Howard SVR1 Regulator User Manual
Switch-Pad™ SVR-1 Step Voltage Regulator
Instructions
Installation, Operation, and Maintenance
of SVR-1 Step Voltage Regulators
Howard Industries, Inc.
ISO-9001 Certied
Document No. 2.4.114
Revision: 03
Issued: March, 2012
Copyright © 2012 Howard Industries, Inc.
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Document 2.4.114SVR-1 Step Voltage Regulator
READ THIS IMPORTANT SAFETY INFORMATION
Read these instructions carefully and become familiar with the equipment before proceeding with
installation, operation, or maintenance activities. This equipment contains extremely hazardous
voltages. To prevent death, serious personal injury, or equipment damage, all information in these
instructions should be read and observed. Safe use of this equipment is dependent on proper
installation, operation, and maintenance procedures.
Certain information in this manual is marked with the words DANGER, WARNING, or CAUTION, which
indicate hazards.
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or
serious personal injury, and damage to the equipment.
WARNING indicates a potentially hazardous situation which, if not avoided, may result in death or
serious personal injury, and/or damage to the equipment.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate personal injury, and/or damage to the equipment.
No one should attempt to service or perform maintenance activities on the equipment until it has
been effectively de-energized, and all high-voltage and low-voltage bushing terminals have been
properly grounded. Only qualied personnel should install, maintain, and operate this equipment.
Qualied personnel are those who are trained in the installation, maintenance, and operation
of high-voltage equipment, trained in the proper use of personal protective equipment (such as
rubber gloves, safety glasses, protective clothing, hard hats, etc.) and trained in appropriate rst aid
procedures.
The instructions contained herein are intended to be a general guide for the installation, operation
and maintenance of this equipment, when operated in “Usual Service Conditions” as dened in IEEE
Standard C57.15. Features presented herein may not be present in all equipment designs. Standard
and optional features are subject to change without notice.
Although efforts have been made to ensure accuracy and completeness, these instructions do
not address every conceivable application or circumstance that might be encountered. Howard
Industries makes no representation or warranty with respect to, and assumes no responsibility for
the completeness, accuracy, sufciency, or usefulness of, these instructions.
Questions regarding installation, operation, and maintenance of the equipment, particularly when
encountering unusual or special circumstances that may not be sufciently covered by these
instructions, should be directed to the Howard Industries Transformer Division.
These instructions do not cover operation or maintenance of the regulator control unit. Users should
refer to the control manual for information specic to the control unit.
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Copyright © 2012 Howard Industries, Inc.
Document No. 2.4.114
Issued: March, 2012
Revision: 03
Switch-Pad™ SVR-1 Step Voltage Regulator
TAblE OF CONTENTS
Receiving Inspection, Storage, and Handling .......................................................................................................................... 4
Receiving Inspection ............................................................................................................................................................ 4
Handling ................................................................................................................................................................................ 4
Storage .................................................................................................................................................................................. 4
Installation .................................................................................................................................................................................. 5
Introduction .......................................................................................................................................................................... 5
Pre-Installation Checklist ..................................................................................................................................................... 5
Installation Location ............................................................................................................................................................. 6
Mounting ............................................................................................................................................................................... 6
High-Voltage and Grounding Connections .......................................................................................................................... 6
Control Connections ............................................................................................................................................................. 7
Bypass Surge Arrester .......................................................................................................................................................... 7
Lightning Protection ............................................................................................................................................................. 7
Through Fault ........................................................................................................................................................................ 7
50 Hertz Operation .............................................................................................................................................................. 7
Placing a Regulator in Service ................................................................................................................................................. 10
Procedure ............................................................................................................................................................................ 10
Checking for Proper Operation .......................................................................................................................................... 11
Removing a Regulator from Service ...................................................................................................................................... 12
Procedure ........................................................................................................................................................................... 12
Returning a Regulator to Service .................................................................................................................................... 12
Maintenance ........................................................................................................................................................................... 13
General Instructions .......................................................................................................................................................... 13
Operational Checks ........................................................................................................................................................... 13
Insulation Fluid ................................................................................................................................................................... 14
Internal Inspection ............................................................................................................................................................. 14
Vacuum Oil Fill Process ........................................................................................................................................................15
Cooling Fans ....................................................................................................................................................................... 15
External Parts List ................................................................................................................................................................ 16-17
lIST OF FIGURES
Figure 1: Recommended method for lifting regulator ....................................................................................................... 4
Figure 2: Typical regulator nameplate ................................................................................................................................ 5
Figure 3: Cover-mounted terminal block ............................................................................................................................. 6
Figure 4: SVR-1 step voltage regulator .............................................................................................................................. 8
Figure 5: Connection diagram, one SVR-1 regulator in a single-phase system ............................................................... 9
Figure 6: Connection diagram, two SVR-1 regulators in an open delta three-phase system .......................................... 9
Figure 7: Connection diagram, three SVR-1 regulators wye connected in a three-phase four-wire system ................... 9
Figure 8: Connection diagram, three SVR-1 regulators delta connected in a three-phase three-wire system
Figure 9: HI-AMP™ switches .............................................................................................................................................. 10
Figure 10: Connector terminal strip (CTS) ........................................................................................................................ 14
Figure 11: Recommended lifting method for untanking regulator internal assembly .................................................. 15
Figure 12: External parts view ........................................................................................................................................... 16
Document No. 2.4.114
Revision: 03
Issued: March, 2012
Copyright © 2012 Howard Industries, Inc.
