Table Of Contents - GE AK-2-50 Maintenance Manual

Table of Contents

Table Of Contents2
Operation3
Manual Closing3
Introduction3
Manual Maintenance4
Closing Of Electrical Breakers4
Electrical Closing4
Quick Close For Electrical Breakers4
Electrical Tripping5
Inserting Safety Pin5
Inspection5
Maintenance5
Troubleshooting6
Basic Breaker Components7
Lubrication7
Separation Of Front And Rear Frames7
Replacement - Ak Breakers/Akf Breakers7
Arc Quenchers7
Pole Unit Assembly8
Measuring Contact Wipe9
Measuring Contact Pressure9
Adjusting Contact Wipe And Pressure10
Contact Sequence10
Contact Gap11
Replacement Of Contacts11
Pole Unit Assembly View12
Operating Mechanisms13
Charging The Closing Springs13
Closing Spring And Charging Mechanism14
Operating Mechanism14
Tripping The Breaker15
Adjustments15
Replacement15
Rear View Of Front Frame - Ak-5015
Quick Close Breaker Adjustments16
Quick-Closing Release Latch16
Release Arm Adjusting16
Stored-Energy Manual Mechanism17
Closing The Breaker17
Inserting The Safety Pin17
Replacement Of Mechanism Parts17
Contact Adjustments19
Measurements19
Adjusting Center-Pole Contact Wipe And Overlap19
Field Discharge Contacts - Center Pole19
Akf Mechanism20
Auxiliary Switch21
Ak Breakers21
Adjusting Center-Pole Open Contact Gap21
Contact Replacement21
Auxiliary Switch - Standard Breaker22
Auxiliary Switch Linkage - Akf Breakers22
Electrical Closing Devices And Controls23
Protective Devices23
Cut-Off Switches23
Static Time Delay Under-Voltage Tripping Device23
Control Relay23
Static Time-Delay Undervoltage Tripping Device24
Static Time Delay Undervoltage Wiring Diagram24
Undervoltage Lockout Device25
Instantaneous Under-Voltage Tripping Device25
Thermostat Wiring Diagram25
Direct Acting Tripping Device26
Short Time-Delay Tripping26
Long Time Delay Tripping26
Instantaneous Tripping26
Direct-Acting Tripping Device27
Series Overcurrent Tripping Device28
Overcurrent Tripping Device Ec-2 View30
Series Overcurrent Tripping Device Ec-2, Ec-2A, Ak-5031
Long Time-Delay And High-Set Instantaneous Tripping31
Instantaneous High-Set Tripping31
Time-Adjusting Indexing31
Reverse Current Tripping Device32
Power Sensor Trip - General Description33
Reverse Current Tripping Device - Ak-50 Only33
False Tripping Caused By Faulty Ground Fault Detection34
Magnetic Coil Assembly For Ak-3-50 Breakers34
Testing Magnetic Coils35
Replacement Of Power Sensor Components35
Power Supply36
Sensor Coils36
Power Sensor Cabling Diagram36
Power Sensor Kit36
Power Sensor Unit View37
Magnet Trip Device View37
Selective Tripping39
Typical Time-Current Characteristics For Overcurrent Trip Devices39
Long-Time Delay/Short-Time Delay/Instantaneous Time Current Curves40
Drawout Mechanism42
Breaker Accessories43
Primary Disconnects - Ak-50 Only43
Secondary Disconnects43
Shunt-Tripping Device44
Bell Alarm And Lockout Device44
Replacement Of Coil44
Open Fuse Lockout Device45
Bell Alarm And Lockout Device Diagram45
Open Fuse Lockout Device Diagram46
Renewal Parts47
Recommended Tools47