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Siemens SDV-4A Instruction Manual Download Page 43

Overhaul

Troubleshooting 

(continued)

Possible Causes and Remedies

Problem

Symptoms

1. Nuisance or false closing signal

to TB4.  Check relay logic.
Correct as required.

2. Closing coil (52SRC) terminal

2 is shorted to ground.  Check to
determine if problem is in
wiring or coil.  Correct as
required.

1. Mechanical failure of operating

mechanism.  Check and contact
factory or authorized service
shop.

1. Secondary control power is

de-energized or control power
fuses are blown.  Correct as
indicated.

2. Damage to wiring, terminals or

connectors.  Check and repair as
necessary.

3. No tripping signal to TB7.

Check for continuity and correct
relay logic.

4. Failure of trip coil (52T).

Check and replace if necessary.

5. Auxiliary switch NO contacts

1-2 or 5-6 are open when
breaker is closed.  Check linkage
and switch.  Replace or adjust
as necessary.

1. Failure of tripping spring or

its mechanical linkage.
Check and replace if required.

1. Mechanical failure of operating

mechanism.  Check and contact
factory or authorized service
shop.

2. One or more of the vacuum

interrupters are held closed.
Check and replace as necessary.

1. Tripping signal remains

energized on TB7.  Check for
improper relay logic.

1. Mechanical failure of operating

mechanism.  Check and contact
factory or authorized service
shop.

Electrical problem

Mechanical problem

Tripping coil, or solenoid (52T)
does not energize.  There is no
tripping sound.

Tripping coil (52T) energizes.
No tripping sound is heard, and
breaker contacts do not open
(i.e., they remain closed).

Tripping coil (52T) energizes.
Tripping sound is heard, but
breaker contacts do not open.

Electrical problem

Mechanical problem

Nuisance or false close

Circuit breaker will not trip

Nuisance or false trip

41

Summary of Contents for SDV-4A

Page 1: ...Instructions Installation Operation Maintenance SGIM 3788F 15 5kV 25 8kV and 27 6kV Power Circuit Breaker Type SDV 4A ...

Page 2: ...n purposes It does not relieve the user of responsibility to use sound practices in application installation operation and mainte nance of the equipment purchased Siemens reserves the right to make changes in the specifications shown herein or to make improvements at any time without notice or obligations Should a conflict arise between the general information contained in this publication and the...

Page 3: ...commended Hand Tools 21 Recommended Maintenance and Lubrication 21 De energize the Circuit Breaker 22 Checks Of Primary Power Path 22 Cleanliness Check 22 Checks of the Stored Energy Operator Mechanism 23 Maintenance and Lubrication 23 Fastener Check 23 Manual Spring Charging And Contact Erosion Checks 23 Vacuum Interrupter Stroke Check 24 Damper Assembly Check 25 Electrical Control Checks 25 Chec...

Page 4: ...ous situation which if not avoided could result in death or serious in jury Caution indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury Caution without safety alert symbol indicates a poten tially hazardous situation which if not avoided may re sult in property damage Hazardous Procedures In addition to other procedures described in this manual a...

Page 5: ...nta tive Scope These instructions cover the installation operation and maintenance of Siemens type SDV power circuit breakers using vacuum interrupters The equipment described in this manual consists of free standing outdoor power cir cuit breakers for application up to 27 6kV A typical breaker is shown in Figure 1 All diagrams descriptions and in structions apply to all above types and designs un...

Page 6: ...d not be signed for by the consignee or his agent 4 Notify the Siemens sales office immediately of any damage 5 Arrange for a carrier inspection of damage immediately IMPORTANT Do not move equipment from the place it was set when unloading Equipment must be inspected by carrier prior to handling after receipt This eliminates loss due to claims by carrier that equipment was damaged or further damag...

Page 7: ...e for the weight Lifting Power Circuit Breaker with Crane Recommended lifting of power circuit breakers is by means of cables connected to an overhead crane The cables are connected to the lifting lugs on the top of the breaker as illustrated in Figure 2 A crane with sufficient height should be used so the load angle from horizontal on the lifting cable will be at least 63 degrees when viewed from...

Page 8: ...on and set to the desired height Directions are given in the notice decal X Bracing Installation Instructions for High Seismic Applications Only Once the SDV breaker is set in place at the correct height with the legs correctly installed X bracing must be added to each of the four sides Figure 3 shows appropriate in stallation for the breaker at its highest elevation Other breaker heights will use...

Page 9: ...and careful construction may alleviate many problems at the Figure 4 Anchoring SDV 4A Power Circuit Breaker time of installation and during operation It is important that a relatively level surface be provided capable of sup porting the weight of the breaker and 0 75 inch diameter anchor bolts are recommended Figures 4 illustrates typi cal locations for anchor bolts No special leveling proce dures...

