Instructions for installation, operation, and maintenance of type MVS/MVS-c load interrupter switches 4.76 kv, 15 kv, 27 kv, and 38 kv

Transcription

1 Contents Description Page Introduction Receiving, handling, and storage... 6 Installation Inspection before initial energizing of an MVS/ MVS-c switch... 7 Operation Maintenance Low voltage control device and wiring Motor operation Electromechanical stored energy release (shunt trip) Bolt tightness for bus connections to terminal pads

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3 Instruction Booklet IB E Disclaimer of warranties and limitation of liability This 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. 3

4 Read and understand these instructions before attempting installation, operation, or maintenance of this equipment. This equipment must be installed and serviced only by qualified electrical personnel. Retain this document for future use. HAZARD 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. HAZARDS 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 PRO- TECTIVE 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. DANGER ALL APPLICABLE SAFETY CODES, SAFETY STANDARDS, AND SAFETY REGULATIONS MUST BE ADHERED TO WHEN INSTALLING, OPERATING, OR MAINTAINING THIS EQUIPMENT. Section 1: Introduction 1.1 Purpose This instruction booklet is expressly intended to cover the installation, operation, and maintenance of medium voltage switch (MVS/MVS-c) load interrupter switches. It is not encompassing of all possible contingencies, variations, and details that may arise during operation or maintenance of this equipment. 1.2 Application and description A Type MVS/MVS-c load interrupter switch consists of an air insulated, three-pole, gang-operated, quick-make, quick-break, load interrupter switch. The MVS/MVS-c switch must be installed in a suitable enclosure before operation, and can be applied in combination with power fuses or other protective devices to provide safe, low-cost, infrequent switching, and circuit protection. FAILURE TO INSTALL A TYPE MVS/MVS-C SWITCH IN A SUITABLE ENCLO- SURE WITH PROPER INTERLOCKING MAY RESULT IN PROPERTY DAMAGE, SEVERE INJURY, OR DEATH. AN MVS/MVS-C SWITCH MUST BE INSTALLED IN A SUITABLE ENCLOSURE BEFORE BEING USED TO SWITCH AND CON- TROL HIGH VOLTAGE POWER CIRCUITS. 1.3 Documentation references For further information on installation and application, refer to the applicable descriptive bulletins and/or industry standards publications. Download Eaton electronic information from Eaton contact information For additional information about Eaton products please call or log onto Additional Medium Voltage Switchgear information regarding Pricing/Aftermarket, Customer Service, Engineering/Technical information, or Warranty, can be found by calling Eaton Electrical Services and Systems (EESS) can be reached at If further information is desired regarding this particular installation or application information, contact the local Eaton sales office, reference Eaton s Consulting Application Guide, or the appropriate industry standards. 4

5 Instruction Booklet IB E 1.6 Safety precautions CAUTION ONLY QUALIFIED ELECTRICAL WORKERS WITH TRAINING AND EXPERI- ENCE ON HIGH VOLTAGE CIRCUITS SHOULD BE PERMITTED TO WORK ON THIS EQUIPMENT. THEY SHOULD BE FAMILIAR WITH THE WORK TO BE PERFORMED, THE SAFETY EQUIPMENT REQUIRED, AND HAZARDS INVOLVED. Figure 1. Drawing of a Typical Type MVS/MVS-c Load Interrupter Switch. DANGER EXCEEDING THE NAMEPLATE RATINGS OF AN MVS/MVS-C SWITCH MAY CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH. DO NOT APPLY AN MVS/MVS-C SWITCH BEYOND ITS NAMEPLATE RATINGS. 1.5 Safety features The type MVS/MVS-c load interrupter switch is manufactured with several built-in interlock provisions and safety features to reduce hazards and to provide proper operating sequences. 1. A mechanical interlock provision prevents opening the front enclosure door when the switch is in the Closed position when the mating interlocking part is on the enclosure door. A key interlock system may be used in lieu of this device to perform the same function. 2. A switch interlock prevents inadvertent closing of the switch when the front enclosure door is open when the mating interlocking part is on the enclosure door. A key interlock system may be used in lieu of this device to perform the same function. 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 enclosure manufacturer or customer addition of key interlocks to force a sequence of operation such as that in 1 and 2 above, or other unique systems. 1. Read and understand these instructions before attempting any assembly, operation, or maintenance of an MVS/MVS-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 standards. 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. DEFEATING OR DISENGAGING SAFETY INTERLOCKS ON AN MVS/MVS-C SWITCH THAT IS PROPERLY INSTALLED IN AN APPROPRIATE ENCLOSURE 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 MVS/MVS-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 drawings. 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-E and industry standard ACI 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 MVS/ MVS-c switch into operation. See Section 10, Table 5 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 vertical section. 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 C Section 6.2. Refer to Table 1 in C for appropriate voltage and insulation levels. 5

