21/07/2010
2
MRAR 01/96 C
Contents
Contents
1. Introduction ......................................................................................................................................................................... 4
2. Application .......................................................................................................................................................................... 5
3. Features and characteristics ................................................................................................................................................. 5
4. Design.................................................................................................................................................................................. 6
4.1 Circuit Diagram ................................................................................................................................................................ 6
4.1.1 Information Inputs .......................................................................................................................................................... 6
4.1.2 Output Relays ................................................................................................................................................................. 7
4.2 LED's ................................................................................................................................................................................. 7
4.2.1 Status LED's ................................................................................................................................................................... 8
4.2.2 Adjusting LED's.............................................................................................................................................................. 8
4.2.3 Remote data communication........................................................................................................................................... 8
4.2.4 Push buttons ................................................................................................................................................................. 10
4.3 Code jumpers................................................................................................................................................................... 10
4.3.1 Password programming ............................................................................................................................................... 11
4.3.2 Alarm and Trip relay function ...................................................................................................................................... 11
5. Working Principles ............................................................................................................................................................ 12
5.1 Status Descriptions .......................................................................................................................................................... 12
5.1.1 Inactive ......................................................................................................................................................................... 12
5.1.2 Reclaim Time ................................................................................................................................................................ 12
5.1.3 AR Ready ...................................................................................................................................................................... 12
5.1.4 AR Starting ................................................................................................................................................................... 12
5.1.5 AR Cycle ....................................................................................................................................................................... 12
5.1.5 AR Blocked ................................................................................................................................................................... 12
5.2 Description of Status Transition ...................................................................................................................................... 13
5.3 Functional Sequence........................................................................................................................................................ 14
5.3.1 Switching on the MRAR Relay...................................................................................................................................... 14
5.3.2 Switching on the Circuit Breaker Manually ................................................................................................................. 14
5.3.3 Switching off the Circuit Breaker Manually ................................................................................................................. 14
5.3.4 Starting Auto-Reclosing................................................................................................................................................ 14
5.3.5 Reclosing Without Success ........................................................................................................................................... 14
5.3.6 Successful Reclosing..................................................................................................................................................... 15
5.3.7 Repeated Reclosing....................................................................................................................................................... 15
5.3.8 External Blocking and Reseting.................................................................................................................................... 15
5.3.9 Supervision of the Circuit Breaker Ready Information ................................................................................................ 15
5.4 Operation and Release of the Output Relays................................................................................................................... 15
5.5 Blocking and Cancellation of Blocking ........................................................................................................................... 16
5.5.1 Blocking........................................................................................................................................................................ 16
5.5.2 Cancellation of Blocking .............................................................................................................................................. 16
5.6 Circuit Example - Connection Diagram of the MRAR and MRI Together .................................................................. 17
5.7.1 Two Times AR Programming of the Unit, At Second Attempt Successful..................................................................... 18
5.7.2 Two Time Programming of the Unit, Reclosing Unsuccessful. .................................................................................... 19
5.7.3 Manual Switching On of the Circuit Breaker to Faulty Lines ...................................................................................... 19
6. Operation and Adjustment................................................................................................................................................. 20
6.1 Definition of Setting Values ............................................................................................................................................. 20
6.2 The AR Counter ............................................................................................................................................................... 20
7. Testing ............................................................................................................................................................................... 21
7.1 Power On......................................................................................................................................................................... 21
7.2 Output Relay Tests........................................................................................................................................................... 21
7.3 Checking the Set Values .................................................................................................................................................. 21
7.4 Checking the CB Status Input Circuit (28-15)................................................................................................................. 21
7.5 Checking the External Block Input Circuit (24-15)......................................................................................................... 21
7.6 Checking the External Reset Input Circuit (25-15) ......................................................................................................... 21
8. Technical Data................................................................................................................................................................... 22
8.1 Input Circuits................................................................................................................................................................... 22
8.2 Output Relays .................................................................................................................................................................. 22
8.3 Setting Ranges and Steps................................................................................................................................................. 22