Siemens GM-SG

Inspection
and
Testing
Inspection
and
Testing
Before
the
equipment
is
energized
,
it
must
be
thoroughly
inspected
and tested
.
Correct
any
deviations
before
energization
.
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 /
IEEE
C
37.20
.
2
,
Clause
6.5
,
Field Dielectric
Tests
are
also recommended when
new
units
are
added
to
an
existing
installation
,
or
after
major
field modifications
.
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
specified
in
the
instruction manual
for
the electronic device
)
.
Inspection
Check
the
following
points
:
1
.
High voltage
connections
properly
insulated
.
2
.
Electrical
disconnecting
contacts
,
machined
parts
,
shutter
,
etc
.
,
checked
for
lubrication
and
operation
.
3
.
Blocking
,
supports
and
other
temporary
ties
removed
from
circuit breakers
,
instruments
,
relays
,
etc
.
4
.
Proper
fuses
correctly
placed
.
5
.
Temporary
wiring jumpers
(
used
on
the secondaries
of
current
transformers
wired
to
external devices
,
as
shown
on
wiring diagrams
)
removed
.
6
.
Ground
connections
properly
made
.
7
.
Incoming primary
and
secondary
connections
properly
made and checked
for
shorts
or
undesired
grounds
.
8
.
All
equipment
which has been
removed
during
assembly
has been
replaced
.
9
.
Relays
coordinated
with
other
relays
and
protection
devices
on
the
system
.
Refer
to
relay
instructions
before
making
any
adjustments
.
Consult
the local
utility
before
making
any
connections
to
the
power
supply
.
10
.
Storage
battery
fully
charged
and
provided
with
recharging
facilities
.
11
.
Interlocks
performing
properly
.
12
.
Circuit
breakers checked
and
prepared
per
instruction manuals
.
13
.
All
filters
in
vent
areas are
clean and
free of
shipping
or
construction material
.
A
CAUTION
Excessive
test
voltages
.
May
result
in
damage
to
equipment
Do
not
perform
dielectric
tests at test
voltages
exceeding
the
ratings
of
the tested
equipment
.
Testing
1
.
An
insulation resistance
test
is made
on
the
high
voltage
circuit
to
be
sure
that all connections made
in
the
field
are
properly
insulated
.
An
insulation
resistance
test
is also advisable
on
the control circuit
.
2
.
A
dielectric
test
,
if
possible
,
should be
made
on
the
high voltage
circuit
for
one
minute
at
one
of
the
following
voltages corresponding
to
the rated
voltage
of
the
equipment
.
(
Note
:
Voltage
transformers
,
control
power
transformers
,
surge
arresters
,
and
surge
capacitors
must
be disconnected
during
this
test
)
.
3
.
With
circuit breaker
in
the
TEST
position
make the
following
tests
on
each unit
:
A
.
Trip
and close the circuit breaker
with
the
control switch
.
B
.
Trip
the circuit breaker
by passing
sufficient
current
(
or
voltage
,
if
applicable
)
through
the
coils
of
protective
relays
.
C
.
Trip
and close the circuit breaker
from
any
remote
control locations
.
D
.
Operate
auxiliary
devices
.
E
.
Test
the
phase
sequence
of
polyphase high voltage
circuits
,
particularly
those used
for
motor
starting
.
Table
6
.
Field
Test
Voltages
Rated
Maximum
Frequency
Voltage
Withstand
kV
(
rms
)
kV
(
rms
)
Power
Field
Test
Voltage
kV
(
rms
)
kV
(
dc
)
4.76
19
14.25 20.2
8.25
36
27
38.2
36
27
38.2
15
45
Courtesy of NationalSwitchgear.com