6 1.5 Switch identification A rating nameplate is located on the mechanism cover of each type MVS/MVS-c switch. Contained on this nameplate are the switch catalog number or style number, and all the switch ratings required by industry standards. This information should be given to the Eaton sales office if a question should arise concerning the switch or if renewal parts are required. Section 2: Receiving, handling, and storage 2.0 Receiving When receiving an MVS/MVS-c switch, a visual inspection should be performed immediately upon receipt of the switch and before removing it from the truck. Shipping papers should be checked to be sure that all boxes or other accompanying pieces have been received. If any damage or shortages are evident, a claim should be filed at once with the carrier and the nearest Eaton sales office should be notified. The rating nameplate for each MVS/MVS-c switch assembly is located on the switch s mechanism cover. The information on this nameplate and the applicable Eaton general order number should be given to the Eaton representative whenever identification of the switch assembly is required. 2.1 Handling An MVS/MVS-c switch is insulated for high voltages and it must be protected at all times against damage during handling. Switch and/ or fuse mountings will be packed separately in an individual carton or crate. These packages must be handled with care to avoid damage to the equipment inside. 2.2 Storage If it is necessary to store an MVS/MVS-c switch before installation, keep it in a clean, dry location with ample air circulation and heat to prevent condensation. Like all electrical apparatus, an MVS/MVS-c switch contains insulation that must be protected against dirt and moisture. Figure 2. Typical Nameplate. 6

