8
High Voltage Instrument Transformers | CA/UT/KA
User Manual
TESTS PROGRAM/
When What
On arrival of the transformers at the warehouse or substation A1
After unpacking A2 - A3 - A4 - A6 - C2
During assembly A2 - A3 - A4 – A5 - A6 - B1 - B2 - B3 - B4 - B5 - B6 - C1 - C2 - D2 - D3
After energizing A7 - B7 - C1 - C2 - F1
Routine checks (weekly or monthly) A2 - A7 - B7 - C1 - C2
Annual check A2 - A3 - A4 - A5 - A6 - A7 - B1 - B2 - B3 - B4 - B5 - B6 - B7 - C1 - C2 - F1
Every fi ve years Same as annual + D1
After re-connections, load changes A7 - B1 - B2 - B3 - B4 - B5 - B6 - B7 - F1
After the fault conditions, the short circuits, etc.
A3 - A7 - B1 - B2 - B3 - B4 - B5 - B6 - B7 - C1 - C2 - D1
See also “Careful check of the transformer” below
After 1 year from start-up and after 5 years from start-up, if the
values are normal and there is no considerable increase, perform
an analysis after 15 years from start-up, and then every 5 years
E1 - E2 - E3 - E4
CAREFUL CHECK OF THE TRANSFORMER/
It is recommended that all regular tests be repeated after a
long period of operation (about 20 years), or if a major network
disturbance has occurred that could damage the transformer
(e.g. a short circuit with current or duration values higher
than the nominal ones, or over-voltages caused by the
malfunctioning of the switches).
QUICK TROUBLESHOOTING GUIDE
Phenomenon Cause Countermeasure
Oil stains
Oil residues from the
manufacturing process
Clean the area and keep it under
observation for 24 hours. If the stain does
not reappear, the device can function
normally. If the leak persists, contact
Arteche
Loose junctions
Tighten the screws and bolts, clean the
area and keep it under observation. If the
leak persists, contact Arteche
Cracks or damage to components Contact Arteche
Oil level indicator not visible
Level indicator is stuck
Remove top cover and eliminate
mechanism blockage
Leakage or overpressure
Remove service transformer and contact
Arteche
Cracks in resin parts Bumps or improper handling
Contact Arteche
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