Page 2 - Hazardous voltages and high speed moving parts.
Important The information contained herein is general in nature and not intended for specific application purposes. It does not relieve the user of responsibility to use sound practices in application, installation, operation and maintenance of the equipment purchased. Siemens reserves the right to ...
Page 3 - Table of contents
Table of contents Introduction 4 - 5 Receiving, handling and storage 6 - 8 Installation checks and functional tests 9 - 13 Vacuum interrupter/operator 14 - 39 Maintenance 40 - 52 Overhaul 53 - 58 Maintenance and troubleshooting 59 - 61 Appendix 62 - 67 Note: These instructions do not purport to cove...
Page 4 - Introduction; Hazardous voltage and high-speed moving parts.
Caution (without safety alert symbol) - Indicates a potentially hazardous situation which, if not avoided, may result in property damage. Hazardous Procedures In addition to other procedures described in this instruction manual as dangerous, user personnel must adhere to the following: 1. Always wor...
Page 6 - The manner in which visible
Receiving, handling and storage Introduction This portion of the instruction manual covers the receiving, handling and storage instructions for a type 38-3AH3 vacuum circuit breaker shipped separately from the switchgear. This section of the instruction manual is intended to help the user identify, ...
Page 7 - Handling procedure
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. Arrange for a carrier inspection of the damage immediately. Important: Do not move the equipment from the place it was set when unloading. Also, do not remove or...
Page 8 - Storage procedure; Whenever possible, install the circuit; Indoor storage
Receiving, handling and storage Storage procedure 1. Whenever possible, install the circuit breaker in its assigned switchgear enclosure for storage. Follow instructions contained in the type GM38 38 kV metal-clad switchgear instruction manual, E50001-F710-A236-V1-4A00. 2. When the circuit breaker n...
Page 9 - Do not perform the spring-discharge
Installation checks and functional tests Introduction This section provides a description of the inspections, checks and tests to be performed on the circuit breaker prior to operation in the metal-clad switchgear. Inspections, checks and tests without control power Vacuum circuit breakers are norma...
Page 10 - Can result in death, serious injury or property damage.
Installation checks and functional tests Removal from cell in outdoor non-walk-in enclosures or for indoor switchgear installed on a raised pad Removal of the circuit breaker from a non-walk-in outdoor-switchgear assembly is similar to removal of a circuit breaker at floor level with several additio...
Page 11 - Racking crank engagement procedure
Installation checks and functional tests 5. Move the circuit-breaker release latch (on the floor of the cell near the right side of the circuit breaker) to the left and pull the circuit breaker out from the DISCONNECT position. The circuit breaker can now be removed from the cubicle and rolled out o...
Page 18 - Circuit-breaker pole; Current-path assembly
Vacuum interrupter/operator The OPEN/CLOSED indicator (58.0), CHARGED/DISCHARGED indicator (55.0) and the operations counter (59.0) are located on the front of the mechanism housing (60.0). Circuit-breaker pole Refer to Figure 14: Type 38-3AH3 vacuum circuit breaker pole section on page 19. The vacu...
Page 22 - Closing
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 indicator (55.0), and actuates the limit switches (50.4.1) for interrupting the motor supply. At the same time, the lever (62.5) at the other end of the charg...
Page 25 - * Items moved from position shown in
Vacuum interrupter/operator Figure 18: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism OPEN, closing spring DISCHARGED . 62.2 50.3.1 50.3 62.1 62.3 62.5 62.5.1 62.2.2 64.5* 54.1* 62.8* 64.2* 64.3* 63.5* 64.5* 63.0* 48.0* 63.5* 63.7* 63.5* 63.1* 48.0 - Insulating coupl...
Page 29 - 2T - Shunt trip coil
Vacuum interrupter/operator Figure 22: Typical elementary diagram 88.0 - Spring-charging motor 52a - Auxiliary switch is open when circuit breaker is open 52b - Auxiliary switch is closed when circuit breaker is closed 52SRC - Spring-release coil (close) 52T - Shunt trip coil 52Y - Closing relay (an...
Page 31 - Capacitor trip; release and undervoltage
Vacuum interrupter/operator Figure 25: Undervoltage lock/operate selection Figure 26: Capacitor-trip device 23.0 - Striker pin 29.0 - Screw Position A: locked Position B: unlocked (operating position) Cancel the lock for the undervoltage release by shifting the locking screw (29) from A to B. A B A ...
