Woodward HighPROTEC MRU4 User manual

Version: 3.6
Original document ‧ English
Manual MRU4-3.6-EN-MAN
Revision: - (Build 42228)
© 2019
Voltage Protection
MRU4

Manual (original)
Woodward Kempen GmbH
Krefelder Weg 47 ∙ D–47906 Kempen (Germany)
Postfach 10 07 55 (P.O.Box) ∙ D–47884 Kempen (Germany)
Telephone: [phone]
© 2019 Woodward Kempen GmbH
2 MRU4 MRU4-3.6-EN-MAN

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Table of Contents
1 MRU4 – Voltage Protection
1.1 Comments on the Manual
1.1.1 Important De󰊎nitions
1.1.2 Symbols and De󰊎nitions
1.1.2.1 Symbols in Function Diagrams
1.2 Information About the Device
1.2.1 Order Form of the Device
1.2.2 Navigation – Operation
1.2.2.1 Front Panel Parts
1.2.2.2 Softkey Symbols
1.3 Modules, Settings, Signals and Values
1.3.1 Parameter Settings
1.3.2 Adaptive Parameter Sets
1.3.3 Status Display
1.3.4 Menu Structure
1.3.5 Device Planning
1.3.6 Field Parameters
1.3.7 Device Parameters
1.3.8 Reset Counters, Values and Records
1.4 Security
1.4.1 Network Security
1.4.2 Passwords
1.4.3 Connection Passwords, Smart view Access
1.4.4 Access Level Passwords
1.4.5 Access Levels
1.4.6 Reset to Factory Defaults, Reset All Passwords
1.5 Acknowledgments
1.6 Measuring Values
1.7 Statistics
1.7.1 Con󰊎guration of the Minimum and Maximum Values
1.7.2 Con󰊎guration of the Average Value Calculation
1.7.2.1 Con󰊎guration of the Voltage-Based Average Value Calculation*
1.8 Smart view
1.9 DataVisualizer
2 Hardware
2.1 Dimension Drawings
2.2 MRU4 – Installation and Wiring
2.2.1 Grounding
2.2.2 Overview of Slots – Assembly Groups
2.2.3 Communication Protocol Codes
2.2.4 Legend for Wiring Diagrams
3MRU4MRU4-3.6-EN-MAN
Table of Contents

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
2.3 Slot X1
2.3.1 DI8-X Power Supply and Digital Inputs
2.4 Slot X2
2.4.1 BO-5 X - Assembly Group with 5 Binary Output Relays + 1 System Contact
2.5 Slot X3
2.5.1 TU – Voltage Measuring Inputs
2.5.2 Voltage Transformers
2.6 Slot X100: Ethernet Interface
2.6.1 Ethernet – RJ45
2.7 Slot X101
2.7.1 IRIG-B00X
2.8 Slot X103: Data Communication
2.8.1 Modbus® RTU / IEC 60870-5-103 via RS485
2.8.2 Pro󰊎bus DP/ Modbus® RTU / IEC 60870‑5‑103 via Fiber Optic
2.8.3 Pro󰊎bus DP via D‑SUB
2.8.4 Modbus® RTU / IEC 60870‑5‑103 via D‑SUB
2.8.5 Ethernet / TCP/IP via Fiber Optics
2.9 PC Interface – X120
2.10 Input, Output and LED Settings
2.10.1 LEDs
2.10.2 Con󰊎guration of the Digital Inputs
2.10.3 Output Relays Settings
3 Communication Protocols
3.1 General SCADA (Communication) Setting
3.2 TCP/IP Settings
3.3 Pro󰊎bus
3.4 IEC 61850
3.5 DNP3
3.5.1 Application Example: Setting a Relay
3.5.2 Deadband Settings in DNP3
3.6 IEC60870-5-103
3.7 Con󰊎gurable Communication Protocols
3.7.1 IEC 60870‑5‑104
3.7.2 Modbus®
3.7.3 High Tech Line 3-Compatible Modbus Datapoint Mapping
3.7.4 Data-Point Mapping Using the SCADAPTER
3.8 Time Synchronization
3.8.1 SNTP
3.8.2 IRIG-B00X
4 Protective Elements
4.1 Module Prot: General Protection
4.1.1 General Alarms and General Trips
4.1.2 Blockings
4 MRU4 MRU4-3.6-EN-MAN
Table of Contents

