Voltage Regulators

Voltage regulator

The alternative to grid-expansion

Step voltage regulators can improve the utility's return on investment by increasing demand at off-peak periods and, with certain accessories, even reduce the peak demand load. This translates into improved revenue for the utility company while also improving the quality of service to the customer.

Transformers Magazine Interview, April 2021

Interview with Tilo Else, Siemens Energy's Vice President for Distribution Transformers

The energy market is rapidly evolving with the energy transition as one of the most fundamental changes: What challenges does this rapidly changing energy landscape pose for customers?

Please click on the link to read the complete interview
Technology and Benefits

Voltage regulator: the alternative to grid-expansion

Our voltage regulators are a cost-saving alternative to grid-expansion, as they can be easily installed and integrated into existing grid structures. We offer flexible regulation models for optimum operation.

The standard voltage regulator provides approximately 10% adjustment. However, in some designs, regulations of 15% and 20% are also available. Available at 50 or 60 Hz, their ratings are calculated according to the voltage level of the transformer they are connected to (i.e., 10%). Voltage level ratings for 1-phase voltage regulators vary between 2.5kV and 19.9 kV and between  76.2kVA and 1110kVA. 3-phase units are available at 13.2kV, 34.5kV, or from 500kVA up to 4,000kVA.

  • Cost-saving alternative to grid expansion
  • Easily integrated into existing grid structure
  • Easy installation
  • Extensive regulating range
  • Flexible regulation models for optimum operation
Portfolio

Voltage regulators for all needs

Siemens invented the voltage regulator in 1932. Voltage Regulators are highly reliable soutions for stabilizing voltage fluctions in the customer's grid 24/7. They are notably more cost-effective for customers compared to other oprions. Voltage regulators come in 1-phase or 3-phase models. Different cooling systems are available. They can be applied to any electrical system to improve voltage quality. The standard voltage regulator provides approximately 10% adjustment. However, in some designs, regulations of 15% and 20% are also available. Available at 50 or 60 Hz, their ratings are calculated according to the voltage level of the transformer they are connected to (i.e., 10%). Voltage level ratings for 1-phase voltage regulators vary between 2.5kV and 19.9 kV and between 31.8kVA and 889kVA. 3-phase units are available at 13.2kV, 34.5kV, or from 500kVA up to 4,000kVA.

JFR and SFR medium-voltage voltage regulators

When it comes to voltage regulation, Siemens Energy provides technology that serves the customer. Our manufacturing experience for voltage regulators and controls is unsurpassed in the industry. Today, Siemens Energy has the largest quantity of regulators installed worldwide. The type JFR has been an industry leader since 1936. It is a single-phase 5/8% step regulator utilizing the Siemens Energy type MJ4 or MJ6 control panel or adaptable to any control panel.

  • Electrostatically-applied polyester paint provides greater resistance to corrosion in harsh environments.
  • Type-316 stainless steel external hardware to eliminate rust and galling.
  • Sealed tank has pressure relief device to vent gases produced during tap changes. The Siemens 55°C rise regulators can be loaded to up to 12 percent above nameplate rating, with the 65°C insulation system.
  • External metal-oxide varistor (MOV) bypass arrester provides superior protection to the regulator series winding from surge and system transients.
  • Oil-sight gauge allows oil levels and oil conditions to be checked without de-energizing the regulator.
  • Motor capacitor installed in the control cabinet allows replacement without bypassing and transitioning the regulator out of service.
  • Polarized disconnect switch (PDS) facilitates easy control installation of change out without taking the regulator out of service.
  • Cover-mounted terminal block provides easier access to wiring by eliminating the need to go under the oil to change tap connections.
  • Monitor and automatically control output voltage through the use of state-of-the-art microprocessor control panels MJ-6.
  • High-creep bushings provide a minimum creep distance of 17" (432 mm).
  • Oil-drain valve includes an oil sampling valve for easy access.
  • Platform base is equipped with provisions to securely attach regulator to sub-base assembly.
  • Remote mounting cables 15' to 50' (4.5 m to 15.2 m)
  • Substation bases
  • Lightning arrester
  • Bird guards
  • Auxiliary potential transformer
  • Auxiliary current transformer
  • Bypass switches

Options include:

  • Stainless-steel tank
  • Esther fluid
  • Padmount design
  • +/- 20% regulation
  • Heated cabinet
  • Lightning arresters.

