What are the protections used in a HT breaker to protect
the HT motors.
- 2 Answers
- 20751 Views
- I also Faced
- E-Mail Answers
Answer Posted / sivaraman
We have to use for Motor Protection Relay (SPAM 150C)
1.Short Circuit
2.Excessive Start time
3.Thermal Overload
4.Locked Rotor during running/start up
5.Unbalance/loss of Phase/single phasing
6.Earth fault
7.Loss of Load
8.Temperature supervision of motor
9.Limitation of No. of Starts/Time between starts
All above facilities are available in this relay.
| Is This Answer Correct ? | 27 Yes | 2 No |
Post New Answer View All Answers
How Can I calculate for the photometrics requirements for a street lighting? Data given are: 45 units of 6 meter light pole with 150 watts metal halide lamp, 220 volts and installed in a promenade area.
Whats the difference btwn a latch, port,data bus buffer? Do they all not hold data in d flip flops??
How to calculate the multiplying factor for energy meter with ct ratio given
how define the torque in ac drive. from electrical side in the drive friquency ,voltage and current three factor is there.
What is the dependency of stiffness on load angle??
at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)
what is the eight bit unit?
I'm looking for a mnaual set for a Teradyne J750. Softcopy would be preferred but I'll take what I can get.
Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?
how to convert lv line to hv line and viseversa, any losses will occur during this process
WHAT HAPPENED DC SERIES MOTOR FIELD WINDING OPEN. CAN POSSIBLE.
wht is embedded systems? what is new inthis field?
do we use neutral grounding for resistive balanced load? if we use what happen?
can any one tell in easy method for circulating current ??
Whether should be the oil level in OCTC transfomer? It should be upto winding immersed completely or should be upto tap changer s/w? How it will affect the performance of the transformer. Rating may be 33KVA
