Home About FAQs Contact Softbitonline Jobs
Design Software Products Downloads Clients Engineering Student Photo Gallery
Click For Live Installations/Applications

Condition monitoring and control of transformers, electric motors, dg sets
Download Catalogue
SCADA software - For Windows XP

SCADA software - For Windows 7
(BlueTooth/WiFi Enabled With Remote Monitoring)

For HT Power Transformers

Following Models Are Available:
Both the below models are suitable for OLTC fitted HT Transformers. You can select a model as per your requirements. Available ex-stock.
This is 96mm x 96mm x 165mm model and can be fitted on any panel door. It can be configured through a mobile APP. Maintains the transformer volatge within set LT range. Economical and best model for smaller ratings of HT transformers uoto 1000 KVA @11kV
SAG-E44 This is SCADA enabled AVR to operate an OLTC of a HT transformer of any rating @11kV/33kV/66kV/132kV. It can be fitted on a wall or installed on floor having a concret foundation. It comes ready with all features fitted in a ABS plastic cabinet with floow mounting legs.

Buy Online WiFi Enabled AVR For OLTC
Item Description Model Payment Option

BT Enabled AVR For OLTC
Unit Price: Rs.9,500/-
GST @ 18% (Rs.1,710/-)
Delivery Within India FREE

Total @Rs.11,210/- each

BlueTooth/WiFi Enabled AVR For OLTC

Softbitonline is pleased to present fully automatic microprocessor based integrated BlueTooth/WiFi Enabled AVR for OLTC of HT power & distribution transformers. You do not require a separate RTCC Panel. This WiFi enabled AVR can be connected to OLTC of an HT transformer directly without any RTCC panel. This WiFi enabled AVRl has auto/manual operation facility and can be fitted either on a wall near transformer or in the LT/HT panel. It has a 16x2 lineLCD display which displays various operations and functions of the AVR. It displays all the electrical parameters (optional feature) on the LCD like - voltage, load current, frequency, power factor, KW, KWH,KVA, KVAH.

BlueTooth/WiFi Enabled AVR For OLTC
Very Low Priced * Very Short Installation Time * Very Compact

Smart OLTC AVR BT/WiFi Enabled AVR For OLTC

Softbitonline is pleased to annouce the launch of its new BlueTooth/WiFi enabled AVR for OLTC. Now you can configure the AVR through an App installed on your android mobile. This is state of the art most advance version of OLTC AVR, compact size with ABS plastic body, can be fitted in HT panel or a separate enclosure. All controls at the front of AVR. Lower volatge, raise volatge, reset, auto/manual opeartion, parallel operation. No need of any extar panel. Very economical.

You have option to buy an internet connectivity module to go online. With this module you can monitor your HT transformer from a remote control room.

Ask for more details: sales@softbitonline.com
Front Panel
Connection Side - Back

Buy Online BlueTooth/WiFi Enabled AVR For OLTC
Item Description Model Payment Option

Blue Tooth Enabled AVR For OLTC
Unit Price: Rs.9,500/-
GST @ 18% (Rs.1,710/-)
Delivery Within India FREE

Total @Rs.11,210/- each

Salient Features BlueTooth/WiFi Enabledd OLTC AVR:

  • Ready to install and use with any make of OLTC/Transformer.
  • Complete OLTC Control and Monitoring System.
  • Separate RTCC Panel not required. This model SE-AVR(96) can be fitted into HT panel with minimal wiring scheme.
  • Built In Voltage Control, Tap Measurement and OLTC status Indications features.
  • 16 x 2pixel line monochrome LCD display the following:
    • Tap Change in progress
    • PT Under /Over Voltage
    • Upper Limit Reached
    • Lower Limit Reached
    • DM Motor Over Load
    • OLTC in Local Mode
    • Mechanism Stuck / DM Motor Reversed
    • Out of step
  • User friendly field programmable through mobile App.
  • Optional GSM/GPRS enabled for remote monitoring and control.
  • Optional Complete remote energy management of transformer
  • Optional SCADA/Web monitoring enabled.
Connection Diagram of OLTC Motor Assemply
Click Image To Enlatge



BlueTooth Enabled AVR For OLTC

Model Type Features Display
SE-AVR(96) BT Enabled
UV, OV, TD, LDC (optional), CFR, AFR, TPI, Parallel. Optional Features: SCADA, SMS Alerts, Sensor Inputs, OL protection 16x2 Line Monochrome

General Specifications Model: SE-AVR(96)

Auxiliary Power Supply:... 110V/250V AC +/- 10%
Frequency: ...................... 50Hz
Power Consumption:........ 15VA
PT Supply:..........................110VAC
Time Delay Adjustment:..... 10 to 100 Secs
Operatiing Temperature: ....Max. 55 deg C
Parallel Operation:..............Model SE-AVR(96): Optional
Size:...................................96mm x 96mm x120mm (SE)
Weight:..............................1 Kg approx.


