Siemens 38-3AH3 38 kV manual

Answers f or energy . T y pe 38-3AH3 38 kV vacuum cir cuit break er instr uction manual Installation operation maintenance E50001-F710-A238-V1-4A00[...]

Important The information contained her ein is general in nature and no t intended f or specific application purposes. It does not reliev e the user of responsibility to use sound practices in application, installation, operation and maintenance of the equipment purc hased. Siemens reserves the right to mak e changes in the specifications shown her[...]

Table of cont ents Introduction 4 - 5 Receiving, handling and storage 6 - 8 Installation checks and functional tests 9 - 13 Vacuum int errupter/operat or 14 - 39 Maintenance 40 - 52 Overhaul 53 - 58 Maintenance and troubleshoo ting 59 - 61 Appendix 62 - 67 Note : These instructions do not purport to cov er all details or variations in equipment, no[...]

Caution (without safety alert symbol) - Indicates a po tentially hazardous situation which, if not a voided, may r esult in property damage. Hazardous Procedures In addition to o ther procedur es described in this instruction manual as dangerous, user personnel must adhere to the follo wing: 1. Always wor k only on a de-energized circuit br eaker .[...]

Introduction Field service operation and warranty issues Siemens can pro vide compet ent, well trained field ser vice representatives t o pro vide technical guidance and advisory assistance for t he installation, overhaul, repair and maint enance of Siemens equipment, proces ses and systems. Contact regional service centers, sales offices or the fa[...]

Receiving, handling and stora ge Introduction This portion of the instruction manual covers the r eceiving, handling and s torage instructions for a type 38-3AH3 vacuum circuit br eaker shipped separat ely from the switchgear . This section of the instruction manual is intended t o help the user identify , inspect and prot ect the circuit break er [...]

4. Notify Siemens medium-v oltage 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 t he damage immediately . Important : Do not move t he equipment from the place it was se t when unloading. Also, do not r emove or disturb pack aging or wrapping material pr[...]

Receiving, handling and stora ge St orage procedure 1. Whenever pos sible, ins tall the circuit break er in its assigned switchgear enclosure f or storage. Follo w instructions contained in the type GM38 38 kV metal-clad switchgear instruction manual, E50001-F710- A236-V1-4A00. 2. When the circuit br eaker needs t o be placed on its pallet f or sto[...]

Inst allation chec k s and functional t ests Introduction This section pro vides a description of the inspections, checks and tests t o be performed on the circuit br eaker prior t o operation in the metal-clad switchgear . Inspections, checks and tests without control pow er Vacuum cir cuit breakers are normally shipped with their primary cont act[...]

Inst allation chec k s and functional t ests Removal from cell in outdoor non-w alk - in enclosures or for indoor switchgear installed on a raised pad Removal of the cir cuit break er from a non- walk -in outdoor-switchgear as sembly is similar to r emoval of a circuit br eak er at floor level wit h several additional st eps. Figure 3 sho ws the tw[...]

Inst allation chec k s and functional t ests 5. Move t he circuit-break er release latch (on the floor of the cell near the right side of the circuit br eaker) t o the lef t and pull the circuit br eaker out fr om the DISC ONNECT position. The circuit break er can now be removed fr om the cubicle and rolled out ont o the two extension rails. 6. Rem[...]

Inst allation chec k s and functional t ests The suggested pr ocedure t o engage the racking mechanism is as f ollows: 1. The circuit br eaker must be OPEN. (The racking shroud canno t be mov ed if the circuit br eaker is CL OSED.) 2. Hold the sock et-end of the crank in one hand and the crank handle in the ot her hand. 3. Place the sock et o ver t[...]

Inst allation chec k s and functional t ests Note: Secondary-disconnect terminals are numbered 1-16, fr om right to left. The automatic spring-char ging featur es of the circuit br eaker must be c heck ed. Control pow er is requir ed for aut omatic spring-charging t o take place. 1. Open control-pow er circuit by opening the control-po wer disconne[...]

V acuum int er r upt er/ operat or Figure 8: F ront view of type 38-3AH3 vacuum circuit br eaker with fr ont panel remov ed CHARGED/ DISCHARGED indicator OPEN/CLOSED indicator Operations counter Capacitor trip (optional) Jack shaft Closed circuit- break er interlock Spring-charging mot or behind limit switches T rip-free interlock Ground disconnect[...]

