Installation
68 REVISION 02 * INSTALLATION SIMOSEC * 832-6063.0
16.7 Testing
SIMOSEC switchgear is well prepared to fulfill the following tests:
Following tests should be made on the equipment (observe manufacturers and local
prescriptions):
• An insulation resistance test is made on the high voltage circuit to be sure that all con-
nections made in the field are properly insulated. An insulation resistance test is also
advisable on the control circuit.
• A dielectric test, if possible, should be made on the high voltage circuit for one minute
at one of the above shown voltages (see table) corresponding to the rated voltage of
the equipment. (Note: Voltage transformers, control power transformers, surge arre-
sters, and surge capacitors must be disconnected during this test. The test sockets of
capacitive voltage indication system must be grounded).
Note: The DC test voltage is given as a reference only for those using DC Tests to
verify the integrity of connected cable installations without disconnecting the cables
from the switchgear. It represents values believed to be appropriate and approximately
equivalent to the corresponding power frequency withstand test values specified for
each voltage rating of switchgear. The presence of this column in no way implies any
requirement for a DC withstand test on AC equipment or that a DC withstand test
represents an acceptable alternative to AC withstand tests. When making DC Tests,
the voltage should be raised to the test value in discrete steps and held for a period of
one minute.
In accordance with ANSI C37.20.3 Clause 6.5, Field Dielectric Tests are also recom-
mended when new units are added to an existing installation, or after major field modi-
fications. The equipment should be put in good condition prior to the field test. It is not
expected that equipment shall be subjected to these tests after it has been stored for
long periods of time or has accumulated a large amount of dust, moisture, or other
contaminants without being first restored to good condition.
A dielectric test on secondary and control circuits should be made for one minute at
1125 volts AC or 1590 volts DC. The above voltages are in accordance with NEMA
Standards. (Note: Certain control devices, such as motors and motor circuits, should
be tested at 675 volts AC. Electronic devices should be tested at the voltages speci-
fied in the instruction manual for the electronic device).
Rated
Maximum
Voltage
kV (rms)
Power
Frequency
Withstand
kV (rms)
Field Test Voltage
kV (rms) kV (dc)
4.76 19 14.25 20.2
8.25 36 27 38.2
15 36 27 38.2
27.6 60 45 63.6
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