CN2344908Y - Resonance-proof arc-suppression coil - Google Patents
Resonance-proof arc-suppression coil Download PDFInfo
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- CN2344908Y CN2344908Y CN 98236394 CN98236394U CN2344908Y CN 2344908 Y CN2344908 Y CN 2344908Y CN 98236394 CN98236394 CN 98236394 CN 98236394 U CN98236394 U CN 98236394U CN 2344908 Y CN2344908 Y CN 2344908Y
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- resonance
- suppression coil
- voltage
- arc
- compensating
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Abstract
The utility model relates to a resonance-proof arc-suppression coil, which is composed of an inductor Lp and resonance-proof impedance Zf which are connected in series, and the Zf is composed of a nonlinear inductor Lf, a resistor Rf, and a capacitor Cf which are connected in parallel. The utility model can be used individually and can be also connected with a 6KV, a 10KV, and a 35KV electric networks with arc extinguishing coils in parallel, and normal value of a compensating current is 5 amperes or 6 amperes. The utility model can be used with a large and a medium size extinction coils side by side, and the grounding electric networks of the extinction coils can operate in any one compensating area of an over compensating area, a full compensating area, and an under compensating area. The resonance-proof arc-suppression coil has the advantages of flexible and simple adjustment, and in a full compensating range, the resonance-proof arc-suppression coil avoids occurrence of an over-voltage phenomenon of neutral point displacement caused by a disconnection fault of trolley wires.
Description
The utility model relates to a kind of power network neutral ground equipment, is in particular the anti-resonance arc suppression coil.
There is the 6-35 kv grid of some in China, and the mode through grounding through arc is adopted in its neutral ground, though these arc suppression coils have functions such as compensation, extinguishing arc and anti-ferro resonance, can effectively improve the electric power netting safe running level.But because these arc suppression coils do not have the anti-resonance performance, when the arc suppression coil inductance constitutes resonance tuning with electrical network three-phase ground capacitance coupling, with produce neutral point over the ground power-frequency voltage surpass the neutral point displacement overvoltage of phase voltage, threat electric power netting safe running.For avoiding above-mentioned phenomenon to take place, arc suppression coil is adjusted must be limited in the stenosis area greater than certain overcompensation degree and is moved, even but like this,, can't avoid fully because of the caused neutral point displacement overvoltage of disconnection fault to 6,10 kilovolts of arc suppression coil earthing electric networks.
The purpose of this utility model is at the existing problem of above-mentioned neutral ground arc suppression coil, be intended to design a kind of adjusting and need do not limit the compensating basin, can all realize normal operation in the compensating basin scope, and the arc suppression coil that can avoid neutral point displacement overvoltage phenomenon to take place.
The implementation of the utility model purpose is that the anti-resonance arc suppression coil is by inductance L p and anti-resonance impedance Z
fSeries connection constitutes, Z
fBy nonlinear inductance
, resistance R
f, capacitor C
fForm side by side.
The load voltage value that the utility model is used for 6,10,35 kv grids is respectively 3637 volts, 6062 volts, 21218 volts, offset current be 6,10 kilovolts be 5 the peace, 35 kilovolts be 6 the peace.Choose reasonable Lp, R
f, C
fValue, and design and Lp, R
f, C
fThe value matched well
Nonlinear characteristic can make the utility model possess following characteristics:
1, nonlinear inductance
Make iron core by the high-quality cold-reduced silicon sheet, wind with coil and make, design
Iron core degree of depth saturation voltage value is about 20% of anti-resonance arc suppression coil load voltage value, makes this coil in power supply do electricity consumption is phase voltage 0.2-1.4 scope doubly, Lp and Z
fThe impedance of series connection is rendered as the very little induction reactance of nonlinearity, thereby has functions such as compensation, extinguishing arc and anti-ferro resonance.Though contain harmonic current in the offset current, during because of single-phase earthing, source impedance is an induction reactance, and the effect magnitude of voltage is a phase voltage, and numerical value height, harmonic current are less relatively, thereby compensation, arc eliminator are not had influence.
2, when electrical network normally moves, because the voltage that acts on this coil is low,
The iron core unsaturation, Lp and Z
fThe impedance of series connection is rendered as resistive impedance, so this coil can all avoided resonance tuning in the compensation range.
3, during electrical network generation disconnection fault, the neutral point of electric network asymmetrical voltage is raise,
The iron core degree of depth is saturated, electrical network three-phase ground capacitance and Lp, Z
fThe loop that constitutes, under the effect of neutral point asymmetrical power supply voltage, electric current enlarges markedly, and harmonic component is corresponding also big, and this moment is owing to exist non-linear element in the loop
And the harmonic current that produces, can effectively suppress resonance tuning, so the unlikely neutral point displacement overvoltage that causes.