V acuum int er r upt er/ operat or Introduction The type 38-3AH3 vacuum circuit br eaker is of drawout construction designed f or use in medium-voltage, metal-clad switchgear . The 38-3AH3 circuit br eaker conforms t o the req uirements of ANSI and IEEE standards, including C37.20.2, C37.04, C37.06, C37.09 and C37.010. A type 38-3AH3 vacuum circuit[...]

V acuum int er r upt er/ operat or Primar y disconnects Figure 10: U pper and lower primary disconnects (outer -phase barrier removed) is a side view of the cir cuit break er with the outer -insulating phase barrier removed to show de t ails of the primary disconnects. Each circuit br eak er has three upper - and three low er -primar y disconnects.[...]

V acuum int er r upt er/ operat or Figure 11: T ype 38-3AH3 vacuum circuit br eaker with int er -phase and outer -phase barriers installed 20.0 40.0 Figure 12: Int errupter/operating mechanism module (sho wn with outer -phase barrier removed) 16.0 - Insulator 20.0 - Pole head 29.0 - Lower connection terminal 30.0 - Vacuum int errupter 40.0 - Pole b[...]

V acuum int er r upt er/ operat or The OPEN/CL OSED indicator (58.0), CHARGED/DISCHARGED indicator (55.0) and the operations counter (59.0) ar e located on the fr ont of the mechanism housing (60.0). Circuit-break er pole Refer t o Figure 14: T ype 38-3AH3 vacuum circuit br eaker pole section on page 19. The vacuum interrup ter (30.0) is rigidly co[...]

V acuum int er r upt er/ operat or Figure 14: T ype 38-3AH3 vacuum circuit br eaker pole section 27.0 16.0 - Insulator 20.0 - Pole head 27.0 - Upper -connection terminal 28.0 - Strut 28.1 - Centering ring 29.0 - Lower -connection terminal 29.1 - Flexible connector 29.2 - T erminal clamp 30.0 - Vacuum int errupter 31.0 - Stationary contact 31.2 - Up[...]

V acuum int er r upt er/ operat or Figure 15: S tored-energy operating mechanism 50.1 - Manual-spring charging port 50.2 - Charging-mechanism gear bo x 50.3 - Charging flange 50.3.1 - Driver 50.4 - Spring-charging mo tor (behind limit switches) 50.4.1 - Limit switches 53.0 - Close button 53.1 - Close coil 54.0 - Open button 54.1 - T rip coil 54.2 -[...]

V acuum int er r upt er/ operat or When a tripping command is given, the energy stor ed in the tripping- and contact- pres sure springs is released b y paw l (64.2). The opening sequence is similar to t he closing sequence. The residual f orce of the tripping spring arrests the mo ving contact (36.0) in the OPEN (TRIPPED) position. Operating mechan[...]

When the closing spring has been fully charged, t he crank actuates the linkage (55.1) via control le ver (55.2) f or the closing-spring CHARGED indicator (55.0), and actuates the limit switches (50.4.1) f or interrup ting the mot or supply . At the same time, t he lever (62.5) at the other end of the c harging shaft is securely lock ed by the clos[...]

V acuum int er r upt er/ operat or T rip-free functionality Refer t o Figure 15: S tored-energy operating mechanism on page 20, Figur e 17: Operating mechanism section diagram (drawout trip-fr ee linkage shown) mechanism OPEN, closing spring DISCHARGED on page 24, Figur e 18: Operating mechanism section diagram (drawout trip-fr ee linkage shown) me[...]

V acuum int er r upt er/ operat or Figure 17: Operating mechanism section diag ram (drawout trip-free link age 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 - T rip coil 52T 62.1 - Charging shaft 62.2 - Cra[...]

V acuum int er r upt er/ operat or Figure 18: Operating mechanism section diag ram (drawout trip-free link age 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 coupler 50.3 - Charging flange 50.3.1 - Driver[...]

V acuum int er r upt er/ operat or Figure 19: Operating mechanism section diag ram (drawout trip-free link age shown) mechanism CL OSED, closing spring DISCHARGED 62.5.2 - Close latch-pawl 62.8.1 - Spring-return latc h 62.8.2 - T rip-free coupling link (draw bar) 62.8.3 - T rip-free coupling lever 62.8.5 - Push rod and cam assembl y 62.8.6 - Interl[...]

