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Grid-Connected Microgrid Battery Energy Storage Systems

 

 

 

 

 

 

 

 

 

 

 

 

 

Overview of Technical Specifications for Grid-Connected Microgrid Battery Energy Storage Systems

A. Rahman Khalid, et. al

Abstract:  Increasing distributed topology design implementations, uncertainties due to solar photovoltaic systems generation intermittencies, and decreasing battery costs, have shifted the direction towards integration of battery energy storage systems (BESSs) with photovoltaic systems to form renewable microgrids (MGs). Specific benefits include, but are not limited to, seamless switching and islanding operations during outages and ancillary grid services. The evolution of battery chemistries and other components has also further enhanced practicality; however, developing these multifaceted MGs involves complexity in the design process. Consequently, stakeholders rely on connection standards and operational requirements to guarantee reliable and safe grid-connected operations.

This paper presents a technical overview of battery system architecture variations, benchmark requirements, integration challenges, guidelines for BESS design and interconnection, grid codes and standards, power conversion topologies, and operational grid services. In addition, a comprehensive review of the control strategies for battery equalization, energy management systems, communication, control of multiple BESSs, as well as a discussion on protection blinding and intentional islanding using BESSs is also provided. Finally, a discussion of the islanded and black start operation results for time-based analysis and standard validation of a 3MW/9MWh BESS in a grid-connected MG at the Florida International University (FIU) Engineering Campus is presented.

Interconnected Electric Power Production Sources “Microgrids”

“Landscape with a Farm House and Windmill” (1680) / Jacob Isaaksz van Ruisdael

We have always taken a forward-looking approach to the National Electrical Code (NEC) because there is sufficient supply of NEC instructors and inspectors and not enough subject matter experts driving user-interest ideas into it.  Today we approach the parts of the 2023 NEC that cover wiring safety for microgrid systems; a relatively new term of art that appropriates safety and sustainability concepts that have existed in electrotechnology energy systems for decades.

Turn to Part II of Article 705 Interconnected Electric Power Production Sources:

Free Access 2023 National Electrical Code

You will notice that microgrid wiring safety is a relatively small part of the much larger Article 705 Content.   There were relatively minor changes to the 2017 NEC in Section 705.50  — but a great deal of new content regarding Microgrid Interconnection Devices, load side connections, backfeeding practice and disconnecting means — as can be seen in the transcripts of Code-Making Panel 4 action last cycle:

Code‐Making Panel 4 Public Input Report (692 Pages)

Code-Making Panel 4 Public Comment Report (352 Pages)

Keep in mind that the NEC says nothing (or nearly very little, in its purpose stated in Section 90.2) about microgrid economics or the life cycle cost of any other electrical installation.  It is the claim about economic advantages of microgrids that drive education facility asset management and energy conservation units to conceive, finance, install, operate and — most of all — tell the world about them.

In previous posts we have done our level best to reduce the expectations of business and finance leaders of dramatic net energy savings with microgrids — especially on campuses with district energy systems.  Microgrids do, however, provide a power security advantage during major regional contingencies — but that advantage involves a different set of numbers.

Note also that there is no user-interest from the education facility industry — the largest non-residential building construction market in the the United States — on Panel 4.   This is not the fault of the NFPA, as we explain in our ABOUT.

The 2023 NEC was released late last year.

 

The 2026 revision cycle is in full swing with public comment on the First Draft receivable until August 24, 2024.  Let’s start formulating our ideas using the 2023 CMP-4 transcripts.   The link below contains a record of work on the 2023 NEC:

2026 National Electrical Code Workspace

We collaborate with the IEEE Education & Healthcare Facility Committee which meets online 4 times per month in European and American time zones.  Since a great deal of the technical basis for the NEC originates with the IEEE we will also collaborate with other IEEE professional societies.

Mike Anthony’s father-in-law and son maintaining the electrical interactive system installed in the windmill that provides electricity to drive a pump that keeps the canal water at an appropriate level on the family farm near Leeuwarden, The Netherlands.

