شرح موزع الجهد المتوسط ح#11 وحده الربط الحلقي RMU (الجزء الثاني)

شرح وحده الربط الحلقي Ring Main Unit اجهزه الحمايه وطريقه التشغيل. The RM6 Connected Advanced cubicle is a complete integrated solution that consists of: • A proven and robust RM6 RMU with voltage and current sensors • An RTU (T300) located in a LV cabinet placed on top of the RM6 • Sensors for condition monitoring • A fully tested solution • Plug and play installation Protection relays VIP 40, 45, 400, 410 selection guide Main features Self-powered operation • Energized by the CTs: no auxiliary power needed Complete pre-tested protection system • Functional block ready to be integrated Phase overcurrent protection • Tripping curve optimized for MV/LV transformer protection • Protection against overloads and secondary and primary short-circuits • Second harmonic restraint filtering • Only one setting (I) • Discrimination with LV circuit breakers or LV fuses • Compliant with TFL (Time Fuse Link) operating criteria Earth fault protection • Definite-time tripping curve • Settings: Io (phase current sum method) and to • Second harmonic restraint element Measurement • Load current on each phase • Peak demand current m High sensitivity sensors VIP integrated protection system The VIP integrated protection system is composed of sensors, a processing unit and an actuator, designed together to provide the highest level of reliability and sensitivity from 0.2 A to 20 In for VIP 400, VIP 410 and 5 A to 20 In for VIP 40 and VIP 45. Sensors The sensors are made up of one block of three CTs with rated and insulation voltages of 0.72 kV/3 kV - 1min, providing both measurement and power outputs. • The measurement sensor is based on Low Power Current Transformer (LPCT) technology as defined by standard IEC 61869 -2 and IEC 61869-8 (LPCT), ensuring excellent accuracy: 5P30 for protection class 1 for measurement. • The power supply winding ensures calibrated self-powering of the relay even for currents of just a few Amperes Fault current indicators The Easergy Flair (21D - 22D - 23D - 23DM) range of fault passage indicators has been improved to provide indicators in DIN format that are efficient, self-powered and self-adapting to the network to provide hassle-free installation. Flair indicators work with all types of neutral networks and benefit from LCDs that act as an information display. Optional outdoor light indicator. Functions • Indication of phase-phase and phase-earth faults • Display of parameters & settings • Display of the faulty phase • Display of load current, maximum current for each phase, frequency and direction of energy flow • Fault passage indication with voltage detection & Modbus communication (Flair 23DM) Voltage presence indicators A voltage presence indicating device can be integrated in all the functional units, either on the cable or busbar side. It can be used to check whether or not a voltage is present across the cables. Two devices are available: • VPIS: Voltage Presence Indicator System, as defined by standard IEC 62271-206. The VPIS can be fitted with a voltage output (VPIS-VO) dedicated to various voltage detection applications such as automatic transfer switches, voltage absence or presence contacts, live-cable earthing switch lockout, etc. • VDS: Voltage Detecting System, as defined by standard IEC 61243-5 Voltage sensors A voltage sensor is integrated in all the functional units. It provides a signal with an accuracy of 5% to the VPIS through a 30 pF capacitive divider. The sensor is integrated in the tightening cap used to secure the busbar or cable connections. The voltage can be detected either on the cable side or the busbar side. Low Voltage Power Transformers The RM6 can be specified with compact high accuracy Low Power Voltage Transformers (LPVT). These innovative sensors are ideal for the new generation of electronic protection devices and are the only way to measure energy in secondary MV loops. #electrical #mvsg #power #rmu #coursefree #مهندس_عمرو_عفيفي