Type 38-3AH3 38 kV vacuum circuit breaker instruction manual Installation operation maintenance E50001-F710-A238-V1-4A00 Answers for energy.
Hazardous voltages and high speed moving parts. Will cause death, serious injury or property damage. Always de-energize and ground the equipment before maintenance. Read and understand this instruction manual before using equipment. Maintenance should be performed only by qualified personnel. The use of unauthorized parts in the repair of the equipment or tampering by unqualified personnel will result in dangerous conditions which will cause death, severe injury or equipment damage.
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 cover all details or variations in equipment, nor to provide for every possible contingency to be met in connection with installation, operation or maintenance.
Introduction Hazardous voltage and high-speed moving parts. Will cause death, serious injury and property damage. Always de-energize and ground the equipment before maintenance. Maintenance should be performed only by qualified personnel. The use of unauthorized parts in the repair of the equipment or by tampering by unqualified personnel will result in dangerous conditions that will cause death, severe injury or equipment damage. Follow all safety instructions contained herein.
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 offices or the factory for details, or telephone Siemens field service at +1 (800) 347-6659 or +1 (919) 365-2200 outside the U.S.
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. 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.
Receiving, handling and storage 4. N otify 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 disturb packaging or wrapping material prior to carrier damage inspection. Equipment must be inspected by carrier prior to handling after receipt.
Receiving, handling and storage Storage procedure Manual spring-charging access port Manual close button 1. W henever 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-F710A236-V1-4A00. 2.
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. 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.
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.
Installation checks and functional tests Heavy weight. Can result in death, serious injury or property damage. Do not transport a circuit breaker using a lift truck with the lift truck in the raised position. Figure 2: Type 38-3AH3 vacuum circuit breaker racking 5. M ove 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.
Installation checks and functional tests The suggested procedure to engage the racking mechanism is as follows: 1. T he circuit breaker must be OPEN. (The racking shroud cannot be moved if the circuit breaker is CLOSED.) 2. H old the socket-end of the crank in one hand and the crank handle in the other hand. 3. P lace the socket over the end of the racking-mechanism shaft. Align the socket with the shoulder on the racking-mechanism shaft.
Installation checks and functional tests Note: Secondary-disconnect terminals are numbered 1-16, from right to left. Final mechanical inspections without control power The automatic spring-charging features of the circuit breaker must be checked. Control power is required for automatic spring-charging to take place. 1. M ake a final mechanical inspection of the circuit breaker. Verify the contacts are in the OPEN position, and the closing springs are DISCHARGED. 1.
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 motor behind limit switches Auxiliary switch CHARGED/ DISCHARGED indicator Close coil Trip coil Push-to-trip OPEN/CLOSED indicator Mechanismoperated cell (MOC) switch operator Operations counter Capacitor trip (optional) Jack shaft 14 Closed circuitbreaker interlock Trip-free interlock Ground
Vacuum interrupter/ operator Introduction The type 38-3AH3 vacuum circuit breaker is of drawout construction designed for use in medium-voltage, metal-clad switchgear. The 38-3AH3 circuit breaker 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 53.0 54.0 55.0 58.0 59.0 Vacuum interrupter Refer to Figure 9: Vacuum interrupter cutaway view on page 15. The movingcontact (36.0) motion is aligned and stabilized by guide bushing (35.0). The metal bellows (34.0) follows the travel of contact (36.0) and seals the vacuum interrupter against the surrounding atmosphere. 53.0 - Manual close button 54.0 - Manual open (trip) button 55.0 - CHARGED/DISCHARGED indicator 58.0 - OPEN/CLOSED indicator 59.
Vacuum interrupter/ operator Figure 14: Type 38-3AH3 vacuum circuit breaker pole section 20.0 16.0 60.0 16.0 - Insulator 20.0 - Pole head 27.0 - Upper-connection terminal 28.0 - Strut 28.1 - Centering ring 27.0 31.2 29.0 - Lower-connection terminal 29.1 - Flexible connector 29.2 - Terminal clamp 30.0 - Vacuum interrupter 31.0 - Stationary contact 31.2 - Upper-terminal bolt 30.0 34.0 - Bellows (not shown) 31.0 36.0 28.0 35.0 - Guide bushing (not shown) 36.0 - Moving contact 36.3 - Eye bolt 40.