7 Section 3: Installation 3.1 Switch mounting, MVS/MVS-c switch Standard MVS/MVS-c switch mounting dimensions and details can be found on Eaton s Web site, Match the MVS/ MVS-c switch ratings to the appropriate drawing that will permit design and fabrication of the enclosure. 3.2 Fuse mountings Standard MVS/MVS-c fuse mountings and live parts may be found on Eaton s Web site, Match the MVS/MVS-c fuse mounting type to the appropriate drawing that will permit design and fabrication of the enclosure. 3.3 Enclosure requirements, MVS/MVS-c switch An enclosure must incorporate the following items on the door to provide for standard National Electrical Manufacturers Association (NEMAT), American National Standards Institute/Institute of Electrical and Electronic Engineers (ANSI/IEEET), and Canadian Standards Association (CSAT) safety requirements. 1. A viewing window for an operator to verify that all three switch blades are open when the switch is opened prior to opening the enclosure door. 2. A door/switch shaft interlocking bracket or a key interlocking system to perform the same function. 3. Door/switch mechanism interlock assembly bracket or a key interlocking system to perform the same function. Key interlocks may also be added for other key systems. The necessary construction details of these features are included in Eaton Technical Certification Sheets (TCS) Control power (low voltage) connections, MVS/MVS-c switch Terminal blocks are supplied for motor operated and shunt trip switches. For an auxiliary switch, the wiring is to be connected to the switch s terminals. Drawings for these items can be found on Eaton s Web site, Instruction Booklet IB E Section 4: Inspection before initial energizing of an MVS/MVS-c switch CAUTION EACH SWITCH IS PROPERLY ADJUSTED AT THE FACTORY BEFORE SHIP- MENT. HOWEVER, VIBRATION AND MECHANICAL STRESSES IMPOSED BY TRANSIT AND INSTALLATION CAN ADVERSELY AFFECT SWITCH ADJUSTMENT. THEREFORE, A FINAL INSPECTION IS ESSENTIAL BEFORE ENERGIZING. IF THIS INSPECTION REVEALS THE SWITCH HAS COME OUT OF ADJUSTMENT, THE SWITCH SHOULD BE CORRECTED ACCORDING TO ALIGNMENT PROCEDURES IN SECTION 6.2. INSPECTION PROCEDURES REQUIRE CLOSING AND OPENING THE SWITCH WITH THE MAIN DOOR OPEN. THIS REQUIRES OVERRIDE OF THE SWITCH SAFETY INTERLOCK AS DESCRIBED IN SECTION AND MUST BE ACCOMPLISHED BEFORE ENERGIZING. 4.1 Inspection procedure Step 1: With switch in the Open position (see Figure 3), the distance between the edge of the main blade and the closest point of the break jaw should be: ± inch ( ± 3.18 mm) for 4.76 kv switches ± inch ( ± 3.18 mm) for 15 kv switches ± inch ( ± 3.18 mm) for 27 and 38 kv switches The tolerance for inverted switches should be: , inch ( , mm) for 4.76 kv switches , inch ( , mm) for 15 kv switches Step 2: The main and flicker blades must be in proper alignment with break jaws and arc chute openings respectively. This can be checked by closing the switch and then partially opening it using the maintenance hub (see Figure 5). Step 3: In the closed position, the drive rod links and shaft ears must be to inch (1.60 to 3.18 mm) over toggle when checked with a straight edge (see Figure 4). If the drive rod link is 1.75 inch (44.45 mm) wide, be aware a inch (3.18 mm) spacer must be placed on the shaft to obtain the correct over toggle indication. Step 4: With the switch closed, the upper spacers of the main blades should rest ± inches (4.78 ± 1.60 mm) above the bottom of the depression of the stationary break jaw (see Figure 10). Step 5: With the switch closed, each main blade assembly should engage the break jaw such that the back of the blades is between the dimensions in Figure 10. 7

8 Step 6: When MVS/MVS-c fuse mountings are supplied, check to ensure that the fuse mountings are securely fastened and that the fuses are securely clamped in place. Ensure all threaded fasteners are tightened to the appropriate value (see torque specifications in Section 10, Table 5). Step 7: When Eaton Type RBA fuses are provided, check to ensure that the discharge filters or condensers on the fuses have been securely hand tightened. Step 8: Wipe away any dust or dirt that may have accumulated in compartment(s), paying particular attention to insulators and insulating material. Open Gap Distance Step 9: A final, thorough inspection should be made to ensure that no tools or other objects are accidentally left inside the enclosure. Open Gap Distance Figure 5. Pipe-like Maintenance Hub Welded to the Switch Shaft. Figure 3. Main Blade Open Gap Measurement Inch Straight Edge Drive Rod Figure 4. Drive Rod Links and Shaft Ears Over Toggle Verification. 8

