The paper analyzes the rationality of increasing this voltage limitation value and the influences on engineering application,presents some countermeasure in respects of sheath protector,fabrication,traying and transportation of cable.

Test of carrying capacity of thrust bearing on protector of submersible electric motor;

Developing of automatical protector for rope's loosing in hoister;

Self-recover Over and Behind Voltage Protector;

At present,it is advo-cated that optimal blood pressure lowering drugs should be with the good blood pressure lowering effect,and with the organ protection effect.

Aiming at the problem that excess temperature of windings affects insulating property in running of motor,the paper designed a new thermal protector with single-chip microcomputer based on fuzzy control.

The paper related applications of bimetal thermal protector,semiconductor ceramic thermistor and high molecular polymer PTC element in different variety of micromotor,brief introduced their structure and operating characteristic of three kinds thermal protector elements.