7.2.3 Sensitive Overvoltage Blocking Logic 232
Chapter 11 Frequency Protection Functions 233
1 Chapter Overview 235
2 Frequency Protection Overview 236
2.1 Frequency Protection Implementation 236
3 Underfrequency Protection 238
3.1 Underfrequency Protection Implementation 238
3.2 Underfrequency Protection Logic 238
3.3 Application Notes 239
3.3.1 Setting Guidelines 239
4 Overfrequency Protection 240
4.1 Overfrequency Protection Implementation 240
4.2 Overfrequency Protection Logic 240
4.3 Application Notes 241
4.3.1 Setting Guidelines 241
5 Independent R.O.C.O.F Protection 242
5.1 Indepenent R.O.C.O.F Protection Implementation 242
5.2 Independent R.O.C.O.F Protection Logic 243
5.3 Application Notes 243
5.3.1 Setting Guidelines 243
6 Frequency-supervised R.O.C.O.F Protection 245
6.1 Frequency-supervised R.O.C.O.F Implementation 245
6.2 Frequency-supervised R.O.C.O.F Logic 246
6.3 Application Notes 246
6.3.1 Frequency-Supervised R.O.C.O.F Example 246
6.3.2 Setting Guidelines 247
7 Average Rate of Change of Frequency Protection 248
7.1 Average R.O.C.O.F Protection Implementation 248
7.2 Average R.O.C.O.F Logic 249
7.3 Application Notes 249
7.3.1 Setting Guidelines 249
8 Load Shedding and Restoration 251
8.1 Load Restoration Implementation 251
8.2 Holding Band 251
8.3 Load Restoration Logic 254
8.4 Application Notes 254
8.4.1 Setting Guidelines 254
Chapter 12 Power Protection Functions 257
1 Chapter Overview 259
2 Overpower Protection 260
2.1 Overpower Protection Implementation 260
2.2 Overpower Logic 261
2.3 Application Notes 261
2.3.1 Forward Overpower Setting Guidelines 261
2.3.2 Reverse Power Considerations 261
2.3.3 Reverse Overpower Setting Guidelines 262
3 Underpower Protection 263
3.1 Underpower Protection Implementation 263
3.2 Underpower Logic 264
3.3 Application Notes 264
3.3.1 Low Forward Power Considerations 264
3.3.2 Low Forward Power Setting Guidelines 264
4 Sensitive Power Protection 266
P14x Contents
P14xEd1-TM-EN-1 vii
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