Delta Star

TMX

Group Operated Vertical Break Switch

Installation and Maintenance Instructions

Notice

“Delta-Star” switches and operating mechanisms are designed for rapid and simple installation. By carefully following these instructions, the possibility of error and delay can be minimized. Time spent in reading the instructions can save many hours of installation time.

Table of Contents

Subject

Receiving Inspection, Handling and Storage

TMX Nomenclature

Installation and Adjustment

Assembly of Non-factory Assembled Switches

Installation and Adjustment

Maintenance

Page

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4

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These instructions are written to cover the installation of the most common switches and mechanisms. They do not take the place of the switch and mechanism drawing layouts furnished with this order, but are intended to supplement them. It may be apparent that these instruction do not adequately meets the demands of your installation. In such instances where the installation is not covered by these instruction please contact the factory for assistance at 1-800-886-1865.

Installation and Maintenance Instructions

SHIPMENT & INSPECTION

Check the total shipment for completeness against the bill of material and installation drawings. If the switch shipping crate or the switch show evidence of shipping damage note the damage on the bill of lading and notify the appropriate person in your territory for inspection.

Uncrate and/or remove all wire ties and check to see that the switch is undamaged. When uncrating, be careful not to discard any attached bags of parts. If damage is evident, report immediately to the appropriate person in your territory for inspection.

The switches are normally shipped with the live parts bolted to the base hardware, the insulators being shipped separately.

Bolts or other ancillary parts for use with the switch are attached to the switch in a burlap bag. Do not discard these parts. Operating Mechanism components are shipped on a maximum assembled basis and labeled, showing part numbers for their associated operating mechanism drawing.

The operating mechanism components are crated, boxed, or bagged, and shipped separately from the switch units. All necessary pipe is bundled and tagged for shipment.

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WARNING

Do not remove the hinge bolts on the Vertical Break

Switch without opening the switch first if it is to be horizontally mounted or closing the switch if it is to be vertically mounted. The counter balance can pose a significant personal risk if these important safety instruction are not followed.

Never disassemble the counter balance on the switch live part mechanism assembly, as these are properly adjusted at the factory.

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TMX Nomenclature

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Installation, Adjustment and Maintenance

WARNING

Before any installation is started, make sure that applicable equipment is de-energized and properly grounded.

Protect the installers adequately from any adjacent electrically energized parts by using barriers, screens, etc.

Switches are normally shipped with the live parts bolted to the base. If the switch is factory assembled with insulators, skip section one and move on to section two. It is recommended that factory assembled switches be checked for alignment and proper adjustment after being mounted on the structure.

1. Assembly

Each switch is stenciled numerically for identification, i.e. 1, 11, 111.

This identification number appears on the operation mechanism drawing. The switches are shipped without insulators which are to be installed in the field; some minor adjustment may be necessary. The following procedure is for assembling and adjusting the switch units.

(A) Disengage the live parts from the base hardware. Do not disturb the position of the operating levers. Keep the blade and hinge assemblies together.

(B) Mount the switch base onto the structure. Make sure that the structure is squared and level. Shim as needed to insure that the base is not put into a twist or bind. This could make proper switch operation difficult to achieve.

(C) Install the insulators to the pivot and hat brackets. It is best to use studs in the bottom of the insulators to make installation easier. Check the rear (rotating) insulator to see that it is running concentric. If an insulator is not square from end to end, the rotation could cause it to wobble. Use the leveling screws on the pivot to true up the rotation. If this cannot be achieved, another insulator should be used.

(D) Attach the live parts on top of the insulators. Draw up all bolts but do not tighten fully. Install the jaw assembly to the front insulator with bolts. Set the hinge and blade assemblies on the two

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rear insulators. Attach the hinge to the center insulator with bolts. With the blade in the uncammed position, install the bolts down through the rotator into the rear insulator. Check the alignment of the hinge with the jaw and tighten the mounting bolts.

With the blade still uncammed the tip is to be centered in between the contact fingers, then tighten the mounting bolts for the jaw.

(E) Arcing horns, if used, are shipped with the switch. However, the stationary horn is not attached for shipment. Install the stationary horn. Adjust the arcing horn so it does not touch when the switch is in the closed position, but makes contact as the blade rotates open. Only a slight pressure should exist between the horns. Excessive pressure will cause binding during operation of the switch.

2. Installation and Adjustment

Install the switch units onto the structure as noted in “1-B” securely bolting the base in the position sequence shown on the operating mechanism drawing.

(A) A vertical break switch is in the closed position when the blade tip is fully engaged in the jaw between the contact fingers. In this position the blade would be parallel to the mounting base. The travel of the blade is in a plane that passes through the longitudinal axis of the switch phase.

(B) Fully close all phases manually by rotating the rear insulator. In this position the blade tip should be sitting level in the jaw and in line with the contact finger back up springs. The crank arm should be against the closed stop.

The arcing horn should not be in contact with the bypass arm.

See figure at right.

1. If the blade tip is not laying flat in the jaw, adjust the close stop on the bridge. Be careful not to adjust it too far as not to allow the mechanism to over center and thereby not locking the switch in a closed position.

2. In the unlikely event that there is not sufficient adjustment in the stop to allow for the blade tip to lay flat, then the blade will need to be rotated in the blade adaptor. Loosen the ubolts on the blade adaptor and slightly rotate the blade. Do not remove the blade. Tighten the nuts on the u-bolts and check the positioning again. Repeat if necessary to achieve

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proper positioning.

3. If the blade tip is more than 0.5 inches above or below the contact finger back-up spring, the position will need to be adjusted. Loosen the jam nuts on the turnbuckle between the crank arm and the connector. Lengthen or shorten the exposed turnbuckle as needed to get the blade tip within tolerance. Be sure to firmly tighten the jam nuts back up or the switch could come out of adjustment.

(C) Open each phase and see that all the blades are in line with each other at just past 90°. If not, adjust the open stop on the bridge to achieve the proper position. Close each phase.

(D) Attach the inter-phase pipe and clevises to the levers on the pivots. Take up the slack in the pipe and snug the piercing bolts in the clevises. Do not pierce the pipe at this time.

(E) Attach the reach rod from the operating mechanism to the lever on the drive phase pivot.

(F) Open the switch using the operator. If it is a motor operator, use the manual handle. Open the switch and check the position of the blades to see that they are inline and past 90°. Close the switch and check to see that the blade tips are in the proper closed position as outlined in 2-B.

(G) If either of the open or closed conditions are not met, disconnect the drive and check the phase manually. After it operates satisfactorily manually, reattach the clevis and adjust as needed to achieve correct operation of the phase.

(H) Once all operations have been satisfactorily completed, the piercing bolts can be tightened completely.

3. Maintenance

Delta-Star TMX switches are designed to operate with little or no maintenance over the life of the switch. However, when inspections are made the following will result in an easier operating switch.

Special Note:

Do not use sandpaper, emery cloth or any emery product on the contacts

(A) Clean contacts with a steel wool, and apply a thin coat of Nye

Rheolube 368 or equal conducting PAO grease.

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(B) The hinge contacts are sealed and should never require maintenance.

(C) All conducting aluminum connections should be properly prepared and coated with Penetrox A or equal oxide–inhibiting compound.

(D) Straighten or replace damaged arcing horns.

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