Combined mutual drainage reactor and grounding relay

Details Combined mutual drainage reactor and grounding relay Combined mutual drainage reactor and grounding relay

1976-02-24

1977-11-29

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361119, 361120, H02H 322

Patent

active

040608425

ABSTRACT:
A combination mutual drainage reactor and grounding relay for protection of a two-wire communication circuit comprising a pair of inductively coupled coils each having one end grounded and the other end connected to a corresponding communication line through one of a pair of magnetically operated, normally open S.P.S.T. gas-filled reed switches which are disposed in the common magnetic circuit of the two coils and which have predetermined voltage breakdown characteristics between their open contacts.
A voltage from one line to ground in excess of the breakdown voltage characteristic of the connected reed switch causes current flow across the open switch contacts and through one coil to ground. The voltage thus impressed across this coil produces an equal voltage across the other magnetically coupled coil, which, in turn, causes the other reed switch to conduct, thereby preventing abnormal line-to-line voltage and maintaining balanced line-to-ground voltages. When the overvoltage ceases, the reed switches become non-conductive and isolate the drainage reactor from the communication lines.
If the line overvoltage and the proportional currents flowing between the open contacts of the switches exceeds a predetermined value and/or persists for predetermined time, the magnetic force on the reed switches will close these switches while such current persists to protect the reed switches from open contact operation in excess of their rated capacity for such operation and to minimize erosion of the switch contacts while conducting current across open contacts.

REFERENCES:
patent: 1382795 (1921-06-01), McNeill
patent: 1785972 (1930-12-01), Osborne
patent: 1971146 (1934-08-01), Rovere et al.
patent: 3492532 (1970-01-01), Fayling
patent: 3858089 (1974-12-01), Poindexter
patent: 3959694 (1976-05-01), Walsh

Affiliated with

Also associated with

Rating

Combined mutual drainage reactor and grounding relay does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Combined mutual drainage reactor and grounding relay, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined mutual drainage reactor and grounding relay will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1635900