Answer / sunil ulange

There are 2 types of CT's
1. Measuring purpose CT - Class 0.2, 0.1
2. protection Purpose CT- class PS, 5p10, 5P20

Class 0.2 - 0.2 Accurcy for meters.
Class PS- means Protection Purpose relays, breakers etc.
Class 5P10 - means 5% accuracy, P -protection, carry 10
times normal current

any Substation related questions ask me @ sunil_031@yahoo.com
Sunil Ulange
Project Engineer
Greenesol power Systems bangalore

Answer / ahamar

5P is a protection class of current transformer.CT,s are of
three types,for current measuring,for protection and
special protectin class.

Answer / amin

Explain the Term in CT Name Plate – Class: 0.2fs5
FS ?

for ac networks if the voltage wave form is V=Vm sinwt here the voltage Vm=230 for the frequency 50hz then the time period is 0.02 sec then for the time period 0.12 sec what is the voltage

4 Answers  

---

WHAT is the no of starts/hr for 3.3 KV, 300 KW motor. Motor is vertical flange type.

1 Answers   DAE, Siemens,

---

what is mean by NTPC?,why didn't electric shock in train?

7 Answers  

---

1. what is usage for power factor in industries?? 2.why we need to monitor power factor??

4 Answers   Havells,

---

Why indian power system in 11kv,22kv,33kv,66kv,110kv,220kv ? 2) Why ups required dedicated earth?

8 Answers   Energia, L&T, Sail,

---

---

Is it possible to import & export power through the same power transformer? what will be the vector group normally for both different or same?

1 Answers  

---

which frequency is to be selected for measuring earth resistivity

1 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

---

Electricity sometimes can be dangers , sometime got shoked form it . It is because of volatge or Current

6 Answers   Kirloskar,

---

Sir we have 12.5 MVA(110/11KV) transformer (Y-Y) connected,which tripped showing earth fault,when we charged transformer it stood OK ,but on connecting 11 KV feeders it tripped showing earth fault.our service engineers found that the B phase and R phase phase connecting to neutral broken from HV OLTC(on load tap changer),and R phase and Neutral is ok.Dissolved gas analysis shows that accetline content is high,tan delta value is 12.My dout is it is an internal fault of transformer,why REF or diffrential relay is not acted?

1 Answers  

---

what is phantom load, Give any example

2 Answers  

---

How to find HT side and LT side(of a transformer),with the help of a voltmeter?

1 Answers   Odisha Power Generation Corporation OPGC,

---

how does ELR works? explain

0 Answers  

---