Huawei SUN2000-23KTL - Page 119

SUN2000 (8KTL-28KTL)
User Manual
8 Maintenance
Issue 07 (2014-07-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
113
Alarm
ID
Alarm
Name
Alarm
Severit
y
Causes
Measures
305
Frequen
cy
Abnorm
al
Major
The actual frequency of
the grid is higher than
the local grid standards
requirements.
1. If the alarm occurs
accidentally, the possible
cause is that a power grid
is abnormal accidentally.
The SUN2000
automatically recovers to
the normal operating
status after the fault is
rectified.
2. If this alarm occurs
repeatedly, check whether
frequency of the power
grid is within the
acceptable range. If no,
contact the local power
operator. If yes, change
the power grid
overfrequency and
underfrequency protection
points after obtaining
approval from the local
power operator. For
details about how to
change the points, see
7.2.9 Setting Protection
Parameters.
313
Low
Array
Insulatio
n
Resistan
ce
Major
The insulation resistance
against the ground for
PV arrays is less than the
minimum value. The
possible causes are as
follows:

The ground cable for
the PV arrays is
short-circuited.

PV arrays are
installed in a
long-term moist
environment.
1. Check the insulation
resistance against the
ground for the outputs of
PV arrays. If a short
circuit occurs, rectify the
fault.
2. If the insulation resistance
against the ground is less
than the default value in a
rainy environment, set the
insulation resistance
threshold. For details, see
7.2.9 Setting Protection
Parameters.