30results about How to "Avoid false switching" patented technology

A method for distributing wireless resource in multicarrier time division duplexing mobile communication system, such as TD-CDMA system, to overcome the shortage of 3GPP single carrier cell channel distribution technology of covering more lager area in composing cellular system, which contains using an area of covering same or almost same as a cell, selecting one carrier as main carrier and other carriers as auxiliary carrier, the frequency of main carrier is as different as possible, setting all public control channel in main carrier, the left resource of main carrier and resource of auxiliary carrier are used in uplink and downlink service channel, the arrangement of public channel in main carrier is same with that in single carrier cell.

The invention relates to the technical field of hydropower station water turbine governor control systems, in particular to a water turbine governor servomotor double-sensor redundancy type fault detection method. By measuring and calculating the displacement change rate, the displacement change rate difference, the displacement change accelerated speed and other related variable values of two displacement sensors, corresponding logical judgment is conducted, and accordingly, the fault situation of the redundant displacement sensor of a servomotor is obtained. Through the method, the problem that under the condition that a slide block connection rod or a stay wire of a servomotor displacement sensor is broken, but an output signal is normal, the fault of the displacement sensor cannot be detected out can be effectively solved, and misjudgment for other fault types is effectively prevented; and the reliability of a water turbine governor control system is greatly improved, and safe stable operation of a water-turbine generator set is ensured.

The invention relates to an optical fiber line warning door line protection method of a wavelength division system, which concretely comprises the following steps of: subtracting the receiving optical power of a local terminal optical protection unit from the optical power of the transmitting port of a paired optical protection unit to obtain the line insertion loss value of a fiber core, and sequentially detecting the line insertion loss values of a main fiber core and a spare fiber core; wherein the line insertion losses are adopted as switching criterions which comprise two switching criterions, one switching criterion is the criterion for switching from a main line to a spare line and comprises the conditions that the line insertion loss value of any fiber core of a main fiber exceeds the set switching threshold value of the line insertion loss, and the line insertion loss values of two spare fiber cores are both above the set warning threshold of the line insertion loss; and the other switching criterion is the criterion for switching from the spare lines to the main line and comprises the conditions that the line insertion loss of any spare fiber core in the two spare fiber cores exceeds the set switching threshold, and the line insertion loss mean value of the two fiber cores is above the set warning threshold. The invention adopts the line insertion loss as the switching criterion for the line protection of the wavelength division system and effectively solves the difficult problem on multi-span section protection of the wavelength division system.