Page 401 - Practical Power System and Protective Relays Commissioning

Index 389

voltage test, 62 63 LD. See Logical device (LD)
Inductance (L), 69 Leakage current measurements, 104, 104f
Induction Line backup overcurrent protection, 285, 285f
inductive VT, 123 124, 124f Line differential protection testing and
motors, 250 commissioning
prestart commissioning tests, 46 47 new type line differential protection with
three-phase, 45 46 fiber optic link testing, 342 343
Infeed factor, 290 old-type pilot wire differential protection
Inrush current, 270 testing, 339 342
transformer, 270 Line protections, 66-kV, 194
Instantaneous earth fault protection, 250 Linear coupler current transformers, 114f, 115
Instantaneous high-set overcurrent protection, 250 Linear CTs, 113
Institute of Electrical and Electronics Load(s), 1 2
Engineers (IEEE), 2 angle, 41
device numbers and functions for break switches, 17, 134 135
switchgear apparatus, 2 4 current, 290, 367
Instrument transformers, 146 147 losses measurement, 62 63, 63f
CT, 147 tests, 68, 341
VT, 147 measurements, 341f
Insulation Local area network (LAN), 179, 183, 201
CB types based on insulating medium, Local backup
88 91 protection, 266 269
equivalent circuit and vector diagram, 64, relays, 266
65f Local computer unit, 141
resistance testing, 95 96, 96f,97f, 118, 130 Local control cabinet (LCC), 148, 151f
Insulators, 69 Local control center panels (LCC panels), 118
Intelligent electronic devices (IEDs), 179 Local control cubicles (LCC), 23, 130
relays, 197 201 Local printer, 141
control and monitoring IED, 199 201 Local/state/federal electrical supply company, 24
protection IED, 198 199 Lock-out of autoreclosing relay, 232
substation control system, 201 Locked rotor protection, 321 322, 322f
Interconnected mesh corners arrangement, 17, Logical device (LD), 180t
19f Logical nodes and services, 182
Interconnection diagram, 10 Loop back simulation test, 342f
Internal circuits, 196 197 Loop resistance burden test, 120, 131 132,
Internet protocol (IP), 180t, 183 132f
Interrupting rating, 85 Loss of excitation protection, 244, 245f
Interturn fault protection, 248, 248f, 249f for synchronous motors, 323
Inverse definite minimum time (IDMT), 201, Low-frequency injection method, 238, 240f
202f Low-impedance. See also High-impedance
Inverse time OC relays, 271 busbar protection, 255
IP. See Internet protocol (IP) differential protection, 279, 294 300, 295f
Isolator switch. See Disconnect switch (DS) Low-voltage (LV), 271, 361
panels, 362t, 363
protection, 323
K
Knee point voltage of CT, 105, 108f, 115, 315
M
L Machine hunting, 41
LAN. See Local area network (LAN) Machine-Human-Interface-Display (MHI),
LCC. See Local control cabinet (LCC); Local 342
control cubicles (LCC) Magnetizing current test, 119 120