Ask Your Question
0

THR, current threshold (pu sbase)

asked 2024-11-11 06:55:43 -0500

anonymous user

Anonymous

This is the CONS model of TIOCR1 line relay, can anyone show the exact calculation for this threshold value? And what is the difference between THR, current threshold (pu sbase) and lowest operating current (multiple of pickup.)

edit retag flag offensive close merge delete

1 answer

Sort by ยป oldest newest most voted
0

answered 2024-11-11 11:47:12 -0500

perolofl gravatar image

See Program Application Guide, Volume II, Chapter Model TIOCR1.

THR is given in pu current. Inverse time current points (five points) are given in pu of THR, i.e. current values shall be increasing and > 1. Corresponding time values shall be decreasing.

edit flag offensive delete link more

Comments

I have already seen the chapter but could not find the exact calculation. In my .dyr file the current threshold is given as 6.7. I am just curious how this value is being calculated?

junaid2657@gmail.com gravatar imagejunaid2657@gmail.com ( 2024-11-12 01:35:54 -0500 )edit

Current base, Ibase, is Sbase/Vbase/sqrt(3) kA. Ipu = IkA/Ibase. With 100 MVA base and 230 kV the current base is 0.251 kA. 2.5 kA = 2.5/0.251 = 9.96 pu.

perolofl gravatar imageperolofl ( 2024-11-13 05:25:36 -0500 )edit

Thank you, much appreciated.

junaid2657@gmail.com gravatar imagejunaid2657@gmail.com ( 2024-11-13 05:46:49 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

[hide preview]

Question Tools

1 follower

Stats

Asked: 2024-11-11 06:55:43 -0500

Seen: 128 times

Last updated: Nov 11