Powell PowlVac IB-77120 Manuals

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Powell PowlVac IB-77120 Manual (59 pages)

MA 5kV Replacement Vacuum Circuit Breaker

Brand: Powell | Category: Circuit breakers | Size: 2 MB

Table of Contents
5
Introduction
12
Scope
12
Purpose
12
Instruction Bulletins AVAILABLE ELECTRONICALLY
12
Safety
12
SAFE Work Condition
12
SAFETY Guidelines
13
General
13
Specific
14
X-Rays
14
Safety Labels
14
Description
15
General
15
THE Stored ENERGY MECHANISM
15
Mechanical Description
15
Figure 1 - Side View of Powlvac-Nd MA Replacement Circuit Breaker
16
Figure 2 - Front View of Powlvac-Nd MA Replacement Circuit Breaker with Cover
18
Figure 3 - Close up Front View of Powlvac-Nd MA Replacement Circuit Breaker
19
Figure 4 - Cam and Fundamental Linkage Positions
20
Figure 5 - Mechanical and Trip Linkages
21
Electrical Description
23
A) Charging Motor
23
B) Motor Cutoff Switch
23
C) Anti-Pump Relay
23
D) Operating Solenoids
23
E) Control Circuit
23
Racking MECHANISM
24
General Description
24
A) Interlocks
24
Circuit Breaker Racking Mechanism
24
A) Disconnected Position
25
B) Test Position
25
C) Connected Position
25
Circuit Breaker COMPARTMENT INTERFACES
25
Primary Disconnecting Contacts
26
Secondary Disconnecting Contacts
26
Mechanism Operated Cell (MOC) Switch
26
Truck Operated Cell (TOC) Switch
26
Ground Connection
27
Shutter Ramp
27
Vacuum Interrupter CONNECTIONS
27
OPERATING Solenoids
27
THE ANTI-Pump RELAY
27
MOTOR Cutoff SWITCH
27
Vacuum Interrupters
28
Installation
28
Receiving
28
Handling
28
Storage
28
PLACING the Circuit Breaker into SERVICE
29
High-Voltage Insulation Integrity
29
Vacuum Integrity
30
Table a - Field Dielectric Test Values
30
Control Voltage Insulation Integrity
31
Mechanical Operation Check
31
Electrical Operation Check
32
INSERTING the Circuit Breaker into the SWITCHGEAR Equipment
32
REMOVING the Circuit Breaker from the SWITCHGEAR Equipment
33
Maintenance
34
GENERAL Description
34
Introduction
34
Inspection and Cleaning
35
Mechanism Area
36
Mechanical Operation
36
Lubrication
36
Figure 6 - Lubrication
37
Figure 7 - Lubrication (Cont)
38
Table B - Lubrication
39
Closing Spring Removal
40
Figure 8 - Main Closing Spring Assembly Compressed for Removal
40
Figure 9 - Main Closing Spring Assembly Installed
40
Slow Closing of Mechanism
41
Figure 10 - Primary & Secondary Trip Prop Adjustment
41
Mechanism Adjustments
42
A) Adjustment of Ratchet Wheel Holding Pawl
42
B) Adjustment of Primary Trip Prop
42
C) Tripping System Adjustment
43
Figure 11 - Feeler Gauge
44
D) Latch Check Switch Adjustment
45
Figure 12 - Latch Check Switch Adjustment
45
E) Adjustment of Close Latch Shaft
46
F) Open and Close Spring Release Lever Adjustment
46
Electrical Operation
46
Vacuum Interrupter and CONTACT AREA
46
Vacuum Interrupter and Contact Erosion
46
Figure 13 - Primary Current Path
47
Table C - Primary Current Path
47
Figure 14 - Control Devices
48
Table D - Control Devices
48
Table E - Miscellaneous Parts
49
Sliding Contact Finger Wear
50
Vacuum Integrity
50
Mechanical Adjustment of Vacuum Interrupters
50
OPTIONAL MAINTENANCE Procedures
50
High Potential Tests
50
Timing
51
Primary Resistance Check
51
Recommended Renewal Parts and Repair Procedures
51
Ordering Instructions
51
Table F - Timing
51
Table G - Primary Resistance
51
Recommended RENEWAL PARTS
52
REPLACEMENT Procedures
52
Vacuum Interrupter Assembly
52
Closing Coil Assembly
54
Primary Shunt Trip Coil Assembly
55
Secondary Shunt Trip Coil Assembly
55
Undervoltage Device Assembly
56
Charging Motor Assembly
56
Anti-Pump Relay Assembly
56
Latch Check Switch
57
Motor Cutoff Assembly
57
Auxiliary Switch
58

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