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Effective April 2018 Revision #7Instruction Booklet IB02102002E

Instructions for installation, operation, and maintenance of type MVS2/MVS2-c load interrupter switches used in MVS switchgear assemblies: 4.76 kV and 15.0 kV

ContentsDescription Page

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Inspection before startup, MSV2/MVS2-c switch . . . . . . . . . . . . . . . . . . . . . . 7Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Low voltage control devices and wiring . . . . . . . 13Motor operation . . . . . . . . . . . . . . . . . . . . . . . . . . 13Bolt tightness for connections to terminal pads . 14Electromechanical stored energy release (shunt trip) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Typical MSV2/MVS2-c Switch.

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Instruction Booklet IB02102002EEffective April 2018

Revision #7

Instructions for installation, operation, and maintenance of type MVS2/MVS2-c load interrupter switches used in

MVS switchgear assemblies: 4.76 kV and 15.0 kV

EATON www.eaton.com

Disclaimer of warranties and limitation of liabilityThis instruction booklet is published solely for information purposes and should not be considered all-inclusive . If further information is required, you should consult an authorized Eaton sales representative .

The sale of the product shown in this literature is subject to the terms and conditions outlined in appropriate Eaton selling policies or other contractual agreement between the parties . This literature is not intended to and does not enlarge or add to any such contract . The sole source governing the rights and remedies of any purchaser of this equipment is the contract between the purchaser and Eaton .

NO WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, OR WARRANTIES ARISING FROM THE COURSE OF DEALING OR USAGE OF TRADE, ARE MADE REGARDING THE INFORMATION, RECOMMENDATIONS, AND DESCRIPTIONS CONTAINED HEREIN.

In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or otherwise for any special, indirect,incidental, or consequential damage or loss whatsoever, including but not limited to damage or loss of use of equipment, plant or power system, cost of capital, loss of power, additional expenses in the use of existing power facilities, or claims against the purchaser or user by its customers resulting from the use of the information, recommendations, and description contained herein .

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Read and understand these instructions before attempting installa-tion, operation, or maintenance of this equipment . This equipment must be installed and serviced only by qualified electrical personnel . Retain this document for future use .

WARNINGHAZARD OF ELECTRICAL SHOCK OR BURN. OPERATING THE SWITCHGEAR ASSEMBLY OUTSIDE OF ITS RATINGS MAY CAUSE FAILURE RESULTING IN PROPERTY DAMAGE, SEVERE PERSONAL INJURY, OR DEATH. THE SWITCH-GEAR ASSEMBLY MUST BE OPERATED WITHIN ITS NAMEPLATE RATINGS.

WARNINGHAZARDS OF ARC FLASH, ARC BLAST, AND ELECTRIC SHOCK EXIST WHEN THIS EQUIPMENT IS ENERGIZED, WHICH MAY LEAD TO DEATH OR SEVERE INJURY. ALL WORK ASSOCIATED WITH THIS ELECTRICAL EQUIPMENT MUST BE PERFORMED ONLY BY QUALIFIED PERSONNEL AS DEFINED IN NFPA-70. CONSULT NFPA-70E, OSHA, AND ANY OTHER APPLICABLE REGULATION PERTAINING TO OPERATOR SAFETY PRIOR TO SERVICING EQUIPMENT. THE QUALIFIED PERSONNEL MUST FOLLOW ALL APPLICABLE PERSONAL PROTECTIVE EQUIPMENT REQUIREMENTS. DO NOT ATTEMPT ANY WORK ON THIS EQUIPMENT SUCH AS INSTALLING COMPONENTS, PERFORMING ANY EXAMINATIONS, PERFORMING ANY ADJUSTMENTS, PERFORMING ANY SERVICING, OR PERFORMING ANY MAINTENANCE WHILE IT IS ENERGIZED. BEFORE PERFORMING ANY WORK, FOLLOW ALL APPROPRIATE HAZARD ASSESSMENT AND ENERGY CONTROL PRECAUTIONS AND PROCEDURES. VERIFY NO VOLTAGES ARE PRESENT ON ALL INCOMING AND OUTGOING CONDUCTORS, AND ANY ENERGY SOURCES CONTAINED WITHIN THE EQUIPMENT PRIOR TO SERVICING, THEN GROUND (CONNECT TO EARTH) ALL INCOMING AND OUTGOING CONDUCTORS ATTACHED TO THIS EQUIPMENT AND TO ANY INTERNAL ENERGY SOURCES.

DANGERALL APPLICABLE SAFETY CODES, SAFETY STANDARDS, AND SAFETY REGULATIONS MUST BE ADHERED TO WHEN INSTALLING, OPERATING, OR MAINTAINING THIS EQUIPMENT.

Section 1: IntroductionRead and understand these instructions before attempting any installation, operation, or maintenance of an MVS2/MVS2-c switch.

1.1 Purpose

This instruction book is expressly intended to cover the installa-tion, operation, and maintenance of MVS2/MVS2-c load interrupter switches . It is not encompassing of all possible contingencies, variations, and details that may arise during installation, operation, or maintenance of this equipment .

1.2 Application and description

The Eaton type MVS2/MVS2-c load interrupter switch consists of an air insulated, three-pole, gang-operated, quick-make, quick-break, load interrupter switch . The type MVS2/MVS2-c switch is used in MVS switchgear and is rated 4 .76 kV maximum or 15 kV maxi-mum, 600 amperes continuously or 1200 amperes continuously . Applications of the MVS2/MVS2-c switch used in MVS switchgear assemblies are general power distribution, transformer primary dis-connect device, power system control and automation, etc . MVS2/MVS2-c switches, in conjunction with MVS switchgear, have several built-in interlocks and safety features .

