US1206677A - Protective apparatus. - Google Patents

Description

%E. E. F. CREIGHTON.

PROTECTIVE APPARATUS.

APPLICATION FILED JUNE 10. 1914.

1,206,677. Patented Nov. 28, 1916.

Witnesses Inventor:

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9. w, w 8 fiZMM H is :yqttorn e 4O structed as to be a condenser 45 f re;

insulators distributed along the line an ab- UNITED STATES PATENT OFFICE.

ELIMIER E. F. CEEIGHTON, OF SCHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL -ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

PROTECTIVE APPARATUS.

Specification of Letters Yatent.

Application filed June 10, 1914. Serial No. 844,188.

oapparatus and more especially to an improved means for the protection of high tension systems of distribution and the apparatus connected thereto.

It is well known that in systems of this nature a condenser with resistance in series connected between two conductors or between the conductors and ground will absorb a large amount of energy from a wave of high frequency and steep wave front. It

is also known that waves of this nature are frequently set up on the line due to atmospheric disturbances, switching, resonance, etc. Little use, however,has been made of the protective effect of a condenser with resistance in series to relieve the line of such disturbances because of the expense of such an installation.

, In carrying my invention into effect, by

a small and comparatively inexpensive addition to the present standard line construction, I am able to secure the advantages of an absorber of the type mentioned and divert from the line a large amount of the energy of high frequency disturbances. The

35.most approved form of high tension transmission line construction calls for the use of several suspension disk-type porcelain insulators in series to support the conductor. Each of these insulator disks may be so conof appreciable capacity. At the present time, however,the resistance between the top disks of the series attached to the different conductors is practically negligible. In order, thereto make each one of these series of sorber I introduce a. resistance in series with each serles of insulators.

In the accompanying drawing I have '50 illustrated diagrammatically a suitable way in which my invention may be carried into efi'ect. As here indicated, 1, 2, 3, 4 and 5 are disk insulators supporting the wire 6 from the arm 7 of a transmission line tower which according to approved methods of construction-is of metal and is grounded. An insulating joint 8 of low electrostatic capacity is placed between the insulators and the supporting arm 7. This insulating joint is shunted by a high resistance 9. By this means it will be seen that a connection comprising a condenser with resistance in series is provided between any two conductors of the transmission line or between any conductor and ground. An arrangement of this nature will not absorb any appreciable amount of energy of the low frequency line current but will absorb a large amount of energy from high frequency disturbances and afford a high degree of protection to the line.

As an alternative method of construction one ofthe insulator disks may be shunted as indicated by a high resistance 10. In this case, however, it will of course be necessary to provide an additional disk to secure the desired insulation for the line.

What I claim as new and desire to secure by Letters Patent of the United States, is,

1. Means for protecting a system of distribution from the effects of high frequency disturbances arisin therein, comprising disk insulators for insulating the line conductors of saidsystem from earth, said insulators having appreciable capacity so as to offer a much lower impedance to the flow of high frequencycurrents betweenthe l'ine conductors and earth currents of the normal frequency of the system and high resistances between said insulators and earth for absorbing the energy of high frequency disturbances occurring in the system.

2. Means for protecting asystem of distribution from the effects of high frequency disturbances arising therein "comprising earthed supports for the line conductors of said system, insulators for insulating said line conductors from said supports, said insulators having appreciable capacity so as to offer a much lower impedance to the flow of high frequency currents between the line conductors andearth than'to the flow of currents of the normal'frequency of the system and high resistances between said insulators and said supports for absorbing the energy of high frequency disturbances occurring in said system.

3. The

tribution of line conductor, a support than to the flow of combination in a system of dissulators for each conductor at each support for insulating said conductors from ground and from each other, said insulators having appreciable capacity so as to ofier a much lower impedance to the flow of high frequency currents than to the flow of currents of the normal frequency, and a high resistance in series with each series of disk insulators to absorb the energy of high frequency disturbances occurring in the system. In witness whereof, I have hereunto set my hand this 9th day of June, 1914:.

ELMER E. F. CREIGHTON. Witnesses:

BENJAMIN B. HULL, HELEN ()RFoRD.

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