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September 2018

Instruction Book

IB182923EN

AMH-4.76-VR

VR-Series

Replacement Circuit Breaker

Effective

AMH-4.76-VR+ 1200A Shown

Содержание VR+ Series

Страница 1: ...September 2018 Instruction Book IB182923EN AMH 4 76 VR VR Series Replacement Circuit Breaker Effective AMH 4 76 VR 1200A Shown...

Страница 2: ...f further information is required an Eaton sales office should be consulted Sale of the product shown in this literature is subject to the terms and conditions outlined in appropriate Eaton selling po...

Страница 3: ...NTERLOCKS 14 4 7 1 ANTI CLOSE INTERLOCK 14 4 7 2 RACKING SYSTEM TRIP AND SPRING RELEASE INTERLOCKS 14 4 7 3 ACTIVE INTERLOCK 15 4 7 4 SHUTTER INTERLOCK 15 4 8 MISCELLANEOUS ITEMS 15 4 8 1 OPERATIONS C...

Страница 4: ...important that this installation and maintenance instruction booklet be read and followed closely to achieve optimum performance and a long useful circuit breaker life in its application 1 1 VISUAL IN...

Страница 5: ...ted Voltage Factor Rated Withstand ANSI Test Voltage Rated Short Circuit Maximum Sym Interrupting Capability Closing and Latching Momentary Capabilities kV MVA Amps K Low Freq kV RMS Impulse kV Peak I...

Страница 6: ...R VR Series Replacement Circuit Breaker E H I G F J H D B C C A Table 2 AMH 4 76 VR Dimensions Breaker Type Existing Breaker Rated Continuous Current at 60 Hz Amps A B C D E F G H I J AMH 4 76 VR 250...

Страница 7: ...injury and or property damage Do not work on a breaker with the secondary test coupler engaged Failure to disconnect the test coupler could result in an electrical shock leading to death personnel inj...

Страница 8: ...ker Style 94C9506G01 Racking Handle The racking handle is used to drive the racking mechanism which moves the circuit breaker into and out of the cell The original OEM racking handle will interface wi...

Страница 9: ...d indicator Push the manual trip button The breaker will trip as shown by the breaker contacts open green indicator After completing this initial check leave the closing springs discharged and breaker...

Страница 10: ...ernal View of AMH 4 76 VR AMH 4 76 VR 250 1200A Shown Front External View 1 Manual Charging Socket 5 Guide Bar 9 Push to Open Button 2 Push To Close Button 6 Breaker Contacts Indicator 10 MOC Actuator...

Страница 11: ...ment Circuit Breaker Figure 3 4 Rear External View of AMH 4 76 VR AMH 4 76 VR 250 1200A Shown Rear External View 1 Shutter Actuator 4 SURE CLOSE Spring 7 Secondary Disconnect 2 Primary Disconnect 5 Gu...

Страница 12: ...R ASSEMBLY Each vacuum interrupter assembly also referred to as pole unit is assembled at the factory as a unit to assure correct dimensional relationships between working components Three interrupter...

Страница 13: ...ND FINGERS AWAY FROM CIRCUIT BREAKER S INTERNAL PARTS WHILE THE CIRCUIT BREAKER CONTACTS ARE CLOSED OR THE CLOSING SPRINGS ARE CHARGED THE CIRCUIT BREAKER CONTACTS MAY OPEN OR THE CLOSING SPRINGS DISC...

Страница 14: ...ct opens the SR circuit so that even though the circuit breaker would subsequently open it could not be reclosed before CS C was released and remade This is the anti pump function 4 5 1 TIMING The ope...

Страница 15: ...ted by the circuit breaker shutter actuator that opens the shutter as the circuit breaker is racked into the circuit breaker compartment and closes the shutter as the circuit breaker is racked out of...

Страница 16: ...pt between Test and Connect positions OPERATION C and NO C and NC C and NO C and NO C and NC C and NO Brown Switch Black Switch Black Switch Brown Switch SWITCH TERMINAL LS1 bb LS2 aa LS2 bb LC PS1 PS...

