Erling Hesla

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An electrical distribution architecture has a vital impact on the performance of an installed system throughout its lifecycle. The architecture of an installation involves the configuration, the choice of power sources (utility and alternate power source), the definition of the different distribution levels, and the choice of equipment. Previous papers have(More)
Maintenance personnel must take the clearing procedures, operating the necessary steps to assure that the system or portion of the system on which they plan to work is in an electrically safe working condition. The complexity of the electrical system normally determines the level of detail planning required for system clearing procedures. The clearing(More)
The design of a power system has to be comprehensive in regard to the system traditional design configuration aspect as well as its operational safety aspect, such as management and maintenance. The comprehensive design has to survey and define both aspects during the different design phases and during the overall operational life cycle of the system. A new(More)
In electrical installations, each working zone and each source node present a kit of operating instructions as a logic gene. Previous papers have introduced a new approach and a language of a ternary code for operational procedures (Parise program). This paper deals with some comments on definitions and the syntax of the operational language. The same(More)
In the operation of electrical installations, risk assessment evaluates hazards and conflicts. A kinematics analogy for analyzing the risk of “collisions” offers a new approach for operational procedures and allows the introduction of a “transition” theory for intersections. The architecture of electrical installations can be(More)
"Lockout" and "tagout" procedures to ensure safety is universally accepted. In order to perform operations of electrical maintenance on a zone, portion or components of the system, it is necessary to use more elaborate clearing procedures and written switching instructions for systems, together with a single-line diagram. Past practice has been largely(More)
The aim of this paper is to present shortly syntax and semantics of a language to program operational procedures. This formal language is a unified suite of symbols, meanings, and codes used on the basis of conventional rules. Symbols have to be related to meanings and to be shared: operational, mathematical, and graphical symbols shown are preferred but(More)
In general, power software lacks lockout/tagout (LOTO) procedures and transfer/switching procedures-both critical shortcomings. In 2008, this Working Group (WG) was created to develop methodology for software programs addressing operational procedures, switching procedures including LOTO, and transfer procedures. The “User Guideline(More)
The architecture of a mission critical power system has to be designed with structures that allow the simultaneous operation of multiple sources (architecture efficiency). Opportunely organized, the business continuity management will project its program and take actions on the sources. Complete control of the system is necessary for all operating(More)
A utility interruption at a small data center resulted in failure of all computer racks despite power redundancy. The electrical forensic engineer investigated numerous accounts of the failure event, including interviews with data center personnel and data logs from the generator and uninterruptible power system. Initial conclusions from these accounts led(More)