Page 10: ...for connecting to ground pads must be made in such a manner that a reliable ground connection is ob tained Consult latest National Electrical Code or National Electric Safety Code for ground connection standards Secondary Control Wiring All secondary control wiring installed by the factory is neatly routed and secured in place Make all field connections in a similar manner Check that the relay pan...

Page 11: ... two current transformers may be mounted around each roof bushing The bushing current transformer connections are wired to separate terminal blocks located in the control and relay compartment Hazardous voltage Will cause death serious injury and property damage Current Transformers must not be operated with an open circuit and must be either connected to a burden or short circuited and grounded a...

Page 12: ...h fuses Opening the knife switch de energizes control power to the circuit breaker In some breakers pullout type fuse holders or molded case break ers are used in lieu of knife switches Removal of the fuse holder or opening the molded case breaker accomplishes the same result control power is disconnected Figure 6 Control Power Disconnects in Power Circuit Breaker Figure 7 Operator Control Panel o...

Page 13: ... The automatic spring charging features of the circuit breaker must be checked Control power is required for automatic spring charging to take place 1 Use the manual Close and Trip controls Figure 7 to first Close and then Open the circuit breaker contacts Verify contact positions visually by observing the Open Closed indicator on the circuit breaker 2 Open control power circuit by opening knife s...

Page 14: ...stand test on AC equipment or that a DC with stand test represents an acceptable alternative to AC with stand tests When making DC tests the voltage should be raised to the test value in discreet steps and held for a pe riod of one minute Field Dielectric Tests are recommended when new units are installed or after major field modifications The equip ment should be put in good condition prior to th...

Page 15: ... stored in power ful tripping and closing strings These springs are normally charged automatically but there are provisions for manual charging The operating mechanism that controls charg ing closing and tripping functions is fully trip free i e spring charging does not automatically change the posi tion of the primary contacts and the closing function may be overridden by the tripping function at...

Page 16: ...e drive plate 13 As this plate rocks back and forth the upper pawl 24 1 which is connected to the drive plate imparts counterclockwise rotation of the ratchet wheel 15 one tooth at a time The lower pawl 24 2 acts as a holding pawl during electrical charging When the springs are charged manually up and down pumping action of the spring charging handle in the manual charge handle socket 52 causes th...

Page 17: ...k shaft 217 Opening Mode Opening or tripping the vacuum interrupter contacts is accomplished by rotation of the trip shaft 79 Rotation may be produced either electrically by energiz ing the trip solenoid 266 Figure 12 or manually by press ing the trip button Energizing the trip solenoid causes the lower arm of the trip actuator 152 to rotate counterclock wise Pressing the trip button causes the tr...

Page 18: ...gs are attached to a support arm which in turn is bolted to the structure of the circuit breaker operator The opening spring is connected to the jack shaft When the circuit breaker closes rotation of the jack shaft causes the opening spring push rod to compress and charge the opening spring Consequently the opening spring is auto matically charged whenever breaker contacts are closed Trip Free Ope...

Page 19: ... breaker operator housing A mounting bracket holds the motor firmly in place A universal motor is used to permit operation on either AC or DC control power The motor control circuits call for automatic charging of the springs by the motor whenever control power is avail able and the springs are discharged The springs auto matically recharge following a closing operation Electrical connections to t...

Page 20: ...utomatic charging of the closing springs 2 electrical closing of the primary contacts and 3 electri cal tripping of the primary contacts Automatic spring charging by charging motor occurs when secondary control power is available and motor cutoff switch LS1 has not operated The springs are automati cally recharged after each closing operation Electrical closing occurs with closing control power ap...

Page 21: ... TPX 11 a 52 a b Spare Contacts 52 16 TPX 52 15 15 TPX a 16 18 TPX 54 17 17 TPX 52 b 18 51 53 TPX TPX 22 TPX 56 19 21 TPX 52 a 20 24 58 21 22 23 52 b 55 57 27 TPX 28 TPX 26 23 60 52 24 25 a 62 25 52 b 26 59 61 2 08 Motor Power Disconnect 11 1 08 10A 1 2 3 08 10A 4 5 12 6 08T Close Trip Power Disconnect 08T 15A 21 1 2 42 15A 3 08T 4 41 22 5 31 32 01 C Control Switch Close Remote G Green Light Remot...

Page 22: ...7 TPX TPX 23 60 52 a 26 25 28 27 25 62 b 52 59 24 TPX TPX 26 61 52a Aux Switch Open When Bkr Open 52 SRC Closing Spring Release Coil 52b Aux Switch Closed When Bkr Open 52Y Anti Pump Relay 52T Trip Coil LS1 Motor Cutoff Switch LS3 Trip Latch Check Switch LS2 Spring Charged Switch 08T Close Trip Power Disconnect 08 Motor Power Disconnect 69 Closing Cutout Switch 88 Motor TPX Terminal Block R Red Li...