Issue: [19-151]

Category: Electrical, Energy

Colleagues: Mike Anthony, Jim Harvey, Kane Howard, Jose Meijer

Archive / Microgrids

 

Pathways 100

Today we break down the literature for exterior and interior pathways in education communities.   We limit the term “pathway” to refer to human pathways (as in egress and ingress paths); not wiring or piping pathways.   Maximum distance of travel from within a building and along an egress path toward safety is a core topic in building safety literature.  Starting 2023 we will break down coverage of subject catalogs and bibliographies:

Pathways 100: Survey of all titles for both the exterior and interior environments

Pathways 200: Review of codes, standards and guidelines for building interiors

Related recent research:

Hallways and stairways lighting system cost reduction

The research on circadian rhythm parameters testing of lighting quality in classrooms

Research and discussion on classroom blackboard lighting

Pathways 300: Review of codes, standards and guidelines campus environment outside the buildings; all seasons

Pathways 500: Review of noteworthy litigation.   Campus pathways are rich in possibilities for legal actions so we will refresh our understanding of the landmark decisions.

This breakdown is “somewhat” inspired by recent action by ASHRAE International to expand the scope of ASHRAE 90.1 to heating and cooling environments outside buildings.   The new title of ASHRAE 901. includes the word “Site”, which is another way of saying “the world” outside buildings.   Standards Michigan commented on the consequences of doing this in the proposal stages in 2020-2021.

The topic involves titles from many standards setting organizations; among them:

American National Standards Institute

C136-series for street lighting

International Code Council (accessible and useable ingress and egress entrances, paths and exits)

International Building Code: Chapter 10 Means of Egress

ICC A117 Accessibility Meeting Agenda December 15 2022 (Pathways)

ICC A117.1 2023 Meeting Calendar Accessible and Useable Buildings

Modifications for A117.1 12-1-2022 meeting

A117.1 11-17-2022 Agenda 20

A117.1 7-28-2022 Minutes 12

IFC §909.21.6 Proposal FS118-21 Pressurization systems for elevator pathways (now being discussed during the ICC Group A Committee Action Hearings in September)

American Society of Civil Engineers (roads, sidewalks)

American Society of Mechanical Engineers

ASME A17.1-2019: Safety Code for Elevators and Escalators

Elevators & Lifts

Institute of Electrical and Electronic Engineers (wayfinding along unofficial footpaths using the internet of small things)

Education & Healthcare Facility Electrotechnology

A BIM-Based Coordination Support System for Emergency Response

Computer Vision Method in Means of Egress Obstruction Detection

Recommended Practice for the Design of Power Systems Supplying Lighting Systems in Commercial and Industrial Facilities

Wayfinding: Current Research

 

National Electrical Manufacturers Association

National Fire Protection Association (fire protection for interior premises, fire truck routes, electric signage, security)

2021 NFPA 101 Life Safety Code

Chapter 3 Means of Egress

Chapter 12-13 Assembly Occupancies

Chapter 14-15 Educational Occupancies

Chapter 18-19 Health Care Occupancies

2022 Standard for Emergency and Standby Power Systems

Chapter 5 – Emergency Power Supply: Energy Sources, Converters and Accessories

ASTM International Committee C09 on Concrete and Concrete Aggregates

Standard Terminology Relating to Concrete and Concrete Aggregates

…And about 20 others.

We might venture onto the minefield of sensitivities about signage: too much, too many, too big, too small?  There are signs everywhere in academia.

Many titles in the foregoing list are inspired by legal requirements of the Americans with Disabilities Act administered by the US Department of Justice

As usual, we’ll only have time to identify the titles and concepts in motion and set up a separate markup session.   Open to everyone; use the login credentials at the upper right of our home page.

Texas Tech

MORE:

International Building Code §3104 Pedestrian Walkways and Tunnels 

2023 National Electrical Code Article 420 — Luminaires, Lampholders, and Lamps

2023 National Electrical Code Article 600 – Electric Signs and Outline Lighting

2023 National Electrical Code Article 620 — Elevators, Dumbwaiters, Escalators, Moving Walks, Lifts and Chairlifts

Bibliography

Shaping the Sidewalk Experience

The 8 Principles of Sidewalks

Federal Highway Administration University Course on Bicycle and Pedestrian Transportation

“The Via Appia: A Case Study in the Political Geography of Imperialism” Hannah Friedman.  This article, published in the Journal of Historical Geography in 2011, examines the Appian Way as a product of Roman imperialism and a reflection of Roman attitudes toward the landscape and its inhabitants. The author draws on both textual and archaeological evidence to explore the road’s impact on the regions it passed through.

“The Appian Way: The Road that Built the Roman Empire” by Richard Talbert – Cambridge University Press 2012.  A a comprehensive study of the Appian Way and its significance to the Roman Empire. The author draws on a wide range of archaeological and historical evidence to explore the road’s construction, use, and legacy.

