UFC 3 -520-01
June 10, 2002
4-7
INFORMATION SOURCES. The ANSI and IEEE C57 standards provide the
best source of transformer design and application guidance. The most appropriate
design guidance varies with transformer design, voltage, kVA rating, and connection.
For this reason, numerous standards are available as design references. Review the
following ANSI and IEEE standards, as well as other documents listed below, as
appropriate for any transformer application:
4-7.1
C57.12.10, Safety Requirements 230 kV and Below 833/958 Through
8333/10417 kVA, Single-Phase, and 750/862 Through 60,000/80,000/100,000 kVA,
Three-Phase Without Load Tap Changing; and 3750/4687 Through
60,000/80,000/100,000 kVA with Load Tap Changing--provides the basis for
performance, interchangeability, and safety of transformers, and includes information
useful for proper selection.
4-7.2
C57.12.22, Requirements for Pad-Mounted, Compartmental-Type, Self-
Cooled, Three-Phase Distribution Transformers With High-Voltage Bushing, 2500 kVA
and Smaller: High-Voltage, 34500 GrdY/19920 Volts and Below; Low Voltage, 480
Volts and Below covers electrical, dimensional, and mechanical characteristics,
--
including safety features, of distribution transformers.
4-7.3
C57.12.23, Standard for Transformers--Underground-Type, Self-Cooled,
Single -Phase Distribution Transformers With Separable, Insulated, High-Voltage
Connectors; High Voltage (24940 GrdY/14400 V and Below) and Low Voltage (240/120
V, 167 kVA and Smaller)--covers electrical, dimensional, and mec hanical
characteristics, including safety features, of distribution transformers used in
underground transformers.
4-7.4
C57.12.25, Requirements for Pad-Mounted, Compartmental-Type, Self-
Cooled, Single-Phase Distribution Transformers with Separable Insulated High-Voltage
Connectors: High Voltage, 34500 GrdY/19920 Volts and Below; Low Voltage, 240/120
-
Volts; 167 kVA and Smaller--covers electrical, dimensional, and mechanical
characteristics, including safety features, of distribution transformers.
4-7.5
C57.12.26, Standard for Transformers--Pad-Mounted, Compartmental-Type,
Self-Cooled, Three-Phase Distribution Transformers for Use With Separable, Insulated,
High-Voltage Connectors; High Voltage, 34500 GrdY/19920 V and Below; 2500 kVA
and Smaller--covers electrical, dimensional, and mechanical characteristics, including
safety features, of compartmental type distribution transformers.
4-7.6
C57.12.50, Requirements for Ventilated Dry-Type Distribution Transformers,
1 to 500 kVA, Single-Phase, and 15 to 500 kVA, Three-Phase, with High-Voltage 601 to
34500 Volts, Low Voltage 120 to 600 Volts--covers electrical, dimensional, and
mechanical characteristics, including safety features, of dry type distribution
transformers.
4-13
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