Protection Engineering Basics and Schemes Protection Engineering | Page 7

8.2 Terms Use in Auto reclosure schemes: ........................................................................................... 251
8.3 What we mean by auto reclosure in any circuit? ........................................................................... 253
8.3.1 Auto reclosure relay and auto reclosure breaker .................................................................... 253
8.3.2 Auto reclosure breaker with microcontroller .......................................................................... 254
8.3.3 Training on Auto Reclosure: ..................................................................................................... 255
8.4 Testing method: .............................................................................................................................. 258
8.5 Auto reclosure at field .................................................................................................................... 263
8.6 How to Test auto reclosure at Site: ................................................................................................ 263
Chapter 9 Motor Protection ................................................................................................................... 266
9.1 Abnormal condition ........................................................................................................................ 267
9.2 line interrupting Device .................................................................................................................. 267
9.2.1 Magnetic Contactor ................................................................................................................. 267
9.2.2 E1 Medium Voltage Motor Controller ..................................................................................... 268
9.2.3 E2 Medium Voltage Motor Controller ..................................................................................... 268
9.3 Types of Switchgear Control ........................................................................................................... 268
9.3.1 Low Voltage rating motors up to 100KW ................................................................................. 269
9.3.2 Low Voltage rating motors beyond 100KW ............................................................................. 269
9.3.3 High Voltage rating motors ...................................................................................................... 269
9.4 Overload Protection. ...................................................................................................................... 271
9.4.1 Inserting Setting in Relay ......................................................................................................... 274
9.5 Locked Rotor Protection ................................................................................................................. 277
9.6 Short circuit Protection ................................................................................................................... 278
9.7 Negative sequence Protection ........................................................................................................ 279
9.8 Differential Protection .................................................................................................................... 281
9.9 Stalling of Motor ............................................................................................................................. 281
Bibliography .............................................................................................................................................. 283
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