Browsing by Author "Muhammad Amin Majeed"

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    Real time monitoring of transformer by using WSN
    (University of Management and Technology, 2013) Haider Waqas; Muhammad Amin Majeed; Adil Sharif
    Power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults through the isolation of faulted parts from the rest of the electrical network. The objective of a protection scheme is to keep the power system stable by isolating only the components that are under fault, whilst leaving as much of the network as possible still in operation. Thus, protection schemes must apply a very pragmatic and pessimistic approach to clearing system faults. Transformers are a critical and expensive component of the power system. Due to the long lead time for repair of and replacement of transformers, a major goal of transformer protection is limiting the damage to a faulted transformer. Some protection functions, such as over excitation protection and temperature-based protection may aid this goal by identifying operating conditions that may cause transformer failure. The comprehensive transformer protection provided by multiple function protective relays is appropriate for critical transformers of all applications. The type of protection for the transformers varies depending on the application and the importance of the transformer. Transformers are protected primarily against faults and overloads. The type of protection used should minimize the time of disconnection for faults within the transformer and to reduce the risk of catastrophic failure to simplify eventual repair. Any extended operation of the transformer under abnormal condition such as faults or overloads compromises the life of the transformer, which means adequate protection should be provided for quicker isolation of the transformer under such conditions. In our project we integrated the PIC16F877A microprocessor/controller to the transformer. We install the program in to the microprocessorusing the special language which could be understood and compiled by the microcontroller. The microcontroller based circuit protects the transformerfrom : Overvoltage Over current Overheating Internal Faults The limits can be set into the microcontroller using the buttons given on the designed PCB for the faults described. Any abnormal condition sensed by the microcontroller immediately trips the relay and sounds the alarm on the circuit, in this way the abnormal condition can be rectified. The PCB has also the extra feature of controlling the voltage and the current manually using the variable resistors given. The variable resistors are provided both at input and output. In this project a real time monitoring through data logging scheme is designed and implemented on a Power Transformer. Since the monitoring of any machine ultimately leads to justify its healthy operation so knowledge of the parameters of the machine is very important. In this project we will monitor the transformer by monitoring its. We are sending our data through Xbee Transceiver. We are using two Xbee devises, one as a transmitter which is transmitting data from microcontroller and one as a receiver which is receiving data and then we serially communicate this data to the computer for real time monitoring. We have also used LCD to show all the constraints for the functions according to which the system works.