Interested to Buy Any Domain ? << Click Here >> for more details...
what is difference between differential protection and
distance protection and how we calculate the sloop?
- 5 Answers
- 46101 Views
- OPS, Power Grid, I also Faced
- E-Mail Answers
Answer Posted / mohanraj
Differential protection is a unit protection, relay works
on the principle of Kirchoff's current Law.
Measuring element is Current Transformer.
The differential current measured between the incoming
current and Outgoing current must be negligible current
during stable and through fault condition. In case of
inzone fault or unstable condition (due to CT saturate)
relay will sense the differential current and issue the
trip signal.
Application: Transformer, Generator and Cable Protection.
**********************************************************
Distance protection is widely used in the transmission
network, its also called impedance protection because relay
operates with respect to fault impedance of the
transmission line. (Z=V/I)
Measuring element is Current Transformer and Voltage
Transformer.
Usually relay having 4 zones of the transmission line.
Zone1,Zone2,Zone3 will be forward zones (Towards the Line)
and zone 4 will be Reverse zone (Towards the Source).
| Is This Answer Correct ? | 51 Yes | 1 No |
Post New Answer View All Answers
Why is a plain induction motor unsuitable for wide speed control?
Explain the different regions in frequency response?
In the formula : Knee point voltage = Burden X alf / class, Please inform what is alf? regards Shashidhar M.R.
is it possible to say motor horsepower number without seeing name plate(when name plate damaged)
why the NGR (neutral grounding resistor) always OFF during DG off?
how to protect motor in dol starter having capacity of 30 hp.40 hp?
What is a copper loss or i2r loss pc?
In a flange coupling, the flange bolts are designed for
what is the transmission loss for electrical supply? specifically a large shopping complex where the grid is half KM away, what will the % of transmission loss? is there any transmission loss for captive unit generation for above set? thanks
what is a reactive power? what is the relation with power factor?
why the arc welding machines require parallel earthing systems? ie why each machines are connected to earth pit by separate wires during earthing? wats it adavantages?
What is oscillator circuit?
what is magnetizing and demagnetizing current in generator and motor?
How can calculate the earthing strip of Copper/GI for rating of 30kV,discharge current 10KA Lightning arrester.
How shall i select the value of capacitor or inductor in a system?