Most versions of the MVS2/MVS2-c switch have either Underwriters Laboratory (UL) Incorporated recognized component status or Canadian Standards Association (CSA) recognized component status .

1.3 Documentation references

For further information on installation and application, refer to the applicable descriptive bulletins, publications, and/or industry stan-dards .

Download Eaton information from www .eaton .com .

1.4 Eaton contact information

For additional information about Eaton products please call 1-800-525-2000 or log onto www .eaton .com . Additional Medium Voltage Switchgear information regarding Pricing/Aftermarket, Customer Service, Engineering/Technical Information, or Warranty, can be found by calling 1-800-345-4072 .

Eaton Electrical Services and Systems (EESS) can be reached at 1-800-498-2678 .

If further information is desired regarding this particular installation or application information, contact the local Eaton sales office, refer-ence Eaton’s Consulting Application Guide, or the appropriate indus-try standards .

1.5 Terminology

Operating handle: It is a rod approximately 18 in . (457 .2 mm) long stored on the main door of the MVS switchgear behind a small mechanism access door . It is inserted into the operating mechanism when the switch is to be opened or closed .

MVS2/MVS2-c: A switch applied in MVS switchgear assemblies .

Load interrupter: A switch feature that interrupts at the maximum rated continuous current . Short-circuit or overcurrent protection must be provided by fuses or circuit breakers .

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Figure 1. Exploded View of a Typical MVS2/MVS2-c Switch.

1.6 Safety precautions

Only qualified electrical workers with training and experience on high voltage circuits should be permitted to work on this equip-ment. They should be familiar with the work to be performed, the safety equipment required, and hazards involved.

1 . Read and understand these instructions before attempting any assembly, operation, or maintenance of an MVS2/MVS2-c switch .

2 . Disconnect all low voltage and medium voltage power sources before working on the equipment per Occupational Safety and Health Act (OSHA) and local lockout and tag out procedures . Verify voltages have been removed; ground load and line side connections . Observe the National Fire Protection Association’s (NFPA) Publication #70 that is commonly known as the National Electrical Code (NEC), OSHA, and local procedures and stan-dards . This includes visual inspections while the vertical section door is open, making any adjustments inside or outside the switchgear vertical section, performing maintenance, or installing replacement parts .

3 . The vertical section door cannot be opened with the switch in the CLOSED position . In addition, the switch cannot be closed with the vertical section door open .

4 . Before opening the door of the vertical section, look through the window on the door to ensure that all three main blades and flicker blades are OPEN . If necessary, use an additional suitable light source .

WARNINGDEFEATING OR DISENGAGING SAFETY INTERLOCKS ON AN MVS2/MVS2-C SWITCH THAT IS PROPERLY INSTALLED IN AN MVS SWITCHGEAR ASSEM-BLY AND CONNECTED TO A POWER SOURCE MAY RESULT IN PROPERTY DAMAGE, BODILY INJURY, OR DEATH. DO NOT DEFEAT OR DISENGAGE ANY SAFETY INTERLOCKS WHEN THE SWITCHGEAR IS IN SERVICE.

Before energizing an MVS2/MVS2-c switch in an MVS switchgear assembly:

1 . Be sure the MVS switchgear assembly is securely fastened to a level surface according to the floor plan of the customer draw-ings .

2 . The finished foundation surface shall be flat and level within 0 .06 in . [1 .6 mm] in 36 in . [914 mm] in any direction, left to right, front to back, and diagonally . Alternatively a local flatness "FF" value of 50 or higher and an accompanying "FL" value of 37 to 40 as defined in industry standard ASTM-E1155-96 and industry standard ACI 117-90 may be used to establish the flatness and levelness of the finished foundation .

3 . Always be sure that all hardware is in place and secured by tightening or putting on safety fasteners before putting an MVS2/MVS2-c switch into operation . See Section 7 for recommended torque specifications .

4 . Confirm that all arc chutes and barriers are installed .

5 . Confirm that no tools or other objects have been left inside the switch compartment .

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6 . Confirm that all devices, doors, and covers are in place .

7 . Before start up, perform a power frequency withstand (Hi-Pot) test according to IEEE C37 .20 .3 section 6 .2 . Refer to Table 1 in C37 .20 .3 for appropriate voltage and insulation levels .

1.7 Switch identification

A rating label is located on the mechanism cover of each type MVS2/MVS2-c switch . Contained on this label are the switch style or catalog number and all the switch ratings required by industry stan-dards . This information should be given to the Eaton sales office if a question should arise concerning the switch or if renewal parts are required .

WARNINGEXCEEDING THE NAMEPLATE RATINGS OF AN MVS2/MVS2-C SWITCH MAY CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH DO NOT APPLY AN MVS2/MVS2-C SWITCH BEYOND ITS NAMEPLATE RAT-INGS.

Figure 2. Typical Rating Label.

1.8 Safety features

The manually operated version of the type MVS2/MVS2-c load interrupter switch is manufactured with several built-in interlocks and safety features to reduce hazards and provide proper operating sequences .

ote:N For motor operated switches, refer to Section 6 . For shunt trip switch-es, refer to Section 7 .

1 . A mechanical interlock prevents opening the front enclosure door when the switch is in the closed position .

2 . A switch interlock prevents inadvertent closing of the switch when the front enclosure door is open .

3 . The switch design includes provisions for padlocking the switch in the open or closed position .

4 . Mechanical indicators show whether the switch is open or closed .

5 . The switch design includes key interlock provisions for the addi-tion of key interlocks to force a sequence of operation .

1.9 Ratings and standards

Table 1. MVS2/MVS2-c Switch Voltage and Frequency Ratings, Rms Values.

