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Saitronix introduces Digital Notch Indicator Type SNI 135 EAZ(DC-DC) with DC-DC converter by
using the State of Art Technology to provide accurate Notch position indication for 25 KV AC
Electric Locomotives having N.32 Tap Changer. It is designed to withstand severe shocks and
vibrations encountered in loco service and special care has been taken in design to withstand
wide Voltage fluctuation (± 22.5%) in AC and DC mains supply to avoid damage to the equipment.
The Digital Notch Indicator is designed with time proven electronic hardware and programmed with specially designed software to display correct Notch numbers. It is also capable to identify, display, and record all faulty DJ trip and half Notch events with data retrieving facility from its memory. It is in fact works like black box for tap changer and the recorded data is very useful to loco maintenance personnel to diagnose tap changer to avoid loco failures.
The Digital Notch indicator can be functionally divided to two models.
Synchro Torque transmitter. - 1NO.
Digital Notch Repeaters. - 2NO.
The Synchro torque transmitter is a positioning device, when energized with its rated voltage – generates a set of theoretical electrical voltages corresponding to every physical position of its rotor.
The Digital Notch repeaters convert analog voltage signals from synchro transmitter into digital angles and process the data to display the notch numbers. The Digital Notch repeater is having the following four sub-modules.
Synchro to Digital conversion module.
Micro Controller module.
Display module.
Power Supply and protection module.
Synchro to Digital conversion module.
