Dear all,
I would like to seek reason why the following test must be conducted with acceptance criteria,
i) partial discharge,
ii) high voltage at 66.5kV (AC) for 5 min,
iii) Sheath HV (DC) test, 25kV (1min),
iV) Hot set test,
From i understand,
i) to ensure minimum current losses,
ii)...
Dear all,
Normally, as switchyard/ primary designer, how do you guys select the number of spacers for connecting the gantry and also for between equipments.
My second question, what's the static tension force for conductor for connecting in between the conductors.
Do share any IEC standards...
I would like to know too, perhaps when capacitor can store extra energy of the fault/lightning strike current flow through then surge arrester can dispitate energy safely.
Hi guys,
I would like to have everyone input for the following items;
1) What is the Form 4 Type 2 ?
2) In general practice, how should design consider in terms of putting the "KWH meter", "Ammeter", "Voltmeter" , "Earth Fault Relay" , "Over-current Relay", "Heater" ?
3) Is it a must to put...
The designer actually design this UVR for MCCB which has timer close time which quite same as rcwilson said above.
As for DRWeigh's statement "to prevent 3-phase motors from running single-phase, or attempting to start single-phase"
From the control schematic, it only shows the source from 110...
ScottyUK,
Appreciate for your sharing input.
prc,
I'm wating for prc reply on regard minimum protection. Does it give minimum protection for power transformer or for OLTC itself ?
ScottyUK,
You mention lifting frame / gantry, do you mean provide on the transformer or OLTC itself ?
Well, honestly, I havent see any high voltage power transformers myself.
Do you agree what prc stated in his reply on "Once upon a time almost all leading transformer manufacturers were...
prc,
I would like to seek clarification on regards your suggested few points;
i) Guaranteed number of operations before overhaul, overhaul means maintenance as I suppose ?
ii) Bursting plate,surge relay, out of step relay, what is that ? kind new terms for me.
ScottyUK,
Your utilities prefer...
Dear all,
I would like to seek opinion how you guys review the submission approval for transformer accessories transformer - OLTC.
As far as I know, substation here, they prefered MR Germany - OLTC.
Does virtual front time mean surge arrester can absorb the current for certain period ?
Whereby half-value of tail mean surge arrester take certain period of time to discharge the current energy into half.
Guys,
I would like to seek clarification what is current wave (30/60 us - slow-front/switching), (8/20 us- fast-front/lightning), 1/(2-20 - steep-front)us
Guys,
How you guys calculate value for Tpi which is parameter for calculating Pinch Force (Fpi), the factor V2.
As I know, V2 value can be get it directly by referring figure. But I would like to know the equation for calculating Tpi.
Guys,
Anyone here have come across Newton Raphson Method to solve polynomial equations for upto X^3 in the excel spreadsheet.
Mind to share the tutorial or precise example.