Страница 17: ...ront Faceplate Removed VR Series Circuit Breaker Element Mechanism 1 LH Closing Spring 5 Spring Release Assembly 9 Manual Charge Socket 2 Motor Cutoff Switch 6 Shunt Trip Assembly 10 Ratchet wheel 3 L...

Страница 18: ...nkage 1 Spring Release Close Latch 6 Ratchet Wheel 11 Anti Close Interlock 2 Pole Shaft 7 Spring Crank 12 Motor Ratchet Lever 3 Closing Spring Fixed End 8 Cam Shaft 13 Spring Release Close Clapper 4 C...

Страница 19: ...Closing Spring Discharged 4 9 c Breaker Closed and Closing Spring Discharged 4 9 b Breaker Open and Closing Spring Charged 4 9 d Breaker Closed and Closing Spring Charged Charging Schematic 1 Main Li...

Страница 20: ...does not fully open or close it is time to maintain the MOC in the cell Maintenance usually means cleaning and lubricating the MOC mechanism If the MOC has seen a large number of cycles however worn c...

Страница 21: ...of the handle When charging is complete the closing crank goes over center with an audible click and the springs Charged Discharged Indicator shows Charged Remove the maintenance tool m NOTICE IF THE...

Страница 22: ...s indicator reads OPEN d Push the circuit breaker into the cell until the mechanical stop is reached this will be indicated by an audible click At this point the side plunger has fallen into the front...

Страница 23: ...uit breaker can be operated either electrically or mechanically Remove rotary racking handle before performing any testing b To further remove the circuit breaker to the disconnect position continue t...

Страница 24: ...lace Insulation Integrity Main circuit to ground Withstand 15kV 60Hz for 1 Minute 5kV Rating 27kV 60Hz for 1 Minute 8 25kV and 15kV Ratings Hi pot Tester Clean and retest or replace Control circuit to...

Страница 25: ...t is recommended that the equipment be capable of delivering 25 milliamperes for one minute The current delivery capability of 25 mA ac applies when all three vacuum interrupters are tested in paralle...

Страница 26: ...from Ohm s Law and is expressed in micro ohms Repeat for the remaining two poles The resistance should not exceed the factory test levels more than 200 as stated in IEEE C37 09 Factory test levels ar...

Страница 27: ...e Tool Mounting Testing Locations by Circuit Breaker Type CIRCUIT BREAKER DESIGNATION APPROXIMATE MECHANISM CHASSIS WIDTH INCH LOWER MOUNTING HOLE LOWER MOUNTING HOLE MARKER PLACEMENT HOLE AM4 16 VR 1...

Страница 28: ...on a sheet of paper that can be kept as a record of the test Record the date of the test person conducting the test circuit breaker serial number and the operations counter on the tape or paper Figur...

Страница 29: ...Marker CloSure Tool TM 15O 15O Figure 6 13 Determining the Distance Traveled Figure 6 14 Illustrative Testing Tape Sample Figure 6 12 Evaluate the CloSure Performance Date of Breaker Operations CloSu...

Страница 30: ...lement requires maintenance only once every ten years or ten thousand operations which ever comes first After a ten year service interval or when ten thousand operations have been reached contact your...

Страница 31: ...or burned Motor Cut Off Contacts open or burned Trip Coil Assembly Clapper fails to reset Closing sound but no close Pole Shaft Not open fully Trip Latch Reset Spring Damaged or missing Trip Bar D Sha...

Страница 32: ...SWITCH Breaker Auxiliary Switch 94C9525G13 5 BREAKER POSITION SWITCH Breaker Position Switch PS1 94C9525H06 6 BREAKER POSITION SWITCH Breaker Position Switch PS2 94C9525H07 7 LATCH CHECK SWITCH Latch...

Страница 33: ...33 Instruction Book IB182923EN September 2018 www eaton com AMH 4 76 VR VR Series Replacement Circuit Breaker...

Страница 34: ...vard Cleveland OH 44122 United States Eaton com 2018 Eaton All Rights Reserved Printed in USA Publication No IB182923EN September 2018 Eaton is a registered trademark All trademarks are property of th...

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