Answer / khrabsheh

Sensitive Earth Fault Protection Normally used on systems where the earth fault current is limited to a very low value (Neutral earthed through resistors, Peterson coil, reactance, etc) Scheme consists out of a ring CT (Core Balance CT) around the three phase conductors, and the relay connected to the secondary side of the CT. A very low setting is possible, even sometimes lower then 1% FLA. Need to coordinate with similar relays downstream.

What are chief characteristics of state-space method and its techniques ?

0 Answers   Limton,

---

explain LED lamps?

1 Answers  

---

how we select the mva rating of the circuit breakers?

1 Answers  

---

How to test Power Transfomer vector group in the field?

3 Answers   Al-Yamama,

---

why Current is lead 90 degree and voltage is lag 90 degree in a capacitor.? why Current is lag 90 degree and voltage is lead 90 degree in an inductor.?

0 Answers  

---

For a 50MVA (138/69/13.8 KV) transformer, what would be the maximum demand in order not to exceed 80% of its operating capacity.

2 Answers  

---

What is maximum demand and contract demand?

5 Answers  

---

Megger type of instrument is used to check??

8 Answers  

---

what is the difference b/w circuit breakers and relays?

3 Answers  

---

what is the meaning of ceiling voltage in Generator exciter?

1 Answers  

---

what s the differenc between electrical &electronis , how to define them

9 Answers  

---

sometime battery charged and then automatically charged when rectifier ON conition, is there any chances please clarify the same.

0 Answers  

---