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
4.1.2.1 Blocking the Tripping Command
4.1.2.2 Activate, Deactivate or Block a Protection Function Temporarily
4.2 Interconnection
4.3 V - Voltage Protection [27,59]
4.3.1 Commissioning: Overvoltage Protection [59]
4.3.2 Commissioning: Undervoltage Protection [27]
4.4 VG, VX – Voltage Supervision [27A, 59A]
4.4.1 Commissioning: Residual Voltage Protection – Measured [59N]
4.4.2 Commissioning: Residual Voltage Protection – Calculated [59N]
4.5 f – Frequency [81O/U, 78, 81R]
4.5.1 Operating Modes “f<”, “f>”
4.5.2 Operating Mode “df/dt”
4.5.3 Operating Modes “f< and df/dt”, “f> and df/dt”
4.5.4 Operating Modes “f< and DF/DT”, “f> and DF/DT”
4.5.5 Operating Mode “delta phi” – [ANSI 78V]
4.5.6 Commissioning: Overfrequency [f>]
4.5.7 Commissioning: Underfrequency [f<]
4.5.8 Commissioning: df/dt - ROCOF
4.5.9 Commissioning: f< and -df/dt – Underfrequency and ROCOF
4.5.10 Commissioning: f> and df/dt – Overfrequency and ROCOF
4.5.11 Commissioning: f< and DF/DT – Underfrequency and DF/DT
4.5.12 Commissioning: f> and DF/DT – Overfrequency and DF/DT
4.5.13 Commissioning: delta phi - Vector Surge
4.6 V 012 – Voltage Asymmetry [47]
4.6.1 Commissioning: Asymmetry Protection
4.7 Sync - Synchrocheck [25]
4.8 Reconnection Module
4.9 LVRT – Low Voltage Ride Through [27(t)]
4.10 Intertripping (Remote)
4.10.1 Commissioning: Intertripping
4.11 ExP - External Protection
4.11.1 Commissioning: External Protection
4.12 Supervision
4.12.1 CBF – Circuit Breaker Failure [50BF*/62BF]
4.12.1.1 Principle – General Use
4.12.1.2 Functionality
4.12.1.3 Commissioning Example: Supervision Scheme 50BF
4.12.2 TCS - Trip Circuit Supervision [74TC]
4.12.2.1 Commissioning: Trip Circuit Supervision [74TC]
4.12.3 VTS – Voltage Transformer Supervision [60FL]
4.12.3.1 Commissioning: Voltage Transformer Supervision (via DI)
4.12.3.2 Commissioning: Voltage Transformer Failure [60FL]
4.12.4 Phase Sequence Supervision
5MRU4MRU4-3.6-EN-MAN
Table of Contents

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
5 Control / Switchgear-Manager
5.1 Switchgear Control
5.1.1 Settings within the Protection Device
5.1.2 Switch
5.1.3 Invisible Switch
5.1.4 Circuit Breaker
5.1.5 Circuit Breaker1
5.1.6 Disconnector (Isolator)
5.1.7 Disconnector-Earthing Combination
5.1.8 Earthing Switch
5.1.9 Fuse-Load Switch
5.1.10 Fuse-Load Switch – Disconnector
5.1.11 Fused-Disconnector (Isolator)
5.1.12 Load Switch
5.1.13 Load Switch – Disconnector
5.1.14 Three Position Switch
5.1.15 Withdrawable Circuit Breaker
5.1.16 Withdrawable Fuse Load Switch
5.2 Switchgear Con󰊎guration
5.3 Switchgear Wear
5.4 Control - Example: Switching of a Circuit Breaker
6 System Alarms
7 Recorders
7.1 Disturbance Recorder
7.2 Fault Recorder
7.3 Event Recorder
7.4 Trend Recorder
8 Programmable Logic
9 Self-Supervision
9.1 Device Start (Reboot)
9.2 Self-Supervision Messages
9.3 Syslog
9.4 Device Taken out of Service (“Device Stopped”)
10 Commissioning
10.1 Commissioning/Protection Test
10.2 Putting out of Operation – Plug out the Relay
10.3 Service and Commissioning Support
10.3.1 General
10.3.2 Phase Sequence
10.3.3 Forcing the Relay Output Contacts
6 MRU4 MRU4-3.6-EN-MAN
Table of Contents

