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These instructions do not purport to cover all details or variations in equipment, nor to provide for every possible contingency to be met in connection with installation, operation or maintenance of this equipment. Should further information be desired or should particular problems arise which are not covered sufficiently for customers purposes, the matter should be referred to Turner Electric, LLC at 618-397-1865.RECEIVING & STORING
RECEIVING:
Each group operated switch consists of separately packaged items: 1) Three welded frames; 2) box current carrying parts and control linkage; 3) skid of insulators;4) banded 2" IPS vertical operator pipe, and 5) skid of vacuum interrupter (if required).
When the switch is received the customer should check material against packing list to be sure all parts have been received. If any of the items show physical damage it should be inventoried for missing or broken parts. If damage is found or suspected,file a claim as soon as possible with the transportation company and notify your Turner Representative.STORING:
A reasonable amount of care should be exercised in handling and storing the basic switch. Porcelain Insulators and Vacuum Interrupters are VERY FRAGILE and must be handled with care. All parts should be left in shipping cartons until ready to use. Moisture absorbing cartons should be protected against the elements until ready for use.
INSTALLATION:
1.0 PURPOSE
The purpose of this procedure is to provide guidelines for the installation adjustment and inspection of Turner Electric, LLC switches.2.0 SCOPE
This procedure is applicable to Turner Electric, LLC air and load break switches.3.0 RESPONSIBILITIES
3.1 Construction Field Engineer: Coordinate construction and inspection of switch.
3.2 Assistant Field Construction Engineer: Prime responsibility for on-site construction and proper operation of switch.
4.0 INTRODUCTION
4.1 This procedure is in three (3) sections.
4.1.1 Assembly and adjustment. Section 5.0.
4.1.2 Installation and adjustment of vacuum interrupter. Section 6.0.
4.1.3 Inspection. Section 7.0.
4.2 This guide is intended for use by the crew that installs a TECO switch.
4.3 It is recommended to have one person on each phase frame and each person should have a copy of this guide.
4.4 Each person can do most of the work independently of the others up to the point of tightening the set screws in the pipe-levers.
4.5 It is recommended that each person check the others work to assure that they are getting the same results.
4.6 If the frames and hot parts are being preassembled on the ground, many of the parts, such as blade locks and pins, arc restrictors and pitchforks etc., should be checked before hoisting up onto the structure.
4.7 After final adjustments are made, the switch should be manually operated by the proper personnel to enable them to become familiar with it.
4.8 Note to installer/contractor: IF there are any shortage of parts or problems during installation, please call the Engineering Dept. at Turner Electric Corp. 618-397-1865.
5.0 ASSEMBLY AND ADJUSTMENT
5.1 Small switches (15KV - 69KV) can be preassembled on the ground. Large switches (115KV + Above) due to the weight, may be assembled in the air or on the ground depending on available equipment.
5.1.1 If this switch is being preassembled on the ground, assemble the insulators to all pedestals and then assemble hot parts to insulators.
5.1.2 Leveling screws are provided on all pedestals. On 2- and 3-way switches, the center insulator must be plumbed at right angles to frame, Photo A. On a 1-way switch, plumb the jaw insulator first. The various leveling screws can give the results shown in Fig. 1. Photo B illustrates typical leveling screw location.
5.1.3 Check blade latch to avoid damage before blade tip is allowed to enter contact jaws.
5.2 After the frames have been hoisted and secured to the pole loosen all pipe-guides.
5.3 Hoist the vertical operating pipe (VOP) up thru the pipe-guides while inserting a pipe-lever at each phase.
5.3.1 Some switches require the pipe-lever on the top phase to be inverted and/or to be raised with a spacer. (See Blue Prints.) This is to assure that the pipe-lever and the insulator-pivot-lever are at the same height.
5.3.2 Tighten and pierce the two set screws in the pipe-lever into the VOP on the TOP PHASE ONLY.
5.3.3 This allows the pipe to hang from the thrust bearing. Secure the thrust bearing so that the VOP is in the center of the pole at all locations.
5.3.4 DO NOT tighten the middle and bottom yet. (See Figure 2).
5.4 Mount the remaining VOP parts.
5.5 Assemble the pipe coupling, extra pipe and VOP insulator (if used). Tighten and pierce the set screws in the coupling.
