RECLOSER CONTROL EVRC2A-N6,NT
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HANCED
TEC
HNOLOGY
7.12.2. Cold Load Pickup – Type 2
In the state of cold load, this type is used to restrain the operation of protection functions to over
current occurring by change of load (the close of a switch on long-distance line, incoming heavy
load etc.). This function to restrain protection functions rises or drops the pickup level of time
overcurrent element during certain time (E-CLP time) defined by a user.
Over Current Pickup Level Step Up
At power loss (a recloser is opened or a load current is 0A), the current of Over Current Pickup is
risen as follows.
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
−
×
−
+
=
)
1
'
(
1
'
Multi
CLP
E
Time
CLP
E
Time
Supply
Without
Multi
Load
Cold
l
Operationa
As example, when E-CLP Multi and E-CLT Time are set to be 3.0 and 60min respectively, over
30 min after power loss, the applied cold load multiple is 2. If the minimum working currentis
set to be 200A, the current of Over Current Pickup becomes 400A, twice as much as the
minimum working current. In addition, after 60 min, the cold load multiple is fixed to be 3.
Over Current Pickup Level Step Down
If power is restored (manual closed or restoration of load current (over 2A)), the current of Over
Current Pickup is dropped with the same speed when rising until the cold load multiple becomes
1.
When E-CLP Multi and E-CLP Time are set to be 3.0 and 60 min respectively, the graph of the
cold load multiple in
“Figure 7-6. Cold Load Multipilier”
is shown as follows.
NOTE:
The risen level of overcurrent pickup by multiple of cold load is the pickup level to operate
overcurrent protection element. The standard current level of TC curve is a minimum working
current.
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