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
10.3.4 Disarming the Relay Output Contacts
10.3.5 Fault Simulator (Sequencer)*
11 Servicing and Maintenance
12 Technical Data
12.1 Speci󰊎cations / Tolerances
12.1.1 Speci󰊎cations of the Real Time Clock
12.1.2 Speci󰊎cations of the Measured Value Acquisition
12.1.3 Protection Elements Accuracy
12.1.3.1 Voltage-Related Protection
12.1.3.2 Frequency Protection
12.1.3.3 Miscellaneous Protection and Supervision
13 Appendix
13.1 Standards
13.1.1 Approvals
13.1.2 Design Standards
13.1.3 Electrical Tests
13.1.4 Environmental Tests
13.1.5 Mechanical Tests
13.2 IEC 60870‑104 Interoperability
13.2.1 System or device
13.2.2 Network con󰊎guration
13.2.3 Physical layer
13.2.4 Link layer
13.2.5 Application layer
13.2.6 Basic application functions
13.3 Abbreviations, and Acronyms
13.4 List of ANSI Codes
13.5 Revision History
13.5.1 Version: 3.6
13.5.2 Version: 3.4
13.5.3 Version: 3.1
13.5.4 Version: 3.0.b
13.5.5 Version: 3.0
14 Index
7MRU4MRU4-3.6-EN-MAN
Table of Contents

1 MRU4 – Voltage Protection
The MRU4 is a protection relay which uses the latest Dual-Core-Processor Technology to
provide precise and reliable protective functions and is very easy to operate.
The MRU4 is designed to protect electrical equipment from dangerous voltage
󰊏uctuations. For example protection against under voltages caused by mains
shortcircuits, or overvoltages due to load shedding or failure of a generator voltage
controller. Its compact design makes the MRU4 ideal for installation within the LV terminal
compartments of compact SF6-insulated MV systems.
The intuitive operating concept with plausibility checks and extensive commissioning
functions such as the built-in fault simulator allows a safe and time-optimized
maintenance and commissioning. The parameter setting and evaluation software Smart
view can be used consistently across the entire family of devices.
Functional Overview
3(4)
74 TC
Standard
25
1(0)
LGC (Programmable Logic)CLK (IRIG-B00X)
Option
SNTP Switchgear Wear
Control
Intertripping
MRU4
47 27 59 59N 81 U/O 81R
MRU4_Z01
62BF
LVRT
60FL 78
Option
Recorders:
SER (Event)
DDR (Disturbance)
DFR (Fault)
Statistic
Trend
MET (Measured
and calculated values)
f
delta phi
V
VE
V1
Fig. 1: Functional overview of the MRU4.
8 MRU4 MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection

