Series-trip solenoid
Fault-current sensing is provided by a series-connected
solenoid coil that carries line current. When a fault occurs,
tripping is initiated by the solenoid plunger.
The plunger, normally held at rest by the closing springs, is
drawn into the coil by the magnetic force generated by the
fault current. Downward travel of the plunger overtoggles
springs in the contact assembly that open the recloser
contacts. The same motion charges the closing springs in
preparation for a reclosing operation.
When the circuit is opened, the solenoid coil is
de-energized, allowing the closing springs to close the
contacts and simultaneously return the plunger to its
original position.
Hydraulic control mechanism
The hydraulic control mechanism provides selectivity in
timing, enabling flexibility in application and coordination
with other equipment. All timing is governed by the
hydraulic mechanism that:
1. Controls the timing before contact opening.
2. Establishes the time delay before the contacts reclose.
3. Counts the number of operations.
4. Causes the recloser to lock out when the preset
number of trip operations has been completed.
Fast and delayed timing characteristics
Variations of timing characteristics and sequences can be
programmed for a maximum of four operations. When
a recloser is programmed for both fast and delayed
operations, the fast operations, involving no intentional
time- delay, occur first in the sequence, according to the
recloser’s “A” curve time-current characteristic. Delayed
operations are according to the recloser’s “B” or “C”
time-current curve (“B”, “C”, or “D” curves for Types E,
4E, V4E, L and V4L). See
Time Current Curves R280-91-10
for Type E reclosers;
R280-91-8
for Type 4E;
R280-91-1
for
Type H;
R280-91-2
for Types 4H, V4H;
R280-91-15
for Types
V4E, V4L; and
R280-91-3
for Type L.
Figure 1 . Type H time-current characteristics, 50 amp coil
3600
3000
2400
1800
1200
600
480
360
300
240
180
120
60
48
36
30
24
18
12
6.0
4.8
3.6
3.0
2.4
1.8
1.2
0.6
5 6
8
10
20
30
40
50
60
80
100
200
300
400
500 600
800
1000
2000
60
50
40
30
20
10
8
6
5
4
3
2
1
.8
.6
.5
.4
.3
.2
0.1
.08
.06
.05
.04
.03
.02
.01
3000
4000
5000
CURRENT IN AMPERES
TCC-252
TIME IN SECONDS
TIME IN CYCLES (60-HERTZ BASIS)
50-AMP COIL -
RECLOSER CLEARING TIME
Curve A: Maximum clearing time for
one operation, variations negative
Curves B & C: Average clearing time
for one operation, variations ±10%
Tests conducted at 25C
A
B
C
Figure 2 . Recloser operating levers, indicators, and
data plates
Non-reclosing
lever
Manual
operating
handle
Data plates
Sleet hood
Figure 3 . Operations counter located under sleet hood
2
Types E, 4E, V4E, H, 4H, V4H, L, and V4L single-phase recloser installation and operation instructions
OPERATION INSTRUCTIONS
MN280051EN May 2017
