Power

Field Experience with the Implementation of a new On-Line Vibro-Acoustic Diagnostic for On-Load Tap Changers

by Marc Foata, Bruno Girard, Champlain Landry, Alain Mow & Claude Rajotte.

Click following links to download PDF presentations:
1. Acoustic Diagnostic Principle
2. ABB UC Acoustic Diagnostic
3. ABB UZ Acoustic Diagnostic
4. Reinhausen Acoustic Diagnostic
5. Examples of Maintenance with Acoustic Diagnostic
6. Examples of Troubleshooting with Acoustic Diagnostic
7. Examples of Vintage/Aging Problems with Acoustic Diagnostic

Protect Personnel and Equipment from Arc Flash Incidents

Please download these videos (.wmv) to review arc flash incidents:
1. Switchgear Blast
2. Without VAMP Protection Relays
3. With VAMP Protection Relays

VAMP has developed a line of protection relays to reduce the energy released during arc flash incidents. For a brochure on these products, please contact your CD NOVA sales representative. For seminars on this product, please visit our seminar area.

Transformer Load Tap Changer Controls, parallel operation
Many plants utilize a parallel feed strategy through two transformers, often identical, to ensure uninterrupted power flow to their operations, often with the low side tie-breaker closed. This mode of operation has several considerations:

Tap Changers, if not controlled in a coordinated fashion, will eventually settle into a mode where circulating currents add unnecessary stress and losses onto the transformers. A discussion on this can be downloaded here.
Even with parallel controls, situations can arise where breaker action can destabilize circulating current or other parallel control schemes. Beckwith Electric developed the Delta Var method of parallel Tap Changer controls to expand the range of situations where parallel operation can still provide benefits. A brief discussion comparing the various parallel schemes can be downloaded here.
As power conditions change in the transmission grid, there may be reason to consider operating a parallel fed plant with the low side tie breaker open, and transfer the loads in the event of interruption on a feeder circuit. Motor Bus Transfer schemes are used in a variety of plants click here, to see a brief introduction to the concepts.

For further discussion, please contact our power team at sales@cdnova.com. Please specify your location so the appropriate representative will get back to you, or check for your local representative at this page.

Automating Older Substations without a rebuild!

Problem: How to gain information out of older substations without a major replacement of older electro-mechanical relays, or upgrading the SCADA system?
Solution: Consider the SATEC concept of Add-on to Automate. Use existing cut-outs, and existing field wiring, but gain information!

For more information click here.

Problems with Power Quality in Electrical System

Problem: Modern technology in industrial plants has "polluted" the power quality in our electrical system, requiring both capacitors for power factor correction and harmonic filters to remove unwanted harmonics. More information on the background and solution to this problem can be downloaded here.