Page 394 - Practical Power System and Protective Relays Commissioning

382 Index

B Brushless excitation system, 38 39, 39f,40f
Backup protections, 266 Buchholz protection, 272 273
distance protection, 242 Buchholz relay, 50, 51f
local backup and breaker failure protection, Bus topology, 183
266 269 Busbar layouts, 10 17
primary protection zones of power system, double busbar, double breaker arrangement,
267f 14 16
remote backup protection, 266, 268f double busbar/one circuit breaker
Balanced circulating current system, 261f arrangement, 12
Balanced voltage system, 262f interconnected mesh corners arrangement,
Bar primary type CT, 112 17
Batteries, 157 one and half breaker arrangement, 13 14
acid concentration, 158 ring busbar arrangement, 13
additional checks, 158 sectioning of busbar arrangement, 13
charger, 160 single busbar arrangement, 11
Busbar protection, 251 252, 254f
etting modes during battery charging,
high-impedance circulating current
160 161
protection, 252
charger commissioning tests
IED, 199
electrical tests, 30
settings, 313
visual checks, 30
breaker failure protection, 319
charging and discharging, 159 160
two-section busbar with feeders and
commissioning tests
electrical tests, 30 incomers, 314f
visual check, 30 worked examples, 313 319
DC power circuits, 157 testing and commissioning
determining battery condition, 158 primary injection stability test, 351 355
in high-voltage substations, 161 162 secondary injection tests, 350 351
measurements, 159 Busbar protection. See Switchgear protection
power sources, 157 Busbars, 143, 251
safety considerations, 158 arrangement sectioning, 13, 16f
specific gravity and acid concentration, 158 blocking scheme, 254f
Bay level substation, 181 differential protection, 368
Bearing failure protection, 250 251 synchronizing of synchronous generator
BF. See Breaker failure (BF) with, 41 42
Biased differential relay, 312 Buses, 2
Biomass energy, 34 Bushing-type CT, 112
Bipolar links, 80 81, 81f
Blind spots protection, 230 231 C
Blind zone, 287
Cable
Blocking
capacitance test, 75, 75f
overreach transfer scheme, 225 226, 226f
connection in GIS, 147, 149f
voltage test, 358
insulation resistance test, 75, 75f
Boost charging, 161
phase conductors, 73
Breaker failure (BF), 199
positive sequence impedance
module test, 350
measurements, 76, 77f
protection, 266 269, 319
zero sequence impedance measurements,
worked example for, 319 320
76, 77f
relay
Capacitance (C), 64 66, 69
connection on overhead transmission
Capacitive current, 64 65
line, 319f
Capacitor voltage transformer (CVT), 126
operation logic, 320f
circuit, 127f
scheme, 269f
equivalent circuit, 127f
time and total fault clearance time, 320f
principle of operation, 126