Description 4.76 kV Class 15 kV Class

Rated Maximum Design Voltage 4.76 kV 15 kV

Impulse Withstand Voltage, BIL* 60 kV 95 kV

Power Frequency Withstand Voltage 19 kV 36 kV

Rated Frequency 60 Hz 60 Hz

* Basic Impulse Level

Table 2. 4.76 kV Class MVS2/MVS2-c Switch Current Ratings for 600 A Continuous Current Rating (Rms Symmetrical Values Except as Noted).

For the Unfused Fault-Close Current Rating, Peak 63.8 kA 97 kA

Related Capability Rating Rating

Short Time Current Rating, 2 sec. 25 kA 38 kA

Rated Load Break Current 600 A 600 A

Rated Load Break Current Operations 50 50

Rated Magnetizing Current 12 A 12 A

Fused Fault-Close Current Rating, RBA200 Fuses, Peak Value

48.4 kA 48.4 kA


95.6 kA 95.6 kA


95.6 kA 95.6 kA

Fused Fault-Close Current Rating, CLE 10 A - 450 A Fuses, Peak Value

160.6 kA 160.6 kA

Fused Fault-Close Current Rating, CLE 600 A or 750 A Fuses, Peak Value

63.8 kA 102 kA

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Table 3. 4.76 kV Class MVS2/MVS2-c Switch Current Ratings for 1200 A Continuous Current Rating (Rms Symmetrical Values Except as Noted).



Short Time Current Rating, 2 sec. 25 kA 38 kA





48.4 kA 48.4 kA


95.6 kA 95.6 kA


95.6 kA 95.6 kA

Fused Fault-Close Current Rating, CLE 10 A – 450 A Fuses, Peak Value

160.6 kA 160.6 kA

Fused Fault-Close Current Rating, CLE 600 A or 750 A Fuses, Peak Value

63.8 kA 102 kA

Fused Fault-Close Current Rating, CLE 1100 A Fuses, Peak Value

63.8 kA 80.3 kA

Table 4. 15 kV Class MVS2/MVS2-c Switch Current Ratings for 600 A Continuous Current Rating (Rms Symmetrical Values Except as Noted).



Short Time Current rating, 2 sec. 25 kA 38 kA




Fused Fault-Close Current Rating, RBA200 Fuses, Peak Value 36.7 kA 36.7 kA

Fused Fault-Close Current Rating, RBA400 Fuses, Peak Value 63.8 kA 75 kA


Fused Fault-Close Current Rating, ”HRBA400” Fuses @ 14.4 kV Max, Peak Value

63.8 kA 88.7 kA

Fused Fault-Close Current Rating, “HRBA800” Fuses @ 14.4 kV Max, Peak Value

63.8 kA 88.7 kA


160.6 kA 160.6 kA

Table 5. 15 kV MVS2/MVS2-c Switch Current Ratings for 1200 A Continuous Current Rating (Rms Symmetrical Values Except as Noted).



Short Time Current rating, 2 sec. 25 kA 38 kA




Fused Fault-Close Current Rating, RBA200 Fuses, Peak Value 36.7 kA 36.7 kA



Fused Fault-Close Current Rating, ”HRBA400” Fuses @ 14.4 kV Max, Peak Value

63.8 kA 88.7 kA

Fused Fault-Close Current Rating, “HRBA800” Fuses @ 14.4 kV Max, Peak Value

63.8 kA 88.7 kA


160.6 kA 160.6 kA

Table 6. MVS2/MVS2-c Switch Standards.

Standards Document

UL or CSA Component Recognition to:

ANSI/IEEE C37.20.4ANSI C37.58 ANSI C37.22

CSA Component Recognition Only to:

CAN/CSA C22.2 No 193 CAN/CSA C22.2 No 58

ote:N American National Standards Institute (ANSI), Institute of Electrical and Electronic Engineers (IEEE) .

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Section 2: Inspection before startup, MSV2/MVS2-c switch

ote:N Each switch is properly adjusted at the factory before shipment . However, vibration and mechanical stresses imposed by transit and instal-lation can adversely affect switch adjustment . Therefore, an inspection is essential before energizing the switch . If this inspection reveals the switch has come out of adjustment, the switch should be readjusted according to alignment procedures in Section 4 .3 .

Inspection procedures require closing and opening the switch with the main door open . This requires overriding the switch safety interlocks as described in Section 4 .3 .1 and must be accomplished before energizing the switch .

Figure 3. Main Blade Adjustment.

1

2

3

Description of Figure 3 balloons

1 . Arc Chute

2 . Flicker Blade

3 . Main Blade

2.1 Initial inspection procedure

Step 1: Main and flicker blades must be in proper alignment with the break jaws and arc chute openings respectively . This can be checked by slowly closing the switch with the maintenance hub (see Figure 4), observing the main blade and flicker blade alignment with the break jaw and the arc chute on each phase . If the main blades go onto the break jaws (a misalignment of ± 0 .06 in . [1 .52 mm] left or right is permitted) and the flicker blades enter the arc chutes with-out impacting a side plate of an arc chute (a misalignment of ± 0 .06 in . [1 .52 mm] left or right is permitted), the align-ment is satisfactory .

When opening the switch, hold onto the handle . Each flicker blade should remain captive in its arc chute until the main blade it is mounted to has opened far enough to stop flicker blade rotation . At that time, each flicker blade should “snap” out of its arc chute .

Step 2: When fuse mountings are supplied, check to ensure the fuse mountings are securely fastened and fuses are securely clamped in place

Step 3: When Eaton type RBA fuses are provided, check to ensure the discharge filters or condensers on the fuses have been securely hand tightened .

Step 4: Follow the procedures in Section 4 .2 .5, paying particular attention to the insulators and insulating material .