 

 

Acoustical Engineering

Children’s Hospital Neonatal Intensive Care

Some of the common electro-technologies used in a neonatal care unit include:

  • Incubators: These temperature-controlled units create a controlled environment to keep premature or sick infants warm and protected.
  • Ventilators: Mechanical ventilators assist newborns with respiratory distress by delivering oxygen and helping them breathe.
  • Monitors: These devices track vital signs such as heart rate, oxygen levels, blood pressure, and temperature to ensure the baby’s health and detect any abnormalities.
  • Phototherapy Lights: Special lights are used to treat jaundice in newborns, helping to break down excess bilirubin in the blood.
  • Intravenous Pumps: These pumps are used to deliver medications, fluids, and nutrients directly into the baby’s bloodstream.
  • Feeding Tubes: For infants who are unable to feed orally, feeding tubes are used to deliver breast milk or formula directly into their stomach.
  • Blood Gas Analyzers: These machines measure the levels of oxygen, carbon dioxide, and other gases in a baby’s blood to monitor respiratory status and acid-base balance.
  • Infusion Pumps: Used to administer controlled amounts of fluids, medications, or nutrients to newborns.
  • CPAP/BiPAP Machines: Continuous Positive Airway Pressure (CPAP) and Bi-level Positive Airway Pressure (BiPAP) machines help newborns with breathing difficulties by providing a continuous flow of air pressure.
  • Neonatal Resuscitation Equipment: This includes equipment such as resuscitation bags, endotracheal tubes, laryngoscopes, and suction devices used during emergency situations to assist with newborn resuscitation.

It’s important to note that specific tools and equipment may vary depending on the level of neonatal care provided by the unit, the needs of the infants, and the policies of the healthcare facility.

Neonatal care, as a specialized field, has been shaped by the contributions of several pioneers in medicine. Here are a few notable figures who have made significant advancements in neonatal care:

  • Dr. Virginia Apgar was an American obstetrical anesthesiologist who developed the Apgar score in 1952. The Apgar score is a quick assessment tool used to evaluate the overall health of newborns immediately after birth. It assesses the baby’s heart rate, respiratory effort, muscle tone, reflex irritability, and color, providing valuable information for prompt intervention and monitoring.
  • Dr. Martin Couney, a pioneering physician, established incubator exhibits at world fairs and amusement parks in the early 20th century. He promoted the use of incubators to care for premature infants and played a significant role in popularizing the concept of neonatal intensive care.
  • Dr. Virginia A. Apgar, an American pediatrician and neonatologist, made significant contributions to the field of neonatology. She specialized in the care of premature infants and conducted extensive research on neonatal resuscitation and newborn health. She also developed the Apgar scoring system, although unrelated to Dr. Virginia Apgar mentioned earlier.
  • Dr. Lula O. Lubchenco was an influential researcher and neonatologist who made important contributions to the understanding of newborn growth and development. She developed the Lubchenco Growth Chart, which provides a standardized assessment of a newborn’s size and gestational age, aiding in the identification and monitoring of growth abnormalities.
  • Dr. Mary Ellen Avery was a renowned American pediatrician and researcher whose work focused on understanding and treating respiratory distress syndrome (RDS) in premature infants. She identified the importance of surfactant deficiency in RDS and contributed to the development of surfactant replacement therapy, revolutionizing the care of preterm infants.

These individuals, among many others, have played pivotal roles in advancing the field of neonatal care, improving the understanding, diagnosis, treatment, and overall outcomes for newborn infants.

Healthcare Facilities Code

IEEE  Education & Healthcare Facility Electrotechnology

 

Healthcare Facilities Code

“The Doctor”  1891 Sir Luke Fildes

The NFPA 99 Healthcare Facilities Code committee develops a distinct consensus document (i.e. “regulatory product”) that is distinct from National Electrical Code Article 517; though there are overlaps and gaps that are the natural consequence of changing technology and regulations.  It is worthwhile reviewing the scope of each committee:

NFPA 99 Scope: This Committee shall have primary responsibility for documents that contain criteria for safeguarding patients and health care personnel in the delivery of health care services within health care facilities: a) from fire, explosion, electrical, and related hazards resulting either from the use of anesthetic agents, medical gas equipment, electrical apparatus, and high frequency electricity, or from internal or external incidents that disrupt normal patient care; b) from fire and explosion hazards; c) in connection with the use of hyperbaric and hypobaric facilities for medical purposes; d) through performance, maintenance and testing criteria for electrical systems, both normal and essential; and e) through performance, maintenance and testing, and installation criteria: (1) for vacuum systems for medical or surgical purposes, and (2) for medical gas systems; and f) through performance, maintenance and testing of plumbing, heating, cooling , and ventilating in health care facilities.

