Frankfurt (Germany), 6-9 June 2011 EL-HADIDY – EG – S5 – 0690 Mohamed EL-HADIDY Dalal HELMI Egyptian Electricity Transmission Company Egypt EXAMPLES OF.

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Presentation transcript:

Frankfurt (Germany), 6-9 June 2011 EL-HADIDY – EG – S5 – 0690 Mohamed EL-HADIDY Dalal HELMI Egyptian Electricity Transmission Company Egypt EXAMPLES OF CONDITION BASED MAINTENANCE IN DISTRIBUTION SYSTEMS

Frankfurt (Germany), 6-9 June 2011 INTRODUCTION  Unnecessary maintenance can be a cause of failures by itself.  Both failures and traditional maintenance will normally result in a disconnection of a part of the power system and by this reduce the availability.

Frankfurt (Germany), 6-9 June 2011  The unavailability of the component can be simplified as: MTTR/MTBF + MTTM/MTBM where, - MTBF = Mean Time Between Failure - MTTR = Mean Time To Repair - MTBM = Mean Time Between Maintenance - MTTM = Mean Time To Maintain

Frankfurt (Germany), 6-9 June 2011  Recent surveys of maintenance management effectiveness indicate that one-third of all maintenance costs is wasted as the result of unnecessary or improperly carried out maintenance.  The dominant reason: the lack of factual data to quantify the actual need for repair or maintenance Maintenance scheduling has been, and in many instances still is, predicated on statistical trend data or on the actual failure of plant equipment.

Frankfurt (Germany), 6-9 June 2011  The challenge is to convert raw data to useful info. for Asset Management and Operation.  This includes an efficient communication and data management  The major task is still to analyse the data and present useful information for different users.  This can be done manually or automatically.

Frankfurt (Germany), 6-9 June 2011 Predictive Maintenance has many advantages: increasing component operational life/availability, allowing for on-time corrective actions, decreasing equipment or process downtime, decreasing costs for parts and labor, improving worker and environmental safety, improving worker morale, substantial savings over preventive maintenance eliminating most unexpected down events, providing information to perform a root cause analysis a decreasing of spare parts inventory.

Frankfurt (Germany), 6-9 June 2011  Disturbance Recorders can play vital role in the maintenance management. They are scattered and permanently connected throughout the power system.  Some goals of using these recorders was traditionally as follows: Determining the performance of system components Analysis of the nature and cause of a disturbance. Identifying equipment misoperations Analysis and correction of protection system and control deficiencies Reducing the risk of recurring misoperations

Frankfurt (Germany), 6-9 June 2011  Two main requirements have to be fulfilled in order to fully run the required analysis: Additional Software capable of handling the captured data for identifying the incorrect performance of the specified equipment. Accumulated expertise capable of reading the hidden information given by these data and analysis software outcomes.

Frankfurt (Germany), 6-9 June 2011 Example 1: Circuit Breaker Restriking

Frankfurt (Germany), 6-9 June 2011  From the fault described above, it can clearly be seen that an in-depth fault analysis, making use of records coming from DFR’s, can be a basic input for maintenance and so improve the overall reliability of the network.

Frankfurt (Germany), 6-9 June 2011 Example 2:Insulation Maintenance- Intermittent Fault

Frankfurt (Germany), 6-9 June 2011  This case study proves the capabilities of Disturbance Recorders as a maintenance tool since it gives early detection before serious consequences occur due to insulation deterioration.

Frankfurt (Germany), 6-9 June 2011 Example 3: Fault Location  Fault location has two issues: The first is an operating issue: the system should be isolated to prevent further occurrences of faults. The other is a maintenance issue: what equipment needs checking or repairing in order to return it to service as soon as possible.

Frankfurt (Germany), 6-9 June 2011

 high accuracy (an error of only one span)  Such accuracy in fault location saves maintenance time and money which leads to improve the reliability of the system by reducing the outage time.

Frankfurt (Germany), 6-9 June 2011 OTHER FIELDS OF APPLICATIONS some other fields of applications that DMS can add a value in the predictive maintenance operation of the transformers: Monitoring of the transformer on-load tap changer's motor current Correlate Dissolved Gas Analysis (DGA) with fault information (fault energy) can avoid transformer failure by scheduling proper predictive maintenance. ……. And much more

Frankfurt (Germany), 6-9 June 2011 CONCLUSIONS  Today, the electric power industry's long- term vision comes to end the traditional periodic maintenance, and three things are contributing to breakup: The expansion of condition monitoring The need to cut costs, and The desire to get the most out of existing equipment

Frankfurt (Germany), 6-9 June 2011  The advanced monitoring, recording and analysis gives the user, electric utility, valuable tools for improving the efficiency, reliability, and reducing the cost of maintenance in electric power system.  Another important factor for improving the reliability and reducing the cost is the predictive capability of such equipment, which gives early alarming for a problem to be solved correctively before serious consequences.

Frankfurt (Germany), 6-9 June 2011 Working Closely with Power system Experts is a must Condition Identification=Data/Information+ Expert

Frankfurt (Germany), 6-9 June 2011 Thank YOU