Reguladores

Voltage Regulators
Electrical Apparatus

Single-Phase Step
GENERAL
McGraw-Edison® VR-32 single-phase step voltage regulators are tap-changing autotransformers. They regulate distribution line voltages from 10% raise (boost) to 10% lower (buck) in thirty-two steps of approximately 5/8% each. Voltage ratings are available from 2400 volts (60 kV BIL) to 34,500 volts (200 kV BIL) for 60 Hz and50 Hz systems. Internal potential winding taps and an external ratio correction transformer are provided on all ratings so that each regulator may be applied to more than one system voltage. Smaller kVA sizes are supplied with support lugs for pole mounting and with substation or platform tie down provisions. Larger sizes are provided with substation bases with padmounting provisions. Voltage ismaintained within desired limits by controls that feature superior accuracy, reliability, and serviceability. Continuity of service is assured by rugged, service-proven tap changers and core-and-coil assemblies functioning with the control. McGraw-Edison voltage regulators are available with a full complement of standard features for routine applications, as well as a full line of optionalaccessories for unique applications. In addition, the regulator offers desirable features that enhance operation and service.

225-10

STANDARD FEATURES
A sealed-tank construction allows the use of 65°C rise insulation system in 55°C rise rated designs to provide an additional 12% capacity above the nameplate rating without loss of normal insulation life. Additional load capacity is stated on thenameplate, this ADD-AMP™ feature is available as long as the tap changer’s maximum current rating is not exceeded. The unit construction cover suspends the internal assembly consisting of the core-and-coil assembly, tap changer, and the reactor for ease of inspection and maintenance.

Figure 1. VR-32 Voltage Regulator with CL-5C control.

All McGraw-Edison regulators are manufactured and tested tothe ANSI Standard C57.15.

June 1998 • Supersedes 01/98
Printed in U.S.A.

1

Single-Phase Step

MOV-TYPE SERIES ARRESTER

INTERNAL ASSEMBLY LIFTING EYES CLAMP-TYPE TERMINALS THREADED-STUD BUSHING TERMINALS

JUNCTION BOX BUSHINGS COVER HANDHOLE COVER POSITION INDICATOR GROUNDING STRAP AUTOMATIC PRESSURE RELIEF DEVICE UPPER FILTER PRESS CONNECTION SHUNT ARRESTER MOUNTING BOSSES (3)BALL-TYPE OIL SIGHT GAUGE REGULATOR LIFTING LUGS CONTROL CABLE (Disconnectable)

POLE-TYPE MOUNTING BRACKETS

LASER-ETCHED NAMEPLATES (2) (SECOND ON CONTROL ENCLOSURE DOOR)

CONTROL CABLE STABILIZING BOSS CONTROL ENCLOSURE

PANEL-TYPE RADIATORS

GROUND BOSSES (2)

BOLT-DOWN PROVISIONS (4)

DRAIN VALVE & OIL SAMPLING DEVICE

Figure 2. VR-32 Voltage Regulator.

2

225-10STANDARD FEATURES
s s s s s s s s s s s s s s s s s s s

CL-2A control Tap changer with motor and power supply Position indicator with ADD-AMP adjustment Two laser-etched nameplates Lifting lugs Oil drain valve and sampling device Upper filter press connection Oil sight gauge Mounting provisions for shunt arresters High-creep bushings with clamptype terminals Bolt-down provisions (overhead units)Pole-type mounting brackets (overhead units) Substation base (substation units) External series arrester Automatic pressure relief device Handhole Control cabinet with removable front panel Ratio correction transformer Conformally coated circuit boards

ARRESTERS Series Surge Arresters
All VR-32 Voltage Regulators are equipped with a bypass arrester connected across the series winding between thesource (S) and load (L) bushings. This bypass arrester limits the voltage developed across the series winding during lightning strikes, switching surges and line faults. A MOV type series surge arrester of 3 kV offers series winding protection on all regulators except those rated 33000 V, which have a 6 kV MOVtype series surge arrester.

Shunt Arresters
A shunt arrester is an optional...