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US 12,308,637 B2Granted
Current sinking arrangement
AssigneeGridon Ltd.
InventorsVladimir Rozenshtein, Dvir Landwer, Uri Gabri
Life of this patent
Estimating the term…
Abstract
A current sinking arrangement is provided that comprises a current sinking arrangement for connection to three phases of an AC grid, operable for reduction of short circuit fault currents in the AC grid, the current diverting arrangement comprising first, second and third phase arrangements, each including first and second grid terminals and a current diversion branch having a first impedance and a first switch and connected to a common floating conductor. On reception of a signal indicating a fault, which requires fault current reduction, a switching arrangement is arranged to make the first switches conducting so as to divert a portion of the fault current away from the AC grid fault location to the common floating conductor.
Claims20
A current sinking arrangement for connection to three phases of an AC grid, operable for reduction of short circuit currents in the AC grid, the current diverting arrangement comprising:
- a first phase arrangement including:
- a first grid terminal connectable to a node of a first phase of the three phase AC grid and a second grid terminal connectable to another node of the first phase of the three phase AC grid, the first phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end connected to a second node, the current diversion branch comprising a first impedance connected in series between the first end and the second end, and a first switch connected in series between the first end and the second end, and wherein the first switch is not conducting in a first state and is conducting in a second state;
- a second phase arrangement including:
- a first grid terminal connectable to a node of a second phase of the three phase AC grid and a second grid terminal connectable to another node of the second phase of the three phase AC grid, the second phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end connected to a second node, the current diversion branch comprising a first impedance connected in series between the first end and the second end, and a first switch connected in series between the first end and the second end, and wherein the first switch is not conducting in the first state and conducting in the second state;
- a third phase arrangement including:
- a first grid terminal connectable to a node of a third phase of the three phase AC grid and a second grid terminal connectable to another node of the third phase of the three phase AC grid, the third phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end connected to a second node, the current diversion branch comprising a first impedance connected in series between the first end and the second end, and a first switch connected in series between the first end and the second end, and wherein the first switch is not conducting in the first state and conducting in the second state;
- a switching arrangement arranged to control the first switch of the first phase arrangement, the first switch of the second phase arrangement, and the first switch of the third phase arrangement;
- wherein the second nodes of the first phase arrangement, the second phase arrangement, and the third phase arrangement are all connected to a common floating conductor;
- wherein the first state represents normal conditions on the AC grid and the second state represents a fault condition on the AC grid;
- wherein, on reception of a signal indicating the second state, the switching arrangement is arranged to make the first switch of the first phase arrangement, the first switch of the second phase arrangement, and the first switch of the third phase arrangement conducting;
- wherein, when the first switches are in the second state, the current diversion branches are arranged to divert a portion of the fault current away from the AC grid fault location to the common floating conductor.
11 more elements
A single phase current sinking arrangement comprising:
- a grid terminal connectable to a node of a single phase of an AC grid and a second grid terminal connectable to another node of the single phase of the AC grid,
- a current diversion branch having a first end connected to a first node between the first grid terminal and the second grid terminal, and a second end connected to ground, the current diversion branch comprising:
- a first impedance connected in series between the first end and the second end,
- a first switch connected in series between the first end and the second end, and wherein the first switch is open in a first state and closed in a second state;
- a bypass arrangement connected in series between the first end and the second end, the bypass arrangement comprising a bypass impedance connected in series between the first end and the second end, and a bypass branch connected in parallel with the bypass impedance, the bypass branch comprising a second switch, wherein when the second switch is closed the bypass impedance is electrically bypassed;
- a switching arrangement arranged to control the first switch and the second switch;
- wherein the first state represents normal conditions on the AC grid and the second state represents a fault condition on the AC grid;
- wherein, on reception of a signal indicating the second state, the switching arrangement is arranged to make the first switch conducting, wherein, when the first switch is in the second state, the current diversion branch is arranged to divert current away from the AC grid to ground;
- wherein, on reception of the signal indicating the second state, the switching mechanism is further arranged to selectively make the second switch conducting or non-conducting so as to vary an amount of current diverted away from the AC grid in the second state.
