The sales contract contains Overhaul 53 - 58 the entire obligation of Siemens Energy, Inc. The warranty contained in the contract between the parties is the sole warranty of Maintenance and troubleshooting 59 - 61 Siemens Energy, Inc.
The circuit breaker maintenance and use of the equipment. should be isolated, grounded and have all control power removed Contact the nearest Siemens before performing any tests, representative if any additional maintenance or repair. information is desired.
Introduction Field service operation and warranty issues Siemens can provide competent, well trained field service representatives to provide technical guidance and advisory assistance for the installation, overhaul, repair and maintenance of Siemens equipment, processes and systems. Contact regional service centers, sales...
Receiving, handling and storage Heavy weight. Improper lifting or hoisting can result in death, serious injury or property damage. Obtain the services of a qualified rigger prior to hoisting the circuit breaker to assure adequate safety margins in the hoisting equipment and procedures to avoid damage.
Siemens cannot be held liable for repairs. Siemens will not be held liable for repairs 6. Be sure the equipment is properly in any case where repair work was protected from any further damage by performed prior to authorization from covering it properly after unloading.
Receiving, handling and storage Storage procedure Manual spring-charging access port Manual close button 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.
Installation checks and functional tests Hazardous voltage and high-speed moving parts. Will cause death, serious injury and property damage. Read instruction manuals, observe safety instructions and use qualified personnel. Spring-discharge check (refer to Introduction Figure 1: Type 38-3AH3 vacuum circuit This section provides a description of the breaker front panel controls on page 8) inspections, checks and tests to be...
Installation checks and functional tests Heavy weight. Can result in death, serious injury or property damage. Observe all handling instructions in this instruction manual to prevent tipping or dropping of equipment. Removal from cell in indoor switchgear Removal from cell in outdoor non-walk- if not on raised pad and Shelter-Clad in enclosures or for indoor switchgear outdoor switchgear...
Siemens circuit-breaker lifting device or The racking crank consists of an offset Siemens lifting sling and a suitable handle with a custom socket assembly crane. welded to the end. The socket end of the crank is designed to engage the shoulder 7.
Installation checks and functional tests The suggested procedure to engage the Physical inspections racking mechanism is as follows: 1. Verify the rating of the circuit breaker is 1. The circuit breaker must be OPEN. (The compatible with both the system and racking shroud cannot be moved if the the switchgear.
(shown jumper slides into place and charged) on page 30) with a light film interconnects all control power and of Siemens contact lubricant number signal leads (for example, electrical trip 15-172-791-233. and close contacts) between the switchgear and the circuit breaker.
Vacuum interrupter/ operator Figure 8: Front view of type 38-3AH3 vacuum circuit breaker with front panel removed Gearbox Opening spring Secondary disconnect Push-to-close Closing spring Spring-charging Auxiliary motor behind switch limit switches CHARGED/ Close coil DISCHARGED Trip coil indicator Push-to-trip OPEN/CLOSED indicator Mechanism-...
Vacuum interrupter/ operator Introduction The type 38-3AH3 vacuum circuit breaker is of drawout construction designed for use in medium-voltage, metal-clad Fixed contact-current connection switchgear. The 38-3AH3 circuit breaker Ceramic insulator conforms to the requirements of ANSI and IEEE standards, including C37.20.2, C37.04, C37.06, C37.09 and C37.010.
Vacuum interrupter/ operator There are three insulating push rods. Each push rod connects the movable contact of one of the vacuum interrupters to the jack shaft driven by the closing and tripping mechanism. Flexible connectors provide secure electrical connections between the movable contacts of each vacuum interrupter and its bottom-primary disconnect.
Vacuum interrupter/ operator The vacuum circuit breaker consists of two sub-assemblies. The "interrupter/operator" module is a unitized assembly of the three vacuum interrupters, primary insulators and operating mechanism. The second module, the "vehicle", is the supporting drawout-structure module for the operating mechanism.
Vacuum interrupter/ operator Current-path assembly Refer to Figure 14: Type 38-3AH3 vacuum circuit breaker pole section on page 19. The current-path assembly consists of the upper terminal and pole support (20.0), the stationary contact (31.0) and the 53.0 moving contact (36.0), that is connected with the lower terminal (29.0) by terminal 55.0 54.0...
Vacuum interrupter/ operator When a tripping command is given, the If a make contact is used, the coil is energy stored in the tripping- and contact- shorted out, and a resistor must be used to pressure springs is released by pawl (64.2). limit the current.
Vacuum interrupter/ operator Closing Refer to Figure 15: Stored-energy operating mechanism on page 20, Figure 16: Use of manual-spring operating crank 50.1 53.0 on page 22, Figure 17: Operating mechanism section diagram (drawout trip- 50.0 free linkage shown) mechanism OPEN, closing spring DISCHARGED on page 24, 55.0 Figure 18: Operating mechanism section...
