EDZ: Electricité de Zahlé

EDZ installation methods for medium and low Voltage distribution basically follow the international standards and norms. At EDZ we emphasize on following procedures to limit energy losses and maintain a quality network, some of which are listed below:

Installation of surge voltage devices and overhead earth continuity conductors to reduce MV lines outages associated with bad weather conditions.
Utilization of the Remote Medium Voltage Lines Fault Indication system to quickly react to any fault condition.
Utilization of powerful GIS load flow calculations to assure a voltage drop of less than 4% at the furthest end of any LV network.
Utilization of Medium Voltage lines change over technique "bouclage" by installing MV switch gears in critical locations on the network so that any MV line under cutout could be recovered by another line following predetermined procedures.
Reduction of the over heating of connections by installing pressure type cable lugs.
Decrease of transformer burn outs by installing on every unit:
- Surges protection devices.
- Disconnection switches.
- Drop out fuses at the transformer primary side.
- Calibrated Thermal and Magnetic circuit breakers at the transformer secondary side with adequate breaking capacity.
Monitoring of all MV/LV distribution transformers output by sequentially installing a special apparatus called “Analyzer“ that records minute by minute distribution transformers information such as voltage, current, power factor, max. Volt, max. Amp etc… for later analysis.
Reduction of fraud by applying:
- Monthly calculation of technical energy losses value by using an advanced load flow technique developed on top of our GIS system.
- Around the clock surveillance of low voltage network.
- Consecutive on site inspection of meters by the use of a special portable apparatus “Etalon MTE “.
- Replacement of most LV overhead bare conductors with twisted and isolated type cables (Torsade).
- Reallocation of all energy meters by installing them at the customers’ residences entrances where they can be easily inspected.
- Issuing directions to our customers in order to restrain tampering and illegal hook ups to the grid and guiding them to efficiently use power supply.

In addition, One of EDZ main and most important tasks is the term maintenance schedule of all MV/LV networks and transformers distribution transformers.
During the years we were able to achieve fewer incidents of line faults and transformer burning outs by applying recurrent as well as yearly and quarterly scheduled maintenance activities.

Operation and Maintenance

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