Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
  • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
  • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
  • H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters

Definitions

• This invention relates to a device for arresting any surge or overload which may be applied to a telecommunicati system, its lines and equipment, to prevent damage to areas of the system.
• the invention consists of a surge protection device for a telecommunication system, said device being capable of location in said system between an area where surge initiati may occur and an element of said system, characterized by a gas arrestor situated in said device such that when said dev
• OMPI is located in said system, said gas arrestor is connected to a line of said system along which said surge may be propagated.
• Fig. 1 is a side elevation of a first embodiment of a surge protection device according to the invention.
• Fig. 2 is a side elevation of a second embodiment of a surge protection device according to the invention.
• the device is in the for of a component 10 which is capable of being inserted into a telephone line between a Telecom Australia standard telepho socket and a Telecom Australia standard telephone plug, the latter of which is used to connect a telephone to the telep system.
• a component 10 which is capable of being inserted into a telephone line between a Telecom Australia standard telepho socket and a Telecom Australia standard telephone plug, the latter of which is used to connect a telephone to the telep system.
• the component 10 would be design to fit the standard plugs and sockets of those systems, or be located permanently in a line of said systems.
• the component 10 includes a plug section 12 which has three pins 14, 16, 18 and an apertured projection 20 which are adapted to be pushed into a Telecom Australia standard telephone socket, a socket section 22, which has three sock 24, 26, 28 which are adapted to receive the pin of a Teleco Australia standard telephone plug.
• the component has a casing 30 which preferably is for from the same type of plastics material used in the standar plug and socket referred to hereinbefore. Within the casin there is an electrical connection 32 between pin 14 and soc 28, and another connection 34 between pin 18 and socket 24.
• the device 10 is shown with only two electrical connections but of course three or more wires are sometimes utilized, and this invetion is of course not limited to the arrangeme shown in Fig. 1.
• gas arrestor 36 Connected between connections 32 and 34 (or between sockets 24 and 28, or pins 14 and 18, or connected between sets of connections for numbers greater than two) is a gas arrestor 36.
• Gas arres ors are known per se; they act to "deflect" or *fiivert" voltages over a pre-set value.
• telephones are often operated on a voltage of 50V and therefore a gas arrestor could be used, in a telephone system of that type, with a pre-set voltage of, say, 75V. As long as the maximum instantaneous voltage remained below 75V, the gas arrestor would not be active in the circuit an the article of telephone equipment would function normally.
• gas arrestor 36 would come into operation to "deflect" the voltage back through the lines, thereby isolating the article (and any person in close proximity to it) from the surge.
• the preferred gas arrestor 36 for the embodiment of F 1 is a Siemens T61-350.
• the third connector of the arresto may be connected to earth, as descirbed hereinafter in rela to the embodiment of Fig. 2.
• the advantage of the device of this invention is that component 10 can be bought "off the shelf" and easily inter between a telephone plug and a telephone socket. Alternati the arrangement can be fitted more permanently in a fixed position within a system, in a telephone itself in a junctio or elsewhere in the telephone lines or system. It may well be that a severe lightning surge will dest components of the device, but such a device can be replaced more cheaply than an article of telephone equipment, and of course its destruction may have saved a life or at the very least, injury to a person. It has been suggested that the first embodiment of the invention described in relation to Fig. 1, may not protect a end user of a telephone or the like in the extremely rare situation when a voltage surge occurs on both or all incomin lines. In such a situation it may not be possible to divert the surge along the other line.
• FIG. 2 The embodiment of Fig. 2 is designed to overcome this very unlikely scenario.
• reference numerals 10 to 30 relate to the features denoted by the same referenc numerals in Fig. 1.
• sockets 24, 26 and 28 are shown a connected to pins 18, 16 and 14, by conductors.38, 40 and 4 Connected to conductor 38 is a first gas arrestor 44 , and connected to conductor 42 is a second gas arrestor 46.
• the two gas arrestors are connected together by a conductor 48, to which is connected a conductor.50 to earth. in use, the conductor 50 would be connected to a dome commercial or other earth system.
• the unit would be sold with the earth lead 50 attached to the earth of an electrical plug, for example the standard Australian three-pin power plug, so that the device could be connected to earth merely by plugging the plug into a power point.
• a single Siemens T61-350 gas arrestor could be used across conductors 38, 42.
• the third, central connector of the gas arrestor is connected to earth lead 50.

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• Emergency Protection Circuit Devices (AREA)

Applications Claiming Priority (4)

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• 1984
  • 1984-07-09 EP EP19840902689 patent/EP0148911A4/de not_active Withdrawn
  • 1984-07-09 WO PCT/AU1984/000129 patent/WO1985000473A1/en not_active Application Discontinuation

Patent Citations (4)

Non-Patent Citations (1)

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