Siemens 38-3AH3 38 kV instruction manual Position a locked

Page 31

Vacuum interrupter/ operator

Relay tripping may also be achieved by employing a normally open contact in parallel with the holding coil. If this scheme is used, a resistor must be provided to limit current when the normally open contact is closed.

Position A: locked

23.0

A

Secondary and undervoltage releases are available for all standard ANSI/IEEE control voltages.

29.0

B

Construction and mode of operation of secondary release and undervoltage release

Position B: unlocked (operating position)

Refer to Figure 23: Construction of secondary shunt release (shown charged) and Figure 24: Latch details (shown

23.0

A

charged) on page 30 and Figure 25: Undervoltage lock/operate selection on page 31.

29.0

B

The release consists of a spring power- storing mechanism, a latching device and an electromagnet. These elements are accommodated side-by-side in a housing (3.0), with a detachable cover and three through-holes (5.0) for fastening screws. The supply leads for the trip coil are connected to a terminal block (33.0).

The energy-storing mechanism consists of the striker pin (23.0) and its operating spring (31.0), which is mostly located inside the striker pin (23.0). When the spring is compressed, the striker pin is held by a latch (25.0), whose sloping face is forced against the appropriately shaped striker pin (23.0) by spring (27.0). The other end of the latch (25.0) is supported by a partly-milled locking pin (21.0) (refer to Figure 24: Latch details (shown CHARGED) on page 30), that pivots in the cover sheets of the magnet armature (9.0). The armature (9.0) pivots in front of the poles of the U-shaped magnet core, (1.0) and is pulled away from it by the tension spring (11.0).

If the magnet coil (7.0) of the shunt release 3AX1101 is energized by a trip signal, or if the tripping pin (15.0) is mechanically actuated, magnet armature (9.0) is swung against the pole faces.

Cancel the lock for the undervoltage release by shifting the locking screw (29) from A to B.

23.0- Striker pin

29.0- Screw

Figure 25: Undervoltage lock/operate selection

01 T

 

SD5

 

 

 

24

 

 

 

52o

 

 

 

23

 

 

120 or 240 Vac

A1

 

Capacitor

(+)

 

supply

 

 

52T

(-)

1

 

A2

Resistor

 

 

 

34

 

2

 

52o

 

33

(+)

Rectifier

 

 

(-)

 

Capacitor trip

Figure 26: Capacitor-trip device

31

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Image 31
Page 30 Page 32
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 procedureSpace heating Storage procedureIndoor storage Outdoor storageInspections, 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 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 Shock absorber Capacitor-trip deviceSecondary disconnect 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 lubricationChecks of the primary power path Removal from switchgearCleanliness check 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 tests Vacuum-integrity check using dielectric testHigh-potential test voltages 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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