Vacuum interrupter/ operator Trip-free functionality Opening Refer to Figure 15: Stored-energy If the circuit breaker is to be tripped locally, operating mechanism on page 20, Figure the tripping spring (64.0) is released by pressing the trip button (54.0). In the case 17: Operating mechanism section diagram (drawout trip-free linkage shown) of an electrical command being given, the...
Vacuum interrupter/ operator Figure 19: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism CLOSED, closing spring DISCHARGED 62.5.2 - Close latch-pawl 62.8.1 - Spring-return latch 62.8.2 - Trip-free coupling link (draw bar) 62.8.3 - Trip-free coupling lever 62.8.5 - Push rod and cam assembly 62.8.6 - Interlock lever push rod 62.8.7 - Interlock lever actuator 62.8.8 - Trip-free actuator...
Vacuum interrupter/ operator Figure 20: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism CLOSED, closing spring CHARGED 62.5.2 - Close latch pawl 62.8.1 - Spring return latch 62.8.2 - Trip-free coupling link (draw bar) 62.8.3 - Trip-free coupling lever 62.8.5 - Push rod and cam assembly 62.8.6 - Interlock lever push rod 62.8.7 - Interlock lever actuator...
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.
Vacuum interrupter/ operator Figure 22: Typical elementary diagram SD16 SD13 LS21 Motor LS41 DC supply LS22 52SRC SD14 SD15 SD11 SD12 SD10 88.0 - Spring-charging motor MI1, MI2 - Mechanical interlock OI/C - Control switch (close) - Auxiliary switch is open when circuit breaker is open OI/T - Control switch (trip)
Vacuum interrupter/ operator Indirect releases (dual-trip or 21.0 25.0 27.0 undervoltage) (optional) The indirect release provides for the conversion of modest-control signals into 33.0 23.0 powerful mechanical-energy impulses. It is 31.0 primarily used to trip medium-voltage 11.0 circuit breakers while functioning as a 13.0 secondary (dual-trip) release or undervoltage-release device.
Vacuum interrupter/ operator Relay tripping may also be achieved by employing a normally open contact in Position A: locked 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. 23.0 Secondary and undervoltage releases are 29.0...
Vacuum interrupter/ operator When this happens, the latch (25.0) loses The capacitor trip includes a rectifier to its support and releases the striker pin convert the 120 or 240 Vac control voltage (23.0), that is forced out by the spring to a dc voltage that is used to charge a (31.0).
Vacuum interrupter/ operator 1. Ground disconnect 4. CLOSED circuit-breaker racking interlock 2. Spring-dump interlock 5. Circuit-breaker frame 3. Trip-free interlock 6. Rating interlock Figure 32: Circuit-breaker interlocks and ground disconnect Figure 30: MOC switch operating arm on a circuit breaker The auxiliary switch contains both "b"...
Vacuum interrupter/ operator Trip-free interlock Circuit-breaker frame Figure 32: Circuit-breaker interlocks and The frame of the type 38-3AH3 vacuum circuit breaker contains several important ground disconnect on page 33 shows the devices providing the trip-free interlock devices and features deserving of special function.
DISCONNECT, TEST and CONNECT module, providing mobility and fully positions. This mechanism contains a coordinated application in Siemens type circuit-breaker racking-block that mates GM38 switchgear. with the bottom of the circuit-breaker housing, and locks the circuit breaker to...
Vacuum interrupter/ operator 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.
Vacuum interrupter/ operator Figure 35: CLOSED circuit breaker interlock mechanism in stored- Close-latch lever energy mechanism shows the operating mechanism detail Closing-spring release cam components that establish a trip- free condition as the tube (4.0) Normal operating position rises. The rising tube raises a lever attached to the base of the operating-mechanism enclosure.
Vacuum interrupter/ operator The spring-dump cam raises the D. Trip-free interlock position - spring-dump interlock upon mechanical interlock insertion of the circuit breaker into In order to prevent the motor- the compartment, or upon charging circuit from "making and withdrawal from the compartment. breaking"...
Introduction and maintenance intervals Regardless of the length of the maintenance and lubrication interval, Periodic inspections and maintenance are Siemens recommends the circuit breaker essential to safe and reliable operation of should be inspected and exercised the type 38-3AH3 vacuum circuit breaker.
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 Metric: is not intended to cover reconditioning or Sockets and open-end wrenches:...
Purchaser's Automatic spring-charging check purposes, the matter should be referred to Electrical close and trip check Siemens at +1 (800) 347-6659 or +1 (919) 365-2200 outside the U.S. Vacuum-integrity check High-potential test Insulation test...
Maintenance Removal from switchgear Checks of the primary power path Prior to performing any inspection or The primary power path consists of three maintenance checks or tests, the circuit vacuum interrupters and three upper- and breaker must be removed from the three lower-primary disconnects.
Table 2: Maintenance and layer of Siemens contact lubricant lubrication schedule Check all components for evidence of (reference 15-172-791-233). excessive wear.
Maintenance Figure 39: Operator mechanism lubrication Klüber L32 or Klüber L32N Typical for all three-phases...
