Siemens 38-3AH3 38 kV instruction manual Closing

Page 28

Vacuum interrupter/ operator

Figure 21: Operator sequential operation diagram

Closing

Closed

 

 

voltage applied.

Anti-pumping feature (52Y) assures a continuously applied closing command does not

 

 

cause the circuit breaker to reclose automatically after it has tripped out on a fault.

 

 

 

 

Undervoltage device

 

 

Spring-charge motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continuous

 

27 picks up.

 

 

(88.0) energized.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

closing command.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Closing spring is fully

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

charged.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Close coil (52SRC)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

unlatches the closing

 

LS21 and LS22

 

 

L3 opens in series

 

 

 

 

LS4 closes to signal

 

 

LS9 closes close

 

 

 

spring and the circuit

 

operate to de-

 

 

with anti-pump relay

 

 

 

 

closing spring is

 

 

circuit only when

 

 

 

breaker closes.

 

energize spring-

 

 

(52Y).

 

 

 

 

 

 

charged.

 

 

closing spring is fully

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

charging motor.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

charged.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Motor cutoff

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

switches LS21, LS22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

circuit

circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

and LS3 are closed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

because the closing

 

 

 

breaker is

breaker is

 

 

 

 

 

 

 

 

 

 

 

 

 

No action! Open 52b

Close coil is actuated

 

 

 

 

 

 

 

spring is discharged.

 

in series with close

closed.

open.

 

through the closed

 

 

 

 

 

 

 

 

 

 

coil (52SRC) blocks

 

 

 

Closing

 

 

 

 

 

 

52b contacts and the

 

 

 

 

 

 

 

 

 

 

 

 

 

command

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

closing spring-

 

 

 

 

 

 

 

 

two normally closed

 

 

 

 

 

 

 

Before the spring-

 

 

 

 

when

 

 

 

 

 

 

 

 

 

 

 

 

 

 

release.

 

 

 

 

 

 

 

 

 

contacts of the anti-

 

 

 

 

 

 

 

charge motor has

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

closing

 

pump relay (52Y).

 

 

 

 

 

 

 

recharged the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

closing spring and

 

 

 

 

 

 

 

spring is not

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

opened LS3, anti-

 

 

 

 

 

 

 

charged.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pump relay (52Y)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

picks up and seals in.

 

 

 

 

 

No action! Anti-

 

 

 

 

The closing spring is

 

 

The opening spring

 

 

 

 

 

pump relay (52Y)

 

 

 

unlatched.

 

 

is charged.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

picks up through the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

closed LS3 contact

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The anti-pump relay

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(52Y) opens two

 

 

 

 

 

and opens.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

contacts in series

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

with the close coil

 

52a contacts in

 

 

Circuit breaker

 

 

 

 

 

 

The circuit breaker

 

 

LS21 and LS22 close

 

 

 

(52SRC).

 

series with the trip

 

 

auxiliary contacts

 

 

 

 

closes.

 

 

 

 

 

 

to energize motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

coil (52T) close to

 

 

52a and 52b change

 

 

 

 

 

 

 

 

 

 

 

(88). LS3 closes and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

enable a trip

 

 

state.

 

 

 

 

 

 

 

 

 

 

 

 

 

LS4 opens to cancel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The close coil

 

opertion.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

closing spring signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(52SRC) is now

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

blocked and cannot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

be activated until

 

Rapid auto-reclosing. The closing spring is automatically recharged as described above.

 

springs are fully-

 

Therefore, when the circuit breaker is closed both of its springs are charged. The closing spring

 

charged and close

 

charges the opening spring during closing. As a result, the circuit breaker is capable of an

 

command is

 

O-0.3s-CO-3 min-CO operating cycle. The dashed line shows the operating sequence initiated by

 

removed.

 

the closing command.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tripping

 

 

 

 

 

 

 

 

 

 

 

Trip

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

command.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trip coil (52T) can

 

 

Undervoltage device (27) is

 

Undervoltage device (27) is activated

 

Secondary shunt-

 

only be activated

 

 

activated by opening a NC

 

by closing NO contact, shorting the

 

 

release (dual-trip)

 

when in series

 

 

contact in series with 27 or by

 

27 coil. The NO contact is only

 

 

function activated by

 

connected 52a

 

 

loss or reduction of tripping

 

effective with the circuit breaker

 

 

remote trip

 

contact is closed.

