FIELD OF THE INVENTION
The present invention generally relates to a conductor mounting device. More particularly, the present invention relates to a sliding and rigid conductor mounting device for Isolated phase busduct (IPB) adaptable In between generator and generator transformer of power plant upto a capacity of 250MW suitable for fault level up to 172KA rms.
BACKGROUND OF THE INVENTION
The busduct Is a conductive device which carries current at high voltage (HV) as well as at medium voltage (MV). The Isolated phase busduct conductor is of round/ rectangular or octagonal cross sectional shape. The conductor Is housed In round enclosure. The mounting of conductor with its enclosure is to be accomplished, keeping in view of the parameter like over all safely, the short circuit forces, the minimum electrical clearances requirements and the creepage requirement as per KV class of busduct Isolated phase busduct (IPB) Is connected between generator and generator transformer in a power generating station. In between a generator and generator transformer tap off busduct from main busduct Is connected to various power plant equipment like SPVT cubicle, VT cubicle, NG cubicle excitation transformer, unit auxiliary transformer etc.
The manufacturers of Busduct are making very simple and conventional mounting arrangement since long period. But over the years many practical problems were observed and addressed by various design
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changes. Still there were many scope for enhance features which have been implemented in the present invention.
Earlier and existing mounting arrangement were not addressing:-
a. The supporting deficiency at rigid mounting locations due to thermal
expansion/contraction.
b. The requirement of lateral alignment of conductor during short circuit
force condition.
c. The issue of standardization in hardware length.
d. The higher level and duration of short circuit fault level as at present.
e. The stringent requirement of air leakages within 10% approx and
also meeting air and water tightness requirements as per standard.
f. Capability of Busduct conductor mounting arrangement to sustain
seismic excitation.
3 OBJECTS OF THE INVENTION
It is therefore, an object of the present invention to propose improvements in conductor mounting device of isolated phase busduct which eliminates the deficiencies In prior art.
Another object of the present Invention Is to propose a sliding and rigid conductor mounting device of Isolated phase busduct which Is perfectly and centrally fitted with the enclosure.
A still another object of the present invention Is to propose a sliding and rigid conductor mounting device of isolated phase busduct where in air/water leakages are within permissible limit.
A further object of the present invention is to propose a sliding and rigid conductor mounting device of isolated phase busduct which sustains forces generated In the event of short circuit in the power plant.
A still further object of the present Invention is to propose a sliding and rigid conductor mounting device of isolated phase busduct which provides flexibility in axial direction for expansion and contraction due to change in temperature.
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An yet further object of the present invention is to propose a sliding and rigid conductor mounting device of Isolated phase busduct with Its enclosure which standardises hardware irrespective of enclosure sizes.
SUMMARY OF THE INVENTION
One common type of conductor mounting device (Rigid/Sliding) is Installed for all the three phases of the busduct and throughout the entire length of busduct. Three insulators are placed and disposed at 90 degree apart between first conductor to second conductor and again 90 apart from second conductor to third conductor. So, first conductor and third conductor are located 180°C apart ie. just opposite position.
The mechanism for mounting arrangement with busduct enclosure Is common for all the three Insulators position e.g. at 'L',' M' and 'R' position in figure.
The mounting device at insulator top with the conductor comprising.
a) Rigid mounting arrangement of conductor
b) Sliding mounting arrangement of conductor.
For rigid mounting, the conductor Is fastened with the insulator through packing materials in between them by means of hex bolt spring washer,
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machined washer and for sliding mounting, the conductor is fastened with the Insulator through a sleeve and packing materials In between them by means of hex bolt with washer and spring washer. The conductor has slots along the length of the conductor to permit expansion/contraction due to temp variations.
Rigid and sliding arrangements are provided only at 'M' positions at insulator top with the conductor. The remaining two side supports (Right & left) of conductor are provided with sliding arrangement and remains same irrespective of rigid or sliding mounting arrangement conductor support.