Page 32 - Capacitor-trip device; Shock absorber
Vacuum interrupter/operator When this happens, the latch (25.0) loses its support and releases the striker pin (23.0), that is forced out by the spring (31.0). On the undervoltage release 3AX1103, the latch (25.0) is held by the locking pin (21.0) as long as the armature (9.0) is attracted (energize...
Page 33 - Ground disconnect
Vacuum interrupter/operator Figure 30: MOC switch operating arm on a circuit breaker Figure 31: MOC (bottom) and TOC (top) switches and associated terminal blocks The auxiliary switch contains both "b" (normally closed) and "a" (normally open) contacts. When the circuit breaker is OP...
Page 35 - Rating interlock; Circuit-breaker frame
Trip-free interlock Figure 32: Circuit-breaker interlocks and ground disconnect on page 33 shows the devices providing the trip-free interlock function. The purpose of the trip-free interlock is to hold the circuit breaker operating-mechanism mechanically and electrically trip-free. The circuit brea...
Page 36 - The rating interlock consisting of a; Racking mechanism; They prevent racking a CLOSED circuit
Vehicle function and operational interlocks A type 38-3AH3 vacuum circuit breaker is comprised mainly of the vacuum interrupter/operator module fitted to a vehicle. This vacuum interrupter/operator module is an integral arrangement of operating mechanism, dielectric system, vacuum interrupters and m...
Page 37 - The two plates are mounted in; Racking interlocks
The two plates are mounted in alignment and must pass through each other in order for the circuit-breaker vehicle to enter the drawout compartment. The interlock is coded to test rated voltage, as well as interrupting and continuous current ratings. The circuit breaker must equal or exceed all of th...
Page 38 - release
Vacuum interrupter/operator Figure 35: CLOSED circuit-breaker interlock mechanism in stored-energy mechanism Close-latch lever Closing-spring release cam Normal operating position Trip-pushrod cam Trip-latch lever Trip-free pushrod Interlock levers Trip-pushrod cam Enclosure rear Spring-dump tube Re...
Page 39 - mechanical interlock
Vacuum interrupter/operator The spring-dump cam raises the spring-dump interlock upon insertion of the circuit breaker into the compartment, or upon withdrawal from the compartment. The interlock is raised at about the time the front wheels pass over the cubicle sill. It allows the spring-dump inter...
Page 40 - Maintenance; Introduction and maintenance intervals
Maintenance Hazardous voltage and high-speed moving parts. Will cause death, serious injury and property damage. Do not by-pass interlocks or otherwise make interlocks inoperative. Interlocks must be in operation at all times. Read instruction manuals, observe safety instructions and use qualified p...
Page 41 - Follow all safety instructions contained herein.; A preventive maintenance program; Recommended hand tools; Pliers
Maintenance The use of unauthorized parts in the repair of the equipment, or tampering by unqualified personnel can result in hazardous conditions, that can result in death, serious injury or property damage. Follow all safety instructions contained herein. Note: A preventive maintenance program is ...
Page 42 - Inspection items and tests
Maintenance Inspection items and tests Primary-power path checks Cleanliness check Inspection of primary disconnects Stored-energy operator-mechanism checks Maintenance and lubrication Fastener check Manual-spring charging check Contact-erosion check Electrical-control checks Wiring and terminals ch...
Page 43 - Removal from switchgear
Maintenance Removal from switchgear Prior to performing any inspection or maintenance checks or tests, the circuit breaker must be removed from the switchgear. The "Installation checks and initial functional tests" section (refer to page 8) describes the removal procedure in detail. The prin...
Page 44 - Circuit; operations
Inspection of primary disconnects Figure 38: Primary disconnect in mated position shows the primary-disconnect contact-fingers engaged. When the contacts are mated with the switchgear primary-stud assembly, there is forceful contact distributed over a wide area. This maintains low-current flow per i...
Page 45 - Typical for all three-phases
Maintenance Figure 39: Operator mechanism lubrication Klüber L32 or Klüber L32N Typical for all three-phases 45
Page 46 - Fastener check; Insert the hand-charging crank into the; Can result in serious injury.
