Servokon Systems Limited
Kanpur, Kanpur Nagar, Uttar Pradesh
GST No. 09AABCS2570D1ZK
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| S.No. | HT AVR/Built In AVR | Transformer with OLTC |
| 1. | Voltage control is entirely step less, thereby providing close tolerance on the desired output. | Voltage control is in discrete steps and the available would be dependent on step voltage. |
| 2. | The mechanical movement of the regulator is very simple and consists of chain drive, which moves the roller carrying carrier board. Hence the periodic maintenance is very simple. | The mechanical movement is relatively complex, comprising of Geneva Operating mechanism, spring-changing system and so on. Maintenance is complicated and can be done by professional only. |
| 3. | Preventive maintenance necessitates change of carbon rollers only as this being the only moving component undergoing wear and tear. Replacement cost and process is low and easy. | Number of moving components is more i.e. moving contacts, fixed contacts, gear trains, transition resistors and many more. Hence the wear and tear is much frequent and maintenance process is costly and can be done by professional only. |
| 4. | Output voltage of AVR remains constant at any connected load and upto full load. | Output voltage of transformer drop down under load conditions from rated No-Load voltage depending upon the percentage regulation of the respective unit and percentage of load |
| 5. | The movement of the roller on the winding of the regulators is at low voltage and does not cause sparking and subsequently there is no contamination of transformer oil. Saving oil maintenance cost. | The mechanical movement causes sparking on every tap changing as OLTC is fitted on high voltage winding causing oil to carbonize and leading to acidity. In due course, the entire OLTC oil has to be changed periodically, which is expensive and time consuming. |
| 6. | Life of equipment is high because of stepless nature and smooth control and can be further increased by simply changing inexpensive carbon rollers after prolonged operation and period. | Life of conventional "OLTC" manufactured in India is 1,00,000 operations on "No-Load" which is reduced to 40%-50% on “On-Load” conditions. Replacement cost is high and time consuming. |
| 7. | Can be placed anywhere on the feeder line. | Can be placed only on the receiving end. |
| 8. | Externally fitted, Step Synchronous drive motor is used. Making it easier to service without much hassle. | Shaded pole motor is used, fitted inside the housing. Maintenance is much more complicated and time consuming |