Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1984-09-26
1986-09-02
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200144C, 200147R, 200147B, H01H 3308
Patent
active
046097970
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention relates to arc splitter plates for use in arc chutes and more especially to arc splitter plates for use in cold cathode arc chutes.
According to the invention, there is provided an arc splitter plate characterised in having a pair of spaced parallel limbs merging into a block portion, the block portion including at an end region thereof remote from the pair of spaced parallel limbs an insulating means formed as a continuous strip of flexible material adhering to a surface of the block portion.
Embodiments of the invention will now be described by way of example, and with reference to the accompanying partially diagramatic drawings in which:
FIG. 1 is a plan view of an arc splitter plate;
FIG. 2 is a cross-sectional elevation of the arc splitter plate taken along the line 11--11 of FIG. 1, and
FIG. 3 is a part sectional elevation of a cold cathode arc chute including a number of arc splitter plates and circuit breaker.
With reference to FIGS. 1 and 2 of the drawings, an arc splitter plate 1 made of steel includes a pair of spaced-parallel limbs 2, 4 of rectangular cross section which merge together at one end into a block 6 of rectangular cross-section forming a notch 8, therebetween in one end portion of the block 6. Spaced along each limb 2, 4 and opposed edge regions of the block 6 are a series of aligning apertures 10. Toward another end portion of the block 6, remote from the notch 8, is an insulated region 12 which extends across a portion of the width of a first face 14 of the block 6 and extends over a leading edge 15 of the block 6 remote from the free ends of the pair of limbs 2, 4 to a second face 16 of the block 6, mutually opposed to the first face 14 of the block 6.
The insulated region 12 is formed from an insulating means 13 which comprises a tape 13 including combined layers of insulating material and adhesive, for example, a layer of polyimide insulating material and a layer of silicon adhesive.
The tape 13 is applied to the first and second faces 14, 16 of the block 6, prior to assembly of the arc splitter plate 1 into an arc chute. The tape 13 is applied from a dispenser containing a reel of tape 13 of appropriate width, the width of the tape 13 being in the range of 50 to 100 mm. The tape 13 including combined layers having a thicknes in the range of 0.05 to 0.5 mm of polyimide insulating material and silicon adhesive. The tape 13 is applied to the first face 14 of the block 6, which has previously been cleared to remove dirt and grease, drawn over the leading edge 15, and applied to the second face 16, which also has been previously cleaned to remove dirt and grease, to form the insulated region 12 of a length of, for example, 100 mm on faces 14, 16, leaving an exposed region of steel of, for example, 150 mm in length between the insulated region 12 and the notch 8 on opposed faces 14, 16 of the block 6. These dimensions varying in dependence upon the current being interrupted and the voltage rating of the arc chute.
With reference to FIG. 3, a number of such arc splitters plates 1 are then assembled into a cold cathode arc chute 18. The cold cathode arc chute 18 includes a pair of spaced supports 20, each support 20 supporting one of the limbs 2, 4 of each of the arc splitter plates by means of fixing elements (not shown) inserted through the apertures 10 in the arc splitter plates 1 such that the notches 8 of the arc splitter plates 1 form a tunnel between the supports 20. The arc splitter plates are arranged with spacers (not shown) made of insulating material so that a row of narrow arc extinguishing compartments 22 is produced each having an open top. A pair of runners 24 is positioned to extend along the tunnel, and vent spacer plates 26 are positioned above the open tops of the arc extinguishing compartments 22. The assembled arc chute 18 is then mounted on a circuit breaker 28 so that the pair of runners 24 engage with an arc initiating device 30 on the circuit breaker 28.
In operation, an arc initiated by the circuit breaker 28 is caused to propogat
REFERENCES:
patent: 2934629 (1960-04-01), Bonnefois et al.
patent: 3641294 (1972-02-01), Armitage et al.
patent: 4405847 (1983-09-01), Morton
Morton John S.
Parkinson James F.
Kemon Solon B.
Macon Robert S.
Whipp & Bourne Limited
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