Siemens 38-3AH3 38 kV User Manual Download

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Answers for energy.

Type 38-3AH3 38 kV

vacuum circuit breaker

instruction manual

Installation operation maintenance E50001-F710-A238-V1-4A00

Summary of Contents for 38-3AH3 38 kV

Page 1: ...Answers for energy Type 38 3AH3 38 kV vacuum circuit breaker instruction manual Installation operation maintenance E50001 F710 A238 V1 4A00 ...

Page 2: ...lified person shall also be familiar with the proper use of special precautionary techniques personal protective equipment insulating and shielding materials and insulated tools and test equipment Such persons are permitted to work within limited approach of exposed live parts operating at 50 volts or more and shall at a minimum be additionally trained in all of the following The skills and techni...

Page 3: ...ation or maintenance Should further information be desired or should particular problems arise that are not covered sufficiently for the purchaser s purposes the matter should be referred to the local sales office The contents of this instruction manual shall not become part of or modify any prior or existing agreement commitment or relationship The sales contract contains the entire obligation of...

Page 4: ...he proper design and fabrication by Siemens The purpose of this instruction manual is to assist the user in developing safe and efficient procedures for the installation maintenance and use of the equipment Contact the nearest Siemens representative if any additional information is desired Signal words The signal words danger warning and caution used in this instruction manual indicate the degree ...

Page 5: ...istance 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 For medium voltage customer service issues contact Siemens at 1 800 347 6659 or 1 919 365 2200 outside the U S 5 ...

Page 6: ...es note whether the equipment is properly protected from the elements Note the trailer number the equipment arrived on Note also any blocking of equipment During unloading check the actual equipment delivered to verify it agrees with the delivery receipt 2 Make immediate inspection for visible damage upon arrival and prior to disturbing or removing packaging or wrapping material This should be don...

Page 7: ...on report and or driver s signature on the delivery receipt does not constitute approval to repair Receiving handling and storage Note Any determination as to whether the equipment was properly loaded or properly prepared by shipper for over the road travel cannot be made at the destination Shipments are not released from the factory without a clear bill of lading Approved methods are employed for...

Page 8: ...echanical abuse and rapid temperature variations Outdoor storage Outdoor storage is not recommended When no other option is available the circuit breaker must be completely covered and protected from rain snow dirt and all other contaminants Space heating Space heating must be used for both indoor and outdoor storage to prevent condensation and corrosion When the circuit breaker is stored outdoors...

Page 9: ... some switchgear assemblies a molded case circuit breaker or knife switch is used in lieu of the pullout type fuse holder Opening this circuit breaker or switch accomplishes the same result control power is disconnected Spring discharge check refer to Figure 1 Type 38 3AH3 vacuum circuit breaker front panel controls on page 8 Perform the spring discharge check before removing the circuit breaker f...

Page 10: ...n place 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 if not on raised pad and Shelter Clad outdoor switchgear After performing the spring discharge check with control power de energized remove the circuit breaker from its switchgear c...

Page 11: ...fuse rollout truck or circuit breaker not at floor level VT fuse rollout truck in upper cell shown Procedure for circuit breaker in lower cell but not at floor level is similar Racking crank engagement procedure A crank for racking the circuit breaker is provided as a standard accessory Racking a circuit breaker can be accomplished with the drawout compartment front door open or through a small op...

Page 12: ...orrect it before continuing with racking Physical inspections 1 Verify the rating of the circuit breaker is compatible with both the system and the switchgear 2 Perform a visual damage check Clean the circuit breaker of all dust dirt and foreign material Manual spring charging check 1 Insert the manual spring charging crank into the manual charge handle socket as shown in Figure 4 Turn the crank c...

Page 13: ...er by repeating Step 1 Disconnect the split plug jumper from the switchgear before disconnecting the circuit breaker end 7 Perform the spring discharge check again Verify the closing springs are DISCHARGED and the primary contacts of the type 38 3AH3 vacuum circuit breaker are OPEN Figure 5 Split plug jumper connected to circuit breaker Figure 6 Split plug jumper connected to switchgear Final mech...

Page 14: ...ED indicator Operations counter Capacitor trip optional Jack shaft Closed circuit breaker interlock Spring charging motor behind limit switches Trip free interlock Ground disconnect Auxiliary switch Close coil Trip coil Push to trip Mechanism operated cell MOC switch operator Secondary disconnect Push to close Closing spring Opening spring Gearbox 14 ...

