Direct current feeding circuit

All live power conductors, except the earthed neutral, shall employ overcurrent protection selected as low as possible but adequate for the anticipated start-up currents. Control circuits conductors connected directly to supply voltages and circuits feeding control circuit transformers shall be protected. Refer to EN 60204-1 for more information. 

Using a direct methanol system may improve the energy density of the power supply and make fuel storage easier, though at the cost of increased complexity within the fuel cell. The open circuit of the DMFC decreases with the concentration of methanol feed to the anode owing to methanol crossover and leads to lower performance at low current density because of methanol oxidation at the cathode. However, at a high... 

Figure 31. Conversion (X) of C3H6 and NO in a ring-shaped Rh/YSZ cell at open-circuit (OC) condition and at three different potentiostatic polarization modes direct cathodic (DC -5V), direct anodic (DA +5V), and indirect bipolar (IB lOV). The obtained current is also indicated. Feed composition and temperature as in Figure 30, flow rate 200 mL min STP.

Figure 7.4. The anode and cathode bi-polar plates, the gas plenums, the membrane, and the gas diffusion layer. The Plenums are slowly replenished from an external feed. The black arrows indicate direction of electron flow and of proton counterflow. The external circuit between anode and cathode is completed through a load bank with variable resistance Rg. The voltage between anode and cathode plates is denoted by V and the external current by 7. ...

The power supplies to the FW pumps are utiliang static converter units which eliminate the large inrush currents at direct-on-line starting and therefore reduces the requirements on voltage stability (or rather short circuit strength) of the auxiliary power supply system busbars. Feedwater flow control is achieved by adjusting feed pump speed and the feedwater flow control valves. 

Short circuit flashovers caused during the course of live work are likely to result in serious injury for the simple reason that the worker is in close proximity to and probably directly facing the equipment that has been inadvertently short circuited. The extent of the flashover will depend on the amount of electrical energy available to flow into the fault. This will be determined by the fault level (the amount of current that the incoming electrical supply is capable of feeding into the fault) and the speed of operation of the electrical protection, e.g. a fuse or circuit breaker, to interrupt the flow of fault current. 

---