Recent content by KLG

Hello. I am looking for some help witht the description of Power Transformer cooling type designations. I am looking at two transformers with similiar characteristics. The first is a 115 KVA 3 phase transformer with the following MVA and cooling designations: 15/20/25 MVA (oil filled with...

My preference for installation will be in the summer months. In all likelyhood, the cable will be both aerial from a pole line to cable tray or messenger cable. The temperature varies from 25C to -50C for this installation (with very long terms of -50C), a very harsh environment. The idea of...

Thank-you very much gentlemen.

Please confirm if the following statements are true. I would like to operate a 380Vac 3ph 50Hz 1500rpm motor on a 440Vac 3ph 60Hz supply. I believe that this motor wil run on the 60Hz system at a lower current (20%?) and at higher speed 1800rpm (neglecting slip). The control power transformer...

Thanks for the information guys. I have talked to the local Anixter rep and he has given me the following information. ALTOS Low Temperature Cable with an Operational temperature range of -55C to 70C (-67 to 158F). There is no mention of an installation temperature, but I will make the client...

I am looking for a temperature range specification for fibre optic cable. I wish to use fibre optics in a -50C environment. I am concerned that this low temperature will effect signal propagation in the core. Will the fibre become brittle and cracks form? As for the rest of the equipment, it...

You were right drmelk (Materials), we are using 6.6 nylon. After some investigation I found two materials that may stand up to chlorine. It is a Fluroopolymer, market names TEFZEL or HALAR. I will be performing a trial run using these materials in our Chemical conversion operations. Thanks...

I work in a Kraft (caustic) pulp mill. We use plastic tie-wraps to secure electrical cable to cable tray in our bleach plant area. The bleach plant area has a very corrosive atmosphere. Plastic tie-wraps have a tendency to only last about 4 years in this atmosphere. Plastic is very...

Thanks jbartos for your reply. To furthur the question; what is the rule of thumb on loss (or possible gain) in motor efficiency when a motor has sustained stator damage (short) and is rewound? I know the answer is dependant on a lot of factors particular to material quality in the construction...

Where is the best place to find information on "AC Motor Efficiencies" with respect to rewinding the stator? Does anyone have any information to share on the topic of rewinding a motor verus replacemnt?