9 Section 5: Operation 5.1 Mechanical safety interlocks OPERATION OF AN MVS/MVS-C SWITCH NOT INSTALLED IN A SUITABLE ENCLOSURE WITH PROPER INTERLOCKING MAY RESULT IN PROPERTY DAMAGE, SEVERE INJURY, OR DEATH. AN MVS/MVS-C SWITCH MUST BE INSTALLED IN A SUITABLE ENCLOSURE BEFORE BEING USED TO SWITCH AND CONTROL HIGH VOLTAGE POWER CIRCUITS. DEFEATING OR DISENGAGING SAFETY INTERLOCKS ON AN MVS/MVS-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 MVS/MVS-c switch in an enclosure should be equipped with switch interlocks and door interlocks as described in Section 3.3. A manually operated MVS/MVS-c switch also comes with provisions for padlocking it in either the Open or Closed position. 5.2 Switch operation Instruction Booklet IB E CAUTION OPERATING AN MVS/MVS-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 MVS/MVS-C SWITCH. To manually close or open a manually operated MVS/MVS-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 blowout forces that occur if the switch is closed into a fault. However, these forces are not transmitted to the operating handle because it is not rigidly connected to the blades. Therefore, the switch can be safely closed under short-circuit conditions within its fault-close rating. Load interruption is accomplished by flicker blades and contact fingers located inside a DE-IONT 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 7 for the sequence of operation. Figure 6. Typical Door/Switch Mechanism Interlock and Shaft Interlock Locations Door/switch mechanism interlock This mechanical interlock prevents inadvertent closure of the switch if the enclosure door is open. When the door is closed, a pointed latch lug fastened to the inside of the enclosure door causes the interlock latch to move out of the blocking position (see Figure 6). For motor operated switches, see Section 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 hook welded to the operating shaft engages a bracket fastened to the inside of the switch enclosure door, thus preventing the door from being opened (see Figure 6). Left Hand Pole: Flicker and Main Blades Engaged. Center Pole: Main Blade Disengaged, Flicker Blade Engaged. Right Hand Pole: Flicker and Main Blades Disengaged. Figure 7. Flicker Blade Operation Key interlocking, MVS/MVS-c switch Key interlock provisions for one or two key, Kirk brand type F lock (or other manufacturers equal), with 1.00 inch (25.4 mm) bolt projection are standard on a manually operated MVS/MVS-c switch. Mounting locations and associated functions of these key interlocks are shown on Eaton Technical Certification Sheets (TCS)

10 Section 6: Maintenance 6.1 Inspection schedule An MVS/MVS-c switch should be thoroughly inspected prior to initial energizing. Every year thereafter a routine inspection to clean, to lubricate, and to check for signs of wear and tear, damage, and so on, is recommended as described in Section 6.2. If any problems are discovered, they should be corrected by following procedures in Sections 6.3 and 6.4. After the number of rated interruptions at the rated current in Industry Standard ANSI C37.22 or after the switch has been exposed to fault currents, 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 4 should be performed. 6.2 Inspection procedure FAILURE TO COMPLETELY DISCONNECT THE SWITCH FROM ALL POWER SOURCES PRIOR TO INSPECTION MAY RESULT IN SEVERE INJURY OR DEATH. AN MVS/MVS-C SWITCH MUST BE COMPLETELY DISCONNECTED FROM ALL POWER SOURCES BEFORE PERFORMING INSPECTION 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 Step 2: If flicker blades are pitted from arc erosion, they may be smoothed with a few light strokes of a fine file. NNote: 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. 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 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. CAUTION SLOW 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 CLOSING OR SLOW OPENING OPERATIONS Flicker blade engagement check Step 1: Close the switch. Step 2: Insert the removable handle in the pipe-like maintenance hub welded to the switch shaft (see Figure 5) and slowly Open the switch. The flicker blades should remain engaged in the contact fingers while the main blades open. Step 3: When the main blades clear the break jaws, they will hit a stop on the flicker blade brackets and start the flicker blades out of their contact fingers. The flicker blades will then snap open from the forces in their charged torsion springs Interphase barrier inspection Step 1: Check the interphase barriers for carbon or metallic deposits. Replace if deposits are present Electrical parts and insulation check 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. CAUTION ISOPROPYL ALCOHOL IS FLAMMABLE. PROVIDE ADEQUATE VENTILA- TION 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 readings for future reference in determining when trends occur that would indicate a lowering of the insulation resistance. NNote: 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 Table 1. Table 1. Field Dielectric Test Values. kv Class Test Voltage, 60 Hz AC Applied for 1 Minute 10

