Calculation of IBIAS in RET670 For Yd1 Transformer Ver2 [PDF]

Zitiervorschau

DIFF CHARACTERISTIC Idiff EndSlope1[p.u] EndSlope2[p.u] Slope1[%] Slope2[%]

Nom values of current 0.3 0.6 3 33.3 66.6

0.5784435857 For any angle of injection between 0

p.u. of nominal curren sec inj current values 3.3677 2.20948 2.651376

CALCULATION OF DIFFERENTIAL CURRENTS HV I1 I2 I3

Magnitude [A] Angle 2.2094801154 2.2094801154 2.2094801154

LV I1 I2 I3

Magnitude [A] Angle 2.6513761385 2.6513761385 2.6513761385

IDL1 IDL2 IDL3

Absolute secondary value 1.3119555091 0.6559777546 0.6559777546

52.89 -120 120 2 150 30 270

Angle in Rad 0.9231046414 -2.0943951024 2.0943951024 Angle in Rad 2.617993878 0.5235987756 4.7123889804

Re 1.333084 -1.10474 -1.10474 Io -0.876397 Re -2.296159 2.296159 -4.87E-16 Io 0

Abs Ref (HV) value 524.782203649 262.3911018245 262.3911018245

CURRENT CONTRIBUTIONS to fundamental frequency differential current HV IA IB IC

Re 650.086309784 -325.043154892 -325.043154892

Im 469.8701842553 -1000.321455764 530.4512715087

Total 802.1160765255 1051.8060978165 622.118641408

3ph FAULTS Angle of inj in Rph Angle of inj in Yph Angle of inj in Bph phi inj 30.3867953792 -89.6132046208 150.3867953792

-233.7057 116.8529 116.8529

DIFF 3PH 463.2448614425 1PH FAULTS Wanted BIAS [p.u.] DIFF acc to CHARACT 4 1.7652 Minimum Iinj 3.2915026221 Injected current [p.u.] 3.3677 phi1

73.4690304802

phi2

51.6822411819

3.5632627609 4.696842 463.2448614425 A t1 t2

PHI

46.2971711528

1.4322 1.7652 Function of inj angle Iinj -217.31172966

1.0992

VALID p

3.3610455311

262.23186208

a

69814.12

q

-206.14510336

b

13350.66

r

-32.381705245

c

-26269.75

Nom values of current

HV HV, sec CT 262.431940541 0.656079851

LV

LV, sec CT 1574.5916432444 0.787295822

ngle of injection between 0 and 90 degrees, this should be lower then 11

Im 1.762013191 -1.91346591 1.913465909 1.762013191 Im 1.325688069 1.325688069 -2.65137614 0

469.8701843 -234.935092 -234.935092

Primary values 883.792046159 883.792046159 883.792046159 262.391101824

Re 533.2334416 -441.8960231 -441.8960231 LV to HV Re 5302.75227695 -0.382693182 5302.75227695 0.382693182 5302.75227695 -8.1175E-17 0

Im Percentage of rated current 704.8052763829 3.3677 -765.386363636 3.3677 765.3863636364 3.3677 Im

Normalized to Primary side [p [A] 0.2209480115 3.3677 1060.550455 0.2209480115 3.3677 1060.550455 -0.4418960231 3.3677 1060.550455

-765.3863636 441.8960230795 765.3863636 441.8960230795 -1.6235E-13 -883.792046159

IBIAS 1051.8060978165 A LV IA IB IC

4.0079195225 p.u. Re Im -883.79204616 0 441.89602308 765.3863636 441.89602308 -765.3863636

Total 883.792046159 883.792046159 883.792046159 883.792046159

a

b c 28 48.8110087146 21.06032011

root 4.8742916988

0.958666079 0.784584232

DIFF VALUE for 1PH faults 1.3440882 235.1544497226 1.2216441 1.3440882

3.645751311

3PH 1PH root

DIFF as function of Iinj and angle of injection 2.9995331508 p.u. 787.1733054735 A 524.782203649 A 1.9996887672 p.u.

86684.7006815

t1

0.7164407031

phi1

45.7613947586

t2

-0.5252091997

phi2

-31.6823275432

IBIAS = f(Iinj,phi) 4.5 4

IBIAS

3.5 3 2.5 2 1.5 1 0.5 0 0

10

20

30

40

50 60 phi(degrees)

0.5 0 0

10

20

30

40

50 60 phi(degrees)

phi Sn [MVA] UHV [kV] HVCTprim [A] HVCTsec [A] ULV [kV] LVCTprim [A] LVCTsec [A] nu

30 66 400 1 11 2000 1 6

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

IBIAS (Iinj, phi) 3.3677 3.384596 3.401346 3.417948 3.434399 3.450696 3.466836 3.482816 3.498634 3.514287 3.529773 3.54509 3.560234 3.575203 3.589995 3.604608 3.61904 3.633288 3.64735 3.661223 3.674907 3.688399 3.701696 3.714797 3.727701 3.740404 3.752906 3.765205 3.777298 3.789185 3.800862 3.81233 3.823586 3.834629 3.845457 3.856068 3.866462 3.876637

38 3.886591 39 40 41 42 43 44 45 46 47

3.896324 3.905833 3.915118 3.924177 3.93301 3.941614 3.94999 3.958135 3.966049

0

48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90

IBIAS = f(Iinj,phi)

50 60 phi(degrees)

70

80

90

100

3.973731 3.98118 3.988394 3.995374 4.002117 4.008624 4.014892 4.020923 4.026714 4.032265 4.037575 4.042645 4.047472 4.052056 4.056398 4.060495 4.064349 4.067958 4.071322 4.07444 4.077312 4.079938 4.082318 4.08445 4.086336 4.087974 4.089364 4.090507 4.091402 4.092048 4.092447 4.092597 4.0925 4.092154 4.09156 4.090718 4.089629 4.088291 4.086706 4.084873 4.082793 4.080466 4.077893

0

50 60 phi(degrees)

70

80

90

100