V acuum int er r upt er/ operat or Figure 20: Operating mechanism section diag ram (drawout trip-free link age shown) mechanism CL OSED, closing spring CHARGED 62.5.2 - Close latch pawl 62.8.1 - Spring return latc h 62.8.2 - T rip-free coupling link (draw bar) 62.8.3 - T rip-free coupling lever 62.8.5 - Push rod and cam assembl y 62.8.6 - Interlock[...]

V acuum int er r upt er/ operat or Figure 21: Operat or sequential operation diagram Closed voltage applied. Undervoltage device 27 picks up. Spring-charge mo tor (88.0) energized. L3 opens in series with anti-pump rela y (52Y). LS21 and L S22 operate to de- energize spring- charging mo tor . LS4 closes to signal closing spring is charged. LS9 clos[...]

V acuum int er r upt er/ operat or Figure 22: T ypical elementary diagram 88.0 - Spring-charging mo tor 52a - Auxiliary switch is open when circuit break er is open 52b - Auxiliary switch is closed when circuit break er is closed 52SRC - Spring-release coil (close) 52T - Shunt trip coil 52Y - Closing rela y (anti-pump) G - Green indicating light (t[...]

V acuum int er r upt er/ operat or Figure 23: Construction of secondary shunt release (shown charged) 23.0 1.0 - Magnet core 3.0 - Housing 6.0 - Mounting holes 7.0 - Magnet coil 9.0 - Magnet armature 11.0 - T ension spring 13.0 - Adjusting (factory-set) screw for 11.0 Indirect releases (dual-trip or under voltage) (optional) The indirect r elease p[...]

V acuum int er r upt er/ operat or Figure 25: Undervoltage lock/operate selection Figure 26: Capacit or-trip de vice 23.0 - Strik er pin 29.0 - Screw Position A: lock ed Position B: unlock ed (operating position) Cancel the lock f or the under voltage release b y shifting the locking screw (29) fr om A to B. A B A B 23.0 29.0 23.0 29.0 120 or 240 V[...]

V acuum int er r upt er/ operat or When this happens, the latch (25.0) loses its support and releases the striker pin (23.0), that is for ced out by the spring (31.0). On the under voltage r elease 3AX1103, the latch (25.0) is held by the loc king pin (21.0) as long as the armature (9.0) is attracted (energized) (r efer t o Figur e 21: Operator seq[...]

V acuum int er r upt er/ operat or Figure 30: MOC switch operating arm on a circuit break er Figure 31: MOC (bo ttom) and T OC (top) switches and as sociated terminal blocks The auxiliar y switch contains both "b" (normally closed) and "a" (normally open) contacts. When the circuit br eaker is OPEN, the "b" switches ar[...]

Figure 33: Cir cuit-break er compartment (MOC/TOC switch co ver remov ed for pho to) V acuum int er r upt er/ operat or 1. Shutt er-operating link age 2. Shutt ers 3. Racking mec hanism padlock provisions 4. Primar y disconnects (behind shutters) 5. MOC switch (op tional) 6. Curr ent transformers (behind barrier) 12 10 11 2, 4, 6 9 10 2, 4, 6 8 3 9[...]

T rip-free interlock Figure 32: Cir cuit-breaker inter locks and ground disconnect on pag e 33 shows the devices pr oviding the trip-fr ee interlock function. The purpose of the trip-free interlock is t o hold the circuit break er operating-mechanism mechanically and electrically trip-free. The cir cuit break er is held trip-free during racking and[...]

V ehicle function and operational interlocks A type 38-3AH3 vacuum circuit br eaker is comprised mainly of the vacuum interrup ter/operator module fitt ed to a vehicle. This vacuum inter rupter/operat or module is an integral arrangement of operating mechanism, dielectric system, vacuum interrup ters and means of connecting the primary circuit. The[...]

The two plates ar e mounted in alignment and must pass thr ough each other in or der for the cir cuit-breaker vehicle t o enter the draw out compartment. The interlock is coded to test rated v oltage, as well as interrup ting and continuous current ratings. The circuit break er must equal or exceed all of t he cubicle ratings in order t o enter the[...]

V acuum int er r upt er/ operat or Figure 35: CL OSED circuit-breaker int erlock mechanism in stor ed-energy mechanism Close-latch lev er Closing-spring release cam Normal operating position T rip-pushrod cam T rip-latch lever T rip-free pushrod Interlock le vers T rip-pushrod cam Enclosure rear Spring-dump tube Retaining rings The racking-cam prof[...]

