Instruction manual

KRB-5377
1. SAFETY NOTICES 5
2. RECEIVING AND HANDLING 7
2-1. Transportation Precautions 7
2-1-1. Transporting the ACB 7
2-1-2. Transporting the breaker body 8
2-1-3. Transporting the draw-out cradle 8
2-2. Storage Precautions 8
2-3. Installation Precautions 9
3. GENERAL 16
3-1. Types and Descriptions 16
3-2. Parts and Functions 19
3-3. Circuits and Ratings 22
4. OPERATION 29
4-1. Charging and Opening operation 29
4-1-1. Charging operation 29
4-1-2. Closing operation 30
4-1-3. Opening operation 30
4-1-4. Motion of trip indication and spring charge
indication switches 30
4-1-5. Motion of operation mechanisms 31
4-2. Draw-out and Insertion Operation 33
4-2-1. General 33
4-2-2. Draw-out operation 34
4-2-3. Putting the breaker body back into the draw-out
cradle 35
4-2-4. Contact status of auxiliary and position switches 37
4-3. ON-OFF Button Cover Locking Procedure 37
4-4. Lock in OFF Procedure 38
4-5. Position Lock Lever Locking Procedure 38
4-6. Breaker Fixing Bolt Securing Procedure 39
4-7. OCR Cover Locking Procedure 39
5. OVERCURRENT RELEASE (OCR) 40
5-1. Specifications 40
5-2. Characteristics 42
5-2-1. L characteristic for general feeder 42
5-2-2. R characteristic for general feeder 45
5-2-3. S characteristic for generator protection 49
5-3. OCR Setting Procedure 51
5-3-1. OCR Setting Procedure (AGR-11B type) 51
5-3-2. OCR Setting Procedure (AGR-21B,22B,31B type)
52
5-3-2-1. General 52
5-3-2-2. Available screens 52
5-3-2-3. Monitor screen 55
5-3-2-3-1. Monitor screen (AGR-21B,22B) 55
5-3-2-3-2. Monitor 1 screen (AGR-31B) 56
5-3-2-3-3. Monitor 2 screen (AGR-31B) 57
5-3-2-4. Setup screen 59
5-3-2-4-1. Setup screen(AGR-21B,22B) 59
5-3-2-4-2. Setup screen(AGR-31B) 61
5-3-2-5. Reset screen 64
5-3-2-5-1. Reset screen (AGR-21B,22B) 64
5-3-2-5-2. Reset screen(AGR-31B) 65
5-3-2-6. Setting 1 screen 66
5-3-2-7. Setting 2 screen 68
5-3-2-8. Maintenance screen 71
5-4. OCR Function Check 72
5-5. Operation Indication and Indication Resetting
Procedure 74
5-5-1. Operation Indication (AGR-11B type) 74
5-5-2. Operation Indication and Indication Resetting
Procedure (AGR-21B,22B,31B type) 75
6. MAINTENANCE, INSPECTION AND PARTS
REPLACEMENT 77
6-1. Inspection Procedures 78
6-2. Parts Replacement Procedure 81
6-2-1. Preparation 81
6-2-2. Arc chambers 84
6-2-3. Stationary contact 85
6-2-4. Moving contact 87
6-2-5 Latch release coil (LRC) 89
6-2-6. Shunt trip device (SHT) 90
6-2-7. Control relay 91
6-2-8. Magnet hold trigger (MHT) 94
6-2-9. Auxiliary switches 95
7. TROUBLESHOOTING FLOWCHARTS 97
8.DOOR INTERLOCK 100
9. MECHANICAL INTERLOCK DEVICE. (HORIZONTAL
TYPE) 102
TABLE OF CONTENTS