5.6 Mount the adjustable pipe-guide assembly at each phase. Leave loose for adjustment later.
5.7 Mount the operating handle assembly to the structure with approx. 6" of VOP under the plate.
5.7.1 Leave the plate and handle loose. Check to be sure "OPEN-CLOSE" positions are correct. (See Figure 3).
5.8 Adjust pipe-guides.
5.8.1 With all parts loose, extend or adjust the thrust bearing bracket, all the pipe-guides and the handle locking plate so that the VOP is straight from top to bottom. Some guides may require field cutting.
5.9 Begin Final Blade Adjustment.
NOTE: Only done after line construction is completed and conductor dead-ended.5.9.1 If necessary, loosen and readjust the contact jaw assembly to receive the blade tip properly. (See Figure 4 and Figure 4A).
5.9.2 While at the same time maintain at least a 1/16" gap or more between the blade lock and jaw stop. (See Figure 5).
5.9.3 Readjusting the leveling screws can also help make corrections. (See Figure 1).
5.9.4 Check Contact Pressure
To obtain the proper contact pressure, the dimension (A) between the contact fingers should be approx. 1/8" less than the blade tip dimension (B). (See Figure 6).5.9.4.1 The contact fingers can be reformed with an adjustable wrench or a block of wood and a hammer.
5.10 Blade Lock Adjustment (only if necessary)
5.10.1 It should look like Figure 7 when locked .
5.10.2 AND should be checked like Figure 8 when closing.
The latch is shown as the blade has just entered the contact. The slope of the latch is just touching pin. Bump blade in and out by hand to make this check.5.10.3 It should be adjusted like Figure 9.
The latch may be too high or too low. Reform the tab to hold the latch in correct position.5.10.4 CAUTION
Make sure that the latch is never allowed to go up over the pin. This can break the pin and bend the adjustment tab too far. Replacement of the pin and latch would then be necessary. (See Figure 10).5.11 Dual Snap-Out Arc Restrictors.
5.11.1 Check for any deformed parts caused by shipping or handling.
5.11.2 The snap-out fingers should rest like this when switch is closed. (See Figure 11).
5.11.3 When the switch starts to open, the blade and arc fingers will rotate and the lock will disengage. (See Figure 12).
5.11.4 The blade will then move out of the contact but the arc fingers will be retained by the notches in the pitchfork. (See Figure 13).
5.11.5 Both arc restrictors should snap out together. If they do not, the pitchforks may be slightly reformed in either direction. (See Figure 14).
5.11.6 With a person on each phase operate each phase from closed to open slowly by hand several times and observe.
5.12 Operating linkage to be mounted to switch in the following manner.
5.13 Manually close all switches by rotating the insulators. Make sure they are fully closed and locked.
5.13.1 Slide pipe-lever up 2" or until linkage pipe is horizontal. Align all levers in same vertical plane.
5.13.2 Tighten but NOT pierce set screws.
5.13.3 CAUTION: The pipe-lever should never be touching the pipe-guide. This causes excessive friction and possible lock-up during icing conditions. (See Figure 15).
5.14 Slide the handle assembly up 2" from plate.
5.14.1 Swing handle down into "Closed" slot.
5.14.2. Tighten but not pierce set screws. (See Figure 16).
5.15 Assemble reach rods to the pipe-levers and pivot-levers according to the blue prints.
5.15.1 Tighten and pierce the set screws into the reach rod at the pipe-lever end only.
5.15.2 Follow Steps 1 thru 6 in Fig. 17.
TO SET LEVERS PARALLEL:
Levers are easier to set parallel when both levers are "square" with the reach rod. The switch will be half-open. (Photo C) -- (Fine adjustment to be made later.)5.15.3 Slowly close switch and stop as soon as any blade tip touches any jaw contact. The blade tip positions will vary on each phase and will need adjusting.
5.16 Fine adjustments to be performed as follows:
5.16.1 The top phase should close before the middle phase.
5.16.2 The middle should close before the bottom phase.
5.16.3 The amount of "lead" should be just enough to be seen from the ground (approx. 1/2") for each phase. It can be more on larger switches. (See Figure 18).
5.16.4 CAUTION: They should never be opposite.
For example -- if the bottom phase stops first, it also stops the rotation of the VOP at the bottom phase, and thereby preventing the "upper" phases from closing all the way.5.16.5 Mark all 3 points shown in Fig. 19 to check for slippage during trial operation.
5.16.6 Manually close the switch and confirm that all blades are seated and locked in the jaw contact.
5.16.7 Once all blades are latching properly. Re-position the swing handle so that closing force is always placed on the handle by contact made to the inside surface of the close slot on the locking plate. The handle should be forced past the leading edge of the close slot and into the seated position for proper lock-up. See Figure 19A & 19B.
