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Electric Locomotive

Prominent & Leading Manufacturer from Hyderabad, we offer Speed Recorder MRT 922, Speed Recorder MRT 921, Auxiliary Converter, Test Bench, Control & Fault Diagnostic System and Electric Locomotive Speed Recorder.

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Speed Recorder MRT 922

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MRT 922 Recorder is Speed cum Energy monitoring system for both conventional and three phase locomotives. Except some of the features and specifications rest are same as MRT921.

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Speed Recorder MRT 921

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Used on AC Locomotives, Electric Multiple Units and DC Electric Multiple Units for Speed Indication, Recording and Energy Monitoring.

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Auxiliary Converter

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Single Phase to Three Phase 180KVA Static Converter will take Single Phase Supply from the Locomotive main transformer tertiary winding and will use a Rectifier to derive a stable DC link voltage and unity power factor at input stage. The DC Link is unaffected by supply voltage variations. This DC link will be used as input to the three - phase Inverter, which will utilise IGBTs to synthesise a three-phase Sine Weighted PWM waveforms, with a fundamental voltage of 415 Vrms line to line. Since IGBTs are used as switching devices in the inverter, the system reacts fast to any of the fault conditions and protects itself and loads from all fault conditions. A Battery Charger is also built-in to cater to DC loads and to Charge the battery.

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Test Bench

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TB-03 is a system ideally suited for Test Rooms in Loco Sheds for testing of Recorder cum Indicator, additional Indicator type MRT-912, Pulse generator type T-812 and Optical Speed Sensors type T-813 and T-813M. It can also be used for testing Memory type Speed cum Energy Recorders and Indicators type MRT 921 and MRT 922. It work on 230 VAC, 50 Hz power supply. Complete set of Recorder cum Indicator, additional Indicator and Pulse Generator/ Speed Sensor can be tested in a totally simulated environment using the Pulse Generator/Speed Sensor Test Simulator.
Recorder cum Indicator and Speed Indicator can also be tested and calibrated for Speed accuracy by using computer controlled accurate Speed Simulator Type SS-03. Accuracy of Energy calibration for MRT 921 and MRT 922 is verified by checking the accuracy of OHE voltage and OHE current measurement.

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This system is designed for Propulsion Control of Tap Changer type electric locomotives of WAG, WAM and WAP series of Indian Railways. It eliminates the intermediate relay control logic of the locomotive with a micro controller based system thus enhancing the availability by eliminating Intermediates relays, their interlocking and associated wiring.

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Medha is one of the leading manufacturers of Speed Recorders for Railway applications. These recorders are used on Locomotives and are similar in function to Black boxes in aeroplanes. Speed Recorders are used for monitoring the performance of Loco Driver and especially in the event of an accident the recorded data becomes vital for establishing the cause of accident.
Medha designed it's first Speed Time Distance Recorder MRT 912 in 1989. It was an innovative technology in Strip Chart Recording using a microprocessor, developed as a substitute for the Secheron, Switzerland made mechanical Speed Recorder used by the Indian Railways at that time. It was the first microprocessor based system on the Indian Locomotives.

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