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Summary of Contents for Powell PowlVac IB-77120
- Page 1 IB-77120 PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker Replacement for Allis Chalmers (Siemens) Type MA Air Circuit Breaker Powered by Safety ®...
- Page 2 PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 This page is intentionally left blank. Powered by Safety ®...
- Page 3 IB-77120 Contact Information Powell Electrical Group www.powellind.com info@powellind.com Service Division PO Box 12818, Houston, Texas 77217-2818 Tel: 713.944.6900 Fax: 713.948.4569 Powered by Safety ®...
- Page 4 “IMPORTANT”. This is defined as: IMPORTANT IMPORTANT IMPORTANT indicates a section of the manual covering a non hazardous situation, but one where Powell feels proper attention is warranted. Powered by Safety ®...
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Page 5: Table Of Contents
IB-77120 Contents INTRODUCTION ..........................2 A. SCOPE ....................................2 B. PuRPOSE ..................................2 C. INSTRuCTION BuLLETINS AVAILABLE ELECTRONICALLY ................2 SAFETY .............................2 A. SAFE WORk CONdITION ............................2 B. SAFETY GuIdELINES ..............................3 C. GENERAL ..................................3 d. SPECIFIC ..................................4 E. - Page 6 PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Contents INSTALLATION ..........................17 A. RECEIVING ..................................17 B. HANdLING ...................................18 C. STORAGE ..................................18 d. PLACING THE CIRCuIT BREAkER INTO SERVICE ...................19 1) High-Voltage Insulation Integrity ...............................19 2) Vacuum Integrity ......................................20 3) Control Voltage Insulation Integrity ..............................21 4) Mechanical Operation Check ................................21 5) Electrical Operation Check ..................................22 E.
- Page 7 IB-77120 Contents VI. RECOMMENDED RENEWAL PARTS AND REPAIR PROCEDURES ..........41 A. ORdERING INSTRuCTIONS ............................41 B. RECOMMENdEd RENEWAL PARTS ........................42 C. REPLACEMENT PROCEduRES ..........................42 1) Vacuum Interrupter Assembly ................................42 2) Closing Coil Assembly.....................................44 3) Primary Shunt Trip Coil Assembly ..............................45 4) Secondary Shunt Trip Coil Assembly ..............................45 5) undervoltage device Assembly ................................46 6) Charging Motor Assembly ..................................46 7) Anti-Pump Relay Assembly ...................................46...
- Page 8 PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Figures Figure 1 - Side View of PowlVac-Nd MA Replacement Circuit Breaker ..............6 Figure 2 - Front View of PowlVac-Nd MA Replacement Circuit Breaker with Cover..........8 Figure 3 - Close up Front View of PowlVac-Nd MA Replacement Circuit Breaker ..........9 Figure 4 - Cam and Fundamental Linkage Positions .....................10 Figure 5 - Mechanical and Trip Linkages ..........................11 Figure 6 - Lubrication ................................27...
- Page 9 IB-77120 Tables Table A - Field dielectric Test Values ..........................20 Table B - Lubrication ................................29 Table C - Primary Current Path .............................37 Table d - Control devices ...............................38 Table E - Miscellaneous Parts ...............................39 Table F - Timing ..................................41 Table G - Primary Resistance ..............................41 Powered by Safety ®...
- Page 10 PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 This space is intentionally left blank. Powered by Safety ®...
- Page 11 This document and all other documentation shall be fully read, understood, and all warnings and cautions shall be abided by. If there are any discrepancies or questions, the user shall contact Powell immediately at 1.800.480.7273. WARNING WARNING...
