of power loss incidents cause enormous damage to computers and data in the field, communication and data centers, facilities that are well equipped to provide uninterrupted power. Failures in sensitive places, even if related to the malfunctioning of the harsh and stormy season grill, occur mainly due to processing errors, standby generator starting problems, malfunctions of cables and other victims of poor maintenance that can be avoided.
excessive summer heat overloads electricity supply due to tremendous growth in air conditioning systems, causing power cuts due to load shedding or intervention of overload switches.
Normally, during the dry period, contamination which includes electrically conductive materials are collected on power line insulators. First rains and storms close the electric path causing shorts and arcs, tripping line breakers. Sometimes poles catch fire due to arcing.
The salt is used in some areas as part of winter road treatment, increasing the amount of diffuse contamination from road vehicles by raising the salt from the roadway. This creates more potential for electric arcs near freeways and major roads.
The trees are also a major cause of power outages in the winter. Winds and snow cause trees to fall. The falling trees cut power lines. Some power lines create electric shorts and arcs between adjacent power lines or from power lines to the ground.
Until the late eighties, year by year, the arrival of the first autumn storm or interruptions of the current summer was accompanied by collapsing of defective UPS systems (UPS) and particularly worn out backup batteries. No UPS Company had enough staff, or enough batteries to deal with all irate calls from customers. The chaos stopped when microprocessor based UPS control was introduced in the early nineties, which allows automatic testing of UPS systems including batteries, by performing periodic power outage simulation exercises. The exercise allowed detection of defective systems, correction of the UPS and replacement of defective and weak batteries. All these preventive actions were performed when mains power was still available, before the storm season.
Recent studies indicate that plants equipped with Uninterruptible Power Supply systems, fail normally. In most cases the power failure occurred after depletion of UPS batteries.
Similarly to the described initial experience with UPS systems, the majority of power plants studied, which failed during the harsh seasons turned out to be already defective, and they do not perform within its limits designed. Lightning and switching voltages generated in the grid are generally attenuated and fixed to the insulation levels of line isolators and surge protective devices. transformers and healthy cables should be able to withstand these voltage levels, and backup generators should start when needed.
Perform proper preventive maintenance can solve the main problems of breakage. Simple, convenient monitors based on technologies such partial discharges (PD) and the infrared tomography are able to detect the defects of transformation, and enable the planning of corrective actions in time. business interruption simulation can reveal the power of the generator start-up problems. PD methods, Power Factor measurements, as well as other monitoring methods, offered by test instruments manufacturers, can alarm before the beginning of the storm season of defective underground cables, which require treatment.
Thus, studies of power interruption indicate that most of the accidents are due to defective equipment, which fails in difficult environment. Such outages, do not happen due to acts of God but due to negligence of humans, and can be avoided. Proper maintenance of the prevention service, regular periodic maintenance schedule, exercising and monitoring can foresee possible problems that can be solved before the storm come.
0 Komentar