Page 23: ...establish a periodic maintenance program to ensure trouble free and safe operation The frequency of inspection periodic cleaning and preventive mainte nance schedule will depend upon the operation conditions NFPA Publication 70B Electrical Equipment Maintenance may be used as a guide to establish such a program A preventive maintenance program is not intended to cover reconditioning or major repai...

Page 24: ...circuit breaker is OPEN and the closing spring indicator shows DISCHARGED See Figure 21 which shows the breaker condition preced ing the second operation of the Trip pushbutton Figure 21 Manual Tripping of Circuit Breaker Checks Of Primary Power Path The primary power path consists of the three vacuum in terrupters six bus connections to the bushings and the roof mounted bushings These components ...

Page 25: ...es with a light coat of synthetic grease or oil Lubricants composed of diester oils and lithium thickeners will be compatible Shell drawn cup needle bearings Use either Beacon Exxon 325 reference 18 658 676 422 and part number 15 337 131 001 or Supermil Amoco A 72832 reference 18 658 676 423 or Anderol 732 aerosol synthetic fluid grease reference part number 15 172 816 058 Pivots sliding and or ro...

Page 26: ...g Close the breaker and repeat the marking procedure Figure 25b Maintenance 1 Insert the hand charging lever into the manual charge handle socket at the front of the operator control panel Figure 16 shows the lever inserted Up and down mo tion of the lever charges the closing springs Continue cranking until the Charged flag appears in the window of the spring indicator 2 Press the Close pushbutton...

Page 27: ...ol Checks The electrical controls of the type SDV circuit breaker should be checked during inspections to verify absence of any mechanical damage and proper operation of the automatic spring charging and Close and Trip circuits Unless otherwise noted all of these tests are performed without any control power applied to the circuit breaker Check Of The Wiring And Terminals 1 Physically check all of...

Page 28: ...f high voltage test equipment The breaker under test should be inside a suitable test barrier equipped with warning lights Vacuum Integrity Check A high potential test is used to verify the vacuum integrity of the circuit breaker This test is conducted on the circuit breaker with its primary con tacts in the Open position High Potential Test Voltages The voltages for high poten tial tests are show...

Page 29: ...Equipment In ad dition to the High Potential Test Equipment capable of test voltages as listed in Table 4 the following equipment is also required AC High Potential tester with test voltage of 1125 volts 60 Hz Micro Ohmmeter for contact resistance tests Insulation and Contact Resistance Test Procedure 1 Observe safety precautions listed in the danger and cau tion advisories for the Vacuum Integrit...

Page 30: ...e Installation Checks and Initial Functional Tests section of this manual Func tional tests consist of performing at least three 3 Manual Spring Charging Checks and three 3 Automatic Spring Charging Checks After these tests are complete and the springs fully discharged all fasteners and connections are checked again for tightness and condition before placing the breaker back in service Relays and ...

Page 31: ... eccentric drive shaft 3 Rotate the eccentric shaft until the eccentric is at its maxi mum inward position 4 Adjust the hex socket set screw 66 until the driving surface of the upper pawl is approximately 0 031 inch from the face of the ratchet tooth 5 Mount the spring charging motor and operate the charg ing system electrically Adjust the hex socket set screw 66 until the ratchet moves with minim...

Page 32: ...ated in the vertical flange of the operator 10 32 recessed hex socket set screw see Figure 27 3 Nominal latch bite adjustment occurs with the latch ly ing in the horizontal position as shown in accompany ing Figure 28 This position is achieved when the ad justing screw has been turned into the prevailing torque Figure 28 Spring Release Adjustment Screw self clinching nut 14 full turns The set scre...

Page 33: ...enings providing access to the tensioning bolts Turning the left and right hand support bolts counterclock wise relieves spring tension Alternate from the left bolt to the right bolt in small increments This keeps the sliding cross arm relatively level as the tension is removed from the springs Each upper spring hanger is fastened to a crank arm using a hex socket shoulder bolt and nut The nut is ...

Page 34: ...nnecting the switch operating lever to the operating shaft is removed and then the two mounting screws Re assemble in re verse order Replacement Of Opening Spring The opening spring may be removed and replaced without the need to use a spring keeper or compression aid The opening spring assembly consists of the top and bot tom spring caps threaded coupling rod with nuts and a supporting shelf The ...

Page 35: ... LS2 form a common as sembly of two switches on one mounting bracket Should either switch require replacement it is recommended that both be replaced as a single assembly The motor cutoff switch LS1 is the outboard device with respect to the mounting bracket Removal of the two mounting screws shown in Figure 33 allows both switches to be brought out for convenient removal of the interconnecting wi...

