Patent ID: 9025297
Filing Date: 2015-05-05
Classification: H02H

Abstract:
1. A surge protection circuit in a three-phase four-wire circuit, the three-phase four-wire circuit consisting of an R-phase, an S-phase, a T-phase, a neutral phase, and an independent earthing wire, the surge protection circuit consisting of: a first three-phase three-wire surge module consisting of four terminals and surge absorbing elements disposed between the four terminals; a single-phase two-wire surge module consisting of three terminals and surge absorbing elements disposed between the three terminals; and a second three-phase three-wire surge module consisting of four terminals and surge absorbing elements disposed between the four terminals, wherein the earthing wire is assumed an E-phase, the neutral phase is assumed an N-phase, one phase among the R-phase, the S-phase, the T-phase, the N-phase, and the E-phase is assumed a first phase, one phase among the remaining four phases is assumed a second phase, one phase among the remaining three phases is assumed a third phase, one phase among the remaining two phases is assumed a fourth phase, and the one remaining phase is assumed a fifth phase, wherein the terminals of the first three-phase three-wire surge module are respectively coupled to the first phase, the second phase, the third phase, and the fifth phase, wherein the terminals of the single-phase two-wire surge module are respectively coupled to one phase among the first, second, and third phases, to the fourth phase, and to the fifth phase, and wherein the terminals of the second three-phase three-wire surge module are respectively coupled to two phases among the first, second, and third phases, to the fourth phase, and to the fifth phase, the two phases being not coupled to the single-phase two-wire surge module, wherein the first three-phase three-wire surge module, the single-phase two-wire surge module, and the second three-phase three-wire surge module are separated from each other.