V acuum int er r upt er/ operat or The spring-dump cam raises the spring-dump interloc k upon insertion of the circuit break er into the compartment, or upon withdrawal fr om the compar tment. The interlock is raised at about the time the front wheels pas s ov er the cubicle sill. It allows the spring-dum p interlock to be in the r eset (low est) p[...]

Maint enance Hazardous voltage and high-speed moving parts. Will cause death, serious injury and proper ty damage. Do not by-pas s interlocks or otherwise make int erlocks inoperative. Interloc ks must be in operation at all times. Read instruction manuals, obser ve saf ety instructions and use qualified personnel. Introduction and maintenance inte[...]

Maint enance 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 injur y or property damage. Follow all saf ety instructions contained herein. Note: A pr eventiv e maintenance program is not int ended to cov er reconditioning or maj[...]

Maint enance Inspection items and tests Primar y-power path checks Cleanlines s check Inspection of primary disconnects St ored-energy operat or -mechanism checks Maint enance and lubrication F astener check Manual-spring c harging check Contact-er osion check Electrical-control chec ks Wiring and t erminals checks Secondary-disconnect check A utom[...]

Maint enance Removal from switc hgear Prior to performing an y inspection or maintenance chec ks or tests, the circuit break er mus t be remo ved from t he switchgear . The "Installation checks and initial functional tests" section (ref er to page 8) describes the remo val procedur e in detail. The principal steps ar e repeat ed here f or[...]

Inspection of primar y disconnects Figure 38: Primary disconnect in mated position shows the primary-disconnect contact-fingers engaged. When the contacts are mated with t he switchgear primar y-stud assembly , there is f orceful contact distributed ov er a wide area. This maintains low-current flow per individual contact finger . Inspect the conta[...]

Maint enance Figure 39: Operat or mechanism lubrication Klüber L32 or Klüber L32N T ypical for all three-phases 45[...]

Maint enance Primar y-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. Av oid getting contact lubricant on any insulating mat erials. F astener check Inspect all fasteners f or tightness. Bo th locknuts and [...]

Maint enance Electrical-control checks The electrical controls of the type 38-3AH3 vacuum circuit br eaker should be c heck ed during inspection to v erify absence of any mechanical damage, and proper operation of the automatic-spring c harging and close and trip circuits. Unless o therwise noted, all of these t ests are performed without an y cont[...]

Maint enance Figure 41: T ypical vacuum interrup ter 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-cy cles Breaking current symmetrical value Vacuum int errupters, types VS-30030 and VS-30041 21 19 (40 kA) 18 (31.5 kA) 15 (21 kA) Note: Right-hand v ertical segme[...]

Maint enance Electrical close and trip check (control pow er required) A check of the cir cuit-break er control circuits is performed while the unit is still connected t o the switchgear by t he split- plug jumper . This check is made with the circuit br eaker ener gized by contr ol power from the switc hgear . 1. Once the circuit-br eaker spr ings[...]

Maint enance High-potential t ests The next series of tests (vacuum int egrity and insulation) inv olve use of high-voltage test equipment. The cir cuit break er under test should be inside a suitable test barrier equipped with warning lights. Vacuum-int egrity check (using dielectric test) A high-pot ential test is used to v erify the vacuum integ[...]

Maint enance Vacuum-int egrity test procedure 1. Obser ve saf ety pr ecautions listed in the DANGER and W ARNING advisories. Construct the proper barrier and warning light system. 2. Ground the frame of the cir cuit break er , and ground eac h pole not under test. 3. Apply test voltage acr oss each pole for one minute (cir cuit break er OPEN). 4. I[...]

Maint enance 7. Connect all points of the secondar y disconnect with a shorting wire. Connect the shorting wire to the high- pot ential lead of the high-voltage tester and g round the cir cuit-break er housing. Starting with zero v olts, gradually increase the t es t voltage t o 1,500 volts rms, 60 Hz. Maintain test voltage f or one minute. 8. If n[...]

Overhaul Introduction The follo wing procedures along wit h the troubleshoo ting charts at the end of this section, pro vide maintenance personnel with a guide to identifying and corr ecting possible malfunctions of the type 38-3AH3 vacuum circuit br eaker . Circuit-break er ov erhaul T able 5 gives the r ecommended overhaul schedule f or a type 38[...]

