S Energy, Inc.

E T TR, Voltage Regulator Business Segment

P.O. Box 6289

Jackson, MS 39288-3289

Phone: 601.939.0550

Fax: 601.932.9911

Website: http://www.usa.siemens.com/energy/voltageregulators

Guideform Specifications – Voltage Regulators

A.  Single Phase (JFR) Voltage Regulators

1.0  General

1.1  This specification covers electrical, mechanical and safety features and characteristics of outdoor, single phase, oil immersed, 50 or 60 Hz, 55/65oC temperature rise by resistance, self cooled and force-air cooled step-type voltage regulators. The voltage regulators must be completely self-contained and provide +/- 10% voltage regulation in thirty-two (32) steps of 5/8% each.

1.2  The voltage regulator furnished under this specification shall be designed and manufactured in accordance with ANSI standard C57.15, latest revision. This standard shall be a part of this specification.

1.3  Voltage regulator rating(s) and operating voltage(s) shall be specified on the inquiry. Unless stated otherwise the Voltage Regulator units will set on the below underlined factory default taps. Taps of operation are as follows:

Table 1
Regulator Voltage Ratings
Voltage Rating / Standard Internal Tap Settings
60Hz
2,500V / 2,500 / 2,400
7,620V / 8,000 / 7,970 / 7,620 / 7,200 / 6,930 / 4,800 / 4,160 / 2,400
13,800V / 13,800 / 13,200 / 12,470 / 12,000 / 7,970 / 7,620 / 7,200 / 6,930
14,400V / 14,400 / 13,800 / 13,200 / 12,000 / 7,970 / 7,620 / 7,200 / 6,930
19,920V / 19,920 / 17,200 / 16,000 / 15,242 / 14,400 / 7,970 / 7,620 / 7,200
34,500V / 34,500 / 19,920
50Hz
6,600V / 6,930 / 6,600 / 6,350 / 6,000 / 5,500
11,000V / 11,600 / 11,000 / 10,000 / 6,930 / 6,600 / 6,350 / 6,000 / 5,500
15,000V / 15,000 / 14,400 / 13,800 / 13,200 / 12,000 / 11,000 / 10,000 / 8,660
22,000V / 23,000 / 22,000 / 20,000 / 19,100 / 15,000 / 12,700 / 11,000 / 10,000

1.4  The voltage regulator shall be furnished with ANSI Type II mineral oil per ASTM D-3487. The oil shall contain less than 1 part per million PCB’s at the time of manufacture and this shall be stated on the voltage regulator nameplate.

2.0  Construction

2.1  The voltage regulators shall be designed such that they can be partially or completely untanked for inspection and maintenance without disconnecting any internal electrical or mechanical connections. After the unit is untanked, it shall be possible to operate the voltage regulator mechanism and test the control panel from an external 120 volt source without any reconnections between the control and the regulator.

2.2  The tap changing mechanism shall be of the motor driven, quick break type and shall be completely oil immersed.

2.3  The voltage regulator shall be of sealed-tank design and construction to permit operation at 65oC rise without increasing the oxidation rate of the oil.

2.4  The voltage regulator shall be supplied with a pressure-relief device, which vents at approximately 4 psig.

2.5  All voltage regulators shall have the tap changer motor capacitor mounted inside the control enclosure.

2.6  The external parts of the tank and control enclosure shall be painted ANSI #70 gray. The voltage regulator shall be powder coat painted to comply with ANSI C57.12.31.

2.7  The voltage regulators external hardware is to be stainless steel.

2.8  Core and coil assembly to be provided with patterned epoxy-coated insulation paper with a minimum of two sheets of insulation between all series and exciting winding layers.

3.0  Standard External Accessories

3.1  The terminal block shall not be under oil inside the tank. The terminal block shall be externally located with a removable gasketed cover for easy accessibility.

3.2  A single polarized jack plug should be provided. The plug shall automatically short the current transformer when disconnecting the supply.

3.3  The BIL (basic impulse level) of the bushings shall be compatible with the BIL of the voltage regulator and all bushings shall have a minimum creep distance of 17 inches. The bushing designations (S, L, SL) shall be stamped or embossed on the voltage regulator cover adjacent to the bushings. The S, L, and SL bushings must be interchangeable with each other.

3.4  The voltage regulators shall be equipped with line terminals per the following criteria:

Table 2: Line Terminals
Nameplate Line
Current Rating / Conductor Size Range
Or Threaded Size Range
50A to 300A / #2 to 477 MCM
301A to 668A / #2 to 800 MCM
669A to 1200A / 1.125-12 UNF-2A
1201A to 2000 A / 1.500-12 UNF-2A

3.5  All voltage regulators shall be provided with an external metal oxide varistor (MOV) bypass arrester connected across the series winding.

3.6  An external oil sight gauge shall be provided which indicates oil level at 25oC ambient and oil color.

3.7  An external position indicator, which is mounted above the oil level of the voltage regulator, shall be included to indicate the tap changer position. The position indicator shall be furnished with reflecting numbers and a plexiglass face plate and shall be slanted at a 45-degree angle for ease of reading when the voltage regulator is pole mounted.

3.8  Voltage regulators rated 668 amps and below shall include the VARI-AMP feature which will permit additional current carrying capabilities at reduced voltage regulation as shown in the table below, but not to exceed 668 amps. The VARI-AMP adjustment shall be located inside the position indicator faceplate.

Table 3: Regulation
Regulation (percent) / Current (percent of 55oC rating)
+/- 10.0 / 100
+/- 8.75 / 110
+/- 7.50 / 120
+/- 6.25 / 135
+/- 5.00 / 160

3.9  Mounting bosses shall be provided for the addition of lightning arresters to the source (S), load (L), and source-load (SL) bushings. Mounting bosses shall be fully welded around their circumference. Spot welding will not be acceptable.

3.10  All voltage regulators shall be furnished with an oil-sampling valve.

3.11  Voltage regulators rated 250 kVA and below shall be pole-mounted and provided with welded-on hanger brackets. Voltage regulators rated 167 kVA and above shall be provided with a base suitable for securing them to a pad or elevating structure. All voltage regulators must be capable of being secured to an elevating structure.

3.12  Every voltage regulator shall be provided with two laser-etched nameplates. One nameplate will be mounted on the control enclosure and the other mounted on the voltage regulator tank.

4.0  Optional Voltage Regulator Accessories

4.1  Remote Mounting Kit. Please specify at time of request. Extra length control cable shall be provided for remote mounting of the control cabinet for location at the base of the pole.

4.2  Adjustable steel elevating structures (sub-bases) to raise the voltage regulator to meet safe operating clearances from ground to the lowest live part.

5.0  Testing

All voltage regulators shall be tested in accordance with the latest ANSI C57.15 standards. Standard tests to include:

·  Resistance measurements of all windings

·  Ratio tests

·  Polarity test

·  No load loss at rated voltage and rated frequency

·  Excitation current at rated voltage and rated frequency

·  Impedance and load loss at rated current and rated frequency

·  Applied Potential

·  Induced Potential

·  Insulation power factor test

·  Standard Voltage Impulse Testing (BIL)

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October 2008 ● © 2008 Siemens Energy, Inc.