Download Part 7 - Ground Switch

Medium Voltage Power Factor Correction Equipment Specifications
Metal-Enclosed and Pad-Mounted Type
Part 1 - General Scope and Product Description
1.0 This specification contains the minimum design and manufacture requirements,
standards, general equipment type, warranty and installation for power factor correction
equipment. Equipment shall be intended for the improvement of power factor, for
medium voltage (2.4-34.5kv), AC electrical power distribution systems.
1.1 Exception to any part of this specification shall be indicated by reference to each
item number, when providing a project bid.
1.2 Manufacturer of power factor correction equipment shall have been engaged in the
application, design and production of such equipment for a minimum of twenty years.
Manufacturer specified shall be ISO 9001 certified. The finished product shall be
engineered, assembled, tested, and shipped by manufacturer. Equipment provided in
any other manner is not acceptable.
1.3 Power factor correction equipment shall be suitable, in general, for three phase, 3wire, three phase 4-wire, grounded wye, ungrounded wye, or delta wire systems at 60
Hz. Equipment is designed for reliable, continuous operation in ambient temperatures
of –5 C to + 40 C, up to 3300 feet (1000 meters) above sea level, with relative
humidity of 70% at 20 C or higher, when controlled by thermostats, conditioned air,
heaters and/or fans, as required.
1.4 A power system analysis may be required to determine the harmonic content and
requirement for filters, as part of the power factor correction equipment. It will be the
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responsibility of the owner, consultant, contractor or power quality service company to
provide the manufacturer, at the time of request for quote, such data.
1.5 In general, the capacitor bank shall consist of an incoming section and a capactior
section(s) to meet the desired application ratings shown below:

