Answer / v. senthilkumar - skpcl

Fully Automatic Star-Delta: In these starts Start-Delta
operation is an automatic one, which is accomplished with a
Timer fitted inside the starter. The time period from Star
to Delta can be adjusted between 7 to 15 sec. The Starter is
provided with Bimetallic Thermal Relay for protection
against Overloading & Single Phasing Conditions.

Semi-Automatic Star-Delta: These Starters are operated with
3-push button systems, in which the third push button
(Yellow) is used to change the motor running sequence from
Star to Delta. Bimetallic thermal overload Relay is fitted
in these starters for protection against overloading and
Single Phasing problems.

Answer / seimence

the difference between automatic & semi automatic starter
delta starters becouse the star delta starters are both use
in automatic & semi automatic condition so automatic
starters are work in automatic this not oparete manuali but
the semi automatic starters both are manuali & automatic
performe in ac machine.

Answer / prabhakar

Semi automatic starters will be opreated manouly which will
trip only on high voltage

fully atomatic starters will work with level
control ,timers and single phase priventers so it is fully
automatic

why we use taping of transformer on HT side?

4 Answers  

---

How we select the cable rating

1 Answers   BTM, Videocon,

---

what is the contact resistance of vacume circuit breaker??

1 Answers  

---

Three set (each phase contain 2 cable of 400 mmsq CU XLPE AWA) of single core cables are connected to 11 KV motor of 14 MW & the switch gear supplay is taken from 11kv feeder & this supplay taken from 275 KV substation. Problem is one pair cable(L3- 2 cable ) getting very hot & gland melted and damaged in switch gear side. the other two cable haven't any more hot(ambient temp only & L3 haveing 95- 100 Degree C. The same problem happened in 275 KV substation switch gear side also where the supply taken for 11 kv switch gear. But here L2 phese cable had problem. Why it is happening like this?. The cable having temperature different at different location from gland side inthe case of 11KV feeder of 275 kv substation. why ?

2 Answers  

---

why transformer rating comes in kva?

4 Answers   HNG, Tech Mahindra,

---

Why syn. Generators are used for the production of electricity?

0 Answers  

---

What is sunrise meeting ?

1 Answers   KSEB,

---

how to calculate the ct burden?

1 Answers   Hydropower,

---

can we run 3 phase induction motor under 2 phase supply

12 Answers  

---

how much current will take for 1kw power. and what is the eqoutiion which is connecting with kw and A.

2 Answers  

---

What is the Difference between Power Swing and Out of Step?

1 Answers  

---

On which side, taps are provided in tap changing transformers and why?

2 Answers  

---