Abstract: There is provided a pit initiation evaluation system or the like capable of predicting pit initiation effectively and at low cost. In a pit initiation evaluation system of an embodiment, a pit initiation evaluation unit creates and retains, based on a dry-wet alternate time data, a deposit impurity concentration data, and a pit initiation data on pitting corrosion initiated in each of a plurality of turbine stages when an operation is actually performed in the steam turbine, a pit initiation evaluation table presenting a relationship between a dry-wet alternate time, a deposit impurity concentration, and pit initiation. Further, the pit initiation evaluation unit is configured to evaluate, by using the pit initiation evaluation table, pitting corrosion to be initiated in each of the plurality of turbine stages in an operation planned for the steam turbine.

Abstract: The present invention provides an information provision system that provides a user with information for coping with a problem by using an information terminal having a camera and a display, wherein the information terminal includes at least one processor with a memory comprising instructions cause the at least one processor to at least: identify a problem area in a captured image obtained by the camera; and display, on the display, a plurality of procedure screens indicating contents of a procedure for coping with the identified problem area, in accordance with an answer from the user, the plurality of procedure screens include a first procedure screen on which a plurality of answer items selectable by the user are displayed.

Abstract: A terminal head, which is provided in a sheath type temperature sensor and is for connecting the sheath type temperature sensor and a cable, is structured such that, in order for replacement of the sheath type temperature sensor to be easily performed and in order to minimize the number of replacement parts, a terminal plate (2) of the terminal head (1) and the sheath type temperature sensor 3 are coupled using a pair of plug-in connectors (4, 5) and the coupling is held by a coupling nut (6). When replacing the sheath type temperature sensor (3), the leads (31) of the sheath type temperature sensor do not need to be detached from and attached to the terminal plate (2) at the replacement worksite, and the only replaced part other than the sheath type temperature sensor (3) is the one connector (5).

Abstract: A terminal head, which is provided in a sheath type temperature sensor and is for connecting the sheath type temperature sensor and a cable, is structured such that, in order for replacement of the sheath type temperature sensor to be easily performed and in order to minimize the number of replacement parts, a terminal plate (2) of the terminal head (1) and the sheath type temperature sensor 3 are coupled using a pair of plug-in connectors (4, 5) and the coupling is held by a coupling nut (6). When replacing the sheath type temperature sensor (3), the leads (31) of the sheath type temperature sensor do not need to be detached from and attached to the terminal plate (2) at the replacement worksite, and the only replaced part other than the sheath type temperature sensor (3) is the one connector (5).

Abstract: Clock signals are supplied, with a phase shift of 1/n cycles between adjacent clock signals. A data acquisition unit acquires serial data at a timing of each of the clock signals. A phase detection unit detects the phase of the transition edge of the serial data using n bits of data. An effective bit number determination unit determines the effective bit number, which is the number of bits to be acquired, based upon the phase of the transition edge of the serial data in the current data-bit acquisition step and the phase of the transition edge of the serial data in the previous data-bit acquisition step. A data-bit output unit outputs the effective bit number of the bits of data acquired at a timing of each clock signal having a predetermined phase relation with the transition edge of the serial data.

Abstract: Clock signals are supplied, with a phase shift of 1/n cycles between adjacent clock signals. A data acquisition unit acquires serial data at a timing of each of the clock signals. A phase detection unit detects the phase of the transition edge of the serial data using n bits of data. An effective bit number determination unit determines the effective bit number, which is the number of bits to be acquired, based upon the phase of the transition edge of the serial data in the current data-bit acquisition step and the phase of the transition edge of the serial data in the previous data-bit acquisition step. A data-bit output unit outputs the effective bit number of the bits of data acquired at a timing of each clock signal having a predetermined phase relation with the transition edge of the serial data.

Abstract: An analog front-end circuit transmits and receives data between a baseband circuit and a radio unit. An analog-to-digital converter converts an analog received signal output from the radio unit into a digital signal. An interpolator interpolates an output signal of the analog-to-digital converter by up-sampling the output. A ?? modulator performs a fourth-order ?? modulation on an output signal of the interpolator. A low-voltage differential signal transmitter converts an output signal of the ?? modulator into a low-voltage differential signal and transmits the converted signal to the baseband circuit via differential signal lines.

Abstract: A load management and control apparatus comprising a control unit in which system voltage and a power flow state are measured to make an arithmetic decision by using the resultant variations in voltage and reactive power so as to estimate system reactance, and the estimated system reactance is used to carry out control operation while establishing unique relationship between tap changing operation of the transformer and connection or disconnection of the reactive power supply unit in the receiving side sub-station so as to set voltage and power factor of the receiving side of power system in desired ranges, whereby in a receiving end side substation, it is possible to prevent frequent tap changing operation of the transformer, and adjust system voltage not only to reduce the voltage deviation but also to provide integrated and reasonable management of the reactive power.

Abstract: A ball joint includes a socket of synthetic resin having a through-hole that accommodates a ball, a hole into which a rod is inserted and which is formed at right-angles to the through-hole and an accommodation portion that communicates with the rod insertion hole, a ball stud, the ball of which is accommodated in the through-hole, a C-ring mounted in the socket through-hole to maintain the ball in place, a cap that closes the open end of the socket and has a holder portion that locates in the accommodation portion of the socket and which holds the end of the inserted rod.

Abstract: A semi-conductor bridge thyrister converter circuit for converting AC power into DC power with suppression of the higher harmonics generated by the circuit including a semi-conductor converter circuit, a control circuit, and instrument transformers for measuring the voltages and the currents at the source and the load side at a node. On the basis of the outputs of these transformers, the control circuit controls the control delay angle and the overlap angle of the thyristers of the semi-conductor converter circuit such that higher harmonics generated by the converter current are reduced to a minimum as seen from the power system side.

Abstract: A differential protective relay apparatus is switched over between a current differential mode and a voltage differential mode automatically by both even-order harmonic components of an imput applied to a differential circuit and a voltage across an impedance of the differential circuit, thereby to cover extensive fault modes while retaining high minimum pickup sensitivity, furthermore, devised against excessive fault voltages in the voltage differential mode, and, consequently, advantageous in insulation withstand capability.

Abstract: An apparatus for differential-protection of a bus bar having a plurality of terminals which includes a plurality of trunk lines, in which an impedance of a differential circuit connected in parallel to a current transformer provided in each of the terminals is changed depending on either a terminal voltage of this differential circuit, or another terminal voltage derived from a part of the impedances. Then, either a high impedance differential relay, or a low impedance differential relay is selectively available so as to confirmly detect a fault in the bus bar.

Abstract: A voltage-reactive power control apparatus provided together with VAR (volt-ampere reactive) supply equipment at principal points of the power system, such as load area substations. This voltage-reactive power control apparatus monitors the power-flow and load voltage at the load area. The apparatus quickly controls VAR supply equipment etc. upon detecting of voltage abnormalities, information that otherwise would be sent to the control point at a higher level station in the power system upon making decision to provide necessary countermeasures for wider range operation of the power system.