11 6.2.6 Mechanical operation check Close and open the de-energized switch at least three times to check the performance of the operating mechanism. 6.3 Alignment procedures Check each of the following items for adjustment and/or alignment. If out of adjustment and/or alignment, follow the instructions given. Instruction Booklet IB E Step 2: Check to see that the blades are fully closing. To do this, first push the blade onto the break jaw until all of the slack is removed between the blade and the drive rod link. Then measure the distance from the front of the top of the break jaw to the outer edge of the main blade. This dimension should be between to inch (3.18 to 7.14 mm) (see Figure 9). FAILURE 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 Override of door/switch mechanism interlock To operate the switch with the door open, the interlock (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 9. Closed-Open-Stop Adjustment Bolts. Step 3: Should adjustment be required, loosen the bolt holding the drive rod to the shaft and adjust the blade travel. Re-tighten the bolt to 23 ft-lb (31.18 N m). Open and close the switch twice, then recheck the dimension as described above. Figure 8. Override of the Switch Interlock Safety Latch Closed-open-stop adjustment Step 1: Remove the switch mechanism cover (see Figure 7) by removing the bolts. Viewing the switch mechanism from the top, the bottom stop bolt and nut adjusts the closed position (see Figure 9). In the closed position, the shaft rod ends should be slightly over toggle. This can be easily checked by laying a straight edge on top of the drive rod so that its end extends over the shaft (see Figure 4). If a to inch (1.60 to 3.18 mm) gap appears between straight edge and drive rod, adjustment is correct. Figure 10. Important Clearances. 11

12 Step 4: In the open position, clearance between the edge of the main blade and the break jaw should be as tabulated in Section 4.1, Step 1 (see Figure 3). The top stop bolt adjusts this dimension (see Figure 9). Step 5: If the switch is equipped with key interlocking, care must be taken when replacing the switch mechanism cover to ensure that it is properly repositioned. Elongated holes allow for vertical adjustment. The key interlock bolt must clear the Open-Closed indicating cam handle casting when retracted Main blade alignment (Figure 11) Refer to Figure 11 when performing this procedure Vertical position of break jaw Refer to Figure 10 and Figure 11 when performing this procedure. Step 1: Close the switch. Step 2: Check that the upper spacers of the main blades are between and inches (3.18 and 5.56 mm) above the tops of the break jaws. If they are not, loosen the bolts holding the break jaw. Adjust as necessary. Step 3: When setting is correct, tighten bolts to 25 ft-lb (33.90 N m) Break jaw bolt and hinge contact bolt tightness The disk springs on the main blade assembly must provide the necessary contact pressure between the main blades and stationary mating parts when the switch is closed (see Figure 11). Step 1: Remove the jam nut at the end of the break jaw. Step 2: Use a sensitive torque wrench to set the proper contact pressure found in Table 2. Table 2. Proper Contact Pressure Fault-Close Rating ka Asymmetrical (2.26) (2.83) Torque in lbs (N m) Figure 11. Blade Assembly and Break Jaw Alignment. Step 1: Loosen the four hinge bolts (shown in the bottom of the drawing) and the two break jaw bolts (shown in the top of the drawing). Step 2: Insert the removable handle in the maintenance hub on the shaft and Close the switch. NNote: For safety purposes, the switch will not fully Close and will revert to the Open position if pressure on the handle is released. Step 3: Hold the switch in the Closed position with the handle and tighten the bolts on both the hinge and jaw to 25 ft-lb (33.90 N m). Hold handle firmly throughout alignment process Arc chute alignment Refer to Figure 11 when performing this procedure. Step 1: Loosen the two arc chute mounting bolts (shown in the top of the drawing). Step 2: Adjust the arc chute so that its opening is parallel to the main blade. Tighten the mounting bolts enough to prevent movement. Step 3: For the hinge end, there are two configurations: If there is only an jam nut installed, tighten it to 25 ft-lb (33.90 N m), and then back off the nut one full turn. If there is an jam nut that jambs a standard hex nut, remove the jam nut, tighten the standard hex nut to 20 ft-lb (27.12 N m), then back off one full turn. Reinstall the locking nut and jamb it against the standard hex nut, being careful not to turn either the bolt or the standard nut. Standard ohm readings between the top terminal pad and the bottom terminal pad on each pole are not to exceed 60 micro ohms. 6.4 Replacement procedures FAILURE 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 BEFORE PERFORMING INSPECTION Main blade and hinge 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 Method A For the following procedure, refer to Figure 12. Step 3: Using the maintenance hub, located on the switch shaft (see Figure 6), slowly close the switch and check that the flicker blade is in line with the arc chute opening. If necessary, move the arc chute left or right until it lines up with the flicker blade. Step 4: Completely tighten the arc chute mounting bolts and recheck the alignment. 12

