Erection/Installations

Back to contents page 8.4.1 Structures

Back to contents page

i) Refer the site layout drawings and compare with equipment General Assembly Drawing.

ii) Identify the structures according to the General Assembly Drawing iii) Structure assembly is lifted and fixed over the plinth (Without

damaging the foundation bolts)

iv) Assemble washer, spring washer and nuts in all foundation bolts.

v) Check for level at the top of the structure in both directions by using spirit levels. If required give shims below the base plate of structure and tighten the nuts.

vi) All other structures should be assembled in similar way 8.4.2 Base Assembly

Back to contents page

i) Identify the Base Assembly from Equipment General Assembly drawing.

ii) Lift the base assembly by using proper ropes and place it over the relevant structure

iii) After keeping it over the base without removing the rope align it to the mounting hole of base and top plate of structure and fix the bolts and nuts and remove the rope.

iv) Check for level of flanges in both direction by using spirit level.

v) If necessary add shims below the leg of the base and align it.

vi) Tighten all the Bolts.

vii) Repeat the installation process for other two poles also.

viii)Ensure the Centre line of same pole and centre line of other phases are aligned

ix) After completing the installation keep all the base assemblies in open position

8.4.3 Insulators

Back to contents page

i) The top middle and bottom units of Insulators should be identified by using Insulator Drawing.

ii) The bottom and middle units are assembled together by using proper bolts and nuts. Lift the Insulator stack by using proper hook and placed over the base assembly by ensuring the top 4 holes position.

iii) Without removing the hook align the holes and fix all bolts.

iv) The level of top surface of insulator should be checked by spirit level/plumb and if necessary the shims should be inserted below the bottom flange of the insulator or/and between two insulator unit flanges .

v) Now rotate the shaft assembly & check for the rotation of insulator

& its eccentricity.

vi) The same procedure is to be repeated for the other side of same pole also

vii) In the same way the top unit of insulator and middle unit are installed On both sides.

8.4.4 Contacts Assembly (Male and Female Assembly)

Back to contents page

i) Identify the Assembly as per General Assembly Drawing ii) Keep the Insulator corona ring on top of the Insulator

iii) Lift the Male Assembly by using proper sized rope and place it over the insulator above corona ring.

iv) Without removing the rope align the holes and fix the screws.

v) Repeat the similar process for female assembly.

vi) Rotate the bearing shaft assembly and check for alignment of Contacts assembly for horizontal alignment. Shims should be inserted between the mounting flange of Assembly and top of

the insulator at relevant side. Similarly for vertical alignment necessary shims should be inserted between insulator flange and top of shaft assembly flange.

vii) If the entry is not smooth, loosen the contacts Mounting screws and push the contacts forward or backward to get free entry.

viii) After achieving the entry check for centre line of Male and Female in both directions.

ix) Now moving part should be rotated 2 to 3 times to ensure the proper alignment

x) The Corona ring assembly should be identified for male and female unit and connected properly to it.

xi) Moving part should be operated two to three times for checking the free movement and also check that the contact corona ring are not fouling each other

8.4.5 Connecting Disconnector

Back to contents page

i) Manually set mechanism and disconnector to be connected into fully OPEN position (Arrow mark on top of mechanism cabinet indicates the 'open' and 'close' positions).

ii) If mechanical interlock keys are fitted, it will be necessary to obtain the relevant keys to make mechanism operational.

iii) Align the fixing hole and bolt them together to achieve desired tightness.

iv) Ensure that the mounting channel on the drive and the structure are matching.

v) Level the box by placing the spirit level on output shaft flange in two directions.

vi) Provide shim wherever required.

vii) Check for centre line and verticality between torque bearing flange and drive flange with a plumb.

viii) Introduce Universal Coupling as called for in the General Arrangement Drawing.

ix) Measure exact height between torque bearing flange and top of universal flange.

x) Cut the operating pipe with the specified clearance to facilitate smooth entry.

xi) Weld the vernier flange properly keeping the flange perpendicular to the centreline of the pipe. Level and bolt the same. The drive is now ready for operation. Mounting angles of mechanism to structure are slotted to provide horizontal adjustment. Adjust the mechanism so that the vertical drive tube rotates TRUE.

xii) Cabling (internal/external) be completed as per schematic drawing. Ensure that all electrical interlocks are wired properly.

xiii) Before energising the circuitry, interlock wiring and control wiring should be checked by multimeter (as per schematic drawings) 8.4.6 Controls for Electrical Operating Equipment

Back to contents page

A hinged panel on the right hand side of the cabinet carries the electrical controls for operation of the mechanism. Controls for normal

operation are mounted on the front of the panel and are accessible immediately the outer cabinet door is opened

These comprise :

i) Local OPEN and CLOSE Control Switch

ii) In case of individual pole drives the master control cabinet will have push buttons for operating/closing also.

iii) Local/Remote Selector Switch iv) Heater/Light Switch