Nominal System Voltage (Kv):
_______________

Maximum System Voltage (Kv):
_______________

System BIL (Kv: _______________

Three Phase Short Circuit Rating at Capacitor: ______________

Capacitor Bank (RMS Symmetrical Amps): _______________

Line-Ground Short Circuit Rating at Capacitor: ______________

Wire/Grounding Configuration:______________

Bank (RMS Symmetrical Amps): _______________

Total kvar:________________

Number of Steps:_____________

Rated Power (step size):___________

Capacitor Bank or Detuned Filter or Tuned Filter Type: ______________

Enclosure Type (NEMA 1, NEMA 12, NEMA 3R, other): ______________
Part 2 - Standards and References
2.0 American National Standards Institute (ANSI)
2.1 Institute of Electrical and Electronic Engineers (IEEE)
2.2 National Electrical Manufacturers Association (NEMA)
2.3 Underwriters Laboratories, Inc. (UL)
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2.4 National Electrical Code (NEC)
2.5 Canadian Standards Association (CSA)
2.6 International Electrotechnical Commission (IEC)
Part 3 – Enclosure Construction
3.0 The capacitor assembly shall consist of a single compartmentalized enclosure with
a NEMA rated construction that will house all components, including capacitors, fuses,
switches and other associated controls and components. The assembly shall provide
personnel access from the front of the enclosure and rear of the enclosure, where
applicable. Electrical connections shall be bottom entry.
3.1 Enclosure fabrication and construction will utilize galvanized 12 and 14-gauge, cold
rolled sheet steel (stainless steel or aluminum optional). All seams shall be welded and
ground smooth for proper appearance. The roof shall allow for water shed (outdoor
equipment) and allow for optional roof bushings for top entry connections. C4 structural
steel channel base for entire assembly and steel lifting plates shall be integral in the
construction. Paint color to be ANSI 61 gray standard, other colors optional. Enclosures
shall provide an aesthetic appearance with long lasting corrosion and weather resistant
powder paint finish. Ventilation louvers shall be located on the front of the enclosure
and shall be backed with stainless steel mesh for outdoor enclosures. Overall design of
the enclosure shall be tamper resistant. Lifting lugs shall be included to facilitate
handling and installation.
3.2 Doors shall provide adequate entry access to the equipment and include door
stops; doors to be removable. Stainless steel hinges and hinge pins, and 3-point
latching handles shall be provided, with pad-lockable handles.
3.3 Key interlocks shall be incorporated as part of a personnel safety system and to
prevent unauthorized entry into the capacitor bank. The keyed interlock system shall
allow all doors to be opened at one time. The interlock scheme shall include the
upstream protective device (where applicable) and all doors for entry into disconnect
switch/circuit breaker, ground switch, capacitors (where applicable).
3.4 Where applicable, environmental controls including thermostatically controlled strip
heaters shall be supplied in all non-ventilated compartments. A thermostatically
controlled fan(s) shall be provided as part of the capactior bank.
3.5 Capacitor banks shall be neatly constructed and finished, meeting all Arteche PQ
quality and production control standards.
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Part 4 – Capacitors
4.0 The capacitor bank shall be equipped with all-film, low loss, single phase capacitors
with one or two bushings, or three-phase capacitors utilizing three bushings. The power
capacitors shall consist of welded stainless steel construction with non-PCB dielectric
fluid. The capacitors shall be designed, manufactured, and tested to meet and/or
exceed all applicable NEMA and ANSI/IEEE standards. Each capacitor shall contain an
internal discharge resistor to reduce the stored voltage to 50 volts or less within 5
minutes from disconnection.
4.1 The capacitors shall be located in a separate compartment from the main incoming
disconnect switch/ fuse or circuit breaker.
4.2 Individual capacitors shall be mounted either horizontally or vertically.
capacitors shall be removable from the front of the enclosure.
The
Part 5 - Capacitor Protection, Fusing
5.0 Each capacitor shall be protected by a non-expulsion current limiting fuse that is
equipped with a blown fuse indicator and can be visible and accessible from the front of
the enclosure. The individual capacitor fuses shall be firmly mounted either directly to
the top of the capacitor bushings or main bus.
Part 6 - Disconnect Switch
6.0 The capacitor bank shall be supplied with a three-pole, load break disconnect
switch and offer a visible disconnect means of the capacitor bank. The switch shall be
rated at 135% of the banks nominal current rating and shall have a 40kA RMS
momentary asymmetrical rating. The switch shall be interlocked with the vacuum
switches for prevention of being in the open position, when the capacitor stages are
energized.
6.1 The disconnect switch shall be located in a separate compartment that is isolated
from the capacitor compartment and the low voltage control compartment.
6.2 The bank shall be equipped with (optional) main incoming current limiting fuses.
Fuses shall be current limiting, non-expulsion type and provide short circuit protection
for an individual step or for the complete capacitor bank. The fuses shall be located on
the load side of the main disconnect switch. They shall be accessible only when the
bank is de-energized by the disconnect switch.
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© Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications
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6.3 The capacitor bank shall be equipped with incoming line lugs only, where a
disconnect switch is not provided. The capactior bank shall be equipped with a vacuum
circuit breaker, capable to interrupt capacitive current, where required.
Part 7 - Ground Switch
7.0
An externally operated ground switch, or combination disconnect and ground
switch arrangement shall be provided to ground the load-side terminals of the
disconnect switch. The ground switch shall be pad-lockable in either the open or closed
position and utilize key interlocking, to ensure proper sequence of operation. The
ground switch shall be used as a convenient means to ensure that all stored energy has
been discharged from the capacitors and o provide for maximum safety.
Part 8 - Surge Arresters
8.0 The capacitor bank shall be equipped with heavy duty Distribution Class
surge/lightning arresters with applicable ratings. Arrestor shall be MOV type with
silicone-polymer housing.
Part 9 - Vacuum Switches
9.0 The capacitor bank switching steps shall be controlled by either single phase