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Page 12: Introduction
For additional information and instructions for particular problems which are not presented sufficiently for the user’s purposes contact Powell at 1.800.480.7273. INTRODUCTION The illustrations contained in this document may not represent the exact construction details of A. -
Page 13: Safety Guidelines
IB-77120 2) After properly interrupting the load current, mandatory that the following rules be observed OPEN the disconnecting device(s) for each to ensure the safety of personnel associated with source. usage, installation, operation, and maintenance of 3) Wherever possible, visually verify that all these circuit breakers. -
Page 14: Specific
If for any reason an interlock does not function as described, do not make any adjustments, modification, or deform the parts. DO NOT FORCE THE PARTS INTO POSITION. CONTACT POWELL FOR INSTRUCTIONS. Powered by Safety ®... -
Page 15: Description
IB-77120 III. DESCRIPTION the front cover. The front cover is held in place by ten (10) cover bolts. The bolts may be removed to allow access to the A. GENERAL stored energy mechanism and its interlocks, auxiliary switches, and other control The PowlVac-Nd®... -
Page 16: Figure 1 - Side View Of Powlvac-Nd Ma Replacement Circuit Breaker
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Figure 1 - Side View of PowlVac-ND MA 5kV Replacement Circuit Breaker Mechanism Housing Primary Disconnect Contacts MOC Switch Actuator Vacuum Interrupter Rail Latch Levering in Nut Housing Lift Point Guide Rail Main Insulating Operating Arm (Push Rod) Ground Connection Support Insulator (Wishbone) - Page 17 IB-77120 When the charging motor is energized, the and start to rotate the camshaft. At the eccentric drive shaft rotates and causes same time, the pawls are uncoupled from the pawl support arms to pivot about the the ratchet wheel by the pawl lift plate camshaft (Figure 3, j).
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Page 18: Figure 2 - Front View Of Powlvac-Nd Ma Replacement Circuit Breaker With Cover
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Figure 2 - Front View PowlVac-ND MA Replacement Circuit Breaker with Cover Spring Charge Indicator Front Cover Attachment Bolts Operation Counter Manual Charging Crank Manual Close Paddle Nameplate Circuit Breaker Open/Close Indicator Handle Manual Trip Paddle Shutter Ramp Location... -
Page 19: Figure 3 - Close Up Front View Of Powlvac-Nd Ma Replacement Circuit Breaker
IB-77120 Figure 3 - Close Up Front View PowlVac-ND® MA Replacement Circuit Breaker Charging Motor Close Bar Adjusting Screw Reset Spring Connecting Rod Closing Coil Secondary Trip Prop Main Closing Spring m. Drive Pawl Levering Shaft Auxiliary Switch Pawl Lift Plate w. -
Page 20: Figure 4 - Cam And Fundamental Linkage Positions
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Figure 4 - Cam and Fundamental Linkage Positions b) Breaker Closed - Spring discharged a) Breaker Open - Spring Charged - Links Reset c) Breaker Open - Spring discharged d) Breaker Closed - Spring Charged Powered by Safety ®... -
Page 21: Figure 5 - Mechanical And Trip Linkages
IB-77120 Figure 5 - Mechanical and Trip Linkages Secondary Trip Prop Adjusting Screw Secondary Trip Prop Shaft Secondary Trip Prop Secondary Linkage Roller Main Cam Roller Reset Spring Camshaft Main Closing Cam Center Phase Operating Lever Jackshaft Primary Trip Prop Roller Primary Trip Prop Adjusting Screw m. - Page 22 PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Each operating pushrod assembly has frame side sheets and by the mechanism. a recess at each end which encloses a The outer operating levers on the jackshaft contact loading spring. At the end of this have connections to the circuit breaker spring is a spring yoke, which connects auxiliary switch and MOC operating linkage.
