1 Protection and control devices 1.3.2.1 PROTECTION FUNCTIONS OF ELECTRONIC RELEASES The protection functions available for the electronic releases are: L - Overload protection with inverse long time delay Function of protection against overloads with inverse long time delay and constant specific let-through energy; it cannot be excluded. L - Overload protection in compliance with Std. IEC 60255-3 Function of protection against overloads with inverse long time delay and trip curves complying with IEC 60255-3; applicable in the coordination with fuses and with medium voltage protections. S - Short-circuit protection with adjustable delay Function of protection against short-circuit currents with adjustable delay; thanks to the adjustable delay, this protection is particularly useful when it is necessary to obtain selective coordination between different devices. S2 - Double S This function allows two thresholds of protection function S to be set independently and activated simultaneously, selectivity can also be achieved under highly critical conditions. D - Directional short-circuit protection with adjustable delay The directional protection, which is similar to function S, can intervene in a different 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 oppo

1.保护和控制装置
1.3.2.1电子脱扣器的保护功能
电子脱扣器可用的保护功能包括：
L-带反向长延时的过载保护
反时限长延时过载保护功能
恒定的特定通过能量；它不能被排除在外。
L-符合标准IEC 60255-3的过载保护
具有反长延时和跳闸的过载保护功能
符合IEC 60255-3的曲线；适用于与保险丝配合使用
并配有中压保护装置。
S-具有可调延迟的短路保护
具有可调延迟的短路电流保护功能；谢谢
对于可调延迟，这种保护在必要时特别有用
获得不同设备之间的选择性协调。
S2
-双S
该功能允许独立设置和同时激活两个保护功能阈值，也可以在以下条件下实现选择性
非常关键的条件。
D-具有可调延迟的方向短路保护
方向保护类似于功能S，可以在
根据短路电流的方向采用不同的方式；尤其
适用于网状网络或多条并联供电线路。
I-带瞬时跳闸的短路保护
用于瞬时短路保护功能。
EFDP-早期故障检测和预防
由于该功能，该释放装置能够在比之前更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-带可调延迟的接地故障保护
保护设备免受接地故障影响的功能。
U相不平衡保护
保护功能，当两个传感器之间出现过度不平衡时进行干预
检测断路器保护的单相电流。
OT-防止超温的自我保护
保护功能控制断路器的断开，当
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-过压保护
保护功能，当相电压超过
预设阈值。
RV-剩余电压保护
识别中性导体上异常电压的保护。
RP-反向电源保护
当有功功率方向为oppo时进行干预的保护