Answer / shaik sharif

This three circuit breakers are widely used in the power distribution system for switching & protection of the distribuiton sytems.

ACB : Airblast Circuit Breaker

By using the air in tube which is using for arc quenching in side the tube.

VCB : A vaccum using for arc quenching
SF6: Sodium Hexa Flouride Gas using for arc quenching during the operation of switch .

Answer / sanjayjssate

Above answer is correct , but acb is used for voltage less than 1100 v, vcb is used for voltage less than 33kv and sf6 breaker is used for voltage above 33 kv.

when the PFR (POWER FACTOR REGULATOR)change a step to zero,one of the RCCB will triped off,is it the changing step of this PFR effect the RCCB?

2 Answers  

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HOW TO CALCULATE THE LOSSES OF CURRENT FOR LT CABLE JOINTING TO MOTOR SUPPLY.

2 Answers  

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how many types of ct retio

3 Answers  

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2 hp motar how many amps taken please show me the formula

4 Answers   Cable Wireless,

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what is the Transformer Protection & Type ??

4 Answers   GE,

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Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1.  H1-H2 = H2-H3 H3-H1 2.  H2-H3 = H3-H1 H1-H2 3.  H3-H1 = H1-H2 H2-H3 For the LV side also: 4.  X1-X0 = X2-X0 X3-X0 5.  X2-X0 = X3-X0 X1-X0 6.  X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0  H2-H0  H3-H0    X0-X1  X0-X2  X0-X3 128.0  119.9  7.2      29.2   13.3   15.8 70.7   128.4  59.2     23.4   22.0   3.6 7.2    120.1  128.1    13.4   29.3   15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?

0 Answers  

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For Synchronisation of DG Sets Sometimes we people use NIC (Neutral Isolation Contactor) Instead of 4-pole ACB or any switchgerar..Please guide me why is it so????

4 Answers   Piramal Glass Limited,

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why we use shunt in a rectifier system ?

1 Answers  

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Which system use dc to dc high voltage gain A. Solar system B. Battery backup

1 Answers  

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what is work of CTPT in 33/11kv Substation

1 Answers   Fiat,

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can indirect loading be called as phantom loading?

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What is the use of oil in transformers?

0 Answers  

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