Answer / dhedhipya

First Understand this,
Rated current of fuse: It means that the current a fuse can
withstand for an indefinite period without any undue heating
or melting.
Rupture rating is also a similar term it is the capacity
fuse to withstand the damage due to arcs created.
HRC fuse is also called High Voltage Explosion Fuses.
HRC fuse is used in Large Power Houses. The common fusing
element is silver, copper and tin. These fuses surround the
fusible link with gas evolving substances, such as boric
acid and silicon dioxide(sand). Some special type fuses
surround one or more parallel connected fusible links. When
fuse blows, heat from arc causes boric acid to evolve large
volumes of gases. The associated high pressures and cooling
gases rapidly extinguish the resulting arc. The hot gases
are then explosively expelled out of the end.

what are the standard IR values should be of R-E, Y-E, B-E, R-Y, Y-B, B-R of VCB in closed condition and in open condition for 500KVA & 1000KVA transformers. and what is the acceptable range when tested by 5000V megger.

0 Answers   ME,

---

What is MS-EXCELL?

0 Answers   NTPC, Siemens,

---

What will happen if we parallel two transformer with different %impedace?

3 Answers  

---

Define ampere

0 Answers  

---

in case dc we mark as + ve & -ve..but in case a.c. we mark as ph&N...Y LIKE PLZ TELL ME

4 Answers   NPTC, TCS,

---

How to select the rating of the Transformer?

2 Answers  

---

what is th basic difference between a d latch time line and a d flip flop time line???

0 Answers  

---

when the diameter of the core and cable is doubled, the value of capacitance ?

2 Answers  

---

what effect will 10 milliampere current cause to human body

1 Answers   NPCIL,

---

In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes

0 Answers  

---

what happens when back feeding supply accidently collapses with normal supply ??? How?? [that is sometimes in a substation 11kv feeder if their ws long time permit work, back feeding supply will provide from nearest substation... if accidently after the permit work,they charged the feeder without removing back feeding wat will happen...?]

1 Answers   KSEB,

---

What are methods to avoid the inrush current at the time of starting of power transformer ?

8 Answers   Wipro,

---