Buy Online BT Enabled AVR For OLTC
Item Description Model Payment Option
BlueTooth Enabled AVR For OLTC
Unit Price: Rs.13,500/-
GST @ 18% (Rs.2,430/-)
Delivery Within India @ Rs.531/-

Total @Rs.16,461/- each

Over Voltage/Under Voltage Protection:
The AVR has built in feature for protection against UV/OV from PT. An aux. relay is energized to operate an hooter. The UV and OV state is shown on the LCD. You can also set the AVR to get an SMS on your mobile phone in case of OV/UV.

Time Delay:
The affect in change in voltage takes place only after the time delay (TD) has elapsed as set by the user. In other words the relay will send command to the motor only after the time delay has elapsed. This is required to avoid the motor start/stop on frequent voltage fluctuations. This delay time can be set from 5 to 125 seconds.

Line Drop Compensator (LDC):
This refers to the drop in line voltage from generating end to transformer primary. The LDC helps the AVR to compensate this drop. The feature is added on request on charge-able basis.

Control Failure Relay (CFR):
If the OLTC/AVR malfuctions because of any reason for certain preset time (say 10 minutes) then the CF relay will get energised and activated. An alarm can be connected with this relay contacts. Once the controls resume the normal functions, the relay gets de-energized putting the alarm off. All this can be seen on the LCD. You can also set the AVR to get an SMS on your mobile phone in case of control failure of the OLTC AVR.

Auxiliary Fail Relay (AFR):
In case auxiliary supply to AVR fails (from PT), the AF relay gets activated. You can also set the AVR to get an SMS on your mobile phone in case of auxiliary supply faiure.

Tap Position Indicator (TPI):
This feature is used to indicate the tap position. The tap position is displayed on the LCD. You can get tap postion on your mobile phone also (on request).

OLTC AVR Parallel Operation:

The OLTC AVR module has (optional) the provision to operate more than one transformers in parallel. One transformer is taken as the master and the remaining as the followers so that they follow the master's LV voltage set values.

AVR Model: SAG-E44, SCADA Enabled

Fig.:AVR model SAG-E44

Fig.: Inside View of SAG-E44
Wall Mount Type; Dimensions: 285mm (W) x 385mm (H) x 175mm (D)

OLTC AVR model SAG-E44 can be monitored and control through a wireless SCADA application from any where in the world. You can monitor the complete parameters of a transformer like electrical parameters, winding temperature (sensor required), oil temperature (sensor required), oil level (sensor required), buclotz relay status. oil leakage (sensor required).

Printer For Instant Reports (Optional Feature):
OLTC AVR model SAG-E44 can be provided with a 80 column printer to get instant printouts on the spot. You can select the parameters for which you need the instant printouts.

SMS Alerts:
All the functions and events happening in the OLTS AVR can be received on your mobile phone.

Global Positioning System (GPS):

You can see the location of your transformer on google map from any where in the world.

Analog & Digital Sensors:
You can connect 4 X analog sensors (4 - 20 mA OR 0 - 5 volts) to record and monitor the health of the HT transformer. You can conncet 4 x digital sensor (pulse/counter) to check the status of transformer buchlotz's relay, transformers breaker etc.,.

Over Load Protection (OLP):
In case a transformer if getting overloaded, you can get an instant alert on 5 mobile numbers so as to take immediate action. Optional feature can also be provided to start an alarm or switch off the breaker and hence the transformer to save it from over-heating,

Ask For A Quote At - sales@softbitonline.com
Our Recent Projects
1. Design, Manufacture & Supply of RTCC Panel With OLTC AVR & Live Substation Monitoring (4G Wireless Communication) For 10MVA/132kV/33kV NGEF Transformers with Web Based SCADA x 4nos
2. Design, Manufacture & Supply of RTCC Panel with OLTC AVR & Live Monitoring of 5MVA/33/11 kV ELECTRA make Transformers x 6 nos
3. Design, Manufacture & Supply of RTCC Panel with OLTC AVR & Live Monitoring of 3MVA/33/11 kV Transformer x 6 nos
Order belongs to Rajasthan Govt. (through their contractor. Work includes installation & commissioning also)

You Would Like To Know:
Function of OLTC AVR:

Onload Tap Changer (OLTC) is used with higher capacity transformers where HT side voltage variation is frequent and a nearly constant LT is required. OLTC (On Load Tap Changer) is fitted with the transformer itself. Multiple tappings from HV windings are brought to the OLTC chamber and conacted to fixed contacts. Moving contacts rotates with the help of rotating mechanism having a spindle. This spindle can be rotated manually as well as electrically with a motor. Motor is connected in such a way that it can rotate in both the directions so as to rotate the OLTC contacts in clockwise and anticlock-wise direction. Two push buttons are fitted on the LCP (local control panel) to rotate the motor and hence the OLTC contacts in clockwise and anti-clockwise direction. This movement of contacts thus controls the output LV voltage of the transformer. So rotating of OLTC contacts with spindle or push buttons in this way is a mannual process.

In case the process of rotating the OLTC contacts and hence controlling the LV side voltage is to be done automatically then an AVR (Automatic Voltage Regulator) is installed with the transformer OLTC.

  Download Catalogue

Working of OLTC AVR:

The Automatic Voltage Regulator Relay or AVR Relay is a totally microprocessor based relay that controls the arm movement with the help of high torque motor (OLTC and motor are not parts of the AVR supply). It also indicates the line voltage, line current, load on the transformer, apparent and reactive powers, system frequency and power factor. The AVR can be set to "Auto" or "Manual" mode. In "Auto" mode the AVR controls and maintains the transformer LV voltage as per the pre set value automatically. It sences the variations in LV voltage for a pre-set time delay and brings the voltage to normal value by changing the tap position of OLTC with the help of high torque motor. In "Manual" mode the LV voltage can be controlled through low/high push buttons which are fitted along with OLTC - LCP (Local Control Panel). Up and down movement of OLTC motor is indicated with the glow of LEDs fitted on the AVR and on the OLTC - LCP. This AVR can be used with any type of OLTC as it has to control the movement of motor which is connected with the arm that moves the contacts of the OLTC. The LCP is generally fitted near the OLTC or upon the OLTC box while the RTCC is fitted with the HT panel of the transformer.                                

SCADA For HT Transformer Monitoring & Control With Built-in AVR

Ask For A Quote At - sales@softbitonline.com

Other Products

WiFi AVR Configuration APP

Remote Monitoring

softbitonline remote data monitoring and graphical representation by GSM GPRS technology
Graphical Data View

Live Wireless Data Transmission - GSM/GPRS technology
Tabular Data View

Real Time Wireless Data Transmission - GSM/GPRS technology
Central Monitoring

GSM/GPRS Data Loggers
Data Loggers for various industrial applications



Softbitonline Quick Reference:
Management of the vehicular parking is necessary in all the cities around the world. Proper parking management is a major problem. Earlier, only manual sliding or swing doors were used that were cheap and required low maintenance. However, in modern parking systems utilization of automatic gates is done. The logical controllers and web SCADA applications can be used for automatic parking, operation and control of the parking area and gates. Automatic ticket dispensers can also be set up at the entry gates of the premises and in residential complexes, buildings or bungalows. Softbitonline offers logical controllers, GSM/GPRS/RF based RTUs and web SCADA applications for wireless monitoring and operation of the automatic car parking systems. We design and manufacture GSM/GPRS/RF based RTUs and logical controllers for making car parking systems automatic. Since these logical controllers and RTUs are wireless and GSM/GPRS based, the operator can monitor and control them from the central control room using a computer. The user can also monitor the area using their mobile phones that would receive data from the GSM/GPRS/RF based RTUs attached to the field device. We also provide customised web SCADA software applications that are compatible with the logical controller or the hardware. Our web SCADA software for car parking, gates and security is completely web based and requires no installation. You can access it using a web browser. Therefore, monitoring and control can be done from any location. This GPRS/GSM based logical controller and web-based SCADA system cut the maintenance costs and increases the device’s uptime. Real-time data can be fetched using our internet based SCADA system. SMS alerts can be also set for 5 user selected registered mobile number. Our SCADA system is fully secured and can only be accessed by the registered user. The user has to login using his/her account name and password to access the data. Our wireless data loggers/RTUs have been installed in effluent treatment plants, pole mount sub stations, for remote energy management, water quality monitoring, pump house automation, energy saving systems, water flow monitoring, wireless energy monitoring, solar power and wind energy monitoring.  Wednesday, 1 May 2019 (May 1, Two Thousand Nineteen) Indian Standard Time 13:45 PM, Second Half ..
© All Rights Reserved Softbit Technologies Pvt. Ltd., India. RSS Feeds