Vacuum interrupter/ operator Figure 15: Stored-energy operating mechanism 55.2 50.3 50.3.1 62.3 62.6 62.5 62.5.2 62.2 50.2 50.1 55.1 62.0 68.0 53.0 53.1 54.1 50.4.1 55.0 54.0 64.2 50.4 68.1 58.0 63.7 59.0 63.1 60.0 64.0 63.5 62.8 64.3 64.3.1 63.0 50.1 - Manual-spring charging port 55.0 - Spring-charge indicator 62.6 - Driver lever 50.2 - Charging-mechanism gear box 55.1 - Linkage 62.8 - Trip-free coupling rod 50.3 - Charging flange 55.2 - Control lever 63.0 - Jack shaft 50.3.
Vacuum interrupter/ operator When a tripping command is given, the energy stored in the tripping- and contactpressure springs is released by pawl (64.2). The opening sequence is similar to the closing sequence. The residual force of the tripping spring arrests the moving contact (36.0) in the OPEN (TRIPPED) position.
Vacuum interrupter/ operator Closing 50.1 53.0 50.0 55.0 54.0 50.0 - Hand crank 50.1 - Manual-spring charging port 53.0 - Manual close button 54.0 - Manual open (trip) button 55.0 - CHARGED/DISCHARGED indicator Figure 16: Use of manual-spring operation crank 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.
Vacuum interrupter/ operator Trip-free functionality Opening Refer to Figure 15: Stored-energy operating mechanism on page 20, Figure 17: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism OPEN, closing spring DISCHARGED on page 24, Figure 18: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism OPEN, closing spring DISCHARGED on page 25, Figure 19: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism CLOSED, closing spring
Vacuum interrupter/ operator Figure 17: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism OPEN, closing spring DISCHARGED 62.5.1 62.5 62.1 62.3 50.3 62.2 50.3.1 62.5.2 53.0 64.5* 62.6 62.2.2 53.1 64.2.2 64.0* 62.8.1 64.2.1 54.0 62.8.3 62.8.2 62.8* 64.2* * Items moved from position shown in Figure 63.5* 64.3.1* 62.8.5 64.5 63.0* 48.0* 63.5* 63.7 63.5 63.1 62.8.8 24 48.0 - Insulating coupler 50.3 - Charging flange 50.3.1 - Driver 53.
Vacuum interrupter/ operator Figure 18: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism OPEN, closing spring DISCHARGED . 48.0 - Insulating coupler 50.3 - Charging flange 50.3.1 - Driver 53.0 - Close pushbutton 53.1 - Close coil 52SRC 54.0 - Open pushbutton 54.1 - Trip coil 52T 62.1 - Charging shaft 62.2 - Crank 62.2.2 - Closing-spring mounting 62.3 - Cam disc 62.5 - Lever 62.5.1 - Pawl roller 62.5.2 - Close-latch pawl 62.6 - Drive lever 62.8 - Trip-free coupling rod 62.8.
Vacuum interrupter/ operator Figure 19: Operating mechanism section diagram (drawout trip-free linkage shown) mechanism CLOSED, closing spring DISCHARGED 62.5.1 62.5 62.1 62.2 62.5.2 62.3 53.0 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 63.1 - Lever - phase C 63.5 - Lever - phase B 63.
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 62.8.8 - Trip-free actuator 63.1 - Lever - phase C 63.5 - Lever - phase B 63.7 - Lever - phase A 64.0 - Opening spring 64.2.
Vacuum interrupter/ operator Figure 21: Operator sequential operation diagram Closing Closed voltage applied. Undervoltage device 27 picks up. 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. Spring-charge motor (88.0) energized. Continuous closing command. Closing spring is fully charged. LS21 and LS22 operate to deenergize springcharging motor.