Overhaul D. Solenoid mounting scre ws 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 t o coils with new "push on" wire t erminals (Siemens part 15-171-600-002). 3. Lubricate operating mechanism in accordance with ins[...]

Overhaul 1.7 Remove bolt (31.2), loc k washer and large washer at stationary cont act of the vacuum interrup ter (24 mm sock et with ext ension). Carefully note location of the conductive spacer between vacuum int errupter and pole support. This spacer has a concave surface that must be handled with care t o avoid damag e. 1.8 Using a deep 24 mm so[...]

Overhaul Figure 46: V acuum interrupter replacement illustration 20.0 20.0 - Upper pole-support (pole-head) 28.0 - Strut 28.1 - Centering ring 29.1 - Flexible connector 29.2 - T erminal clamp 29.3 - Spacer (or shoulder) 30.0 - Vacuum int errupter 31.2 - Upper terminal-bolt 36.1 - Moving terminal 36.3 - Eye bolt (or adapt er) 40.0 - Lower pole-suppo[...]

Figure 47: Illustration showing r equired t echnique f or fastening terminal-clamp har dware Position of tor que wrench t o avoid undue stressing of mo ving contact (36.1) Holding wrench T erminal clamp (29.2) Vacuum int errupter T orque wrenc h Direction of f orce (P) Spacer (shoulder) (29.3) Moving contact (36.1) Overhaul 57[...]

2.9 Tighten upper fastening bolt (31.2) on the upper pole-support (20.0) holding the vacuum interrup ter firmly by its upper insulator and operat e levers (48.6) b y hand to see whe ther the movable contact mov es freely . If any binding or lack of fr eedom is not ed, loosen bolt (31.2) and adjust the vacuum interrup ter in pole support by turning [...]

Maint enance and troubleshoo ting Sub-assembly Item Inspect for Primar y power path Vacuum int errupter 1. Cleanliness. 2. Cont act erosion. No te: Perform with manual-spring checks. 3. Vacuum integrity . Note: Perform with high-potential t es ts. Primar y disconnects 1. Burnt or damaged f ingers. 2. Lubrication of cont act surfaces. Vacuum int err[...]

Maint enance and troubleshoo ting Problem Symptoms Possible causes and remedies Circuit break er fails to close. Closing spring will not aut omatically charge. 1. Secondar y control circuit is de-energized or control cir cuit fuses are blown. Check and energize or replace if neces sary. 2. Secondar y disconnect cont acts 15 or 16 are not engaging. [...]

Maint enance and troubleshoo ting Problem Symptoms Possible causes and remedies Nuisance or false close Electr ical problem 1. Nuisance or false closing signal to secondar y disconnect 13. Check pro tective r elay logic. Correct as req uired. 2. Closing coil (52SRC) terminal A2 is shor ted- to-gr ound. Check to de termine if pr oblems are in wiring[...]

Control voltages, ANSI/IEEE C37.06 Close coil T rip coil Spring charging mot or Nominal Range Run (Av er age) 1 Inrush (Peak) Charging Close T rip 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 10 10 120 Vac 104 - 127 ---- 4 2.0 ---- 2, 4[...]

Appendix Continuous current Circuit break er 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) T able 10: T ype 38-3AH3 vacuum circuit breaker w eight in lbs (kg) 1, 2, 3 Footnot es: 1. Weight estimat es are f or circuit break er only. Add 125 [...]

Appendix Measured parameter Units Circuit break er type 1 38-3AH3-31 38-3AH3-40 General Nominal voltage class kV 38.0 38.0 Rate d values Rate d volt age Maximum design voltage (V) 2 kV rms 38.0 38.0 V oltage range factor (K) 3 ---- 1.0 1.0 Insulation levels With st and volt age level s Pow er -frequency kV rms 80 80 Lightning-impulse (BIL) kV peak [...]

Appendix T able 13: T ype 38-3AH3 vacuum circuit breaker ratings (hist oric "constant MVA" ratings basis) Measured parameter Units Circuit break er type 1 38-3AH3-1500 General Nominal voltage class kV 38.0 Nominal three-phase MV A class 9 MVA 1500 Rate d values Rate d volt age Maximum design voltage (V) 2 kV rms 38.0 V oltage range factor[...]

Appendix T able 14: Remarks 66[...]

Appendix T able 14: Remarks (continued) 67[...]

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