background image

 

 

CRANKS 

The two switch poles that are not connected to 

the offset bearing normally use a single crank, 

similar to Fig. 15. The switch pole that is 

connected to the offset bearing (drive phase) 

uses either a solid double crank, or a two piece 

adjustable crank, as shown in Fig. 5. The offset 

bearing used a two piece adjustable radius crank 

plus a separate stop crank with multiple 

mounting holes for angular adjustment. Figs. 16 

and 17. 

 

 

INSTRUCTIONS FOR SPECIAL SWITCHES 

 

For switches specifically designed to operate 

under abnormal ice conditions, it is important 

that they be adjusted to assure the switch blade 

(on a closing operation) exerts force on the jaw 

stop. 

 

FORCE VALUES 

 

Switch Voltage  

Force on Stop 

 

8.25 thru 169 kV 

 

80 lbs. 

 

242 thru 840kV  

 

40 lbs. 

 

 

 

The blade force adjustment should be made after 

the switch instillation is complete, as described 

previously in this instruction manual, except for 

the corona rings. 

The blade force adjustment is made as follows: 

Start with the three-pole switch in a position so 

that the blade end contacts are at least 1 foot 

from the stationary contact fingers. Using the 

manual operator, and observing one switch pole, 

lower the blade into the finger contact assembly 

and continue to close the switch to the point 

where it rests on the stop and there is 

approximately 1/8” clearance between the blade 

end contact and the stationary contact fingers on 

each side, see Fig. 19. This is the point at which 

the blade force is to be measured. It is important 

that the 1/8” clearance is obtained as the switch 

is being operated toward the closed position as 

described and never as the switch is being 

opened. This would cause an improper 

adjustment. 

Using a force gauge, measure the force exerted 

by the blade on the jaw stop by either pushing 

the blade up from below and noting the lbs. at 

which the blade is lifted off the jaw stop, or by 

putting a wire loop around the blade and lifting 

it with the gauge and noting the lbs. required. 

The place on the blade at which the force is 

measured should be just outside the finger 

contact assembly, see Fig. 18. If the force 

required is not proper, an adjustment must be 

made at the hinge end of the switch. To make 

the necessary adjustment, move the switch blade 

to a convenient point near the full open position 

and remove crank pin (B), Fig. 18, then move 

and twist blade or forked link (D) to disengage 

clevis (C) from crank. 

If the force measured was too high, turn the 

clevis (C), 1/2 turn into the forked link (D). But 

if the force measured was too low, turn the 

clevis (C) 1/2 turn out of the forked link and re-

connect the clevis. Check the threads on the 

clevis, some switches have right hand threads 

and others have left hand threads. Close the 

switch to the point previously described and 

again measure properly, another adjustment 

must be made. Repeat the procedure previously 

described. After one switch pole is satisfactorily 

adjusted, the other two poles should then be 

adjusted in the same manner.    

 

 

 

 

Table 1 

Lubrication Guide for Outdoor Switch Components 

Part Name 

Type Lubricants 

Recommended 

Amount 

Applied 

Qty. Req’d. for 

(6) Three-pole 

Switches 

Jaw Fingers 

NO-OX-ID Grade “A” 

Special or Mobil 28 

Grease 

Medium 

Coat 

 

Blade Ends 

NO-OX-ID Grade “A” 

Special or Mobil 28 

Grease 

Medium 

Coat 

(1) Quart 

Pins On current 

carrying parts  Mobil 28 Grease or DC-4 

 

Pins  On control 

parts 

Mobil 28 Grease or DC-4  Light Coat 

(1) Quart 

Bearing Areas 

On control parts  Mobil 28 Grease or DC-4 

Medium 

Coat 

 

Terminal 

Connections 

NO-OX-ID Grade “A” 

Special or NO 2 EJC 

Heavy 

Coat 

(1) Quart 

13 | 

P a g e

 

 

Summary of Contents for TTR6

Page 1: ...IB TTR6 B May 2012 ...

Page 2: ...t Crank Rod 7 Step 10 Install Vertical Operating Pipe 7 Step 11 Install Pipe Splice and Guide Plate 8 Step 12 Install Operating Mechanism 8 Step 13 Arcing Horn Installation 8 Step 14 Installation of Corona Rings and Balls 9 Step 15 Final Checks 9 Terminal Connections 9 Maintenance 10 Counterbalances 11 Bearings 12 Cranks 12 Special Switches 13 Renewal Parts 14 Suggested Tools 15 16 Open End Wrench...