Step 5: A final thorough inspection should be made to ensure that no tools or other objects have been accidentally left inside the enclosure .

Figure 4. Pipe-like Maintenance Hub Welded to the Switch Shaft.

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Section 3: Operation3.1 Mechanical safety interlocks

WARNINGDEFEATING OR DISENGAGING SAFETY INTERLOCKS ON AN MVS2/MVS2-C SWITCH THAT IS CONNECTED TO A POWER SOURCE MAY RESULT IN PROPERTY DAMAGE, BODILY INJURY, OR DEATH. DO NOT DEFEAT OR DISENGAGE ANY SAFETY INTERLOCKS.

The manually operated MVS2/MVS2-c switch is equipped with switch interlocks and door interlocks, as well as provisions for pad-locking the switch in either the open or closed position .

3.1.1 Door/switch mechanism interlock

This interlock prevents inadvertent closure of the switch if the enclo-sure door is open . When the door is closed, a bracket fastened to the inside of the door moves the interlock latch out of the blocking position (see Figure 5) .

Figure 5. Door/switch Mechanism Interlock Location.

3.1.2 Door/switch shaft interlock

This interlock prevents the door of the enclosure from being opened when the switch is closed . When the switch is closed, a hooking cam welded to the operating shaft engages an L-shaped bracket fastened to the inside of the switch door, preventing the door from being opened (see Figure 5) .

3.1.3 Key interlocking, MVS2/MVS2-c switch

When the switch is provided with key interlocks, refer to the job drawings for key interlocking schemes and explanation .

Door/Switch Shaft Interlock

Door/Switch Mechanism Interlock

3.2 Switch operation

CAUTIONOPERATING AN MVS2/MVS2-C SWITCH WITH A KEY INTERLOCK BOLT EXTENDED WILL RESULT IN EQUIPMENT DAMAGE AND MAY ALSO EXPOSE A PERSON TO BODILY INJURY OR DEATH. THE KEY MUST BE INSERTED INTO THE INTERLOCK AND ROTATED TO RETRACT THE LOCKING BOLT BEFORE OPERATING AN MVS2/MVS2-C SWITCH.

To manually close or open an MVS2/MVS2-c switch, the operating handle is inserted into the handle casting and rotated up or down as appropriate . This charges the compression spring, and as the spring lever goes over toggle, the stored energy of the spring is transferred to the shaft that snaps the switch open or closed . The blades thus move at a predetermined speed that is independent of the operator .

The quick-make mechanism provides power to overcome the blow-out forces that occur if the switch is closed into a fault . However, these forces are not transmitted to the operating handle since it is not rigidly connected to the blades . Therefore, the switch can be safely closed under short-circuit conditions within its fault-close rat-ing .

Load interruption is accomplished by flicker blades and contact fin-gers located inside a DE-ION arc chute . On opening the switch, the main blades open first and all current is shunted through the spring loaded flicker blades . Further travel of the main blades causes the flicker blades to snap out of their contact fingers . Arcing takes place within the arc chutes between the contact fingers and flicker blades . See Figure 6 for the sequence of operation .

Figure 6. Main and Flicker Blade Operation.

Left Pole: Main Blade and Flicker Blade Closed .

Center Pole: Main Blade Open, Flicker Blade Closed .

Right Pole: Main Blade and Flicker Blade Open .

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Section 4: Maintenance4.1 Inspection schedule

An MVS2/MVS2-c switch should be thoroughly inspected prior to initial energizing as discussed in Section 2 . Every year thereafter, a routine inspection to clean, lubricate, and check for signs of wear and tear, damage, etc ., is recommended as described in this sec-tion . If any problems are discovered, they should be corrected by following procedures in Sections 4 .2, 4 .3, and 4 .4 . After the number of interruptions at the rated current (see Table 2,Table 3,Table 4, andTable 5 for the rated number of switching operations) has been done (even if the current being switched is less than the switch’s capability), or after the switch has been exposed to fault current, the switch should be thoroughly inspected at the first opportunity . If the switch has been moved or otherwise subjected to mechanical strain, inspection procedures described in Section 2 should be performed .

4.2 Inspection procedure

WARNINGFAILURE TO COMPLETELY DISCONNECT THE SWITCH FROM ALL POWER SOURCES PRIOR TO INSPECTION MAY RESULT IN SEVERE INJURY OR DEATH. AN MVS2/MVS2-C SWITCH MUST BE COMPLETELY DISCONNECTED FROM ALL POWER SOURCES AND GROUNDED BEFORE PERFORMING ANY INSPECTION.

4.2.1 Main blade and flicker blade contact inspection

Step 1: Check main blades and flicker blades for arc erosion . Severely damaged blade assemblies should be replaced as described in Section 4 .4 .1 .

Step 2: If flicker blades are pitted from arc erosion, they may be smoothed with a few light strokes of a fine file .

ote:N No attempt should be made to file out pit marks . Do not use abrasive material for cleaning as small bits of abrasive material may cause the contacts to overheat during the interruption process .

ote:N The main blade current carrying contact surfaces should not be filed. Opening and closing the switch will keep them clean .

Step 3: If the main blade current-carrying contact surfaces are burned, they MUST be replaced .

4.2.2 Arc chute inspection

Step 1: Inspect the arc chute sides for cracks or erosion and replace if damaged .

Step 2: Use a flashlight to examine the arcing contacts inside the arc chute . If contacts are burned or pitted over half their surfaces, or if the contacts are out of alignment, the arc chute should be replaced .

4.2.3 Flicker blade engagement check

WARNINGSLOW CLOSING OR SLOW OPENING THE SWITCH AGAINST THE SPRING MAY RESULT IN BODILY INJURY IF A PERSON IS NOT CAREFUL TO HOLD THE OPERATING HANDLE FIRMLY. BE SURE TO HOLD THE HANDLE FIRMLY WHILE PERFORMING SLOW CLOS-ING OR SLOW OPENING OPERATIONS.

