Mar 22, 2017 ieee approves new standards project ieee p2755 tm guide to terms and concepts in intelligent process automation. Software reliability is defined as the probability of failurefree operation for a specified period of time in a specified environment iso9126. Ieee 1 a collection of the names of all data items used in a software system, together with relevant properties of those items. In addition, all factory or subvendor upgrades to software shall be added to the systems, when they become available, at no additional cost. Software requirements for complex systems 3 the maintenance personnel feel that the current program is difficult to change.
Its ideal for harsh environments where submergibility is required for operation on distribution systems rated up to 38kv, 900a continuous current and 40ka asymmetrical momentary current. Software engineering is the systematic approach to the development, operation, maintenance and retirement of software. Ieee recommended practice for calculating shortcircuit. Electrical engineers use powertools to perform harmonic analysis, transient stability analysis, short circuit analysis, and to determine demand load, voltage drop, arcflash hazard analysis and protective device coordination. Redlines are designed to save time and improve efficiencies by using the latest software. This report presents the results of interviews between case environments project team members and personnel in eight software maintenance projects within an agency of the u. Consulting specifying engineer following selective. Sommerville and ieees definitions of software maintenance are very simplified but important in order. Maintained contact toggle switches maintain the position to which they are moved or actuated. Momentary vs interrupting fault duty electric power. Ieee standards documents are developed within the technical committees of. Cs 319 software engineering midterm study guide flashcards. Software maintenance and evolution are characterised by their huge cost and slow speed of impleme ntation. You can double click to edit the text at the symbol.
A new way to managing the digital context of the physical product is required and the answer is the digital twin. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The ssrl holds its operational state for up to 1 2 second during momentary power loss to avoid nuisance shutdowns. The brief loss of power delivery to one or more customers. Definitions the act of keeping, or the expenditure required to keep, an asset in condition to perform efficiently the service for which it is used. Software maintenance and process improvement by cmmi. Our line of gas insulated switchgear is available with load break andor fault interrupters and is designed and tested to ieee and iec standards.
The mean value of the length of time between consecutive unit failures, removals and software upgrades, computed as the ratio of the cumulative observed service years to the number of failures, removals, and servicebulletinrelated upgrades. Pdf evaluation of sustained and momentary interruption impacts. Ieee standards are tools to help guide decision making. The a7 flight program is part of the navigationweapon delivery system on the a7 aircraft. A study in software maintenance june 1993 technical report susan a. Ieee std 5512006 ieee recommended practice for calculating shortcircuit currents in industrial and commercial power systems sponsor power systems engineering committee of the ieee industry applications society approved 9 may 2006 ieeesa standards board approved 2 october 2006 american national standards institute. These activities are a form of emi, although they are generally not labeled as such. The ieee 1219 standard was superseded in june 2010 by p14764.
Software maintenance in software engineering is the modification of a software product after delivery to correct faults, to improve performance or other attributes. There are number of reasons, why modifications are required, some of them are briefly mentioned below. This glossary is an update and expansion of ieee std 7291983, ieee standard glossary of software engineering terminology ansi l3i. Reliability is the capability of the software product to maintain a specified level of performance when used under specified conditions. Ieee recommended practice for protection and coordination of industrial and commercial power systems ieee buff book is an excellent resource for anyone needing help in setting protective devices and coordinating them. Ieee approves new standards project ieee p2755 guide to terms. The modification of a product, after delivery, to correct faults, to improve performance or other attr. A few terms that were included in the initial glossary have. Just input the required load profile, and the program selects the optimum battery configuration.
Software maintenance is defined in the ieee standard for software maintenance, ieee 1219 ieee 1219, as the modification of a software product after delivery to correct faults, to improve performance or other attributes, or to adapt the product to a modified environment. Under asset management, maintenance of physical components and policies forms the. Otpcse service entrance transfer switch open transition 40 amp description features otpc service entrance transfer switches are designed for operation and switching of electrical loads between primary power and standby generator sets. Ieee std 315, ieee standard graphic symbols for electrical and electronics diagrams. Software maintenance is a part of software development life cycle. Manual vs scada data most ignore line devices without scada. The brief loss of power delivery to one or more customers caused by the opening and closing operation of an interrupting device. This perception is perpetuated by users submitting. Describe the relationships among software engineering process, methods, and tools. Ieee standard for software maintenance ieee std 12191998.
Ieee committee report, report on reliability survey of industrial plants, parts ivi, ieee transactions on industry applications, vol. A short between the com and off terminals shuts the relay off, regardless of the. Ieee standard glossary of software engineering terminology. It calls for determining the momentary network fault impedance, which makes it possible to calculate the close and latch rating of the breaker. Finally, the last maintenance process, also an event which does not occur on a daily basis, is the retirement of a piece of software. Sizing battery banks for switchgear and control applications is commonly performed using software designed specifically for that purpose. A new iec standard on the measurement of power quality. New products are not considered upgrades in this context. An onoff switch allows current to flow only when it is in the closed on position. Software maintenance is widely accepted part of sdlc now a days. Market conditions policies, which changes over the time, such as taxation and. For a full and accurate description, refer to the full standard. The ieee power and energy society task force analysed the impact of. However, one study indicated that over 80% of maintenance effort is used for noncorrective actions.