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Page 23: Electrical Description
IB-77120 2) Electrical Description d) Operating Solenoids a) Charging Motor Electrical operation of the circuit breaker is accomplished using The function of charging motor (Figure operating solenoids. 3, a) is to compress the main closing spring of the stored energy mechanism, The closing coil (Figure 3, l) is an thus providing the necessary energy to operating solenoid located at the... -
Page 24: Racking Mechanism
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 C. RACKING MECHANISM cubicles of like continuous rating are applied, and that circuit breakers 1) General Description with dissimilar continuous current ratings are excluded from cubicles The levering in device is the mechanical of unlike current ratings. -
Page 25: A) Disconnected Position
IB-77120 When the breaker is inserted, it is rolled into a) Disconnected Position the cubicle and pushed until it stops and automatically locks in the disconnected A metallic shutter covers the openings position. The breaker release foot pedal of the stationary primary disconnect must be depressed to move it to the test devices which prevents contact. -
Page 26: Primary Disconnecting Contacts
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 D. CIRCUIT BREAKER COMPARTMENT disconnect interlocking lever INTERFACES (Figure 2, g) until it locks in place. Then push the secondary disconnect plug into 1) Primary Disconnecting Contacts the secondary disonnect receptacle. Secure the latch (Figure 2, o) on the lower side of There are six primary disconnecting the secondary disconnect receptacle to lock... -
Page 27: Ground Connection
IB-77120 5) Ground Connection contact block makes contact with this block and the moving stem of the vacuum interrupter. The The ground connection is an assembly multiple parallel paths of the sliding contact of spring loaded fingers that ground the assembly keep the current density low. -
Page 28: Vacuum Interrupters
Powell representative. 2. The breaker should be stored in a clean location, free from corrosive gases or B. HANDLING fumes. -
Page 29: Placing The Circuit Breaker Into Service
Before shipment from our factory, all circuit required, the DC high potential test machine breaker functions are thoroughly checked. The must not produce instantaneous peak user must verify functions after receipt. Powell voltages exceeding 20kV. recommends that the tests be performed in the sequence listed below: WARNING 1. -
Page 30: Vacuum Integrity
Integrity. spacing. The x-radiation, produced during this test with Powell offers a compact and lightweight the voltage specified in Table A and normal PowlVac Vacuum Integrity Tester contact spacing, is extremely low and well designed specifically for PowlVac circuit below the maximum permitted by standards. -
Page 31: Control Voltage Insulation Integrity
IB-77120 dC test breakdown occurs, the test must potential tester. The AC high potential be repeated after reversing the dC high test should be made at 1125 volts, 50 or voltage test supply connection across the 60 Hz for one minute. The charging motor vacuum interrupter. -
Page 32: Electrical Operation Check
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 E. INSERTING THE CIRCUIT BREAKER INTO THE 5) Electrical Operation Check SWITCHGEAR EQUIPMENT The PowlVac-Nd® MA replacement circuit breaker uses a different type of secondary CAUTION CAUTION disconnect connection than that of the original circuit breaker. -
Page 33: Removing The Circuit Breaker From The Switchgear Equipment
IB-77120 interlock weldment (which is at the rear and When the breaker reaches the test position lower side of the breaker) to engage in the the foot pedal will spring back to its original space at the end of the guide rail. position. -
Page 34: Maintenance
6. When the breaker is in the disconnected position remove the secondary disconnect by unlocking the lower latch and lifting the Note: Contact Powell Service Division for interlocking lever. assistance in performing maintenance or 7. Rotate the racking position lever to the setting up a maintenance program either “withdraw position”. -
Page 35: Inspection And Cleaning