Maintenance Primary-disconnect contacts (multi-fingered clusters) and secondary- disconnect contacts (strips and fingers) are to be wiped clean, and a film of Siemens contact lubricant (15-172-791-233) applied. Avoid getting contact lubricant on any insulating materials. Fastener check Inspect all f...
Page 47 - Electrical-control checks
Maintenance 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 t...
Page 48 - Permissible operating-cycles
Maintenance Figure 41: Typical vacuum interrupter contact curve 1 2 5 10 20 100 25 50 31.5 40 10 20 50 100 200 100,000 50,000 20,000 10,000 5,000 2,000 1,000 500 Permissible operating-cycles Breaking current symmetrical value Vacuum interrupters, types VS-30030 and VS-30041 21 19 (40 kA) 18 (31.5 kA...
Page 49 - Once the circuit-breaker springs are; Spring-charging motor checks; An appreciable closing force has to be
Maintenance Electrical close and trip check (control power required) A check of the circuit-breaker control circuits is performed while the unit is still connected to the switchgear by the split- plug jumper. This check is made with the circuit breaker energized by control power from the switchgear....
Page 50 - High-potential test voltages; Do not use dc high-potential testers; High-potential tests employ hazardous voltages.
Maintenance High-potential tests The next series of tests (vacuum integrity and insulation) involve use of high-voltage test equipment. The circuit breaker under test should be inside a suitable test barrier equipped with warning lights. Vacuum-integrity check (using dielectric test) A high-potentia...
Page 51 - Vacuum-integrity test procedure
Maintenance Vacuum-integrity test procedure 1. Observe safety precautions listed in the DANGER and WARNING advisories. Construct the proper barrier and warning light system. 2. Ground the frame of the circuit breaker, and ground each pole not under test. 3. Apply test voltage across each pole for on...
Page 52 - Functional tests; Continuous
Maintenance 7. Connect all points of the secondary disconnect with a shorting wire. Connect the shorting wire to the high-potential lead of the high-voltage tester and ground the circuit-breaker housing. Starting with zero volts, gradually increase the test voltage to 1,500 volts rms, 60 Hz. Maintai...
Page 53 - Overhaul; Auxiliary switch; Circuit breaker
Overhaul Introduction The following procedures along with the troubleshooting charts at the end of this section, provide maintenance personnel with a guide to identifying and correcting possible malfunctions of the type 38-3AH3 vacuum circuit breaker. Circuit-breaker overhaul Table 5 gives the recom...
Page 54 - Vacuum interrupter replacement
Overhaul D. Solenoid mounting screws must be installed using thread locking adhesive (Loctite #222, Siemens part 15-133-281-007) and primer (Loctite primer T, Siemens part 15-133-281-005). E. Connect wires to coils with new "push on" wire terminals (Siemens part 15-171-600-002). 3. Lubricate...
Page 58 - Hydraulic shock absorber
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 levers (48.6) by hand to see whether the movable contact moves freely. If any binding or lack of freedom is noted, loosen bolt (31.2) and adjust the vacuu...
Page 62 - Appendix
Control voltages, ANSI/IEEE C37.06 Close coil Trip coil Spring charging motor Nominal Range Run (Average) 1 Inrush (Peak) Charging Close Trip A 1 A 1 A A Seconds 48 Vdc 36 - 56 28 - 56 11.4 11.4/30 3 8 25 10 125 Vdc 100 - 140 70 - 140 2.1 4.8/7.4 3 4 18 10 250 Vdc 200 - 280 140 - 280 2.1 4.2/9.6 3 2...
Page 63 - Continuous current
Appendix Continuous current Circuit breaker type A 38-3AH3-31 38-3AH3-40 38-3AH3-1500 1,200 800 (364) 850 (387) 800 (364) 2,000 900 (409) 950 (432) 900 (409) 3,000 1,000 (455) 1,050 (478) 1,000 (455) Table 10: Type 38-3AH3 vacuum circuit breaker weight in lbs (kg) 1, 2, 3 Footnotes: 1. Weight estima...
Page 64 - These ratings are in accordance with:
Appendix Measured parameter Units Circuit breaker type 1 38-3AH3-31 38-3AH3-40 General Nominal voltage class kV 38.0 38.0 Rated values Rated voltage Maximum design voltage (V) 2 kV rms 38.0 38.0 Voltage range factor (K) 3 ---- 1.0 1.0 Insulation levels Withstand voltage levels Power-frequency kV rms...
