SUBMITTED BY:AKANKSHAECE/08/101

PERFORMANCE TESTING OF HRC FUSE LINKS

CONTENTS• MINIATURE CIRCUIT BREAKER(MCB)• MOULDED CASE CIRCUIT BREAKER(MCCB)• RESIDUAL CURRENT CIRCUIT BREAKER(RCCB)• MOTOR PROTECTION CIRCUIT BREAKER(MPCB)• OFF LAOD/ON LOAD CHANGE OVER SWITCHES• PLUG AND SOCKET• COMPACT FLUORESCENT LAMPS(CFL)• DOMESTIC LUMINARIES• HIGH REPTURING CAPACITY(HRC FUSES)• PERFORMANCE TESTS ON HRC FUSE LINKS

MINIATURE CIRCUIT BREAKER

• Why used?• The indication of faulty

circuit become very fast

• provides shrouds to prevent direct touch with live parts ensuring protection against electrical shocks.

• Operating

mechanism:• Quick make • Quick break trip free

mechanism

MCB CONTI…

RCCB (RESIDUAL CURRENT CIRCUIT BREAKER)

• The RCCB works on the principle of current balance that is in an electrical circuit .

• The incoming current is equal to the outgoing current.

• The CORE BALANCE TRANSFORMER having primary and secondary winding and a sensitive relay for instantaneous detection of fault signal.

• The primary winding lies in series with supply mains and load.

• The secondary winding are connected to sensitive relay.

RCCB CONTI….

MCCBS (MOULDED CIRCUIT BREAKER)

1. Actuator 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

MCCB CONTI….

• SALIENT FEATURES• Quick make ,quick break

and trip free mechanism• Clear indications of

ON,OFF AND TRIP position

• Push to trip facility for verification of proper working of operating mechanism

• Wide range of internal and external accessories

• Housing made of heat resistant thermo set insulating material

MINIATURE CHANGE OVER SWITCH

• capable of operating under overload conditions and also carry current under specified abnormal circuit conditions such as those of short circuit for specified time .

• FEATURES• Compact in size.• Double break contacts• Special silver alloy contact tips• Shrouded terminals for safety • Three stable position ON-OFF-ON• Housing is made of non hygroscopic fire retardant

thermoplastic• DIN rail mountings• Can be mounted with MCB, ELCB , Isolator in distribution

boards

MCOS CONTI….

DOMESTIC LUMINARIES

• TYPES OF DOMESTIC LUMINARIES:

• General purpose slim strip type fixature.

• Decorative Indoor use luminaries suitable for fluorescent tubular

lamp.

CONSUMER LUMINARIES• INDO BAR: General purpose slim strip type fixature suitable for

fluorescent tubular lam 40/20 W for indoor use.• SOLAR : Decorative indoor use luminaries suitable for fluorescent

tubular lamp 20/40 W The luminaries has coloured plastic caps on the end.

• LUNAR : Decorative indoor use luminaries suitable for fluorescent tubular lamp 20/40 W The luminaries has coloured plastic caps on the end.

• PULSAR : Sleek indoor luminaries with high frequency electronic ballast is for 15 fluorescent energy saving tube 14/28 W and without prismatic diffuser.

• PULSAR PLUG: Sleek indoor luminaries with high frequency electronic ballast is for 15 fluorescent energy saving tube 14/28 W .Prismatic diffuser in pulsar plus ensures glare free light.

• CRYSTAL: Sleek indoor luminaries with high frequency electronic ballast is for 15 fluorescent energy saving tube 18 W/36 W .

• SPECTRA: Decorative Indoor use luminaries 11 W/36 W high lumen pack CFL for brighter ambience using anti glare diffuser.

• VENUS: Decorative Indoor use luminaries with acrylic diffuser suitable for 11 W/36 W compact fluorescent lamp for suitable light.

• PLUTO: Decorative indoor use high lumen pack CFL for brighter ambience using FPL 36 W.

CFL LUMINARIES (OMPACTS FLUOROSCENT LAMP)

• FEATURES:

• Reduced energy cost by 80%

• Long life up to 8000 hrs.

• Ease of operation –reduces frequency of replacement and hence low cost of maintenance

• High luminous efficiency

• Available in different colour appearances to create desired ambience.

CFL Luminaries

PLUGS AND SOCKETS

• FEATURES:

• Easy to install

• Accessible wiring space at +18 degrees

• Design provides strength

• Opening and closing of piece through clipped on device and cables connection by screws.

• Made of halogen free plastic material.

