根据短路电流的方向不同；尤其
适用于网状网络或多条供电线路并联。
I-带瞬时跳闸的短路保护
瞬时短路保护功能。
EFDP-早期故障检测和预防
由于该功能，该释放装置能够在较短的时间内隔离故障
目前市场上提供的区域选择性。
Rc-剩余电流保护
该功能特别适用于低灵敏度剩余电流的情况
高灵敏度应用需要保护，以保护人员
反对间接接触。
G-具有可调延迟的接地故障保护
保护装置免受接地故障影响的功能。
U相不平衡保护
保护功能，当
检测由断路器保护的单相电流。
OT-过热自保护
保护功能控制断路器的断开
释放装置内的温度可能会危及其功能。
紫外线-欠压保护
保护功能，当相电压低于
预设阈值。
OV-过电压保护
当相电压超过
预设阈值。
RV-残余电压保护
识别中性导线上异常电压的保护。
RP-反向功率保护
当有功功率方向为oppo1.3类型释放时干预的保护
42保护和控制装置| ABB
1保护和控制装置
恢复正常运行。
UF-欠频保护
该频率保护检测网络频率低于
可调阈值，产生警报或打开电路。

fferent way according to the direction of the short-circuit current; particularly suitable in meshed networks or with multiple supply lines in parallel. I - Short-circuit protection with instantaneous trip Function for the instantaneous protection against short-circuit. EFDP - Early Fault Detection and Prevention Thanks to this function, the release is able to isolate a fault in shorter times than the zone selectivities currently available on the market. Rc - Residual current protection This function is particularly suitable where low-sensitivity residual current protection is required and for high-sensitivity applications to protect people against indirect contact. G - Earth fault protection with adjustable delay Function protecting the plant against earth faults. U - Phase unbalance protection Protection function which intervenes when an excessive unbalance between the currents of the single phases protected by the circuit-breaker is detected. OT - Self-protection against overtemperature Protection function controlling the opening of the circuit-breaker when the temperature inside the release can jeopardize its functioning. UV - Undervoltage protection Protection function which intervenes when the phase voltage drops below the preset threshold. OV - Overvoltage protection Protection function which intervenes when the phase voltage exceeds the preset threshold. RV - Residual voltage protection Protection which identifies anomalous voltages on the neutral conductor. RP - Reverse power protection Protection which intervenes when the direction of the active power is oppo1.3 Types of releases 42 Protection and control devices | ABB 1 Protection and control devices to normal operation. UF - Under frequency protection This frequency protection detects the reduction of network frequency above the adjustable threshold, generating an alarm or opening the circuit.