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This paper describes the specifications of newly developed compact isolation transformers for signaling networks such as telecommunication installations and information installations. These networks can use isolation transformers to mitigate surges occurring on services. It means that isolation transformers are used to eliminate the affect of noise and common mode voltage. Also the isolation transformers provide lightning protection for these networks. As the specifications of conventional isolation transformers are not sufficient, small-sized isolation transformers were developed. The new isolation transformers offer high isolation withstand voltage (50kV, 1.2/50μs) with low insertion loss (0.5dB) in the transmission frequency band of 500Hz to 30 MHz. The weight is only 0.3kg and the size is only 6×6×5cm. Key-Words: isolation transformer, isolation withstand voltage, low insertion loss Received: September 25, 2020. Revised: November 25, 2020, Accepted: December 2, 2020. Published: December 3, 2020.

Simple Closed Analytic Formulas for the Approximation of the Legendre Complete Elliptic Integrals K(k) and E(k) (and their First Derivatives)