosen isolated neutral mode, still lacks a kind of effective disappear so far
Humorous measure.
It was verified that common harmonic elimination resistance of SiC can eliminate most of ferromagnetic resonance, but some situations is ferromagnetic
Resonance is not eliminated, at the same a resonance eliminator there is also increase PT tail end voltage, influence voltage measurement accuracy the problems such as, especially
The problem of increasing PT tail end voltage, or even will cause the tail end insulation breakdown of semi-insulating PT, form serious security risk！
Secondary resonance elimination device is to sentence play, real-time monitoring PT open delta voltage, and carry out Fourier with the angle voltage that is open
Calculate etc., when PT opening voltage be more than 30V when, starting judge, if open delta voltage occur 17Hz, 25Hz, 50Hz,
The component of voltage of the frequencies such as 150Hz, then start harmonic elimination.Firstly, this process sampling calculating time is longer, delay time one is acted
As all in 100ms or more；PT producer kind model in practical application is various, and excitation property, impedance operator difference are very big,
The amplitude of resonance, frequency are also with regard to significant difference, and many Ferroresonance Process are not stable, the calculating warps based on Fourier
Often there is large error, the problems such as misjudgment, harmonic elimination tripping occurs；Second, system direct-to-ground capacitance fills when single-phase earthing disappears
Discharge current often causes PT fuse blows to the impact of PT, and during this, the amplitude of voltage signal is often especially small,
It is difficult to detect；Third, conventional algorithm cannot accurately identify industrial frequency resonance；4th, secondary resonance elimination device is unable to continuous several times movement,
Otherwise, PT can be because the frequent short circuit of angular aperture occurs overheat and even burns.Therefore secondary resonance elimination device equally cannot be solved thoroughly
Ferromagnetic resonance problem.
Summary of the invention
In place of the deficiencies of to overcome PT tail end voltage, influence voltage measurement accuracy in the prior art, a kind of high-damping is invented
Anti- resonant electromagnetic formula voltage transformer and mutual sensing method.
A kind of anti-resonant electromagnetic formula voltage transformer of high-damping, including iron core, armature winding, secondary windings composition；Mutual inductance
The connection relationship of device is: voltage transformer voltage rating, when primary side is 10000/ √ 3V, 100/ √ 3V of primary side, primary side
12000 circle of umber of turn, 120 circle of low-pressure side；Primary side chooses 0.2mm enamel covered wire, and primary side chooses 1mm enamel covered wire；It is double
Side arrangement, coil axial dimension 100mm, width is to size 9mm；Iron core column is away from height 100mm, window width 160mm；Iron core is square
Shape hollow core, armature winding, secondary windings around the concentric side of iron core around.
A kind of anti-resonant electromagnetic formula mutual induction of voltage method of high-damping: design procedure is as follows:
(a) according to PT load capacity, iron core diameter is set；
(b) according to the linear flux density working range of iron core, iron core work flux density is set；
(c) armature winding the number of turns can be calculated according to PT voltage rating and core area and work flux density；
(d) secondary winding turns are determined according to nominal transformation ratio relationship；
(e) capacity is responsible for according to PT, wire gauge is determined, and arranged is carried out by the number of turns, so that it is determined that the knot of coil
Structure size, and then determine core structure size.
(f) according to the size and weight data of iron core and coil, calculated performance parameter.
Technology path of the invention is that voltage than deviation and phase should meet design requirement than deviation, i.e. design coil turn
The dosage ratio of number, the conductor resistance rate of coil, iron core material and structure size, iron core and conducting wire realizes Technology design side
Case.The purpose of major technique: improving winding conducting wire resistivity, to improve the straight resistance of winding coil, enhances the damping of PT coil
The effect of D.C. resistance, further accordance with PT ferromagnetic resonance empirical data is inhibited, determines that resistivity mentions by verifying than difference and phase difference
High 3~8 times meet effectively requirement.The present invention is a kind of by summarizing the actually active inhibition ferromagnetic resonance damping resistance model of engineering
The problem of enclosing, changing the design less than normal of tradition PT winding D.C. resistance, the certain security application characteristic of imparting PT device itself it is new
Technical method and new mutual inductor.