Contact erosion occurs when high-fault disconnect contacts (strips and fingers) are currents are interrupted or when the to be wiped clean, and a film of Siemens vacuum interrupter is nearing the limit contact lubricant (15-172-791-233) of its contact life. Determination of applied.
Maintenance Hazardous voltage and high-speed moving parts. Will cause death, serious injury and property damage. Read instruction manuals, observe safety instructions and use qualified personnel. Electrical-control checks Primary tasks of this check are: The electrical controls of the type 38-3AH3 1.
Maintenance Figure 41: Typical vacuum interrupter contact curve Note: Right-hand vertical segment of curve is located at the maximum symmetrical interrupting current rating of the circuit breaker as shown in Table 11: Circuit breaker operating times (type 3AH3 operator) on page 63 or Table 12: Type 38-3AH3 vacuum Permissible operating-cycles circuit breaker ratings (new "constant kA"...
Maintenance Electrical close and trip check Vacuum-interrupter mechanical check (control power required) Refer to Figure 42: Lower pole support A check of the circuit-breaker control with insulated coupler, Figure 43: Primary circuits is performed while the unit is still contact CLOSED and insulated coupler connected to the switchgear by the split- DISCONNECTED and Figure 44: CLOSED plug jumper.
Maintenance High-potential tests employ hazardous voltages. Will cause death and serious injury. Follow safe procedures, exclude unnecessary personnel and use safety barriers. Keep away from the circuit breaker during application of test voltages. Disconnect the split plug jumper from between the circuit breaker and switchgear before conducting high-potential tests.
Maintenance Table 3: High-potential test voltages Rated maximum- Rated power- Field-test voltage *Megger is a registered voltage frequency withstand trademark of Megger Group, Ltd. kV (rms) kV (rms) kV (rms) kV dc 38.0 Vacuum-integrity test procedure Insulation and contact-resistance test equipment 1.
Maintenance 7. Connect all points of the secondary Note: Do not use any cleaning compounds disconnect with a shorting wire. containing chlorinated hydrocarbons such Connect the shorting wire to the high- as trichlorethylene, perchlorethylene or potential lead of the high-voltage carbon tetrachloride.
Overhaul High-potential tests employ hazardous voltages. Will cause death, serious injury and property damage. Read instruction manual. All work must be performed with the circuit breaker completely de-energized and the springs discharged. Limit work to qualified personnel. Introduction Replacement at overhaul The following procedures along with the The following components are replaced troubleshooting charts at the end of this...
(Loctite #222, Siemens the bottom, or movable contact end, of part 15-133-281-007) and primer the vacuum interrupter. (Loctite primer T, Siemens part 15- The movable contact uses a metal bellows 133-281-005). to maintain the vacuum seal while still E. Connect wires to coils with new permitting up and down motion of the "push on"...
Overhaul 1.7 Remove bolt (31.2), lock washer and 2.3 Install the conductive spacer between large washer at stationary contact of the fixed (upper) terminal of the the vacuum interrupter (24 mm vacuum interrupter (30.0) and the socket with extension). Carefully note upper pole-support (20.0), with the location of the conductive spacer concave side of the spacer facing the...
Overhaul Figure 47: Illustration showing required technique for fastening terminal-clamp hardware Position of torque wrench to avoid undue stressing of moving contact (36.1) Vacuum interrupter Moving contact (36.1) Holding wrench Spacer (shoulder) (29.3) Terminal clamp (29.2) Torque wrench Direction of force (P)
Overhaul 2.9 Tighten upper fastening bolt (31.2) 3.5 Repeat the measurement described in on the upper pole-support (20.0) step 3.3 again with care to maximize holding the vacuum interrupter firmly accuracy. Record your result. by its upper insulator and operate 3.6 Determine difference between the levers (48.6) by hand to see whether measurements made under steps 3.3...
5. Motor cut-off switch LS21 or LS22 fails to operate. Replace if necessary. 6. 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. Closing springs Closing coil or solenoid 1.
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.
Appendix Table 12: Type 38-3AH3 vacuum circuit breaker ratings (new "constant kA" ratings basis) Measured parameter Units Circuit breaker type 38-3AH3-31 38-3AH3-40 General Nominal voltage class 38.0 38.0 Rated Rated Maximum design voltage (V) kV rms 38.0 38.0 values voltage Voltage range factor (K) ---- Insulation...
Appendix Table 13: Type 38-3AH3 vacuum circuit breaker ratings (historic "constant MVA" ratings basis) Measured parameter Units Circuit breaker type 38-3AH3-1500 General Nominal voltage class 38.0 Nominal three-phase MVA class 1500 Rated Rated Maximum design voltage (V) kV rms 38.0 values voltage Voltage range factor (K)
Replaces No. E50001-F710-A238-X-4A00 Printed in USA All rights reserved. Trademarks mentioned in this document are the property of Siemens AG, its affiliates, or their respective owners. Subject to change without prior notice. The information in this document contains general descriptions of the technical options available, which may not apply in all cases.