NFPA 70 Article 517 Scope:  The provisions of this article shall apply to electrical construction and installation criteria in healthcare facilities that provide services to human beings.  The requirements in Parts II and III not only apply to single-function buildings but are also intended to be individually applied to their respective forms of occupancy within a multi-function building (e.g. a doctor’s examining room located within a limited care facility would be required to meet the provisions of 517.10)   Informational Note: For information concerning performance, maintenance, and testing criteria, refer to the appropriate health care facilities documents.

In short, NFPA 70 Article 517 is intended to focus only on electrical safety issues though electrotechnology complexity and integration in healthcare settings (security, telecommunications, wireless medical devices, fire safety, environmental air control, etc.) usually results in conceptual overlap with other regulatory products such as NFPA 101 (Life Safety Code) and the International Building Code.

Several issues were recently debated by the Article 517 technical committee during the 2023 National Electrical Code Second Draft meetings

  • The conditions under which reconditioned electrical equipment be installed in healthcare settings; contingent on listing and re-certification specifics.
  • Relaxation of the design rules for feeder and branch circuit sizing through the application of demand factors.
  • Application of ground fault circuit interrupters.
  • “Rightsizing” feeder and branch circuit power chains (Demand factors in Section 517.22)
  • Patient care space categories
  • Independence of power sources (517.30)

There are, of course, many others, not the least of which involves emergency management.  For over 20 years our concern has been for the interdependency of water and electrical power supply to university hospitals given that many of them are part of district energy systems.

We need to “touch” this code at least once a month because of its interdependence on other consensus products by other standards developing organizations.  To do this we refer NFPA 99 standards action to the IEEE Education & Healthcare Facilities Committee which meets online four times monthly in European and American time zones.

The transcript of NEC Article 517 Public Input for the 2023 revision of NFPA 70 is linked below.  (You may have to register your interest by setting up a free-access account):

Code-Making Panel 15 (NEC-P15) Public Input Report

Code-Making Panel 15 (NEC-P15) Public Comment Report

Technical committees will meet in June to endorse the 2023 National Electrical Code.

Public consultation on the Second Draft closes May 31st. Landing page for selected sections of the 2024 revision  of NFPA 99 are linked below:

Electrical Systems (HEA-ELS)

Fundamentals (HEA-FUN)

Health Care Emergency Management and Security (HEA-HES)

Second Draft Comments are linked below:

Electrical Systems (HEA-ELS)

Fundamentals (HEA-FUN)

Health Care Emergency Management and Security (HEA-HES)

NITMAM closing date: March 28, 2023

We break down NFPA 70 and NFPA 99 together and keep them on the standing agenda of both our Power and Health colloquia; open to everyone.  See our CALENDAR for the next online meeting.

"The trained nurse has become one of the great blessings of humanity, taking a place beside the physician and the priest" - William Osler"While we try to teach our children all about life, our children teach us what life is all about" - Angela Schwindt "The true art of pediatrics lies not only in curing diseases but also in preventing them" - Abraham JacobiGermany

Issues: [12-18, [15-97] and [16-101]

Contact: Mike Anthony, Jim Harvey, Robert Arno, Josh Elvove, Joe DeRosier, Larry Spielvogel

NFPA Staff Liaison: Jonathan Hart

Archive / NFPA 99

 

 

 

2028 National Electrical Safety Code

IEEE Standards Association Public Review

Related Issues and Recent Research | Federal Legislation

“Rain in Charleston” 1951 Thomas Fransioli

This title sets the standard of care for construction, operation and maintenance of power and telecommunication infrastructure on the supply side of the point of common coupling. It is the first title to contemplate when weather disasters happen; with most public utilities bound to its best practice assertions by statute. Pre-print of Change Proposals for changes to appear in 2028 Edition will be available by 1 July 2025; with 24 March 2026 as the close date for comments on proposed changes.

Project Introduction for the 2028 Edition (2:39 minutes)

NESC 2028 Revision Schedule

Changes proposals for the Edition will be received until 15 May 2024

Proposals for the 2028 National Electrical Safety Code

Project Workspace: Update Data Tables in IEEE Recommended Practice for the Design of Reliable Industrial and Commercial Power Systems

Painting by Linda Kortesoja Klenczar

Federal Energy Regulatory Commission: Electrical Resource Adequacy

Relevant Research

NARUC Position on NFPA (NEC) and IEEE (NESC) Harmonization

The standard of care for electrical safety at high and low voltage is set by both the NEC and the NESC. There are gaps, however (or, at best “gray areas”) — the result of two technical cultures: utility power culture and building fire safety culture. There is also tradition. Local system conditions and local adaptation of regulations vary. Where there is a gap; the more rigorous requirement should govern safety of the public and workers.