 

 

voltage.1

 

 

 

 

 

 

 

 

closed. Resistor required.1

 

 

command contact

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trip coil (52T)

 

 

 

 

 

 

 

 

 

Undervoltage device

 

 

 

 

 

 

 

 

 

Secondary release

 

unlatches the

 

 

 

 

 

 

 

 

 

27 unlatches the

 

 

 

 

 

 

 

 

unlatches the

 

opening spring.

 

 

 

 

 

 

 

 

 

opening spring.1

 

 

 

 

 

 

 

 

opening spring.1

Circuit breaker trips.

Footnote:

1Optional items.

28

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Contents Answers for energy Qualified person Table of contents Introduction Signal words Hazardous ProceduresIntroduction Field service operation and warranty issues IntroductionReceiving, handling and storage Introduction Receiving procedureShipping damage claims Handling procedure Receiving, handling and storageStorage procedure Indoor storageOutdoor storage Space heatingInspections, checks and tests without control power Installation checks and functional testsDe-energizing control power in switchgear Installation checks and functional tests Racking crank engagement procedure Type 38-3AH3 vacuum circuit breaker rackingPhysical inspections Manual-spring charging checkFinal mechanical inspections without control power Split-plug jumper connected to circuit breakerVacuum interrupter/ operator Vacuum interrupter/ operator Vacuum interruptersPrimary disconnects Phase barriersStored-energy operating mechanism Interrupter/operator module ConstructionCurrent-path assembly Switching operationCircuit-breaker pole Vacuum interrupterType 38-3AH3 vacuum circuit breaker pole section Stored-energy operating mechanism Auxiliary switch Mode of operationOperating mechanism Indirect releases tripping coilsClosing Use of manual-spring operation crankTrip-free functionality OpeningRapid 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 Indirect releases dual-trip or Undervoltage optionalSecondary shunt release optional 54.2Position a locked Shock absorber Capacitor-trip deviceSecondary disconnect Mechanism-operated cell MOC switch optional Truck-operated cell TOC switchShutter-operating linkage Secondary disconnect Shutters Trip-free interlock Rating interlockCircuit-breaker frame Ground disconnectRacking mechanism Vehicle function and operational interlocksAlignment Interlocks Circuit breaker racking-interlocksRacking interlocks Closed circuit breaker interlock Automatic closing-spring energy release Trip-free interlock position mechanical interlock Maintenance Introduction and maintenance intervalsMaintenance Recommended hand toolsRecommended maintenance and lubrication Inspection items and testsChecks of the primary power path Removal from switchgearCleanliness check Maintenance and lubrication Circuit NumberInspection of primary disconnects Checks of the stored-energy operator mechanismTypical for all three-phases Fastener check Manual-spring charging and contact- erosion checksWiring and terminals check Automatic spring-charging check control power requiredElectrical-control checks Secondary-disconnect checkTypical vacuum interrupter contact curve Spring-charging motor checks Vacuum-interrupter mechanical checkHigh-potential tests Vacuum-integrity check using dielectric testHigh-potential test voltages Field-test voltage Voltage Frequency withstandInspection and cleaning of circuit- breaker insulation Continuous ContactRating a Functional testsReplacement at overhaul OverhaulCircuit-breaker overhaul Circuit breaker Number TypeVacuum interrupter replacement OverhaulSetting Vacuum interrupter replacement illustration Overhaul Checking the contact stroke Open the circuit breaker Hydraulic shock absorberMaintenance and troubleshooting Sub-assembly Inspect forMaintenance and troubleshooting Problem Symptoms Possible causes and remediesClosed Appendix Appendix Permissible tripping delay Y Maximum design voltageValues Voltage Voltage range factor K3 Insulation Withstand Voltage levels Lightning-impulse BILRated Maximum design voltage Levels Voltage levels Lightning-impulse BILRated 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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