短路保护
Short circuit protection
短路保护就是短路瞬时跳闸。要注意在负荷变化后及时调整保护的整定值，防止整定值过小频繁跳闸影响供电质量，或整定值过大使线路和设备得不到有效保护。
Short circuit protection is short-circuit instantaneous tripping. Attention should be paid to adjusting the setting value of the protection in time after the change of the load, so as to prevent the setting value over small frequent trips to influence the quality of the power supply, or the setting value of the ambassador line and equipment can not be effectively protected.
过载延时保护
Overload delay protection
过载延时保护是指负荷电流超过设备的限定范围有烧毁设备的危险，保护装置能在一定时间内切断电源。过载有个热量积累的过程，保护动作不需要过于迅速。对于短时过电流，保护不应该动作。
Overload delay protection means that the load current exceeds the limits of the equipment and has the danger of burning equipment. The protection device can cut off the power supply in a certain time. Overload has a process of heat accumulation, and protection does not need to be too fast. For short-time overcurrent, protection should not act.