Vacuum interrupter/ operator Figure 22: Typical elementary diagram (+) 01 T 01 C SD16 SD13 21 W 41 42 SD3 Motor 13 DC supply 22 88 21 LS41 14 31 32 21 LS22 22 MI1 21 TB 1 2 3 4 5 6 SD15 52b 21 52Y 22 52Y 31 52Y A1 22 A2 MI2 13 21 14 SD1 SD4 14 LS3 13 32 24 52b 23 52a A1 A1 52SRC 22 R G LS21 22 52T 52Y A2 SD14 A2 34 LS9 33 52a SD2 (-) SD11 54 55 SD9 64 52a 63 SD7 91 52a 92 SD12 101 52b 102 52b SD5 74 73 84 52a 83 SD8 SD10 88.
Vacuum interrupter/ operator 21.0 Indirect releases (dual-trip or undervoltage) (optional) 25.0 27.0 33.0 31.0 23.0 11.0 7.0 1.0 13.0 9.0 15.0 5.0 3.0 1.0 - Magnet core 15.0 - Tripping pin 3.0 - Housing 21.0 - Locking pin 6.0 - Mounting holes 23.0 - Striker pin 7.0 - Magnet coil 25.0 - Latch 9.0 - Magnet armature 27.0 - Spring 11.0 - Tension spring 31.0 - Striker-pin spring 13.0 - Adjusting (factory-set) screw for 11.0 33.
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 Secondary and undervoltage releases are available for all standard ANSI/IEEE control voltages.
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 (energized) (refer to Figure 21: Operator sequential operation diagram on page 28). If the circuit of the magnet coil (7.0) is interrupted, the armature (9.
Vacuum interrupter/ operator 6 5 4 3 2 1 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 The auxiliary switch contains both "b" (normally closed) and "a" (normally open) contacts. When the circuit breaker is OPEN, the "b" switches are closed and the "a" switches are open.
Vacuum interrupter/ operator Figure 33: Circuit-breaker compartment (MOC/TOC switch cover removed for photo) 7 5 13 1 9 8 10 2, 4, 6 3 1. Shutter-operating linkage 7. Secondary disconnect 2. Shutters 8. Trip-free padlock provisions 3. R acking mechanism padlock provisions 9. Current-transformer barrier 4. Primary disconnects (behind shutters) 12 34 2, 4, 6 10 9 11 10. Racking mechanism 11. Ground bar 5. MOC switch (optional) 12. Rating interlocks 6.
Vacuum interrupter/ operator Trip-free interlock Circuit-breaker frame 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 breaker is held trip-free during racking and whenever the circuit breaker is between the TEST and CONNECT positions within the switchgear enclosure.
Vacuum interrupter/ operator When circuit breakers are located above floor level, handling of the circuit breakers requires the use of a lifting device or a crane with a lift sling. Racking mechanism Figure 33: Circuit-breaker compartment (MOC/TOC switch cover removed for photo) on page 34 shows the racking mechanism in the switchgear used to move the circuit breaker among the DISCONNECT, TEST and CONNECT positions.
Vacuum interrupter/ operator he two plates are mounted in T 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 the cubicle ratings in order to enter the compartment. 2. Racking interlocks A.
Vacuum interrupter/ operator Close-latch lever Closing-spring release cam Normal operating position Trip-pushrod cam Trip-latch lever Enclosure rear Trip-free pushrod Retaining rings Trip-pushrod cam Interlock levers Spring-dump tube Figure 35: CLOSED circuit-breaker interlock mechanism in stored-energy mechanism he racking-cam profile on the T racking mechanism allows the tripfree racking-interlock to be in the lowest position (reset) only when the circuit breaker is in the TEST or the CONNECT posi
Vacuum interrupter/ operator he spring-dump cam raises the T 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. I t allows the spring-dump interlock to be in the reset (lowest) position at all other times.
