transport of dangerous goods and risk management - Kirilo Savić

TRANSPORT OF DANGEROUS GOODS AND RISK MANAGEMENT 89Figure 6. Schematic of universal battery powered distribution boxThis part of the device facilitates the power supply of the coastal measuring telecommunication unit from differentpower sources:supply from network single-phase voltage of 220 V, 50 Hz, over the rectifier which produces directvoltages of 12V and 24 V. At the same time, this voltage is used for recharging batteries, as reserve powersupply. The switch behind the rectifier is used to select the voltage of 12V or 24 V, whereas it is placed inthe „0“ position when there is no network supply;supply from solar panel with the voltage of 12V or 24V, if there are no other power sources. A voltageregulator led from the solar panel is placed inside the distribution box. At the same time, this voltage is usedto recharge the battery;supply from gel battery, with the voltage of 12V or 24V and capacity of 15-40 Ah. The battery is used asreserve power supply , and with solar panels, it is used for charging the device during the night. Gel batterydoes not require any special maintenance and it does not cause any damaging vapours which could erodethe electric parts inside the box;supply over external source of 12V or 24V (if one exists) which is facilitated by the connection built in forthis type of power supply.Inside the distribution box there are diodes which are used to protect certain systems from destruction caused by thechanges in polarity of the supply voltage or emptying of the battery due to the short circuit in any part of the device.Coastal measuring telecommunication unitExternal and internal view of the coastal measuring telecommunication unit are shown on Figures 7 and 8.