Recent content by ssantoshr

Here is a good reference document for proper cable installation of Ground Sensor CT (Core Balance CT). http://w3.usa.siemens.com/us/internet-dms/btlv/PowerDistributionComm/PowerDistribution/docs_MV/TechTopics/ANSI_MV_TechTopics50_EN.pdf

Below are some manufacturers who offer the ground sensor CT (zero sequence CT). GE/ITI, Link ABB, Link Schneider Electric, Link

I have attached a list of typical standards applied to relays. You should be able to find the testing standards for any relay in its instruction manual.http://files.engineering.com/getfile.aspx?folder=542ab9ff-8239-44b0-8d7a-7d87ac06a8c7&file=750_Relay.pdf

The OS (oil submersible)and Shorty (technically called as OS Shorty)are backup type current limiting fuses. However OS Shorty fuses are newly designed which are smaller in size and allows easy installation. The link column is not a fuse. It is the type of fuse coordination curve. Say for...

Main reason for ferroresonance during normal switching operation is due to unloading conditions. The ferroresonance phenomenon could be possible when the PTs are connected WYE grounded on an ungrounded or high resistance grounded systems. I have read some cases where ferroresonance produced high...

Here is the paper that has some case studies on ferroresonancehttp://files.engineering.com/getfile.aspx?folder=832a9bcd-8af1-4ebd-9d60-7122fba36c44&file=FERRORESONANCE_8_case_studies.pdf

Some transformers are subject to sudden pressure relay operation due to mechanical forces on the transformer during system faults when no electrical fault is present inside the transformer tank. This can be due to winding shift and subsequent oil movement, or it can be due the location of the...

Refer to chapter 3 of the IEEE Std 141 (Red Book) for voltage considerations.

Ferroresonance occurring on single phase are very rare but I have read some cases where the ferroresonance situation occurred on single phase transformer (240/120V). The transformer was in series resonance with the cable capacitance. Ferroresonance can occur in a series inductive (transformer) -...

Solid grounding system is most preferable on a three phase four wire system. However solid grounding system presents problems with coordination and reliability. High resistance grounding provides safer, reliable and economic system. HRG is preferred for continuous process industries and limits...

If the surge arrestor is built into the transformer, it is required to determine if additional surge protection is needed on the secondary. This will depend on the size and importance of the transformer and also the cost and type of arrester. You seems to be using distribution class arrester...

Below are the list of books which I think are best suited for electrical power exam. - Power System Analysis by Grainger and Stevenson - Electrical machines, drives and power systems by Theodore Wildi - NEC, NFPA 70 - Handbook of Electric Power Calculations by H. Wayne Beaty - NCEES study...

Thank you all for your valuable advice.

Hi dpc, Thank you for your response The secondary current would come to 1000VA/120V = 8.33A But..PTs are used to measure and monitor voltages. I have not known about supplying power to any circuits until this project i am doing right now. If PTs could generate current, then what could be the...

This is a medium voltage switchgear application and my question is "the potential transformer (PT) supplying power to a breaker control circuit". Potential Transformer details: Catalog# PTG5-2-110-1322FF Primary: 13200V Secondary: 120V Click on the link below for the cutsheets...