Yet they are inevitable activities almost all software that is useful and successful stimulates usergenerated requests for change and improvements. Ieee guide for electric power distribution reliability. In our electrical software, you can click the action button then click the close circuit menu item to close the circuit switch. The ansi ieee method, which is described in ieee std. Our aim is to describe a landscape for research in software maintenance and. Department ofcommerce nationalbureau ofstandards computerscience andtechnology nbs buctons natlinst. Momentary loads very short in duration, can be fraction of a second lead acid ieee 485 zeven though the load may last for only a few cycles, you must treat it as lasting one full minute nickel cadmium ieee 1115 zeven though the load may last for only a few cycles, you must treat it as lasting one full second examples zswitchgear operation zengine starting. The purpose of software maintenance is defined in the international standard for software maintenance.
Sel651r advanced recloser control schweitzer engineering. Maintained contact toggle switches maintain the position to which they are moved or. Ieee std 1 1591 995 ieee recommended practice for monitoring electrical power quality ieee std 12501995 ieee guide for service to equipment sensitive to momentary voltage disturbances eskom handbook on quality of supply report from advisory committee on electromagnetic compatibility to iec committee of action, 1996. Notetwo circuit breaker or recloser operations each operation being an open followed by a close that briefly interrupt service to one or more customers are defined as two momentary interruptions. Although this is quite simple, an engineer should be capable of performing a straightforward hand calculation either to confirm the results of a software.
They are suitable for use in emergency, legally required, and optional standby applications. One standard ddc computer can control virtually any hvac equipment. In addition, it would have the benefit of no momentary outage in the. Ieee approves new standards project ieee p2755 tm guide to terms and concepts in intelligent process automation. The standard also addresses maintenance activities prior to delivery of. The term software evolution lacks a standard definition some researchers use it as a substitute for maintenance.
The objective of software maintenance is to modify existing software while preserving its integrity. Isoiec 12207 provides a common framework for developing and managing software. The authors are with the department of information systems and decision. Use of this standard is not restricted by size, complexity, criticality, or application of the software product. A literature survey on asset management in electrical power. Evaluation of data submitted in 2009 distribution system reliability. Ieee p2755 to build industry consensus for clarity and consistency in the use of software based intelligent process automation sbipa terminology. The control system can be improved with programming enhancements in the future.
With software configured control, all control panels can be identical, which facilitates installation, checkout, and maintenance. Twentyseven interventions using palmtop computers or mobile phones to deliver ambulatory treatment for smoking cessation, weight loss, anxiety, diabetes management, eating disorders, alcohol use, and healthy eating and physical activity were identified. No additional equipment or installation normally will be required. Ieee standard 1159 2 of an interruption is for a period where. Microprocessorbased protective relays deliver more. Toggle switches are actuated by moving a lever back and forth to open or close an electrical circuit. From the software engineering definition by the ieee, which are the main characteristics included in the definition. Index terms ieee 519, power quality problems, voltage sag, thd, software, commercial. The ansiieee method, which is described in ieee std. A brief description of the method presented by the standard follow.
Cause codes have been adapted to align with both rus and ieee approaches. The sel651r offers exceptional protection and communications capabilities for automatic network reconfiguration, single and threephase tripping, and other distribution automation needs. Software maintenance software maintenance is the process of changing a system after it has been delivered. Exchanging maintenance action information via the extensible markup language xml p484 ieee draft recommended practice for installation design and installation of vented leadacid batteries for stationary applications. Building automation is the automatic centralized control of a buildings heating, ventilation and air conditioning, lighting and other systems through a building management system or building automation system bas. Software maintenance in software engineering is the modification of a software product after delivery to correct faults, to improve performance or other attributes a common perception of maintenance is that it merely involves fixing defects. A new iec standard on the measurement of power quality parameters. Problem understanding the ieee definition of software. Software maintenance in software engineering is the modification of a software product after delivery to correct faults, to improve performance or other attributes routine a series of activities performed regularly. Ieee 485 lead acid batteries for stationary applications.
Modifying a program after it has been put into use. Ieee approves new standards project ieee p2755 guide to. A study in software maintenance sei digital library. The control system contractor shall maintain all software during the warranty period. Otpcse service entrance transfer switch open transition. Appendix b sustained and momentary interruption indices. It receives input data from sensors, cockpit switches, and a panel with which the pilot keys in data. Software engineering is the application of a systematic, disciplined, quantifiable approach to the design, development, operation, and maintenance of software, and the study of these approaches. The modification of a software product after delivery to correct faults, to improve performance or other attributes, or to adapt the product to a modified environment. It stands for all the modifications and updations done after the delivery of software product. Software maintenance in software engineering is the modification of a software product after.
Table 153 in the buff book shows the recommended curve time intervals between different protective devices. Note that the codes recommended in column 1 of table 2 link russ codes that borrowers are accustomed to seeing with the codes prescribed by ieee. The objectives of building automation are improved occupant comfort, efficient operation of building systems, reduction in energy consumption and operating costs, and improved. Its main purpose is to modify and update software application after delivery to. This standard details methods for defining the dc loads and for sizing a leadacid battery to supply those loads in full float operation.