Siemens SINOVA - Page 188

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Inspection & Maintenance

4.7 Maintaining the main contact system

3WJ Air Circuit breakers

Operating Instructions, 12/2022, L1V30828903001-01

187

• Remove the screws and washers and then remove the contact carrier.

For 2000 A/2500 A versions: Also remove the spacer after removal of the contact carrier.

Main Page

Table of Contents4
Introduction7
Technical Support7
Safety Instructions8
Standards9
Transport9
Description11
Mechanical Components11
Design11
Circuit Breaker11
Guide Frame13
Circuit Breaker Identification14
Accessory and Rating Label14
Indicators of the Circuit Breaker16
Operation17
Installation17
Racking the Circuit Breaker in or out19
Position of the Circuit Breaker in the Guide Frame22
Removing the Circuit Breaker from the Guide Frame23
Inserting the Circuit Breaker into the Guide Frame24
Closing and Opening25
Commissioning Checklist29
Connection30
Main Connections30
Secondary Disconnect Terminals36
Connecting the Protective Conductor39
Electronic Components40
Electronic Trip Unit (ETU) - Functional Overview40
Etu350Wj42
Etu360Wj45
Indicators on the ETU49
Protection Functions51
Basic Protection Functions51
LT: Overload Protection (Long Time), L-Tripping51
ST: Short-Time Delay Short-Circuit Release (Short Time), S Tripping52
INST: Instantaneous Short-Circuit Release (Instantaneous), I-Tripping52
GF: Ground-Fault Protection (Ground-Fault), G-Tripping53
N: Neutral Conductor Protection (Neutral), N-Tripping53
Additional Functions53
Menus on the Displays of the ETU350WJ and ETU360WJ54
Recommissioning after Opening Operation by Electronic Trip Unit56
Accessories57
Overview57
Preparatory and Concluding Installation Steps for the Installation of Internal Accessories58
Control and Signaling Accessories61
Overview61
Closing Coil, Shunt Trip and Undervoltage Release62
Installation67
Part Number68
Counting Mechanism69
Monitoring Switches and Signaling Accessories71
Position Signaling Switch for Guide Frame71
Accessories for Main Connections73
Connection Bars for Guide Frame (Frame Size I)73
Connection Bars for Guide Frame (Frame Size II)77
Vertical Connections for Fixed-Mounted Circuit Breaker81
Accessories for Secondary Disconnect Terminals84
Secondary Disconnect Terminals for Fixed-Mounted Circuit Breakers84
Secondary Disconnect Terminals for Withdrawable Circuit Breakers86
Accessories for the Electronic Trip Unit87
Hand-Held Test Device87
External Transformer for Neutral Conductors (for ETU360WJ)92
Retrofitting the Internal N Transformer95
Conversion Sets - Fixed-Mounted Circuit Breakers to Withdrawable Circuit Breakers98
Accessories for Locking and Interlocking106
Safety Locking Device106
Mounting Set for 3WJ Lock or CASTELL Lock108
3WJ Lock (Set), 3 Locks with 2 Keys110
Door Interlock117
Door Interlock for Fixed-Mounted Circuit Breaker117
Door Interlock for Guide Frame120
Mechanical Interlock124
Information about Mechanical Interlock124
Mechanical Interlock of Fixed-Mounted Circuit Breakers130
Mechanical Interlock of Withdrawable Circuit Breakers135
Installing Bowden Wire139
Accessories for Integration in the Power Distribution Equipment142
Door Sealing Frame IP41142
Protective Cover IP55144
Arc Chute Cover145
Shutters149
Phase Barrier156
Phase Barrier for Fixed-Mounted Circuit Breaker157
Phase Barrier for Guide Frame162
Inspection & Maintenance166
General166
Safety Regulations168
Planning of Inspection and Maintenance169
Inspection Interval169
Scope169
Logging171
Performing Inspection172
General172
Visual Inspection172
Check of the Available Documentation and of the Rating/Accessory Label173
Testing of Mechanical Function of the Circuit Breaker173
Testing of Mechanical Function of the Withdrawable Circuit Breaker and the Guide Frame174
Testing of Auxiliary Circuits174
Testing of Mechanical and Electrical Function of Internal Accessories175
Testing of Settings and Inspection of the Electronic Trip Unit176
Inspection of Arc Chutes, Arc Chute Covers and Main Contact System177
Checking the Wear on the Contacts178
Preparation for Maintenance Work179
Maintaining the Arc Chutes181
Maintaining the Main Contact System182
Technical Specifications197
Circuit Diagrams197
Overall Circuit Diagram197
Terminal Connection Diagram of Secondary Disconnect Terminals199
Circuit Diagram for Undervoltage Release with Delay200
Dimension Drawings200
Fixed-Mounted Circuit Breakers200
Withdrawable Circuit Breakers203
Accessories 3 Pole / 4 Pole204
Door Cutout206
Current Transformer for N Conductor207
Troubleshooting208
Disposal210
ESD Guidelines211
List of Abbreviations213
Glossary216

Siemens SINOVA - Page 188

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