34results about How to "Guaranteed quickness" patented technology

A sliding / swing-type portable digital communication apparatus including a main housing having a speaker unit positioned on its rear surface; key housings, each of which is positioned on a side of the main housing, the key housings being adapted to slide a predetermined distance toward or away from the main housing along a longitudinal direction for exposing or hiding the speaker unit according to whether or not the key housings have slid; and a swing housing adapted to rotate about a hinge axis, which is oriented perpendicular to the sliding direction of the key housings, within a predetermined range of angle while continuously facing an upper surface of the main housing and upper surfaces of the key housings for exposing and hiding predetermined areas of the key housings.

A sliding / swing-type portable digital communication apparatus including a main housing having a speaker unit positioned on its rear surface; key housings, each of which is positioned on a side of the main housing, the key housings being adapted to slide a predetermined distance toward or away from the main housing along a longitudinal direction for exposing or hiding the speaker unit according to whether or not the key housings have slid; and a swing housing adapted to rotate about a hinge axis, which is oriented perpendicular to the sliding direction of the key housings, within a predetermined range of angle while continuously facing an upper surface of the main housing and upper surfaces of the key housings for exposing and hiding predetermined areas of the key housings.

The invention belongs to the technical field of electrical switches, and relates to a permanent magnetic mechanism capable of adjusting the switching on-off time and an adjusting method thereof. The permanent magnetic mechanism comprises a permanent magnetic mechanism, and an outer yoke, an upper yoke, a lower yoke, a moving core, a core back cover, a pull rod, a switching-off spring, a contact spring, an adjusting nut, a locking nut, an inner yoke, a coil, and a permanent magnet, all of which are arranged inside the permanent magnetic mechanism. The outer yoke is arranged at the outer side of the permanent magnetic mechanism, the upper yoke and the lower yoke are fixedly installed at the upper and lower ends of the outer yoke, the switching-off spring is arranged in a cavity formed by the moving core, the core back cover and the upper yoke, and the contact spring is arranged between the lower end of a stepped circle at the upper end of the pull rod and the core back cover. By adopting the permanent magnetic mechanism of the invention, the switching on-off time can be adjusted, the time of tripping protection can be effectively shortened, and the quickness of line quick-break protection is ensured. The permanent magnetic mechanism and the adjusting method are especially suitable for a circuit break of which both the switching-off spring and the contact spring participate in the switching-on / off process and which is equipped with multiple permanent magnetic mechanisms, and are applicable to the field of electric power.

The invention discloses an inverse-time zero-sequence current protection method. The minimum motion time and maximum motion time of protection are set, motion time is allocated according to the minimum zero-sequence current and maximum zero-sequence current of over-current protection, and the motion time at the head end and the motion time at the tail end of the protected circuit of a curve are determined, so that the purposes that the whole curve is restrained and the speed of protection motion is improved are achieved; besides, the longest motion time of inverse-time zero-sequence current protection is increased, so that the speed and selectivity of protection are ensured at the same time. By means of the design, not only is the speed of protection ensured and improved, but also the selectivity of protection is ensured and improved.

The invention provides a method for voltage regulation and compensation for magnetizing inrush current locking of a voltage transformer, relates to a method for relay protection of a power system andespecially relates to a method used for voltage regulation and compensation for magnetizing inrush current locking in an ultra high voltage power grid. The method includes calculating phase current ofdifferent sides of the voltage transformer and DC component, fundamental wave, second harmonics, third harmonics and waveform degree of asymmetry of different current of longitudinal differential phases of the voltage transformer, calculating a floating magnetizing inrush current comprehensive locking constant value; according to the above calculation result, calculating inrush current coefficient comprehensive criterion and comparing the criterion with the floating magnetizing inrush current comprehensive locking constant value, and giving a harmonic content mark; using fundamental current for calculation and setting a split-phase action mark; identifying whether it is magnetizing inrush current or interior failure according to the calculated split-phase action mark and the magnetizing inrush current locking mark and implementing protection over the voltage transformer. The method can ensure the quickness of no-load input when in-zone failure occurs and can also ensure reliable locking through a floating threshold when a value is approximate to the magnetizing inrush current interior constant value.

The invention belongs to the technical field of electrical switches, and relates to a permanent magnetic mechanism capable of adjusting the switching on-off time and an adjusting method thereof. The permanent magnetic mechanism comprises a permanent magnetic mechanism, and an outer yoke, an upper yoke, a lower yoke, a moving core, a core back cover, a pull rod, a switching-off spring, a contact spring, an adjusting nut, a locking nut, an inner yoke, a coil, and a permanent magnet, all of which are arranged inside the permanent magnetic mechanism. The outer yoke is arranged at the outer side of the permanent magnetic mechanism, the upper yoke and the lower yoke are fixedly installed at the upper and lower ends of the outer yoke, the switching-off spring is arranged in a cavity formed by the moving core, the core back cover and the upper yoke, and the contact spring is arranged between the lower end of a stepped circle at the upper end of the pull rod and the core back cover. By adopting the permanent magnetic mechanism of the invention, the switching on-off time can be adjusted, the time of tripping protection can be effectively shortened, and the quickness of line quick-break protection is ensured. The permanent magnetic mechanism and the adjusting method are especially suitable for a circuit break of which both the switching-off spring and the contact spring participate in the switching-on / off process and which is equipped with multiple permanent magnetic mechanisms, and are applicable to the field of electric power.

The invention relates to a fast distance protection method and device for transmission line containing UPFC, By calculating the maximum equivalent impedance of the UPFC during normal operation, When the system fails, the maximum equivalent impedance of UPFC calculated in normal operation is used to calculate the fault compensation voltage, which can effectively prevent the risk of maloperation ofthe fast distance protection when the protection device is used near the UPFC side and when the reverse outlet fails. At that same time, when the protection device is use on the far UPFC side and a metallic failure occurs outside the positive direction region, the risk of the fast distance protection bee overstepped is prevented.

The invention discloses a wire microcomputer protection device based on an inrush discrimination technology. A current-loaded current transformer of a charging line is connected with an alternating current sampling module; the alternating current sampling module and a power module are both in bi-directional connection with a CPU (central processing unit) management module; the CPU management module is respectively in bi-directional connection with an input / output module and a man-machine interaction module; a CPU protection module comprises an A / D analog-to-digital conversion module and a digital signal processing module; and the CPU management module is connected with the A / D analog-to-digital conversion module and the digital signal processing module in sequence. The device can obviously improve the accuracy rate of wire protection operation and the power supply reliability of medium-low-voltage networks.