1.1 Comments on the Manual
This manual explains in general the tasks of device planning, parameter setting,
installation, commissioning, operation and maintenance of the HighPROTEC devices.
The manual serves as working basis for:
• Engineers in the protection 󰊎eld,
• commissioning engineers,
• people dealing with setting, testing and maintenance of protection and control
devices,
•as well as trained personnel for electrical installations and power stations.
All functions concerning the type code will be de󰊎ned. Should there be a description of
any functions, parameters or inputs/outputs which do not apply to the device in use,
please ignore that information.
All details and references are explained to the best of our knowledge and are based on
our experience and observations.
This manual describes the (optionally) full featured versions of the devices.
All technical information and data included in this manual re󰊏ect their state at the time
this document was issued. We reserve the right to carry out technical modi󰊎cations in line
with further development without changing this manual and without previous notice.
Hence no claim can be brought based on the information and descriptions this manual
includes.
Text, graphic and formulae do not always apply to the actual delivery scope. The
drawings and graphics are not true to scale. We do not accept any liability for damage
and operational failures caused by operating errors or disregarding the directions of this
manual.
No part of this manual is allowed to be reproduced or passed on to others in any form,
unless Woodward have approved in writing.
This user manual is part of the delivery scope when purchasing the device. In case the
device is passed on (sold) to a third party, the manual has to be handed over as well.
Any repair work carried out on the device requires skilled and competent personnel who
need to be well aware especially of the local safety regulations and have the necessary
experience for working on electronic protection devices and power installations (provided
by evidence).
Information Concerning Liability and Warranty
Woodward does not accept any liability for damage resulting from conversions or changes
carried out on the device or planning (projecting) work, parameter setting or adjustment
changes done by the customer.
The warranty expires after a device has been opened by others than Woodward
specialists.
Warranty and liability conditions stated in Woodward General Terms and Conditions are
not supplemented by the above mentioned explanations.
9MRU4MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection
1.1 Comments on the Manual

Structure of This Manual
• Safety 󰊎rst! Make yourself familiar with the most important safety messages used
throughout this manual: ╚═▷ “Important De󰊎nitions”. Moreover, there is general
information about the delivery scope (╚═▷ “Information About the Device”) and this
manual and the conventions and symbols used here (╚═▷ “Symbols and
De󰊎nitions”).
•A general overview of the protection functions available with the MRU4 can be found
as a function diagram: ╚═▷ “1 Functional Overview”. Note that the availability of
some functions depends on the ordered device type. See ╚═▷ “Order Form of the
Device” for the available variants.
• The MRU4 uses a special modular concept for its settings, measured values and
signals. Although this concept of modules and parameters is simple and straight-
forward it is strongly recommended, especially for beginners, to make oneself
familiar with it: ╚═▷ “Modules, Settings, Signals and Values”
•Smart view is the operating program that can be installed on a Windows PC. It can
connect to the MRU4, and it can be used to do con󰊎guration work and retrieve data
(measuring and statistics values, fault records, etc.) from the MRU4. A few
introductory words are here: ╚═▷ “Smart view”; however, for a detailed description
you can consult the full Smart view Manual as a separate document.
• The hardware aspects (e. g. dimension diagrams and connection diagrams) can be
found here: ╚═▷ “Hardware”
• Various Security settings might have to be done, because the MRU4 is delivered with
no access restrictions and a very simple standard password that does not o󰊍er any
safety at all. Unless you are sure that no special access restrictions are required for
your application, it is strictly recommended to check the “Security” chapter: ╚═▷
“Security”
•A few settings are related to the MRU4 itself: ╚═▷ “Device Parameters”
• The MRU4 makes a lot of measured values available and maintains statistics of some
more values: ╚═▷ “Measuring Values” and ╚═▷ “Statistics” describe what concepts
and settings are related to this.
• The various communication protocols that the MRU4 makes available for
communicating with the substation are described in ╚═▷ “Communication Protocols”.
• The MRU4 can control a switchgear device. In general, one will probably use it to
control a circuit breaker, that is tripped by the protection functions in case of a fault.
╚═▷ “Control / Switchgear-Manager” describes the various aspects of the Control
functionality.
• The multitude of protection functions is described in sub-chapters within the
“Protection Functions” chapter: ╚═▷ “Protective Elements”. Keep in mind that there
is one “master protection” module that governs all protection functions: ╚═▷
“Module Prot: General Protection”. And furthermore, it is not only important to know
how to activate a protection module, it is also essential to know about the blocking
of a module: ╚═▷ “Blockings”
• Various kinds of events (disturbances, detected faults, etc.) are recorded by the
MRU4, so that you need to know how to access these records: ╚═▷ “Recorders”
• The MRU4 o󰊍ers programmable logic equations for programming inputs, outputs,
blocking of protective functions, and custom logic functions in the relay: ╚═▷
“Programmable Logic”
10 MRU4 MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection
1.1 Comments on the Manual

