This discourse, which analyze the principle of work of the hydraulic overloading protector and make a detailed calculating example, provides a scientific reference about how to select and apply the type of hydraulic overloading protector for the designation.

Study on revoking overload and overvoltage protection of YBX-1;

Analysis of overload protection failure of PET melt booster pump;

Applying the technology of high efficiency withdraw- filings and integration of machinery with electronics,the new adjustment and high effective negative pressure device and electromagnetic device with overload protection are developed.

IC type overload protection circuit has gradually replaced thermal relay overload protection mode.

Based on the method of solving heat balance differential equation,a novel over-load protection criterion for electric motor is presented in the paper considering the heat accumulation of motor.

The over-load protection technology is an indispensable constituent of the low-voltage apparatus intellectualization, ensuring the electric motor and the distribution line safe operation.

The paper proposed a design scheme of an intelligent type electronic over-load protection relay of motor based on μC/OS-II embedded operating system and LPC2292 embedded microprocessor.

It is necessary to set over-voltage protection,over-current protection,di/dt protection and du/dt protection circuit for thyristor in thyristor converter circuit to guarantee its normal operation.

It also discusses the problems universally existing in the over-voltage protection system of the similar mode at present time and puts forward the plan of solution.