Siemens 38-3AH3 38 kV instruction manual Closed

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Maintenance and troubleshooting

Table 7: Troubleshooting (continued)

Problem

Symptoms

Possible causes and remedies

Nuisance or false close

Electrical problem

1.

Nuisance or false closing signal to secondary

 

 

 

disconnect 13. Check protective relay logic.

 

 

 

Correct as required.

 

 

2.

Closing coil (52SRC) terminal A2 is shorted-

 

 

 

to-ground. Check to determine if problems

 

 

 

are in wiring or coil. Correct as required.

 

 

 

 

 

Mechanical problem

1.

Mechanical failure of operating mechanism.

 

 

 

Check and contact regional service centers,

 

 

 

the factory or telephone Siemens field service

 

 

 

at +1 (800) 347-6659 or +1 (919) 365-2200

 

 

 

outside the U.S.

 

 

 

 

Circuit breaker will not trip

Tripping coil or solenoid (52T) does not

1.

Secondary control power is de-energized or

 

energize. There is no tripping sound.

 

control power fuses are blown. Correct as

 

 

 

indicated.

 

 

2.

Damage to wiring, terminals or connectors.

 

 

 

Check and repair as necessary.

 

 

3.

No tripping signal to secondary disconnect

 

 

 

contact 1. Check for continuity and correct

 

 

 

protective relay logic.

 

 

4.

Secondary disconnect contacts 1 or 2 are not

 

 

 

engaging. Check and replace if required.

 

 

5.

Failure of trip coil (52T). Check and replace if

 

 

 

necessary.

 

 

6.

Auxiliary switch NO contacts 23 to 24 or 33

 

 

 

to 34 are OPEN when circuit breaker is

 

 

 

CLOSED. Check linkage and switch. Replace

 

 

 

or adjust as necessary.

 

 

 

 

 

Tripping coil (52T) energizes. No tripping

1.

Failure of tripping spring or its mechanical

 

sound is heard, and circuit breaker contacts

 

linkage. Check and replace if required.

 

do not open. In other words, they remain

 

 

 

CLOSED.

 

 

 

 

 

 

 

Tripping coil (52T) energizes. Tripping sound

1.

Mechanical failure of operating mechanism.

 

is heard, but circuit breaker contacts do not

 

Check and contact regional service centers,

 

open.

 

the factory or telephone Siemens field service

 

 

 

at +1 (800) 347-6659 or +1 (919) 365-2200

 

 

 

outside the U.S.

 

 

2.

One or more of the vacuum interrupters are

 

 

 

held CLOSED. Check and replace as

 

 

 

necessary.

 

 

 

 

Nuisance or false trip

Electrical problem

1.

Tripping signal remains energized on

 

 

 

secondary-disconnect contact.

 

 

2.

Check for improper protective relay logic.

 

 

 

 

 

Mechanical problem

1.

Mechanical failure of operating mechanism.

 

 

 

Check and contact regional service centers,

 

 

 

the factory or telephone Siemens field service

 

 

 

at +1 (800) 347-6659 or +1 (919) 365-2200

 

 

 

outside the U.S.

 

 

 

 

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Contents Answers for energy Qualified person Table of contents Introduction Signal words Hazardous ProceduresIntroduction Introduction Field service operation and warranty issuesReceiving, handling and storage Introduction Receiving procedureShipping damage claims Receiving, handling and storage Handling procedureIndoor storage Storage procedureOutdoor storage Space heatingInspections, checks and tests without control power Installation checks and functional testsDe-energizing control power in switchgear 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/ operatorPrimary disconnects Phase barriersStored-energy operating mechanism Construction Interrupter/operator moduleSwitching operation Current-path assemblyCircuit-breaker pole Vacuum interrupterType 38-3AH3 vacuum circuit breaker pole section Stored-energy operating mechanism Mode of operation Auxiliary switchOperating mechanism Indirect releases tripping coilsUse of manual-spring operation crank ClosingOpening Trip-free functionalityRapid auto-reclosing Manual operation62.2 62.5.2 50.3.1 53.0 Pawl roller 62.5.2 Close-latch pawl Vacuum interrupter/ operator Discharged Closing Standard Undervoltage optional Indirect releases dual-trip orSecondary shunt release optional 54.2Position a locked Shock absorber Capacitor-trip deviceSecondary disconnect Truck-operated cell TOC switch Mechanism-operated cell MOC switch optionalShutter-operating linkage Secondary disconnect Shutters Rating interlock Trip-free interlockCircuit-breaker frame Ground disconnectVehicle function and operational interlocks Racking mechanismAlignment Interlocks Circuit breaker racking-interlocksRacking 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 lubricationChecks of the primary power path Removal from switchgearCleanliness check Circuit Number Maintenance and lubricationInspection of primary disconnects Checks of the stored-energy operator mechanismTypical for all three-phases Manual-spring charging and contact- erosion checks Fastener checkAutomatic spring-charging check control power required Wiring and terminals checkElectrical-control checks Secondary-disconnect checkTypical vacuum interrupter contact curve Vacuum-interrupter mechanical check Spring-charging motor checksHigh-potential tests Vacuum-integrity check using dielectric testHigh-potential test voltages Voltage Frequency withstand Field-test voltageContinuous Contact Inspection and cleaning of circuit- breaker insulationRating a Functional testsOverhaul Replacement at overhaulCircuit-breaker overhaul Circuit breaker Number TypeOverhaul 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 Maximum design voltage Permissible tripping delay YValues Voltage Voltage range factor K3 Insulation Withstand Voltage levels Lightning-impulse BILLevels Voltage levels Lightning-impulse BIL Rated Maximum design voltageRated Continuous4 Short-circuit at rated maximum design voltage I5, 6Remarks 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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