Specifications

PIP ELTFT01
Field Inspection and Testing of March 2001
New Electrical Equipment
Process Industry Practices Page 12 of 23
8.3. Testing Requirements
8.3.1 All power transformer tests shall be per NETA ATS.
8.3.2 Oil samples from the transformer shall be obtained and tested for the
following:
1. Dielectric breakdown voltage
2. Neutralization number
3. Specific gravity
4. Interfacial tension
5. Color
6. Power factor
7. Water content
8.3.3 Perform a gas chromatograph test on each transformer to establish initial
base points.
8.3.4 Test insulation resistance of transformer windings by disconnecting surge
arresters and using a 10-minute dielectric absorption test. Windings shall be
tested primary to ground, secondary to ground, and primary to secondary.
8.3.5 Test each transformer using AC power factor test in accordance with test
equipment manufacturer’s instructions.
8.3.6 Test ground resistance of transformer grounding point using the fall of
potential method.
8.3.7 When specified on the Data Sheet, test each transformer using transformer
turns ratio (TTR) test at each no-load tap setting.
8.4 Function Test Items
8.4.1 Function-test operation of all safety interlock systems.
8.4.2 Function-test operation of auxiliary devices or systems:
1. Liquid temperature, level, pressure alarms, etc.
2. Fault pressure relay alarm or shutdown
3. Cooling fans
4. If provided, terminal compartment space heaters
8.4.3 Set transformer taps to give desired secondary voltage according to the
design primary voltage for normal operating condition.
9. Shielded Power Cables
9.1 Equipment and Installation Check Items
9.1.1 Check cable size, type, and rating.