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