Sump pit design consideration and requirement for engineers
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Transformer Design
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Transformer Design
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ANNEXURE - 1
PLPL, 2x30 MW
SOAK PIT SIZING CALCULATIONS
29/11/2010
PLPL-2X30MW - SOAK PIT CALCULATIONS FOR TRANSFORMERS INPUT DATA Transformers Tranmsformer Dimensions Length (a) Width (b) Height (C) Oil Qty
12 MVA Ado ra 4.8 m 4.9 m 4.7 m 7.6 kL
10 MVA MV UAT 5.2 m 4 m 4.1 m 7.4 kL
2.5 MVA LV UAT 2.27 m 2.42 m 2.36 m 1.6 kL
=LXWXD
6.40 6.80 1.00 43.52
m m m m3
5.30 m 5.50 m 1.00 m 3 29.15 m
5.80 m 5.00 m 0.90 m 3 26.10 m
3.30 m 3.00 m 0.75 m 3 7.43 m
II Area Area occupie occupied d by Foundat Foundation ion Length Width Depth Total Volume occupied
=LXWXD
4.40 m 2.40 m 1.00 m 3 10.56 m
3.310 m 2.165 m 1.00 m 3 7.17 m
3.90 m 1.80 m 0.90 m 3 6.32 m
4.60 m 0.45 m 0.75 m 3 1.55 m
III Net Volume of soak pit
= Soak Pit Volume - Foundation Volume (I-II)
32.96 m
A TRAFO PIT CALCUL ATIONS I Trafo Trafo Soak Soak Pit Pit Dimen Dimensions sions Length Width Depth Total Volume
IV Volume Occupied by Gravel V Net Volume Volume availba availbale le for Oil Oil &Water &Water VI Surface Area of Transformer VII Qty of Water for 10 min VIII Total qty of Oil and Water IX Soak Soak Pit Pit size size required required
40 MVA GT 5m 5.3 m 5.7 m 13.6 kL
29.11.10
Considered as 70 % of Net Soak Pit Volume = Net Volume of soak pit - Volume occupied by Gravel = (axb) + 2(bxc) + 2(axc) = 10.2 lit / m 2 / min = Transformer oil qty + Water qty Considered as 1/3 of Qty of (Oil + Water)
3
21.98 m
3
15.3 15.39 9m
23.07 m
3
19.78 m
3
5.87 m
3
13.8 13.85 5m
3
3
4.11 4.11 m
3
3 9.89 m
3 6.60 m
3 5.93 m
3 1.76 m
2
2 114.70 m
2 96.24 m
2 27.63 m
14.68 KL
11.70 KL
9.82 KL
2.82 KL
28.28 KL
19.30 KL
17.22 KL
4.42 KL
3 9.43 m
3 6.43 m
3 5.74 m
3 1.47 m
143.92 m
Net Volume available > Oil + Water quantity , thus OK B MAIN SOAK PIT CALCULATION CALCULATIONS S Largest Oil qty + Water Qty +1 +10% Oil To t al Qt y o f Oi l + Wat er Slope of Pipe is 1: 100 mm Total Length of Pipe Slope PIT Dimensions Length Width Depth Depth of drain pipe Invert level of oil pit Depth of of oil pit from FGL Net Vo l u m e av ai al b l e f o r o i l + w at er Volume avlb > Oil+ Water qty , thus OK
Refer Input Data As Calculated above
= Length of pipe / Slope
= LXWXD
13.60 KL 14.68 KL 1.36 KL 29.64 K L
30000.00 mm 300.00 mm
6.00 m 3.50 m 1.41 m 1.50 m 3.01 m 2.71 m 3 29.64 m
7.40 9.82 0.74 17.96
KL KL KL KL
30000.00 mm 300.00 mm
6.00 m 2.50 m 1.20 m 1.40 m 2.70 m 2.40 m 3 17.96 m
1.60 2.82 0.16 4.58
KL KL KL KL
30000.00 mm 300.00 mm
2.50 m 1.50 m 1.22 m 1.25 m 2.57 m 2.27 m 3 4.58 m
