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 |
| H.T. Automatic Voltage Regulator | L.T. Automatic Voltage Regulator | Transformer with Builtin HT AVR |
| AVR is installed before Stepdown Transformer and stabilised HT supply is fed to the Input of the Transformer | AVR is installed before Stepdown Transformer. Fluctating HT supply is fed to the Input of the Stepdown Transformer. | Very little floor space is required as both transformer & transformer part of the in-built HT AVR is in the same tank. In fact the total saving in space is approx 80%. In comparison to separate AVR's either HT or LT & Transformer separately. |
| Since the supply of the Transformer is at Stabilised voltage, the Transformer is protected from Low/High voltage fluctation. | Since fluctating voltage is fed to the Transformer the unit will not be protected from Lower/Higher Voltage fluctuation | The total unit is so designed that the fluctuating voltage is taken care of initially by the transformer unit itself. So the question of protection due to fluctuating voltage does not arise. |
| Since the stabilised voltage is fed to the transformer, the transformer will be utilised upto it FULL rared capacity at rated voltage. | Since the Transformer is getting fluctuating supply voltage, the unit can not be utilised at its full rated capacity and the rating of the transformer will be restricted to the ratio of minimum supply voltage by rated voltage. | The total unit is so designed that the unit itself is capable of FULL power capacity within the fluctuation limit. |
| The efficiency of the Transformer will be better since it is fed with rated voltage. | The efficiency of the Transformer is lower as the Transformer is not fed with proper voltage. | The total combined efficiency is the LOWEST in comparision to HT AVR with separate transformer & LT AVR with separate transformer. |
| Separate coast of Installation is involved. | Separate coast of Installation is involved. | No separate cost of installation for AVR is involved |