Abb Research Ltd.

Other

Abb Schweiz Ag

Marco Piemontesi

Christoph Heitz

Silvio Colombi

Gerhard Salge

Lutz Niemeyer

Yashomani Yashodhan Kolhatkar

Diego Sologuren-Sanchez

Lauro Strozzi

M N Lakshmi Prasad

Herbert Meinecke

Lakshmi Prasad

Yashomani Y Kolhatkar

A grid interactive uninterruptible power supply (UPS) is provided. The grid interactive UPS includes a first path including a rectifier, an inverter coupled in series with the rectifier, and a battery coupled in parallel with the inverter. The grid interactive UPS further includes a second path in parallel with the first path, wherein the grid interactive UPS is operable to supply power from the battery to a grid coupled to an input of the grid interactive UPS.

Systems and methods for grid interactive UPS

Systems and methods are provided for controlling an uninterruptible power supply (UPS) to transition between three- or higher-level operation and two-level operation in a neutral-point-clamped (NPC) inverter. In an example, a UPS system includes an NPC inverter and a controller. The NPC inverter may supply power to a load. The controller may control the inverter to operate in a three-level mode or higher when the load is substantially balanced and to operate in a two-level mode when the load is substantially unbalanced.

Intelligent level transition systems and methods for transformerless uninterruptible power supply

Support insulator

The invention relates to a post insulator ( ) whose surface ( ) is geometrically configured, in at least one area ( ) between an inner conductor ( ) and encapsulation ( ) for a gas-insulated switchgear assembly ( ) such that surface discharge paths ( ) are provided between the inner conductor ( ) and the encapsulation ( ) and have a subsection in the opposite direction to the bridging direction ( ). In consequence, surface discharges ( ) can be diverted in the opposite direction to an original propagation direction ( ), and come to rest by self-blocking. Exemplary embodiments relate to: an indentation ( ) which is concave and is open toward the inner conductor ( ) and/or toward the encapsulation ( ) and is formed between a cup shaped barrier ( ) and the base body ( ) of the post insulator ( ); diversion of surface discharges ( ) through up to 180&deg; for efficient self blocking; and adhesive bonding ( ) of the barrier ( ) on a conventional post insulator ( ). The invention also relates to a gas-insulated switchgear assembly ( ) or to a switchgear assembly module having such a post insulator ( ) or partition insulator ( ).

GIS post insulator with an integrated barrier

Disconnector

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Biasca, Switzerland

Marco Piemontesi