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• Constant Current Charge - zinc is deposited on the graphite electrode and chlorine is evolved on a porous graphite electrode. This phase is 5 hours in length at 220 amps with a current density of 35.5mA/cm^. • Turnaround - starts decomposition of chlorine hydrate in the store to assure an adequate supply of chlorine during the initial stages of discharge. • Constant Current Discharge - current is maintained at 190 amps regard less of voltage fluctuations. e Variable Current Discharge - when voltage falls below 1.7 volts, current is stepped down incrementally. • Cleanout - remaining zinc is stripped from the electrodes via a resistor switched across the battery terminals. At the end of this timed phase, the system returns to the cooldown phase to begin a new cycle. 0 Standby - upon initial power up, the control system enters the STANDBY mode. In an idle state, battery cycling is not initiated until manually switched to another phase in the cycle, or entered after a failure has been detected. Data Display Data for display, printout, and control are read and stored in memory by the central processing unit of the computer. Status of battery parameters and calculated perfor mance data are displayed on the cathode-ray tube screen. Hardcopy printout of this information is available on the teletypewriter. By keying in the appropriate para meter description, a printout of displayed data can be obtained (Figure 25-6). Table 4-1 lists the battery data symbols displayed, their meaning and when they are printed. Failure Detection As the microprocessor control system is controlling the battery cycle, it recognizes symptoms of battery or auxiliary unit malfunctions. Data read by the computer is compared against preset system limits. If a limit is exceeded, an audible alarm sounds, a warning lamp is illuminated and an error message is displayed on the CRT screen. To prevent unnecessary shutdown due to transient conditions, no further action is taken by the controller for a short period of time. Subsequently, if data indicates that the faulty conditions still exist, then the controller terminates the test cycle by reverting to STANDBY, or other appropriate, predesignated course of action to prevent damage to the battery system. 25-7PDF Image | Development of the Zinc-Chlorine Battery for Utility
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