A kind of inventive principle of the anti-resonant electromagnetic formula voltage transformer of high-damping is as follows:
At present both at home and abroad to the study on prevention of ferromagnetic resonance, for simplifying the analysis, cast out the excitation resistance of PT, reason mostly
Mainly excitation reactance ω LPTMuch larger than RPT, the two three orders of magnitude of difference.But when PT resonance occurs, the excitation electricity of PT
Anti- because of core sataration, numerical value sharply declines, to match with system direct-to-ground capacitance, forms resonance, at this point, the excitation reactance of PT with
Excitation resistance very close to.The damping action of resistance has been highly significant, and the present invention, which is exactly based on, considers excitation resistance
Solve this technical problem.This point is usually exactly had ignored by those skilled in the art.
By circuit theory it is found that when following formula is set up, there is concussion attenuation characteristic on the circuit, and gradually by transient state to surely
Determine state:
Ferromagnetic resonance typically occurs in the power distribution network of isolated neutral, is provided according to regulation, and such system is over the ground
Capacitance current is generally no greater than 10A.Current domestic technique status is considered simultaneously, and the feeder line extraction of overhead transmission line is also mostly electricity
The minimum value of cable, capacitance current can be calculated according to 5A.
When PT resonance occurs:
Formula (1), (2) simultaneous, obtain:
The frequencies omega of ferromagnetic resonance0Generally 17Hz, 25Hz, 50Hz, 150Hz, C0Range 0.92uF~1.84uF (be
System capacitive earth current corresponds to 5A~10A).It brings (3) formula into, can obtain the excitation resistance model for effectivelying prevent PT ferromagnetic resonance
It encloses:
RPT>=7.25k Ω~127.9k Ω
The excitation resistance of current country 10kVPT is generally 1k Ω~3k Ω, it is clear that can not prevent the generation of ferromagnetic resonance.
In practical application because directly hinder it is excessive will affect precision, comprehensively consider the ability that PT bears overload current, straight resistance is not less than 25k
Ω can significantly reduce ferromagnetic resonance probability, will not damage within the short time (such as 5min) ferromagnetic resonance occurs
Bad PT can be enabled so that operations staff has sufficient time disposition.
Mutual inductor correlation theory relationship:
Main flux in iron coreIt interlinks with first winding, induced electromotive force:
E1First winding induced electromotive force；
F- rated frequency
N1First winding the number of turns；
Iron core main flux；
It interlinks with secondary winding, induced electromotive force:
E2Secondary group of induced electromotive force；
F- rated frequency
N2Secondary winding the number of turns；
Iron core main flux；
When ignoring first winding zero load leakage impedance, and not considering unloaded leakage field to secondary influence, then first and second winding terminal
Voltage relationship:
Voltage deviation relationship:
Phase angle offset relation:
The factor for influencing deviation has no-load current, core loss angle, first winding resistance and unloaded leakage reactance, through the invention
The design of method is arranged, and matching correlation, which can achieve, meets voltage and the voltage transformer to angular displacement requirement, same to time-division
Cloth resistive component can achieve network system resonance damping requirements, thus may cause after solving voltage transformer access system
Ferromagnetic resonance problem.
Nominal definition of the invention:
Coil axial dimension 100mm, the i.e. height of mutual inductor coil.
Width is to size about 9mm, i.e. coil thickness size.
Iron core column is away from height 100mm, and iron core column wheelbase is from i.e. iron core width.
Window width 160mm, iron core height.
Straight resistance: electromagnetic potential transformer is made of iron core and winding two parts, and straight resistance just refers to the resistance of winding.
LPT: PT magnetizing inductance.
RPT: PT excitation resistance.
C0: system direct-to-ground capacitance.
A: for mutual inductor A phase input terminal.
B: for mutual inductor B phase input terminal.
C: for mutual inductor C phase input terminal.