The 2023 National Electrical Safety Code (NESC)– an IEEE title often mistaken for NFPA’s National Electrical Code (NEC) — was released for public use about six months ago; its normal 5-year revision cycle interrupted by the circumstances of the pandemic.   Compared with the copy cost of the NEC, the NESC is pricey, though appropriate for its target market — the electric utility industry.  Because the 2023 revision has not been effectively “field tested” almost all of the available support literature is, effectively, “sell sheets” for pay-for seminars and written by authors presenting themselves as experts for the battalions of litigators supporting the US utility industry.  Without the ability to sell the NESC to prospective “insiders” the NESC would not likely be commercial prospect for IEEE.   As the lawsuits and violations and conformance interests make their mark in the fullness of time; we shall see the 2023 NESC “at work”.

IEEE Standards Association: Additional Information, Articles, Tools, and Resources Related to the NESC

Office of the President: Economic Benefits of Increasing Electric Grid Resilience to Weather Outages

Research Tracks:

NARUC Resolution Urging Collaboration Between the National Electrical Safety Code and the National Electrical Code

Reliability of Communication Systems needed for the autonomous vehicle transformation

  1. Smart Grid Technologies:
    • Investigating advanced technologies to enhance the efficiency, reliability, and sustainability of power grids.
  2. Energy Storage Systems:
    • Researching and developing new energy storage technologies to improve grid stability and accommodate intermittent renewable energy sources.
  3. Distributed Generation Integration:
    • Studying methods to seamlessly integrate distributed energy resources such as solar panels and wind turbines into the existing power grid.
  4. Grid Resilience and Security:
    • Exploring technologies and strategies to enhance the resilience of power grids against cyber-attacks, natural disasters, and other threats.
  5. Demand Response Systems:
  6. Advanced Sensors and Monitoring:
    • Developing new sensor technologies and monitoring systems to enhance grid visibility, detect faults, and enable predictive maintenance.
  7. Power Quality and Reliability:
    • Studying methods to improve power quality, reduce voltage fluctuations, and enhance overall grid reliability.
  8. Integration of Electric Vehicles (EVs):
    • Researching the impact of widespread electric vehicle adoption on the grid and developing smart charging infrastructure.
  9. Grid Automation and Control:
    • Exploring advanced automation and control strategies to optimize grid operations, manage congestion, and improve overall system efficiency.
  10. Campus Distribution Grid Selling and Buying 

 

Relevant Technical Literature

IEC 60050 International Electrotechnical Vocabulary (IEV) – Part 601: Generation, transmission and distribution of electricity | April 16

Recommended Practice for Battery Management Systems in Energy Storage Applications | Comments Due March 26

Medical electrical equipment: basic safety and essential performance of medical beds for children | April 26

Medical electrical equipment: basic safety and essential performance of medical beds for children | April 26

 

Standards:

Presentation | FERC-NERC-Regional Entity Joint Inquiry Into Winter Storm Elliott

IEEE Guide for Joint Use of Utility Poles with Wireline and/or Wireless Facilities

NESC Rule 250B and Reliability Based Design

NESC Requirements (Strength and Loading)

Engineering Analysis of Possible Effects of 2017 NESC Change Proposal to Remove 60′ Exemption

National Electrical Safety Code Workspace

Joint Use of Electric Power Transmission & Distribution Facilities and Equipment

A Framework to Quantify the Value of Operational Resilience for Electric Power Distribution Systems

August 14, 2003 Power Outage at the University of Michigan

Technologies for Interoperability in Microgrids for Energy Access

National Electrical Safety Code: Revision Cycles 1993 through 2023

 

February 24, 2023

The new code goes into effect 1 February 2023, but is now available for access on IEEE Xplore! Produced exclusively by IEEE, the National Electrical Safety Code (NESC) specifies best practices for the safety of electric supply and communication utility systems at both public and private utilities.  The bibliography is expanding rapidly:

NESC 2023: Introduction to the National Electrical Safety Code

NESC 2023: Rule Changes

2023 National Electrical Safety Code® (NESC®) – Redline

2023 National Electrical Safety Code (NESC®) Handbook

NESC 2023: Safety Rules for Installation and Maintenance of Overhead Electric Supply

