EMCO EE301E Automatic Voltage Regulating Relay (AVR) is a precision voltage regulating relay designed for automatic control of transformer tap changers and voltage regulation applications. The EE301E AVR continuously monitors the system voltage and provides appropriate control signals to maintain the transformer output voltage within the desired set range. It is suitable for transformer control panels, RTCC panels and electrical power distribution systems where stable voltage regulation is required.
The EE301E Automatic Voltage Regulating Relay is designed for reliable operation in transformer voltage control applications. It receives the required voltage sensing input, compares the measured voltage with the preset reference value and initiates tap change commands whenever the system voltage deviates from the selected band. This automatic operation helps maintain a stable secondary voltage and reduces the need for continuous manual tap adjustment.
The relay can be used in transformer RTCC (Remote Tap Changer Control) panels for controlling motor-operated tap changers. Depending on the system configuration, the AVR provides raise and lower commands to the OLTC mechanism when the sensed voltage moves outside the preset regulating band. Proper control of transformer tap position helps compensate for voltage fluctuations caused by changing load conditions and supply variations.
 
Key Features of EMCO EE301E AVR:
Automatic transformer voltage regulation
Designed for transformer tap changer control
Suitable for RTCC and OLTC control applications
Continuous voltage monitoring
Adjustable voltage reference and regulating band
Automatic Raise and Lower tap commands
Time delay functionality for controlled tap operation
Helps prevent unnecessary tap changer operations
Suitable for transformer control and voltage stabilization
Compact relay-based control arrangement
Reliable operation for industrial electrical systems
Suitable for replacement and retrofit applications where specifications match
 
The EMCO EE301E AVR relay is commonly associated with transformer control systems where accurate voltage sensing and automatic tap-changing control are required. It can be integrated into an RTCC panel along with the motor drive mechanism, tap position indication, selector switches, contactors and other transformer control components.
 
Applications
The EE301E Automatic Voltage Regulating Relay is suitable for applications including power transformers, distribution transformers, transformer substations, industrial electrical installations, RTCC panels, OLTC transformer systems and automatic transformer voltage control systems. It can be used wherever automatic monitoring and regulation of transformer voltage is required.