Monoblock Testing
  Monoblock Oil Leakage Sample Test
Each cast resin bushing assembly selected for sample testing shall be subjected to an oil leakage test, the oil complying with the requirements of BS 148 being maintained for 6 hours at 75°C at a pressure of 1 bar on the transformer side of the assembly with the other side exposed to atmosphere.
At the conclusion of this test, no leakage or oil ingress into normally oil-free spaces shall have occurred.
Sample tests shall be carried out on at least one assembly from each batch, or 2% of all units manufactured in each batch, whichever is the greater.
Monoblock Air Leakage Routine Test
Each cast resin bushing assembly shall be subjected to an air leakage test for 1 hour at a pressure of 1 bar on the transformer side of the assembly with the other side exposed to atmosphere. At the conclusion of this test no leakage of air shall have occurred.
4 Way CT Terminal Block Test
The terminal block shall be air pressure leak tested at 1 bar for 15 minutes, where there should be no signs of air leakage.
Parts are identified with a unique identification serial number with full traceability to materials used and date of manufacture.
|
