Answer / rajen thakkar

Hipot test is used to test the cable for Its more than
rated voltage level for which it is designed.so, for 11KV
cable 19KV DC is applied for 1 Minute to R&Y,Y&B,B&R lead
of cable one by one & armoring is connected to earth. 11KV
Cable should withstand this voltage.If cable insulation is
weak so it will breakdown at this higher votage
level.Before & After the Hipot test cable meggering should
be done By 5Kv Megger.

Answer / prabhu krishna

hipot test is used to test the cable for Its more than
rated voltage level for which it is designed.so, for 11KV
cable 19KV DC is applied for 1 Minute to R&Y,Y&B,B&R lead
of cable one by one & armoring is connected to earth. 11KV
Cable should withstand this voltage.If cable insulation is
weak so it will breakdown at this higher votage
level.Before & After the Hipot test cable meggering should
be done By 5Kv Megger.

what is meant by switch fuse unit ?

3 Answers   Thermal Powertech Corporation India Ltd TPCIL,

---

why we measure ouput of transformers in kva.

1 Answers  

---

is the value of inductance depends upon the evalue of thitha in doubly excited machine?

0 Answers  

---

How does the phase sequence controller works, how it identifies the phases? confirm working principle

0 Answers  

---

does the power factor of an induction motor improve upon used in parallel with a synchronous condenser , used commonly to provide a leading kva ?

1 Answers  

---

---

what is the difference between brushed alternator ,brushless alternator & permanent alternator ?

1 Answers  

---

what is the working principle of soft-starter & how it diff. from VFD ?????????

5 Answers   L&T,

---

What is the difference between Earthing and Neutral?

13 Answers  

---

WHEN SINGLE PHASE SUPPLY AS 220V, WHY THE 3 PHASE- 4 WIRE MEASURED AS 440 VOLTS INSTEAD OF 660 VOLTS (220 VOLTS PER PHASE i.e 220x3 = 660 volts ).

1 Answers  

---

1)Why potential transformer primary site grounded? 2)can be loop between neutral & body for grounding? 3)What is the difference between ELCB &RCCB? 4)Why we use iron core in transformer insted of wooden core? 5)what is the principle of excitation? 6)Why we test the core balance test for transformer? 7)what is creepage?What is the creepage length for insulators at different voltages? 8)How much type of relays used for differential protection of generator,transformer & busbar protection?

5 Answers  

---

Advantage of earthing transformer

2 Answers   EID Parry,

---

How to calculate u.p.s load parsentage plz give me formula

1 Answers  

---