Auto Recloser - ABB Eagle Programming Manual

Cold load pickup function affects only 51-P1 & 51-P2 functionalities only. Once CLP is
activated the set X value is multiplied with Pickup value and the set
CLP
multiplied with time delay in the 51P1 and 51-P2 functions.
Table 7 User settings for Cold Load Pickup function
Parameter Range
Auto Disabled
initiation
Enabled
t
1 ... 180
CLPoff
X
1.0 ... 5.0
CLP
t
1 ... 180
CLP

4.4.5. Auto Recloser

Majority of overhead line faults are transients in nature and automatically cleared by
momentarily de-energizing the line. De-energizing of the fault location for a selected time
period is implemented through automatic reclosing, during which most of the faults can
be cleared.
In case of a permanent fault, the automatic reclosing is followed by final tripping. The auto-
reclose function can be used with any circuit breaker suitable for auto-reclosing. The
function provides three programmable auto-reclose shots and can be set to perform one
to three successive auto-re closures of desired duration.
Total number of auto-reclose operation to be made available is set using Number of reclose
attempts setting. Maximum 3 shots are possible.
The auto-reclose function can be made off by setting Number of reclose attempts to "0".
Recloser controller is responsible for issuing necessary circuit breaker close command.
Typical auto-reclose sequence is as follows: Once the function is initialized (AR initiation
matrix, section 4 below), it initiates the first auto-reclose shot. At the time of shot
initiation, the set dead time t1 will start. Just 20ms before the set reclose time is going to
elapses the function will check for the necessary conditions needed for issuing a reclosing
command. The conditions checked are
a) CB is open
Unit Step Default
- 1 Enabled Auto initiation of Cold load pickup
min 1 10
- 0.1 1.5
min 1 10
t
CLP
Description
Minimum time for which system remain
de-energized after which cold load pickup
function activates
Multiplier by with I> and I>> setting will be
multiplied during cold load time
Time duration for which cold load time
remains
value is
26