Answer / arun

Selection of CT for protection is majorly depends on the
burden limit and Kneepoint voltage at which the core of the
CT gets saturated,after which it cannot produce the
tripping emf in its core.

So check the burden of CT and kneepoint voltage.

Answer / ranga

because protection CTS are rated for high currents than the
metering CTS, so we should not use metering CTs for
protection purpose.

Answer / felixraj

the only diff is the knee point voltage
in metering CT this value is very low, because of this
during fault condition the ct get saturated and o/p almost zero
(metering equipments are protected from fault surge)

protection miss leads in metering CT (it may fails or
nuisance tripping)

Answer / mohammad

Metering and protection CTs have different accurecy class
level as metering CT has 1 class level and for protection
itis represented by 5P,10P etc..

Answer / mohsen khoshsefat

Introduction to Protection Transformers
Protective Current Transformers are designed to measure the
actual currents in power systems and to produce
proportional currents in their secondary windings which are
isolated from the main power circuit. These replica
currents are used as inputs to protective relays which will
automatically isolate part of a power circuit In the event
of an abnormal or fault condition therein, yet permit other
parts of the plant to continue in operation.

what is meant by VFD ?where its useful ?

7 Answers  

---

in HT service 3ph 4 wire service Y-phase voltage shows zero . whether it is meter fault? or what be the reason ? if y-ph voltage zero ,can current is recorded? reasons for failure?

0 Answers   apspdcl,

---

why the earth is taken minimum in supplying? wather it the proportional factor to getting work any equipment or a power plant?

0 Answers  

---

what happens if a carbon brush is touching the top end of the commutator

2 Answers  

---

how many testing is necessary for 27 MVA transformer?

1 Answers  

---

---

if a 3phase 100kva distribution transformer , 400 v,50 hz, 4-wire system is loaded at 160 k.w mostly 1-phase Lighting & Airconditioning split a.c load what will be the net effect on the power system in terms of voltage, powerfactor, current , efficiency of xformer

0 Answers  

---

wil a dc motor run without a starter??

9 Answers   MRF,

---

Recently we had experienced following problem All RCCB breakers (connected to the load as well as spares) connected to various UPS systems at various floors at a high rise building tripped during a power break down and upon starting up of generator.This Generator is recently inducted into the installation. Can any one explain the reason behind this tripping. Regards Viswanathan

1 Answers  

---

What is CCT (Correlated Color Temperature) ?

0 Answers  

---

how you configure motorvision relay (L&T make)from DCS

0 Answers   Ispat,

---

transmission line losses

1 Answers   SVS Constructions,

---

sir please send me previous year questions of jspl through which i could prepare myself fpr the test.

64 Answers   FGH, HFT, Jindal, Jindal Steel and Power, JSP, JSW, Lin Engineering,

---