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
- 46127 Views
- OPS, Power Grid, I also Faced
- E-Mail Answers
Answer Posted / raju t
Differential Protection:
1. It simultaneously compares the phaser difference & magnitude of the current entering & leaving the protected zone.
2. It works on kirchoff's current law
3. It is a unit protection scheme i.e. it needs current inputs from minimum two different sources.
4. Differential current = |I1+I2| --> Vector sum
5. It cannot be used to provide backup to other relays
6. %Slope = (Id2-Id1)/(Ib2-Ib1)
Distance Protection:
1. It calculates the apparent impedance of a line with the help of voltage & current input connected to the relay. If measured impedance falls below set impedance trip command is issued to clear the fault.
2. It works on impedance measuring principle
3. It is a non-unit protection but can be easily used as an unit protection by co-ordinating distance protection with PLCC
4. Z=V/I
5. It can be set to provide backup to adjoining lines & bus bar depending on the requirement.
| Is This Answer Correct ? | 30 Yes | 0 No |
Post New Answer View All Answers
i have faced a problem in ro plant grunfos make bm30type pump it is 22kw pump. We start this pump using siemens 3rw 4423-ibc44, 30kw softstarter but this soft starter will frequently failier so we planed to change dol starter. So pls tell anybudy its possible or not.
what will happen if multimeter(selector switch at DC voltage) and terminal at current is connected to DC supply?
is oil viscosity affect on motor current?
What shall be the secondary output voltage if the primary winding of a 220/6V, 50 Hz transformer is energized by an 110V, 60 Hz supply?
What kinds of decision are made about CT from it's Knee point(voltage & current)?
How to calculate loses in transformer of 160 KVA ?
132/66kv sub-station procation ?
Why are iron cores in transformers made laminated?
Define steady state error.
Why human body feel electric shock?
ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. The resistance of the armature is 0.4 ohms. Calculate the resistance required in series with the armature to reduce the speed to 600 rpm, assuming that the armature current is then 20A. [12]
How to decide cable tray size?
The advantages of Magnetic flux leakage technique over Ultrasonic technique for non distructive testing of material.
what happens if dc supply is given and the remedies for it.
details of oil cell size of Breakdown voltage test of tranformer oil details as per Standardswith mushroom electrodes?
