A discharge unit of an embodiment includes a drain pan, a discharge portion having an insulation property, a grounded drain piping, and a liquid separation part having an insulation property. The drain pan receives a liquid. The discharge portion is connected to the drain pan and drains the liquid remaining in the drain pan. The liquid separation part prevents the liquid from flowing continuously between the discharge portion and the drain piping.

The invention relates to a method and a modular holding and exchanging system (1) for medium or high voltage converters, preferably a modular multilevel converter, comprising a rack (2) for receiving at least two power modules (3) arranged on top of one another in receiving spaces (4), wherein the rack (2) has at least two pairs of vertical standing elements (5) and at least two carrier elements (6) connecting the vertical standing elements (5) in a longitudinal direction (10) of the rack (2) in a horizontal support plane (9), a lifting tool (7) that can be coupled with the rack (2), which lifting tool (7) comprises at least one, preferably at least two, rolling bodies (19) that can be adjusted between a rest position (13) and a support and/or service position (14) for temporarily raising and/or moving a power module (4), wherein the power modules (4) have support surfaces (16) projecting in a transverse direction (11) with respect to a housing width (15) for being supported on the carrier elements (6), and the carrier elements (6) have an upper side (17) provided for at least parts of the support surface (16) of the respective power module (4) to rest on, and are configured as a profile element such that every carrier element (6) has at least one, preferably at least two passages (18), each, that are spaced apart from one another in the longitudinal direction (10), for at least one rolling body (19) to pass through in the service position (14) of the lifting tool (7), and wherein the lifting tool (7) comprises a longitudinally extended profile body (21), preferably a hollow body, configured so as to be insertable into the profile element of the carrier element (6) in the rest position (13), in which profile body (21) a lever device (20) is formed for adjusting the at least one rolling body (19), preferably of the at least two rolling bodies (19), which are spaced apart from one another in the longitudinal direction (10), from the rest position (13) into the service position (14).

The present invention relates to a modular cooling apparatus for a high-voltage direct-current transmission system. A sub-module (10) according to the present invention comprises a power unit (12) in the front and a capacitor unit (13) in the rear, and a heat sink (30) for discharging heat generated from the interior is provided in an interior space (14) of a power unit housing (14) forming the exterior of the power unit (12). A coolant path (31) is provided in the interior of the heat sink (30). The entrance and exit of the coolant path (31) are located adjacent to the bottom surface of the interior space (14). Connecting couplers (20) for supplying coolant to the interior space (14) are provided on the sloped surface (16) on the bottom end of the front surface (15) of the power unit housing (14). The sloped surface (16) is formed so as to face the ground at an angle. On both side surfaces of the power unit housing (14) are pass-through parts (22), each of which is provided with a louver plate (24) having louvers (26) to allow air to circulate between the interior space (14) and the outside. As such, according to the present invention, heat is dissipated more effectively while damage to the sub-module (10) due to coolant leakage does not occur.

An electrical service interface system include a configurable device and inverter mounted to an equipment tower, wherein each of the configurable device and inverter include alignment devices configured to rollably mount the configurable device and inverter to corresponding guides mounted to a support pad, and to align the configurable device to the inverter, and the inverter to the equipment tower. In an installed configuration, the configurable device electrically and mechanically couples to the inverter via a DC connector and one or more mounting systems, and the inverter mechanically and electrically couples to the equipment tower via an AC connector and one or more mounting systems.

A shorting device for facilitating the grounding of a converter to which a plurality of sub modules is connected in series. The device includes: a moving rod (40) provided on a main frame (10) on which sub modules (S) are provided, and moving in the direction traversing the sub modules (S); and contactors (50) provided at the moving rod (40) to be electrically connected to each sub module outer casing (1) according to the movement of the moving rod (40). In addition, a connection means (C) electrically connects the contactor (50), the sub module outer casing (1), and another adjacent sub module outer casing (1) to enable simultaneous grounding thereof. This invention connects the sub module outer casings (1), which form the converter, through the operation of the shorting device to ground the sub modules (S).

An apparatus for installing a high and low voltage conversion circuit, a high and low voltage conversion system and a power source are described. The apparatus includes: a first housing made of an insulation material and a second housing made of a metallic material, each being provided with two openings at both ends respectively in same direction; first and second housings are fixed, and are in contact on at least part of surfaces thereof; a first cavity and a second cavity are formed in first and second housings for installing a high-voltage circuit and a low-voltage circuit respectively, a high voltage terminal connected with high-voltage circuit and a low voltage terminal connected with low-voltage circuit are inserted through one opening of first housing and one opening of second housing respectively.

A method for assembling a power supply module, wherein a plurality of spacers are positioned between planes of different electrical potential on at least a high voltage end of a printed circuit board (PCB). The plurality of spacers having an electric field of a creepage distance greater than 0.4 kV/mm and configured to mechanically support the PCB during assembly and curing of an encapsulant. The encapsulant being an insulating material configured to provide electrical and thermomechanical insulation to the power supply module.

An apparatus of sliding a submodule includes a sliding rail part installed on one side of a cabinet; a submodule capable of being entered into or withdrawn from the cabinet; and a sliding guide part installed at one side of the submodule and slidingly moved by the sliding rail part. The sliding rail part may include a rail body, first and second extending parts extending from opposite ends of the rail body, and first and second sliding rails connected to the first and second extending parts respectively and protruding toward the sliding guide part.

The present invention relates to a modular apparatus for a high-voltage direct-current transmission system. A sub-module (10), which is a modular apparatus, comprises according to the present invention a power unit (12) in the front and a capacitor unit (13) in the rear, and on the lower end of a front surface (14) of a power unit housing (14) forming the exterior of the power unit (12) is a sloped surface (15). The sloped surface (15) has a hexahederal shape created by removing the edge formed by the front surface (14) and the bottom surface of the power unit housing (14) and faces the ground at an angle. A display unit (16) is provided on the sloped surface (15) so that the status of the sub-module (10) can be easily checked by a worker from the ground on which a structure stands. A front panel (18) comprising the display unit (16) is provided on the sloped surface (15), wherein the front panel (18) is provided with a panel through-hole (18) to allow a configuration space (20) in the interior to be visible. A control board (22) is coupled to the front panel (18) by means of a connection block (23). The control board (22) is movably supported on either end thereof by support rails (26) provided on both inner side walls of the configuration space (20) so as to allow easy entry into the interior and exit to the outside of the power unit (12).

A converter valve includes a top shielding cover, a bottom shielding cover, at least two vertically stacked valve layers, and a maintenance platform. The top shielding cover is disposed at an upper portion of an uppermost valve layer. The bottom shielding cover is disposed at a lower portion of a lowermost valve layer. Each of the valve layers comprises two valve modules disposed side-by-side in a horizontal direction. The two valve modules are electrically connected via a busbar and mechanically connected via securing connectors. A lower valve layer is connected to an upper valve layer in a suspended manner. A body of the maintenance platform is located between horizontal planes on which two vertically adjacent valve layers are located, or between horizontal planes on which the lowermost valve layer and the bottom shielding cover are located.