2. nX Series Relay
โข MC31AnX โ 51, 51N
โข MC61AnX - 51, 51N, 50, 50N
โข MC61CnX - 51, 51N, 50, 50N + Communication
facility
โข nX Series offer you numerical type 3 phase
overcurrent & Earth Fault Relay. Its
microcontroller based design offers you to
choose from various field selectable IDMT &
definite curves.
3. nX Series Relay Features
โข 3 Over current + 1 Earth Fault Element
โข . Dual Rating Suitable for CT Sec 1A/5A
โข . Universal Auxiliary Supply: 24 โ 240 V AC/DC
โข . Wide TMS Range : 0.01 โ 1.60
โข . Draw-out execution with automatic CT shorting facility
โข Instantaneous over current and earth fault element
โข Communication through Modbus Protocol on RS485
โข . Breaker Controland failure protection
โข . Auto-Doubling feature: Avoid nuisance tripping on high inrush current
4. L&T MV12 UV/OV Relay
It is a Single Phase Under Voltage or Over Voltage
Relay
โข Salient Features
โข Micro-controller based design
โข Draw Out type construction
โข Inverse & Definite time trip characteristics
โข Field selectable input ranges
โข
5. L&T DIGITAL AMMETER CL0.5
True RMS measurement of voltage and current parameters are
achieved by single function Ammeter (WL1110 / WL1310) and
Voltmeter (WL1120 / WL1320) series. These are available in Class 1 and 0.5.
โข Salient features
โข Accuracy Class 1 as per IEC 62053-21 and Class 0.5 as per IEC 62053-22
โข True RMS measurement
โข Password protection site selectable
โข Auto and manual scrolling.
โข Field programmable CT, PT ratio
โข Site selectable 1A/5A
โข Phase wise and average display of voltage and current as per applicable
meter
โข Inbuilt selector switch for 3 phase models
โข Site selectable for 3 Phase 4 wire, 3 Phase 3 wire, 1 phase
โข Wide operating range of 80 to 300 V AC auxiliary supply in 4110 series
โข Suitable for 50/60 Hz
6. The rating of the ACB is higher than the MCCBs.
Due to this high current rating a ACB is used in
the circuit with a larger circuit current.
The ACB also operates in two different modes. One can be the
magnetic mode and the other is thermal magnetic mode.
Types of air circuit breakers:
Plain air circuit breaker / Cross blast air circuit breaker:
Air chute air break circuit breaker:
ACB
Magnetic blow out type air circuit breaker:
Air blast circuit breaker:
7. The MCCB has improved rating as compared to the ACB.
The tripping thresholds can be adjusted easily in the MCCB. This parameter makes the MCCB
favorable in different circuits over other circuit breakers.
MCCBs are considered more accurate than the ACBs due
to use of different technologies in MCCBs. The
improvements in the technologies have made the circuit
breakers more accurate and prรฉcised.
The MCCB is better than the ACB in different parameters
like breaking capability.
MCCB
8. L&T MULTIFUNCTION METER 4420 Series CL0.5
Salient features
โข Accuracy Class 1 as per IEC 62053-21 and Class 0.5, 0.5S, 0.2, 0.2S as per IEC 62053-22
โข True RMS measurement
โข Expert in Load monitoring
โข Password protection provision for security
โข Phase wise Voltage & Current wave forms in LCD meter
โข Site selectable for 3 Phase 4 wire, 3 Phase 3 wire, 1 Phase
โข Maximum Demand measurement with Real Time Clock in 4440, 5000 & 5010 series
โข Auto scrolling and freeze mode for constant single page viewing available
โข Terminals with sealing provision (optional)
โข Direct access key for Basic parameters, Power and Energy parameters
โข My Favourite screen option for user selectable parameters in LCD series
4420 series: All parameters of
4410 series plus Maximum
Demand (kW & kVA)
9. Vacuum Circuit Breaker
Features:
โข Sub-cubicle for system voltage 11kV and a short time
current rating of 26.3kA
โข Half panel for system voltage 11kV and short time current
rating of 26.3kA and 40kA
โข Half panel comes with an option of Copper/Aluminium bus-
bar
โข VCB current rating upto 3150A
โข Provision of manual and electrical spring charging in VCB
โข Spring charging motor voltage 230V AC and 110V DC/220V
DC
โข Closing/Tripping coil voltage 24V DC/110V DC/220V DC
โข VCB comes with inbuilt anti-pumping feature
The VCB is โdraw outโ type and can
be racked out directly on the floor.
The sub-cubicle is VCB with its
compartment having all safety
interlocks.
10. Current Transformer
โข A current transformer
(CT) is used for
measurement of
alternating electric
currents
Current transformer are used in electrical power system for stepping down
currents of the system for metering and protection purpose.
A CT functions with the same basic working principle of electrical power
transformer
CT steps down rated system current to 1 Amp or 5 Amp.
Because the relays and meters are generally designed for 1 Amp, 5 Amp and
110V
11. BUSBAR
โข Busbar is a strip or bar of copper, brass
or aluminium that conducts electricity
within a switchboard, distribution board,
substation.
โข The cross-sectional size of the busbar
determines the maximum amount of
current.
โข Used to interconnect the loads and
sources of electrical power
12. High-voltage cable
๏ฑA high-voltage cable (HV cable) is a cable used for electric power
transmission at high voltage.
๏ฑFor circuits operating at or above 2,000 volts between conductors, a
conductive shield may surround each insulated conductor. This equalizes
electrical stress on the cable insulation.
๏ฑThose of 10 to 33 kV are usually called medium voltage cables, those over
50 kV high voltage cables.
๏ฑMost high-voltage cables for power transmission that are currently sold on
the market are insulated by a sheath of XLPE. They have metallic screen or
sheath is followed by a polymeric (e.g. PE or PVC) outer jacket.
๏ฑ Most producers of XLPE-compound specify an "extra clean" grade where
the number and size of foreign particles are guaranteed.
13. Classification of cables based on Voltage
rating:
โข Uo/U : Phase to earth voltage
โข Uo : Voltage between conductor and earth
โข U : Voltage between phases (conductors)
โข (i) Low-tension (LT) cables โ upto 1000 V
โข (ii) High-tension (HT) cables โ upto 11,000 V
โข (iii) Super-tension (ST) cables โ from 22 kV to 33 kV
โข (iv) Extra high-tension (EHT) cables โ from 33 kV to 66 kV
โข (v) Extra super voltage cables โ beyond 132 kV
โข A low-voltage system usually has a solidly earthed neutral
โข High-voltage cables used in Shell installations
14. TECHNICAL SPECIFICATION FOR 33KV H.T.XLPE POWER
CABLE
โข Maximum ambient temperature (deg C) 50
โข Maximum temperature in shade (deg C) 45
โข Minimum temperature in air (deg C) in shade 3.5
โข Relative Humidity (%) 10 to 100
โข Maximum annual Rainfall (mm) 1450
โข Maximum Wind Pressure (kg/mm2) 150
โข Maximum altitude above mean sea level (Meters)
1000
โข Isoceraunic level (days/year) 50
โข Seismic level (Horizontal acceleration) 0.3 g.