Log InBecome a Member
Log InBecome a Member

Search results

Events

Research

Selected Filters

No filters selected.

Interest Group

Viewing 70 - 80 of 203
Sort By
Relevance

Research

3038: Vibro-Acoustic Tap Changer Diagnostic Demonstration

Transformers equipped with on-load tap changers (OLTC’s) are historically less reliable than transformers which are not equipped with this component. International investigations and data from Hydro-Québec-TransÉnergie unanimously confirm that the element most often implicated in major failures of power transformers is the OLTC. Until recently there were few tools for the diagnosis of OLTC’s and these only detected a small proportion of the failure modes. The need for a
Jan 1, 2009

SE

Research

30130: Design Guide for Station EMI Protection

This document provides guidance for the development of substation designs for EMI immunity. It reviews the various categories of EMI sources, namely:Unintentional electromagnetic interference (EMI)Conducted noise from switching transients or lightning surgesGeomagnetic disturbance (GMD)Intentional electromagnetic interference (IEMI)High-altitude electromagnetic pulse (HEMP)Their manifestations and appropriate mitigation techniques are described. Appropriate design and application standards are d
Apr 6, 2018 - Jun 5, 2019

SE

Research

3035: Power Apparatus Bushing Condition Assessment and Diagnostics

Bushing failures are responsible for a large number of costly forced outages of transformers, breakers and reactors. Almost half of the bushing failures are catastrophic in nature. Many diagnostic techniques are available for assessing the insulation condition of oil-paper insulated equipment in general and bushings in particular. However, no single technique seems to work all the time. Some techniques are too costly for implementation on a large scale. What is needed is a combination of ef
Jun 1, 2006

SE

Research

3012: Application of the Recovery Voltage Method for the Condition Assessment of Power Transformers

A test system, consisting of a test chamber and a conditioning chamber to hold oil and coilsamples, was built at Powertech Labs to carry out recovery voltage measurements (RVM). Acomputer controlled test system for recovery voltage measurement, which had been alreadyconstructed at Powertech Labs, was installed to measure and monitor the response voltage,temperature, and moisture content inside the test chamber. Experiments were performed onnaphthenic and paraffinic transformer oils, on bare-wire
Aug 1, 2003

SE

Research

3080: Total Ownership Costs Review

Purchasing equipment based on the lowest initial cost may not always be the most economical choice when all costs associated with a particular piece of equipment are considered in the evaluation. This report identifies all costs associated with owning a piece of equipment. When all the costs are taken into consideration, the final analysis provides a dollar value (at net present value) representing the amount of money (projected asset ownership costs) the Purchaser must have in the bank today to
Mar 23, 2012 - Mar 1, 2014

SE

Research

3007: Condition Monitoring Of Circuit Breakers By Oil Analysis

This study was undertaken to determine the merits of oil analysis for condition monitoring and diagnostics of circuit breakers. Oil samples withdrawn from a selected number of in-service circuit breakers were sent to the lab for comprehensive analysis. Test results, along with equipment information, were collected into a relational database and analyzed for trends and correlation. An algorithm was developed utilizing oil test results to assign an equipment condition code from 1 (good) to 4 (unsa
Jan 1, 2003

SE

Research

3049: Electrical Protection of Telephone Cables Serving Substations

Telephone lines that serve substations must be protected from the currents and voltages generatedduring faults. The main communication service providers (CSPs) in Canada (e.g. Bell, TELUS andothers) use the recommendations in IEEE Std 487 to determine the type of protection required.Protection principles are based on the concepts of ground potential rise (GPR) and zone ofinfluence (ZOI) described in IEEE Std 487. The validity of the ZOI concept when telephone cablesshare the same structures as d
Nov 1, 2008

SE

Research

3737: Practices for Shielding and Grounding of Station Control and Power Cables

Aug 24, 2022

GL

SE

Research

30105: CPF: Online Monitoring Equipment for Substation Apparatus: State-of-the-Art Review

This project consisted of a state of art review of on-line monitoring equipment for outdoor substation apparatus that will be useful for implementation of equipment on-line monitoring by utility field personnel and their vendors. The project scope included a literature review of available technical and field application information to establish a basis from which to work with regards to this investigation.Service experience was obtained by undertaking a technical survey of utilities presently em
Apr 4, 2018 - Jul 29, 2019

SE

Research

30139: Condition Monitoring Methodologies, Tools and Practices

This report describes approaches being taken by utilities worldwide in the area of online condition monitoring for major substation assets such as power transformers, circuit breakers, and station batteries. The report provides the results of an extensive literature search, the results of a user survey, a high-level functional specification, and a business case approach for the implementation of online condition monitoring systems.The report reaches some conclusions on the current “state-o
Feb 1, 2022 - Sep 12, 2022

SE

8 of 21
Viewing 70 - 80 of 203
Back to Top

Selected Filters

No filters selected.

Interest Group