Three phase servo voltage stabilizer are automatic line Voltage corrector using synchronous motor in close loop control. The stabilizer employ continuously variable auto transformer, buck-boost transformer, AC synchronous motor, state of the art IC closed loop control system with all protection, metering, indication and control system to give desired output voltage within the specified limits for a range of input voltages. Provision for manual correction of voltage can also be provided.
Parameter | Single Phase Unit | Three Phase Unit |
Rating | 2 KVA to 50 KVA | 6 KVA to 2000 KVA |
Input Voltage Range | a) 207V – 280V b) 180V – 280V c) 160V – 280V d) 140V – 280V |
a) 360V – 470V b) 340V – 470V c) 300V – 470V d) 250V – 470V |
Nominal Output Voltage | 230V | 400V |
Output Voltage Accuracy | ± 1% | ± 1% |
Line Frequency Variation | 47Hz-53Hz | 47Hz-53Hz |
Effect of Power Factor | None | None |
Wave Form Distortion | None added | None added |
Control | Digital/Analogue | Digital/Analogue |
Response Time | 10 ms. | 10 ms. |
Voltage Correction Rate Air Cooled Oil Cooled |
25V / Sec. 15V/ Sec |
40V / Sec 25V / Sec. |
LCD Display (20 x 2 matrix) | Date & Time, Input Voltage, Output Voltage & Current | |
Log Book Memory (Non-volatile) | No. of Hrs. of operation on mains. Peak Current demand. Nos. of Abnormal High Voltage cut-off events. Nos. of Abnormal Low Voltage cut-off events. No. of Hrs. of operation on DG. |
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Programmable Features(Through 2-parallel way resettable passwords) | HV cut-off set. LV cut-off set. O/L trip set. Time delay set Operating mode (auto/manual) |
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Cooling: 1. Air Cooled 2. Oil Cooled |
2 KVA to 40 KVA & above 5 KVA to 1000 KVA & above |
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Efficiency | 97% | |
Protection | a) Automatic Switch-Off against: · Under / Over-Voltage · Over-Load & Short – Circuit · Single Phasing |
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Surge Protection | Class C Type Secondary Surge Protection |