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降低鏈條；其他斷路器必須能夠
承受與通道相關(guān)的熱應(yīng)力和電動應(yīng)力
故意延時的故障電流。選擇性斷路器，
通常為空氣式，必須用于各種級別，以確保足夠的
高短時耐受電流；
•短路電流引起的干擾持續(xù)時間
未受故障影響的區(qū)域內(nèi)的電源電壓可能會導(dǎo)致電子和機(jī)電設(shè)備出現(xiàn)問題（電壓低于
電磁釋放值）；
•歧視級別的數(shù)量受到
網(wǎng)絡(luò)可以穩(wěn)定運(yùn)行。
以下示例顯示了獲得的時間判別的典型應(yīng)用
通過不同設(shè)置不同保護(hù)裝置的跳閘時間。
電子版本：
E4S 4000 PR121-LSI In4000
E3N 2500 PR121-LSI In2500
T7H 1600 PR332-LI In1600
L（長延遲）
設(shè)置：0.93
曲線：36秒
設(shè)置：1
曲線：24秒
設(shè)置：1
曲線：18s
S（短延遲）
設(shè)置：10
曲線：0.5s
設(shè)置：10
曲線：0.2s
I（IST）
關(guān)
關(guān)
設(shè)置：10
cally lower down the chain; the other circuit-breakers have to be capable of withstanding the thermal and electro-dynamic stresses related to the passage of the fault current for the intentional time delay. Selective circuit-breakers, often air type, have to be used for the various levels to guarantee a sufficiently high short-time withstand current; • the duration of the disturbance induced by the short-circuit current on the power supply voltages in the zones unaffected by the fault can cause problems with electronic and electro-mechanical devices (voltage below the electromagnetic releasing value); • the number of discrimination levels is limited by the maximum time that the network can stand without loss of stability. The following example shows a typical application of time discrimination obtained by setting differently the tripping times of the different protection devices. Electronic release: E4S 4000 PR121-LSI In4000 E3N 2500 PR121-LSI In2500 T7H 1600 PR332-LI In1600 L (Long delay) Setting: 0.93 Curve: 36s Setting: 1 Curve: 24s Setting: 1 Curve: 18s S (Short delay) Setting: 10 Curve: 0.5s Setting: 10 Curve: 0.2s I (IST) Off Off Setting: 10
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