Title of Invention

AN ADJUSTABLE INSULATING HOOD FOR ELECTRICAL TERMINATION

Abstract

The present invention provides an insulatiion hood for electrical termination comprising an outer hood for covering a projecting legngth of a terminal; and lockably arranged length of a lug barrel for providing isolation of termination. The outer hood is provided with barriers and the inner hood is provided with a shield to provide isolation between the termination far beyond the length of the terminals. Said insuation hood may be fitted on to an electrical termination having a copper lug or an aluminum lug or both.

Full Text

FORM 2 THE PATENTS ACT, 1970 (39 of 1970) COMPLETE SPECIFICATION [See section 10; Rule 13] AN ADJUSTABLE INSULATING HOOD FOR ELECTRICAL TERMINATION; LARSEN & TOUBRO LIMITED A COMPANY INCORPORATED UNDER THE COMPANIES ACT, 1956, WHOSE ADDRESS IS L&T HOUSE, BALLARD ESTATE, MUMBAI - 400 001, MAHARASHTRA, INDIA. THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THIS INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFOMED. Therefore, there is a requirement for an insulation hood which can be used for all types of electrical cables including copper cables and aluminium cables when used on similar Switchgear electrical terminations. The present invention provides an adjustable insulation hood for electrical terminations, particularly for Switchgear products. The inventive insulation hood provides insulation to all types of cables or lugs including aluminium and copper lugs. Unlike the existing protective hoods, the inventive insulation hood can be adjusted even after mounting on the switchgear product which preclude potential shock hazard. Moreover, it provides a shield between the adjacent terminations thereby increases electrical clearance between the adjacent terminations as well as lug barrels over an extended length. The present invention provides adjustable insulation hood which can be used for single termination of switchgear products. The present invention provides adjustable insulation hood which can be used for three or four terminations of switchgear products. Dated this 9th day of February, 2004. FOR LARSEN & TOUBRO LIMITED By their I FIELD OF INVENTION This invention relates to insulation hoods for electrical terminations, particularly to Switchgear Product Terminations. BACKGROUND Various types of insulation hoods are available for electrical terminations. Lugged cables are generally used for switchgear products, which have protruding terminations. There is a risk of human contact with the live termination and lug barrel during work, which necessitates the use of insulations to such electrical terminations. It is also known that protective shrouds, insulation barriers and the like provide protection against such accidental contact with electrical terminations. Further, they are also known to increase air clearances between electrical terminations preventing flashover between electrical terminations. Japanese Patent No. JP11167854 discloses an electromagnetic contractor with a terminal covering made of an electric insulation material having a guidance protruding line formed in the terminal covering including a slide support which extends from both sides to the arc box. Further, slide guide rails are provided on the sides of the arc box to engage the slide support of terminal covering. By this engagement, the terminal covering slides in the direction which opens and closes the arrangement section of the terminal to the arc box. The terminal covering is provided with a hole having a screw thread engaging the terminal covering to the arc box. The slide is regulated by the length of the hole and screw thread in arbitrary positions of the slide with the limits from the arc box. Two terminal coverings, right and left, are 2 provided to cover terminations on both the sides of the arc box. The terminal covering is drawn out to cover the sides of the arch box. The terminal covering of Japanese Patent caters to cover only the projecting length of the terminal. Further, the arc box should be provided with slide guide rails to engage the slide support. The terminal covering is not being suitable for use in any electrical termination, as the arc box has to be modified to engage the slide support. Further, the terminal covering isolates terminals only for a length of the projection of the terminal. The protective hoods existing in the art are of fixed length and therefore, protective hoods of different sizes are required to suit different type of electrical cables or lugs such as copper cables or lugs and aluminum cables or lugs when used for similar electrical terminations. Therefore, there is a requirement for an insulation hood that can suit different type of electrical cables or lugs when used for similar electrical terminations. It is the object of the present invention to provide an insulation hood which can be used for all types of electrical cables including copper cables or lugs and aluminum cables or lugs when used on similar electrical terminations, for example switchgear terminations. SUMMARY OF INVENTION The present invention provides an adjustable insulation hood for electrical termination comprising an outer hood for covering a projecting length of a terminal; and lockably arranged to an inner hood whereby the hood is adjusted to an extended length of a lug barrel for providing isolation of termination. The outer hood is provided with barriers and the inner hood is 3 provided with a shield to provide isolation between the terminations far beyond the length of the terminals. A slit on outer hood lockably adjusts the length of the hood and a screw lockably engages the outer hood and the inner hood. The insulation hood of the present invention may be fitted on to an electrical termination