AVR

AVR
The Automatic Voltage Regulator Relay - AVR-MA9, 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.

PC/Laptop Connectivity of OLTC-AVR:
The OLTC - AVR can be connected to a desktop - PC or a laptop through RS-485 communication port. The various functions of OLTC - AVR can be set from the PC/laptop and values recorded.

Overcurrent Protection of OLTC-AVR:
The OLTC - AVR is programmed to trigger an electromagnetic relay to activate an alarm in case their is a rapid voltage reduction in the system.

Parallel Mode of OLTC-AVR:
The OLTC - AVR group can operate more than one transformers in parallel mode through master-slave method.
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