Step 1: Close the switch .

Step 2: Insert the removable handle in the pipe-like mainte-nance hub welded to the switch shaft (see Figure 4) and slowly open the switch . Each flicker blade should remain engaged in the contact fingers inside the arc chute while the main blade assembly opens .

Step 3: Shortly after each main blade assembly parts from its break jaw, the flicker blade bracket strikes a stop on the main blade assembly which starts to pull the flicker blade out of the contact fingers in the arc chute . Each flicker blade will then snap open from the energy stored in the charged torsion spring .

4.2.4 Interphase barrier inspection

Step 1: Check the interphase barriers for carbon or metallic depos-its .

Step 2: Replace if deposits are present .

4.2.5 Electrical parts and insulation check

WARNINGFAILURE TO COMPLETELY DISCONNECT THE SWITCH FROM ALL POWER SOURCES PRIOR TO INSPECTION MAY RESULT IN SEVERE INJURY OR DEATH. AN MVS2/MVS2-C SWITCH MUST BE COMPLETELY DISCONNECTED FROM ALL POWER SOURCES AND GROUNDED BEFORE PERFORMING ANY INSPECTION.

Step 1: De-energize the primary circuits before removing any enclosure parts .

Step 2: Before cleaning, take “MEGGER” readings between live parts and to ground .

Step 3: Inspect for signs of overheating or weakened insulation .

Step 4: Remove dust from live parts, insulators, drive rod links, and enclosure surfaces . Wipe clean with isopropyl alcohol or distilled water, then wipe dry .

CAUTIONISOPROPYL ALCOHOL IS FLAMMABLE. PROVIDE ADEQUATE VENTILATION AND KEEP AWAY FROM FLAMES AND OTHER IGNITION SOURCES. CONSULT YOUR SAFETY DEPARTMENT BEFORE USING.

Step 5: After the live parts, insulators, and drive rod links have been dusted and wiped clean, take “MEGGER” readings again between the live parts and between phases . Keep a record of these reading for future reference in determining when trends occur that would indicate a lowering of the insulation resistance .

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ote:N Periodic high potential tests are not required after initial start-up and are recommended only after repair of high voltage live parts or insulation, or when the trend of “MEGGER” readings indicates it to be advisable . This field test should be made before the main cables are connected and should not exceed the values in the following table .

Table 7. Field Dielectric Test Values.

kV Class

Test Voltage, 60 Hz AC, Applied for 1 Minute

4.76 14.25

15 27

4.2.6 Mechanical operation check

Step 1: Close and open the de-energized switch at least three times to check the performance of the operating mecha-nism .

4.3 Alignment procedures

Check each of the following items for adjustment/alignment . If out of adjustment/alignment, follow the instructions given .

WARNINGFAILURE TO COMPLETELY DISCONNECT THE SWITCH FROM ALL POWER SOURCES PRIOR TO INSPECTION MAY RESULT IN SEVERE INJURY OR DEATH. THE SWITCH MUST BE COMPLETELY DISCONNECTED FROM ALL POWER SOURCES AND GROUNDED BEFORE PERFORMING INSPECTION AND MAINTENANCE.

4.3.1 Override of door/switch mechanism interlock (manual operated switch only)

To operate the switch with the door open, the interlock (see Figure 7) must be disengaged . To close the switch, insert the handle into the handle casting and push upward, at the same time push the latch on the left side of the safety barrier downward until the handle casting clears the interlocking pin . Reverse this procedure to open the switch .

Figure 7. Override of Switch Interlock Safety Latch.

4.3.2 Main blade and arc chute alignment

Refer to Figure 3 and Figure 9 when performing this procedure .

Step 1: Loosen the four hinge bolts (bottom of photo), the two break jaw bolts (top of photo), and the two arc chute mounting bolts .

Step 2: For each pole (as necessary), remove the clevis pin holding the drive rod link to its main shaft lever .

Figure 8. Clevis Pin Holding the Drive Rod Link to Its Main Shaft Lever.

Step 3: Push the switch blade assembly towards the closed posi-tion until the blades touch the break jaw and the flicker blade is to the point of entering its arc chute .

Step 4: Move the blade and break jaw to where they are in align-ment, and move the arc chute to the position of where the flicker blade will enter the arc chute, and then push the blade onto the break jaw . This may require use of a mallet .

Step 5: Align the terminal pads with a straight edge . Tighten the bolts on the hinge, break jaw, and arc chute to 25 ft-lbs (33 .9 N•m) .

Step 6: After performing this for all three poles, pull each blade assembly off its break jaw and reconnect the drive rod link to its shaft ears by replacing the clevis pin removed in Step 2 .

Step 7: Insert the handle into the maintenance hub then rotate the shaft to the closed position and verify the switch meets the criteria in Section 2 . If the switch contacts are still misaligned, repeat this procedure as necessary or contact Eaton .

Drive Rod Link

Clevis Pin

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4.3.3 Break jaw bolt and hinge contact bolt tightness

The disk springs on the main blade assembly must provide the nec-essary contact pressure between the main blades and stationary mating parts when the switch is closed (see Figure 9) At the break jaw end, the jam nut must be removed, then a sensitive torque wrench used to set the proper contact pressure as given in Table 8 .

Table 8. Proper Contact Pressure.

Fault-Close Rating kA Peak

Torque in-lbs (N•m)

63.8 20 (2.26)

97 25 (2.83

The jam nut at the hinge end must be tightened to a value of 7 in .-lbs (0 .79 N•m) pounds .