5.17 Manually open switch and drop handle into "open" slot.
5.17.1 Check for slippage at all marks.
5.17.2 CAUTION: Make sure blades are not too close to any grounded members such as down guys, etc.
5.18 Operate switch several times. a) Make sure all blades are latching in the closed position; b) make sure all arcing horns release simultaneously; c) if satisfactory, tighten and pierce all piercing set screws.
5.18.1 The tip of the screw must puncture the inner pipe.
5.18.2 Sometimes a "pop" can be heard, but not always. The screw will usually turn easier immediately after puncture, then continue to turn screw just enough to snug the screw shoulder on the pipe.
5.18.3 CAUTION: Do not attempt to run the screw head all the way down. Just be sure the pipe is punctured and screw is snug. If in doubt -- remove the screw and check for a puncture hole in pipe. (See Figure 20).
5.19 Switch Operation
5.19.1 Open switch and then close it with a fast even motion. (Opening should be a moderate speed -- even motion.)
.............IMPORTANT............
5.19.2 Closing of a TECO Side Break Switch
Swing the handle closed from a full 90 degree (See Photo D-1 & Photo D-2) and follow thru with one -- complete -- fast motion. DO NOT attempt to move it part way closed and then try to jerk or bump it closed. DO NOT attempt to "walk it around" with the handle.5.19.3 After several operations it is suggested that supervisory personnel re-inspect blades to be sure latches are operating properly. If not, the switches have not been properly closed. (Not enough closing speed is being developed.)
VACUUM INTERRUPTERS FOR PHASE OVER PHASE AIR BREAK SWITCHES 15KV -- 161KV
6.0 INSTALLATION INSTRUCTIONS
6.1 Receiving Instructions
6.1.1 Handle with extreme care.
6.1.2 This equipment has been fully tested at the factory. It is important that the interrupter assembly be inspected for concealed damage.
6.1.3 You should file a claim with delivering carrier if any of the goods called for on this shipment are short or damaged. DO NOT accept them until the driver makes a damage or short notation on your freight bill. If any concealed loss or damage is discovered notify the local freight agent within fifteen (15) days from delivery and request him to make an inspection! This is absolutely necessary. Unless you do this, the transportation companies will not entertain your claim for loss or damage. The carriers inspection report should accompany your formal claim, together with the necessary papers.
6.2 HI-POT METHODS AND PROCEDURES
6.2.1 Locate vacuum interrupter so that there is proper clearance from surrounding objects.
6.2.2 Prop open interrupter unit with a piece of dry wood or fiberglass. Check that the contacts are open by listening for a "pop" sound when the arm is moved to the open position.
6.2.3 High potential testing, in addition to careful visual inspection, provides the best means of verifying the condition of the vacuum interrupter. Each vacuum module should be given 60Hz AC high potential test of 20-35KV rms for one minute across its open contacts before being put into service. The same test should be applied to the interrupters when serviced for normal maintenance.
6.2.4 Prior to applying test voltage across the open interrupter contacts, the surface of its insulating envelope or the outer insulating tube that houses the interrupter should be dry and clean of any surface contaminants. Normally wiping with methanol on a clean cloth or with an industrial wiper will be sufficient.
6.2.5 A high potential voltage source is then connected across the open interrupter contacts and the voltage slowly increased to the test voltage. A 20-30KV rms Hi-Pot test and a continuity check should be made on each vacuum module. (See Figure 21).
High voltages are not required to determine the quality of vacuum. A defective module will break down below 20KV rms. AC leakage current and reactive current in micro amps may result in higher than normal readings due to system shunt capacity. Interrupters above 15KV, have additional shunt capacitance across each interrupter for voltage grading.6.3 Installation of TECO Rupter
6.3.1 Read instructions thoroughly before proceeding with installation.
6.3.2 The air break switch must be properly adjusted per Section 5.
6.3.3 Open all blades. Assemble pick-up hardware to each blade using Hook Radius dimension as shown on attached drawing. Please note that with the blade cammed up the angle of the pick-up hook bracket will be 22 1/2 degrees. When the blade is uncammed the pick-up hook bracket will be vertical.
PHOTO "E" - LOCATING HOOK RADIUS
PHOTO "F" - PICK-UP HOOK ATTITUDE -- BLADE CAMMED UP
PHOTO "G" - PICK-UP HOOK ATTITUDE -- BLADE OPEN
6.3.4 Close blade and adjust vertical height of pick-up hook to dimension shown on applicable drawing with technique shown on Photo H.
6.3.5 With all three switches closed, mark common contact plate and top of the center insulator for reference. Remove four 1/2-13 X 7/8 hex head tap screws.
