About EASUN MVT181 PROTECTION HEALTHY RELAY

EASUN MVT181 PROTECTION HEALTHY RELAY

1. INTRODUCTION The type MVT181 numeric under voltage / over voltage relay combines the power andflexibility of microprocessor technology.Two protection elements, multiplecharacteristics and TRUE RMS measurements are available.Moreover, supervisory components and self “ monitoring features give high confidenceof serviceability.2. APPLICATIONMVT181 is a numerical TRUE RMS single pole over voltage and under voltage relay,which can be used to protect the power system during over voltage and under voltageconditions.Though the relay is generally applicable for any under and over voltage application, thisrelay is best suited for capacitor bank protection as this is having an in-built timerfunction.A time delay function is necessary in a capacitor bank protection to allow the capacitorbank to discharge to a safer level, before reconnecting the same to the system. Otherwisethere will be a danger to the breaker and the capacitor bank, while the capacitor chargedto a negative peak is connected to the system voltage when it is in positive peak.3. DESCRIPTION3.1. Two ElementsMVT181 is a numerical TRUE RMS single pole relay consists of two elements. Eachelement can be selected for under voltage function or over voltage function or switchedoff. The characteristics setting, voltage setting and time multiplier setting areindependently settable for each element and the voltage setting is in terms of voltage.Hence this relay can also be used as a two stage under voltage / two stage over voltageprotection. One stage U/V & 1 stage O/V