havells ppt
-
Upload
raj-sharma -
Category
Engineering
-
view
336 -
download
18
description
Transcript of havells ppt
HAVELLS INDIA LIMITED. GHAZIABAD Submitted by – Raj Kishore Sharma Roll no.-10/EE/2739 Electrical-4 yr.
CONTENT MCCB AIR CIRCUIT BREAKER CONTROL GEAR CAPACITOR LOAD BANK
MCCB (Moulded Case Circuit Breaker) A molded case circuit breaker is a plastic that
interrupts an electrical current if the current exceeds the trip rating of a breaker.
Rated current up to 1000 A MCCBs provide overload and short-circuit
protection for all applications. The thermal & magnetic elements, adjustable over a wide band, make these MCCBs ideal for any distribution application.
Servo controller setting formula
(MCCB Rating X 1.05/C.T) for holding current
(MCCB Rating X 1.3/C.T) for Tripping current
Types of MCCBCurrent Rating Breaking Capacity
G-frame 16A - 160A
10KA, 16KA, 25KA
A frame 25A -125A, 160A-200A, 160A-250A
10KA, 25KA, 31KA
F frame 25A - 250A 35KA, 50KA
C frame 160A-800A 35KA, 50KA
L frame 400A, 250A, 320A, 315A, 630A, 500A
36KA,50KA
D frame 800A, 1200A, 1000A, 1600A 50KA
TESTING THERMAL TESTING –
Thermal testing is done for check breaker is TRIP or Not when overload current is flow. Those current which are obtained during overload time period.
given overload current is 3In or 2In.
MAGNETIC TESTING-
Magnetic testing is done for check breaker is TRIP or Not when short-circuit current is flow.
for Holding Current- 80% of breaker rating X10
for tripping current–120% of breaker rating X10
TRIP/NOT TRIP TEST-
during this test breaker hold in ON position for 2Hr at 105% current of breaker rating and after holding 2Hr current is given 130% of breaker rating for next 2Hr for checking breaker is Trip or NOT.
MECHANICAL ENDURANCE TEST-
During this test we check working operation of mechanism which are used to CONNECT or DISCONNECT the moving contact to fixed contact. These TESTING is done by using AIR PRESSURE for moving the mechanism.
During these test operation is done 1 million.
FeaturesWide range: 16A to 1600A (AC)
Compact dimensions
Adjustable thermal setting (70-100%) In.
Adjustable magnetic setting (5-10 times / 4-10 times) In.
Suitable for use as switch disconnector
In 4PwSN version, neutral makes first and breaks last
Push to trip button provision
Uniform front escutcheon plate
Positive dolly position indication
Suitable for DC application up to 1600A
Separate main and arcing contacts
Wide range of accessories
AIR CIRCUIT BREAKER (Rating 630A to 4000A) A circuit breaker is an automatically operated electrical switch designed to protect an electrical
circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
Once a fault is detected, contacts within the circuit breaker must open to interrupt the circuit; some mechanically-stored energy (using something such as springs or compressed air) contained within the breaker is used to separate the contacts, although some of the energy required may be obtained from the fault current itself. Small circuit breakers may be manually operated and electric motors to restore energy to the springs
1.Acuator lever - used to manually trip and reset the circuit breaker.
Also indicates the status of the circuit breaker (On or Off/tripped).
2.Actuator mechanism - Forces the contacts together or apart.
3.Contacts - Allow current when touching and break the current when moved apart.
4.Terminals 5.Bimetallic strip.
6.Calibration screw - Allows the manufacturer to precisely adjust the trip current
of the device after assembly.
7.Solenoid
8.Arc divider/extinguisher
CONTROL GEAR
CONTACTOR RELAY
CONTACTOR A contactor is an electrically controlled switch used for switching a power circuit.
contactor range from 9A – 630A in 3P & 4P execution. The contactors provide reliable and safe switching and the thermal relays offers close & accurate protection against overload.