External modifications line terminals:

  • Special ground pads/connectors
  • Lowered control enclosure
  • Special ultra-creep bushings
  • Thermometers or fans (if possible)
  • Special drain valves
  • Nameplate changes/modifications.

Internal modifications:

  • Source-side potential transformer
  • Special current transformer.
Maximum design voltage kV 

Withstand voltage levels lightning impulse (BIL) kV

Load current A

kVA

Catalog number

2.5
60
400
100
10-02.5-100.0
2.5
60
668
167
10-02.5-167.0
2.5
60

1,000

250

10-02.5-250.0

2.5
60
1,332
333

10-02.5-333.0

2.5
60
1,665

416.3

11-02.5-416.3

7.6

95

100

76.2

10-07.6-076.2

7.6

95

150
114.3
10-07.6-114.3
7.6
95 
219

167

10-07.6-167.0

7.6
95 
328
250
10-07.6-250.0
7.6
95 
438
333

10-07.6-333.0

7.6
95 

548

416.3

10-07.6-416.3

7.6
95 

656

500

10-07.6-500.0

7.6
95 
668

509

10-07.6-509.0
7.6
95 
875

667

10-07.6-667.0
7.6
95 

1,093

833

10-07.6-833.0

7.6
95 
1,167
889

10-07.6-889.0

7.6

95

1,456

1,110

11-07.6-1110.0

14.4

150

100

144

10-14.4-144.0

14.4

150

200

288

10-14.4-288.0

14.4

150

300

432

10-14.4-432.0

14.4

150

400

576

10-14.4-576.0
14.4

150

578

833

10-14.4-833.0

19.9

150

50

100

10-19.9-100.0
19.9
150

100

200

10-19.9-200.0

19.9
150
200

400

10-19.9-400.0
19.9
150

335

667

10-19.9-667.0
19.9

150

418

833

11-19.9-833.0

Ratings for 60 Hz applications

The Siemens Energy padmount voltage regulator offers a new dimension to underground system planning and design that preserves an aesthetically pleasing environment. Maintaining all of the functionality of a traditional regulator, the padmount voltage regulator promotes safety because there are no exposed high-voltage lines. Additionally, the tamper-resistant, secured cabinet design protects the access to components including the drain valve, bushings and cover bolts. The layout and positioning of the controls is on the narrow end of the box, which allows for additional placement options and smaller operational space requirements. The controls are ergonomically positioned for easy access for operators. The bushing connections and sample valve reside in the lower enclosure. With the Siemens Energy padmount voltage regulator, safety and reliability are enhanced, construction costs are reduced, and land requirements are smaller for a more attractive physical profile for the public.

The type SFR is a vertically integrated, three-phase regulator, which also comes with the capability of separating the tap changer. This significantly increases the life of the regulator. Siemens Energy offers distinct advantages with all of our three-phase regulators engineered and manufactured in-house. Our expertise in both technology and service gives us additional advantages in the custom engineering necessary for most three-phase regulator applications. The SFR voltage regulator has proven its reliability and durability in the toughest environments. Unit construction, tough exterior coating and a side inspection door are just a few of the time-tested features of today’s SFR. Additionally, Siemens Energy offers the popular SFR-X which features a separate tap-changing mechanism compartment allowing for easy inspection and maintenance. Separating the regulator tap-changer significantly increases the life of the regulator by eliminating arcing in the main tank containing the coil and core.

