The MET Tester is completely self-contained, capable of
performing all required checks and tests from a simple
verification of operation to a complete verification of all
operating parameters.
Refer to Service Information S280-76-1 Type MET Electronic
Recloser Control Tester Operating Instructions for proper
setup and use of the MET Tester.
Closing the Recloser During
Testing
Electrical Closing – Solenoid-Operated
Reclosers
Line voltage is required for automatic recloser operation
during testing of reclosers equipped with a closing solenoid
(except for reclosers equipped with the low voltage closing
accessory).
For on-line testing, bypass the recloser, open the load-side
disconnects and keep the source-side disconnects closed.
This will remove the recloser from service, but will keep line
voltage supplied to the closing solenoid (Figure 44).
For shop testing, the closing solenoid voltage is supplied
by back-feeding a transformer with a low-side rating equal
to the voltage rating of an available power source, and a
high-side rating equal to the voltage rating of the recloser
(Figure 46). A 75 kA transformer of the proper voltage
rating with an impedance drop of approximately 3% is
satisfactory. The AC source must have a comparable
impedance drop.
A test circuit for these solenoid-closed reclosers is shown
in Figure 46. The following equipment is required for the
recommended shop testing setup:
Note: Solenoid-closed reclosers equipped with a 120- or 240-
VAC low-voltage closing coil accessory can be tested as
shown in Figure 47.
S280-70-3
47
Figure 43.
Type MET electronic recloser control tester.
5 6
3
4
1 2
C
B
A
BYPASS SWITCHES
(CLOSED)
SOURCE SIDE
DISCONNECT SWITCHES
(CLOSED)
LOAD SIDE
DISCONNECT SWITCHES
(OPEN)
CLOSING
COIL
LOAD
SOURCE
SOURCE
LOAD
Figure 44.
Closing source-side switches of a bypassed “on-line” recloser provides closing solenoid power for automatic
operation during testing.
WARNING: Hazardous voltage. The switchgear
(apparatus and control) and high-voltage trans-
former must be in a test cage or similar protected area
to prevent accidental contact with the high-voltage
parts.
Solidly ground all equipment. Failure to comply can
result in death, severe personal injury, and equipment
damage. T221.5
WARNING: Hazardous voltage. Interconnect
source leads X and Y and ground solidly to the
recloser tank (Figure 46). Do not connect lead Z to any
other phase or mechanical ground. Dangerous voltages to
ground exist on the phase connected to lead Z. Solidly
ground all equipment. Failure to comply can result in severe
personal injury and/or equipment damage. T224.1
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