having a copper lug or an aluminum lug or both. The length of the hood may be adjusted according to the length of the lug even after mounting. BRIEF DESCRIPTION OF DRAWINGS Fig 1. shows a perspective view of insulation hood. Fig 2. shows perspective view of outer hood. Fig 3 shows the perspective view of the inner hood. Fig 4 shows the insulation hood arranged on an electrical termination. Fig 5 shows the insulation hood in extended position arranged on an electrical termination. Fig 6 shows the perspective view insulation hood for single termination. DETAILED DESCRIPTION OF THE INVENTION Fig 1 shows the adjustable insulation hood according to the present invention having an outer hood (10) for covering a projecting length of a terminal (not shown) lockably arranged to an inner hood (12). The outer hood is further provided with barriers (14) (as shown in figure 2) for providing isolation of terminals (not shown). The outer hood (10) is provided with slits (18) for lockably adjusting the length of the inner hood (12). Holes (28) are provided on the outer hood (10) for mounting the insulation hood 4 onto a Switchgear (30). as shown in figure 4. Figure 4,5;and 6 shows the insulation hood mounted on the Switchgear (30). The barriers (14) have a slanting portion (34) to accommodate the inner hood. The slanting portions (34) may be straight or curved as desired to accommodate the inner hood. Figure 3 shows the inner hood (12) of the present invention having shields (16) for providing isolation between the terminals (not shown). A slit (20) is provided on one side of the inner hood (12) to adapt to the barriers (14) of the outer hood (10) in a sliding manner. A threaded hole (32) is provided on the inner hood (10) to lockably engage the outer hood through the slit (18). A screw (22) lockably engages the inner hood (12) to the outer hood (10). The insulation hood of the present invention may be fitted on to an electrical termination having a copper lug or an aluminum lug or both. The length of the insulation hood may be adjusted according to the length of the lug even after mounting. For example, when an electrical termination with copper lug is replaced to an aluminum lug, the insulation hood of the present invention shall be extended and locked to provide insulation for an aluminum lug. Similarly, when an electrical termination having an aluminum lug is replaced to a copper lug, the hood shall be adjusted to suit the copper lug. The insulation hood of the present invention may be adjusted according to the requirement; and mounted on the switchgear. Whenever required, the insulation hood may be adjusted even after mounting on the switchgear. Further, the insulation hood shall be easily mounted on the switchgear of any type. It does not require any modification in the switchgear to adjust the insulation hood to provide isolation. The insulation hood of the present 5 invention shall be used on single termination as shown on Figure 6 or on three terminations as shown in Figure 4. The insulation hood according to the present invention may alternatively be mounted on switchgear with the inner hood and the outer hood may be adjusted for providing insulation. Preferably, the insulation hood may be made of an insulating material. 6 WE CALIM 1. An adjustable insulation hood for electrical termination, comprising: an outer hood with a slit and having a barrier; an inner hood with a slit and having a shield; and a locking means passing through the concentrical slits of the inner and outer hood lockably engaging the inner hood and the outer hood, wherein the adjustable insulation hood with the inner hood and the outer hood provided on a lug barrel, whereby the inner hood having the shield provides isolation between terminals of the lug barrel and the outer hood cover the projected length of the lug barrel. The adjustable insulation hood as claimed in claim 1, wherein a screw lockably engages the concentrical slits of the inner and outer hood to lockably engage the inner hood and the outer hood. 3. The adjustable insulation hood as claimed in claim 1. wherein the inner hood lockably extends to the length the lug barrel to provide isolation of 4. The adjustable insulation hood as claimed in claim 1, wherein a hole on the outer hood incorporates a screw for mounting onto a switchgear. 5. The adjustable insulation hood as claimed in claim 1, wherein the hood is adjusted after mounting on the switchgear. 6. The adjustable insulation hood as claimed in claim 1, wherein the lug barrel is a aluminum barrel. 7. The adjustable insulation hood as claimed in claim 1, wherein the lug barrel is a copper barrel. 8. The adjustable insulation hood as claimed in claim 1, wherein the hood provides isolation for single termination. 7 9. The adjustable insulation hood as claimed in claim 1, wherein the hood provides isolation for three terminations. 10.The adjustable insulation hood as claimed in any of the preceding claims is made of isolation material. Dated this 9th day of February, 2004 FOR LARSEN & TOUBRO LIMITED 8

Documents:

141-mum-2004-abstract(29-08-2007).doc

141-mum-2004-abstract(29-08-2007).pdf

141-mum-2004-cancelled pages(29-08-2007).pdf

141-mum-2004-claims(granted)-(07-12-2004).doc

141-mum-2004-claims(granted)-(07-12-2004).pdf

141-mum-2004-correspondence(29-08-2007).pdf

141-mum-2004-correspondence(ipo)-(13-10-2006).pdf

141-mum-2004-drawing(07-12-2004).pdf

141-mum-2004-form 1(09-02-2004).pdf

141-mum-2004-form 19(08-12-2004).pdf

141-mum-2004-form 2(granted)-(07-12-2004).doc

141-mum-2004-form 2(granted)-(07-12-2004).pdf

141-mum-2004-form 3(09-02-2004).pdf

141-mum-2004-form 5(07-12-2004).pdf

141-mum-2004-form 5(09-02-2004).pdf

141-mum-2004-power of attorney(09-02-2004).pdf

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