Voltage Regulators
Howard Industries, Inc.
ISO-9001 Certied
Distribution Transformer Division
INTRODUCTION
Howard Industries’ SVR-1 single-phase
step voltage regulators are tap-changing
autotransformers designed to automatically regulate distribution line voltages in
a range of plus or minus 10% in thirty-two
steps of approximately 5/8% each. The
following ratings are available:
• Voltage: 2500 Volts (60 kV BIL)
through 19920 Volts (150 kV BIL)
• Current: 50 through 1665 Amps
• KVA: 38.1 through 1000
• Frequency: 50 or 60 Hertz
Internal potential winding taps and/or
an external ratio correction transformer
are provided on all ratings so that each
regulator may be applied within a range
of system voltages.
Catalog Section
Single-Phase Step
28-10
Voltage Regulators
A digital control system automatically
operates the tap changer mechanism to
maintain system voltage within desired
limits. The control system is externally
programmable to allow precise setting of
control limits and provides sophisticated
capabilities for special control requirements, communication, and data logging.
Overhead type voltage regulators are
supplied with support brackets for pole
mounting and have bolt-down provisions
for pad-mounted applications. Substation
type voltage regulators are provided with
rectangular substation bases. Elevating
platforms are available as an option.
SVR-1 voltage regulators are designed for
reliable operation and ease of maintenance and are supplied with a full array of
standard features for routine applications.
Optional accessories are available to accommodate special applications.
FIGURE 1: SVR-1 single-phase voltage regulator
Document No. 2.4.132
Revision: 0
Issued: October, 2011
Copyright © 2011 Howard Industries, Inc.
1
Howard Industries, Inc.
Laurel, MS 39440
www.howardtransformers.com
28-10
SVR-1 Single-Phase Step Voltage Regulators
The SVR-1 features sealed-tank
construction and a 65°C rise insulation
system, which allows 55°C rise rated
designs to provide an additional 12%
capacity above nameplate rating
without loss of normal insulation
life. The HI-AMP™ feature provides
capability for additional load capacity,
as long as the regulator’s maximum
current rating is not exceeded.
The regulator’s complete internal
assembly (including tap-changer
switch, motor, core-and-coil assembly,
and reactor coil-and-coil assembly) is
mounted to the cover (Figure 2). This
construction simplies removal of
the internal assembly for inspection,
maintenance, and repair.
FIGURE 2: Internal Assembly
_______________________________
SVR-1 voltage regulators are designed,
manufactured, and tested in
accordance with the requirements of
ANSI Standard C57.15.
STANDARD REGULATOR FEATURES
All SVR-1 voltage regulators are
supplied with the following standard
accessories and features:
• Gear-driven tap-changer switch with
motor and power supply
• Motor capacitor mounted in control
enclosure for ease of replacement
• Mechanical tap position indicator
with externally adjustable HI-AMP™
limit switches
• Laser-etched nameplates (two)
• Lifting lugs
• Oil drain valve with sampling device
• Upper lter press connection
• Oil sight gauge
• High-creep porcelain bushings
• Bolt-down provisions (overhead type
regulators)
• Pole mounting brackets (overhead
type regulators)
• Rectangular substation base
(substation type regulators)
• Externally mounted series arrester
(MOV type)
• Mounting provisions for shunt
arresters
• Automatic pressure relief device
• Powder coated mild steel tank, cover,
clamp ring, and control enclosure
• HI/ICMI UVR-1 digital regulator
control (refer to description below)
OPTIONS
The following optional features and
accessories are available for the SVR-1
voltage regulator:
• Externally mounted shunt arresters
(MOV type)
• Wildlife protection for high-voltage
bushing terminals and lightning
arresters
• Extra-length control cable
• PTs and CTs for external metering
• Elevating platform
• Control enclosure heater
• 4-hole NEMA H-spade connectors
• Cooling fans
• Powder coated stainless steel
tank, cover, clamp ring, and control
enclosure
• HI/ICMI USC-1 simplied regulator
control
• Beckwith digital regulator control
• SEL digital regulator control
HI/ICMI UVR-1 CONTROL
The HI/ICMI UVR-1 digital regulator
control (Figure 3) has the following
standard features and options:
• Digital processing and nonvolatile
ash technology data storage with
Motorola 32-bit processor
• Mil-spec modular design with Mil-std
I-46085 conformal coated circuit
boards
• Solid-state tap-changer relays
• Corrosion resistant panel/shield
• Bright white/blue LCD high-visibility
display
• Super-bright LED indicators, including
High Band, In Band, Low Band, High
Limit, Low Limit, Voltage Reduction,
Reverse Power, Neutral Position, and
Alert
• DNP 3.0 Level 2, report-by-exception
communications protocol with ACS
worldwide certication
• Multiple, interoperable
communications ports, including
RS-232, IEEE-485 two and four-wire,
front panel serial program port, ber
optic interface, ethernet capable,
TCP/IP (optional), Bluetooth wireless
(optional), and eight-port input/output
board (optional)
• Certications: radio frequency
interference withstand capability per
ANSI/IEEE C37.90.2, electrostatic
(continued on Page 4)
FIGURE 3: HI/ICMI UVR-1 Control
Howard Industries, Inc.
Laurel, MS 39440
www.howardtransformers.com
Copyright © 2011 Howard Industries, Inc.
2
Document No. 2.4.132
Revision: 0
Issued: October, 2011
SVR-1 Single-Phase Step Voltage Regulators
Series arrester (MOV)
28-10
High-voltage terminals (3)
High-voltage bushings (3)
Cover-mounted terminal
block enclosure
™
HI-AMP
lower limit
switch (hidden)
Automatic
pressure relief device
Tap position indicator
Oil level sight gauge
Control cable
Control enclosure
Laser-engraved nameplate
(mounted on control
enclosure)
Internal assembly
lifting eyes (2)
™
HI-AMP
upper limit switch
Upper lter press and
oil ll connection
Shunt arrester mounting
provisions (3)
Regulator lifting lugs
(2 or 4)
KVA label
Pole mounting brackets (2)
Drain valve and oil
sampling device
FIGURE 4: SVR-1 single-phase step voltage regulator standard features and accessories (overhead type as shown)
Document No. 2.4.132
Revision: 0
Issued: October, 2011
Copyright © 2011 Howard Industries, Inc.
3
Laser-engraved nameplate
(tank-mounted)
Tank grounding provisions
(2)
Bolt-down provisions (4)
Howard Industries, Inc.
Laurel, MS 39440
www.howardtransformers.com
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