Standard ohm readings between the top terminal pad and the bot-tom terminal pad on each pole are not to exceed 60 micro ohms .

Figure 9. Main Blade and Arc Chute Alignment.

4.4 Replacement procedures

WARNINGFAILURE TO COMPLETELY DISCONNECT THE SWITCH FROM ALL POWER SOURCES PRIOR TO INSPECTION AND / OR MAINTENANCE MAY RESULT IN SEVERE INJURY OR DEATH. THE SWITCH MUST BE COMPLETELY DISCONNECTED FROM ALL POWER SOURCES AND GROUNDED BEFORE PERFORMING INSPECTION AND MAINTENANCE.

4.4.1 Main blade subassembly and break jaw replacement

The switch should be in the closed position . Disconnect the drive rod link from the main blade assembly by removing the clevis pins . (See Figure 8) .

Figure 10. Main and Flicker Blade Replacement.

For the following procedure, refer to Figure 10 .

Step 1: Remove components fastened to the hinge end terminal pad and retain for later re-installation .

Step 2: Remove the four bolts "A" holding the stationary hinge parts and the terminal pad to the insulator . Retain the terminal pad for later re-installation with the new blade and hinge assembly .

Step 3: Remove the two bolts "B" holding the break jaw to the upper terminal . The jaw is now disengaged .

Step 4: Replace the jaw but only finger tighten its two mounting bolts at this time .

Step 5: Install the new main blade assembly and terminal pad to the insulator by installing the four bolts but only finger tightening them at this time .

B

A

2 BOLTS

4 BOLTS

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Step 6: Align each blade following the instructions given in Section 4 .3 .2 .

Step 7: Tighten the jaw mounting bolts .

Step 8: Tighten the blade and hinge assembly mounting bolts .

Step 9: Install all previously retained components fastened to the terminal pad .

Step 10: Align the flicker blade and arc chute following the instruc-tions given in Section 4 .2 .3 .

Step 11: Check the flicker blade functioning following the instruc-tions given in Section 4 .1 .3 . If the functioning is satisfac-tory, connect the drive rod to main blade .

Step 12: Check the switch for adjustments following the instruc-tions given in Sections 4 .2 .1 through 4 .2 .4 .

Step 13: Perform the pre-operation check detailed in Section 3 .4 .

4.4.2 Spring replacement

The main spring is a large compression spring along the inside of the switch frame on the operating handle side (see Figure 11) . For several higher fault-close ratings, there is also an auxiliary spring connected to the other end of the main shaft . If possible, close the switch before removal of either spring .

Figure 11. Stored Energy Spring Replacement or Adjustment.

4.4.2.1 Main spring replacement

Step 1: To disengage the main spring, remove the switch mecha-nism cover (see Figure 4) .

Step 2: Take a 5/16”-18 threaded rod 4 .0 in . (101 .6 mm) long and screw it into the rear end of the spring rod .

Step 3: Make a spacer 3 .0 in . (76 .2 mm) long from a pipe or tube with a 1 .0 in . (25 .4 mm) inside diameter . Put this over the 5/16" rod and the main spring rod .

Step 4: Take a washer with an outside diameter larger than the spacer and place it on the rod .

Step 5: Turn a 5/16”-18 nut onto the rod until it is hand-tight and then center the spacer .

Step 6: Use a tool to tighten the nut until the tension on the pin at the front of the spring rod is released .

Step 7: Remove one or both of the retaining E-rings holding the pin in place and remove the pin . The spring assembly is now disengaged from the shaft .

Step 8: Loosen the 5/16”-18 nut on the piece of all-thread rod to relieve the tension .

Step 9: Remove the piece of all thread from the spring rod . The rod and spring may now be removed .

Step 10: To install the main spring assembly, reverse this procedure .

4.4.2.2 Auxiliary spring replacement

Step 1: To remove the auxiliary spring, put switch in closed posi-tion . While the compression spring is in its longest con-dition, remove the clevis pin and cotter pin holding the spring retaining rod to the small arm of the main shaft .

Step 2: Pull the spring rod away from the main shaft levers and its rear support . The rod and spring are now disengaged .

Step 3: To install the auxiliary spring, reverse this procedure with the switch in the closed position .

4.4.3 Main shaft replacement

Step 1: Remove the barriers from the switch .

Step 2: Disconnect and remove the switch from the enclosure and set on a sturdy workbench . To remove the switch from the enclosure will require removal of the screen barrier assem-bly, then removing the four bolts that fasten the switch to the vertical section mounting rails .

Step 3: Remove all springs as directed in Section 4 .3 .2 .

Step 4: Remove all drive rod link connections by removing the cot-ter pins and clevis pins (see Figure 8) .

Step 5: Remove the barrier support angle .

Step 6: Remove the 1/4”- 20 bolts in the ends of the shaft . The shaft is now disengaged and may be removed from the switch .

Step 7: Reverse this procedure to replace the main shaft assembly .

4.5 Pre-use check

After completing any maintenance, the alignment should be checked (see Section 4 .1) . After completing any alignment, the switch should be put through at least three "Close-Open" operations to check for proper performance .

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4.6 Lubrication

Lubrication should be done during switch maintenance (see Section 4) . In general, the switch requires only moderate lubrication . All excess lubrication must be removed with a clean cloth to prevent any accumulation of dust or dirt . Avoid any lubrication on insulation .

Conductive grease (Eaton part number 7274A48H02) should be applied sparingly to contact surfaces on break jaw and between blade and hinge .

Eaton grease 53701AI should be applied to the spring rod(s) at the stationary end pivots .

If the handle casting and/or the spring lever is dragging the switch contacts open or closed, when the switch is opened or closed, one of the following methods must be used to correct this problem .

