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Report On Transformer Pre - Commissioning: A) VECTOR GROUP TEST: Tick Appropriately

The document provides a report on pre-commissioning tests conducted on a transformer. It details the vector group testing where voltages were measured under different conditions to check the vector group. Magnetic balance testing was also conducted by applying voltages to individual windings and measuring in other windings. No load current testing was performed by applying different voltage tappings and measuring the corresponding magnetizing current and losses. The conclusions drawn were that the vector group and magnetic balance testing results were satisfactory and the no load losses and currents were within tolerance limits.

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431 views2 pages

Report On Transformer Pre - Commissioning: A) VECTOR GROUP TEST: Tick Appropriately

The document provides a report on pre-commissioning tests conducted on a transformer. It details the vector group testing where voltages were measured under different conditions to check the vector group. Magnetic balance testing was also conducted by applying voltages to individual windings and measuring in other windings. No load current testing was performed by applying different voltage tappings and measuring the corresponding magnetizing current and losses. The conclusions drawn were that the vector group and magnetic balance testing results were satisfactory and the no load losses and currents were within tolerance limits.

Uploaded by

mohan babu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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REPORT ON TRANSFORMER PRE - COMMISSIONING

REPORT NO & DATE : /ELE/827/ dtd


PROJECT: CONTRACTOR:
CONSULTANT:
TRANSFORMER R/P DETAILS :
MAKE & MFG SR NO.:
TEST DATE : WEATHER: AMB TEMP:
MEASURING INSTRUMENTS - DETAILS:
Sr no. INSTRUMENT MAKE MFG's SR NO RANGE CALIBRATION VALID

1 IR TESTER WITH PI MEASUREMENT


2 DIGITAL MULTIMETER (WITH FLEXI)
3 WINDING RESISTANCE METER
4 TRANSFORMER RATIO METER

A) VECTOR GROUP TEST : Tick Appropriately.


Isolate Primary / Secondary Neutral Earth.
Short 1U - 2U, Apply 3 Phase 415 V to 1U - 1V - 1W terminals.
Measure following voltages :
Conditions :
(A) YNd11:
Condition - 1: 1U-1W ( ) = 2U-2W ( ) + 1W-2W ( )
Condition - 2: 1V-2V ( ) = 1V-2W ( )
Condition - 3: 1V-2U ( ) > 1V2W ( )

(B) YNyn0:
Condition - 1: 1U - 2N ( ) + 2N - 1N( ) = 1U - 1N ( )
Condition - 2: 1W-2W ( ) = 1V - 2V( )

(C) Dyn11:
Condition - 1: 1W–2W ( ) < 1W–2V ( )
Condition - 2: 1W–2W ( ) + 1U–2W ( ) = 1W – 1U ( )
Condition - 3: 1U - 2W ( ) = 2U–2V ( )
Note: For any other Vector Group Conditions of Testing, refer Manual.

Conclusion: The Vector Group is Cross - checked with Routine TC and found satisfactory (Y/N) :

MAGNETIC BALANNCE TEST FOR TRANSFORMER CORE:


Apply 415V to each winding and measure Voltages in the Other Winding

Applied Measured Condition 1U-N 1V-N 1W-N Condition for Magnetic Balance
1U-N 1V-N 1W-N 1 Apply - 1V 0.75V 0.25V
1V-N 1U-N 1W-N 2 0.5V Apply - 1V 0.5V
1W-N 1U-N 1V-N 3 0.25V 0.75V Apply - 1V
Conclusion: The Magnetic Balance is checked and found to be satisfactory (Y/N) :

MAGENTISING CURRENT (NO LOAD CURRENT) TEST :

SR NO VOLTAGE TAPPING APPLIED CURRENT NO LOAD LOSSES FREQU- REMARKS


(%) VOLTAGE VOLTAGE Measured Corrected ENCY
1 (1) The NL Losses & Magnetizing
2 currents are within Tolerance
limits (Y/N):
3
(2) The Results are compared
4 with TR Routine TC and found
satisfactory (Y/N):

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