Thursday

Seminar

Cable System Reliability, Testing & Failure Analysis at Windfarms

3/1/18
8:00AM - 11:45AM
Tom Sandri, Shermco Industries
Description:

Renewable Energy programs have resulted in a huge increase in the number of windfarm projects commissioned over the past decade. Underground cabling is typically chosen within windfarms since it is practical with regards to the dual use of the land and it is aesthetically preferred. The most common circuit configurations comprise of radial feeders from the windfarm substation and daisy chain from one turbine to the next via switches at each step up or kiosk transformer. A feeder (collector cable) may have any number of turbines connected, with the most heavily loaded cable being the section that runs from the substation to the first turbine. This section of the feeder may be several thousands of feet long depending on the substation location and may have one or more joints (splices) in it.

Wind farm collector circuits in the United States comprise mostly of medium voltage cables. They are typically 35 kV rated, XLPE insulated with stranded aluminum conductors, direct buried in the ground. Many of these cable systems have exhibited in service problems and failures which have adversely affected windfarm operating costs and reliability. This paper will review trenching, installation and backfilling along with cable system formation and screen bonding methods. Typical load patterns compared to that of normal T&D cables will also be reviewed. We will look at failure trends and describe the investigation of such failures at two windfarm and provide a summary of the root cause analysis findings. Finally; installation, acceptance and maintenance testing practices will be identified and discussed.

Seminar

Grounding and Bonding to Avoid Disasters

3/1/18
8:00AM - 11:45AM
David Brender, Copper Development Association, Inc.
Description:

Data centers and other sensitive facilities have both unique and universal powering, grounding and bonding requirements, often overlooked, and not understood by most designers and contactors. By providing proper bonding and grounding of facilities greatly diminishes the vulnerability to transients, and is usually quite cost-effective with quick paybacks.

The focus of this seminar is to recommend wiring and grounding techniques and practices that should be part of the design of new or renovated structures, and to examine in particular several case studies of actual data centers that were designed above Code minimums.

Among the topics we will discuss:

  • The cause of power quality problems
  • Typical wiring versus wiring for sensitive loads
  • Why the National Electrical Code is inadequate for sensitive locations Grounding;
  • What's required and what's desired
  • Ground resistance, ground loops
  • Ground rod spacing, depth, overlapping influence
  • Backfill materials
  • General wiring practice, separating sensitive loads
  • Best practices of case histories
  • Recommended practices of IEEE 1100

The particular case studies will amply illustrate application of proper electrical infrastructure in the elimination and prevention of power quality problems, and the results that were achieved at minimal cost. The presentation is completely generic in nature, and no branded products are promoted or recommended.

Seminar

NETA Certification Exam: Useful Information on Preparation & Understanding of the Content

3/1/18
8:00AM - 11:45AM
Dan Hook, Western Electrical Services, Inc.
Description:

TBD

Seminar

Transformer Protection and Testing

3/1/18
8:00AM - 11:45AM
Vijay Sundaram, Megger
Description:

Transformers are one of the most important components of the power system. Isolating the transformers from different faults requires an ideal balance of sensitive and selective protection functions for various applications. This seminar provides a detailed explanation on the fundamentals of transformer protection applications and their testing methodologies in the field. Various protection functions such as over current, differential, harmonic blocking, restricted earth fault are discussed in this seminar. This seminar also covers various challenges in implementing effective transformer protection such as transformation ratio, type of transformer connection, secondary current transformer connections. It also discusses the industry practices for eliminating zero sequence current elimination, CT saturation due to high inrush and over excitation conditions with ample examples.

Seminar

Integration, Protection, and Maintenance of Renewable Power Plants

3/1/18
1:15PM - 5:00PM
Ed Khan, Doble Engineering Company
Description:

The application of renewables is a topic that is attracting a lot of attention since it impacts the electric grid in several different ways. There are some positive and some negative impacts that need to recognized and solutions need to be implemented. Understanding the issues is important for different segments of the industry. It impacts utilities, companies designing such plants, manufacturers, testing companies and maintenance personnel.
With these factors in mind, this seminar is intended to describe the operation and behavior of these plants, explain the issues and lay out solutions that are being implemented. It is designed to deal with technical aspects of proper integration and efficient operation of these plants.
Hence, this four hour seminar will cover the following topics:

  1. Introduction of renewables in general
  2. General comparison with conventional power plants
  3. Short circuit contributions from wind generation (different types)
  4. Short circuit contributions from solar plants
  5. Impact of renewables on electric grid
  6. Protection applied at the plant and interfacing utility grid
  7. Issues such as islanding, frequency regulation, reactive power requirements, power flow, voltage rise, reverse power and voltage unbalance will be discussed
  8. Harmonic penetration and solutions such as harmonic filters
  9. Brief discussion of maintenance of on-shore and off-shore wind farms and solar plants
  10. Safety issues specific to these plants
Seminar

Power Quality Seminar

3/1/18
1:15PM - 5:00PM
Ross Ignall, Dranetz
Description:

 

  • Introduction to Monitoring
  • What Are We Measuring?
  • Transducer Considerations
  • Introduction to Power Monitoring

o Energy and Demand, Power Factor, Real-Apparent-Reactive Power

o Typical Utility Billing Practices

o Case Study - Energy efficient lighting

  • Going Beyond Energy and Demand to Improve Reliability

o Introduction to Power Quality

o Impact on Business Productivity Maintenance and Operating Costs

o Identifying Typical Power Quality Events (overview of sags, transients, harmonics, etc.)

o Hurricane Sandy Case Study

o Energy Efficient Lighting Case Study

  • Q & A: Your Application Questions
Seminar

Power Factor Testing of Power Transformers

3/1/18
1:15PM - 5:00PM
Keith Hill, Doble Engineering Company
Description:

This seminar will focus on the test procedures used to perform power factor tests for the following power transformers: two winding transformers (both oil filled and dry types), shielded transformers, Wye-Wye internally connected neutrals, three winding, auto transformer with tertiary, and auto transformer without tertiary. Review of excitation current test procedures for single phase, three phase delta, and three phase wye will also be reviewed. There will be questions by the speakers so audience participation is encouraged.

Seminar

Developing a Cable Fault Locating Strategy - Hands-On Workshop

3/1/18
1:15PM - 5:00PM
Tom Sandri, Shermco Industries
Description:

The mere mention of cable fault location sends shivers down many a spine. Don't lose heart-all is not lost. Remember, cable fault location-like any other craft-simply requires some basic skills, proper tools, and a sound procedure. Don't be fooled into oversimplifying the problem or solely relying on a single technique (or instrument) for every situation. Although many faults exhibit similar properties, all faults are unique-and therefore different. A fault locating technique or instrument that works well in one situation may be completely useless in another.

To use an example, a skilled golfer must be able to analyze a situation before reaching into his or her bag and selecting a club. Possessing a variety of clubs and having knowledge of their performance allows the golfer to select the most efficient tool for the job; the same is true for a skilled cable fault locator. As in diagnosing any complex problem, following a step-by-step procedure will help in arriving at the solution or in locating the fault efficiently.

During this workshop we will explore the various cable fault locations techniques, intended application and will participate in hands-on lab projects.