4, R
fResistance can effectively prevent
The ferro resonance that causes.
The utility model can be separately, also can and arc suppression coil insert electrical network side by side and use, be described further with the accompanying drawing illustrated embodiment below.
Fig. 1 the utility model structure and winding diagram
Fig. 2
Nonlinear characteristic design implementation figure
Fig. 3 inserts electric network wiring scheme separately
Fig. 4 Fig. 3 analytical calculation circuit diagram
Fig. 5 and arc suppression coil insert electrical network figure side by side
Fig. 6 Fig. 5 analytical calculation circuit diagram
With reference to Fig. 1, inductance L p and impedance Z
fSeries connection, Z
fBy nonlinear inductance
, resistance R
f, capacitor C
fCompose in parallel R
f, C
fWithstand voltage, thermal capacity should with
Degree of depth saturation voltage be complementary.
Fig. 2 is used for the anti-resonance arc suppression coil that 35 kv grids, offset current are 6A
The nonlinear characteristic design drawing, U among the figure
f, I
fRepresent with effective value that all its nonlinear inductance characteristic is shown in curve among the figure.
Fig. 3 inserts the instance graph of 35 kv grids separately for offset current is 6 peaces, and its anti-resonance performance is calculated and undertaken by Fig. 4.1 is the respective electrical indentation wiring T that arbitrarily downgrades for 6-35 kv grid, 2 among Fig. 3
0Change, 3 is the anti-resonance arc suppression coil.U among Fig. 4
0Be the neutral point asymmetrical voltage of electrical network 1, C
GThree-phase ground capacitance for electrical network 1.1/3R
T0Be T
0Become 2 1/3 zero sequence resistance, 1/L
T0Be T
0The 1/3 zero sequence inductance that becomes, R
LpEquivalent loss resistance for the Lp inductance.Anti-resonance arc suppression coil parameter is: R
Lp30 Europe, Lp reactance value X
Lp2829 Europe, C
fCapacitor value 3100 Europe, R
fBe worth 10 kilo-ohms,
Linear characteristic shown in Fig. 2 curve, 1/3R
T0Europe, 1/3L
T0Reactance value 50 Europe.
When electrical network normally moves,
The iron core unsaturation time, iron core magnetic is close gets 16 kilogauss, and takes into account
Excitation reactance and equivalent shunt loss resistance, when trying to achieve voltage≤1244 volt on this anti-resonance arc suppression coil 3 by general algorithmic method, the impedance between P, m point is 1153-1153 Europe.The phase voltage U φ of 35 kv grids is 21218 volts.When unbalanced earth fault capacitance current is 15A, C
GWhen being 2.25 microfarads, calculate U
0Maximum permissible value be 2065 volts, greater than the normal U of electrical network
0Value (3%U φ).Neutral point displacement voltage is 1281 volts, normally allows U less than electrical network
0Value (0.15U φ) is so electrical network can normally move.
When electrical network overhead wire generation catastrophe failure, U
0Value raises,
Iron core to enter the degree of depth saturated, loop current increases, the harmonic component of loop current also increases.Take into account the phase relation between each voltage in the loop, U
0Fundamental frequency voltage should balance each other with other each voltage sum of loop.Other voltage is C
G, last both fundamental voltage difference and the comprehensive harmonic voltage of Lp be poor, fundamental voltage on the loop resistance and comprehensive harmonic voltage, 1/3L
Tp, L
fOn fundamental voltage and comprehensive harmonic voltage.When establishing C
GPower frequency capacitive reactance numerical value equate that with the power frequency induction reactance numerical value of Lp when being 2829 Europe, loop fundamental frequency electric current is that 5.5 peaces, comprehensive harmonic current peak value are 20% of fundamental current spoke value.Phase voltage U φ gets 21218 volts, calculates the superpotential U of neutral point displacement not occur
0Maximum permissible value is 0.62U φ.And work as C
GCapacitor value when being greater than or less than 2829 Europe, try to achieve U
0Maximum permissible value all greater than 0.62U φ.All feeders of electrical network-all break away from mutually under the extremely asymmetric situation of power supply, producing the non-confrontational voltage of neutral point is 0.5U φ, because of 0.62U φ＞0.5U φ, the requirement of neutral point displacement overvoltage do not occur so can satisfy.
