Siemens 38-3AH3 38 kV instruction manual Electrical-control checks, Wiring and terminals check

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Maintenance

Hazardous voltage and high-speed moving parts.

Will cause death, serious injury and property damage.

Read instruction manuals, observe safety instructions and use qualified personnel.

Electrical-control checks

The electrical controls of the type 38-3AH3 vacuum circuit breaker should be checked during inspection to verify absence of any mechanical damage, and proper operation of the automatic-spring charging and close and trip circuits.

Unless otherwise noted, all of these tests are performed without any control power applied to the circuit breaker.

Wiring and terminals check

1.Physically check all of the circuit- breaker wiring for evidence of abrasion, cuts, burning or mechanical damage.

2.Check all terminals to be certain they are solidly attached to their respective device.

Secondary-disconnect check

In addition to checking the terminals of the secondary disconnect, the secondary contact fingers need to be free to move without binding. Depress each finger, confirm presence of spring force (contact pressure) and verify freedom-of-motion.

Automatic spring-charging check (control power required)

Repeat the automatic spring-charging check described in "Installation checks and initial functional tests" (refer to pages 12-13).

Primary tasks of this check are:

1.The circuit breaker is energized with control power for this check.

2.De-energize the source of control power.

3.Install the circuit-breaker end of the split-plug jumper over the secondary disconnect of the circuit breaker. The split-plug jumper has one male and one female connector and cannot be installed incorrectly (refer to Figure 5: Split-plug jumper connected to circuit breaker on page 13).

4.Install the switchgear end of the split- plug jumper over the secondary- disconnect block inside the switchgear (refer to Figure 6: Split-plug jumper connected to switchgear on page 13).

5.Energize the control-power source.

6.When control power is connected to the circuit breaker, the closing springs should automatically charge. Visually verify the closing springs are CHARGED.

Note: A temporary source of control power and test leads may be required if the control-power source has not been connected to the switchgear. When control power is connected to the type 38-3AH3 vacuum circuit breaker, the closing springs should automatically charge.

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Contents Answers for energy Qualified person Table of contents Introduction Signal words Hazardous ProceduresIntroduction Introduction Field service operation and warranty issuesShipping damage claims Introduction Receiving procedureReceiving, handling and storage Receiving, handling and storage Handling procedureSpace heating Storage procedureIndoor storage Outdoor storageDe-energizing control power in switchgear Installation checks and functional testsInspections, checks and tests without control power Installation checks and functional tests Type 38-3AH3 vacuum circuit breaker racking Racking crank engagement procedureManual-spring charging check Physical inspectionsSplit-plug jumper connected to circuit breaker Final mechanical inspections without control powerVacuum interrupter/ operator Vacuum interrupters Vacuum interrupter/ operatorStored-energy operating mechanism Phase barriersPrimary disconnects Construction Interrupter/operator moduleVacuum interrupter Current-path assemblySwitching operation Circuit-breaker poleType 38-3AH3 vacuum circuit breaker pole section Stored-energy operating mechanism Indirect releases tripping coils Auxiliary switchMode of operation Operating mechanismUse of manual-spring operation crank ClosingManual operation Trip-free functionalityOpening Rapid auto-reclosing62.2 62.5.2 50.3.1 53.0 Pawl roller 62.5.2 Close-latch pawl Vacuum interrupter/ operator Discharged Closing Standard 54.2 Indirect releases dual-trip orUndervoltage optional Secondary shunt release optionalPosition a locked Secondary disconnect Capacitor-trip deviceShock absorber Truck-operated cell TOC switch Mechanism-operated cell MOC switch optionalShutter-operating linkage Secondary disconnect Shutters Ground disconnect Trip-free interlockRating interlock Circuit-breaker frameInterlocks Circuit breaker racking-interlocks Racking mechanismVehicle function and operational interlocks AlignmentRacking interlocks Closed circuit breaker interlock Automatic closing-spring energy release Trip-free interlock position mechanical interlock Introduction and maintenance intervals MaintenanceRecommended hand tools MaintenanceInspection items and tests Recommended maintenance and lubricationCleanliness check Removal from switchgearChecks of the primary power path Checks of the stored-energy operator mechanism Maintenance and lubricationCircuit Number Inspection of primary disconnectsTypical for all three-phases Manual-spring charging and contact- erosion checks Fastener checkSecondary-disconnect check Wiring and terminals checkAutomatic spring-charging check control power required Electrical-control checksTypical vacuum interrupter contact curve Vacuum-interrupter mechanical check Spring-charging motor checksHigh-potential test voltages Vacuum-integrity check using dielectric testHigh-potential tests Voltage Frequency withstand Field-test voltageFunctional tests Inspection and cleaning of circuit- breaker insulationContinuous Contact Rating aCircuit breaker Number Type Replacement at overhaulOverhaul Circuit-breaker overhaulOverhaul Vacuum interrupter replacementSetting Vacuum interrupter replacement illustration Overhaul Hydraulic shock absorber Checking the contact stroke Open the circuit breakerSub-assembly Inspect for Maintenance and troubleshootingProblem Symptoms Possible causes and remedies Maintenance and troubleshootingClosed Appendix Appendix Voltage levels Lightning-impulse BIL Permissible tripping delay YMaximum design voltage Values Voltage Voltage range factor K3 Insulation WithstandShort-circuit at rated maximum design voltage I5, 6 Rated Maximum design voltageLevels Voltage levels Lightning-impulse BIL Rated Continuous4Remarks Appendix

38-3AH3 38 kV specifications

The Siemens 38-3AH3 is a high-voltage circuit breaker designed for medium voltage applications, particularly in substations and industrial environments. This device operates at a voltage level of 38 kV, showcasing Siemens' commitment to innovation and reliability in electrical engineering.

One of the main features of the Siemens 38-3AH3 is its advanced interruption technology, which employs the proven hybrid design combining both gas-insulated and air-insulated technologies. This hybrid approach not only enhances the breaker's performance and reliability but also minimizes its footprint, making it an ideal choice for space-constrained environments.

The Siemens 38-3AH3 uses vacuum interruption technology, allowing for efficient switching with minimal wear and tear. The vacuum interrupters are highly reliable and provide excellent performance under various operating conditions. This technology ensures that the circuit breaker can handle short circuits and overloads effectively, thus protecting the entire electrical system.

Additionally, the Siemens 38-3AH3 incorporates intelligent monitoring systems. These digital technologies provide real-time data on breaker status, operational performance, and maintenance needs. This predictive maintenance capability helps operators to identify potential issues before they develop into significant problems, ultimately leading to reduced downtime and maintenance costs.

Another notable characteristic of the Siemens 38-3AH3 is its high insulation strength. Thanks to its robust design and development, this circuit breaker can withstand adverse environmental conditions, making it suitable for use in diverse geographical locations and climates. Its components are designed to resist contamination and corrosion, ensuring long-term reliability.

The Siemens 38-3AH3 also offers enhanced safety features. It includes protective relays and automatic fault detection systems that isolate faults quickly, preventing damage to downstream equipment. Furthermore, the design allows for easy maintenance, with components that are accessible without the need for extensive disassembly.

In summary, the Siemens 38-3AH3 38 kV circuit breaker is a leading solution in high-voltage protection and control, characterized by its advanced interruption technology, integrated monitoring systems, high insulation strength, and user-friendly maintenance features. Its innovative design and engineering make it a trusted choice for utilities and industrial facilities aiming to enhance the reliability and safety of their electrical systems.
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