Huawei SUN2000-2KTL-L1 User Manual page 110

SUN2000-(2KTL-5KTL)-L1
User Manual
Figure E-1 Alarm details
Figure E-2 Definition of the percentage of the short-circuit position
Issue 01 (2020-04-17)

The positive and negative terminals of a PV string are connected to the PV+ and PV– terminals of
the solar inverter. The PV– terminal represents a possibility of 0% for the short-circuit position and
the PV+ terminal represents a possibility of 100% for the short-circuit position. Other percentages
indicate that the fault occurs on a PV module or cable in the PV string.
 Possible fault position = Total number of PV modules in a PV string x Percentage of possible
short-circuit positions. For example, if a PV string consists of 14 PV modules and the percentage of
the possible short-circuit position is 34%, the possible fault position is 4.76 (14 x 34%), indicating
that the fault is located near PV module 4, including the previous and the next PV modules and the
cables of PV module 4. The solar inverter has a detection precision of ± 1 PV module.
Copyright © Huawei Technologies Co., Ltd.
E Locating Insulation Resistance Faults
104