Attachment 3 Transformer Oil Tests Table Am-0006.pdf
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This document is a detailed technical specification table for Transformer Insulating Oil Test Requirements. The table outlines comprehensive testing standards for transformer insulating oil across multiple voltage ranges (≥ 69 & < 230 kV and ≥ 230 kV), specifying exact parameters for physical, electrical, and chemical tests. Key testing standards include ASTM methods for measuring characteristics such as color, flash point, interfacial tension, dielectric breakdown voltage, oxidation stability, water content, and PCB content. The table provides testing requirements for new oil certification, delivery samples, and post-filling/commissioning samples, with precise acceptable ranges for each measured parameter to ensure the quality and performance of transformer insulating oil.
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≥ 69 & < 230 kV ≥ 230 kV
Analine Point ASTM D611 ≥ 63 °C
Color ASTM D1500 ≤ 0.5 ≤ 0.5 ≤ 1.0 ≤ 0.5
Flash point ASTM D924 ≥ 145 °C ≥ 145 °C
Interfacial tension ASTM D971 ≥ 40 mN/m ≥ 40 mN/m ≥ 38 mN/m ≥ 38 mN/m
Pour point ASTM D97 ≤ -40 °C
Specific gravity ASTM D1298 ≤ 0.91 (at 15 °C) ≤ 0.91 (at 15 °C)
Viscosity ASTM D445 ≤ 3.0 mm
/s (at 100 °C)
≤ 12.0 mm2/s (at 40 °C)
≤ 76.0 mm2/s (at 0 °C)
Visual examination ASTM D1524 Bright and clear Bright and clear Bright and clear Bright and clear
Dielectric breakdown voltage ASTM D1816 ≥ 20 kV (1 mm gap)
≥ 35 kV (2 mm gap)
≥ 20 kV (1 mm gap)
≥ 35 kV (2 mm gap)
≥ 30 kV (1 mm gap)
≥ 55 kV (2 mm gap)
≥ 35 kV (1 mm gap)
≥ 60 kV (2 mm gap)
Gassing tendency ASTM D2300 ≤ 30 µL/min
Dissipation factor ASTM D924 ≤ 0.05% (at 25 °C)
≤ 0.30% (at 100 °C)
≤ 0.05% (at 25 °C)
≤ 0.30% (at 100 °C)
≤ 0.05% (at 25 °C)
≤ 0.40% (at 100 °C)
≤ 0.05% (at 25 °C)
≤ 0.30% (at 100 °C)
Oxidation stability, 72 hour ASTM D2440 ≤ 0.1 % (sludge mass)
≤ 0.3 mg KOH/g (acid)
Oxidation stability, 164 hour ASTM D2440 ≤ 0.2 % (sludge mass)
≤ 0.4 mg KOH/g (acid)
Oxidation stability by pressure vessel ASTM D2112 ≥ 195 minutes
Oxidation inhibitor ASTM D2668 ≤ 0.30 % Between 0.25 - 0.30 % Between 0.25 - 0.30 %
(Post-filling only)
Between 0.25 - 0.30 %
(Post-filling only)
Corrosive sulfur ASTM D1275 Noncorrosive Noncorrosive
Water content ASTM D1533 ≤ 35 ppm ≤ 35 ppm ≤ 10 ppm ≤ 10 ppm
Neutralization number ASTM D974 ≤ 0.03 mg KOH/g ≤ 0.03 mg KOH/g ≤ 0.03 mg KOH/g ≤ 0.03 mg KOH/g
Furanic compounds ASTM D5837 ≤ 25 µg/L ≤ 25 µg/L Used as baseline Used as baseline
PCB content ASTM D4059 Not detectable Not detectable
Dissolved gas-in-oil analysis ASTM D3612 Used as baseline Used as baseline
Dissolved metal-in-oil analysis
(For forced-oil cooled trans. ) ASTM D7151 Used as baseline Used as baseline
TABLE 1 - TRANSFORMER INSULATING OIL TEST REQUIREMENTS
POST-FILLING SAMPLES & COMMISSIONING SAMPLES
PHYSICAL TESTS
ELECTRICAL TESTS
CHEMICAL TESTS
OIL TEST STANDARD
NEW OIL CERTIFICATION
(AS DELIVERED)
DELIVERY SAMPLE
(TAKEN FROM EACH TANKER)
File details come from the government source that posted it. Updated .