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80 MVA Transformer, Off load Tap Changing Type, Onan Cooling, Rated voltage 66±2×2.5% / 11.5 kV50 HZ, Year 2011, Test Report 2016, Manufacture Chint. Very good condition,

RATING

 

80 MVA
RATED VOLTAGE ( 50Hz )

 

66±2×2.5%  /  11.5 kV

 

NO OF PHASESThree Phase
TYPE OF COOLINGONAN/ONAF
YEAR OF MANUFACTURE2011
TAP CHANGER TYPE

 

OFFLOAD

1.2 GENERAL CHECKS:

DescriptionRemarks
Primary Voltage selector switchOK
Earthing connection satisfactoryOK
All Protection Covers fittedOK
All rating, diagram, ID plates fitted & satisfactoryOK
Tightness of all fastenersOK

80 MVA Transformer

  1. INSULATION RESISTANCE MEASUREMENT:
         DescriptionR 60 seconds (GΩ)Remarks
HV to LV + Earth (5000V)64.8 GΩok
HV to LV  (5000V)42.1 GΩok
LV to HV + Earth (5000V)72.5 GΩok
Core to Earth ( 500 V )9.87 GΩok
Core Clamp to Earth ( 500 V )6.90 GΩok

3.1 TURNS RATIO TEST:  A Phase

HV (  0 – A  )                   LV (  a – c  )

 

HV

 

LV

 

Applied  Voltage on HV

 

 

 

Measured Voltage on LV

Measured Turns Ratio 

Magnetizing Current mA

 

Tap

 

 

Voltage

( V )

 

Tap

 

 

Voltage

( V )

169300 

 

 

/

 

 

 

11500

499.90144.363.463024.90
267650499.88147.633.386025.84
366000499.87151.653.296227.09
464300499.80155.903.206527.24
567200499.90159.733.129528.51

3.2 TURNS RATIO TEST:   B Phase

HV (  0 – B  )                   LV (  b – a  )

 

HV

 

LV

 

Applied  Voltage on HV

 

 

 

Measured Voltage on LV

Measured Turns Ratio 

Magnetizing Current mA

 

Tap

 

 

Voltage

( V )

 

Tap

 

 

Voltage

( V )

169300 

 

 

/

 

 

 

11500

499.83143.643.480313.91
267650499.89155.063.313614.48
366000499.89150.863.223615.21
464300499.88146.883.203315.44
567200499.84158.843.146915.99

3.3  TURNS RATIO TEST:  C Phase

HV (  0 – C  )                   LV (  b – c  )

 

HV

 

LV

 

Applied  Voltage on HV

 

 

 

Measured Voltage on LV

Measured Turns Ratio 

Magnetizing Current mA

 

Tap

 

 

Voltage

( V )

 

Tap

 

 

Voltage

( V )

169300 

 

 

/

 

 

 

11500

499.89143.743.477817.23
267650499.88146.983.400917.69
366000499.88150.973.311218.54
464300499.89155.183.221419.49
567200499.89158.973.144520.37

4.1  WINDING RESISTANCE TEST:  HV SIDE

HV Windings 0 -A                                              Ambient Temp:  45ᵒC

 

HV

 

WINDING RESISTANCE

m

 

 

DC  I

A

 

 

DC  mV

 

Tap

 

 

Voltage

( V )

16930061.176.8167417.01
26765060.666.8160413.45
36600056.156.8195382.89
46430056.296.8143383.56
56720056.036.6826382.45

 

4.2  WINDING RESISTANCE TEST:  HV SIDE

HV Windings   0 – B                                     Ambient Temp:  45ᵒC

 

HV

 

WINDING RESISTANCE

m

 

 

DC  I

A

 

 

DC  V

 

Tap

 

 

Voltage

( V )

16930058.996.8122400.21
26765058.736.8145401.82
36600057.446.8188391.69
46430054.736.8134372.91
56720054.266.8186369.99

4.3  WINDING RESISTANCE TEST:  HV SIDE

HV Windings   0 – C                                           Ambient Temp:  45ᵒC

 

HV

 

WINDING RESISTANCE

m

 

 

DC  I

A

 

 

DC  V

 

Tap

 

 

Voltage

( V )

16930066.996.8122456.34
26765064.766.8086440.95
36600064.636.8042439.73
46430063.196.8096430.27
56720062.816.8141427.96

 

5.1  WINDING RESISTANCE TEST:   LV SIDE

LV Windings   a – b                                                                                Ambient Temp:  45ᵒC

 

LV

 

WINDING RESISTANCE

m

 

 

DC  I

A

 

 

DC  V

 

Tap

 

 

Voltage

( V )

 

a  –  b

 

11500

3.404 

6.8426

 

23.289

80 MVA Transformer

5.1  WINDING RESISTANCE TEST:   LV SIDE

LV Windings   b – c                                                                                 Ambient Temp:  45ᵒC

 

LV

 

WINDING RESISTANCE

m

 

 

DC  I

A

 

 

DC  V

 

Tap

 

 

Voltage

( V )

 

b  –  c

 

11500

3.504 

6.8566

 

24.022

5.1  WINDING RESISTANCE TEST:   LV SIDE

LV Windings   c  –  a                                                                              Ambient Temp:  45ᵒC

 

LV

 

WINDING RESISTANCE

m

 

 

DC  I

A

 

 

DC  V

 

Tap

 

 

Voltage

( V )

 

c  –  a

 

11500

3.502 

6.8606

 

25.305

About Transformers

80 MVA Transformer

Overview

  • Category : Transformer
  • Item Number : P80
  • Offer Type : For Sale
  • Quantity : 1
  • Manufacture : Ch
  • Condition : Used
  • Voltage : 66±2×2.5% / 11.5 kV
  • Frequency : 50 HZ
  • Phase : 3
  • Cooling : Onana
  • Year of Manufacture : 2011