........................ 9
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RECEIVING INSPECTION, STORAGE, AND HANDlING
RECEIVING INSPECTION
Immediately upon receipt the regulator should be
carefully inspected for evidence of shipping damage.
The shipping manifest should be checked to make sure
all listed materials have been received. Any damage or
material discrepancies should be noted on the shipping
manifest and a claim should be immediately led with the
freight carrier. Discrepancies should also be brought to
the attention of the Howard Industries Regulator Division.
HANDlING
The regulator can be moved using the lifting lugs on the
sides of the tank and a suitably rated lifting sling. Use of
a spreader bar is also recommended. Figure 1 illustrates
the recommended method for lifting the regulator using
a spreader bar. Do not use the cover-mounted ling eyes
for lifting the entire regulator. Cover-mounted lifting eyes
are to be used only for untanking the internal assembly.
A properly palletized regulator can also be lifted using a
forklift truck or pallet jack having the necessary weight
handling capacity. Refer to the regulator nameplate for
the unit’s weight to determine the suitability of a lifting
device.
Document 2.4.114SVR-1 Step Voltage Regulator
STORAGE
The regulator should be stored in a manner that will
prevent damage. The control cabinet door should be
closed and latched.
WARNING
Falling equipment can cause death, serious personal
injury, or property damage. When lifting the entire
regulator, the tank-mounted lifting lugs must be used.
Do not use the cover-mounted lifting eyes to lift the
entire regulator. Doing so may cause the cover to
fracture or separate completely from the regulator.
Cover-mounted lifting eyes should be used only for
untanking the internal assembly.
FIGURE 1: Recommended method for lifting regulator
using spreader bar
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Copyright © 2012 Howard Industries, Inc.
Document No. 2.4.114
Revision: 03
Issued: March, 2012
Switch-Pad™ SVR-1 Step Voltage Regulator
INSTAllATION
INTRODUCTION
An SVR-1 regulator can regulate the voltage on a singlephase circuit or one phase of a delta- or wye-connected
three-phase circuit as described below and as illustrated
in the connection diagrams on page 9.
One SVR-1 regulator in a single-phase application
Three SVR-1 regulators connected in a grounded wye
conguration on a four-wire three-phase system
Three SVR-1 regulators connected in a delta
conguration on an ungrounded three-wire threephase system
Two SVR-1 regulators connected in an open delta
conguration on an ungrounded three-phase system
WARNING
Due to the possibility of neutral shift, three SVR-1
regulators should not be connected together in an
ungrounded, wye-connected, three-wire, three-phase
system.
PRE-INSTAllATION CHECklIST
Before connecting the regulator, the following checks
should be made:
1. Check the oil level sight gauge for proper oil level (top
oil level visible in gauge). Add ASTM D-3487 Type 2
oil, if the level is found to be low. Check for visible
signs of oil leaks.
2. Measure the dielectric strength of the oil per ASTM
D-877. If found to be below 24 kV, the oil should be
ltered and retested (NOTE: This test is not necessary
if the regulator is being installed immediately after
receipt from the factory.)
