Turner Electric www.turnerswitch.com 618-797-5000
Turner Electric D Switch
Maintenance and Adjustment Procedures for Turner Phase Over Phase Switches:
Type 1AD, 1CD, 2D and 3D
Note: It is extremely important to have as much information about the history of the switch prior to undertaking any of the
following maintenance procedures. Contact the area operating personnel to for their personal input about any problems
they have encountered. In addition to this, it would be useful to run a pre-maintenance thermal on the switch to pinpoint any
potential problem areas. Proper repair parts should be on hand prior to undertaking the maintenance procedures in order to
minimize downtime. It is best to read the installation and adjustment instructions for a new switch prior to undertaking any
maintenance.
Section I: Determine Mechanical Operating Status of Switch
1. Open the switch manually. The effort to operate the switch should not be excessive. After opening, slowly rotate
the handle toward close and then toward open to determine if the pivot and/or outboard bearing assembly are
operating properly.
a. If it requires excessive force to open, skip points 2 and 3 and move onto the maintenance stage.
b. If the force is excessive…
i. From the beginning, the pivot or outboard bearing assembly could be seized
ii. Occasionally grabbing or catching, a pivot bearing is probably seizing
iii. After the TECO-rupter is engaged (if so equipped), either the gang operating pipes are not
correctly installed or the TECO-rupter is seizing
2. Move the switch toward the closed position slowly until the first blade touches one of the jaw contacts, keep
pressure on the operating handle and observe
a. If it is the top phase, with the middle slightly lagged behind it and the bottom slightly lagged behind the
middle, the phase to phase adjustment is okay
b. If any other phase besides the top phase engages first, adjustment is incorrect and must be addressed during
the maintenance stage
c. If the phase to phase adjustment is correct as per 2a, open the switch fully and then close it with a positive,
fast action. Observe if all phases fully engage and lock. Record any non-locking phases.
3. Open the switch slowly in order to observe the operating sequencing of the TECO-Rupter (if so equipped). The
blade will rotate in the jaw contact, unlocking the blade lock mechanism and releasing all pressure on the blade tip.
The quick whips will rotate into the vertical plane and begin to engage the keeper. The blade mounted TECO-
Rupter pick up hardware will also rotate into the vertical plane. The switch blade will begin to move to open. With
the quick whips still engaged, the pickup hardware will engage the TECO-Rupter actuator rod. Shortly thereafter,
the quick whips will release, directing the circuit only through the TECO-Rupter. The switch continues open until
the TECO-Rupter interrupts, or ‘pops’, indicating that its internal mechanism has released. The switch will continue
into the full 90 degree operating position, releasing the TECO-Rupter. The TECO-Rupter will re-cock into its rest
position to be ready for the next open operation.
4. Note: if any or all of the above steps have not sequenced properly make a note so they can be addressed during the
maintenance stage.
Section II: Determine Electrical and Mechanical Status of TECO-Rupter (if so equipped)
1. The interrupter assembly should be hi-potted in accordance with standard testing techniques. All contacts should be
tested at 20kV for one minute. Leakage current should be recorded. Review the data and see if all contacts testing
in the same range. If not, replace vacuum.
Turner Electric www.turnerswitch.com 618-797-5000
2. Check mechanical operation of interrupter. Pull the actuator rod outward and determine if it moves smoothly. If it
does not, replace it. Confirm that the unit ‘pops’ or interrupts in accordance with the factory drawings.
3. Check the fiberglass for degradation. If the tube has ‘bloomed’ then UV light has damaged the paint system. If the
above 1 and 2 tests are good, sand down the entire tube, wash with denatured alcohol and then with water, let dry.
Then paint with Sherwin Williams Poleane Paint.
Section III: Maintain the Switch
1. Place the switch in the open position
2. Mark for position and then remove all reach rods
3. Using the hinge end insulator, slowly rotate the blade from open to close, checking for any bearing seize. If bearing
is seizing or grabbing, replace.
4. Inspect jaw contacts for pitting and lock condition. Replace as required. If in usable condition, wire brush current
transfer surface and check all hardware for tightness. Place Eletrodag on the jaw contact transfer surface
5. Inspect blade tip for pitting and lock condition. Replace as required. If in usable condition, wire brush current
transfer surface and then treat with Electrodag.
6. Inspect TECO-Rupter pickup hardware for pitting and then mark position and rotate it downward so it does not
engage TECO-Rupter. Replace as required.
7. Inspect TECO-Rupter actuator rod for arcing. Replace as required.
8. Inspect hinge end and tighten hardware.
9. Slowly rotate the blade into the jaw contact but do not close. Check contact to blade alignment and lock penetration.
Correct as required. See installation instructions.
10. Open the blade and then slam it closed. Confirm full penetration and lockup.
11. Slowly open the blade and confirm proper operation.
12. Do these steps on all phases and all blades.
13. Inspect upper outboard bearing assemblies for correct operation. Replace as required.
Section IV: Final Switch Adjustment
1. Confirm all VOP levers set in same vertical plane. If not, readjust.
2. Replace the top and middle phase reach rods. Square the operating levers to pipe when the switch is open halfway.
3. Have the ground man move the switch towards close, picking up the top jaw contact and have the operating pressure
held.
4. Move the clevis on the middle phase pivot bearing such that the middle phase lags the top phase by ½ inch.
5. Open and close switch, confirming ease of operation and lock up on close
6. Replace the bottom phase reach rod
7. Have ground man rotate switch towards close, picking up the top jaw contact and have the operating pressure held.
8. Move the clevis on the lower phase pivot bearing such that the lower phase lags the middle phase by ½ inch.
9. Open and close switch several times, confirming ease of operation and lock up on close
10. Rotate TECO-Rupter pick up hardware into position per factory drawing.
11. Slowly open switch, observing proper operation and sequencing of the TECO-Rupter and associated components as
previously described.
12. Firmly close switch. Set manual handle assembly into locking plate such that positive torsional rotation toward the
closed position is maintained at all times.
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