4.6.1 Preferred lubrication method

Step 1: Remove the shaft (see Section 4 .4 .3) .

Step 2: Disassemble the rotating components on the shaft . This may require wetting with a spray lubricant or mineral spirits to soften it before the parts can be removed .

Step 3: Clean the machined ends of the shaft and the rotating parts that fit on the shaft .

Step 4: Re-lubricate all rotating parts .

Step 5: Reassemble the shaft .

Step 6: Reinstall the shaft (see Section 4 .4 .3) .

4.6.2 Alternate lubrication method

Step 1: Wet the rotating parts on the shaft and the ends of the shaft with a spray lubricant and let it set for 15 minutes .

Step 2: Begin to work the rotating parts on the shaft back and forth about 45 degrees of travel while holding the shaft in position with a handle in the maintenance hub . If the parts are very stiff or “frozen”, it may be necessary to repeat this several times before the spray lubricant softens the hard-ened lubricant to allow the parts to rotate freely .

Step 3: Once the parts are disengaged, add a few drops of syn-thetic lubricating oil and let it wick into the mating sur-faces .

Step 4: Wipe off any the excess oil .

ote:N Using this alternative lubrication method will require more attention to periodic maintenance to assure the mechanism works correctly . The mecha-nism should be re-oiled with synthetic lubricating oil at regular intervals, mak-ing sure any excess oil is wiped off .

Section 5: Low voltage control devices and wiring5.1 Auxiliary switch

The MVS2/MVS2-c switch can be equipped with an optional auxil-iary switch . This switch requires no adjustments . Up to 5a and 5b contacts are available for switchgear specific requirements and for customer use .

5.2 Other apparatus

See instruction bulletin IB02102001E, in conjunction with other order specific documents, for applicable low voltage electrical information for MVS switchgear .

Section 6: Motor operationA motor operated switch operates identically as a manually oper-ated switch . The mechanical interlocks are replaced with a key type door interlock and a key type mechanism interlock that has an integral low voltage contact switch assembly to disconnect the motor power when the switch is locked open . Only one key can be used . Any extra keys must be either put in a safe and secure place or destroyed to prevent exposure to energized high voltage compo-nents .

Follow the recommendations in Sections 2 and 3 for commission-ing the switch and checking operation . It is recommended this be done with the manual operating handle prior to using the electrical actuator to open and close the switch . After the switch mechanism is verified to be operating correctly with the manual handle, the motor actuator can be connected and the switch operation checked electrically . It may be necessary to consult the electrical drawings provided with the MVS switchgear to determine how the electrically operated switch mechanism is to function as there may be several interlocking electrical contacts .

6.1 Hand operation of a motor operated switch

A special pin connects the linear actuator to the switch operator . Loosen the screw holding the pin in place and remove this pin . If too much pressure is applied to the pin to remove, place the maintenance handle into the maintenance hub and lift up slightly to relieve the pressure . This pressure will allow the pin to be removed . Remove the bottom support pin holding the linear actuator, pull it out sufficiently to permit unplugging the linear actuator and removing it . The switch may now be manually operated with the removable handle .

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6.2 Stroke length adjustment of linear actuator

If stroke length adjustment is needed due to over/under travel of the linear actuator, follow these steps:

1 . Remove special pin the connects the linear actuator to the spe-cial operator .

2 . Rotate the shaft clockwise to shorten the stroke length OR rotate the shaft counterclockwise to proper stroke length .

3 . Reconnect the linear actuator to the switch operator .

4 . Verify functionality and readjust stroke length if needed .

Figure 12. Special Pin and Screw at the Top of the Motor Actuator Piston.

Figure 13. Bottom Support Pin.

Section 7: Bolt tightness for connections to terminal padsUse the torque values given in Table 9 for tightening conductors to the switch terminal pads and tightening break jaws and hinge sta-tionary parts to the insulators .

Table 9. Hardware Tightness Values.

Bolt Diameter Decimal Size

in. (mm)Bolt Diameter

Standard

Nominal Torque

ft-lb (N•m)

0.250 (6.35) 1/4-20 5 (6.78)

0.312 (7.93) 5/16-18 12 (16.27)

0.375 (9.53) 3/8-16 25 (33.90)

0.500 (12.70) 1/2-13 50 (67.80)

0.625 915.88) 5/8-11 95 (128.82)

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Section 8: Electromechanical stored energy release (shunt trip)8.1 Description

The stored energy release feature of the MVS2/MVS2-c load inter-rupter switch allows the operator to manually compress the main operating spring, storing the spring energy to “Open” or “Close” the switch upon lifting the trigger latch . When the latch is released, the stored energy in the main operating spring is released to rotate the main shaft to close or to open the switch (see Figure 14) .

Table 10. MVS2/MVS2-c Switch Electromechanical Stored Energy Release Coil Data. Tolerance: ±15% Vac or Vdc.

Nominal Voltage E/R Amperes

120 Vac 11.2

240 Vac 7.4

50 Vdc 7.4

125 Vdc 5.0

250 Vdc 2.5

240 Vac Capacitor Trip 2.5

Figure 14. Stored Energy Mechanism.

8.2 Operation

WARNINGDEVIATING FROM THE WARNING LABEL ON SWITCHGEAR WILL RESULT IN EQUIPMENT DAMAGE AND MAY ALSO EXPOSE A PERSON TO BODILY INJURY OR DEATH. EXACTLY FOLLOW THE OPERATING INSTRUCTIONS ON THE LABEL.

CAUTIONCHANGING THE SWITCH POSITION WITH THE SWITCH OPERATING HANDLE WILL RESULT IN DAMAGE TO THE SWITCH. IF THE SWITCH STATUS NAMEPLATE INDICATES THE SPRING IS CHARGED, THE TRIGGER LATCH MUST BE RELEASED TO CHANGE THE POSITION OF THE SWITCH.

