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Measuring Transformer Distributed Capacitance
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From Datatronics™
This article is a general discussion of distributed capacitance, Cd, in transformers with emphasis on measurement. We will discuss how capacitance occurs, references to formula for calculating, how capacitance is modeled, how Cd is measured (with three cautionary notes) and guidelines to aid in evaluating / measuring Cd. Capacitance in a transformer winding cannot be avoided. The voltage difference between turns, between winding layers and between windings to core create these parasitic elements. In general, part of the designers' task is to keep capacitance to a minimum. On rare occasions winding capacitance is increased to reduce ringing in switching transformers. Products & Services
Instrument transformers are used to step-down current or voltage to measurable values. They provide standardized, useable levels of current or voltage in a variety of power monitoring and measurement applications.
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Current sense transformers are used to detect and measure current. There are two basic types of products: switch-mode transformers for power conversion applications, and precision-measurement transformers for instrumentation applications.
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Gate drive transformers are used to drive high-speed switching devices such as field effect transistors (FET) and insulated gate bipolar transistors (IGBT). They are used in applications such as switching power supplies.
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Signal transformers transfer information from one circuit to another by electromagnetic induction. They are used to increase or decrease the voltage from one side of a power transformer to the other.
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Switch mode transformers (switching transformers) are used mainly in switching power supplies and DC-DC converters. They provide a storage element for transferring energy from input to output in discrete packets as required in switching power supplies, regulators and converters.
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