Abstract:
The actuator (2) can be used to apply fluids to the web of a papermaking machine. The actuator comprises a housing (4) having a first inlet (16) connectable to the fluid source and a second inlet (10) connectable to a pressure source. A resilient bellows structure (30) extends between the first and second inlets within the housing to define an internal region of the bellows structure in sealed communication with one of the first and second inlets and an external region of the bellows structure in sealed communication with the other inlet. A valve member (50) adapted to move with the bellows structure is provided to open and close the first inlet to vary the flow of fluid from the fluid source and maintain a pressure related to a balance of forces of the bellows structures. An outlet (58) from the housing in communication with the first inlet permits the exit of the flow of fluid to a flow controlling orifice. A pneumatic control signal provided to the second inlet controls expansion or contraction of the bellows structure.
Abstract:
Systems and methods for fault detection and protection in electric power systems that evaluates electromagnetic transients caused by faults. A fault can be detected using sampled data from a first monitored point in the power system. Detection of fault transients and associated characteristics, including transient direction, can also be extracted through evaluation of sample data from other monitored points in the power system. A monitoring device can evaluate whether to trip a switching device in response to the detection of the fault and based on confirmation of an indication of detection of fault transients at the other monitored points of the power system. The determination of whether to trip or activate the switching device can also be based on other factors, including the timing of receipt of an indication of the detection of the fault transients and/or an evaluation of the characteristics of the detected transients.
Abstract:
A system for monitoring and controlling a batch process. The system includes a control system that is operable to control the batch process and to receive measured process variables of the batch process. An analyzer analyzes a material sample from the batch process and generates array data representative of the composition of the material sample. An analyzer controller is operable to collect the array data from the analyzer and the measured process variables from the control system. A software data server running on a computer is operable to retrieve the array data and the measured process variables from the analyzer controller. A software information management system running on the computer is operable to receive the measured process variables and the array data from the data server and to store the measured process variables and the array data in a database in an associated manner.
Abstract:
A system and method for configuring devices on a device network in communication with a router on a control network. An unconfigured device installed on the network receives a poll at a predetermined address from a router. The router receives a response to the poll from the unconfigured device, and requests identification of devices having a range of device object IDs and stores the MAC addresses of responding devices and the device object IDs. The unconfigured device is configured to have the proposed MAC address and device object ID.
Abstract:
A system and method for developing, deploying and implementing computer applications for a power system has an open software framework for developing mobile applications. The mobile applications are developed by combining predefined modules having functionality to monitor a power system, change configuration settings within devices installed on the power system and allow utility personnel to quickly respond to events occurring on the power system.
Abstract:
An apparatus to detect and measure suspended particles in a molten metal where the suspended particles have an associated noise frequency range has in addition to the electrically non-conductive barrier for immersion in the molten-metal, a device to move the molten metal through an orifice in the barrier and electrodes, a time varying excitation source that generates an AC current at a predetermined range of excitation frequency that is out of the predominant noise frequency range to generate an AC signal that is representative of the measure of the suspended particles. A detector detects and quantifies from the measurement AC signal the suspended particles. The detector can be a synchronous detector.
Abstract:
A current sensor (70) is provided for measuring DC current (Ι^) in a primary conductor (40) also carrying AC current (lac). The current sensor includes a ferromagnetic core (50) through which the primary conductor may extend. The core has a narrow air gap (56) formed there in and a magnetic flux sensor (58) is disposed in the air gap. A secondary winding (60) is mounted to the core and has an impedance (72) connected therein. The impedance has a value of substantially zero at one or more frequencies of the AC current. The impedance may be a short or an impedance source that includes a capacitor (76) and an inductor (74).
Abstract:
A system for the detection of welded contacts in a circuit of a line converter system has a plurality of inverter switches, a plurality of utility switches in which a pair of utility switches is connected in series through a line to a utility, a voltage detector, an electronic controller, and a DC input source. The line converter system converts incoming DC power into AC output power that is delivered to the utility grid. The voltage detector measures the voltage across a first node and a second node of the circuit and provides an output that is interpreted by an electronic controller for each step performed during a method of detection of welded contacts. The detection method has a sequence of test steps in which at least one switch is opened and/or closed, a DC bus of the inverter or the utility grid is used as a stimulus voltage, and the voltage is measured. If a voltage is not detected across the first and second nodes, the test sequence is continued until a welded contact is detected or the electronic controller determines that none of the contacts are welded. If the controller determines that none of the contacts are welded, the line converter system is permitted to connect and supply AC power to the utility.