Abstract:
The present invention relates to an encapsulated switchgear comprising a housing (4) defining an insulating space (6) and an electrical active part (8; 9, 11a, 11b, 11c) arranged in the insulating space (6), said insulating space (6) comprising an insulation medium.. The switchgear is characterized in that the insulation medium comprises a dielectric compound having a boiling point of above -25°C.
Abstract:
A medium or high voltage switch has a first set of contact elements (13a, 13b, 13c) and a second set of contact elements (14a, 14b, 14c). Each contact element consists of an insulating carrier (15) carrying conducting elements (16). In the closed state of the switch, the conducting elements (16) align to form one or more current paths between terminals (8, 9) of the switch along an axial direction (A). For opening the switch, the contact elements are mutually displaced by means of two drives (18, 19) along a direction (D) perpendicular to the axial direction (A) with the conducting elements (16) mounted onto the contact elements by means of springloaded pins (161,162).
Abstract:
Auxiliary power supply system for supplying electrical energy from a ground-potential regime (2) to a high-voltage regime (3), wherein a plurality of power transmission units are provided, wherein each of the power transmission units comprises: - a power converter (5, 6) for converting electrical power into a transmissible power at the ground-potential regime (2); - an electric power recovering means (8, 10) for generating electric power from the transmissible power at the high-voltage regime; and - a coupling means (7, 9) for coupling the power converter (5, 6) to the respective electric power recovering means (8, 10) to transmit the transmissible power over an electrical potential barrier to the electric power recovering means (8, 10).
Abstract:
An auxiliary power supply system comprises an electric power source (4) at ground potential (G), a power supply circuit (5) at high voltage potential (19), and at least a first and a second insulating transmission link. The first (2) and the second (3) insulating transmission links are based on differing energy transmission principles, with the first transmission link (2) making use of a contact-less transmission principle, and the second transmission link (4) being based on transmission of mechanical energy.
Abstract:
A medium or high voltage switch has a switching assembly (12) actuated by at least one drive (18, 19). The drive (18, 19) comprises a plunger (27) arranged between two Thomson coils (37, 38). The plunger (27) is located in a chamber (26), with vents extending through the wall (25) of the chamber (26) for controlling and in particular for damping the motion of the plunger (27).
Abstract:
A medium or high voltage switch (27) has a first set of contact elements (13a, 13b, 13c) and a second set of contact elements (14a, 14b, 14c). Each contact element consists of an insulating carrier (15) carrying conducting elements (16). In the closed current-carrying state of the switch, the conducting elements (16) align to form one or more current paths (34) between terminals (8, 9) of the switch (27) along an axial direction (A). For opening the switch (27), the contact elements (13a, 13b, 13c; 14a, 14b, 14c) are mutually displaced by means of two drives (18, 19) along a direction (D) perpendicular to the axial direction (A). The switching arrangement is arranged in a fluid-tight housing (1) in a gas of elevated pressure or in a liquid. The switch (27) has a high voltage withstand capability and fast switching times.
Abstract:
A high voltage DC circuit breaker comprises a semiconductor switching assembly (3) in series to a mechanical switch (4). When the semiconductor switching assembly (3) is switched off due to a current fault, the residual current (I R ) flowing through the arresters (9) of the assembly (3) is switched off by the mechanical switch (4). A capacitor (12) arranged parallel to mechanical switch (4) leads to passive resonance effects, which in turn induce current zero crossings in its arc. The current zero crossings allow to extinguish the arc reliably. The mechanical switch (4) can be an AC circuit breaker.
Abstract:
A medium or high voltage switch (27) has a first set of contact elements (13a, 13b, 13c) and a second set of contact elements (14a, 14b, 14c). Each contact element (13a, 13b, 13c; 14a, 14b, 14c) consists of an insulating carrier (15) carrying conducting elements (16). In the closed state of the switch (27), the conducting elements (16) align to form one or more current paths (34) between terminals (8, 9) of the switch (27) along an axial direction (A). For opening the switch (27), the contact elements are mutually displaced by means of one or two drives (18, 19) along a direction (D) perpendicular to the axial direction (A). The switching arrangement (12) is arranged in a fluid-tight housing (1) in a gas of elevated pressure or in a liquid. The switch (27) has a high voltage withstand capability and fast switching times.