Page 15: ...he vacuum interrupter is simple Figure 9 Vacuum interrupter cutaway view is a cutaway view of a typical vacuum interrupter The entire assembly is sealed after a vacuum is established The vacuum interrupter stationary contact is connected to the upper disconnect stud of the circuit breaker The vacuum interrupter movable contact is connected to the lower disconnect stud and driving mechanism of the ...

Page 16: ...11 Type 38 3AH3 vacuum circuit breaker with inter phase and outer phase barriers installed on page 17 is a rear view of a type 38 3AH3 vacuum circuit breaker that shows the outer phase to ground and interphase insulating barriers These glass polyester insulating barriers are attached to the circuit breaker frame and provide suitable electrical insulation between the vacuum interrupter primary circ...

Page 17: ...le consists of the three poles each with its vacuum interrupter and primary insulators mounted on the common motor or hand charged spring stored energy operating mechanism housing This module is shown in Figure 12 Interrupting operating mechanism module shown with outer phase barrier removed Construction Refer to Figure 12 Interrupting operating mechanism module shown with outer phase barrier remo...

Page 18: ...is connected with the lower terminal 29 0 by terminal clamp 29 2 and a flexible shunt 29 1 Vacuum interrupter Refer to Figure 9 Vacuum interrupter cutaway view on page 15 The moving contact 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 Switching operation Refe...

Page 19: ...mp 30 0 Vacuum interrupter 31 0 Stationary contact 31 2 Upper terminal bolt 34 0 Bellows not shown 35 0 Guide bushing not shown 36 0 Moving contact 36 3 Eye bolt 40 0 Pole bottom 48 0 Insulating coupler 48 6 Angled lever 48 9 Guide link 49 0 Contact pressure spring 60 0 Operator housing 63 0 Jack shaft 63 7 Lever 64 1 Pawl not shown 64 2 Pawl 31 2 30 0 31 0 36 0 28 0 28 1 29 2 29 1 36 3 29 0 40 0 ...

Page 20: ...e 55 2 Control lever 58 0 CLOSED OPEN indicator 59 0 Operation counter 60 0 Operator housing 61 8 Shock absorber 62 0 Closing spring 62 2 Crank 62 3 Cam disc 62 5 Lever 62 5 2 Close latch pawl 62 6 Driver lever 62 8 Trip free coupling rod 63 0 Jack shaft 63 1 Phase C lever 63 5 Phase B lever 63 7 Phase A lever 64 0 Opening spring 64 2 Pawl 64 3 Lever 64 3 1 Pawl roller 68 0 Auxiliary switch 68 1 L...

Page 21: ...a make or a break contact If a make contact is used the coil is shorted out and a resistor must be used to limit the current The undervoltage release option mounts to the immediate right of the trip coil 54 1 Motor operating mechanism The spring charging motor 50 4 is bolted to the charging mechanism 50 2 gear box installed in the mechanism housing Neither the gear box mechanism nor the motor requ...

Page 22: ...27 If the circuit breaker is to be closed locally the closing spring is released by pressing the close button 53 0 In the case of electrical control the spring release coil 52SRC 53 1 unlatches the closing spring As the closing spring discharges the charging shaft is turned by crank 62 2 The cam disc 62 3 at the other end of the charging shaft actuates the drive lever 62 6 with the result that the...

Page 23: ...ver and jack shaft Under these conditions the vacuum interrupter contacts cannot be closed Opening If the circuit breaker is to be tripped locally the tripping spring 64 0 is released by pressing the trip button 54 0 In the case of an electrical command being given the shunt trip coil 52T 54 1 unlatches the tripping opening spring 64 0 The tripping spring turns the jack shaft 63 0 via lever 63 5 t...

Page 24: ... 62 8 8 Trip free actuator 63 0 Jack shaft 63 1 Lever phase C 63 5 Lever phase B 63 7 Lever phase A 64 0 Opening spring 64 2 Trip latch pawl 64 2 1 Trip latch pin 64 2 2 Latching pawl release lever 64 3 Lever 64 3 1 Jack shaft pawl 64 5 Opening spring shaft Items moved from position shown in Figure 19 Operating mechanism section diagram drawout trip free linkage shown mechanism CLOSED closing spri...

Page 25: ...ip 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 0 Jack shaft 63 1 Lever phase C 63 5 Lever phase B 63 7 Lever phase A 64 0 Opening spring 64 2 Trip latch pawl 64 2 1 Trip latch pin 64 2 2 Latching pawl release lever 64 3 Lever 64 3 1 Jack shaft pawl 64 5 Open...

Page 26: ...d 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 1 Trip latch pin 64 2 2 Latching pawl release lever 64 3 Lever 64 3 1 Jack shaft pawl 64 5 Opening spring shaft Numbered items moved from position shown in Figure 18 Operating mechanism section diagram drawout trip free linkage shown mechanism OPEN closing s...

