Most of the failures of induction motors become insulation faults, causing a permanent damage. Using differential current\r\ntransformers, a system capable of insulation fault detection was developed, based on the differential relay protection scheme. Both\r\nsignal injection and fault detection circuitry were integrated in a single chip. The proposed scheme is faster than other existing\r\nprotection and not restricted to protect induction motors, but several other devices (such as IGBTs) and systems. This paper\r\nexplains the principle of operation of fault protection scheme and analyzes an integrated implementation through simulations\r\nand experimental results. A power-integrated circuit (PIC) implementation is presented.
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