P12x/EN AP/A96
Application Guide
Page 32/80
MiCOM P120/P121/P122/P123
12.
COLD LOAD PICK-UP (P122 & P123 ONLY)
The Cold Load Pick-up
feature allows selected settings of
MiCOM P122
and
P123
relays to
be changed to react to temporary overload conditions that may occur during cold starts.
This condition may happen by switching on large heating loads after a sufficient cooling
period, or loads that draw high initial starting currents.
When a feeder is energised, the current levels that flow for a period of time following
energising may differ greatly from the normal load levels. Consequently, overcurrent settings
that have been applied to give short circuit protection may not be suitable during this period.
The Cold Load Pick-up
(CLP) logic included in MiCOM P122 & P123 relays raises the
settings of selected stages for a set duration. This allows the protection settings to be set
closer to the load profile by automatically increasing them after energising. The CLP logic
provides stability, without compromising protection performance during starting. Note that
any of the disabled overcurrent stages in the main relay menu will not appear in the Cold
Load PU Menu.
The following table shows the relay menu associated to the ‘
Cold Load Pick-up
’ logic, and
the setting ranges and setting by default (out of factory).
MENU TEXT
SETTING RANGE
STEP SIZE
AUTOMAT. CTRL
MIN
MAX
Cold Load PU
NO
YES
tI> NO
YES
tI>> NO
YES
tI>>> NO
YES
tI
e
> NO
YES
tI
e
>> NO
YES
tI
e
>>> NO
YES
t Therm
NO
YES
tI2> NO
YES
tI2>> NO
YES
level
20 %
500 %
1 %
tCL
100 ms
3 600 s
100 ms
The timer
tCL
in the CLP menu controls the time for which the relevant protections elements
in CLP menu (%) are altered following an external input signal (e.g. circuit breaker closure.
When the set
tCL
time has elapsed, all relevant settings revert back to their original values
or are unblocked.
tCL
is initiated thanks to a dedicated logic input signal (refer to
AUTOMAT. CTRL/INPUTS
menu), that is generated by connecting an auxiliary contact from the circuit breaker (52a or
52b) or starting device to the logic relevant inputs of the relay.
The following sections describe applications where the CLP logic may be useful and the
settings that need to be applied.
Содержание MiCom P120
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