ABSTRACT

Stephy Beatrix Walukow, A Three-phase kiloWatt-hour-(kWh)-meter Security Control System (supervised by Rhiza S. Sadjad and Zahir Zainuddin)

This is a design project to develop a security control system to prevent losses at a customer's three-phase kWh-meter of the state-owned electrical power company. 

There are very well known cases that some electrical power customers cheat their electricity bills by intentionally disconnecting one of the three-phase lines in order to slow down the rotational speed of their kWh-meter's discs. As reported in this thesis, for the case of 220 Volt, 2.5 Ampere, cos f = 1, the disconnected line can reduce the reading of the kWh-meter up to ….... % of the actual electrical power supplied to a customer.

A micro controller-based security control system is proposed in this research project to cut off automatically the electricity supply whenever one of the three-phase lines is disconnected, either intentionally or unintentionally. The time-response of this system is specified to be varied ranging from …... seconds to …... seconds. 

The system has been tested for a low-voltage (220 Volt per-phase)  three-phase kWh-meter and kVAR-meter, but can be implemented for the higher voltage utility systems as well. By implementing this security control system, the electrical power company can prevent losses valued up to Rp. …............/month per customer due to the customer's misbehavior of disconnecting one of the three-phase lines.