Voltage&Frequency protection device

Code : DV-72-03C

The device measures the True RMS value of the voltage and frequency in tri-phase systems accurately. It is possible to observe the voltage value in the upper screen and the frequency value in the buttom screen simultaneously. Using the buttons, phase – nuetral and phase – phase voltages can be observed as shown in the figure in the right side. The device contains many protections as followes: ■ Phase failure. ■ Phase sequence. ■ Over Voltage protection. ■ Under voltage protection: ■ Unbalanced voltage protection. ■ Over frequency protection. ■ Under frequency protection. As the device is beeing installed it closes its output contact if the voltage and frequency values are within the adjusted ranges and phase sequence is correct. In case of any previous mentioned faults (except of phase failure where openning is sudden) the the device opens its output contact at the end of delay adjusted by user. When the values return withiin the adjusted ranges the device closes its output contacts at the end of an adjusted delay. Note: L1-N is the device's power supply inputs. Thus, the applied voltage must be the rated voltage of the system. The measured frequency also must the frequency of the system.