Howard Voltage Regulators User Manual

Howard Industries, Inc.

ISO-9001 Certied

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 simplies 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 simplied 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 certication

• 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)

• Certications: 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