3. Measure power factor from each bushing terminal
to tank ground. The reading should be less than 2.0
percent.
4. Inspect the porcelain bushings for damage or signs
of oil leaks. If it is suspected that moisture may have
entered the regulator, test the oil per ASTM D-3487
(Type 2). A positive indication for moisture will require
that the regulator be dried and the oil ltered before
placing into service.
FIGURE 2: Typical regulator nameplate
5. Inspect the by-pass arrester (and shunt arresters, if
present) for damage. Damaged arresters should be
replaced with new arresters of the same voltage rating.
6. Refer to the nameplate (Figure 2) and conrm that
the regulator is connected for the proper output voltage, motor voltage, and control panel voltage. If not,
follow the procedure on pages 6 and 7 to make the
necessary connections.
7. Make absolutely sure that the regulator tap changer
is in the neutral tap position. This can be accomplished by observing that both of the following
conditions have been met: 1) The pointer on the tap
position indicator is pointing to “zero,” and 2) the
neutral indicator is continuously illuminated. (The
control panel can be powered from a 120 Volt external source.)
Document No. 2.4.114
Revision: 03
Issued: March, 2012
Copyright © 2012 Howard Industries, Inc.
5
INSTAllATION (Continued)
INSTAllATION lOCATION
SVR-1 regulators are designed for outdoor applications.
Regulators with hanger brackets can be mounted on
utility poles of the proper weight-bearing class. Regulators
supplied with substation bases can be pedestal mounted.
In addition, any regulator can be platform mounted. For
pedestal-mounted substation applications, pedestal
height should be determined by the user to raise the
regulator’s cover-mounted high-voltage connections to a
safe elevation according to applicable codes and utility
installation practices.
DANGER
Document 2.4.114SVR-1 Step Voltage Regulator
When the regulator is energized, extremely dangerous
high voltage is present at the cover-mounted bushing
terminals and at the terminals of the lightning
arresters. Physical contact with or proximity to these
terminals without proper protection will cause death
or serious personal injury, and property damage.
The regulator should be de-energized and properly
grounded before servicing.
MOUNTING
SVR-1 regulators are suitable for mounting on a utility
pole, crossarm platform , or pedestal (optional accessory). Regulators are supplied with either pole-mounting
brackets or station platform base according to the regulator’s capacity rating. Refer to page 4 for handling instructions.
An optional pedestal can be supplied for substation
installations requiring a specic safe clearance below
live terminals. Pedestals are available from the factory in
4-inch height increments, with heights ranging from 21
inches to 49 inches. Regulators should be elevated to
provide adequate vertical clearance to live high-voltage
parts on the regulator cover.
FIGURE 3: Cover-mounted terminal block
1. Identify the “S”, “L”, and “SL” bushings by referring to
the designations embossed on the regulator cover.
The “SL” bushing should be the rst bushing connected. Then connect the “S” bushing to the source
and the “L” bushing to the load. Standard bushing
terminals for the SVR-1 are provided as indicated in
the following table and are suitable for connection
to copper or aluminum conductor. Clamp-type connectors are supplied for nameplate current ratings
through 668 Amps.
150 Amps & below: #8 to 4/0 clamp connector
151–300 Amps:
301–668 Amps:
669–1200 Amps:
1201–2000 Amps: 1-1/2—12 UNF-2A with 4-hole
2. Ground the regulator using the ground provisions
located at the base of the tank. Keep ground leads
as short and direct as possible.
#2 to 477 kCM clamp connector
#2 to 800 kCM clamp connector
1-1/8—12 UNF-2A with 4-hole
spade-9.5 mm (0.375 in) minimum
thickness
spade-12.7 mm (0.5 in) minimum
thickness
Regulator control units can be mounted on the regulator
tank or at a remote point, using an optional extendedlength control cable.
HIGH-VOlTAGE AND GROUND CONNECTIONS
Connect the regulator to the high-voltage system using
the following procedure. Refer to the appropriate connection diagram on page 9 (Figure 5, 6, 7 or 8).
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Copyright © 2012 Howard Industries, Inc.
DANGER
It is unsafe to service ungrounded or improperly
grounded equipment. Contact or proximity to energized
equipment will cause death or severe personal injury,
and property damage.
Document No. 2.4.114
Revision: 03
Issued: March, 2012
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