13 Instruction Booklet IB E 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 Completing method A or B Step 6: Align flicker blade and arc chute per Paragraph Step 7: Check flicker blade function per Paragraph If satisfactory, connect the drive rod to main blade. Step 8: Check the switch for adjustments per Paragraph and Paragraph Step 9: Perform the pre-operation check detailed in Section Spring replacement The main spring is a large compression spring along the inside of the switch frame on the operating handle side (see Figure 13). 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. Hinge Bolt Figure 12. Main and Flicker Blade Replacement. Notice the Hinge Bolt Is Pulled Out to Indicate the Method of Replacement. Step 1: Remove the bolt and jam nut holding the switch blades to the stationary hinge parts. The main blade and flicker blade assembly are now disengaged and may be removed. The terminal pad will remain in place. Step 2: Remove the two bolts holding the break jaw to the upper terminal. The jaw is now disengaged. Step 3: Replace the jaw, but only finger tighten its two mounting bolts at this time. Step 4: Remove the contact pressure bolt on the hinge end of the blade assembly, then separate the blade assembly from the stationary hinge parts. Step 5: Replace the main blade assembly on the stationary hinge parts and tighten the jam nut to 20 ft-lbs (27.12 N m) on the hinge end of the blade, then back off one full turn Method B For the following procedure, refer to Figure 12. Step 1: Remove components fastened to the hinge end terminal pad and retain for later re-installation. Step 2: Remove the four bolts 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 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. Figure 13. Main Spring Replacement Showing the Pipe Spacer Main spring replacement Step 1: To disengage the main spring, remove the switch mechanism cover (see Figure 6). Step 2: Take a 5/16 inch 18 threaded rod 4.00 inches (101.6 mm) long and screw it into the rear end of the spring rod. Step 3: Make a spacer 1.50 inches (38.1 mm) long from a pipe or tube with a 1.00 inch (25.4 mm) inside diameter. Put this spacer over the 5/16 inch rod and the main spring rod. Step 4: Take a washer with an outside diameter larger than the spacer and place it on the threaded rod. Step 5: Turn a 5/16 inch 18 nut onto the rod until it is hand-tight and then center the spacer. Step 6: Use an appropriate 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 inch 18 nut on the piece of all-thread rod to relieve the tension. 13

14 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 Auxiliary spring replacement Step 1: To remove the auxiliary spring, put switch in Closed position. While the compression spring is in its longest condition, remove the jam nut and bolt holding the spring retaining rod to the small arm of the main shaft. Step 2: Pull the spring rod away from its rear support. The spring is now disengaged of the rod. Step 3: To install the auxiliary spring, reverse this procedure with the switch in the Closed position Shaft or bearing replacement Step 1: To replace the shaft bearings, remove the switch from the enclosure and place it on a secure work surface. Step 2: Disengage the springs as instructed in Section Step 3: Unbolt and remove the drive rods from the switch s main shaft ears. Step 4: Remove the two bolts holding the bearing support on the left end of the shaft. Step 5: Remove hardware from the barrier support angle on one side, and do the same for any other left to right structural members. Step 6: Pull the side sheets carefully apart to release the main shaft from the bearings. The bearings can now be removed and replaced. Step 7: To install the shaft or bearings, follow this procedure in the reverse order Pre-use check After completing any maintenance, the alignment should be checked (see Section 6.2). After completing any alignment, the switch should be operated at least three Close-Open operations to check for proper performance Preferred lubrication method Step 1: Remove the shaft (see Section 6.4.3). 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 6.4.3) 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 hardened lubricant to allow the parts to rotate disengaged. Step 3: Once the parts are disengaged, add a few drops of synthetic lubricating oil and let it wick into the mating surfaces. Step 4: Wipe off any the excess oil. NNote: Using this alternative lubrication method will require more attention to periodic maintenance to ensure the mechanism works correctly. The mechanism should be re-oiled with synthetic lubricating oil at regular intervals, making sure any excess oil is wiped off. 6.5 Lubrication 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 contact grease (Eaton part number 7274A48H02) should be applied sparingly to contact surfaces on the break jaw and between blade and hinge. Mechanism grease (Eaton part number 53701AI02E) 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. 14

