SFR medium-voltage voltage regulators

5.0-34.5 kV
  • Rated short-time withstand current 25 times rated current

  • Rated continuous current 218-2,000 A

  • Lightning impulse (BIL) 75-200 kV

Medium-voltage voltage regulators, type SFR 

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.

 

The step-type voltage regulator takes an incoming voltage that will vary with load conditions and maintains a constant

output voltage. As the loading increases along the distribution feeder, the voltage will drop. This reduction in voltage

reduces the amount of power used by the lighting portion of the load. By increasing the voltage to this load, additional power is consumed. This increased power translates into increased revenue for the utility company. The same principle can

work for the utility company when it needs to reduce the voltage by a predetermined amount, thus reducing the overall power demand and delaying capital investments to meet peak demand.

 

Siemens provides a full range of ratings for most system voltages and current applications; manufacturing everything

from the smallest single-phase pole mount unit to large substation regulators.

 

When it comes to voltage regulation, Siemens provides technology that serves the customer. Our manufacturing

experience for voltage regulators and controls is unsurpassed in the industry. Today, Siemens has the largest quantity

of regulators installed worldwide.

 

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 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 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.

Medium-voltage voltage regulators, type SFR

Features

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).

 

Options include:

  • Liquid-temperature indicator with or without alarm
  • Pressure-relief gauge with or without alarm.

Ratings for 60 Hz applications

Maximum design voltage kV  
Withstand voltage levels lightning impulse (BIL) kV
Load current A
kVA
Catalog number
ONAN/ONAF1
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

Footnote:

  1. ONAN denotes oil normal, air normal cooling. ONAF denotes oil normal, air forced cooling.