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Functions 2.16 Frequency Protection 2.16 Frequency Protection 270 The frequency protection function detects abnormally high and low frequencies. If the network frequency lies outside the admissible range, appropriate actions are initiated. For generators, e.g. the machine is separated from the network. Network decoupling or load shedding can be initiated in networks. A frequency decrease occurs when the system experiences an increase in real power demand or sub-networks that cannot (or not fast enough) be compensated by additional performance generation. Real power demand has to be decreased by load shedding. A faulty frequency, or speed regulation, can also be the cause in the power station sector. Frequency decrease protection is also applied for generators which operate (temporarily) to an island network. This is due to the fact that the reverse power protection cannot operate in case of a drive power failure. The generator can be disconnected from the power system using the frequency decrease protection. An increase in system frequency occurs when large blocks of load are removed from the system, or again when a malfunction occurs with a generator governor or AGC system. For rotating machines this increased speed means an increased mechanical loading. There is also a risk of self-excitation for generators feeding long lines under no-load conditions. Frequency protection consists of four frequency elements. Each stage is independent and can initiate different control functions. Three frequency stages are designed for decreased frequency detection (f
Figure 2-106 Logic diagram of frequency protection <strong>SIPROTEC</strong>, 7UT6x, Manual C53000-G1176-C230-2, Release date 06.2012 Functions 2.16 Frequency Protection 271
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SIPROTEC Differential Protection 7U
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Preface Additional Support Training
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Preface Typographic and Symbol Conv
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Preface 8 SIPROTEC, 7UT6x, Manual C
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Contents 10 2.2 Differential Protec
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Contents 12 2.14 Undervoltage Prote
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Contents 14 2.23 Average Values, Mi
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Contents A Appendix. . . . . . . .
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Introduction 1.1 Overall Operation
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Introduction 1.1 Overall Operation
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Introduction 1.2 Application Scope
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Introduction 1.3 Characteristics Di
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Introduction 1.3 Characteristics Un
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Introduction 1.3 Characteristics Ex
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Introduction 1.3 Characteristics 30
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Functions 2.1 General 2.1 General 3
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Functions 2.1 General 2.1.1.3 Infor
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Functions 2.1 General 2.1.3 Configu
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Functions 2.1 General Differential
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Functions 2.1 General Single-phase
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Functions 2.1 General Undervoltage
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Functions 2.1 General 44 Addr. Para
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Functions 2.1 General 2.1.4 Power S
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Functions 2.1 General 48 Figure 2-2
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Functions 2.1 General 50 Note If yo
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Functions 2.1 General Special Consi
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Functions 2.1 General 54 Current co
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SIPROTEC, 7UT6x, Manual C53000-G117
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Assignment of Voltage Measuring Inp
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Figure 2-9 Power measurement at gen
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Functions 2.1 General 66 The mode o
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Functions 2.1 General Figure 2-12 R
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Functions 2.1 General Current Trans
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Functions 2.1 General 72 Similar ap
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Functions 2.1 General 74 Hereinafte
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Functions 2.1 General 76 Figure 2-1
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Functions 2.1 General 80 As the abo
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Functions 2.1 General 2.1.4.4 Circu
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Functions 2.1 General 2.1.5 Setting
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Addr. Parameter C Setting Options D
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No. Information Type of Information
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2.2 Differential Protection SIPROTE
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Figure 2-25 Tripping logic of the d
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Earthed Starpoint SIPROTEC, 7UT6x,
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Use on Single-phase Auto-transforme
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2.2.3 Differential Protection for G
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2.2.5 Differential Protection for M
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2.2.6 Single-phase Differential Pro
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Functions 2.2 Differential Protecti
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Functions 2.3 Restricted Earth Faul
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2.4.1.2 Inverse Time Overcurrent Pr
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2.4.1.5 Inrush Restraint SIPROTEC,
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Figure 2-74 Fast busbar protection
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Functions 2.4 Time Overcurrent Prot
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2.4.2.3 Information List No. Inform
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Functions 2.6 Dynamic Cold Load Pic
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Functions 2.6 Dynamic Cold Load Pic
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Functions 2.7 Single-Phase Time Ove
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Functions 2.7 Single-Phase Time Ove
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2.8 Unbalanced Load Protection SIPR
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Pickup, Trip Dropout SIPROTEC, 7UT6
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Thermal Stage Pickup, Warning Therm
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Page 223: Example: Machine I N = 483 A SIPROT
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Page 246 and 247: Functions 2.11 Overexcitation Prote
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Page 253: Delay and Logic Two delay times are
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Page 262: Functions 2.14 Undervoltage Protect
Page 267: 2.15.1 Function Description SIPROTE
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Page 279 and 280: Delay Time and Breaker Failure Trip
Page 281 and 282: Initiation SIPROTEC, 7UT6x, Manual
Page 285 and 286: 2.18 External Trip Commands 2.18.1
Page 288 and 289: Functions 2.19 Monitoring Functions
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Page 307: No. Information Type of Information
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Page 314 and 315: Functions 2.21 Disconnection of Mea
Page 316 and 317: Functions 2.22 Additional Functions
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Functions 2.22 Additional Functions
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2.22.4 Differential and Restraining
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2.22.10 Commissioning Aids SIPROTEC
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2.23 Average Values, Minimum and Ma
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2.23.2 Min/Max Measurement Setup 2.