TESTS CONDUCTED:
The specimen type test assembly of busducts meeting to requirements of IS: 8084 has been validated by type tests and have successfully passed the tests for:
a. Short circuit fault level of 172 KA rms for 1 sec/480 KA peak as per
IS: 8084. at CPRI, Bhopal.
b. Simulated seismic excitation independently along vertical and two
orthogonal horizontal axes, +/- 0.15 g vertical and +/- 0.3 g
horizontal for a minimum duration of 30 sees. In each case at IIT,
Madras per IS: 1893.
6 c. Air and water tightness tests as per IS: 8084 appendlx-F.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig-1 Shows a schematic diagram for three Insulators rigid mounting and sliding mounting device.
Flg-2 Shows a schematic diagram for conductor mounting device for I.P. Busduct enclosure with insulator's bottom and are common for L, M and R location.
Fig-3 Shows a schematic diagram for rigid conductor mounting for I.P. Busduct for central support (M).
Fig-4 Shows a schematic diagram for sliding conductor mounting device for centre support (middle).
Fig-5 Shows a schematic diagram for sliding conductor mounting device for both side supports Irrespective of rigid/sliding arrangement.
DETAILS DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Fig-1 shows the position of all the three insulators mounting for conductor, one at middle (M), and two sides i.e at Right side (R) and other at left side
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(L) are disposed around a aluminum channel ring (C) over the busduct enclosure (E).
Flg-2 shows bottom part of the Insulator mounting device Inside the busduct aluminum Alloy enclosure (E). The enclosure (E) have 72 mm dla holes (3 nos 90degree apart) to accommodate Insulator support base (002). The Insulator support base is party Inside the 72 mm dla hole In enclosure (E) having with a sealing ring (018). This sealing ring (018) acts as total sealing and confirms to air and water tightness requirement as specified in IS: 8084, appendlx-F,
Four numbers of hex socket head cap screw (010) having a length such that It can enter at least 2 mm to 3mm below the flat surface of Insulating support base so that it does not damage rubber gasket (006) dispose over it A spring plate (004) rests on a pin (008). The pin (008) keeps a gap between enclosure (E) and spring plates (004) for resilience action. The insulator (001) rest over a rubber gasket (006) and tightened properly with hex socket head cap screw (012) to form integral part with the enclosure/channel ring.
The whole assembly as show In Fig-2, now acts as resilient and air/water proof arrangement for busduct conductor support.
Hg-3 shows a provision for rigid mounting of the conductor (C) with insulator (001) top. This detail Is provided for conductor (C) mounting for
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ducts having bends and also for ducts In vertical placement A packer material (017) which Is direct contact with conductor (C) is manufactured with round or fiat profile depending upon the geometry of conductor (C). This device offers a firm grip to the conductor (C) with the Insulator (001). When hardware Items like hex bots, spring washer and machined washer (013, 015,020) are mounted the arrangement forms rigid mounting.
Fig—3 and fig-4 are Identical except flg-4, which contains an addition Item sleeve (016). The diameter of sleeve (016) is such that it loose fits into the conductor (C) having slots for sliding action. A larger washer (014) Is placed over it and tightened with hardware items like hex bolt (013) and spring washer (015). In this arrangement tightening pressure applies on sleeve via large washer and hence conductor Is free to slide. This takes up the increase in length of conductor due to temperature variations of conductor and hence there is no buckling/bend in conductor.