With reference to Fig. 5,4 is the big or middle capacitance current electrical network of 6-35 kilovolt, and 5 are the respective electrical big or middle capacity T that arbitrarily downgrades
0Become, 6 are this anti-resonance arc suppression coil for the respective electrical arc suppression coil, 3 of arbitrarily downgrading.Fig. 6 is that 6 peace these coils and offset currents are the computational analysis figure that the arc suppression coil of 50A is used in 35 kv grids side by side.Same Fig. 4 of parameter between P, m point among the figure, other parameter is: R
LK4.5 the reactance X of Europe, Lk
LK424.4 Europe 1/3R
T02.5 Europe, 1/3L '
T0Reactance value 4 Europe.
Under the normal operation, L
fThe iron core unsaturation, in the time of P, m point voltage≤1244 volt, the impedance between P, m point is " 1153-1153 " Europe, with impedance " 4.5+1424.4 " Ou Binglian between this impedance and h, m point, calculates after constituting the loop with left branch again.Getting phase voltage value U φ is 21218 volts, when unbalanced earth fault capacitance current is 54.3 ampere-hours, tries to achieve U
0' minimum permissible value be 460 volts, neutral point displacement voltage is 1258 volts, and the U under the normal operation of electrical network
0' be no more than 0.02U φ, be 425 volts, less than 460 volts of minimum permissible values, trying to achieve neutral point displacement voltage is 1258 volts, less than normal permissible value 0.15U φ, so electrical network can normally move.
When serious disconnection fault takes place electrical network overhead wire feeder, calculate and the superpotential U of neutral point displacement do not occur
0' maximum permissible value, in the time of must calculating earlier the electrical network unbalanced earth fault capacitance current and be different numerical value, see from h, m left side into different power frequencies inlet resistance values (from h, m left side see into the impedance of each harmonic inlet, can see zero as, result of calculation is not had influence), contain non-kind of thread elements with right side p, f, m respectively again
Branch road calculates.Calculate: when the electrical network unbalanced earth fault capacitance current is respectively 35A, 40A, 50A, 60A, 65A, the superpotential U of neutral point displacement do not occur
0' maximum permissible value is respectively 0.59U φ, 0.39U φ, 0.116U φ, 0.113U φ, 0.154U φ.From result of calculation, unbalanced earth fault capacitance current is 35A, 40A and 35A when following, U
0' permissible value height can meet the demands.And when being 60A, U
0' permissible value is 0.113U φ.And to produce the U of 0.113U φ
0', have only when overhead wire feeder three-phase ground capacitance electric current up to 17A, a complete mutually broken string just can occur when breaking away from power supply, the notion that this situation occurs is very little.This be because, overhead wire feeder capacitance current is big, be since the line end high pressure with the indoor high-tension cable that is connected to, and the high-voltage cable that the general high voltage user connects is very short, by design, its three-phase ground capacitance electric current should be no more than 10A, takes this as the standard, aforementioned calculation explanation all can be satisfied and the requirement of neutral point displacement overvoltage not occur.
From above analytical calculation explanation, the utility model can be separately, also can insert electrical network side by side with arc suppression coil uses.All can guarantee electrical network normally operation in whole compensation ranges during use, and adjust flexibly, easy, and can avoid taking place because of the caused neutral point displacement overvoltage of overhead wire disconnection fault phenomenon.
Claims (2)
1, anti-resonance arc suppression coil is characterized in that by inductance L p and anti-resonance impedance Z
fSeries connection constitutes, Z
fBy nonlinear inductance
, resistance R
f, capacitor C
fForm side by side.
2, coil according to claim 1 is characterized in that nonlinear inductance
Be to make iron core, wind with coil made by the high-quality cold-reduced silicon sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98236394 CN2344908Y (en) | 1998-09-23 | 1998-09-23 | Resonance-proof arc-suppression coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98236394 CN2344908Y (en) | 1998-09-23 | 1998-09-23 | Resonance-proof arc-suppression coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2344908Y true CN2344908Y (en) | 1999-10-20 |
Family
ID=33984463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98236394 Expired - Fee Related CN2344908Y (en) | 1998-09-23 | 1998-09-23 | Resonance-proof arc-suppression coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2344908Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741074B (en) * | 2008-11-12 | 2012-11-14 | 苏俊连 | Ship power fault current limiting device |
| CN103490404A (en) * | 2013-09-11 | 2014-01-01 | 广西电网公司电力科学研究院 | Tuning method of following-setting-type arc suppression coil of power distribution network system and fault line selection method |
-
1998
- 1998-09-23 CN CN 98236394 patent/CN2344908Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741074B (en) * | 2008-11-12 | 2012-11-14 | 苏俊连 | Ship power fault current limiting device |
| CN103490404A (en) * | 2013-09-11 | 2014-01-01 | 广西电网公司电力科学研究院 | Tuning method of following-setting-type arc suppression coil of power distribution network system and fault line selection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |