Howard Voltage Regulators User Manual

Howard Industries, Inc.
ISO-9001 Certied
Distribution Transformer Division
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
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Howard Industries, Inc.
Laurel, MS 39440
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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
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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
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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)
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Laser-engraved nameplate (tank-mounted)
Tank grounding provisions (2) Bolt-down provisions (4)
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SVR-1 Single-Phase Step Voltage Regulators
discharge withstand capability per IEC 61000-4-2 (1995-2001), oscillatory surge and fast transient surge withstand capabilities per ANSI C37.90.1 (2002), metering accuracy per IEEE C57.15 of 0.3% from -40°C to +85°C (excluding VT/CT errors)
• User-friendly scrolling control navigation with complete menu chart (minimizes obsolescence)
• Comprehensive controller programs on CD-ROM including Quick Start, Control Congure, DNP Point Congure, Data Log, Tap Contact Log, and Program Loader, with customer upgradeable expansion capability
• Front panel serial port
• Comprehensive control self-test capability and protection safeguards
• Front panel controls including automatic/manual motor control switch, manual raise/lower switch, drag-hand reset switch, local/remote control switch, and internal/external voltage source switch
• Panel-mounted fuses
• External voltage source terminals
• Voltage test terminals
• Line drop compensation R, X
• Temperature controller with settable levels for high and low temperature,
-40°C to +85°C
• Sequential and time-integrating regulation algorithms
• Reverse power capability without need for internal potential transformer
• Multiple modes of operation including Locked Forward, Locked Reverse, Idle Reverse, Bi-directional, Neutral Reverse, and Co-generation
• Adjustable high and low-voltage limits with automatic runback (rst house protection)
REGULATOR CONSTRUCTION
SVR-1 regulators are designed and built to provide reliable service, long life, and ease of maintenance. The entire internal assembly is mounted to the regulator cover and can be easily removed for inspection, repair, and
maintenance.
Tank
SVR-1 regulators feature sealed-tank construction to prevent moisture and air from entering the internal environment. Tanks are constructed of mild steel or stainless steel and electrostatically coated with a tough polyester powder nish.
Core and Coil Assembly
The use of a 65°C rise insulation system in 55°C rated designs provides an extra 12% capacity for the SVR-1 regulator without loss of insulation life.
The series coil is wound with full­width aluminum strip conductor and compression-bonded thermoset­adhesive insulation paper to provide exceptional protection from potentially damaging through-fault conditions.
Cores are manufactured from high quality grain-oriented silicon steel. Laminations are cut and assembled using a distributed-gap process to produce a low reluctance joint. A sturdy clamping assembly effectively secures the core and coils.
FIGURE 5: Tap changer mechanism
FIGURE 6: Tap position indicator
Tap Changer
All SVR-1 regulators feature rugged gear-driven tap changers (Figure 5). The tap-changing mechanism and current-carrying contacts are designed to provide exceptional reliability and long service life exceeding one million mechanical operations. The tap changer uses an electric motor, gear train, and spring drive to provide quick, reliable operation. The switch is mechanically coupled to the external tap position indicator (Figure 6) to provide visual indication of the switch position.
Tap Position Indicator
The tap position indicator (Figure
6) is located on the cover-mounted terminal block enclosure and is directly connected to the tap changer by a exible drive shaft. The indicator dial plate is marked in 32 steps, 16 each on the RAISE and LOWER segments of the dial. The “zero” mark designates the neutral position. Drag hands follow the pointer and indicate the pointer’s maximum and minimum positions since the last reset. Drag hands can be reset using the drag hand reset switch on the front panel of the control unit. HI-AMP™ limit switches are mounted on either side of the position indicator.
HI-AMP™ Feature
The HI-AMP™ Feature allows SVR-1 regulators to handle increased current capacity by reducing the regulation
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SVR-1 Single-Phase Step Voltage Regulators
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range. This is accomplished by setting the raise (boost) and lower (buck) limit switches (Figure 7) located on the tap position indicator to prevent the tap changer from traveling above or below the desired settings. Scales on the limit switches are graduated in percent regulation, including 5%, 6-1/4%m 7-1/2%, 8-3/4% and 10% regulation settings. Table 2 (Page 7) lists the load current and regulation ranges available with the HI-AMP™ feature. At each setting, a detent stop provides positive adjustment. Upper and lower limits need not be the same.
Upper and lower limits can also be implemented with the digital control unit.
