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IB-TTT7

May 2012

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Summary of Contents for TTT7

Page 1: ...IB TTT7 May 2012 ...

Page 2: ...ase and Operating Connecting Rods 4 Step 8 Installing Vertical Operating Pipe 4 Step 9 Installing Vertical Operating Pipe and Operation Mechanism 5 Step 10 Arcing Horns or Arc Restrictors 7 Step 11 Installation of Sleet Corona Shields 7 Step 12 Final Checks 7 Maintenance 7 Terminal Connections 7 Renewal Parts 9 Suggested Tools 15 16 Open End Wrench 15 16 Socket 3 4 Open End Wrench 2 3 4 Socket 1 1...

Page 3: ...ic 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 being placed into position This should minimize final adjustments Lifting of switches by insulators contacts...

Page 4: ...essary to adjust the insulator columns for variation in heights or proper angle use the shims leveling bolts or leveling screws as provided see Fig 1 Step 5 Mounting Current Carrying Parts Rotate the center insulator column to the open position as shown on the drawings The stop at the bottom of the column limits the travel At this time the crank at the bottom of the insulator column will be at an ...

Page 5: ... three pole switch In fact after all three poles have been adjusted in the open position and then closed you may find that one pole will be high on the right one fairly level and one high on the left This is due to many variables and tolerances plus the free play or clearance in pin connections of all the switches and control parts 6 3 Blade Engagement When Switch is Closed Due to varying friction...

Page 6: ...ide plate which can be easily adjusted in an arc to provide the required rotation These act as locks for the manual operating handle when it is dropped from the operating position The handle must be raised to a horizontal position for operation With the switch in the fully closed position set the handle clamp so its set screws are 4 inches above the lock plate and its vertical centerline is at or ...

Page 7: ...6 P a g e ...

Page 8: ...blades should make central entry into their jaws at approximately the same time 3 In the closed position all blades must be in full contact with jaw contacts and also vertical within the tolerances described previously The stop at each switch base and the stop for the operating bearing should be touching or nearly so The indicator to the worm gear operating mechanism should indicate the switch is ...

Page 9: ...ntact surfaces of conductors and fittings using a stiff wire brush to remove heavy oxide coatings until the aluminum finish is visible and restored 2 Prepare any bare copper surfaces in the usual manner 3 Coat these now clean contact areas with a liberal amount of corrosion inhibitor such as NO OX ID A Special or no 2 EJC 4 Abrade the contact surface through the corrosion inhibitor using a stiff w...

Page 10: ...each switch 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 ...

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