Test Circuit Clausole campione

Test Circuit. A test circuit for operating the Hybrid CB prototype has been set up at the Consorzio RFX laboratory. A simplified scheme is shown in Figure 4.2, a picture of the test circuit is shown in. A current up to 10 kA is supplied by a thyristor converter rated for 16 kA and 1.5 kV, normally used for supplying the toroidal circuit of RFX, into the series connection of a resistor (R = 0.1 Ω), an inductance (L = 1.5 mH) and the Hybrid CB prototype. A discharge resistor of 75 mΩ, simulating the QPC dump resistor, provides the commutation path for the current after the Hybrid CB opening. A making switch is connected in parallel to the Hybrid CB, in order to provide a low impedance path for the current in case of mis-operation of the Hybrid CB. This making switch is composed of a static crowbar connected in parallel to a mechanical switch. The static crowbar, consisting in two paralleled Gate Turn Off Thyristors (GTO) 211QS26923B, allows for a very rapid intervention of the making switch (in the order of micro seconds) but with limited I2t capacity, while the mechanical switch has slow intervention time (in the order of 30 ms) but higher I2t capacity.