Page 27: ...ly 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 1 Trip latch pin 64 2 2 Latching pawl release lever 64 3 Lever 64 3 1 Jack shaft pawl 64 5 Opening spring shaft Numbered items moved from position shown in Figure 19 Operating mechanism section diagram drawout trip free linka...

Page 28: ...rge motor has recharged the closing spring and opened LS3 anti pump relay 52Y picks up and seals in The anti pump relay 52Y opens two contacts in series with the close coil 52SRC The close coil 52SRC is now blocked and cannot be activated until springs are fully charged and close command is removed Rapid auto reclosing The closing spring is automatically recharged as described above Therefore when...

Page 29: ...rip R Red indicating light closed W White indicating light spring charged Standard Fuses in close circuit Slugs in trip circuit fuses optional Shown with springs DISCHARGED trip latch reset circuit breaker OPEN CONNECT or WITHDRAWN position DC supply SD3 W SD16 SD13 01 C 01 T LS41 LS21 LS22 Motor 88 MI1 MI2 52b SD15 TB 1 2 3 4 5 6 52Y 52Y A1 52SRC A2 LS9 13 14 21 22 21 22 22 21 41 42 22 21 31 32 1...

Page 30: ...te selection on page 31 Secondary shunt release optional 54 2 A secondary shunt release second trip coil is used for electrical tripping of the circuit breaker by protective relays or manual control devices when more than one trip coil is required The second trip coil is generally connected to a separate auxiliary supply dc or ac from the control supply used for the normal trip coil Undervoltage r...

Page 31: ...ock operate selection on page 31 The release consists of a spring power storing mechanism a latching device and an electromagnet These elements are accommodated side by side in a housing 3 0 with a detachable cover and three through holes 5 0 for fastening screws The supply leads for the trip coil are connected to a terminal block 33 0 The energy storing mechanism consists of the striker pin 23 0 ...

Page 32: ... operation Figure 27 Secondary disconnect on the circuit breaker Figure 28 Secondary disconnect inside the switchgear Figure 29 Auxiliary switch The capacitor trip includes a rectifier to convert the 120 or 240 Vac control voltage to a dc voltage that is used to charge a large capacitor to the peak of the converted voltage wave refer to Figure 26 Capacitor trip device on page 31 Shock absorber A t...

Page 33: ...3 Circuit breaker compartment MOC TOC switch cover removed for photo on page 34 Operation of the circuit breaker causes the pantograph linkage to transfer motion to the MOC switches located above the pantograph Figure 32 Circuit breaker interlocks and ground disconnect 1 Ground disconnect 2 Spring dump interlock 3 Trip free interlock 6 4 CLOSED circuit breaker racking interlock 5 Circuit breaker f...

Page 34: ... Racking mechanism padlock provisions 4 Primary disconnects behind shutters 5 MOC switch optional 6 Current transformers behind barrier 12 10 11 2 4 6 9 10 2 4 6 8 3 9 7 Secondary disconnect 8 Trip free padlock provisions 9 Current transformer barrier 10 Racking mechanism 11 Ground bar 12 Rating interlocks 13 MOC operating pantograph 13 7 5 1 34 ...

Page 35: ... make interlocks inoperative Interlocks must be in operation at all times Read this instruction manual Know and understand correct interlock function Check interlock function prior to inserting a circuit breaker into a switchgear cubicle Circuit breaker frame The frame of the type 38 3AH3 vacuum circuit breaker contains several important devices and features deserving of special attention These ar...

Page 36: ... in the drawout compartment refer to Figure 33 Circuit breaker compartment MOC TOC switch cover removed for photo on page 34 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 ...

Page 37: ... plate removed for photo on page 34 shows the racking mechanism located on the floor in the center of the circuit breaker compartment Note the two wing like elements that project from the left side of the racking mechanism The CLOSED circuit breaker interlock plunger when down circuit breaker CLOSED falls behind the front wing in the TEST position and behind the rear wing in the CONNECT position V...

Page 38: ...erating mechanism detail components that establish a trip free condition as the tube 4 0 rises The rising tube raises a lever attached to the base of the operating mechanism enclosure This lever raises the trip free pushrod The rising trip free pushrod elevates the trip free pushrod cam that pushes the trip free coupling lever 62 8 3 refer to Figure 15 Stored energy operating mechanism on page 20 ...

Page 39: ...ring release cam moves the closing spring latch that causes the closing springs to discharge However the trip free interlock is raised so that the operating mechanism is held trip free refer to Trip free interlock on page 33 Thus the energy in the closing springs is released spring dump without movement of the jack shaft or the vacuum interrupter contacts D Trip free interlock position mechanical ...