15 Section 7: Low voltage control devices and wiring 7.1 MVS/MVS-c switch Where low voltage electrical accessories such as motor operators, shunt trip operators, or auxiliary switches are provided on the switch, those accessories are to be wired as indicated on drawings that can be found on Eaton s Web site, Section 8: Motor operation 8.1 Motor operated MVS/MVS-c switch Instruction Booklet IB E The motor operated MVS/MVS-c switch is essentially a standard, manually operated switch with a motor driven linear actuator connected to the switch mechanism. Because all basic switch parts are identical to those of the standard manually operated switch, sections of this instruction booklet pertaining to installation, inspection before startup, maintenance, and parts replacement also apply to the motor operated switch. Table 3. MVS/MVS-c Switch Motor Operator Current Requirements. Nominal Voltage 120 Vac Vdc Vdc Vdc 1.5 E/R Amperes Time to Open or Close an MVS/MVS-c switch with an integral motor operator is about 5 seconds for the AC versions and about 10 seconds for the DC versions. 8.1 Receiving and startup For MVS/MVS-c switches, each switch assembly is shipped with the linear actuator installed. 8.2 Electrical operation Figure 14. A Typical Auxiliary Switch Shown Installed and Wired. The preferred voltage for the linear actuator to operate is 120 Vac. The control power is normally supplied by the customer. (See the job drawings for an electrical schematic diagram and wiring diagram of the motor operator circuitry to determine the actual operating voltage and power source.) 8.3 Safety interlocking With the MVS/MVS-c motor operated switch, safety interlocking is based upon a key interlock system. The switch mechanism key interlock must have an integral electrical switch. Extending the interlock bolt will mechanically lock the MVS/MVS-c switch in the Open position, will open the electrical control power circuit for the motor operator, and will release the key. With the key, a person can then unlock the key interlock on the switch enclosure door. This scheme prevents closing the switch with the door open as well as preventing opening of the enclosure door with the switch Closed. OPERATING AN MVS/MVS-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 MVS/MVS-C SWITCH. 8.4 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. 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. 15

16 8.5 Stroke length adjustment of linear actuator If stroke length adjustment is needed due to over/under travel of linear actuator, follow these steps. 1. Remove special pin that connects the linear actuator to the special 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. Section 9: Electromechanical stored energy release (shunt trip) 9.1 Description The stored energy release feature of the MVS/MVS-c load interrupter 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 17). Table 4. MVS/MVS-c Switch Electromechanical Stored Energy Release Coil Data. Tolerancee: ±15% Vac or Vdc. Nominal Voltage E/R Amperes 120 Vac Vac Vdc Vdc Vdc Vac Capacitor Trip 2.5 Figure 15. Special Pin and Screw at the Top of the Motor Actuator Piston. Figure 16. Bottom Support Pin. DEFEATING OR DISENGAGING SAFETY INTERLOCKS ON AN MVS/MVS-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. Figure 17. Stored Energy Mechanism. 8.6 Maintenance The linear actuator itself is completely weather-sealed. The linear actuator and its associated bearings are lubricated for their normal life many times in excess of the main switch and require no maintenance. 16