TYPES OF CONTACTOR CN Series: AC contactor with AC coil
CD Series: AC contactor with DC coil
CH Series: AC contactor with AC / DC coil
FEATURE Latest: Fully application oriented conforming to IS/IEC 60947-4-1
Wide Range: CR, 9A – 95A (4kW – 45kW) in 6 frame sizes
System Design: For a compact system building built in aux. contact 1NO / 1NC up to 32A and 1NO + 1NC from 40A to 95A
Execution: 3P / 4P
Control: AC / DC
Utilization Category: 12 AC Duty Categories,4 DC Duty Categories
Flexible: Common add-on, side & front mounted aux. contact & accessories
Options: Diagonal or same side wiring on coils up to 95A
Indian Conditions: Liberal creepage distance & superior material grade
Safety: Shrouded terminals to prevent accidental contact with live parts
Facility: DIN Rail Mounting up to 95A & direct mounting with O/L relays up to 95A
Modular Design: All accessories snap fitted
Conservation: Low coil consumption
TESTING The tests performed are:Flashing & Continuity Test.
Coil current & Wattage measurement Test.
Pick-up / Drop-off Test.
High Voltage Test.
THERMAL OVERLOAD RELAY RELAY is sensing device which is used to sense the abnormal condition and break the circuit.
A thermal overload relay is a device to protect an electrical device like a motor/generator from catching fire/burning out due to excessive heat produced during operation. The relay has a bi-metallic contact that operates with temperature. When the temperature of the system goes above a pre-set value, contact goes from closed position to open, and the power supply to the circuit is cut and the device is saved from damages. So it keeps the system with in the Safe operating temperatures.
TYPE • Auto / manual reset
• Manual reset
RANGE: Contactor Mounting - 0.1A - 93A in 24 direct reading version (Auto / manual).
Contactor Mounting - 0.1A - 80A in 20 direct reading version (Manual).
Individual Mounting - 0.1A - 93A in 24 direct reading version (Auto / manual & Manual).
Electronic Individual Mounting - 30A - 630A in 8 direct reading version (Manual).
FEATURE Protection against overload & single phasing
Auto manual / manual reset facility
Ambient temperature compensated
Potential free trip contacts
Test mode facility
Contactor mounting / Individual mounting with
adaptor
Matching to contactor rating upto 95A
CAPACITOR
A capacitor is a electrical component used to store energy in an electric field.
An ideal capacitor is characterized by a single constant value, capacitance, measured in FARADS, practically in MICRO-FARADS (MFD). This is the ratio of electrical charge on conductor to the potential difference between them.
C=Q/V
TYPE OF CAPACITOR1. MFD- Micro-farads- These are made by the MFD rating for the general purpose.
2. KVAR- These are the power capacitor, which are made for the special purpose of improving the power factor. These are also called PFC capacitor.
GENERAL USAGE OF CAPACITORS To block the flow of DC in electronic circuit.
Used in FANS.
Usage as an energy storage device.
For improving the power factor.
LOAD BANK
LOAD BANK APFC PANEL BUSBAR CHAMBER MCCB ENCLOSER
LOAD BANKload bank is a device that is used in developing an electrical
load which it applies on an electrical power source and converts
the resultant power output. It is used to copy the operational
load which would be used by an actual application that received
its electrical load direct from the power source. Other than serve
the power source, the load bank protects it using its energy
output.
APFC PANEL The APFC panel is Automatic Power Factor Correction Panel is used to control
the power factor in a real system, where continuous fluctuation in voltage or current are there. It contain the bank of capacitor connected in parallel.
BUSBAR CHAMBER
The busbar chamber are used to distribute electrical power. The main supply is fed through the incoming module to a busbar, made of copper wire. And electrical output is taken from the ends of busbar. These are available for 100A to 800A in 4 way, 6 way and 8 way.
MCCB ENCLOSUREEnclosure are made of special grade CRCA steel are available for housing A,G,C and L
FRAME MCCB.
THANK YOU