Process Inspection Customer

HV Y LV Y TV Delta
Capacity kVA Test Voltage
64.5 kV 6.9 kV 3.984 kV
Good
Design Turn Measured Ratio
1. Turn Ratio（Right Table） Criteria:±0.5％
Teritary/
Primary Secondar Ratio U V W
y
573 73(T) 7.849
573 73(S) 7.849
573+99
(PG) 73(S) 9.205
573+10X
9(PF) 73(S) 7.986
573+10X
9(PF) 73(S) 7.986
573+10X
9(PF) 73(S) 7.986
573+10X
9(PF) 73(S) 7.986
573+10X
9(PF) 73(S) 7.986
573+10X
Before Assembly Inspection

9(PF) 73(S) 7.986

573+10X
9(PF) 73(S) 7.986
573+10X
9(PF) 73(S) 7.986
573+10X
9(PF) 73(S) 7.986

2. Low Voltage Current （100V) U V W

Measured Voltage(v)

Measured Current (mA)

3 Measurement of Insulation Resistance (1000V) Before VPD process(CCA) After VPD process
Date Measured Criteria Date Measured Criteria
1 Core (125V) 0.1 MΩ 1 MΩ
2 Tightennig Bolt 1 MΩ 500 MΩ
3 Core Table 1 MΩ 500 MΩ
4 Coil 100 MΩ 2000 MΩ
5 Drawing Check
6 Core resistance Ω
note Judgement Tested By Approved By
 1. Ratio（Right Tabele） TAP Voltege measure
2. Polarity
3. Low Voltage Current (200V)
U V mA
4. Assembly Check
・Line Terminal
・Tap Lead
Ｖ Yd1（ Vw＞UVW>Vv≒Wv≒Ww )
UVW= V
After Assembly Inspection

Vv= V
v Vw= V
Ｕ,u
Ｗ Wv= V
w
Ww= V
Dd0 ,Yy0( UVW>Vw≒Wv>Vv≒Ww )
Ｖ UVW= V Judgement Tested By Approved By
Vv= V
v
Vw= V
Ｕ,
, u w Ｗ
Wv= V
Ww= V
Ｖ Dy11( Wv>UVW>Vv≒Vw≒Ww ) OLTC Tap Lead Placement
UVW= V
v
Vv= V
w
Vw= V
Ｕ,u Ｗ Wv= V
Ww= V
measurement Insulation Resistance
1. Core Criteria:more than 100MΩ
Before Tank put in Inspection

2. Tightennig Bolt Criteria:more than 500MΩ

3. Clamp Ring , Shield Criteria:more than 500MΩ
4. Core Table Criteria:more than 500MΩ
5. Coil（2000ＭΩ以上） Criteria:more than 2000MΩ
6. After Assembly OLTC
Measure Ratio
7. Connect Tap Judgement Tested By Approved By
8. TV Winding Separate Source kV mA
9. BCT Polarity Tighten Check
10. Earth Lead Check
11. Insulation Distance Drawing No

Serial Number
 1. Ratio（Right Tabele） Case TAP HV LV RATIO -0.05 ～ 0.05 Judgement Tested by
UV
P-S Ratio
(3Phase) 11(1) VW
WU
UV
P-S Ratio
(3Phase) 1(1) VW
WU
Case TAP HV LV RATIO -0.05 ～ 0.05 Judgement Tested by
UV
P-T Ratio
(3Phase) 11(1) VW
WU
After Assembly Inspection

UV
P-T Ratio
(3Phase) 1(1) VW
WU

2. Polarity Judgment Tested by Comments

Dd0 ,Yy0( UVW>Vw≒Wv>Vv≒Ww Yd1（ Vw＞UVW>Vv≒Wv≒Ww )
Ｖ
Ｖ UVW= V UVW= V
Vv= V Vv= V
v
Vw= V v Vw= V
Ｕ,
, u w Ｗ
Wv= V Ｕ,u
Ｗ Wv= V
w
Ww= V Ww= V

3. Low Voltage Current(200V) U V W

Measured voltage(v)
Measured Current(mA)

4. Assembly Check
・Line Terminal
・Tap Lead

Serial Number
 measurement Insulation Resistance
1. Core Criteria:more than 100MΩ
Before Tank put in Inspection

2. Tightennig Bolt Criteria:more than 500MΩ

3. Cramp Ring , Shield Criteria:more than 500MΩ
4. Core Table Criteria:more than 500MΩ
5. Coil（2000ＭΩ以上） Criteria:more than 2000MΩ
6. After Assembly OLTC
Measure Ratio
7. Connect Tap Judgement Tested By Approved By
8. TV Widing Separate Source KV mA
9. BCT Polarity Tighten Check
10. Earth Lead Check
11. Insulation Distance Drawing No

Serial Number