• In addition to the various protection functions, the MRU4 also features various
supervision functions. The main di󰊍erence is that – contrast to a protection
function – a supervision function does not issue any trip signal, but generates an
alarm signal under special circumstances. This alarm signal can be used to block
protection functions, or it can be assigned to any of the LEDs or some output: ╚═▷
“Supervision”
• Commissioning aspects for the MRU4: ╚═▷ “Commissioning”. But note that
protection-speci󰊎c commissioning descriptions are sub-chapters within the
respective chapters for the protection functions.
•Technical data, tolerances, and applicable standards: ╚═▷ “Technical Data”
• The last chapter in this document is the Index. There is one speciality with it: Under
the initial “⚙”, it lists the numbered signals “generated” in logic diagrams (see ╚═▷
“Symbols and De󰊎nitions”).
Related Documents
• MRU4 Reference Manual (MRU4‑3.6‑EN‑REF): All settings, signals and values
available with the MRU4 are listed here with their respective menu paths, default
values and value ranges.
• Smart view Manual (SMARTV‑x.xx‑EN‑MAN): The Technical Manual of the Smart view
operating software.
• HighPROTEC Troubleshooting Guide (HPT‑3.6‑EN‑TSG): A description of all device-
internal (error or warning) messages that the MRU4 might issue. (See also ╚═▷ “Self-
Supervision Messages”.)
This document should also be consulted whenever the »System OK« (“Operational”)
LED is not constantly green after the boot phase (╚═▷ “12 Boot Phase”).
•Wiring Diagrams (HPT‑3.6‑EN‑WDG) – [English only]: For each available device
variant (ordered by typecode), this document has a related diagram showing
(schematically) the rear view of the MRU4, with all hardware modules 󰊎tted and
terminal connections.
• SCADA reference documents:
◦ IEC 60870‑5‑103 Data Point List
◦ Modbus Data Point List
◦Pro󰊎bus Data Point List
◦ IEC 61850 Model Implementation Conformance Statement (MICS) – [English
only]
◦ IEC 61850 Protocol Implementation Conformance Statement (PICS) – [English
only]
◦ IEC 61850 Protocol Implementation Extra Information for Testing (PIXIT) –
[English only]
◦ IEC 61850 Tissue Implementation Conformance Statement (TICS) – [English
only]
11MRU4MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection
1.1 Comments on the Manual

1.1.1 Important De󰈌nitions
The types of messages shown below serve the safety of life and limb as well as for the
appropriate operating life of the device.
DANGER!
DANGER indicates an immediately dangerous situation that will result in death or serious
injury if it is not avoided.
WARNING!
WARNING indicates a hazardous situation that can result in death or serious injury if it is
not avoided.
CAUTION!
CAUTION indicates a possibly hazardous situation that can result in minor or moderate
injuries if it is not avoided.
NOTICE!
NOTICE is used to address practices not related to personal injury.
This symbol indicates useful tips and recommendations as well as information for e󰊐cient
and trouble-free operation.
Proper Use of the Device and of This Manual
CAUTION!
Do not put the MRU4 in service until it has been con󰊎gured and commissioned.
Read the User Manual.
For con󰊎guring the required protection functions, read ╚═▷ “Module Prot: General
Protection” and the related chapters within ╚═▷ “Protective Elements”.
For commissioning, read ╚═▷ “Commissioning” and the “Commissioning” sections within
the chapters that are related to the required protection functions.
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1.1 Comments on the Manual

