This is an scheme of LCP (Local Control Panel) in DG SET. Here the controller gets input from AMF panel. I was just wondering what is difference between DG Crank & DG Run relay R1 & R2 (just asking in general about the sequence of operation).
As I have read a DC supply from battery needs to...
Hello,
As you can see above is an electrical diagram of Bus PT for 11kV Bus. I have a question that if the primary winding of PT is Star Connected with Neutral point earthed, then why does it not carry extremely high current when connected to 11kV? (Ex. I = (11kV - Vn)/ Zwinding as per KVL)...
Hi all,
I was wondering does the insulation resistance value change with applied voltage?
For ex. lets say if I have an equipment and I test it with 2.5kV and get X value of IR. Does this value change if I conduct the same test with 5kV?
Best!
Chris
Hello all,
Lately been struggling to get the answers to these questions,
Q.1 Does phase sequence/ phase shift in input AC supply affect rectified DC output in fully controlled rectifier?
Q.2 How does the triggering angle of rectifier change automatically in a practical fully controlled...
Dear all,
The types of sheath bonding that are generally used for Cables is (a) Single Point (b) Both Point Bonding or (c) Cross-Bonding
But as we know that generally when using Single Point or Mid Point Bonding we provide with the SVL to limit the sheath voltage. What is the requirement of...
Dear all,
Generally we use Copper Screens/Copper Tape in XLPE Insulated Cables to meet the fault current. Can it be replaced with Aluminium Screen?
By screening I mean round wire of Aluminium since for 1C Cables we already use Al Armour. So why not use it for screening purpose in 1C and 3C...
Dear friends,
Is there any relevant IEC or other standards clause that discusses the suitability of EHV Cables for high altitude?
Laying Conditions: Underground
Altitude: > 1000 m
Cable: XLPE Insulated 220 KV, 1200 sq.mm - Unarmored Cu Cable (2XLyC2Y)- which is Copper Conductor, XLPE...
Hello Everyone,
Someone asked me to perform Heat Load Calculation for Power Cables. As Electrical Engineer we always do the I^2.R Calculation. But how do we calculate HVAC (Heating, Ventilation, Air Conditioning.
Question Asked :
Also when I performed the loss calculation is for Per...
Dear Friends,
We are supplying a 400 SQ.MM Bare Copper Conductor (Hard Drawn - HDCC) for Customer Substation Application for Busbars and Jumper Connection. Any idea how to get this data? I think PLS - CADD has similar interface.
Thanks
Chris
Hello,
Cable Laid, Energized but No-Load Condition. How could the Armour even get damaged in such condition? Looks like some sparking took place? But how does spark take place in cable brackets in No-Load Condition (Just Energized). Induced Voltages will be only due to No-Load Current which...
Hello Everyone,
Generally in Underground Electric Cable, Lead Sheathing is provided over the Copper Wire Screen. Instead of Copper Wires why can't we use Aluminum Wires and provide Lead Sheath over it?
https://blog.samtec.com/post/dissimilar-metals-in-mating-connectors/
According to this...
Hello Everyone,
We currently use Glass Fiber Tape over the Armouring (in Cables) for Flammability Test Requirement as Per IEC: 60332. I was just wondering if there are other such tapes which maybe flame retardant, combustion free. I just want to compare their properties.
Thanks
Chris
Hello Dear Friends,
As the title suggests i am looking for Non-Magnetic Metallic Material For 1-Core Power Cable Armouring. Generally Aluminum is preferred for it, but Al suffers from oxidation problems and corrodes in some environmental conditions. I have researched Austenitic Stainless Steel...
Hello Dear Friends,
As the title suggests i am looking for Non-Magnetic Metallic Material For 1-Core Power Cable Armouring. Generally Aluminum is preferred for it, but Al suffers from oxidation problems and corrodes in some environmental conditions. I have researched Austenitic Stainless...
