Protective Relays Their Theory Design And Practical Operation
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111. Two-phase groupings of current transformers showing connections and vectors.
INSTRUMENT TRANSFORMERS AND GROUPINGS 119 ing that the transformers have standard 5-amp. Secondary windings, the numbers on the vector diagrams show the currents in the corresponding branches of the circuits. The preferable arrangement for any case depends on the type of instrument to be energized. For ammeters, a reading in each phase usually is all that is necessary, while protective relays should be so connecte...d that trouble on any line will be detected.
NECESSITY FOR THREE TRANSFORMERS ON THREE-PHASE CIRCUITS That the use of two transformers and two relays for the pro- tection of a three-phase circuit is not sufficient is apparent from Fig. 1 12, which shows the relays at A and B with the transformers \ FIG. 112. Showing why two series transformers are not sufficient for three.
phase protection.
at 1 and 2. If a ground should occur on line 2, and another ground on a generator winding or lead as at a or b or c, then I Z 3 FIG.
What to read after Protective Relays Their Theory Design And Practical Operation?
You can find similar books in the "Read Also" column, or choose other free books by Victor H Todd to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
111. Two-phase groupings of current transformers showing connections and vectors.
INSTRUMENT TRANSFORMERS AND GROUPINGS 119 ing that the transformers have standard 5-amp. Secondary windings, the numbers on the vector diagrams show the currents in the corresponding branches of the circuits. The preferable arrangement for any case depends on the type of instrument to be energized. For ammeters, a reading in each phase usually is all that is necessary, while protective relays should be so connecte...d that trouble on any line will be detected.
NECESSITY FOR THREE TRANSFORMERS ON THREE-PHASE CIRCUITS That the use of two transformers and two relays for the pro- tection of a three-phase circuit is not sufficient is apparent from Fig. 1 12, which shows the relays at A and B with the transformers \ FIG. 112. Showing why two series transformers are not sufficient for three.
phase protection.
at 1 and 2. If a ground should occur on line 2, and another ground on a generator winding or lead as at a or b or c, then I Z 3 FIG.
What to read after Protective Relays Their Theory Design And Practical Operation?
You can find similar books in the "Read Also" column, or choose other free books by Victor H Todd to read onlineMoreLess
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