Siemens vacuum circuit breaker 38-3AH3 38 kV User Manual

Answers for energy. Type 38-3AH3 38 kV vacuum circuit breaker instruction manualInstallation operation maintenance E50001-F710-A238-V1-4A00

Installation checks and functional testsRemoval from cell in outdoor non-walk-in enclosures or for indoor switchgear installed on a raised padRemoval

Installation checks and functional tests5. Move the circuit-breaker release latch (on the floor of the cell near the right side of the circuit brea

Installation checks and functional testsThe suggested procedure to engage the racking mechanism is as follows:1. The circuit breaker must be OPEN.

Installation checks and functional testsNote: Secondary-disconnect terminals are numbered 1-16, from right to left.The automatic spring-charging featu

Vacuum interrupter/ operatorFigure 8: Front view of type 38-3AH3 vacuum circuit breaker with front panel removedCHARGED/DISCHARGED indicatorOPEN/CLOSE

Vacuum interrupter/operatorIntroductionThe type 38-3AH3 vacuum circuit breaker is of drawout construction designed for use in medium-voltage, metal-cl

Vacuum interrupter/ operatorPrimary disconnectsFigure 10: Upper and lower primary disconnects (outer-phase barrier removed) is a side view of the circ

Vacuum interrupter/operatorFigure 11: Type 38-3AH3 vacuum circuit breaker with inter-phase and outer-phase barriers installed20.040.0Figure 12: Interr

Vacuum interrupter/operatorThe OPEN/CLOSED indicator (58.0), CHARGED/DISCHARGED indicator (55.0) and the operations counter (59.0) are located on the

Vacuum interrupter/operatorFigure 14: Type 38-3AH3 vacuum circuit breaker pole section27.016.0 - Insulator20.0 - Pole head27.0 - Upper-connection term

ImportantThe information contained herein is general in nature and not intended for specific application purposes. It does not relieve the user of res

Vacuum interrupter/operatorFigure 15: Stored-energy operating mechanism50.1 - Manual-spring charging port50.2 - Charging-mechanism gear box50.3

Vacuum interrupter/operatorWhen a tripping command is given, the energy stored in the tripping- and contact-pressure springs is released by pawl (64.2

When the closing spring has been fully charged, the crank actuates the linkage (55.1) via control lever (55.2) for the closing-spring CHARGED indicato

Vacuum interrupter/operatorTrip-free functionality Refer to Figure 15: Stored-energy operating mechanism on page 20, Figure 17: Operating mechanism se

Vacuum interrupter/operatorFigure 17: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism OPEN, closing spring DISCHARGED

Vacuum interrupter/operatorFigure 18: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism OPEN, closing spring DISCHARGED

Vacuum interrupter/operatorFigure 19: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism CLOSED, closing spring DISCHARGE

Vacuum interrupter/operatorFigure 20: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism CLOSED, closing spring CHARGED

Vacuum interrupter/operatorFigure 21: Operator sequential operation diagramClosed voltage applied.Undervoltage device 27 picks up.Spring-charge motor

Vacuum interrupter/operatorFigure 22: Typical elementary diagram88.0 - Spring-charging motor52a - Auxiliary switch is open when circuit breake

Table of contentsIntroduction 4 - 5Receiving, handling and storage 6 - 8Installation checks and functional tests 9 - 13Vacuum interrupter/operator

Vacuum interrupter/operatorFigure 23: Construction of secondary shunt release (shown charged)23.01.0 - Magnet core3.0 - Housing6.0 - Mounting ho

Vacuum interrupter/operatorFigure 25: Undervoltage lock/operate selectionFigure 26: Capacitor-trip device23.0 - Striker pin29.0 - ScrewPosition A: loc

Vacuum interrupter/operatorWhen this happens, the latch (25.0) loses its support and releases the striker pin (23.0), that is forced out by the spring

Vacuum interrupter/operatorFigure 30: MOC switch operating arm on a circuit breakerFigure 31: MOC (bottom) and TOC (top) switches and associated termi

Figure 33: Circuit-breaker compartment (MOC/TOC switch cover removed for photo)Vacuum interrupter/operator1. Shutter-operating linkage2. Shutter

Trip-free interlockFigure 32: Circuit-breaker interlocks and ground disconnect on page 33 shows the devices providing the trip-free interlock function

Vehicle function and operational interlocksA type 38-3AH3 vacuum circuit breaker is comprised mainly of the vacuum interrupter/operator module fitted

The two plates are mounted in alignment and must pass through each other in order for the circuit-breaker vehicle to enter the drawout compartm

Vacuum interrupter/operatorFigure 35: CLOSED circuit-breaker interlock mechanism in stored-energy mechanismClose-latch leverClosing-spring release cam

Vacuum interrupter/operator The spring-dump cam raises the spring-dump interlock upon insertion of the circuit breaker into the compartment

