2.2.1 Curves 1.0 The software “Curves”, which can be downloaded from our web site http://bol.it.abb.com, is a tool dedicated to who works in the electrical engineering field. This program allows the visualization of : • I-t LLL: tripping characteristics for three-phase faults; • I-t LL: tripping characteristics for two-phase faults; • I-t LN: tripping characteristics for single-phase faults; • I-t LPE: tripping characteristics for phase-to-earth faults; • I-I2 t LLL: specific let-through energy for three-phase faults; • I-I2 t LL: specific let-through energy for two-phase faults; • I-I2 t LN: specific let-through energy for single-phase faults; • I-I2 t LPE: specific let-through energy for phase-to-earth faults; • Peak: current limitation curve; • Cable and fuse characteristic curves. Besides, other program features are the verifications of cable protection, of human beings’ protection and of discrimination. The algorithms for the verification of the cable protection are described in the international standards. The algorithms for the verification of discrimination are implemented in accordance with the guidelines provided in ABB SACE Technical Application Papers, specifically “QT1: Low voltage selectivity with ABB circuit-breakers” (QT1 from now on). The software “Curves” displays tripping and limiting characteristics according to the catalogues.

2.2.1曲线1.0
软件“Curves”，可以从我们的网站下载
http://bol.it.abb.com，是专门为电气工程领域的工作人员提供的工具。
该程序允许可视化：
•I-t LLL：三相故障的跳闸特性；
•I-t LL：两相故障的跳闸特性；
•I-t LN：单相故障的跳闸特性；
•I-t LPE：相间接地故障的跳闸特性；
•I-I2
t LLL：三相故障的特定通过能量；
•I-I2
Tll：两相故障的特定通过能量；
•I-I2
t LN：单相故障的特定通过能量；
•I-I2
t LPE：相对地故障的特定通过能量；
•峰值：电流限制曲线；
•电缆和保险丝特性曲线。
此外，其他程序功能包括验证电缆保护，例如
保护和消除歧视。国际标准中描述了验证电缆保护的算法。这个
验证歧视的算法按照
根据ABB SACE技术应用文件中提供的指南，
特别是“QT1：ABB断路器的低电压选择性”（QT1来自
现在开始）。软件“曲线”显示跳闸和限制特性
根据目录。