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 personnel. Introduction and maintenance intervals Periodic inspections and maintenance are essential to safe and reliable operation of 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 is not intended to cover reconditioning or major repair, but should be designed to reveal, if possible, the need for such actions in time to prevent malfunctions during operation.
Maintenance Failure to maintain the equipment can result in death, serious injury, property damage or product failure, and can prevent successful functioning of connected apparatus. The instructions contained herein should be carefully reviewed, understood and followed. The maintenance tasks in Table 1 must be performed regularly.
Maintenance Removal from switchgear Checks of the primary power path 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 principal steps are repeated here for information and guidance, but without the details of the preceding section.
Maintenance Inspection of primary disconnects Maintenance and lubrication 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 individual contact finger. Table 2 gives the recommended maintenance intervals for circuit breakers.
Maintenance Figure 39: Operator mechanism lubrication Klüber L32 or Klüber L32N Typical for all three-phases 45
Maintenance Primary-disconnect contacts (multifingered clusters) and secondarydisconnect 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 fasteners for tightness. Both locknuts and retaining rings are used. Replace any fasteners that appear to have been frequently removed and replaced.
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 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. 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 circuit breaker ratings (new "constant kA" ratings basis) on page 64. Permissible operating-cycles 100,000 50,000 20,000 10,000 5,000 2,000 1,000 500 200 100 50 15 (21 kA) 18 (31.
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 splitplug jumper. This check is made with the circuit breaker energized by control power from the switchgear. 1. O nce the circuit-breaker springs are CHARGED, move the switchgearmounted close/trip switch to the CLOSE position.
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. Vacuum interrupters may emit X-ray radiation. Can result in serious injury.
Maintenance Table 3: High-potential test voltages Rated maximumvoltage Rated powerfrequency withstand kV (rms) kV (rms) kV (rms) kV dc 38.0 80 60 85 Vacuum-integrity test procedure 1. O bserve safety precautions listed in the DANGER and WARNING advisories. Construct the proper barrier and warning light system. 2. G round the frame of the circuit breaker, and ground each pole not under test. 3. A pply test voltage across each pole for one minute (circuit breaker OPEN). 4.
Maintenance 7. C onnect all points of the secondary disconnect with a shorting wire. Connect the shorting wire to the highpotential 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. Maintain test voltage for one minute. 8. I f no disruptive discharge occurs, the secondary-control insulation level is satisfactory.
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.
Overhaul D. S olenoid mounting screws must be installed using thread locking adhesive (Loctite #222, Siemens part 15-133-281-007) and primer (Loctite primer T, Siemens part 15133-281-005). E. C onnect wires to coils with new "push on" wire terminals (Siemens part 15-171-600-002). 3. L ubricate operating mechanism in accordance with instructions that follow. 4. W hen work is finished, operate circuit breaker, close/open several times, and check that all screw connections are tight.
Overhaul 1.7 R emove bolt (31.2), lock washer and large washer at stationary contact of the vacuum interrupter (24 mm socket with extension). Carefully note location of the conductive spacer between vacuum interrupter and pole support. This spacer has a concave surface that must be handled with care to avoid damage. 2.3 I nstall the conductive spacer between the fixed (upper) terminal of the vacuum interrupter (30.0) and the upper pole-support (20.
Overhaul Figure 46: Vacuum interrupter replacement illustration 20.0 - Upper pole-support (pole-head) 28.0 - Strut 28.1 - Centering ring 29.1 - Flexible connector 20.0 29.2 - Terminal clamp 31.2 29.3 - Spacer (or shoulder) 30.0 - Vacuum interrupter 31.2 - Upper terminal-bolt 36.1 - Moving terminal 36.3 - Eye bolt (or adapter) 40.0 - Lower pole-support (pole-bottom) 48.0 - Insulating coupler 48.5 - Pin 28.0 48.6 - Angled lever 48.9 - Drive link 30.0 36.1 28.1 29.3 29.2 29.1 36.3 40.0 48.6 48.5 48.
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.
