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- Types and Uses - Identify the types, classification, and application of transformers and electrical circuits. Understand the differences between dry-type, cast-coil, and liquid-filled transformers. Understand the application of power substation, distribution, instrument, and control transformers. Recognize that power circuit breakers and transformers are generally equipped with instrument transformers.
- Power/Distribution Transformers
- Types and Construction of Power and Distribution Transformers Transformers can be divided into two general categories according to their insulating medium and construction: liquid filled and dry type. Each has several variations and each requires different maintenance techniques.
- Understanding Transformer Cooling Systems and Methods Cooling classes of dry type transformers are covered by ANSI/IEEE standard C57.12.01.
- The Basics of Large Dry-Type Transformers The key difference in the design of dry-type, cast-coil, and liquid-filled is in the insulation of the windings.
- The Basics of Transformer Tap changers The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. There are two types of transformer tap changers: an on-load tap changer (OLTC) and a deenergised tap changer (DETC). Note that not all transformers have tap changers.
- Glossary of Transformer Terms Quick reference of important transformer terms and acronyms.
- Instrument Transformers
- Instrument transformers The most common usage of instrument transformers is to operate instruments or metering from high voltage or high current circuits, safely isolating secondary control circuitry from the high voltages or currents.
- Instrument Transformer Basic Technical Information and Application Instrument transformers are designed specifically for use with electrical equipment falling into the broad category of devices commonly called instruments such as voltmeters, ammeters, wattmeters, watt-hour meters, protection relays, etc.
- Current Transformer Basics: Understanding Ratio, Polarity, and Class The principal function of a current transformer is to produce a manageable level of voltage and current, proportional to the current flowing through its primary winding, for the operation of measuring of protective devices.
- Power/Distribution Transformers
�Getting Started