2results about How to "Not affected by interference" patented technology

The utility model discloses a CT self-power-taking protection device, and belongs to the technical field of power relay protection. The device comprises a fault current detection loop, a CT power taking loop and a self-protection module. The fault current detection loop is composed of a phase current detection device, a zero-sequence current synthesis detection device and an over-current fuse device and is used for detecting an inter-phase and zero-sequence over-current fault, and the over-current fuse device is fused when the fault occurs; the CT power taking loop is provided with a rectifier bridge, a CT opening voltage storage capacitor, a high-voltage trigger conduction diode and an output loop, CT opening energy can be obtained through the voltage storage capacitor and the diode, and the output loop drives a trip coil to trip off a circuit breaker to cut off a fault loop; the self-protection module comprises an overvoltage protection loop and an overcurrent protection loop, is composed of a current-limiting resistor, and can clamp and discharge abnormal high voltage and overcurrent in the loop. The device adopts a full-analog circuit design, has the advantages of quick response, high reliability, strong interference resistance and the like, can quickly and accurately act in a complex electromagnetic environment, and effectively guarantees the safety of a power system.

The utility model discloses an intelligent learning tablet protection device integrated with a reading mirror function. The shell can be buckled to the tablet computer, the leather sheath is attached to the back of the shell and can be folded to cover the tablet computer, the pen groove is formed in the leather sheath and used for containing a control pen, and the finger-reading mirror device is detachably installed and positioned on one side of the shell. The leather sheath can be folded to form a supporting structure which abuts against the back of the shell to obliquely support the tablet personal computer. The pen groove is formed in the leather sheath, and the tablet computer cannot be in contact with the control pen after being installed on the shell, so that impact is effectively prevented from being transmitted to the tablet computer through the control pen, and protection on the tablet computer is increased. And secondly, after the pen slot is arranged on the leather sheath, a finger-reading mirror device can be conveniently added on the shell, the interference influence of the pen slot is avoided, the finger-reading effect can be quickly realized, an independent finger-reading mirror does not need to be additionally configured, and the functional requirements of learning, question shooting and the like are met.