Abstract:
A wireless network managing device for a wireless network that is part of a process control system. The wireless network managing device includes a node determination element configured to receive an operator selection of at least one node in the process control system via an operator terminal and determine a field device implementing the functionality of the node, and a bandwidth control element configured to adjust a bandwidth assigned to the at least one field device in an auxiliary data section of a communication structure used by the wireless network based on the received operator selection in order to increase system responsiveness.
Abstract:
A device for controlling an electric field at a high voltage component includes an inner deflector electrically connected to live voltage component; a resistive layer adapted for field control, arranged along the high voltage component, and electrically connected to the live high voltage component and electrically connected to a grounded part, the resistive layer having a nonlinear current-voltage characteristics; an insulating layer extending but ending without reaching the end of the resistive layer; and a semi-conducting or conducting layer arranged on the insulating layer and extending towards the resistive layer and past the end of the insulating layer, thereby defining an outer triple point at the intersection of the resistive layer, the insulating layer, and the semi-conducting or conducting layer. The resistive layer has first, second, and third adjacent sections, wherein a portion of the first section extends below the inner deflector.
Abstract:
A fiber-optic current sensor uses a highly-birefringent spun fiber as sensing fiber. The light is fed through a retarder, which is a detuned quarter-wave or half-wave retarder. It is shown that such detuning can be used to compensate for temperature dependencies of the sensing head.
Abstract:
A method for monitoring an industrial process with a graphical user interface of an operator panel. The graphical user interface is adapted to change between a default mode in which it presents a plurality of objects related to the industrial process, and a user-adapted mode in which a subset of the plurality of objects is presented. The subset of objects is selected based on a parameter value which is associated with each object of the plurality of objects. The graphical user interface enters the user-adapted mode by the method determining whether a time of inactivity of the operator panel exceeds a threshold value, and, provided that the threshold value has been exceeded, removing those objects of the plurality of objects on the graphical user interface which are not included in the subset of objects.
Abstract:
A network management agent, device or module determine the network topology of a communication network based on at least one neighbor network or end device identity and corresponding network link communication delay collected from, determined by, and stored in a Management Information Base of, at least one first network device of the communication network. Neighbor identities and communication delays are determined according to the IEEE 1588 standard.
Abstract:
A programmable logic controller for an industrial control system is disclosed which includes an application logic execution layer and at least one of an update checking layer and an output checking layer. The application logic layer is configured for processing sensor input data to generate an output parameter for an actuator. The output checking layer is configured for outputting only an allowed output parameter to the actuator. The update checking layer is configured for verifying whether application logic update defined by application logic update data corresponds to an application logic update in a list of allowed logic updates, and the application logic is updated only if the update data is allowed application logic update data.
Abstract:
An exemplary gate drive circuit and method are disclosed for controlling a gate-controlled component, the gate drive circuit having a PI controller adapted to receive an input reference signal and to control a gate voltage of the gate-controlled component. The gate drive circuit can include a first feedback loop for the PI controller, the first feedback loop having a first gain (kv), a second feedback loop for the PI controller, the second feedback loop having a second gain (ki), and a clipping circuit adapted to modify a feedback signal in the second feedback loop during turn-on of the gate-controlled component when the time derivative of the collector current is negative. The first feedback loop can include a first blanking circuit adapted to cut the feedback loop when the gate-controlled component is in a blocking state.
Abstract:
A cooling apparatus for electric equipment includes a generator configured to receive a heat load from first electric components, a evaporator configured to receive a heat load from second electric components, a closed compartment enclosing the generator and evaporator, and a absorber transferring heat from heated fluid to the outside of the closed compartment. To obtain an efficient and reliable cooling apparatus, the cooling apparatus includes a first expansion device which reduces the pressure of the fluid, and forwards the fluid in a liquid state and with a lower pressure to the secondary cooling element, which transfers heat to the received fluid from the second electric components for evaporating the fluid.
Abstract:
An apparatus is disclosed which includes a generator receiving a heat load from first electric components, an evaporator for receiving a heat load from second electric components, a tight enclosure, and an absorber-condenser arranged outside of the tight enclosure. For efficient cooling of the apparatus, one or more of the generator, evaporator and absorber-condenser is entirely or partly manufactured of aluminum. The inert and refrigerant can be selected such that R134a is used as the inert and butane as the refrigerant fluid, or R32 is used as the inert and cyclopropane is used as the refrigerant, and the absorber is selected to include an alkyl acetamide, a carbonate ester or a glycol ester.
Abstract:
A reverse osmosis separation process is disclosed, such as for desalination and waste water reuse process, wherein an effectiveness of membrane cleaning can be estimated. Exemplary embodiments operate the reverse osmosis membrane cleaning process for a controlled time for cleaning and with a controlled value of chemical concentration in a chemical liquor prepared for cleaning the membrane. A method can include estimating fouling status of the membrane and determining a controlled value of chemical concentration in the chemical liquor, and a controlled time for cleaning based on the fouling status of the membrane.