Page 396 - Practical Power System and Protective Relays Commissioning

384 Index

Commissioning (Continued) protection current transformer accuracy
protection scheme function test, 326 classes, 109 110
secondary injection tests, 325 326 advantages of optical instruments, 116 118
Common data class (CDC), 182 air-gapped, 112
Communication, 183 bar primary type, 112
in IEC 61850 bushing-type, 112
protocols, 179 commissioning testing
field, 180t commissioning electrical tests, 25 26,
system, 201 118 121
Compensation factor, 291 visual checks, 25, 118
Compressor oil, 91 connections, 115
Conductors, 69 equivalent circuit, 105
Confidentiality, 184 gas GIS, 147f
Connection or wiring diagram, 9 10 knee point, 115
Conservator or expansion tank, 49 linear coupler, 114f, 115
Contact resistance testing, 94 95, 95f magnetization curve, 105 108, 316, 316f
Contaminants, 90 OCT and OVT, 115 118
Contamination, testing for supervision test, 355
gaseous byproducts, 91 transient performance, 113 115
moisture content, 91 wound primary type, 112
oxygen content, 91 Cut-off circuit, 92
Continuity CVT. See Capacitor voltage transformer
check, 72, 73f (CVT)
of secondary circuits test, 121
Control and monitoring IED, 199 201
Control system of GIS, 148 149 D
Corona effect, 69 Damper winding thermal protection, 251
Cross bonding test verification of metallic DAR. See Delay autoreclosing (DAR)
sheath of cable, 76 Data acquisition units, 141
Cross-linked polyethylene (XLPE), 71 Dead time
CT. See Current transformer (CT) of autoreclosing relay, 232
Current. See also Alternative current (AC); of CB, 232
Direct current (DC) Defective bearing, 250 251
capacitive, 64 65 Definite time philosophy, 201, 202f
discrimination by, 203 204 Definite time relays (DT relays), 190
inrush, 270 Delay autoreclosing (DAR), 232
interposing “auxiliary” transformer for, 298, Delta star power transformer differential
298f protection, 272 273
load, 290, 367 Delta-connected current transformers, 115,
no-load, 62, 63f 116f
ratings, 85 Density monitor checks, 91
total, 64 65 Dependability, 192
voltage test, 62 63 Differential angular pickup test, 357
Current transformer (CT), 105, 106f, 111f, Differential frequency pickup test, 357
143, 147, 190, 282, 326, 366 367. Differential protection, 236, 250, 273 275.
See also Voltage transformers (VT) See also Overcurrent protection (OC
accuracy classes protection)
circuit transformer open circuited application, 262
secondary winding, 111 auto-transformer differential protection,
metering current transformer accuracy 274 275
classes, 109 earthing transformer protection, 275