Fused Double Bushing Harmonic Filtered Rated Capacitors Mounted
on C4-Structual Steel
Amp Vacuum Switches With Tin Plated Phase Bus Mounted on C4-Structual
Amp Air-Disconnect With Two Line-Side Connected Control Power
Transformers and Incoming Current Transformers
showing a 14.4kV, 9 MVAR 3 Step 3 Stage automatic harmonic filter
bank being offloaded at a utility substation in eastern Massachusetts.
This bank was installed and commissioned by NEPSI's installation
weights, and dimensions are for budgetary and planning purposes
only. For competitive pricing on specific requirements, as well
as weight and dimensions, contact NEPSI.
Single-Step & Multi-Step
Metal-Enclosed medium voltage harmonic filter
banks are designed for industrial, utility, and
commercial power systems to improve power factor,
reduce harmonic distortion, increase system capacity,
and improve voltage regulation. Virtually any
design constraint or provision can be met.
NEPSI's medium voltage
harmonic filter banks are designed for commercial,
industrial, and utility power systems requiring
power factor correction, harmonic control, IEEE
519 compliance, reduced system capacity, and
improved voltage regulation. Both indoor and
outdoor designs are available with a host of
options and accessories to fit the requirements
and desired configurations of virtually all
installations. Single stage and multi-stage,
single tuned or multi-tuned filter banks, with
or without high-pass configurations are available.
Filters reduce harmonic voltage and current
while correcting power factor
standing, compartmentalized, all welded, 11 gauge
galvanneal steel construction with 3 point pad-lockable
latching handles and stainless steel hinges. The
enclosure is painted with a corrosion resistant
ANSI gray-61 enamel paint. NEMA 3R construction
is standard, NEMA 12 and 4X are available as an
option. Base of enclosure as well as capacitor
supports are formed from C4 structural steel.
Door stays and windows are standard.
Interrupter Air Disconnect Switch
externally operated air-disconnect provides the
"visible-break" required by the NEC.
The switch is located in a separate compartment
that allows the main fuses and other components
located in the capacitor and reactor compartment
to be maintained without having to disconnect
power to the bus feeding the bank.
interlocked ground switch is provided to ground
the load-side terminals of the incoming air-disconnect
switch and/or capacitors for safety during maintenance.
Main incoming fuses provide main bus protection
and backup protection for the entire harmonic
Heavy-duty distribution class lightning arresters
protect the filter bank from lightning and switching
filter reactors provide the necessary reactance
to tune the capacitor bank to the desired frequency.
In addition to tuning, the reactors significantly
reduce the frequency and magnitude of inrush currents
from back-to-back capacitor bank switching.
is controlled by long life low maintenance vacuum
switches or vacuum contactors (for voltages less
Each capacitor is individually fused with 40kA
current limiting fuses. Fuses are equipped with
blown fuse indicators.
to accept NEMA standard single hole or two hole
An exhaust fan(s)
is provided for forced ventilation of the enclosure.
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.
Interlock system that dictates safe operation
and entry into the harmonic filter bank.
Fuse Detection System
Various blown fuse detection systems are provided
by NEPSI. Based on NEPSI's experience, the most
suitable and cost effective system will be recommended
and supplied by NEPSI.
control power transformer is provided for protection,
control and operation of the filter bank.
Ground and Phase Bus
A 1/4" X 2" Tin plated ground bus
is provided through the width of the enclosure
to assist in grounding during maintenance. All
phase bus is Tin plated and rated at a minimum
of 135% of the bank nominal current rating.
Harmonic Filter Bank Controller
Filter stages are automatically controlled by
one of a variety of controllers that can switch
stages on an off based upon current, var load,
power factor, temperature, time-of-day, metering
pulses, or voltage.
On/Off/Auto switches are standard with stage
on and off indicators. Controls prevent re-energization
of a filter stage in less than 5-minutes. Standard
lock-out controls prevent higher frequency tuned
filters from coming on-line before lower frequency
tuned filters. Enclosure lights are provided
in the control, main-incoming fuse, and capacitor
compartments. A convenience outlet is provided
in the control compartment.
replacement on the switch and capacitors. See
NEPSI's standard warranty statement for more
Harmonic Filter Bank
metal-enclosed harmonic 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;
Voltage Automatic Harmonic Filter Bank Preliminary
Cost, Dimensions, and Weights webpage
This webpage provides budgetary pricing, dimensions,
and weights on a cross section of NEPSI filter
bank offering. For banks not listed, contact
Voltages or Bank Configurations Not Listed,
- Typical Three-Line Diagram. Number of Stages,
Ratings, & Specific Bank Configuration &
Components are Dependent Upon Voltage
Rating, Harmonic Loading, Tuning Requirements,
and Customer Requirements
Northeast Power Systems, Inc.
66 Carey Road
Queensbury, New York 12804
Copyright © 1999
- 2009 Northeast Power Systems, Inc.