Quench propagation through manifolds in forced flow cooled coils

The hydraulic connections of the cooling channels of a forced-flow cooled coil can provide an effective means for propagating a quench in the winding pack by recirculating the hot helium expelled from the normal zone. This propagation mode can be exploited to decrease thermal gradients and increase the coil mass where energy is dumped during an accident. A model for the analysis of such a system is presented using a simplified approach for the hydraulic network formed by the manifolds and the distribution lines also including valves and pumps. The procedure has been coupled to a sophisticated quench analysis code. Results of simulations are presented to show that the manifold propagation of quench is of relevance and has beneficial effects in the case of switching or coil failures.<>