6.3.6 Mount the interrupter atop the center insulator and secure with new 1/2-13 X 1-1/2 bolts furnished. Prior to tightening visually locate interrupter equidistant from the two side contacts. See Photo I. Tighten hex head cap screws. Check to make sure that reference marks identified in article 6.3.5 have not changed.
6.3.7 Close one three-phase switch.
6.3.8 Open one three-phase switch, with a person on each phase observe the following sequence.
6.3.8.1 Blade uncames 22-1/2 degrees.
6.3.8.2 During the uncamming the arc restrictors rotate about the blade axis and move to the latching, vertical position.
6.3.8.3 As the blade moves to the open position the load is carried thru the arc horns.
6.3.8.4 At a factory programmed position the pick-up hook engages the interrupter arm. For a short time a parallel path is developed, arc restrictors then release. At this point the interrupter contacts are closed and a circuit is established. See Photo J.
6.3.8.5 Blade proceeds to the unload position. Care should be exercised at this point to be sure that the interrupter audibly unloads before pick-up hook enters the red area. See Photo K.
6.3.8.6 Once in the red area the interrupter will have opened -- separating the internal vacuum contacts. Travel within the red area is overtravel that holds the contacts open to permit the arc to clear in a timely manner and allow the blade to move further out of the restrike zone.
6.2.8.7 Once pick-up hook drops off interrupter arm, the vacuum interrupter recocks itself so that one of the other switches can selectively utilize it.
6.3.8.8 Close the switch slowly to be sure that the pick-up hook passes by the interrupter arm without restriction. See Photo L.
6.3.8.9 Open and close switch several times to be sure that programmed activities happen.
6.3.9 Repeat operation on the other switches.
6.3.10 As a final check it is recommended that all phases be checked for continuity thru the air switch from its fully closed position to the trip position of the vacuum interrupter. An ohmmeter or other suitable continuity device, should be used. (See Photo M).
With the air switch in the open position check all phases for continuity across the vacuum interrupters. This test assures that the interrupter properly closes or re-sets and is ready for the next operation.7.0 INSPECTION
7.1 Structure
7.1.1 Check for bow and plum of structure.
7.1.2 Check for structure twist.
7.1.3 Check down guys.
7.1.3.1 Direction
7.1.3.2 Tension
7.1.4 Check all attachments.
7.2 Switches
7.2.1 Check tightness of fasteners at all assemblies.
7.2.1.1 Top of insulator
7.2.1.2 Bottom of insulator
7.2.1.3 Contact area
7.2.1.4 Blade
7.2.1.5 Pitchfork
7.2.1.6 Whips
7.2.1.7 Knuckle assembly
7.2.1.8 Interrupters
7.3 Open Switch Operation
7.3.1 Open switch slowly. Observe sequential operation of switch.
7.3.2 Blade uncams 22-1/2 degrees; arc restrictors rotate about blade centerline and carry the current until such time blade is out of the restrike zone. Arc restrictors unload simultaneously. Blade moves to open position.
7.3.3 Interrupter Application. The blade uncams 22-1/2 degrees; arc restrictors and interrupter arm pick-up hook rotate about the blade centerline. The load is carried thru the arc restrictors until such time the pick-up hook engages the interrupter arm. For a short time the arc restrictors and pick-up hook provide a parallel path to insure a firm connection between the pick-up hook and interrupter arm. The arc restrictors drop off establishing the circuit thru the interrupter. IMPORTANT: Interruption to take place before pick-up hook enters the red zone at the tip of the interrupter arm. The additional 1-1/2 - 2" travel within the red zone is overtravel designed to insure proper sequential operation of the interrupter. As the blade moves to full open position the interrupter recocks itself for the next operation.
7.4 Close Switch Operation
7.4.1 Close switch slowly and observe if adjustments of blade tip in relation to the contact jaw as defined in Article 5.16 are intact.
7.4.1.1 Top blade entering contact
7.4.1.2 Middle blade 1/2" out
7.4.1.3 Bottom blade 1" out
7.5 Open Switch
7.5.1 With normal speed
7.6 Close Switch
7.6.1 With HARD FAST MOTION -- See Article 5.19.
7.7 Check after several operations.
7.7.1 Make sure no slippage has occurred.
7.8. Check the operating handle and tightness of ground wire.
7.8.1 Make sure that when the handle is in the "closed" slot, it is lightly forcing or holding the switch closed.
©2001-06 Turner Electric, LLC. : Last updated: Nov 05