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Functions 2.24 Command Processing C
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Functions 2.24 Command Processing 3
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Mounting and Commissioning 3.1 Moun
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Mounting and Commissioning 3.1 Moun
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RTD-Box SIPROTEC, 7UT6x, Manual C53
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The ratings of the fuse are printed
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Board Arrangement 7UT613/63x SIPROT
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3.1.2.3 Switching Elements on Print
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Processor Module C-CPU-2 SIPROTEC,
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Input/Output Board C-I/O-2 (only 7U
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The input/output board C-I/O-2 carr
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Input/Output Board C-I/O-9 (only 7U
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Table 3-22 Assignment of jumpers fo
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Note SIPROTEC, 7UT6x, Manual C53000
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Table 3-24 Exchange Interface Modul
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RS485 Interface SIPROTEC, 7UT6x, Ma
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3.1.3 Mounting 3.1.3.1 Panel Flush
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3.1.3.2 Rack and Cubicle Mounting S
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Figure 3-25 Installation of a 7UT63
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System interface SIPROTEC, 7UT6x, M
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RTD box SIPROTEC, 7UT6x, Manual C53
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3.3.1 Test Mode / Transmission Bloc
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Structure of the Dialog Box SIPROTE
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Structure of the Dialog Box SIPROTE
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An update is made: Exiting the Proc
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Table 3-30 Indications on matching
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Flexible Functions Current Function
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Mounting and Commissioning 3.3 Comm
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Figure 3-46 Phasor Diagram of the P
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Mounting and Commissioning 3.4 Fina
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Technical Data 4.1 General 4.1 Gene
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Technical Data 4.1 General 4.1.5 Co
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Operating Range Frequency (Transfor
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Operating Times (Generators, Motors
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Operating Time (Busbars, Short Line
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Technical Data 4.4 Time Overcurrent
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Technical Data 4.8 Unbalanced Load
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Technical Data 4.8 Unbalanced Load
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Technical Data 4.11 Overexcitation
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Technical Data 4.20 User-defined Fu
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Technical Data 4.20 User-defined Fu
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Time Synchronisation Commissioning
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4.23.3 Panel Surface Mounting (Encl
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4.23.5 Panel Surface and Cabinet Mo
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4.23.7 RTD box Figure 4-26 Dimensio
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Appendix A This appendix is primari
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Additional Specification L for Furt
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Additional Specification L for Furt
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1) Only in connection with position
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Exchangeable Interface Modules SIPR
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SIMATIC CFC 4 Varistor SIPROTEC, 7U
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7UT613*-*D/E Figure A-2 Overview di
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7UT633*-* D/E Figure A-3 General di
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7UT633*-* P/Q Figure A-4 General di
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7UT635*-* D/E Figure A-5 General di
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7UT635*-* P/Q Figure A-6 General di
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7UT613*-* B Figure A-8 General diag
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7UT633*-* B Figure A-9 General diag
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7UT633*-* N Figure A-10 General dia
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7UT635*-* B Figure A-11 General dia
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7UT635*-* N Figure A-12 General dia
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Figure A-22 Connection example 7UT6
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A.3.2 Voltage Transformer Connectio
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A.3.3 Assignment of Protection Func
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Appendix A.5 Default Settings A.5 D
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Appendix A.5 Default Settings A.5.5
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Appendix A.5 Default Settings A.5.6
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Addr. Parameter Setting Options Def
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A.8 Settings Addresses which have a
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Addr. Parameter Function C Setting
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A.9 Information List SIPROTEC, 7UT6
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No. Description Function Type of In
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Appendix A.9 Information List 640 N
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Literature /1/ SIPROTEC 4 System Ma
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LVU Master Metered value MLFB Modem
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Index A Acknowledgement of commands
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Fault Value Storage Storage Criteri
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P Parameter Group Changeover 36, 97
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Z Zero Current 124 Zero Sequence Cu
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1 2 3 4 A - SIPROTEC

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