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发表于 2009-11-18 11:36:55
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Name : SatTrafo - General saturable transformer. 3 phase. 2 or 3 windings.
6 b" O) u6 W4 y* X$ I% B Wye, Delta with all phase shifts. Auto, and Zigzag with most common configurations.
`8 ?4 ]& |, H) g1 q8 d wCard : BRANCH6 ]+ _3 o9 q4 _3 @ g8 m: R
Data : Io= Current [A] through magnetizing branch (MB) at steady state.
+ c: { X7 U; {4 `& A9 ^: o( }! b Fo= Flux [Wb-turn] in MB at steady state.6 u5 b* R+ N( n' `4 f/ ?, x& E
The pair Io, Fo defines the inductance in MB at steady state.2 J, {; T; }! k% d
Rm= Resistance in magnetizing branch in [ohm]. 5-leg core or 3-leg shell.
5 S% y5 B5 s/ m8 k3 z. ?" D- d The magnetizing branch is always connected to the PRIMARY winding and Rm is referred to this voltage.
K X' p+ D: g" V1 Y R0= Reluctance of zero-sequence air-return path for flux. 3-leg core-type
- V( C, I. W8 l- C Vrp= Rated voltage in [V] primary winding (only the voltage ratios matter).& O/ I) L% _3 A; ]9 W9 _5 b
Rp= Resistance in primary winding in [ohm].
. [+ [' V8 o- i. O2 H+ M3 l Lp= Inductance in primary winding in [mH] if Xopt.=03 [# H8 W( U0 Y% ]* l% G
Inductance in primary winding in [ohm] if Xopt.=power freq.% q3 @+ R4 L; X8 D$ F5 N6 z
Vrs= Rated voltage in [V] secodary winding. / {8 K) T& p G( F+ W0 h% w- c& P% t
Rs= Resistance in secondary winding in [ohm].
" E" P( C1 G" X: a- U5 W Ls= Inductance in secondary winding in [mH] if Xopt.=0# ^5 |9 }3 W4 V: X+ a1 i
Inductance in secondary winding in [ohm] if Xopt.=power freq.
; @, s; S. A* B4 F Vrt= Rated voltage in [V] tertiary winding.* y+ K9 ]3 X" C. B& f& T( N/ U/ A+ w
Rt= Resistance in tertiary winding in [ohm].
! d2 s1 @8 |1 l Lt= Inductance in tertiary winding in [mH] if Xopt.=0
$ d, v* h, T5 `# N1 _: X Inductance in tertiary winding in [ohm] if Xopt.=power freq. & Q# L Q4 r; q3 F, W
RMS= unchecked: Current/Flux characteristic must be entered.' F0 l) @1 q- x8 T6 K
checked: Irms/Urms characteristic must be entered.
! k# g# f- e, |# h ATPDRAW performs a SATURATION calculation.$ Y$ {% ]# H+ T$ b6 g7 [
3-leg core = checked: 3-leg core type transformer assumed. TRANSFORMER THREE PHASE: Q8 p' W$ p$ `
unchecked: 5-leg or 3-leg shell type assumed. TRANSFORMER.
- X/ d( ~( ]/ t1 w6 C% D 3-wind.= turn on tertiary winding.
5 q9 x9 }. r/ e% sOutput specified the magnetization branch output (power&energy not supported).
# g- ]+ y" h& k! w, Z2 ENode : P= Primary side. 3-phase node.
. X# \+ L7 Y' ~: m3 K S= Secondary side. 3-phase node.: B$ y0 A, x7 A1 J8 j0 }
PN= Neutral point primary side.
3 j j) I1 [2 s. q8 a SN= Neutral point secondary side.2 R7 b6 z, |" ]
T= Tertiary side. 3-phase node.
# }; Z& z8 M4 b TN= Neutral point tertiary side.9 k4 t* T9 X0 @- Y7 m j
Sat= Internal node, connection of the magnetization circuit with saturation.1 {. t0 C9 ~3 v% |3 c: f6 h: E+ a
The coupling is specified for each winding, with four coupling options: Y, D, A, Z
+ J: B4 r6 A4 ]: f; L9 R$ k$ C All phase shifts are supported.& a, |* B6 B; t7 ^/ w/ Y7 S8 O
Special note on Auto-transformers:
, ]. s& Z3 Z4 ~, k7 h u5 y The primary and secondary windings must be of coupling A(uto).( j# b' | c1 ?. z [ y
Special note on ZigZag-transformers:
6 U! u, L- ^3 u9 B4 S' F6 D: g For this type the user can specify a phase shift in the range <-60,0>&<0,60>.
! a5 o; R$ X8 x) p! @ Note that the values -60, 0 and +60 degrees are illegal (as one of the winding parts degenerates).2 B! d, ]4 Y$ U7 S+ D h+ z/ Y
The phase shift is given relative to a Y-coupled winding. . _2 P" _" K8 G/ N8 Y) [
If the primary winding is Zigzag-coupled, all other windings will be shifted with it.5 z x- H0 D" h; T9 |) s: n& k! P5 {9 ~
If the primary winding is D-coupled, 30 deg. must be added/subtracted to the phase shifts. Y* c3 Q( i( v& b( D+ M
For negative phase shifts the phase A winding starts on leg 1 (called z with voltage Uz)
$ D; \6 t h! j and continues in the opposite direction on leg 3 (called y with voltage Uy).
2 M" J, [, q$ S For negative phase shifts the phase A starts on leg 1 1 s8 S5 E. N& q2 K( r' D( E
and continues in the opposite direction on leg 2.
: y2 a4 O' i4 k. r d/ c) h$ d The normal situation is to specify a phase shift of +/- 30 deg.
; h' ]5 e- d5 S3 n } in which case the two parts of the winding have the same voltage level and leakage impedance.
) P1 c" B+ f' u, h) A: J In general the ratio between the second part of the winding Uy and the first part Uz is
3 N* ], e4 k$ U, y; A3 ^3 v n=Uy/Uz=sin(a)/sin(60-a) where a is absolute value of the phase shift.4 g* i; O! @! n& v4 c& H
This gives:
( k n& i1 O* ? Uz=U/(cos(a)+n*cos(60-a)) and Uy=Uz*n
$ H% z: o Y- W, k { Lz=L/(1+n*n) and Ly=Lz*n*n, Rz=R/(1+n) and Ry=Rz*n ! f4 W& F3 n1 L% |
where Lz and Ly are the leakage inductance of each part of the winding (L is the total leakage inductance)
9 J- x" l/ z4 P and Rz and Ry are the winding resistance of each winding part (R is the total).9 ]4 @" N7 L, l
The parameters Uz, Uy, Zz, and Zy are automatically calculated by ATPDraw based on the 6 U @) C& c. E( s/ y% v# W
equivalent parameters U and Z and the phase shift, a. ]* [1 o1 ? p; ]
& S" b) j- ~" Q% R8 g# _
6 t. @0 S- t" LPoints: It's possible to enter 9 points on the current/flux characteristic.
* X: s2 m% o8 j6 n% `0 C The required menu is performed immedeately after the input menu.% U; A2 m e: d
The points should be entered as increasingly larger values. / o+ B% z8 e* Q! ~, N0 F$ o
The point (0,0) is not permitted (added internally in ATP).* o& R& j1 j4 U/ O. v. X( D" B8 A! `1 r
RuleBook: IV.E.1-2 or 3. |
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