Page 40: ...peratures The definition of usual service conditions is subject to a variety of interpretations Because of this you are best served by adjusting maintenance and lubrication intervals based on your experience with the equipment in the actual service environment Regardless of the length of the maintenance and lubrication interval Siemens recommends the circuit breaker should be inspected and exercis...

Page 41: ...nd metric fasteners Metric fasteners are used for the vacuum interrupters and in the vacuum interrupter operator module SAE U S customary fasteners are used in most other locations This list of hand tools describes those normally used in disassembly and re assembly procedures Metric Sockets and open end wrenches 7 8 10 13 16 17 18 19 and 24 mm Hex keys 2 5 6 8 and 10 mm Deep sockets 19 and 24 mm T...

Page 42: ...ct 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 Recommended maintenance and lubrication Periodic maintenance and lubrication should include all the tasks shown in Table 1 Recommended procedures for each of the listed tasks are ...

Page 43: ...person to maneuver the unit on a level surface without assistance Checks of the primary power path The primary power path consists of three vacuum interrupters and three upper and three lower primary disconnects These components are checked for cleanliness and condition The vacuum interrupters are also checked for vacuum integrity Some test engineers prefer to perform the contact erosion check dur...

Page 44: ...ntervals assume the circuit breaker is operated under usual service conditions as discussed in ANSI IEEE C37 20 2 section 8 1 and C37 04 section 4 together with C37 010 section 4 The maintenance and lubrication interval is the lesser of the number of closing operations or the time interval since last maintenance The vacuum interrupter operator mechanism is shown in Figure 39 Operator mechanism lub...

Page 45: ...Maintenance Figure 39 Operator mechanism lubrication Klüber L32 or Klüber L32N Typical for all three phases 45 ...

Page 46: ...currents are interrupted or when the vacuum interrupter is nearing the limit of its contact life Determination of acceptable contact condition is checked by the visibility of the white erosion mark refer to Figure 40 Contact erosion check mark dot circled in orange shown with circuit breaker OPEN The white erosion mark is located in the keyway or slot on the movable stem of the vacuum interrupter ...

Page 47: ... 13 Primary tasks of this check are 1 The circuit breaker is energized with control power for this check 2 De energize the source of control power 3 Install the circuit breaker end of the split plug jumper over the secondary disconnect of the circuit breaker The split plug jumper has one male and one female connector and cannot be installed incorrectly refer to Figure 5 Split plug jumper connected...

Page 48: ...ymmetrical value Vacuum interrupters types VS 30030 and VS 30041 21 19 40 kA 18 31 5 kA 15 21 kA 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 49: ...uide to life expectancy Vacuum interrupter mechanical check Refer to Figure 42 Lower pole support with insulated coupler Figure 43 Primary contact CLOSED and insulated coupler DISCONNECTED and Figure 44 CLOSED primary contact forced OPEN by manual pressure on page 49 Figure 45 Contact resistance test of the primary contacts on page 52 and Figure 46 Vacuum interrupter replacement illustration on pa...

Page 50: ...g half wave rectification These devices produce high peak voltages High peak voltages will produce X ray radiation DC testers producing excessive peak voltages also show erroneous readings of leakage current when testing vacuum circuit breakers High potential tests employ hazardous voltages Will cause death and serious injury Follow safe procedures exclude unnecessary personnel and use safety barr...

Page 51: ...rd of periodic as found tests enables the maintenance organization to determine when corrective actions are required by watching for significant deterioration in insulation resistance or increases in contact resistance Rated maximum voltage Rated power frequency withstand Field test voltage kV rms kV rms kV rms kV dc 38 0 80 60 85 Table 3 High potential test voltages Insulation and contact resista...

Page 52: ...he circuit breaker front panel Visually verify the DISCHARGE condition of the springs 2 Remove phase barriers as shown in Figure 7 Circuit breaker primary disconnects on page 13 3 Clean barriers and post insulators using a clean cloth dipped in isopropyl alcohol 4 Replace all barriers Check all visible fasteners again for condition and tightness Note Do not use any cleaning compounds containing ch...

Page 53: ...aul of the circuit breaker when required Vacuum interrupters as determined by vacuum integrity test contact erosion or after 10 000 operations Spring release coil 52SRC Shunt trip coil 52T Auxiliary switch Trip free drive bar mechanism When these parts are changed locking devices must also be removed and replaced These include lock washers retaining rings retaining clips spring pins cotter pins et...