WARNING!
FOLLOW INSTRUCTIONS
Read this entire manual and all other publications pertaining to the work to be performed
before installing, operating, or servicing this equipment. Practice all plant and safety
instructions and precautions. Failure to follow instructions can cause personal injury
and/or property damage.
WARNING!
PROPER USE
Any unauthorized modi󰊎cations to or use of this equipment outside its speci󰊎ed
mechanical, electrical, or other operating limits may cause personal injury and/or
property damage, including damage to the equipment. Any such unauthorized
modi󰊎cations: (1) constitute “misuse” and/or “negligence” within the meaning of the
product warranty thereby excluding warranty coverage for any resulting damage, and (2)
invalidate product certi󰊎cations or listings.
The programmable devices subject to this manual are designed for protection and also
control of power installations and operational devices that are fed by voltage sources with
a 󰊎xed frequency, i.e. 󰊎xed at 50 or 60 Hertz. They are not intended for use with Variable
Frequency Drives. The devices are further designed for installation in low-voltage (LV)
compartments of medium voltage (MV) switchgear panels or in de-centralized protection
panels. The programming and parameterization has to meet all requirements of the
protection concept (of the equipment that is to be protected). You must ensure that the
device will properly recognize and manage (e. g. switch o󰊍 the circuit breaker) on the
basis of your programming and parameterization all operational conditions (failures). The
proper use requires a backup protection by an additional protective device. Before
starting any operation and after any modi󰊎cation of the programming (parameterization)
test make a documentary proof that your programming and parameterization meets the
requirements of your protection concept.
The Self-Supervision Contact (Life-Contact) has to be wired with the substation
automation system in order to supervise and monitor the state of health of the
programmable protective device. It is very important that an alarm annunciation is driven
from the programmable protective device self-supervision contact (Life-Contact) that
requires immediate attention when tripped. The alarm indicates that the protective
device is no longer protecting the circuit and the system should be serviced.
Typical applications for this product family/device line are for instance:
• Feeder protection
• Mains protection
• Machine protection
• Transformer Protection
• Generator Protection
Any usage beyond these applications the devices are not designed for. This applies also
to the use as a partly completed machinery. The manufacturer cannot be held liable for
any resulting damage, the user alone bears the risk for this. As to the appropriate use of
the device: The technical data and tolerances speci󰊎ed by Woodward have to be met.
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1 MRU4 – Voltage Protection
1.1 Comments on the Manual

Out-of-date documentation?
This publication may have been revised or updated since this copy was produced. To
verify that you have the latest revision, please visit the download section of our website.
Please check the web site of Woodward for the latest revision of this Technical Manual and
if there is an Errata Sheet with updated information.
•Visit the company website (══▷ www.woodward.com) and search for the documents
you are interested in. (The ID of every document is printed on its cover page.)
•Alternatively, every HighPROTEC device has a QR code printed on it. Scan this code,
and you are taken to an online directory that contains all relevant documents in the
most recent version.
Important Information
WARNING!
In line with the customer’s requirement the devices are combined in a modular way (in
compliance with the order code). The terminal assignment of the device can be found on
the top of the device (wiring diagram).
14 MRU4 MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection
1.1 Comments on the Manual

CAUTION!
Electrostatic Discharge Awareness
All electronic equipment is electro static-sensitive, some components more than others.
To protect these components from electro static damage, you must take special
precautions to minimize or eliminate electrostatic discharges. Follow these precautions
when working with or near the control.
1. Before doing maintenance on the electronic control, discharge the static electricity on
your body to ground by touching and holding a grounded metal object (pipes, cabinets,
equipment, etc.).
2. Avoid the build-up of static electricity on your body by not wearing clothing made of
synthetic materials. Wear cotton or cotton-blend materials as much as possible because
these do not store static electric charges as much as synthetics.
3. Keep plastic, vinyl, and Styrofoam materials (such as plastic or Styrofoam cups, cup
holders, cigarette packages, cellophane wrappers, vinyl books or folders, plastic bottles,
and plastic ash trays) away from the control, the modules, and the work area as much as
possible.
4. Do not remove any printed circuit board (PCB) from the control cabinet unless
absolutely necessary. If you must remove the PCB from the control cabinet, follow these
precautions:
• Verify the safe isolation from supply. All connectors have to be unplugged.
• Do not touch any part of the PCB except the edges.
• Do not touch the electrical conductors, the connectors, or the components with
conductive devices or with your hands.
• When replacing a PCB, keep the new PCB in the plastic antistatic protective bag it
comes in until you are ready to install it. Immediately after removing the old PCB
from the control cabinet, place it in the antistatic protective bag.
To prevent damage to electronic components caused by improper handling, read and
observe the precautions in the Woodward manual 82715, “Guide for Handling and
Protection of Electronic Controls, Printed Circuit Boards, and Modules”.
Woodward reserves the right to update any portion of this publication at any time.
Information provided by Woodward is believed to be correct and reliable. However, no
responsibility is assumed by Woodward unless otherwise expressly undertaken.
© 2019 Woodward. All Rights Reserved.
15MRU4MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection
1.1 Comments on the Manual

