Specifications

J1
GE Limitamp
®
Medium Voltage Motor Control
Guideform Specifications
J
Controllers-CR194 Vacuum Stationary &
Drawout Contactors, 2400 -7200 Volts
General
These specifications cover NEMA Class E2 high-voltage
control for ____ volts, ____ phase, ____ Hertz as follows:
Controller #1:
(Squirrel-cage induction)
(Full voltage) (Non reversing) controller for (Wound-rotor induction)
(Reduced voltage) (Reversing) (Brush-type synchronous)
(Brushless synchronous)
motor rated at ____ horsepower.
Controller #2, etc. (as shown above)
All Controllers
Controller(s) shall be fused type employing current-limiting
sand pow
er fuses that give the controller an interrupting
rating of:
200 MVA, 3 phase symmetrical at 2400 Volts, 50/60 Hz
350 MVA, 3 phase symmetrical at 4200 Volts, 50/60 Hz
400 MVA, 3 phase symmetrical at 4800 Volts, 50/60 Hz
600 MVA, 3 phase symmetrical at 7200 Volts, 50/60 Hz
Contactors
Starter(s) shall employ magnetically held vacuum contactor(s)
rated at:
for welded enclosure:
400 amperes at 7200 volts maximum, interrupting rating of
75 MVA, 3 phase symm.
800 amperes at 5000 volts maximum, interrupting rating of
75 MVA, 3 phase symm.
for bolted enclosure:
400 amperes at 5000 volts maximum, interrupting rating of
50 MVA, 3 phase symm.
Contactor(s) shall be stationar
y (drawout for 400 amp con-
tactor only) and the coil shall be removable without removing
the contactor from the enclosure. The vacuum interrupter
wear checks shall not require removal of the contactor.
Controller(s) shall be in a:
for welded enclosure:
One-high line-up of NEMA ____ enclosure(s) equipped with
3-ph (1200)(2000)(3000) amp horizontal A
C bus
One-high individual NEMA ____ enclosure(s) equipped with
provisions for terminating incoming cable
for bolted enclosure:
Two-high line-up of NEMA ____ enclosure(s) equipped with
(1000)(2000)(3000) amp horizontal AC power bus
One-high line-up of NEMA ____ enclosure(s) equipped with
(1000)(2000)(3000) amp horizontal AC power bus
The power bus shall be braced for 80 kA RMS asymmetrical
or 50 kA RMS symmetrical.
For safety to personnel, enclosure(s) shall be compartmented
into low-voltage control compartment with separate door,
high-voltage compartment with separate interlocked door,
AC bus compartment with protective barriers and cable
entrance compartment.
The controller shall be isolated by a quick-make quick-break
switch operated by an externally mounted operating handle.
The isolating device shall disconnect the secondary of the
control power transformer before opening the main circuit
contacts.
Mechanical interlocks shall be provided to prevent:
1. Closing the isolation switch with the high-voltage door open.
2. Operation of the isolation switch while under load.
3. Opening of the high-voltage door when isolation switch is on.
4. Operation of the contactor when the isolation switch is in
an intermediate position.
Note: For overload protection, one three-pole ambient-compensated thermal-
overload relay, manually reset, shall be included.
Controllers rated 400 and 800 amperes shall be rated 60 kV
Basic Impulse Level (BIL).
Options
Each controller shall contain protection against single-phasing
due to a blown fuse and shall have blown fuse indication.
(Solid-state relay protection)
(Latched contactors)
Control for Wound-rotor Induction Motors
Secondary control shall be fully magnetic. It shall provide
automatic acceleration through ____ starting steps with
uniform torque peaks using a NEMA Class ____ resistor.
The control shall provide for continuous speed regulation
with ____ points of speed reduction with a maximum
reduction of ____ % from full-load speed at ____ % full load
torque.
Control for Synchronous Motors
DC field control for synchronous motors shall consist of one
GE Multilin SPM starting and protection module equipped
with digital displays for power factor, field current and line
current, one field starting and discharge resistor and one
electronic field contactor. Operation must be fully automatic.