• All screws and lid spring

protected against corrosion

FUSES AND ITS CLASSIFICATION

• A device that by the fusing of one or more of its specially designed and proportioned components opens the circuit in which it is inserted by breaking the current when this exceed a given value for sufficient time.

• The common materials used for fuse element are copper, tin lead alloy (tin 63% and lead 37%), silver, aluminium etc.

• TYPES OF FUSES: • There are two common types of fuses:• LOW VOLTAGE FUSES• HIGH VOLTAGE FUSES

• LOW VOLTAGE FUSE: SEMI CLOSED REWIRABLE FUSES : • Consists of two separate parts made from porcelain called

base and fuse carrier.• These fuses are made up to 500 Amp current but there

breaking capacity is low.

HIGH RUPTURING CAPACITY FUSES :• HRC cartridge fuses are specially designed for extremely rapid

operations.• They are quite reliable and can be selected for proper

discrimination.

HIGH VOLTAGE FUSES:

The following two types of high voltage fuses are:

CARTRIDGE TYPE: • It is almost similar to low voltage HRC cartrisge fuse in construction. • The only difference is that the fuse element is wound in the shape

of helix so as to avoid the corona effect

LIQUID TYPE: • It essentially consists of a glass tube filled with carbon tetra

chloride solution and sealed at both ends with brass caps.

• The corona is eliminated by carbon tetra chloride filled in the tube.

HRC CONTI….

HRC FUSES AND FUSE BASES• SALIENT FEATURE:• High breaking capacity 80kA and 120 kA at 500V• Available with ISI and CE marking.• Low watt loss, ensures cool running and longer life.• No duration required for connected equipment.• Low cut off characteristic , reduced electro magnetic stress.• Fault indication is immediate. The red pop up chin comes out

instantly on fusing

• TYPES OF HRCs: • The following types of HRC s are manufactured in INDO

AISAN,MURTHAL PLANT.:• DIN TYPE HRC • BOLTED TYPE HRC• CYLINDRICAL TYPE HRC• J TYPE HRC

Various HRCs

Testing On HRC:• These are the main tests carried out for HRC fuse

links.

1. DIMENSION CHECKING2. RESISTENCE CHECKING3. TEMPERATURE RISING AND POWER DISSIPATION4. CONVENTIONAL NON FUSING TESTS5. RATED CURRENTS6. TIME CURRENT CHARACTERISTICS7. FREEDOM FROM SEASON CRACKING

PERFORMANCE TESTING OF ZR-1,63 Amp CYLINDRICAL TYPE HRC

FUSE LINK:REASON: PerformanceDETAIL: sample recieved from QADELEMENT DESIGN : 3*3.5*0.175*55=> SHORTCUT ZONE

REFERENCE SPECIFICATION: IS -1361FUSING CURRENT TEST:• CONTACT RESISTANCE=919VOHM@ 29 C• FUSING FACTOR: 1.5 IN• FUSING CURRENT=15*63=94.5 Amp• SETTED AT= 11:00 AM• FUSE BLOWN AT=12:15PM• TOTAL FUSING TIME=2700 SEC• MAX PERMISSIBLE FUSING TIME=4hrs• RESULT=OK

TEMPERATURE RISE TEST:• CONTRACT RESISTANCE= 314VOHM @ 37 C

SR NO TIME AMBIENT TEMPERATURE

TEMP OF UPPER TERMINAL(11)

TEMP OF LOWER TERMINAL(12)

MV DROP

1 01.30 PM

24.5 C 99.0 C 93.0 C 81.6 mv

2 02.30 PM

24.9 C 88.0 C 90.0 C 80.2 mv

3 03.30 PM

24.8 C 85.0 C 87.0 C 79.4 mv

4 04.30 PM

23.0 C 81.0 C 83.0 C 78.5 mv

5 05.30 PM

22.0 C 81.0 C 83.0 C 77.2 mv

24.9 C 90.0 C 93.0 C 81.6 mv

• MAX TEMP RISE AT TERMINALS =93-24.9=68.1 C C• MAX WATT LOSS=81.6*63/1000 =5.140 WATT• MAX PERMISSIBLE WATT LOSS FOR THIS SAMPLE =12 WATT• RESULT=OK• 3) NON FUSING CURRENT TEST:• CONTACT RESISTANCE= 358VOHM @ 29 C• NON FUSING FACTOR= 1.25 In• NON FUSING CURRENT= 1.25*63=78.75Amp• RESULT: Does not blow for 4 hours ie ok

•FINAL RESULT=SATISFACTORY

THANK YOU