1.1.2 Symbols and De󰈌nitions
Connection Diagram that is Printed on the Housing
There is a connection (wiring) diagram 󰊎xed onto the housing of the MRU4. This diagram
shows all terminals for this particular device variant.
A table of the symbols that can appear in this diagram can be found here: ╚═▷ “Legend
for Wiring Diagrams”
Load Reference Arrow System
• It is common practice to either use the “Load Reference Arrow System” for loads
(consumed energy) or the “Generator Reference System” for generators (generated
energy).
•All HighPROTEC protection devices (except generator protection devices) use
exclusively the “Load Reference Arrow System”. Generator protection devices
are working based on the “Generator Reference System”.
•This applies to directions and phase angles. The phase angle is de󰊎ned as the angle
between the current phasor and the voltage phasor.
• Current and voltage arrows are to be counted positive in the direction of the arrow.
Typographical Conventions
•»Parameters are indicated by right and left double arrow heads and written in italic.«
• »SIGNALS are indicated by right and left double arrow heads and small caps.«
• [Paths are indicated by brackets.]
•Software and Device names are written in italic.
•Module and Instance (Element) names are displayed italic and underlined.
• »Pushbuttons, Modes and Menu entries are indicated by right and left double arrow
heads.«
• ①②③ Image References
Numbered Signals in Function Diagrams
The signals labeled by encircled numbers are meant to signify connections between
di󰊍erent diagrams. So, if you 󰊎nd such an encircled number somewhere “on the left side”
of a diagram you might want to look up in which other diagram this particular signal has
been generated.
Therefore all encircled numbers appearing “on the right side” (i. e. as an output signal) of
a diagram are listed as part of the Index chapter.
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1.1 Comments on the Manual

1.1.2.1 Symbols in Function Diagrams
HPT_Y05
Prot .
Blo TripCmd
name .
Blo TripCmd
delta phi - Mode
Field Para
Setting Values
The upper box in the diagram on the left is the
usual symbol of a setting value in a function
diagram. The setting name is speci󰊎ed by its
module and parameter name, separated by a
dot “.” one from the other.
Second example: Thanks to the high degree of
modularisation in HighPROTEC protection
devices, the logic depicted in some function
diagrams is often valid for several modules. In
these cases, only a symbolic module name, for
example: “name”, is given. In the heading part
of the diagram, the meaning of “name” is
speci󰊎ed as a list of modules to which the
diagram applies.
In rare cases it is necessary to also specify the
menu path (or at least the top-level menu item),
because it would be too inconvenient to specify
this particular setting only based on module
name and parameter name. In the third
example, the setting »delta phi - Mode« is
marked as a Field Parameter (i. e. to be found
within menu branch [Field Para]).
Another remark: All diagrams in this document
show a small label, in this case: “HPT_Y05”. This
is the diagram name, i. e. a unique identi󰊎er for
the diagram. Of course, this is not a setting
name, nor any other part of the depicted logic.
All function diagrams have an identi󰊎er with the
characters “_Y”.)
HPT_Y06
name . Alarm delta phi
VL1
12
Prot. active name . active
Input and Output Signals
A binary (output) signal is shown on top.
Below the dashed line indicates a measured
value (i. e. an analog signal).
Bottom row, left: Numbered input signal; right:
numbered output signal: From the technical
point of view, there is no di󰊍erence to “normal”
(non-numbered) signals. But these signals
appear in several di󰊍erent diagrams, and the
numbering helps to identify and locate them
across the Technical Manual.
Therefore all encircled numbers appearing “on
the right side” (i. e. as an output signal) of a
diagram are listed as part of the Index chapter,
so that you can look up where a particular signal
has beeen “generated”.
17MRU4MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection
1.1 Comments on the Manual