Features include:

  • Magnetic-temperature indicator
  • Pressure-relief device
  • Lightning-arrester brackets
  • Magnetic-type, liquid-level indicator
  • Magnetic-type temperature indicator
  • Special bushings
  • MR tap-changer option (SFR-MR)
  • Customized controls
  • Special CT/PT
  • Station class arresters
  • Separate tap changer compartment (available with  SFR-X and SFR-MR).
  • Liquid-temperature indicator with or without alarm
  • Pressure-relief gauge with or without alarm.
Maximum design voltage kV 

Withstand voltage levels lightning impulse (BIL) kV

Load current A

kVA

Catalog number

ONAN/ONAF 

5.0
75
346
300
40-5.0-0300

ONAN

5.0
75
866
750
40-5.0-0750

ONAN

13.2
95 or 110

219

500

40-13.2-0500

ONAN

13.2
95 or 110
328
750
40-13.2-0750

ONAN

13.2
95 or 110
437
1,000
40-13.2-1000

ONAN

13.2
95 or 110
656
1,500

40-13.2-1500

ONAN

13.2
95 or 110
874
2,000
40-13.2-2000

ONAN

13.2
95 or 110
1,093

2,500

40-13.2-2500

ONAN

13.2
95 or 110
1,300
2,972
40-13.2-2972

ONAN

13.2
95 or 110
274
625

41-13.2-0625

ONAF

13.2
95 or 110

410

937

41-13.2-0937

ONAF

13.2
95 or 110
546
1,250
41-13.2-1250

ONAF

13.2
95 or 110
874

2,000

41-13.2-2000

ONAF

13.2
95 or 110
1,166

2,667

41-13.2-2667

ONAF

13.2
95 or 110
1,458
3,333

41-13.2-3333

ONAF

13.2
95 or 110
1,750
4,000
41-13.2-4000

ONAF

34.5

200 

84

500

40-34.5-0500

ONAN

34.5

200 

167

1,000

40-34.5-1000

ONAN

34.5

200 

251

1,500

40-34.5-1500

ONAN

34.5

200 

335

2,000

40-34.5-2000

ONAN

34.5

200 

105

625

41-34.5-0625

ONAF

34.5

200 

209

1,250

41-34.5-1250

ONAF

34.5

200 

335

2,000

41-34.5-2000

ONAF

34.5

200 

446

2,667

41-34.5-2667

ONAF

Ratings for 60 Hz applications

Bushing Style
Nominal system voltage
Basic lightning impulse level
Maximum line-to-ground voltage
Rated current
Connection to transformer
Dry withstand
Wet withstand
Wet switching impulse
Minimum creepage
Minimum arcing distance (AD)
Maximum altitude
 
kV
kV
kV
A
 
kV
kV
kV
in (mm)
in (mm)
ft (m)
STARON 150-25-800 E21
25
150
16
800
Draw Lead
60
50
NA
30.7 (780)
9.25 (235)
3300 (1000)
STARON 150-25-1200 E21
25
150
16
1200
Split conductor
60
50
NA
30.7 (780)
9.25 (235)
3300 (1000)
STARON 150-25-2000 E21
25
150
16
2000
Bottom
60
50
NA
30.7 (780)
9.25 (235)
3300 (1000)
STARON 150-25-3000 E21
25
150
16
3000
Bottom
60
50
NA
30.7 (780)
9.25 (235)
3300 (1000)
STARON 200-34.5-800 E21
34.5
200
22
800
Draw Lead
80
75
NA
44.1 (1120)
13.38 (340)
3300 (1000)
STARON 200-34.5-1200 E21
34.5
200
22
1200
Split conductor
80
75
NA
44.1 (1120)
13.38 (340)
3300 (1000)
STARON 200-34.5-2000 E21
34.5
200
22
2000
Bottom
80
75
NA
44.1 (1120)
13.38 (340)
3300 (1000)
STARON 200-34.5-3000 E21
34.5
200
22
3000
Bottom
80
75
NA
44.1 (1120)
13.38 (340)
3300 (1000)
STARON 350-69-800 E21
69
350
44
800
Draw Lead
160
140
NA
88.5 (2248)
23.62 (600)
3300 (1000)
STARON 350-69-1200 E21
69
350
44
1200
Split conductor
160
140
NA
88.5 (2248)
23.62 (600)
3300 (1000)
STARON 350-69-2000 E21
69
350
44
2000
Bottom
160
140
NA
88.5 (2248)
24 (610)
3300 (1000)
STARON 350-69-3000 E21
69
350
44
3000
Bottom
160
140
NA
88.5 (2248)
24 (610)
3300 (1000)
STARON 550-115-800 E23
115
550
88
800
Draw Lead
260
230
NA
150.1 (3813)
41.34 (1050)
3300 (1000)
STARON 550-115-1200 E23
115
550
88
1200
Split conductor
260
230
NA
150.1 (3813)
41.34 (1050)
3300 (1000)
STARON 550-115-2000 E23
115
550
88
2000
Bottom
260
230
NA
150.1 (3813)
41.34 (1050)
3300 (1000)
STARON 550-115-3000 E23
115
550
88
3000
Bottom
260
230
NA
150.1 (3813)
41.34 (1050)
3300 (1000)
STARON 650-138-800 E23
138
650
102
800
Draw Lead
310
275
NA
177 (4495)
49.21 (1250)
3300 (1000)
STARON 650-138-1200 E23
138
650
102
1200
Split conductor
310
275
NA
177 (4495)
49.21 (1250)
3300 (1000)
STARON 650-138-2000 E23
138
650
102
2000
Bottom
310
275
NA
177 (4495)
49.21 (1250)
3300 (1000)
STARON 650-138-3000 E23
138
650
102
3000
Bottom
310
275
NA
177 (4495)
49.21 (1250)
3300 (1000)
STARON 750-161-800 E23
161
750
146
800
Draw Lead
365
315
NA
207.5 (5270)
57.48 (1460)
3300 (1000)
STARON 750-161-1200 E23
161
750
146
1200
Split conductor
365
315
NA
207.5 (5270)
57.48 (1460)
3300 (1000)
STARON 750-161-2000 E23
161
750
146
2000
Bottom
365
315
NA
207.5 (5270)
57.48 (1460)
3300 (1000)
STARON 750-161-3000 E23
161
750
146
3000
Bottom
365
315
NA
207.5 (5270)
57.48 (1460)
3300 (1000)
STARON 900-230-800 E23
230
900
146
800
Draw Lead
425
350
NA
299.3 (7603)
84.645 (2150)
3300 (1000)
STARON 900-230-1200 E23
230
900
146
1200
Split conductor
425
350
NA
299.3 (7603)
84.645 (2150)
3300 (1000)
STARON 900-230-2000 E23
230
900
146
2000
Bottom
425
350
NA
299.3 (7603)
84.645 (2150)
3300 (1000)
STARON 900-230-3000 E23
230
900
146
2000
Bottom
425
350
NA
299.3 (7603)
84.645 (2150)
3300 (1000)
STARON 1175-345-800 E23
345
1175
220
800
Draw Lead
520
NA
825
384.3 (9760)
94.5 (2400)
3300 (1000)
STARON 1175-345-2000 E23
345
1175
220
2000
Bottom
520
NA
825
384.3 (9760)
94.5 (2400)
3300 (1000)
STARON 1175-345-3000 E23
345
1175
220
3000
Bottom
520
NA
825
384.3 (9760)
94.5 (2400)
3300 (1000)
STARON 1675-500-800 E23
500
1675
318
800
Draw Lead
750
NA
1175
703.3 (17864)
149.6 (3800)
3300 (1000)
STARON 1675-500-2000 E23
500
1675
318
2000
Bottom
750
NA
1175
703.3 (17864)
149.6 (3800)
3300 (1000)
STARON 1675-500-3000 E23
500
1675
318
3000
Bottom
750
NA
1175
703.3 (17864)
149.6 (3800)
3300 (1000)
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