Answer / devendra chaturvedi

if we gave transformer 5 hz instead of 50/60 hz at constant i/p voltage than B(max.flux density) increases t a very high value which saturates the core,increases the core losses to a very high value which may damage the core and transformer

Answer / 7anoter4

Since V=K*B*frq [V= primary supply voltage -approx.
equal to E-emf]; B=magnetic flux density ; frq=frequency]
then if frq=5 Hz and V=constant B[5Hz]=10*B[50 Hz].The no-
load[excitation] current will be more than 300% rated
current.

You have to reduce the voltage to 10% from rated at 50 Hz
in order to get the same B.

What is LCI drive & how does it work & why it is used?

1 Answers   EIS, ONGC,

---

what is the purpose of vector group in a transformer ? if 2 tranaformers r connected in parallel the vector group is same or not? for parallel operation 2 transformers of different manufacturers maintain same vector group or not?

3 Answers   Orchid,

---

which is chemical used as in ro water what is difference betweeen multi grade filter&dual media filter

0 Answers   Dalkia,

---

For testing 33kv cable hipot testing. How much kv we have to Apply .Give in details.

24 Answers  

---

how many earthing should need for UPS, where its connected

7 Answers   HCL,

---

Difference Between Differential Relay and Restricted Earth Fault Relay of Power Transformers

1 Answers   KSEB,

---

how to test YNyn0 vector group in transformer?

0 Answers  

---

How to work definite,over pluxing,revers power,OSR relay

0 Answers   Ford,

---

In case of delta/delta transformer if the one phase is blown out then what will be secondary line voltage ?

4 Answers  

---

What percentage netural current is in netural depend upon the phase current

1 Answers  

---

What are safety seals?

1 Answers   HSL,

---

How to select the rating of a CT used for REF protection. The rating can be of equal rating of Phase current or neutral current rating

2 Answers   UltraTech,

---