HPT_Y07
calculated
name .
VX Source
measured 1
2
If the setting value of parameter »name . VX
Source« is set to “measured”, then output 1 is
active and output 2 is inactive.
If the setting value of parameter »name . VX
Source« is set to “calculated”, then output 1 is
inactive and output 2 is active.
HPT_Y08
name .
ExBlo1
no assignment
1..n, Assignment List
The setting value of parameter »name .
ExBlo1« is not a choice from a simple, 󰊎xed
selection list, but it is another parameter
(usually a binary output signal) that is assigned
from a parameter list.
This means that the setting parameter assumes
the value of the assigned parameter. In case of a
binary output signal, for example, it means that
the parameter »name . ExBlo1« is active
whenever the assigned output signal is active.
If no signal has been assigned then the output is
always inactive (and only the “no assignment”
box, which is not connected in this example,
would be active).
HPT_Y09
IL1 I<
%(V2/V1) > 40%
%(V2/V1)
Two types of comparator (“Schmitt triggers”):
Top row: If the analog input value (here: the
voltage ratio %(V2/V1)) is greater than the
speci󰊎ed threshold (here: 0.4) then the output
becomes active (=logical “1”).
Bottom row: This type has the opposite
functionality: If the analog value IL1 is below the
threshold (here: the setting value of parameter
I<«) then the output becomes active.
HPT_Y0A
├─────────────────┤
ton toff
t-Off Delay
t-On Delay
Timer stage: If the input becomes active, then
the output becomes active after the time ton
(setting value of »t-On Delay«) has elapsed
(switch-on delay).
If the input becomes inactive again, then the
output signal becomes inactive after the other
speci󰊎ed duration has elapsed (switch-o󰊍 delay
to󰊍, setting value of »t-O󰅠 Delay«).
HPT_YX0
OST .
Trip duration time
t
Hold time: This is a pulse which is triggered by
the input (and in this case, the pulse duration is
settable via parameter).
HPT_YX1
&≥1=1
The usual set of logic operators: AND, OR,
eXclusive OR (from left to right). The second
input of the XOR operator is negated.
18 MRU4 MRU4-3.6-EN-MAN
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1.1 Comments on the Manual

HPT_YX2
S
R1
1
1
a b c d
0 0 Unchanged
0 1 0 1
1 0 1 0
1 1 0 1
a
b
c
d
RS 󰊏ip-󰊏op with reset priority.
HPT_YX3
+
R
Edge-triggered counter.
HPT_YX4
IH1 IH2
Band-pass 󰊎lter (left: IH1, right: IH2).
19MRU4MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection
1.1 Comments on the Manual

1.2 Information About the Device
Scope of Delivery
1
5
4
3
2
The delivery scope includes:
(1) The transportation box
(2) The protective device
(3) The mounting nuts
(4) The test report
(5) The product DVD that includes the manuals and related documentation as well
as the parameter setting and evaluation software Smart view.
Please check the consignment for completeness on arrival (delivery note).
Please ascertain whether the type plate, connection diagram, type code and description
of the device tally.
If you have any doubts please contact our Service Department (contact address to be
found on the reverse of the manual).
Storage
The devices must not be stored outdoors. The storing facilities have to be su󰊐ciently
ventilated and must be dry (see Technical Data, ╚═▷ “Technical Data”).
Battery
The purpose of the battery is to bu󰊍er the real-time clock in case of an outage of the
protective device's power supply.
Since it is not used for normal operation of the MRU4, it is not expected under normal
conditions that a replacement be necessary during the life-time of the MRU4. If, however,
it happens that the battery needs to be replaced the MRU4 has to be sent to the
manufacturer as a service request.
20 MRU4 MRU4-3.6-EN-MAN
1 MRU4 – Voltage Protection
1.2 Information About the Device