Answer / pillay

DOL starter means a Direct On Line starter, where the AC
supply is directly applied across the motor terminals
whenever it is used unlike some bigger motors where the
power supply goes through a starting system to enable a
smoother start or a reduced current start.Some examples are
star delta ,auto transformer starter ,rotor resistance
starter, soft starter etc.

whether a separate starter is used for a motor while it is connected to a vvvf panel?

2 Answers  

---

One VFD is possible to connect two motors at the same time?

2 Answers  

---

Why Humming noise originated in Starter motor and how it was generated ?

3 Answers  

---

what is differnce between grounding and earthing or both are same?

3 Answers  

---

HOW DO YOU PROVE THE HIGH VOLTAGE CABLES OR BUSBAR IS DEAD EVEN AFTER IT IS DE ENERGISED

6 Answers  

---

why it is unable to birds to be on a 220kV 0r 132 kv lines like on 33kV and 11kV lines?

4 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

---

advantages of vvvf drives over non vvvf drives for EOT cranes

2 Answers   HEC,

---

what is demagnetising effect & crossmagnetising effect and how it is related to electrical system?is there any more effects are available or only these two??

1 Answers   Telco,

---

In a three-phase full converter, every SCR conducts for a.60deg. b. 120deg. C.180deg. d.90deg

3 Answers  

---

why actual valve timing diagram is different than ideal valve timing digram of a 4 stroke engine?

0 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  

---

how the transmission voltage ranges are decided like 11kV,33kV,66kV,132kV,220kV,400kV,725kV.... why not choose the transmission line voltage as 23kV,164kV,440kV?? what's the reason??

3 Answers  

---