Page 54: ...und the bottom or movable contact end of the vacuum interrupter The movable contact uses a metal bellows to maintain the vacuum seal while still permitting up and down motion of the contact This metal bellows is rugged and reliable and is designed to withstand years of vertical movement However care should be exercised to avoid subjecting the metal bellows to excessive torque during removal and re...

Page 55: ...n on the movable stem 2 3 Install the conductive spacer between the fixed upper terminal of the vacuum interrupter 30 0 and the upper pole support 20 0 with the concave side of the spacer facing the vacuum interrupter Align vacuum interrupter and fasten finger tight using heavy flat washer lock washer and nut 31 2 2 4 Fasten the upper pole support to the post insulator using finger pressure only u...

Page 56: ... 1 Flexible connector 29 2 Terminal clamp 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 48 6 Angled lever 48 9 Drive link 31 2 28 0 30 0 28 1 29 3 29 1 29 2 36 3 40 0 48 6 48 5 36 1 48 0 48 9 56 ...

Page 57: ...or fastening terminal clamp hardware Position of torque wrench to avoid undue stressing of moving contact 36 1 Holding wrench Terminal clamp 29 2 Vacuum interrupter Torque wrench Direction of force P Spacer shoulder 29 3 Moving contact 36 1 Overhaul 57 ...

Page 58: ...m surface of the terminal clamp to the bottom edge of the cutout opening Measure carefully and record your result 3 4 Connect the insulating coupler 48 0 using pin 48 5 and the retaining clips provided 3 5 Repeat the measurement described in step 3 3 again with care to maximize accuracy Record your result 3 6 Determine difference between the measurements made under steps 3 3 and 3 5 Your result sh...

Page 59: ... Manual spring check 1 Smooth operation of manual charging manual closing and manual tripping Lubrication 1 Evidence of excessive wear 2 Lubricaion of wear points Electrical controls Wiring 1 Mechanical damage or abrasion Terminals and connectors 1 Tightness and absence of mechanical damage Close and trip solenoids anti pump relay auxiliary switches and secondary disconnect 1 Automatic charging 2 ...

Page 60: ...ound of circuit breaker closing 1 Secondary control circuit de energized or control circuit fuses blown Correct as indicated 2 No closing signal to secondary disconnect pin 13 Check for continuity and correct protective relay logic 3 Secondary disconnect contacts 13 or 15 are not engaging Check and correct as required 4 Failure of anti pump relay 52Y contacts 21 to 22 31 to 32 or 13 to 14 Check an...

Page 61: ...ck and replace if required 5 Failure of trip coil 52T Check and replace if necessary 6 Auxiliary switch NO contacts 23 to 24 or 33 to 34 are OPEN when circuit breaker is CLOSED Check linkage and switch Replace or adjust as necessary Tripping coil 52T energizes No tripping sound is heard and circuit breaker contacts do not open In other words they remain CLOSED 1 Failure of tripping spring or its m...

Page 62: ...rip 3 Value preceding slash is the current for the standard trip coil with standard rating interrupting time Value following is current for optional trip coil with three cycle interrupting time 4 means this selection is not available Footnotes 1 Two contacts in series 2 All switch contacts are non convertible Type switch Continuous current Control circuit voltage Non inductive A 120 Vac 240 Vac 48...

Page 63: ...er dimensions in inches mm W x D x H Net 44 1 117 mm x 46 1 168 mm x 51 1 294 mm Packed for shipment separate from switchgear 48 1 218 mm x 48 1 218 mm x 60 1 522 mm Spring charging time 10 s Close time from energizing close coil at rated control voltage to contact touch last pole 38 kV 70 ms Opening time from energization trip coil at rated control voltage to contact part last pole not including ...

Page 64: ...priate The 3 000 A fan cooled rating is achieved using fan cooling as indicated in Footnote 4 2 Maximum design voltage the circuit breaker is designed for and the upper limit for operation 3 K is listed for informational purposes only For circuit breakers rated on a constant kA basis the voltage range factor is 1 0 4 3000FC indicates fan cooling is included in the switchgear structure for this rat...

Page 65: ...etrical interrupting capability of a circuit breaker at an operating voltage between 1 K times rated maximum design voltage and rated maximum design voltage the following formula shall be used Required Symmetrical Interrupting Capability Rated Short Circuit Current I x Rated Maximum Design Voltage Operating voltage These ratings are in accordance with ANSI IEEE C37 04 1979 Standard Rating Structur...

Page 66: ...Appendix Table 14 Remarks 66 ...

Page 67: ...Appendix Table 14 Remarks continued 67 ...

Page 68: ...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 The information in this document contains general descriptions of the technical options available which may not apply in all cases The required technical ...

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