NESC 2023: Safety Rules for the Installation and Maintenance of Underground Electric Supply and Communication Lines

NESC 2023: Rules for Installation and Maintenance of Electric Supply Stations

IEEE Digital Library

Grid Edge Visibility: Gaps and a road map

October 31, 2022

The IEEE NESC technical committee has released a “fast track” review of proposed changes to fault-managed power system best practice:

CP5605 Provides a definition of new Fault Managed Power System (FMPS) circuits used for the powering of
communications equipment clearly defines what constitutes a FMPS circuit for the purposes of application of the NESC
Rules of 224 and 344
https://ieee-sa.imeetcentral.com/p/eAAAAAAASPXtAAAAADhMnPs

CP5606 Provides new definitions of Communication Lines to help ensure that Fault Managed Power Systems (FMPS)
circuits used for the exclusive powering of communications equipment are clearly identified as communications lines
and makes an explicit connection to Rule 224B where the applicable rules for such powering circuits are found.
https://ieee-sa.imeetcentral.com/p/eAAAAAAASPXpAAAAAFfvWIs

CP5607 The addition of this exception permits cables containing Fault Managed Power System (FMPS) circuits used for
the exclusive powering of communications equipment to be installed without a shield.
https://ieee-sa.imeetcentral.com/p/eAAAAAAASPXuAAAAAEEt3p4

CP5608 The addition of this exception permits cables containing Fault Managed Power System (FMPS) circuits used for
the exclusive powering of communications equipment to be installed without a shield.
https://ieee-sa.imeetcentral.com/p/eAAAAAAASPXvAAAAAGrzyeI

We refer them to the IEEE Education & Healthcare Facilities Committee for further action, if any.

 

August 5, 2022

We collaborate closely with the IEEE Education & Healthcare Facilities Committee (IEEE E&H) to negotiate the standard of care for power security on the #SmartCampus  since many campus power systems are larger than publicly regulated utilities.  Even when they are smaller, the guidance in building the premise wiring system — whether the premise is within a building, outside the building (in which the entire geography of the campus footprint is the premise), is inspired by IEEE Standards Association administrated technical committees.

Northeast Community College | Norfolk, Nebraska

Today we begin a list of noteworthy changes to be understood in the next few Power colloquia.  See our CALENDAR for the next online meeting.

  1. New rules 190 through 195 cover photovoltaic generating stations.  Rule 116c adds an exception for short lengths of insulated power cables and short-circuit protection if the situation involves fewer than 1,000 volts.
  2. Rule 320B has been revised to clarify separations that apply to communications and supply in different conduit systems.
  3. Table 410-4 is based on the latest arc flash testing on live-front transformers.
  4. Rule 092A adds an exception allowing protection, control, and safety battery systems to not be grounded.
  5. Rules 234 B1, C1, D1 were revised to better present vertical and horizontal wind clearances, and to coordinate requirements with the new Table 234-7.
  6. Rule 120A was revised to provide correction factors for clearances on higher elevations.
  7. Table 253-1 has been revised to reduce the load factor for fiber-reinforced polymer components under wire tension—including dead ends—for Grade C construction.
  8. Rule 410A now requires a specific radio-frequency safety program for employees who might be exposed.
  9. In the Clearances section, as well as in the specification of the Grade of Construction in Table 242-1, the Code further clarifies the use of non-hazardous fiber optic cables as telecom providers continue to expand their networks.
  10. Revisions in the Strength & Loading sections include modified Rule 250C, which addresses extreme wind loading for overhead lines. Two wind maps are now provided instead of the previous single one. A map for Grade B, the highest grade of construction, with a Mean Recurrence Interval (MRI) of 100 years (corresponding to a one percent annual probability of occurrence) is provided in place of the previous 50–90-year MRI map. For Grade C construction, a separate 50-year MRI (two percent annual probability of occurrence) map is now provided. In the previous Code, a factor was applied to the 50–90-year MRI map for application to Grade C.
  11. Changes were also made to the method of determining the corresponding wind loads, consistent with the latest engineering practices as an example of a Code revision focused on public safety, the ground end of all anchor guys adjacent to regularly traveled pedestrian thoroughfares, such as sidewalks, and similar places where people can be found must include a substantial and conspicuous marker to help prevent accidents. The previous Code did not require the marking of every such anchor guy.
  12. Significant revisions were made in Section 14 covering batteries. Previous editions of the code were based on lead-acid technology and batteries only used for backup power. The 2023 Code incorporates the new battery technologies and addresses energy storage and backup power.
  13. A new Section 19 of the code covers photovoltaic generating stations, with sections addressing general codes, location, grounding configurations, vegetation management, DC overcurrent protection, and DC conductors. These new rules accommodate large-scale solar power projects.
  14. In the Clearances section, all rules for wireless antenna structures have been consolidated in the equipment section (Rule 238 and 239), which makes the Code more user-friendly.
  15. A new subcommittee was created focusing on generating stations, with the original subcommittee continuing to address substations.
  16. A working group is investigating Fault Managed Power Systems (FMPS) cables as the technology may be used for 5G networks. The team is looking at possible impacts, including clearances and work rules.

