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

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