IB-77120 the rating of the circuit breaker, or once a that were performed. This record should year. begin with tests performed at the time of installation and energizing, and all data The need for scheduled inspection and should be graphed as a function of time maintenance depends on equipment to ensure a proper maintenance cycle is application conditions such as the number... -
Page 36: Mechanism Area
Wipe the insulation clean with a dry, lint-free cloth or an industrial type wiper. If dirt adheres Powell offers a complete lubrication kit and cannot be removed by wiping, remove (Powlube-102) which contains all the it with distilled water or a mild solvent such lubricants required for maintaining the as denatured alcohol. -
Page 37: Figure 6 - Lubrication
IB-77120 Figure 6 - Lubrication Close Latch Ratchet Wheel Shaft Face Jackshaft Lever Pawl Support Fundamental Pawls Linkage Pin Jackshaft Outer Motor Drive Shaft Jackshaft Trip Shaft Bearing Support Roller Needle Support Bearing Bearings Primary Spring Yoke Pin m. Wheel Disconnecting Contact Powered by Safety... -
Page 38: Figure 7 - Lubrication (Cont)
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Figure 7 - Lubrication (cont) Motor Cutoff Open Closed Flag Drive Lever Pin at Jackshaft Motor Drive Flag Support Shaft Coupling Primary Trip Secondary Prop Disconnect Contact Ground Close Shaft Camshaft w. Motor Drive Connection Support Bearing Needle Bearings... -
Page 39: Table B - Lubrication
IB-77120 (Table B) Lubrication Location Reference Figure Lubricant Method Electrical Parts Wipe clean. Apply lubricant only to Primary disconnecting device Fig 6 (k) Mobilgrease 28 actual contact surface. Wipe clean. Apply lubricant only to Ground Connection Fig 7 (t) Mobilegrease 2 actual contact surface. -
Page 40: Closing Spring Removal
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Figure 8 - Main Closing Spring Assembly Figure 9 - Main Closing Spring Assembly Installed Compressed for Removal a. Connecting Rod a. Spacer b. Flat Washer b. Flat Washer c. Lock Washer c. -
Page 41: Slow Closing Of Mechanism
IB-77120 5. Place the spacer below the bracket with Figure 10 - Primary & Secondary Trip Prop the flat washer below it. Adjustment 6. Insert screw and tighten until the tension is taken off the connecting rods. 7. With a slight rocking motion of the main closing spring assembly, the connecting rods (Figure 8, a) can now be unhooked Sight Line... -
Page 42: Mechanism Adjustments
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 5) Mechanism Adjustments To adjust the pawl perform the following steps: WARNING WARNING 1. Remove the escutcheon to gain access to the head of the bolt When any maintenance procedure requires holding the adjusting eccentric. the opening or closing of the circuit breaker 2. -
Page 43: C) Tripping System Adjustment
IB-77120 2. Adjust the primary trip prop CAUTION CAUTION adjusting screw (Figure 10, d) so that with the fundamental linkage Prior to performing any adjustment or in the reset position, the clearance maintenance procedure, all high voltage between the primary trip prop components shall be deenergized, roller and the secondary trip prop disconnected by means of a visible break, and... -
Page 44: Figure 11 - Feeler Gauge
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 12. Slowly depress the trip coil armature ii. If the circuit breaker did not TRIP using the manual charge handle. during the test performed in depress the handle until the step 12, reset the feeler gauges armature contact the feeler gauges. -
Page 45: D) Latch Check Switch Adjustment
IB-77120 d) Latch Check Switch Adjustment click of the contacts will be heard.) At the position where the click is Figure 12 - Latch Check Switch Adjustment heard hold the switch and retighten the two screws which secure the Pivot Screw latch check switch. -
Page 46: E) Adjustment Of Close Latch Shaft
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 e) Adjustment of Close Latch Shaft f) Open and Close Spring Release Lever Adjustment The close latch shaft (Figure 3, k) passes through the side sheets of the stored If the circuit breaker has rolled over an energy mechanism frame at the front of obstruction on the floor which caused and above the cam shaft. -
