hi, is there any hand calculation method available that can roughly determine the switching overvoltage at different voltage level and its propagation in a network? I know the value can be determined via the simulation program. Any document you can refer me to will be greatly appreciated. Many...
hi, i'd like to ask a question that perhaps sound a bit stupid. i don't know why, i seem to get clogged up easily with this simple and basic stuff.
Assume a lossless transmission system connecting one single generator (on the left) to a load center (on the right). Assume a series capacitor is...
hi,
can anyone tell me how to determine the deadband of the tap changer correctly, given that the tap changer is +/- 12%, +/-6 steps (12 steps) 1%.
your help is greatly appreciated.
Many thanks
hi, due to a requirement to discharge the capacitor in between operations, the capacitor is not possible to re-use it for reactive VAR control for a period of 10 mins after the first switching in and out. Hence, the power utility claims that it does not comply to the continuous voltage control...
Hi, i wonder if anyone can tell me anywhere I can get hold of the short circuit and loading capacity of different types of power cables used for offshore wind farm. typical voltage range are 33kV, 150kV, 132kV.
look forward to hearing from you.
Many thanks,
hello, has everyone come across this type of bus duct? any information i can get? This busduct has been proposed to an offshore wind farm main transformer rated at 150/33kV. HV primary connection we use gas insulated busbar and LV connection is the duresca bus duct. I'm wondering what are the...
i have a question and hope somebody can enlighten me about an offshore wind farm with a three winding transformer(yd1d1) on the offshore platform. The client requested the star winding of the 150/33kV offshore transformer NOT to be unearthed as the system is already earthed at the onshore...
Hi,
I wonder if someone could explain me what is meant by the quasi-dynamic and quasi steady state simulation? I was reading through some papers from the internet about these and still have not been able to understand how this methodology is formed. Can we consider it a statistical approach or...
hi,
i wonder if any expert in wind turbines can help me to clear my doubts. at a very low wind speed, i understand it's sensible to disconnect the wind turbine generator (WTG) from the grid to reduce the losses. one of the papers that I have recently read about wind farm connection has however...
could someone tell me under what circumstances we need to consider cable bonding in a 132kV onshore substation? Apparently, someone was asking me this question. i have not done any project related to this and I do not want to give a false information to him, your advices will be greatly...
would the negative and zero sequence components on the generation side be affected by the grid's negative and zero sequence components when there is a fault, let's say on the common point of coupling? i thought they wont but perhaps i'm wrong. just hope someone could clarify for me.
thanks.
hi, can someone assist me with the calculation of the charging currents for an XLPE submarine cable? The idea is to supply 30MM 0.9 pf AC power to the oil & gas offshore platform which is 150km away from the shore using a 80kV 3-core 400mm2 (let's say) submarine cable. I understand this may not...
i understand the single phase system can cause the torque pulsation in motors and prime mover (generation). i dont know what exactly what torque pulsation means? How it will have impacts on the motor and prime mover. Single phase motors seems quite common and how these pulsation problem have...