Fig-5 is common to both rigid and sliding of conductor mounting device with the insulator (001). Side wise (both sides) supports of conductor are as per this figure. The length of hardware Items In fig 2, 3, 4 Is such that the hex bolt (013) do not touch the end of the threaded insert in the insulator (001)
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KEY FEATURES
Reference Character Items/Features Figure
020 Machined Washer M-20 3
019 Packer 5mrn to 25mm 5
018 Seating ring 2
017 Packer 5/6/8/12/16mm TK. 3,4
016 Sleeve 4
015 Washer Spring M20 3,4,5
014 MCD Washer M-20 4,5
013 Hex. HD. Bolt Steel M20 X 50/65/75mm LG. 3,4,5
012 Hex. Socket HD. Cap Screw M16X80/85/90mmLG 2
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Reference Character Items/Features Figure
011 Multi Tooth Lock Washer A16.5 2
010 Hex. Socket HD. Cap Screw M16X50LG.
009 Split Pin 3X35LG 2
008 Pin 160x104 LG. 2
007 Gasket 3TKK 2
006 Rubber Gasket 6TK 2
005 Square Plate 2
004 Spring Plate 3.2TK. 2
003 Bottom Block 13.5/ 15.5/17.5mmTK. 2
002 Insulator Support Base 2
001 Insulator 175 HT/230HT/250mmHT. 2,3,4,5
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Reference Character Items/Features Figure
C Al. alloy conductor 1
E AL alloy enclosure 1
L Left side insulator 1
mount
R Right ride Insulator 1
mount
M Bottom insulator mount 1
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WE CLAIM
1. A sliding and rigid conductor mounting device of Isolated phase busduct comprising.
• three Identical Insulators (001) which are placed at 90° degree apart from first Insulator support (L) to second Insulator support (M) and from second insulator support (M) to third insulator support (R) with its enclosure and
- the second/bottom insulator support (M) mounting provided
with both rigid and sliding arrangement and
- the side insulator supports (R,L) of the conductor (C) are with
sliding arrangement and
- the rigid mounting arrangement comprising of fastening the
conductor (C) with the Insulator (001) through a packing
material (017) in between them and
- the sliding arrangement comprising of fastening conductor (C)
with the insulator (001) through a packing material (017) In
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between them and through a sleeve ring (016) embodied in the conductor (C) having slotted hole.
2. The device as claimed in claim 1 wherein conductor (C) mounting is
centrally disposed with the enclosure (E).
3. The device as claimed in claim 1 wherein for rigid mounting, the
conductor (C) is fastened with insulator (001) by means of hex bolt
(013) with spring washer (015) and machine washer (014).
4. The device as claimed in claim 1 wherein for sliding mounting, the
conductor is fastened with insulator by means of hex bolt (012) with
washer (014) and spring washer (015) and the hex bolt (013) passes
through a sleeve ring (016) embodied in the conductor (C) having
slots.
5. The sliding and rigid conductor mounting device of isolated phase busduct substantially illustrated and described herein with accompanying figures.

Dated this 8th day of DECEMBER 2006
One common type of conductor miountlng device (Rlgld/Slidlng) is installed
for all the three phases of the busduct and throughout the entire length of busduct. Three insulators are plbced and. disposed at 90 degree apart
between first conductor to second conductor and agaln 90 apart from
second conductor to thlrd conductor. So, first conductor and thlrd
conductor are located 180°C apart ie. just opposite p&Jon.
The mechanism for mounting arrange.ment with busduct encbsure Is
common for all the three insulators pcwition e.g. at ‘L’, ‘M’ and ‘R’ position
in flgure.
The mounting device at Insulator top with the conductor comprising.
a) Rigid mounting arrangement of conductor
b) Slldlng mounting arrangement of conductor.
For rigid mounting, the conductor ls fastened with the insulator through
packing materials in between them by means of hex bolt spring washer, 5
machined washer and for sliding mountlng, the conductor is fastened wlth
the insulator through a sleeve and packing materials in between them by
means of hex bolt with washer and spring washer. The conductor has slots
along the length of the conductor to permlt expansion/contraction due to
temp varlatlons.
Rigld and sliding arrangements are provided only at ‘M’ positlons at
insulator top wlth the conductor. The remaining two side supports (Rlght &
left) of conductor are provided with sliding arrangement and remains same
irrespective of rlgid or sliding mounting arrangement conductor support.