TVOC-2-240 1SFA664001R1001延时剩余过电流保护旨在用于坚固和低电阻接地系统。延时剩余过电流保护适用于相间接地故障的后备保护，通常通过距离保护操作跳闸。保护功能还可以作为高电阻接地故障的保护剩余电流测星元件连续测量剩余电流，并将其与设定的操作值QIN进行比较。滤波器确保对干扰和直流分量的抗扰性，并最大限度地减少瞬态超驰。如果测量的电流高于设定值IN，则启动信号STNQ被激活。定时器tN被激活，并且剩余过电流跳闸信号TRN在设定时间之后被激活。一般跳闸信号也被激活。输入信号BLOCK阻止该功能。输入信号BLKTR阻断跳闸信号。
TVOC-2-240
过电流保护TOC2的两个电流时间阶段通过使用具有短时间延迟的高设定电流阶段，提高了对附近故障进行快速操作的可能性。低电流级设置有适当的时间延迟，以获得系统中相邻继电器的选择性。在具有反时限延迟继电器的网络中，通常通过对所有过电流继电器使用相同类型的反时限特性来获得最佳选择性。如果选择了反向时间延迟，则当电流高于设定值大于Low时，计时器tMinInv启动。
TVOC-2-240
电流测量元件连续测量所有三相中的电流，并将其与两个电流级的设定操作值进行比较。滤波器确保对干扰和直流分量的抗扰性，并最大限度地减少瞬态超驰。如果三相中的任何一相的电流高于设定值大于Low，则激活低电流级的启动信号。通过设置Characteristic等于Def,计时器被激活，跳闸信号TRLS在设置时间后被激活。
TVOC-2-240
TVOC-2-240 1SFA664001R1001 delayed residual overcurrent protection is designed for rugged and low resistance grounding systems. Delayed residual overcurrent protection is suitable for backup protection against phase to phase ground faults, typically tripping through distance protection operation. The protection function can also serve as a residual current measuring element for high resistance grounding faults, continuously measuring residual current and comparing it with the set operating value QIN. The filter ensures immunity to interference and DC components, and minimizes transient overshoot. If the measured current is higher than the set value IN, the start signal STNQ is activated. Timer tN is activated, and the residual overcurrent trip signal TRN is activated after the set time. The general trip signal is also activated. The input signal BLOCK blocks this function. The input signal BLKTR blocks the trip signal.
TVOC-2-240
The two current time stages of overcurrent protection TOC2 increase the possibility of rapid operation on nearby faults by using a high set current stage with short time delay. The low current stage is set with appropriate time delay to achieve selectivity of adjacent relays in the system. In networks with inverse time delay relays, the optimal selectivity is usually achieved by using the same type of inverse time characteristic for all overcurrent relays. If reverse time delay is selected, the timer tMinInv starts when the current is higher than the set value and greater than Low.
TVOC-2-240
The current measuring element continuously measures the current in all three phases and compares it with the set operating values of the two current levels. The filter ensures immunity to interference and DC components, and minimizes transient overshoot. If the current of any one of the three phases is higher than the set value and greater than Low, the start signal of the low current stage is activated. By setting Characteristic equal to Def, the timer is activated, and the trip signal TRLS is activated after the set time.
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