Answer / asif mansoori

As for SFU is concerned, TPN will mean triple pole with
Neutral. For MCB, MCCBs, TPN will mean a 4Pole device with
4th Pole as Neutral. In TPN, opening & closing of the
device will open & close the Neutral. While in SFU,
Neutral doesn't automatically opens or closes as it does in
case of MCBs or MCCBs. In MCBs & MCCBs, protection is only
on Three poles & Neutral is just a isolating pole. For
application where TP MCCB or MCB is used in 3ph4wire
system, it is denoted as TP+N which will mean a three pole
device with external neutral link which can be isolated if
required.

Answer / eknath

T.P.N. is a type of s.f.u. triple pole unit with nuetral.

Answer / vikram singh

TPN means tripple pole + neutral....in case of MCB only, TPN
is call 4 Pole also....but in case of SDFU, MCCB, ACB etc
TPN means 3P+N, which means that 3Pole SDFU, MCCB ACB etc is
taken and nuetral busbar runs as 4th pole with it

Answer / nick j

TP&N in Switchgear when reffering to a switch, MCCB,ACB, Disconnector means triple pole device with fixed neutral link
which Isolatable by removing the link in the neutral
4 pole means all poles of switch open when operated

Answer / ali

630A TPN ISO and 125A,25KA TPN MCCB

what are the types of 3-ph. generator protection

2 Answers  

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i have seen one 8.4 MW synchronous motor in a plant located in bellary it is fixed with brushless rotary rectifier ,anybody can explain its start up principle

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for 500mw power production how many range of transformer set in unit please reply if three transformer use .

2 Answers  

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two parallel conductors are carrying the current in the same direction.which of the following statements is true? (a)there is arepelling force between the conductors (b)the force increases when the distance between the conductors is increased (c)there is an attaracting force between the conductors (d)the force increases when the distance between the conductors is decreased

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1.what is the funtion of chiller primary & scondary pumps. 2.what is the use of distribution lines & Types. 3.what is the use the thermal power stations & how much capacity.

0 Answers   Wipro,

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how the harmonic pluses take place in the flow of current

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what is the difference between EMF and potential difference??

3 Answers  

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A 50Hz,4-pole,3-phase,star-connected synchronous motor has a synchronous reactance of 12ohmsper phase and negligible armature resistances.the excitation is such as to give an open-circuit voltage of 13.2kilovolt.the motor is connected to 115kilovolt, 50hertz supplying. what maximum load can be the motor torque,line current and power factor?

0 Answers  

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When we have earthing mesh or underground earthing network in industrial plants, weather we have NT-S or NT-C-S kind of earthing system, so eventually weather we must use 4 or 5 wire in 400 volt level (For example 3×150+70 mm2 or 5×150 mm2) in this connection I would like to know exactly the paragraph of IEC or IEEE number

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why we use end termination xlpe cable on ht kit

1 Answers   Al Bario,

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what are the differenc between vcb and sf6 breakers

7 Answers   Google,

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i have to use generator in my project,which gen. i can use?

1 Answers  

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