17 Instruction Booklet IB E 9.2 Operation DEVIATING 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. Trip Link Teeter Assembly Trigger Latch Electrical Trigger Coil Hand Trip Lever CAUTION CHANGING 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 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 Closing the switch Starting condition: The switch is Open and the spring has been charged by the action described in Section (see Figure 19). 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 20). Spring Spring Rod Main Lever (Pinned to Main Shaft) Figure 19. Switch Open, Spring Charged. Switch Open, Spring Charged Teeter Assembly Trigger Latch Spring Lever Spring Rod Pin Main Shaft Main Lever Stop Angle Assembly Electrical Trigger Coil Opening the switch Starting condition: The switch is Closed and spring has been charged by action in Section (see Figure 21). 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 Open. The final result is an Open switch with the operating spring in an uncharged condition (see Figure 18). Trip Link Hand Trip Lever Trigger Latch Electrical Trigger Coil Main Lever Stop Angle Assembly Spring Rod Teeter Assembly Trip Link Hand Trip Lever Main Shaft Spring Rod Spring Main Lever (Pinned to Main Shaft) Spring Lever Spring Rod Pin Spring Rod Pin Spring Lever Figure 20. Switch Closed, Spring Not Charged. Spring Main Lever Stop Angle Assembly Switch Closed, Spring not Charged Main Lever (Pinned to Main Shaft) Main Shaft Figure 18. Switch Open, Spring Not Charged. 17

18 Electrical Trigger Coil Trigger Latch Teeter Assembly Trip Link Hand Trip Lever Spring Rod Main Lever Stop Angle Assembly Main Shaft Spring Spring Rod Pin Spring Lever Main Lever (Pinned to Main Shaft) Figure 21. Switch Closed, Spring Charged. 9.3 Main shaft position with door interlock (shaft blocking cam) Switch Closed, Spring Charged DEFEATING 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 22). Figure 22. 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. 9.4 Inspection and maintenance FAILURE 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. FAILURE TO REPLACE SHAFT BLOCKING ASSEMBLY BEFORE RETURNING SWITCH TO SERVICE MAY RESULT IN SEVERE INJURY OR DEATH. REPLACE THE SHAFT BLOCKING ASSEMBLY BEFORE ENERGIZING. 18

19 9.4.1 Blade and arc chute alignment The blade and arc chute alignment procedures are the same as for the standard MVS/MVS-c switch described in Section 6. 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 inch bolts. Step 2: Close the switch and leave the spring in its discharged position. The maintenance hub may now be used for alignment procedures, provided the trigger latch is raised during initial rotation of the operating shaft. Failure to release the trigger latch will damage components in the linkage assembly Over toggle adjustment This adjustment is identical to that in Section 6. Instruction Booklet IB E Section 10: Bolt tightness for connections to terminal pads Use the following torque values for tightening hardware where conductors are connected to terminal pads. Table 5. Hardware Torque Values. Bolt Diameter Decimal Size Inches (mm) Bolt Diameter Standard (6.35) 1/ (5.42) (7.93) 5/ (10.85) Nominal Torque ft-lb (N m) (9.53) 3/ (33.90) (12.70) 1/ (67.80) ) 5/ (88.13) Open gap adjustment This adjustment is to be made the same as that in Section Spring release mechanism adjustment This mechanism is bolted to the side sheet with four bolts. It is adjusted by loosening these bolts, then sliding the mechanism up or down slightly as appropriate, tightening the bolts, then operating the switch to both the Open and Closed positions. 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 (see Section 5.4.2, Spring Replacement), then loosen the four mounting bolts and again sliding the mechanism up or down as necessary to obtain the proper action. Be sure to operate the switch Opened and Closed to ensure the mechanism is latching and releasing correctly. 19

20 Eaton Electrical Sector 1000 Eaton Boulevard Cleveland, OH United States 877-ETN-CARE ( ) Eaton.com 2016 Eaton All Rights Reserved Printed in USA Publication No. IB E / TBG May 2016 Eaton is a registered trademark. All other trademarks are property of their respective owners.