Page 3: ...ngs If damage is found file a claim immediately with the transportation company and notify your Pascor Atlantic representative HANDLING Handling of disconnect switches should be done with care Porcelain is fragile and may be damaged due to improper handling Factory drawings should be followed during installation It is recommended that switches be fully assembled and adjusted at ground level before...

Page 4: ...shims place the shims under the insulator supports rotor bearing or spacer mounting flange where the bolts secure the rotor bearing or spacer mounting flange to the switch bases If optional leveling screws and or adjusting nuts have been supplied as shown in Fig 1 adjust the leveling screw and or adjusting nut to align the insulator stacks Loosen all hardware before jacking to prevent binding Step...

Page 5: ...ade into alignment and tighten hinge assembly mounting bolts Should this fail to give proper blade entry the jaw insulator stack should be shimmed or adjusted to suit When central entry is achieved rotate the blade into contact and tighten jaw base mounting bolts Also make certain the jaw fingers are nearly centered on the blade end contact If it is expected that the conductors to be attached to t...

Page 6: ...5 P a g e ...

Page 7: ...t is not usually possible to get this dimension to be equal on all three poles of a three pole switch If it s necessary to adjust this dimension remove connecting pin A and turn clevis B in or out turn then reconnect and try switch Turning the clevis in will move the blade away from the blade stop Conversely turning the clevis out will move the blade closer to the blade stop Open Blade Stop On swi...

Page 8: ...ed position In some adjustments the multi angle crank may be in such a position as to interfere with the stop projection on the switch crank If this is the case then remove this projection The other two poles will regulate the blade travel on this unit Note The multi angle crank should be set so that it forms an angle of approximately 45 degrees with the offset link in either switch position open ...

Page 9: ...ght torsional wind up in the operating pipe Tighten the two piercing set screws on the handle clamp until holes are punched into the pipe and continue until the screws are firmly seated Worm Gear Mechanism With ground strap in place on vertical operating pipe slide worm gear mechanism Fig 8 over the vertical operating pipe and attach it to the structure Remove the small position indicators which a...

Page 10: ...ase crank orientation per step 4 Terminal Connections The aluminum surface of the terminal connection provides for easy current transfer Notice In cases where a copper conductor is used bolt a tinned terminal clamp if available to the aluminum switch terminal pad If a non tinned terminal clamp is used apply a liberal amount of electrical joint grease at the joint and all over the pad of the fittin...

Page 11: ...n and that the contacts be examined to see that they are aligned clean and have a firm uniform pressure If the contacts are pitted or burned to some extent they should be removed and replaced Under normal service conditions the jaw contacts should be examined and maintained at least once a year depending upon the type of atmosphere to which they are exposed Periodic maintenance should consist of c...

Page 12: ...the mounting positions as required for each installation If it is necessary to change the mounting position of the switch in the field the counterbalance must be changed as described below UPRIGHT TO VERTICAL WARNING When performing this procedure use care because parts are in tension 1 Open the switch blade to approximately the 75 degree position 2 Clamp the plunger of the counterbalance with vis...

Page 13: ...the pin may be a bit difficult to remove 5 Remove pin B at the rear of the counterbalance The unit is now free to invert so that drain holes will be located as shown for inverted mounting 6 Re connect the rear of the counterbalance with Pin B 7 Remove the jaw assembly from its support insulator 8 Lower the blade below the CLOSED position and connect the counterbalance 9 plunger to the proper point...

Page 14: ...adjustment Using a force gauge measure the force exerted by the blade on the jaw stop by either pushing the blade up from below and noting the lbs at which the blade is lifted off the jaw stop or by putting a wire loop around the blade and lifting it with the gauge and noting the lbs required The place on the blade at which the force is measured should be just outside the finger contact assembly s...

Page 15: ...ch pole The same data is shown on the record engineering drawings The master file at the factory is linked to the serial number on the nameplate Renewal Parts Ordering Information Serial Number Switch Type Part Name Quantity Required Max kV B I L kV Cont Amps Mom Amps Refer your requests for renewal parts to the Factory 14 P a g e ...

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