Caution (without safety alert symbol) - Indicates a potentially hazardous situation which, if not avoided, may result in property damage.Hazardous Pro

MaintenanceHazardous voltage and high-speed moving parts.Will cause death, serious injury and property damage.Do not by-pass interlocks or otherwise m

MaintenanceThe use of unauthorized parts in the repair of the equipment, or tampering by unqualified personnel can result in hazardous conditions, tha

MaintenanceInspection items and testsPrimary-power path checks Cleanliness check Inspection of primary disconnectsStored-energy operator-mechanism

MaintenanceRemoval from switchgearPrior to performing any inspection or maintenance checks or tests, the circuit breaker must be removed from the swit

Inspection of primary disconnectsFigure 38: Primary disconnect in mated position shows the primary-disconnect contact-fingers engaged. When the contac

MaintenanceFigure 39: Operator mechanism lubricationKlüber L32 or Klüber L32NTypical for all three-phases45

MaintenancePrimary-disconnect contacts (multi-fingered clusters) and secondary- disconnect contacts (strips and fingers) are to be wiped clean, and a

MaintenanceElectrical-control checksThe electrical controls of the type 38-3AH3 vacuum circuit breaker should be checked during inspection to verify a

MaintenanceFigure 41: Typical vacuum interrupter contact curve1251020100255031.540102050100200100,00050,00020,00010,0005,0002,0001,000500Permissible o

MaintenanceElectrical close and trip check (control power required)A check of the circuit-breaker control circuits is performed while the unit is sti

IntroductionField service operation and warranty issuesSiemens can provide competent, well trained field service representatives to provide technical

MaintenanceHigh-potential testsThe next series of tests (vacuum integrity and insulation) involve use of high-voltage test equipment. The circuit brea

MaintenanceVacuum-integrity test procedure1. Observe safety precautions listed in the DANGER and WARNING advisories. Construct the proper barrier a

Maintenance7. Connect all points of the secondary disconnect with a shorting wire. Connect the shorting wire to the high-potential lead of the high

OverhaulIntroductionThe following procedures along with the troubleshooting charts at the end of this section, provide maintenance personnel with a gu

Overhaul D. Solenoid mounting screws must be installed using thread locking adhesive (Loctite #222, Siemens part 15-133-281-007) and primer

Overhaul1.7 Remove bolt (31.2), lock washer and large washer at stationary contact of the vacuum interrupter (24 mm socket with extension). Careful

OverhaulFigure 46: Vacuum interrupter replacement illustration20.020.0 - Upper pole-support (pole-head)28.0 - Strut28.1 - Centering ring29.1 - Flexibl

Figure 47: Illustration showing required technique for fastening terminal-clamp hardwarePosition of torque wrench to avoid undue stressing of moving c

2.9 Tighten upper fastening bolt (31.2) on the upper pole-support (20.0) holding the vacuum interrupter firmly by its upper insulator and operate l

Maintenance and troubleshootingSub-assembly Item Inspect forPrimary power path Vacuum interrupter 1. Cleanliness.2. Contact erosion. Note: Perfo

Receiving, handling and storageIntroductionThis portion of the instruction manual covers the receiving, handling and storage instructions for a type 3

Maintenance and troubleshootingProblem Symptoms Possible causes and remediesCircuit breaker fails to close. Closing spring will not automatically char

Maintenance and troubleshootingProblem Symptoms Possible causes and remediesNuisance or false close Electrical problem 1. Nuisance or false closing

Control voltages, ANSI/IEEE C37.06Close coilTrip coilSpring charging motorNominal Range Run (Average)1 Inrush (Peak)ChargingClose Trip A1A1A A Second

AppendixContinuous current Circuit breaker typeA 38-3AH3-31 38-3AH3-40 38-3AH3-15001,200 800 (364) 850 (387) 800 (364)2,000 900 (409) 950 (432) 900 (4

AppendixMeasured parameter Units Circuit breaker type138-3AH3-31 38-3AH3-40General Nominal voltage class kV38.0 38.0Rated valuesRated voltageMaximum d

AppendixTable 13: Type 38-3AH3 vacuum circuit breaker ratings (historic "constant MVA" ratings basis)Measured parameter Units Circuit breake

AppendixTable 14: Remarks 66

AppendixTable 14: Remarks (continued) 67

www.usa.siemens.com/energyPublished by and copyright © 2010:Siemens AGEnergy SectorFreyeslebenstrasse 191058 Erlangen, GermanySiemens Energy, Inc.7000

4. Notify Siemens medium-voltage customer service immediately of any damage, at +1 (800) 347-6659 or +1 (919) 365-2200 outside the U.S.5. Arran

Receiving, handling and storageStorage procedure1. Whenever possible, install the circuit breaker in its assigned switchgear enclosure for storage.

Installation checks and functional testsIntroductionThis section provides a description of the inspections, checks and tests to be performed on the ci