Howard SVR1 Regulator - Manual (Page 6)

Document 2.4.114 SVR-1 Step Voltage Regulator
Copyright © 2012 Howard Industries, Inc. Document No. 2.4.114
Revision: 03
Issued: March, 2012
6
INSTAllATION (Continued)
MOUNTING
SVR-1 regulators are suitable for mounting on a utility
pole, crossarm platform , or pedestal (optional acces-
sory). Regulators are supplied with either pole-mounting
brackets or station platform base according to the regula-
tor’s capacity rating. Refer to page 4 for handling instruc-
tions.
An optional pedestal can be supplied for substation
installations requiring a specific 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.
Regulator control units can be mounted on the regulator
tank or at a remote point, using an optional extended-
length control cable.
HIGH-VOlTAGE AND GROUND CONNECTIONS
Connect the regulator to the high-voltage system using
the following procedure. Refer to the appropriate connec-
tion diagram on page 9 (Figure 5, 6, 7 or 8).
1. Identify the “S”, “L”, and “SL” bushings by referring to
the designations embossed on the regulator cover.
The “SL” bushing should be the first bushing con-
nected. 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 con-
nectors are supplied for nameplate current ratings
through 668 Amps.
150 Amps & below: #8 to 4/0 clamp connector
151–300 Amps: #2 to 477 kCM clamp connector
301–668 Amps: #2 to 800 kCM clamp connector
669–1200 Amps: 1-1/8—12 UNF-2A with 4-hole
spade-9.5 mm (0.375 in) minimum
thickness
1201–2000 Amps: 1-1/2—12 UNF-2A with 4-hole
spade-12.7 mm (0.5 in) minimum
thickness
2. Ground the regulator using the ground provisions
located at the base of the tank. Keep ground leads
as short and direct as possible.
FIGURE 3: Cover-mounted terminal block
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
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.
DANGER
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.