ABB Ltd

About: ABB Ltd is a company organization based out in Zurich, Switzerland. It is known for research contribution in the topics: Voltage & Signal. The organization has 6222 authors who have published 6852 publications receiving 83994 citations.

Method and device for compensation of reactive power

Abstract: A device for compensation of the reactive power consumption of an industrial load (2), preferably an electric arc furnace or a plant for rolling of metallic materials, supplied from a three-phase (a, b, c) electric ac network (1), comprises a first compensation device (3) for controllable consumption of reactive power and a second compensation device (4) for generation of reactive power The first compensation device comprises an inductor (31) connected in series with a semiconductor connection (32) controllable in dependence on a control order (αref) supplied thereto Control equipment (7) is supplied with measured values of voltage (Ua, Ub, Uc) and current (Ia, Ib, Ic), respectively, at the load The control equipment comprises means (8) for determination of the instantaneous consumption of active (P(t)) and of reactive power (Q(t)) by the load, and a control device (9) which forms the control order to the first compensation device in dependence on the consumption of reactive power and active power by the load

Method and system for producing web pages matched to client properties

Abstract: The invention relates to a method and a system for automatically producing web pages (5), (6), (7) for client appliances (1), (2), (3) of different client type (A), (B), (C) and with different client properties, where the client appliances (1), (2), (3) communicate with a web server (4) using client requests (14), (16), (18) and server responses (15), (17), (19), and the web server (4) stores web pages (5), (6), (7). The web server (4) is used to store web components (24), (37), (38), (39), (40), (41), (42), (43), (44), (45), and the client requests (14), (16), (18) sent to the web server (4) are used to identify the client type (A), (B), (C) and the client properties of the client appliance (1), (2), (3). From these, a respective profile is read in or produced for the respective client appliances (1), (2), (3), and the properties of the client appliances (1), (2), (3) are ascertained from the profile. The web components (24), (37), (38), (39), (40), (41), (42), (43), (44), (45) are instantiated on the basis of the properties of the client appliances (1), (2), (3). The instantiated web components (24), (37), (38), (39), (40), (41), (42), (43), (44), (45) are used to produce representations of the requested web pages (5), (6), (7) and these are sent to the client.

HVDC transmission with a converter connected between an AC voltage and a DC link common to the converters

Abstract: An HVDC transmission has two converters (SR1, SR2). Each converter is connected between an alternating-voltage network (N1, N2) and a d.c. link (L1, L2) common to the converters. At least one converter is connected to its alternating-voltage network without the use of any full transformer, for example directly, or via an inductor or an autotransformer, or via series capacitors. The transmission has a mutual inductor (IB) which is arranged on the d.c. side of the converter and which has two windings (IB1, IB2) which are each connected to a respective one of the d.c. supply lines of the converter and are magnetically coupled to each other, the inductor being designed and connected so as to exhibit a high impedance to ground mode currents.

Asset monitor for fieldbus devices

Abstract: A software product and method of monitoring a field device in an enterprise having an industrial process. A subscription to the OPC DA server for diagnostic data from the field device is made and a subscription to an OPC AE server for event notifications from the OPC AE server is made. The subscription to the OPC AE server is activated, but the subscription to the OPC DA server is not activated. When an event notification is received from the OPC AE server, the subscription to the OPC DA server is activated. Diagnostic data from the field device is received and device health information from the diagnostic data is generated. The device health information is displayed on a viewing monitor. The subscription to the OPC DA server is then deactivated.

Arrangement for detecting winding shorts in the rotor winding of electrical machines

Abstract: An arrangement for detecting winding shorts in a rotor winding of an electrical machine having a drive shaft with a drive end directly connected to ground and a measuring element provided at the non-drive end of the drive shaft for recording the shaft voltage between the machine shaft and ground. The voltage measuring element produces an output corresponding to the shaft voltage, which is applied to an analysis unit. The analysis unit evaluates the even or fractional harmonic content of the shaft voltage and outputs an alarm signal in the event that the even or fractional harmonic content exceeds a predetermined value.