Strength Training and Coordination: An Integrative Approach
Notes on Coordination Compounds(can be used till AIEEE level, but I have not added organometallics and salts like Zeise's salt/Mohr's Salt etc) best used at board level. Do rate!
Ptotection
sdf
Full description
Full description
creative interdependence grooves
Full description
insulation coordination with respect to power system is breifly explained here.all the components in power system are covered
IDMT RELAY CO-ORDINATION
By Y. k. Pandharipande.
IDMT RELAY CO-ORDINATION
IDMT RELAY CO-ORDINATION
Rated Current = 87.5 A (66KV) / 525 A (11KV) S.C. Current for Fault on LV side (assuming infinite source) = Rated Current x 100 / % Zt = 525 x 100 / 10 = 5250 A (11 KV side) = 87.5 x 100 / 10 = 875A (66 KV side) IDMT Relay with Normal Inverse Characteristic (IEC) 0.02 Operating time (t) = (0.14 / ( I - 1) ) x TMS where I = Plug Setting Multiplier (PSM) t @ PSM 10 / TMS 1.0 = 3.0 S t @ PSM 20 / TMS 1.0 = 2.2 S t @ PSM 8.75 / TMS 1.0 = 3.16 S.
O/C Setting = 1A (100A), PSM = 875 / 100 = 8.75 DOT = 0.82 + 0.30 = 1.12S Operating time @ PSM 8.75 / TMS 1.0 = 3.16S TMS to achieve DOT of 1.12S = 1.12 / 3.16 = 0.35 Note : 1. Grading between Relay R3 & R4 is optional since it does not affect down-stream co-ordination. If foregone, identical TMS can be adopted for Relay R4 (TMS 0.26) with similar response time of 0.82S as relay R3. This would reduce the up-stream fault clearance time. 2. Grading margin of 0.3S is used in this example considering EM IDMT relays. With Numerical relays, grading margin can be reduced to 0.2S, in view of reduced timing errors and no overshoot.
