SVR automatic step voltage regulator is Sefon’s patented product which used to improve power quality. SVR automatic step voltage regulator automatically adjust the gear of on-load tap changer according to the condition of circuit voltage to realize the change of transformer ratio, so as to ensure that the output voltage is stable in a certain range. It can be widely used in power supply circuit with long distance of power supply, large power supply load, large voltage fluctuation and power quality can’t meet the usage standard. It can also be used in industrial and mining enterprises whose voltage quality can’t meet the production needs.

1. Structure

SVR automatic step voltage regulator consists of three parts: autotransformer, on-load tap changer and automatic controller.

2. Application field

(1). Rural power grid system

(2). The main transformer without on load voltage regulation function  in transformer substation.

(3). Mine power system
(4). Railway and highway construction site
(5). Hydroelectric power plant

3. Main technical parameter

3.1. Operating environment

 (1) Below an altitude of 2000m

 (2) Ambient temperature: Max. temperature is +40℃ and the min. temperature is -25℃

 (3) Outdoor wind speed shall not exceed 35m/s

 (4) Pollution grade: Class II

 (5) Earthquake horizontal acceleration is not greater than 3m/s2,, the vertical acceleration is not greater than 1.5m/ s2, and the safety factor is more than 1.67.

3.2. Autotransformer

 (1) Rated voltage: 6kV、10kV、22 kV、35kV

 (2) Rated capacity: 500～5000KVA(6KV)、315kVA～12500kVA(10KV)、

315 kVA～16000kVA(22KV)、500～25000KVA（35KV）

 (3) Rated frequency: 50HZ

 (4) Wiring mode: Three-phase and three-wire type single winding star wiring  

 (5) Number of tapping steps: 7 or 9;

 (6) Cooling method: Oil immersed and self cooled

(7) Range of regulation: （-10%～+10%），（-5%～+15%）or（0～+20%）optional