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.
Citation:
Amarasinghe, D. (2013). Ukuwela-Polgolla remote telemetry system & forecasting water level of Polgolla Barrage [Master's theses, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.mrt.ac.lk/handle/123/13911