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Voltage Monitoring Relay. Under/over voltage, phase imbalance, phase loss and reversal protection

Video Chapter: 00:00 What is VMR 00:25 How does VMR works? 00:55 Application sample 01:25 VMR Specification 02:58 VMR Settings 04:03 Undervoltage function 04:45 Overvoltage Function 05:06 Phase Imbalance 05:32 Phase Loss 06:04 phase reversal. 06:32 VMR Function and operation What is a Voltage monitoring Relay or VMR? A Voltage Monitoring Relay is a protection device, whose function is to monitor power supply voltage, and provide a safe shutdown of equipment in the event of voltage abnormalities. How does Voltage monitoring relay works? Three-phase VMR have a built in Micro Control Unit or MCU which monitor power supply qualities like under voltage, over voltage, phase imbalances or asymmetry, phase sequence, and phase loss. Once any of these is detected above or below the trip value setting in the VMR, the relay will send an output signal to isolate an electrical equipment from the power supply. Application It can be used as a protection device in the distribution Panel. If integrated to a main breaker control, it can isolate a number of feeders to protect different loads from voltage abnormalities present in the main power line. It can also be used as an additional protection device for motors. VMR output contact can be wired in series with the thermal overload device, Where a voltage quality is required to operate them properly and safely. VMR Specification. To understand more of the VMR, let's get familiar with basic VMR specifications. 1. Supply voltage : This is the rated voltage of VRM that match with system voltage thats need to be monitored. 2. Frequency: 50 or 60 Hertz, depending on the standard frequency your country is using. 3. Protection features: Depending on your system requirement there are 5 basic protection functions that you can include in your specification list 3.1. over voltage 3.2. under voltage 3.3. Phase asymmetry or phase Imbalance 3.4. Phase loss 3.5. phase sequence or phase reversal. 4. Time delay: Your VMR will have two time delay functions. First, on delay, when the relay receives normal power, the output signal changes status, after the on delay timer elapse. Trip time delay, once the relay detected a voltage abnormalities, the trip timer starts to count, and output contacts change status after the trip time elapses. 5. Output contact: Specify the Number of Normally open and Normally close contacts. rated ampere, contacts are specified to indicate the current load limit. 6. LED Indication :for active fault signals. This makes troubleshooting easy, as the voltage abnormality is visually available in the relay. Disclaimer: Content of this presentation is intended for general information and educational purposes only. While the information in the video has been verified to the best of my knowledge, abilities and intention to inform. I can not guarantee that there are no mistakes or error.