This presentation contains the various Components and Electromechanical devices used in Switchgear for designing HV panels for Industries.

1. HV PANEL SWITCHGEAR

2. nX Series Relay
• MC31AnX – 51, 51N
• MC61AnX - 51, 51N, 50, 50N
• MC61CnX - 51, 51N, 50, 50N + Communication
facility
• 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
• 3 Over current + 1 Earth Fault Element
• . Dual Rating Suitable for CT Sec 1A/5A
• . Universal Auxiliary Supply: 24 – 240 V AC/DC
• . Wide TMS Range : 0.01 – 1.60
• . Draw-out execution with automatic CT shorting facility
• Instantaneous over current and earth fault element
• Communication through Modbus Protocol on RS485
• . Breaker Controland failure protection
• . 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
• Salient Features
• Micro-controller based design
• Draw Out type construction
• Inverse & Definite time trip characteristics
• Field selectable input ranges
•

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.
• Salient features
• Accuracy Class 1 as per IEC 62053-21 and Class 0.5 as per IEC 62053-22
• True RMS measurement
• Password protection site selectable
• Auto and manual scrolling.
• Field programmable CT, PT ratio
• Site selectable 1A/5A
• Phase wise and average display of voltage and current as per applicable
meter
• Inbuilt selector switch for 3 phase models
• Site selectable for 3 Phase 4 wire, 3 Phase 3 wire, 1 phase
• Wide operating range of 80 to 300 V AC auxiliary supply in 4110 series
• 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 précised.
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
• Accuracy Class 1 as per IEC 62053-21 and Class 0.5, 0.5S, 0.2, 0.2S as per IEC 62053-22
• True RMS measurement
• Expert in Load monitoring
• Password protection provision for security
• Phase wise Voltage & Current wave forms in LCD meter
• Site selectable for 3 Phase 4 wire, 3 Phase 3 wire, 1 Phase
• Maximum Demand measurement with Real Time Clock in 4440, 5000 & 5010 series
• Auto scrolling and freeze mode for constant single page viewing available
• Terminals with sealing provision (optional)
• Direct access key for Basic parameters, Power and Energy parameters
• 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:
• Sub-cubicle for system voltage 11kV and a short time
current rating of 26.3kA
• Half panel for system voltage 11kV and short time current
rating of 26.3kA and 40kA
• Half panel comes with an option of Copper/Aluminium bus-
bar
• VCB current rating upto 3150A
• Provision of manual and electrical spring charging in VCB
• Spring charging motor voltage 230V AC and 110V DC/220V
DC
• Closing/Tripping coil voltage 24V DC/110V DC/220V DC
• VCB comes with inbuilt anti-pumping feature
The VCB is ‘draw out’ 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
• 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
• Busbar is a strip or bar of copper, brass
or aluminium that conducts electricity
within a switchboard, distribution board,
substation.
• The cross-sectional size of the busbar
determines the maximum amount of
current.
• Used to interconnect the loads and
sources of electrical power

12. High-voltage cable
A high-voltage cable (HV cable) is a cable used for electric power
transmission at high voltage.
For 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.
Those of 10 to 33 kV are usually called medium voltage cables, those over
50 kV high voltage cables.
Most 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.
 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:
• Uo/U : Phase to earth voltage
• Uo : Voltage between conductor and earth
• U : Voltage between phases (conductors)
• (i) Low-tension (LT) cables — upto 1000 V
• (ii) High-tension (HT) cables — upto 11,000 V
• (iii) Super-tension (ST) cables — from 22 kV to 33 kV
• (iv) Extra high-tension (EHT) cables — from 33 kV to 66 kV
• (v) Extra super voltage cables — beyond 132 kV
• A low-voltage system usually has a solidly earthed neutral
• High-voltage cables used in Shell installations

14. TECHNICAL SPECIFICATION FOR 33KV H.T.XLPE POWER
CABLE
• Maximum ambient temperature (deg C) 50
• Maximum temperature in shade (deg C) 45
• Minimum temperature in air (deg C) in shade 3.5
• Relative Humidity (%) 10 to 100
• Maximum annual Rainfall (mm) 1450
• Maximum Wind Pressure (kg/mm2) 150
• Maximum altitude above mean sea level (Meters)
1000
• Isoceraunic level (days/year) 50
• Seismic level (Horizontal acceleration) 0.3 g.