Page 47: Figure 13 - Primary Current Path
IB-77120 (Table C) Primary Current Path Rated Vacuum Primary Operating Breaker Rated Continuous Interrupter Disconnecting Pushrod Type (kV) Current (Amps) Assembly Device Assembly Assembly 05PV36MAX 4.76 1200 77015G01P 5uC.100.109 77017G01P 05PV36MAX 4.76 2000 77015G01P 5uC.100.107 77017G01P 05PV50MAX 4.76 1200 77015G01P 5uC.100.109 77017G02P 05PV50MAX... -
Page 48: Figure 14 - Control Devices
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 (Table D) Control Devices Primary Primary Secondary Shunt Shunt Shunt Undervoltage Charging Control Closing Coil Anti-Pump Relay Trip Coil Trip Coil Trip Coil Device Motor Voltage Assembly Assembly (5) Assembly Assembly Assembly Assembly Assembly (3 cycle) (2) -
Page 49: Table E - Miscellaneous Parts
IB-77120 (Table E) Miscellaneous Parts Description Catalog Number Illustration Auxiliary Switch Push-on Terminals 102108LN Screw Terminals 102108LP Latch Check Switch BA-2RV2-A2 Motor Cutoff Switch Assembly 77034G01P PowlVac-Nd Hardware kit 60500G24 PowlVac-Nd Lubrication Powlube-102 Powered by Safety ®... -
Page 50: Sliding Contact Finger Wear
REPAIR PROCEduRES, C. REPLACEMENT The PowlVac-Nd® MA 5kV circuit breaker PROCEduRES, 1) Vacuum Interrupter uses a multi-contact assembly located Assembly or contact the Powell Service inside the upper contact block and in direct division. contact between the moving stem of the D. -
Page 51: Timing
A. ORDERING INSTRUCTIONS source to the OPEN position. When the circuit breaker opens, record the closing 1. To order Renewal Parts from Powell, visit time. Operate the test source to the OPEN the website at www.powellind.com or call position to open the circuit breaker and 800.480.7273. -
Page 52: Recommended Renewal Parts
As a minimum, it is recommended (Figure 13, b) should only be replaced by that one set of parts be stocked per ten circuit a qualified technician or a Powell Service breakers or less. Technician. For further assistance, please contact Powell at 800.480.7273. - Page 53 IB-77120 c. using a ¾” hex open end wrench, Check the contents of the replacement loosen the ½” jam nut securing the vacuum interrupter kit. It should vacuum interrupter adaptor to the top contain the following items: of the vacuum interrupter moving stem. •...
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Page 54: Closing Coil Assembly
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 Perform the vacuum integrity test in CAUTION CAUTION Section IV. INSTALLATION, d. PLACING THE CIRCuIT BREAkER INTO SERVICE, 2) Vacuum Do NOT use the upper block to turn the Integrity, and the primary resistance test vacuum interrupter assembly into the lower in Section V. -
Page 55: Primary Shunt Trip Coil Assembly
IB-77120 3) Primary Shunt Trip Coil Assembly 4) Secondary Shunt Trip Coil Assembly This assembly is located at the bottom right This assembly is located at the bottom left side side of the mechanism, just right of the main of the mechanism, just to the left of the main closing spring (see Figure 3, f ). -
Page 56: Undervoltage Device Assembly
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 5) Undervoltage Device Assembly e. Position the new assembly in the circuit breaker. Verify that the pin on the end of the charging motor drive shaft CAUTION CAUTION engages the slot in the mechanism eccentric drive shaft. -
Page 57: Latch Check Switch
IB-77120 g. Relays that are in 250VdC closing c. Reconnect the wires to the new switch circuits are provided with voltage and fasten the switch in place with the dropping resistors. The resistor is screws and the nut plate which was mounted adjacent to the relay. -
Page 58: Auxiliary Switch
PowlVac-ND® MA 5kV Replacement Vacuum Circuit Breaker IB-77120 e. Reconnect the wiring to the terminals the switch to its mounting bracket, on the new assembly from which it was and remove the switch. Note the removed. orientation of the switch terminals prior f. - Page 59 Type MA Air Circuit Breaker March, 2007 Powered by Safety ® Powell Electrical Group Tel: ..00 • Fax: .. Servce Dvson - Houston www.powellnd.com PO Box • Houston, TX • nfo@powellnd.com ©00 Powell Industres, Inc. • All rghts reserved.
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