live-front capacitor/reactor compartment of the MV-PMHFB
allows for viewing, maintenance, and removal of vacuum
switches, CPT, reactors, and double bushing capacitors.
control compartment is segregated from the incoming compartment
and the capacitor/reactor 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,
Medium Voltage Pad-Mounted Harmonic
Power Systems, Inc. (NEPSI's) medium voltage pad-mounted
harmonic filter banks are typically utilized for
underground utility distribution systems in areas
that are accessible to the public and where harmonic
generating loads are present. These filter banks
are low profile, tamperproof, and are painted
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
Standard. Fully engineered, tuned, multi-tuned,
partially tuned, and de-tuned harmonic filters
Single Stage and two
stage pad-mounted harmonic filter banks
from 600 kvar to 3000 kvar in voltages to
remove system resonance concerns, reduces
voltage distortion, and allows for IEEE
banks can be customized and engineered to
meet utility system conditions and performance
control of power factor from light load
conditions through heavy load conditions.
MV-PMHFB provides a familiar "dead-front"
interface for installation, maintenance,
and operation by utility line-crews.
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.
low-profile compact design comes fully assembled
and ready for interconnection.
all-welded enclosure 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, iron-core reactor, 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 ease of placement
by crane. The doors are equipped with 3-point
pad lockable latching door handles and recessed
penta-head bolts. 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 filter bank (i.e. heaters, convenience
outlet, switches, etc.) and power factor, var,
and voltage sensing.
Fisher Pierce Meter Socket
Each harmonic filter
bank is equipped with a four or six terminal Meter
Socket for accepting standard socket style
capacitor bank controllers.
Each pad-mounted harmonic
filter 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.
Low loss, double bushing
harmonic filter-rated capacitors that meet or
exceed IEC 871, IEEE 18 and CSA standards. Capacitors
are connected ungrounded-wye as standard. Internal
discharge resistors reduce the residual voltage
to less than 50 volts within 5 minutes of de-energization.
The dielectric fluid is environmentally friendly,
biodegradable, non PCB, with low toxicity. Internally
fused capacitors are available upon request.
Harmonic Filter Reactors
filter reactors provide the necessary reactance
to tune the capacitor bank to the desired frequency.
In addition to tuning, these reactors significantly
reduce the frequency and magnitude of inrush
currents from back-to-back capacitor bank switching.
bus bars, phase and ground, are silver-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/reactor compartment as
well as the main-incoming compartment through
the entire width of the enclosure
on the switch, capacitors, and iron-core harmonic
- Typical One-Stage
Pad-Mounted Harmonic Filter Bank
Showing Location of Isolated Compartments
and Bank Features
Distribution Class Lightning Arresters can be
provided for transient voltage protection of the
hot environments, a thermostatically controlled
fan can be provided for ambient control of the
Voltage Capacitor Switching Controls
When the filter bank application
is near sensitive industrial or commercial loads,
zero-voltage closing controls can be provided
to switch the filter bank on at 0-voltage.
This control will virtually eliminate switching
transients associated with filter bank energization.
15 amp GFI convenience outlet can be provided
in the control compartment for local power.
can be provided for high visibility during maintenance,
and to allow for viewing of fuses through the
hinged Lexan window.
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.
steel or aluminum construction, special finishes,
single stage or multistage, insulated bus, mimic
bus, dead-front or live-front design, air-disconnect
switch, hinged compartment barriers, ground switch.
Pad-Mounted Harmonic Filter Bank
NEPSI's Pad-Mounted Harmnic
Filter 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 web page:
Sorry, budgetary pricing is
not yet available on the Web.
- 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.