 

February 18, 2021

 

Several proposals recommending improvements to the 2017 National Electrical Safety Code (NESC) were submitted to the IEEE subcommittees drafting the 2022 revision of the NESC.   Some of the proposals deal with coordination with the National Electrical Code — which is now in its 2023 revision cycle.  Keep in mind that that NESC is revised every 5 years at the moment; the NEC is revised every 3 years.

The original University of Michigan standards advocacy enterprise has been active in writing the NESC since the 2012 edition and set up a workspace for use by electrical professionals in the education industry.   We will be using this workspace as the 2022 NESC continues along its developmental path:

IEEE 2022 NESC Workspace

The revision schedule — also revised in response to the circumstances of the pandemic — is linked below::

NESC 2023 Edition Revision Schedule*

 

The NESC is a standing item on the 4-times monthly teleconferences of the IEEE Education & Healthcare Facilities committee.  The next online meeting is shown on the top menu of the IEEE E&H website:

IEEE E&H Committee

We have a copy of the first draft of the 2023 NESC and welcome anyone to join us for an online examination during any of Power & ICT teleconferences.  See our CALENDAR for the next online meeting.

Business unit leaders, facility managers and electrical engineers working in the education facilities industry may be interested in the campus power system reliability database.   Forced outages on large research campuses, for example, can have enterprise interruption cost of $100,000 to $1,000,000 per minute.    The campus power system forced outage database discriminates between forced outages attributed to public utility interruptions and forced outages attributed to the university-owned power system.   The E&H committee will convey some of the discipline applied by the IEEE 1366 technical committee into its study of campus power systems and, ultimately, setting a benchmark for the standard of care for large university power systems.

 

 

* The IEEE changed the nominal date of the next edition; likely owed to pandemic-related slowdown typical for most standards developing organizations.

Issue: [16-67]

Contact: Mike Anthony, Robert G. Arno, Lorne Clark, Nehad El-Sharif, Jim Harvey, Kane Howard, Joe Weber, Guiseppe Parise, Jim Murphy

Category: Electrical, Energy Conservation & Management, Occupational Safety

ARCHIVE: University of Michigan Advocacy in the NESC 2007 – 2017

LEARN MORE:

P1366 – Guide for Electric Power Distribution Reliability Indices 

University Design Guidelines that reference the National Electrical Safety Code

 

K-12 School Security

CLICK ON IMAGE (Note that the link may move around quite a bit)

 

Clery Act

Solar (Winter)

Sie strahlt vor Freude über ihre Auszeichnung – TH-Alumna Melanie Klaus. Für ihre Bachelorarbeit im Bereich Erneuerbare Energien wurde sie vom Solarenergieförderverein Bayern geehrt. In ihrer Bachelorarbeit im Studiengang Elektro- und Informationstechnik untersuchte sie das Zusammenspiel von Wind- und Solarenergie und den Nutzen, der sich hieraus für die regenerative Energieerzeugung erzielen lässt. Untersucht wurde also die Nutzung der natürlichen Kombination von Wind und Sonne für die Energieerzeugung. Um die Rentabilität dieser Einspeisekombination zu ermitteln, hat Melanie Klaus ein Software-Tool entwickelt, welches zur Planung und Simulation abgestimmter Photovoltaik-Wind-Kombinationen dient und bereits für die Errichtung einer Photovoltaik-Anlage zu einem Windpark eingesetzt wird.

Starting 2023 we separated our coverage of solar energy standards from our standing Electrical and Energy colloquia and placed emphasis on seasonal life cycle returns.   We start with the following titles

IEC TC 82 Solar photovoltaic energy systems

Underwriters Laboratories 1703 PV Module Certification

ASTM E772 Standard Terminology of Solar Energy Conversion

IEEE 1562 Guide for Array and Battery Sizing in Stand-Alone Photovoltaic Systems

NEMA Solar Photovoltaic Council

NECA 412 Standard for Installing and Maintaining Photovoltaic Power Systems

NFPA 70 Articles 690-691

NFPA 70 Articles 705 & 855

International Code Council Section 1607 Photovoltaic panels or modules

ASHRAE International: 90.1 Building Energy Code & 189.1 Green Energy Code

Time permitting: Example design specification and construction contract.

