Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1990-10-30
1992-09-22
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324115, G01R 120, G01R 1508
Patent
active
051500396
ABSTRACT:
A single-phase multi-ratio current transformer, having at least two different current ratio or output levels through the appropriate wiring of its output leads without any intervention of the main current circuit of the system, having a primary current conductor, a secondary circuit having at least two change-over output wires S.sub.2 and S.sub.3, respectively connected to two contacts and a main output terminal connected to a common contact. A plurality of corresponding plug-in configurational devices, each have at least one jumper wire positioned to the common contact to only one of the two contacts, in order to give the current transformer the current ratio or output level corresponding to the selected wire S.sub.2 or S.sub.3, each configurational device serving as a key corresponding to a single current ratio or output level, so that when one of the keys is secured to the main part of the transformer, in accordance with the selected ratio or level of the current rating of the line, only one position of the key fits on to the main part of the transformer. There can also be provided n current transformers housed in the same enclosure wherein each configurational device is common to the n phases having n jumpers fixed in a position to correspond to the same current ratio or output level for the n phases.
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patent: 3049645 (1962-08-01), Skirpan
patent: 3514694 (1970-05-01), Beachley
patent: 3957333 (1976-05-01), Kaminski
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