Abstract:
An arrangement for monitoring condition of a direct current voltage circuit, an arrangement comprising a first and a second supply pole for forming an operating voltage of the direct current circuit, a first fuse (7a) connected to the first supply pole,, which first fuse has a supply pole (7a1 ) and an output pole (7a2). A second fuse (7b) connected to the second supply pole, which second fuse has an input pole (7b1) and an output pole (7b2), means for forming one or several reference voltages (U REF a, U REF b, U REF c) means (3a,...,3h, 3m,...,3t) for forming a first measurement voltage (U 1a ,U 1b ,U 1c , U 1d ) between the output pole (7a2) of the first fuse and the supply pole (7b1) of the second fuse, means for forming a second measurement voltage (U 1a ,U 1b ,U 1c ,U 1d ) between the output pole of the second fuse and the supply pole of the first or the second fuse, means (4a, 4b, 4c) for comparing one or several reference voltages and measurement voltages to estimate the condition of the first and the second fuse, and means (6) for indicating the comparison result.
Abstract:
A switch assembly (1) for switching electric circuits comprises a contributory switch (3), a main switch (2), and a flexible element (4). The contributory switch (3) and the main switch (2) are connected electrically in series, the contributory switch (3) and the main switch (4) each comprise at least one movable contact and the flexible element is connected to one movable contact of the contributory switch, a first contact (5a), and one movable contact of the main switch, a second contact (6a).
Abstract:
The invention relates to a method and an arrangement for determining an end-of-life of an overvoltage protection element (2) by determining (101) a predefined voltage limit based on a nominal voltage, determining (102) a measuring voltage across switch components (5) of the switch arrangement in connection with a switch-off event, and determining (103) that the overvoltage protection element (2) has reached its end-of-life when the measuring voltage is equal to or lower than the predefined voltage limit.
Abstract:
An electric switch arrangement(4)and a method for coupling of an electric power source (2) with a load (3). The electric switch arrangement comprises at least one electric switch unit (5) to be coupled between the electric power source and the load,at least one crowbar circuit (6) to be coupled to an output of the electric switch unit in parallel with the load, and at least one control unit (7) configured to control the operation of the electric switch unit and the crowbar circuit. The control unit is configured to control the electric switch unit to a closed state to allow a current flow through the electric switch unit and to an open state to prevent a current flow through the electric switch unit. The control unit is configured to control the crowbar circuit to a closed state to allowa current flow through the crowbar circuit and to an open state to prevent a current flow through the crowbar circuit.
Abstract:
A semiconductor switch arrangement comprising for each current phase a first and a second semiconductor switch (2a, 2b), a first and a second diode (3a, 3b), means for measuring voltages from input and output lines of said semiconductor switch and means for measuring current (8) arranged in series with said semiconductor switch. Additionally, the arrangement comprises a control element (14) configured to switch on the semiconductor switch arrangement at zero-voltage point and to switch off the semiconductor switches at zero-current point.
Abstract:
An arrangement for monitoring condition of a direct current voltage circuit, an arrangement comprising a first and a second supply pole for forming an operating voltage of the direct current circuit, a first fuse (7a) connected to the first supply pole,, which first fuse has a supply pole (7a1 ) and an output pole (7a2). A second fuse (7b) connected to the second supply pole, which second fuse has an input pole (7b1) and an output pole (7b2), means for forming one or several reference voltages (U REF a, U REF b, U REF c) means (3a,...,3h, 3m,...,3t) for forming a first measurement voltage (U 1a ,U 1b ,U 1c , U 1d ) between the output pole (7a2) of the first fuse and the supply pole (7b1) of the second fuse, means for forming a second measurement voltage (U 1a ,U 1b ,U 1c ,U 1d ) between the output pole of the second fuse and the supply pole of the first or the second fuse, means (4a, 4b, 4c) for comparing one or several reference voltages and measurement voltages to estimate the condition of the first and the second fuse, and means (6) for indicating the comparison result.
Abstract:
A switch assembly (1) for switching electric circuits comprises a contributory switch (3), a main switch (2), and a flexible element (4). The contributory switch (3) and the main switch (2) are connected electrically in series, the contributory switch (3) and the main switch (4) each comprise at least one movable contact and the flexible element is connected to one movable contact of the contributory switch, a first contact (5a), and one movable contact of the main switch, a second contact (6a).
Abstract:
An electric switch arrangement(4)and a method for coupling of an electric power source (2) with a load (3). The electric switch arrangement comprises at least one electric switch unit (5) to be coupled between the electric power source and the load,at least one crowbar circuit (6) to be coupled to an output of the electric switch unit in parallel with the load, and at least one control unit (7) configured to control the operation of the electric switch unit and the crowbar circuit. The control unit is configured to control the electric switch unit to a closed state to allow a current flow through the electric switch unit and to an open state to prevent a current flow through the electric switch unit. The control unit is configured to control the crowbar circuit to a closed state to allowa current flow through the crowbar circuit and to an open state to prevent a current flow through the crowbar circuit.