6 more elements
A current sinking arrangement for connection to three phases of an AC grid, operable for reduction of short circuit currents in the AC grid, the current diverting arrangement comprising:
- a first phase arrangement including:
- a first grid terminal connectable to a node of a first phase of the three phase AC grid and a second grid terminal connectable to another node of the first phase of the three phase AC grid, the first phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end, the current diversion branch comprising first switch connected in series between the first end and the second end, and wherein the first switch is not conducting in a first state and is conducting in a second state;
- a second phase arrangement including:
- a first grid terminal connectable to a node of a second phase of the three phase AC grid and a second grid terminal connectable to another node of the second phase of the three phase AC grid, the second phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end, the current diversion branch comprising first switch connected in series between the first end and the second end, and wherein the first switch is not conducting in the first state and conducting in the second state;
- a third phase arrangement including:
- a first grid terminal connectable to a node of a third phase of the three phase AC grid and a second grid terminal connectable to another node of the third phase of the three phase AC grid, the third phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end, the current diversion branch comprising a first switch connected in series between the first end and the second end, and wherein the first switch is not conducting in the first state and conducting in the second state;
- a switching arrangement arranged to control the first switch of the first phase arrangement, the first switch of the second phase arrangement, and the first switch of the third phase arrangement;
- wherein the second ends of the first phase arrangement, the second phase arrangement, and the third phase arrangement are all connected to a three phase delta connected floating impedance arrangement;
- wherein the first state represents normal conditions on the AC grid and the second state represents a fault condition on the AC grid;
- wherein, on reception of a signal indicating the second state, the switching arrangement is arranged to make the first switch of the first phase arrangement, the first switch of the second phase arrangement, and the first switch of the third phase arrangement conducting;
- wherein, when the first switches are in the second state, the current diversion branches are arranged to divert a portion of the fault current away from the AC grid fault location to the three phase delta connected floating impedance arrangement.
11 more elements
A current sinking arrangement for connection to three phases of an AC grid, operable for reduction of short circuit currents in the AC grid, the current diverting arrangement comprising:
- a first phase arrangement including:
- a first grid terminal connectable to a node of a first phase of the three phase AC grid and a second grid terminal connectable to another node of the first phase of the three phase AC grid, the first phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end connected to a second node, the current diversion branch comprising a first impedance connected in series between the first end and the second end;
- a second phase arrangement including:
- a first grid terminal connectable to a node of a second phase of the three phase AC grid and a second grid terminal connectable to another node of the second phase of the three phase AC grid, the second phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end connected to a second node, the current diversion branch comprising a first impedance connected in series between the first end and the second end;
- a third phase arrangement including:
- a first grid terminal connectable to a node of a third phase of the three phase AC grid and a second grid terminal connectable to another node of the third phase of the three phase AC grid, the third phase arrangement having a first node between the first grid terminal and the second grid terminal;
- a current diversion branch having a first end connected to the first node and a second end connected to a second node, the current diversion branch comprising a first impedance connected in series between the first end and the second end;
- wherein the second nodes of the first phase arrangement, the second phase arrangement, and the third phase arrangement are all connected to a three phase delta-connected set of switches, configured to be non-conducting in a first state and conducting in a second state;
- a switching arrangement arranged to control the three phase delta-connected set of switches;
- wherein the first state represents normal conditions on the AC grid and the second state represents a fault condition on the AC grid;
- wherein, on reception of a signal indicating the second state, the switching arrangement is arranged to make the 3-phase delta-connected set of switches conducting;
- wherein, when the three phase delta-connected set of switches is conducting, the current diversion branches are arranged to divert a portion of the fault current away from the AC grid fault location to the three phase delta-connected set of switches.
11 more elements
Dependencies are inferred from the claim text.