Psse

[KRIZZ]

Please i need to change the length of a transmission line (branch) unit in PSSE to Km(kilometers) i cant find where to change the default unit. Can someone please help me out.

[ionioni]

noise

[surgeArrester]

Please i need to change the length of a transmission line (branch) unit in PSSE to Km(kilometers) i cant find where to change the default unit. Can someone please help me out.

read the manual, i guess?

[PemulA]

you work (normally) using per-unit values for the line parameters (for eg. ohms/mile or ohms/km) and the length is in user-units (is up to you if one unit of length means 1 km or 1 inch or whatever), ofc your pu values must be entered accordingly (have you seen in pss/e miles as a unit?)

Following is taken from POM of PSSE

R Branch resistance; entered in pu. A value of R must be entered for each branch.
X Branch reactance; entered in pu. A non-zero value of X must be entered for each
branch. Refer to Zero Impedance Lines for details on the treatment of branches as
zero impedance lines.
B Total branch charging susceptance; entered in pu. B = 0.0 by default.

[surgeArrester]

Hahaha from manual?


Sent from Mars

[BabyBear]

If you have the single line diagram, try to double click on the subject transmission line. A window will pop out and you will be able to change the length from the that window. Please let me know if you did it correct.

[ionioni]

noise

[BabyBear]

To be honest, that length of line entered in the window has nothing to do with the per unit values of R, C, and L. So, program behaves that whenever you enter values of R, L, and C, it treats it as lump values. The transmission length there has nothing to do with some internal calculation. its just for reference.

[KRIZZ]

To be honest, that length of line entered in the window has nothing to do with the per unit values of R, C, and L. So, program behaves that whenever you enter values of R, L, and C, it treats it as lump values. The transmission length there has nothing to do with some internal calculation. its just for reference.

Thanks BabyBear, in think what you said is true i entered the length of the lines and i cant find its effect on the xmission line losses.