Pole Mounted Harmonic Filter Banks

NEPSI’s MVPTFä (Medium Voltage Pole Top Filter Bank) is designed for utility, industrial, and commercial power systems requiring harmonic filtering.

Product Benefits

• Decreased voltage and current distortion.
• Compliance with IEEE 519.
• Avoidance of power factor penalties and KVA demand charges.
• Improved voltage profile and loss reduction.
• Low real-estate usage
• Low cost option as compared to pad mounted gear.

Product Features

• Filter bank voltages of 2.4kV to 35kV.
• Kvar ratings from 150 kvar to 7500 kvar.
• Multiple stages and various control arrangements available.

Application
The MVPTF™ is designed for three phase utility distribution feeders and medium voltage supply entrances to commercial and industrial power systems. It is an economical alternative to pad mounted filter bank gear where space is not available.

Specifications

Filter Bank Rack
All-welded all-aluminum channel construction for mounting between two standard utility class wooden poles.

Capacitors
The filter bank consists of low loss, all film double bushing capacitors, with integral discharge resistors mounted in stainless-steel tanks. The capacitors are finished with a light-gray finish and meet or exceed the latest applicable ANSI and IEEE standards.

The capacitor’s voltage ratings are increased for harmonic filter duty with the following considerations:

• Harmonic current peaks have a 100% coincidence.
• Nominal System over-voltage of 5%.
• Ambient voltage distortion equal to the limits set forth by IEEE 519.
• Adherence to IEEE/ANSI peak and RMS voltage ratings.

Fault Current Rating
Capacitors have a 10,000 amp fault current handling capability.

Ambient
Operation within the -46C to 46C ambient temperature range.

Reactors
The MVPTFä is supplied with single phase air core reactors that are designed and tested in accordance with IEC 289-1988.  The  reactors are encapsulated with glass fibers and weather proof synthetic resin. 

The reactor currents are based on computer simulations when sufficient data for analysis is provided.  Otherwise, currents are based on 140% of the fundamental current rating of the filter bank.

Switches
The filter banks are switched by long life, low maintenance vacuum switches that meet or exceed rigorous industry standards. The switches are constructed with a high-performance vacuum interrupter that is housed in a heavy-duty corrosion-resistant, gray epoxy primed and polyurethane painted steel tank.  

Continuous current ratings and voltage ratings are dependent upon bank size and voltage.

The switches can be manually operated with a hook stick or electrically switched with a variety of automatic control options.  The options are described on the following pages.

Warranty
5 year replacement on the rack and 1 year replacement on the capacitors and reactors.  Optional extended warranties available on request.

Miscellaneous Construction Accessories
The balance of materials necessary to install the MVPTF™ can be supplied by NEPSI. Most of these materials are listed below.

Cross Arm/Cross Arm Brace
An industry standard cross arm and cross arm brace can be supplied for the overhead line when tapping from and existing overhead distribution line.

Insulators
American National Standard low voltage pin-type insulators, line-post, tie-top, and vertical-clamp-top insulators are available for holding conductors in place on cross-arms.

Control Power Transformer
An outdoor control transformer can be provided to supply control power to the filter bank switches and switching controls. The control power transformer can also provide the voltage sensing required by the optional voltage, power factor,  and var controllers.

Voltage and Current Monitoring Insulator
This insulator provides a voltage and current signal for the optional voltage, power factor, and var controllers. 

Automatic Control
The following control options are available as standard from NEPSI.  Other, more custom control options can be provided on special request.

·         On/Off Time Delay Control
 Standard package is supplied with an On/Off/Auto switch with a built in time delay to prevent energization of a charged filter bank.  Other control options are available.

·         Power Factor Controller
 Turns the MVPTFÔ into an automatic filter bank that switches based on power factor.  This option is most suitable for commercial and industrial facilities that are billed on a KVA basis or penalized for a poor power factor.

·         Current Controller
Provides switching control based on current level through a current monitoring insulator.  This control option is typically chosen by utilities.

·         Temperature Controller
Provides switching control based on temperature.  This control option is typically utilized by utilities supplying power to distribution feeders that have a high concentration of air-conditioning load.

·         Time Controller
Time controller provides filter bank switching control based on time and day of week.

·         Voltage Controller
Voltage controller provides control based on voltage.  Typically utilized by utilities for voltage control on long heavily loaded feeders.

·         Var Controllers
Provides switching control based on var demand.  Typically used by utilities.

·         Pulse Control
Provides switching control based on KY/KZ/KYZ pulses from standard utility meters.

Protection

Blown Fuse Detection System
This system will detect a blown fuse and send an alarm signal to a control center or provide a visual or audible signal at the filter bank.

Cutouts
Cross Arm mounted cutouts (fuses) can be provided for overload and short circuit protection.  They also provide a visible load-break disconnecting means for safety during maintenance.

Surge Arresters
Properly rated heavy duty distribution class surge arresters can be provided to protect the filter bank from damaging voltage surges from direct or nearby lightning strikes.

Ordering Guide

The MVPTFä can be quoted by developing a part number based on the suffixes in Table 1 and the part number guide on the following page.

Part Number Guide

For example, a 1200 kvar, 13.2 kV three phase pole mounted filter bank with a power factor controller, loadbreak cutouts, surge arresters, tuned to the 4.9^th harmonic, with a 5^th harmonic current rating of 60 amps and a 7^th harmonic current rating of 25 amps would have the following part number: 

NEPSI PART NUMBER:  MVPTF13.2/1200/1/PFC/LBC/SA/
Tuning Frequency 4.9^th
5^th Harmonic Current: 60 amps
7^th Harmonic Current: 25 amps

The drawing above shows a typical layout of a single step MVPTF™. All materials shown can be supplied as part of an equipment package.  Doubled tuned and two stages units will have reactors stacked. Banks with more than two stages require an additional pole.

MVPTC Dimensions

Notes:

1)       All dimensions are in feet and are approximate.

2)       Double-tuned and two stage units have the same width dimension.  Height dimension will increase by approximately four feet.

3)       The number of capacitors per shown will change depending upon kvar requirements.

4)       Triple and quadruple tuned banks and 3 to 4 stage units will require and additional pole, and the width dimension will approximately double.

Northeast Power Systems, Inc.
66 Carey Road
Queensbury, New York 12804
Phone: 518-792-4776
Fax: 518-792-5767

E-mail: sales@nepsi.com
Website: www.nepsi.com

Copyright © 1999 - 2009 Northeast Power Systems, Inc.