Page 36: ...er which is trapped between the shock absorber and the adapter should be kept with the adapter Set the new shock absorber setting to Position 8 tighten the set screw to 6 in lbs Thread the jam nut on to the shock absorber body install star washer and thread the body of the shock absorber into the adapter Continue to thread in until the shock absorber bottoms out on the spacer inside the adapter Pl...

Page 37: ...and pull the coupling rod toward you with one hand while prying the lever off the pin first on one side then on the other side of the pivot block Once both levers are free from the pivot block pins the levers will be pulled down abruptly due to the vacuum pulling the interrupter closed 5 Locate the small pin passing through the levers and the eye of the rod end bearing of the interrupter Remove th...

Page 38: ...d the rod end bearing will be in a vertical position 20 Remove the small pin and reassemble with the spacers and snap rings removed in Step 4 Be sure the snap rings are firmly seated in their grooves Replace the rings if they are bent or feel loose after installation 21 With the 0 250 inch drill rod in place push the coupling rod assembly into firm contact with the operating levers While maintaini...

Page 39: ...terrupter Family Stationary Contact Movable Contact Torque Size Torque Size Torque Size VS17006 VS25008 M12 M16 45 50 ft lbs 61 68 N m 60 65 ft lbs 81 88 N m M10 M12 15 20 ft lbs 20 27 N m 15 20 ft lbs 20 27 N m M10 M10 26 35 ft lbs 35 47 N m 26 35 ft lbs 35 47 N m Overhaul Figure 37 VS17006 15 5kV 1200 Amp 37 ...

Page 40: ...Overhaul Figure 38 VS25008 15 5kV 2000 Amp 25 8 27 6 kV 2000Amp Figure 39 VS25008 25 8 27 6kV 1200 Amp Figure 40 Tube Clamp Fastening Procedure Stroke Adjustment 38 ...

Page 41: ...z 53 or 63 6kV DC depending upon voltage rating of breaker refer to Table 4 1 60 second withstand 1125V 60 Hz 1 Record contact resistance with contacts closed and recheck each maintenance interval to monitor condition 1 Cleanliness 2 Cracking Overhaul Primary Power Path Interrupter Operator Mechanism Electrical Controls High Potential Test Insulation Vacuum Interrupter Cleanliness Fasteners Manual...

Page 42: ...ontacts 21 22 or 31 32 or 13 14 Check and replace as required 4 Failure of close coil solenoid 52SRC Check and replace as required 5 Auxiliary switch NC contacts 3 4 are open when breaker contacts are open Check linkage and switch Replace or adjust as necessary 6 Spring charged switch LS2 NO contact remains open after springs are charged Check and replace as required 1 Check close latch position R...

Page 43: ...reaker is closed Check linkage and switch Replace or adjust as necessary 1 Failure of tripping spring or its mechanical linkage Check and replace if required 1 Mechanical failure of operating mechanism Check and contact factory or authorized service shop 2 One or more of the vacuum interrupters are held closed Check and replace as necessary 1 Tripping signal remains energized on TB7 Check for impr...

Page 44: ... the serial number alone all additional information that is given will serve as a check to be certain that the part or parts furnished are correct for the breaker in question Without this serial num ber Siemens cannot be sure of the correct identity of the desired parts If any doubt exists as to the instruction book reference num ber or the description a dimensional sketch of the desired part will...

Page 45: ... 5 83 5 83 5 83 5 83 5 83 5 36 36 52 52 56 56 29 29 48 5 48 5 52 52 20 25 20 25 20 25 1200 2000 1200 2000 1200 2000 1200 2000 1200 2000 1200 2000 1 0 1 0 1 0 1 0 1 0 1 0 15 5 15 5 25 8 25 8 27 6 27 6 48 VDC 125 VDC 250 VDC 120 VAC 240 VAC 1 Current at nominal voltage 2 10A for coils mid 1993 and later For coils supplied up to mid 1993 current is 23A Table A 2 15 5kV and 25 8kV Type SDV Circuit Bre...

Page 46: ... Close Coil Rating VDC 48 125 250 48 125 250 VAC 115 230 115 230 Operating Mechanism type GMI Stored Energy Stored Energy Interrupting Medium Vacuum Vacuum Emergency Trip Standard Standard Minimum Reclosing Time3 sec 0 3 0 3 RIV 1000kHz µv less than 500 less than 650 Rated Duty Cycle CO 15 sec CO CO 15 sec CO O 0 35 CO 15 sec CO O 0 3sec 15sec CO Seismic Withstand Standard SDV 4A IEEE STD 693 1997...

Page 47: ...laces SGIM 3788D 2 03 Printed in U S A 2002 Siemens Power Transmission Distribution Inc SIEMENS is a registered trademark of Siemens AG Siemens Power Transmission Distribution Inc P O Box 29503 Raleigh NC 27626 0503 ...

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