Equipment Reliability Channel


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9:30 AM–10:15 AM 
Grounding Test Screening

Speakers: Kenneth Peterson, Hampton Tedder Technical Services

Description:

A utility client discovered some issues with ground potential rise and neutral-to-earth voltages at some of their substations. As a result of this, the utility company started upgrading substation ground grids whenever installing new transformers to ensure compliance with IEEE Standard 80. With further research completed by the utility company, it was decided that, in addition to the testing suggested in IEEE Standard 80 and 81, measurements of the Neutral-to-Earth voltage should be taken. When the neutral to earth voltage exceeds 10 volts additional stray voltage measurements are made to determine no shock hazards are present. Since 2014, Hampton Tedder Technical Services (HTTS) has been supporting this utility client in the Southwest territory with three different ground testing methods at various substations. These methods include Soil Resistivity Testing, Fall-of-Potential testing, and Neutral to Earth Voltage Measurements.

In this paper, we will be discussing the aforementioned methods in the field by HTTS at various locations throughout the southwest. This paper will showcase two substations where these methods proved unacceptable ground resistance at a particular client’s property. The client’s economical solution for corrective action will be briefly discussed to show how it resulted in successful acceptance testing per IEEE Standard 80.

10:30 AM–11:15 AM
Testing Electric Motors Using NETA Testing Standards - What You Need to Know

Speakers: Calvin Earp, Shermco Industries

Description:
Details coming soon.

11:30 AM–12:15 PM
Switch On To Fault

Speaker: Ryan McDaniel, Schweitzer Engineering Laboratories, Inc.

Description:
Details coming soon.

2:15 PM–3:00 PM
Interpretation of Online Partial Discharge Phase Resolved Patterns and Waveform Captures

Speakers: Timothy Erwin, EA Technology

Description:

Interpretation of partial discharge phase resolved patterns and waveform captures during online testing.
Online testing for partial discharge collects several different types of data including phase resolved patterns, interpretive algorithm results and waveform captures. This presentation is intended to look at phase resolved patterns and waveforms captured during PD testing to help identify partial discharge and other common signals that may be seen in the capture.

The purpose of identifying other common signals is twofold. The first is to isolate the PD waveform as a validation to other PD indicators in both cable and TEV testing. The second is to help the test technician determine if any filters will be required and determine what is the best filter range to apply. Identifying the presence of carrier frequencies, motor noise etc. is helpful in isolating the actual presence of PD quickly.  This presentation will use real world data captured from field tests.  

3:15 PM–4:00 PM
Partial Discharge Detection Using UHF

Speakers: Bill Higinbotham, EA Technology

Description:

The standard online partial discharge test modalities include TEV, Ultrasonic, and RFCT.  An up and coming technology is Ultra High Frequency or UHF radio wave detection.  

UHF radio wave detection is different and complimentary to the existing technologies.  UHF is useful in applications where the other technologies may not work well or it can provide a second confirming reading to the existing technologies.

The use of UHF detection has different advantages and disadvantages and different techniques need to be applied.  These need to be understood to properly employ this technology.  UHF detection is a new PD test modality that might be useful in the test technician's stable of capabilities.

This presentation will cover the science and technology behind UHF detection.  It will provide real world examples of PD found with UHF detection from the US, Australia, and the United Kingdom.

4:15 PM–5:00 PM
Advanced Power Factor Analysis of Transformers and Bushings

Speakers: Charles Sweetser, OMICRON electronics Corp. USA

Description:

The electric power industry is always looking for new approaches to better determine the condition of insulation systems. For decades the industry has relied on the conventional power factor test which depends on a measurement at single frequency, which can be influenced by interference, temperature, and environmental conditions. At times, only having single frequency data for review has often led to a subjective and unreliable analysis. Techniques that provide power factor measurements by varying frequency and voltage have been shown to provide additional information that better helps discriminate the characteristics of moisture, aging, temperature, contamination, oil conductivity, and the influence of external environmental conditions.

This paper will focus on the Variable Frequency Power factor (VFPF) and Power Factor Tip-Up testing methods. Based on research and practical experiences, the usefulness of methods will be described as they are applied to the dielectric properties of power transformers and bushings. Particular emphasis will focus on dielectric behavior as a function of frequency and voltage at or near the fundamental power frequency. Over the past decade, the test variations, frequency and voltage, have been performed on both new and aged insulation systems for on-site evaluation. These case studies will be discussed.