摘要:
An inrush-current suppressing device includes: a residual-magnetic-flux calculating unit that calculates a residual magnetic flux in a reference phase of a three-phase transformer while assuming a maximum magnetic flux level generated at a time of applying a rated voltage as 1 PU based on a measurement result of a transformer-voltage measuring unit before and after opening a three-phase circuit breaker; a stationary-magnetic-flux calculating unit that calculates a stationary magnetic flux in the reference phase of the three-phase transformer with reference to the maximum magnetic flux level obtained as the 1 PU based on a measurement result of a power-supply-voltage measuring unit, in response to a closing command to the three-phase circuit breaker; and a control unit that actuates a switch of the three-phase circuit breaker corresponding to the reference phase at a timing when the stationary magnetic flux and the residual magnetic flux in the reference phase match each other.
摘要:
A residual magnetic flux measurement apparatus measures residual magnetic fluxes by using a transformer-voltage measurement means for measuring transformer voltages; a voltage delay means for delaying the measured signals; a DC-voltage-component calculation means for calculating DC voltage components from the latest transformer-voltage signals for a predetermined time period based on calculation-control signals; a voltage integration means for calculating voltage-integration signals by performing voltage integration of signals obtained after separating the DC voltage components from present transformer-voltage signals; a magnetic-flux DC-component calculation means for calculating magnetic-flux DC-components from the latest voltage-integration signals for a predetermined time period based on the calculation-control signals; a magnetic flux calculation means for obtaining magnetic flux signals in which the magnetic-flux DC-components are separated from present voltage-integration signals; and a control means for obtaining residual magnetic fluxes based on contact signals, an interruption mode, the transformer-voltage signals, and the magnetic flux signals.
摘要:
A sensor part is provided with a printed circuit board that is made of resin and formed with a pair of electrically conductive metal patterns. Each of the pair of electrically conductive metal patterns includes: a first pattern part connected to a pair of electrodes of a temperature sensor; a second pattern part connected to a pair of conductive wires; and a connection part making a connection between the first and second pattern parts. The connection between the pair of electrodes of the temperature sensor and the first pattern part or between the pair of conductive wires and the second pattern part is made with the use of Dotite or solder.
摘要:
A switchgear control apparatus includes main contacts for first to third phases, operating mechanisms for activating the main contacts for the respective phases, voltage sensors for detecting phase voltages of a three-phase power source, and a contact closing control circuit. The contact closing control circuit first outputs a contact closing signal to the first-phase operating mechanism to close the first-phase main contact corresponding to a central leg of a core of a three-phase reactor at a first-phase voltage peak, and then a contact closing signal to the second- and third-phase operating mechanisms to simultaneously close the second- and third-phase main contacts corresponding to two outer legs of the reactor core at a zero-voltage point of the first phase three-quarter cycle later than close of the main contact for the first phase.
摘要:
In a phase control switching device that controls a closing phase of a three-phase switching device connected between a power-supply-side transmission line and a compensation transmission line having a shunt reactor, a closing-phase control unit operates based on a closing command to the three-phase switching device, generates, for each phase, a closing phase in which the three-phase switching device is closed at zero points, both polarities of which are inverted into the same polarity, among zero points where zero points of a voltage changing ratio and zero points of the shunt reactor current coincide with each other, and controls the three-phase switching device.
摘要:
A switchgear control apparatus includes a zero point interval detecting circuit, an interruption time judgment circuit and a reclosing time decision circuit. The zero point interval detecting circuit detects time intervals between successive zero points of a main circuit current. The interruption time judgment circuit judges that interruption time of the main circuit current is time of a zero point immediately preceding a zero point at which a difference between the time interval between two successive zero points and half the period of a commercial AC voltage exceeds a specific value. Upon detecting the gradient of the main circuit current at the interruption time, the reclosing time decision circuit sets reclosing time at a point in phase where the AC voltage has a maximum negative value if the gradient is positive, and at a point in phase where the AC voltage has a maximum positive value if the gradient is negative.
摘要:
A substrate processing system comprises a substrate processing apparatus, an information storage server and a support computer, which are connected to a network respectively. When the substrate processing apparatus causes a failure, an alarm processing part extracts a necessary relevant log file and stores the same in a hard disk of the information storage server. A failure information generation part generates failure information, which in turn is finally stored in the hard disk of the information storage servers as a failure information database. An apparatus information uncasing part renders the relevant log file and the failure information database readable from the support computer located in a remote place. Thus, the relevant log file and the failure information database can be immediately read. In other words, provided is a substrate processing system rendering operation information immediately readable from a remote place when the substrate processing apparatus causes a failure.
摘要:
A target-closing phase-map generating section generates in advance a target closing phase map in consideration of a pre-arc characteristic and variations of a mechanical action of a breaker, and amplitude fluctuations of the load voltage. A target-closing time calculating section calculates a target closing time string from frequencies and phases of the power source voltage and the load voltage, respectively, of the breaker referring to the target closing phase map. A closing control section, when a close command 11 is inputted, controls the timing of outputting a closing control signal based on a predicted closing time and the target closing time string.
摘要:
A substrate processing system comprises a substrate processing apparatus and a support computer, which are connected to a network respectively. Updated countermeasure information is accumulated in the support computer by a system administrator. When the substrate processing apparatus causes a failure, content of the failure is displayed on a display part while an alarm processing part controls process according to an alarm definition file. Further, a countermeasure information acquisition part requires updated countermeasure information against the failure from the support computer. In response to this, countermeasure information distribution part of the support computer transmits updated countermeasure information. Thus, updated countermeasure information can be read instantly when a failure occurs.
摘要:
A substrate processing system comprises a substrate processing apparatus, an information storage server and a support computer, which are connected to a network respectively. When the substrate processing apparatus causes a failure, an alarm processing part extracts a necessary relevant log file and stores the same in a hard disk of the information storage server. A failure information generation part generates failure information, which in turn is finally stored in the hard disk of the information storage servers as a failure information database. An apparatus information uncasing part renders the relevant log file and the failure information database readable from the support computer located in a remote place. Thus, the relevant log file and the failure information database can be immediately read. In other words, provided is a substrate processing system rendering operation information immediately readable from a remote place when the substrate processing apparatus causes a failure.