The technology marked improvement of this patent and feature are: inventing a kind of high-damping electromagnetic potential transformer and mutual inductance side
Method rationally adjusts the resistive component and unloaded reactive component of mutual inductor winding coil by adjusting mutual inductor design parameter, and
The accounting of iron core active loss component and iron core excitation capacity allows mutual inductor voltage than difference and phase angle difference control in standard
In deviation range.Main implementation content is, according to network system distribution capacity section, to set the damping of mutual inductor winding distributed resistance
Parameter chooses high resistivity winding wire, matches primary side winding, primary side umber of turn, the resistive component of winding coil is added
Greatly, the technical purpose for reducing floating voltage error is realized, by reducing winding width for primary coil, the concentric coiling of secondary coil
To size, extending the modes such as axial distribution reduces the reactive component of winding.And unloaded phase error is then by choosing high magnetic conduction
Silicon strip increases core loss angle, adjusts unloaded phase angle error and meets the requirements.Load voltage difference can also be by reducing winding
Leakage reactance and turn compensation realize and reduce that load phase difference then can implement specific compensation according to secondary load property.This resistance
The biggish mutual inductor of component is that resistive component is evenly distributed in armature winding, and the distributed resistance parameter embodied in circuit can be with
It is effective to inhibit ferromagnetic resonance problem.
Detailed description of the invention
Fig. 1: power distribution network electricity PT resonance circuit figure.
Fig. 2: high-damping electromagnetic potential transformer structural schematic diagram.
In figure: 1. armature windings, 2. secondary windings, 3. iron cores, A-1. armature winding inlet wire, X-1. armature winding outlet,
A-2. secondary windings inlet wire, x-2, secondary windings outlet.
Specific embodiment
Implement a kind of anti-resonant electromagnetic formula voltage transformer of high-damping in the occasion that electric system needs power grid control to protect
And mutual sensing method.
A kind of anti-resonant electromagnetic formula voltage transformer of high-damping, including iron core 3, armature winding 1, secondary windings 2 composition；Mutually
The connection relationship of sensor is: voltage transformer voltage rating, sets primary side first as 10000/ √ 3V, 100/ √ of primary side
3V, 12000 circle of primary side umber of turn, 120 circle of low-pressure side；Primary side chooses 0.2mm enamel covered wire, and primary side chooses 1mm paint
Copper-clad line；Bilateral arrangement, coil axial dimension 100mm, width is to size 9mm；Iron core column is away from height 100mm, window width
160mm.Iron core 3 is rectangular hollow iron core, armature winding 1, secondary windings 2 around the concentric side of iron core 3 around.
A kind of anti-resonant electromagnetic formula mutual induction of voltage method of high-damping: design procedure is as follows:
10KV single-phase potential transformer, capacity 30VA design are as follows:
3 operating magnetic field flux density of iron core is chosen in 0.6~0.9T working range, 3 diameter 65mm of iron core, effective sectional area
26cm2, then have:
et=4.44fBS=0.481V
etWindingCirclePotential；
B- magnetic flux density；
The effective magnetic conductive area of S- iron core；
By iron core unit excitation capacity and iron-loss per unit weight, it is known that mutual inductor open-circuit excitation electric current is about 1.658mA, it is primary around
Group impedance 3.482M Ω calculates mutual inductor zero load output reactance X0=6.564M Ω, zero-load impedance resistance 2.669M Ω, iron core damage
Consume angleChecking offset relation has:
Voltage deviation:
Deviation is in ± 0.5% claimed range.
Phase angle differenceDeviation:
Deviation is in ± 20 ' claimed ranges.
By choosing high resistivity winding linear resistivity about 0.1724 Ω/mm2, unloaded output reactance is almost unchanged, unloaded
For impedance resistors up to 25M Ω, core loss angle is constant, and checking offset relation has,
Voltage deviation:
Deviation is in ± 0.5% claimed range.
Phase angle differenceDeviation:
The direct current resistance requirement of PT ferromagnetic resonance may be implemented in ± 20 ' claimed ranges in deviation after adjusting in this way.
