摘要:
A spring operation device for use in a switchgear includes an interlock bar, attached at its one end to a lock plate and includes a switch-on electromagnet that has a plunger provided with a flange portion. The lock plate is pushed by a lock member that is attached to a four-joint link and the position of the lock plate is changed by being rotated. During an opening operation of a switching contact, the other end of the interlock bar is arranged above the flange portion to stop the forward movement of the plunger of the switch-on electromagnet so as to prevent a switch-on trigger from rotating. During a closing operation of the switching contact, the other end of the interlock bar is arranged at a position that does not stop the plunger of the switch-on electromagnet from moving forward so that the switch-on trigger is allowed to rotate.
摘要:
An apparatus for predicting an operating time in a power device includes an operating characteristic parameter estimating unit, and only the operation historical data in the vicinity of a current operation environmental condition is extracted and input by a vicinity operation historical data extracting unit.
摘要:
A power switching control device and a closing control method thereof that can suppress generation of a transient voltage or current that is possibly caused by a variation in a load-side voltage after interrupting a current are obtained. A circuit-breaker-gap-voltage estimate value at and after a present time is calculated based on a power-supply-side voltage estimate value and a load-side voltage estimate value at and after the present time, a target closing-time domain from a closing controllable time to a closing control limit time in which a circuit breaker can be closed at a timing when an absolute value of the circuit-breaker-gap-voltage estimate value falls within a preset allowable range is calculated based on this circuit-breaker-gap-voltage estimate value, and the closing controllable time is delayed by a preset delay time in a case of a subsequent closing phase of a second or later closing phase.
摘要:
An apparatus for predicting an operating time in a power device includes an operating characteristic parameter estimating unit, and only the operation historical data in the vicinity of a current operation environmental condition is extracted and input by a vicinity operation historical data extracting unit.
摘要:
A circuit breaker includes: a first arc-extinguishing chamber and a second arc-extinguishing chamber that interrupt a current by opening contact points and extinguish an arc during the current is being interrupted; and a connection unit that connects the first arc-extinguishing chamber and the second arc-extinguishing chamber to each other. The first arc-extinguishing chamber and the second arc-extinguishing chamber are connected to the connection unit in such a manner that shaft lines of the arc-extinguishing chambers form an angle of substantially 90 degrees. The first arc-extinguishing chamber is arranged on a side of the connection unit in such a manner that the shaft line thereof is substantially horizontal, and the second arc-extinguishing chamber is arranged on an upper side of the connection unit in such a manner that the shaft line thereof is substantially vertical.
摘要:
A target pole-close timing determining unit corrects a breaker characteristic correction signal of a preceding turn-on phase by using a correction amount which is proportional to an absolute value of the interpolar voltage upon turn-on of the proceeding turn-on phase, and a correction amount which is proportional to an elapsed time after a target pole-close timing of the preceding turn-on phase, to generate a subsequent phase interpolar voltage signal, and determines a target pole-close timing of the subsequent turn-on phase at a timing when the subsequent phase interpolar voltage signal is equal to or smaller than a threshold value.
摘要:
An inrush-current suppressing device includes a residual-magnetic-flux calculation unit that obtains a residual magnetic flux generated within a three-phase transformer, an input magnetic-flux-error calculation unit that obtains a closing-phase input magnetic-flux error, a closing-order determination unit that determines a closing order of phases of a three-phase breaker, a target-closing-phase/time setting unit that sets a time from a reference point to a target closing phase of a first closing phase as a first target closing time, and sets a time obtained by adding up a time from the reference point to a target closing phase of a second closing phase and a delay time set to exclude a period in which a magnetic flux in the first closing phase possibly saturates as a second target closing time, and a closing control unit that generates and outputs a closing control signal to close each phase at the target closing time.
摘要:
A circuit breaker includes: a first arc-extinguishing chamber and a second arc-extinguishing chamber that interrupt a current by opening contact points and extinguish an arc during the current is being interrupted; and a connection unit that connects the first arc-extinguishing chamber and the second arc-extinguishing chamber to each other. The first arc-extinguishing chamber and the second arc-extinguishing chamber are connected to the connection unit in such a manner that shaft lines of the arc-extinguishing chambers form an angle of substantially 90 degrees. The first arc-extinguishing chamber is arranged on a side of the connection unit in such a manner that the shaft line thereof is substantially horizontal, and the second arc-extinguishing chamber is arranged on an upper side of the connection unit in such a manner that the shaft line thereof is substantially vertical.
摘要:
An inrush-current suppressing device includes a residual-magnetic-flux calculation unit that obtains a residual magnetic flux generated within a three-phase transformer, an input magnetic-flux-error calculation unit that obtains a closing-phase input magnetic-flux error, a closing-order determination unit that determines a closing order of phases of a three-phase breaker, a target-closing-phase/time setting unit that sets a time from a reference point to a target closing phase of a first closing phase as a first target closing time, and sets a time obtained by adding up a time from the reference point to a target closing phase of a second closing phase and a delay time set to exclude a period in which a magnetic flux in the first closing phase possibly saturates as a second target closing time, and a closing control unit that generates and outputs a closing control signal to close each phase at the target closing time.
摘要:
A power switching apparatus includes a breaker unit, an operating unit, a measuring unit, and a controlling unit. The breaker unit is connected on a three-phase current line, and includes switches each corresponding to one of phases of the three-phase current line. The operating unit simultaneously turns on or off the switches. The measuring unit measures a current flowing in each phase, and determines a time point where current flowing in one of the phases becomes zero as a reference time point. The controlling unit controls, when interrupting load current, the operating unit to turn off the switches in a range from 20 degrees to 40 degrees of an electric angle from the reference time point.