"Education is simply the soul of a society as it passes from one generation to another" - G.K. Chesterton

Other standards developers and publishers are also present in this domain but this list is where we will start given that we only have an hour.   Join us today at 16:00 with the login credentials at the upper right of our home page.

Readings:

What are the hidden costs of solar panels?

Do We Have Enough Silver, Copper, And Other Materials To Keep Up With The Growth Of Solar?

Mining Raw Materials for Solar Panels: Problems and Solutions

Grid-Connected Microgrid Battery Energy Storage Systems

Solar Panels on King’s College Chapel Roof

“…The solar panels will populate the gothic chapel roof, producing an approximate 105,000 kWh of energy a year – enough to run the chapel’s electricity, and saving around £20,000 in energy bills per year. The college confirmed that any excess energy would be sold off to the national grid.

King’s College Announcement

Solar Panels on King’s College Chapel Roof

Solar panels perform better when listening to music:

A 2013 study by researchers at Imperial College London and Queen Mary University of London showed that solar panels actually work better when exposed to music, of multiple genres. Scientists at the university proved that when exposed to high pitched sounds, like those found in rock and pop music, the solar cells’ power output increased by up to 40 percent. Classical music was also found to increase the solar cells’ energy production, but slightly less so than rock and pop, as it generally plays at a lower pitch than pop and rock. Whether they know it or not, British band Coldplay are just one of the artists benefitting from this research. During their 2021 tour, they installed solar photovoltaic panels in the build-up to each show, “behind the stage, around the stadium and where possible in the outer concourses”…

BS 7671 Requirements for Electrical Installations

The Major Differences in Electrical Standards Between the U.S. and Europe

Representative Calculation: (WAG)

To determine how much electrical power and lighting 12 kilowatts (kW) will provide for an educational facility, we need to consider the following factors:

    1. Power Distribution: How the 12 kW will be distributed across different electrical needs such as lighting, computers, HVAC (heating, ventilation, and air conditioning), and other equipment.
    2. Lighting Requirements: The specific lighting requirements per square foot or room, which can vary based on the type of facility (classrooms, libraries, laboratories, etc.).
    3. Efficiency of Lighting: The type of lighting used (e.g., LED, fluorescent, incandescent) as this affects the power consumption and lighting output.

We start with lighting.

    1. Lighting Efficiency:
      • LED lights are highly efficient, typically around 100 lumens per watt.
      • Fluorescent lights are less efficient, around 60-70 lumens per watt.
    2. Lighting Power Calculation:
      • 12 kW (12,000 watts) of LED lighting at 100 lumens per watt would provide: 12,000 watts×100 lumens/watt=1,200,000 lumens
    3. Illumination Requirements:
      • Classroom: Approximately 300-500 lux (lumens per square meter).
      • Library or laboratory: Approximately 500-750 lux.
    4. Area Coverage:
      • If we target 500 lux (which is 500 lumens per square meter), we can calculate the area covered by the lighting: (1,200,000 lumens)/ 500 lux=2,400 square meters

Now we need to allocate power to other loads.

    1. Lighting: Assuming 50% of the 12 kW goes to lighting:
      • Lighting Power: 6 kW (6,000 watts)
      • Using the previous calculation: 6,000 watts×100 lumens/watt=600,000 lumens
      • Area Coverage for lighting (at 500 lux): (600,000 lumens)/500 lux=1,200 square meters
    2. Other Electrical Needs:
      • Computers and equipment: Typically, a computer lab might use around 100 watts per computer.
      • HVAC: This can vary widely, but let’s assume 4 kW is allocated for HVAC and other systems.

Breakdown:

    • Lighting: 6 kW
    • Computers/Equipment: 2 kW (e.g., 20 computers at 100 watts each)
    • HVAC and other systems: 4 kW

Summary

    • Lighting: 12 kW can provide efficient LED lighting for approximately 1,200 square meters at 500 lux.
    • General Use: When distributed, 12 kW can cover lighting, a computer lab with 20 computers, and basic HVAC needs for a small to medium-sized educational facility.

The exact capacity will vary based on specific facility needs and equipment efficiency.

 

 

 

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