Overhaul 2.9 T ighten 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 vacuum interrupter in pole support by turning the vacuum interrupter and moving it slightly. Torque M16 bolt to 91-101 ft-lb (123137 Nm). 2.10 The centering ring (28.
Maintenance and troubleshooting Table 6: Periodic maintenance and lubrication tasks Sub-assembly Item Inspect for Primary power path Vacuum interrupter 1. Cleanliness. 2. C ontact erosion. Note: Perform with manual-spring checks. 3. V acuum integrity. Note: Perform with high-potential tests. Primary disconnects 1. Burnt or damaged fingers. 2. Lubrication of contact surfaces. Vacuum interrupter operator mechanism Vacuum interrupter contact resistance 1.
Maintenance and troubleshooting Table 7: Troubleshooting Problem Symptoms Possible causes and remedies Circuit breaker fails to close. Closing spring will not automatically charge. 1. S econdary control circuit is de-energized or control circuit fuses are blown. Check and energize or replace if necessary. 2. S econdary disconnect contacts 15 or 16 are not engaging. Check and replace if required. 3. D amage to wiring, terminals or connectors. Check and repair as necessary. 4.
Maintenance and troubleshooting Table 7: Troubleshooting (continued) Problem Symptoms Possible causes and remedies Nuisance or false close Electrical problem 1. N uisance or false closing signal to secondary disconnect 13. Check protective relay logic. Correct as required. 2. C losing coil (52SRC) terminal A2 is shortedto-ground. Check to determine if problems are in wiring or coil. Correct as required. Circuit breaker will not trip Mechanical problem 1.
Appendix Table 8: Circuit breaker control data Control voltages, ANSI/IEEE C37.06 Nominal Close coil Trip coil Spring charging motor Range Run (Average)1 Inrush (Peak) Charging Close Trip A1 A1 A A Seconds 48 Vdc 36 - 56 28 - 56 11.4 11.4/303 8 25 10 125 Vdc 100 - 140 70 - 140 2.1 4.8/7.43 4 18 10 250 Vdc 200 - 280 140 - 280 2.1 4.2/9.63 2 10 10 120 Vac 104 - 127 ----4 2.0 ----2, 4 6 ----4 10 240 Vac 208 - 254 ----4 2.
Appendix Table 10: Type 38-3AH3 vacuum circuit breaker weight in lbs (kg)1, 2, 3 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) Footnotes: 1. Weight estimates are for circuit breaker only. Add 125 lbs (57 kg) for packaging. 2. Weight and dimensions are approximate.. 3.
Appendix Table 12: Type 38-3AH3 vacuum circuit breaker ratings (new "constant kA" ratings basis) Measured parameter General Rated values Rated voltage Insulation levels Rated current Related required capabilities Current Closing and latching (momentary) Units Nominal voltage class Maximum design voltage (V) Voltage range factor (K) Withstand voltage levels 2 38-3AH3-31 38-3AH3-40 kV 38.0 38.0 kV rms 38.0 38.0 ---- 1.0 1.
Appendix Table 13: Type 38-3AH3 vacuum circuit breaker ratings (historic "constant MVA" ratings basis) Measured parameter Units Circuit breaker type1 38-3AH3-1500 General Nominal voltage class kV 38.0 MVA 1500 kV rms 38.0 ---- 1.65 Power-frequency kV rms 80 Lightning-impulse (BIL) kV peak 150 A rms 1,200, 2,000, 3,000FC kA rms sym 21 Cycles/ms 5/83 Permissible tripping delay (Y) Sec 2 Rated maximum design voltage (V) divided by K = (V/K) kA rms 23.
Appendix Table 14: Remarks 66
Appendix Table 14: Remarks (continued) 67
Published by and copyright © 2010: Siemens AG Energy Sector Freyeslebenstrasse 1 91058 Erlangen, Germany Siemens Energy, Inc. 7000 Siemens Road Wendell, North Carolina 27591 USA For more information, contact +1 (800) 347-6659 Order No. E50001-F710-A238-V1-4A00 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.