8.2.1 Charging the spring to “Close” or “Open” the switch

To initiate the opening or closing action, the handle is inserted into the handle casting and is rotated upward for the closing action or downward for the opening action through an angle of 120 degrees . The switch main operating spring is now charged and the trigger latch ready to be released to “Open” or “Close” the switch .

8.2.2 Closing the switch

Starting condition: The switch is “Open” and the spring has been charged by the action described in Section 8 .2 .1 (see Figure 16) .

When the trigger latch is lifted upward, either manually or by the action of the trigger coil, the blocking mechanism is released permitting the switch to “Close” . The final result is a “Closed” switch with the operating spring in an uncharged condition (see Figure 17) .

8.2.3 Opening the switch

Starting condition: The switch is “Closed” and spring has been charged by action in Section 8 .2 .1 (see Figure 18) .

When the trigger latch is lifted upward, either manually or by the action of the trigger coil, the blocking mechanism is released permit-ting the switch to “Open” . The final result is an “Open” switch with the operating spring in an uncharged condition (see Figure 15) .

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Figure 15. Switch Open, Spring Not Charged.

Figure 16. Switch Open, Spring Charged.

SPRING

SPRING ROD

MAIN LEVER(PINED TO MAIN SHAFT)

MAINSHAFT

STOP FORMAIN LEVER

SPRING RODPIN

TRIP LINK

TEETER ASSEMBLY

TRIGGERLATCH

HAND TRIPLEVER

ELECTRICALTRIGGER COIL

SPRINGLEVER

SPRING

SPRING ROD

SPRING RODPIN SPRING LEVER

MAIN SHAFT

MAIN LEVER

TRIP LINK

TEETER ASSEMBLY

STOP FOR MAIN LEVER

HAND TRIPLEVER

TRIGGERLATCH

ELECTRICAL TRIGGER COIL Figure 17. Switch Closed, Spring Not Charged.

Figure 18. Switch Closed, Spring Charged.

SPRINGSPRING ROD

SPRING ROD PIN

SPRINGLEVER

STOP FORMAIN LEVER

MAIN LEVER

TRIP LINK

TEETER ASSEMBLY

ELECTRICAL TRIGGER COIL

HAND TRIPLEVER

TRIGGERLATCH

MAINSHAFT

ELECTRICAL TRIGGER COIL

TEETER ASSEMBLY

HAND TRIPLEVER

TRIGGERLATCH

SPRING

SPRING ROD

SPRING RODPIN

SPRING LEVER

MAINSHAFT

MAIN LEVER

TRIP LINK

STOP FORMAIN LEVER

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8.3 Main shaft position with door interlock (shaft blocking cam)

WARNINGDEFEATING THE SHAFT BLOCKING CAM-DOOR INTERLOCK WHEN THE SWITCH IS ENERGIZED MAY RESULT IN SEVERE INJURY OR DEATH. DE-ENERGIZE THE SWITCH AND GROUND ALL LIVE PARTS BEFORE DEFEATING THIS INTERLOCK TO PERFORM MAINTENANCE, ADJUSTMENT, AND INSPECTION PROCEDURES.

When the enclosure door is opened, a spring-based cam assembly located at the opposite end of the operating shaft from main spring moves into position to block inadvertent switch closing .

The shaft rotation is prevented by the blocking action between the blocking cam on the shaft and the ramping cam of the spring-based assembly . If the door is open and a trip-to-close action is initiated, a jamming action takes place between the blocking cam and the ramping cam to stop shaft rotation; thus, the switch cannot close (see Figure 19) .

Figure 19. Operating Mechanism Showing Door Interlock, Shaft Blocking Cam, and Ramping Cam.

The blocking action must be released by inserting the operating handle into the maintenance hub and slightly rotating to reset the charged main spring again over toggle .

8.4 Inspection and maintenance

WARNINGFAILURE TO DISCONNECT AND TO GROUND ALL SOURCES BEFORE PER-FORMING ANY INSPECTION AND MAINTENANCE PROCEDURES MAY RESULT IN SEVERE INJURY OR DEATH. DISCONNECT AND GROUND ALL SOURCES BEFORE COMMENCING PROCEDURES.

WARNINGFAILURE TO REPLACE SHAFT BLOCKING ASSEMBLY BEFORE RETURNING SWITCH TO SERVICE MAY RESULT IN SEVERE INJURY OR DEATH. REPLACE THE SHAFT BLOCKING ASSEMBLY BEFORE ENERGIZING.

8.4.1 Blade and arc chute alignment

The blade and arc chute alignment procedures are the same as for the standard switch described in Section 4 . However, before the maintenance hub may be used, the following steps must be taken .

Step 1: Remove the door interlock-shaft blocking cam assembly by removing its two 0 .375 inch bolts .

Step 2: “Close” the switch and leave the spring in its discharged position . The maintenance hub may now be used for align-ment procedures, provided the trigger latch is raised dur-ing initial rotation of the operating shaft . Failure to release the trigger latch will damage components in the linkage assembly .

8.4.2 Spring release mechanism

The mechanism should:• Be latched prior to charging the operating spring• Stay latched when the main spring is charged• Release the linkage and the charged operating spring to “Close”

or “Open” the switch (depending on the position the switch is to change to)

• Latch after the switch has “Closed” or “Opened”

If the spring release mechanism is not latching and releasing correctly, make sure the spring is either discharged or the spring rod restrained .

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Notes:

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Notes:

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© 2018 EatonAll Rights ReservedPrinted in USAPublication No. IB02102002E / TBG000600April 2018

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