Thursday

Morning Seminar

Title: Exploring the Techniques and Philosophies of Testing Electrical Insulation

3/2/17
8:00AM - 11:45PM
Presenter: Tom Sandri, Shermco Industries
Description:

Abstract - This seminar will explore the various techniques and philosophies of insulation testing on electrical equipment and assets. Ranging from the most basic under-voltage tests performed with a megohmmeter to the more advanced diagnostic tests of Power Factor / Dissipation Factor and Partial Discharge; we will discuss the theory behind the technique, the intended purpose of the test, appropriate applications, interpreting and analyzing results, and limitations of the technique. We will also review the various power supplies used to deliver test voltage along with the advantage and limitation of the power supply. This will include: power frequency testing (50/60 Hz), very low frequency testing (VLF), oscillating wave and direct current (DC). Electrical equipment discussed will range from switchgear, circuit breakers, rotating equipment, transformers, and cables.

Morning Seminar

Title: Ground Fault Testing per ANSI/NETA ATS and MTS

3/2/17
8:00AM - 11:45AM
Presenter: Tim Reed, Electrical Reliability Services
Description:

Abstract - 4 hour Seminar on ground fault testing per ATS/MTS including the following topics:

  • NEC 230-95 AND 517-17GFP
  • GFCI VS GFP THEORY
  • External and internal (integral) systems
  • Inspection
  • Testing
  • Time coordinated vs zone interlock
  • Theory and testing and tips
Morning Seminar

Title: Mechanical Condition Assessment of Transformers Using Sweep Frequency Response Analysis

3/2/17
8:00AM - 11:45AM
Presenter: Dinesh Chhajer and Robert Foster, Megger
Description:

Abstract - Sweep Frequency Response Analysis (SFRA) is a sensitive diagnostic technique used to locate internal mechanical damages such as winding displacement, core movement, broken clamping structures, radial and axial deformation, shorted turns and other winding failures. By performing a series of frequency sweeps on the transformer and comparing the results to an original fingerprint, a detailed assessment of the mechanical condition of the transformer can be made, focusing on core, windings, taps, and connections. Although SFRA has evolved a lot from its initial days, technicians out in the field still run into challenges when trying to identify how much deviation is acceptable and what should be considered as a trigger point for additional tests and further investigation.

This seminar will cover SFRA test requirements, measurement methodology, results interpretation and analysis. It will focus on SFRA diagnostic technique as a tool to identify transformer failure modes. Failure mode guidelines included in the IEEE and CIGRE guide to identify mechanical issues will be reviewed in detail and will be compared with real life cases from field experience. It will also provide recommendations on best practices to be considered while performing the SFRA test in a field environment to minimize outside influences on the measurements. Factors such as effect of tap changer position, test voltage and ground techniques will be highlighted. Recommendations will also cover the differences between commissioning, routine maintenance and troubleshooting SFRA tests. The final part of the seminar will include case studies from major utilities that used the SFRA technique to identify mechanical issues and took preventive actions to avoid catastrophic failure of power transformers.

After attending the seminar, the audience will have a sound understanding of SFRA along with the best practices for performing the test and interpreting the results.

Afternoon Seminar

Title: Advanced Ground Testing Concepts and Techniques

3/2/17
1:15PM - 5:00PM
Presenter: John Humphrey and Hilton Mills, Hood-Patterson and Dewar
Description:

Abstract - In today’s ever crowded and complex infrastructure environment, performing ground impedance measurements has become more difficult. This paper will discuss the details required to properly perform these measurements using traditional methods and equipment, as well as highlight the difficulties involved with obtaining accurate results. Additionally, this paper will introduce the newer Computer Based Test Instrument (CBTI) method specified in IEEE Standard 81-2012 and illustrate some of its benefits and drawbacks. Comparisons will be made between the traditional fall of potential method and new CBTI method. The main focus of this paper will be to increase the test engineer’s knowledge of all available grounding test methods and proper procedures when performing grounding impedance testing.

Afternoon Seminar

Title: Advanced Test Techniques for Generator and Transformer Protection

3/2/17
1:15PM - 5:00PM
Presenter: Steve Turner, Beckwith Electric Co., Inc.
Description:

Abstract - This seminar demonstrates how to commission specific protection functions using COMTRADE (Common format for Transient Data Exchange). The following are required to generate a specific test:

  • Detailed Test Plan
  • COMTRADE records

Each detailed test plan should provide a complete explanation of the test as well as thorough instructions on performing the test using a step-by-step process. Each detailed test plan should also provide an explanation as to why the test is useful to perform such as preventing a common type of misoperation from re-occurring; for example, transformer differential protection tripping during energization due to inrush current. Some functional tests may only require a COMTRADE record to inject test signals into the relay. Tests that can be performed using a generic COMTRADE record greatly simplify the test plan and can provide test results based upon actual system conditions.

The purpose of the seminar is to demonstrate how to use COMTRADE records to test protective relays. COMTRADE records that have been captured by numerical relays and digital fault records during actual system events are of particular interest since these provide the ability to test protection for critical faults or disturbances such as an out-of-step condition that are difficult to create using off-the-shelf test set software. Utilities and other customers can build a library of test cases.

The following detailed test plans are demonstrated:

  • Transformer Differential Operation during Energization
  • Loss of Field Generator Protection Operation
  • Out of Step Generator Protection Simulation An automated test plan for testing the operating characteristic for differential protection is demonstrated as well.
Afternoon Seminar

Exploring Ohmic Trending of Battery Systems and Battery Capacity Testing – What Do These Tests Tell Me? Which One Should I Use?

3/2/17
1:15PM - 5:00PM
Presenter: Tom Sandri, Shermco Industries
Description:

Abstract - If reliability is the true goal, is important to recognize that various parameters play an important part in maintenance of cells for optimal battery performance. This includes visual inspections. The manufacturer’s instruction set for installation and maintenance should be completely understood and followed. Documenting voltage, temperature, connection resistance, and battery charger voltage measured at the battery terminals, and specific gravity and/or float current when appropriate all play a part in helping to understand a battery’s state of health.

For many it is believed that the only proven method to determine battery health is via a capacity test and the subject of using ohmic readings to reliably determine state of health is controversial in the field of stationary battery maintenance. This seminar will delve into these maintenance practices and will explore the merits of each test along with an explanation of the theory behind the test and how to manage data obtained.