SURGE ARRESTERS
Series Arrester
Each SVR-1 regulator is equipped with an appropriately sized MOV-type surge arrester connected between the source and load bushings (Figure 4). This series arrester (also known as a bypass arrester) is provided to protect the series winding of the regulator from damage due to line surges, such as can result from lightning, switching surges, and line faults. The series arrester alone does not provide complete lightning protection. For more complete protection, option shunt arresters should be installed.
Shunt Arresters
MOV surge arresters are available as an option on the SVR-1 regulator to provide protection for the shunt winding. Shunt arresters are mounted on the regulator tank adjacent to the load bushing and the source bushing. Each arrester is connected between the bushing terminal and ground.
FIGURE 7: HI-AMP™ limit switches (one located on each side of tap position indicator)
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Howard Industries, Inc.
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Table 1:
Load Current and KVA Ratings, 60 Hz
Voltage
(kV)
2.5 kV
60 kV BIL
5.0 kV
75 kV BIL
7.62 kV
95 kV BIL
13.8 kV
95 kVBIL
14.4 kV
150 kV BIL
19.92 kV
150 kV BIL
Load Current
(Amperes)
200 300 400 500
668 1000 1332 1665
100
150 200 250 334 500 668 833
50
75 100 150 219 328 438 546 656 875
1093
50
100 150 200 300 400 483 604
50
100 200 231 300 400 463 578
50
100 167 200 335 418 502
SVR-1 Single-Phase Step Voltage Regulators
kVA
50
75 100 125 167 250 333 416
50
75 100 125 167 250 333 416
38
57
76 114 167 250 333 416 500 667 833
69
138 207 276 414 552 667 833
72
144 288 333 432 576 667 833 100 200 333 400 667 833
1000
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SVR-1 Single-Phase Step Voltage Regulators
Table 2:
HI-AMP™ Capabilities, 60 Hz
Rated
Volts
2.5 kV
5.0 kV
7.62 kV
13.8 kV
14.4 kV
19.92 kV
Rated
kVA
50
75 100 125 167 250 333 416
50
75 100 125 167 250 333 416
38.1
57.2
76.2
114.3 167 250 333 416 500 667 833
69 138 207 276 414 552 667 833
72 144 288 333 432 576 667 833
50 100 200 333 400 667 833
±10% ±8-3/4% ±7-1/2% ±6-1/4% ±5%
200 300 400 500
668 1000 1332 1665
100
150
200 250 334 500 668
2
2
2
2
2
2
2
2
2
2
2
833
50/53
75/79 100/106 150/159 219/232 328/347 438/464 548/580 656/668 875/926
1093/1157
50
100 150 200 300 400 483 604
50
100 200 231 300 400 463 578
25
50 100 167 200 335 418
220 330 440 550
668 1000 1332 1665
110
165 220 275 367 550 668 833
55/58
83/88 110/116 165/175 241/255 361/382 482/510 603/638
668
875/926
1093/1157
55
110 165 220 330 440 531 664
55
110 220 254 330 440 509 636
28
55 110 184 220 369 460
Load Current (Amperes)
Regulator Range
240 360 480 600
668 1000 1332 1665
120
180 240 300 401 600 668 833
60/63
90/95 120/127 180/190 263/278 394/417 526/557 658/668
668
875/926
1093/1157
60
120 180 240 360 480 580 668
60
120 240 277 360 480 556 668
30
60 120 200 240 402 502
1
270
405
540
668
668 1000 1332 1665
135
203 270 336 451 668 668 833
68/72
101/95 135/143 203/215 296/313 443/469 591/625
668 668
875/926
1093/1157
68
135
203
270
405
540
652
668
68
135 270 312 405 540
625
668
34
68 135 225 270 452 564
28-10
320 480 640 668
668 1000 1332 1665
160
240 320 400 534 668 668 833
80/85 120/127 160/169 240/254 350/370 525/556
668 668 668
875/926
1093/1157
80
160 240 320 480 640 668 668
80
160 320 370 480 640 668 668
40
80 160 267 320 536 668
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SVR-1 Single-Phase Step Voltage Regulators
Catalog Section 28-10
Document 2.4.132, Revision 0, October, 2011
Copyright © 2011 Howard Industries, Inc.
Laurel, Mississippi
Telephone: 601-425-3151
Fax: 601-649-8090
E-mail: mkt@howard.com
Web: howardtransformers.com
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