I have a transformer 115/11.5kV controlled secondary voltage between 0.97 and 1.03 Tap setting max 1.1 and min 0.9, tap size = 0.00606.
I am having troubles setting the tap size? Which field is that? and the setting for the current tap? Which field is this?
I would appreciate instructions what is the PSS/E input record for modeling the OLTC. How to obtain the resultant current tap setting after running the loadflow?
In addition to @acd1's answer I want to clarify that the number of steps are:
Nsteps = (Rmax-Rmin))/STEP = (1.1-0.9)/0.00606060606 = 33.
The number of tap changer positions are always Nsteps+1, i.e. NPOS = 33+1 = 34 in this case. Normally, the number of positions are odd numbers so there may be something wrong with the given data here. With 33 tap positions the steps size would be: STEP = 0.2/(33-1) = 0.00625!
You are correct - my calculation (and I believe the poster's data) misrepresent the situation. The number of tap positions is different from the number of steps (= taps - 1). 33 tap positions, or 32 steps of 0.625%, are very typical of LTCs.
Hi! If “550kV/220kV+-2*2.5%/66kV" is the only information for an auto transformer, what is the tap range and tap step? And how do I calculate the Tap Position in PSS/E? Thx!
For 220 kV winding: Rmax=1.05 pu, Rmin=0.95 pu, Tap positions=5. Winding I/O code=3.
Thank you for ur help. But in PSSE, the other two windings also need to be filled with the tap position for a three-winding transformer, what should I fill in and how to change the tap position for 220kV winding?
Enter Winding Nominal voltage in kV for all three windings. Enter Winding Ratio = 1 for all windings..Ratio for 220 kV winding may have values 0.95, 0.975, 1.0, 1.025 or 1.05 depending on the tap changer position.
The tap size is actually controlled via the "Tap Positions" field. So with a tap range of 0.9 ~ 1.1, you have a range of 0.2. With each tap step of 0.00606, the number of tap positions is 0.2 / 0.00606 which is 33.
The current tap setting will either be "Winding 1 Ratio (pu)" or "Winding 2 Ratio (pu)" depending on your control settings. You can also use the "xfrdat" routine from the psspy API to programatically retrieve the tap ratio for two winding transformers.
Here is a series of batch commands to add a 2-winding zero-impedance transformer between a hypothetical bus 1 and bus 2, as generated by PSSE. The winding 2 ratio is one tap off the nominal ratio, at 1.00606.
BAT_TWO_WINDING_DATA_6,1,2,'1',1,1,1,0,0,0,33,0,1,0,0,1,0,1,1,1,0.0, 0.0001, 100.0, 1.0,0.0,0.0, 1.0,0.0, 1.0, 1.0, 1.0, 1.0,0.0,0.0, 1.1, 0.9, 1.1, 0.9,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0," ",
BAT_TWO_WINDING_CHNG_6,1,2,'1',,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,;
BAT_TWO_WINDING_CHNG_6,1,2,'1',,,,,,,,,,2,,,,,,,,,,,,, 1.00606,,,,,,,,,, 1.03, 0.97,,,,,,,,,,,,,,,,,,;
Asked: Jan 24 '3
Seen: 1,500 times
Last updated: Jan 24 '23
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