~ Distribution Breaker Table of Contents-
Section 1. Introduction
1-1 Safety 1-2 Maintenance
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Section 2. Receiving, Handling & Storage
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Section 3. Description
3-1 High Voltage Compartment 3-2 Bushing CulTent Transfonners
3-3 Device and Tenninal Board ,
3-4 Mechanism ,
3-5 Emergency Trip 3-6 Control Circuit
Section 8. Maintenance
8-1 GeneraL 8-2 SeIVice Conditions 8-3 PowerVac Interrupter 8-4 Contact Erosion 8-5 Transfer Band Wear ;...
8-6 Insulation Tests 8-7 High-Potential Test 8-8 Vacuum Interrupter Integrity Test
8-9 Primary Circuit Resistance 8-10 Power Factor 8-11 Mechanism 8-12 Primary Insulation Parts 8-13 Lubrication 8-14 Recommended Maintenance
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Section r 4. Installation
4-1 Location and Mounting 4-2 Connections 4-3 Ground Connections 44 Control and Secondary Wiring.
4-5 Primary Connections 4-6 Inspection Before Operation Safety Precautions 4-7 Slow Closing
Section 9. Repair and Replacement
9-1 Entrance Bushing Removal 27
9-2 Replacement of IntelTUpter Assemblies .27
9-3 Pin Retaining Rings 27
94 Control Switches 27
9-5 Trip Coil Replacement 27
Tools Required 27
9-6 Closing Coil Replacement 28
9-7 Renewal Parts 28
Ordering Instructions 28
9-8 Breaker Removal 28
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Section 5. Operation
5-1 Close Spring Charging 5-2 Closing Operation 5-3 Opening Operation 54 Trip Free Operation 5-5 Control Circuit
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Section 6. Measurements & Adjustments
6-1 Wipe Adjustment 6-2 Emergency Trip 6-3 Primary Contact Erosion Indication 6-4 Contact Gap Adjustment 6-5 Control Coil Plunger Travel Trip Coil Close Coil Control Switches
List of Figures
1. High Voltage Compartment 2. Low Voltage Compartment-Mechanism Side 3. Toggle Linkage Positions of the MI.-18H Mechanism.
4. Low Voltage Compartment-Relay Side 5. Schematic ofMI.-I8H Mechanism 6. Manual Charging , 7. Close Spring Gag , 8. Ratings and Adjustments 9. Adjustments 10. Gap Measurement I 1. Erosion Indicator 12. Trip Coil and Linkage 13. Typical Wiring Diagram for MI.-I8H Mechanism 14. Mechanical Adjustments and Settings 15. Closing Coil and Linkage 16. Bottom View of MI.-I 8H Spring Charged Mechanism,
17. Sample Operating Speed Graphs 18. Vacuum Interrupter Assembly , ,
19. Travel Recorder Auxiliary Linkage ,
20. Opening Dashpot
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Section 7: Electrical Checks
7-1 Control Power 7-2 Timing 7-3 Opening and Closing Speed.
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List of Tables
1. Control Devices and Voltages '
2. Summary of Adjustments and Critical Dimensions ,
3. Recommended Spare Parts for PowerVac Distribution
Breakers with ML-18H Mechanism
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~-l ReceiVIng 2-2 Handling 2-3 Storage
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