An electrical system for connecting rotary electric machines (111, 113) with gas turbine spools, further comprising: a first rotary electric machine mechanically coupled with a first gas turbine spool and a second rotary electric machine mechanically coupled with a second gas turbine spool; a first set of bidirectional converter circuits for conversion of alternating current (ac) to and from direct current (dc), each converter circuit having an ac side and a dc side, the ac side of each converter circuit of the first set being connected with the first rotary electric machine; a second set of bidirectional converter circuits for conversion of ac to and from dc, each converter circuit having an ac side and a dc side, the ac side of, the ac side of each converter circuit of the second set being connected with the second rotary electric machine; and an R-channel electrical network, characterized in that: each of the first and second electric machines (111, 113) has an identical even number N ≥ 4 of phases, each phase having a respective index n = (1,...,N), and each phase comprising an identical number P ≥ 1 of coils wound in a configuration in which adjacent phases are radially separated by 2π/NP mechanical radians; the first set of bi-directional converter circuit is a set of N bi-directional converter circuits, and each converter circuit has a respective index n and is connected at its ac side with the P coils in the nth phase of the first rotary electric machine; the second set of bi-directional converter circuit is a set of N bi-directional converter circuits, and each converter circuit has a respective index n and is connected at its ac side with the P coils in the nth phase of the second rotary electric machine; and the system further comprises a switching arrangement having a number R of dc outputs for connection with the R-channel electrical network, wherein each dc output has respective index r = (1,..., R), wherein R satisfies 1 ≤ R ≤ N/ 2 and wherein, for all r, the switching arrangement connects the rth dc output with the dc side of the nth converter circuits in both the first set and second set, for which n (mod R) ≡ r is satisfied. a first rotary electric machine mechanically coupled with a first gas turbine spool and a second rotary electric machine mechanically coupled with a second gas turbine spool; a first set of bidirectional converter circuits for conversion of alternating current (ac) to and from direct current (dc), each converter circuit having an ac side and a dc side, the ac side of each converter circuit of the first set being connected with the first rotary electric machine; a second set of bidirectional converter circuits for conversion of ac to and from dc, each converter circuit having an ac side and a dc side, the ac side of, the ac side of each converter circuit of the second set being connected with the second rotary electric machine; and an R-channel electrical network, characterized in that: each of the first and second electric machines (111, 113) has an identical even number N ≥ 4 of phases, each phase having a respective index n = (1,...,N), and each phase comprising an identical number P ≥ 1 of coils wound in a configuration in which adjacent phases are radially separated by 2π/NP mechanical radians; the first set of bi-directional converter circuit is a set of N bi-directional converter circuits, and each converter circuit has a respective index n and is connected at its ac side with the P coils in the nth phase of the first rotary electric machine; the second set of bi-directional converter circuit is a set of N bi-directional converter circuits, and each converter circuit has a respective index n and is connected at its ac side with the P coils in the nth phase of the second rotary electric machine; and the system further comprises a switching arrangement having a number R of dc outputs for connection with the R-channel electrical network, wherein each dc output has respective index r = (1,..., R), wherein R satisfies 1 ≤ R ≤ N/ 2 and wherein, for all r, the switching arrangement connects the rth dc output with the dc side of the nth converter circuits in both the first set and second set, for which n (mod R) ≡ r is satisfied. each of the first and second electric machines (111, 113) has an identical even number N ≥ 4 of phases, each phase having a respective index n = (1,...,N), and each phase comprising an identical number P ≥ 1 of coils wound in a configuration in which adjacent phases are radially separated by 2π/NP mechanical radians; the first set of bi-directional converter circuit is a set of N bi-directional converter circuits, and each converter circuit has a respective index n and is connected at its ac side with the P coils in the nth phase of the first rotary electric machine; the second set of bi-directional converter circuit is a set of N bi-directional converter circuits, and each converter circuit has a respective index n and is connected at its ac side with the P coils in the nth phase of the second rotary electric machine; and the system further comprises a switching arrangement having a number R of dc outputs for connection with the R-channel electrical network, wherein each dc output has respective index r = (1,..., R), wherein R satisfies 1 ≤ R ≤ N/ 2 and wherein, for all r, the switching arrangement connects the rth dc output with the dc side of the nth converter circuits in both the first set and second set, for which n (mod R) ≡ r is satisfied.