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Specialists in Testing Diagnostic for the Electrical Power Industry

MAINTENANCE THROUGH TRANSFORMER OIL ANALYSIS

 CASE STUDIES

 ALUMINIUM SMELTER

Practical Experience Gained from Dissolved Gas Analysis at an Aluminium Smelter click here to download

Practical Experience Gained from Dissolved Gas Analysis at an Aluminium Smelter--Eurotehcon 2011. Click here to download.
Practical Experience Gained from Dissolved Gas Analysis at an Aluminium Smelter--Eurotehcon 2011-presentation.
Click here to download.

 BHP BILLITON

bhb biliton smelter02

 

BHP BILLITON
HILLSIDE ALUMINIUM SMELTER
RATING: 1075 Kvar VOLTAGE: 22 kV
 

ANALYSIS/DIAGNOSIS
THERMAL FAULT OF OF HIGH
TEMPERATURE RANGE>700
Deg C
(IEC 599: GAS PRODUCTION
RATES-Ethylene(C2H4)-Significant
CONDITION 4
FINDINGS: Burning on the Resistor
CAUSES: Fourth Harmonic being amplified causing the transformer to be subjected to 10 times its rated current(milli seconds) i.e Design Fault System

SAVINGS IN THE MILLION RANGE or in the Billion Range due the knock on effect
 

 

 SAPREF PETROLEUM REFINERY

SAPREF PETROLEUM REFINERY
Voltage: 6.6 kV Rating: 1250 KVA
Diagnosis: Partial Discharge(Corona)
Condition Code 4
Findings
The core of the transformer was found to be delaminating due to corrosion caused by high humidity( 73ppmwater in oil)
Savings: R Hundred Thousand range possible R Million range if the Transformer failed with Fire 

Sapref1

Sapref2

Sapref3

 UMGENI WATER

 

UMGENI WATER
6.6 kV 1000 KVA
Voltage: 11/6.6 kV Rating 5000 KVA
Analysis/Diagnosis: Condition Code 4y

The DGA indicated a Thermal Fault 300-700 Deg C
Findings:Various Copper to Aluminium(bi-metal) connectionís were found burned Savings:The transformer was repaired at the Manufacturer cost, i.e First year warrant

umgeniwater

 

 NORDBERG SMELTER

nordbergsmelter

 

NORDBERG SMELTER
FURNACE 10 TON Voltage: 11 kV/5250v Rating: 3000 KVA
The DGA analysis indicated a Discharge of High Energy(Arcing)
Condition Code 4
Note: The Electrical tests-Meghom Meter(Insulation Resistance) passed
Caution: In the event of a unit trip conduct a DGA before Re-energising
 

 

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