live-front capacitor compartment allows for maintenance
and removal of vacuum switches, CPT and double bushing
control compartment is segregated from the incoming compartment
and the capacitor compartment. Controls are built custom
to meet customer requirements. Above pictures shows a
Fisher Pierce 4400 AutoCap Capacitor Controller mounted
on a swing-out panel.
Budgetary Cost, Dimensions, and Weights
weights, and dimensions are for budgetary and planning purposes
only. For competitive pricing and exact weight and dimensions,
Power System's (NEPSI's) medium voltage pad-mounted
capacitor banks are designed for application on
utility distribution systems in areas that are
accessible to the public. These capacitor banks
are compact, low profile, and are painted "pad-mount"
green to blend in with the surrounding environment.
They are designed, constructed, and tested to
meet or exceed ANSI C57.12.28 Pad-Mount Enclosure
Single Stage and two
stage capacitor banks from 600 kvar to 3000
kvar in voltages to 34.5kV.
can be customized to meet utility requirements
or existing designs.
control of power factor from light load
conditions through heavy load conditions.
low-profile, compact design comes fully
assembled and ready for interconnection.
to install and maintain on underground distribution
system using standard 200 amp and 600 amp
loss reduction and voltage support on systems
largely composed of cable.
requirements of ANSI C57.12.28 and the original
Western Underground Committee Guide 2.13
for enclosure integrity.
unit designed to meet or exceed the requirements
of ANSI C57.12.28 for enclosure integrity. Enclosure
is constructed of 11 gauge galvanneal steel and
is painted Munsell Green No. 7GY3.29/1.5. The
base of the enclosure, as well as the capacitor
and switch supports consists of C4 x 5.4 structural
steel channel for rigidity and skidding into place.
The roof is cross-kinked for added strength and
water shedding. Removable lifting plates are provided
on each corner of the enclosure for easy placement
by a crane. The doors have 3-point pad lockable
latching door handles and a recessed penta-head
bolt. Rear doors contain tamperproof louvers for
ventilation. All doors are equipped with door
retainers to secure doors in an open position.
Enclosure is marked and labeled in accordance
with applicable IEEE and NEMA standards and has
a permanently stamped non-corrosive nameplate
affixed to the enclosure indicating key equipment
Low maintenance, long
life, group operated vacuum switches (oil
switches are available upon request) are provided
to switch the bank on and off. The vacuum
switches have a 200 amp capacitive switching current
line-to-ground connected control power transformer
is supplied with each bank for internal controls
of the capacitor bank (i.e. heaters, convenience
outlet, switches, etc.) and power factor, var,
and voltage sensing.
Fisher Pierce Meter Socket
Each capacitor bank
is equipped with a four or six terminal Meter
Socket for accepting standard socket style
capacitor bank controllers for var, temperature,
voltage, current, and time controllers.
Many of these controllers can be supplied, pre-wired
and configured by NEPSI.
Each capacitor bank
is equipped with a main incoming "radial
feed" dead front compartment for supply
termination. ("Feed-through" designs
are available on request). The compartment is
equipped with ANSI Standard 200 amp bushing
wells (600 amp bushing wells are available upon
request) and stainless steel parking stands
welded to the enclosure wall. A hinged Lexan
window is provided for viewing the status of
the main incoming fuses.
Each pad-mounted capacitor
bank is equipped with group fused all-film low
loss (0.07 watt/kvar) double bushing capacitors.
The capacitors are manufactured and tested to
meet or exceed the requirements of all applicable
NEMA and ANSI/IEEE standards. The dielectric
fluid is environmentally friendly, biodegradable,
non PCB, and has a low toxicity. Internal
discharge resistors reduce the capacitors residual
voltage to less than 50 volts within 5 minutes
of de-energization. Capacitors are typically
connected in a grounded-wye (ungrounded wye
or delta connection can be specified) configuration
and are group fused with current limiting fuses.
The current limiting fuses are removable through
a hinged Lexan window located in the main incoming
compartment. The fuses have a 40kA interrupting
rating and are equipped with blown fuse indicators.
bus bars, phase and ground, are Tin-plated for
maximum conductivity and corrosion resistance.
The phase bus is rated for at least 135% of
the bank current. The ground bus is provided
in both the capacitor compartment as well as
the main-incoming compartment through the entire
width of the enclosure
on the switch and capacitors.
- Typical One
Stage Pad-Mounted Capacitor Bank
Showing Location of Isolated Compartments
and Bank Features
Transient inrush reactors
can be supplied reduce the high frequency inrush
currents associated with back-to-back capacitor
bank switching. The reactors are rated to
carry 135% of the bank's nominal current.
They are epoxy impregnated and consist of Copper
Magnet Wire. The reactors are typically purchased
when other banks are installed in close proximity.
Distribution Class Lightning Arresters can be
provided for transient voltage protection of the
thermostatically controlled fan can be provided
for ambient control of the capacitor bank.
Voltage Capacitor Switching Controls
A zero-voltage closing control
can be provided to switch the capacitors on at
0-voltage. This control will virtually eliminate
switching transients associated with capacitor
energization. These controls are recommended
when the bank is installed near sensitive loads.
15 amp GFI convenience outlet can be provided
in the control compartment for local power.
Voltage, Temperature, Current Controller
Fisher Pierce Series 4400 POWERFLEX AutoCapô Adaptive
Capacitor Bank Controller (contact NEPSI for other
types and manufacturers) can be installed in the
pad-mounted capacitor bank prior to shipment.
This controller will automatically switch the
bank based on var, temperature, time, voltage,
Blown Fuse Detection
Each bank can be equipped
with a blown fuse detection system (also known
as neutral voltage/current unbalance detection
system) that will alert plant personnel of
a blown fuse. It consists of a over voltage/current
relay and a neutral voltage/current sensor.
The relay has an adjustable set point to trip
or alarm upon detection of a blown fuse.
can be provided for high visibility during maintenance,
and to allow for viewing of fuses through the
hinged Lexan window.
steel or aluminum construction, special finishes,
single stage or multi-stage, insulated bus, mimic
bus, deadfront or livefront design, air-disconnect
switch, hinged compartment barriers, ground switch.
Pad-Mounted Capacitor Bank
NEPSI's Pad-Mounted capacitor
banks are built in accordance with the standard
features listed in the above specification and
your specific requirements. Feel free to contact
NEPSI for a quote or to discuss your specific
application. For budgetary pricing, preliminary
dimensions, and weights, proceed to the following
Voltages or Bank Configurations Not Listed,
- Typical Three-Line Diagram. Ratings, Specific
Bank Configuration, and Components are Dependent
Upon Voltage Rating and Customer requirements
Northeast Power Systems, Inc.
66 Carey Road
Queensbury, New York 12804
Copyright © 1999
- 2009 Northeast Power Systems, Inc.