The aim of this work is to prove the feasibility of pulses through the use of a power transformer. This article presents the design and tests of a 500 J pulsed power transformer. This paper also describes the computer code created to simulate the primary quench development. During the tests, the primary winding was charged to its rated current (500 A). The secondary being connected to a 0.7 m/spl Omega/ and 0.2 /spl mu/H load, we obtained through this load a pulsed discharge of 7.2 ms duration. The current rose to 12.3 kA in 0.5 ms and 38% of the energy stored in the primary winding was transferred to the load. This current and energy transfer between primary and secondary is the best one ever recorded for such a device.