Claims (1)
1. a kind of anti-resonant electromagnetic formula voltage transformer of high-damping, it is characterised in that: the anti-resonant electromagnetic formula electricity of the high-damping
Pressure mutual inductor includes iron core, armature winding, secondary windings composition；Connection relationship is: setting voltage transformer voltage rating first,
When primary side is 10000/ √ 3V, 100/ √ 3V of primary side, 12000 circle of primary side umber of turn, 120 circle of low-pressure side；Primary side
0.2mm enamel covered wire is chosen, primary side chooses 1mm enamel covered wire；Bilateral arrangement, coil axial dimension 100mm, width is to size
9mm；Iron core column is away from height 100mm, window width 160mm；Iron core is rectangular hollow iron core, and armature winding, secondary windings surround
The concentric side of iron core around.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821633044.8U CN208805810U (en) | 2018-10-09 | 2018-10-09 | The anti-resonant electromagnetic formula voltage transformer of high-damping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821633044.8U CN208805810U (en) | 2018-10-09 | 2018-10-09 | The anti-resonant electromagnetic formula voltage transformer of high-damping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208805810U true CN208805810U (en) | 2019-04-30 |
Family
ID=66238702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821633044.8U Withdrawn - After Issue CN208805810U (en) | 2018-10-09 | 2018-10-09 | The anti-resonant electromagnetic formula voltage transformer of high-damping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208805810U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109086562A (en) * | 2018-10-09 | 2018-12-25 | 云南电网有限责任公司红河供电局 | A kind of anti-resonant electromagnetic formula voltage transformer of high-damping and mutual sensing method |
-
2018
- 2018-10-09 CN CN201821633044.8U patent/CN208805810U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109086562A (en) * | 2018-10-09 | 2018-12-25 | 云南电网有限责任公司红河供电局 | A kind of anti-resonant electromagnetic formula voltage transformer of high-damping and mutual sensing method |
| CN109086562B (en) * | 2018-10-09 | 2023-09-12 | 云南电网有限责任公司红河供电局 | High-damping anti-resonance electromagnetic voltage transformer and mutual inductance method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1890369B1 (en) | Ground fault detection | |
| CN110445109B (en) | Method and device for rapidly eliminating ferromagnetic resonance of voltage transformer | |
| CN107796989B (en) | A kind of capacitance current of distribution network On-line Measuring Method | |
| CN108318762B (en) | Method for judging power frequency ferromagnetic resonance of voltage transformer | |
| CN108445336A (en) | A kind of active leakage current On-line Measuring Method of power distribution network | |
| CN110323731B (en) | Voltage transformer primary side neutral point controllable impedance resonance elimination device | |
| CN208805810U (en) | The anti-resonant electromagnetic formula voltage transformer of high-damping | |
| CN108459285A (en) | Ferroresonance Overvoltage Caused by PT experimental method | |
| CN109086562A (en) | A kind of anti-resonant electromagnetic formula voltage transformer of high-damping and mutual sensing method | |
| CN205609341U (en) | Harmonic elimination formula voltage transformer | |
| CN106158335A (en) | A kind of three-phase resonance-eleminating type voltage inductor | |
| CN111103499A (en) | Method for measuring ground parameters of power distribution network grounded through arc suppression coil series resistor | |
| CN113410035B (en) | Anti-resonance voltage transformer with grounding compensation function based on Y-shaped wiring | |
| Abdul-Malek et al. | Investigation of ferroresonance mitigation Techniques in voltage Transformer using ATP-EMTP Simulation | |
| Malek et al. | Effect of shunt capacitance on ferroresonance model for distribution Voltage Transformer | |
| Jianna et al. | Measurement technology of grounding capacitance of distribution network based on the graded adjustment of grounding transformer winding | |
| CN112993925A (en) | Neutral point grounding fault transition resistance calculation method through combined grounding mode | |
| Chen et al. | Measurement technology of ground parameters based on tap adjustment of grounding transformer winding for distribution networks | |
| Sutherland | Analysis of integral snubber circuit design for transformers in urban high rise office building | |
| CN206040418U (en) | Three -phase harmonic elimination formula voltage transformer | |
| CN215183490U (en) | Anti-resonance voltage transformer with grounding compensation function based on Y-shaped wiring | |
| Ren et al. | Research on Fuse Failure and Countermeasure of Potential Transformer in Non-effect Grounding System | |
| Zhang et al. | The compensation mothed for temperature rise test of 750kV magnetic controllable reactor | |
| Wang et al. | Study on ferromagnetic resonance characteristics and suppression measures of 10 kV distribution network | |
| Ren et al. | Study on fault waveform library of PT high voltage side fuse in hydropower station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190430 Effective date of abandoning: 20230912 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190430 Effective date of abandoning: 20230912 |