Answer / kj

The hystersis is the difference between the voltage at
which the relay operates at and resets at.

For example the UVR is set to open the contacts at 200
volts and it can be set to close at 211.5 volts (for 230
volt sensing). This would be 5% hystersis setting.

This is to stop the relay switching on and off continuously
when the voltage is around 200 volts.

Answer / k.prakashchandra

It should have given in the manual supplied with the
relay.It seems that it is the setting for % drop in
voltage.It is important to set the time delay also.The delay
should not be less than the time taken by any CB of the
power supply system, to clear the fault to prevent tripping
on under voltage due to temporary fault anywhere in the
supply network

what is Anti-pumping?

0 Answers  

---

what is softstarter? explain briefly where it is used?

2 Answers   Essar,

---

How to see the inductance in a transmission lines

0 Answers  

---

what types of cable used in underground coal mining?

0 Answers  

---

Why 50hz and 60hz frequencies are used by the world, why they are not taking 55hz?

3 Answers  

---

In Extended Delta transformer, by which method we can measure the extended angle of transformer?

1 Answers   Usha Martin,

---

i want to know how to determine that a surge arrester work properly in 11kv system. and how to test a 12kv surge arrester

0 Answers  

---

What is PTZ Camera???

3 Answers   Cherrytec, CSC, Honeywell, Zicom,

---

Why the substation measure in KV but not in the power ratings of transformer.

4 Answers  

---

In an alternator running with a balanced zero p.f. lagging load, phase differernc between the resultant armature flux and main field flux is always____? options is 180 degree....why?? explain.

1 Answers   BREB,

---

why do we use 25kv supply for traction purpose

1 Answers  

---

in magnetic field we send current to generate flux,why not voltage?

2 Answers  

---