electric motor or solenoid operated vacuum switches or three phase vacuum switches.
Switches shall have capacitor duty rating and provide the appropriate continuous
current and BIL ratings. The control system shall prevent the vacuum switches from
operating more than once in a pre-set time period. Vacuum switches shall be
interlocked with the capacitor bank disconnect switch and ground switch components.
Vacuum switches shall have easy access for inspection or removal.
Part 10 - Inrush Reactors
10.0 Capacitor bank steps shall be equipped with individual air-core reactors, to limit
the high frequency inrush current, from capactior step (back-to-back) switching.
Reactors shall be designed to properly coordinate with the values of fuse ratings (I2T)
and the vacuum contactors (kA x kH). The inrush reactors shall be rated for at least
135% of the switched step current.
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Part 11 - Harmonic Filters
11.0 Iron-core reactors shall be provided for tuning or de-tuning purposes where
applicable. Manufacturer requires specific application information, collected data and
analysis to determine ratings of filtering.
Part 12 – Bus System
12.0 The capacitor bank shall have a continuous horizontal main bus utilizing full rated
electrical grade copper. Bus shall feed the individual capacitor steps. A 1/4" x 2"
ground bus that spans the full width of the enclosure shall be provided. Stainless steel
bolts and washers shall be utilized and all bus supports, either epoxy resin or porcelain
type, shall withstand associated stress from short-circuit currents. Bus bar shall be
uninsulated, tin plated type and allow for the future expansion of the capacitor bank. All
conductor bus and will be capable of conduct at least 1.35 times
Part 13 - Controls
13.0 The capacitor bank shall utilize a power factor controller to automatically switch
the capacitor steps to regulate the target power factor to a preset value. Controller shall
be programmable and be door mounted, or housed in own enclosure integral to the
capacitor bank, where applicable.
13.1 All low voltage control, where applicable, shall be isolated from the high voltage
compartments. All controls shall be accessible while the bank is energized. The control
compartment shall be equipped with a swing out panel to allow access to panel
mounted controls, where applicable.
13.2 The microprocessor based device shall manage, measure, and display, at a
minimum:
- under- and overvoltage
- harmonics
- defective steps
- maintenance (loss of power and amount of operations)
- temperature measuring with fan control and switching off steps
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- digital input
- number of steps in use
- adjustable time settings of steps
- voltage (phase/phase and phase/neutral)
- current
- frequency
- active power
- reactive power
- apparent power
- THD voltage
- THD current
- harmonics for voltage (order 2nd – 31st)
- harmonics for current (order 2nd – 31st)
- counter active work import / export
- counter reactive work inductive / capacitive
- missing reactive power for target-cosphi
- temperature, measuring the temperature in the enclosure by use of sensor
- Controller shall be door mounted with a back-lighted, graphical LCD display and
function keypad
- Modbus 485 RTU option
- SCADA management option
13.3 Additional control and indication shall be available for blown fuse protection,
overload-remove step off-line, externally mounted strobe light, or specific power factor
controller device and communication, at a minimum. Any supervision functions shall
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provide for reliable, safe operation of the compensation equipment and ensure a long
life cycle of the components.
13.4 Current transformers (CT) are optional and shall be provided where applicable.
Part 14 - Testing, Safety and Documentation
14.0 Capacitors shall be tested at point of construction. The power factor correction
equipment shall be production tested for proper operation, prior to shipment. This shall
include, at a minimum: wire connections, torque connections, mechanical functional
operation, controller operation, visual inspection.
14.1 Nameplates, labels, and other decals, providing safety, general operation
instruction and manufacturer data, shall be included with the equipment. Such
markings shall be visually accessible and conveniently located both internally and
externally on the equipment.
14.2 A manual for the purpose of operation, maintenance, and service instruction shall
be included with the finished equipment. A general bill-of-material list, external and
internal outline mechanical and electrical drawings shall be included with the equipment.
Documentation shall be provided in a CAD format for approval or reference.
Part 15 - Installation and Service
15.0 Installation and operation of equipment is intended for general business,
commercial, industrial, government and energy service providers.
15.1 Correct installation is required for proper performance and function of the
equipment. Physical inspection of equipment for damage is suggested, prior to any
installation. Indoor storage shall be in a clean, dry environment.
15.2 National Electrical Code (NEC), electric utility company or service provider codes
shall be adhered to during the installation. Electrical connections shall also be in
compliance with required codes
15.3 Installer/Contractor shall inspect and verify proper alignment, anchorage, leveling
and grounding, proper connections and tightness of connections, prior to any start-up
procedures.
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15.4 Appropriate personnel shall start-up and operate equipment upon installation
approval.
15.5 All maintenance and inspection of the power factor correction equipment shall be
done with the system disconnect device in the open position.
15.6 Routine maintenance and inspections should be limited to 30 minutes (or what
shall be practical), as to not disrupt utility billing practices.
15.7 An annual inspection of the capacitors, fuses, switches and reactors shall be
performed.
Part 16 - Equipment Warranty
16.0 The manufacturer shall provide its standard warranty for equipment of this type.
The warranty shall provide for repair or replacement of the equipment, should it be
found to be defective within twelve months from the date of being first energized, or
eighteen months from date of shipment, or whichever occurs first.
Approved Manufacturer
Power factor correction equipment designer and manufacturer shall be:
Arteche PQ, Inc.
16964 W. Victor Road
New Berlin, WI 53151
www.artechepq.com
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© Arteche PQ, Inc. Metal Enclosed Capacitor Equipment Specifications
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