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Isolation Transformers

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Isolation Transformer

“Servottam” Isolation Transformer is used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons. “Servottam” Isolation transformer provides galvanic isolation and are used to protect against electric shock, to suppress electrical noise in sensitive devices, or to transfer power between two circuits which must not be connected. A transformer sold for isolation is often built with special insulation between primary and secondary, and is specified to withstand a high voltage between windings.

“Servottam” Isolation Transformers block transmission of the DC component in signals from one circuit to the other, but allow AC components in signals to pass. Transformers that have a ratio of 1 to 1 between the primary and secondary windings are often used to protect secondary circuits and individuals from electrical shocks between energized conductors and earth ground. Suitably designed isolation transformers block interference caused by ground loops. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment such as Online UPS, computers, medical devices, or laboratory instruments, automotive components machines, imported machines etc.

“Servottam” Isolation Transformer Terminology
Sometimes the term is used to emphasize that a device is not an autotransformer whose primary and secondary circuits are connected. Power transformers with specified insulation between primary and secondary are not usually described only as "isolation transformers" unless this is their primary function. Only transformers whose primary purpose is to isolate circuits are routinely described as isolation transformers.

“Servottam” Isolation Transformer Operation
“Servottam” Isolation transformers are designed with attention to capacitive coupling between the two windings. The capacitance between primary and secondary windings would also couple AC current from the primary to the secondary. A grounded Faraday shield between the primary and the secondary greatly reduces the coupling of common-mode noise.

TECHNICAL SPECIFICATIONS - MODEL HCSAIRCLD

Rating 250 kVa, 3 Phase
Output Current 362 Amps per phase
Input Voltage Range 340V to 460V, 47 - 53Hz, 4 Wire
Output Voltage 400V +/- 1%
Duty Cycle Continuous 24x7
Cooling Natural / Forced Air Cooled
Waveform Distortion Nil
Response Time Less than 10ms
Suitability All power factor loads
Class of Insulation B Class
Breakdown Strength 1500V AC for 2 minutes.
Insulation Resistance < 50 Mega Ω at 500V DC
Additional Facility Manual Operation
Installation Indoor type
Degree of Protection IP-30
No Load Loss Less than 0.4 %
Efficiency 98-99%
Applicable Standard IS 9815
Type & Suitability
  • Unbalanced Supply and Load. Suitable for 3 phase Unbalanced/ balanced Supply & Unbalanced/Balanced Load.
  • The unit consists of 3 nos. Single phase individually AC servo motor controlled units of 1/3rd of the total capacity connected in Star configuration.
Input / Output Termination On Brass studs / Connectors.
Winding & Wiring Material Copper EC grade (99.9% Pure)
Optional Features and Protections
  • Overload Cut-Off and Short Circuit Protection.
  • Low / High Voltage (out of input range) Alarm and / or Cut-Off.
  • Single Phase Prevention Alarm and / or Cut-Off.
  • High Temperature Alarm and / or Cut-Off.
  • Reverse Phase Cut-Off.
  • Auto Phase Correction in case of Phase Reversal.
  • Spike and surge protection
  • Ammeter, Temperature Meter, Digital Ammeter, Digital Voltmeter.
  • Stabilizer By Pass System
  • Remote control of stabilizer (with wires)
  • Earth fault protection
  • Delay on Circuits
Due to new innovations & improvements the technical specifications are subject to change.
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