Ukuwela-Polgolla remote telemetry system & forecasting water level of Polgolla Barrage

Abstract

In this project, a wireless telemetry system was designed and implemented to monitor the water level information of Polgolla barrage from the control room of Ukuwela power station. Using the water level variation, a mathematical algorithm was developed to predict the time to reach minimum / maximum water levels. The wireless telemetry system consists ofthree sub systems. They are I. Data transmitting unit located at Polgolla dam: The water levels are digitized by “Analog Input Modules” and fed the the Telemetry Module. The gate Open / Close status are directly fed to the Telemetry Module serialize these information and send the Data Radio. The Data Radio modulates these information and transmit in to the air. II. The Repeater Station located at Dunuwila: Receives this information and re transit after five seconds. (Store & Forward Repeater) III. Data receiving unit located at Ukuwela Power Station: The information received by Data Radio are sent to the Telemetry Module. It de-multiplexes the information and a) Updates Analog Output modules so that these output modules can re-construct original water level information. b) Outputs gate open / close status through relay contacts. The mathematical algorithm uses two sets of input data. I. Water volume, V(h) vs water level, h ; This is available as a table. II. Water level, h(t); This is given by the above mentioned telemetry system. This model can be run on a personal computer and can be used to estimate the time taken to reach maximum and minimum water level and raise alarms.